libwebsockets/minimal-examples/secure-streams/minimal-secure-streams-metadata/minimal-secure-streams.c

/*
 * lws-minimal-secure-streams-metadata
 *
 * Written in 2010-2020 by Andy Green <andy@warmcat.com>
 *
 * This file is made available under the Creative Commons CC0 1.0
 * Universal Public Domain Dedication.
 *
 *
 * This demonstrates a minimal http client using secure streams api.
 *
 * It visits https://warmcat.com/ and receives the html page there.
 *
 * This example is built two different ways from the same source... one includes
 * the policy everything needed to fulfil the stream directly.  The other -client
 * variant has no policy itself and some other minor init changes, and connects
 * to the -proxy example to actually get the connection done.
 *
 * In the -client build case, the example does not even init the tls libraries
 * since the proxy part will take care of all that.
 */

#include <libwebsockets.h>
#include <string.h>
#include <signal.h>

/*
 * uncomment to force network traffic through 127.0.0.1:1080
 *
 * On your local machine, you can run a SOCKS5 proxy like this
 *
 * $ ssh -N -D 0.0.0.0:1080 localhost -v
 *
 * If enabled, this also fetches a remote policy that also
 * specifies that all traffic should go through the remote
 * proxy.
 */
// #define VIA_LOCALHOST_SOCKS

static int interrupted, bad = 1, force_cpd_fail_portal,
	   force_cpd_fail_no_internet;
static lws_state_notify_link_t nl;
static const char *server_name_or_url = "warmcat.com";

/*
 * If the -proxy app is fulfilling our connection, then we don't need to have
 * the policy in the client.
 *
 * When we build with LWS_SS_USE_SSPC, the apis hook up to a proxy process over
 * a Unix Domain Socket.  To test that, you need to separately run the
 * ./lws-minimal-secure-streams-proxy test app on the same machine.
 */

#if !defined(LWS_SS_USE_SSPC)
static const char * const default_ss_policy =
	"{"
	  "\"release\":"			"\"01234567\","
	  "\"product\":"			"\"myproduct\","
	  "\"schema-version\":"			"1,"
#if defined(VIA_LOCALHOST_SOCKS)
	  "\"via-socks5\":"                     "\"127.0.0.1:1080\","
#endif

	  "\"retry\": ["	/* named backoff / retry strategies */
		"{\"default\": {"
			"\"backoff\": ["	 "1000,"
						 "2000,"
						 "3000,"
						 "5000,"
						"10000"
				"],"
			"\"conceal\":"		"5,"
			"\"jitterpc\":"		"20,"
			"\"svalidping\":"	"30,"
			"\"svalidhup\":"	"35"
		"}}"
	  "],"
	  "\"certs\": [" /* named individual certificates in BASE64 DER */
		/*
		 * Let's Encrypt certs for warmcat.com / libwebsockets.org
		 *
		 * We fetch the real policy from there using SS and switch to
		 * using that.
		 */
		"{\"dst_root_x3\": \""
	"MIIDSjCCAjKgAwIBAgIQRK+wgNajJ7qJMDmGLvhAazANBgkqhkiG9w0BAQUFADA/"
	"MSQwIgYDVQQKExtEaWdpdGFsIFNpZ25hdHVyZSBUcnVzdCBDby4xFzAVBgNVBAMT"
	"DkRTVCBSb290IENBIFgzMB4XDTAwMDkzMDIxMTIxOVoXDTIxMDkzMDE0MDExNVow"
	"PzEkMCIGA1UEChMbRGlnaXRhbCBTaWduYXR1cmUgVHJ1c3QgQ28uMRcwFQYDVQQD"
	"Ew5EU1QgUm9vdCBDQSBYMzCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEB"
	"AN+v6ZdQCINXtMxiZfaQguzH0yxrMMpb7NnDfcdAwRgUi+DoM3ZJKuM/IUmTrE4O"
	"rz5Iy2Xu/NMhD2XSKtkyj4zl93ewEnu1lcCJo6m67XMuegwGMoOifooUMM0RoOEq"
	"OLl5CjH9UL2AZd+3UWODyOKIYepLYYHsUmu5ouJLGiifSKOeDNoJjj4XLh7dIN9b"
	"xiqKqy69cK3FCxolkHRyxXtqqzTWMIn/5WgTe1QLyNau7Fqckh49ZLOMxt+/yUFw"
	"7BZy1SbsOFU5Q9D8/RhcQPGX69Wam40dutolucbY38EVAjqr2m7xPi71XAicPNaD"
	"aeQQmxkqtilX4+U9m5/wAl0CAwEAAaNCMEAwDwYDVR0TAQH/BAUwAwEB/zAOBgNV"
	"HQ8BAf8EBAMCAQYwHQYDVR0OBBYEFMSnsaR7LHH62+FLkHX/xBVghYkQMA0GCSqG"
	"SIb3DQEBBQUAA4IBAQCjGiybFwBcqR7uKGY3Or+Dxz9LwwmglSBd49lZRNI+DT69"
	"ikugdB/OEIKcdBodfpga3csTS7MgROSR6cz8faXbauX+5v3gTt23ADq1cEmv8uXr"
	"AvHRAosZy5Q6XkjEGB5YGV8eAlrwDPGxrancWYaLbumR9YbK+rlmM6pZW87ipxZz"
	"R8srzJmwN0jP41ZL9c8PDHIyh8bwRLtTcm1D9SZImlJnt1ir/md2cXjbDaJWFBM5"
	"JDGFoqgCWjBH4d1QB7wCCZAA62RjYJsWvIjJEubSfZGL+T0yjWW06XyxV3bqxbYo"
	"Ob8VZRzI9neWagqNdwvYkQsEjgfbKbYK7p2CNTUQ"
		"\"}"
	  "],"
	  "\"trust_stores\": [" /* named cert chains */
		"{"
			"\"name\": \"le_via_dst\","
			"\"stack\": ["
				"\"dst_root_x3\""
			"]"
		"}"
	  "],"
	  "\"s\": ["
		"{\"mintest\": {"
			"\"endpoint\":"		"\"${servername}\","
			"\"port\":"		"443,"
			"\"protocol\":"		"\"h1\","
			"\"http_method\":"	"\"GET\","
			"\"http_url\":"		"\"\","
			"\"tls\":"		"true,"
			"\"opportunistic\":"	"true,"
			"\"retry\":"		"\"default\","
			"\"tls_trust_store\":"	"\"le_via_dst\","
			"\"metadata\": ["
				"{\"servername\": \"\"}"
			"]"
		"}}"
	"]}"
;

#endif

typedef struct myss {
	struct lws_ss_handle 		*ss;
	void				*opaque_data;
	/* ... application specific state ... */
	lws_sorted_usec_list_t		sul;
} myss_t;

/* secure streams payload interface */

static lws_ss_state_return_t
myss_rx(void *userobj, const uint8_t *buf, size_t len, int flags)
{
//	myss_t *m = (myss_t *)userobj;

	lwsl_user("%s: len %d, flags: %d\n", __func__, (int)len, flags);
	lwsl_hexdump_info(buf, len);

	/*
	 * If we received the whole message, for our example it means
	 * we are done.
	 */
	if (flags & LWSSS_FLAG_EOM) {
		bad = 0;
		interrupted = 1;
	}

	return 0;
}

static lws_ss_state_return_t
myss_tx(void *userobj, lws_ss_tx_ordinal_t ord, uint8_t *buf, size_t *len,
	int *flags)
{
	//myss_t *m = (myss_t *)userobj;

	return 0;
}

static lws_ss_state_return_t
myss_state(void *userobj, void *sh, lws_ss_constate_t state,
	   lws_ss_tx_ordinal_t ack)
{
	myss_t *m = (myss_t *)userobj;

	lwsl_user("%s: %s, ord 0x%x\n", __func__, lws_ss_state_name((int)state),
		  (unsigned int)ack);

	switch (state) {
	case LWSSSCS_CREATING:
		lwsl_notice("%s: CREATING: setting servername metadata to %s\n",
				__func__, server_name_or_url);
		if (lws_ss_set_metadata(m->ss, "servername", server_name_or_url,
					strlen(server_name_or_url)))
			return LWSSSSRET_DISCONNECT_ME;
		return lws_ss_client_connect(m->ss);

	case LWSSSCS_ALL_RETRIES_FAILED:
		/* if we're out of retries, we want to close the app and FAIL */
		interrupted = 1;
		break;
	case LWSSSCS_QOS_ACK_REMOTE:
		lwsl_notice("%s: LWSSSCS_QOS_ACK_REMOTE\n", __func__);
		break;
	default:
		break;
	}

	return 0;
}

static int
app_system_state_nf(lws_state_manager_t *mgr, lws_state_notify_link_t *link,
		    int current, int target)
{
	struct lws_context *context = lws_system_context_from_system_mgr(mgr);

	/*
	 * For the things we care about, let's notice if we are trying to get
	 * past them when we haven't solved them yet, and make the system
	 * state wait while we trigger the dependent action.
	 */
	switch (target) {

	case LWS_SYSTATE_OPERATIONAL:
		if (current == LWS_SYSTATE_OPERATIONAL) {
			lws_ss_info_t ssi;

			/* We're making an outgoing secure stream ourselves */

			memset(&ssi, 0, sizeof(ssi));
			ssi.handle_offset = offsetof(myss_t, ss);
			ssi.opaque_user_data_offset = offsetof(myss_t,
							       opaque_data);
			ssi.rx = myss_rx;
			ssi.tx = myss_tx;
			ssi.state = myss_state;
			ssi.user_alloc = sizeof(myss_t);
			ssi.streamtype = "mintest";

			if (lws_ss_create(context, 0, &ssi, NULL, NULL,
					  NULL, NULL)) {
				lwsl_err("%s: failed to create secure stream\n",
					 __func__);
				return -1;
			}
		}
		break;
	}

	return 0;
}

static lws_state_notify_link_t * const app_notifier_list[] = {
	&nl, NULL
};

static void
sigint_handler(int sig)
{
	interrupted = 1;
}

int main(int argc, const char **argv)
{
	struct lws_context_creation_info info;
	struct lws_context *context;
	const char *p;
	int n = 0;

	signal(SIGINT, sigint_handler);

	memset(&info, 0, sizeof info);
	lws_cmdline_option_handle_builtin(argc, argv, &info);

	lwsl_user("LWS secure streams test client [-d<verb>]\n");

	/* these options are mutually exclusive if given */

	if (lws_cmdline_option(argc, argv, "--force-portal"))
		force_cpd_fail_portal = 1;

	if (lws_cmdline_option(argc, argv, "--force-no-internet"))
		force_cpd_fail_no_internet = 1;

	info.fd_limit_per_thread = 1 + 6 + 1;
	info.port = CONTEXT_PORT_NO_LISTEN;

#if defined(LWS_SS_USE_SSPC)
	info.protocols = lws_sspc_protocols;

	/* connect to ssproxy via UDS by default, else via
	 * tcp connection to this port */
	if ((p = lws_cmdline_option(argc, argv, "-p")))
		info.ss_proxy_port = (uint16_t)atoi(p);

	/* UDS "proxy.ss.lws" in abstract namespace, else this socket
	 * path; when -p given this can specify the network interface
	 * to bind to */
	if ((p = lws_cmdline_option(argc, argv, "-i")))
		info.ss_proxy_bind = p;

	/* if -p given, -a specifies the proxy address to connect to */
	if ((p = lws_cmdline_option(argc, argv, "-a")))
		info.ss_proxy_address = p;
#else
	info.pss_policies_json = default_ss_policy;
	info.options = LWS_SERVER_OPTION_EXPLICIT_VHOSTS |
		       LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT;
#endif

	if ((p = lws_cmdline_option(argc, argv, "-u")))
		server_name_or_url = p;

	/* integrate us with lws system state management when context created */

	nl.name = "app";
	nl.notify_cb = app_system_state_nf;
	info.register_notifier_list = app_notifier_list;

	/* create the context */

	context = lws_create_context(&info);
	if (!context) {
		lwsl_err("lws init failed\n");
		return 1;
	}


	/* the event loop */

	while (n >= 0 && !interrupted)
		n = lws_service(context, 0);

	lws_context_destroy(context);

	lwsl_user("Completed: %s\n", bad ? "failed" : "OK");

	return bad;
}