henrike@webrtc.org | 47be73b | 2014-05-13 18:00:26 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2004 The WebRTC Project Authors. All rights reserved. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license |
| 5 | * that can be found in the LICENSE file in the root of the source |
| 6 | * tree. An additional intellectual property rights grant can be found |
| 7 | * in the file PATENTS. All contributing project authors may |
| 8 | * be found in the AUTHORS file in the root of the source tree. |
| 9 | */ |
| 10 | |
| 11 | #include <vector> |
| 12 | |
| 13 | #if HAVE_CONFIG_H |
| 14 | #include "config.h" |
| 15 | #endif // HAVE_CONFIG_H |
| 16 | |
| 17 | #if HAVE_NSS_SSL_H |
| 18 | |
| 19 | #include "webrtc/base/nssstreamadapter.h" |
| 20 | |
| 21 | #include "keyhi.h" |
| 22 | #include "nspr.h" |
| 23 | #include "nss.h" |
| 24 | #include "pk11pub.h" |
| 25 | #include "secerr.h" |
| 26 | |
| 27 | #ifdef NSS_SSL_RELATIVE_PATH |
| 28 | #include "ssl.h" |
| 29 | #include "sslerr.h" |
| 30 | #include "sslproto.h" |
| 31 | #else |
| 32 | #include "net/third_party/nss/ssl/ssl.h" |
| 33 | #include "net/third_party/nss/ssl/sslerr.h" |
| 34 | #include "net/third_party/nss/ssl/sslproto.h" |
| 35 | #endif |
| 36 | |
| 37 | #include "webrtc/base/nssidentity.h" |
| 38 | #include "webrtc/base/safe_conversions.h" |
| 39 | #include "webrtc/base/thread.h" |
| 40 | |
| 41 | namespace rtc { |
| 42 | |
| 43 | PRDescIdentity NSSStreamAdapter::nspr_layer_identity = PR_INVALID_IO_LAYER; |
| 44 | |
| 45 | #define UNIMPLEMENTED \ |
| 46 | PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0); \ |
| 47 | LOG(LS_ERROR) \ |
| 48 | << "Call to unimplemented function "<< __FUNCTION__; ASSERT(false) |
| 49 | |
| 50 | #ifdef SRTP_AES128_CM_HMAC_SHA1_80 |
| 51 | #define HAVE_DTLS_SRTP |
| 52 | #endif |
| 53 | |
| 54 | #ifdef HAVE_DTLS_SRTP |
| 55 | // SRTP cipher suite table |
| 56 | struct SrtpCipherMapEntry { |
| 57 | const char* external_name; |
| 58 | PRUint16 cipher_id; |
| 59 | }; |
| 60 | |
| 61 | // This isn't elegant, but it's better than an external reference |
| 62 | static const SrtpCipherMapEntry kSrtpCipherMap[] = { |
| 63 | {"AES_CM_128_HMAC_SHA1_80", SRTP_AES128_CM_HMAC_SHA1_80 }, |
| 64 | {"AES_CM_128_HMAC_SHA1_32", SRTP_AES128_CM_HMAC_SHA1_32 }, |
| 65 | {NULL, 0} |
| 66 | }; |
| 67 | #endif |
| 68 | |
| 69 | |
| 70 | // Implementation of NSPR methods |
| 71 | static PRStatus StreamClose(PRFileDesc *socket) { |
| 72 | ASSERT(!socket->lower); |
| 73 | socket->dtor(socket); |
| 74 | return PR_SUCCESS; |
| 75 | } |
| 76 | |
| 77 | static PRInt32 StreamRead(PRFileDesc *socket, void *buf, PRInt32 length) { |
| 78 | StreamInterface *stream = reinterpret_cast<StreamInterface *>(socket->secret); |
| 79 | size_t read; |
| 80 | int error; |
| 81 | StreamResult result = stream->Read(buf, length, &read, &error); |
| 82 | if (result == SR_SUCCESS) { |
| 83 | return checked_cast<PRInt32>(read); |
| 84 | } |
| 85 | |
| 86 | if (result == SR_EOS) { |
| 87 | return 0; |
| 88 | } |
| 89 | |
| 90 | if (result == SR_BLOCK) { |
| 91 | PR_SetError(PR_WOULD_BLOCK_ERROR, 0); |
| 92 | return -1; |
| 93 | } |
| 94 | |
| 95 | PR_SetError(PR_UNKNOWN_ERROR, error); |
| 96 | return -1; |
| 97 | } |
| 98 | |
| 99 | static PRInt32 StreamWrite(PRFileDesc *socket, const void *buf, |
| 100 | PRInt32 length) { |
| 101 | StreamInterface *stream = reinterpret_cast<StreamInterface *>(socket->secret); |
| 102 | size_t written; |
| 103 | int error; |
| 104 | StreamResult result = stream->Write(buf, length, &written, &error); |
| 105 | if (result == SR_SUCCESS) { |
| 106 | return checked_cast<PRInt32>(written); |
| 107 | } |
| 108 | |
| 109 | if (result == SR_BLOCK) { |
| 110 | LOG(LS_INFO) << |
| 111 | "NSSStreamAdapter: write to underlying transport would block"; |
| 112 | PR_SetError(PR_WOULD_BLOCK_ERROR, 0); |
| 113 | return -1; |
| 114 | } |
| 115 | |
| 116 | LOG(LS_ERROR) << "Write error"; |
| 117 | PR_SetError(PR_UNKNOWN_ERROR, error); |
| 118 | return -1; |
| 119 | } |
| 120 | |
| 121 | static PRInt32 StreamAvailable(PRFileDesc *socket) { |
| 122 | UNIMPLEMENTED; |
| 123 | return -1; |
| 124 | } |
| 125 | |
| 126 | PRInt64 StreamAvailable64(PRFileDesc *socket) { |
| 127 | UNIMPLEMENTED; |
| 128 | return -1; |
| 129 | } |
| 130 | |
| 131 | static PRStatus StreamSync(PRFileDesc *socket) { |
| 132 | UNIMPLEMENTED; |
| 133 | return PR_FAILURE; |
| 134 | } |
| 135 | |
| 136 | static PROffset32 StreamSeek(PRFileDesc *socket, PROffset32 offset, |
| 137 | PRSeekWhence how) { |
| 138 | UNIMPLEMENTED; |
| 139 | return -1; |
| 140 | } |
| 141 | |
| 142 | static PROffset64 StreamSeek64(PRFileDesc *socket, PROffset64 offset, |
| 143 | PRSeekWhence how) { |
| 144 | UNIMPLEMENTED; |
| 145 | return -1; |
| 146 | } |
| 147 | |
| 148 | static PRStatus StreamFileInfo(PRFileDesc *socket, PRFileInfo *info) { |
| 149 | UNIMPLEMENTED; |
| 150 | return PR_FAILURE; |
| 151 | } |
| 152 | |
| 153 | static PRStatus StreamFileInfo64(PRFileDesc *socket, PRFileInfo64 *info) { |
| 154 | UNIMPLEMENTED; |
| 155 | return PR_FAILURE; |
| 156 | } |
| 157 | |
| 158 | static PRInt32 StreamWritev(PRFileDesc *socket, const PRIOVec *iov, |
| 159 | PRInt32 iov_size, PRIntervalTime timeout) { |
| 160 | UNIMPLEMENTED; |
| 161 | return -1; |
| 162 | } |
| 163 | |
| 164 | static PRStatus StreamConnect(PRFileDesc *socket, const PRNetAddr *addr, |
| 165 | PRIntervalTime timeout) { |
| 166 | UNIMPLEMENTED; |
| 167 | return PR_FAILURE; |
| 168 | } |
| 169 | |
| 170 | static PRFileDesc *StreamAccept(PRFileDesc *sd, PRNetAddr *addr, |
| 171 | PRIntervalTime timeout) { |
| 172 | UNIMPLEMENTED; |
| 173 | return NULL; |
| 174 | } |
| 175 | |
| 176 | static PRStatus StreamBind(PRFileDesc *socket, const PRNetAddr *addr) { |
| 177 | UNIMPLEMENTED; |
| 178 | return PR_FAILURE; |
| 179 | } |
| 180 | |
| 181 | static PRStatus StreamListen(PRFileDesc *socket, PRIntn depth) { |
| 182 | UNIMPLEMENTED; |
| 183 | return PR_FAILURE; |
| 184 | } |
| 185 | |
| 186 | static PRStatus StreamShutdown(PRFileDesc *socket, PRIntn how) { |
| 187 | UNIMPLEMENTED; |
| 188 | return PR_FAILURE; |
| 189 | } |
| 190 | |
| 191 | // Note: this is always nonblocking and ignores the timeout. |
| 192 | // TODO(ekr@rtfm.com): In future verify that the socket is |
| 193 | // actually in non-blocking mode. |
| 194 | // This function does not support peek. |
| 195 | static PRInt32 StreamRecv(PRFileDesc *socket, void *buf, PRInt32 amount, |
| 196 | PRIntn flags, PRIntervalTime to) { |
| 197 | ASSERT(flags == 0); |
| 198 | |
| 199 | if (flags != 0) { |
| 200 | PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0); |
| 201 | return -1; |
| 202 | } |
| 203 | |
| 204 | return StreamRead(socket, buf, amount); |
| 205 | } |
| 206 | |
| 207 | // Note: this is always nonblocking and assumes a zero timeout. |
| 208 | // This function does not support peek. |
| 209 | static PRInt32 StreamSend(PRFileDesc *socket, const void *buf, |
| 210 | PRInt32 amount, PRIntn flags, |
| 211 | PRIntervalTime to) { |
| 212 | ASSERT(flags == 0); |
| 213 | |
| 214 | return StreamWrite(socket, buf, amount); |
| 215 | } |
| 216 | |
| 217 | static PRInt32 StreamRecvfrom(PRFileDesc *socket, void *buf, |
| 218 | PRInt32 amount, PRIntn flags, |
| 219 | PRNetAddr *addr, PRIntervalTime to) { |
| 220 | UNIMPLEMENTED; |
| 221 | return -1; |
| 222 | } |
| 223 | |
| 224 | static PRInt32 StreamSendto(PRFileDesc *socket, const void *buf, |
| 225 | PRInt32 amount, PRIntn flags, |
| 226 | const PRNetAddr *addr, PRIntervalTime to) { |
| 227 | UNIMPLEMENTED; |
| 228 | return -1; |
| 229 | } |
| 230 | |
| 231 | static PRInt16 StreamPoll(PRFileDesc *socket, PRInt16 in_flags, |
| 232 | PRInt16 *out_flags) { |
| 233 | UNIMPLEMENTED; |
| 234 | return -1; |
| 235 | } |
| 236 | |
| 237 | static PRInt32 StreamAcceptRead(PRFileDesc *sd, PRFileDesc **nd, |
| 238 | PRNetAddr **raddr, |
| 239 | void *buf, PRInt32 amount, PRIntervalTime t) { |
| 240 | UNIMPLEMENTED; |
| 241 | return -1; |
| 242 | } |
| 243 | |
| 244 | static PRInt32 StreamTransmitFile(PRFileDesc *sd, PRFileDesc *socket, |
| 245 | const void *headers, PRInt32 hlen, |
| 246 | PRTransmitFileFlags flags, PRIntervalTime t) { |
| 247 | UNIMPLEMENTED; |
| 248 | return -1; |
| 249 | } |
| 250 | |
| 251 | static PRStatus StreamGetPeerName(PRFileDesc *socket, PRNetAddr *addr) { |
| 252 | // TODO(ekr@rtfm.com): Modify to return unique names for each channel |
| 253 | // somehow, as opposed to always the same static address. The current |
| 254 | // implementation messes up the session cache, which is why it's off |
| 255 | // elsewhere |
| 256 | addr->inet.family = PR_AF_INET; |
| 257 | addr->inet.port = 0; |
| 258 | addr->inet.ip = 0; |
| 259 | |
| 260 | return PR_SUCCESS; |
| 261 | } |
| 262 | |
| 263 | static PRStatus StreamGetSockName(PRFileDesc *socket, PRNetAddr *addr) { |
| 264 | UNIMPLEMENTED; |
| 265 | return PR_FAILURE; |
| 266 | } |
| 267 | |
| 268 | static PRStatus StreamGetSockOption(PRFileDesc *socket, PRSocketOptionData *opt) { |
| 269 | switch (opt->option) { |
| 270 | case PR_SockOpt_Nonblocking: |
| 271 | opt->value.non_blocking = PR_TRUE; |
| 272 | return PR_SUCCESS; |
| 273 | default: |
| 274 | UNIMPLEMENTED; |
| 275 | break; |
| 276 | } |
| 277 | |
| 278 | return PR_FAILURE; |
| 279 | } |
| 280 | |
| 281 | // Imitate setting socket options. These are mostly noops. |
| 282 | static PRStatus StreamSetSockOption(PRFileDesc *socket, |
| 283 | const PRSocketOptionData *opt) { |
| 284 | switch (opt->option) { |
| 285 | case PR_SockOpt_Nonblocking: |
| 286 | return PR_SUCCESS; |
| 287 | case PR_SockOpt_NoDelay: |
| 288 | return PR_SUCCESS; |
| 289 | default: |
| 290 | UNIMPLEMENTED; |
| 291 | break; |
| 292 | } |
| 293 | |
| 294 | return PR_FAILURE; |
| 295 | } |
| 296 | |
| 297 | static PRInt32 StreamSendfile(PRFileDesc *out, PRSendFileData *in, |
| 298 | PRTransmitFileFlags flags, PRIntervalTime to) { |
| 299 | UNIMPLEMENTED; |
| 300 | return -1; |
| 301 | } |
| 302 | |
| 303 | static PRStatus StreamConnectContinue(PRFileDesc *socket, PRInt16 flags) { |
| 304 | UNIMPLEMENTED; |
| 305 | return PR_FAILURE; |
| 306 | } |
| 307 | |
| 308 | static PRIntn StreamReserved(PRFileDesc *socket) { |
| 309 | UNIMPLEMENTED; |
| 310 | return -1; |
| 311 | } |
| 312 | |
| 313 | static const struct PRIOMethods nss_methods = { |
| 314 | PR_DESC_LAYERED, |
| 315 | StreamClose, |
| 316 | StreamRead, |
| 317 | StreamWrite, |
| 318 | StreamAvailable, |
| 319 | StreamAvailable64, |
| 320 | StreamSync, |
| 321 | StreamSeek, |
| 322 | StreamSeek64, |
| 323 | StreamFileInfo, |
| 324 | StreamFileInfo64, |
| 325 | StreamWritev, |
| 326 | StreamConnect, |
| 327 | StreamAccept, |
| 328 | StreamBind, |
| 329 | StreamListen, |
| 330 | StreamShutdown, |
| 331 | StreamRecv, |
| 332 | StreamSend, |
| 333 | StreamRecvfrom, |
| 334 | StreamSendto, |
| 335 | StreamPoll, |
| 336 | StreamAcceptRead, |
| 337 | StreamTransmitFile, |
| 338 | StreamGetSockName, |
| 339 | StreamGetPeerName, |
| 340 | StreamReserved, |
| 341 | StreamReserved, |
| 342 | StreamGetSockOption, |
| 343 | StreamSetSockOption, |
| 344 | StreamSendfile, |
| 345 | StreamConnectContinue, |
| 346 | StreamReserved, |
| 347 | StreamReserved, |
| 348 | StreamReserved, |
| 349 | StreamReserved |
| 350 | }; |
| 351 | |
| 352 | NSSStreamAdapter::NSSStreamAdapter(StreamInterface *stream) |
| 353 | : SSLStreamAdapterHelper(stream), |
| 354 | ssl_fd_(NULL), |
| 355 | cert_ok_(false) { |
| 356 | } |
| 357 | |
| 358 | bool NSSStreamAdapter::Init() { |
| 359 | if (nspr_layer_identity == PR_INVALID_IO_LAYER) { |
| 360 | nspr_layer_identity = PR_GetUniqueIdentity("nssstreamadapter"); |
| 361 | } |
| 362 | PRFileDesc *pr_fd = PR_CreateIOLayerStub(nspr_layer_identity, &nss_methods); |
| 363 | if (!pr_fd) |
| 364 | return false; |
| 365 | pr_fd->secret = reinterpret_cast<PRFilePrivate *>(stream()); |
| 366 | |
| 367 | PRFileDesc *ssl_fd; |
| 368 | if (ssl_mode_ == SSL_MODE_DTLS) { |
| 369 | ssl_fd = DTLS_ImportFD(NULL, pr_fd); |
| 370 | } else { |
| 371 | ssl_fd = SSL_ImportFD(NULL, pr_fd); |
| 372 | } |
| 373 | ASSERT(ssl_fd != NULL); // This should never happen |
| 374 | if (!ssl_fd) { |
| 375 | PR_Close(pr_fd); |
| 376 | return false; |
| 377 | } |
| 378 | |
| 379 | SECStatus rv; |
| 380 | // Turn on security. |
| 381 | rv = SSL_OptionSet(ssl_fd, SSL_SECURITY, PR_TRUE); |
| 382 | if (rv != SECSuccess) { |
| 383 | LOG(LS_ERROR) << "Error enabling security on SSL Socket"; |
| 384 | return false; |
| 385 | } |
| 386 | |
| 387 | // Disable SSLv2. |
| 388 | rv = SSL_OptionSet(ssl_fd, SSL_ENABLE_SSL2, PR_FALSE); |
| 389 | if (rv != SECSuccess) { |
| 390 | LOG(LS_ERROR) << "Error disabling SSL2"; |
| 391 | return false; |
| 392 | } |
| 393 | |
| 394 | // Disable caching. |
| 395 | // TODO(ekr@rtfm.com): restore this when I have the caching |
| 396 | // identity set. |
| 397 | rv = SSL_OptionSet(ssl_fd, SSL_NO_CACHE, PR_TRUE); |
| 398 | if (rv != SECSuccess) { |
| 399 | LOG(LS_ERROR) << "Error disabling cache"; |
| 400 | return false; |
| 401 | } |
| 402 | |
| 403 | // Disable session tickets. |
| 404 | rv = SSL_OptionSet(ssl_fd, SSL_ENABLE_SESSION_TICKETS, PR_FALSE); |
| 405 | if (rv != SECSuccess) { |
| 406 | LOG(LS_ERROR) << "Error enabling tickets"; |
| 407 | return false; |
| 408 | } |
| 409 | |
| 410 | // Disable renegotiation. |
| 411 | rv = SSL_OptionSet(ssl_fd, SSL_ENABLE_RENEGOTIATION, |
| 412 | SSL_RENEGOTIATE_NEVER); |
| 413 | if (rv != SECSuccess) { |
| 414 | LOG(LS_ERROR) << "Error disabling renegotiation"; |
| 415 | return false; |
| 416 | } |
| 417 | |
| 418 | // Disable false start. |
| 419 | rv = SSL_OptionSet(ssl_fd, SSL_ENABLE_FALSE_START, PR_FALSE); |
| 420 | if (rv != SECSuccess) { |
| 421 | LOG(LS_ERROR) << "Error disabling false start"; |
| 422 | return false; |
| 423 | } |
| 424 | |
| 425 | ssl_fd_ = ssl_fd; |
| 426 | |
| 427 | return true; |
| 428 | } |
| 429 | |
| 430 | NSSStreamAdapter::~NSSStreamAdapter() { |
| 431 | if (ssl_fd_) |
| 432 | PR_Close(ssl_fd_); |
| 433 | }; |
| 434 | |
| 435 | |
| 436 | int NSSStreamAdapter::BeginSSL() { |
| 437 | SECStatus rv; |
| 438 | |
| 439 | if (!Init()) { |
| 440 | Error("Init", -1, false); |
| 441 | return -1; |
| 442 | } |
| 443 | |
| 444 | ASSERT(state_ == SSL_CONNECTING); |
| 445 | // The underlying stream has been opened. If we are in peer-to-peer mode |
| 446 | // then a peer certificate must have been specified by now. |
| 447 | ASSERT(!ssl_server_name_.empty() || |
| 448 | peer_certificate_.get() != NULL || |
| 449 | !peer_certificate_digest_algorithm_.empty()); |
| 450 | LOG(LS_INFO) << "BeginSSL: " |
| 451 | << (!ssl_server_name_.empty() ? ssl_server_name_ : |
| 452 | "with peer"); |
| 453 | |
| 454 | if (role_ == SSL_CLIENT) { |
| 455 | LOG(LS_INFO) << "BeginSSL: as client"; |
| 456 | |
| 457 | rv = SSL_GetClientAuthDataHook(ssl_fd_, GetClientAuthDataHook, |
| 458 | this); |
| 459 | if (rv != SECSuccess) { |
| 460 | Error("BeginSSL", -1, false); |
| 461 | return -1; |
| 462 | } |
| 463 | } else { |
| 464 | LOG(LS_INFO) << "BeginSSL: as server"; |
| 465 | NSSIdentity *identity; |
| 466 | |
| 467 | if (identity_.get()) { |
| 468 | identity = static_cast<NSSIdentity *>(identity_.get()); |
| 469 | } else { |
| 470 | LOG(LS_ERROR) << "Can't be an SSL server without an identity"; |
| 471 | Error("BeginSSL", -1, false); |
| 472 | return -1; |
| 473 | } |
| 474 | rv = SSL_ConfigSecureServer(ssl_fd_, identity->certificate().certificate(), |
| 475 | identity->keypair()->privkey(), |
| 476 | kt_rsa); |
| 477 | if (rv != SECSuccess) { |
| 478 | Error("BeginSSL", -1, false); |
| 479 | return -1; |
| 480 | } |
| 481 | |
| 482 | // Insist on a certificate from the client |
| 483 | rv = SSL_OptionSet(ssl_fd_, SSL_REQUEST_CERTIFICATE, PR_TRUE); |
| 484 | if (rv != SECSuccess) { |
| 485 | Error("BeginSSL", -1, false); |
| 486 | return -1; |
| 487 | } |
| 488 | |
| 489 | rv = SSL_OptionSet(ssl_fd_, SSL_REQUIRE_CERTIFICATE, PR_TRUE); |
| 490 | if (rv != SECSuccess) { |
| 491 | Error("BeginSSL", -1, false); |
| 492 | return -1; |
| 493 | } |
| 494 | } |
| 495 | |
| 496 | // Set the version range. |
| 497 | SSLVersionRange vrange; |
| 498 | vrange.min = (ssl_mode_ == SSL_MODE_DTLS) ? |
| 499 | SSL_LIBRARY_VERSION_TLS_1_1 : |
| 500 | SSL_LIBRARY_VERSION_TLS_1_0; |
| 501 | vrange.max = SSL_LIBRARY_VERSION_TLS_1_1; |
| 502 | |
| 503 | rv = SSL_VersionRangeSet(ssl_fd_, &vrange); |
| 504 | if (rv != SECSuccess) { |
| 505 | Error("BeginSSL", -1, false); |
| 506 | return -1; |
| 507 | } |
| 508 | |
| 509 | // SRTP |
| 510 | #ifdef HAVE_DTLS_SRTP |
| 511 | if (!srtp_ciphers_.empty()) { |
| 512 | rv = SSL_SetSRTPCiphers( |
| 513 | ssl_fd_, &srtp_ciphers_[0], |
| 514 | checked_cast<unsigned int>(srtp_ciphers_.size())); |
| 515 | if (rv != SECSuccess) { |
| 516 | Error("BeginSSL", -1, false); |
| 517 | return -1; |
| 518 | } |
| 519 | } |
| 520 | #endif |
| 521 | |
| 522 | // Certificate validation |
| 523 | rv = SSL_AuthCertificateHook(ssl_fd_, AuthCertificateHook, this); |
| 524 | if (rv != SECSuccess) { |
| 525 | Error("BeginSSL", -1, false); |
| 526 | return -1; |
| 527 | } |
| 528 | |
| 529 | // Now start the handshake |
| 530 | rv = SSL_ResetHandshake(ssl_fd_, role_ == SSL_SERVER ? PR_TRUE : PR_FALSE); |
| 531 | if (rv != SECSuccess) { |
| 532 | Error("BeginSSL", -1, false); |
| 533 | return -1; |
| 534 | } |
| 535 | |
| 536 | return ContinueSSL(); |
| 537 | } |
| 538 | |
| 539 | int NSSStreamAdapter::ContinueSSL() { |
| 540 | LOG(LS_INFO) << "ContinueSSL"; |
| 541 | ASSERT(state_ == SSL_CONNECTING); |
| 542 | |
| 543 | // Clear the DTLS timer |
| 544 | Thread::Current()->Clear(this, MSG_DTLS_TIMEOUT); |
| 545 | |
| 546 | SECStatus rv = SSL_ForceHandshake(ssl_fd_); |
| 547 | |
| 548 | if (rv == SECSuccess) { |
| 549 | LOG(LS_INFO) << "Handshake complete"; |
| 550 | |
| 551 | ASSERT(cert_ok_); |
| 552 | if (!cert_ok_) { |
| 553 | Error("ContinueSSL", -1, true); |
| 554 | return -1; |
| 555 | } |
| 556 | |
| 557 | state_ = SSL_CONNECTED; |
| 558 | StreamAdapterInterface::OnEvent(stream(), SE_OPEN|SE_READ|SE_WRITE, 0); |
| 559 | return 0; |
| 560 | } |
| 561 | |
| 562 | PRInt32 err = PR_GetError(); |
| 563 | switch (err) { |
| 564 | case SSL_ERROR_RX_MALFORMED_HANDSHAKE: |
| 565 | if (ssl_mode_ != SSL_MODE_DTLS) { |
| 566 | Error("ContinueSSL", -1, true); |
| 567 | return -1; |
| 568 | } else { |
| 569 | LOG(LS_INFO) << "Malformed DTLS message. Ignoring."; |
| 570 | // Fall through |
| 571 | } |
| 572 | case PR_WOULD_BLOCK_ERROR: |
| 573 | LOG(LS_INFO) << "Would have blocked"; |
| 574 | if (ssl_mode_ == SSL_MODE_DTLS) { |
| 575 | PRIntervalTime timeout; |
| 576 | |
| 577 | SECStatus rv = DTLS_GetHandshakeTimeout(ssl_fd_, &timeout); |
| 578 | if (rv == SECSuccess) { |
| 579 | LOG(LS_INFO) << "Timeout is " << timeout << " ms"; |
| 580 | Thread::Current()->PostDelayed(PR_IntervalToMilliseconds(timeout), |
| 581 | this, MSG_DTLS_TIMEOUT, 0); |
| 582 | } |
| 583 | } |
| 584 | |
| 585 | return 0; |
| 586 | default: |
| 587 | LOG(LS_INFO) << "Error " << err; |
| 588 | break; |
| 589 | } |
| 590 | |
| 591 | Error("ContinueSSL", -1, true); |
| 592 | return -1; |
| 593 | } |
| 594 | |
| 595 | void NSSStreamAdapter::Cleanup() { |
| 596 | if (state_ != SSL_ERROR) { |
| 597 | state_ = SSL_CLOSED; |
| 598 | } |
| 599 | |
| 600 | if (ssl_fd_) { |
| 601 | PR_Close(ssl_fd_); |
| 602 | ssl_fd_ = NULL; |
| 603 | } |
| 604 | |
| 605 | identity_.reset(); |
| 606 | peer_certificate_.reset(); |
| 607 | |
| 608 | Thread::Current()->Clear(this, MSG_DTLS_TIMEOUT); |
| 609 | } |
| 610 | |
| 611 | StreamResult NSSStreamAdapter::Read(void* data, size_t data_len, |
| 612 | size_t* read, int* error) { |
| 613 | // SSL_CONNECTED sanity check. |
| 614 | switch (state_) { |
| 615 | case SSL_NONE: |
| 616 | case SSL_WAIT: |
| 617 | case SSL_CONNECTING: |
| 618 | return SR_BLOCK; |
| 619 | |
| 620 | case SSL_CONNECTED: |
| 621 | break; |
| 622 | |
| 623 | case SSL_CLOSED: |
| 624 | return SR_EOS; |
| 625 | |
| 626 | case SSL_ERROR: |
| 627 | default: |
| 628 | if (error) |
| 629 | *error = ssl_error_code_; |
| 630 | return SR_ERROR; |
| 631 | } |
| 632 | |
| 633 | PRInt32 rv = PR_Read(ssl_fd_, data, checked_cast<PRInt32>(data_len)); |
| 634 | |
| 635 | if (rv == 0) { |
| 636 | return SR_EOS; |
| 637 | } |
| 638 | |
| 639 | // Error |
| 640 | if (rv < 0) { |
| 641 | PRInt32 err = PR_GetError(); |
| 642 | |
| 643 | switch (err) { |
| 644 | case PR_WOULD_BLOCK_ERROR: |
| 645 | return SR_BLOCK; |
| 646 | default: |
| 647 | Error("Read", -1, false); |
| 648 | *error = err; // libjingle semantics are that this is impl-specific |
| 649 | return SR_ERROR; |
| 650 | } |
| 651 | } |
| 652 | |
| 653 | // Success |
| 654 | *read = rv; |
| 655 | |
| 656 | return SR_SUCCESS; |
| 657 | } |
| 658 | |
| 659 | StreamResult NSSStreamAdapter::Write(const void* data, size_t data_len, |
| 660 | size_t* written, int* error) { |
| 661 | // SSL_CONNECTED sanity check. |
| 662 | switch (state_) { |
| 663 | case SSL_NONE: |
| 664 | case SSL_WAIT: |
| 665 | case SSL_CONNECTING: |
| 666 | return SR_BLOCK; |
| 667 | |
| 668 | case SSL_CONNECTED: |
| 669 | break; |
| 670 | |
| 671 | case SSL_ERROR: |
| 672 | case SSL_CLOSED: |
| 673 | default: |
| 674 | if (error) |
| 675 | *error = ssl_error_code_; |
| 676 | return SR_ERROR; |
| 677 | } |
| 678 | |
| 679 | PRInt32 rv = PR_Write(ssl_fd_, data, checked_cast<PRInt32>(data_len)); |
| 680 | |
| 681 | // Error |
| 682 | if (rv < 0) { |
| 683 | PRInt32 err = PR_GetError(); |
| 684 | |
| 685 | switch (err) { |
| 686 | case PR_WOULD_BLOCK_ERROR: |
| 687 | return SR_BLOCK; |
| 688 | default: |
| 689 | Error("Write", -1, false); |
| 690 | *error = err; // libjingle semantics are that this is impl-specific |
| 691 | return SR_ERROR; |
| 692 | } |
| 693 | } |
| 694 | |
| 695 | // Success |
| 696 | *written = rv; |
| 697 | |
| 698 | return SR_SUCCESS; |
| 699 | } |
| 700 | |
| 701 | void NSSStreamAdapter::OnEvent(StreamInterface* stream, int events, |
| 702 | int err) { |
| 703 | int events_to_signal = 0; |
| 704 | int signal_error = 0; |
| 705 | ASSERT(stream == this->stream()); |
| 706 | if ((events & SE_OPEN)) { |
| 707 | LOG(LS_INFO) << "NSSStreamAdapter::OnEvent SE_OPEN"; |
| 708 | if (state_ != SSL_WAIT) { |
| 709 | ASSERT(state_ == SSL_NONE); |
| 710 | events_to_signal |= SE_OPEN; |
| 711 | } else { |
| 712 | state_ = SSL_CONNECTING; |
| 713 | if (int err = BeginSSL()) { |
| 714 | Error("BeginSSL", err, true); |
| 715 | return; |
| 716 | } |
| 717 | } |
| 718 | } |
| 719 | if ((events & (SE_READ|SE_WRITE))) { |
| 720 | LOG(LS_INFO) << "NSSStreamAdapter::OnEvent" |
| 721 | << ((events & SE_READ) ? " SE_READ" : "") |
| 722 | << ((events & SE_WRITE) ? " SE_WRITE" : ""); |
| 723 | if (state_ == SSL_NONE) { |
| 724 | events_to_signal |= events & (SE_READ|SE_WRITE); |
| 725 | } else if (state_ == SSL_CONNECTING) { |
| 726 | if (int err = ContinueSSL()) { |
| 727 | Error("ContinueSSL", err, true); |
| 728 | return; |
| 729 | } |
| 730 | } else if (state_ == SSL_CONNECTED) { |
| 731 | if (events & SE_WRITE) { |
| 732 | LOG(LS_INFO) << " -- onStreamWriteable"; |
| 733 | events_to_signal |= SE_WRITE; |
| 734 | } |
| 735 | if (events & SE_READ) { |
| 736 | LOG(LS_INFO) << " -- onStreamReadable"; |
| 737 | events_to_signal |= SE_READ; |
| 738 | } |
| 739 | } |
| 740 | } |
| 741 | if ((events & SE_CLOSE)) { |
| 742 | LOG(LS_INFO) << "NSSStreamAdapter::OnEvent(SE_CLOSE, " << err << ")"; |
| 743 | Cleanup(); |
| 744 | events_to_signal |= SE_CLOSE; |
| 745 | // SE_CLOSE is the only event that uses the final parameter to OnEvent(). |
| 746 | ASSERT(signal_error == 0); |
| 747 | signal_error = err; |
| 748 | } |
| 749 | if (events_to_signal) |
| 750 | StreamAdapterInterface::OnEvent(stream, events_to_signal, signal_error); |
| 751 | } |
| 752 | |
| 753 | void NSSStreamAdapter::OnMessage(Message* msg) { |
| 754 | // Process our own messages and then pass others to the superclass |
| 755 | if (MSG_DTLS_TIMEOUT == msg->message_id) { |
| 756 | LOG(LS_INFO) << "DTLS timeout expired"; |
| 757 | ContinueSSL(); |
| 758 | } else { |
| 759 | StreamInterface::OnMessage(msg); |
| 760 | } |
| 761 | } |
| 762 | |
| 763 | // Certificate verification callback. Called to check any certificate |
| 764 | SECStatus NSSStreamAdapter::AuthCertificateHook(void *arg, |
| 765 | PRFileDesc *fd, |
| 766 | PRBool checksig, |
| 767 | PRBool isServer) { |
| 768 | LOG(LS_INFO) << "NSSStreamAdapter::AuthCertificateHook"; |
| 769 | // SSL_PeerCertificate returns a pointer that is owned by the caller, and |
| 770 | // the NSSCertificate constructor copies its argument, so |raw_peer_cert| |
| 771 | // must be destroyed in this function. |
| 772 | CERTCertificate* raw_peer_cert = SSL_PeerCertificate(fd); |
| 773 | NSSCertificate peer_cert(raw_peer_cert); |
| 774 | CERT_DestroyCertificate(raw_peer_cert); |
| 775 | |
| 776 | NSSStreamAdapter *stream = reinterpret_cast<NSSStreamAdapter *>(arg); |
| 777 | stream->cert_ok_ = false; |
| 778 | |
| 779 | // Read the peer's certificate chain. |
| 780 | CERTCertList* cert_list = SSL_PeerCertificateChain(fd); |
| 781 | ASSERT(cert_list != NULL); |
| 782 | |
| 783 | // If the peer provided multiple certificates, check that they form a valid |
| 784 | // chain as defined by RFC 5246 Section 7.4.2: "Each following certificate |
| 785 | // MUST directly certify the one preceding it.". This check does NOT |
| 786 | // verify other requirements, such as whether the chain reaches a trusted |
| 787 | // root, self-signed certificates have valid signatures, certificates are not |
| 788 | // expired, etc. |
| 789 | // Even if the chain is valid, the leaf certificate must still match a |
| 790 | // provided certificate or digest. |
| 791 | if (!NSSCertificate::IsValidChain(cert_list)) { |
| 792 | CERT_DestroyCertList(cert_list); |
| 793 | PORT_SetError(SEC_ERROR_BAD_SIGNATURE); |
| 794 | return SECFailure; |
| 795 | } |
| 796 | |
| 797 | if (stream->peer_certificate_.get()) { |
| 798 | LOG(LS_INFO) << "Checking against specified certificate"; |
| 799 | |
| 800 | // The peer certificate was specified |
| 801 | if (reinterpret_cast<NSSCertificate *>(stream->peer_certificate_.get())-> |
| 802 | Equals(&peer_cert)) { |
| 803 | LOG(LS_INFO) << "Accepted peer certificate"; |
| 804 | stream->cert_ok_ = true; |
| 805 | } |
| 806 | } else if (!stream->peer_certificate_digest_algorithm_.empty()) { |
| 807 | LOG(LS_INFO) << "Checking against specified digest"; |
| 808 | // The peer certificate digest was specified |
| 809 | unsigned char digest[64]; // Maximum size |
| 810 | size_t digest_length; |
| 811 | |
| 812 | if (!peer_cert.ComputeDigest( |
| 813 | stream->peer_certificate_digest_algorithm_, |
| 814 | digest, sizeof(digest), &digest_length)) { |
| 815 | LOG(LS_ERROR) << "Digest computation failed"; |
| 816 | } else { |
| 817 | Buffer computed_digest(digest, digest_length); |
| 818 | if (computed_digest == stream->peer_certificate_digest_value_) { |
| 819 | LOG(LS_INFO) << "Accepted peer certificate"; |
| 820 | stream->cert_ok_ = true; |
| 821 | } |
| 822 | } |
| 823 | } else { |
| 824 | // Other modes, but we haven't implemented yet |
| 825 | // TODO(ekr@rtfm.com): Implement real certificate validation |
| 826 | UNIMPLEMENTED; |
| 827 | } |
| 828 | |
| 829 | if (!stream->cert_ok_ && stream->ignore_bad_cert()) { |
| 830 | LOG(LS_WARNING) << "Ignoring cert error while verifying cert chain"; |
| 831 | stream->cert_ok_ = true; |
| 832 | } |
| 833 | |
| 834 | if (stream->cert_ok_) |
| 835 | stream->peer_certificate_.reset(new NSSCertificate(cert_list)); |
| 836 | |
| 837 | CERT_DestroyCertList(cert_list); |
| 838 | |
| 839 | if (stream->cert_ok_) |
| 840 | return SECSuccess; |
| 841 | |
| 842 | PORT_SetError(SEC_ERROR_UNTRUSTED_CERT); |
| 843 | return SECFailure; |
| 844 | } |
| 845 | |
| 846 | |
| 847 | SECStatus NSSStreamAdapter::GetClientAuthDataHook(void *arg, PRFileDesc *fd, |
| 848 | CERTDistNames *caNames, |
| 849 | CERTCertificate **pRetCert, |
| 850 | SECKEYPrivateKey **pRetKey) { |
| 851 | LOG(LS_INFO) << "Client cert requested"; |
| 852 | NSSStreamAdapter *stream = reinterpret_cast<NSSStreamAdapter *>(arg); |
| 853 | |
| 854 | if (!stream->identity_.get()) { |
| 855 | LOG(LS_ERROR) << "No identity available"; |
| 856 | return SECFailure; |
| 857 | } |
| 858 | |
| 859 | NSSIdentity *identity = static_cast<NSSIdentity *>(stream->identity_.get()); |
| 860 | // Destroyed internally by NSS |
| 861 | *pRetCert = CERT_DupCertificate(identity->certificate().certificate()); |
| 862 | *pRetKey = SECKEY_CopyPrivateKey(identity->keypair()->privkey()); |
| 863 | |
| 864 | return SECSuccess; |
| 865 | } |
| 866 | |
| 867 | // RFC 5705 Key Exporter |
| 868 | bool NSSStreamAdapter::ExportKeyingMaterial(const std::string& label, |
| 869 | const uint8* context, |
| 870 | size_t context_len, |
| 871 | bool use_context, |
| 872 | uint8* result, |
| 873 | size_t result_len) { |
| 874 | SECStatus rv = SSL_ExportKeyingMaterial( |
| 875 | ssl_fd_, |
| 876 | label.c_str(), |
| 877 | checked_cast<unsigned int>(label.size()), |
| 878 | use_context, |
| 879 | context, |
| 880 | checked_cast<unsigned int>(context_len), |
| 881 | result, |
| 882 | checked_cast<unsigned int>(result_len)); |
| 883 | |
| 884 | return rv == SECSuccess; |
| 885 | } |
| 886 | |
| 887 | bool NSSStreamAdapter::SetDtlsSrtpCiphers( |
| 888 | const std::vector<std::string>& ciphers) { |
| 889 | #ifdef HAVE_DTLS_SRTP |
| 890 | std::vector<PRUint16> internal_ciphers; |
| 891 | if (state_ != SSL_NONE) |
| 892 | return false; |
| 893 | |
| 894 | for (std::vector<std::string>::const_iterator cipher = ciphers.begin(); |
| 895 | cipher != ciphers.end(); ++cipher) { |
| 896 | bool found = false; |
| 897 | for (const SrtpCipherMapEntry *entry = kSrtpCipherMap; entry->cipher_id; |
| 898 | ++entry) { |
| 899 | if (*cipher == entry->external_name) { |
| 900 | found = true; |
| 901 | internal_ciphers.push_back(entry->cipher_id); |
| 902 | break; |
| 903 | } |
| 904 | } |
| 905 | |
| 906 | if (!found) { |
| 907 | LOG(LS_ERROR) << "Could not find cipher: " << *cipher; |
| 908 | return false; |
| 909 | } |
| 910 | } |
| 911 | |
| 912 | if (internal_ciphers.empty()) |
| 913 | return false; |
| 914 | |
| 915 | srtp_ciphers_ = internal_ciphers; |
| 916 | |
| 917 | return true; |
| 918 | #else |
| 919 | return false; |
| 920 | #endif |
| 921 | } |
| 922 | |
| 923 | bool NSSStreamAdapter::GetDtlsSrtpCipher(std::string* cipher) { |
| 924 | #ifdef HAVE_DTLS_SRTP |
| 925 | ASSERT(state_ == SSL_CONNECTED); |
| 926 | if (state_ != SSL_CONNECTED) |
| 927 | return false; |
| 928 | |
| 929 | PRUint16 selected_cipher; |
| 930 | |
| 931 | SECStatus rv = SSL_GetSRTPCipher(ssl_fd_, &selected_cipher); |
| 932 | if (rv == SECFailure) |
| 933 | return false; |
| 934 | |
| 935 | for (const SrtpCipherMapEntry *entry = kSrtpCipherMap; |
| 936 | entry->cipher_id; ++entry) { |
| 937 | if (selected_cipher == entry->cipher_id) { |
| 938 | *cipher = entry->external_name; |
| 939 | return true; |
| 940 | } |
| 941 | } |
| 942 | |
| 943 | ASSERT(false); // This should never happen |
| 944 | #endif |
| 945 | return false; |
| 946 | } |
| 947 | |
| 948 | |
| 949 | bool NSSContext::initialized; |
| 950 | NSSContext *NSSContext::global_nss_context; |
| 951 | |
| 952 | // Static initialization and shutdown |
| 953 | NSSContext *NSSContext::Instance() { |
| 954 | if (!global_nss_context) { |
| 955 | NSSContext *new_ctx = new NSSContext(); |
| 956 | |
| 957 | if (!(new_ctx->slot_ = PK11_GetInternalSlot())) { |
| 958 | delete new_ctx; |
| 959 | goto fail; |
| 960 | } |
| 961 | |
| 962 | global_nss_context = new_ctx; |
| 963 | } |
| 964 | |
| 965 | fail: |
| 966 | return global_nss_context; |
| 967 | } |
| 968 | |
| 969 | |
| 970 | |
| 971 | bool NSSContext::InitializeSSL(VerificationCallback callback) { |
| 972 | ASSERT(!callback); |
| 973 | |
| 974 | if (!initialized) { |
| 975 | SECStatus rv; |
| 976 | |
| 977 | rv = NSS_NoDB_Init(NULL); |
| 978 | if (rv != SECSuccess) { |
| 979 | LOG(LS_ERROR) << "Couldn't initialize NSS error=" << |
| 980 | PORT_GetError(); |
| 981 | return false; |
| 982 | } |
| 983 | |
| 984 | NSS_SetDomesticPolicy(); |
| 985 | |
| 986 | initialized = true; |
| 987 | } |
| 988 | |
| 989 | return true; |
| 990 | } |
| 991 | |
| 992 | bool NSSContext::InitializeSSLThread() { |
| 993 | // Not needed |
| 994 | return true; |
| 995 | } |
| 996 | |
| 997 | bool NSSContext::CleanupSSL() { |
| 998 | // Not needed |
| 999 | return true; |
| 1000 | } |
| 1001 | |
| 1002 | bool NSSStreamAdapter::HaveDtls() { |
| 1003 | return true; |
| 1004 | } |
| 1005 | |
| 1006 | bool NSSStreamAdapter::HaveDtlsSrtp() { |
| 1007 | #ifdef HAVE_DTLS_SRTP |
| 1008 | return true; |
| 1009 | #else |
| 1010 | return false; |
| 1011 | #endif |
| 1012 | } |
| 1013 | |
| 1014 | bool NSSStreamAdapter::HaveExporter() { |
| 1015 | return true; |
| 1016 | } |
| 1017 | |
| 1018 | } // namespace rtc |
| 1019 | |
| 1020 | #endif // HAVE_NSS_SSL_H |