FFmpeg: libavformat/tls.c Source File

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libavformat

tls.c

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1 /*

2 * TLS/SSL Protocol

4 *

5 * This file is part of FFmpeg.

6 *

7 * FFmpeg is free software; you can redistribute it and/or

8 * modify it under the terms of the GNU Lesser General Public

9 * License as published by the Free Software Foundation; either

10 * version 2.1 of the License, or (at your option) any later version.

11 *

12 * FFmpeg is distributed in the hope that it will be useful,

13 * but WITHOUT ANY WARRANTY; without even the implied warranty of

14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

15 * Lesser General Public License for more details.

16 *

17 * You should have received a copy of the GNU Lesser General Public

18 * License along with FFmpeg; if not, write to the Free Software

19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

20 */

22 #include "avformat.h"

23 #include "url.h"

24 #include "libavutil/avstring.h"

25 #include "libavutil/opt.h"

26 #include "libavutil/parseutils.h"

27 #if CONFIG_GNUTLS

28 #include <gnutls/gnutls.h>

29 #include <gnutls/x509.h>

30 #define TLS_read(c, buf, size) gnutls_record_recv(c->session, buf, size)

31 #define TLS_write(c, buf, size) gnutls_record_send(c->session, buf, size)

32 #define TLS_shutdown(c) gnutls_bye(c->session, GNUTLS_SHUT_RDWR)

33 #define TLS_free(c) do { \

34 if (c->session) \

35 gnutls_deinit(c->session); \

36 if (c->cred) \

37 gnutls_certificate_free_credentials(c->cred); \

38 } while (0)

39 #elif CONFIG_OPENSSL

40 #include <openssl/bio.h>

41 #include <openssl/ssl.h>

42 #include <openssl/err.h>

43 #define TLS_read(c, buf, size) SSL_read(c->ssl, buf, size)

44 #define TLS_write(c, buf, size) SSL_write(c->ssl, buf, size)

45 #define TLS_shutdown(c) SSL_shutdown(c->ssl)

46 #define TLS_free(c) do { \

47 if (c->ssl) \

48 SSL_free(c->ssl); \

49 if (c->ctx) \

50 SSL_CTX_free(c->ctx); \

51 } while (0)

52 #endif

53 #include "network.h"

54 #include "os_support.h"

55 #include "internal.h"

56 #if HAVE_POLL_H

57 #include <poll.h>

58 #endif

60 typedef struct {

61 const AVClass *class;

62 URLContext *tcp;

63 #if CONFIG_GNUTLS

64 gnutls_session_t session;

65 gnutls_certificate_credentials_t cred;

66 #elif CONFIG_OPENSSL

67 SSL_CTX *ctx;

68 SSL *ssl;

69 #endif

70 int fd;

71 char *ca_file;

72 int verify;

73 char *cert_file;

74 char *key_file;

75 int listen;

76 } TLSContext;

78 #define OFFSET(x) offsetof(TLSContext, x)

79 #define D AV_OPT_FLAG_DECODING_PARAM

80 #define E AV_OPT_FLAG_ENCODING_PARAM

81 static const AVOption options[] = {

82 {"ca_file", "Certificate Authority database file", OFFSET(ca_file), AV_OPT_TYPE_STRING, .flags = D|E },

83 {"cafile", "Certificate Authority database file", OFFSET(ca_file), AV_OPT_TYPE_STRING, .flags = D|E },

84 {"tls_verify", "Verify the peer certificate", OFFSET(verify), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, .flags = D|E },

85 {"cert_file", "Certificate file", OFFSET(cert_file), AV_OPT_TYPE_STRING, .flags = D|E },

86 {"key_file", "Private key file", OFFSET(key_file), AV_OPT_TYPE_STRING, .flags = D|E },

87 {"listen", "Listen for incoming connections", OFFSET(listen), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, .flags = D|E },

88 { NULL }

89 };

91 static const AVClass tls_class = {

92 .class_name = "tls",

93 .item_name = av_default_item_name,

94 .option = options,

95 .version = LIBAVUTIL_VERSION_INT,

96 };

98 static int do_tls_poll(URLContext *h, int ret)

99 {

100 TLSContext *c = h->priv_data;

101 struct pollfd p = { c->fd, 0, 0 };

102 #if CONFIG_GNUTLS

103 switch (ret) {

104 case GNUTLS_E_AGAIN:

105 case GNUTLS_E_INTERRUPTED:

106 break;

107 case GNUTLS_E_WARNING_ALERT_RECEIVED:

108 av_log(h, AV_LOG_WARNING, "%s\n", gnutls_strerror(ret));

109 break;

110 default:

111 av_log(h, AV_LOG_ERROR, "%s\n", gnutls_strerror(ret));

112 return AVERROR(EIO);

113 }

114 if (gnutls_record_get_direction(c->session))

115 p.events = POLLOUT;

116 else

117 p.events = POLLIN;

118 #elif CONFIG_OPENSSL

119 ret = SSL_get_error(c->ssl, ret);

120 if (ret == SSL_ERROR_WANT_READ) {

121 p.events = POLLIN;

122 } else if (ret == SSL_ERROR_WANT_WRITE) {

123 p.events = POLLOUT;

124 } else {

125 av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));

126 return AVERROR(EIO);

127 }

128 #endif

129 if (h->flags & AVIO_FLAG_NONBLOCK)

130 return AVERROR(EAGAIN);

131 while (1) {

132 int n = poll(&p, 1, 100);

133 if (n > 0)

134 break;

135 if (ff_check_interrupt(&h->interrupt_callback))

136 return AVERROR(EINTR);

137 }

138 return 0;

139 }

140

141 static void set_options(URLContext *h, const char *uri)

142 {

143 TLSContext *c = h->priv_data;

144 char buf[1024];

145 const char *p = strchr(uri, '?');

146 if (!p)

147 return;

148

149 if (!c->ca_file && av_find_info_tag(buf, sizeof(buf), "cafile", p))

150 c->ca_file = av_strdup(buf);

151

152 if (!c->verify && av_find_info_tag(buf, sizeof(buf), "verify", p)) {

153 char *endptr = NULL;

154 c->verify = strtol(buf, &endptr, 10);

155 if (buf == endptr)

156 c->verify = 1;

157 }

158

159 if (!c->cert_file && av_find_info_tag(buf, sizeof(buf), "cert", p))

160 c->cert_file = av_strdup(buf);

161

162 if (!c->key_file && av_find_info_tag(buf, sizeof(buf), "key", p))

163 c->key_file = av_strdup(buf);

164 }

165

166 static int tls_open(URLContext *h, const char *uri, int flags)

167 {

168 TLSContext *c = h->priv_data;

169 int ret;

170 int port;

171 char buf[200], host[200], opts[50] = "";

172 int numerichost = 0;

173 struct addrinfo hints = { 0 }, *ai = NULL;

174 const char *proxy_path;

175 int use_proxy;

176 const char *p = strchr(uri, '?');

177

178 ff_tls_init();

179

180 if(p && av_find_info_tag(buf, sizeof(buf), "listen", p))

181 c->listen = 1;

182 if (c->listen)

183 snprintf(opts, sizeof(opts), "?listen=1");

184

185 av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0, uri);

186 ff_url_join(buf, sizeof(buf), "tcp", NULL, host, port, "%s", opts);

187

188 hints.ai_flags = AI_NUMERICHOST;

189 if (!getaddrinfo(host, NULL, &hints, &ai)) {

190 numerichost = 1;

191 freeaddrinfo(ai);

192 }

193

194 proxy_path = getenv("http_proxy");

195 use_proxy = !ff_http_match_no_proxy(getenv("no_proxy"), host) &&

196 proxy_path != NULL && av_strstart(proxy_path, "http://", NULL);

197

198 if (use_proxy) {

199 char proxy_host[200], proxy_auth[200], dest[200];

200 int proxy_port;

201 av_url_split(NULL, 0, proxy_auth, sizeof(proxy_auth),

202 proxy_host, sizeof(proxy_host), &proxy_port, NULL, 0,

203 proxy_path);

204 ff_url_join(dest, sizeof(dest), NULL, NULL, host, port, NULL);

205 ff_url_join(buf, sizeof(buf), "httpproxy", proxy_auth, proxy_host,

206 proxy_port, "/%s", dest);

207 }

208

209 ret = ffurl_open(&c->tcp, buf, AVIO_FLAG_READ_WRITE,

210 &h->interrupt_callback, NULL);

211 if (ret)

212 goto fail;

213 c->fd = ffurl_get_file_handle(c->tcp);

214

215 #if CONFIG_GNUTLS

216 gnutls_init(&c->session, c->listen ? GNUTLS_SERVER : GNUTLS_CLIENT);

217 if (!c->listen && !numerichost)

218 gnutls_server_name_set(c->session, GNUTLS_NAME_DNS, host, strlen(host));

219 gnutls_certificate_allocate_credentials(&c->cred);

220 set_options(h, uri);

221 if (c->ca_file) {

222 ret = gnutls_certificate_set_x509_trust_file(c->cred, c->ca_file, GNUTLS_X509_FMT_PEM);

223 if (ret < 0)

224 av_log(h, AV_LOG_ERROR, "%s\n", gnutls_strerror(ret));

225 }

226 #if GNUTLS_VERSION_MAJOR >= 3

227 else

228 gnutls_certificate_set_x509_system_trust(c->cred);

229 #endif

230 gnutls_certificate_set_verify_flags(c->cred, c->verify ?

231 GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT : 0);

232 if (c->cert_file && c->key_file) {

233 ret = gnutls_certificate_set_x509_key_file(c->cred,

234 c->cert_file, c->key_file,

235 GNUTLS_X509_FMT_PEM);

236 if (ret < 0) {

237 av_log(h, AV_LOG_ERROR,

238 "Unable to set cert/key files %s and %s: %s\n",

239 c->cert_file, c->key_file, gnutls_strerror(ret));

240 ret = AVERROR(EIO);

241 goto fail;

242 }

243 } else if (c->cert_file || c->key_file)

244 av_log(h, AV_LOG_ERROR, "cert and key required\n");

245 gnutls_credentials_set(c->session, GNUTLS_CRD_CERTIFICATE, c->cred);

246 gnutls_transport_set_ptr(c->session, (gnutls_transport_ptr_t)

247 (intptr_t) c->fd);

248 gnutls_priority_set_direct(c->session, "NORMAL", NULL);

249 while (1) {

250 ret = gnutls_handshake(c->session);

251 if (ret == 0)

252 break;

253 if ((ret = do_tls_poll(h, ret)) < 0)

254 goto fail;

255 }

256 if (c->verify) {

257 unsigned int status, cert_list_size;

258 gnutls_x509_crt_t cert;

259 const gnutls_datum_t *cert_list;

260 if ((ret = gnutls_certificate_verify_peers2(c->session, &status)) < 0) {

261 av_log(h, AV_LOG_ERROR, "Unable to verify peer certificate: %s\n",

262 gnutls_strerror(ret));

263 ret = AVERROR(EIO);

264 goto fail;

265 }

266 if (status & GNUTLS_CERT_INVALID) {

267 av_log(h, AV_LOG_ERROR, "Peer certificate failed verification\n");

268 ret = AVERROR(EIO);

269 goto fail;

270 }

271 if (gnutls_certificate_type_get(c->session) != GNUTLS_CRT_X509) {

272 av_log(h, AV_LOG_ERROR, "Unsupported certificate type\n");

273 ret = AVERROR(EIO);

274 goto fail;

275 }

276 gnutls_x509_crt_init(&cert);

277 cert_list = gnutls_certificate_get_peers(c->session, &cert_list_size);

278 gnutls_x509_crt_import(cert, cert_list, GNUTLS_X509_FMT_DER);

279 ret = gnutls_x509_crt_check_hostname(cert, host);

280 gnutls_x509_crt_deinit(cert);

281 if (!ret) {

282 av_log(h, AV_LOG_ERROR,

283 "The certificate's owner does not match hostname %s\n", host);

284 ret = AVERROR(EIO);

285 goto fail;

286 }

287 }

288 #elif CONFIG_OPENSSL

289 c->ctx = SSL_CTX_new(c->listen ? TLSv1_server_method() : TLSv1_client_method());

290 if (!c->ctx) {

291 av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));

292 ret = AVERROR(EIO);

293 goto fail;

294 }

295 set_options(h, uri);

296 if (c->ca_file) {

297 if (!SSL_CTX_load_verify_locations(c->ctx, c->ca_file, NULL))

298 av_log(h, AV_LOG_ERROR, "SSL_CTX_load_verify_locations %s\n", ERR_error_string(ERR_get_error(), NULL));

299 }

300 if (c->cert_file && !SSL_CTX_use_certificate_chain_file(c->ctx, c->cert_file)) {

301 av_log(h, AV_LOG_ERROR, "Unable to load cert file %s: %s\n",

302 c->cert_file, ERR_error_string(ERR_get_error(), NULL));

303 ret = AVERROR(EIO);

304 goto fail;

305 }

306 if (c->key_file && !SSL_CTX_use_PrivateKey_file(c->ctx, c->key_file, SSL_FILETYPE_PEM)) {

307 av_log(h, AV_LOG_ERROR, "Unable to load key file %s: %s\n",

308 c->key_file, ERR_error_string(ERR_get_error(), NULL));

309 ret = AVERROR(EIO);

310 goto fail;

311 }

312 // Note, this doesn't check that the peer certificate actually matches

313 // the requested hostname.

314 if (c->verify)

315 SSL_CTX_set_verify(c->ctx, SSL_VERIFY_PEER|SSL_VERIFY_FAIL_IF_NO_PEER_CERT, NULL);

316 c->ssl = SSL_new(c->ctx);

317 if (!c->ssl) {

318 av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));

319 ret = AVERROR(EIO);

320 goto fail;

321 }

322 SSL_set_fd(c->ssl, c->fd);

323 if (!c->listen && !numerichost)

324 SSL_set_tlsext_host_name(c->ssl, host);

325 while (1) {

326 ret = c->listen ? SSL_accept(c->ssl) : SSL_connect(c->ssl);

327 if (ret > 0)

328 break;

329 if (ret == 0) {

330 av_log(h, AV_LOG_ERROR, "Unable to negotiate TLS/SSL session\n");

331 ret = AVERROR(EIO);

332 goto fail;

333 }

334 if ((ret = do_tls_poll(h, ret)) < 0)

335 goto fail;

336 }

337 #endif

338 return 0;

339 fail:

340 TLS_free(c);

341 if (c->tcp)

342 ffurl_close(c->tcp);

343 ff_tls_deinit();

344 return ret;

345 }

346

347 static int tls_read(URLContext *h, uint8_t *buf, int size)

348 {

349 TLSContext *c = h->priv_data;

350 while (1) {

351 int ret = TLS_read(c, buf, size);

352 if (ret > 0)

353 return ret;

354 if (ret == 0)

355 return AVERROR_EOF;

356 if ((ret = do_tls_poll(h, ret)) < 0)

357 return ret;

358 }

359 return 0;

360 }

361

362 static int tls_write(URLContext *h, const uint8_t *buf, int size)

363 {

364 TLSContext *c = h->priv_data;

365 while (1) {

366 int ret = TLS_write(c, buf, size);

367 if (ret > 0)

368 return ret;

369 if (ret == 0)

370 return AVERROR_EOF;

371 if ((ret = do_tls_poll(h, ret)) < 0)

372 return ret;

373 }

374 return 0;

375 }

376

377 static int tls_close(URLContext *h)

378 {

379 TLSContext *c = h->priv_data;

380 TLS_shutdown(c);

381 TLS_free(c);

382 ffurl_close(c->tcp);

383 ff_tls_deinit();

384 return 0;

385 }

386

387 URLProtocol ff_tls_protocol = {

388 .name = "tls",

389 .url_open = tls_open,

390 .url_read = tls_read,

391 .url_write = tls_write,

392 .url_close = tls_close,

393 .priv_data_size = sizeof(TLSContext),

394 .flags = URL_PROTOCOL_FLAG_NETWORK,

395 .priv_data_class = &tls_class,

396 };

Generated on Sat Jan 25 2014 19:52:05 for FFmpeg by doxygen 1.8.2