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 "webrtc/base/win32.h" |
| 12 | #define SECURITY_WIN32 |
| 13 | #include <security.h> |
| 14 | #include <schannel.h> |
| 15 | |
| 16 | #include <iomanip> |
| 17 | #include <vector> |
| 18 | |
| 19 | #include "webrtc/base/common.h" |
| 20 | #include "webrtc/base/logging.h" |
| 21 | #include "webrtc/base/schanneladapter.h" |
| 22 | #include "webrtc/base/sec_buffer.h" |
| 23 | #include "webrtc/base/thread.h" |
| 24 | |
| 25 | namespace rtc { |
| 26 | |
| 27 | ///////////////////////////////////////////////////////////////////////////// |
| 28 | // SChannelAdapter |
| 29 | ///////////////////////////////////////////////////////////////////////////// |
| 30 | |
| 31 | extern const ConstantLabel SECURITY_ERRORS[]; |
| 32 | |
| 33 | const ConstantLabel SCHANNEL_BUFFER_TYPES[] = { |
| 34 | KLABEL(SECBUFFER_EMPTY), // 0 |
| 35 | KLABEL(SECBUFFER_DATA), // 1 |
| 36 | KLABEL(SECBUFFER_TOKEN), // 2 |
| 37 | KLABEL(SECBUFFER_PKG_PARAMS), // 3 |
| 38 | KLABEL(SECBUFFER_MISSING), // 4 |
| 39 | KLABEL(SECBUFFER_EXTRA), // 5 |
| 40 | KLABEL(SECBUFFER_STREAM_TRAILER), // 6 |
| 41 | KLABEL(SECBUFFER_STREAM_HEADER), // 7 |
| 42 | KLABEL(SECBUFFER_MECHLIST), // 11 |
| 43 | KLABEL(SECBUFFER_MECHLIST_SIGNATURE), // 12 |
| 44 | KLABEL(SECBUFFER_TARGET), // 13 |
| 45 | KLABEL(SECBUFFER_CHANNEL_BINDINGS), // 14 |
| 46 | LASTLABEL |
| 47 | }; |
| 48 | |
| 49 | void DescribeBuffer(LoggingSeverity severity, const char* prefix, |
| 50 | const SecBuffer& sb) { |
| 51 | LOG_V(severity) |
| 52 | << prefix |
| 53 | << "(" << sb.cbBuffer |
| 54 | << ", " << FindLabel(sb.BufferType & ~SECBUFFER_ATTRMASK, |
| 55 | SCHANNEL_BUFFER_TYPES) |
| 56 | << ", " << sb.pvBuffer << ")"; |
| 57 | } |
| 58 | |
| 59 | void DescribeBuffers(LoggingSeverity severity, const char* prefix, |
| 60 | const SecBufferDesc* sbd) { |
| 61 | if (!LOG_CHECK_LEVEL_V(severity)) |
| 62 | return; |
| 63 | LOG_V(severity) << prefix << "("; |
| 64 | for (size_t i=0; i<sbd->cBuffers; ++i) { |
| 65 | DescribeBuffer(severity, " ", sbd->pBuffers[i]); |
| 66 | } |
| 67 | LOG_V(severity) << ")"; |
| 68 | } |
| 69 | |
| 70 | const ULONG SSL_FLAGS_DEFAULT = ISC_REQ_ALLOCATE_MEMORY |
| 71 | | ISC_REQ_CONFIDENTIALITY |
| 72 | | ISC_REQ_EXTENDED_ERROR |
| 73 | | ISC_REQ_INTEGRITY |
| 74 | | ISC_REQ_REPLAY_DETECT |
| 75 | | ISC_REQ_SEQUENCE_DETECT |
| 76 | | ISC_REQ_STREAM; |
| 77 | //| ISC_REQ_USE_SUPPLIED_CREDS; |
| 78 | |
| 79 | typedef std::vector<char> SChannelBuffer; |
| 80 | |
| 81 | struct SChannelAdapter::SSLImpl { |
| 82 | CredHandle cred; |
| 83 | CtxtHandle ctx; |
| 84 | bool cred_init, ctx_init; |
| 85 | SChannelBuffer inbuf, outbuf, readable; |
| 86 | SecPkgContext_StreamSizes sizes; |
| 87 | |
| 88 | SSLImpl() : cred_init(false), ctx_init(false) { } |
| 89 | }; |
| 90 | |
| 91 | SChannelAdapter::SChannelAdapter(AsyncSocket* socket) |
| 92 | : SSLAdapter(socket), state_(SSL_NONE), |
| 93 | restartable_(false), signal_close_(false), message_pending_(false), |
| 94 | impl_(new SSLImpl) { |
| 95 | } |
| 96 | |
| 97 | SChannelAdapter::~SChannelAdapter() { |
| 98 | Cleanup(); |
| 99 | } |
| 100 | |
| 101 | int |
| 102 | SChannelAdapter::StartSSL(const char* hostname, bool restartable) { |
| 103 | if (state_ != SSL_NONE) |
| 104 | return ERROR_ALREADY_INITIALIZED; |
| 105 | |
| 106 | ssl_host_name_ = hostname; |
| 107 | restartable_ = restartable; |
| 108 | |
| 109 | if (socket_->GetState() != Socket::CS_CONNECTED) { |
| 110 | state_ = SSL_WAIT; |
| 111 | return 0; |
| 112 | } |
| 113 | |
| 114 | state_ = SSL_CONNECTING; |
| 115 | if (int err = BeginSSL()) { |
| 116 | Error("BeginSSL", err, false); |
| 117 | return err; |
| 118 | } |
| 119 | |
| 120 | return 0; |
| 121 | } |
| 122 | |
| 123 | int |
| 124 | SChannelAdapter::BeginSSL() { |
| 125 | LOG(LS_VERBOSE) << "BeginSSL: " << ssl_host_name_; |
| 126 | ASSERT(state_ == SSL_CONNECTING); |
| 127 | |
| 128 | SECURITY_STATUS ret; |
| 129 | |
| 130 | SCHANNEL_CRED sc_cred = { 0 }; |
| 131 | sc_cred.dwVersion = SCHANNEL_CRED_VERSION; |
| 132 | //sc_cred.dwMinimumCipherStrength = 128; // Note: use system default |
| 133 | sc_cred.dwFlags = SCH_CRED_NO_DEFAULT_CREDS | SCH_CRED_AUTO_CRED_VALIDATION; |
| 134 | |
sergeyu@chromium.org | b957cd8 | 2014-07-25 19:42:19 +0000 | [diff] [blame] | 135 | ret = AcquireCredentialsHandle(NULL, const_cast<LPTSTR>(UNISP_NAME), |
| 136 | SECPKG_CRED_OUTBOUND, NULL, &sc_cred, NULL, |
| 137 | NULL, &impl_->cred, NULL); |
henrike@webrtc.org | 47be73b | 2014-05-13 18:00:26 +0000 | [diff] [blame] | 138 | if (ret != SEC_E_OK) { |
| 139 | LOG(LS_ERROR) << "AcquireCredentialsHandle error: " |
| 140 | << ErrorName(ret, SECURITY_ERRORS); |
| 141 | return ret; |
| 142 | } |
| 143 | impl_->cred_init = true; |
| 144 | |
| 145 | if (LOG_CHECK_LEVEL(LS_VERBOSE)) { |
| 146 | SecPkgCred_CipherStrengths cipher_strengths = { 0 }; |
| 147 | ret = QueryCredentialsAttributes(&impl_->cred, |
| 148 | SECPKG_ATTR_CIPHER_STRENGTHS, |
| 149 | &cipher_strengths); |
| 150 | if (SUCCEEDED(ret)) { |
| 151 | LOG(LS_VERBOSE) << "SChannel cipher strength: " |
| 152 | << cipher_strengths.dwMinimumCipherStrength << " - " |
| 153 | << cipher_strengths.dwMaximumCipherStrength; |
| 154 | } |
| 155 | |
| 156 | SecPkgCred_SupportedAlgs supported_algs = { 0 }; |
| 157 | ret = QueryCredentialsAttributes(&impl_->cred, |
| 158 | SECPKG_ATTR_SUPPORTED_ALGS, |
| 159 | &supported_algs); |
| 160 | if (SUCCEEDED(ret)) { |
| 161 | LOG(LS_VERBOSE) << "SChannel supported algorithms:"; |
| 162 | for (DWORD i=0; i<supported_algs.cSupportedAlgs; ++i) { |
| 163 | ALG_ID alg_id = supported_algs.palgSupportedAlgs[i]; |
| 164 | PCCRYPT_OID_INFO oinfo = CryptFindOIDInfo(CRYPT_OID_INFO_ALGID_KEY, |
| 165 | &alg_id, 0); |
| 166 | LPCWSTR alg_name = (NULL != oinfo) ? oinfo->pwszName : L"Unknown"; |
| 167 | LOG(LS_VERBOSE) << " " << ToUtf8(alg_name) << " (" << alg_id << ")"; |
| 168 | } |
| 169 | CSecBufferBase::FreeSSPI(supported_algs.palgSupportedAlgs); |
| 170 | } |
| 171 | } |
| 172 | |
| 173 | ULONG flags = SSL_FLAGS_DEFAULT, ret_flags = 0; |
| 174 | if (ignore_bad_cert()) |
| 175 | flags |= ISC_REQ_MANUAL_CRED_VALIDATION; |
| 176 | |
| 177 | CSecBufferBundle<2, CSecBufferBase::FreeSSPI> sb_out; |
| 178 | ret = InitializeSecurityContextA(&impl_->cred, NULL, |
| 179 | const_cast<char*>(ssl_host_name_.c_str()), |
| 180 | flags, 0, 0, NULL, 0, |
| 181 | &impl_->ctx, sb_out.desc(), |
| 182 | &ret_flags, NULL); |
| 183 | if (SUCCEEDED(ret)) |
| 184 | impl_->ctx_init = true; |
| 185 | return ProcessContext(ret, NULL, sb_out.desc()); |
| 186 | } |
| 187 | |
| 188 | int |
| 189 | SChannelAdapter::ContinueSSL() { |
| 190 | LOG(LS_VERBOSE) << "ContinueSSL"; |
| 191 | ASSERT(state_ == SSL_CONNECTING); |
| 192 | |
| 193 | SECURITY_STATUS ret; |
| 194 | |
| 195 | CSecBufferBundle<2> sb_in; |
| 196 | sb_in[0].BufferType = SECBUFFER_TOKEN; |
| 197 | sb_in[0].cbBuffer = static_cast<unsigned long>(impl_->inbuf.size()); |
| 198 | sb_in[0].pvBuffer = &impl_->inbuf[0]; |
| 199 | //DescribeBuffers(LS_VERBOSE, "Input Buffer ", sb_in.desc()); |
| 200 | |
| 201 | ULONG flags = SSL_FLAGS_DEFAULT, ret_flags = 0; |
| 202 | if (ignore_bad_cert()) |
| 203 | flags |= ISC_REQ_MANUAL_CRED_VALIDATION; |
| 204 | |
| 205 | CSecBufferBundle<2, CSecBufferBase::FreeSSPI> sb_out; |
| 206 | ret = InitializeSecurityContextA(&impl_->cred, &impl_->ctx, |
| 207 | const_cast<char*>(ssl_host_name_.c_str()), |
| 208 | flags, 0, 0, sb_in.desc(), 0, |
| 209 | NULL, sb_out.desc(), |
| 210 | &ret_flags, NULL); |
| 211 | return ProcessContext(ret, sb_in.desc(), sb_out.desc()); |
| 212 | } |
| 213 | |
| 214 | int |
| 215 | SChannelAdapter::ProcessContext(long int status, _SecBufferDesc* sbd_in, |
| 216 | _SecBufferDesc* sbd_out) { |
| 217 | if (status != SEC_E_OK && status != SEC_I_CONTINUE_NEEDED && |
| 218 | status != SEC_E_INCOMPLETE_MESSAGE) { |
| 219 | LOG(LS_ERROR) |
| 220 | << "InitializeSecurityContext error: " |
| 221 | << ErrorName(status, SECURITY_ERRORS); |
| 222 | } |
| 223 | //if (sbd_in) |
| 224 | // DescribeBuffers(LS_VERBOSE, "Input Buffer ", sbd_in); |
| 225 | //if (sbd_out) |
| 226 | // DescribeBuffers(LS_VERBOSE, "Output Buffer ", sbd_out); |
| 227 | |
| 228 | if (status == SEC_E_INCOMPLETE_MESSAGE) { |
| 229 | // Wait for more input from server. |
| 230 | return Flush(); |
| 231 | } |
| 232 | |
| 233 | if (FAILED(status)) { |
| 234 | // We can't continue. Common errors: |
| 235 | // SEC_E_CERT_EXPIRED - Typically, this means the computer clock is wrong. |
| 236 | return status; |
| 237 | } |
| 238 | |
| 239 | // Note: we check both input and output buffers for SECBUFFER_EXTRA. |
| 240 | // Experience shows it appearing in the input, but the documentation claims |
| 241 | // it should appear in the output. |
| 242 | size_t extra = 0; |
| 243 | if (sbd_in) { |
| 244 | for (size_t i=0; i<sbd_in->cBuffers; ++i) { |
| 245 | SecBuffer& buffer = sbd_in->pBuffers[i]; |
| 246 | if (buffer.BufferType == SECBUFFER_EXTRA) { |
| 247 | extra += buffer.cbBuffer; |
| 248 | } |
| 249 | } |
| 250 | } |
| 251 | if (sbd_out) { |
| 252 | for (size_t i=0; i<sbd_out->cBuffers; ++i) { |
| 253 | SecBuffer& buffer = sbd_out->pBuffers[i]; |
| 254 | if (buffer.BufferType == SECBUFFER_EXTRA) { |
| 255 | extra += buffer.cbBuffer; |
| 256 | } else if (buffer.BufferType == SECBUFFER_TOKEN) { |
| 257 | impl_->outbuf.insert(impl_->outbuf.end(), |
| 258 | reinterpret_cast<char*>(buffer.pvBuffer), |
| 259 | reinterpret_cast<char*>(buffer.pvBuffer) + buffer.cbBuffer); |
| 260 | } |
| 261 | } |
| 262 | } |
| 263 | |
| 264 | if (extra) { |
| 265 | ASSERT(extra <= impl_->inbuf.size()); |
| 266 | size_t consumed = impl_->inbuf.size() - extra; |
| 267 | memmove(&impl_->inbuf[0], &impl_->inbuf[consumed], extra); |
| 268 | impl_->inbuf.resize(extra); |
| 269 | } else { |
| 270 | impl_->inbuf.clear(); |
| 271 | } |
| 272 | |
| 273 | if (SEC_I_CONTINUE_NEEDED == status) { |
| 274 | // Send data to server and wait for response. |
| 275 | // Note: ContinueSSL will result in a Flush, anyway. |
| 276 | return impl_->inbuf.empty() ? Flush() : ContinueSSL(); |
| 277 | } |
| 278 | |
| 279 | if (SEC_E_OK == status) { |
| 280 | LOG(LS_VERBOSE) << "QueryContextAttributes"; |
| 281 | status = QueryContextAttributes(&impl_->ctx, SECPKG_ATTR_STREAM_SIZES, |
| 282 | &impl_->sizes); |
| 283 | if (FAILED(status)) { |
| 284 | LOG(LS_ERROR) << "QueryContextAttributes error: " |
| 285 | << ErrorName(status, SECURITY_ERRORS); |
| 286 | return status; |
| 287 | } |
| 288 | |
| 289 | state_ = SSL_CONNECTED; |
| 290 | |
| 291 | if (int err = DecryptData()) { |
| 292 | return err; |
| 293 | } else if (int err = Flush()) { |
| 294 | return err; |
| 295 | } else { |
| 296 | // If we decrypted any data, queue up a notification here |
| 297 | PostEvent(); |
| 298 | // Signal our connectedness |
| 299 | AsyncSocketAdapter::OnConnectEvent(this); |
| 300 | } |
| 301 | return 0; |
| 302 | } |
| 303 | |
| 304 | if (SEC_I_INCOMPLETE_CREDENTIALS == status) { |
| 305 | // We don't support client authentication in schannel. |
| 306 | return status; |
| 307 | } |
| 308 | |
| 309 | // We don't expect any other codes |
| 310 | ASSERT(false); |
| 311 | return status; |
| 312 | } |
| 313 | |
| 314 | int |
| 315 | SChannelAdapter::DecryptData() { |
| 316 | SChannelBuffer& inbuf = impl_->inbuf; |
| 317 | SChannelBuffer& readable = impl_->readable; |
| 318 | |
| 319 | while (!inbuf.empty()) { |
| 320 | CSecBufferBundle<4> in_buf; |
| 321 | in_buf[0].BufferType = SECBUFFER_DATA; |
| 322 | in_buf[0].cbBuffer = static_cast<unsigned long>(inbuf.size()); |
| 323 | in_buf[0].pvBuffer = &inbuf[0]; |
| 324 | |
| 325 | //DescribeBuffers(LS_VERBOSE, "Decrypt In ", in_buf.desc()); |
| 326 | SECURITY_STATUS status = DecryptMessage(&impl_->ctx, in_buf.desc(), 0, 0); |
| 327 | //DescribeBuffers(LS_VERBOSE, "Decrypt Out ", in_buf.desc()); |
| 328 | |
| 329 | // Note: We are explicitly treating SEC_E_OK, SEC_I_CONTEXT_EXPIRED, and |
| 330 | // any other successful results as continue. |
| 331 | if (SUCCEEDED(status)) { |
| 332 | size_t data_len = 0, extra_len = 0; |
| 333 | for (size_t i=0; i<in_buf.desc()->cBuffers; ++i) { |
| 334 | if (in_buf[i].BufferType == SECBUFFER_DATA) { |
| 335 | data_len += in_buf[i].cbBuffer; |
| 336 | readable.insert(readable.end(), |
| 337 | reinterpret_cast<char*>(in_buf[i].pvBuffer), |
| 338 | reinterpret_cast<char*>(in_buf[i].pvBuffer) + in_buf[i].cbBuffer); |
| 339 | } else if (in_buf[i].BufferType == SECBUFFER_EXTRA) { |
| 340 | extra_len += in_buf[i].cbBuffer; |
| 341 | } |
| 342 | } |
| 343 | // There is a bug on Win2K where SEC_I_CONTEXT_EXPIRED is misclassified. |
| 344 | if ((data_len == 0) && (inbuf[0] == 0x15)) { |
| 345 | status = SEC_I_CONTEXT_EXPIRED; |
| 346 | } |
| 347 | if (extra_len) { |
| 348 | size_t consumed = inbuf.size() - extra_len; |
| 349 | memmove(&inbuf[0], &inbuf[consumed], extra_len); |
| 350 | inbuf.resize(extra_len); |
| 351 | } else { |
| 352 | inbuf.clear(); |
| 353 | } |
| 354 | // TODO: Handle SEC_I_CONTEXT_EXPIRED to do clean shutdown |
| 355 | if (status != SEC_E_OK) { |
| 356 | LOG(LS_INFO) << "DecryptMessage returned continuation code: " |
| 357 | << ErrorName(status, SECURITY_ERRORS); |
| 358 | } |
| 359 | continue; |
| 360 | } |
| 361 | |
| 362 | if (status == SEC_E_INCOMPLETE_MESSAGE) { |
| 363 | break; |
| 364 | } else { |
| 365 | return status; |
| 366 | } |
| 367 | } |
| 368 | |
| 369 | return 0; |
| 370 | } |
| 371 | |
| 372 | void |
| 373 | SChannelAdapter::Cleanup() { |
| 374 | if (impl_->ctx_init) |
| 375 | DeleteSecurityContext(&impl_->ctx); |
| 376 | if (impl_->cred_init) |
| 377 | FreeCredentialsHandle(&impl_->cred); |
| 378 | delete impl_; |
| 379 | } |
| 380 | |
| 381 | void |
| 382 | SChannelAdapter::PostEvent() { |
| 383 | // Check if there's anything notable to signal |
| 384 | if (impl_->readable.empty() && !signal_close_) |
| 385 | return; |
| 386 | |
| 387 | // Only one post in the queue at a time |
| 388 | if (message_pending_) |
| 389 | return; |
| 390 | |
| 391 | if (Thread* thread = Thread::Current()) { |
| 392 | message_pending_ = true; |
| 393 | thread->Post(this); |
| 394 | } else { |
| 395 | LOG(LS_ERROR) << "No thread context available for SChannelAdapter"; |
| 396 | ASSERT(false); |
| 397 | } |
| 398 | } |
| 399 | |
| 400 | void |
| 401 | SChannelAdapter::Error(const char* context, int err, bool signal) { |
| 402 | LOG(LS_WARNING) << "SChannelAdapter::Error(" |
| 403 | << context << ", " |
| 404 | << ErrorName(err, SECURITY_ERRORS) << ")"; |
| 405 | state_ = SSL_ERROR; |
| 406 | SetError(err); |
| 407 | if (signal) |
| 408 | AsyncSocketAdapter::OnCloseEvent(this, err); |
| 409 | } |
| 410 | |
| 411 | int |
| 412 | SChannelAdapter::Read() { |
| 413 | char buffer[4096]; |
| 414 | SChannelBuffer& inbuf = impl_->inbuf; |
| 415 | while (true) { |
| 416 | int ret = AsyncSocketAdapter::Recv(buffer, sizeof(buffer)); |
| 417 | if (ret > 0) { |
| 418 | inbuf.insert(inbuf.end(), buffer, buffer + ret); |
| 419 | } else if (GetError() == EWOULDBLOCK) { |
| 420 | return 0; // Blocking |
| 421 | } else { |
| 422 | return GetError(); |
| 423 | } |
| 424 | } |
| 425 | } |
| 426 | |
| 427 | int |
| 428 | SChannelAdapter::Flush() { |
| 429 | int result = 0; |
| 430 | size_t pos = 0; |
| 431 | SChannelBuffer& outbuf = impl_->outbuf; |
| 432 | while (pos < outbuf.size()) { |
| 433 | int sent = AsyncSocketAdapter::Send(&outbuf[pos], outbuf.size() - pos); |
| 434 | if (sent > 0) { |
| 435 | pos += sent; |
| 436 | } else if (GetError() == EWOULDBLOCK) { |
| 437 | break; // Blocking |
| 438 | } else { |
| 439 | result = GetError(); |
| 440 | break; |
| 441 | } |
| 442 | } |
| 443 | if (int remainder = static_cast<int>(outbuf.size() - pos)) { |
| 444 | memmove(&outbuf[0], &outbuf[pos], remainder); |
| 445 | outbuf.resize(remainder); |
| 446 | } else { |
| 447 | outbuf.clear(); |
| 448 | } |
| 449 | return result; |
| 450 | } |
| 451 | |
| 452 | // |
| 453 | // AsyncSocket Implementation |
| 454 | // |
| 455 | |
| 456 | int |
| 457 | SChannelAdapter::Send(const void* pv, size_t cb) { |
| 458 | switch (state_) { |
| 459 | case SSL_NONE: |
| 460 | return AsyncSocketAdapter::Send(pv, cb); |
| 461 | |
| 462 | case SSL_WAIT: |
| 463 | case SSL_CONNECTING: |
| 464 | SetError(EWOULDBLOCK); |
| 465 | return SOCKET_ERROR; |
| 466 | |
| 467 | case SSL_CONNECTED: |
| 468 | break; |
| 469 | |
| 470 | case SSL_ERROR: |
| 471 | default: |
| 472 | return SOCKET_ERROR; |
| 473 | } |
| 474 | |
| 475 | size_t written = 0; |
| 476 | SChannelBuffer& outbuf = impl_->outbuf; |
| 477 | while (written < cb) { |
| 478 | const size_t encrypt_len = std::min<size_t>(cb - written, |
| 479 | impl_->sizes.cbMaximumMessage); |
| 480 | |
| 481 | CSecBufferBundle<4> out_buf; |
| 482 | out_buf[0].BufferType = SECBUFFER_STREAM_HEADER; |
| 483 | out_buf[0].cbBuffer = impl_->sizes.cbHeader; |
| 484 | out_buf[1].BufferType = SECBUFFER_DATA; |
| 485 | out_buf[1].cbBuffer = static_cast<unsigned long>(encrypt_len); |
| 486 | out_buf[2].BufferType = SECBUFFER_STREAM_TRAILER; |
| 487 | out_buf[2].cbBuffer = impl_->sizes.cbTrailer; |
| 488 | |
| 489 | size_t packet_len = out_buf[0].cbBuffer |
| 490 | + out_buf[1].cbBuffer |
| 491 | + out_buf[2].cbBuffer; |
| 492 | |
| 493 | SChannelBuffer message; |
| 494 | message.resize(packet_len); |
| 495 | out_buf[0].pvBuffer = &message[0]; |
| 496 | out_buf[1].pvBuffer = &message[out_buf[0].cbBuffer]; |
| 497 | out_buf[2].pvBuffer = &message[out_buf[0].cbBuffer + out_buf[1].cbBuffer]; |
| 498 | |
| 499 | memcpy(out_buf[1].pvBuffer, |
| 500 | static_cast<const char*>(pv) + written, |
| 501 | encrypt_len); |
| 502 | |
| 503 | //DescribeBuffers(LS_VERBOSE, "Encrypt In ", out_buf.desc()); |
| 504 | SECURITY_STATUS res = EncryptMessage(&impl_->ctx, 0, out_buf.desc(), 0); |
| 505 | //DescribeBuffers(LS_VERBOSE, "Encrypt Out ", out_buf.desc()); |
| 506 | |
| 507 | if (FAILED(res)) { |
| 508 | Error("EncryptMessage", res, false); |
| 509 | return SOCKET_ERROR; |
| 510 | } |
| 511 | |
| 512 | // We assume that the header and data segments do not change length, |
| 513 | // or else encrypting the concatenated packet in-place is wrong. |
| 514 | ASSERT(out_buf[0].cbBuffer == impl_->sizes.cbHeader); |
| 515 | ASSERT(out_buf[1].cbBuffer == static_cast<unsigned long>(encrypt_len)); |
| 516 | |
| 517 | // However, the length of the trailer may change due to padding. |
| 518 | ASSERT(out_buf[2].cbBuffer <= impl_->sizes.cbTrailer); |
| 519 | |
| 520 | packet_len = out_buf[0].cbBuffer |
| 521 | + out_buf[1].cbBuffer |
| 522 | + out_buf[2].cbBuffer; |
| 523 | |
| 524 | written += encrypt_len; |
| 525 | outbuf.insert(outbuf.end(), &message[0], &message[packet_len-1]+1); |
| 526 | } |
| 527 | |
| 528 | if (int err = Flush()) { |
| 529 | state_ = SSL_ERROR; |
| 530 | SetError(err); |
| 531 | return SOCKET_ERROR; |
| 532 | } |
| 533 | |
| 534 | return static_cast<int>(written); |
| 535 | } |
| 536 | |
| 537 | int |
| 538 | SChannelAdapter::Recv(void* pv, size_t cb) { |
| 539 | switch (state_) { |
| 540 | case SSL_NONE: |
| 541 | return AsyncSocketAdapter::Recv(pv, cb); |
| 542 | |
| 543 | case SSL_WAIT: |
| 544 | case SSL_CONNECTING: |
| 545 | SetError(EWOULDBLOCK); |
| 546 | return SOCKET_ERROR; |
| 547 | |
| 548 | case SSL_CONNECTED: |
| 549 | break; |
| 550 | |
| 551 | case SSL_ERROR: |
| 552 | default: |
| 553 | return SOCKET_ERROR; |
| 554 | } |
| 555 | |
| 556 | SChannelBuffer& readable = impl_->readable; |
| 557 | if (readable.empty()) { |
| 558 | SetError(EWOULDBLOCK); |
| 559 | return SOCKET_ERROR; |
| 560 | } |
| 561 | size_t read = _min(cb, readable.size()); |
| 562 | memcpy(pv, &readable[0], read); |
| 563 | if (size_t remaining = readable.size() - read) { |
| 564 | memmove(&readable[0], &readable[read], remaining); |
| 565 | readable.resize(remaining); |
| 566 | } else { |
| 567 | readable.clear(); |
| 568 | } |
| 569 | |
| 570 | PostEvent(); |
| 571 | return static_cast<int>(read); |
| 572 | } |
| 573 | |
| 574 | int |
| 575 | SChannelAdapter::Close() { |
| 576 | if (!impl_->readable.empty()) { |
| 577 | LOG(WARNING) << "SChannelAdapter::Close with readable data"; |
| 578 | // Note: this isn't strictly an error, but we're using it temporarily to |
| 579 | // track bugs. |
| 580 | //ASSERT(false); |
| 581 | } |
| 582 | if (state_ == SSL_CONNECTED) { |
| 583 | DWORD token = SCHANNEL_SHUTDOWN; |
| 584 | CSecBufferBundle<1> sb_in; |
| 585 | sb_in[0].BufferType = SECBUFFER_TOKEN; |
| 586 | sb_in[0].cbBuffer = sizeof(token); |
| 587 | sb_in[0].pvBuffer = &token; |
| 588 | ApplyControlToken(&impl_->ctx, sb_in.desc()); |
| 589 | // TODO: In theory, to do a nice shutdown, we need to begin shutdown |
| 590 | // negotiation with more calls to InitializeSecurityContext. Since the |
| 591 | // socket api doesn't support nice shutdown at this point, we don't bother. |
| 592 | } |
| 593 | Cleanup(); |
| 594 | impl_ = new SSLImpl; |
| 595 | state_ = restartable_ ? SSL_WAIT : SSL_NONE; |
| 596 | signal_close_ = false; |
| 597 | message_pending_ = false; |
| 598 | return AsyncSocketAdapter::Close(); |
| 599 | } |
| 600 | |
| 601 | Socket::ConnState |
| 602 | SChannelAdapter::GetState() const { |
| 603 | if (signal_close_) |
| 604 | return CS_CONNECTED; |
| 605 | ConnState state = socket_->GetState(); |
| 606 | if ((state == CS_CONNECTED) |
| 607 | && ((state_ == SSL_WAIT) || (state_ == SSL_CONNECTING))) |
| 608 | state = CS_CONNECTING; |
| 609 | return state; |
| 610 | } |
| 611 | |
| 612 | void |
| 613 | SChannelAdapter::OnConnectEvent(AsyncSocket* socket) { |
| 614 | LOG(LS_VERBOSE) << "SChannelAdapter::OnConnectEvent"; |
| 615 | if (state_ != SSL_WAIT) { |
| 616 | ASSERT(state_ == SSL_NONE); |
| 617 | AsyncSocketAdapter::OnConnectEvent(socket); |
| 618 | return; |
| 619 | } |
| 620 | |
| 621 | state_ = SSL_CONNECTING; |
| 622 | if (int err = BeginSSL()) { |
| 623 | Error("BeginSSL", err); |
| 624 | } |
| 625 | } |
| 626 | |
| 627 | void |
| 628 | SChannelAdapter::OnReadEvent(AsyncSocket* socket) { |
| 629 | if (state_ == SSL_NONE) { |
| 630 | AsyncSocketAdapter::OnReadEvent(socket); |
| 631 | return; |
| 632 | } |
| 633 | |
| 634 | if (int err = Read()) { |
| 635 | Error("Read", err); |
| 636 | return; |
| 637 | } |
| 638 | |
| 639 | if (impl_->inbuf.empty()) |
| 640 | return; |
| 641 | |
| 642 | if (state_ == SSL_CONNECTED) { |
| 643 | if (int err = DecryptData()) { |
| 644 | Error("DecryptData", err); |
| 645 | } else if (!impl_->readable.empty()) { |
| 646 | AsyncSocketAdapter::OnReadEvent(this); |
| 647 | } |
| 648 | } else if (state_ == SSL_CONNECTING) { |
| 649 | if (int err = ContinueSSL()) { |
| 650 | Error("ContinueSSL", err); |
| 651 | } |
| 652 | } |
| 653 | } |
| 654 | |
| 655 | void |
| 656 | SChannelAdapter::OnWriteEvent(AsyncSocket* socket) { |
| 657 | if (state_ == SSL_NONE) { |
| 658 | AsyncSocketAdapter::OnWriteEvent(socket); |
| 659 | return; |
| 660 | } |
| 661 | |
| 662 | if (int err = Flush()) { |
| 663 | Error("Flush", err); |
| 664 | return; |
| 665 | } |
| 666 | |
| 667 | // See if we have more data to write |
| 668 | if (!impl_->outbuf.empty()) |
| 669 | return; |
| 670 | |
| 671 | // Buffer is empty, submit notification |
| 672 | if (state_ == SSL_CONNECTED) { |
| 673 | AsyncSocketAdapter::OnWriteEvent(socket); |
| 674 | } |
| 675 | } |
| 676 | |
| 677 | void |
| 678 | SChannelAdapter::OnCloseEvent(AsyncSocket* socket, int err) { |
| 679 | if ((state_ == SSL_NONE) || impl_->readable.empty()) { |
| 680 | AsyncSocketAdapter::OnCloseEvent(socket, err); |
| 681 | return; |
| 682 | } |
| 683 | |
| 684 | // If readable is non-empty, then we have a pending Message |
| 685 | // that will allow us to signal close (eventually). |
| 686 | signal_close_ = true; |
| 687 | } |
| 688 | |
| 689 | void |
| 690 | SChannelAdapter::OnMessage(Message* pmsg) { |
| 691 | if (!message_pending_) |
| 692 | return; // This occurs when socket is closed |
| 693 | |
| 694 | message_pending_ = false; |
| 695 | if (!impl_->readable.empty()) { |
| 696 | AsyncSocketAdapter::OnReadEvent(this); |
| 697 | } else if (signal_close_) { |
| 698 | signal_close_ = false; |
| 699 | AsyncSocketAdapter::OnCloseEvent(this, 0); // TODO: cache this error? |
| 700 | } |
| 701 | } |
| 702 | |
| 703 | } // namespace rtc |