http_network_transaction.cc revision ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16
1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "net/http/http_network_transaction.h"
6
7#include <set>
8#include <vector>
9
10#include "base/bind.h"
11#include "base/bind_helpers.h"
12#include "base/compiler_specific.h"
13#include "base/format_macros.h"
14#include "base/memory/scoped_ptr.h"
15#include "base/metrics/field_trial.h"
16#include "base/metrics/histogram.h"
17#include "base/metrics/stats_counters.h"
18#include "base/stl_util.h"
19#include "base/strings/string_number_conversions.h"
20#include "base/strings/string_util.h"
21#include "base/strings/stringprintf.h"
22#include "base/values.h"
23#include "build/build_config.h"
24#include "net/base/auth.h"
25#include "net/base/host_port_pair.h"
26#include "net/base/io_buffer.h"
27#include "net/base/load_flags.h"
28#include "net/base/load_timing_info.h"
29#include "net/base/net_errors.h"
30#include "net/base/net_util.h"
31#include "net/base/upload_data_stream.h"
32#include "net/http/http_auth.h"
33#include "net/http/http_auth_handler.h"
34#include "net/http/http_auth_handler_factory.h"
35#include "net/http/http_basic_stream.h"
36#include "net/http/http_chunked_decoder.h"
37#include "net/http/http_network_session.h"
38#include "net/http/http_proxy_client_socket.h"
39#include "net/http/http_proxy_client_socket_pool.h"
40#include "net/http/http_request_headers.h"
41#include "net/http/http_request_info.h"
42#include "net/http/http_response_headers.h"
43#include "net/http/http_response_info.h"
44#include "net/http/http_server_properties.h"
45#include "net/http/http_status_code.h"
46#include "net/http/http_stream_base.h"
47#include "net/http/http_stream_factory.h"
48#include "net/http/http_util.h"
49#include "net/http/transport_security_state.h"
50#include "net/http/url_security_manager.h"
51#include "net/socket/client_socket_factory.h"
52#include "net/socket/socks_client_socket_pool.h"
53#include "net/socket/ssl_client_socket.h"
54#include "net/socket/ssl_client_socket_pool.h"
55#include "net/socket/transport_client_socket_pool.h"
56#include "net/spdy/spdy_http_stream.h"
57#include "net/spdy/spdy_session.h"
58#include "net/spdy/spdy_session_pool.h"
59#include "net/ssl/ssl_cert_request_info.h"
60#include "net/ssl/ssl_connection_status_flags.h"
61#include "url/gurl.h"
62
63using base::Time;
64
65namespace net {
66
67namespace {
68
69void ProcessAlternateProtocol(
70    HttpStreamFactory* factory,
71    const base::WeakPtr<HttpServerProperties>& http_server_properties,
72    const HttpResponseHeaders& headers,
73    const HostPortPair& http_host_port_pair) {
74  std::string alternate_protocol_str;
75
76  if (!headers.EnumerateHeader(NULL, kAlternateProtocolHeader,
77                               &alternate_protocol_str)) {
78    // Header is not present.
79    return;
80  }
81
82  factory->ProcessAlternateProtocol(http_server_properties,
83                                    alternate_protocol_str,
84                                    http_host_port_pair);
85}
86
87// Returns true if |error| is a client certificate authentication error.
88bool IsClientCertificateError(int error) {
89  switch (error) {
90    case ERR_BAD_SSL_CLIENT_AUTH_CERT:
91    case ERR_SSL_CLIENT_AUTH_PRIVATE_KEY_ACCESS_DENIED:
92    case ERR_SSL_CLIENT_AUTH_CERT_NO_PRIVATE_KEY:
93    case ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED:
94      return true;
95    default:
96      return false;
97  }
98}
99
100base::Value* NetLogSSLVersionFallbackCallback(
101    const GURL* url,
102    int net_error,
103    uint16 version_before,
104    uint16 version_after,
105    NetLog::LogLevel /* log_level */) {
106  base::DictionaryValue* dict = new base::DictionaryValue();
107  dict->SetString("host_and_port", GetHostAndPort(*url));
108  dict->SetInteger("net_error", net_error);
109  dict->SetInteger("version_before", version_before);
110  dict->SetInteger("version_after", version_after);
111  return dict;
112}
113
114}  // namespace
115
116//-----------------------------------------------------------------------------
117
118HttpNetworkTransaction::HttpNetworkTransaction(RequestPriority priority,
119                                               HttpNetworkSession* session)
120    : pending_auth_target_(HttpAuth::AUTH_NONE),
121      io_callback_(base::Bind(&HttpNetworkTransaction::OnIOComplete,
122                              base::Unretained(this))),
123      session_(session),
124      request_(NULL),
125      priority_(priority),
126      headers_valid_(false),
127      logged_response_time_(false),
128      request_headers_(),
129      read_buf_len_(0),
130      next_state_(STATE_NONE),
131      establishing_tunnel_(false) {
132  session->ssl_config_service()->GetSSLConfig(&server_ssl_config_);
133  if (session->http_stream_factory()->has_next_protos()) {
134    server_ssl_config_.next_protos =
135        session->http_stream_factory()->next_protos();
136  }
137  proxy_ssl_config_ = server_ssl_config_;
138}
139
140HttpNetworkTransaction::~HttpNetworkTransaction() {
141  if (stream_.get()) {
142    HttpResponseHeaders* headers = GetResponseHeaders();
143    // TODO(mbelshe): The stream_ should be able to compute whether or not the
144    //                stream should be kept alive.  No reason to compute here
145    //                and pass it in.
146    bool try_to_keep_alive =
147        next_state_ == STATE_NONE &&
148        stream_->CanFindEndOfResponse() &&
149        (!headers || headers->IsKeepAlive());
150    if (!try_to_keep_alive) {
151      stream_->Close(true /* not reusable */);
152    } else {
153      if (stream_->IsResponseBodyComplete()) {
154        // If the response body is complete, we can just reuse the socket.
155        stream_->Close(false /* reusable */);
156      } else if (stream_->IsSpdyHttpStream()) {
157        // Doesn't really matter for SpdyHttpStream. Just close it.
158        stream_->Close(true /* not reusable */);
159      } else {
160        // Otherwise, we try to drain the response body.
161        HttpStreamBase* stream = stream_.release();
162        stream->Drain(session_.get());
163      }
164    }
165  }
166}
167
168int HttpNetworkTransaction::Start(const HttpRequestInfo* request_info,
169                                  const CompletionCallback& callback,
170                                  const BoundNetLog& net_log) {
171  SIMPLE_STATS_COUNTER("HttpNetworkTransaction.Count");
172
173  net_log_ = net_log;
174  request_ = request_info;
175  start_time_ = base::Time::Now();
176
177  if (request_->load_flags & LOAD_DISABLE_CERT_REVOCATION_CHECKING) {
178    server_ssl_config_.rev_checking_enabled = false;
179    proxy_ssl_config_.rev_checking_enabled = false;
180  }
181
182  // Channel ID is enabled unless --disable-tls-channel-id flag is set,
183  // or if privacy mode is enabled.
184  bool channel_id_enabled = server_ssl_config_.channel_id_enabled &&
185      (request_->privacy_mode == kPrivacyModeDisabled);
186  server_ssl_config_.channel_id_enabled = channel_id_enabled;
187
188  next_state_ = STATE_CREATE_STREAM;
189  int rv = DoLoop(OK);
190  if (rv == ERR_IO_PENDING)
191    callback_ = callback;
192  return rv;
193}
194
195int HttpNetworkTransaction::RestartIgnoringLastError(
196    const CompletionCallback& callback) {
197  DCHECK(!stream_.get());
198  DCHECK(!stream_request_.get());
199  DCHECK_EQ(STATE_NONE, next_state_);
200
201  next_state_ = STATE_CREATE_STREAM;
202
203  int rv = DoLoop(OK);
204  if (rv == ERR_IO_PENDING)
205    callback_ = callback;
206  return rv;
207}
208
209int HttpNetworkTransaction::RestartWithCertificate(
210    X509Certificate* client_cert, const CompletionCallback& callback) {
211  // In HandleCertificateRequest(), we always tear down existing stream
212  // requests to force a new connection.  So we shouldn't have one here.
213  DCHECK(!stream_request_.get());
214  DCHECK(!stream_.get());
215  DCHECK_EQ(STATE_NONE, next_state_);
216
217  SSLConfig* ssl_config = response_.cert_request_info->is_proxy ?
218      &proxy_ssl_config_ : &server_ssl_config_;
219  ssl_config->send_client_cert = true;
220  ssl_config->client_cert = client_cert;
221  session_->ssl_client_auth_cache()->Add(
222      response_.cert_request_info->host_and_port, client_cert);
223  // Reset the other member variables.
224  // Note: this is necessary only with SSL renegotiation.
225  ResetStateForRestart();
226  next_state_ = STATE_CREATE_STREAM;
227  int rv = DoLoop(OK);
228  if (rv == ERR_IO_PENDING)
229    callback_ = callback;
230  return rv;
231}
232
233int HttpNetworkTransaction::RestartWithAuth(
234    const AuthCredentials& credentials, const CompletionCallback& callback) {
235  HttpAuth::Target target = pending_auth_target_;
236  if (target == HttpAuth::AUTH_NONE) {
237    NOTREACHED();
238    return ERR_UNEXPECTED;
239  }
240  pending_auth_target_ = HttpAuth::AUTH_NONE;
241
242  auth_controllers_[target]->ResetAuth(credentials);
243
244  DCHECK(callback_.is_null());
245
246  int rv = OK;
247  if (target == HttpAuth::AUTH_PROXY && establishing_tunnel_) {
248    // In this case, we've gathered credentials for use with proxy
249    // authentication of a tunnel.
250    DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
251    DCHECK(stream_request_ != NULL);
252    auth_controllers_[target] = NULL;
253    ResetStateForRestart();
254    rv = stream_request_->RestartTunnelWithProxyAuth(credentials);
255  } else {
256    // In this case, we've gathered credentials for the server or the proxy
257    // but it is not during the tunneling phase.
258    DCHECK(stream_request_ == NULL);
259    PrepareForAuthRestart(target);
260    rv = DoLoop(OK);
261  }
262
263  if (rv == ERR_IO_PENDING)
264    callback_ = callback;
265  return rv;
266}
267
268void HttpNetworkTransaction::PrepareForAuthRestart(HttpAuth::Target target) {
269  DCHECK(HaveAuth(target));
270  DCHECK(!stream_request_.get());
271
272  bool keep_alive = false;
273  // Even if the server says the connection is keep-alive, we have to be
274  // able to find the end of each response in order to reuse the connection.
275  if (GetResponseHeaders()->IsKeepAlive() &&
276      stream_->CanFindEndOfResponse()) {
277    // If the response body hasn't been completely read, we need to drain
278    // it first.
279    if (!stream_->IsResponseBodyComplete()) {
280      next_state_ = STATE_DRAIN_BODY_FOR_AUTH_RESTART;
281      read_buf_ = new IOBuffer(kDrainBodyBufferSize);  // A bit bucket.
282      read_buf_len_ = kDrainBodyBufferSize;
283      return;
284    }
285    keep_alive = true;
286  }
287
288  // We don't need to drain the response body, so we act as if we had drained
289  // the response body.
290  DidDrainBodyForAuthRestart(keep_alive);
291}
292
293void HttpNetworkTransaction::DidDrainBodyForAuthRestart(bool keep_alive) {
294  DCHECK(!stream_request_.get());
295
296  if (stream_.get()) {
297    HttpStream* new_stream = NULL;
298    if (keep_alive && stream_->IsConnectionReusable()) {
299      // We should call connection_->set_idle_time(), but this doesn't occur
300      // often enough to be worth the trouble.
301      stream_->SetConnectionReused();
302      new_stream =
303          static_cast<HttpStream*>(stream_.get())->RenewStreamForAuth();
304    }
305
306    if (!new_stream) {
307      // Close the stream and mark it as not_reusable.  Even in the
308      // keep_alive case, we've determined that the stream_ is not
309      // reusable if new_stream is NULL.
310      stream_->Close(true);
311      next_state_ = STATE_CREATE_STREAM;
312    } else {
313      next_state_ = STATE_INIT_STREAM;
314    }
315    stream_.reset(new_stream);
316  }
317
318  // Reset the other member variables.
319  ResetStateForAuthRestart();
320}
321
322bool HttpNetworkTransaction::IsReadyToRestartForAuth() {
323  return pending_auth_target_ != HttpAuth::AUTH_NONE &&
324      HaveAuth(pending_auth_target_);
325}
326
327int HttpNetworkTransaction::Read(IOBuffer* buf, int buf_len,
328                                 const CompletionCallback& callback) {
329  DCHECK(buf);
330  DCHECK_LT(0, buf_len);
331
332  State next_state = STATE_NONE;
333
334  scoped_refptr<HttpResponseHeaders> headers(GetResponseHeaders());
335  if (headers_valid_ && headers.get() && stream_request_.get()) {
336    // We're trying to read the body of the response but we're still trying
337    // to establish an SSL tunnel through an HTTP proxy.  We can't read these
338    // bytes when establishing a tunnel because they might be controlled by
339    // an active network attacker.  We don't worry about this for HTTP
340    // because an active network attacker can already control HTTP sessions.
341    // We reach this case when the user cancels a 407 proxy auth prompt.  We
342    // also don't worry about this for an HTTPS Proxy, because the
343    // communication with the proxy is secure.
344    // See http://crbug.com/8473.
345    DCHECK(proxy_info_.is_http() || proxy_info_.is_https());
346    DCHECK_EQ(headers->response_code(), HTTP_PROXY_AUTHENTICATION_REQUIRED);
347    LOG(WARNING) << "Blocked proxy response with status "
348                 << headers->response_code() << " to CONNECT request for "
349                 << GetHostAndPort(request_->url) << ".";
350    return ERR_TUNNEL_CONNECTION_FAILED;
351  }
352
353  // Are we using SPDY or HTTP?
354  next_state = STATE_READ_BODY;
355
356  read_buf_ = buf;
357  read_buf_len_ = buf_len;
358
359  next_state_ = next_state;
360  int rv = DoLoop(OK);
361  if (rv == ERR_IO_PENDING)
362    callback_ = callback;
363  return rv;
364}
365
366bool HttpNetworkTransaction::GetFullRequestHeaders(
367    HttpRequestHeaders* headers) const {
368  // TODO(ttuttle): Make sure we've populated request_headers_.
369  *headers = request_headers_;
370  return true;
371}
372
373const HttpResponseInfo* HttpNetworkTransaction::GetResponseInfo() const {
374  return ((headers_valid_ && response_.headers.get()) ||
375          response_.ssl_info.cert.get() || response_.cert_request_info.get())
376             ? &response_
377             : NULL;
378}
379
380LoadState HttpNetworkTransaction::GetLoadState() const {
381  // TODO(wtc): Define a new LoadState value for the
382  // STATE_INIT_CONNECTION_COMPLETE state, which delays the HTTP request.
383  switch (next_state_) {
384    case STATE_CREATE_STREAM_COMPLETE:
385      return stream_request_->GetLoadState();
386    case STATE_GENERATE_PROXY_AUTH_TOKEN_COMPLETE:
387    case STATE_GENERATE_SERVER_AUTH_TOKEN_COMPLETE:
388    case STATE_SEND_REQUEST_COMPLETE:
389      return LOAD_STATE_SENDING_REQUEST;
390    case STATE_READ_HEADERS_COMPLETE:
391      return LOAD_STATE_WAITING_FOR_RESPONSE;
392    case STATE_READ_BODY_COMPLETE:
393      return LOAD_STATE_READING_RESPONSE;
394    default:
395      return LOAD_STATE_IDLE;
396  }
397}
398
399UploadProgress HttpNetworkTransaction::GetUploadProgress() const {
400  if (!stream_.get())
401    return UploadProgress();
402
403  // TODO(bashi): This cast is temporary. Remove later.
404  return static_cast<HttpStream*>(stream_.get())->GetUploadProgress();
405}
406
407bool HttpNetworkTransaction::GetLoadTimingInfo(
408    LoadTimingInfo* load_timing_info) const {
409  if (!stream_ || !stream_->GetLoadTimingInfo(load_timing_info))
410    return false;
411
412  load_timing_info->proxy_resolve_start =
413      proxy_info_.proxy_resolve_start_time();
414  load_timing_info->proxy_resolve_end = proxy_info_.proxy_resolve_end_time();
415  load_timing_info->send_start = send_start_time_;
416  load_timing_info->send_end = send_end_time_;
417  return true;
418}
419
420void HttpNetworkTransaction::SetPriority(RequestPriority priority) {
421  priority_ = priority;
422  // TODO(akalin): Plumb this through to |stream_request_| and
423  // |stream_|.
424}
425
426void HttpNetworkTransaction::OnStreamReady(const SSLConfig& used_ssl_config,
427                                           const ProxyInfo& used_proxy_info,
428                                           HttpStreamBase* stream) {
429  DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
430  DCHECK(stream_request_.get());
431
432  stream_.reset(stream);
433  server_ssl_config_ = used_ssl_config;
434  proxy_info_ = used_proxy_info;
435  response_.was_npn_negotiated = stream_request_->was_npn_negotiated();
436  response_.npn_negotiated_protocol = SSLClientSocket::NextProtoToString(
437      stream_request_->protocol_negotiated());
438  response_.was_fetched_via_spdy = stream_request_->using_spdy();
439  response_.was_fetched_via_proxy = !proxy_info_.is_direct();
440
441  OnIOComplete(OK);
442}
443
444void HttpNetworkTransaction::OnWebSocketStreamReady(
445    const SSLConfig& used_ssl_config,
446    const ProxyInfo& used_proxy_info,
447    WebSocketStreamBase* stream) {
448  NOTREACHED() << "This function should never be called.";
449}
450
451void HttpNetworkTransaction::OnStreamFailed(int result,
452                                            const SSLConfig& used_ssl_config) {
453  DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
454  DCHECK_NE(OK, result);
455  DCHECK(stream_request_.get());
456  DCHECK(!stream_.get());
457  server_ssl_config_ = used_ssl_config;
458
459  OnIOComplete(result);
460}
461
462void HttpNetworkTransaction::OnCertificateError(
463    int result,
464    const SSLConfig& used_ssl_config,
465    const SSLInfo& ssl_info) {
466  DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
467  DCHECK_NE(OK, result);
468  DCHECK(stream_request_.get());
469  DCHECK(!stream_.get());
470
471  response_.ssl_info = ssl_info;
472  server_ssl_config_ = used_ssl_config;
473
474  // TODO(mbelshe):  For now, we're going to pass the error through, and that
475  // will close the stream_request in all cases.  This means that we're always
476  // going to restart an entire STATE_CREATE_STREAM, even if the connection is
477  // good and the user chooses to ignore the error.  This is not ideal, but not
478  // the end of the world either.
479
480  OnIOComplete(result);
481}
482
483void HttpNetworkTransaction::OnNeedsProxyAuth(
484    const HttpResponseInfo& proxy_response,
485    const SSLConfig& used_ssl_config,
486    const ProxyInfo& used_proxy_info,
487    HttpAuthController* auth_controller) {
488  DCHECK(stream_request_.get());
489  DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
490
491  establishing_tunnel_ = true;
492  response_.headers = proxy_response.headers;
493  response_.auth_challenge = proxy_response.auth_challenge;
494  headers_valid_ = true;
495  server_ssl_config_ = used_ssl_config;
496  proxy_info_ = used_proxy_info;
497
498  auth_controllers_[HttpAuth::AUTH_PROXY] = auth_controller;
499  pending_auth_target_ = HttpAuth::AUTH_PROXY;
500
501  DoCallback(OK);
502}
503
504void HttpNetworkTransaction::OnNeedsClientAuth(
505    const SSLConfig& used_ssl_config,
506    SSLCertRequestInfo* cert_info) {
507  DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
508
509  server_ssl_config_ = used_ssl_config;
510  response_.cert_request_info = cert_info;
511  OnIOComplete(ERR_SSL_CLIENT_AUTH_CERT_NEEDED);
512}
513
514void HttpNetworkTransaction::OnHttpsProxyTunnelResponse(
515    const HttpResponseInfo& response_info,
516    const SSLConfig& used_ssl_config,
517    const ProxyInfo& used_proxy_info,
518    HttpStreamBase* stream) {
519  DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
520
521  headers_valid_ = true;
522  response_ = response_info;
523  server_ssl_config_ = used_ssl_config;
524  proxy_info_ = used_proxy_info;
525  stream_.reset(stream);
526  stream_request_.reset();  // we're done with the stream request
527  OnIOComplete(ERR_HTTPS_PROXY_TUNNEL_RESPONSE);
528}
529
530bool HttpNetworkTransaction::is_https_request() const {
531  return request_->url.SchemeIs("https");
532}
533
534void HttpNetworkTransaction::DoCallback(int rv) {
535  DCHECK_NE(rv, ERR_IO_PENDING);
536  DCHECK(!callback_.is_null());
537
538  // Since Run may result in Read being called, clear user_callback_ up front.
539  CompletionCallback c = callback_;
540  callback_.Reset();
541  c.Run(rv);
542}
543
544void HttpNetworkTransaction::OnIOComplete(int result) {
545  int rv = DoLoop(result);
546  if (rv != ERR_IO_PENDING)
547    DoCallback(rv);
548}
549
550int HttpNetworkTransaction::DoLoop(int result) {
551  DCHECK(next_state_ != STATE_NONE);
552
553  int rv = result;
554  do {
555    State state = next_state_;
556    next_state_ = STATE_NONE;
557    switch (state) {
558      case STATE_CREATE_STREAM:
559        DCHECK_EQ(OK, rv);
560        rv = DoCreateStream();
561        break;
562      case STATE_CREATE_STREAM_COMPLETE:
563        rv = DoCreateStreamComplete(rv);
564        break;
565      case STATE_INIT_STREAM:
566        DCHECK_EQ(OK, rv);
567        rv = DoInitStream();
568        break;
569      case STATE_INIT_STREAM_COMPLETE:
570        rv = DoInitStreamComplete(rv);
571        break;
572      case STATE_GENERATE_PROXY_AUTH_TOKEN:
573        DCHECK_EQ(OK, rv);
574        rv = DoGenerateProxyAuthToken();
575        break;
576      case STATE_GENERATE_PROXY_AUTH_TOKEN_COMPLETE:
577        rv = DoGenerateProxyAuthTokenComplete(rv);
578        break;
579      case STATE_GENERATE_SERVER_AUTH_TOKEN:
580        DCHECK_EQ(OK, rv);
581        rv = DoGenerateServerAuthToken();
582        break;
583      case STATE_GENERATE_SERVER_AUTH_TOKEN_COMPLETE:
584        rv = DoGenerateServerAuthTokenComplete(rv);
585        break;
586      case STATE_INIT_REQUEST_BODY:
587        DCHECK_EQ(OK, rv);
588        rv = DoInitRequestBody();
589        break;
590      case STATE_INIT_REQUEST_BODY_COMPLETE:
591        rv = DoInitRequestBodyComplete(rv);
592        break;
593      case STATE_BUILD_REQUEST:
594        DCHECK_EQ(OK, rv);
595        net_log_.BeginEvent(NetLog::TYPE_HTTP_TRANSACTION_SEND_REQUEST);
596        rv = DoBuildRequest();
597        break;
598      case STATE_BUILD_REQUEST_COMPLETE:
599        rv = DoBuildRequestComplete(rv);
600        break;
601      case STATE_SEND_REQUEST:
602        DCHECK_EQ(OK, rv);
603        rv = DoSendRequest();
604        break;
605      case STATE_SEND_REQUEST_COMPLETE:
606        rv = DoSendRequestComplete(rv);
607        net_log_.EndEventWithNetErrorCode(
608            NetLog::TYPE_HTTP_TRANSACTION_SEND_REQUEST, rv);
609        break;
610      case STATE_READ_HEADERS:
611        DCHECK_EQ(OK, rv);
612        net_log_.BeginEvent(NetLog::TYPE_HTTP_TRANSACTION_READ_HEADERS);
613        rv = DoReadHeaders();
614        break;
615      case STATE_READ_HEADERS_COMPLETE:
616        rv = DoReadHeadersComplete(rv);
617        net_log_.EndEventWithNetErrorCode(
618            NetLog::TYPE_HTTP_TRANSACTION_READ_HEADERS, rv);
619        break;
620      case STATE_READ_BODY:
621        DCHECK_EQ(OK, rv);
622        net_log_.BeginEvent(NetLog::TYPE_HTTP_TRANSACTION_READ_BODY);
623        rv = DoReadBody();
624        break;
625      case STATE_READ_BODY_COMPLETE:
626        rv = DoReadBodyComplete(rv);
627        net_log_.EndEventWithNetErrorCode(
628            NetLog::TYPE_HTTP_TRANSACTION_READ_BODY, rv);
629        break;
630      case STATE_DRAIN_BODY_FOR_AUTH_RESTART:
631        DCHECK_EQ(OK, rv);
632        net_log_.BeginEvent(
633            NetLog::TYPE_HTTP_TRANSACTION_DRAIN_BODY_FOR_AUTH_RESTART);
634        rv = DoDrainBodyForAuthRestart();
635        break;
636      case STATE_DRAIN_BODY_FOR_AUTH_RESTART_COMPLETE:
637        rv = DoDrainBodyForAuthRestartComplete(rv);
638        net_log_.EndEventWithNetErrorCode(
639            NetLog::TYPE_HTTP_TRANSACTION_DRAIN_BODY_FOR_AUTH_RESTART, rv);
640        break;
641      default:
642        NOTREACHED() << "bad state";
643        rv = ERR_FAILED;
644        break;
645    }
646  } while (rv != ERR_IO_PENDING && next_state_ != STATE_NONE);
647
648  return rv;
649}
650
651int HttpNetworkTransaction::DoCreateStream() {
652  next_state_ = STATE_CREATE_STREAM_COMPLETE;
653
654  stream_request_.reset(
655      session_->http_stream_factory()->RequestStream(
656          *request_,
657          priority_,
658          server_ssl_config_,
659          proxy_ssl_config_,
660          this,
661          net_log_));
662  DCHECK(stream_request_.get());
663  return ERR_IO_PENDING;
664}
665
666int HttpNetworkTransaction::DoCreateStreamComplete(int result) {
667  if (result == OK) {
668    next_state_ = STATE_INIT_STREAM;
669    DCHECK(stream_.get());
670  } else if (result == ERR_SSL_CLIENT_AUTH_CERT_NEEDED) {
671    result = HandleCertificateRequest(result);
672  } else if (result == ERR_HTTPS_PROXY_TUNNEL_RESPONSE) {
673    // Return OK and let the caller read the proxy's error page
674    next_state_ = STATE_NONE;
675    return OK;
676  }
677
678  // Handle possible handshake errors that may have occurred if the stream
679  // used SSL for one or more of the layers.
680  result = HandleSSLHandshakeError(result);
681
682  // At this point we are done with the stream_request_.
683  stream_request_.reset();
684  return result;
685}
686
687int HttpNetworkTransaction::DoInitStream() {
688  DCHECK(stream_.get());
689  next_state_ = STATE_INIT_STREAM_COMPLETE;
690  return stream_->InitializeStream(request_, priority_, net_log_, io_callback_);
691}
692
693int HttpNetworkTransaction::DoInitStreamComplete(int result) {
694  if (result == OK) {
695    next_state_ = STATE_GENERATE_PROXY_AUTH_TOKEN;
696  } else {
697    if (result < 0)
698      result = HandleIOError(result);
699
700    // The stream initialization failed, so this stream will never be useful.
701    stream_.reset();
702  }
703
704  return result;
705}
706
707int HttpNetworkTransaction::DoGenerateProxyAuthToken() {
708  next_state_ = STATE_GENERATE_PROXY_AUTH_TOKEN_COMPLETE;
709  if (!ShouldApplyProxyAuth())
710    return OK;
711  HttpAuth::Target target = HttpAuth::AUTH_PROXY;
712  if (!auth_controllers_[target].get())
713    auth_controllers_[target] =
714        new HttpAuthController(target,
715                               AuthURL(target),
716                               session_->http_auth_cache(),
717                               session_->http_auth_handler_factory());
718  return auth_controllers_[target]->MaybeGenerateAuthToken(request_,
719                                                           io_callback_,
720                                                           net_log_);
721}
722
723int HttpNetworkTransaction::DoGenerateProxyAuthTokenComplete(int rv) {
724  DCHECK_NE(ERR_IO_PENDING, rv);
725  if (rv == OK)
726    next_state_ = STATE_GENERATE_SERVER_AUTH_TOKEN;
727  return rv;
728}
729
730int HttpNetworkTransaction::DoGenerateServerAuthToken() {
731  next_state_ = STATE_GENERATE_SERVER_AUTH_TOKEN_COMPLETE;
732  HttpAuth::Target target = HttpAuth::AUTH_SERVER;
733  if (!auth_controllers_[target].get())
734    auth_controllers_[target] =
735        new HttpAuthController(target,
736                               AuthURL(target),
737                               session_->http_auth_cache(),
738                               session_->http_auth_handler_factory());
739  if (!ShouldApplyServerAuth())
740    return OK;
741  return auth_controllers_[target]->MaybeGenerateAuthToken(request_,
742                                                           io_callback_,
743                                                           net_log_);
744}
745
746int HttpNetworkTransaction::DoGenerateServerAuthTokenComplete(int rv) {
747  DCHECK_NE(ERR_IO_PENDING, rv);
748  if (rv == OK)
749    next_state_ = STATE_INIT_REQUEST_BODY;
750  return rv;
751}
752
753void HttpNetworkTransaction::BuildRequestHeaders(bool using_proxy) {
754  request_headers_.SetHeader(HttpRequestHeaders::kHost,
755                             GetHostAndOptionalPort(request_->url));
756
757  // For compat with HTTP/1.0 servers and proxies:
758  if (using_proxy) {
759    request_headers_.SetHeader(HttpRequestHeaders::kProxyConnection,
760                               "keep-alive");
761  } else {
762    request_headers_.SetHeader(HttpRequestHeaders::kConnection, "keep-alive");
763  }
764
765  // Add a content length header?
766  if (request_->upload_data_stream) {
767    if (request_->upload_data_stream->is_chunked()) {
768      request_headers_.SetHeader(
769          HttpRequestHeaders::kTransferEncoding, "chunked");
770    } else {
771      request_headers_.SetHeader(
772          HttpRequestHeaders::kContentLength,
773          base::Uint64ToString(request_->upload_data_stream->size()));
774    }
775  } else if (request_->method == "POST" || request_->method == "PUT" ||
776             request_->method == "HEAD") {
777    // An empty POST/PUT request still needs a content length.  As for HEAD,
778    // IE and Safari also add a content length header.  Presumably it is to
779    // support sending a HEAD request to an URL that only expects to be sent a
780    // POST or some other method that normally would have a message body.
781    request_headers_.SetHeader(HttpRequestHeaders::kContentLength, "0");
782  }
783
784  // Honor load flags that impact proxy caches.
785  if (request_->load_flags & LOAD_BYPASS_CACHE) {
786    request_headers_.SetHeader(HttpRequestHeaders::kPragma, "no-cache");
787    request_headers_.SetHeader(HttpRequestHeaders::kCacheControl, "no-cache");
788  } else if (request_->load_flags & LOAD_VALIDATE_CACHE) {
789    request_headers_.SetHeader(HttpRequestHeaders::kCacheControl, "max-age=0");
790  }
791
792  if (ShouldApplyProxyAuth() && HaveAuth(HttpAuth::AUTH_PROXY))
793    auth_controllers_[HttpAuth::AUTH_PROXY]->AddAuthorizationHeader(
794        &request_headers_);
795  if (ShouldApplyServerAuth() && HaveAuth(HttpAuth::AUTH_SERVER))
796    auth_controllers_[HttpAuth::AUTH_SERVER]->AddAuthorizationHeader(
797        &request_headers_);
798
799  request_headers_.MergeFrom(request_->extra_headers);
800  response_.did_use_http_auth =
801      request_headers_.HasHeader(HttpRequestHeaders::kAuthorization) ||
802      request_headers_.HasHeader(HttpRequestHeaders::kProxyAuthorization);
803}
804
805int HttpNetworkTransaction::DoInitRequestBody() {
806  next_state_ = STATE_INIT_REQUEST_BODY_COMPLETE;
807  int rv = OK;
808  if (request_->upload_data_stream)
809    rv = request_->upload_data_stream->Init(io_callback_);
810  return rv;
811}
812
813int HttpNetworkTransaction::DoInitRequestBodyComplete(int result) {
814  if (result == OK)
815    next_state_ = STATE_BUILD_REQUEST;
816  return result;
817}
818
819int HttpNetworkTransaction::DoBuildRequest() {
820  next_state_ = STATE_BUILD_REQUEST_COMPLETE;
821  headers_valid_ = false;
822
823  // This is constructed lazily (instead of within our Start method), so that
824  // we have proxy info available.
825  if (request_headers_.IsEmpty()) {
826    bool using_proxy = (proxy_info_.is_http() || proxy_info_.is_https()) &&
827                        !is_https_request();
828    BuildRequestHeaders(using_proxy);
829  }
830
831  return OK;
832}
833
834int HttpNetworkTransaction::DoBuildRequestComplete(int result) {
835  if (result == OK)
836    next_state_ = STATE_SEND_REQUEST;
837  return result;
838}
839
840int HttpNetworkTransaction::DoSendRequest() {
841  send_start_time_ = base::TimeTicks::Now();
842  next_state_ = STATE_SEND_REQUEST_COMPLETE;
843
844  return stream_->SendRequest(request_headers_, &response_, io_callback_);
845}
846
847int HttpNetworkTransaction::DoSendRequestComplete(int result) {
848  send_end_time_ = base::TimeTicks::Now();
849  if (result < 0)
850    return HandleIOError(result);
851  response_.network_accessed = true;
852  next_state_ = STATE_READ_HEADERS;
853  return OK;
854}
855
856int HttpNetworkTransaction::DoReadHeaders() {
857  next_state_ = STATE_READ_HEADERS_COMPLETE;
858  return stream_->ReadResponseHeaders(io_callback_);
859}
860
861int HttpNetworkTransaction::HandleConnectionClosedBeforeEndOfHeaders() {
862  if (!response_.headers.get() && !stream_->IsConnectionReused()) {
863    // The connection was closed before any data was sent. Likely an error
864    // rather than empty HTTP/0.9 response.
865    return ERR_EMPTY_RESPONSE;
866  }
867
868  return OK;
869}
870
871int HttpNetworkTransaction::DoReadHeadersComplete(int result) {
872  // We can get a certificate error or ERR_SSL_CLIENT_AUTH_CERT_NEEDED here
873  // due to SSL renegotiation.
874  if (IsCertificateError(result)) {
875    // We don't handle a certificate error during SSL renegotiation, so we
876    // have to return an error that's not in the certificate error range
877    // (-2xx).
878    LOG(ERROR) << "Got a server certificate with error " << result
879               << " during SSL renegotiation";
880    result = ERR_CERT_ERROR_IN_SSL_RENEGOTIATION;
881  } else if (result == ERR_SSL_CLIENT_AUTH_CERT_NEEDED) {
882    // TODO(wtc): Need a test case for this code path!
883    DCHECK(stream_.get());
884    DCHECK(is_https_request());
885    response_.cert_request_info = new SSLCertRequestInfo;
886    stream_->GetSSLCertRequestInfo(response_.cert_request_info.get());
887    result = HandleCertificateRequest(result);
888    if (result == OK)
889      return result;
890  }
891
892  if (result < 0 && result != ERR_CONNECTION_CLOSED)
893    return HandleIOError(result);
894
895  if (result == ERR_CONNECTION_CLOSED && ShouldResendRequest(result)) {
896    ResetConnectionAndRequestForResend();
897    return OK;
898  }
899
900  // After we call RestartWithAuth a new response_time will be recorded, and
901  // we need to be cautious about incorrectly logging the duration across the
902  // authentication activity.
903  if (result == OK)
904    LogTransactionConnectedMetrics();
905
906  if (result == ERR_CONNECTION_CLOSED) {
907    // For now, if we get at least some data, we do the best we can to make
908    // sense of it and send it back up the stack.
909    int rv = HandleConnectionClosedBeforeEndOfHeaders();
910    if (rv != OK)
911      return rv;
912  }
913  DCHECK(response_.headers.get());
914
915  // Server-induced fallback is supported only if this is a PAC configured
916  // proxy. See: http://crbug.com/143712
917  if (response_.was_fetched_via_proxy && proxy_info_.did_use_pac_script() &&
918      response_.headers.get() != NULL) {
919    bool should_fallback =
920        response_.headers->HasHeaderValue("connection", "proxy-bypass");
921    // Additionally, fallback if a 500 is returned via the data reduction proxy.
922    // This is conservative, as the 500 might have been generated by the origin,
923    // and not the proxy.
924#if defined(SPDY_PROXY_AUTH_ORIGIN)
925    if (!should_fallback) {
926      should_fallback =
927          response_.headers->response_code() == HTTP_INTERNAL_SERVER_ERROR &&
928          proxy_info_.proxy_server().host_port_pair().Equals(
929              HostPortPair::FromURL(GURL(SPDY_PROXY_AUTH_ORIGIN)));
930    }
931#endif
932    if (should_fallback) {
933      ProxyService* proxy_service = session_->proxy_service();
934      if (proxy_service->MarkProxyAsBad(proxy_info_, net_log_)) {
935        // Only retry in the case of GETs. We don't want to resubmit a POST
936        // if the proxy took some action.
937        if (request_->method == "GET") {
938          ResetConnectionAndRequestForResend();
939          return OK;
940        }
941      }
942    }
943  }
944
945  // Like Net.HttpResponseCode, but only for MAIN_FRAME loads.
946  if (request_->load_flags & LOAD_MAIN_FRAME) {
947    const int response_code = response_.headers->response_code();
948    UMA_HISTOGRAM_ENUMERATION(
949        "Net.HttpResponseCode_Nxx_MainFrame", response_code/100, 10);
950  }
951
952  net_log_.AddEvent(
953      NetLog::TYPE_HTTP_TRANSACTION_READ_RESPONSE_HEADERS,
954      base::Bind(&HttpResponseHeaders::NetLogCallback, response_.headers));
955
956  if (response_.headers->GetParsedHttpVersion() < HttpVersion(1, 0)) {
957    // HTTP/0.9 doesn't support the PUT method, so lack of response headers
958    // indicates a buggy server.  See:
959    // https://bugzilla.mozilla.org/show_bug.cgi?id=193921
960    if (request_->method == "PUT")
961      return ERR_METHOD_NOT_SUPPORTED;
962  }
963
964  // Check for an intermediate 100 Continue response.  An origin server is
965  // allowed to send this response even if we didn't ask for it, so we just
966  // need to skip over it.
967  // We treat any other 1xx in this same way (although in practice getting
968  // a 1xx that isn't a 100 is rare).
969  if (response_.headers->response_code() / 100 == 1) {
970    response_.headers = new HttpResponseHeaders(std::string());
971    next_state_ = STATE_READ_HEADERS;
972    return OK;
973  }
974
975  HostPortPair endpoint = HostPortPair(request_->url.HostNoBrackets(),
976                                       request_->url.EffectiveIntPort());
977  ProcessAlternateProtocol(session_->http_stream_factory(),
978                           session_->http_server_properties(),
979                           *response_.headers.get(),
980                           endpoint);
981
982  int rv = HandleAuthChallenge();
983  if (rv != OK)
984    return rv;
985
986  if (is_https_request())
987    stream_->GetSSLInfo(&response_.ssl_info);
988
989  headers_valid_ = true;
990  return OK;
991}
992
993int HttpNetworkTransaction::DoReadBody() {
994  DCHECK(read_buf_.get());
995  DCHECK_GT(read_buf_len_, 0);
996  DCHECK(stream_ != NULL);
997
998  next_state_ = STATE_READ_BODY_COMPLETE;
999  return stream_->ReadResponseBody(
1000      read_buf_.get(), read_buf_len_, io_callback_);
1001}
1002
1003int HttpNetworkTransaction::DoReadBodyComplete(int result) {
1004  // We are done with the Read call.
1005  bool done = false;
1006  if (result <= 0) {
1007    DCHECK_NE(ERR_IO_PENDING, result);
1008    done = true;
1009  }
1010
1011  bool keep_alive = false;
1012  if (stream_->IsResponseBodyComplete()) {
1013    // Note: Just because IsResponseBodyComplete is true, we're not
1014    // necessarily "done".  We're only "done" when it is the last
1015    // read on this HttpNetworkTransaction, which will be signified
1016    // by a zero-length read.
1017    // TODO(mbelshe): The keepalive property is really a property of
1018    //    the stream.  No need to compute it here just to pass back
1019    //    to the stream's Close function.
1020    // TODO(rtenneti): CanFindEndOfResponse should return false if there are no
1021    // ResponseHeaders.
1022    if (stream_->CanFindEndOfResponse()) {
1023      HttpResponseHeaders* headers = GetResponseHeaders();
1024      if (headers)
1025        keep_alive = headers->IsKeepAlive();
1026    }
1027  }
1028
1029  // Clean up connection if we are done.
1030  if (done) {
1031    LogTransactionMetrics();
1032    stream_->Close(!keep_alive);
1033    // Note: we don't reset the stream here.  We've closed it, but we still
1034    // need it around so that callers can call methods such as
1035    // GetUploadProgress() and have them be meaningful.
1036    // TODO(mbelshe): This means we closed the stream here, and we close it
1037    // again in ~HttpNetworkTransaction.  Clean that up.
1038
1039    // The next Read call will return 0 (EOF).
1040  }
1041
1042  // Clear these to avoid leaving around old state.
1043  read_buf_ = NULL;
1044  read_buf_len_ = 0;
1045
1046  return result;
1047}
1048
1049int HttpNetworkTransaction::DoDrainBodyForAuthRestart() {
1050  // This method differs from DoReadBody only in the next_state_.  So we just
1051  // call DoReadBody and override the next_state_.  Perhaps there is a more
1052  // elegant way for these two methods to share code.
1053  int rv = DoReadBody();
1054  DCHECK(next_state_ == STATE_READ_BODY_COMPLETE);
1055  next_state_ = STATE_DRAIN_BODY_FOR_AUTH_RESTART_COMPLETE;
1056  return rv;
1057}
1058
1059// TODO(wtc): This method and the DoReadBodyComplete method are almost
1060// the same.  Figure out a good way for these two methods to share code.
1061int HttpNetworkTransaction::DoDrainBodyForAuthRestartComplete(int result) {
1062  // keep_alive defaults to true because the very reason we're draining the
1063  // response body is to reuse the connection for auth restart.
1064  bool done = false, keep_alive = true;
1065  if (result < 0) {
1066    // Error or closed connection while reading the socket.
1067    done = true;
1068    keep_alive = false;
1069  } else if (stream_->IsResponseBodyComplete()) {
1070    done = true;
1071  }
1072
1073  if (done) {
1074    DidDrainBodyForAuthRestart(keep_alive);
1075  } else {
1076    // Keep draining.
1077    next_state_ = STATE_DRAIN_BODY_FOR_AUTH_RESTART;
1078  }
1079
1080  return OK;
1081}
1082
1083void HttpNetworkTransaction::LogTransactionConnectedMetrics() {
1084  if (logged_response_time_)
1085    return;
1086
1087  logged_response_time_ = true;
1088
1089  base::TimeDelta total_duration = response_.response_time - start_time_;
1090
1091  UMA_HISTOGRAM_CUSTOM_TIMES(
1092      "Net.Transaction_Connected",
1093      total_duration,
1094      base::TimeDelta::FromMilliseconds(1), base::TimeDelta::FromMinutes(10),
1095      100);
1096
1097  bool reused_socket = stream_->IsConnectionReused();
1098  if (!reused_socket) {
1099    UMA_HISTOGRAM_CUSTOM_TIMES(
1100        "Net.Transaction_Connected_New_b",
1101        total_duration,
1102        base::TimeDelta::FromMilliseconds(1), base::TimeDelta::FromMinutes(10),
1103        100);
1104  }
1105
1106  // Currently, non-HIGHEST priority requests are frame or sub-frame resource
1107  // types.  This will change when we also prioritize certain subresources like
1108  // css, js, etc.
1109  if (priority_ != HIGHEST) {
1110    UMA_HISTOGRAM_CUSTOM_TIMES(
1111        "Net.Priority_High_Latency_b",
1112        total_duration,
1113        base::TimeDelta::FromMilliseconds(1), base::TimeDelta::FromMinutes(10),
1114        100);
1115  } else {
1116    UMA_HISTOGRAM_CUSTOM_TIMES(
1117        "Net.Priority_Low_Latency_b",
1118        total_duration,
1119        base::TimeDelta::FromMilliseconds(1), base::TimeDelta::FromMinutes(10),
1120        100);
1121  }
1122}
1123
1124void HttpNetworkTransaction::LogTransactionMetrics() const {
1125  base::TimeDelta duration = base::Time::Now() -
1126                             response_.request_time;
1127  if (60 < duration.InMinutes())
1128    return;
1129
1130  base::TimeDelta total_duration = base::Time::Now() - start_time_;
1131
1132  UMA_HISTOGRAM_CUSTOM_TIMES("Net.Transaction_Latency_b", duration,
1133                             base::TimeDelta::FromMilliseconds(1),
1134                             base::TimeDelta::FromMinutes(10),
1135                             100);
1136  UMA_HISTOGRAM_CUSTOM_TIMES("Net.Transaction_Latency_Total",
1137                             total_duration,
1138                             base::TimeDelta::FromMilliseconds(1),
1139                             base::TimeDelta::FromMinutes(10), 100);
1140
1141  if (!stream_->IsConnectionReused()) {
1142    UMA_HISTOGRAM_CUSTOM_TIMES(
1143        "Net.Transaction_Latency_Total_New_Connection",
1144        total_duration, base::TimeDelta::FromMilliseconds(1),
1145        base::TimeDelta::FromMinutes(10), 100);
1146  }
1147}
1148
1149int HttpNetworkTransaction::HandleCertificateRequest(int error) {
1150  // There are two paths through which the server can request a certificate
1151  // from us.  The first is during the initial handshake, the second is
1152  // during SSL renegotiation.
1153  //
1154  // In both cases, we want to close the connection before proceeding.
1155  // We do this for two reasons:
1156  //   First, we don't want to keep the connection to the server hung for a
1157  //   long time while the user selects a certificate.
1158  //   Second, even if we did keep the connection open, NSS has a bug where
1159  //   restarting the handshake for ClientAuth is currently broken.
1160  DCHECK_EQ(error, ERR_SSL_CLIENT_AUTH_CERT_NEEDED);
1161
1162  if (stream_.get()) {
1163    // Since we already have a stream, we're being called as part of SSL
1164    // renegotiation.
1165    DCHECK(!stream_request_.get());
1166    stream_->Close(true);
1167    stream_.reset();
1168  }
1169
1170  // The server is asking for a client certificate during the initial
1171  // handshake.
1172  stream_request_.reset();
1173
1174  // If the user selected one of the certificates in client_certs or declined
1175  // to provide one for this server before, use the past decision
1176  // automatically.
1177  scoped_refptr<X509Certificate> client_cert;
1178  bool found_cached_cert = session_->ssl_client_auth_cache()->Lookup(
1179      response_.cert_request_info->host_and_port, &client_cert);
1180  if (!found_cached_cert)
1181    return error;
1182
1183  // Check that the certificate selected is still a certificate the server
1184  // is likely to accept, based on the criteria supplied in the
1185  // CertificateRequest message.
1186  if (client_cert.get()) {
1187    const std::vector<std::string>& cert_authorities =
1188        response_.cert_request_info->cert_authorities;
1189
1190    bool cert_still_valid = cert_authorities.empty() ||
1191        client_cert->IsIssuedByEncoded(cert_authorities);
1192    if (!cert_still_valid)
1193      return error;
1194  }
1195
1196  // TODO(davidben): Add a unit test which covers this path; we need to be
1197  // able to send a legitimate certificate and also bypass/clear the
1198  // SSL session cache.
1199  SSLConfig* ssl_config = response_.cert_request_info->is_proxy ?
1200      &proxy_ssl_config_ : &server_ssl_config_;
1201  ssl_config->send_client_cert = true;
1202  ssl_config->client_cert = client_cert;
1203  next_state_ = STATE_CREATE_STREAM;
1204  // Reset the other member variables.
1205  // Note: this is necessary only with SSL renegotiation.
1206  ResetStateForRestart();
1207  return OK;
1208}
1209
1210// TODO(rch): This does not correctly handle errors when an SSL proxy is
1211// being used, as all of the errors are handled as if they were generated
1212// by the endpoint host, request_->url, rather than considering if they were
1213// generated by the SSL proxy. http://crbug.com/69329
1214int HttpNetworkTransaction::HandleSSLHandshakeError(int error) {
1215  DCHECK(request_);
1216  if (server_ssl_config_.send_client_cert &&
1217      (error == ERR_SSL_PROTOCOL_ERROR || IsClientCertificateError(error))) {
1218    session_->ssl_client_auth_cache()->Remove(
1219        GetHostAndPort(request_->url));
1220  }
1221
1222  bool should_fallback = false;
1223  uint16 version_max = server_ssl_config_.version_max;
1224
1225  switch (error) {
1226    case ERR_SSL_PROTOCOL_ERROR:
1227    case ERR_SSL_VERSION_OR_CIPHER_MISMATCH:
1228      if (version_max >= SSL_PROTOCOL_VERSION_TLS1 &&
1229          version_max > server_ssl_config_.version_min) {
1230        // This could be a TLS-intolerant server or a server that chose a
1231        // cipher suite defined only for higher protocol versions (such as
1232        // an SSL 3.0 server that chose a TLS-only cipher suite).  Fall
1233        // back to the next lower version and retry.
1234        // NOTE: if the SSLClientSocket class doesn't support TLS 1.1,
1235        // specifying TLS 1.1 in version_max will result in a TLS 1.0
1236        // handshake, so falling back from TLS 1.1 to TLS 1.0 will simply
1237        // repeat the TLS 1.0 handshake. To avoid this problem, the default
1238        // version_max should match the maximum protocol version supported
1239        // by the SSLClientSocket class.
1240        version_max--;
1241
1242        // Fallback to the lower SSL version.
1243        // While SSL 3.0 fallback should be eliminated because of security
1244        // reasons, there is a high risk of breaking the servers if this is
1245        // done in general.
1246        // For now SSL 3.0 fallback is disabled for Google servers first,
1247        // and will be expanded to other servers after enough experiences
1248        // have been gained showing that this experiment works well with
1249        // today's Internet.
1250        if (version_max > SSL_PROTOCOL_VERSION_SSL3 ||
1251            (server_ssl_config_.unrestricted_ssl3_fallback_enabled ||
1252             !TransportSecurityState::IsGooglePinnedProperty(
1253                 request_->url.host(), true /* include SNI */))) {
1254          should_fallback = true;
1255        }
1256      }
1257      break;
1258    case ERR_SSL_BAD_RECORD_MAC_ALERT:
1259      if (version_max >= SSL_PROTOCOL_VERSION_TLS1_1 &&
1260          version_max > server_ssl_config_.version_min) {
1261        // Some broken SSL devices negotiate TLS 1.0 when sent a TLS 1.1 or
1262        // 1.2 ClientHello, but then return a bad_record_mac alert. See
1263        // crbug.com/260358. In order to make the fallback as minimal as
1264        // possible, this fallback is only triggered for >= TLS 1.1.
1265        version_max--;
1266        should_fallback = true;
1267      }
1268      break;
1269  }
1270
1271  if (should_fallback) {
1272    net_log_.AddEvent(
1273        NetLog::TYPE_SSL_VERSION_FALLBACK,
1274        base::Bind(&NetLogSSLVersionFallbackCallback,
1275                   &request_->url, error, server_ssl_config_.version_max,
1276                   version_max));
1277    server_ssl_config_.version_max = version_max;
1278    server_ssl_config_.version_fallback = true;
1279    ResetConnectionAndRequestForResend();
1280    error = OK;
1281  }
1282
1283  return error;
1284}
1285
1286// This method determines whether it is safe to resend the request after an
1287// IO error.  It can only be called in response to request header or body
1288// write errors or response header read errors.  It should not be used in
1289// other cases, such as a Connect error.
1290int HttpNetworkTransaction::HandleIOError(int error) {
1291  // SSL errors may happen at any time during the stream and indicate issues
1292  // with the underlying connection. Because the peer may request
1293  // renegotiation at any time, check and handle any possible SSL handshake
1294  // related errors. In addition to renegotiation, TLS False Start may cause
1295  // SSL handshake errors (specifically servers with buggy DEFLATE support)
1296  // to be delayed until the first Read on the underlying connection.
1297  error = HandleSSLHandshakeError(error);
1298
1299  switch (error) {
1300    // If we try to reuse a connection that the server is in the process of
1301    // closing, we may end up successfully writing out our request (or a
1302    // portion of our request) only to find a connection error when we try to
1303    // read from (or finish writing to) the socket.
1304    case ERR_CONNECTION_RESET:
1305    case ERR_CONNECTION_CLOSED:
1306    case ERR_CONNECTION_ABORTED:
1307    // There can be a race between the socket pool checking checking whether a
1308    // socket is still connected, receiving the FIN, and sending/reading data
1309    // on a reused socket.  If we receive the FIN between the connectedness
1310    // check and writing/reading from the socket, we may first learn the socket
1311    // is disconnected when we get a ERR_SOCKET_NOT_CONNECTED.  This will most
1312    // likely happen when trying to retrieve its IP address.
1313    // See http://crbug.com/105824 for more details.
1314    case ERR_SOCKET_NOT_CONNECTED:
1315      if (ShouldResendRequest(error)) {
1316        net_log_.AddEventWithNetErrorCode(
1317            NetLog::TYPE_HTTP_TRANSACTION_RESTART_AFTER_ERROR, error);
1318        ResetConnectionAndRequestForResend();
1319        error = OK;
1320      }
1321      break;
1322    case ERR_PIPELINE_EVICTION:
1323      if (!session_->force_http_pipelining()) {
1324        net_log_.AddEventWithNetErrorCode(
1325            NetLog::TYPE_HTTP_TRANSACTION_RESTART_AFTER_ERROR, error);
1326        ResetConnectionAndRequestForResend();
1327        error = OK;
1328      }
1329      break;
1330    case ERR_SPDY_PING_FAILED:
1331    case ERR_SPDY_SERVER_REFUSED_STREAM:
1332      net_log_.AddEventWithNetErrorCode(
1333          NetLog::TYPE_HTTP_TRANSACTION_RESTART_AFTER_ERROR, error);
1334      ResetConnectionAndRequestForResend();
1335      error = OK;
1336      break;
1337  }
1338  return error;
1339}
1340
1341void HttpNetworkTransaction::ResetStateForRestart() {
1342  ResetStateForAuthRestart();
1343  stream_.reset();
1344}
1345
1346void HttpNetworkTransaction::ResetStateForAuthRestart() {
1347  send_start_time_ = base::TimeTicks();
1348  send_end_time_ = base::TimeTicks();
1349
1350  pending_auth_target_ = HttpAuth::AUTH_NONE;
1351  read_buf_ = NULL;
1352  read_buf_len_ = 0;
1353  headers_valid_ = false;
1354  request_headers_.Clear();
1355  response_ = HttpResponseInfo();
1356  establishing_tunnel_ = false;
1357}
1358
1359HttpResponseHeaders* HttpNetworkTransaction::GetResponseHeaders() const {
1360  return response_.headers.get();
1361}
1362
1363bool HttpNetworkTransaction::ShouldResendRequest(int error) const {
1364  bool connection_is_proven = stream_->IsConnectionReused();
1365  bool has_received_headers = GetResponseHeaders() != NULL;
1366
1367  // NOTE: we resend a request only if we reused a keep-alive connection.
1368  // This automatically prevents an infinite resend loop because we'll run
1369  // out of the cached keep-alive connections eventually.
1370  if (connection_is_proven && !has_received_headers)
1371    return true;
1372  return false;
1373}
1374
1375void HttpNetworkTransaction::ResetConnectionAndRequestForResend() {
1376  if (stream_.get()) {
1377    stream_->Close(true);
1378    stream_.reset();
1379  }
1380
1381  // We need to clear request_headers_ because it contains the real request
1382  // headers, but we may need to resend the CONNECT request first to recreate
1383  // the SSL tunnel.
1384  request_headers_.Clear();
1385  next_state_ = STATE_CREATE_STREAM;  // Resend the request.
1386}
1387
1388bool HttpNetworkTransaction::ShouldApplyProxyAuth() const {
1389  return !is_https_request() &&
1390      (proxy_info_.is_https() || proxy_info_.is_http());
1391}
1392
1393bool HttpNetworkTransaction::ShouldApplyServerAuth() const {
1394  return !(request_->load_flags & LOAD_DO_NOT_SEND_AUTH_DATA);
1395}
1396
1397int HttpNetworkTransaction::HandleAuthChallenge() {
1398  scoped_refptr<HttpResponseHeaders> headers(GetResponseHeaders());
1399  DCHECK(headers.get());
1400
1401  int status = headers->response_code();
1402  if (status != HTTP_UNAUTHORIZED &&
1403      status != HTTP_PROXY_AUTHENTICATION_REQUIRED)
1404    return OK;
1405  HttpAuth::Target target = status == HTTP_PROXY_AUTHENTICATION_REQUIRED ?
1406                            HttpAuth::AUTH_PROXY : HttpAuth::AUTH_SERVER;
1407  if (target == HttpAuth::AUTH_PROXY && proxy_info_.is_direct())
1408    return ERR_UNEXPECTED_PROXY_AUTH;
1409
1410  // This case can trigger when an HTTPS server responds with a "Proxy
1411  // authentication required" status code through a non-authenticating
1412  // proxy.
1413  if (!auth_controllers_[target].get())
1414    return ERR_UNEXPECTED_PROXY_AUTH;
1415
1416  int rv = auth_controllers_[target]->HandleAuthChallenge(
1417      headers, (request_->load_flags & LOAD_DO_NOT_SEND_AUTH_DATA) != 0, false,
1418      net_log_);
1419  if (auth_controllers_[target]->HaveAuthHandler())
1420      pending_auth_target_ = target;
1421
1422  scoped_refptr<AuthChallengeInfo> auth_info =
1423      auth_controllers_[target]->auth_info();
1424  if (auth_info.get())
1425      response_.auth_challenge = auth_info;
1426
1427  return rv;
1428}
1429
1430bool HttpNetworkTransaction::HaveAuth(HttpAuth::Target target) const {
1431  return auth_controllers_[target].get() &&
1432      auth_controllers_[target]->HaveAuth();
1433}
1434
1435GURL HttpNetworkTransaction::AuthURL(HttpAuth::Target target) const {
1436  switch (target) {
1437    case HttpAuth::AUTH_PROXY: {
1438      if (!proxy_info_.proxy_server().is_valid() ||
1439          proxy_info_.proxy_server().is_direct()) {
1440        return GURL();  // There is no proxy server.
1441      }
1442      const char* scheme = proxy_info_.is_https() ? "https://" : "http://";
1443      return GURL(scheme +
1444                  proxy_info_.proxy_server().host_port_pair().ToString());
1445    }
1446    case HttpAuth::AUTH_SERVER:
1447      return request_->url;
1448    default:
1449     return GURL();
1450  }
1451}
1452
1453#define STATE_CASE(s) \
1454  case s: \
1455    description = base::StringPrintf("%s (0x%08X)", #s, s); \
1456    break
1457
1458std::string HttpNetworkTransaction::DescribeState(State state) {
1459  std::string description;
1460  switch (state) {
1461    STATE_CASE(STATE_CREATE_STREAM);
1462    STATE_CASE(STATE_CREATE_STREAM_COMPLETE);
1463    STATE_CASE(STATE_INIT_REQUEST_BODY);
1464    STATE_CASE(STATE_INIT_REQUEST_BODY_COMPLETE);
1465    STATE_CASE(STATE_BUILD_REQUEST);
1466    STATE_CASE(STATE_BUILD_REQUEST_COMPLETE);
1467    STATE_CASE(STATE_SEND_REQUEST);
1468    STATE_CASE(STATE_SEND_REQUEST_COMPLETE);
1469    STATE_CASE(STATE_READ_HEADERS);
1470    STATE_CASE(STATE_READ_HEADERS_COMPLETE);
1471    STATE_CASE(STATE_READ_BODY);
1472    STATE_CASE(STATE_READ_BODY_COMPLETE);
1473    STATE_CASE(STATE_DRAIN_BODY_FOR_AUTH_RESTART);
1474    STATE_CASE(STATE_DRAIN_BODY_FOR_AUTH_RESTART_COMPLETE);
1475    STATE_CASE(STATE_NONE);
1476    default:
1477      description = base::StringPrintf("Unknown state 0x%08X (%u)", state,
1478                                       state);
1479      break;
1480  }
1481  return description;
1482}
1483
1484#undef STATE_CASE
1485
1486}  // namespace net
1487