diff --git a/CMakeLists.txt b/CMakeLists.txt index c7d4c52de..e7e281941 100644 --- a/CMakeLists.txt +++ b/CMakeLists.txt @@ -605,7 +605,9 @@ set(HDR_PRIVATE set(HDR_PUBLIC "${PROJECT_SOURCE_DIR}/lib/libwebsockets.h" - "${PROJECT_BINARY_DIR}/lws_config.h") + "${PROJECT_BINARY_DIR}/lws_config.h" + "${PROJECT_SOURCE_DIR}/plugins/ssh-base/include/lws-plugin-ssh.h" + ) set(SOURCES lib/base64-decode.c @@ -1153,6 +1155,8 @@ set(CMAKE_REQUIRED_LIBRARIES ${LIB_LIST}) CHECK_FUNCTION_EXISTS(SSL_CTX_set1_param LWS_HAVE_SSL_CTX_set1_param) CHECK_FUNCTION_EXISTS(SSL_set_info_callback LWS_HAVE_SSL_SET_INFO_CALLBACK) CHECK_FUNCTION_EXISTS(X509_VERIFY_PARAM_set1_host LWS_HAVE_X509_VERIFY_PARAM_set1_host) +CHECK_FUNCTION_EXISTS(RSA_set0_key LWS_HAVE_RSA_SET0_KEY) + if (LWS_USE_MBEDTLS) set(LWS_HAVE_TLS_CLIENT_METHOD 1) if (NOT LWS_WITH_ESP32) @@ -1363,6 +1367,18 @@ if (NOT LWS_WITHOUT_TESTAPPS) "" "" "") + + if (LWS_WITH_CGI) + create_test_app(test-sshd "test-apps/test-sshd.c" + "" + "" + "" + "" + "") + target_include_directories(test-sshd PRIVATE "${PROJECT_SOURCE_DIR}/plugins/ssh-base/include") + + endif() + if (UNIX) create_test_app(test-fuzxy "test-apps/fuzxy.c" "" @@ -1508,7 +1524,7 @@ if (NOT LWS_WITHOUT_TESTAPPS) if (LWS_WITH_PLUGINS AND LWS_WITH_SHARED) - macro(create_plugin PLUGIN_NAME MAIN_SRC S2 S3) + macro(create_plugin PLUGIN_NAME PLUGIN_INCLUDE MAIN_SRC S2 S3) set(PLUGIN_SRCS ${MAIN_SRC}) @@ -1540,6 +1556,7 @@ if (NOT LWS_WITHOUT_TESTAPPS) target_link_libraries(${PLUGIN_NAME} websockets_shared) add_dependencies(${PLUGIN_NAME} websockets_shared) + include_directories(${PLUGIN_INCLUDE}) # Set test app specific defines. set_property(TARGET ${PLUGIN_NAME} @@ -1556,35 +1573,42 @@ if (NOT LWS_WITHOUT_TESTAPPS) endmacro() - create_plugin(protocol_lws_meta + create_plugin(protocol_lws_meta "" "plugins/protocol_lws_meta.c" "" "") - create_plugin(protocol_dumb_increment + create_plugin(protocol_dumb_increment "" "plugins/protocol_dumb_increment.c" "" "") - create_plugin(protocol_lws_mirror + create_plugin(protocol_lws_mirror "" "plugins/protocol_lws_mirror.c" "" "") - create_plugin(protocol_lws_status + create_plugin(protocol_lws_status "" "plugins/protocol_lws_status.c" "" "") - create_plugin(protocol_post_demo + create_plugin(protocol_post_demo "" "plugins/protocol_post_demo.c" "" "") - create_plugin(protocol_lws_table_dirlisting + create_plugin(protocol_lws_table_dirlisting "" "plugins/generic-table/protocol_table_dirlisting.c" "" "") + create_plugin(protocol_lws_ssh_base "plugins/ssh-base/include" + "plugins/ssh-base/sshd.c;plugins/ssh-base/telnet.c;plugins/ssh-base/kex-25519.c" "plugins/ssh-base/crypto/chacha.c;plugins/ssh-base/crypto/ed25519.c;plugins/ssh-base/crypto/fe25519.c;plugins/ssh-base/crypto/ge25519.c;plugins/ssh-base/crypto/poly1305.c;plugins/ssh-base/crypto/sc25519.c;plugins/ssh-base/crypto/smult_curve25519_ref.c" "") + create_plugin(protocol_lws_sshd_demo "plugins/ssh-base/include" "plugins/protocol_lws_sshd_demo.c" "" "") + + + include_directories("${PROJECT_SOURCE_DIR}/plugins/ssh-base/include") + if (NOT WIN32) - create_plugin(protocol_lws_raw_test + create_plugin(protocol_lws_raw_test "" "plugins/protocol_lws_raw_test.c" "" "") endif() if (LWS_WITH_SERVER_STATUS) - create_plugin(protocol_lws_server_status + create_plugin(protocol_lws_server_status "" "plugins/protocol_lws_server_status.c" "" "") endif() if (NOT LWS_WITHOUT_CLIENT) - create_plugin(protocol_client_loopback_test + create_plugin(protocol_client_loopback_test "" "plugins/protocol_client_loopback_test.c" "" "") endif(NOT LWS_WITHOUT_CLIENT) if (LWS_WITH_GENERIC_SESSIONS) - create_plugin(protocol_generic_sessions + create_plugin(protocol_generic_sessions "" "plugins/generic-sessions/protocol_generic_sessions.c" "plugins/generic-sessions/utils.c" "plugins/generic-sessions/handlers.c") @@ -1595,7 +1619,7 @@ if (LWS_WITH_GENERIC_SESSIONS) target_link_libraries(protocol_generic_sessions sqlite3 ) endif(WIN32) - create_plugin(protocol_lws_messageboard + create_plugin(protocol_lws_messageboard "" "plugins/generic-sessions/protocol_lws_messageboard.c" "" "") if (WIN32) target_link_libraries(protocol_lws_messageboard ${LWS_SQLITE3_LIBRARIES}) @@ -1802,6 +1826,10 @@ if (LWS_WITH_CGI) endif() endif() +install(FILES test-apps/lws-ssh-test-keys;test-apps/lws-ssh-test-keys.pub + DESTINATION share/libwebsockets-test-server + COMPONENT examples) + # plugins if (LWS_WITH_PLUGINS) @@ -1907,6 +1935,7 @@ message(" LWS_MAX_SMP = ${LWS_MAX_SMP}") message(" LWS_WITH_CGI = ${LWS_WITH_CGI}") message(" LWS_HAVE_OPENSSL_ECDH_H = ${LWS_HAVE_OPENSSL_ECDH_H}") message(" LWS_HAVE_SSL_CTX_set1_param = ${LWS_HAVE_SSL_CTX_set1_param}") +message(" LWS_HAVE_RSA_SET0_KEY = ${LWS_HAVE_RSA_SET0_KEY}") message(" LWS_WITH_HTTP_PROXY = ${LWS_WITH_HTTP_PROXY}") message(" LIBHUBBUB_LIBRARIES = ${LIBHUBBUB_LIBRARIES}") message(" PLUGINS = ${PLUGINS_LIST}") diff --git a/READMEs/README-plugin-sshd-base.md b/READMEs/README-plugin-sshd-base.md new file mode 100644 index 000000000..65d67f827 --- /dev/null +++ b/READMEs/README-plugin-sshd-base.md @@ -0,0 +1,250 @@ +ssh-base Plugin +================ + +## Introduction + +lws-ssh-base is a protcol plugin for libwebsockets that implements a +generic, abstract, ssh server. + + - very small footprint in code and memory, takes up small part of ESP32 + + - written with security in mind: valgrind and Coverity -clean + + - binds to one or more vhosts, that controls listen port(s) + + - all IO and settings abstracted through a single "ops" struct from user code + + - each instance on a vhost has its own "ops" struct, defining server keys, + auth method and functions to implement IO and other operations + + - The plugin has no built-in behaviours like check ~/.ssh/authorized_keys, + treat auth usernames as system usernames, or spawn the user's shell. + Everything potentially dangerous is left to the user ops code to decide + how to handle. It's NOT like sshd where running it implies it will accept + existing keys for any system user, will spawn a shell, etc, unless you + implement those parts in the ops callbacks. + + - The plugin requires extra code around it in the form of the ops struct + handlers. So it's role is something like an abstract base class for an ssh + server. All the crypto, protocol sequencing and state machine are inside, + but all the IO except the network connection is outside. + + - Built as part of libwebsockets, like all plugins may be dynamically loaded + at runtime or built statically. Test app `libwebsockets-test-sshd` provided + + - Uses hash and RSA functions from either mbedTLS or OpenSSL automatically, + according to which library libwebsockets was built for + +To maintain its small size, it implements a single "best of breed" crypto for +the following functions: + +|Function|Crypto| +|---|---| +|KEX|curve25519-sha256@libssh.org| +|Server host key|ssh-rsa (4096b)| +|Encryption|chacha20-poly1305@openssh.com| +|Compression|None| + +## License + +lws-ssh-base is Free Software, available under libwebsocket's LGPLv2 + +static linking exception license. + +The crypto parts are available elsewhere under a BSD license. But for +simplicity the whole plugin is under LGPLv2. + +## Generating your own keys + +``` + $ ssh-keygen -t rsa -b 4096 -f mykeys +``` + +will ask for a passphrase and generate the private key in `mykeys` and the +public key in `mykeys.pub`. If you already have a suitable RSA key you use +with ssh, you can just use that directly. + +lws installs a test keypair in /usr[/local]/share/libwebsockets-test-server +that the test apps will accept. + +## Example code + +1) There's a working example app `libwebsockets-test-sshd` included that +spawns a bash shell when an ssh client authenticates. The username used on +the remote ssh has no meaning, it spawns the shell under the credentials of +"lws-test-sshd" was run under. It accepts the lws ssh test key which is +installed into /usr[/local]/share/libwebsockets-test-server. + +Start the server like this (it wants root only because the server key is stored +in /etc) + +``` + $ sudo libwebsockets-test-sshd +``` + +Connect to it using the test private key like this + +``` + $ ssh -p 2200 -i /usr/local/share/libwebsockets-test-server/lws-ssh-test-keys anyuser@127.0.0.1 +``` + +2) There's also a working example plugin `lws-sshd-demo` that "subclasses" the +abstract `lws-ssh-base` plugin to make a protocol which can be used from, +eg, lwsws. For an lwsws vhost that listens on port 2222 and responds with +the lws-sshd-demo ssh server, the related config is: + +``` + { + "name": "sshd", + "port": "2222", + "onlyraw": "1", + "ws-protocols": [{ + "lws-ssh-base": { + "status": "ok", + "ops-from": "lws-sshd-demo" + }, + "lws-sshd-demo": { + "status": "ok", + "raw": "1" + } + }] + } +``` + + + +## Integration to other apps + +### Step 0: Build and install libwebsockets + +For the `libwebsockets-test-sshd` example, you will need CMake options +`LWS_WITH_CGI`, since it uses lws helpers to spawn a shell. + +lws-ssh-base itself doesn't require CGI support in libwebsockets. + +### Step 1: make the code available in your app + +Include `lws-plugin-ssh-base` in your app, either as a runtime plugin or by using +the lws static include scheme. + +To bring in the whole of the ssh-base plugin +into your app in one step, statically, just include +`plugins/ssh-base/include/lws-plugin-sshd-static-build-includes.h`, you can see +an example of this in `./test-apps/test-sshd.c`. + +### Step 2: define your `struct lws_ssh_ops` + +`plugins/ssh-base/include/lws-plugin-ssh.h` defines +`struct lws_ssh_ops` which is used for all customization and integration +of the plugin per vhost. Eg, + +``` +static const struct lws_ssh_ops ssh_ops = { + .channel_create = ssh_ops_channel_create, + .channel_destroy = ssh_ops_channel_destroy, + .tx_waiting = ssh_ops_tx_waiting, + .tx = ssh_ops_tx, + .rx = ssh_ops_rx, + .get_server_key = ssh_ops_get_server_key, + .set_server_key = ssh_ops_set_server_key, + .set_env = ssh_ops_set_env, + .pty_req = ssh_ops_pty_req, + .child_process_io = ssh_ops_child_process_io, + .child_process_terminated = ssh_ops_child_process_terminated, + .exec = ssh_ops_exec, + .shell = ssh_ops_shell, + .is_pubkey_authorized = ssh_ops_is_pubkey_authorized, + .banner = ssh_ops_banner, + .disconnect_reason = ssh_ops_disconnect_reason, + .server_string = "SSH-2.0-Libwebsockets", + .api_version = 1, +}; +``` +The `ssh_ops_...()` functions are your implementations for the operations +needed by the plugin for your purposes. + +### Step 3: enable `lws-ssh-base` protocol to a vhost and configure using pvo + +A pointer to your struct lws_ssh_ops is passed into the vhost instance of the +protocol using per-vhost options + +``` +static const struct lws_protocol_vhost_options pvo_ssh_ops = { + NULL, + NULL, + "ops", + (void *)&ssh_ops +}; + +static const struct lws_protocol_vhost_options pvo_ssh = { + NULL, + &pvo_ssh_ops, + "lws-sshd-base", + "" /* ignored, just matches the protocol name above */ +}; + +... + info.port = 22; + info.options = LWS_SERVER_OPTION_ONLY_RAW; + info.vhost_name = "sshd"; + info.protocols = protocols_sshd; + info.pvo = &pvo_ssh; + + vh_sshd = lws_create_vhost(context, &info); +``` + +There are two possible pvos supported, "ops", shown above, directly passes the +ops structure in using the value on the "ops" pvo. + +To support other protocols that want to provide ops to lws-ssh-base themselves +for a particular vhost, you can also provide a pvo `"ops-from"` whose value is +the name of the protocol also enabled on this vhost, whose protocol ".user" +pointer points to the ops struct lws-ssh-base should use. + +## Integration to other plugins + +A worked example of using the abstract `lws-ssh-base` plugin from another +plugin that provides the ops struct is in `./plugins/protocol_lws_sshd_demo`. + +The key points to note + + - the plugin sets the ops struct for the vhost instantiation of `lws-ssh-base` + by passing a pointer to the ops struct in its `lws_protocols` struct `user` + member. + + - the config for the vhost tells `lws-ssh-base` to pick up the ops struct + pointer using an "ops-from" pvo that indicates the protocol name. + +``` + "lws-ssh-base": { + "status": "ok", + "ops-from": "lws-sshd-demo" + }, +``` + + - the config for the vhost tells lws this vhost only serves RAW (ie, no http) + +``` + { + "name": "sshd", + "port": "2222", + "onlyraw": "1", + ... +``` + + - the config for the vhost marks the protocol that uses `lws-ssh-base`, not + `lws-ssh-base` itself, as the protocol to be served for raw connections + +``` + "lws-sshd-demo": { + "status": "ok", + "raw": "1" + ... +``` + +## Notes + +You can have the vhost it binds to listen on a nonstandard port. The ssh +commandline app cane be told to connect to a non-22 port with +`ssh -p portnum user@hostname` + + diff --git a/READMEs/README.lwsws.md b/READMEs/README.lwsws.md index df0a8788a..33f7f721d 100644 --- a/READMEs/README.lwsws.md +++ b/READMEs/README.lwsws.md @@ -196,6 +196,18 @@ by the client, you can use "default": "1" }] ``` +Similarly, if your vhost is serving a raw protocol, you can mark the protocol +to be selected using "raw": "1" +``` + "ws-protocols": [{ + "warmcat-timezoom": { + "status": "ok", + "raw": "1" + } + }] +``` + +See also "rawonly" below. @section lwswsovo Lwsws Other vhost options @@ -257,6 +269,8 @@ recommended vhost headers for good client security are ``` + - "`rawonly`": "on" This vhost only serves a raw protocol, disable HTTP on it + @section lwswsm Lwsws Mounts Where mounts are given in the vhost definition, then directory contents may @@ -590,7 +604,7 @@ this will give nice backtraces in lwsws itself and in plugins, if they were buil @section lwswsvgd Running lwsws under valgrind -You can just run lwsws under galgrind as usual and get valid results. However the results / analysis part of valgrind runs +You can just run lwsws under valgrind as usual and get valid results. However the results / analysis part of valgrind runs after the plugins have removed themselves, this means valgrind backtraces into plugin code is opaque, without source-level info because the dynamic library is gone. diff --git a/cmake/lws_config.h.in b/cmake/lws_config.h.in index 3f2488abc..851bc3889 100644 --- a/cmake/lws_config.h.in +++ b/cmake/lws_config.h.in @@ -92,6 +92,7 @@ #cmakedefine LWS_SSL_SERVER_WITH_ECDH_CERT #cmakedefine LWS_HAVE_SSL_CTX_set1_param #cmakedefine LWS_HAVE_X509_VERIFY_PARAM_set1_host +#cmakedefine LWS_HAVE_RSA_SET0_KEY #cmakedefine LWS_HAVE_UV_VERSION_H diff --git a/lib/context.c b/lib/context.c index 9c0073a1d..419567699 100644 --- a/lib/context.c +++ b/lib/context.c @@ -482,6 +482,9 @@ lws_create_vhost(struct lws_context *context, else vh->name = info->vhost_name; + if (info->options & LWS_SERVER_OPTION_ONLY_RAW) + lwsl_info("%s set to only support RAW\n", vh->name); + vh->iface = info->iface; #if !defined(LWS_WITH_ESP8266) && !defined(LWS_WITH_ESP32) && !defined(OPTEE_TA) && !defined(WIN32) vh->bind_iface = info->bind_iface; diff --git a/lib/lejp-conf.c b/lib/lejp-conf.c index 3a1586dee..185e663b3 100644 --- a/lib/lejp-conf.c +++ b/lib/lejp-conf.c @@ -99,6 +99,7 @@ static const char * const paths_vhosts[] = { "vhosts[].client-ssl-cert", "vhosts[].client-ssl-ca", "vhosts[].client-ssl-ciphers", + "vhosts[].onlyraw", }; enum lejp_vhost_paths { @@ -145,6 +146,7 @@ enum lejp_vhost_paths { LEJPVP_CLIENT_SSL_CERT, LEJPVP_CLIENT_SSL_CA, LEJPVP_CLIENT_CIPHERS, + LEJPVP_FLAG_ONLYRAW, }; static const char * const parser_errs[] = { @@ -356,7 +358,7 @@ lejp_vhosts_cb(struct lejp_ctx *ctx, char reason) a->info->keepalive_timeout = 5; a->info->log_filepath = NULL; a->info->options &= ~(LWS_SERVER_OPTION_UNIX_SOCK | - LWS_SERVER_OPTION_STS); + LWS_SERVER_OPTION_STS | LWS_SERVER_OPTION_ONLY_RAW); a->enable_client_ssl = 0; } @@ -666,6 +668,13 @@ lejp_vhosts_cb(struct lejp_ctx *ctx, char reason) a->info->options &= ~(LWS_SERVER_OPTION_DISABLE_IPV6); return 0; + case LEJPVP_FLAG_ONLYRAW: + if (arg_to_bool(ctx->buf)) + a->info->options |= LWS_SERVER_OPTION_ONLY_RAW; + else + a->info->options &= ~(LWS_SERVER_OPTION_ONLY_RAW); + return 0; + case LEJPVP_IPV6ONLY: a->info->options |= LWS_SERVER_OPTION_IPV6_V6ONLY_MODIFY; if (arg_to_bool(ctx->buf)) diff --git a/lib/libwebsockets.c b/lib/libwebsockets.c index 7c7b3aadd..60d0bbc0f 100755 --- a/lib/libwebsockets.c +++ b/lib/libwebsockets.c @@ -90,6 +90,9 @@ lws_free_wsi(struct lws *wsi) lws_header_table_force_to_detachable_state(wsi); lws_header_table_detach(wsi, 0); + if (wsi->vhost->lserv_wsi == wsi) + wsi->vhost->lserv_wsi = NULL; + lws_pt_lock(pt); for (n = 0; n < wsi->context->max_http_header_pool; n++) { if (pt->ah_pool[n].in_use && @@ -1520,8 +1523,6 @@ lws_get_reserved_bits(struct lws *wsi) int lws_ensure_user_space(struct lws *wsi) { - lwsl_debug("%s: %p protocol %p\n", __func__, wsi, wsi->protocol); - if (!wsi->protocol) return 1; @@ -1540,6 +1541,18 @@ lws_ensure_user_space(struct lws *wsi) return 0; } +LWS_VISIBLE void * +lws_adjust_protocol_psds(struct lws *wsi, size_t new_size) +{ + ((struct lws_protocols *)lws_get_protocol(wsi))->per_session_data_size = + new_size; + + if (lws_ensure_user_space(wsi)) + return NULL; + + return wsi->user_space; +} + LWS_VISIBLE int lwsl_timestamp(int level, char *p, int len) { @@ -3975,7 +3988,6 @@ lws_ring_consume(struct lws_ring *ring, uint32_t *tail, void *dest, return n / ring->element_len; } - if (*tail + n > ring->buflen) { /* @@ -4003,6 +4015,18 @@ lws_ring_consume(struct lws_ring *ring, uint32_t *tail, void *dest, return (((uint8_t *)dest + n) - odest) / ring->element_len; } +LWS_VISIBLE LWS_EXTERN const void * +lws_ring_get_element(struct lws_ring *ring, uint32_t *tail) +{ + if (!tail) + tail = &ring->oldest_tail; + + if (*tail == ring->head) + return NULL; + + return ((uint8_t *)ring->buf) + *tail; +} + LWS_VISIBLE LWS_EXTERN void lws_ring_update_oldest_tail(struct lws_ring *ring, uint32_t tail) { diff --git a/lib/libwebsockets.h b/lib/libwebsockets.h index 0d0141820..6efa7457f 100644 --- a/lib/libwebsockets.h +++ b/lib/libwebsockets.h @@ -1845,6 +1845,23 @@ lws_protocol_vh_priv_zalloc(struct lws_vhost *vhost, const struct lws_protocols LWS_VISIBLE LWS_EXTERN void * lws_protocol_vh_priv_get(struct lws_vhost *vhost, const struct lws_protocols *prot); +/** + * lws_adjust_protocol_psds - change a vhost protocol's per session data size + * + * \param wsi: a connection with the protocol to change + * \param new_size: the new size of the per session data size for the protocol + * + * Returns user_space for the wsi, after allocating + * + * This should not be used except to initalize a vhost protocol's per session + * data size one time, before any connections are accepted. + * + * Sometimes the protocol wraps another protocol and needs to discover and set + * its per session data size at runtime. + */ +LWS_VISIBLE LWS_EXTERN void * +lws_adjust_protocol_psds(struct lws *wsi, size_t new_size); + /** * lws_finalize_startup() - drop initial process privileges * @@ -4743,18 +4760,44 @@ lws_ring_insert(struct lws_ring *ring, const void *src, size_t max_count); * * \param ring: the struct lws_ring to report on * \param tail: a pointer to the tail struct to use, or NULL for single tail - * \param dest: the array of elements to be inserted + * \param dest: the array of elements to be inserted. or NULL for no copy * \param max_count: the number of available elements at src * * Attempts to copy out as many waiting elements as possible into dest, from - * the perspective of the given tail, up to max_count. + * the perspective of the given tail, up to max_count. If dest is NULL, the + * copying out is not done but the elements are logically consumed as usual. + * NULL dest is useful in combination with lws_ring_get_element(), where you + * can use the element direct from the ringbuffer and then call this with NULL + * dest to logically consume it. * - * Returns the number of elements copied out. + * Increments the tail position according to how many elements could be + * consumed. + * + * Returns the number of elements consumed. */ LWS_VISIBLE LWS_EXTERN size_t lws_ring_consume(struct lws_ring *ring, uint32_t *tail, void *dest, size_t max_count); +/** + * lws_ring_get_element(): get a pointer to the next waiting element for tail + * + * \param ring: the struct lws_ring to report on + * \param tail: a pointer to the tail struct to use, or NULL for single tail + * + * Points to the next element that tail would consume, directly in the + * ringbuffer. This lets you write() or otherwise use the element without + * having to copy it out somewhere first. + * + * After calling this, you must call lws_ring_consume(ring, &tail, NULL, 1) + * which will logically consume the element you used up and increment your + * tail (tail may also be NULL there if you use a single tail). + * + * Returns NULL if no waiting element, or a const void * pointing to it. + */ +LWS_VISIBLE LWS_EXTERN const void * +lws_ring_get_element(struct lws_ring *ring, uint32_t *tail); + /** * lws_ring_update_oldest_tail(): free up elements older than tail for reuse * diff --git a/lib/server.c b/lib/server.c index 256574ac9..9a0fbb5fe 100644 --- a/lib/server.c +++ b/lib/server.c @@ -2817,6 +2817,8 @@ try_pollout: if (!(wsi->vhost->options & LWS_SERVER_OPTION_ONLY_RAW)) opts |= LWS_ADOPT_HTTP; + else + opts = LWS_ADOPT_SOCKET; fd.sockfd = accept_fd; if (!lws_adopt_descriptor_vhost(wsi->vhost, opts, fd, diff --git a/lib/ssl-client.c b/lib/ssl-client.c index 0b7f24d2f..be96a0e5d 100644 --- a/lib/ssl-client.c +++ b/lib/ssl-client.c @@ -443,6 +443,9 @@ int lws_context_init_client_ssl(struct lws_context_creation_info *info, const char *cert_filepath = info->ssl_cert_filepath; int n; + if (vhost->options & LWS_SERVER_OPTION_ONLY_RAW) + return 0; + /* * for backwards-compatibility default to using ssl_... members, but * if the newer client-specific ones are given, use those diff --git a/plugins/protocol_lws_sshd_demo.c b/plugins/protocol_lws_sshd_demo.c new file mode 100644 index 000000000..db8164ac8 --- /dev/null +++ b/plugins/protocol_lws_sshd_demo.c @@ -0,0 +1,473 @@ +/* + * ws protocol handler plugin for sshd demo + * + * Copyright (C) 2010-2017 Andy Green + * + * This file is made available under the Creative Commons CC0 1.0 + * Universal Public Domain Dedication. + * + * The person who associated a work with this deed has dedicated + * the work to the public domain by waiving all of his or her rights + * to the work worldwide under copyright law, including all related + * and neighboring rights, to the extent allowed by law. You can copy, + * modify, distribute and perform the work, even for commercial purposes, + * all without asking permission. + * + * These test plugins are intended to be adapted for use in your code, which + * may be proprietary. So unlike the library itself, they are licensed + * Public Domain. + */ + +#if !defined (LWS_PLUGIN_STATIC) +#define LWS_DLL +#define LWS_INTERNAL +#include "../lib/libwebsockets.h" +#endif + +#include + +#include + +#define TEST_SERVER_KEY_PATH "/etc/lws-test-sshd-server-key" + +struct per_vhost_data__lws_sshd_demo { + const struct lws_protocols *ssh_base_protocol; + int privileged_fd; +}; + +/* + * This is a copy of the lws ssh test public key, you can find it in + * /usr[/local]/share/libwebsockets-test-server/lws-ssh-test-keys.pub + * and the matching private key there too in .../lws-ssh-test-keys + * + * If the vhost with this protocol is using localhost:2222, you can test with + * the matching private key like this: + * + * ssh -p 2222 -i /usr/local/share/libwebsockets-test-server/lws-ssh-test-keys anyuser@127.0.0.1 + * + * These keys are distributed for testing! Don't use them on a real system + * unless you want anyone with a copy of lws to access it. + */ +static const char *authorized_key = + "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAACAQCnWiP+c+kSD6Lk+C6NA9KruApa45sbt" + "94/dxT0bCITlAA/+PBk6mR1lwWgXYozOMdrHrqx34piqDyXnc4HabqCaOm/FrYhkCPL8z" + "a26PMYqteSosuwKv//5iT6ZWhNnsMwExBwtV6MIq0MxAeWqxRnYNWpNM8iN6sFzkdG/YF" + "dyHrIBTgwzM77NLCMl6GEkJErRCFppC2SwYxGa3BRrgUwX3LkV8HpMIaYHFo1Qgj7Scqm" + "HwS2R75SOqi2aOWDpKjznARg9JgzDWSQi4seBMV2oL0BTwJANSDf+p0sQLsaKGJhpVpBQ" + "yS2wUeyuGyytupWzEluQrajMZq52iotcogv5BfeulfTTFbJP4kuHOsSP0lsQ2lpMDQANS" + "HEvXxzHJLDLXM9gXJzwJ+ZiRt6R+bfmP1nfN3MiWtxcIbBanWwQK6xTCKBe4wPaKta5EU" + "6wsLPeakOIVzoeaOu/HsbtPZlwX0Mu/oUFcfKyKAhlkU15MOAIEfUPo8Yh52bWMlIlpZa" + "4xWbLMGw3GrsrPPdcsAauyqvY4/NjjWQbWhP1SuUfvv5709PIiOUjVKK2HUwmR1ouch6X" + "MQGXfMR1h1Wjvc+bkNs17gCIrQnFilAZLC3Sm3Opiz/4LO99Hw448G0RM2vQn0mJE46w" + "Eu/B10U6Jf4Efojhh1dk85BD1LTIb+N3Q== ssh-test-key@lws"; + +enum states { + SSH_TEST_GREET, + SSH_TEST_PRESSED, + SSH_TEST_DONE, +}; + +static const char * const strings[] = + { + /* SSH_TEST_GREET */ + "Thanks for logging to lws sshd server demo.\n\r" + "\n\r" + "This demo is very simple, it waits for you to press\n\r" + "a key, and acknowledges it. Then press another key\n\r" + "and it will exit. But actually that demos the basic\n\r" + "sshd functions underneath. You can use the ops struct\n\r" + "members to add a pty / shell or whatever you want.\n\r" + "\n\r" + "Press a key...\n\r", + + /* SSH_TEST_PRESSED */ + "Thanks for pressing a key. Press another to exit.\n\r", + + /* SSH_TEST_DONE */ + "Bye!\n\r" + }; + +struct sshd_instance_priv { + struct lws *wsi; + enum states state; + const char *ptr; + int pos; + int len; +}; + +static void +enter_state(struct sshd_instance_priv *priv, enum states state) +{ + priv->state = state; + priv->ptr = strings[state]; + priv->pos = 0; + priv->len = strlen(priv->ptr); + + lws_callback_on_writable(priv->wsi); +} + +/* ops: channel lifecycle */ + +static int +ssh_ops_channel_create(struct lws *wsi, void **_priv) +{ + struct sshd_instance_priv *priv; + + priv = malloc(sizeof(struct sshd_instance_priv)); + *_priv = priv; + if (!priv) + return 1; + + memset(priv, 0, sizeof(*priv)); + priv->wsi = wsi; + + return 0; +} + +static int +ssh_ops_channel_destroy(void *_priv) +{ + struct sshd_instance_priv *priv = _priv; + + free(priv); + + return 0; +} + +/* ops: IO */ + +static int +ssh_ops_tx_waiting(void *_priv) +{ + struct sshd_instance_priv *priv = _priv; + + if (priv->state == SSH_TEST_DONE && + priv->pos == priv->len) + return -1; /* exit */ + + if (priv->pos != priv->len) + return LWS_STDOUT; + + return 0; +} + +static size_t +ssh_ops_tx(void *_priv, int stdch, uint8_t *buf, size_t len) +{ + struct sshd_instance_priv *priv = _priv; + size_t chunk = len; + + if (stdch != LWS_STDOUT) + return 0; + + if (priv->len - priv->pos < chunk) + chunk = priv->len - priv->pos; + + if (!chunk) + return 0; + + memcpy(buf, priv->ptr + priv->pos, chunk); + priv->pos += chunk; + + if (priv->state == SSH_TEST_DONE && priv->pos == priv->len) { + /* + * we are sending the last thing we want to send + * before exiting. Make it ask again at ssh_ops_tx_waiting() + * and we will exit then, after this has been sent + */ + lws_callback_on_writable(priv->wsi); + } + + return chunk; +} + + +static int +ssh_ops_rx(void *_priv, struct lws *wsi, const uint8_t *buf, uint32_t len) +{ + struct sshd_instance_priv *priv = _priv; + + if (priv->state < SSH_TEST_DONE) + enter_state(priv, priv->state + 1); + else + return -1; + + return 0; +} + +/* ops: storage for the (autogenerated) persistent server key */ + +static size_t +ssh_ops_get_server_key(struct lws *wsi, uint8_t *buf, size_t len) +{ + struct per_vhost_data__lws_sshd_demo *vhd = + (struct per_vhost_data__lws_sshd_demo *) + lws_protocol_vh_priv_get(lws_get_vhost(wsi), + lws_get_protocol(wsi)); + int n; + + lseek(vhd->privileged_fd, 0, SEEK_SET); + n = read(vhd->privileged_fd, buf, len); + if (n < 0) { + lwsl_err("%s: read failed: %d\n", __func__, n); + n = 0; + } + + return n; +} + +static size_t +ssh_ops_set_server_key(struct lws *wsi, uint8_t *buf, size_t len) +{ + struct per_vhost_data__lws_sshd_demo *vhd = + (struct per_vhost_data__lws_sshd_demo *) + lws_protocol_vh_priv_get(lws_get_vhost(wsi), + lws_get_protocol(wsi)); + int n; + + n = write(vhd->privileged_fd, buf, len); + if (n < 0) { + lwsl_err("%s: read failed: %d\n", __func__, errno); + n = 0; + } + + return n; +} + +/* ops: auth */ + +static int +ssh_ops_is_pubkey_authorized(const char *username, const char *type, + const uint8_t *peer, int peer_len) +{ + char *aps = NULL, *p, *ps; + int n = strlen(type), alen = 2048, ret = 2, len; + size_t s = 0; + + lwsl_info("%s: checking pubkey for %s\n", __func__, username); + + s = strlen(authorized_key) + 1; + + aps = malloc(s); + if (!aps) { + lwsl_notice("OOM 1\n"); + goto bail_p1; + } + memcpy(aps, authorized_key, s); + + /* we only understand RSA */ + if (strcmp(type, "ssh-rsa")) { + lwsl_notice("type is not ssh-rsa\n"); + goto bail_p1; + } + p = aps; + + if (strncmp(p, type, n)) { + lwsl_notice("lead-in string does not match %s\n", type); + goto bail_p1; + } + + p += n; + if (*p != ' ') { + lwsl_notice("missing space at end of lead-in\n"); + goto bail_p1; + } + + p++; + ps = malloc(alen); + if (!ps) { + lwsl_notice("OOM 2\n"); + free(aps); + goto bail; + } + len = lws_b64_decode_string(p, ps, alen); + free(aps); + if (len < 0) { + lwsl_notice("key too big\n"); + goto bail; + } + + if (peer_len > len) { + lwsl_notice("peer_len %d bigger than decoded len %d\n", + peer_len, len); + goto bail; + } + + /* + * once we are past that, it's the same name + * EN that the peer sends us + */ + if (memcmp(peer, ps, peer_len)) { + lwsl_info("factors mismatch\n"); + goto bail; + } + + lwsl_info("pubkey authorized\n"); + + ret = 0; +bail: + free(ps); + + return ret; + +bail_p1: + if (aps) + free(aps); + + return 1; +} + +static int +ssh_ops_shell(void *_priv, struct lws *wsi) +{ + struct sshd_instance_priv *priv = _priv; + + /* for this demo, we don't open a real shell */ + + enter_state(priv, SSH_TEST_GREET); + + return 0; +} + +/* ops: banner */ + +static size_t +ssh_ops_banner(char *buf, size_t max_len, char *lang, size_t max_lang_len) +{ + int n = snprintf(buf, max_len, "\n" + " |\\---/| lws-ssh Test Server\n" + " | o_o | SSH Terminal Server\n" + " \\_^_/ Copyright (C) 2017 Crash Barrier Ltd\n\n"); + + snprintf(lang, max_lang_len, "en/US"); + + return n; +} + +static void +ssh_ops_disconnect_reason(uint32_t reason, const char *desc, + const char *desc_lang) +{ + lwsl_notice("DISCONNECT reason 0x%X, %s (lang %s)\n", reason, desc, + desc_lang); +} + + +static const struct lws_ssh_ops ssh_ops = { + .channel_create = ssh_ops_channel_create, + .channel_destroy = ssh_ops_channel_destroy, + .tx_waiting = ssh_ops_tx_waiting, + .tx = ssh_ops_tx, + .rx = ssh_ops_rx, + .get_server_key = ssh_ops_get_server_key, + .set_server_key = ssh_ops_set_server_key, + .set_env = NULL, + .pty_req = NULL, + .child_process_io = NULL, + .child_process_terminated = NULL, + .exec = NULL, + .shell = ssh_ops_shell, + .is_pubkey_authorized = ssh_ops_is_pubkey_authorized, + .banner = ssh_ops_banner, + .disconnect_reason = ssh_ops_disconnect_reason, + .server_string = "SSH-2.0-Libwebsockets", + .api_version = 1, +}; + +static int +callback_lws_sshd_demo(struct lws *wsi, enum lws_callback_reasons reason, + void *user, void *in, size_t len) +{ + struct per_vhost_data__lws_sshd_demo *vhd = + (struct per_vhost_data__lws_sshd_demo *) + lws_protocol_vh_priv_get(lws_get_vhost(wsi), + lws_get_protocol(wsi)); + + switch (reason) { + case LWS_CALLBACK_PROTOCOL_INIT: + vhd = lws_protocol_vh_priv_zalloc(lws_get_vhost(wsi), + lws_get_protocol(wsi), + sizeof(struct per_vhost_data__lws_sshd_demo)); + /* + * During this we still have the privs / caps we were started + * with. So open an fd on the server key, either just for read + * or for creat / trunc if doesn't exist. This allows us to + * deal with it down /etc/.. when just after this we will lose + * the privileges needed to read / write /etc/... + */ + vhd->privileged_fd = open(TEST_SERVER_KEY_PATH, O_RDONLY); + if (vhd->privileged_fd == -1) + vhd->privileged_fd = open(TEST_SERVER_KEY_PATH, + O_CREAT | O_TRUNC | O_RDWR, 0600); + if (vhd->privileged_fd == -1) { + lwsl_err("%s: Can't open %s\n", __func__, + TEST_SERVER_KEY_PATH); + return -1; + } + break; + + case LWS_CALLBACK_PROTOCOL_DESTROY: + close(vhd->privileged_fd); + break; + + default: + if (!vhd->ssh_base_protocol) { + vhd->ssh_base_protocol = lws_vhost_name_to_protocol( + lws_get_vhost(wsi), + "lws-ssh-base"); + if (vhd->ssh_base_protocol) + user = lws_adjust_protocol_psds(wsi, + vhd->ssh_base_protocol->per_session_data_size); + } + + if (vhd->ssh_base_protocol) + return vhd->ssh_base_protocol->callback(wsi, reason, + user, in, len); + else + lwsl_notice("can't find lws-ssh-base\n"); + break; + } + + return 0; +} + +#define LWS_PLUGIN_PROTOCOL_LWS_SSHD_DEMO \ + { \ + "lws-sshd-demo", \ + callback_lws_sshd_demo, \ + 0, \ + 1024, /* rx buf size must be >= permessage-deflate rx size */ \ + 0, (void *)&ssh_ops, 0 \ + } + +#if !defined (LWS_PLUGIN_STATIC) + +static const struct lws_protocols protocols[] = { + LWS_PLUGIN_PROTOCOL_LWS_SSHD_DEMO +}; + +LWS_EXTERN LWS_VISIBLE int +init_protocol_lws_sshd_demo(struct lws_context *context, + struct lws_plugin_capability *c) +{ + if (c->api_magic != LWS_PLUGIN_API_MAGIC) { + lwsl_err("Plugin API %d, library API %d", LWS_PLUGIN_API_MAGIC, + c->api_magic); + return 1; + } + + c->protocols = protocols; + c->count_protocols = ARRAY_SIZE(protocols); + c->extensions = NULL; + c->count_extensions = 0; + + return 0; +} + +LWS_EXTERN LWS_VISIBLE int +destroy_protocol_lws_sshd_demo(struct lws_context *context) +{ + return 0; +} + +#endif diff --git a/plugins/ssh-base/crypto/chacha.c b/plugins/ssh-base/crypto/chacha.c new file mode 100644 index 000000000..46d46cb81 --- /dev/null +++ b/plugins/ssh-base/crypto/chacha.c @@ -0,0 +1,367 @@ +/* +chacha-merged.c version 20080118 +D. J. Bernstein +Public domain. +*/ + +#include +#include "lws-ssh.h" + +#include + +struct chacha_ctx { + u_int input[16]; +}; + +#define CHACHA_MINKEYLEN 16 +#define CHACHA_NONCELEN 8 +#define CHACHA_CTRLEN 8 +#define CHACHA_STATELEN (CHACHA_NONCELEN+CHACHA_CTRLEN) +#define CHACHA_BLOCKLEN 64 + +typedef unsigned char u8; +typedef unsigned int u32; + +typedef struct chacha_ctx chacha_ctx; + +#define U8C(v) (v##U) +#define U32C(v) (v##U) + +#define U8V(v) ((u8)(v) & U8C(0xFF)) +#define U32V(v) ((u32)(v) & U32C(0xFFFFFFFF)) + +#define ROTL32(v, n) \ + (U32V((v) << (n)) | ((v) >> (32 - (n)))) + +#define U8TO32_LITTLE(p) \ + (((u32)((p)[0]) ) | \ + ((u32)((p)[1]) << 8) | \ + ((u32)((p)[2]) << 16) | \ + ((u32)((p)[3]) << 24)) + +#define U32TO8_LITTLE(p, v) \ + do { \ + (p)[0] = U8V((v) ); \ + (p)[1] = U8V((v) >> 8); \ + (p)[2] = U8V((v) >> 16); \ + (p)[3] = U8V((v) >> 24); \ + } while (0) + +#define ROTATE(v,c) (ROTL32(v,c)) +#define XOR(v,w) ((v) ^ (w)) +#define PLUS(v,w) (U32V((v) + (w))) +#define PLUSONE(v) (PLUS((v),1)) + +#define QUARTERROUND(a,b,c,d) \ + a = PLUS(a,b); d = ROTATE(XOR(d,a),16); \ + c = PLUS(c,d); b = ROTATE(XOR(b,c),12); \ + a = PLUS(a,b); d = ROTATE(XOR(d,a), 8); \ + c = PLUS(c,d); b = ROTATE(XOR(b,c), 7); + +static const char sigma[16] = "expand 32-byte k"; +static const char tau[16] = "expand 16-byte k"; + +void +chacha_keysetup(chacha_ctx *x,const u8 *k,u32 kbits) +{ + const char *constants; + + x->input[4] = U8TO32_LITTLE(k + 0); + x->input[5] = U8TO32_LITTLE(k + 4); + x->input[6] = U8TO32_LITTLE(k + 8); + x->input[7] = U8TO32_LITTLE(k + 12); + if (kbits == 256) { /* recommended */ + k += 16; + constants = sigma; + } else { /* kbits == 128 */ + constants = tau; + } + x->input[8] = U8TO32_LITTLE(k + 0); + x->input[9] = U8TO32_LITTLE(k + 4); + x->input[10] = U8TO32_LITTLE(k + 8); + x->input[11] = U8TO32_LITTLE(k + 12); + x->input[0] = U8TO32_LITTLE(constants + 0); + x->input[1] = U8TO32_LITTLE(constants + 4); + x->input[2] = U8TO32_LITTLE(constants + 8); + x->input[3] = U8TO32_LITTLE(constants + 12); +} + +void +chacha_ivsetup(chacha_ctx *x, const u8 *iv, const u8 *counter) +{ + x->input[12] = counter == NULL ? 0 : U8TO32_LITTLE(counter + 0); + x->input[13] = counter == NULL ? 0 : U8TO32_LITTLE(counter + 4); + x->input[14] = U8TO32_LITTLE(iv + 0); + x->input[15] = U8TO32_LITTLE(iv + 4); +} + +void +chacha_encrypt_bytes(chacha_ctx *x,const u8 *m,u8 *c,u32 bytes) +{ + u32 x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15; + u32 j0, j1, j2, j3, j4, j5, j6, j7, j8, j9, j10, j11, j12, j13, j14, j15; + u8 *ctarget = NULL; + u8 tmp[64]; + u_int i; + + if (!bytes) return; + + j0 = x->input[0]; + j1 = x->input[1]; + j2 = x->input[2]; + j3 = x->input[3]; + j4 = x->input[4]; + j5 = x->input[5]; + j6 = x->input[6]; + j7 = x->input[7]; + j8 = x->input[8]; + j9 = x->input[9]; + j10 = x->input[10]; + j11 = x->input[11]; + j12 = x->input[12]; + j13 = x->input[13]; + j14 = x->input[14]; + j15 = x->input[15]; + + for (;;) { + if (bytes < 64) { + for (i = 0;i < bytes;++i) tmp[i] = m[i]; + m = tmp; + ctarget = c; + c = tmp; + } + x0 = j0; + x1 = j1; + x2 = j2; + x3 = j3; + x4 = j4; + x5 = j5; + x6 = j6; + x7 = j7; + x8 = j8; + x9 = j9; + x10 = j10; + x11 = j11; + x12 = j12; + x13 = j13; + x14 = j14; + x15 = j15; + for (i = 20;i > 0;i -= 2) { + QUARTERROUND( x0, x4, x8,x12) + QUARTERROUND( x1, x5, x9,x13) + QUARTERROUND( x2, x6,x10,x14) + QUARTERROUND( x3, x7,x11,x15) + QUARTERROUND( x0, x5,x10,x15) + QUARTERROUND( x1, x6,x11,x12) + QUARTERROUND( x2, x7, x8,x13) + QUARTERROUND( x3, x4, x9,x14) + } + x0 = PLUS(x0,j0); + x1 = PLUS(x1,j1); + x2 = PLUS(x2,j2); + x3 = PLUS(x3,j3); + x4 = PLUS(x4,j4); + x5 = PLUS(x5,j5); + x6 = PLUS(x6,j6); + x7 = PLUS(x7,j7); + x8 = PLUS(x8,j8); + x9 = PLUS(x9,j9); + x10 = PLUS(x10,j10); + x11 = PLUS(x11,j11); + x12 = PLUS(x12,j12); + x13 = PLUS(x13,j13); + x14 = PLUS(x14,j14); + x15 = PLUS(x15,j15); + + x0 = XOR(x0,U8TO32_LITTLE(m + 0)); + x1 = XOR(x1,U8TO32_LITTLE(m + 4)); + x2 = XOR(x2,U8TO32_LITTLE(m + 8)); + x3 = XOR(x3,U8TO32_LITTLE(m + 12)); + x4 = XOR(x4,U8TO32_LITTLE(m + 16)); + x5 = XOR(x5,U8TO32_LITTLE(m + 20)); + x6 = XOR(x6,U8TO32_LITTLE(m + 24)); + x7 = XOR(x7,U8TO32_LITTLE(m + 28)); + x8 = XOR(x8,U8TO32_LITTLE(m + 32)); + x9 = XOR(x9,U8TO32_LITTLE(m + 36)); + x10 = XOR(x10,U8TO32_LITTLE(m + 40)); + x11 = XOR(x11,U8TO32_LITTLE(m + 44)); + x12 = XOR(x12,U8TO32_LITTLE(m + 48)); + x13 = XOR(x13,U8TO32_LITTLE(m + 52)); + x14 = XOR(x14,U8TO32_LITTLE(m + 56)); + x15 = XOR(x15,U8TO32_LITTLE(m + 60)); + + j12 = PLUSONE(j12); + if (!j12) + j13 = PLUSONE(j13); + /* stopping at 2^70 bytes per nonce is user's responsibility */ + + U32TO8_LITTLE(c + 0,x0); + U32TO8_LITTLE(c + 4,x1); + U32TO8_LITTLE(c + 8,x2); + U32TO8_LITTLE(c + 12,x3); + U32TO8_LITTLE(c + 16,x4); + U32TO8_LITTLE(c + 20,x5); + U32TO8_LITTLE(c + 24,x6); + U32TO8_LITTLE(c + 28,x7); + U32TO8_LITTLE(c + 32,x8); + U32TO8_LITTLE(c + 36,x9); + U32TO8_LITTLE(c + 40,x10); + U32TO8_LITTLE(c + 44,x11); + U32TO8_LITTLE(c + 48,x12); + U32TO8_LITTLE(c + 52,x13); + U32TO8_LITTLE(c + 56,x14); + U32TO8_LITTLE(c + 60,x15); + + if (bytes <= 64) { + if (bytes < 64) { + for (i = 0;i < bytes;++i) ctarget[i] = c[i]; + } + x->input[12] = j12; + x->input[13] = j13; + return; + } + bytes -= 64; + c += 64; + m += 64; + } +} + +struct lws_cipher_chacha { + struct chacha_ctx ccctx[2]; +}; + +#define K_1(_keys) &((struct lws_cipher_chacha *)_keys->cipher)->ccctx[0] +#define K_2(_keys) &((struct lws_cipher_chacha *)_keys->cipher)->ccctx[1] + +int +lws_chacha_activate(struct lws_ssh_keys *keys) +{ + if (keys->cipher) { + free(keys->cipher); + keys->cipher = NULL; + } + + keys->cipher = malloc(sizeof(struct lws_cipher_chacha)); + if (!keys->cipher) + return 1; + + memset(keys->cipher, 0, sizeof(struct lws_cipher_chacha)); + + /* uses 2 x 256-bit keys, so 512 bits (64 bytes) needed */ + chacha_keysetup(K_2(keys), keys->key[SSH_KEYIDX_ENC], 256); + chacha_keysetup(K_1(keys), &keys->key[SSH_KEYIDX_ENC][32], 256); + + keys->valid = 1; + keys->full_length = 1; + keys->padding_alignment = 8; // CHACHA_BLOCKLEN; + keys->MAC_length = POLY1305_TAGLEN; + + return 0; +} + +void +lws_chacha_destroy(struct lws_ssh_keys *keys) +{ + if (keys->cipher) { + free(keys->cipher); + keys->cipher = NULL; + } +} + +uint32_t +lws_chachapoly_get_length(struct lws_ssh_keys *keys, uint32_t seq, + const uint8_t *in4) +{ + uint8_t buf[4], seqbuf[8]; + + /* + * When receiving a packet, the length must be decrypted first. When 4 + * bytes of ciphertext length have been received, they may be decrypted + * using the K_1 key, a nonce consisting of the packet sequence number + * encoded as a uint64 under the usual SSH wire encoding and a zero + * block counter to obtain the plaintext length. + */ + POKE_U64(seqbuf, seq); + chacha_ivsetup(K_1(keys), seqbuf, NULL); + chacha_encrypt_bytes(K_1(keys), in4, buf, 4); + + return PEEK_U32(buf); +} + +/* + * chachapoly_crypt() operates as following: + * En/decrypt with header key 'aadlen' bytes from 'src', storing result + * to 'dest'. The ciphertext here is treated as additional authenticated + * data for MAC calculation. + * En/decrypt 'len' bytes at offset 'aadlen' from 'src' to 'dest'. Use + * POLY1305_TAGLEN bytes at offset 'len'+'aadlen' as the authentication + * tag. This tag is written on encryption and verified on decryption. + */ +int +chachapoly_crypt(struct lws_ssh_keys *keys, u_int seqnr, u_char *dest, + const u_char *src, u_int len, u_int aadlen, u_int authlen, int do_encrypt) +{ + u_char seqbuf[8]; + const u_char one[8] = { 1, 0, 0, 0, 0, 0, 0, 0 }; /* NB little-endian */ + u_char expected_tag[POLY1305_TAGLEN], poly_key[POLY1305_KEYLEN]; + int r = 1; + + /* + * Run ChaCha20 once to generate the Poly1305 key. The IV is the + * packet sequence number. + */ + memset(poly_key, 0, sizeof(poly_key)); + POKE_U64(seqbuf, seqnr); + chacha_ivsetup(K_2(keys), seqbuf, NULL); + chacha_encrypt_bytes(K_2(keys), + poly_key, poly_key, sizeof(poly_key)); + + /* If decrypting, check tag before anything else */ + if (!do_encrypt) { + const u_char *tag = src + aadlen + len; + + poly1305_auth(expected_tag, src, aadlen + len, poly_key); + if (timingsafe_bcmp(expected_tag, tag, POLY1305_TAGLEN) != 0) { + r = 2; + goto out; + } + } + + /* Crypt additional data */ + if (aadlen) { + chacha_ivsetup(K_1(keys), seqbuf, NULL); + chacha_encrypt_bytes(K_1(keys), src, dest, aadlen); + } + + /* Set Chacha's block counter to 1 */ + chacha_ivsetup(K_2(keys), seqbuf, one); + chacha_encrypt_bytes(K_2(keys), src + aadlen, dest + aadlen, len); + + /* If encrypting, calculate and append tag */ + if (do_encrypt) { + poly1305_auth(dest + aadlen + len, dest, aadlen + len, + poly_key); + } + r = 0; + out: + explicit_bzero(expected_tag, sizeof(expected_tag)); + explicit_bzero(seqbuf, sizeof(seqbuf)); + explicit_bzero(poly_key, sizeof(poly_key)); + return r; +} + +int +lws_chacha_decrypt(struct lws_ssh_keys *keys, uint32_t seq, + const uint8_t *ct, uint32_t len, uint8_t *pt) +{ + return chachapoly_crypt(keys, seq, pt, ct, len - POLY1305_TAGLEN - 4, 4, + POLY1305_TAGLEN, 0); +} + +int +lws_chacha_encrypt(struct lws_ssh_keys *keys, uint32_t seq, + const uint8_t *ct, uint32_t len, uint8_t *pt) +{ + return chachapoly_crypt(keys, seq, pt, ct, len - 4, 4, 0, 1); +} + diff --git a/plugins/ssh-base/crypto/ed25519.c b/plugins/ssh-base/crypto/ed25519.c new file mode 100644 index 000000000..72b3ae7c5 --- /dev/null +++ b/plugins/ssh-base/crypto/ed25519.c @@ -0,0 +1,221 @@ +/* $OpenBSD: ed25519.c,v 1.3 2013/12/09 11:03:45 markus Exp $ */ + +/* + * Public Domain, Authors: Daniel J. Bernstein, Niels Duif, Tanja Lange, + * Peter Schwabe, Bo-Yin Yang. + * Copied from supercop-20130419/crypto_sign/ed25519/ref/ed25519.c + * + * Modified to use lws genhash by Andy Green + */ + +#include +#include +#include "ge25519.h" + +int +crypto_hash_sha512(uint8_t *hash64, const uint8_t *data, size_t len) +{ + struct lws_genhash_ctx ctx; + int ret; + + if (lws_genhash_init(&ctx, LWS_GENHASH_TYPE_SHA512)) { + lwsl_notice("Failed to init SHA512\n"); + return 0; + } + + ret = lws_genhash_update(&ctx, data, len); + + if (lws_genhash_destroy(&ctx, hash64)) + lwsl_notice("genhash destroy failed\n"); + + return ret ? 0 : 64; +} + + +static void +get_hram(unsigned char *hram, const unsigned char *sm, + const unsigned char *pk, unsigned char *playground, + size_t smlen) +{ + unsigned long long i; + + for (i = 0; i < 32; ++i) + playground[i] = sm[i]; + for (i = 32; i < 64; ++i) + playground[i] = pk[i-32]; + for (i = 64; i < smlen; ++i) + playground[i] = sm[i]; + + crypto_hash_sha512(hram, playground, smlen); +} + + +int crypto_sign_ed25519_keypair( + struct lws_context *context, + unsigned char *pk, + unsigned char *sk + ) +{ + sc25519 scsk; + ge25519 gepk; + unsigned char extsk[64]; + int i; + + lws_get_random(context, sk, 32); + crypto_hash_sha512(extsk, sk, 32); + extsk[0] &= 248; + extsk[31] &= 127; + extsk[31] |= 64; + + sc25519_from32bytes(&scsk,extsk); + + ge25519_scalarmult_base(&gepk, &scsk); + ge25519_pack(pk, &gepk); + for(i=0;i<32;i++) + sk[32 + i] = pk[i]; + return 0; +} + +int crypto_sign_ed25519( + unsigned char *sm, + unsigned long long *smlen, + const unsigned char *m, size_t mlen, + const unsigned char *sk + ) +{ + sc25519 sck, scs, scsk; + ge25519 ger; + unsigned char r[32]; + unsigned char s[32]; + unsigned char extsk[64]; + unsigned long long i; + unsigned char hmg[crypto_hash_sha512_BYTES]; + unsigned char hram[crypto_hash_sha512_BYTES]; + + crypto_hash_sha512(extsk, sk, 32); + extsk[0] &= 248; + extsk[31] &= 127; + extsk[31] |= 64; + + *smlen = mlen+64; + for(i=0;i> 8)) - 1; +} + +int crypto_sign_ed25519_open( + unsigned char *m,unsigned long long *mlen, + const unsigned char *sm,unsigned long long smlen, + const unsigned char *pk + ) +{ + unsigned int i; + int ret; + unsigned char t2[32]; + ge25519 get1, get2; + sc25519 schram, scs; + unsigned char hram[crypto_hash_sha512_BYTES]; + + *mlen = (unsigned long long) -1; + if (smlen < 64) { + lwsl_notice("a\n"); + + return -1; + } + + if (ge25519_unpackneg_vartime(&get1, pk)) { + lwsl_notice("b\n"); + return -1; + } + + get_hram(hram,sm,pk,m, (size_t)smlen); + + sc25519_from64bytes(&schram, hram); + + sc25519_from32bytes(&scs, sm+32); + + ge25519_double_scalarmult_vartime(&get2, &get1, &schram, &ge25519_base, &scs); + ge25519_pack(t2, &get2); + + ret = crypto_verify_32(sm, t2); + lwsl_notice("vf says %d\n", ret); + + if (!ret) + { + for(i=0;i>= 31; /* 1: yes; 0: no */ + return x; +} + +static uint32_t ge(uint32_t a,uint32_t b) /* 16-bit inputs */ +{ + unsigned int x = a; + x -= (unsigned int) b; /* 0..65535: yes; 4294901761..4294967295: no */ + x >>= 31; /* 0: yes; 1: no */ + x ^= 1; /* 1: yes; 0: no */ + return x; +} + +static uint32_t times19(uint32_t a) +{ + return (a << 4) + (a << 1) + a; +} + +static uint32_t times38(uint32_t a) +{ + return (a << 5) + (a << 2) + (a << 1); +} + +static void fe_reduce_add_sub(fe25519 *r) +{ + uint32_t t; + int i,rep; + + for(rep=0;rep<4;rep++) + { + t = r->v[31] >> 7; + r->v[31] &= 127; + t = times19(t); + r->v[0] += t; + for(i=0;i<31;i++) + { + t = r->v[i] >> 8; + r->v[i+1] += t; + r->v[i] &= 255; + } + } +} + +static void reduce_mul(fe25519 *r) +{ + uint32_t t; + int i,rep; + + for(rep=0;rep<2;rep++) + { + t = r->v[31] >> 7; + r->v[31] &= 127; + t = times19(t); + r->v[0] += t; + for(i=0;i<31;i++) + { + t = r->v[i] >> 8; + r->v[i+1] += t; + r->v[i] &= 255; + } + } +} + +/* reduction modulo 2^255-19 */ +void fe25519_freeze(fe25519 *r) +{ + int i; + uint32_t m = fe_equal(r->v[31],127); + + for(i=30;i>0;i--) + m &= fe_equal(r->v[i],255); + m &= ge(r->v[0],237); + + m = -(int32_t)m; + + r->v[31] -= m&127; + for(i=30;i>0;i--) + r->v[i] -= m&255; + r->v[0] -= m&237; +} + +void fe25519_unpack(fe25519 *r, const unsigned char x[32]) +{ + int i; + for(i=0;i<32;i++) r->v[i] = x[i]; + r->v[31] &= 127; +} + +/* Assumes input x being reduced below 2^255 */ +void fe25519_pack(unsigned char r[32], const fe25519 *x) +{ + int i; + fe25519 y = *x; + fe25519_freeze(&y); + for(i=0;i<32;i++) + r[i] = y.v[i]; +} + +int fe25519_iszero(const fe25519 *x) +{ + int i; + int r; + fe25519 t = *x; + fe25519_freeze(&t); + r = fe_equal(t.v[0],0); + for(i=1;i<32;i++) + r &= fe_equal(t.v[i],0); + return r; +} + +int fe25519_iseq_vartime(const fe25519 *x, const fe25519 *y) +{ + int i; + fe25519 t1 = *x; + fe25519 t2 = *y; + fe25519_freeze(&t1); + fe25519_freeze(&t2); + for(i=0;i<32;i++) + if(t1.v[i] != t2.v[i]) return 0; + return 1; +} + +void fe25519_cmov(fe25519 *r, const fe25519 *x, unsigned char b) +{ + int i; + uint32_t mask = b; + mask = -(int32_t)mask; + for(i=0;i<32;i++) r->v[i] ^= mask & (x->v[i] ^ r->v[i]); +} + +unsigned char fe25519_getparity(const fe25519 *x) +{ + fe25519 t = *x; + fe25519_freeze(&t); + return (unsigned char)(t.v[0] & 1); +} + +void fe25519_setone(fe25519 *r) +{ + int i; + r->v[0] = 1; + for(i=1;i<32;i++) r->v[i]=0; +} + +void fe25519_setzero(fe25519 *r) +{ + int i; + for(i=0;i<32;i++) r->v[i]=0; +} + +void fe25519_neg(fe25519 *r, const fe25519 *x) +{ + fe25519 t; + int i; + for(i=0;i<32;i++) t.v[i]=x->v[i]; + fe25519_setzero(r); + fe25519_sub(r, r, &t); +} + +void fe25519_add(fe25519 *r, const fe25519 *x, const fe25519 *y) +{ + int i; + for(i=0;i<32;i++) r->v[i] = x->v[i] + y->v[i]; + fe_reduce_add_sub(r); +} + +void fe25519_sub(fe25519 *r, const fe25519 *x, const fe25519 *y) +{ + int i; + uint32_t t[32]; + t[0] = x->v[0] + 0x1da; + t[31] = x->v[31] + 0xfe; + for(i=1;i<31;i++) t[i] = x->v[i] + 0x1fe; + for(i=0;i<32;i++) r->v[i] = t[i] - y->v[i]; + fe_reduce_add_sub(r); +} + +void fe25519_mul(fe25519 *r, const fe25519 *x, const fe25519 *y) +{ + int i,j; + uint32_t t[63]; + for(i=0;i<63;i++)t[i] = 0; + + for(i=0;i<32;i++) + for(j=0;j<32;j++) + t[i+j] += x->v[i] * y->v[j]; + + for(i=32;i<63;i++) + r->v[i-32] = t[i-32] + times38(t[i]); + r->v[31] = t[31]; /* result now in r[0]...r[31] */ + + reduce_mul(r); +} + +void fe25519_square(fe25519 *r, const fe25519 *x) +{ + fe25519_mul(r, x, x); +} + +void fe25519_invert(fe25519 *r, const fe25519 *x) +{ + fe25519 z2; + fe25519 z9; + fe25519 z11; + fe25519 z2_5_0; + fe25519 z2_10_0; + fe25519 z2_20_0; + fe25519 z2_50_0; + fe25519 z2_100_0; + fe25519 t0; + fe25519 t1; + int i; + + /* 2 */ fe25519_square(&z2,x); + /* 4 */ fe25519_square(&t1,&z2); + /* 8 */ fe25519_square(&t0,&t1); + /* 9 */ fe25519_mul(&z9,&t0,x); + /* 11 */ fe25519_mul(&z11,&z9,&z2); + /* 22 */ fe25519_square(&t0,&z11); + /* 2^5 - 2^0 = 31 */ fe25519_mul(&z2_5_0,&t0,&z9); + + /* 2^6 - 2^1 */ fe25519_square(&t0,&z2_5_0); + /* 2^7 - 2^2 */ fe25519_square(&t1,&t0); + /* 2^8 - 2^3 */ fe25519_square(&t0,&t1); + /* 2^9 - 2^4 */ fe25519_square(&t1,&t0); + /* 2^10 - 2^5 */ fe25519_square(&t0,&t1); + /* 2^10 - 2^0 */ fe25519_mul(&z2_10_0,&t0,&z2_5_0); + + /* 2^11 - 2^1 */ fe25519_square(&t0,&z2_10_0); + /* 2^12 - 2^2 */ fe25519_square(&t1,&t0); + /* 2^20 - 2^10 */ for (i = 2;i < 10;i += 2) { fe25519_square(&t0,&t1); fe25519_square(&t1,&t0); } + /* 2^20 - 2^0 */ fe25519_mul(&z2_20_0,&t1,&z2_10_0); + + /* 2^21 - 2^1 */ fe25519_square(&t0,&z2_20_0); + /* 2^22 - 2^2 */ fe25519_square(&t1,&t0); + /* 2^40 - 2^20 */ for (i = 2;i < 20;i += 2) { fe25519_square(&t0,&t1); fe25519_square(&t1,&t0); } + /* 2^40 - 2^0 */ fe25519_mul(&t0,&t1,&z2_20_0); + + /* 2^41 - 2^1 */ fe25519_square(&t1,&t0); + /* 2^42 - 2^2 */ fe25519_square(&t0,&t1); + /* 2^50 - 2^10 */ for (i = 2;i < 10;i += 2) { fe25519_square(&t1,&t0); fe25519_square(&t0,&t1); } + /* 2^50 - 2^0 */ fe25519_mul(&z2_50_0,&t0,&z2_10_0); + + /* 2^51 - 2^1 */ fe25519_square(&t0,&z2_50_0); + /* 2^52 - 2^2 */ fe25519_square(&t1,&t0); + /* 2^100 - 2^50 */ for (i = 2;i < 50;i += 2) { fe25519_square(&t0,&t1); fe25519_square(&t1,&t0); } + /* 2^100 - 2^0 */ fe25519_mul(&z2_100_0,&t1,&z2_50_0); + + /* 2^101 - 2^1 */ fe25519_square(&t1,&z2_100_0); + /* 2^102 - 2^2 */ fe25519_square(&t0,&t1); + /* 2^200 - 2^100 */ for (i = 2;i < 100;i += 2) { fe25519_square(&t1,&t0); fe25519_square(&t0,&t1); } + /* 2^200 - 2^0 */ fe25519_mul(&t1,&t0,&z2_100_0); + + /* 2^201 - 2^1 */ fe25519_square(&t0,&t1); + /* 2^202 - 2^2 */ fe25519_square(&t1,&t0); + /* 2^250 - 2^50 */ for (i = 2;i < 50;i += 2) { fe25519_square(&t0,&t1); fe25519_square(&t1,&t0); } + /* 2^250 - 2^0 */ fe25519_mul(&t0,&t1,&z2_50_0); + + /* 2^251 - 2^1 */ fe25519_square(&t1,&t0); + /* 2^252 - 2^2 */ fe25519_square(&t0,&t1); + /* 2^253 - 2^3 */ fe25519_square(&t1,&t0); + /* 2^254 - 2^4 */ fe25519_square(&t0,&t1); + /* 2^255 - 2^5 */ fe25519_square(&t1,&t0); + /* 2^255 - 21 */ fe25519_mul(r,&t1,&z11); +} + +void fe25519_pow2523(fe25519 *r, const fe25519 *x) +{ + fe25519 z2; + fe25519 z9; + fe25519 z11; + fe25519 z2_5_0; + fe25519 z2_10_0; + fe25519 z2_20_0; + fe25519 z2_50_0; + fe25519 z2_100_0; + fe25519 t; + int i; + + /* 2 */ fe25519_square(&z2,x); + /* 4 */ fe25519_square(&t,&z2); + /* 8 */ fe25519_square(&t,&t); + /* 9 */ fe25519_mul(&z9,&t,x); + /* 11 */ fe25519_mul(&z11,&z9,&z2); + /* 22 */ fe25519_square(&t,&z11); + /* 2^5 - 2^0 = 31 */ fe25519_mul(&z2_5_0,&t,&z9); + + /* 2^6 - 2^1 */ fe25519_square(&t,&z2_5_0); + /* 2^10 - 2^5 */ for (i = 1;i < 5;i++) { fe25519_square(&t,&t); } + /* 2^10 - 2^0 */ fe25519_mul(&z2_10_0,&t,&z2_5_0); + + /* 2^11 - 2^1 */ fe25519_square(&t,&z2_10_0); + /* 2^20 - 2^10 */ for (i = 1;i < 10;i++) { fe25519_square(&t,&t); } + /* 2^20 - 2^0 */ fe25519_mul(&z2_20_0,&t,&z2_10_0); + + /* 2^21 - 2^1 */ fe25519_square(&t,&z2_20_0); + /* 2^40 - 2^20 */ for (i = 1;i < 20;i++) { fe25519_square(&t,&t); } + /* 2^40 - 2^0 */ fe25519_mul(&t,&t,&z2_20_0); + + /* 2^41 - 2^1 */ fe25519_square(&t,&t); + /* 2^50 - 2^10 */ for (i = 1;i < 10;i++) { fe25519_square(&t,&t); } + /* 2^50 - 2^0 */ fe25519_mul(&z2_50_0,&t,&z2_10_0); + + /* 2^51 - 2^1 */ fe25519_square(&t,&z2_50_0); + /* 2^100 - 2^50 */ for (i = 1;i < 50;i++) { fe25519_square(&t,&t); } + /* 2^100 - 2^0 */ fe25519_mul(&z2_100_0,&t,&z2_50_0); + + /* 2^101 - 2^1 */ fe25519_square(&t,&z2_100_0); + /* 2^200 - 2^100 */ for (i = 1;i < 100;i++) { fe25519_square(&t,&t); } + /* 2^200 - 2^0 */ fe25519_mul(&t,&t,&z2_100_0); + + /* 2^201 - 2^1 */ fe25519_square(&t,&t); + /* 2^250 - 2^50 */ for (i = 1;i < 50;i++) { fe25519_square(&t,&t); } + /* 2^250 - 2^0 */ fe25519_mul(&t,&t,&z2_50_0); + + /* 2^251 - 2^1 */ fe25519_square(&t,&t); + /* 2^252 - 2^2 */ fe25519_square(&t,&t); + /* 2^252 - 3 */ fe25519_mul(r,&t,x); +} diff --git a/plugins/ssh-base/crypto/fe25519.h b/plugins/ssh-base/crypto/fe25519.h new file mode 100644 index 000000000..c1f5bf55c --- /dev/null +++ b/plugins/ssh-base/crypto/fe25519.h @@ -0,0 +1,68 @@ +/* $OpenBSD: fe25519.h,v 1.3 2013/12/09 11:03:45 markus Exp $ */ + +/* + * Public Domain, Authors: Daniel J. Bernstein, Niels Duif, Tanja Lange, + * Peter Schwabe, Bo-Yin Yang. + * Copied from supercop-20130419/crypto_sign/ed25519/ref/fe25519.h + */ + +#ifndef FE25519_H +#define FE25519_H + +#define fe25519 crypto_sign_ed25519_ref_fe25519 +#define fe25519_freeze crypto_sign_ed25519_ref_fe25519_freeze +#define fe25519_unpack crypto_sign_ed25519_ref_fe25519_unpack +#define fe25519_pack crypto_sign_ed25519_ref_fe25519_pack +#define fe25519_iszero crypto_sign_ed25519_ref_fe25519_iszero +#define fe25519_iseq_vartime crypto_sign_ed25519_ref_fe25519_iseq_vartime +#define fe25519_cmov crypto_sign_ed25519_ref_fe25519_cmov +#define fe25519_setone crypto_sign_ed25519_ref_fe25519_setone +#define fe25519_setzero crypto_sign_ed25519_ref_fe25519_setzero +#define fe25519_neg crypto_sign_ed25519_ref_fe25519_neg +#define fe25519_getparity crypto_sign_ed25519_ref_fe25519_getparity +#define fe25519_add crypto_sign_ed25519_ref_fe25519_add +#define fe25519_sub crypto_sign_ed25519_ref_fe25519_sub +#define fe25519_mul crypto_sign_ed25519_ref_fe25519_mul +#define fe25519_square crypto_sign_ed25519_ref_fe25519_square +#define fe25519_invert crypto_sign_ed25519_ref_fe25519_invert +#define fe25519_pow2523 crypto_sign_ed25519_ref_fe25519_pow2523 + +typedef struct +{ + uint32_t v[32]; +} +fe25519; + +void fe25519_freeze(fe25519 *r); + +void fe25519_unpack(fe25519 *r, const unsigned char x[32]); + +void fe25519_pack(unsigned char r[32], const fe25519 *x); + +int fe25519_iszero(const fe25519 *x); + +int fe25519_iseq_vartime(const fe25519 *x, const fe25519 *y); + +void fe25519_cmov(fe25519 *r, const fe25519 *x, unsigned char b); + +void fe25519_setone(fe25519 *r); + +void fe25519_setzero(fe25519 *r); + +void fe25519_neg(fe25519 *r, const fe25519 *x); + +unsigned char fe25519_getparity(const fe25519 *x); + +void fe25519_add(fe25519 *r, const fe25519 *x, const fe25519 *y); + +void fe25519_sub(fe25519 *r, const fe25519 *x, const fe25519 *y); + +void fe25519_mul(fe25519 *r, const fe25519 *x, const fe25519 *y); + +void fe25519_square(fe25519 *r, const fe25519 *x); + +void fe25519_invert(fe25519 *r, const fe25519 *x); + +void fe25519_pow2523(fe25519 *r, const fe25519 *x); + +#endif diff --git a/plugins/ssh-base/crypto/ge25519.c b/plugins/ssh-base/crypto/ge25519.c new file mode 100644 index 000000000..0c6273bbc --- /dev/null +++ b/plugins/ssh-base/crypto/ge25519.c @@ -0,0 +1,321 @@ +/* $OpenBSD: ge25519.c,v 1.3 2013/12/09 11:03:45 markus Exp $ */ + +/* + * Public Domain, Authors: Daniel J. Bernstein, Niels Duif, Tanja Lange, + * Peter Schwabe, Bo-Yin Yang. + * Copied from supercop-20130419/crypto_sign/ed25519/ref/ge25519.c + */ + +#include + +#include "fe25519.h" +#include "sc25519.h" +#include "ge25519.h" + +/* + * Arithmetic on the twisted Edwards curve -x^2 + y^2 = 1 + dx^2y^2 + * with d = -(121665/121666) = 37095705934669439343138083508754565189542113879843219016388785533085940283555 + * Base point: (15112221349535400772501151409588531511454012693041857206046113283949847762202,46316835694926478169428394003475163141307993866256225615783033603165251855960); + */ + +/* d */ +static const fe25519 ge25519_ecd = {{0xA3, 0x78, 0x59, 0x13, 0xCA, 0x4D, 0xEB, 0x75, 0xAB, 0xD8, 0x41, 0x41, 0x4D, 0x0A, 0x70, 0x00, + 0x98, 0xE8, 0x79, 0x77, 0x79, 0x40, 0xC7, 0x8C, 0x73, 0xFE, 0x6F, 0x2B, 0xEE, 0x6C, 0x03, 0x52}}; +/* 2*d */ +static const fe25519 ge25519_ec2d = {{0x59, 0xF1, 0xB2, 0x26, 0x94, 0x9B, 0xD6, 0xEB, 0x56, 0xB1, 0x83, 0x82, 0x9A, 0x14, 0xE0, 0x00, + 0x30, 0xD1, 0xF3, 0xEE, 0xF2, 0x80, 0x8E, 0x19, 0xE7, 0xFC, 0xDF, 0x56, 0xDC, 0xD9, 0x06, 0x24}}; +/* sqrt(-1) */ +static const fe25519 ge25519_sqrtm1 = {{0xB0, 0xA0, 0x0E, 0x4A, 0x27, 0x1B, 0xEE, 0xC4, 0x78, 0xE4, 0x2F, 0xAD, 0x06, 0x18, 0x43, 0x2F, + 0xA7, 0xD7, 0xFB, 0x3D, 0x99, 0x00, 0x4D, 0x2B, 0x0B, 0xDF, 0xC1, 0x4F, 0x80, 0x24, 0x83, 0x2B}}; + +#define ge25519_p3 ge25519 + +typedef struct +{ + fe25519 x; + fe25519 z; + fe25519 y; + fe25519 t; +} ge25519_p1p1; + +typedef struct +{ + fe25519 x; + fe25519 y; + fe25519 z; +} ge25519_p2; + +typedef struct +{ + fe25519 x; + fe25519 y; +} ge25519_aff; + + +/* Packed coordinates of the base point */ +const ge25519 ge25519_base = {{{0x1A, 0xD5, 0x25, 0x8F, 0x60, 0x2D, 0x56, 0xC9, 0xB2, 0xA7, 0x25, 0x95, 0x60, 0xC7, 0x2C, 0x69, + 0x5C, 0xDC, 0xD6, 0xFD, 0x31, 0xE2, 0xA4, 0xC0, 0xFE, 0x53, 0x6E, 0xCD, 0xD3, 0x36, 0x69, 0x21}}, + {{0x58, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, + 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66}}, + {{0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}}, + {{0xA3, 0xDD, 0xB7, 0xA5, 0xB3, 0x8A, 0xDE, 0x6D, 0xF5, 0x52, 0x51, 0x77, 0x80, 0x9F, 0xF0, 0x20, + 0x7D, 0xE3, 0xAB, 0x64, 0x8E, 0x4E, 0xEA, 0x66, 0x65, 0x76, 0x8B, 0xD7, 0x0F, 0x5F, 0x87, 0x67}}}; + +/* Multiples of the base point in affine representation */ +static const ge25519_aff ge25519_base_multiples_affine[425] = { +#include "ge25519_base.data" +}; + +static void p1p1_to_p2(ge25519_p2 *r, const ge25519_p1p1 *p) +{ + fe25519_mul(&r->x, &p->x, &p->t); + fe25519_mul(&r->y, &p->y, &p->z); + fe25519_mul(&r->z, &p->z, &p->t); +} + +static void p1p1_to_p3(ge25519_p3 *r, const ge25519_p1p1 *p) +{ + p1p1_to_p2((ge25519_p2 *)r, p); + fe25519_mul(&r->t, &p->x, &p->y); +} + +static void ge25519_mixadd2(ge25519_p3 *r, const ge25519_aff *q) +{ + fe25519 a,b,t1,t2,c,d,e,f,g,h,qt; + fe25519_mul(&qt, &q->x, &q->y); + fe25519_sub(&a, &r->y, &r->x); /* A = (Y1-X1)*(Y2-X2) */ + fe25519_add(&b, &r->y, &r->x); /* B = (Y1+X1)*(Y2+X2) */ + fe25519_sub(&t1, &q->y, &q->x); + fe25519_add(&t2, &q->y, &q->x); + fe25519_mul(&a, &a, &t1); + fe25519_mul(&b, &b, &t2); + fe25519_sub(&e, &b, &a); /* E = B-A */ + fe25519_add(&h, &b, &a); /* H = B+A */ + fe25519_mul(&c, &r->t, &qt); /* C = T1*k*T2 */ + fe25519_mul(&c, &c, &ge25519_ec2d); + fe25519_add(&d, &r->z, &r->z); /* D = Z1*2 */ + fe25519_sub(&f, &d, &c); /* F = D-C */ + fe25519_add(&g, &d, &c); /* G = D+C */ + fe25519_mul(&r->x, &e, &f); + fe25519_mul(&r->y, &h, &g); + fe25519_mul(&r->z, &g, &f); + fe25519_mul(&r->t, &e, &h); +} + +static void add_p1p1(ge25519_p1p1 *r, const ge25519_p3 *p, const ge25519_p3 *q) +{ + fe25519 a, b, c, d, t; + + fe25519_sub(&a, &p->y, &p->x); /* A = (Y1-X1)*(Y2-X2) */ + fe25519_sub(&t, &q->y, &q->x); + fe25519_mul(&a, &a, &t); + fe25519_add(&b, &p->x, &p->y); /* B = (Y1+X1)*(Y2+X2) */ + fe25519_add(&t, &q->x, &q->y); + fe25519_mul(&b, &b, &t); + fe25519_mul(&c, &p->t, &q->t); /* C = T1*k*T2 */ + fe25519_mul(&c, &c, &ge25519_ec2d); + fe25519_mul(&d, &p->z, &q->z); /* D = Z1*2*Z2 */ + fe25519_add(&d, &d, &d); + fe25519_sub(&r->x, &b, &a); /* E = B-A */ + fe25519_sub(&r->t, &d, &c); /* F = D-C */ + fe25519_add(&r->z, &d, &c); /* G = D+C */ + fe25519_add(&r->y, &b, &a); /* H = B+A */ +} + +/* See http://www.hyperelliptic.org/EFD/g1p/auto-twisted-extended-1.html#doubling-dbl-2008-hwcd */ +static void dbl_p1p1(ge25519_p1p1 *r, const ge25519_p2 *p) +{ + fe25519 a,b,c,d; + fe25519_square(&a, &p->x); + fe25519_square(&b, &p->y); + fe25519_square(&c, &p->z); + fe25519_add(&c, &c, &c); + fe25519_neg(&d, &a); + + fe25519_add(&r->x, &p->x, &p->y); + fe25519_square(&r->x, &r->x); + fe25519_sub(&r->x, &r->x, &a); + fe25519_sub(&r->x, &r->x, &b); + fe25519_add(&r->z, &d, &b); + fe25519_sub(&r->t, &r->z, &c); + fe25519_sub(&r->y, &d, &b); +} + +/* Constant-time version of: if(b) r = p */ +static void cmov_aff(ge25519_aff *r, const ge25519_aff *p, unsigned char b) +{ + fe25519_cmov(&r->x, &p->x, b); + fe25519_cmov(&r->y, &p->y, b); +} + +static unsigned char ge_equal(signed char b,signed char c) +{ + unsigned char ub = b; + unsigned char uc = c; + unsigned char x = ub ^ uc; /* 0: yes; 1..255: no */ + uint32_t y = x; /* 0: yes; 1..255: no */ + y -= 1; /* 4294967295: yes; 0..254: no */ + y >>= 31; /* 1: yes; 0: no */ + return y; +} + +static unsigned char negative(signed char b) +{ + unsigned long long x = b; /* 18446744073709551361..18446744073709551615: yes; 0..255: no */ + x >>= 63; /* 1: yes; 0: no */ + return (unsigned char)x; +} + +static void choose_t(ge25519_aff *t, unsigned long long pos, signed char b) +{ + /* constant time */ + fe25519 v; + *t = ge25519_base_multiples_affine[5*pos+0]; + cmov_aff(t, &ge25519_base_multiples_affine[5*pos+1],ge_equal(b,1) | ge_equal(b,-1)); + cmov_aff(t, &ge25519_base_multiples_affine[5*pos+2],ge_equal(b,2) | ge_equal(b,-2)); + cmov_aff(t, &ge25519_base_multiples_affine[5*pos+3],ge_equal(b,3) | ge_equal(b,-3)); + cmov_aff(t, &ge25519_base_multiples_affine[5*pos+4],ge_equal(b,-4)); + fe25519_neg(&v, &t->x); + fe25519_cmov(&t->x, &v, negative(b)); +} + +static void setneutral(ge25519 *r) +{ + fe25519_setzero(&r->x); + fe25519_setone(&r->y); + fe25519_setone(&r->z); + fe25519_setzero(&r->t); +} + +/* ******************************************************************** + * EXPORTED FUNCTIONS + ******************************************************************** */ + +/* return 0 on success, -1 otherwise */ +int ge25519_unpackneg_vartime(ge25519_p3 *r, const unsigned char p[32]) +{ + unsigned char par; + fe25519 t, chk, num, den, den2, den4, den6; + fe25519_setone(&r->z); + par = p[31] >> 7; + fe25519_unpack(&r->y, p); + fe25519_square(&num, &r->y); /* x = y^2 */ + fe25519_mul(&den, &num, &ge25519_ecd); /* den = dy^2 */ + fe25519_sub(&num, &num, &r->z); /* x = y^2-1 */ + fe25519_add(&den, &r->z, &den); /* den = dy^2+1 */ + + /* Computation of sqrt(num/den) */ + /* 1.: computation of num^((p-5)/8)*den^((7p-35)/8) = (num*den^7)^((p-5)/8) */ + fe25519_square(&den2, &den); + fe25519_square(&den4, &den2); + fe25519_mul(&den6, &den4, &den2); + fe25519_mul(&t, &den6, &num); + fe25519_mul(&t, &t, &den); + + fe25519_pow2523(&t, &t); + /* 2. computation of r->x = t * num * den^3 */ + fe25519_mul(&t, &t, &num); + fe25519_mul(&t, &t, &den); + fe25519_mul(&t, &t, &den); + fe25519_mul(&r->x, &t, &den); + + /* 3. Check whether sqrt computation gave correct result, multiply by sqrt(-1) if not: */ + fe25519_square(&chk, &r->x); + fe25519_mul(&chk, &chk, &den); + if (!fe25519_iseq_vartime(&chk, &num)) + fe25519_mul(&r->x, &r->x, &ge25519_sqrtm1); + + /* 4. Now we have one of the two square roots, except if input was not a square */ + fe25519_square(&chk, &r->x); + fe25519_mul(&chk, &chk, &den); + if (!fe25519_iseq_vartime(&chk, &num)) + return -1; + + /* 5. Choose the desired square root according to parity: */ + if(fe25519_getparity(&r->x) != (1-par)) + fe25519_neg(&r->x, &r->x); + + fe25519_mul(&r->t, &r->x, &r->y); + return 0; +} + +void ge25519_pack(unsigned char r[32], const ge25519_p3 *p) +{ + fe25519 tx, ty, zi; + fe25519_invert(&zi, &p->z); + fe25519_mul(&tx, &p->x, &zi); + fe25519_mul(&ty, &p->y, &zi); + fe25519_pack(r, &ty); + r[31] ^= fe25519_getparity(&tx) << 7; +} + +int ge25519_isneutral_vartime(const ge25519_p3 *p) +{ + int ret = 1; + if(!fe25519_iszero(&p->x)) ret = 0; + if(!fe25519_iseq_vartime(&p->y, &p->z)) ret = 0; + return ret; +} + +/* computes [s1]p1 + [s2]p2 */ +void ge25519_double_scalarmult_vartime(ge25519_p3 *r, const ge25519_p3 *p1, const sc25519 *s1, const ge25519_p3 *p2, const sc25519 *s2) +{ + ge25519_p1p1 tp1p1; + ge25519_p3 pre[16]; + unsigned char b[127]; + int i; + + /* precomputation s2 s1 */ + setneutral(pre); /* 00 00 */ + pre[1] = *p1; /* 00 01 */ + dbl_p1p1(&tp1p1,(ge25519_p2 *)p1); p1p1_to_p3( &pre[2], &tp1p1); /* 00 10 */ + add_p1p1(&tp1p1,&pre[1], &pre[2]); p1p1_to_p3( &pre[3], &tp1p1); /* 00 11 */ + pre[4] = *p2; /* 01 00 */ + add_p1p1(&tp1p1,&pre[1], &pre[4]); p1p1_to_p3( &pre[5], &tp1p1); /* 01 01 */ + add_p1p1(&tp1p1,&pre[2], &pre[4]); p1p1_to_p3( &pre[6], &tp1p1); /* 01 10 */ + add_p1p1(&tp1p1,&pre[3], &pre[4]); p1p1_to_p3( &pre[7], &tp1p1); /* 01 11 */ + dbl_p1p1(&tp1p1,(ge25519_p2 *)p2); p1p1_to_p3( &pre[8], &tp1p1); /* 10 00 */ + add_p1p1(&tp1p1,&pre[1], &pre[8]); p1p1_to_p3( &pre[9], &tp1p1); /* 10 01 */ + dbl_p1p1(&tp1p1,(ge25519_p2 *)&pre[5]); p1p1_to_p3(&pre[10], &tp1p1); /* 10 10 */ + add_p1p1(&tp1p1,&pre[3], &pre[8]); p1p1_to_p3(&pre[11], &tp1p1); /* 10 11 */ + add_p1p1(&tp1p1,&pre[4], &pre[8]); p1p1_to_p3(&pre[12], &tp1p1); /* 11 00 */ + add_p1p1(&tp1p1,&pre[1],&pre[12]); p1p1_to_p3(&pre[13], &tp1p1); /* 11 01 */ + add_p1p1(&tp1p1,&pre[2],&pre[12]); p1p1_to_p3(&pre[14], &tp1p1); /* 11 10 */ + add_p1p1(&tp1p1,&pre[3],&pre[12]); p1p1_to_p3(&pre[15], &tp1p1); /* 11 11 */ + + sc25519_2interleave2(b,s1,s2); + + /* scalar multiplication */ + *r = pre[b[126]]; + for(i=125;i>=0;i--) + { + dbl_p1p1(&tp1p1, (ge25519_p2 *)r); + p1p1_to_p2((ge25519_p2 *) r, &tp1p1); + dbl_p1p1(&tp1p1, (ge25519_p2 *)r); + if(b[i]!=0) + { + p1p1_to_p3(r, &tp1p1); + add_p1p1(&tp1p1, r, &pre[b[i]]); + } + if(i != 0) p1p1_to_p2((ge25519_p2 *)r, &tp1p1); + else p1p1_to_p3(r, &tp1p1); + } +} + +void ge25519_scalarmult_base(ge25519_p3 *r, const sc25519 *s) +{ + signed char b[85]; + int i; + ge25519_aff t; + sc25519_window3(b,s); + + choose_t((ge25519_aff *)r, 0, b[0]); + fe25519_setone(&r->z); + fe25519_mul(&r->t, &r->x, &r->y); + for(i=1;i<85;i++) + { + choose_t(&t, (unsigned long long) i, b[i]); + ge25519_mixadd2(r, &t); + } +} diff --git a/plugins/ssh-base/crypto/ge25519.h b/plugins/ssh-base/crypto/ge25519.h new file mode 100644 index 000000000..a09763760 --- /dev/null +++ b/plugins/ssh-base/crypto/ge25519.h @@ -0,0 +1,43 @@ +/* $OpenBSD: ge25519.h,v 1.4 2015/02/16 18:26:26 miod Exp $ */ + +/* + * Public Domain, Authors: Daniel J. Bernstein, Niels Duif, Tanja Lange, + * Peter Schwabe, Bo-Yin Yang. + * Copied from supercop-20130419/crypto_sign/ed25519/ref/ge25519.h + */ + +#ifndef GE25519_H +#define GE25519_H + +#include "fe25519.h" +#include "sc25519.h" + +#define ge25519 crypto_sign_ed25519_ref_ge25519 +#define ge25519_base crypto_sign_ed25519_ref_ge25519_base +#define ge25519_unpackneg_vartime crypto_sign_ed25519_ref_unpackneg_vartime +#define ge25519_pack crypto_sign_ed25519_ref_pack +#define ge25519_isneutral_vartime crypto_sign_ed25519_ref_isneutral_vartime +#define ge25519_double_scalarmult_vartime crypto_sign_ed25519_ref_double_scalarmult_vartime +#define ge25519_scalarmult_base crypto_sign_ed25519_ref_scalarmult_base + +typedef struct +{ + fe25519 x; + fe25519 y; + fe25519 z; + fe25519 t; +} ge25519; + +extern const ge25519 ge25519_base; + +int ge25519_unpackneg_vartime(ge25519 *r, const unsigned char p[32]); + +void ge25519_pack(unsigned char r[32], const ge25519 *p); + +int ge25519_isneutral_vartime(const ge25519 *p); + +void ge25519_double_scalarmult_vartime(ge25519 *r, const ge25519 *p1, const sc25519 *s1, const ge25519 *p2, const sc25519 *s2); + +void ge25519_scalarmult_base(ge25519 *r, const sc25519 *s); + +#endif diff --git a/plugins/ssh-base/crypto/ge25519_base.data b/plugins/ssh-base/crypto/ge25519_base.data new file mode 100644 index 000000000..66fb1b61c --- /dev/null +++ b/plugins/ssh-base/crypto/ge25519_base.data @@ -0,0 +1,858 @@ +/* $OpenBSD: ge25519_base.data,v 1.3 2013/12/09 11:03:45 markus Exp $ */ + +/* + * Public Domain, Authors: Daniel J. Bernstein, Niels Duif, Tanja Lange, + * Peter Schwabe, Bo-Yin Yang. + * Copied from supercop-20130419/crypto_sign/ed25519/ref/ge25519_base.data + */ + +{{{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}}, + {{0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}}}, +{{{0x1a, 0xd5, 0x25, 0x8f, 0x60, 0x2d, 0x56, 0xc9, 0xb2, 0xa7, 0x25, 0x95, 0x60, 0xc7, 0x2c, 0x69, 0x5c, 0xdc, 0xd6, 0xfd, 0x31, 0xe2, 0xa4, 0xc0, 0xfe, 0x53, 0x6e, 0xcd, 0xd3, 0x36, 0x69, 0x21}} , + {{0x58, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66}}}, +{{{0x0e, 0xce, 0x43, 0x28, 0x4e, 0xa1, 0xc5, 0x83, 0x5f, 0xa4, 0xd7, 0x15, 0x45, 0x8e, 0x0d, 0x08, 0xac, 0xe7, 0x33, 0x18, 0x7d, 0x3b, 0x04, 0x3d, 0x6c, 0x04, 0x5a, 0x9f, 0x4c, 0x38, 0xab, 0x36}} , + {{0xc9, 0xa3, 0xf8, 0x6a, 0xae, 0x46, 0x5f, 0x0e, 0x56, 0x51, 0x38, 0x64, 0x51, 0x0f, 0x39, 0x97, 0x56, 0x1f, 0xa2, 0xc9, 0xe8, 0x5e, 0xa2, 0x1d, 0xc2, 0x29, 0x23, 0x09, 0xf3, 0xcd, 0x60, 0x22}}}, +{{{0x5c, 0xe2, 0xf8, 0xd3, 0x5f, 0x48, 0x62, 0xac, 0x86, 0x48, 0x62, 0x81, 0x19, 0x98, 0x43, 0x63, 0x3a, 0xc8, 0xda, 0x3e, 0x74, 0xae, 0xf4, 0x1f, 0x49, 0x8f, 0x92, 0x22, 0x4a, 0x9c, 0xae, 0x67}} , + {{0xd4, 0xb4, 0xf5, 0x78, 0x48, 0x68, 0xc3, 0x02, 0x04, 0x03, 0x24, 0x67, 0x17, 0xec, 0x16, 0x9f, 0xf7, 0x9e, 0x26, 0x60, 0x8e, 0xa1, 0x26, 0xa1, 0xab, 0x69, 0xee, 0x77, 0xd1, 0xb1, 0x67, 0x12}}}, +{{{0x70, 0xf8, 0xc9, 0xc4, 0x57, 0xa6, 0x3a, 0x49, 0x47, 0x15, 0xce, 0x93, 0xc1, 0x9e, 0x73, 0x1a, 0xf9, 0x20, 0x35, 0x7a, 0xb8, 0xd4, 0x25, 0x83, 0x46, 0xf1, 0xcf, 0x56, 0xdb, 0xa8, 0x3d, 0x20}} , + {{0x2f, 0x11, 0x32, 0xca, 0x61, 0xab, 0x38, 0xdf, 0xf0, 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0xbf, 0xe7, 0x33, 0x8d, 0x57, 0x09, 0x91, 0x9c, 0x24, 0x08, 0x15, 0x2b, 0xe2, 0xb8, 0xee, 0x3a, 0xe5, 0x27, 0x06, 0x86, 0xa4, 0x23}} , + {{0xeb, 0x27, 0x67, 0xc1, 0x37, 0xab, 0x7a, 0xd8, 0x27, 0x9c, 0x07, 0x8e, 0xff, 0x11, 0x6a, 0xb0, 0x78, 0x6e, 0xad, 0x3a, 0x2e, 0x0f, 0x98, 0x9f, 0x72, 0xc3, 0x7f, 0x82, 0xf2, 0x96, 0x96, 0x70}}}, +{{{0x81, 0x6b, 0x88, 0xe8, 0x1e, 0xc7, 0x77, 0x96, 0x0e, 0xa1, 0xa9, 0x52, 0xe0, 0xd8, 0x0e, 0x61, 0x9e, 0x79, 0x2d, 0x95, 0x9c, 0x8d, 0x96, 0xe0, 0x06, 0x40, 0x5d, 0x87, 0x28, 0x5f, 0x98, 0x70}} , + {{0xf1, 0x79, 0x7b, 0xed, 0x4f, 0x44, 0xb2, 0xe7, 0x08, 0x0d, 0xc2, 0x08, 0x12, 0xd2, 0x9f, 0xdf, 0xcd, 0x93, 0x20, 0x8a, 0xcf, 0x33, 0xca, 0x6d, 0x89, 0xb9, 0x77, 0xc8, 0x93, 0x1b, 0x4e, 0x60}}}, +{{{0x26, 0x4f, 0x7e, 0x97, 0xf6, 0x40, 0xdd, 0x4f, 0xfc, 0x52, 0x78, 0xf9, 0x90, 0x31, 0x03, 0xe6, 0x7d, 0x56, 0x39, 0x0b, 0x1d, 0x56, 0x82, 0x85, 0xf9, 0x1a, 0x42, 0x17, 0x69, 0x6c, 0xcf, 0x39}} , + {{0x69, 0xd2, 0x06, 0x3a, 0x4f, 0x39, 0x2d, 0xf9, 0x38, 0x40, 0x8c, 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+{{{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}}, + {{0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}}}, +{{{0xc1, 0xcd, 0x90, 0x66, 0xb9, 0x76, 0xa0, 0x5b, 0xa5, 0x85, 0x75, 0x23, 0xf9, 0x89, 0xa5, 0x82, 0xb2, 0x6f, 0xb1, 0xeb, 0xc4, 0x69, 0x6f, 0x18, 0x5a, 0xed, 0x94, 0x3d, 0x9d, 0xd9, 0x2c, 0x1a}} , + {{0x35, 0xb0, 0xe6, 0x73, 0x06, 0xb7, 0x37, 0xe0, 0xf8, 0xb0, 0x22, 0xe8, 0xd2, 0xed, 0x0b, 0xef, 0xe6, 0xc6, 0x5a, 0x99, 0x9e, 0x1a, 0x9f, 0x04, 0x97, 0xe4, 0x4d, 0x0b, 0xbe, 0xba, 0x44, 0x40}}}, +{{{0xc1, 0x56, 0x96, 0x91, 0x5f, 0x1f, 0xbb, 0x54, 0x6f, 0x88, 0x89, 0x0a, 0xb2, 0xd6, 0x41, 0x42, 0x6a, 0x82, 0xee, 0x14, 0xaa, 0x76, 0x30, 0x65, 0x0f, 0x67, 0x39, 0xa6, 0x51, 0x7c, 0x49, 0x24}} , + {{0x35, 0xa3, 0x78, 0xd1, 0x11, 0x0f, 0x75, 0xd3, 0x70, 0x46, 0xdb, 0x20, 0x51, 0xcb, 0x92, 0x80, 0x54, 0x10, 0x74, 0x36, 0x86, 0xa9, 0xd7, 0xa3, 0x08, 0x78, 0xf1, 0x01, 0x29, 0xf8, 0x80, 0x3b}}}, +{{{0xdb, 0xa7, 0x9d, 0x9d, 0xbf, 0xa0, 0xcc, 0xed, 0x53, 0xa2, 0xa2, 0x19, 0x39, 0x48, 0x83, 0x19, 0x37, 0x58, 0xd1, 0x04, 0x28, 0x40, 0xf7, 0x8a, 0xc2, 0x08, 0xb7, 0xa5, 0x42, 0xcf, 0x53, 0x4c}} , + {{0xa7, 0xbb, 0xf6, 0x8e, 0xad, 0xdd, 0xf7, 0x90, 0xdd, 0x5f, 0x93, 0x89, 0xae, 0x04, 0x37, 0xe6, 0x9a, 0xb7, 0xe8, 0xc0, 0xdf, 0x16, 0x2a, 0xbf, 0xc4, 0x3a, 0x3c, 0x41, 0xd5, 0x89, 0x72, 0x5a}}}, +{{{0x1f, 0x96, 0xff, 0x34, 0x2c, 0x13, 0x21, 0xcb, 0x0a, 0x89, 0x85, 0xbe, 0xb3, 0x70, 0x9e, 0x1e, 0xde, 0x97, 0xaf, 0x96, 0x30, 0xf7, 0x48, 0x89, 0x40, 0x8d, 0x07, 0xf1, 0x25, 0xf0, 0x30, 0x58}} , + {{0x1e, 0xd4, 0x93, 0x57, 0xe2, 0x17, 0xe7, 0x9d, 0xab, 0x3c, 0x55, 0x03, 0x82, 0x2f, 0x2b, 0xdb, 0x56, 0x1e, 0x30, 0x2e, 0x24, 0x47, 0x6e, 0xe6, 0xff, 0x33, 0x24, 0x2c, 0x75, 0x51, 0xd4, 0x67}}}, +{{{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}}, + {{0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}}}, +{{{0x2b, 0x06, 0xd9, 0xa1, 0x5d, 0xe1, 0xf4, 0xd1, 0x1e, 0x3c, 0x9a, 0xc6, 0x29, 0x2b, 0x13, 0x13, 0x78, 0xc0, 0xd8, 0x16, 0x17, 0x2d, 0x9e, 0xa9, 0xc9, 0x79, 0x57, 0xab, 0x24, 0x91, 0x92, 0x19}} , + {{0x69, 0xfb, 0xa1, 0x9c, 0xa6, 0x75, 0x49, 0x7d, 0x60, 0x73, 0x40, 0x42, 0xc4, 0x13, 0x0a, 0x95, 0x79, 0x1e, 0x04, 0x83, 0x94, 0x99, 0x9b, 0x1e, 0x0c, 0xe8, 0x1f, 0x54, 0xef, 0xcb, 0xc0, 0x52}}}, +{{{0x14, 0x89, 0x73, 0xa1, 0x37, 0x87, 0x6a, 0x7a, 0xcf, 0x1d, 0xd9, 0x2e, 0x1a, 0x67, 0xed, 0x74, 0xc0, 0xf0, 0x9c, 0x33, 0xdd, 0xdf, 0x08, 0xbf, 0x7b, 0xd1, 0x66, 0xda, 0xe6, 0xc9, 0x49, 0x08}} , + {{0xe9, 0xdd, 0x5e, 0x55, 0xb0, 0x0a, 0xde, 0x21, 0x4c, 0x5a, 0x2e, 0xd4, 0x80, 0x3a, 0x57, 0x92, 0x7a, 0xf1, 0xc4, 0x2c, 0x40, 0xaf, 0x2f, 0xc9, 0x92, 0x03, 0xe5, 0x5a, 0xbc, 0xdc, 0xf4, 0x09}}}, +{{{0xf3, 0xe1, 0x2b, 0x7c, 0x05, 0x86, 0x80, 0x93, 0x4a, 0xad, 0xb4, 0x8f, 0x7e, 0x99, 0x0c, 0xfd, 0xcd, 0xef, 0xd1, 0xff, 0x2c, 0x69, 0x34, 0x13, 0x41, 0x64, 0xcf, 0x3b, 0xd0, 0x90, 0x09, 0x1e}} , + {{0x9d, 0x45, 0xd6, 0x80, 0xe6, 0x45, 0xaa, 0xf4, 0x15, 0xaa, 0x5c, 0x34, 0x87, 0x99, 0xa2, 0x8c, 0x26, 0x84, 0x62, 0x7d, 0xb6, 0x29, 0xc0, 0x52, 0xea, 0xf5, 0x81, 0x18, 0x0f, 0x35, 0xa9, 0x0e}}}, +{{{0xe7, 0x20, 0x72, 0x7c, 0x6d, 0x94, 0x5f, 0x52, 0x44, 0x54, 0xe3, 0xf1, 0xb2, 0xb0, 0x36, 0x46, 0x0f, 0xae, 0x92, 0xe8, 0x70, 0x9d, 0x6e, 0x79, 0xb1, 0xad, 0x37, 0xa9, 0x5f, 0xc0, 0xde, 0x03}} , + {{0x15, 0x55, 0x37, 0xc6, 0x1c, 0x27, 0x1c, 0x6d, 0x14, 0x4f, 0xca, 0xa4, 0xc4, 0x88, 0x25, 0x46, 0x39, 0xfc, 0x5a, 0xe5, 0xfe, 0x29, 0x11, 0x69, 0xf5, 0x72, 0x84, 0x4d, 0x78, 0x9f, 0x94, 0x15}}}, +{{{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}}, + {{0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}}}, +{{{0xec, 0xd3, 0xff, 0x57, 0x0b, 0xb0, 0xb2, 0xdc, 0xf8, 0x4f, 0xe2, 0x12, 0xd5, 0x36, 0xbe, 0x6b, 0x09, 0x43, 0x6d, 0xa3, 0x4d, 0x90, 0x2d, 0xb8, 0x74, 0xe8, 0x71, 0x45, 0x19, 0x8b, 0x0c, 0x6a}} , + {{0xb8, 0x42, 0x1c, 0x03, 0xad, 0x2c, 0x03, 0x8e, 0xac, 0xd7, 0x98, 0x29, 0x13, 0xc6, 0x02, 0x29, 0xb5, 0xd4, 0xe7, 0xcf, 0xcc, 0x8b, 0x83, 0xec, 0x35, 0xc7, 0x9c, 0x74, 0xb7, 0xad, 0x85, 0x5f}}}, +{{{0x78, 0x84, 0xe1, 0x56, 0x45, 0x69, 0x68, 0x5a, 0x4f, 0xb8, 0xb1, 0x29, 0xff, 0x33, 0x03, 0x31, 0xb7, 0xcb, 0x96, 0x25, 0xe6, 0xe6, 0x41, 0x98, 0x1a, 0xbb, 0x03, 0x56, 0xf2, 0xb2, 0x91, 0x34}} , + {{0x2c, 0x6c, 0xf7, 0x66, 0xa4, 0x62, 0x6b, 0x39, 0xb3, 0xba, 0x65, 0xd3, 0x1c, 0xf8, 0x11, 0xaa, 0xbe, 0xdc, 0x80, 0x59, 0x87, 0xf5, 0x7b, 0xe5, 0xe3, 0xb3, 0x3e, 0x39, 0xda, 0xbe, 0x88, 0x09}}}, +{{{0x8b, 0xf1, 0xa0, 0xf5, 0xdc, 0x29, 0xb4, 0xe2, 0x07, 0xc6, 0x7a, 0x00, 0xd0, 0x89, 0x17, 0x51, 0xd4, 0xbb, 0xd4, 0x22, 0xea, 0x7e, 0x7d, 0x7c, 0x24, 0xea, 0xf2, 0xe8, 0x22, 0x12, 0x95, 0x06}} , + {{0xda, 0x7c, 0xa4, 0x0c, 0xf4, 0xba, 0x6e, 0xe1, 0x89, 0xb5, 0x59, 0xca, 0xf1, 0xc0, 0x29, 0x36, 0x09, 0x44, 0xe2, 0x7f, 0xd1, 0x63, 0x15, 0x99, 0xea, 0x25, 0xcf, 0x0c, 0x9d, 0xc0, 0x44, 0x6f}}}, +{{{0x1d, 0x86, 0x4e, 0xcf, 0xf7, 0x37, 0x10, 0x25, 0x8f, 0x12, 0xfb, 0x19, 0xfb, 0xe0, 0xed, 0x10, 0xc8, 0xe2, 0xf5, 0x75, 0xb1, 0x33, 0xc0, 0x96, 0x0d, 0xfb, 0x15, 0x6c, 0x0d, 0x07, 0x5f, 0x05}} , + {{0x69, 0x3e, 0x47, 0x97, 0x2c, 0xaf, 0x52, 0x7c, 0x78, 0x83, 0xad, 0x1b, 0x39, 0x82, 0x2f, 0x02, 0x6f, 0x47, 0xdb, 0x2a, 0xb0, 0xe1, 0x91, 0x99, 0x55, 0xb8, 0x99, 0x3a, 0xa0, 0x44, 0x11, 0x51}}} diff --git a/plugins/ssh-base/crypto/poly1305.c b/plugins/ssh-base/crypto/poly1305.c new file mode 100644 index 000000000..65426673c --- /dev/null +++ b/plugins/ssh-base/crypto/poly1305.c @@ -0,0 +1,172 @@ +/* + * Public Domain poly1305 from Andrew Moon + * poly1305-donna-unrolled.c from https://github.com/floodyberry/poly1305-donna + */ + +/* $OpenBSD: poly1305.c,v 1.3 2013/12/19 22:57:13 djm Exp $ */ + +#include +#include "lws-ssh.h" + +#define mul32x32_64(a,b) ((uint64_t)(a) * (b)) + +#define U8TO32_LE(p) \ + (((uint32_t)((p)[0])) | \ + ((uint32_t)((p)[1]) << 8) | \ + ((uint32_t)((p)[2]) << 16) | \ + ((uint32_t)((p)[3]) << 24)) + +#define U32TO8_LE(p, v) \ + do { \ + (p)[0] = (uint8_t)((v)); \ + (p)[1] = (uint8_t)((v) >> 8); \ + (p)[2] = (uint8_t)((v) >> 16); \ + (p)[3] = (uint8_t)((v) >> 24); \ + } while (0) + +void +poly1305_auth(unsigned char out[POLY1305_TAGLEN], + const unsigned char *m, size_t inlen, + const unsigned char key[POLY1305_KEYLEN]) +{ + uint32_t t0,t1,t2,t3; + uint32_t h0,h1,h2,h3,h4; + uint32_t r0,r1,r2,r3,r4; + uint32_t s1,s2,s3,s4; + uint32_t b, nb; + size_t j; + uint64_t t[5]; + uint64_t f0,f1,f2,f3; + uint32_t g0,g1,g2,g3,g4; + uint64_t c; + unsigned char mp[16]; + + /* clamp key */ + t0 = U8TO32_LE(key + 0); + t1 = U8TO32_LE(key + 4); + t2 = U8TO32_LE(key + 8); + t3 = U8TO32_LE(key + 12); + + /* precompute multipliers */ + r0 = t0 & 0x3ffffff; t0 >>= 26; t0 |= t1 << 6; + r1 = t0 & 0x3ffff03; t1 >>= 20; t1 |= t2 << 12; + r2 = t1 & 0x3ffc0ff; t2 >>= 14; t2 |= t3 << 18; + r3 = t2 & 0x3f03fff; t3 >>= 8; + r4 = t3 & 0x00fffff; + + s1 = r1 * 5; + s2 = r2 * 5; + s3 = r3 * 5; + s4 = r4 * 5; + + /* init state */ + h0 = 0; + h1 = 0; + h2 = 0; + h3 = 0; + h4 = 0; + + /* full blocks */ + if (inlen < 16) + goto poly1305_donna_atmost15bytes; + +poly1305_donna_16bytes: + m += 16; + inlen -= 16; + + t0 = U8TO32_LE(m - 16); + t1 = U8TO32_LE(m - 12); + t2 = U8TO32_LE(m - 8); + t3 = U8TO32_LE(m - 4); + + h0 += t0 & 0x3ffffff; + h1 += ((((uint64_t)t1 << 32) | t0) >> 26) & 0x3ffffff; + h2 += ((((uint64_t)t2 << 32) | t1) >> 20) & 0x3ffffff; + h3 += ((((uint64_t)t3 << 32) | t2) >> 14) & 0x3ffffff; + h4 += (t3 >> 8) | (1 << 24); + +poly1305_donna_mul: + t[0] = mul32x32_64(h0,r0) + mul32x32_64(h1,s4) + + mul32x32_64(h2,s3) + mul32x32_64(h3,s2) + + mul32x32_64(h4,s1); + t[1] = mul32x32_64(h0,r1) + mul32x32_64(h1,r0) + + mul32x32_64(h2,s4) + mul32x32_64(h3,s3) + + mul32x32_64(h4,s2); + t[2] = mul32x32_64(h0,r2) + mul32x32_64(h1,r1) + + mul32x32_64(h2,r0) + mul32x32_64(h3,s4) + + mul32x32_64(h4,s3); + t[3] = mul32x32_64(h0,r3) + mul32x32_64(h1,r2) + + mul32x32_64(h2,r1) + mul32x32_64(h3,r0) + + mul32x32_64(h4,s4); + t[4] = mul32x32_64(h0,r4) + mul32x32_64(h1,r3) + + mul32x32_64(h2,r2) + mul32x32_64(h3,r1) + + mul32x32_64(h4,r0); + + h0 = (uint32_t)t[0] & 0x3ffffff; c = (t[0] >> 26); + t[1] += c; h1 = (uint32_t)t[1] & 0x3ffffff; b = (uint32_t)(t[1] >> 26); + t[2] += b; h2 = (uint32_t)t[2] & 0x3ffffff; b = (uint32_t)(t[2] >> 26); + t[3] += b; h3 = (uint32_t)t[3] & 0x3ffffff; b = (uint32_t)(t[3] >> 26); + t[4] += b; h4 = (uint32_t)t[4] & 0x3ffffff; b = (uint32_t)(t[4] >> 26); + h0 += b * 5; + + if (inlen >= 16) + goto poly1305_donna_16bytes; + + /* final bytes */ +poly1305_donna_atmost15bytes: + if (!inlen) + goto poly1305_donna_finish; + + for (j = 0; j < inlen; j++) + mp[j] = m[j]; + mp[j++] = 1; + for (; j < 16; j++) + mp[j] = 0; + inlen = 0; + + t0 = U8TO32_LE(mp + 0); + t1 = U8TO32_LE(mp + 4); + t2 = U8TO32_LE(mp + 8); + t3 = U8TO32_LE(mp + 12); + + h0 += t0 & 0x3ffffff; + h1 += ((((uint64_t)t1 << 32) | t0) >> 26) & 0x3ffffff; + h2 += ((((uint64_t)t2 << 32) | t1) >> 20) & 0x3ffffff; + h3 += ((((uint64_t)t3 << 32) | t2) >> 14) & 0x3ffffff; + h4 += (t3 >> 8); + + goto poly1305_donna_mul; + +poly1305_donna_finish: + b = h0 >> 26; h0 = h0 & 0x3ffffff; + h1 += b; b = h1 >> 26; h1 = h1 & 0x3ffffff; + h2 += b; b = h2 >> 26; h2 = h2 & 0x3ffffff; + h3 += b; b = h3 >> 26; h3 = h3 & 0x3ffffff; + h4 += b; b = h4 >> 26; h4 = h4 & 0x3ffffff; + h0 += b * 5; b = h0 >> 26; h0 = h0 & 0x3ffffff; + h1 += b; + + g0 = h0 + 5; b = g0 >> 26; g0 &= 0x3ffffff; + g1 = h1 + b; b = g1 >> 26; g1 &= 0x3ffffff; + g2 = h2 + b; b = g2 >> 26; g2 &= 0x3ffffff; + g3 = h3 + b; b = g3 >> 26; g3 &= 0x3ffffff; + g4 = h4 + b - (1 << 26); + + b = (g4 >> 31) - 1; + nb = ~b; + h0 = (h0 & nb) | (g0 & b); + h1 = (h1 & nb) | (g1 & b); + h2 = (h2 & nb) | (g2 & b); + h3 = (h3 & nb) | (g3 & b); + h4 = (h4 & nb) | (g4 & b); + + f0 = ((h0 ) | (h1 << 26)) + (uint64_t)U8TO32_LE(&key[16]); + f1 = ((h1 >> 6) | (h2 << 20)) + (uint64_t)U8TO32_LE(&key[20]); + f2 = ((h2 >> 12) | (h3 << 14)) + (uint64_t)U8TO32_LE(&key[24]); + f3 = ((h3 >> 18) | (h4 << 8)) + (uint64_t)U8TO32_LE(&key[28]); + + U32TO8_LE(&out[ 0], f0); f1 += (f0 >> 32); + U32TO8_LE(&out[ 4], f1); f2 += (f1 >> 32); + U32TO8_LE(&out[ 8], f2); f3 += (f2 >> 32); + U32TO8_LE(&out[12], f3); +} diff --git a/plugins/ssh-base/crypto/sc25519.c b/plugins/ssh-base/crypto/sc25519.c new file mode 100644 index 000000000..072fff3c6 --- /dev/null +++ b/plugins/ssh-base/crypto/sc25519.c @@ -0,0 +1,308 @@ +/* $OpenBSD: sc25519.c,v 1.3 2013/12/09 11:03:45 markus Exp $ */ + +/* + * Public Domain, Authors: Daniel J. Bernstein, Niels Duif, Tanja Lange, + * Peter Schwabe, Bo-Yin Yang. + * Copied from supercop-20130419/crypto_sign/ed25519/ref/sc25519.c + */ + +#include + +#include "sc25519.h" + +/*Arithmetic modulo the group order m = 2^252 + 27742317777372353535851937790883648493 = 7237005577332262213973186563042994240857116359379907606001950938285454250989 */ + +static const uint32_t m[32] = {0xED, 0xD3, 0xF5, 0x5C, 0x1A, 0x63, 0x12, 0x58, 0xD6, 0x9C, 0xF7, 0xA2, 0xDE, 0xF9, 0xDE, 0x14, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10}; + +static const uint32_t mu[33] = {0x1B, 0x13, 0x2C, 0x0A, 0xA3, 0xE5, 0x9C, 0xED, 0xA7, 0x29, 0x63, 0x08, 0x5D, 0x21, 0x06, 0x21, + 0xEB, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x0F}; + +static uint32_t lt(uint32_t a,uint32_t b) /* 16-bit inputs */ +{ + unsigned int x = a; + x -= (unsigned int) b; /* 0..65535: no; 4294901761..4294967295: yes */ + x >>= 31; /* 0: no; 1: yes */ + return x; +} + +/* Reduce coefficients of r before calling sc_reduce_add_sub */ +static void sc_reduce_add_sub(sc25519 *r) +{ + uint32_t pb = 0; + uint32_t b; + uint32_t mask; + int i; + unsigned char t[32]; + + for(i=0;i<32;i++) + { + pb += m[i]; + b = lt(r->v[i],pb); + t[i] = r->v[i]-pb+(b<<8); + pb = b; + } + mask = b - 1; + for(i=0;i<32;i++) + r->v[i] ^= mask & (r->v[i] ^ t[i]); +} + +/* Reduce coefficients of x before calling barrett_reduce */ +static void barrett_reduce(sc25519 *r, const uint32_t x[64]) +{ + /* See HAC, Alg. 14.42 */ + int i,j; + uint32_t q2[66]; + uint32_t *q3 = q2 + 33; + uint32_t r1[33]; + uint32_t r2[33]; + uint32_t carry; + uint32_t pb = 0; + uint32_t b; + + for (i = 0;i < 66;++i) q2[i] = 0; + for (i = 0;i < 33;++i) r2[i] = 0; + + for(i=0;i<33;i++) + for(j=0;j<33;j++) + if(i+j >= 31) q2[i+j] += mu[i]*x[j+31]; + carry = q2[31] >> 8; + q2[32] += carry; + carry = q2[32] >> 8; + q2[33] += carry; + + for(i=0;i<33;i++)r1[i] = x[i]; + for(i=0;i<32;i++) + for(j=0;j<33;j++) + if(i+j < 33) r2[i+j] += m[i]*q3[j]; + + for(i=0;i<32;i++) + { + carry = r2[i] >> 8; + r2[i+1] += carry; + r2[i] &= 0xff; + } + + for(i=0;i<32;i++) + { + pb += r2[i]; + b = lt(r1[i],pb); + r->v[i] = r1[i]-pb+(b<<8); + pb = b; + } + + /* XXX: Can it really happen that r<0?, See HAC, Alg 14.42, Step 3 + * If so: Handle it here! + */ + + sc_reduce_add_sub(r); + sc_reduce_add_sub(r); +} + +void sc25519_from32bytes(sc25519 *r, const unsigned char x[32]) +{ + int i; + uint32_t t[64]; + for(i=0;i<32;i++) t[i] = x[i]; + for(i=32;i<64;++i) t[i] = 0; + barrett_reduce(r, t); +} + +void shortsc25519_from16bytes(shortsc25519 *r, const unsigned char x[16]) +{ + int i; + for(i=0;i<16;i++) r->v[i] = x[i]; +} + +void sc25519_from64bytes(sc25519 *r, const unsigned char x[64]) +{ + int i; + uint32_t t[64]; + for(i=0;i<64;i++) t[i] = x[i]; + barrett_reduce(r, t); +} + +void sc25519_from_shortsc(sc25519 *r, const shortsc25519 *x) +{ + int i; + for(i=0;i<16;i++) + r->v[i] = x->v[i]; + for(i=0;i<16;i++) + r->v[16+i] = 0; +} + +void sc25519_to32bytes(unsigned char r[32], const sc25519 *x) +{ + int i; + for(i=0;i<32;i++) r[i] = x->v[i]; +} + +int sc25519_iszero_vartime(const sc25519 *x) +{ + int i; + for(i=0;i<32;i++) + if(x->v[i] != 0) return 0; + return 1; +} + +int sc25519_isshort_vartime(const sc25519 *x) +{ + int i; + for(i=31;i>15;i--) + if(x->v[i] != 0) return 0; + return 1; +} + +int sc25519_lt_vartime(const sc25519 *x, const sc25519 *y) +{ + int i; + for(i=31;i>=0;i--) + { + if(x->v[i] < y->v[i]) return 1; + if(x->v[i] > y->v[i]) return 0; + } + return 0; +} + +void sc25519_add(sc25519 *r, const sc25519 *x, const sc25519 *y) +{ + int i, carry; + for(i=0;i<32;i++) r->v[i] = x->v[i] + y->v[i]; + for(i=0;i<31;i++) + { + carry = r->v[i] >> 8; + r->v[i+1] += carry; + r->v[i] &= 0xff; + } + sc_reduce_add_sub(r); +} + +void sc25519_sub_nored(sc25519 *r, const sc25519 *x, const sc25519 *y) +{ + uint32_t b = 0; + uint32_t t; + int i; + for(i=0;i<32;i++) + { + t = x->v[i] - y->v[i] - b; + r->v[i] = t & 255; + b = (t >> 8) & 1; + } +} + +void sc25519_mul(sc25519 *r, const sc25519 *x, const sc25519 *y) +{ + int i,j,carry; + uint32_t t[64]; + for(i=0;i<64;i++)t[i] = 0; + + for(i=0;i<32;i++) + for(j=0;j<32;j++) + t[i+j] += x->v[i] * y->v[j]; + + /* Reduce coefficients */ + for(i=0;i<63;i++) + { + carry = t[i] >> 8; + t[i+1] += carry; + t[i] &= 0xff; + } + + barrett_reduce(r, t); +} + +void sc25519_mul_shortsc(sc25519 *r, const sc25519 *x, const shortsc25519 *y) +{ + sc25519 t; + sc25519_from_shortsc(&t, y); + sc25519_mul(r, x, &t); +} + +void sc25519_window3(signed char r[85], const sc25519 *s) +{ + char carry; + int i; + for(i=0;i<10;i++) + { + r[8*i+0] = s->v[3*i+0] & 7; + r[8*i+1] = (s->v[3*i+0] >> 3) & 7; + r[8*i+2] = (s->v[3*i+0] >> 6) & 7; + r[8*i+2] ^= (s->v[3*i+1] << 2) & 7; + r[8*i+3] = (s->v[3*i+1] >> 1) & 7; + r[8*i+4] = (s->v[3*i+1] >> 4) & 7; + r[8*i+5] = (s->v[3*i+1] >> 7) & 7; + r[8*i+5] ^= (s->v[3*i+2] << 1) & 7; + r[8*i+6] = (s->v[3*i+2] >> 2) & 7; + r[8*i+7] = (s->v[3*i+2] >> 5) & 7; + } + r[8*i+0] = s->v[3*i+0] & 7; + r[8*i+1] = (s->v[3*i+0] >> 3) & 7; + r[8*i+2] = (s->v[3*i+0] >> 6) & 7; + r[8*i+2] ^= (s->v[3*i+1] << 2) & 7; + r[8*i+3] = (s->v[3*i+1] >> 1) & 7; + r[8*i+4] = (s->v[3*i+1] >> 4) & 7; + + /* Making it signed */ + carry = 0; + for(i=0;i<84;i++) + { + r[i] += carry; + r[i+1] += r[i] >> 3; + r[i] &= 7; + carry = r[i] >> 2; + r[i] -= carry<<3; + } + r[84] += carry; +} + +void sc25519_window5(signed char r[51], const sc25519 *s) +{ + char carry; + int i; + for(i=0;i<6;i++) + { + r[8*i+0] = s->v[5*i+0] & 31; + r[8*i+1] = (s->v[5*i+0] >> 5) & 31; + r[8*i+1] ^= (s->v[5*i+1] << 3) & 31; + r[8*i+2] = (s->v[5*i+1] >> 2) & 31; + r[8*i+3] = (s->v[5*i+1] >> 7) & 31; + r[8*i+3] ^= (s->v[5*i+2] << 1) & 31; + r[8*i+4] = (s->v[5*i+2] >> 4) & 31; + r[8*i+4] ^= (s->v[5*i+3] << 4) & 31; + r[8*i+5] = (s->v[5*i+3] >> 1) & 31; + r[8*i+6] = (s->v[5*i+3] >> 6) & 31; + r[8*i+6] ^= (s->v[5*i+4] << 2) & 31; + r[8*i+7] = (s->v[5*i+4] >> 3) & 31; + } + r[8*i+0] = s->v[5*i+0] & 31; + r[8*i+1] = (s->v[5*i+0] >> 5) & 31; + r[8*i+1] ^= (s->v[5*i+1] << 3) & 31; + r[8*i+2] = (s->v[5*i+1] >> 2) & 31; + + /* Making it signed */ + carry = 0; + for(i=0;i<50;i++) + { + r[i] += carry; + r[i+1] += r[i] >> 5; + r[i] &= 31; + carry = r[i] >> 4; + r[i] -= carry<<5; + } + r[50] += carry; +} + +void sc25519_2interleave2(unsigned char r[127], const sc25519 *s1, const sc25519 *s2) +{ + int i; + for(i=0;i<31;i++) + { + r[4*i] = ( s1->v[i] & 3) ^ (( s2->v[i] & 3) << 2); + r[4*i+1] = ((s1->v[i] >> 2) & 3) ^ (((s2->v[i] >> 2) & 3) << 2); + r[4*i+2] = ((s1->v[i] >> 4) & 3) ^ (((s2->v[i] >> 4) & 3) << 2); + r[4*i+3] = ((s1->v[i] >> 6) & 3) ^ (((s2->v[i] >> 6) & 3) << 2); + } + r[124] = ( s1->v[31] & 3) ^ (( s2->v[31] & 3) << 2); + r[125] = ((s1->v[31] >> 2) & 3) ^ (((s2->v[31] >> 2) & 3) << 2); + r[126] = ((s1->v[31] >> 4) & 3) ^ (((s2->v[31] >> 4) & 3) << 2); +} diff --git a/plugins/ssh-base/crypto/sc25519.h b/plugins/ssh-base/crypto/sc25519.h new file mode 100644 index 000000000..dace1a17e --- /dev/null +++ b/plugins/ssh-base/crypto/sc25519.h @@ -0,0 +1,78 @@ +/* $OpenBSD: sc25519.h,v 1.3 2013/12/09 11:03:45 markus Exp $ */ + +/* + * Public Domain, Authors: Daniel J. Bernstein, Niels Duif, Tanja Lange, + * Peter Schwabe, Bo-Yin Yang. + * Copied from supercop-20130419/crypto_sign/ed25519/ref/sc25519.h + */ + +#ifndef SC25519_H +#define SC25519_H + +#define sc25519 crypto_sign_ed25519_ref_sc25519 +#define shortsc25519 crypto_sign_ed25519_ref_shortsc25519 +#define sc25519_from32bytes crypto_sign_ed25519_ref_sc25519_from32bytes +#define shortsc25519_from16bytes crypto_sign_ed25519_ref_shortsc25519_from16bytes +#define sc25519_from64bytes crypto_sign_ed25519_ref_sc25519_from64bytes +#define sc25519_from_shortsc crypto_sign_ed25519_ref_sc25519_from_shortsc +#define sc25519_to32bytes crypto_sign_ed25519_ref_sc25519_to32bytes +#define sc25519_iszero_vartime crypto_sign_ed25519_ref_sc25519_iszero_vartime +#define sc25519_isshort_vartime crypto_sign_ed25519_ref_sc25519_isshort_vartime +#define sc25519_lt_vartime crypto_sign_ed25519_ref_sc25519_lt_vartime +#define sc25519_add crypto_sign_ed25519_ref_sc25519_add +#define sc25519_sub_nored crypto_sign_ed25519_ref_sc25519_sub_nored +#define sc25519_mul crypto_sign_ed25519_ref_sc25519_mul +#define sc25519_mul_shortsc crypto_sign_ed25519_ref_sc25519_mul_shortsc +#define sc25519_window3 crypto_sign_ed25519_ref_sc25519_window3 +#define sc25519_window5 crypto_sign_ed25519_ref_sc25519_window5 +#define sc25519_2interleave2 crypto_sign_ed25519_ref_sc25519_2interleave2 + +typedef struct +{ + uint32_t v[32]; +} +sc25519; + +typedef struct +{ + uint32_t v[16]; +} +shortsc25519; + +void sc25519_from32bytes(sc25519 *r, const unsigned char x[32]); + +void shortsc25519_from16bytes(shortsc25519 *r, const unsigned char x[16]); + +void sc25519_from64bytes(sc25519 *r, const unsigned char x[64]); + +void sc25519_from_shortsc(sc25519 *r, const shortsc25519 *x); + +void sc25519_to32bytes(unsigned char r[32], const sc25519 *x); + +int sc25519_iszero_vartime(const sc25519 *x); + +int sc25519_isshort_vartime(const sc25519 *x); + +int sc25519_lt_vartime(const sc25519 *x, const sc25519 *y); + +void sc25519_add(sc25519 *r, const sc25519 *x, const sc25519 *y); + +void sc25519_sub_nored(sc25519 *r, const sc25519 *x, const sc25519 *y); + +void sc25519_mul(sc25519 *r, const sc25519 *x, const sc25519 *y); + +void sc25519_mul_shortsc(sc25519 *r, const sc25519 *x, const shortsc25519 *y); + +/* Convert s into a representation of the form \sum_{i=0}^{84}r[i]2^3 + * with r[i] in {-4,...,3} + */ +void sc25519_window3(signed char r[85], const sc25519 *s); + +/* Convert s into a representation of the form \sum_{i=0}^{50}r[i]2^5 + * with r[i] in {-16,...,15} + */ +void sc25519_window5(signed char r[51], const sc25519 *s); + +void sc25519_2interleave2(unsigned char r[127], const sc25519 *s1, const sc25519 *s2); + +#endif diff --git a/plugins/ssh-base/crypto/smult_curve25519_ref.c b/plugins/ssh-base/crypto/smult_curve25519_ref.c new file mode 100644 index 000000000..c514c8b85 --- /dev/null +++ b/plugins/ssh-base/crypto/smult_curve25519_ref.c @@ -0,0 +1,265 @@ +/* $OpenBSD: smult_curve25519_ref.c,v 1.2 2013/11/02 22:02:14 markus Exp $ */ +/* +version 20081011 +Matthew Dempsky +Public domain. +Derived from public domain code by D. J. Bernstein. +*/ + +static void add(unsigned int out[32],const unsigned int a[32],const unsigned int b[32]) +{ + unsigned int j; + unsigned int u; + u = 0; + for (j = 0;j < 31;++j) { u += a[j] + b[j]; out[j] = u & 255; u >>= 8; } + u += a[31] + b[31]; out[31] = u; +} + +static void sub(unsigned int out[32],const unsigned int a[32],const unsigned int b[32]) +{ + unsigned int j; + unsigned int u; + u = 218; + for (j = 0;j < 31;++j) { + u += a[j] + 65280 - b[j]; + out[j] = u & 255; + u >>= 8; + } + u += a[31] - b[31]; + out[31] = u; +} + +static void squeeze(unsigned int a[32]) +{ + unsigned int j; + unsigned int u; + u = 0; + for (j = 0;j < 31;++j) { u += a[j]; a[j] = u & 255; u >>= 8; } + u += a[31]; a[31] = u & 127; + u = 19 * (u >> 7); + for (j = 0;j < 31;++j) { u += a[j]; a[j] = u & 255; u >>= 8; } + u += a[31]; a[31] = u; +} + +static const unsigned int minusp[32] = { + 19, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128 +} ; + +static void freeze(unsigned int a[32]) +{ + unsigned int aorig[32]; + unsigned int j; + unsigned int negative; + + for (j = 0;j < 32;++j) aorig[j] = a[j]; + add(a,a,minusp); + negative = -(int)((a[31] >> 7) & 1); + for (j = 0;j < 32;++j) a[j] ^= negative & (aorig[j] ^ a[j]); +} + +static void mult(unsigned int out[32],const unsigned int a[32],const unsigned int b[32]) +{ + unsigned int i; + unsigned int j; + unsigned int u; + + for (i = 0;i < 32;++i) { + u = 0; + for (j = 0;j <= i;++j) u += a[j] * b[i - j]; + for (j = i + 1;j < 32;++j) u += 38 * a[j] * b[i + 32 - j]; + out[i] = u; + } + squeeze(out); +} + +static void mult121665(unsigned int out[32],const unsigned int a[32]) +{ + unsigned int j; + unsigned int u; + + u = 0; + for (j = 0;j < 31;++j) { u += 121665 * a[j]; out[j] = u & 255; u >>= 8; } + u += 121665 * a[31]; out[31] = u & 127; + u = 19 * (u >> 7); + for (j = 0;j < 31;++j) { u += out[j]; out[j] = u & 255; u >>= 8; } + u += out[j]; out[j] = u; +} + +static void square(unsigned int out[32],const unsigned int a[32]) +{ + unsigned int i; + unsigned int j; + unsigned int u; + + for (i = 0;i < 32;++i) { + u = 0; + for (j = 0;j < i - j;++j) u += a[j] * a[i - j]; + for (j = i + 1;j < i + 32 - j;++j) + if (i + 32 - j < 32 && j < 32) + u += 38 * a[j] * a[i + 32 - j]; + u *= 2; + if ((i & 1) == 0) { + u += a[i / 2] * a[i / 2]; + u += 38 * a[i / 2 + 16] * a[i / 2 + 16]; + } + out[i] = u; + } + squeeze(out); +} + +static void smc_select(unsigned int p[64],unsigned int q[64],const unsigned int r[64],const unsigned int s[64],unsigned int b) +{ + unsigned int j; + unsigned int t; + unsigned int bminus1; + + bminus1 = b - 1; + for (j = 0;j < 64;++j) { + t = bminus1 & (r[j] ^ s[j]); + p[j] = s[j] ^ t; + q[j] = r[j] ^ t; + } +} + +static void mainloop(unsigned int work[64],const unsigned char e[32]) +{ + unsigned int xzm1[64]; + unsigned int xzm[64]; + unsigned int xzmb[64]; + unsigned int xzm1b[64]; + unsigned int xznb[64]; + unsigned int xzn1b[64]; + unsigned int a0[64]; + unsigned int a1[64]; + unsigned int b0[64]; + unsigned int b1[64]; + unsigned int c1[64]; + unsigned int r[32]; + unsigned int s[32]; + unsigned int t[32]; + unsigned int u[32]; + unsigned int j; + unsigned int b; + int pos; + + for (j = 0;j < 32;++j) xzm1[j] = work[j]; + xzm1[32] = 1; + for (j = 33;j < 64;++j) xzm1[j] = 0; + + xzm[0] = 1; + for (j = 1;j < 64;++j) xzm[j] = 0; + + for (pos = 254;pos >= 0;--pos) { + b = e[pos / 8] >> (pos & 7); + b &= 1; + smc_select(xzmb,xzm1b,xzm,xzm1,b); + add(a0,xzmb,xzmb + 32); + sub(a0 + 32,xzmb,xzmb + 32); + add(a1,xzm1b,xzm1b + 32); + sub(a1 + 32,xzm1b,xzm1b + 32); + square(b0,a0); + square(b0 + 32,a0 + 32); + mult(b1,a1,a0 + 32); + mult(b1 + 32,a1 + 32,a0); + add(c1,b1,b1 + 32); + sub(c1 + 32,b1,b1 + 32); + square(r,c1 + 32); + sub(s,b0,b0 + 32); + mult121665(t,s); + add(u,t,b0); + mult(xznb,b0,b0 + 32); + mult(xznb + 32,s,u); + square(xzn1b,c1); + mult(xzn1b + 32,r,work); + smc_select(xzm,xzm1,xznb,xzn1b,b); + } + + for (j = 0;j < 64;++j) work[j] = xzm[j]; +} + +static void recip(unsigned int out[32],const unsigned int z[32]) +{ + unsigned int z2[32]; + unsigned int z9[32]; + unsigned int z11[32]; + unsigned int z2_5_0[32]; + unsigned int z2_10_0[32]; + unsigned int z2_20_0[32]; + unsigned int z2_50_0[32]; + unsigned int z2_100_0[32]; + unsigned int t0[32]; + unsigned int t1[32]; + int i; + + /* 2 */ square(z2,z); + /* 4 */ square(t1,z2); + /* 8 */ square(t0,t1); + /* 9 */ mult(z9,t0,z); + /* 11 */ mult(z11,z9,z2); + /* 22 */ square(t0,z11); + /* 2^5 - 2^0 = 31 */ mult(z2_5_0,t0,z9); + + /* 2^6 - 2^1 */ square(t0,z2_5_0); + /* 2^7 - 2^2 */ square(t1,t0); + /* 2^8 - 2^3 */ square(t0,t1); + /* 2^9 - 2^4 */ square(t1,t0); + /* 2^10 - 2^5 */ square(t0,t1); + /* 2^10 - 2^0 */ mult(z2_10_0,t0,z2_5_0); + + /* 2^11 - 2^1 */ square(t0,z2_10_0); + /* 2^12 - 2^2 */ square(t1,t0); + /* 2^20 - 2^10 */ for (i = 2;i < 10;i += 2) { square(t0,t1); square(t1,t0); } + /* 2^20 - 2^0 */ mult(z2_20_0,t1,z2_10_0); + + /* 2^21 - 2^1 */ square(t0,z2_20_0); + /* 2^22 - 2^2 */ square(t1,t0); + /* 2^40 - 2^20 */ for (i = 2;i < 20;i += 2) { square(t0,t1); square(t1,t0); } + /* 2^40 - 2^0 */ mult(t0,t1,z2_20_0); + + /* 2^41 - 2^1 */ square(t1,t0); + /* 2^42 - 2^2 */ square(t0,t1); + /* 2^50 - 2^10 */ for (i = 2;i < 10;i += 2) { square(t1,t0); square(t0,t1); } + /* 2^50 - 2^0 */ mult(z2_50_0,t0,z2_10_0); + + /* 2^51 - 2^1 */ square(t0,z2_50_0); + /* 2^52 - 2^2 */ square(t1,t0); + /* 2^100 - 2^50 */ for (i = 2;i < 50;i += 2) { square(t0,t1); square(t1,t0); } + /* 2^100 - 2^0 */ mult(z2_100_0,t1,z2_50_0); + + /* 2^101 - 2^1 */ square(t1,z2_100_0); + /* 2^102 - 2^2 */ square(t0,t1); + /* 2^200 - 2^100 */ for (i = 2;i < 100;i += 2) { square(t1,t0); square(t0,t1); } + /* 2^200 - 2^0 */ mult(t1,t0,z2_100_0); + + /* 2^201 - 2^1 */ square(t0,t1); + /* 2^202 - 2^2 */ square(t1,t0); + /* 2^250 - 2^50 */ for (i = 2;i < 50;i += 2) { square(t0,t1); square(t1,t0); } + /* 2^250 - 2^0 */ mult(t0,t1,z2_50_0); + + /* 2^251 - 2^1 */ square(t1,t0); + /* 2^252 - 2^2 */ square(t0,t1); + /* 2^253 - 2^3 */ square(t1,t0); + /* 2^254 - 2^4 */ square(t0,t1); + /* 2^255 - 2^5 */ square(t1,t0); + /* 2^255 - 21 */ mult(out,t1,z11); +} + +int crypto_scalarmult_curve25519(unsigned char *q, + const unsigned char *n, + const unsigned char *p) +{ + unsigned int work[96]; + unsigned char e[32]; + unsigned int i; + for (i = 0;i < 32;++i) e[i] = n[i]; + e[0] &= 248; + e[31] &= 127; + e[31] |= 64; + for (i = 0;i < 32;++i) work[i] = p[i]; + mainloop(work,e); + recip(work + 32,work + 32); + mult(work + 64,work,work + 32); + freeze(work + 64); + for (i = 0;i < 32;++i) q[i] = work[64 + i]; + return 0; +} diff --git a/plugins/ssh-base/include/lws-plugin-ssh.h b/plugins/ssh-base/include/lws-plugin-ssh.h new file mode 100644 index 000000000..4ba116583 --- /dev/null +++ b/plugins/ssh-base/include/lws-plugin-ssh.h @@ -0,0 +1,364 @@ +/* + * libwebsockets - lws-plugin-ssh-base + * + * Copyright (C) 2017 Andy Green + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation: + * version 2.1 of the License. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, + * MA 02110-1301 USA + */ + +#if !defined(__LWS_PLUGIN_SSH_H__) +#define __LWS_PLUGIN_SSH_H__ + +#define LWS_CALLBACK_SSH_UART_SET_RXFLOW (LWS_CALLBACK_USER + 800) + +#define LWS_SSH_OPS_VERSION 1 + +struct lws_ssh_pty { + char term[16]; + char *modes; + uint32_t width_ch; + uint32_t height_ch; + uint32_t width_px; + uint32_t height_px; + uint32_t modes_len; +}; + +#define SSHMO_TTY_OP_END 0 /* Indicates end of options. */ +#define SSHMO_VINTR 1 /* Interrupt character; 255 if none. Similarly + * for the other characters. Not all of these + * characters are supported on all systems. */ +#define SSHMO_VQUIT 2 /* The quit character (sends SIGQUIT signal on + * POSIX systems). */ +#define SSHMO_VERASE 3 /* Erase the character to left of the cursor. */ +#define SSHMO_VKILL 4 /* Kill the current input line. */ +#define SSHMO_VEOF 5 /* End-of-file character (sends EOF from the + * terminal). */ +#define SSHMO_VEOL 6 /* End-of-line character in addition to + * carriage return and/or linefeed. */ +#define SSHMO_VEOL2 7 /* Additional end-of-line character. */ +#define SSHMO_VSTART 8 /* Continues paused output (normally + * control-Q). */ +#define SSHMO_VSTOP 9 /* Pauses output (normally control-S). */ +#define SSHMO_VSUSP 10 /* Suspends the current program. */ +#define SSHMO_VDSUSP 11 /* Another suspend character. */ +#define SSHMO_VREPRINT 12 /* Reprints the current input line. */ +#define SSHMO_VWERASE 13 /* Erases a word left of cursor. */ +#define SSHMO_VLNEXT 14 /* Enter the next character typed literally, + * even if it is a special character */ +#define SSHMO_VFLUSH 15 /* Character to flush output. */ +#define SSHMO_VSWTCH 16 /* Switch to a different shell layer. */ +#define SSHMO_VSTATUS 17 /* Prints system status line (load, command, + * pid, etc). */ +#define SSHMO_VDISCARD 18 /* Toggles the flushing of terminal output. */ +#define SSHMO_IGNPAR 30 /* The ignore parity flag. The parameter + * SHOULD be 0 if this flag is FALSE, + * and 1 if it is TRUE. */ +#define SSHMO_PARMRK 31 /* Mark parity and framing errors. */ +#define SSHMO_INPCK 32 /* Enable checking of parity errors. */ +#define SSHMO_ISTRIP 33 /* Strip 8th bit off characters. */ +#define SSHMO_INLCR 34 /* Map NL into CR on input. */ +#define SSHMO_IGNCR 35 /* Ignore CR on input. */ +#define SSHMO_ICRNL 36 /* Map CR to NL on input. */ +#define SSHMO_IUCLC 37 /* Translate uppercase characters to lowercase. */ +#define SSHMO_IXON 38 /* Enable output flow control. */ +#define SSHMO_IXANY 39 /* Any char will restart after stop. */ +#define SSHMO_IXOFF 40 /* Enable input flow control. */ +#define SSHMO_IMAXBEL 41 /* Ring bell on input queue full. */ +#define SSHMO_ISIG 50 /* Enable signals INTR, QUIT, [D]SUSP. */ +#define SSHMO_ICANON 51 /* Canonicalize input lines. */ +#define SSHMO_XCASE 52 /* Enable input and output of uppercase + * characters by preceding their lowercase + * equivalents with "\". */ +#define SSHMO_ECHO 53 /* Enable echoing. */ +#define SSHMO_ECHOE 54 /* Visually erase chars. */ +#define SSHMO_ECHOK 55 /* Kill character discards current line. */ +#define SSHMO_ECHONL 56 /* Echo NL even if ECHO is off. */ +#define SSHMO_NOFLSH 57 /* Don't flush after interrupt. */ +#define SSHMO_TOSTOP 58 /* Stop background jobs from output. */ +#define SSHMO_IEXTEN 59 /* Enable extensions. */ +#define SSHMO_ECHOCTL 60 /* Echo control characters as ^(Char). */ +#define SSHMO_ECHOKE 61 /* Visual erase for line kill. */ +#define SSHMO_PENDIN 62 /* Retype pending input. */ +#define SSHMO_OPOST 70 /* Enable output processing. */ +#define SSHMO_OLCUC 71 /* Convert lowercase to uppercase. */ +#define SSHMO_ONLCR 72 /* Map NL to CR-NL. */ +#define SSHMO_OCRNL 73 /* Translate carriage return to newline (out). */ +#define SSHMO_ONOCR 74 /* Translate newline to CR-newline (out). */ +#define SSHMO_ONLRET 75 /* Newline performs a carriage return (out). */ +#define SSHMO_CS7 90 /* 7 bit mode. */ +#define SSHMO_CS8 91 /* 8 bit mode. */ +#define SSHMO_PARENB 92 /* Parity enable. */ +#define SSHMO_PARODD 93 /* Odd parity, else even. */ +#define SSHMO_TTY_OP_ISPEED 128 /* Specifies the input baud rate in + * bits per second. */ +#define SSHMO_TTY_OP_OSPEED 129 /* Specifies the output baud rate in + * bits per second. */ + +/*! \defgroup ssh-base plugin: lws-ssh-base + * \ingroup Protocols-and-Plugins + * + * ##Plugin lws-ssh-base + * + * This is the interface to customize the ssh server per-vhost. A pointer + * to your struct lws_ssh_ops with the members initialized is passed in using + * pvo when you create the vhost. The pvo is attached to the protocol name + * + * - "lws-ssh-base" - the ssh serving part + * + * - "lws-telnetd-base" - the telnet serving part + * + * This way you can have different instances of ssh servers wired up to + * different IO and server keys per-vhost. + * + * See also ./READMEs/README-plugin-sshd-base.md + */ +///@{ + +struct lws_ssh_ops { + /** + * channel_create() - Channel created + * + * \param wsi: raw wsi representing this connection + * \param priv: pointer to void * you can allocate and attach to the + * channel + * + * Called when new channel created, *priv should be set to any + * allocation your implementation needs + * + * You probably want to save the wsi inside your priv struct. Calling + * lws_callback_on_writable() on this wsi causes your ssh server + * instance to call .tx_waiting() next time you can write something + * to the client. + */ + int (*channel_create)(struct lws *wsi, void **priv); + + /** + * channel_destroy() - Channel is being destroyed + * + * \param priv: void * you set when channel was created (or NULL) + * + * Called when channel destroyed, priv should be freed if you allocated + * into it. + */ + int (*channel_destroy)(void *priv); + + /** + * rx() - receive payload from peer + * + * \param priv: void * you set when this channel was created + * \param wsi: struct lws * for the ssh connection + * \param buf: pointer to start of received data + * \param len: bytes of received data available at buf + * + * len bytes of payload from the peer arrived and is available at buf + */ + int (*rx)(void *priv, struct lws *wsi, const uint8_t *buf, uint32_t len); + + /** + * tx_waiting() - report if data waiting to transmit on the channel + * + * \param priv: void * you set when this channel was created + * + * returns a bitmask of LWS_STDOUT and LWS_STDERR, with the bits set + * if they have tx waiting to send, else 0 if nothing to send + * + * You should use one of the lws_callback_on_writable() family to + * trigger the ssh protocol to ask if you have any tx waiting. + * + * Returning -1 from here will close the tcp connection to the client. + */ + int (*tx_waiting)(void *priv); + + /** + * tx() - provide data to send on the channel + * + * \param priv: void * you set when this channel was created + * \param stdch: LWS_STDOUT or LWS_STDERR + * \param buf: start of the buffer to copy the transmit data into + * \param len: max length of the buffer in bytes + * + * copy and consume up to len bytes into *buf, + * return the actual copied count. + * + * You should use one of the lws_callback_on_writable() family to + * trigger the ssh protocol to ask if you have any tx waiting. If you + * do you will get calls here to fetch it, for each of LWS_STDOUT or + * LWS_STDERR that were reported to be waiting by tx_waiting(). + */ + size_t (*tx)(void *priv, int stdch, uint8_t *buf, size_t len); + + /** + * get_server_key() - retreive the secret keypair for this server + * + * \param wsi: the wsi representing the connection to the client + * \param buf: start of the buffer to copy the keypair into + * \param len: length of the buffer in bytes + * + * load the server key into buf, max len len. Returns length of buf + * set to key, or 0 if no key or other error. If there is no key, + * the error isn't fatal... the plugin will generate a random key and + * store it using *get_server_key() for subsequent times. + */ + size_t (*get_server_key)(struct lws *wsi, uint8_t *buf, size_t len); + + /** + * set_server_key() - store the secret keypair of this server + * + * \param wsi: the wsi representing the connection to the client + * \param buf: start of the buffer containing the keypair + * \param len: length of the keypair in bytes + * + * store the server key in buf, length len, to nonvolatile stg. + * Return length stored, 0 for fail. + */ + size_t (*set_server_key)(struct lws *wsi, uint8_t *buf, size_t len); + + /** + * set_env() - Set environment variable + * + * \param priv: void * you set when this channel was created + * \param name: env var name + * \param value: value to set env var to + * + * Client requested to set environment var. Return nonzero to fail. + */ + int (*set_env)(void *priv, const char *name, const char *value); + + /** + * exec() - spawn command and wire up stdin/out/err to ssh channel + * + * \param priv: void * you set when this channel was created + * \param wsi: the struct lws the connection belongs to + * \param command: string containing path to app and arguments + * + * Client requested to exec something. Return nonzero to fail. + */ + int (*exec)(void *priv, struct lws *wsi, const char *command); + + /** + * shell() - Spawn shell that is appropriate for user + * + * \param priv: void * you set when this channel was created + * \param wsi: the struct lws the connection belongs to + * + * Spawn the appropriate shell for this user. Return 0 for OK + * or nonzero to fail. + */ + int (*shell)(void *priv, struct lws *wsi); + + /** + * pty_req() - Create a Pseudo-TTY as described in pty + * + * \param priv: void * you set when this channel was created + * \param pty: pointer to struct describing the desired pty + * + * Client requested a pty. Return nonzero to fail. + */ + int (*pty_req)(void *priv, struct lws_ssh_pty *pty); + + /** + * child_process_io() - Child process has IO + * + * \param priv: void * you set when this channel was created + * \param wsi: the struct lws the connection belongs to + * \param args: information related to the cgi IO events + * + * Child process has IO + */ + int (*child_process_io)(void *priv, struct lws *wsi, + struct lws_cgi_args *args); + + /** + * child_process_io() - Child process has terminated + * + * \param priv: void * you set when this channel was created + * \param wsi: the struct lws the connection belongs to + * + * Child process has terminated + */ + int (*child_process_terminated)(void *priv, struct lws *wsi); + + /** + * disconnect_reason() - Optional notification why connection is lost + * + * \param reason: one of the SSH_DISCONNECT_ constants + * \param desc: UTF-8 description of reason + * \param desc_lang: RFC3066 language for description + * + * The remote peer may tell us why it's going to disconnect. Handling + * this is optional. + */ + void (*disconnect_reason)(uint32_t reason, const char *desc, + const char *desc_lang); + + /** + * is_pubkey_authorized() - check if auth pubkey is valid for user + * + * \param username: username the key attempted to authenticate + * \param type: "ssh-rsa" + * \param peer: start of Public key peer used to authenticate + * \param peer_len: length of Public key at peer + * + * We confirmed the client has the private key for this public key... + * but is that keypair something authorized for this username on this + * server? 0 = OK, 1 = fail + * + * Normally this checks for a copy of the same public key stored + * somewhere out of band, it's the same procedure as openssh does + * when looking in ~/.ssh/authorized_keys + */ + int (*is_pubkey_authorized)(const char *username, + const char *type, const uint8_t *peer, int peer_len); + + /** + * banner() - copy the connection banner to buffer + * + * \param buf: start of the buffer to copy to + * \param max_len: maximum number of bytes the buffer can hold + * \param lang: start of the buffer to copy language descriptor to + * \param max_lang_len: maximum number of bytes lang can hold + * + * Copy the text banner to be returned to client on connect, + * before auth, into buf. The text should be in UTF-8. + * if none wanted then leave .banner as NULL. + * + * lang should have a RFC3066 language descriptor like "en/US" + * copied to it. + * + * Returns the number of bytes copies to buf. + */ + size_t (*banner)(char *buf, size_t max_len, char *lang, + size_t max_lang_len); + + /** + * SSH version string sent to client (required) + * By convention a string like "SSH-2.0-Libwebsockets" + */ + const char *server_string; + + /** + * set to the API version you support (current is in + * LWS_SSH_OPS_VERSION) You should set it to an integer like 1, + * that reflects the latest api at the time your code was written. If + * the ops api_version is not equal to the LWS_SSH_OPS_VERSION of the + * plugin, it will error out at runtime. + */ + char api_version; +}; +///@} + +#endif + diff --git a/plugins/ssh-base/include/lws-plugin-sshd-static-build-includes.h b/plugins/ssh-base/include/lws-plugin-sshd-static-build-includes.h new file mode 100644 index 000000000..e134b4f05 --- /dev/null +++ b/plugins/ssh-base/include/lws-plugin-sshd-static-build-includes.h @@ -0,0 +1,18 @@ +/* + * If you are including the plugin into your code using static build, you + * can simplify it by just including this file, which will include all the + * related code in one step without you having to get involved in the detail. + */ + +#define LWS_PLUGIN_STATIC + +#include "../crypto/chacha.c" +#include "../crypto/ed25519.c" +#include "../crypto/fe25519.c" +#include "../crypto/ge25519.c" +#include "../crypto/poly1305.c" +#include "../crypto/sc25519.c" +#include "../crypto/smult_curve25519_ref.c" +#include "../kex-25519.c" +#include "../sshd.c" +#include "../telnet.c" diff --git a/plugins/ssh-base/include/lws-ssh.h b/plugins/ssh-base/include/lws-ssh.h new file mode 100644 index 000000000..c74c517d7 --- /dev/null +++ b/plugins/ssh-base/include/lws-ssh.h @@ -0,0 +1,600 @@ +/* + * libwebsockets - lws-plugin-ssh-base + * + * Copyright (C) 2017 Andy Green + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation: + * version 2.1 of the License. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, + * MA 02110-1301 USA + */ + +#if !defined(__LWS_SSH_H__) +#define __LWS_SSH_H__ + +#if defined(LWS_WITH_MBEDTLS) +#include "mbedtls/sha1.h" +#include "mbedtls/sha256.h" +#include "mbedtls/sha512.h" +#include "mbedtls/rsa.h" +#endif + +#include "lws-plugin-ssh.h" + +#define LWS_SIZE_EC25519 32 +#define LWS_SIZE_EC25519_PUBKEY 32 +#define LWS_SIZE_EC25519_PRIKEY 64 + +#define LWS_SIZE_SHA256 32 +#define LWS_SIZE_SHA512 64 + +#define LWS_SIZE_AES256_KEY 32 +#define LWS_SIZE_AES256_IV 12 +#define LWS_SIZE_AES256_MAC 16 +#define LWS_SIZE_AES256_BLOCK 16 + +#define LWS_SIZE_CHACHA256_KEY (2 * 32) +#define POLY1305_TAGLEN 16 +#define POLY1305_KEYLEN 32 + +#define crypto_hash_sha512_BYTES 64U + +#define PEEK_U64(p) \ + (((uint64_t)(((const uint8_t *)(p))[0]) << 56) | \ + ((uint64_t)(((const uint8_t *)(p))[1]) << 48) | \ + ((uint64_t)(((const uint8_t *)(p))[2]) << 40) | \ + ((uint64_t)(((const uint8_t *)(p))[3]) << 32) | \ + ((uint64_t)(((const uint8_t *)(p))[4]) << 24) | \ + ((uint64_t)(((const uint8_t *)(p))[5]) << 16) | \ + ((uint64_t)(((const uint8_t *)(p))[6]) << 8) | \ + (uint64_t)(((const uint8_t *)(p))[7])) +#define PEEK_U32(p) \ + (((uint32_t)(((const uint8_t *)(p))[0]) << 24) | \ + ((uint32_t)(((const uint8_t *)(p))[1]) << 16) | \ + ((uint32_t)(((const uint8_t *)(p))[2]) << 8) | \ + (uint32_t)(((const uint8_t *)(p))[3])) +#define PEEK_U16(p) \ + (((uint16_t)(((const uint8_t *)(p))[0]) << 8) | \ + (uint16_t)(((const uint8_t *)(p))[1])) + +#define POKE_U64(p, v) \ + do { \ + const uint64_t __v = (v); \ + ((uint8_t *)(p))[0] = (__v >> 56) & 0xff; \ + ((uint8_t *)(p))[1] = (__v >> 48) & 0xff; \ + ((uint8_t *)(p))[2] = (__v >> 40) & 0xff; \ + ((uint8_t *)(p))[3] = (__v >> 32) & 0xff; \ + ((uint8_t *)(p))[4] = (__v >> 24) & 0xff; \ + ((uint8_t *)(p))[5] = (__v >> 16) & 0xff; \ + ((uint8_t *)(p))[6] = (__v >> 8) & 0xff; \ + ((uint8_t *)(p))[7] = __v & 0xff; \ + } while (0) +#define POKE_U32(p, v) \ + do { \ + const uint32_t __v = (v); \ + ((uint8_t *)(p))[0] = (__v >> 24) & 0xff; \ + ((uint8_t *)(p))[1] = (__v >> 16) & 0xff; \ + ((uint8_t *)(p))[2] = (__v >> 8) & 0xff; \ + ((uint8_t *)(p))[3] = __v & 0xff; \ + } while (0) +#define POKE_U16(p, v) \ + do { \ + const uint16_t __v = (v); \ + ((uint8_t *)(p))[0] = (__v >> 8) & 0xff; \ + ((uint8_t *)(p))[1] = __v & 0xff; \ + } while (0) + + +enum { + SSH_MSG_DISCONNECT = 1, + SSH_MSG_IGNORE = 2, + SSH_MSG_UNIMPLEMENTED = 3, + SSH_MSG_DEBUG = 4, + SSH_MSG_SERVICE_REQUEST = 5, + SSH_MSG_SERVICE_ACCEPT = 6, + SSH_MSG_KEXINIT = 20, + SSH_MSG_NEWKEYS = 21, + + /* 30 .. 49: KEX messages specific to KEX protocol */ + SSH_MSG_KEX_ECDH_INIT = 30, + SSH_MSG_KEX_ECDH_REPLY = 31, + + /* 50... userauth */ + + SSH_MSG_USERAUTH_REQUEST = 50, + SSH_MSG_USERAUTH_FAILURE = 51, + SSH_MSG_USERAUTH_SUCCESS = 52, + SSH_MSG_USERAUTH_BANNER = 53, + + /* 60... publickey */ + + SSH_MSG_USERAUTH_PK_OK = 60, + + /* 80... connection */ + + SSH_MSG_GLOBAL_REQUEST = 80, + SSH_MSG_REQUEST_SUCCESS = 81, + SSH_MSG_REQUEST_FAILURE = 82, + + SSH_MSG_CHANNEL_OPEN = 90, + SSH_MSG_CHANNEL_OPEN_CONFIRMATION = 91, + SSH_MSG_CHANNEL_OPEN_FAILURE = 92, + SSH_MSG_CHANNEL_WINDOW_ADJUST = 93, + SSH_MSG_CHANNEL_DATA = 94, + SSH_MSG_CHANNEL_EXTENDED_DATA = 95, + SSH_MSG_CHANNEL_EOF = 96, + SSH_MSG_CHANNEL_CLOSE = 97, + SSH_MSG_CHANNEL_REQUEST = 98, + SSH_MSG_CHANNEL_SUCCESS = 99, + SSH_MSG_CHANNEL_FAILURE = 100, + + SSH_EXTENDED_DATA_STDERR = 1, + + SSH_CH_TYPE_SESSION = 1, + SSH_CH_TYPE_SCP = 2, + SSH_CH_TYPE_SFTP = 3, + + SSH_DISCONNECT_HOST_NOT_ALLOWED_TO_CONNECT = 1, + SSH_DISCONNECT_PROTOCOL_ERROR = 2, + SSH_DISCONNECT_KEY_EXCHANGE_FAILED = 3, + SSH_DISCONNECT_RESERVED = 4, + SSH_DISCONNECT_MAC_ERROR = 5, + SSH_DISCONNECT_COMPRESSION_ERROR = 6, + SSH_DISCONNECT_SERVICE_NOT_AVAILABLE = 7, + SSH_DISCONNECT_PROTOCOL_VERSION_NOT_SUPPORTED = 8, + SSH_DISCONNECT_HOST_KEY_NOT_VERIFIABLE = 9, + SSH_DISCONNECT_CONNECTION_LOST = 10, + SSH_DISCONNECT_BY_APPLICATION = 11, + SSH_DISCONNECT_TOO_MANY_CONNECTIONS = 12, + SSH_DISCONNECT_AUTH_CANCELLED_BY_USER = 13, + SSH_DISCONNECT_NO_MORE_AUTH_METHODS_AVAILABLE = 14, + SSH_DISCONNECT_ILLEGAL_USER_NAME = 15, + + SSH_OPEN_ADMINISTRATIVELY_PROHIBITED = 1, + SSH_OPEN_CONNECT_FAILED = 2, + SSH_OPEN_UNKNOWN_CHANNEL_TYPE = 3, + SSH_OPEN_RESOURCE_SHORTAGE = 4, + + KEX_STATE_EXPECTING_CLIENT_OFFER = 0, + KEX_STATE_REPLIED_TO_OFFER, + KEX_STATE_CRYPTO_INITIALIZED, + + SSH_KEYIDX_IV = 0, + SSH_KEYIDX_ENC, + SSH_KEYIDX_INTEG, + + /* things we may write on the connection */ + + SSH_WT_NONE = 0, + SSH_WT_VERSION, + SSH_WT_OFFER, + SSH_WT_OFFER_REPLY, + SSH_WT_SEND_NEWKEYS, + SSH_WT_UA_ACCEPT, + SSH_WT_UA_FAILURE, + SSH_WT_UA_BANNER, + SSH_WT_UA_PK_OK, + SSH_WT_UA_SUCCESS, + SSH_WT_CH_OPEN_CONF, + SSH_WT_CH_FAILURE, + SSH_WT_CHRQ_SUCC, + SSH_WT_CHRQ_FAILURE, + SSH_WT_SCP_ACK_OKAY, + SSH_WT_SCP_ACK_ERROR, + SSH_WT_CH_CLOSE, + SSH_WT_CH_EOF, + SSH_WT_WINDOW_ADJUST, + + /* RX parser states */ + + SSH_INITIALIZE_TRANSIENT = 0, + SSHS_IDSTRING, + SSHS_IDSTRING_CR, + SSHS_MSG_LEN, + SSHS_MSG_PADDING, + SSHS_MSG_ID, + SSH_KEX_STATE_COOKIE, + SSH_KEX_NL_KEX_ALGS_LEN, + SSH_KEX_NL_KEX_ALGS, + SSH_KEX_NL_SHK_ALGS_LEN, + SSH_KEX_NL_SHK_ALGS, + SSH_KEX_NL_EACTS_ALGS_LEN, + SSH_KEX_NL_EACTS_ALGS, + SSH_KEX_NL_EASTC_ALGS_LEN, + SSH_KEX_NL_EASTC_ALGS, + SSH_KEX_NL_MACTS_ALGS_LEN, + SSH_KEX_NL_MACTS_ALGS, + SSH_KEX_NL_MASTC_ALGS_LEN, + SSH_KEX_NL_MASTC_ALGS, + SSH_KEX_NL_CACTS_ALGS_LEN, + SSH_KEX_NL_CACTS_ALGS, + SSH_KEX_NL_CASTC_ALGS_LEN, + SSH_KEX_NL_CASTC_ALGS, + SSH_KEX_NL_LCTS_ALGS_LEN, + SSH_KEX_NL_LCTS_ALGS, + SSH_KEX_NL_LSTC_ALGS_LEN, + SSH_KEX_NL_LSTC_ALGS, + SSH_KEX_FIRST_PKT, + SSH_KEX_RESERVED, + + SSH_KEX_STATE_ECDH_KEYLEN, + SSH_KEX_STATE_ECDH_Q_C, + + SSHS_MSG_EAT_PADDING, + SSH_KEX_STATE_SKIP, + + SSHS_GET_STRING_LEN, + SSHS_GET_STRING, + SSHS_GET_STRING_LEN_ALLOC, + SSHS_GET_STRING_ALLOC, + SSHS_DO_SERVICE_REQUEST, + + SSHS_DO_UAR_SVC, + SSHS_DO_UAR_PUBLICKEY, + SSHS_NVC_DO_UAR_CHECK_PUBLICKEY, + SSHS_DO_UAR_SIG_PRESENT, + SSHS_NVC_DO_UAR_ALG, + SSHS_NVC_DO_UAR_PUBKEY_BLOB, + SSHS_NVC_DO_UAR_SIG, + + SSHS_GET_U32, + + SSHS_NVC_CHOPEN_TYPE, + SSHS_NVC_CHOPEN_SENDER_CH, + SSHS_NVC_CHOPEN_WINSIZE, + SSHS_NVC_CHOPEN_PKTSIZE, + + SSHS_NVC_CHRQ_RECIP, + SSHS_NVC_CHRQ_TYPE, + SSHS_CHRQ_WANT_REPLY, + SSHS_NVC_CHRQ_TERM, + SSHS_NVC_CHRQ_TW, + SSHS_NVC_CHRQ_TH, + SSHS_NVC_CHRQ_TWP, + SSHS_NVC_CHRQ_THP, + SSHS_NVC_CHRQ_MODES, + + SSHS_NVC_CHRQ_ENV_NAME, + SSHS_NVC_CHRQ_ENV_VALUE, + + SSHS_NVC_CHRQ_EXEC_CMD, + + SSHS_NVC_CHRQ_SUBSYSTEM, + + SSHS_NVC_CH_EOF, + SSHS_NVC_CH_CLOSE, + + SSHS_NVC_CD_RECIP, + SSHS_NVC_CD_DATA, + SSHS_NVC_CD_DATA_ALLOC, + + SSHS_NVC_WA_RECIP, + SSHS_NVC_WA_ADD, + + SSHS_NVC_DISCONNECT_REASON, + SSHS_NVC_DISCONNECT_DESC, + SSHS_NVC_DISCONNECT_LANG, + + SSHS_SCP_COLLECTSTR = 0, + SSHS_SCP_PAYLOADIN = 1, + + + /* from https://tools.ietf.org/html/draft-ietf-secsh-filexfer-13 */ + + SECSH_FILEXFER_VERSION = 6, + + /* sftp packet types */ + + SSH_FXP_INIT = 1, + SSH_FXP_VERSION = 2, + SSH_FXP_OPEN = 3, + SSH_FXP_CLOSE = 4, + SSH_FXP_READ = 5, + SSH_FXP_WRITE = 6, + SSH_FXP_LSTAT = 7, + SSH_FXP_FSTAT = 8, + SSH_FXP_SETSTAT = 9, + SSH_FXP_FSETSTAT = 10, + SSH_FXP_OPENDIR = 11, + SSH_FXP_READDIR = 12, + SSH_FXP_REMOVE = 13, + SSH_FXP_MKDIR = 14, + SSH_FXP_RMDIR = 15, + SSH_FXP_REALPATH = 16, + SSH_FXP_STAT = 17, + SSH_FXP_RENAME = 18, + SSH_FXP_READLINK = 19, + SSH_FXP_LINK = 21, + SSH_FXP_BLOCK = 22, + SSH_FXP_UNBLOCK = 23, + SSH_FXP_STATUS = 101, + SSH_FXP_HANDLE = 102, + SSH_FXP_DATA = 103, + SSH_FXP_NAME = 104, + SSH_FXP_ATTRS = 105, + SSH_FXP_EXTENDED = 200, + SSH_FXP_EXTENDED_REPLY = 201, + + /* sftp return codes */ + + SSH_FX_OK = 0, + SSH_FX_EOF = 1, + SSH_FX_NO_SUCH_FILE = 2, + SSH_FX_PERMISSION_DENIED = 3, + SSH_FX_FAILURE = 4, + SSH_FX_BAD_MESSAGE = 5, + SSH_FX_NO_CONNECTION = 6, + SSH_FX_CONNECTION_LOST = 7, + SSH_FX_OP_UNSUPPORTED = 8, + SSH_FX_INVALID_HANDLE = 9, + SSH_FX_NO_SUCH_PATH = 10, + SSH_FX_FILE_ALREADY_EXISTS = 11, + SSH_FX_WRITE_PROTECT = 12, + SSH_FX_NO_MEDIA = 13, + SSH_FX_NO_SPACE_ON_FILESYSTEM = 14, + SSH_FX_QUOTA_EXCEEDED = 15, + SSH_FX_UNKNOWN_PRINCIPAL = 16, + SSH_FX_LOCK_CONFLICT = 17, + SSH_FX_DIR_NOT_EMPTY = 18, + SSH_FX_NOT_A_DIRECTORY = 19, + SSH_FX_INVALID_FILENAME = 20, + SSH_FX_LINK_LOOP = 21, + SSH_FX_CANNOT_DELETE = 22, + SSH_FX_INVALID_PARAMETER = 23, + SSH_FX_FILE_IS_A_DIRECTORY = 24, + SSH_FX_BYTE_RANGE_LOCK_CONFLICT = 25, + SSH_FX_BYTE_RANGE_LOCK_REFUSED = 26, + SSH_FX_DELETE_PENDING = 27, + SSH_FX_FILE_CORRUPT = 28, + SSH_FX_OWNER_INVALID = 29, + SSH_FX_GROUP_INVALID = 30, + SSH_FX_NO_MATCHING_BYTE_RANGE_LOCK = 31, + + + SSH_PENDING_TIMEOUT_CONNECT_TO_SUCCESSFUL_AUTH = + PENDING_TIMEOUT_USER_REASON_BASE + 0, + + SSH_AUTH_STATE_NO_AUTH = 0, + SSH_AUTH_STATE_GAVE_AUTH_IGNORE_REQS = 1, +}; + +#define LWS_SSH_INITIAL_WINDOW 16384 + +struct lws_ssh_userauth { + struct lws_genhash_ctx hash_ctx; + char *username; + char *service; + char *alg; + uint8_t *pubkey; + uint32_t pubkey_len; + uint8_t *sig; + uint32_t sig_len; + char sig_present; +}; + +struct lws_ssh_keys { + /* 3 == SSH_KEYIDX_IV (len=4), SSH_KEYIDX_ENC, SSH_KEYIDX_INTEG */ + uint8_t key[3][LWS_SIZE_CHACHA256_KEY]; + + /* opaque allocation made when cipher activated */ + void *cipher; + + uint8_t MAC_length; + uint8_t padding_alignment; /* block size */ + uint8_t valid:1; + uint8_t full_length:1; +}; + +struct lws_kex { + uint8_t kex_r[256]; + uint8_t Q_C[LWS_SIZE_EC25519]; /* client eph public key aka 'e' */ + uint8_t eph_pri_key[LWS_SIZE_EC25519]; /* server eph private key */ + uint8_t Q_S[LWS_SIZE_EC25519]; /* server ephemeral public key */ + uint8_t kex_cookie[16]; + uint8_t *I_C; /* malloc'd copy of client KEXINIT payload */ + uint8_t *I_S; /* malloc'd copy of server KEXINIT payload */ + uint32_t I_C_payload_len; + uint32_t I_C_alloc_len; + uint32_t I_S_payload_len; + uint32_t kex_r_len; + uint8_t match_bitfield; + uint8_t newkeys; /* which sides newkeys have been applied */ + + struct lws_ssh_keys keys_next_cts; + struct lws_ssh_keys keys_next_stc; +}; + +struct lws_subprotocol_scp { + char fp[128]; + uint64_t len; + uint32_t attr; + char cmd; + char ips; +}; + +typedef union { + struct lws_subprotocol_scp scp; +} lws_subprotocol; + +struct lws_ssh_channel { + struct lws_ssh_channel *next; + lws_subprotocol *sub; /* NULL, or allocated subprotocol state */ + void *priv; /* owned by user code */ + int type; + uint32_t server_ch; + uint32_t sender_ch; + int32_t window; + int32_t peer_window_est; + uint32_t max_pkt; + + uint32_t spawn_pid; + + uint8_t had_eof:1; + uint8_t sent_close:1; + uint8_t received_close:1; +}; + +struct per_vhost_data__sshd; + +struct per_session_data__sshd { + struct per_session_data__sshd *next; + struct per_vhost_data__sshd *vhd; + struct lws *wsi; + + struct lws_kex *kex; + char *disconnect_desc; + + uint8_t K[LWS_SIZE_EC25519]; /* shared secret */ + uint8_t session_id[LWS_SIZE_SHA256]; /* H from first working KEX */ + char name[64]; + char last_auth_req_username[32]; + char last_auth_req_service[32]; + + struct lws_ssh_keys active_keys_cts; + struct lws_ssh_keys active_keys_stc; + struct lws_ssh_userauth *ua; + struct lws_ssh_channel *ch_list; + struct lws_ssh_channel *ch_temp; + + uint8_t *last_alloc; + + union { + struct lws_ssh_pty pty; + char aux[64]; + } args; + + uint32_t ssh_sequence_ctr_cts; + uint32_t ssh_sequence_ctr_stc; + + uint64_t payload_bytes_cts; + uint64_t payload_bytes_stc; + + uint32_t disconnect_reason; + + char V_C[64]; /* Client version String */ + uint8_t packet_assembly[2048]; + uint32_t pa_pos; + + uint32_t msg_len; + uint32_t pos; + uint32_t len; + uint32_t ctr; + uint32_t npos; + uint32_t reason; + uint32_t channel_doing_spawn; + int next_ch_num; + + uint8_t K_S[LWS_SIZE_EC25519]; /* server public key */ + + uint32_t copy_to_I_C:1; + uint32_t okayed_userauth:1; + uint32_t sent_banner:1; + uint32_t seen_auth_req_before:1; + uint32_t serviced_stderr_last:1; + uint32_t kex_state; + uint32_t chrq_server_port; + uint32_t ch_recip; + uint32_t count_auth_attempts; + + char parser_state; + char state_after_string; + char first_coming; + uint8_t rq_want_reply; + uint8_t ssh_auth_state; + + uint8_t msg_id; + uint8_t msg_padding; + uint8_t write_task[4]; + struct lws_ssh_channel *write_channel[4]; + uint8_t wt_head, wt_tail; +}; + +struct per_vhost_data__sshd { + struct lws_context *context; + struct lws_vhost *vhost; + const struct lws_protocols *protocol; + struct per_session_data__sshd *live_pss_list; + const struct lws_ssh_ops *ops; +}; + + +struct host_keys { + uint8_t *data; + uint32_t len; +}; + +extern struct host_keys host_keys[]; + +extern int +crypto_scalarmult_curve25519(unsigned char *q, const unsigned char *n, + const unsigned char *p); + +extern int +ed25519_key_parse(uint8_t *p, size_t len, char *type, size_t type_len, + uint8_t *pub, uint8_t *pri); + +extern int +kex_ecdh(struct per_session_data__sshd *pss, uint8_t *result, uint32_t *plen); + +extern uint32_t +lws_g32(uint8_t **p); + +extern uint32_t +lws_p32(uint8_t *p, uint32_t v); + +extern void +explicit_bzero(void *p, size_t len); + +extern int +timingsafe_bcmp(const void *a, const void *b, uint32_t len); + +extern const char *lws_V_S; + +extern int +lws_chacha_activate(struct lws_ssh_keys *keys); + +extern void +lws_chacha_destroy(struct lws_ssh_keys *keys); + +extern uint32_t +lws_chachapoly_get_length(struct lws_ssh_keys *keys, uint32_t seq, + const uint8_t *in4); + +extern void +poly1305_auth(u_char out[POLY1305_TAGLEN], const u_char *m, size_t inlen, + const u_char key[POLY1305_KEYLEN]); + +extern int +lws_chacha_decrypt(struct lws_ssh_keys *keys, uint32_t seq, + const uint8_t *ct, uint32_t len, uint8_t *pt); +extern int +lws_chacha_encrypt(struct lws_ssh_keys *keys, uint32_t seq, + const uint8_t *ct, uint32_t len, uint8_t *pt); + +extern void +lws_pad_set_length(struct per_session_data__sshd *pss, void *start, uint8_t **p, + struct lws_ssh_keys *keys); + +extern size_t +get_gen_server_key_25519(struct per_session_data__sshd *pss, uint8_t *b, size_t len); + +extern int +crypto_sign_ed25519(unsigned char *sm, unsigned long long *smlen, + const unsigned char *m, size_t mlen, + const unsigned char *sk); + +extern int +crypto_sign_ed25519_keypair(struct lws_context *context, uint8_t *pk, + uint8_t *sk); + +#endif diff --git a/plugins/ssh-base/kex-25519.c b/plugins/ssh-base/kex-25519.c new file mode 100644 index 000000000..7223ac194 --- /dev/null +++ b/plugins/ssh-base/kex-25519.c @@ -0,0 +1,546 @@ +/* + * libwebsockets - lws-plugin-ssh-base - kex-25519.c + * + * Copyright (C) 2017 Andy Green + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation: + * version 2.1 of the License. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, + * MA 02110-1301 USA + */ +#include "libwebsockets.h" +#include "lws-ssh.h" + +#include + +/* + * ssh-keygen -t ed25519 + * head -n-1 srv-key-25519 | tail -n +2 | base64 -d | hexdump -C + */ + +static void +lws_sized_blob(uint8_t **p, void *blob, uint32_t len) +{ + lws_p32((*p), len); + *p += 4; + memcpy(*p, blob, len); + *p += len; +} + +static const char key_leadin[] = "openssh-key-v1\x00\x00\x00\x00\x04none" + "\x00\x00\x00\x04none\x00" + "\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x33" + "\x00\x00\x00\x0bssh-ed25519\x00\x00\x00\x20", + key_sep[] = "\x00\x00\x00\x90\xb1\x4f\xa7\x28" + "\xb1\x4f\xa7\x28\x00\x00\x00\x0bssh-ed25519" + "\x00\x00\x00\x20", + key_privl[] = "\x00\x00\x00\x40", + key_trail[] = "\x00\x00\x00\x0cself-gen@cbl\x01"; + +static size_t +lws_gen_server_key_ed25519(struct lws_context *context, uint8_t *buf256, + size_t max_len) +{ + uint8_t *p = buf256 + sizeof(key_leadin) - 1; + + if (max_len < sizeof(key_leadin) - 1 + 32 + sizeof(key_sep) - 1 + 32 + + sizeof(key_privl) - 1 + 64 + sizeof(key_trail) - 1) + return 0; + + memcpy(buf256, key_leadin, sizeof(key_leadin) - 1); + crypto_sign_ed25519_keypair(context, p, p + 32 + sizeof(key_sep) - 1 + + 32 + sizeof(key_privl) - 1); + memcpy(p + 32 + sizeof(key_sep) - 1, p, 32); + p += 32; + memcpy(p, key_sep, sizeof(key_sep) - 1); + p += sizeof(key_sep) - 1 + 32; + memcpy(p, key_privl, sizeof(key_privl) - 1); + p += sizeof(key_privl) - 1 + 64; + memcpy(p, key_trail, sizeof(key_trail) - 1); + p += sizeof(key_trail) - 1; + + lwsl_notice("%s: Generated key len %ld\n", __func__, (long)(p - buf256)); + + return p - buf256; +} + +static int +lws_mpint_rfc4251(uint8_t *dest, const uint8_t *src, int bytes, int uns) +{ + uint8_t *odest = dest; + + while (!*src && bytes > 1) { + src++; + bytes--; + } + + if (!*src) { + *dest++ = 0; + *dest++ = 0; + *dest++ = 0; + *dest++ = 0; + + return 4; + } + + if (uns && (*src) & 0x80) + bytes++; + + *dest++ = bytes >> 24; + *dest++ = bytes >> 16; + *dest++ = bytes >> 8; + *dest++ = bytes; + + if (uns && (*src) & 0x80) { + *dest++ = 0; + bytes--; + } + + while (bytes--) + *dest++ = *src++; + + return dest - odest; +} + +int +ed25519_key_parse(uint8_t *p, size_t len, char *type, size_t type_len, + uint8_t *pub, uint8_t *pri) +{ + uint32_t l, publ, m; + uint8_t *op = p; + + if (len < 180) + return 1; + + if (memcmp(p, "openssh-key-v1", 14)) + return 2; + + p += 15; + + l = lws_g32(&p); /* ciphername */ + if (l != 4 || memcmp(p, "none", 4)) + return 3; + p += l; + + l = lws_g32(&p); /* kdfname */ + if (l != 4 || memcmp(p, "none", 4)) + return 4; + p += l; + + l = lws_g32(&p); /* kdfoptions */ + if (l) + return 5; + + l = lws_g32(&p); /* number of keys */ + if (l != 1) + return 6; + + publ = lws_g32(&p); /* length of pubkey block */ + if ((p - op) + publ >= len) + return 7; + + l = lws_g32(&p); /* key type length */ + if (l > 31) + return 8; + m = l; + if (m > type_len) + m = type_len -1 ; + strncpy(type, (const char *)p, m); + type[m] = '\0'; + + p += l; + l = lws_g32(&p); /* pub key length */ + if (l != 32) + return 10; + + p += l; + + publ = lws_g32(&p); /* length of private key block */ + if ((p - op) + publ != len) + return 11; + + l = lws_g32(&p); /* checkint 1 */ + if (lws_g32(&p) != l) /* must match checkint 2 */ + return 12; + + l = lws_g32(&p); /* key type length */ + + p += l; + l = lws_g32(&p); /* public key part length */ + if (l != LWS_SIZE_EC25519_PUBKEY) + return 15; + + if (pub) + memcpy(pub, p, LWS_SIZE_EC25519_PUBKEY); + p += l; + l = lws_g32(&p); /* private key part length */ + if (l != LWS_SIZE_EC25519_PRIKEY) + return 16; + + if (pri) + memcpy(pri, p, LWS_SIZE_EC25519_PRIKEY); + + return 0; +} + +static int +_genhash_update_len(struct lws_genhash_ctx *ctx, const void *input, size_t ilen) +{ + uint32_t be; + + lws_p32((uint8_t *)&be, ilen); + + if (lws_genhash_update(ctx, (uint8_t *)&be, 4)) + return 1; + if (lws_genhash_update(ctx, input, ilen)) + return 1; + + return 0; +} + +static int +kex_ecdh_dv(uint8_t *dest, int dest_len, const uint8_t *kbi, int kbi_len, + const uint8_t *H, char c, const uint8_t *session_id) +{ + uint8_t pool[LWS_SIZE_SHA256]; + struct lws_genhash_ctx ctx; + int n = 0, m; + + /* + * Key data MUST be taken from the beginning of the hash output. + * As many bytes as needed are taken from the beginning of the hash + * value. + * + * If the key length needed is longer than the output of the HASH, + * the key is extended by computing HASH of the concatenation of K + * and H and the entire key so far, and appending the resulting + * bytes (as many as HASH generates) to the key. This process is + * repeated until enough key material is available; the key is taken + * from the beginning of this value. In other words: + * + * K1 = HASH(K || H || X || session_id) (X is e.g., "A") + * K2 = HASH(K || H || K1) + * K3 = HASH(K || H || K1 || K2) + * ... + * key = K1 || K2 || K3 || ... + */ + + while (n < dest_len) { + + if (lws_genhash_init(&ctx, LWS_GENHASH_TYPE_SHA256)) + return 1; + + if (lws_genhash_update(&ctx, kbi, kbi_len)) + goto hash_failed; + if (lws_genhash_update(&ctx, H, LWS_SIZE_SHA256)) + goto hash_failed; + + if (!n) { + if (lws_genhash_update(&ctx, (void *)&c, 1)) + goto hash_failed; + if (lws_genhash_update(&ctx, session_id, + LWS_SIZE_EC25519)) + goto hash_failed; + } else + if (lws_genhash_update(&ctx, pool, LWS_SIZE_EC25519)) + goto hash_failed; + + lws_genhash_destroy(&ctx, pool); + + m = LWS_SIZE_EC25519; + if (m > (dest_len - n)) + m = dest_len - n; + + memcpy(dest, pool, m); + n += m; + dest += m; + } + + return 0; + +hash_failed: + lws_genhash_destroy(&ctx, NULL); + + return 1; +} + + +static const unsigned char basepoint[32] = { 9 }; + +size_t +get_gen_server_key_25519(struct per_session_data__sshd *pss, uint8_t *b, + size_t len) +{ + size_t s, mylen; + + mylen = pss->vhd->ops->get_server_key(pss->wsi, b, len); + if (mylen) + return mylen; + + /* create one then */ + lwsl_notice("Generating server hostkey\n"); + s = lws_gen_server_key_ed25519(pss->vhd->context, b, len); + lwsl_notice(" gen key len %ld\n", (long)s); + if (!s) + return 0; + /* set the key */ + if (!pss->vhd->ops->set_server_key(pss->wsi, b, s)) + return 0; + + /* new key stored OK */ + + return s; +} + +int +kex_ecdh(struct per_session_data__sshd *pss, uint8_t *reply, uint32_t *plen) +{ + uint8_t pri_key[64], temp[64], payload_sig[64 + 32], a, *lp, kbi[64]; + struct lws_kex *kex = pss->kex; + struct lws_genhash_ctx ctx; + unsigned long long smlen; + uint8_t *p = reply + 5; + uint32_t be, kbi_len; + uint8_t servkey[256]; + char keyt[33]; + int r, c; + + r = get_gen_server_key_25519(pss, servkey, sizeof(servkey)); + if (!r) { + lwsl_err("%s: Failed to get or gen server key\n", __func__); + + return 1; + } + + r = ed25519_key_parse(servkey, r, keyt, sizeof(keyt), + pss->K_S /* public key */, pri_key); + if (r) { + lwsl_notice("%s: server key parse failed: %d\n", __func__, r); + + return 1; + } + keyt[32] = '\0'; + + lwsl_info("Server key type: %s\n", keyt); + + /* + * 1) Generate ephemeral key pair [ eph_pri_key | kex->Q_S ] + * 2) Compute shared secret. + * 3) Generate and sign exchange hash. + * + * 1) A 32 bytes private key should be generated for each new + * connection, using a secure PRNG. The following actions + * must be done on the private key: + * + * mysecret[0] &= 248; + * mysecret[31] &= 127; + * mysecret[31] |= 64; + */ + lws_get_random(pss->vhd->context, kex->eph_pri_key, LWS_SIZE_EC25519); + kex->eph_pri_key[0] &= 248; + kex->eph_pri_key[31] &= 127; + kex->eph_pri_key[31] |= 64; + + /* + * 2) The public key is calculated using the cryptographic scalar + * multiplication: + * + * const unsigned char privkey[32]; + * unsigned char pubkey[32]; + * + * crypto_scalarmult (pubkey, privkey, basepoint); + */ + crypto_scalarmult_curve25519(kex->Q_S, kex->eph_pri_key, basepoint); + + a = 0; + for (r = 0; r < sizeof(kex->Q_S); r++) + a |= kex->Q_S[r]; + if (!a) { + lwsl_notice("all zero pubkey\n"); + return SSH_DISCONNECT_KEY_EXCHANGE_FAILED; + } + + /* + * The shared secret, k, is defined in SSH specifications to be a big + * integer. This number is calculated using the following procedure: + * + * X is the 32 bytes point obtained by the scalar multiplication of + * the other side's public key and the local private key scalar. + */ + crypto_scalarmult_curve25519(pss->K, kex->eph_pri_key, kex->Q_C); + + /* + * The whole 32 bytes of the number X are then converted into a big + * integer k. This conversion follows the network byte order. This + * step differs from RFC5656. + */ + kbi_len = lws_mpint_rfc4251(kbi, pss->K, LWS_SIZE_EC25519, 1); + + /* + * The exchange hash H is computed as the hash of the concatenation of + * the following: + * + * string V_C, the client's identification string (CR and LF + * excluded) + * string V_S, the server's identification string (CR and LF + * excluded) + * string I_C, the payload of the client's SSH_MSG_KEXINIT + * string I_S, the payload of the server's SSH_MSG_KEXINIT + * string K_S, the host key + * mpint Q_C, exchange value sent by the client + * mpint Q_S, exchange value sent by the server + * mpint K, the shared secret + * + * However there are a lot of unwritten details in the hash + * definition... + */ + + if (lws_genhash_init(&ctx, LWS_GENHASH_TYPE_SHA256)) { + lwsl_notice("genhash init failed\n"); + return 1; + } + + if (_genhash_update_len(&ctx, pss->V_C, strlen(pss->V_C))) + goto hash_probs; + if (_genhash_update_len(&ctx, pss->vhd->ops->server_string, /* aka V_S */ + strlen(pss->vhd->ops->server_string))) + goto hash_probs; + if (_genhash_update_len(&ctx, kex->I_C, kex->I_C_payload_len)) + goto hash_probs; + if (_genhash_update_len(&ctx, kex->I_S, kex->I_S_payload_len)) + goto hash_probs; + /* + * K_S (host public key) + * + * sum of name + key lengths and headers + * name length: name + * key length: key + * ---> */ + lws_p32((uint8_t *)&be, 8 + strlen(keyt) + LWS_SIZE_EC25519); + if (lws_genhash_update(&ctx, (void *)&be, 4)) + goto hash_probs; + + if (_genhash_update_len(&ctx, keyt, strlen(keyt))) + goto hash_probs; + if (_genhash_update_len(&ctx, pss->K_S, LWS_SIZE_EC25519)) + goto hash_probs; + /* <---- */ + + if (_genhash_update_len(&ctx, kex->Q_C, LWS_SIZE_EC25519)) + goto hash_probs; + if (_genhash_update_len(&ctx, kex->Q_S, LWS_SIZE_EC25519)) + goto hash_probs; + + if (lws_genhash_update(&ctx, kbi, kbi_len)) + goto hash_probs; + + if (lws_genhash_destroy(&ctx, temp)) + goto hash_probs; + + /* + * Sign the 32-byte SHA256 "exchange hash" in temp + * The signature is itself 64 bytes + */ + smlen = LWS_SIZE_EC25519 + 64; + if (crypto_sign_ed25519(payload_sig, &smlen, temp, LWS_SIZE_EC25519, + pri_key)) + return 1; + +#if 0 + l = LWS_SIZE_EC25519; + n = crypto_sign_ed25519_open(temp, &l, payload_sig, smlen, pss->K_S); + + lwsl_notice("own sig sanity check says %d\n", n); +#endif + + /* sig [64] and payload [32] concatenated in payload_sig + * + * The server then responds with the following + * + * uint32 packet length (exl self + mac) + * byte padding len + * byte SSH_MSG_KEX_ECDH_REPLY + * string server public host key and certificates (K_S) + * string Q_S (exchange value sent by the server) + * string signature of H + * padding + */ + *p++ = SSH_MSG_KEX_ECDH_REPLY; + + /* server public host key and certificates (K_S) */ + + lp = p; + p +=4; + lws_sized_blob(&p, keyt, strlen(keyt)); + lws_sized_blob(&p, pss->K_S, LWS_SIZE_EC25519); + lws_p32(lp, p - lp - 4); + + /* Q_S (exchange value sent by the server) */ + + lws_sized_blob(&p, kex->Q_S, LWS_SIZE_EC25519); + + /* signature of H */ + + lp = p; + p +=4; + lws_sized_blob(&p, keyt, strlen(keyt)); + lws_sized_blob(&p, payload_sig, 64); + lws_p32(lp, p - lp - 4); + + /* end of message */ + + lws_pad_set_length(pss, reply, &p, &pss->active_keys_stc); + *plen = p - reply; + + if (!pss->active_keys_stc.valid) + memcpy(pss->session_id, temp, LWS_SIZE_EC25519); + + /* RFC4253 7.2: + * + * The key exchange produces two values: a shared secret K, + * and an exchange hash H. Encryption and authentication + * keys are derived from these. The exchange hash H from the + * first key exchange is additionally used as the session + * identifier, which is a unique identifier for this connection. + * It is used by authentication methods as a part of the data + * that is signed as a proof of possession of a private key. + * Once computed, the session identifier is not changed, + * even if keys are later re-exchanged. + * + * The hash alg used in the KEX must be used for key derivation. + * + * 1) Initial IV client to server: + * + * HASH(K || H || "A" || session_id) + * + * (Here K is encoded as mpint and "A" as byte and session_id + * as raw data. "A" means the single character A, ASCII 65). + * + * + */ + for (c = 0; c < 3; c++) { + kex_ecdh_dv(kex->keys_next_cts.key[c], LWS_SIZE_CHACHA256_KEY, + kbi, kbi_len, temp, 'A' + (c * 2), pss->session_id); + kex_ecdh_dv(kex->keys_next_stc.key[c], LWS_SIZE_CHACHA256_KEY, + kbi, kbi_len, temp, 'B' + (c * 2), pss->session_id); + } + + explicit_bzero(temp, sizeof(temp)); + + return 0; + +hash_probs: + lws_genhash_destroy(&ctx, NULL); + + return 1; +} diff --git a/plugins/ssh-base/sshd.c b/plugins/ssh-base/sshd.c new file mode 100644 index 000000000..b3823db1d --- /dev/null +++ b/plugins/ssh-base/sshd.c @@ -0,0 +1,2619 @@ +/* + * libwebsockets - lws-plugin-ssh-base - sshd.c + * + * Copyright (C) 2017 Andy Green + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation: + * version 2.1 of the License. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, + * MA 02110-1301 USA + */ + +#include "libwebsockets.h" +#include "lws-ssh.h" + +#include + +void *sshd_zalloc(size_t s) +{ + void *p = malloc(s); + + if (p) + memset(p, 0, s); + + return p; +} + +uint32_t +lws_g32(uint8_t **p) +{ + uint32_t v = 0; + + v = (v << 8) | *((*p)++); + v = (v << 8) | *((*p)++); + v = (v << 8) | *((*p)++); + v = (v << 8) | *((*p)++); + + return v; +} + +uint32_t +lws_p32(uint8_t *p, uint32_t v) +{ + *p++ = v >> 24; + *p++ = v >> 16; + *p++ = v >> 8; + *p++ = v; + + return v; +} + +int +lws_cstr(uint8_t **p, const char *s, uint32_t max) +{ + uint32_t n = strlen(s); + + if (n > max) + return 1; + + lws_p32(*p, n); + *p += 4; + strcpy((char *)(*p), s); + *p += n; + + return 0; +} + +int +lws_buf(uint8_t **p, void *s, uint32_t len) +{ + lws_p32(*p, len); + *p += 4; + memcpy((char *)(*p), s, len); + *p += len; + + return 0; +} + + +void +explicit_bzero(void *p, size_t len) +{ + volatile uint8_t *vp = p; + + while (len--) + *vp++ = 0; +} + +int +timingsafe_bcmp(const void *a, const void *b, uint32_t len) +{ + const uint8_t *pa = a, *pb = b; + uint8_t sum = 0; + + while (len--) + sum |= (*pa ^ *pb); + + return sum; +} + +void +write_task(struct per_session_data__sshd *pss, struct lws_ssh_channel *ch, + int task) +{ + pss->write_task[pss->wt_head] = task; + pss->write_channel[pss->wt_head] = ch; + pss->wt_head = (pss->wt_head + 1) & 3; + lws_callback_on_writable(pss->wsi); +} + +void +lws_pad_set_length(struct per_session_data__sshd *pss, void *start, uint8_t **p, + struct lws_ssh_keys *keys) +{ + uint32_t len = *p - (uint8_t *)start; + uint8_t padc = 4, *bs = start; + + if (keys->full_length) + len -= 4; + + if ((len + padc) & (keys->padding_alignment - 1)) + padc += keys->padding_alignment - + ((len + padc) & (keys->padding_alignment - 1)); + + bs[4] = padc; + len += padc; + + if (!keys->valid) /* no crypto = pad with 00 */ + while (padc--) + *((*p)++) = 0; + else { /* crypto active = pad with random */ + lws_get_random(pss->vhd->context, *p, padc); + (*p) += padc; + } + if (keys->full_length) + len += 4; + + lws_p32(start, len - 4); +} + +static uint32_t +offer(struct per_session_data__sshd *pss, uint8_t *p, uint32_t len, int first, + int *payload_len) +{ + uint8_t *op = p, *lp, *end = p + len - 1; + int n, padc = 4, keylen; + char keyt[32]; + uint8_t keybuf[256]; + + keylen = get_gen_server_key_25519(pss, keybuf, sizeof(keybuf)); + if (!keylen) { + lwsl_notice("get_gen_server_key failed\n"); + return 1; + } + lwsl_info("keylen %d\n", keylen); + n = ed25519_key_parse(keybuf, keylen, + keyt, sizeof(keyt), NULL, NULL); + if (n) { + lwsl_notice("unable to parse server key: %d\n", n); + return 1; + } + + /* + * byte SSH_MSG_KEXINIT + * byte[16] cookie (random bytes) + * name-list kex_algorithms + * name-list server_host_key_algorithms + * name-list encryption_algorithms_client_to_server + * name-list encryption_algorithms_server_to_client + * name-list mac_algorithms_client_to_server + * name-list mac_algorithms_server_to_client + * name-list compression_algorithms_client_to_server + * name-list compression_algorithms_server_to_client + * name-list langua->es_client_to_server + * name-list langua->es_server_to_client + * boolean first_kex_packet_follows + * uint32 0 (reserved for future extension) + */ + + p += 5; /* msg len + padding */ + + *p++ = SSH_MSG_KEXINIT; + lws_get_random(pss->vhd->context, p, 16); + p += 16; + + /* KEX algorithms */ + + lp = p; + p += 4; + n = lws_snprintf((char *)p, end - p, "curve25519-sha256@libssh.org"); + p += lws_p32(lp, n); + + /* Server Host Key Algorithms */ + + lp = p; + p += 4; + n = lws_snprintf((char *)p, end - p, "%s", keyt); + p += lws_p32(lp, n); + + /* Encryption Algorithms: C -> S */ + + lp = p; + p += 4; +// n = lws_snprintf((char *)p, end - p, "aes256-gcm@openssh.com"); + n = lws_snprintf((char *)p, end - p, "chacha20-poly1305@openssh.com"); + p += lws_p32(lp, n); + + /* Encryption Algorithms: S -> C */ + + lp = p; + p += 4; +// n = lws_snprintf((char *)p, end - p, "aes256-gcm@openssh.com"); + n = lws_snprintf((char *)p, end - p, "chacha20-poly1305@openssh.com"); + p += lws_p32(lp, n); + + /* MAC Algorithms: C -> S */ + + lp = p; + p += 4; + /* bogus: chacha20 does not use MACs, but 'none' is not offered */ + n = lws_snprintf((char *)p, end - p, "hmac-sha2-256"); + p += lws_p32(lp, n); + + /* MAC Algorithms: S -> C */ + + lp = p; + p += 4; + /* bogus: chacha20 does not use MACs, but 'none' is not offered */ + n = lws_snprintf((char *)p, end - p, "hmac-sha2-256"); + p += lws_p32(lp, n); + + /* Compression Algorithms: C -> S */ + + lp = p; + p += 4; + n = lws_snprintf((char *)p, end - p, "none"); + p += lws_p32(lp, n); + + /* Compression Algorithms: S -> C */ + + lp = p; + p += 4; + n = lws_snprintf((char *)p, end - p, "none"); + p += lws_p32(lp, n); + + if (p - op < 13 + padc + 8) + return 0; + + /* Languages: C -> S */ + + *p++ = 0; + *p++ = 0; + *p++ = 0; + *p++ = 0; + + /* Languages: S -> C */ + + *p++ = 0; + *p++ = 0; + *p++ = 0; + *p++ = 0; + + /* First KEX packet coming */ + + *p++ = !!first; + + /* Reserved */ + + *p++ = 0; + *p++ = 0; + *p++ = 0; + *p++ = 0; + + len = p - op; + if (payload_len) + /* starts at buf + 5 and excludes padding */ + *payload_len = len - 5; + + /* we must give at least 4 bytes of 00 padding */ + + if ((len + padc) & 7) + padc += 8 - ((len + padc) & 7); + + op[4] = padc; + len += padc; + + while (padc--) + *p++ = 0; + + /* recorded length does not include the uint32_t len itself */ + lws_p32(op, len - 4); + + return len; +} + +static int +handle_name(struct per_session_data__sshd *pss) +{ + struct lws_kex *kex = pss->kex; + char keyt[32]; + uint8_t keybuf[256]; + int n = 0, len; + + switch (pss->parser_state) { + case SSH_KEX_NL_KEX_ALGS: + if (!strcmp(pss->name, "curve25519-sha256@libssh.org")) + kex->match_bitfield |= 1; + break; + case SSH_KEX_NL_SHK_ALGS: + len = get_gen_server_key_25519(pss, keybuf, sizeof(keybuf)); + if (!len) + break; + if (ed25519_key_parse(keybuf, len, + keyt, sizeof(keyt), + NULL, NULL)) { + lwsl_err("Unable to parse host key %d\n", n); + } else { + if (!strcmp(pss->name, keyt)) { + kex->match_bitfield |= 2; + break; + } + } + break; + case SSH_KEX_NL_EACTS_ALGS: + if (!strcmp(pss->name, "chacha20-poly1305@openssh.com")) + kex->match_bitfield |= 4; + break; + case SSH_KEX_NL_EASTC_ALGS: + if (!strcmp(pss->name, "chacha20-poly1305@openssh.com")) + kex->match_bitfield |= 8; + break; + case SSH_KEX_NL_MACTS_ALGS: + if (!strcmp(pss->name, "hmac-sha2-256")) + kex->match_bitfield |= 16; + break; + case SSH_KEX_NL_MASTC_ALGS: + if (!strcmp(pss->name, "hmac-sha2-256")) + kex->match_bitfield |= 32; + break; + case SSH_KEX_NL_CACTS_ALGS: + if (!strcmp(pss->name, "none")) + kex->match_bitfield |= 64; + break; + case SSH_KEX_NL_CASTC_ALGS: + if (!strcmp(pss->name, "none")) + kex->match_bitfield |= 128; + break; + case SSH_KEX_NL_LCTS_ALGS: + case SSH_KEX_NL_LSTC_ALGS: + break; + default: + break; + } + + return 0; +} + + +static int +lws_kex_create(struct per_session_data__sshd *pss) +{ + pss->kex = sshd_zalloc(sizeof(struct lws_kex)); + lwsl_info("%s\n", __func__); + return !pss->kex; +} + +static void +lws_kex_destroy(struct per_session_data__sshd *pss) +{ + if (!pss->kex) + return; + + lwsl_info("Destroying KEX\n"); + + if (pss->kex->I_C) { + free(pss->kex->I_C); + pss->kex->I_C = NULL; + } + if (pss->kex->I_S) { + free(pss->kex->I_S); + pss->kex->I_S = NULL; + } + + explicit_bzero(pss->kex, sizeof(*pss->kex)); + free(pss->kex); + pss->kex = NULL; +} + +static void +ssh_free(void *p) +{ + if (!p) + return; + + lwsl_debug("%s: FREE %p\n", __func__, p); + free(p); +} + +static void +lws_ua_destroy(struct per_session_data__sshd *pss) +{ + if (!pss->ua) + return; + + lwsl_info("%s\n", __func__); + + if (pss->ua->username) + ssh_free(pss->ua->username); + if (pss->ua->service) + ssh_free(pss->ua->service); + if (pss->ua->alg) + ssh_free(pss->ua->alg); + if (pss->ua->pubkey) + ssh_free(pss->ua->pubkey); + if (pss->ua->sig) { + explicit_bzero(pss->ua->sig, pss->ua->sig_len); + ssh_free(pss->ua->sig); + } + + explicit_bzero(pss->ua, sizeof(*pss->ua)); + free(pss->ua); + pss->ua = NULL; +} + + +static int +rsa_hash_alg_from_ident(const char *ident) +{ + if (strcmp(ident, "ssh-rsa") == 0 || + strcmp(ident, "ssh-rsa-cert-v01@openssh.com") == 0) + return LWS_GENHASH_TYPE_SHA1; + if (strcmp(ident, "rsa-sha2-256") == 0) + return LWS_GENHASH_TYPE_SHA256; + if (strcmp(ident, "rsa-sha2-512") == 0) + return LWS_GENHASH_TYPE_SHA512; + + return -1; +} + +static void +state_get_string_alloc(struct per_session_data__sshd *pss, int next) +{ + pss->parser_state = SSHS_GET_STRING_LEN_ALLOC; + pss->state_after_string = next; +} + +static void +state_get_string(struct per_session_data__sshd *pss, int next) +{ + pss->parser_state = SSHS_GET_STRING_LEN; + pss->state_after_string = next; +} + +static void +state_get_u32(struct per_session_data__sshd *pss, int next) +{ + pss->parser_state = SSHS_GET_U32; + pss->state_after_string = next; +} + +static struct lws_ssh_channel * +ssh_get_server_ch(struct per_session_data__sshd *pss, uint32_t chi) +{ + struct lws_ssh_channel *ch = pss->ch_list; + + while (ch) { + if (ch->server_ch == chi) + return ch; + ch = ch->next; + } + + return NULL; +} + +#if 0 +static struct lws_ssh_channel * +ssh_get_peer_ch(struct per_session_data__sshd *pss, uint32_t chi) +{ + struct lws_ssh_channel *ch = pss->ch_list; + + while (ch) { + if (ch->sender_ch == chi) + return ch; + ch = ch->next; + } + + return NULL; +} +#endif + +static void +ssh_destroy_channel(struct per_session_data__sshd *pss, + struct lws_ssh_channel *ch) +{ + lws_start_foreach_llp(struct lws_ssh_channel **, ppch, pss->ch_list) { + if (*ppch == ch) { + lwsl_info("Deleting ch %p\n", ch); + if (pss->vhd && pss->vhd->ops && + pss->vhd->ops->channel_destroy) + pss->vhd->ops->channel_destroy(ch->priv); + *ppch = ch->next; + if (ch->sub) + free(ch->sub); + free(ch); + + return; + } + } lws_end_foreach_llp(ppch, next); + + lwsl_notice("Failed to delete ch\n"); +} + + +static int +lws_ssh_parse_plaintext(struct per_session_data__sshd *pss, uint8_t *p, size_t len) +{ +#if defined(LWS_USE_MBEDTLS) + mbedtls_rsa_context *ctx; +#else + BIGNUM *bn_e = NULL, *bn_n = NULL; + RSA *rsa = NULL; +#endif + struct lws_ssh_channel *ch; + struct lws_subprotocol_scp *scp; + uint8_t *pp, *ps, hash[64], *otmp; + size_t olen; + uint32_t m; + int n; + + while (len --) { +again: + switch(pss->parser_state) { + case SSH_INITIALIZE_TRANSIENT: + pss->parser_state = SSHS_IDSTRING; + pss->ctr = 0; + pss->copy_to_I_C = 0; + + /* fallthru */ + case SSHS_IDSTRING: + if (*p == 0x0d) { + pss->V_C[pss->npos] = '\0'; + pss->npos = 0; + lwsl_info("peer id: %s\n", pss->V_C); + p++; + pss->parser_state = SSHS_IDSTRING_CR; + break; + } + if (pss->npos < sizeof(pss->V_C) - 1) + pss->V_C[pss->npos++] = *p; + p++; + break; + + case SSHS_IDSTRING_CR: + if (*p++ != 0x0a) { + lwsl_notice("mangled id string\n"); + return 1; + } + pss->ssh_sequence_ctr_cts = 0; + pss->parser_state = SSHS_MSG_LEN; + break; + + case SSHS_MSG_LEN: + pss->msg_len = (pss->msg_len << 8) | *p++; + if (++pss->ctr != 4) + break; + + if (pss->active_keys_cts.valid) { + uint8_t b[4]; + + POKE_U32(b, pss->msg_len); + pss->msg_len = lws_chachapoly_get_length( + &pss->active_keys_cts, + pss->ssh_sequence_ctr_cts, b); + } else + pss->ssh_sequence_ctr_cts++; + + lwsl_info("msg len %d\n", pss->msg_len); + + pss->parser_state = SSHS_MSG_PADDING; + pss->ctr = 0; + pss->pos = 4; + if (pss->msg_len < 2 + 4) { + lwsl_notice("illegal msg size\n"); + goto bail; + } + break; + + case SSHS_MSG_PADDING: + pss->msg_padding = *p++; + pss->parser_state = SSHS_MSG_ID; + break; + + case SSHS_MSG_ID: + pss->msg_id = *p++; + pss->ctr = 0; + switch (pss->msg_id) { + case SSH_MSG_DISCONNECT: + /* + * byte SSH_MSG_DISCONNECT + * uint32 reason code + * string description in ISO-10646 + * UTF-8 encoding [RFC3629] + * string language tag [RFC3066] + */ + lwsl_notice("SSH_MSG_DISCONNECT\n"); + state_get_u32(pss, SSHS_NVC_DISCONNECT_REASON); + break; + case SSH_MSG_IGNORE: + lwsl_notice("SSH_MSG_IGNORE\n"); + break; + case SSH_MSG_UNIMPLEMENTED: + lwsl_notice("SSH_MSG_UNIMPLEMENTED\n"); + break; + case SSH_MSG_DEBUG: + lwsl_notice("SSH_MSG_DEBUG\n"); + break; + case SSH_MSG_SERVICE_REQUEST: + lwsl_info("SSH_MSG_SERVICE_REQUEST\n"); + /* payload is a string */ + state_get_string(pss, SSHS_DO_SERVICE_REQUEST); + break; + case SSH_MSG_SERVICE_ACCEPT: + lwsl_notice("SSH_MSG_ACCEPT\n"); + break; + + case SSH_MSG_KEXINIT: + if (pss->kex_state != + KEX_STATE_EXPECTING_CLIENT_OFFER) { + pss->parser_state = SSH_KEX_STATE_SKIP; + break; + } + pss->parser_state = SSH_KEX_STATE_COOKIE; + pss->kex->I_C_payload_len = 0; + pss->kex->I_C_alloc_len = pss->msg_len; + pss->kex->I_C = sshd_zalloc(pss->kex->I_C_alloc_len); + if (!pss->kex->I_C) { + lwsl_notice("OOM 3\n"); + goto bail; + } + pss->kex->I_C[pss->kex->I_C_payload_len++] = + pss->msg_id; + pss->copy_to_I_C = 1; + break; + case SSH_MSG_KEX_ECDH_INIT: + pss->parser_state = SSH_KEX_STATE_ECDH_KEYLEN; + break; + + case SSH_MSG_NEWKEYS: + if (pss->kex_state != + KEX_STATE_REPLIED_TO_OFFER && + pss->kex_state != + KEX_STATE_CRYPTO_INITIALIZED) { + lwsl_notice("unexpected newkeys\n"); + + goto bail; + } + /* + * it means we should now use the keys we + * agreed on + */ + lwsl_info("Activating CTS keys\n"); + pss->active_keys_cts = pss->kex->keys_next_cts; + if (lws_chacha_activate(&pss->active_keys_cts)) + goto bail; + + pss->kex->newkeys |= 2; + if (pss->kex->newkeys == 3) + lws_kex_destroy(pss); + + if (pss->msg_padding) { + pss->copy_to_I_C = 0; + pss->parser_state = + SSHS_MSG_EAT_PADDING; + break; + } else { + pss->parser_state = SSHS_MSG_LEN; + } + break; + + case SSH_MSG_USERAUTH_REQUEST: + /* + * byte SSH_MSG_USERAUTH_REQUEST + * string user name in UTF-8 + * encoding [RFC3629] + * string service name in US-ASCII + * string "publickey" + * boolean FALSE + * string public key alg + * string public key blob + */ + lwsl_info("SSH_MSG_USERAUTH_REQUEST\n"); + if (pss->ua) { + lwsl_notice("pss->ua overwrite\n"); + + goto bail; + } + + pss->ua = sshd_zalloc(sizeof(*pss->ua)); + if (!pss->ua) + goto bail; + + state_get_string_alloc(pss, SSHS_DO_UAR_SVC); + /* username is destroyed with userauth struct */ + if (!pss->sent_banner) { + if (pss->vhd->ops->banner) + write_task(pss, NULL, + SSH_WT_UA_BANNER); + pss->sent_banner = 1; + } + break; + case SSH_MSG_USERAUTH_FAILURE: + goto bail; + case SSH_MSG_USERAUTH_SUCCESS: + goto bail; + case SSH_MSG_USERAUTH_BANNER: + goto bail; + + case SSH_MSG_CHANNEL_OPEN: + state_get_string(pss, SSHS_NVC_CHOPEN_TYPE); + break; + + case SSH_MSG_CHANNEL_REQUEST: + /* RFC4254 + * + * byte SSH_MSG_CHANNEL_REQUEST + * uint32 recipient channel + * string "pty-req" + * boolean want_reply + * string TERM environment variable value + * (e.g., vt100) + * uint32 terminal width, characters + * (e.g., 80) + * uint32 terminal height, rows (e.g., 24) + * uint32 terminal width, px (e.g., 640) + * uint32 terminal height, px (e.g., 480) + * string encoded terminal modes + */ + state_get_u32(pss, SSHS_NVC_CHRQ_RECIP); + break; + + case SSH_MSG_CHANNEL_EOF: + /* RFC4254 + * When a party will no longer send more data + * to a channel, it SHOULD send + * SSH_MSG_CHANNEL_EOF. + * + * byte SSH_MSG_CHANNEL_EOF + * uint32 recipient channel + */ + state_get_u32(pss, SSHS_NVC_CH_EOF); + break; + + case SSH_MSG_CHANNEL_CLOSE: + /* RFC4254 + * + * byte SSH_MSG_CHANNEL_CLOSE + * uint32 recipient channel + * + * This message does not consume window space + * and can be sent even if no window space is + * available. + * + * It is RECOMMENDED that all data sent before + * this message be delivered to the actual + * destination, if possible. + */ + state_get_u32(pss, SSHS_NVC_CH_CLOSE); + break; + + case SSH_MSG_CHANNEL_DATA: + /* RFC4254 + * + * byte SSH_MSG_CHANNEL_DATA + * uint32 recipient channel + * string data + */ + state_get_u32(pss, SSHS_NVC_CD_RECIP); + break; + + case SSH_MSG_CHANNEL_WINDOW_ADJUST: + /* RFC452 + * + * byte SSH_MSG_CHANNEL_WINDOW_ADJUST + * uint32 recipient channel + * uint32 bytes to add + */ + if (!pss->ch_list) + goto bail; + + state_get_u32(pss, SSHS_NVC_WA_RECIP); + break; + default: + lwsl_notice("unk msg_id %d\n", pss->msg_id); + + goto bail; + } + break; + + case SSH_KEX_STATE_COOKIE: + if (pss->msg_len < 16 + 1 + 1 + (10 * 4) + 5) { + lwsl_notice("sanity: kex length failed\n"); + goto bail; + } + pss->kex->kex_cookie[pss->ctr++] = *p++; + if (pss->ctr != sizeof(pss->kex->kex_cookie)) + break; + pss->parser_state = SSH_KEX_NL_KEX_ALGS_LEN; + pss->ctr = 0; + break; + case SSH_KEX_NL_KEX_ALGS_LEN: + case SSH_KEX_NL_SHK_ALGS_LEN: + case SSH_KEX_NL_EACTS_ALGS_LEN: + case SSH_KEX_NL_EASTC_ALGS_LEN: + case SSH_KEX_NL_MACTS_ALGS_LEN: + case SSH_KEX_NL_MASTC_ALGS_LEN: + case SSH_KEX_NL_CACTS_ALGS_LEN: + case SSH_KEX_NL_CASTC_ALGS_LEN: + case SSH_KEX_NL_LCTS_ALGS_LEN: + case SSH_KEX_NL_LSTC_ALGS_LEN: + case SSH_KEX_STATE_ECDH_KEYLEN: + + pss->len = (pss->len << 8) | *p++; + if (++pss->ctr != 4) + break; + + switch (pss->parser_state) { + case SSH_KEX_STATE_ECDH_KEYLEN: + pss->parser_state = SSH_KEX_STATE_ECDH_Q_C; + break; + default: + pss->parser_state++; + if (pss->len == 0) + pss->parser_state++; + break; + } + pss->ctr = 0; + pss->npos = 0; + if (pss->msg_len - pss->pos < pss->len) { + lwsl_notice("sanity: length %d - %d < %d\n", + pss->msg_len, pss->pos, pss->len); + goto bail; + } + break; + + case SSH_KEX_NL_KEX_ALGS: + case SSH_KEX_NL_SHK_ALGS: + case SSH_KEX_NL_EACTS_ALGS: + case SSH_KEX_NL_EASTC_ALGS: + case SSH_KEX_NL_MACTS_ALGS: + case SSH_KEX_NL_MASTC_ALGS: + case SSH_KEX_NL_CACTS_ALGS: + case SSH_KEX_NL_CASTC_ALGS: + case SSH_KEX_NL_LCTS_ALGS: + case SSH_KEX_NL_LSTC_ALGS: + if (*p != ',') { + if (pss->npos < sizeof(pss->name) - 1) + pss->name[pss->npos++] = *p; + } else { + pss->name[pss->npos] = '\0'; + pss->npos = 0; + handle_name(pss); + } + p++; + if (!--pss->len) { + pss->name[pss->npos] = '\0'; + if (pss->npos) + handle_name(pss); + pss->parser_state++; + break; + } + break; + + case SSH_KEX_FIRST_PKT: + pss->first_coming = !!*p++; + pss->parser_state = SSH_KEX_RESERVED; + break; + + case SSH_KEX_RESERVED: + pss->len = (pss->len << 8) | *p++; + if (++pss->ctr != 4) + break; + pss->ctr = 0; + if (pss->msg_padding) { + pss->copy_to_I_C = 0; + pss->parser_state = SSHS_MSG_EAT_PADDING; + break; + } + pss->parser_state = SSHS_MSG_LEN; + break; + + case SSH_KEX_STATE_ECDH_Q_C: + if (pss->len != 32) { + lwsl_notice("wrong key len\n"); + goto bail; + } + pss->kex->Q_C[pss->ctr++] = *p++; + if (pss->ctr != 32) + break; + lwsl_info("Q_C parsed\n"); + pss->parser_state = SSHS_MSG_EAT_PADDING; + break; + + case SSH_KEX_STATE_SKIP: + if (pss->pos - 4 < pss->msg_len) { + p++; + break; + } + lwsl_debug("skip done pos %d, msg_len %d len=%ld, \n", + pss->pos, pss->msg_len, (long)len); + pss->parser_state = SSHS_MSG_LEN; + pss->ctr = 0; + break; + + case SSHS_MSG_EAT_PADDING: + p++; + if (--pss->msg_padding) + break; + if (pss->msg_len + 4 != pss->pos) { + lwsl_notice("sanity: kex end mismatch %d %d\n", + pss->pos, pss->msg_len); + goto bail; + } + + switch (pss->msg_id) { + case SSH_MSG_KEX_ECDH_INIT: + if (pss->kex->match_bitfield != 0xff) { + lwsl_notice("unable to negotiate\n"); + goto bail; + } + if (kex_ecdh(pss, pss->kex->kex_r, + &pss->kex->kex_r_len)) { + lwsl_notice("hex_ecdh failed\n"); + goto bail; + } + write_task(pss, NULL, SSH_WT_OFFER_REPLY); + break; + } + + pss->parser_state = SSHS_MSG_LEN; + pss->ctr = 0; + break; + + case SSHS_GET_STRING_LEN: + pss->npos = 0; + pss->len = (pss->len << 8) | *p++; + if (++pss->ctr != 4) + break; + pss->ctr = 0; + pss->parser_state = SSHS_GET_STRING; + break; + + case SSHS_GET_STRING: + if (pss->npos >= sizeof(pss->name) - 1) { + lwsl_notice("non-alloc string too big\n"); + goto bail; + } + pss->name[pss->npos++] = *p++; + if (pss->npos != pss->len) + break; + + pss->name[pss->npos] = '\0'; + pss->parser_state = pss->state_after_string; + goto again; + + case SSHS_GET_STRING_LEN_ALLOC: + pss->npos = 0; + pss->len = (pss->len << 8) | *p++; + if (++pss->ctr != 4) + break; + pss->ctr = 0; + pss->last_alloc = sshd_zalloc(pss->len + 1); + lwsl_debug("SSHS_GET_STRING_LEN_ALLOC: %p, state %d\n", + pss->last_alloc, pss->state_after_string); + if (!pss->last_alloc) { + lwsl_notice("alloc string too big\n"); + goto bail; + } + pss->parser_state = SSHS_GET_STRING_ALLOC; + break; + + case SSHS_GET_STRING_ALLOC: + if (pss->npos >= pss->len) + goto bail; + pss->last_alloc[pss->npos++] = *p++; + if (pss->npos != pss->len) + break; + pss->last_alloc[pss->npos] = '\0'; + pss->parser_state = pss->state_after_string; + goto again; + + /* + * User Authentication + */ + + case SSHS_DO_SERVICE_REQUEST: + pss->okayed_userauth = 1; + pss->parser_state = SSHS_MSG_EAT_PADDING; + /* + * this only 'accepts' that we can negotiate auth for + * this service, not accepts the auth + */ + write_task(pss, NULL, SSH_WT_UA_ACCEPT); + break; + + case SSHS_DO_UAR_SVC: + pss->ua->username = (char *)pss->last_alloc; + state_get_string_alloc(pss, SSHS_DO_UAR_PUBLICKEY); + /* destroyed with UA struct */ + break; + + case SSHS_DO_UAR_PUBLICKEY: + pss->ua->service = (char *)pss->last_alloc; + + /* Sect 5, RFC4252 + * + * The 'user name' and 'service name' are repeated in + * every new authentication attempt, and MAY change. + * + * The server implementation MUST carefully check them + * in every message, and MUST flush any accumulated + * authentication states if they change. If it is + * unable to flush an authentication state, it MUST + * disconnect if the 'user name' or 'service name' + * changes. + */ + + if (pss->seen_auth_req_before && ( + strcmp(pss->ua->username, + pss->last_auth_req_username) || + strcmp(pss->ua->service, + pss->last_auth_req_service))) { + lwsl_notice("username / svc changed\n"); + + goto bail; + } + + pss->seen_auth_req_before = 1; + strncpy(pss->last_auth_req_username, pss->ua->username, + sizeof(pss->last_auth_req_username) - 1); + pss->last_auth_req_username[ + sizeof(pss->last_auth_req_username) - 1] = '\0'; + strncpy(pss->last_auth_req_service, pss->ua->service, + sizeof(pss->last_auth_req_service) - 1); + pss->last_auth_req_service[ + sizeof(pss->last_auth_req_service) - 1] = '\0'; + + if (strcmp(pss->ua->service, "ssh-connection")) + goto ua_fail; + state_get_string(pss, SSHS_NVC_DO_UAR_CHECK_PUBLICKEY); + break; + + case SSHS_NVC_DO_UAR_CHECK_PUBLICKEY: + if (!strcmp(pss->name, "none")) { + /* we must fail it */ + lwsl_info("got 'none' req, refusing\n"); + goto ua_fail; + } + + if (strcmp(pss->name, "publickey")) { + lwsl_notice("expected 'publickey' got '%s'\n", + pss->name); + goto ua_fail; + } + pss->parser_state = SSHS_DO_UAR_SIG_PRESENT; + break; + + case SSHS_DO_UAR_SIG_PRESENT: + lwsl_info("SSHS_DO_UAR_SIG_PRESENT\n"); + pss->ua->sig_present = *p++; + state_get_string_alloc(pss, SSHS_NVC_DO_UAR_ALG); + /* destroyed with UA struct */ + break; + + case SSHS_NVC_DO_UAR_ALG: + pss->ua->alg = (char *)pss->last_alloc; + if (rsa_hash_alg_from_ident(pss->ua->alg) < 0) { + lwsl_notice("unknown alg\n"); + goto ua_fail; + } + state_get_string_alloc(pss, SSHS_NVC_DO_UAR_PUBKEY_BLOB); + /* destroyed with UA struct */ + break; + + case SSHS_NVC_DO_UAR_PUBKEY_BLOB: + pss->ua->pubkey = pss->last_alloc; + pss->ua->pubkey_len = pss->npos; + /* + * RFC4253 + * + * ssh-rsa + * + * The structure inside the blob is + * + * mpint e + * mpint n + * + * Let's see if this key is authorized + */ + + n = 1; + if (pss->vhd->ops && pss->vhd->ops->is_pubkey_authorized) + n = pss->vhd->ops->is_pubkey_authorized( + pss->ua->username, pss->ua->alg, + pss->ua->pubkey, pss->ua->pubkey_len); + if (n) { + lwsl_info("rejecting peer pubkey\n"); + goto ua_fail; + } + + if (pss->ua->sig_present) { + state_get_string_alloc(pss, SSHS_NVC_DO_UAR_SIG); + /* destroyed with UA struct */ + break; + } + + /* + * This key is at least one we would be prepared + * to accept if he really has it... since no sig + * client should resend everything with a sig + * appended. OK it and delete this initial UA + */ + write_task(pss, NULL, SSH_WT_UA_PK_OK); + pss->parser_state = SSHS_MSG_EAT_PADDING; + break; + + case SSHS_NVC_DO_UAR_SIG: + /* + * Now the pubkey is coming with a sig + */ + /* Sect 5.1 RFC4252 + * + * SSH_MSG_USERAUTH_SUCCESS MUST be sent only once. + * When SSH_MSG_USERAUTH_SUCCESS has been sent, any + * further authentication requests received after that + * SHOULD be silently ignored. + */ + if (pss->ssh_auth_state == SSH_AUTH_STATE_GAVE_AUTH_IGNORE_REQS) { + lwsl_info("Silently ignoring auth req after accepted\n"); + goto ua_fail_silently; + } + lwsl_info("SSHS_DO_UAR_SIG\n"); + pss->ua->sig = pss->last_alloc; + pss->ua->sig_len = pss->npos; + pss->parser_state = SSHS_MSG_EAT_PADDING; + + /* + * RFC 4252 p9 + * + * The value of 'signature' is a signature with + * the private host key of the following data, in + * this order: + * + * string session identifier + * byte SSH_MSG_USERAUTH_REQUEST + * string user name + * string service name + * string "publickey" + * boolean TRUE + * string public key algorithm name + * string public key to be used for auth + * + * We reproduce the signature plaintext and the + * hash, and then decrypt the incoming signed block. + * What comes out is some ASN1, in there is the + * hash decrypted. We find it and confirm it + * matches the hash we computed ourselves. + * + * First step is generate the sig plaintext + */ + n = 4 + 32 + + 1 + + 4 + strlen(pss->ua->username) + + 4 + strlen(pss->ua->service) + + 4 + 9 + + 1 + + 4 + strlen(pss->ua->alg) + + 4 + pss->ua->pubkey_len; + + ps = sshd_zalloc(n); + if (!ps) { + lwsl_notice("OOM 4\n"); + goto ua_fail; + } + + pp = ps; + lws_buf(&pp, pss->session_id, 32); + *pp++ = SSH_MSG_USERAUTH_REQUEST; + lws_cstr(&pp, pss->ua->username, 64); + lws_cstr(&pp, pss->ua->service, 64); + lws_cstr(&pp, "publickey", 64); + *pp++ = 1; + lws_cstr(&pp, pss->ua->alg, 64); + lws_buf(&pp, pss->ua->pubkey, pss->ua->pubkey_len); + + /* Next hash the plaintext */ + + if (lws_genhash_init(&pss->ua->hash_ctx, + rsa_hash_alg_from_ident(pss->ua->alg))) { + lwsl_notice("genhash init failed\n"); + free(ps); + goto ua_fail; + } + + if (lws_genhash_update(&pss->ua->hash_ctx, ps, pp - ps)) { + lwsl_notice("genhash update failed\n"); + free(ps); + goto ua_fail; + } + lws_genhash_destroy(&pss->ua->hash_ctx, hash); + free(ps); + + /* + * Prepare the RSA decryption context: load in + * the E and N factors + */ +#if defined(LWS_USE_MBEDTLS) + ctx = sshd_zalloc(sizeof(*ctx)); + if (!ctx) + goto ua_fail; + mbedtls_rsa_init(ctx, MBEDTLS_RSA_PKCS_V15, 0); + + pp = pss->ua->pubkey; + m = lws_g32(&pp); + pp += m; + m = lws_g32(&pp); + if (mbedtls_mpi_read_binary(&ctx->E, pp, m)) + lwsl_notice("mpi load E failed\n"); + pp += m; + m = lws_g32(&pp); + + m = mbedtls_mpi_read_binary(&ctx->N, pp, m); + if (m) + lwsl_notice("mpi load N failed %d\n", m); +#else + /* Step 1: + * + * convert the MPI for e and n to OpenSSL BIGNUMs + */ + + pp = pss->ua->pubkey; + m = lws_g32(&pp); + pp += m; + m = lws_g32(&pp); + pp -= 4; + bn_e = BN_mpi2bn(pp, m + 4, NULL); + if (!bn_e) { + lwsl_notice("mpi load E failed\n"); + goto ua_fail; + } + pp += m + 4; + m = lws_g32(&pp); + pp -= 4; + bn_n = BN_mpi2bn(pp, m + 4, NULL); + if (!bn_n) { + lwsl_notice("mpi load N failed %d\n", m); + BN_free(bn_e); + bn_e = NULL; + goto ua_fail; + } + + /* Step 2: + * + * assemble the OpenSSL RSA from the BIGNUMs + */ + + rsa = RSA_new(); + if (!rsa) { + lwsl_notice("Failed to create RSA\n"); + BN_free(bn_e); + BN_free(bn_n); + goto ua_fail; + } +#if defined(LWS_HAVE_RSA_SET0_KEY) + if (RSA_set0_key(rsa, bn_n, bn_e, NULL) != 1) { + lwsl_notice("RSA_set0_key failed\n"); + BN_free(bn_e); + BN_free(bn_n); + goto ua_fail; + } + +#else + rsa->e = bn_e; + rsa->n = bn_n; +#endif +#endif + /* + * point to the encrypted signature payload we + * were sent + */ + pp = pss->ua->sig; + m = lws_g32(&pp); + pp += m; + m = lws_g32(&pp); +#if defined(LWS_USE_MBEDTLS) + ctx->len = m; +#endif + + /* + * decrypt it, resulting in an error or some + * ASN1 including the decrypted signature + */ + + otmp = sshd_zalloc(m); + if (!otmp) + /* ua_fail1 frees bn_e, bn_n and rsa */ + goto ua_fail1; +#if defined(LWS_USE_MBEDTLS) + m = mbedtls_rsa_rsaes_pkcs1_v15_decrypt(ctx, + NULL, NULL, MBEDTLS_RSA_PUBLIC, + &olen, pp, otmp, m); +#else + olen = 0; + m = RSA_public_decrypt((int)m, pp, otmp, rsa, + RSA_PKCS1_PADDING); + if (m != (uint32_t)-1) { + olen = m; + m = 0; + } + /* the bignums are also freed by freeing the RSA */ + RSA_free(rsa); +#endif + if (!m) { + /* the decrypted sig is in ASN1 format */ + m = 0; + while (m < olen) { + /* sig payload */ + if (otmp[m] == 0x04 && + otmp[m + 1] == lws_genhash_size( + pss->ua->hash_ctx.type)) { + m = memcmp(&otmp[m + 2], hash, + lws_genhash_size(pss->ua->hash_ctx.type)); + break; + } + /* go into these */ + if (otmp[m] == 0x30) { + m += 2; + continue; + } + /* otherwise skip payloads */ + m += otmp[m + 1] + 2; + } + } else + lwsl_notice("decrypt failed\n"); +#if defined(LWS_USE_MBEDTLS) + mbedtls_rsa_free(ctx); + free(ctx); +#endif + free(otmp); + /* + * if no good, m is nonzero and inform peer + */ + if (m) { + lwsl_notice("hash sig verify fail: %d\n", m); + goto ua_fail; + } + + /* if it checks out, inform peer */ + + lwsl_info("sig check OK\n"); + + /* Sect 5.1 RFC4252 + * + * SSH_MSG_USERAUTH_SUCCESS MUST be sent only once. + * When SSH_MSG_USERAUTH_SUCCESS has been sent, any + * further authentication requests received after that + * SHOULD be silently ignored. + */ + pss->ssh_auth_state = SSH_AUTH_STATE_GAVE_AUTH_IGNORE_REQS; + + write_task(pss, NULL, SSH_WT_UA_SUCCESS); + lws_ua_destroy(pss); + break; + + /* + * Channels + */ + + case SSHS_GET_U32: + pss->len = (pss->len << 8) | *p++; + if (++pss->ctr != 4) + break; + pss->ctr = 0; + pss->parser_state = pss->state_after_string; + goto again; + + /* + * Channel: Disconnect + */ + + case SSHS_NVC_DISCONNECT_REASON: + pss->disconnect_reason = pss->len; + state_get_string_alloc(pss, SSHS_NVC_DISCONNECT_DESC); + break; + + case SSHS_NVC_DISCONNECT_DESC: + pss->disconnect_desc = (char *)pss->last_alloc; + state_get_string(pss, SSHS_NVC_DISCONNECT_LANG); + break; + + case SSHS_NVC_DISCONNECT_LANG: + lwsl_notice("SSHS_NVC_DISCONNECT_LANG\n"); + if (pss->vhd->ops && pss->vhd->ops->disconnect_reason) + pss->vhd->ops->disconnect_reason( + pss->disconnect_reason, + pss->disconnect_desc, pss->name); + ssh_free(pss->last_alloc); + break; + + /* + * Channel: Open + */ + + case SSHS_NVC_CHOPEN_TYPE: + /* channel open */ + if (strcmp(pss->name, "session")) { + lwsl_notice("Failing on not session\n"); + pss->reason = 3; + goto ch_fail; + } + lwsl_info("SSHS_NVC_CHOPEN_TYPE: creating session\n"); + pss->ch_temp = sshd_zalloc(sizeof(*pss->ch_temp)); + if (!pss->ch_temp) + return -1; + + pss->ch_temp->type = SSH_CH_TYPE_SESSION; + state_get_u32(pss, SSHS_NVC_CHOPEN_SENDER_CH); + break; + + case SSHS_NVC_CHOPEN_SENDER_CH: + pss->ch_temp->sender_ch = pss->len; + state_get_u32(pss, SSHS_NVC_CHOPEN_WINSIZE); + break; + case SSHS_NVC_CHOPEN_WINSIZE: + lwsl_info("Initial window set to %d\n", pss->len); + pss->ch_temp->window = pss->len; + state_get_u32(pss, SSHS_NVC_CHOPEN_PKTSIZE); + break; + case SSHS_NVC_CHOPEN_PKTSIZE: + pss->ch_temp->max_pkt = pss->len; + pss->ch_temp->peer_window_est = LWS_SSH_INITIAL_WINDOW; + pss->ch_temp->server_ch = pss->next_ch_num++; + /* + * add us to channel list... leave as ch_temp + * as write task needs it and will NULL down + */ + lwsl_info("creating new session ch\n"); + pss->ch_temp->next = pss->ch_list; + pss->ch_list = pss->ch_temp; + if (pss->vhd->ops && pss->vhd->ops->channel_create) + pss->vhd->ops->channel_create(pss->wsi, + &pss->ch_temp->priv); + write_task(pss, pss->ch_temp, SSH_WT_CH_OPEN_CONF); + pss->parser_state = SSHS_MSG_EAT_PADDING; + break; + + /* + * SSH_MSG_CHANNEL_REQUEST + */ + + case SSHS_NVC_CHRQ_RECIP: + pss->ch_recip = pss->len; + state_get_string(pss, SSHS_NVC_CHRQ_TYPE); + break; + + case SSHS_NVC_CHRQ_TYPE: + pss->parser_state = SSHS_CHRQ_WANT_REPLY; + break; + + case SSHS_CHRQ_WANT_REPLY: + pss->rq_want_reply = *p++; + lwsl_info("SSHS_CHRQ_WANT_REPLY: %s, wantrep: %d\n", + pss->name, pss->rq_want_reply); + + pss->ch_temp = ssh_get_server_ch(pss, pss->ch_recip); + + /* after this they differ by the request */ + + /* + * a PTY for a shell + */ + if (!strcmp(pss->name, "pty-req")) { + state_get_string(pss, SSHS_NVC_CHRQ_TERM); + break; + } + /* + * a shell + */ + if (!strcmp(pss->name, "shell")) { + pss->channel_doing_spawn = pss->ch_temp->server_ch; + if (pss->vhd->ops && pss->vhd->ops->shell && + !pss->vhd->ops->shell(pss->ch_temp->priv, + pss->wsi)) { + if (pss->rq_want_reply) + write_task(pss, pss->ch_temp, + SSH_WT_CHRQ_SUCC); + pss->parser_state = SSHS_MSG_EAT_PADDING; + break; + } + + goto chrq_fail; + } + /* + * env vars to be set in the shell + */ + if (!strcmp(pss->name, "env")) { + state_get_string(pss, SSHS_NVC_CHRQ_ENV_NAME); + break; + } + + /* + * exec something + */ + if (!strcmp(pss->name, "exec")) { + state_get_string_alloc(pss, SSHS_NVC_CHRQ_EXEC_CMD); + break; + } + + /* + * spawn a subsystem + */ + if (!strcmp(pss->name, "subsystem")) { + lwsl_notice("subsystem\n"); + state_get_string_alloc(pss, + SSHS_NVC_CHRQ_SUBSYSTEM); + break; + } + + if (pss->rq_want_reply) + goto chrq_fail; + + pss->parser_state = SSH_KEX_STATE_SKIP; + break; + + /* CHRQ pty-req */ + + case SSHS_NVC_CHRQ_TERM: + strncpy(pss->args.pty.term, pss->name, + sizeof(pss->args.pty.term) - 1); + state_get_u32(pss, SSHS_NVC_CHRQ_TW); + break; + case SSHS_NVC_CHRQ_TW: + pss->args.pty.width_ch = pss->len; + state_get_u32(pss, SSHS_NVC_CHRQ_TH); + break; + case SSHS_NVC_CHRQ_TH: + pss->args.pty.height_ch = pss->len; + state_get_u32(pss, SSHS_NVC_CHRQ_TWP); + break; + case SSHS_NVC_CHRQ_TWP: + pss->args.pty.width_px = pss->len; + state_get_u32(pss, SSHS_NVC_CHRQ_THP); + break; + case SSHS_NVC_CHRQ_THP: + pss->args.pty.height_px = pss->len; + state_get_string_alloc(pss, SSHS_NVC_CHRQ_MODES); + break; + case SSHS_NVC_CHRQ_MODES: + /* modes is a stream of byte-pairs, not a string */ + pss->args.pty.modes = (char *)pss->last_alloc; + pss->args.pty.modes_len = pss->npos; + n = 0; + if (pss->vhd->ops && pss->vhd->ops->pty_req) + n = pss->vhd->ops->pty_req(pss->ch_temp->priv, + &pss->args.pty); + ssh_free(pss->last_alloc); + if (n) + goto chrq_fail; + if (pss->rq_want_reply) + write_task(pss, pss->ch_temp, SSH_WT_CHRQ_SUCC); + pss->parser_state = SSHS_MSG_EAT_PADDING; + break; + + /* CHRQ env */ + + case SSHS_NVC_CHRQ_ENV_NAME: + strcpy(pss->args.aux, pss->name); + state_get_string(pss, SSHS_NVC_CHRQ_ENV_VALUE); + break; + + case SSHS_NVC_CHRQ_ENV_VALUE: + if (pss->vhd->ops && pss->vhd->ops->set_env) + if (pss->vhd->ops->set_env(pss->ch_temp->priv, + pss->args.aux, pss->name)) + goto chrq_fail; + pss->parser_state = SSHS_MSG_EAT_PADDING; + break; + + /* CHRQ exec */ + + case SSHS_NVC_CHRQ_EXEC_CMD: + /* + * byte SSH_MSG_CHANNEL_REQUEST + * uint32 recipient channel + * string "exec" + * boolean want reply + * string command + * + * This message will request that the server start the + * execution of the given command. The 'command' string + * may contain a path. Normal precautions MUST be taken + * to prevent the execution of unauthorized commands. + * + * scp sends "scp -t /path/..." + */ + lwsl_info("exec cmd: %s %02X\n", pss->last_alloc, *p); + + pss->channel_doing_spawn = pss->ch_temp->server_ch; + + if (pss->vhd->ops && pss->vhd->ops->exec && + !pss->vhd->ops->exec(pss->ch_temp->priv, pss->wsi, + (const char *)pss->last_alloc)) { + ssh_free(pss->last_alloc); + if (pss->rq_want_reply) + write_task(pss, pss->ch_temp, + SSH_WT_CHRQ_SUCC); + + pss->parser_state = SSHS_MSG_EAT_PADDING; + break; + } + + /* + * even if he doesn't want to exec it, we know how to + * fake scp + */ + + /* we only alloc "exec" of scp for scp destination */ + n = 1; + if (pss->last_alloc[0] != 's' || + pss->last_alloc[1] != 'c' || + pss->last_alloc[2] != 'p' || + pss->last_alloc[3] != ' ') + /* disallow it */ + n = 0; + + ssh_free(pss->last_alloc); + if (!n) + goto chrq_fail; + + /* our channel speaks SCP protocol now */ + + scp = sshd_zalloc(sizeof(*scp)); + if (!scp) + return -1; + + pss->ch_temp->type = SSH_CH_TYPE_SCP; + pss->ch_temp->sub = (lws_subprotocol *)scp; + + scp->ips = SSHS_SCP_COLLECTSTR; + + if (pss->rq_want_reply) + write_task(pss, pss->ch_temp, SSH_WT_CHRQ_SUCC); + + /* we start the scp protocol first by sending an ACK */ + write_task(pss, pss->ch_temp, SSH_WT_SCP_ACK_OKAY); + + pss->parser_state = SSHS_MSG_EAT_PADDING; + break; + + case SSHS_NVC_CHRQ_SUBSYSTEM: + lwsl_notice("subsystem: %s", pss->last_alloc); + n = 0; +#if 0 + if (!strcmp(pss->name, "sftp")) { + lwsl_notice("SFTP session\n"); + pss->ch_temp->type = SSH_CH_TYPE_SFTP; + n = 1; + } +#endif + ssh_free(pss->last_alloc); +// if (!n) + goto ch_fail; +#if 0 + if (pss->rq_want_reply) + write_task(pss, ssh_get_server_ch(pss, + pss->ch_recip), SSH_WT_CHRQ_SUCC); + pss->parser_state = SSHS_MSG_EAT_PADDING; + break; +#endif + + /* SSH_MSG_CHANNEL_DATA */ + + case SSHS_NVC_CD_RECIP: + pss->ch_recip = pss->len; + + ch = ssh_get_server_ch(pss, pss->ch_recip); + ch->peer_window_est -= pss->msg_len; + + if (pss->msg_len < sizeof(pss->name)) + state_get_string(pss, SSHS_NVC_CD_DATA); + else + state_get_string_alloc(pss, + SSHS_NVC_CD_DATA_ALLOC); + break; + + case SSHS_NVC_CD_DATA_ALLOC: + case SSHS_NVC_CD_DATA: + /* + * Actual protocol incoming payload + */ + if (pss->parser_state == SSHS_NVC_CD_DATA_ALLOC) + pp = pss->last_alloc; + else + pp = (uint8_t *)pss->name; + lwsl_info("SSHS_NVC_CD_DATA\n"); + + ch = ssh_get_server_ch(pss, pss->ch_recip); + switch (ch->type) { + case SSH_CH_TYPE_SCP: + scp = &ch->sub->scp; + switch (scp->ips) { + case SSHS_SCP_COLLECTSTR: + /* gather the ascii-coded headers */ + for (n = 0; n < (int)pss->npos; n++) + lwsl_notice("0x%02X %c\n", + pp[n], pp[n]); + + /* Header triggers the transfer? */ + if (pp[0] == 'C' && pp[pss->npos - 1] == '\x0a') { + while (*pp != ' ' && *pp != '\x0a') + pp++; + if (*pp++ != ' ') { + write_task(pss, ch, + SSH_WT_SCP_ACK_ERROR); + pss->parser_state = SSHS_MSG_EAT_PADDING; + break; + } + scp->len = atoll((const char *)pp); + lwsl_notice("scp payload %llu expected\n", + (unsigned long long)scp->len); + scp->ips = SSHS_SCP_PAYLOADIN; + } + /* ack it */ + write_task(pss, pss->ch_temp, + SSH_WT_SCP_ACK_OKAY); + break; + case SSHS_SCP_PAYLOADIN: + /* the scp file payload */ + if (pss->vhd->ops) + pss->vhd->ops->rx(ch->priv, + pss->wsi, pp, pss->npos); + if (scp->len >= pss->npos) + scp->len -= pss->npos; + else + scp->len = 0; + if (!scp->len) { + lwsl_notice("scp txfer completed\n"); + scp->ips = SSHS_SCP_COLLECTSTR; + break; + } + break; + } + break; + default: /* scp payload */ + if (pss->vhd->ops) + pss->vhd->ops->rx(ch->priv, pss->wsi, + pp, pss->npos); + break; + } + if (pss->parser_state == SSHS_NVC_CD_DATA_ALLOC) + ssh_free(pss->last_alloc); + + if (ch->peer_window_est < 32768) { + write_task(pss, ch, SSH_WT_WINDOW_ADJUST); + ch->peer_window_est += 32768; + lwsl_notice("extra peer WINDOW_ADJUST (~ %d)\n", + ch->peer_window_est); + } + + pss->parser_state = SSHS_MSG_EAT_PADDING; + break; + + case SSHS_NVC_WA_RECIP: + pss->ch_recip = pss->len; + state_get_u32(pss, SSHS_NVC_WA_ADD); + break; + + case SSHS_NVC_WA_ADD: + ch = ssh_get_server_ch(pss, pss->ch_recip); + if (ch) { + ch->window += pss->len; + lwsl_notice("got additional window %d (now %d)\n", + pss->len, ch->window); + } + pss->parser_state = SSHS_MSG_EAT_PADDING; + break; + + /* + * channel close + */ + + case SSHS_NVC_CH_EOF: + /* + * No explicit response is sent to this + * message. However, the application may send + * EOF to whatever is at the other end of the + * channel. Note that the channel remains open + * after this message, and more data may still + * be sent in the other direction. This message + * does not consume window space and can be sent + * even if no window space is available. + */ + lwsl_notice("SSH_MSG_CHANNEL_EOF: %d\n", pss->ch_recip); + ch = ssh_get_server_ch(pss, pss->ch_recip); + if (!ch) + return -1; + + if (!ch->had_eof) { + ch->had_eof = 1; + write_task(pss, ch, SSH_WT_CH_CLOSE); + } + pss->parser_state = SSHS_MSG_EAT_PADDING; + break; + + case SSHS_NVC_CH_CLOSE: + /* + * When either party wishes to terminate the + * channel, it sends SSH_MSG_CHANNEL_CLOSE. + * Upon receiving this message, a party MUST + * send back an SSH_MSG_CHANNEL_CLOSE unless it + * has already sent this message for the + * channel. The channel is considered closed + * for a party when it has both sent and + * received SSH_MSG_CHANNEL_CLOSE, and the + * party may then reuse the channel number. + * A party MAY send SSH_MSG_CHANNEL_CLOSE + * without having sent or received + * SSH_MSG_CHANNEL_EOF. + */ + lwsl_notice("SSH_MSG_CHANNEL_CLOSE ch %d\n", + pss->ch_recip); + ch = ssh_get_server_ch(pss, pss->ch_recip); + if (!ch) + goto bail; + + pss->parser_state = SSHS_MSG_EAT_PADDING; + + if (ch->sent_close) { + /* + * This is acking our sent close... + * we can destroy the channel with no + * further communication. + */ + ssh_destroy_channel(pss, ch); + break; + } + + ch->received_close = 1; + write_task(pss, ch, SSH_WT_CH_CLOSE); + break; + + default: + break; + +chrq_fail: + lwsl_notice("chrq_fail\n"); + write_task(pss, pss->ch_temp, SSH_WT_CHRQ_FAILURE); + pss->parser_state = SSH_KEX_STATE_SKIP; + break; + +ch_fail: + if (pss->ch_temp) { + free(pss->ch_temp); + pss->ch_temp = NULL; + } + write_task(pss, pss->ch_temp, SSH_WT_CH_FAILURE); + pss->parser_state = SSH_KEX_STATE_SKIP; + break; + +ua_fail1: +#if defined(LWS_USE_MBEDTLS) + mbedtls_rsa_free(ctx); + free(ctx); +#else + /* also frees the bignums */ + RSA_free(rsa); +#endif +ua_fail: + write_task(pss, NULL, SSH_WT_UA_FAILURE); +ua_fail_silently: + lws_ua_destroy(pss); + /* Sect 4, RFC4252 + * + * Additionally, the implementation SHOULD limit the + * number of failed authentication attempts a client + * may perform in a single session (the RECOMMENDED + * limit is 20 attempts). If the threshold is + * exceeded, the server SHOULD disconnect. + */ + if (pss->count_auth_attempts++ > 20) + goto bail; + + pss->parser_state = SSH_KEX_STATE_SKIP; + break; + } + + pss->pos++; + } + + return 0; +bail: + lws_kex_destroy(pss); + lws_ua_destroy(pss); + + return SSH_DISCONNECT_KEY_EXCHANGE_FAILED; +} + +static int +parse(struct per_session_data__sshd *pss, uint8_t *p, size_t len) +{ + while (len--) { + + if (pss->copy_to_I_C && pss->kex->I_C_payload_len < + pss->kex->I_C_alloc_len && + pss->parser_state != SSHS_MSG_EAT_PADDING) + pss->kex->I_C[pss->kex->I_C_payload_len++] = *p; + + if (pss->active_keys_cts.valid && + pss->parser_state == SSHS_MSG_LEN) + /* take a copy for full decrypt */ + pss->packet_assembly[pss->pa_pos++] = *p; + + if (pss->active_keys_cts.valid && + pss->parser_state == SSHS_MSG_PADDING && + pss->msg_len) { + /* we are going to have to decrypt it */ + uint32_t cp, l = pss->msg_len + 4 + + pss->active_keys_cts.MAC_length; + uint8_t pt[2048]; + + len++; + cp = len; + + if (cp > l - pss->pa_pos) + cp = l - pss->pa_pos; + + if (cp > sizeof(pss->packet_assembly) - + pss->pa_pos) { + lwsl_err("Packet is too big to decrypt\n"); + + goto bail; + } + if (pss->msg_len < 2 + 4) { + lwsl_err("packet too small\n"); + + goto bail; + } + + memcpy(&pss->packet_assembly[pss->pa_pos], p, cp); + pss->pa_pos += cp; + len -= cp; + p += cp; + + if (pss->pa_pos != l) + return 0; + + /* decrypt it */ + cp = lws_chacha_decrypt(&pss->active_keys_cts, + pss->ssh_sequence_ctr_cts++, + pss->packet_assembly, + pss->pa_pos, pt); + if (cp) { + lwsl_notice("Decryption failed: %d\n", cp); + goto bail; + } + + if (lws_ssh_parse_plaintext(pss, pt + 4, pss->msg_len)) + goto bail; + + pss->pa_pos = 0; + pss->ctr = 0; + continue; + } + + if (lws_ssh_parse_plaintext(pss, p, 1)) + goto bail; + + p++; + } + + return 0; + +bail: + lws_kex_destroy(pss); + lws_ua_destroy(pss); + + return SSH_DISCONNECT_KEY_EXCHANGE_FAILED; +} + +static uint32_t +pad_and_encrypt(uint8_t *dest, void *ps, uint8_t *pp, + struct per_session_data__sshd *pss, int skip_pad) +{ + uint32_t n; + + if (!skip_pad) + lws_pad_set_length(pss, ps, &pp, &pss->active_keys_stc); + n = pp - (uint8_t *)ps; + + if (!pss->active_keys_stc.valid) { + memcpy(dest, ps, n); + return n; + } + + lws_chacha_encrypt(&pss->active_keys_stc, pss->ssh_sequence_ctr_stc, + ps, n, dest); + n += pss->active_keys_stc.MAC_length; + + return n; +} + +static int +lws_callback_raw_sshd(struct lws *wsi, enum lws_callback_reasons reason, + void *user, void *in, size_t len) +{ + struct per_session_data__sshd *pss = + (struct per_session_data__sshd *)user, **p; + struct per_vhost_data__sshd *vhd = NULL; + uint8_t buf[LWS_PRE + 1024], *pp, *ps = &buf[LWS_PRE + 512]; + const struct lws_protocol_vhost_options *pvo; + const struct lws_protocols *prot; + struct lws_ssh_channel *ch; + char lang[10]; + int n, m, o; + + /* + * Because we are an abstract protocol plugin, we will get called by + * wsi that actually bind to a plugin "on top of us" that calls thru + * to our callback. + * + * Under those circumstances, we can't simply get a pointer to our own + * protocol from the wsi. If there's a pss already, we can get it from + * there, but the first time for each connection we have to look it up. + */ + if (pss && pss->vhd) + vhd = (struct per_vhost_data__sshd *) + lws_protocol_vh_priv_get(lws_get_vhost(wsi), + pss->vhd->protocol); + else + vhd = (struct per_vhost_data__sshd *) + lws_protocol_vh_priv_get(lws_get_vhost(wsi), + lws_vhost_name_to_protocol( + lws_get_vhost(wsi), "lws-ssh-base")); + + if (!vhd && reason != LWS_CALLBACK_PROTOCOL_INIT) + return -1; + + switch ((int)reason) { + case LWS_CALLBACK_PROTOCOL_INIT: + vhd = lws_protocol_vh_priv_zalloc(lws_get_vhost(wsi), + lws_get_protocol(wsi), + sizeof(struct per_vhost_data__sshd)); + vhd->context = lws_get_context(wsi); + vhd->protocol = lws_get_protocol(wsi); + vhd->vhost = lws_get_vhost(wsi); + + pvo = (const struct lws_protocol_vhost_options *)in; + while (pvo) { + /* + * the user code passes the ops struct address to us + * using a pvo (per-vhost option) + */ + if (!strcmp(pvo->name, "ops")) + vhd->ops = (const struct lws_ssh_ops *)pvo->value; + + /* + * the user code is telling us to get the ops struct + * from another protocol's protocol.user pointer + */ + if (!strcmp(pvo->name, "ops-from")) { + prot = lws_vhost_name_to_protocol(vhd->vhost, + pvo->value); + if (prot) + vhd->ops = (const struct lws_ssh_ops *)prot->user; + else + lwsl_err("%s: can't find protocol %s\n", + __func__, pvo->value); + } + + pvo = pvo->next; + } + + if (!vhd->ops) { + lwsl_err("ssh pvo \"ops\" is mandatory\n"); + return 1; + } + /* + * The user code ops api_version has to be current + */ + if (vhd->ops->api_version != LWS_SSH_OPS_VERSION) { + lwsl_err("FATAL ops is api_version v%d but code is v%d", + vhd->ops->api_version, LWS_SSH_OPS_VERSION); + return 1; + } + break; + + case LWS_CALLBACK_RAW_ADOPT: + lwsl_info("LWS_CALLBACK_RAW_ADOPT\n"); + pss->next = vhd->live_pss_list; + vhd->live_pss_list = pss; + pss->parser_state = SSH_INITIALIZE_TRANSIENT; + pss->wsi = wsi; + pss->vhd = vhd; + pss->kex_state = KEX_STATE_EXPECTING_CLIENT_OFFER; + pss->active_keys_cts.padding_alignment = 8; + pss->active_keys_stc.padding_alignment = 8; + if (lws_kex_create(pss)) + return -1; + write_task(pss, NULL, SSH_WT_VERSION); + + /* sect 4 RFC4252 + * + * The server SHOULD have a timeout for authentication and + * disconnect if the authentication has not been accepted + * within the timeout period. + * + * The RECOMMENDED timeout period is 10 minutes. + */ + lws_set_timeout(wsi, + SSH_PENDING_TIMEOUT_CONNECT_TO_SUCCESSFUL_AUTH, 10 * 60); + break; + + case LWS_CALLBACK_RAW_CLOSE: + lwsl_info("LWS_CALLBACK_RAW_CLOSE\n"); + lws_kex_destroy(pss); + lws_ua_destroy(pss); + + while (pss->ch_list) + ssh_destroy_channel(pss, pss->ch_list); + + lws_chacha_destroy(&pss->active_keys_cts); + lws_chacha_destroy(&pss->active_keys_stc); + + p = &vhd->live_pss_list; + + while (*p) { + if ((*p) == pss) { + *p = pss->next; + continue; + } + p = &((*p)->next); + } + break; + + case LWS_CALLBACK_RAW_RX: + if (parse(pss, in, len)) + return -1; + break; + + case LWS_CALLBACK_RAW_WRITEABLE: + n = 0; + o = pss->write_task[pss->wt_tail]; + ch = pss->write_channel[pss->wt_tail]; + + if (pss->wt_head == pss->wt_tail) + o = SSH_WT_NONE; + + switch (o) { + case SSH_WT_VERSION: + if (!pss->vhd) + break; + n = lws_snprintf((char *)buf + LWS_PRE, + sizeof(buf) - LWS_PRE - 1, "%s\r\n", + pss->vhd->ops->server_string); + write_task(pss, NULL, SSH_WT_OFFER); + break; + + case SSH_WT_OFFER: + if (!pss->vhd) + break; + m = 0; + n = offer(pss, buf + LWS_PRE, + sizeof(buf) - LWS_PRE, 0, &m); + if (n == 0) { + lwsl_notice("Too small\n"); + + return -1; + } + + if (!pss->kex) { + lwsl_notice("%s: SSH_WT_OFFER: pss->kex is NULL\n", + __func__); + return -1; + } + + /* we need a copy of it to generate the hash later */ + if (pss->kex->I_S) + free(pss->kex->I_S); + pss->kex->I_S = sshd_zalloc(m); + if (!pss->kex->I_S) { + lwsl_notice("OOM 5: %d\n", m); + + return -1; + } + /* without length + padcount part */ + memcpy(pss->kex->I_S, buf + LWS_PRE + 5, m); + pss->kex->I_S_payload_len = m; /* without padding */ + break; + + case SSH_WT_OFFER_REPLY: + memcpy(ps, pss->kex->kex_r, pss->kex->kex_r_len); + n = pad_and_encrypt(&buf[LWS_PRE], ps, + ps + pss->kex->kex_r_len, pss, 1); + pss->kex_state = KEX_STATE_REPLIED_TO_OFFER; + /* afterwards, must do newkeys */ + write_task(pss, NULL, SSH_WT_SEND_NEWKEYS); + break; + + case SSH_WT_SEND_NEWKEYS: + pp = ps + 5; + *pp++ = SSH_MSG_NEWKEYS; + goto pac; + + case SSH_WT_UA_ACCEPT: + /* + * If the server supports the service (and permits + * the client to use it), it MUST respond with the + * following: + * + * byte SSH_MSG_SERVICE_ACCEPT + * string service name + */ + pp = ps + 5; + *pp++ = SSH_MSG_SERVICE_ACCEPT; + lws_p32(pp, pss->npos); + pp += 4; + strcpy((char *)pp, pss->name); + pp += pss->npos; + goto pac; + + case SSH_WT_UA_FAILURE: + pp = ps + 5; + *pp++ = SSH_MSG_USERAUTH_FAILURE; + lws_p32(pp, 9); + pp += 4; + strcpy((char *)pp, "publickey"); + pp += 9; + *pp++ = 0; + goto pac; + + case SSH_WT_UA_BANNER: + pp = ps + 5; + *pp++ = SSH_MSG_USERAUTH_BANNER; + if (pss->vhd && pss->vhd->ops->banner) + n = pss->vhd->ops->banner((char *)&buf[650], + 150 - 1, + lang, sizeof(lang)); + lws_p32(pp, n); + pp += 4; + strcpy((char *)pp, (char *)&buf[650]); + pp += n; + if (lws_cstr(&pp, lang, sizeof(lang))) + goto bail; + goto pac; + + case SSH_WT_UA_PK_OK: + /* + * The server MUST respond to this message with + * either SSH_MSG_USERAUTH_FAILURE or with the + * following: + * + * byte SSH_MSG_USERAUTH_PK_OK + * string public key alg name from the request + * string public key blob from the request + */ + n = 74 + pss->ua->pubkey_len; + if (n > sizeof(buf) - LWS_PRE) { + lwsl_notice("pubkey too large\n"); + goto bail; + } + ps = sshd_zalloc(n); + if (!ps) + goto bail; + pp = ps + 5; + *pp++ = SSH_MSG_USERAUTH_PK_OK; + if (lws_cstr(&pp, pss->ua->alg, 64)) { + free(ps); + goto bail; + } + lws_p32(pp, pss->ua->pubkey_len); + pp += 4; + memcpy(pp, pss->ua->pubkey, pss->ua->pubkey_len); + pp += pss->ua->pubkey_len; + + /* we no longer need the UA now we judged it */ + lws_ua_destroy(pss); + + goto pac; + + case SSH_WT_UA_SUCCESS: + pp = ps + 5; + *pp++ = SSH_MSG_USERAUTH_SUCCESS; + /* end SSH_PENDING_TIMEOUT_CONNECT_TO_SUCCESSFUL_AUTH */ + lws_set_timeout(wsi, NO_PENDING_TIMEOUT, 0); + goto pac; + + case SSH_WT_CH_OPEN_CONF: + pp = ps + 5; + *pp++ = SSH_MSG_CHANNEL_OPEN_CONFIRMATION; + lws_p32(pp, pss->ch_temp->server_ch); + pp += 4; + lws_p32(pp, pss->ch_temp->sender_ch); + pp += 4; + /* tx initial window size towards us */ + lws_p32(pp, LWS_SSH_INITIAL_WINDOW); + pp += 4; + /* maximum packet size towards us */ + lws_p32(pp, 800); + pp += 4; + lwsl_info("SSH_WT_CH_OPEN_CONF\n"); + /* it's on the linked-list */ + pss->ch_temp = NULL; + goto pac; + + case SSH_WT_CH_FAILURE: + pp = ps + 5; + *pp++ = SSH_MSG_CHANNEL_OPEN_FAILURE; + lws_p32(pp, ch->server_ch); + pp += 4; + lws_p32(pp, ch->sender_ch); + pp += 4; + lws_cstr(&pp, "reason", 64); + lws_cstr(&pp, "en/US", 64); + lwsl_info("SSH_WT_CH_FAILURE\n"); + goto pac; + + case SSH_WT_CHRQ_SUCC: + pp = ps + 5; + *pp++ = SSH_MSG_CHANNEL_SUCCESS; + lws_p32(pp, ch->server_ch); + lwsl_info("SSH_WT_CHRQ_SUCC\n"); + pp += 4; + goto pac; + + case SSH_WT_CHRQ_FAILURE: + pp = ps + 5; + *pp++ = SSH_MSG_CHANNEL_FAILURE; + lws_p32(pp, ch->server_ch); + pp += 4; + lwsl_info("SSH_WT_CHRQ_FAILURE\n"); + goto pac; + + case SSH_WT_CH_CLOSE: + pp = ps + 5; + *pp++ = SSH_MSG_CHANNEL_CLOSE; + lws_p32(pp, ch->server_ch); + lwsl_info("SSH_WT_CH_CLOSE\n"); + pp += 4; + goto pac; + + case SSH_WT_CH_EOF: + pp = ps + 5; + *pp++ = SSH_MSG_CHANNEL_EOF; + lws_p32(pp, ch->server_ch); + lwsl_info("SSH_WT_CH_EOF\n"); + pp += 4; + goto pac; + + case SSH_WT_SCP_ACK_ERROR: + case SSH_WT_SCP_ACK_OKAY: + pp = ps + 5; + *pp++ = SSH_MSG_CHANNEL_DATA; + /* ps + 6 */ + lws_p32(pp, ch->sender_ch); + pp += 4; + lws_p32(pp, 1); + pp += 4; + if (o == SSH_WT_SCP_ACK_ERROR) + *pp++ = 2; + else + *pp++ = 0; + lwsl_info("SSH_WT_SCP_ACK_OKAY\n"); + goto pac; + + case SSH_WT_WINDOW_ADJUST: + pp = ps + 5; + *pp++ = SSH_MSG_CHANNEL_WINDOW_ADJUST; + /* ps + 6 */ + lws_p32(pp, ch->sender_ch); + pp += 4; + lws_p32(pp, 32768); + pp += 4; + lwsl_info("send SSH_MSG_CHANNEL_WINDOW_ADJUST\n"); + goto pac; + + case SSH_WT_NONE: + default: + /* sending payload */ + + ch = ssh_get_server_ch(pss, 0); + /* have a channel up to send on? */ + if (!ch) + break; + + if (!pss->vhd || !pss->vhd->ops) + break; + n = pss->vhd->ops->tx_waiting(ch->priv); + if (n < 0) + return -1; + if (!n) + /* nothing to send */ + break; + + if (n == (LWS_STDOUT | LWS_STDERR)) { + /* pick one using round-robin */ + if (pss->serviced_stderr_last) + n = LWS_STDOUT; + else + n = LWS_STDERR; + } + + pss->serviced_stderr_last = !!(n & LWS_STDERR); + + /* stdout or stderr */ + pp = ps + 5; + if (n == LWS_STDOUT) + *pp++ = SSH_MSG_CHANNEL_DATA; + else + *pp++ = SSH_MSG_CHANNEL_EXTENDED_DATA; + /* ps + 6 */ + lws_p32(pp, pss->ch_list->server_ch); + m = 14; + if (n == LWS_STDERR) { + pp += 4; + /* data type code... 1 for stderr payload */ + lws_p32(pp, SSH_EXTENDED_DATA_STDERR); + m = 18; + } + /* also skip another strlen u32 at + 10 / +14 */ + pp += 8; + /* ps + 14 / + 18 */ + + pp += pss->vhd->ops->tx(ch->priv, n, pp, + &buf[sizeof(buf) - 1] - pp); + + lws_p32(ps + m - 4, pp - (ps + m)); + + if (pss->vhd->ops->tx_waiting(ch->priv) > 0) + lws_callback_on_writable(wsi); + + ch->window -= (pp - ps) - m; + //lwsl_debug("our send window: %d\n", ch->window); + + /* fallthru */ +pac: + if (!pss->vhd) + break; + n = pad_and_encrypt(&buf[LWS_PRE], ps, pp, pss, 0); + break; + +bail: + lws_ua_destroy(pss); + lws_kex_destroy(pss); + + return 1; + + } + + if (n > 0) { + m = lws_write(wsi, (unsigned char *)buf + LWS_PRE, n, + LWS_WRITE_HTTP); + + switch(o) { + case SSH_WT_SEND_NEWKEYS: + lwsl_info("Activating STC keys\n"); + pss->active_keys_stc = pss->kex->keys_next_stc; + lws_chacha_activate(&pss->active_keys_stc); + pss->kex_state = KEX_STATE_CRYPTO_INITIALIZED; + pss->kex->newkeys |= 1; + if (pss->kex->newkeys == 3) + lws_kex_destroy(pss); + break; + case SSH_WT_UA_PK_OK: + free(ps); + break; + case SSH_WT_CH_CLOSE: + if (ch->received_close) { + /* + * We are sending this at the behest of + * the remote peer... + * we can destroy the channel with no + * further communication. + */ + ssh_destroy_channel(pss, ch); + break; + } + ch->sent_close = 1; + break; + } + if (m < 0) { + lwsl_err("ERR %d from write\n", m); + goto bail; + } + + if (o != SSH_WT_VERSION) + pss->ssh_sequence_ctr_stc++; + + if (o != SSH_WT_NONE) + pss->wt_tail = + (pss->wt_tail + 1) & 3; + } else + if (o == SSH_WT_UA_PK_OK) /* free it either way */ + free(ps); + + ch = ssh_get_server_ch(pss, 0); + + if (pss->wt_head != pss->wt_tail || + (ch && ch->priv && pss->vhd && + pss->vhd->ops->tx_waiting(ch->priv))) + lws_callback_on_writable(wsi); + + break; + + case LWS_CALLBACK_SSH_UART_SET_RXFLOW: + /* + * this is sent to set rxflow state on any connections that + * sink on a particular sink. The sink index affected is in len + * + * More than one protocol may sink to the same uart, and the + * protocol may select the sink itself, eg, in the URL used + * to set up the connection. + */ + lwsl_notice("sshd LWS_CALLBACK_SSH_UART_SET_RXFLOW: wsi %p, %d\n", + wsi, (int)len & 1); + lws_rx_flow_control(wsi, len & 1); + break; + + case LWS_CALLBACK_CGI: + if (pss->vhd && pss->vhd->ops && + pss->vhd->ops->child_process_io && + pss->vhd->ops->child_process_io(pss->ch_temp->priv, + pss->wsi, (struct lws_cgi_args *)in)) + return -1; + break; + + case LWS_CALLBACK_CGI_PROCESS_ATTACH: + ch = ssh_get_server_ch(pss, pss->channel_doing_spawn); + if (ch) { + ch->spawn_pid = len; /* child process PID */ + lwsl_notice("associated PID %d to ch %d\n", (int)len, + pss->channel_doing_spawn); + } + break; + + case LWS_CALLBACK_CGI_TERMINATED: + if (pss->vhd && pss->vhd->ops && + pss->vhd->ops->child_process_terminated) + pss->vhd->ops->child_process_terminated(pss->ch_temp->priv, + pss->wsi); + /* + * we have the child PID in len... we need to match it to a + * channel that is on the wsi + */ + ch = pss->ch_list; + + while (ch) { + if (ch->spawn_pid == len) { + lwsl_notice("starting close of ch with PID %d\n", + (int)len); + write_task(pss, ch, SSH_WT_CH_CLOSE); + break; + } + ch = ch->next; + } + break; + + default: + break; + } + + return 0; +} + +#define LWS_PLUGIN_PROTOCOL_LWS_RAW_SSHD { \ + "lws-ssh-base", \ + lws_callback_raw_sshd, \ + sizeof(struct per_session_data__sshd), \ + 1024, 0, NULL, 900 \ + } + +LWS_VISIBLE const struct lws_protocols protocols_sshd[] = { + LWS_PLUGIN_PROTOCOL_LWS_RAW_SSHD, + { NULL, NULL, 0, 0, 0, NULL, 0 } /* terminator */ +}; + +#if !defined (LWS_PLUGIN_STATIC) + +LWS_VISIBLE int +init_protocol_lws_ssh_base(struct lws_context *context, + struct lws_plugin_capability *c) +{ + if (c->api_magic != LWS_PLUGIN_API_MAGIC) { + lwsl_err("Plugin API %d, library API %d", LWS_PLUGIN_API_MAGIC, + c->api_magic); + return 1; + } + + c->protocols = protocols_sshd; + c->count_protocols = ARRAY_SIZE(protocols_sshd); + c->extensions = NULL; + c->count_extensions = 0; + + return 0; +} + +LWS_VISIBLE int +destroy_protocol_lws_ssh_base(struct lws_context *context) +{ + return 0; +} +#endif diff --git a/plugins/ssh-base/telnet.c b/plugins/ssh-base/telnet.c new file mode 100644 index 000000000..62d7a808e --- /dev/null +++ b/plugins/ssh-base/telnet.c @@ -0,0 +1,260 @@ +/* + * libwebsockets - lws-plugin-ssh-base + * + * Copyright (C) 2017 Andy Green + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation: + * version 2.1 of the License. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, + * MA 02110-1301 USA + */ + +#include "libwebsockets.h" +#include "lws-ssh.h" + +#include + +struct per_vhost_data__telnet { + struct lws_context *context; + struct lws_vhost *vhost; + const struct lws_protocols *protocol; + struct per_session_data__telnet *live_pss_list; + const struct lws_ssh_ops *ops; +}; + +struct per_session_data__telnet { + struct per_session_data__telnet *next; + struct per_vhost_data__telnet *vhd; + uint32_t rx_tail; + void *priv; + + uint32_t initial:1; + + char state; + uint8_t cmd; +}; + +enum { + LTS_BINARY_XMIT, + LTS_ECHO, + LTS_SUPPRESS_GA, + + + LTSC_SUBOPT_END = 240, + LTSC_BREAK = 243, + LTSC_SUBOPT_START = 250, + LTSC_WILL = 251, + LTSC_WONT, + LTSC_DO, + LTSC_DONT, + LTSC_IAC, + + LTST_WAIT_IAC = 0, + LTST_GOT_IAC, + LTST_WAIT_OPT, +}; + +static int +telnet_ld(struct per_session_data__telnet *pss, uint8_t c) +{ + switch (pss->state) { + case LTST_WAIT_IAC: + if (c == LTSC_IAC) { + pss->state = LTST_GOT_IAC; + return 0; + } + return 1; + + case LTST_GOT_IAC: + pss->state = LTST_WAIT_IAC; + + switch (c) { + case LTSC_BREAK: + return 0; + case LTSC_WILL: + case LTSC_WONT: + case LTSC_DO: + case LTSC_DONT: + pss->cmd = c; + pss->state = LTST_WAIT_OPT; + return 0; + case LTSC_IAC: + return 1; /* double IAC */ + } + return 0; /* ignore unknown */ + + case LTST_WAIT_OPT: + lwsl_notice(" tld: cmd %d: opt %d\n", pss->cmd, c); + pss->state = LTST_WAIT_IAC; + return 0; + } + + return 0; +} + +static uint8_t init[] = { + LTSC_IAC, LTSC_WILL, 3, + LTSC_IAC, LTSC_WILL, 1, + LTSC_IAC, LTSC_DONT, 1, + LTSC_IAC, LTSC_DO, 0 +}; + +static int +lws_callback_raw_telnet(struct lws *wsi, enum lws_callback_reasons reason, + void *user, void *in, size_t len) +{ + struct per_session_data__telnet *pss = + (struct per_session_data__telnet *)user, **p; + struct per_vhost_data__telnet *vhd = + (struct per_vhost_data__telnet *) + lws_protocol_vh_priv_get(lws_get_vhost(wsi), + lws_get_protocol(wsi)); + const struct lws_protocol_vhost_options *pvo = + (const struct lws_protocol_vhost_options *)in; + int n, m; + uint8_t buf[LWS_PRE + 800], *pu = in; + + switch ((int)reason) { + case LWS_CALLBACK_PROTOCOL_INIT: + vhd = lws_protocol_vh_priv_zalloc(lws_get_vhost(wsi), + lws_get_protocol(wsi), + sizeof(struct per_vhost_data__telnet)); + vhd->context = lws_get_context(wsi); + vhd->protocol = lws_get_protocol(wsi); + vhd->vhost = lws_get_vhost(wsi); + + while (pvo) { + if (!strcmp(pvo->name, "ops")) + vhd->ops = (const struct lws_ssh_ops *)pvo->value; + + pvo = pvo->next; + } + + if (!vhd->ops) { + lwsl_err("telnet pvo \"ops\" is mandatory\n"); + return -1; + } + break; + + case LWS_CALLBACK_RAW_ADOPT: + pss->next = vhd->live_pss_list; + vhd->live_pss_list = pss; + pss->vhd = vhd; + pss->state = LTST_WAIT_IAC; + pss->initial = 0; + if (vhd->ops->channel_create) + vhd->ops->channel_create(wsi, &pss->priv); + lws_callback_on_writable(wsi); + break; + + case LWS_CALLBACK_RAW_CLOSE: + p = &vhd->live_pss_list; + + while (*p) { + if ((*p) == pss) { + if (vhd->ops->channel_destroy) + vhd->ops->channel_destroy(pss->priv); + *p = pss->next; + continue; + } + p = &((*p)->next); + } + break; + + case LWS_CALLBACK_RAW_RX: + n = 0; + + /* this stuff is coming in telnet line discipline, we + * have to strip IACs and process IAC repeats */ + + while (len--) { + if (telnet_ld(pss, *pu)) + buf[n++] = *pu++; + else + pu++; + + if (n > 100 || !len) + pss->vhd->ops->rx(pss->priv, wsi, buf, n); + } + break; + + case LWS_CALLBACK_RAW_WRITEABLE: + n = 0; + if (!pss->initial) { + memcpy(buf + LWS_PRE, init, sizeof(init)); + + n = sizeof(init); + pss->initial = 1; + } else { + /* bring any waiting tx into second half of buffer + * restrict how much we can send to 1/4 of the buffer, + * because we have to apply telnet line discipline... + * in the worst case of all 0xff, doubling the size + */ + pu = buf + LWS_PRE + 400; + m = pss->vhd->ops->tx(pss->priv, LWS_STDOUT, pu, + (sizeof(buf) - LWS_PRE - n - 401) / 2); + + /* + * apply telnet line discipline and copy into place + * in output buffer + */ + while (m--) { + if (*pu == 0xff) + buf[LWS_PRE + n++] = 0xff; + buf[LWS_PRE + n++] = *pu++; + } + } + if (n > 0) { + m = lws_write(wsi, (unsigned char *)buf + LWS_PRE, n, + LWS_WRITE_HTTP); + if (m < 0) { + lwsl_err("ERROR %d writing to di socket\n", m); + return -1; + } + } + + if (vhd->ops->tx_waiting(&pss->priv)) + lws_callback_on_writable(wsi); + break; + + case LWS_CALLBACK_SSH_UART_SET_RXFLOW: + /* + * this is sent to set rxflow state on any connections that + * sink on a particular uart. The uart index affected is in len + * + * More than one protocol may sink to the same uart, and the + * protocol may select the uart itself, eg, in the URL used + * to set up the connection. + */ + lws_rx_flow_control(wsi, len & 1); + break; + + default: + break; + } + + return 0; +} + +const struct lws_protocols protocols_telnet[] = { + { + "lws-telnetd-base", + lws_callback_raw_telnet, + sizeof(struct per_session_data__telnet), + 1024, 0, NULL, 900 + }, + { NULL, NULL, 0, 0, 0, NULL, 0 } /* terminator */ +}; + + diff --git a/test-apps/lws-ssh-test-keys b/test-apps/lws-ssh-test-keys new file mode 100644 index 000000000..2c409b2e9 --- /dev/null +++ b/test-apps/lws-ssh-test-keys @@ -0,0 +1,51 @@ +-----BEGIN RSA PRIVATE KEY----- +MIIJKQIBAAKCAgEAp1oj/nPpEg+i5PgujQPSq7gKWuObG7feP3cU9GwiE5QAP/jw +ZOpkdZcFoF2KMzjHax66sd+KYqg8l53OB2m6gmjpvxa2IZAjy/M2tujzGKrXkqLL +sCr//+Yk+mVoTZ7DMBMQcLVejCKtDMQHlqsUZ2DVqTTPIjerBc5HRv2BXch6yAU4 +MMzO+zSwjJehhJCRK0QhaaQtksGMRmtwUa4FMF9y5FfB6TCGmBxaNUII+0nKph8E +tke+Ujqotmjlg6So85wEYPSYMw1kkIuLHgTFdqC9AU8CQDUg3/qdLEC7GihiYaVa +QUMktsFHsrhssrbqVsxJbkK2ozGaudoqLXKIL+QX3rpX00xWyT+JLhzrEj9JbENp +aTA0ADUhxL18cxySwy1zPYFyc8CfmYkbekfm35j9Z3zdzIlrcXCGwWp1sECusUwi +gXuMD2irWuRFOsLCz3mpDiFc6Hmjrvx7G7T2ZcF9DLv6FBXHysigIZZFNeTDgCBH +1D6PGIedm1jJSJaWWuMVmyzBsNxq7Kzz3XLAGrsqr2OPzY41kG1oT9UrlH77+e9P +TyIjlI1Sith1MJkdaLnIelzEBl3zEdYdVo73Pm5DbNe4AiK0JxYpQGSwt0ptzqYs +/+CzvfR8OOPBtETNr0J9JiROOsBLvwddFOiX+BH6I4YdXZPOQQ9S0yG/jd0CAwEA +AQKCAgAC3XY0SwO4fXAKf308iM44hmQW/kKPjOxPJdjD/n3u29/NOJPVBnZF1RoR +jsho7BXt7Y7AsNULr1mqNtdqJRM+XFF0Jg1kMbWLLlTHeOGAkJw0NHlMQNA1L1l+ +t/G7MnahAhKL+27s80MHLuv6Vl95DZ1a0j6hlVZmOQvbWUe3tVD0z7IQk9EPV+2V +2pq3TEpP9VClIFxvYMToB7raiyInm9q5sg7t0Rjczc91jfXdZ3wCsBFClaPagIqW +5ODZCh6iXQ9uIYHhjd8k4l61WtuOll3mAdZGByLS8tVyBoGthvd4OH59E4szXce+ +dY3W2W7VoZW4P4gk7xp5CBUkxgsyz5yJR4rNKVV9JSDAGpfBGsoCFMwXjeq/u1JQ +RRAViVmB8QYSoVmHf/f+IXYXuVbwzAZMoUf1DHjAG94bxyPi6tAshw79jDxJudnv +L3mFVYrtRD+dXlihdrUX8UOBfnNd3oxA5FXHV8zOwhpZwr8rsfXLXKAtL/XPfiLj +VbK9gAikS3dnVibioTMa8O8qUSRRb4zaqrV5bBgVvmNMNyP+bOXDBAf86sNt/blb +Sf8P/yruWVOQTafhHtDbaEFgaDDZ7JabCiVu6Q2faBAVfnxho9ynL0AalM6fkrAP +D2nWii4DeNKg4+yc9gDk9LlDX9SqLwND6wQYhpXhsH41ZDxvQQKCAQEAz2SoF0rO +FvWAJElMLGtTIzxT8otABP5vWfhBzY+MtFo7iRlmMDEL+2fYYYK3PGzhSyNMwhAW +QBrhqCZJc1DPtqubxeqkpnloHQvQy4YB8GeM6dAerj+/1k3Ox3tg2EaFaPuOOxhy +krgr53K8+O6DFa3OMHVijPRKr0RgzNHJxkLcfaSrjCd27kPp68ndW79rt2hWgyCP +P+97XEjBo7CegHcfOuZKcFtHVD9PyScP7Piv0wtuoCpi3/GyiBaQCpcyK02duQDs +eFK9bLMtZvnKl0L+tLYjvyBjBjd6m3MuQR+4CH2mKB1zpdPftp2/yPjUTue3eGjB +/hfy9ZEB3Qo+NQKCAQEAzpMRMztnvpYcPt3yhGGyqivtPL/2g6rsGwmpaTpWywF5 +1LfscLSpmJ0JYQsHn6Gpqcezsf/VOAUilE5L333ZFAfMOwi49YJ2b8Aok8tbt1+j +fdl6o3weSyMTO/hBfR48Fk9tB1hZgh0u3xlYf+vRH/ilEFOgqhNmRVL19rr8lW1t +8ZpHV/7lfX/2bLgW1g8ng+vS0OMe6ugdoRXVvJzUBccKqpksOTuUmmv7xyAKQoUe +JbtOFRYKAeOo+eIeOxNbyl5kn7+Dh5P1049F+ERbiDSc20Q+8kyJoiVQbYVLJN2A +2Mb7EUt/xolzQLnVjvTtE4LsN688g122+HfrLXmmCQKCAQBhqqZaKbk6KK0K6ZW8 +yWIiktN5wkgI0gWAWiAq/PInMOMeol50TXS2FWZaLWO7Sg8jAmGwdkD0OXSRak5m +xuS6wsAeCW02lLAKFbljTx10qF888Oyx5IWkF4pMePbXgwZqtSR7Af1ayO6sFWWW +2UPUHsCeI3mgpZ7SQSJQ8m7SNkR9yuGapC8m78amaq8a+N9yROmQ4PF1C4ONpxnB +y3gpSW/knfTqSqIhs5sQQJwIXej3O0gCl1Nu4PTRj8aPpjpTGD8xk5TI6TYZjZvR +Bct5RmyKj8fvxwG7OL89m5Vpx9Uz8nAgLhZ7Pnb5GfrqWvwomIjXZIYO8hpRuNMm +1B8NAoIBAQCKqGDFOLy8StoOwL/GaCWa3/1P57I6UwJEa8nRHh2gCg+S3xnP1RR5 +of7nqpWlasgNdESD2CtwfNHnJl77Vufc8BcAESzFbpq9DAiwm7GmdoWxNceB8RAM +czC38j1TFHZUq1+NrJn4IkqR6dtjkhA/G5EAUoHnZzogkj0TLhPY4SkJIPt+b1Pv +V3M7Kp35dRabEDHjkG/yUXeB5rwe7E3Myvu34zSx/fITbSQFVtZMLDo+LWmN8csp +1XxYrpSIJshYH9/+8ngBCynYpbTbnlaqKFaZP0fZL9K6ib1gpjX4Os3/tCBWTY0o +4J4B9jsIyBJSJHEWN4Ow0bi9MxEi5yKxAoIBAQCJOAIDUxI/6FgXzpl3HBfbsRZS +g0vI9pXRT5mAKx+ovVubXO7sJL1GlG9H4nKcVWTThzqyeskosBMF0RkKB7VAj2Ur +pYFcVsrtM6U4wiSpiHXyPGSK6jevCJQZEQ8MKSg69HRTPFFXc39afXq1xqJVamtp +5QjLttBeoidnzuKpNUdIqJzmehevipofB/lvXZ/e8CzNNh2ryW0gwFo8b+StuMou +cIaynvwaVdMm5/4LsAwE08liLshMIxng6FNnxEMzZ6fiSFT1jq1qv54agqWfFEOJ +57g8A/HpVKmSQXFyq1QEdKlA2vttuavq3iIW2OpUnxAnk8ZPo9oRoR8YQ7PH +-----END RSA PRIVATE KEY----- diff --git a/test-apps/lws-ssh-test-keys.pub b/test-apps/lws-ssh-test-keys.pub new file mode 100644 index 000000000..ea854fe8c --- /dev/null +++ b/test-apps/lws-ssh-test-keys.pub @@ -0,0 +1 @@ +ssh-rsa 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 agreen@build diff --git a/test-apps/test-sshd.c b/test-apps/test-sshd.c new file mode 100644 index 000000000..a881f2844 --- /dev/null +++ b/test-apps/test-sshd.c @@ -0,0 +1,701 @@ +/* + * Example embedded sshd server using libwebsockets sshd plugin + * + * Copyright (C) 2017 Andy Green + * + * This file is made available under the Creative Commons CC0 1.0 + * Universal Public Domain Dedication. + * + * The person who associated a work with this deed has dedicated + * the work to the public domain by waiving all of his or her rights + * to the work worldwide under copyright law, including all related + * and neighboring rights, to the extent allowed by law. You can copy, + * modify, distribute and perform the work, even for commercial purposes, + * all without asking permission. + * + * The test apps are intended to be adapted for use in your code, which + * may be proprietary. So unlike the library itself, they are licensed + * Public Domain. + * + * + * This test app listens on port 2200 for authorized ssh connections. Run it + * using + * + * $ sudo libwebsockets-test-sshd + * + * Connect to it using the test private key with: + * + * $ ssh -p 2200 -i /usr/local/share/libwebsockets-test-server/lws-ssh-test-keys anyuser@127.0.0.1 + */ + +#include +#include +#include +#include +#include + +/* import the whole of lws-plugin-sshd-base statically */ +#include + +/* + * We store the test server's own key here (will be created with a new + * random key if it doesn't exist + * + * The /etc path is the only reason we have to run as root. + */ +#define TEST_SERVER_KEY_PATH "/etc/lws-test-sshd-server-key" + +/* + * This is a copy of the lws ssh test public key, you can find it in + * /usr[/local]/share/libwebsockets-test-server/lws-ssh-test-keys.pub + * and the matching private key there too in .../lws-ssh-test-keys + * + * These keys are distributed for testing! Don't use them on a real system + * unless you want anyone with a copy of lws to access it. + */ +static const char *authorized_key = + "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAACAQCnWiP+c+kSD6Lk+C6NA9KruApa45sbt" + "94/dxT0bCITlAA/+PBk6mR1lwWgXYozOMdrHrqx34piqDyXnc4HabqCaOm/FrYhkCPL8z" + "a26PMYqteSosuwKv//5iT6ZWhNnsMwExBwtV6MIq0MxAeWqxRnYNWpNM8iN6sFzkdG/YF" + "dyHrIBTgwzM77NLCMl6GEkJErRCFppC2SwYxGa3BRrgUwX3LkV8HpMIaYHFo1Qgj7Scqm" + "HwS2R75SOqi2aOWDpKjznARg9JgzDWSQi4seBMV2oL0BTwJANSDf+p0sQLsaKGJhpVpBQ" + "yS2wUeyuGyytupWzEluQrajMZq52iotcogv5BfeulfTTFbJP4kuHOsSP0lsQ2lpMDQANS" + "HEvXxzHJLDLXM9gXJzwJ+ZiRt6R+bfmP1nfN3MiWtxcIbBanWwQK6xTCKBe4wPaKta5EU" + "6wsLPeakOIVzoeaOu/HsbtPZlwX0Mu/oUFcfKyKAhlkU15MOAIEfUPo8Yh52bWMlIlpZa" + "4xWbLMGw3GrsrPPdcsAauyqvY4/NjjWQbWhP1SuUfvv5709PIiOUjVKK2HUwmR1ouch6X" + "MQGXfMR1h1Wjvc+bkNs17gCIrQnFilAZLC3Sm3Opiz/4LO99Hw448G0RM2vQn0mJE46w" + "Eu/B10U6Jf4Efojhh1dk85BD1LTIb+N3Q== ssh-test-key@lws"; + +static struct lws_context *context = NULL; +static volatile char force_exit = 0; + +/* + * These are our "ops" that form our customization of, and interface to, the + * generic sshd plugin. + * + * The priv struct contains our data we want to associate to each channel + * individually. + */ + +struct sshd_instance_priv { + struct lws_protocol_vhost_options *env; + struct lws_ring *ring_stdout; + struct lws_ring *ring_stderr; + + struct lws *wsi_stdout; + struct lws *wsi_stderr; + + uint32_t pty_in_bloat_nl_to_crnl:1; + uint32_t pty_in_echo:1; + uint32_t pty_in_cr_to_nl:1; + + uint32_t insert_lf:1; +}; + + +/* ops: channel lifecycle */ + +static int +ssh_ops_channel_create(struct lws *wsi, void **_priv) +{ + struct sshd_instance_priv *priv; + + priv = malloc(sizeof(struct sshd_instance_priv)); + *_priv = priv; + if (!priv) + return 1; + + memset(priv, 0, sizeof(*priv)); + + priv->ring_stdout = lws_ring_create(1, 1024, NULL); + if (!priv->ring_stdout) { + free(priv); + + return 1; + } + + priv->ring_stderr = lws_ring_create(1, 1024, NULL); + if (!priv->ring_stderr) { + lws_ring_destroy(priv->ring_stdout); + free(priv); + + return 1; + } + + return 0; +} + +static int +ssh_ops_channel_destroy(void *_priv) +{ + struct sshd_instance_priv *priv = _priv; + const struct lws_protocol_vhost_options *pvo = priv->env, *pvo1; + + while (pvo) { + pvo1 = pvo; + free((char *)pvo->name); + free((char *)pvo->value); + pvo = pvo->next; + free((void *)pvo1); + } + priv->env = NULL; + + lws_ring_destroy(priv->ring_stdout); + lws_ring_destroy(priv->ring_stderr); + free(priv); + + return 0; +} + +/* ops: IO */ + +static int +ssh_ops_tx_waiting(void *_priv) +{ + struct sshd_instance_priv *priv = _priv; + int s = 0; + + if (lws_ring_get_count_waiting_elements(priv->ring_stdout, NULL)) + s |= LWS_STDOUT; + if (lws_ring_get_count_waiting_elements(priv->ring_stderr, NULL)) + s |= LWS_STDERR; + + return s; +} + +static size_t +ssh_ops_tx(void *_priv, int stdch, uint8_t *buf, size_t len) +{ + struct sshd_instance_priv *priv = _priv; + struct lws_ring *r; + struct lws *wsi; + size_t n; + + if (stdch == LWS_STDOUT) { + r = priv->ring_stdout; + wsi = priv->wsi_stdout; + } else { + r = priv->ring_stderr; + wsi = priv->wsi_stderr; + } + + n = lws_ring_consume(r, NULL, buf, len); + + if (n) + lws_rx_flow_control(wsi, 1); + + return n; +} + + +static int +ssh_ops_rx(void *_priv, struct lws *wsi, const uint8_t *buf, uint32_t len) +{ + struct sshd_instance_priv *priv = _priv; + struct lws *wsi_stdin = lws_cgi_get_stdwsi(wsi, LWS_STDIN); + int fd; + uint8_t bbuf[256]; + + if (!wsi_stdin) + return -1; + + fd = lws_get_socket_fd(wsi_stdin); + + if (*buf != 0x0d) { + if (write(fd, buf, len) != len) + return -1; + if (priv->pty_in_echo) { + lws_ring_insert(priv->ring_stdout, buf, 1); + lws_callback_on_writable(wsi); + } + } else { + bbuf[0] = 0x0a; + bbuf[1] = 0x0a; + if (write(fd, bbuf, 1) != 1) + return -1; + + if (priv->pty_in_echo) { + bbuf[0] = 0x0d; + bbuf[1] = 0x0a; + lws_ring_insert(priv->ring_stdout, bbuf, 2); + lws_callback_on_writable(wsi); + } + } + + return 0; +} + +/* ops: storage for the (autogenerated) persistent server key */ + +static size_t +ssh_ops_get_server_key(struct lws *wsi, uint8_t *buf, size_t len) +{ + int fd = open(TEST_SERVER_KEY_PATH, O_RDONLY), n; + + if (fd == -1) { + lwsl_err("%s: unable to open %s for read: %s\n", __func__, + TEST_SERVER_KEY_PATH, strerror(errno)); + + return 0; + } + + n = read(fd, buf, len); + if (n < 0) { + lwsl_err("%s: read failed: %d\n", __func__, n); + n = 0; + } + + close(fd); + + return n; +} + +static size_t +ssh_ops_set_server_key(struct lws *wsi, uint8_t *buf, size_t len) +{ + int fd = open(TEST_SERVER_KEY_PATH, O_CREAT | O_TRUNC | O_RDWR, 0600); + int n; + + lwsl_notice("%s: %d\n", __func__, fd); + if (fd == -1) { + lwsl_err("%s: unable to open %s for write: %s\n", __func__, + TEST_SERVER_KEY_PATH, strerror(errno)); + + return 0; + } + + n = write(fd, buf, len); + if (n < 0) { + lwsl_err("%s: read failed: %d\n", __func__, errno); + n = 0; + } + + close(fd); + + return n; +} + +/* ops: auth */ + +static int +ssh_ops_is_pubkey_authorized(const char *username, const char *type, + const uint8_t *peer, int peer_len) +{ + char *aps = NULL, *p, *ps; + int n = strlen(type), alen = 2048, ret = 2, len; + size_t s = 0; + + lwsl_info("%s: checking pubkey for %s\n", __func__, username); + + s = strlen(authorized_key) + 1; + + aps = malloc(s); + if (!aps) { + lwsl_notice("OOM 1\n"); + goto bail_p1; + } + memcpy(aps, authorized_key, s); + + /* this is all we understand at the moment */ + if (strcmp(type, "ssh-rsa")) { + lwsl_notice("type is not ssh-rsa\n"); + goto bail_p1; + } + p = aps; + + if (strncmp(p, type, n)) { + lwsl_notice("lead-in string does not match %s\n", type); + goto bail_p1; + } + + p += n; + if (*p != ' ') { + lwsl_notice("missing space at end of lead-in\n"); + goto bail_p1; + } + + + p++; + ps = malloc(alen); + if (!ps) { + lwsl_notice("OOM 2\n"); + free(aps); + goto bail; + } + len = lws_b64_decode_string(p, ps, alen); + free(aps); + if (len < 0) { + lwsl_notice("key too big\n"); + goto bail; + } + + if (peer_len > len) { + lwsl_notice("peer_len %d bigger than decoded len %d\n", + peer_len, len); + goto bail; + } + + /* + * once we are past that, it's the same name + * EN that the peer sends us + */ + + if (memcmp(peer, ps, peer_len)) { + lwsl_notice("factors mismatch\n"); + goto bail; + } + + lwsl_info("pubkey authorized\n"); + + ret = 0; +bail: + free(ps); + + return ret; + +bail_p1: + if (aps) + free(aps); + + return 1; +} + +/* ops: spawn subprocess */ + +static int +ssh_cgi_env_add(struct sshd_instance_priv *priv, const char *name, + const char *value) +{ + struct lws_protocol_vhost_options *pvo = malloc(sizeof(*pvo)); + + if (!pvo) + return 1; + + pvo->name = malloc(strlen(name) + 1); + if (!pvo->name) { + free(pvo); + return 1; + } + + pvo->value = malloc(strlen(name) + 1); + if (!pvo->value) { + free((char *)pvo->name); + free(pvo); + return 1; + } + + strcpy((char *)pvo->name, name); + strcpy((char *)pvo->value, value); + + pvo->next = priv->env; + priv->env = pvo; + + lwsl_notice("%s: ENV %s <- %s\n", __func__, name, value); + + return 0; +} + +static int +ssh_ops_set_env(void *_priv, const char *name, const char *value) +{ + struct sshd_instance_priv *priv = _priv; + + return ssh_cgi_env_add(priv, name, value); +} + + +static int +ssh_ops_pty_req(void *_priv, struct lws_ssh_pty *pty) +{ + struct sshd_instance_priv *priv = _priv; + uint8_t *p = (uint8_t *)pty->modes, opc; + uint32_t arg; + + lwsl_notice("%s: pty term %s, modes_len %d\n", __func__, pty->term, + pty->modes_len); + + ssh_cgi_env_add(priv, "TERM", pty->term); + + while (p < (uint8_t *)pty->modes + pty->modes_len) { + if (*p >= 160) + break; + if (!*p) + break; + opc = *p++; + + arg = *p++ << 24; + arg |= *p++ << 16; + arg |= *p++ << 8; + arg |= *p++; + + lwsl_debug("pty opc %d: 0x%x\n", opc, arg); + + switch (opc) { + case SSHMO_ICRNL: + priv->pty_in_cr_to_nl = !!arg; + lwsl_notice(" SSHMO_ICRNL: %d\n", !!arg); + break; + case SSHMO_ONLCR: + priv->pty_in_bloat_nl_to_crnl = !!arg; + lwsl_notice(" SSHMO_ONLCR: %d\n", !!arg); + break; + case SSHMO_ECHO: +// priv->pty_in_echo = !!arg; + lwsl_notice(" SSHMO_ECHO: %d\n", !!arg); + break; + } + } + + return 0; +} + +static int +ssh_ops_child_process_io(void *_priv, struct lws *wsi, + struct lws_cgi_args *args) +{ + struct sshd_instance_priv *priv = _priv; + struct lws_ring *r = priv->ring_stdout; + void *rp; + uint8_t buf[256], *p, *d; + size_t bytes; + int n, m; + + priv->wsi_stdout = args->stdwsi[LWS_STDOUT]; + priv->wsi_stderr = args->stdwsi[LWS_STDERR]; + + switch (args->ch) { + case LWS_STDIN: + lwsl_notice("STDIN\n"); + break; + + case LWS_STDERR: + r = priv->ring_stderr; + /* fallthru */ + case LWS_STDOUT: + if (lws_ring_next_linear_insert_range(r, &rp, &bytes) || + bytes < 1) { + lwsl_notice("bytes %d\n", (int)bytes); + /* no room in the fifo */ + break; + } + if (priv->pty_in_bloat_nl_to_crnl) { + if (bytes != 1) + n = bytes / 2; + else + n = 1; + if (n > sizeof(buf)) + n = sizeof(buf); + + if (!n) + break; + + m = lws_get_socket_fd(args->stdwsi[args->ch]); + if (m < 0) + return -1; + n = read(m, buf, n); + if (n < 0) + return -1; + if (n == 0) { + lwsl_notice("zero length stdin %d\n", n); + break; + } + m = 0; + p = rp; + d = buf; + while (m++ < n) { + if (priv->insert_lf) { + priv->insert_lf = 0; + *p++ = 0x0d; + } + if (*d == 0x0a) + priv->insert_lf = 1; + + *p++ = *d++; + } + n = (void *)p - rp; + if (n < bytes && priv->insert_lf) { + priv->insert_lf = 0; + *p++ = 0x0d; + n++; + } + } else { + n = lws_get_socket_fd(args->stdwsi[args->ch]); + if (n < 0) + return -1; + n = read(n, rp, bytes); + if (n < 0) + return -1; + } + + lws_rx_flow_control(args->stdwsi[args->ch], 0); + + lws_ring_bump_head(r, n); + lws_callback_on_writable(wsi); + break; + } + + return 0; +} + +static int +ssh_ops_child_process_terminated(void *priv, struct lws *wsi) +{ + lwsl_notice("%s\n", __func__); + return -1; +} + +static int +ssh_ops_exec(void *_priv, struct lws *wsi, const char *command) +{ + lwsl_notice("%s: EXEC %s\n", __func__, command); + + /* we don't want to exec anything */ + return 1; +} + +static int +ssh_ops_shell(void *_priv, struct lws *wsi) +{ + struct sshd_instance_priv *priv = _priv; + const char *cmd[] = { + "/bin/bash", + "-i", + "-l", + NULL + }; + lwsl_notice("%s: SHELL\n", __func__); + + if (lws_cgi(wsi, cmd, -1, 0, priv->env)) { + lwsl_notice("shell spawn failed\n"); + return -1; + } + + return 0; +} + +/* ops: banner */ + +static size_t +ssh_ops_banner(char *buf, size_t max_len, char *lang, size_t max_lang_len) +{ + int n = snprintf(buf, max_len, "\n" + " |\\---/| lws-ssh Test Server\n" + " | o_o | SSH Terminal Server\n" + " \\_^_/ Copyright (C) 2017 Crash Barrier Ltd\n\n"); + + snprintf(lang, max_lang_len, "en/US"); + + return n; +} + +static void +ssh_ops_disconnect_reason(uint32_t reason, const char *desc, + const char *desc_lang) +{ + lwsl_notice("DISCONNECT reason 0x%X, %s (lang %s)\n", reason, desc, + desc_lang); +} + +static const struct lws_ssh_ops ssh_ops = { + .channel_create = ssh_ops_channel_create, + .channel_destroy = ssh_ops_channel_destroy, + .tx_waiting = ssh_ops_tx_waiting, + .tx = ssh_ops_tx, + .rx = ssh_ops_rx, + .get_server_key = ssh_ops_get_server_key, + .set_server_key = ssh_ops_set_server_key, + .set_env = ssh_ops_set_env, + .pty_req = ssh_ops_pty_req, + .child_process_io = ssh_ops_child_process_io, + .child_process_terminated = ssh_ops_child_process_terminated, + .exec = ssh_ops_exec, + .shell = ssh_ops_shell, + .is_pubkey_authorized = ssh_ops_is_pubkey_authorized, + .banner = ssh_ops_banner, + .disconnect_reason = ssh_ops_disconnect_reason, + .server_string = "SSH-2.0-Libwebsockets", + .api_version = 1, +}; + +/* + * use per-vhost options to bind the ops struct to the instance of the + * "lws_raw_sshd" protocol instantiated on our vhost + */ + +static const struct lws_protocol_vhost_options pvo_ssh_ops = { + NULL, + NULL, + "ops", + (void *)&ssh_ops +}; + +static const struct lws_protocol_vhost_options pvo_ssh = { + NULL, + &pvo_ssh_ops, + "lws-ssh-base", + "" /* ignored, just matches the protocol name above */ +}; + +void sighandler(int sig) +{ + force_exit = 1; + lws_cancel_service(context); +} + +int main() +{ + static struct lws_context_creation_info info; + struct lws_vhost *vh_sshd; + int ret = 1, n; + + /* info is on the stack, it must be cleared down before use */ + memset(&info, 0, sizeof(info)); + + signal(SIGINT, sighandler); + lws_set_log_level(LLL_ERR | LLL_WARN | LLL_NOTICE + /*| LLL_INFO */ + /* | LLL_DEBUG */, NULL); + + lwsl_notice("lws test-sshd -- Copyright (C) 2017 \n"); + + /* create the lws context */ + + info.options = LWS_SERVER_OPTION_EXPLICIT_VHOSTS | + LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT; + + context = lws_create_context(&info); + if (!context) { + lwsl_err("Failed to create context\n"); + return 1; + } + + /* create our listening vhost */ + + info.port = 2200; + info.options = LWS_SERVER_OPTION_ONLY_RAW; + info.vhost_name = "sshd"; + info.protocols = protocols_sshd; + info.pvo = &pvo_ssh; + + vh_sshd = lws_create_vhost(context, &info); + if (!vh_sshd) { + lwsl_err("Failed to create sshd vhost\n"); + goto bail; + } + + /* spin doing service */ + + n = 0; + while (!n && !force_exit) + n = lws_service(context, 500); + + ret = 0; + + /* cleanup */ + +bail: + lws_context_destroy(context); + lwsl_notice("exiting...\n"); + + return ret; +}