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| 1 /* | |
| 2 * Copyright 2008 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 "webrtc/base/openssladapter.h" | |
| 12 | |
| 13 #if defined(WEBRTC_POSIX) | |
| 14 #include <unistd.h> | |
| 15 #endif | |
| 16 | |
| 17 // Must be included first before openssl headers. | |
| 18 #include "webrtc/base/win32.h" // NOLINT | |
| 19 | |
| 20 #include <openssl/bio.h> | |
| 21 #include <openssl/crypto.h> | |
| 22 #include <openssl/err.h> | |
| 23 #include <openssl/opensslv.h> | |
| 24 #include <openssl/rand.h> | |
| 25 #include <openssl/x509.h> | |
| 26 #include <openssl/x509v3.h> | |
| 27 | |
| 28 #include "webrtc/base/arraysize.h" | |
| 29 #include "webrtc/base/checks.h" | |
| 30 #include "webrtc/base/logging.h" | |
| 31 #include "webrtc/base/openssl.h" | |
| 32 #include "webrtc/base/safe_conversions.h" | |
| 33 #include "webrtc/base/sslroots.h" | |
| 34 #include "webrtc/base/stringutils.h" | |
| 35 #include "webrtc/base/thread.h" | |
| 36 | |
| 37 #ifndef OPENSSL_IS_BORINGSSL | |
| 38 | |
| 39 // TODO: Use a nicer abstraction for mutex. | |
| 40 | |
| 41 #if defined(WEBRTC_WIN) | |
| 42 #define MUTEX_TYPE HANDLE | |
| 43 #define MUTEX_SETUP(x) (x) = CreateMutex(nullptr, FALSE, nullptr) | |
| 44 #define MUTEX_CLEANUP(x) CloseHandle(x) | |
| 45 #define MUTEX_LOCK(x) WaitForSingleObject((x), INFINITE) | |
| 46 #define MUTEX_UNLOCK(x) ReleaseMutex(x) | |
| 47 #define THREAD_ID GetCurrentThreadId() | |
| 48 #elif defined(WEBRTC_POSIX) | |
| 49 #define MUTEX_TYPE pthread_mutex_t | |
| 50 #define MUTEX_SETUP(x) pthread_mutex_init(&(x), nullptr) | |
| 51 #define MUTEX_CLEANUP(x) pthread_mutex_destroy(&(x)) | |
| 52 #define MUTEX_LOCK(x) pthread_mutex_lock(&(x)) | |
| 53 #define MUTEX_UNLOCK(x) pthread_mutex_unlock(&(x)) | |
| 54 #define THREAD_ID pthread_self() | |
| 55 #else | |
| 56 #error You must define mutex operations appropriate for your platform! | |
| 57 #endif | |
| 58 | |
| 59 struct CRYPTO_dynlock_value { | |
| 60 MUTEX_TYPE mutex; | |
| 61 }; | |
| 62 | |
| 63 #endif // #ifndef OPENSSL_IS_BORINGSSL | |
| 64 | |
| 65 ////////////////////////////////////////////////////////////////////// | |
| 66 // SocketBIO | |
| 67 ////////////////////////////////////////////////////////////////////// | |
| 68 | |
| 69 static int socket_write(BIO* h, const char* buf, int num); | |
| 70 static int socket_read(BIO* h, char* buf, int size); | |
| 71 static int socket_puts(BIO* h, const char* str); | |
| 72 static long socket_ctrl(BIO* h, int cmd, long arg1, void* arg2); | |
| 73 static int socket_new(BIO* h); | |
| 74 static int socket_free(BIO* data); | |
| 75 | |
| 76 // TODO(davidben): This should be const once BoringSSL is assumed. | |
| 77 static BIO_METHOD methods_socket = { | |
| 78 BIO_TYPE_BIO, "socket", socket_write, socket_read, socket_puts, 0, | |
| 79 socket_ctrl, socket_new, socket_free, nullptr, | |
| 80 }; | |
| 81 | |
| 82 static BIO_METHOD* BIO_s_socket2() { return(&methods_socket); } | |
| 83 | |
| 84 static BIO* BIO_new_socket(rtc::AsyncSocket* socket) { | |
| 85 BIO* ret = BIO_new(BIO_s_socket2()); | |
| 86 if (ret == nullptr) { | |
| 87 return nullptr; | |
| 88 } | |
| 89 ret->ptr = socket; | |
| 90 return ret; | |
| 91 } | |
| 92 | |
| 93 static int socket_new(BIO* b) { | |
| 94 b->shutdown = 0; | |
| 95 b->init = 1; | |
| 96 b->num = 0; // 1 means socket closed | |
| 97 b->ptr = 0; | |
| 98 return 1; | |
| 99 } | |
| 100 | |
| 101 static int socket_free(BIO* b) { | |
| 102 if (b == nullptr) | |
| 103 return 0; | |
| 104 return 1; | |
| 105 } | |
| 106 | |
| 107 static int socket_read(BIO* b, char* out, int outl) { | |
| 108 if (!out) | |
| 109 return -1; | |
| 110 rtc::AsyncSocket* socket = static_cast<rtc::AsyncSocket*>(b->ptr); | |
| 111 BIO_clear_retry_flags(b); | |
| 112 int result = socket->Recv(out, outl, nullptr); | |
| 113 if (result > 0) { | |
| 114 return result; | |
| 115 } else if (result == 0) { | |
| 116 b->num = 1; | |
| 117 } else if (socket->IsBlocking()) { | |
| 118 BIO_set_retry_read(b); | |
| 119 } | |
| 120 return -1; | |
| 121 } | |
| 122 | |
| 123 static int socket_write(BIO* b, const char* in, int inl) { | |
| 124 if (!in) | |
| 125 return -1; | |
| 126 rtc::AsyncSocket* socket = static_cast<rtc::AsyncSocket*>(b->ptr); | |
| 127 BIO_clear_retry_flags(b); | |
| 128 int result = socket->Send(in, inl); | |
| 129 if (result > 0) { | |
| 130 return result; | |
| 131 } else if (socket->IsBlocking()) { | |
| 132 BIO_set_retry_write(b); | |
| 133 } | |
| 134 return -1; | |
| 135 } | |
| 136 | |
| 137 static int socket_puts(BIO* b, const char* str) { | |
| 138 return socket_write(b, str, rtc::checked_cast<int>(strlen(str))); | |
| 139 } | |
| 140 | |
| 141 static long socket_ctrl(BIO* b, int cmd, long num, void* ptr) { | |
| 142 switch (cmd) { | |
| 143 case BIO_CTRL_RESET: | |
| 144 return 0; | |
| 145 case BIO_CTRL_EOF: | |
| 146 return b->num; | |
| 147 case BIO_CTRL_WPENDING: | |
| 148 case BIO_CTRL_PENDING: | |
| 149 return 0; | |
| 150 case BIO_CTRL_FLUSH: | |
| 151 return 1; | |
| 152 default: | |
| 153 return 0; | |
| 154 } | |
| 155 } | |
| 156 | |
| 157 static void LogSslError() { | |
| 158 // Walk down the error stack to find the SSL error. | |
| 159 uint32_t error_code; | |
| 160 const char* file; | |
| 161 int line; | |
| 162 do { | |
| 163 error_code = ERR_get_error_line(&file, &line); | |
| 164 if (ERR_GET_LIB(error_code) == ERR_LIB_SSL) { | |
| 165 LOG(LS_ERROR) << "ERR_LIB_SSL: " << error_code << ", " << file << ":" | |
| 166 << line; | |
| 167 break; | |
| 168 } | |
| 169 } while (error_code != 0); | |
| 170 } | |
| 171 | |
| 172 ///////////////////////////////////////////////////////////////////////////// | |
| 173 // OpenSSLAdapter | |
| 174 ///////////////////////////////////////////////////////////////////////////// | |
| 175 | |
| 176 namespace rtc { | |
| 177 | |
| 178 #ifndef OPENSSL_IS_BORINGSSL | |
| 179 | |
| 180 // This array will store all of the mutexes available to OpenSSL. | |
| 181 static MUTEX_TYPE* mutex_buf = nullptr; | |
| 182 | |
| 183 static void locking_function(int mode, int n, const char * file, int line) { | |
| 184 if (mode & CRYPTO_LOCK) { | |
| 185 MUTEX_LOCK(mutex_buf[n]); | |
| 186 } else { | |
| 187 MUTEX_UNLOCK(mutex_buf[n]); | |
| 188 } | |
| 189 } | |
| 190 | |
| 191 static unsigned long id_function() { // NOLINT | |
| 192 // Use old-style C cast because THREAD_ID's type varies with the platform, | |
| 193 // in some cases requiring static_cast, and in others requiring | |
| 194 // reinterpret_cast. | |
| 195 return (unsigned long)THREAD_ID; // NOLINT | |
| 196 } | |
| 197 | |
| 198 static CRYPTO_dynlock_value* dyn_create_function(const char* file, int line) { | |
| 199 CRYPTO_dynlock_value* value = new CRYPTO_dynlock_value; | |
| 200 if (!value) | |
| 201 return nullptr; | |
| 202 MUTEX_SETUP(value->mutex); | |
| 203 return value; | |
| 204 } | |
| 205 | |
| 206 static void dyn_lock_function(int mode, CRYPTO_dynlock_value* l, | |
| 207 const char* file, int line) { | |
| 208 if (mode & CRYPTO_LOCK) { | |
| 209 MUTEX_LOCK(l->mutex); | |
| 210 } else { | |
| 211 MUTEX_UNLOCK(l->mutex); | |
| 212 } | |
| 213 } | |
| 214 | |
| 215 static void dyn_destroy_function(CRYPTO_dynlock_value* l, | |
| 216 const char* file, int line) { | |
| 217 MUTEX_CLEANUP(l->mutex); | |
| 218 delete l; | |
| 219 } | |
| 220 | |
| 221 #endif // #ifndef OPENSSL_IS_BORINGSSL | |
| 222 | |
| 223 VerificationCallback OpenSSLAdapter::custom_verify_callback_ = nullptr; | |
| 224 | |
| 225 bool OpenSSLAdapter::InitializeSSL(VerificationCallback callback) { | |
| 226 if (!InitializeSSLThread() || !SSL_library_init()) | |
| 227 return false; | |
| 228 #if !defined(ADDRESS_SANITIZER) || !defined(WEBRTC_MAC) || defined(WEBRTC_IOS) | |
| 229 // Loading the error strings crashes mac_asan. Omit this debugging aid there. | |
| 230 SSL_load_error_strings(); | |
| 231 #endif | |
| 232 ERR_load_BIO_strings(); | |
| 233 OpenSSL_add_all_algorithms(); | |
| 234 RAND_poll(); | |
| 235 custom_verify_callback_ = callback; | |
| 236 return true; | |
| 237 } | |
| 238 | |
| 239 bool OpenSSLAdapter::InitializeSSLThread() { | |
| 240 // BoringSSL is doing the locking internally, so the callbacks are not used | |
| 241 // in this case (and are no-ops anyways). | |
| 242 #ifndef OPENSSL_IS_BORINGSSL | |
| 243 mutex_buf = new MUTEX_TYPE[CRYPTO_num_locks()]; | |
| 244 if (!mutex_buf) | |
| 245 return false; | |
| 246 for (int i = 0; i < CRYPTO_num_locks(); ++i) | |
| 247 MUTEX_SETUP(mutex_buf[i]); | |
| 248 | |
| 249 // we need to cast our id_function to return an unsigned long -- pthread_t is | |
| 250 // a pointer | |
| 251 CRYPTO_set_id_callback(id_function); | |
| 252 CRYPTO_set_locking_callback(locking_function); | |
| 253 CRYPTO_set_dynlock_create_callback(dyn_create_function); | |
| 254 CRYPTO_set_dynlock_lock_callback(dyn_lock_function); | |
| 255 CRYPTO_set_dynlock_destroy_callback(dyn_destroy_function); | |
| 256 #endif // #ifndef OPENSSL_IS_BORINGSSL | |
| 257 return true; | |
| 258 } | |
| 259 | |
| 260 bool OpenSSLAdapter::CleanupSSL() { | |
| 261 #ifndef OPENSSL_IS_BORINGSSL | |
| 262 if (!mutex_buf) | |
| 263 return false; | |
| 264 CRYPTO_set_id_callback(nullptr); | |
| 265 CRYPTO_set_locking_callback(nullptr); | |
| 266 CRYPTO_set_dynlock_create_callback(nullptr); | |
| 267 CRYPTO_set_dynlock_lock_callback(nullptr); | |
| 268 CRYPTO_set_dynlock_destroy_callback(nullptr); | |
| 269 for (int i = 0; i < CRYPTO_num_locks(); ++i) | |
| 270 MUTEX_CLEANUP(mutex_buf[i]); | |
| 271 delete [] mutex_buf; | |
| 272 mutex_buf = nullptr; | |
| 273 #endif // #ifndef OPENSSL_IS_BORINGSSL | |
| 274 return true; | |
| 275 } | |
| 276 | |
| 277 OpenSSLAdapter::OpenSSLAdapter(AsyncSocket* socket) | |
| 278 : SSLAdapter(socket), | |
| 279 state_(SSL_NONE), | |
| 280 ssl_read_needs_write_(false), | |
| 281 ssl_write_needs_read_(false), | |
| 282 restartable_(false), | |
| 283 ssl_(nullptr), | |
| 284 ssl_ctx_(nullptr), | |
| 285 ssl_mode_(SSL_MODE_TLS), | |
| 286 custom_verification_succeeded_(false) {} | |
| 287 | |
| 288 OpenSSLAdapter::~OpenSSLAdapter() { | |
| 289 Cleanup(); | |
| 290 } | |
| 291 | |
| 292 void | |
| 293 OpenSSLAdapter::SetMode(SSLMode mode) { | |
| 294 RTC_DCHECK(state_ == SSL_NONE); | |
| 295 ssl_mode_ = mode; | |
| 296 } | |
| 297 | |
| 298 int | |
| 299 OpenSSLAdapter::StartSSL(const char* hostname, bool restartable) { | |
| 300 if (state_ != SSL_NONE) | |
| 301 return -1; | |
| 302 | |
| 303 ssl_host_name_ = hostname; | |
| 304 restartable_ = restartable; | |
| 305 | |
| 306 if (socket_->GetState() != Socket::CS_CONNECTED) { | |
| 307 state_ = SSL_WAIT; | |
| 308 return 0; | |
| 309 } | |
| 310 | |
| 311 state_ = SSL_CONNECTING; | |
| 312 if (int err = BeginSSL()) { | |
| 313 Error("BeginSSL", err, false); | |
| 314 return err; | |
| 315 } | |
| 316 | |
| 317 return 0; | |
| 318 } | |
| 319 | |
| 320 int | |
| 321 OpenSSLAdapter::BeginSSL() { | |
| 322 LOG(LS_INFO) << "BeginSSL: " << ssl_host_name_; | |
| 323 RTC_DCHECK(state_ == SSL_CONNECTING); | |
| 324 | |
| 325 int err = 0; | |
| 326 BIO* bio = nullptr; | |
| 327 | |
| 328 // First set up the context | |
| 329 if (!ssl_ctx_) | |
| 330 ssl_ctx_ = SetupSSLContext(); | |
| 331 | |
| 332 if (!ssl_ctx_) { | |
| 333 err = -1; | |
| 334 goto ssl_error; | |
| 335 } | |
| 336 | |
| 337 bio = BIO_new_socket(socket_); | |
| 338 if (!bio) { | |
| 339 err = -1; | |
| 340 goto ssl_error; | |
| 341 } | |
| 342 | |
| 343 ssl_ = SSL_new(ssl_ctx_); | |
| 344 if (!ssl_) { | |
| 345 err = -1; | |
| 346 goto ssl_error; | |
| 347 } | |
| 348 | |
| 349 SSL_set_app_data(ssl_, this); | |
| 350 | |
| 351 SSL_set_bio(ssl_, bio, bio); | |
| 352 // SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER allows different buffers to be passed | |
| 353 // into SSL_write when a record could only be partially transmitted (and thus | |
| 354 // requires another call to SSL_write to finish transmission). This allows us | |
| 355 // to copy the data into our own buffer when this occurs, since the original | |
| 356 // buffer can't safely be accessed after control exits Send. | |
| 357 // TODO(deadbeef): Do we want SSL_MODE_ENABLE_PARTIAL_WRITE? It doesn't | |
| 358 // appear Send handles partial writes properly, though maybe we never notice | |
| 359 // since we never send more than 16KB at once.. | |
| 360 SSL_set_mode(ssl_, SSL_MODE_ENABLE_PARTIAL_WRITE | | |
| 361 SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER); | |
| 362 | |
| 363 // Enable SNI. | |
| 364 if (!ssl_host_name_.empty()) { | |
| 365 SSL_set_tlsext_host_name(ssl_, ssl_host_name_.c_str()); | |
| 366 } | |
| 367 | |
| 368 // the SSL object owns the bio now | |
| 369 bio = nullptr; | |
| 370 | |
| 371 // Do the connect | |
| 372 err = ContinueSSL(); | |
| 373 if (err != 0) | |
| 374 goto ssl_error; | |
| 375 | |
| 376 return err; | |
| 377 | |
| 378 ssl_error: | |
| 379 Cleanup(); | |
| 380 if (bio) | |
| 381 BIO_free(bio); | |
| 382 | |
| 383 return err; | |
| 384 } | |
| 385 | |
| 386 int | |
| 387 OpenSSLAdapter::ContinueSSL() { | |
| 388 RTC_DCHECK(state_ == SSL_CONNECTING); | |
| 389 | |
| 390 // Clear the DTLS timer | |
| 391 Thread::Current()->Clear(this, MSG_TIMEOUT); | |
| 392 | |
| 393 int code = SSL_connect(ssl_); | |
| 394 switch (SSL_get_error(ssl_, code)) { | |
| 395 case SSL_ERROR_NONE: | |
| 396 if (!SSLPostConnectionCheck(ssl_, ssl_host_name_.c_str())) { | |
| 397 LOG(LS_ERROR) << "TLS post connection check failed"; | |
| 398 // make sure we close the socket | |
| 399 Cleanup(); | |
| 400 // The connect failed so return -1 to shut down the socket | |
| 401 return -1; | |
| 402 } | |
| 403 | |
| 404 state_ = SSL_CONNECTED; | |
| 405 AsyncSocketAdapter::OnConnectEvent(this); | |
| 406 #if 0 // TODO: worry about this | |
| 407 // Don't let ourselves go away during the callbacks | |
| 408 PRefPtr<OpenSSLAdapter> lock(this); | |
| 409 LOG(LS_INFO) << " -- onStreamReadable"; | |
| 410 AsyncSocketAdapter::OnReadEvent(this); | |
| 411 LOG(LS_INFO) << " -- onStreamWriteable"; | |
| 412 AsyncSocketAdapter::OnWriteEvent(this); | |
| 413 #endif | |
| 414 break; | |
| 415 | |
| 416 case SSL_ERROR_WANT_READ: | |
| 417 LOG(LS_VERBOSE) << " -- error want read"; | |
| 418 struct timeval timeout; | |
| 419 if (DTLSv1_get_timeout(ssl_, &timeout)) { | |
| 420 int delay = timeout.tv_sec * 1000 + timeout.tv_usec/1000; | |
| 421 | |
| 422 Thread::Current()->PostDelayed(RTC_FROM_HERE, delay, this, MSG_TIMEOUT, | |
| 423 0); | |
| 424 } | |
| 425 break; | |
| 426 | |
| 427 case SSL_ERROR_WANT_WRITE: | |
| 428 break; | |
| 429 | |
| 430 case SSL_ERROR_ZERO_RETURN: | |
| 431 default: | |
| 432 LOG(LS_WARNING) << "ContinueSSL -- error " << code; | |
| 433 return (code != 0) ? code : -1; | |
| 434 } | |
| 435 | |
| 436 return 0; | |
| 437 } | |
| 438 | |
| 439 void | |
| 440 OpenSSLAdapter::Error(const char* context, int err, bool signal) { | |
| 441 LOG(LS_WARNING) << "OpenSSLAdapter::Error(" | |
| 442 << context << ", " << err << ")"; | |
| 443 state_ = SSL_ERROR; | |
| 444 SetError(err); | |
| 445 if (signal) | |
| 446 AsyncSocketAdapter::OnCloseEvent(this, err); | |
| 447 } | |
| 448 | |
| 449 void | |
| 450 OpenSSLAdapter::Cleanup() { | |
| 451 LOG(LS_INFO) << "Cleanup"; | |
| 452 | |
| 453 state_ = SSL_NONE; | |
| 454 ssl_read_needs_write_ = false; | |
| 455 ssl_write_needs_read_ = false; | |
| 456 custom_verification_succeeded_ = false; | |
| 457 pending_data_.Clear(); | |
| 458 | |
| 459 if (ssl_) { | |
| 460 SSL_free(ssl_); | |
| 461 ssl_ = nullptr; | |
| 462 } | |
| 463 | |
| 464 if (ssl_ctx_) { | |
| 465 SSL_CTX_free(ssl_ctx_); | |
| 466 ssl_ctx_ = nullptr; | |
| 467 } | |
| 468 | |
| 469 // Clear the DTLS timer | |
| 470 Thread::Current()->Clear(this, MSG_TIMEOUT); | |
| 471 } | |
| 472 | |
| 473 int OpenSSLAdapter::DoSslWrite(const void* pv, size_t cb, int* error) { | |
| 474 // If we have pending data (that was previously only partially written by | |
| 475 // SSL_write), we shouldn't be attempting to write anything else. | |
| 476 RTC_DCHECK(pending_data_.empty() || pv == pending_data_.data()); | |
| 477 RTC_DCHECK(error != nullptr); | |
| 478 | |
| 479 ssl_write_needs_read_ = false; | |
| 480 int ret = SSL_write(ssl_, pv, checked_cast<int>(cb)); | |
| 481 *error = SSL_get_error(ssl_, ret); | |
| 482 switch (*error) { | |
| 483 case SSL_ERROR_NONE: | |
| 484 // Success! | |
| 485 return ret; | |
| 486 case SSL_ERROR_WANT_READ: | |
| 487 LOG(LS_INFO) << " -- error want read"; | |
| 488 ssl_write_needs_read_ = true; | |
| 489 SetError(EWOULDBLOCK); | |
| 490 break; | |
| 491 case SSL_ERROR_WANT_WRITE: | |
| 492 LOG(LS_INFO) << " -- error want write"; | |
| 493 SetError(EWOULDBLOCK); | |
| 494 break; | |
| 495 case SSL_ERROR_ZERO_RETURN: | |
| 496 // LOG(LS_INFO) << " -- remote side closed"; | |
| 497 SetError(EWOULDBLOCK); | |
| 498 // do we need to signal closure? | |
| 499 break; | |
| 500 case SSL_ERROR_SSL: | |
| 501 LogSslError(); | |
| 502 Error("SSL_write", ret ? ret : -1, false); | |
| 503 break; | |
| 504 default: | |
| 505 LOG(LS_WARNING) << "Unknown error from SSL_write: " << *error; | |
| 506 Error("SSL_write", ret ? ret : -1, false); | |
| 507 break; | |
| 508 } | |
| 509 | |
| 510 return SOCKET_ERROR; | |
| 511 } | |
| 512 | |
| 513 // | |
| 514 // AsyncSocket Implementation | |
| 515 // | |
| 516 | |
| 517 int | |
| 518 OpenSSLAdapter::Send(const void* pv, size_t cb) { | |
| 519 //LOG(LS_INFO) << "OpenSSLAdapter::Send(" << cb << ")"; | |
| 520 | |
| 521 switch (state_) { | |
| 522 case SSL_NONE: | |
| 523 return AsyncSocketAdapter::Send(pv, cb); | |
| 524 | |
| 525 case SSL_WAIT: | |
| 526 case SSL_CONNECTING: | |
| 527 SetError(ENOTCONN); | |
| 528 return SOCKET_ERROR; | |
| 529 | |
| 530 case SSL_CONNECTED: | |
| 531 break; | |
| 532 | |
| 533 case SSL_ERROR: | |
| 534 default: | |
| 535 return SOCKET_ERROR; | |
| 536 } | |
| 537 | |
| 538 int ret; | |
| 539 int error; | |
| 540 | |
| 541 if (!pending_data_.empty()) { | |
| 542 ret = DoSslWrite(pending_data_.data(), pending_data_.size(), &error); | |
| 543 if (ret != static_cast<int>(pending_data_.size())) { | |
| 544 // We couldn't finish sending the pending data, so we definitely can't | |
| 545 // send any more data. Return with an EWOULDBLOCK error. | |
| 546 SetError(EWOULDBLOCK); | |
| 547 return SOCKET_ERROR; | |
| 548 } | |
| 549 // We completed sending the data previously passed into SSL_write! Now | |
| 550 // we're allowed to send more data. | |
| 551 pending_data_.Clear(); | |
| 552 } | |
| 553 | |
| 554 // OpenSSL will return an error if we try to write zero bytes | |
| 555 if (cb == 0) | |
| 556 return 0; | |
| 557 | |
| 558 ret = DoSslWrite(pv, cb, &error); | |
| 559 | |
| 560 // If SSL_write fails with SSL_ERROR_WANT_READ or SSL_ERROR_WANT_WRITE, this | |
| 561 // means the underlying socket is blocked on reading or (more typically) | |
| 562 // writing. When this happens, OpenSSL requires that the next call to | |
| 563 // SSL_write uses the same arguments (though, with | |
| 564 // SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER, the actual buffer pointer may be | |
| 565 // different). | |
| 566 // | |
| 567 // However, after Send exits, we will have lost access to data the user of | |
| 568 // this class is trying to send, and there's no guarantee that the user of | |
| 569 // this class will call Send with the same arguements when it fails. So, we | |
| 570 // buffer the data ourselves. When we know the underlying socket is writable | |
| 571 // again from OnWriteEvent (or if Send is called again before that happens), | |
| 572 // we'll retry sending this buffered data. | |
| 573 if (error == SSL_ERROR_WANT_READ || error == SSL_ERROR_WANT_WRITE) { | |
| 574 // Shouldn't be able to get to this point if we already have pending data. | |
| 575 RTC_DCHECK(pending_data_.empty()); | |
| 576 LOG(LS_WARNING) | |
| 577 << "SSL_write couldn't write to the underlying socket; buffering data."; | |
| 578 pending_data_.SetData(static_cast<const uint8_t*>(pv), cb); | |
| 579 // Since we're taking responsibility for sending this data, return its full | |
| 580 // size. The user of this class can consider it sent. | |
| 581 return cb; | |
| 582 } | |
| 583 | |
| 584 return ret; | |
| 585 } | |
| 586 | |
| 587 int | |
| 588 OpenSSLAdapter::SendTo(const void* pv, size_t cb, const SocketAddress& addr) { | |
| 589 if (socket_->GetState() == Socket::CS_CONNECTED && | |
| 590 addr == socket_->GetRemoteAddress()) { | |
| 591 return Send(pv, cb); | |
| 592 } | |
| 593 | |
| 594 SetError(ENOTCONN); | |
| 595 | |
| 596 return SOCKET_ERROR; | |
| 597 } | |
| 598 | |
| 599 int OpenSSLAdapter::Recv(void* pv, size_t cb, int64_t* timestamp) { | |
| 600 //LOG(LS_INFO) << "OpenSSLAdapter::Recv(" << cb << ")"; | |
| 601 switch (state_) { | |
| 602 | |
| 603 case SSL_NONE: | |
| 604 return AsyncSocketAdapter::Recv(pv, cb, timestamp); | |
| 605 | |
| 606 case SSL_WAIT: | |
| 607 case SSL_CONNECTING: | |
| 608 SetError(ENOTCONN); | |
| 609 return SOCKET_ERROR; | |
| 610 | |
| 611 case SSL_CONNECTED: | |
| 612 break; | |
| 613 | |
| 614 case SSL_ERROR: | |
| 615 default: | |
| 616 return SOCKET_ERROR; | |
| 617 } | |
| 618 | |
| 619 // Don't trust OpenSSL with zero byte reads | |
| 620 if (cb == 0) | |
| 621 return 0; | |
| 622 | |
| 623 ssl_read_needs_write_ = false; | |
| 624 | |
| 625 int code = SSL_read(ssl_, pv, checked_cast<int>(cb)); | |
| 626 int error = SSL_get_error(ssl_, code); | |
| 627 switch (error) { | |
| 628 case SSL_ERROR_NONE: | |
| 629 // LOG(LS_INFO) << " -- success"; | |
| 630 return code; | |
| 631 case SSL_ERROR_WANT_READ: | |
| 632 // LOG(LS_INFO) << " -- error want read"; | |
| 633 SetError(EWOULDBLOCK); | |
| 634 break; | |
| 635 case SSL_ERROR_WANT_WRITE: | |
| 636 // LOG(LS_INFO) << " -- error want write"; | |
| 637 ssl_read_needs_write_ = true; | |
| 638 SetError(EWOULDBLOCK); | |
| 639 break; | |
| 640 case SSL_ERROR_ZERO_RETURN: | |
| 641 // LOG(LS_INFO) << " -- remote side closed"; | |
| 642 SetError(EWOULDBLOCK); | |
| 643 // do we need to signal closure? | |
| 644 break; | |
| 645 case SSL_ERROR_SSL: | |
| 646 LogSslError(); | |
| 647 Error("SSL_read", (code ? code : -1), false); | |
| 648 break; | |
| 649 default: | |
| 650 LOG(LS_WARNING) << "Unknown error from SSL_read: " << error; | |
| 651 Error("SSL_read", (code ? code : -1), false); | |
| 652 break; | |
| 653 } | |
| 654 | |
| 655 return SOCKET_ERROR; | |
| 656 } | |
| 657 | |
| 658 int OpenSSLAdapter::RecvFrom(void* pv, | |
| 659 size_t cb, | |
| 660 SocketAddress* paddr, | |
| 661 int64_t* timestamp) { | |
| 662 if (socket_->GetState() == Socket::CS_CONNECTED) { | |
| 663 int ret = Recv(pv, cb, timestamp); | |
| 664 | |
| 665 *paddr = GetRemoteAddress(); | |
| 666 | |
| 667 return ret; | |
| 668 } | |
| 669 | |
| 670 SetError(ENOTCONN); | |
| 671 | |
| 672 return SOCKET_ERROR; | |
| 673 } | |
| 674 | |
| 675 int | |
| 676 OpenSSLAdapter::Close() { | |
| 677 Cleanup(); | |
| 678 state_ = restartable_ ? SSL_WAIT : SSL_NONE; | |
| 679 return AsyncSocketAdapter::Close(); | |
| 680 } | |
| 681 | |
| 682 Socket::ConnState | |
| 683 OpenSSLAdapter::GetState() const { | |
| 684 //if (signal_close_) | |
| 685 // return CS_CONNECTED; | |
| 686 ConnState state = socket_->GetState(); | |
| 687 if ((state == CS_CONNECTED) | |
| 688 && ((state_ == SSL_WAIT) || (state_ == SSL_CONNECTING))) | |
| 689 state = CS_CONNECTING; | |
| 690 return state; | |
| 691 } | |
| 692 | |
| 693 void | |
| 694 OpenSSLAdapter::OnMessage(Message* msg) { | |
| 695 if (MSG_TIMEOUT == msg->message_id) { | |
| 696 LOG(LS_INFO) << "DTLS timeout expired"; | |
| 697 DTLSv1_handle_timeout(ssl_); | |
| 698 ContinueSSL(); | |
| 699 } | |
| 700 } | |
| 701 | |
| 702 void | |
| 703 OpenSSLAdapter::OnConnectEvent(AsyncSocket* socket) { | |
| 704 LOG(LS_INFO) << "OpenSSLAdapter::OnConnectEvent"; | |
| 705 if (state_ != SSL_WAIT) { | |
| 706 RTC_DCHECK(state_ == SSL_NONE); | |
| 707 AsyncSocketAdapter::OnConnectEvent(socket); | |
| 708 return; | |
| 709 } | |
| 710 | |
| 711 state_ = SSL_CONNECTING; | |
| 712 if (int err = BeginSSL()) { | |
| 713 AsyncSocketAdapter::OnCloseEvent(socket, err); | |
| 714 } | |
| 715 } | |
| 716 | |
| 717 void | |
| 718 OpenSSLAdapter::OnReadEvent(AsyncSocket* socket) { | |
| 719 //LOG(LS_INFO) << "OpenSSLAdapter::OnReadEvent"; | |
| 720 | |
| 721 if (state_ == SSL_NONE) { | |
| 722 AsyncSocketAdapter::OnReadEvent(socket); | |
| 723 return; | |
| 724 } | |
| 725 | |
| 726 if (state_ == SSL_CONNECTING) { | |
| 727 if (int err = ContinueSSL()) { | |
| 728 Error("ContinueSSL", err); | |
| 729 } | |
| 730 return; | |
| 731 } | |
| 732 | |
| 733 if (state_ != SSL_CONNECTED) | |
| 734 return; | |
| 735 | |
| 736 // Don't let ourselves go away during the callbacks | |
| 737 //PRefPtr<OpenSSLAdapter> lock(this); // TODO: fix this | |
| 738 if (ssl_write_needs_read_) { | |
| 739 //LOG(LS_INFO) << " -- onStreamWriteable"; | |
| 740 AsyncSocketAdapter::OnWriteEvent(socket); | |
| 741 } | |
| 742 | |
| 743 //LOG(LS_INFO) << " -- onStreamReadable"; | |
| 744 AsyncSocketAdapter::OnReadEvent(socket); | |
| 745 } | |
| 746 | |
| 747 void | |
| 748 OpenSSLAdapter::OnWriteEvent(AsyncSocket* socket) { | |
| 749 //LOG(LS_INFO) << "OpenSSLAdapter::OnWriteEvent"; | |
| 750 | |
| 751 if (state_ == SSL_NONE) { | |
| 752 AsyncSocketAdapter::OnWriteEvent(socket); | |
| 753 return; | |
| 754 } | |
| 755 | |
| 756 if (state_ == SSL_CONNECTING) { | |
| 757 if (int err = ContinueSSL()) { | |
| 758 Error("ContinueSSL", err); | |
| 759 } | |
| 760 return; | |
| 761 } | |
| 762 | |
| 763 if (state_ != SSL_CONNECTED) | |
| 764 return; | |
| 765 | |
| 766 // Don't let ourselves go away during the callbacks | |
| 767 //PRefPtr<OpenSSLAdapter> lock(this); // TODO: fix this | |
| 768 | |
| 769 if (ssl_read_needs_write_) { | |
| 770 //LOG(LS_INFO) << " -- onStreamReadable"; | |
| 771 AsyncSocketAdapter::OnReadEvent(socket); | |
| 772 } | |
| 773 | |
| 774 // If a previous SSL_write failed due to the underlying socket being blocked, | |
| 775 // this will attempt finishing the write operation. | |
| 776 if (!pending_data_.empty()) { | |
| 777 int error; | |
| 778 if (DoSslWrite(pending_data_.data(), pending_data_.size(), &error) == | |
| 779 static_cast<int>(pending_data_.size())) { | |
| 780 pending_data_.Clear(); | |
| 781 } | |
| 782 } | |
| 783 | |
| 784 //LOG(LS_INFO) << " -- onStreamWriteable"; | |
| 785 AsyncSocketAdapter::OnWriteEvent(socket); | |
| 786 } | |
| 787 | |
| 788 void | |
| 789 OpenSSLAdapter::OnCloseEvent(AsyncSocket* socket, int err) { | |
| 790 LOG(LS_INFO) << "OpenSSLAdapter::OnCloseEvent(" << err << ")"; | |
| 791 AsyncSocketAdapter::OnCloseEvent(socket, err); | |
| 792 } | |
| 793 | |
| 794 bool OpenSSLAdapter::VerifyServerName(SSL* ssl, const char* host, | |
| 795 bool ignore_bad_cert) { | |
| 796 if (!host) | |
| 797 return false; | |
| 798 | |
| 799 // Checking the return from SSL_get_peer_certificate here is not strictly | |
| 800 // necessary. With our setup, it is not possible for it to return | |
| 801 // null. However, it is good form to check the return. | |
| 802 X509* certificate = SSL_get_peer_certificate(ssl); | |
| 803 if (!certificate) | |
| 804 return false; | |
| 805 | |
| 806 // Logging certificates is extremely verbose. So it is disabled by default. | |
| 807 #ifdef LOG_CERTIFICATES | |
| 808 { | |
| 809 LOG(LS_INFO) << "Certificate from server:"; | |
| 810 BIO* mem = BIO_new(BIO_s_mem()); | |
| 811 X509_print_ex(mem, certificate, XN_FLAG_SEP_CPLUS_SPC, X509_FLAG_NO_HEADER); | |
| 812 BIO_write(mem, "\0", 1); | |
| 813 char* buffer; | |
| 814 BIO_get_mem_data(mem, &buffer); | |
| 815 LOG(LS_INFO) << buffer; | |
| 816 BIO_free(mem); | |
| 817 | |
| 818 char* cipher_description = | |
| 819 SSL_CIPHER_description(SSL_get_current_cipher(ssl), nullptr, 128); | |
| 820 LOG(LS_INFO) << "Cipher: " << cipher_description; | |
| 821 OPENSSL_free(cipher_description); | |
| 822 } | |
| 823 #endif | |
| 824 | |
| 825 bool ok = false; | |
| 826 GENERAL_NAMES* names = reinterpret_cast<GENERAL_NAMES*>( | |
| 827 X509_get_ext_d2i(certificate, NID_subject_alt_name, nullptr, nullptr)); | |
| 828 if (names) { | |
| 829 for (size_t i = 0; i < sk_GENERAL_NAME_num(names); i++) { | |
| 830 const GENERAL_NAME* name = sk_GENERAL_NAME_value(names, i); | |
| 831 if (name->type != GEN_DNS) | |
| 832 continue; | |
| 833 std::string value( | |
| 834 reinterpret_cast<const char*>(ASN1_STRING_data(name->d.dNSName)), | |
| 835 ASN1_STRING_length(name->d.dNSName)); | |
| 836 // string_match takes NUL-terminated strings, so check for embedded NULs. | |
| 837 if (value.find('\0') != std::string::npos) | |
| 838 continue; | |
| 839 if (string_match(host, value.c_str())) { | |
| 840 ok = true; | |
| 841 break; | |
| 842 } | |
| 843 } | |
| 844 GENERAL_NAMES_free(names); | |
| 845 } | |
| 846 | |
| 847 char data[256]; | |
| 848 X509_NAME* subject; | |
| 849 if (!ok && ((subject = X509_get_subject_name(certificate)) != nullptr) && | |
| 850 (X509_NAME_get_text_by_NID(subject, NID_commonName, data, sizeof(data)) > | |
| 851 0)) { | |
| 852 data[sizeof(data)-1] = 0; | |
| 853 if (_stricmp(data, host) == 0) | |
| 854 ok = true; | |
| 855 } | |
| 856 | |
| 857 X509_free(certificate); | |
| 858 | |
| 859 // This should only ever be turned on for debugging and development. | |
| 860 if (!ok && ignore_bad_cert) { | |
| 861 LOG(LS_WARNING) << "TLS certificate check FAILED. " | |
| 862 << "Allowing connection anyway."; | |
| 863 ok = true; | |
| 864 } | |
| 865 | |
| 866 return ok; | |
| 867 } | |
| 868 | |
| 869 bool OpenSSLAdapter::SSLPostConnectionCheck(SSL* ssl, const char* host) { | |
| 870 bool ok = VerifyServerName(ssl, host, ignore_bad_cert()); | |
| 871 | |
| 872 if (ok) { | |
| 873 ok = (SSL_get_verify_result(ssl) == X509_V_OK || | |
| 874 custom_verification_succeeded_); | |
| 875 } | |
| 876 | |
| 877 if (!ok && ignore_bad_cert()) { | |
| 878 LOG(LS_INFO) << "Other TLS post connection checks failed."; | |
| 879 ok = true; | |
| 880 } | |
| 881 | |
| 882 return ok; | |
| 883 } | |
| 884 | |
| 885 #if !defined(NDEBUG) | |
| 886 | |
| 887 // We only use this for tracing and so it is only needed in debug mode | |
| 888 | |
| 889 void | |
| 890 OpenSSLAdapter::SSLInfoCallback(const SSL* s, int where, int ret) { | |
| 891 const char* str = "undefined"; | |
| 892 int w = where & ~SSL_ST_MASK; | |
| 893 if (w & SSL_ST_CONNECT) { | |
| 894 str = "SSL_connect"; | |
| 895 } else if (w & SSL_ST_ACCEPT) { | |
| 896 str = "SSL_accept"; | |
| 897 } | |
| 898 if (where & SSL_CB_LOOP) { | |
| 899 LOG(LS_INFO) << str << ":" << SSL_state_string_long(s); | |
| 900 } else if (where & SSL_CB_ALERT) { | |
| 901 str = (where & SSL_CB_READ) ? "read" : "write"; | |
| 902 LOG(LS_INFO) << "SSL3 alert " << str | |
| 903 << ":" << SSL_alert_type_string_long(ret) | |
| 904 << ":" << SSL_alert_desc_string_long(ret); | |
| 905 } else if (where & SSL_CB_EXIT) { | |
| 906 if (ret == 0) { | |
| 907 LOG(LS_INFO) << str << ":failed in " << SSL_state_string_long(s); | |
| 908 } else if (ret < 0) { | |
| 909 LOG(LS_INFO) << str << ":error in " << SSL_state_string_long(s); | |
| 910 } | |
| 911 } | |
| 912 } | |
| 913 | |
| 914 #endif | |
| 915 | |
| 916 int | |
| 917 OpenSSLAdapter::SSLVerifyCallback(int ok, X509_STORE_CTX* store) { | |
| 918 #if !defined(NDEBUG) | |
| 919 if (!ok) { | |
| 920 char data[256]; | |
| 921 X509* cert = X509_STORE_CTX_get_current_cert(store); | |
| 922 int depth = X509_STORE_CTX_get_error_depth(store); | |
| 923 int err = X509_STORE_CTX_get_error(store); | |
| 924 | |
| 925 LOG(LS_INFO) << "Error with certificate at depth: " << depth; | |
| 926 X509_NAME_oneline(X509_get_issuer_name(cert), data, sizeof(data)); | |
| 927 LOG(LS_INFO) << " issuer = " << data; | |
| 928 X509_NAME_oneline(X509_get_subject_name(cert), data, sizeof(data)); | |
| 929 LOG(LS_INFO) << " subject = " << data; | |
| 930 LOG(LS_INFO) << " err = " << err | |
| 931 << ":" << X509_verify_cert_error_string(err); | |
| 932 } | |
| 933 #endif | |
| 934 | |
| 935 // Get our stream pointer from the store | |
| 936 SSL* ssl = reinterpret_cast<SSL*>( | |
| 937 X509_STORE_CTX_get_ex_data(store, | |
| 938 SSL_get_ex_data_X509_STORE_CTX_idx())); | |
| 939 | |
| 940 OpenSSLAdapter* stream = | |
| 941 reinterpret_cast<OpenSSLAdapter*>(SSL_get_app_data(ssl)); | |
| 942 | |
| 943 if (!ok && custom_verify_callback_) { | |
| 944 void* cert = | |
| 945 reinterpret_cast<void*>(X509_STORE_CTX_get_current_cert(store)); | |
| 946 if (custom_verify_callback_(cert)) { | |
| 947 stream->custom_verification_succeeded_ = true; | |
| 948 LOG(LS_INFO) << "validated certificate using custom callback"; | |
| 949 ok = true; | |
| 950 } | |
| 951 } | |
| 952 | |
| 953 // Should only be used for debugging and development. | |
| 954 if (!ok && stream->ignore_bad_cert()) { | |
| 955 LOG(LS_WARNING) << "Ignoring cert error while verifying cert chain"; | |
| 956 ok = 1; | |
| 957 } | |
| 958 | |
| 959 return ok; | |
| 960 } | |
| 961 | |
| 962 bool OpenSSLAdapter::ConfigureTrustedRootCertificates(SSL_CTX* ctx) { | |
| 963 // Add the root cert that we care about to the SSL context | |
| 964 int count_of_added_certs = 0; | |
| 965 for (size_t i = 0; i < arraysize(kSSLCertCertificateList); i++) { | |
| 966 const unsigned char* cert_buffer = kSSLCertCertificateList[i]; | |
| 967 size_t cert_buffer_len = kSSLCertCertificateSizeList[i]; | |
| 968 X509* cert = | |
| 969 d2i_X509(nullptr, &cert_buffer, checked_cast<long>(cert_buffer_len)); | |
| 970 if (cert) { | |
| 971 int return_value = X509_STORE_add_cert(SSL_CTX_get_cert_store(ctx), cert); | |
| 972 if (return_value == 0) { | |
| 973 LOG(LS_WARNING) << "Unable to add certificate."; | |
| 974 } else { | |
| 975 count_of_added_certs++; | |
| 976 } | |
| 977 X509_free(cert); | |
| 978 } | |
| 979 } | |
| 980 return count_of_added_certs > 0; | |
| 981 } | |
| 982 | |
| 983 SSL_CTX* | |
| 984 OpenSSLAdapter::SetupSSLContext() { | |
| 985 // Use (D)TLS 1.2. | |
| 986 // Note: BoringSSL supports a range of versions by setting max/min version | |
| 987 // (Default V1.0 to V1.2). However (D)TLSv1_2_client_method functions used | |
| 988 // below in OpenSSL only support V1.2. | |
| 989 SSL_CTX* ctx = nullptr; | |
| 990 #ifdef OPENSSL_IS_BORINGSSL | |
| 991 ctx = SSL_CTX_new(ssl_mode_ == SSL_MODE_DTLS ? DTLS_method() : TLS_method()); | |
| 992 #else | |
| 993 ctx = SSL_CTX_new(ssl_mode_ == SSL_MODE_DTLS ? DTLSv1_2_client_method() | |
| 994 : TLSv1_2_client_method()); | |
| 995 #endif // OPENSSL_IS_BORINGSSL | |
| 996 if (ctx == nullptr) { | |
| 997 unsigned long error = ERR_get_error(); // NOLINT: type used by OpenSSL. | |
| 998 LOG(LS_WARNING) << "SSL_CTX creation failed: " | |
| 999 << '"' << ERR_reason_error_string(error) << "\" " | |
| 1000 << "(error=" << error << ')'; | |
| 1001 return nullptr; | |
| 1002 } | |
| 1003 if (!ConfigureTrustedRootCertificates(ctx)) { | |
| 1004 SSL_CTX_free(ctx); | |
| 1005 return nullptr; | |
| 1006 } | |
| 1007 | |
| 1008 #if !defined(NDEBUG) | |
| 1009 SSL_CTX_set_info_callback(ctx, SSLInfoCallback); | |
| 1010 #endif | |
| 1011 | |
| 1012 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, SSLVerifyCallback); | |
| 1013 SSL_CTX_set_verify_depth(ctx, 4); | |
| 1014 // Use defaults, but disable HMAC-SHA256 and HMAC-SHA384 ciphers | |
| 1015 // (note that SHA256 and SHA384 only select legacy CBC ciphers). | |
| 1016 // Additionally disable HMAC-SHA1 ciphers in ECDSA. These are the remaining | |
| 1017 // CBC-mode ECDSA ciphers. | |
| 1018 SSL_CTX_set_cipher_list( | |
| 1019 ctx, "ALL:!SHA256:!SHA384:!aPSK:!ECDSA+SHA1:!ADH:!LOW:!EXP:!MD5"); | |
| 1020 | |
| 1021 if (ssl_mode_ == SSL_MODE_DTLS) { | |
| 1022 SSL_CTX_set_read_ahead(ctx, 1); | |
| 1023 } | |
| 1024 | |
| 1025 return ctx; | |
| 1026 } | |
| 1027 | |
| 1028 } // namespace rtc | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 2877023002:
Move webrtc/{base => rtc_base} (Closed)
