henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 1 | /* |
| 2 | * libjingle |
| 3 | * Copyright 2004--2008, Google Inc. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions are met: |
| 7 | * |
| 8 | * 1. Redistributions of source code must retain the above copyright notice, |
| 9 | * this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
| 11 | * this list of conditions and the following disclaimer in the documentation |
| 12 | * and/or other materials provided with the distribution. |
| 13 | * 3. The name of the author may not be used to endorse or promote products |
| 14 | * derived from this software without specific prior written permission. |
| 15 | * |
| 16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| 17 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| 18 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
| 19 | * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 20 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 21 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
| 22 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| 23 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
| 24 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
| 25 | * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 26 | */ |
| 27 | |
| 28 | #if HAVE_CONFIG_H |
| 29 | #include "config.h" |
| 30 | #endif // HAVE_CONFIG_H |
| 31 | |
| 32 | #if HAVE_OPENSSL_SSL_H |
| 33 | |
| 34 | #include "talk/base/opensslstreamadapter.h" |
| 35 | |
| 36 | #include <openssl/bio.h> |
| 37 | #include <openssl/crypto.h> |
| 38 | #include <openssl/err.h> |
| 39 | #include <openssl/rand.h> |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 40 | #include <openssl/x509v3.h> |
| 41 | |
| 42 | #include <vector> |
| 43 | |
| 44 | #include "talk/base/common.h" |
| 45 | #include "talk/base/logging.h" |
| 46 | #include "talk/base/stream.h" |
wu@webrtc.org | 8a77f5b | 2014-02-13 23:18:49 +0000 | [diff] [blame] | 47 | #include "talk/base/openssl.h" |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 48 | #include "talk/base/openssladapter.h" |
| 49 | #include "talk/base/openssldigest.h" |
| 50 | #include "talk/base/opensslidentity.h" |
| 51 | #include "talk/base/stringutils.h" |
| 52 | #include "talk/base/thread.h" |
| 53 | |
| 54 | namespace talk_base { |
| 55 | |
henrike@webrtc.org | 78afd90 | 2014-02-21 23:43:24 +0000 | [diff] [blame] | 56 | #if (OPENSSL_VERSION_NUMBER >= 0x10001000L) |
| 57 | #define HAVE_DTLS_SRTP |
| 58 | #endif |
| 59 | |
| 60 | #ifdef HAVE_DTLS_SRTP |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 61 | // SRTP cipher suite table |
| 62 | struct SrtpCipherMapEntry { |
| 63 | const char* external_name; |
| 64 | const char* internal_name; |
| 65 | }; |
| 66 | |
| 67 | // This isn't elegant, but it's better than an external reference |
| 68 | static SrtpCipherMapEntry SrtpCipherMap[] = { |
| 69 | {"AES_CM_128_HMAC_SHA1_80", "SRTP_AES128_CM_SHA1_80"}, |
| 70 | {"AES_CM_128_HMAC_SHA1_32", "SRTP_AES128_CM_SHA1_32"}, |
| 71 | {NULL, NULL} |
| 72 | }; |
henrike@webrtc.org | 78afd90 | 2014-02-21 23:43:24 +0000 | [diff] [blame] | 73 | #endif |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 74 | |
| 75 | ////////////////////////////////////////////////////////////////////// |
| 76 | // StreamBIO |
| 77 | ////////////////////////////////////////////////////////////////////// |
| 78 | |
| 79 | static int stream_write(BIO* h, const char* buf, int num); |
| 80 | static int stream_read(BIO* h, char* buf, int size); |
| 81 | static int stream_puts(BIO* h, const char* str); |
| 82 | static long stream_ctrl(BIO* h, int cmd, long arg1, void* arg2); |
| 83 | static int stream_new(BIO* h); |
| 84 | static int stream_free(BIO* data); |
| 85 | |
| 86 | static BIO_METHOD methods_stream = { |
| 87 | BIO_TYPE_BIO, |
| 88 | "stream", |
| 89 | stream_write, |
| 90 | stream_read, |
| 91 | stream_puts, |
| 92 | 0, |
| 93 | stream_ctrl, |
| 94 | stream_new, |
| 95 | stream_free, |
| 96 | NULL, |
| 97 | }; |
| 98 | |
| 99 | static BIO_METHOD* BIO_s_stream() { return(&methods_stream); } |
| 100 | |
| 101 | static BIO* BIO_new_stream(StreamInterface* stream) { |
| 102 | BIO* ret = BIO_new(BIO_s_stream()); |
| 103 | if (ret == NULL) |
| 104 | return NULL; |
| 105 | ret->ptr = stream; |
| 106 | return ret; |
| 107 | } |
| 108 | |
| 109 | // bio methods return 1 (or at least non-zero) on success and 0 on failure. |
| 110 | |
| 111 | static int stream_new(BIO* b) { |
| 112 | b->shutdown = 0; |
| 113 | b->init = 1; |
| 114 | b->num = 0; // 1 means end-of-stream |
| 115 | b->ptr = 0; |
| 116 | return 1; |
| 117 | } |
| 118 | |
| 119 | static int stream_free(BIO* b) { |
| 120 | if (b == NULL) |
| 121 | return 0; |
| 122 | return 1; |
| 123 | } |
| 124 | |
| 125 | static int stream_read(BIO* b, char* out, int outl) { |
| 126 | if (!out) |
| 127 | return -1; |
| 128 | StreamInterface* stream = static_cast<StreamInterface*>(b->ptr); |
| 129 | BIO_clear_retry_flags(b); |
| 130 | size_t read; |
| 131 | int error; |
| 132 | StreamResult result = stream->Read(out, outl, &read, &error); |
| 133 | if (result == SR_SUCCESS) { |
| 134 | return read; |
| 135 | } else if (result == SR_EOS) { |
| 136 | b->num = 1; |
| 137 | } else if (result == SR_BLOCK) { |
| 138 | BIO_set_retry_read(b); |
| 139 | } |
| 140 | return -1; |
| 141 | } |
| 142 | |
| 143 | static int stream_write(BIO* b, const char* in, int inl) { |
| 144 | if (!in) |
| 145 | return -1; |
| 146 | StreamInterface* stream = static_cast<StreamInterface*>(b->ptr); |
| 147 | BIO_clear_retry_flags(b); |
| 148 | size_t written; |
| 149 | int error; |
| 150 | StreamResult result = stream->Write(in, inl, &written, &error); |
| 151 | if (result == SR_SUCCESS) { |
| 152 | return written; |
| 153 | } else if (result == SR_BLOCK) { |
| 154 | BIO_set_retry_write(b); |
| 155 | } |
| 156 | return -1; |
| 157 | } |
| 158 | |
| 159 | static int stream_puts(BIO* b, const char* str) { |
| 160 | return stream_write(b, str, strlen(str)); |
| 161 | } |
| 162 | |
| 163 | static long stream_ctrl(BIO* b, int cmd, long num, void* ptr) { |
| 164 | UNUSED(num); |
| 165 | UNUSED(ptr); |
| 166 | |
| 167 | switch (cmd) { |
| 168 | case BIO_CTRL_RESET: |
| 169 | return 0; |
| 170 | case BIO_CTRL_EOF: |
| 171 | return b->num; |
| 172 | case BIO_CTRL_WPENDING: |
| 173 | case BIO_CTRL_PENDING: |
| 174 | return 0; |
| 175 | case BIO_CTRL_FLUSH: |
| 176 | return 1; |
| 177 | default: |
| 178 | return 0; |
| 179 | } |
| 180 | } |
| 181 | |
| 182 | ///////////////////////////////////////////////////////////////////////////// |
| 183 | // OpenSSLStreamAdapter |
| 184 | ///////////////////////////////////////////////////////////////////////////// |
| 185 | |
| 186 | OpenSSLStreamAdapter::OpenSSLStreamAdapter(StreamInterface* stream) |
| 187 | : SSLStreamAdapter(stream), |
| 188 | state_(SSL_NONE), |
| 189 | role_(SSL_CLIENT), |
| 190 | ssl_read_needs_write_(false), ssl_write_needs_read_(false), |
| 191 | ssl_(NULL), ssl_ctx_(NULL), |
| 192 | custom_verification_succeeded_(false), |
| 193 | ssl_mode_(SSL_MODE_TLS) { |
| 194 | } |
| 195 | |
| 196 | OpenSSLStreamAdapter::~OpenSSLStreamAdapter() { |
| 197 | Cleanup(); |
| 198 | } |
| 199 | |
| 200 | void OpenSSLStreamAdapter::SetIdentity(SSLIdentity* identity) { |
| 201 | ASSERT(!identity_); |
| 202 | identity_.reset(static_cast<OpenSSLIdentity*>(identity)); |
| 203 | } |
| 204 | |
| 205 | void OpenSSLStreamAdapter::SetServerRole(SSLRole role) { |
| 206 | role_ = role; |
| 207 | } |
| 208 | |
wu@webrtc.org | 62fe97f | 2013-10-09 15:37:36 +0000 | [diff] [blame] | 209 | bool OpenSSLStreamAdapter::GetPeerCertificate(SSLCertificate** cert) const { |
| 210 | if (!peer_certificate_) |
| 211 | return false; |
| 212 | |
| 213 | *cert = peer_certificate_->GetReference(); |
| 214 | return true; |
| 215 | } |
| 216 | |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 217 | bool OpenSSLStreamAdapter::SetPeerCertificateDigest(const std::string |
| 218 | &digest_alg, |
| 219 | const unsigned char* |
| 220 | digest_val, |
| 221 | size_t digest_len) { |
| 222 | ASSERT(!peer_certificate_); |
| 223 | ASSERT(peer_certificate_digest_algorithm_.size() == 0); |
| 224 | ASSERT(ssl_server_name_.empty()); |
| 225 | size_t expected_len; |
| 226 | |
| 227 | if (!OpenSSLDigest::GetDigestSize(digest_alg, &expected_len)) { |
| 228 | LOG(LS_WARNING) << "Unknown digest algorithm: " << digest_alg; |
| 229 | return false; |
| 230 | } |
| 231 | if (expected_len != digest_len) |
| 232 | return false; |
| 233 | |
| 234 | peer_certificate_digest_value_.SetData(digest_val, digest_len); |
| 235 | peer_certificate_digest_algorithm_ = digest_alg; |
| 236 | |
| 237 | return true; |
| 238 | } |
| 239 | |
| 240 | // Key Extractor interface |
| 241 | bool OpenSSLStreamAdapter::ExportKeyingMaterial(const std::string& label, |
| 242 | const uint8* context, |
| 243 | size_t context_len, |
| 244 | bool use_context, |
| 245 | uint8* result, |
| 246 | size_t result_len) { |
henrike@webrtc.org | 78afd90 | 2014-02-21 23:43:24 +0000 | [diff] [blame] | 247 | #ifdef HAVE_DTLS_SRTP |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 248 | int i; |
| 249 | |
| 250 | i = SSL_export_keying_material(ssl_, result, result_len, |
| 251 | label.c_str(), label.length(), |
| 252 | const_cast<uint8 *>(context), |
| 253 | context_len, use_context); |
| 254 | |
| 255 | if (i != 1) |
| 256 | return false; |
| 257 | |
| 258 | return true; |
henrike@webrtc.org | 78afd90 | 2014-02-21 23:43:24 +0000 | [diff] [blame] | 259 | #else |
| 260 | return false; |
| 261 | #endif |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 262 | } |
| 263 | |
| 264 | bool OpenSSLStreamAdapter::SetDtlsSrtpCiphers( |
| 265 | const std::vector<std::string>& ciphers) { |
henrike@webrtc.org | 78afd90 | 2014-02-21 23:43:24 +0000 | [diff] [blame] | 266 | #ifdef HAVE_DTLS_SRTP |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 267 | std::string internal_ciphers; |
| 268 | |
| 269 | if (state_ != SSL_NONE) |
| 270 | return false; |
| 271 | |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 272 | for (std::vector<std::string>::const_iterator cipher = ciphers.begin(); |
| 273 | cipher != ciphers.end(); ++cipher) { |
| 274 | bool found = false; |
| 275 | for (SrtpCipherMapEntry *entry = SrtpCipherMap; entry->internal_name; |
| 276 | ++entry) { |
| 277 | if (*cipher == entry->external_name) { |
| 278 | found = true; |
| 279 | if (!internal_ciphers.empty()) |
| 280 | internal_ciphers += ":"; |
| 281 | internal_ciphers += entry->internal_name; |
| 282 | break; |
| 283 | } |
| 284 | } |
| 285 | |
| 286 | if (!found) { |
| 287 | LOG(LS_ERROR) << "Could not find cipher: " << *cipher; |
| 288 | return false; |
| 289 | } |
| 290 | } |
| 291 | |
| 292 | if (internal_ciphers.empty()) |
| 293 | return false; |
| 294 | |
| 295 | srtp_ciphers_ = internal_ciphers; |
| 296 | return true; |
henrike@webrtc.org | 78afd90 | 2014-02-21 23:43:24 +0000 | [diff] [blame] | 297 | #else |
| 298 | return false; |
| 299 | #endif |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 300 | } |
| 301 | |
| 302 | bool OpenSSLStreamAdapter::GetDtlsSrtpCipher(std::string* cipher) { |
henrike@webrtc.org | 78afd90 | 2014-02-21 23:43:24 +0000 | [diff] [blame] | 303 | #ifdef HAVE_DTLS_SRTP |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 304 | ASSERT(state_ == SSL_CONNECTED); |
| 305 | if (state_ != SSL_CONNECTED) |
| 306 | return false; |
| 307 | |
| 308 | SRTP_PROTECTION_PROFILE *srtp_profile = |
| 309 | SSL_get_selected_srtp_profile(ssl_); |
| 310 | |
| 311 | if (!srtp_profile) |
| 312 | return false; |
| 313 | |
| 314 | for (SrtpCipherMapEntry *entry = SrtpCipherMap; |
| 315 | entry->internal_name; ++entry) { |
| 316 | if (!strcmp(entry->internal_name, srtp_profile->name)) { |
| 317 | *cipher = entry->external_name; |
| 318 | return true; |
| 319 | } |
| 320 | } |
| 321 | |
| 322 | ASSERT(false); // This should never happen |
| 323 | |
| 324 | return false; |
henrike@webrtc.org | 78afd90 | 2014-02-21 23:43:24 +0000 | [diff] [blame] | 325 | #else |
| 326 | return false; |
| 327 | #endif |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 328 | } |
| 329 | |
| 330 | int OpenSSLStreamAdapter::StartSSLWithServer(const char* server_name) { |
| 331 | ASSERT(server_name != NULL && server_name[0] != '\0'); |
| 332 | ssl_server_name_ = server_name; |
| 333 | return StartSSL(); |
| 334 | } |
| 335 | |
| 336 | int OpenSSLStreamAdapter::StartSSLWithPeer() { |
| 337 | ASSERT(ssl_server_name_.empty()); |
| 338 | // It is permitted to specify peer_certificate_ only later. |
| 339 | return StartSSL(); |
| 340 | } |
| 341 | |
| 342 | void OpenSSLStreamAdapter::SetMode(SSLMode mode) { |
| 343 | ASSERT(state_ == SSL_NONE); |
| 344 | ssl_mode_ = mode; |
| 345 | } |
| 346 | |
| 347 | // |
| 348 | // StreamInterface Implementation |
| 349 | // |
| 350 | |
| 351 | StreamResult OpenSSLStreamAdapter::Write(const void* data, size_t data_len, |
| 352 | size_t* written, int* error) { |
| 353 | LOG(LS_VERBOSE) << "OpenSSLStreamAdapter::Write(" << data_len << ")"; |
| 354 | |
| 355 | switch (state_) { |
| 356 | case SSL_NONE: |
| 357 | // pass-through in clear text |
| 358 | return StreamAdapterInterface::Write(data, data_len, written, error); |
| 359 | |
| 360 | case SSL_WAIT: |
| 361 | case SSL_CONNECTING: |
| 362 | return SR_BLOCK; |
| 363 | |
| 364 | case SSL_CONNECTED: |
| 365 | break; |
| 366 | |
| 367 | case SSL_ERROR: |
| 368 | case SSL_CLOSED: |
| 369 | default: |
| 370 | if (error) |
| 371 | *error = ssl_error_code_; |
| 372 | return SR_ERROR; |
| 373 | } |
| 374 | |
| 375 | // OpenSSL will return an error if we try to write zero bytes |
| 376 | if (data_len == 0) { |
| 377 | if (written) |
| 378 | *written = 0; |
| 379 | return SR_SUCCESS; |
| 380 | } |
| 381 | |
| 382 | ssl_write_needs_read_ = false; |
| 383 | |
| 384 | int code = SSL_write(ssl_, data, data_len); |
| 385 | int ssl_error = SSL_get_error(ssl_, code); |
| 386 | switch (ssl_error) { |
| 387 | case SSL_ERROR_NONE: |
| 388 | LOG(LS_VERBOSE) << " -- success"; |
| 389 | ASSERT(0 < code && static_cast<unsigned>(code) <= data_len); |
| 390 | if (written) |
| 391 | *written = code; |
| 392 | return SR_SUCCESS; |
| 393 | case SSL_ERROR_WANT_READ: |
| 394 | LOG(LS_VERBOSE) << " -- error want read"; |
| 395 | ssl_write_needs_read_ = true; |
| 396 | return SR_BLOCK; |
| 397 | case SSL_ERROR_WANT_WRITE: |
| 398 | LOG(LS_VERBOSE) << " -- error want write"; |
| 399 | return SR_BLOCK; |
| 400 | |
| 401 | case SSL_ERROR_ZERO_RETURN: |
| 402 | default: |
| 403 | Error("SSL_write", (ssl_error ? ssl_error : -1), false); |
| 404 | if (error) |
| 405 | *error = ssl_error_code_; |
| 406 | return SR_ERROR; |
| 407 | } |
| 408 | // not reached |
| 409 | } |
| 410 | |
| 411 | StreamResult OpenSSLStreamAdapter::Read(void* data, size_t data_len, |
| 412 | size_t* read, int* error) { |
| 413 | LOG(LS_VERBOSE) << "OpenSSLStreamAdapter::Read(" << data_len << ")"; |
| 414 | switch (state_) { |
| 415 | case SSL_NONE: |
| 416 | // pass-through in clear text |
| 417 | return StreamAdapterInterface::Read(data, data_len, read, error); |
| 418 | |
| 419 | case SSL_WAIT: |
| 420 | case SSL_CONNECTING: |
| 421 | return SR_BLOCK; |
| 422 | |
| 423 | case SSL_CONNECTED: |
| 424 | break; |
| 425 | |
| 426 | case SSL_CLOSED: |
| 427 | return SR_EOS; |
| 428 | |
| 429 | case SSL_ERROR: |
| 430 | default: |
| 431 | if (error) |
| 432 | *error = ssl_error_code_; |
| 433 | return SR_ERROR; |
| 434 | } |
| 435 | |
| 436 | // Don't trust OpenSSL with zero byte reads |
| 437 | if (data_len == 0) { |
| 438 | if (read) |
| 439 | *read = 0; |
| 440 | return SR_SUCCESS; |
| 441 | } |
| 442 | |
| 443 | ssl_read_needs_write_ = false; |
| 444 | |
| 445 | int code = SSL_read(ssl_, data, data_len); |
| 446 | int ssl_error = SSL_get_error(ssl_, code); |
| 447 | switch (ssl_error) { |
| 448 | case SSL_ERROR_NONE: |
| 449 | LOG(LS_VERBOSE) << " -- success"; |
| 450 | ASSERT(0 < code && static_cast<unsigned>(code) <= data_len); |
| 451 | if (read) |
| 452 | *read = code; |
| 453 | |
| 454 | if (ssl_mode_ == SSL_MODE_DTLS) { |
| 455 | // Enforce atomic reads -- this is a short read |
| 456 | unsigned int pending = SSL_pending(ssl_); |
| 457 | |
| 458 | if (pending) { |
| 459 | LOG(LS_INFO) << " -- short DTLS read. flushing"; |
| 460 | FlushInput(pending); |
| 461 | if (error) |
| 462 | *error = SSE_MSG_TRUNC; |
| 463 | return SR_ERROR; |
| 464 | } |
| 465 | } |
| 466 | return SR_SUCCESS; |
| 467 | case SSL_ERROR_WANT_READ: |
| 468 | LOG(LS_VERBOSE) << " -- error want read"; |
| 469 | return SR_BLOCK; |
| 470 | case SSL_ERROR_WANT_WRITE: |
| 471 | LOG(LS_VERBOSE) << " -- error want write"; |
| 472 | ssl_read_needs_write_ = true; |
| 473 | return SR_BLOCK; |
| 474 | case SSL_ERROR_ZERO_RETURN: |
| 475 | LOG(LS_VERBOSE) << " -- remote side closed"; |
| 476 | return SR_EOS; |
| 477 | break; |
| 478 | default: |
| 479 | LOG(LS_VERBOSE) << " -- error " << code; |
| 480 | Error("SSL_read", (ssl_error ? ssl_error : -1), false); |
| 481 | if (error) |
| 482 | *error = ssl_error_code_; |
| 483 | return SR_ERROR; |
| 484 | } |
| 485 | // not reached |
| 486 | } |
| 487 | |
| 488 | void OpenSSLStreamAdapter::FlushInput(unsigned int left) { |
| 489 | unsigned char buf[2048]; |
| 490 | |
| 491 | while (left) { |
| 492 | // This should always succeed |
| 493 | int toread = (sizeof(buf) < left) ? sizeof(buf) : left; |
| 494 | int code = SSL_read(ssl_, buf, toread); |
| 495 | |
| 496 | int ssl_error = SSL_get_error(ssl_, code); |
| 497 | ASSERT(ssl_error == SSL_ERROR_NONE); |
| 498 | |
| 499 | if (ssl_error != SSL_ERROR_NONE) { |
| 500 | LOG(LS_VERBOSE) << " -- error " << code; |
| 501 | Error("SSL_read", (ssl_error ? ssl_error : -1), false); |
| 502 | return; |
| 503 | } |
| 504 | |
| 505 | LOG(LS_VERBOSE) << " -- flushed " << code << " bytes"; |
| 506 | left -= code; |
| 507 | } |
| 508 | } |
| 509 | |
| 510 | void OpenSSLStreamAdapter::Close() { |
| 511 | Cleanup(); |
| 512 | ASSERT(state_ == SSL_CLOSED || state_ == SSL_ERROR); |
| 513 | StreamAdapterInterface::Close(); |
| 514 | } |
| 515 | |
| 516 | StreamState OpenSSLStreamAdapter::GetState() const { |
| 517 | switch (state_) { |
| 518 | case SSL_WAIT: |
| 519 | case SSL_CONNECTING: |
| 520 | return SS_OPENING; |
| 521 | case SSL_CONNECTED: |
| 522 | return SS_OPEN; |
| 523 | default: |
| 524 | return SS_CLOSED; |
| 525 | }; |
| 526 | // not reached |
| 527 | } |
| 528 | |
| 529 | void OpenSSLStreamAdapter::OnEvent(StreamInterface* stream, int events, |
| 530 | int err) { |
| 531 | int events_to_signal = 0; |
| 532 | int signal_error = 0; |
| 533 | ASSERT(stream == this->stream()); |
| 534 | if ((events & SE_OPEN)) { |
| 535 | LOG(LS_VERBOSE) << "OpenSSLStreamAdapter::OnEvent SE_OPEN"; |
| 536 | if (state_ != SSL_WAIT) { |
| 537 | ASSERT(state_ == SSL_NONE); |
| 538 | events_to_signal |= SE_OPEN; |
| 539 | } else { |
| 540 | state_ = SSL_CONNECTING; |
| 541 | if (int err = BeginSSL()) { |
| 542 | Error("BeginSSL", err, true); |
| 543 | return; |
| 544 | } |
| 545 | } |
| 546 | } |
| 547 | if ((events & (SE_READ|SE_WRITE))) { |
| 548 | LOG(LS_VERBOSE) << "OpenSSLStreamAdapter::OnEvent" |
| 549 | << ((events & SE_READ) ? " SE_READ" : "") |
| 550 | << ((events & SE_WRITE) ? " SE_WRITE" : ""); |
| 551 | if (state_ == SSL_NONE) { |
| 552 | events_to_signal |= events & (SE_READ|SE_WRITE); |
| 553 | } else if (state_ == SSL_CONNECTING) { |
| 554 | if (int err = ContinueSSL()) { |
| 555 | Error("ContinueSSL", err, true); |
| 556 | return; |
| 557 | } |
| 558 | } else if (state_ == SSL_CONNECTED) { |
| 559 | if (((events & SE_READ) && ssl_write_needs_read_) || |
| 560 | (events & SE_WRITE)) { |
| 561 | LOG(LS_VERBOSE) << " -- onStreamWriteable"; |
| 562 | events_to_signal |= SE_WRITE; |
| 563 | } |
| 564 | if (((events & SE_WRITE) && ssl_read_needs_write_) || |
| 565 | (events & SE_READ)) { |
| 566 | LOG(LS_VERBOSE) << " -- onStreamReadable"; |
| 567 | events_to_signal |= SE_READ; |
| 568 | } |
| 569 | } |
| 570 | } |
| 571 | if ((events & SE_CLOSE)) { |
| 572 | LOG(LS_VERBOSE) << "OpenSSLStreamAdapter::OnEvent(SE_CLOSE, " << err << ")"; |
| 573 | Cleanup(); |
| 574 | events_to_signal |= SE_CLOSE; |
| 575 | // SE_CLOSE is the only event that uses the final parameter to OnEvent(). |
| 576 | ASSERT(signal_error == 0); |
| 577 | signal_error = err; |
| 578 | } |
| 579 | if (events_to_signal) |
| 580 | StreamAdapterInterface::OnEvent(stream, events_to_signal, signal_error); |
| 581 | } |
| 582 | |
| 583 | int OpenSSLStreamAdapter::StartSSL() { |
| 584 | ASSERT(state_ == SSL_NONE); |
| 585 | |
| 586 | if (StreamAdapterInterface::GetState() != SS_OPEN) { |
| 587 | state_ = SSL_WAIT; |
| 588 | return 0; |
| 589 | } |
| 590 | |
| 591 | state_ = SSL_CONNECTING; |
| 592 | if (int err = BeginSSL()) { |
| 593 | Error("BeginSSL", err, false); |
| 594 | return err; |
| 595 | } |
| 596 | |
| 597 | return 0; |
| 598 | } |
| 599 | |
| 600 | int OpenSSLStreamAdapter::BeginSSL() { |
| 601 | ASSERT(state_ == SSL_CONNECTING); |
| 602 | // The underlying stream has open. If we are in peer-to-peer mode |
| 603 | // then a peer certificate must have been specified by now. |
| 604 | ASSERT(!ssl_server_name_.empty() || |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 605 | !peer_certificate_digest_algorithm_.empty()); |
| 606 | LOG(LS_INFO) << "BeginSSL: " |
| 607 | << (!ssl_server_name_.empty() ? ssl_server_name_ : |
| 608 | "with peer"); |
| 609 | |
| 610 | BIO* bio = NULL; |
| 611 | |
| 612 | // First set up the context |
| 613 | ASSERT(ssl_ctx_ == NULL); |
| 614 | ssl_ctx_ = SetupSSLContext(); |
| 615 | if (!ssl_ctx_) |
| 616 | return -1; |
| 617 | |
| 618 | bio = BIO_new_stream(static_cast<StreamInterface*>(stream())); |
| 619 | if (!bio) |
| 620 | return -1; |
| 621 | |
| 622 | ssl_ = SSL_new(ssl_ctx_); |
| 623 | if (!ssl_) { |
| 624 | BIO_free(bio); |
| 625 | return -1; |
| 626 | } |
| 627 | |
| 628 | SSL_set_app_data(ssl_, this); |
| 629 | |
| 630 | SSL_set_bio(ssl_, bio, bio); // the SSL object owns the bio now. |
| 631 | |
| 632 | SSL_set_mode(ssl_, SSL_MODE_ENABLE_PARTIAL_WRITE | |
| 633 | SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER); |
| 634 | |
| 635 | // Do the connect |
| 636 | return ContinueSSL(); |
| 637 | } |
| 638 | |
| 639 | int OpenSSLStreamAdapter::ContinueSSL() { |
| 640 | LOG(LS_VERBOSE) << "ContinueSSL"; |
| 641 | ASSERT(state_ == SSL_CONNECTING); |
| 642 | |
| 643 | // Clear the DTLS timer |
| 644 | Thread::Current()->Clear(this, MSG_TIMEOUT); |
| 645 | |
| 646 | int code = (role_ == SSL_CLIENT) ? SSL_connect(ssl_) : SSL_accept(ssl_); |
| 647 | int ssl_error; |
| 648 | switch (ssl_error = SSL_get_error(ssl_, code)) { |
| 649 | case SSL_ERROR_NONE: |
| 650 | LOG(LS_VERBOSE) << " -- success"; |
| 651 | |
wu@webrtc.org | 2a81a38 | 2014-01-03 22:08:47 +0000 | [diff] [blame] | 652 | if (!SSLPostConnectionCheck(ssl_, ssl_server_name_.c_str(), NULL, |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 653 | peer_certificate_digest_algorithm_)) { |
| 654 | LOG(LS_ERROR) << "TLS post connection check failed"; |
| 655 | return -1; |
| 656 | } |
| 657 | |
| 658 | state_ = SSL_CONNECTED; |
| 659 | StreamAdapterInterface::OnEvent(stream(), SE_OPEN|SE_READ|SE_WRITE, 0); |
| 660 | break; |
| 661 | |
| 662 | case SSL_ERROR_WANT_READ: { |
| 663 | LOG(LS_VERBOSE) << " -- error want read"; |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 664 | struct timeval timeout; |
| 665 | if (DTLSv1_get_timeout(ssl_, &timeout)) { |
| 666 | int delay = timeout.tv_sec * 1000 + timeout.tv_usec/1000; |
| 667 | |
| 668 | Thread::Current()->PostDelayed(delay, this, MSG_TIMEOUT, 0); |
| 669 | } |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 670 | } |
| 671 | break; |
| 672 | |
| 673 | case SSL_ERROR_WANT_WRITE: |
| 674 | LOG(LS_VERBOSE) << " -- error want write"; |
| 675 | break; |
| 676 | |
| 677 | case SSL_ERROR_ZERO_RETURN: |
| 678 | default: |
| 679 | LOG(LS_VERBOSE) << " -- error " << code; |
| 680 | return (ssl_error != 0) ? ssl_error : -1; |
| 681 | } |
| 682 | |
| 683 | return 0; |
| 684 | } |
| 685 | |
| 686 | void OpenSSLStreamAdapter::Error(const char* context, int err, bool signal) { |
| 687 | LOG(LS_WARNING) << "OpenSSLStreamAdapter::Error(" |
| 688 | << context << ", " << err << ")"; |
| 689 | state_ = SSL_ERROR; |
| 690 | ssl_error_code_ = err; |
| 691 | Cleanup(); |
| 692 | if (signal) |
| 693 | StreamAdapterInterface::OnEvent(stream(), SE_CLOSE, err); |
| 694 | } |
| 695 | |
| 696 | void OpenSSLStreamAdapter::Cleanup() { |
| 697 | LOG(LS_INFO) << "Cleanup"; |
| 698 | |
| 699 | if (state_ != SSL_ERROR) { |
| 700 | state_ = SSL_CLOSED; |
| 701 | ssl_error_code_ = 0; |
| 702 | } |
| 703 | |
| 704 | if (ssl_) { |
| 705 | SSL_free(ssl_); |
| 706 | ssl_ = NULL; |
| 707 | } |
| 708 | if (ssl_ctx_) { |
| 709 | SSL_CTX_free(ssl_ctx_); |
| 710 | ssl_ctx_ = NULL; |
| 711 | } |
| 712 | identity_.reset(); |
| 713 | peer_certificate_.reset(); |
| 714 | |
| 715 | // Clear the DTLS timer |
| 716 | Thread::Current()->Clear(this, MSG_TIMEOUT); |
| 717 | } |
| 718 | |
| 719 | |
| 720 | void OpenSSLStreamAdapter::OnMessage(Message* msg) { |
| 721 | // Process our own messages and then pass others to the superclass |
| 722 | if (MSG_TIMEOUT == msg->message_id) { |
| 723 | LOG(LS_INFO) << "DTLS timeout expired"; |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 724 | DTLSv1_handle_timeout(ssl_); |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 725 | ContinueSSL(); |
| 726 | } else { |
| 727 | StreamInterface::OnMessage(msg); |
| 728 | } |
| 729 | } |
| 730 | |
| 731 | SSL_CTX* OpenSSLStreamAdapter::SetupSSLContext() { |
| 732 | SSL_CTX *ctx = NULL; |
| 733 | |
| 734 | if (role_ == SSL_CLIENT) { |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 735 | ctx = SSL_CTX_new(ssl_mode_ == SSL_MODE_DTLS ? |
| 736 | DTLSv1_client_method() : TLSv1_client_method()); |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 737 | } else { |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 738 | ctx = SSL_CTX_new(ssl_mode_ == SSL_MODE_DTLS ? |
| 739 | DTLSv1_server_method() : TLSv1_server_method()); |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 740 | } |
| 741 | if (ctx == NULL) |
| 742 | return NULL; |
| 743 | |
| 744 | if (identity_ && !identity_->ConfigureIdentity(ctx)) { |
| 745 | SSL_CTX_free(ctx); |
| 746 | return NULL; |
| 747 | } |
| 748 | |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 749 | #ifdef _DEBUG |
| 750 | SSL_CTX_set_info_callback(ctx, OpenSSLAdapter::SSLInfoCallback); |
| 751 | #endif |
| 752 | |
| 753 | SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER |SSL_VERIFY_FAIL_IF_NO_PEER_CERT, |
| 754 | SSLVerifyCallback); |
| 755 | SSL_CTX_set_verify_depth(ctx, 4); |
| 756 | SSL_CTX_set_cipher_list(ctx, "ALL:!ADH:!LOW:!EXP:!MD5:@STRENGTH"); |
| 757 | |
henrike@webrtc.org | 78afd90 | 2014-02-21 23:43:24 +0000 | [diff] [blame] | 758 | #ifdef HAVE_DTLS_SRTP |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 759 | if (!srtp_ciphers_.empty()) { |
| 760 | if (SSL_CTX_set_tlsext_use_srtp(ctx, srtp_ciphers_.c_str())) { |
| 761 | SSL_CTX_free(ctx); |
| 762 | return NULL; |
| 763 | } |
| 764 | } |
henrike@webrtc.org | 78afd90 | 2014-02-21 23:43:24 +0000 | [diff] [blame] | 765 | #endif |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 766 | |
| 767 | return ctx; |
| 768 | } |
| 769 | |
| 770 | int OpenSSLStreamAdapter::SSLVerifyCallback(int ok, X509_STORE_CTX* store) { |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 771 | // Get our SSL structure from the store |
| 772 | SSL* ssl = reinterpret_cast<SSL*>(X509_STORE_CTX_get_ex_data( |
| 773 | store, |
| 774 | SSL_get_ex_data_X509_STORE_CTX_idx())); |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 775 | OpenSSLStreamAdapter* stream = |
| 776 | reinterpret_cast<OpenSSLStreamAdapter*>(SSL_get_app_data(ssl)); |
| 777 | |
wu@webrtc.org | 2a81a38 | 2014-01-03 22:08:47 +0000 | [diff] [blame] | 778 | if (stream->peer_certificate_digest_algorithm_.empty()) { |
| 779 | return 0; |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 780 | } |
wu@webrtc.org | 2a81a38 | 2014-01-03 22:08:47 +0000 | [diff] [blame] | 781 | X509* cert = X509_STORE_CTX_get_current_cert(store); |
jiayl@webrtc.org | 1ef7bf9 | 2014-05-30 23:24:08 +0000 | [diff] [blame] | 782 | int depth = X509_STORE_CTX_get_error_depth(store); |
jiayl@webrtc.org | ae50b2d | 2014-05-30 23:14:08 +0000 | [diff] [blame] | 783 | |
| 784 | // For now We ignore the parent certificates and verify the leaf against |
| 785 | // the digest. |
| 786 | // |
| 787 | // TODO(jiayl): Verify the chain is a proper chain and report the chain to |
| 788 | // |stream->peer_certificate_|, like what NSS does. |
| 789 | if (depth > 0) { |
| 790 | LOG(LS_INFO) << "Ignored chained certificate at depth " << depth; |
| 791 | return 1; |
| 792 | } |
| 793 | |
wu@webrtc.org | 2a81a38 | 2014-01-03 22:08:47 +0000 | [diff] [blame] | 794 | unsigned char digest[EVP_MAX_MD_SIZE]; |
pbos@webrtc.org | b951827 | 2014-03-07 15:22:04 +0000 | [diff] [blame] | 795 | size_t digest_length; |
wu@webrtc.org | 2a81a38 | 2014-01-03 22:08:47 +0000 | [diff] [blame] | 796 | if (!OpenSSLCertificate::ComputeDigest( |
| 797 | cert, |
| 798 | stream->peer_certificate_digest_algorithm_, |
| 799 | digest, sizeof(digest), |
| 800 | &digest_length)) { |
| 801 | LOG(LS_WARNING) << "Failed to compute peer cert digest."; |
| 802 | return 0; |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 803 | } |
jiayl@webrtc.org | ae50b2d | 2014-05-30 23:14:08 +0000 | [diff] [blame] | 804 | |
wu@webrtc.org | 2a81a38 | 2014-01-03 22:08:47 +0000 | [diff] [blame] | 805 | Buffer computed_digest(digest, digest_length); |
| 806 | if (computed_digest != stream->peer_certificate_digest_value_) { |
| 807 | LOG(LS_WARNING) << "Rejected peer certificate due to mismatched digest."; |
| 808 | return 0; |
| 809 | } |
| 810 | // Ignore any verification error if the digest matches, since there is no |
| 811 | // value in checking the validity of a self-signed cert issued by untrusted |
| 812 | // sources. |
| 813 | LOG(LS_INFO) << "Accepted peer certificate."; |
jiayl@webrtc.org | ae50b2d | 2014-05-30 23:14:08 +0000 | [diff] [blame] | 814 | |
wu@webrtc.org | 2a81a38 | 2014-01-03 22:08:47 +0000 | [diff] [blame] | 815 | // Record the peer's certificate. |
| 816 | stream->peer_certificate_.reset(new OpenSSLCertificate(cert)); |
| 817 | return 1; |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 818 | } |
| 819 | |
| 820 | // This code is taken from the "Network Security with OpenSSL" |
| 821 | // sample in chapter 5 |
| 822 | bool OpenSSLStreamAdapter::SSLPostConnectionCheck(SSL* ssl, |
| 823 | const char* server_name, |
| 824 | const X509* peer_cert, |
| 825 | const std::string |
| 826 | &peer_digest) { |
| 827 | ASSERT(server_name != NULL); |
| 828 | bool ok; |
| 829 | if (server_name[0] != '\0') { // traditional mode |
| 830 | ok = OpenSSLAdapter::VerifyServerName(ssl, server_name, ignore_bad_cert()); |
| 831 | |
| 832 | if (ok) { |
| 833 | ok = (SSL_get_verify_result(ssl) == X509_V_OK || |
| 834 | custom_verification_succeeded_); |
| 835 | } |
| 836 | } else { // peer-to-peer mode |
| 837 | ASSERT((peer_cert != NULL) || (!peer_digest.empty())); |
| 838 | // no server name validation |
| 839 | ok = true; |
| 840 | } |
| 841 | |
| 842 | if (!ok && ignore_bad_cert()) { |
| 843 | LOG(LS_ERROR) << "SSL_get_verify_result(ssl) = " |
| 844 | << SSL_get_verify_result(ssl); |
| 845 | LOG(LS_INFO) << "Other TLS post connection checks failed."; |
| 846 | ok = true; |
| 847 | } |
| 848 | |
| 849 | return ok; |
| 850 | } |
| 851 | |
| 852 | bool OpenSSLStreamAdapter::HaveDtls() { |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 853 | return true; |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 854 | } |
| 855 | |
| 856 | bool OpenSSLStreamAdapter::HaveDtlsSrtp() { |
henrike@webrtc.org | 78afd90 | 2014-02-21 23:43:24 +0000 | [diff] [blame] | 857 | #ifdef HAVE_DTLS_SRTP |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 858 | return true; |
henrike@webrtc.org | 78afd90 | 2014-02-21 23:43:24 +0000 | [diff] [blame] | 859 | #else |
| 860 | return false; |
| 861 | #endif |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 862 | } |
| 863 | |
| 864 | bool OpenSSLStreamAdapter::HaveExporter() { |
henrike@webrtc.org | 78afd90 | 2014-02-21 23:43:24 +0000 | [diff] [blame] | 865 | #ifdef HAVE_DTLS_SRTP |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 866 | return true; |
henrike@webrtc.org | 78afd90 | 2014-02-21 23:43:24 +0000 | [diff] [blame] | 867 | #else |
| 868 | return false; |
| 869 | #endif |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 870 | } |
| 871 | |
| 872 | } // namespace talk_base |
| 873 | |
| 874 | #endif // HAVE_OPENSSL_SSL_H |