introduce-new-04-handshake.patch
Signed-off-by: Andy Green <andy@warmcat.com>
This commit is contained in:
Andy Green
parent
d1b11e3d6c
commit
e252217633
4 changed files with 338 additions and 149 deletions
475
lib/handshake.c
475
lib/handshake.c
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@ -70,6 +70,309 @@ interpret_key(const char *key, unsigned long *result)
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return 0;
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}
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static int
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handshake_76(struct libwebsocket *wsi)
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{
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unsigned long key1, key2;
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unsigned char sum[16];
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char *response;
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char *p;
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int n;
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/* Websocket 76? - confirm we have all the necessary pieces */
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if (!wsi->utf8_token[WSI_TOKEN_ORIGIN].token_len ||
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!wsi->utf8_token[WSI_TOKEN_HOST].token_len ||
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!wsi->utf8_token[WSI_TOKEN_CHALLENGE].token_len ||
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!wsi->utf8_token[WSI_TOKEN_KEY1].token_len ||
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!wsi->utf8_token[WSI_TOKEN_KEY2].token_len)
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/* completed header processing, but missing some bits */
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goto bail;
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/* allocate the per-connection user memory (if any) */
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if (wsi->protocol->per_session_data_size) {
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wsi->user_space = malloc(
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wsi->protocol->per_session_data_size);
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if (wsi->user_space == NULL) {
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fprintf(stderr, "Out of memory for "
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"conn user space\n");
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goto bail;
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}
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} else
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wsi->user_space = NULL;
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/* create the response packet */
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/* make a buffer big enough for everything */
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response = malloc(256 +
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wsi->utf8_token[WSI_TOKEN_UPGRADE].token_len +
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wsi->utf8_token[WSI_TOKEN_CONNECTION].token_len +
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wsi->utf8_token[WSI_TOKEN_HOST].token_len +
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wsi->utf8_token[WSI_TOKEN_ORIGIN].token_len +
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wsi->utf8_token[WSI_TOKEN_GET_URI].token_len +
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wsi->utf8_token[WSI_TOKEN_PROTOCOL].token_len);
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if (!response) {
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fprintf(stderr, "Out of memory for response buffer\n");
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goto bail;
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}
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p = response;
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strcpy(p, "HTTP/1.1 101 WebSocket Protocol Handshake\x0d\x0a"
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"Upgrade: WebSocket\x0d\x0a");
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p += strlen("HTTP/1.1 101 WebSocket Protocol Handshake\x0d\x0a"
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"Upgrade: WebSocket\x0d\x0a");
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strcpy(p, "Connection: Upgrade\x0d\x0a"
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"Sec-WebSocket-Origin: ");
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p += strlen("Connection: Upgrade\x0d\x0a"
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"Sec-WebSocket-Origin: ");
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strcpy(p, wsi->utf8_token[WSI_TOKEN_ORIGIN].token);
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p += wsi->utf8_token[WSI_TOKEN_ORIGIN].token_len;
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#ifdef LWS_OPENSSL_SUPPORT
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if (use_ssl) {
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strcpy(p, "\x0d\x0aSec-WebSocket-Location: wss://");
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p += strlen("\x0d\x0aSec-WebSocket-Location: wss://");
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} else {
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#endif
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strcpy(p, "\x0d\x0aSec-WebSocket-Location: ws://");
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p += strlen("\x0d\x0aSec-WebSocket-Location: ws://");
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#ifdef LWS_OPENSSL_SUPPORT
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}
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#endif
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strcpy(p, wsi->utf8_token[WSI_TOKEN_HOST].token);
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p += wsi->utf8_token[WSI_TOKEN_HOST].token_len;
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strcpy(p, wsi->utf8_token[WSI_TOKEN_GET_URI].token);
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p += wsi->utf8_token[WSI_TOKEN_GET_URI].token_len;
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if (wsi->utf8_token[WSI_TOKEN_PROTOCOL].token) {
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strcpy(p, "\x0d\x0aSec-WebSocket-Protocol: ");
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p += strlen("\x0d\x0aSec-WebSocket-Protocol: ");
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strcpy(p, wsi->utf8_token[WSI_TOKEN_PROTOCOL].token);
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p += wsi->utf8_token[WSI_TOKEN_PROTOCOL].token_len;
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}
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strcpy(p, "\x0d\x0a\x0d\x0a");
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p += strlen("\x0d\x0a\x0d\x0a");
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/* convert the two keys into 32-bit integers */
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if (interpret_key(wsi->utf8_token[WSI_TOKEN_KEY1].token, &key1))
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goto bail;
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if (interpret_key(wsi->utf8_token[WSI_TOKEN_KEY2].token, &key2))
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goto bail;
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/* lay them out in network byte order (MSB first */
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sum[0] = key1 >> 24;
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sum[1] = key1 >> 16;
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sum[2] = key1 >> 8;
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sum[3] = key1;
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sum[4] = key2 >> 24;
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sum[5] = key2 >> 16;
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sum[6] = key2 >> 8;
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sum[7] = key2;
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/* follow them with the challenge token we were sent */
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memcpy(&sum[8], wsi->utf8_token[WSI_TOKEN_CHALLENGE].token, 8);
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/*
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* compute the md5sum of that 16-byte series and use as our
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* payload after our headers
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*/
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MD5(sum, 16, (unsigned char *)p);
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p += 16;
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/* it's complete: go ahead and send it */
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debug("issuing response packet %d len\n", (int)(p - response));
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#ifdef DEBUG
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fwrite(response, 1, p - response, stderr);
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#endif
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n = libwebsocket_write(wsi, (unsigned char *)response,
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p - response, LWS_WRITE_HTTP);
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if (n < 0) {
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fprintf(stderr, "ERROR writing to socket");
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goto bail;
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}
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/* alright clean up and set ourselves into established state */
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free(response);
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wsi->state = WSI_STATE_ESTABLISHED;
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wsi->lws_rx_parse_state = LWS_RXPS_NEW;
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/* notify user code that we're ready to roll */
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if (wsi->protocol->callback)
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wsi->protocol->callback(wsi, LWS_CALLBACK_ESTABLISHED,
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wsi->user_space, NULL, 0);
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return 0;
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bail:
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return -1;
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}
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/*
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* Perform the newer BASE64-encoded handshake scheme
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*/
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static int
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handshake_04(struct libwebsocket *wsi)
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{
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static const char *websocket_magic_guid_04 =
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"258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
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char buf[MAX_WEBSOCKET_04_KEY_LEN + 37];
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unsigned char hash[20];
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int n;
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char *response;
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char *p;
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int fd;
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if (!wsi->utf8_token[WSI_TOKEN_ORIGIN].token_len ||
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!wsi->utf8_token[WSI_TOKEN_HOST].token_len ||
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!wsi->utf8_token[WSI_TOKEN_CHALLENGE].token_len ||
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!wsi->utf8_token[WSI_TOKEN_KEY].token_len)
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/* completed header processing, but missing some bits */
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goto bail;
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if (wsi->utf8_token[WSI_TOKEN_KEY].token_len >=
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MAX_WEBSOCKET_04_KEY_LEN) {
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fprintf(stderr, "Client sent handshake key longer "
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"than max supported %d\n", MAX_WEBSOCKET_04_KEY_LEN);
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goto bail;
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}
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strcpy(buf, wsi->utf8_token[WSI_TOKEN_KEY].token);
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strcpy(buf + wsi->utf8_token[WSI_TOKEN_KEY].token_len,
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websocket_magic_guid_04);
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SHA1((unsigned char *)buf, wsi->utf8_token[WSI_TOKEN_KEY].token_len +
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strlen(websocket_magic_guid_04), hash);
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n = lws_b64_encode_string((char *)hash, buf, sizeof buf);
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if (n < 0) {
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fprintf(stderr, "Base64 encoded hash too long\n");
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goto bail;
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}
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/* allocate the per-connection user memory (if any) */
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if (wsi->protocol->per_session_data_size) {
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wsi->user_space = malloc(
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wsi->protocol->per_session_data_size);
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if (wsi->user_space == NULL) {
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fprintf(stderr, "Out of memory for "
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"conn user space\n");
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goto bail;
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}
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} else
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wsi->user_space = NULL;
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/* create the response packet */
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/* make a buffer big enough for everything */
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response = malloc(256 +
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wsi->utf8_token[WSI_TOKEN_UPGRADE].token_len +
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wsi->utf8_token[WSI_TOKEN_CONNECTION].token_len +
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wsi->utf8_token[WSI_TOKEN_PROTOCOL].token_len);
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if (!response) {
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fprintf(stderr, "Out of memory for response buffer\n");
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goto bail;
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}
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p = response;
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strcpy(p, "HTTP/1.1 101 Switching Protocols\x0d\x0a"
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"Upgrade: WebSocket\x0d\x0a");
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p += strlen("HTTP/1.1 101 Switching Protocols\x0d\x0a"
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"Upgrade: WebSocket\x0d\x0a");
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strcpy(p, "Connection: Upgrade\x0d\x0a"
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"Sec-WebSocket-Accept: ");
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p += strlen("Connection: Upgrade\x0d\x0a"
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"Sec-WebSocket-Accept: ");
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strcpy(p, buf);
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p += n;
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/* select the nonce */
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fd = open(SYSTEM_RANDOM_FILEPATH, O_RDONLY);
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if (fd < 1) {
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fprintf(stderr, "Unable to open random device %s\n",
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SYSTEM_RANDOM_FILEPATH);
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free(wsi->user_space);
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goto bail;
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}
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n = read(fd, hash, 16);
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if (n != 16) {
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fprintf(stderr, "Unable to read from random device %s\n",
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SYSTEM_RANDOM_FILEPATH);
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free(wsi->user_space);
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goto bail;
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}
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close(fd);
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/* encode the nonce */
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n = lws_b64_encode_string((const char *)hash, buf, sizeof buf);
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if (n < 0) {
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fprintf(stderr, "Failed to base 64 encode the nonce\n");
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free(wsi->user_space);
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goto bail;
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}
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/* apply the nonce */
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strcpy(p, buf);
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p += n;
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if (wsi->utf8_token[WSI_TOKEN_PROTOCOL].token) {
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strcpy(p, "\x0d\x0aSec-WebSocket-Protocol: ");
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p += strlen("\x0d\x0aSec-WebSocket-Protocol: ");
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strcpy(p, wsi->utf8_token[WSI_TOKEN_PROTOCOL].token);
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p += wsi->utf8_token[WSI_TOKEN_PROTOCOL].token_len;
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}
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/* end of response packet */
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strcpy(p, "\x0d\x0a\x0d\x0a");
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p += strlen("\x0d\x0a\x0d\x0a");
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debug("issuing response packet %d len\n", (int)(p - response));
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#ifdef DEBUG
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fwrite(response, 1, p - response, stderr);
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#endif
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n = libwebsocket_write(wsi, (unsigned char *)response,
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p - response, LWS_WRITE_HTTP);
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if (n < 0) {
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fprintf(stderr, "ERROR writing to socket");
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goto bail;
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}
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/* alright clean up and set ourselves into established state */
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free(response);
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wsi->state = WSI_STATE_ESTABLISHED;
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wsi->lws_rx_parse_state = LWS_RXPS_NEW;
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/* notify user code that we're ready to roll */
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if (wsi->protocol->callback)
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wsi->protocol->callback(wsi, LWS_CALLBACK_ESTABLISHED,
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wsi->user_space, NULL, 0);
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return 0;
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bail:
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return -1;
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}
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/*
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* -04 of the protocol (actually the 80th version) has a radically different
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* handshake. The 04 spec gives the following idea
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@ -83,7 +386,7 @@ interpret_key(const char *key, unsigned long *result)
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* Sec-WebSocket-Key: dGhlIHNhbXBsZSBub25jZQ==
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* Sec-WebSocket-Origin: http://example.com
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* Sec-WebSocket-Protocol: chat, superchat
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* Sec-WebSocket-Version: 4
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* Sec-WebSocket-Version: 4
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*
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* The handshake from the server looks as follows:
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*
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@ -106,10 +409,6 @@ int
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libwebsocket_read(struct libwebsocket *wsi, unsigned char * buf, size_t len)
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{
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size_t n;
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char *p;
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unsigned long key1, key2;
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unsigned char sum[16];
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char *response;
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switch (wsi->state) {
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case WSI_STATE_HTTP:
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@ -140,34 +439,11 @@ libwebsocket_read(struct libwebsocket *wsi, unsigned char * buf, size_t len)
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return 0;
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}
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/* Websocket - confirm we have all the necessary pieces */
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if (!wsi->utf8_token[WSI_TOKEN_ORIGIN].token_len ||
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!wsi->utf8_token[WSI_TOKEN_HOST].token_len ||
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!wsi->utf8_token[WSI_TOKEN_CHALLENGE].token_len ||
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!wsi->utf8_token[WSI_TOKEN_KEY1].token_len ||
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!wsi->utf8_token[WSI_TOKEN_KEY2].token_len)
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/* completed header processing, but missing some bits */
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goto bail;
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/* are we happy about the draft version client side wants? */
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if (wsi->utf8_token[WSI_TOKEN_DRAFT].token) {
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wsi->ietf_spec_revision =
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atoi(wsi->utf8_token[WSI_TOKEN_DRAFT].token);
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switch (wsi->ietf_spec_revision) {
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case 76:
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case 3:
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break;
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default:
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fprintf(stderr, "Rejecting handshake on seeing "
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"unsupported draft request %d\n",
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wsi->ietf_spec_revision);
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goto bail;
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}
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}
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/* Make sure user side is happy about protocol */
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/*
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* It's websocket
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*
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* Make sure user side is happy about protocol
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*/
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while (wsi->protocol->callback) {
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@ -196,126 +472,35 @@ libwebsocket_read(struct libwebsocket *wsi, unsigned char * buf, size_t len)
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goto bail;
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}
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/* allocate the per-connection user memory (if any) */
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if (wsi->protocol->per_session_data_size) {
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wsi->user_space = malloc(
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wsi->protocol->per_session_data_size);
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if (wsi->user_space == NULL) {
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fprintf(stderr, "Out of memory for "
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"conn user space\n");
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goto bail;
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}
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} else
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wsi->user_space = NULL;
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/* create the response packet */
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/* make a buffer big enough for everything */
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response = malloc(256 +
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wsi->utf8_token[WSI_TOKEN_UPGRADE].token_len +
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wsi->utf8_token[WSI_TOKEN_CONNECTION].token_len +
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wsi->utf8_token[WSI_TOKEN_HOST].token_len +
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wsi->utf8_token[WSI_TOKEN_ORIGIN].token_len +
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wsi->utf8_token[WSI_TOKEN_GET_URI].token_len +
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wsi->utf8_token[WSI_TOKEN_PROTOCOL].token_len);
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if (!response) {
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fprintf(stderr, "Out of memory for response buffer\n");
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goto bail;
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}
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p = response;
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strcpy(p, "HTTP/1.1 101 WebSocket Protocol Handshake\x0d\x0a"
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"Upgrade: WebSocket\x0d\x0a");
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p += strlen("HTTP/1.1 101 WebSocket Protocol Handshake\x0d\x0a"
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"Upgrade: WebSocket\x0d\x0a");
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strcpy(p, "Connection: Upgrade\x0d\x0a"
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"Sec-WebSocket-Origin: ");
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p += strlen("Connection: Upgrade\x0d\x0a"
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"Sec-WebSocket-Origin: ");
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strcpy(p, wsi->utf8_token[WSI_TOKEN_ORIGIN].token);
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p += wsi->utf8_token[WSI_TOKEN_ORIGIN].token_len;
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#ifdef LWS_OPENSSL_SUPPORT
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if (use_ssl) {
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strcpy(p, "\x0d\x0aSec-WebSocket-Location: wss://");
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p += strlen("\x0d\x0aSec-WebSocket-Location: wss://");
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} else {
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#endif
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strcpy(p, "\x0d\x0aSec-WebSocket-Location: ws://");
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p += strlen("\x0d\x0aSec-WebSocket-Location: ws://");
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#ifdef LWS_OPENSSL_SUPPORT
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}
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#endif
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strcpy(p, wsi->utf8_token[WSI_TOKEN_HOST].token);
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p += wsi->utf8_token[WSI_TOKEN_HOST].token_len;
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strcpy(p, wsi->utf8_token[WSI_TOKEN_GET_URI].token);
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p += wsi->utf8_token[WSI_TOKEN_GET_URI].token_len;
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if (wsi->utf8_token[WSI_TOKEN_PROTOCOL].token) {
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strcpy(p, "\x0d\x0aSec-WebSocket-Protocol: ");
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p += strlen("\x0d\x0aSec-WebSocket-Protocol: ");
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strcpy(p, wsi->utf8_token[WSI_TOKEN_PROTOCOL].token);
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p += wsi->utf8_token[WSI_TOKEN_PROTOCOL].token_len;
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}
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strcpy(p, "\x0d\x0a\x0d\x0a");
|
||||
p += strlen("\x0d\x0a\x0d\x0a");
|
||||
|
||||
/* convert the two keys into 32-bit integers */
|
||||
|
||||
if (interpret_key(wsi->utf8_token[WSI_TOKEN_KEY1].token, &key1))
|
||||
goto bail;
|
||||
if (interpret_key(wsi->utf8_token[WSI_TOKEN_KEY2].token, &key2))
|
||||
goto bail;
|
||||
|
||||
/* lay them out in network byte order (MSB first */
|
||||
|
||||
sum[0] = key1 >> 24;
|
||||
sum[1] = key1 >> 16;
|
||||
sum[2] = key1 >> 8;
|
||||
sum[3] = key1;
|
||||
sum[4] = key2 >> 24;
|
||||
sum[5] = key2 >> 16;
|
||||
sum[6] = key2 >> 8;
|
||||
sum[7] = key2;
|
||||
|
||||
/* follow them with the challenge token we were sent */
|
||||
|
||||
memcpy(&sum[8], wsi->utf8_token[WSI_TOKEN_CHALLENGE].token, 8);
|
||||
|
||||
/*
|
||||
* compute the md5sum of that 16-byte series and use as our
|
||||
* payload after our headers
|
||||
* find out which spec version the client is using
|
||||
* if this header is not given, we default to 00 (aka 76)
|
||||
*/
|
||||
|
||||
MD5(sum, 16, (unsigned char *)p);
|
||||
p += 16;
|
||||
if (wsi->utf8_token[WSI_TOKEN_VERSION].token_len)
|
||||
wsi->ietf_spec_revision =
|
||||
atoi(wsi->utf8_token[WSI_TOKEN_VERSION].token);
|
||||
|
||||
/* it's complete: go ahead and send it */
|
||||
/*
|
||||
* Websocket 04+?
|
||||
* confirm we have all the necessary pieces
|
||||
*/
|
||||
|
||||
debug("issuing response packet %d len\n", (int)(p - response));
|
||||
#ifdef DEBUG
|
||||
fwrite(response, 1, p - response, stderr);
|
||||
#endif
|
||||
n = libwebsocket_write(wsi, (unsigned char *)response,
|
||||
p - response, LWS_WRITE_HTTP);
|
||||
if (n < 0) {
|
||||
fprintf(stderr, "ERROR writing to socket");
|
||||
switch (wsi->ietf_spec_revision) {
|
||||
case 0: /* applies to 76 and 00 */
|
||||
if (handshake_76(wsi))
|
||||
goto bail;
|
||||
break;
|
||||
case 4: /* 04 */
|
||||
if (handshake_04(wsi))
|
||||
goto bail;
|
||||
break;
|
||||
default:
|
||||
fprintf(stderr, "Unknown client spec version %d\n",
|
||||
wsi->ietf_spec_revision);
|
||||
goto bail;
|
||||
}
|
||||
|
||||
/* alright clean up and set ourselves into established state */
|
||||
|
||||
free(response);
|
||||
wsi->state = WSI_STATE_ESTABLISHED;
|
||||
wsi->lws_rx_parse_state = LWS_RXPS_NEW;
|
||||
|
||||
/* notify user code that we're ready to roll */
|
||||
|
||||
if (wsi->protocol->callback)
|
||||
wsi->protocol->callback(wsi, LWS_CALLBACK_ESTABLISHED,
|
||||
wsi->user_space, NULL, 0);
|
||||
break;
|
||||
|
||||
case WSI_STATE_ESTABLISHED:
|
||||
|
|
|
|||
|
|
@ -603,12 +603,12 @@ int libwebsocket_create_server(int port,
|
|||
this->wsi[this->fds_count]->user_space = NULL;
|
||||
|
||||
/*
|
||||
* Default protocol is 76
|
||||
* Default protocol is 76 / 00
|
||||
* After 76, there's a header specified to inform which
|
||||
* draft the client wants, when that's seen we modify
|
||||
* the individual connection's spec revision accordingly
|
||||
*/
|
||||
this->wsi[this->fds_count]->ietf_spec_revision = 76;
|
||||
this->wsi[this->fds_count]->ietf_spec_revision = 0;
|
||||
|
||||
fill_in_fds:
|
||||
|
||||
|
|
|
|||
|
|
@ -203,11 +203,11 @@ static int libwebsocket_rx_sm(struct libwebsocket *wsi, unsigned char c)
|
|||
|
||||
switch (wsi->ietf_spec_revision) {
|
||||
/* Firefox 4.0b6 likes this as of 30 Oct */
|
||||
case 76:
|
||||
case 0:
|
||||
if (c == 0xff)
|
||||
wsi->lws_rx_parse_state = LWS_RXPS_SEEN_76_FF;
|
||||
break;
|
||||
case 0:
|
||||
case 4:
|
||||
break;
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -46,6 +46,7 @@
|
|||
#endif
|
||||
|
||||
#include <openssl/md5.h>
|
||||
#include <openssl/sha.h>
|
||||
#include "libwebsockets.h"
|
||||
|
||||
/* #define DEBUG */
|
||||
|
|
@ -73,6 +74,9 @@ extern int use_ssl;
|
|||
#define MAX_BROADCAST_PAYLOAD 1024
|
||||
#define LWS_MAX_PROTOCOLS 10
|
||||
|
||||
#define MAX_WEBSOCKET_04_KEY_LEN 128
|
||||
#define SYSTEM_RANDOM_FILEPATH "/dev/random"
|
||||
|
||||
enum lws_connection_states {
|
||||
WSI_STATE_HTTP,
|
||||
WSI_STATE_HTTP_HEADERS,
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue