net/http/http_proxy_client_socket.cc

   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_proxy_client_socket.h"
   6
   7 #include "base/bind.h"
   8 #include "base/bind_helpers.h"
   9 #include "base/strings/string_util.h"
  10 #include "base/strings/stringprintf.h"
  11 #include "net/base/auth.h"
  12 #include "net/base/host_port_pair.h"
  13 #include "net/base/io_buffer.h"
  14 #include "net/base/net_log.h"
  15 #include "net/base/net_util.h"
  16 #include "net/base/proxy_delegate.h"
  17 #include "net/http/http_basic_stream.h"
  18 #include "net/http/http_network_session.h"
  19 #include "net/http/http_request_info.h"
  20 #include "net/http/http_response_headers.h"
  21 #include "net/http/http_stream_parser.h"
  22 #include "net/http/proxy_connect_redirect_http_stream.h"
  23 #include "net/socket/client_socket_handle.h"
  24 #include "url/gurl.h"
  25
  26 namespace net {
  27
  28 HttpProxyClientSocket::HttpProxyClientSocket(
  29     ClientSocketHandle* transport_socket,
  30     const GURL& request_url,
  31     const std::string& user_agent,
  32     const HostPortPair& endpoint,
  33     const HostPortPair& proxy_server,
  34     HttpAuthCache* http_auth_cache,
  35     HttpAuthHandlerFactory* http_auth_handler_factory,
  36     bool tunnel,
  37     bool using_spdy,
  38     NextProto protocol_negotiated,
  39     ProxyDelegate* proxy_delegate,
  40     bool is_https_proxy)
  41     : io_callback_(base::Bind(&HttpProxyClientSocket::OnIOComplete,
  42                               base::Unretained(this))),
  43       next_state_(STATE_NONE),
  44       transport_(transport_socket),
  45       endpoint_(endpoint),
  46       auth_(tunnel ?
  47           new HttpAuthController(HttpAuth::AUTH_PROXY,
  48                                  GURL((is_https_proxy ? "https://" : "http://")
  49                                       + proxy_server.ToString()),
  50                                  http_auth_cache,
  51                                  http_auth_handler_factory)
  52           : NULL),
  53       tunnel_(tunnel),
  54       using_spdy_(using_spdy),
  55       protocol_negotiated_(protocol_negotiated),
  56       is_https_proxy_(is_https_proxy),
  57       redirect_has_load_timing_info_(false),
  58       proxy_server_(proxy_server),
  59       proxy_delegate_(proxy_delegate),
  60       net_log_(transport_socket->socket()->NetLog()) {
  61   // Synthesize the bits of a request that we actually use.
  62   request_.url = request_url;
  63   request_.method = "GET";
  64   if (!user_agent.empty())
  65     request_.extra_headers.SetHeader(HttpRequestHeaders::kUserAgent,
  66                                      user_agent);
  67 }
  68
  69 HttpProxyClientSocket::~HttpProxyClientSocket() {
  70   Disconnect();
  71 }
  72
  73 int HttpProxyClientSocket::RestartWithAuth(const CompletionCallback& callback) {
  74   DCHECK_EQ(STATE_NONE, next_state_);
  75   DCHECK(user_callback_.is_null());
  76
  77   int rv = PrepareForAuthRestart();
  78   if (rv != OK)
  79     return rv;
  80
  81   rv = DoLoop(OK);
  82   if (rv == ERR_IO_PENDING) {
  83     if (!callback.is_null())
  84       user_callback_ =  callback;
  85   }
  86
  87   return rv;
  88 }
  89
  90 const scoped_refptr<HttpAuthController>&
  91 HttpProxyClientSocket::GetAuthController() const {
  92   return auth_;
  93 }
  94
  95 bool HttpProxyClientSocket::IsUsingSpdy() const {
  96   return using_spdy_;
  97 }
  98
  99 NextProto HttpProxyClientSocket::GetProtocolNegotiated() const {
 100   return protocol_negotiated_;
 101 }
 102
 103 const HttpResponseInfo* HttpProxyClientSocket::GetConnectResponseInfo() const {
 104   return response_.headers.get() ? &response_ : NULL;
 105 }
 106
 107 HttpStream* HttpProxyClientSocket::CreateConnectResponseStream() {
 108   return new ProxyConnectRedirectHttpStream(
 109       redirect_has_load_timing_info_ ? &redirect_load_timing_info_ : NULL);
 110 }
 111
 112
 113 int HttpProxyClientSocket::Connect(const CompletionCallback& callback) {
 114   DCHECK(transport_.get());
 115   DCHECK(transport_->socket());
 116   DCHECK(user_callback_.is_null());
 117
 118   // TODO(rch): figure out the right way to set up a tunnel with SPDY.
 119   // This approach sends the complete HTTPS request to the proxy
 120   // which allows the proxy to see "private" data.  Instead, we should
 121   // create an SSL tunnel to the origin server using the CONNECT method
 122   // inside a single SPDY stream.
 123   if (using_spdy_ || !tunnel_)
 124     next_state_ = STATE_DONE;
 125   if (next_state_ == STATE_DONE)
 126     return OK;
 127
 128   DCHECK_EQ(STATE_NONE, next_state_);
 129   next_state_ = STATE_GENERATE_AUTH_TOKEN;
 130
 131   int rv = DoLoop(OK);
 132   if (rv == ERR_IO_PENDING)
 133     user_callback_ = callback;
 134   return rv;
 135 }
 136
 137 void HttpProxyClientSocket::Disconnect() {
 138   if (transport_.get())
 139     transport_->socket()->Disconnect();
 140
 141   // Reset other states to make sure they aren't mistakenly used later.
 142   // These are the states initialized by Connect().
 143   next_state_ = STATE_NONE;
 144   user_callback_.Reset();
 145 }
 146
 147 bool HttpProxyClientSocket::IsConnected() const {
 148   return next_state_ == STATE_DONE && transport_->socket()->IsConnected();
 149 }
 150
 151 bool HttpProxyClientSocket::IsConnectedAndIdle() const {
 152   return next_state_ == STATE_DONE &&
 153     transport_->socket()->IsConnectedAndIdle();
 154 }
 155
 156 const BoundNetLog& HttpProxyClientSocket::NetLog() const {
 157   return net_log_;
 158 }
 159
 160 void HttpProxyClientSocket::SetSubresourceSpeculation() {
 161   if (transport_.get() && transport_->socket()) {
 162     transport_->socket()->SetSubresourceSpeculation();
 163   } else {
 164     NOTREACHED();
 165   }
 166 }
 167
 168 void HttpProxyClientSocket::SetOmniboxSpeculation() {
 169   if (transport_.get() && transport_->socket()) {
 170     transport_->socket()->SetOmniboxSpeculation();
 171   } else {
 172     NOTREACHED();
 173   }
 174 }
 175
 176 bool HttpProxyClientSocket::WasEverUsed() const {
 177   if (transport_.get() && transport_->socket()) {
 178     return transport_->socket()->WasEverUsed();
 179   }
 180   NOTREACHED();
 181   return false;
 182 }
 183
 184 bool HttpProxyClientSocket::UsingTCPFastOpen() const {
 185   if (transport_.get() && transport_->socket()) {
 186     return transport_->socket()->UsingTCPFastOpen();
 187   }
 188   NOTREACHED();
 189   return false;
 190 }
 191
 192 bool HttpProxyClientSocket::WasNpnNegotiated() const {
 193   if (transport_.get() && transport_->socket()) {
 194     return transport_->socket()->WasNpnNegotiated();
 195   }
 196   NOTREACHED();
 197   return false;
 198 }
 199
 200 NextProto HttpProxyClientSocket::GetNegotiatedProtocol() const {
 201   if (transport_.get() && transport_->socket()) {
 202     return transport_->socket()->GetNegotiatedProtocol();
 203   }
 204   NOTREACHED();
 205   return kProtoUnknown;
 206 }
 207
 208 bool HttpProxyClientSocket::GetSSLInfo(SSLInfo* ssl_info) {
 209   if (transport_.get() && transport_->socket()) {
 210     return transport_->socket()->GetSSLInfo(ssl_info);
 211   }
 212   NOTREACHED();
 213   return false;
 214 }
 215
 216 int HttpProxyClientSocket::Read(IOBuffer* buf, int buf_len,
 217                                 const CompletionCallback& callback) {
 218   DCHECK(user_callback_.is_null());
 219   if (next_state_ != STATE_DONE) {
 220     // We're trying to read the body of the response but we're still trying
 221     // to establish an SSL tunnel through the proxy.  We can't read these
 222     // bytes when establishing a tunnel because they might be controlled by
 223     // an active network attacker.  We don't worry about this for HTTP
 224     // because an active network attacker can already control HTTP sessions.
 225     // We reach this case when the user cancels a 407 proxy auth prompt.
 226     // See http://crbug.com/8473.
 227     DCHECK_EQ(407, response_.headers->response_code());
 228     LogBlockedTunnelResponse();
 229
 230     return ERR_TUNNEL_CONNECTION_FAILED;
 231   }
 232
 233   return transport_->socket()->Read(buf, buf_len, callback);
 234 }
 235
 236 int HttpProxyClientSocket::Write(IOBuffer* buf, int buf_len,
 237                                  const CompletionCallback& callback) {
 238   DCHECK_EQ(STATE_DONE, next_state_);
 239   DCHECK(user_callback_.is_null());
 240
 241   return transport_->socket()->Write(buf, buf_len, callback);
 242 }
 243
 244 int HttpProxyClientSocket::SetReceiveBufferSize(int32 size) {
 245   return transport_->socket()->SetReceiveBufferSize(size);
 246 }
 247
 248 int HttpProxyClientSocket::SetSendBufferSize(int32 size) {
 249   return transport_->socket()->SetSendBufferSize(size);
 250 }
 251
 252 int HttpProxyClientSocket::GetPeerAddress(IPEndPoint* address) const {
 253   return transport_->socket()->GetPeerAddress(address);
 254 }
 255
 256 int HttpProxyClientSocket::GetLocalAddress(IPEndPoint* address) const {
 257   return transport_->socket()->GetLocalAddress(address);
 258 }
 259
 260 int HttpProxyClientSocket::PrepareForAuthRestart() {
 261   if (!response_.headers.get())
 262     return ERR_CONNECTION_RESET;
 263
 264   bool keep_alive = false;
 265   if (response_.headers->IsKeepAlive() &&
 266       http_stream_parser_->CanFindEndOfResponse()) {
 267     if (!http_stream_parser_->IsResponseBodyComplete()) {
 268       next_state_ = STATE_DRAIN_BODY;
 269       drain_buf_ = new IOBuffer(kDrainBodyBufferSize);
 270       return OK;
 271     }
 272     keep_alive = true;
 273   }
 274
 275   // We don't need to drain the response body, so we act as if we had drained
 276   // the response body.
 277   return DidDrainBodyForAuthRestart(keep_alive);
 278 }
 279
 280 int HttpProxyClientSocket::DidDrainBodyForAuthRestart(bool keep_alive) {
 281   if (keep_alive && transport_->socket()->IsConnectedAndIdle()) {
 282     next_state_ = STATE_GENERATE_AUTH_TOKEN;
 283     transport_->set_reuse_type(ClientSocketHandle::REUSED_IDLE);
 284   } else {
 285     // This assumes that the underlying transport socket is a TCP socket,
 286     // since only TCP sockets are restartable.
 287     next_state_ = STATE_TCP_RESTART;
 288     transport_->socket()->Disconnect();
 289   }
 290
 291   // Reset the other member variables.
 292   drain_buf_ = NULL;
 293   parser_buf_ = NULL;
 294   http_stream_parser_.reset();
 295   request_line_.clear();
 296   request_headers_.Clear();
 297   response_ = HttpResponseInfo();
 298   return OK;
 299 }
 300
 301 void HttpProxyClientSocket::LogBlockedTunnelResponse() const {
 302   ProxyClientSocket::LogBlockedTunnelResponse(
 303       response_.headers->response_code(),
 304       request_.url,
 305       is_https_proxy_);
 306 }
 307
 308 void HttpProxyClientSocket::DoCallback(int result) {
 309   DCHECK_NE(ERR_IO_PENDING, result);
 310   DCHECK(!user_callback_.is_null());
 311
 312   // Since Run() may result in Read being called,
 313   // clear user_callback_ up front.
 314   CompletionCallback c = user_callback_;
 315   user_callback_.Reset();
 316   c.Run(result);
 317 }
 318
 319 void HttpProxyClientSocket::OnIOComplete(int result) {
 320   DCHECK_NE(STATE_NONE, next_state_);
 321   DCHECK_NE(STATE_DONE, next_state_);
 322   int rv = DoLoop(result);
 323   if (rv != ERR_IO_PENDING)
 324     DoCallback(rv);
 325 }
 326
 327 int HttpProxyClientSocket::DoLoop(int last_io_result) {
 328   DCHECK_NE(next_state_, STATE_NONE);
 329   DCHECK_NE(next_state_, STATE_DONE);
 330   int rv = last_io_result;
 331   do {
 332     State state = next_state_;
 333     next_state_ = STATE_NONE;
 334     switch (state) {
 335       case STATE_GENERATE_AUTH_TOKEN:
 336         DCHECK_EQ(OK, rv);
 337         rv = DoGenerateAuthToken();
 338         break;
 339       case STATE_GENERATE_AUTH_TOKEN_COMPLETE:
 340         rv = DoGenerateAuthTokenComplete(rv);
 341         break;
 342       case STATE_SEND_REQUEST:
 343         DCHECK_EQ(OK, rv);
 344         net_log_.BeginEvent(
 345             NetLog::TYPE_HTTP_TRANSACTION_TUNNEL_SEND_REQUEST);
 346         rv = DoSendRequest();
 347         break;
 348       case STATE_SEND_REQUEST_COMPLETE:
 349         rv = DoSendRequestComplete(rv);
 350         net_log_.EndEventWithNetErrorCode(
 351             NetLog::TYPE_HTTP_TRANSACTION_TUNNEL_SEND_REQUEST, rv);
 352         break;
 353       case STATE_READ_HEADERS:
 354         DCHECK_EQ(OK, rv);
 355         net_log_.BeginEvent(
 356             NetLog::TYPE_HTTP_TRANSACTION_TUNNEL_READ_HEADERS);
 357         rv = DoReadHeaders();
 358         break;
 359       case STATE_READ_HEADERS_COMPLETE:
 360         rv = DoReadHeadersComplete(rv);
 361         net_log_.EndEventWithNetErrorCode(
 362             NetLog::TYPE_HTTP_TRANSACTION_TUNNEL_READ_HEADERS, rv);
 363         break;
 364       case STATE_DRAIN_BODY:
 365         DCHECK_EQ(OK, rv);
 366         rv = DoDrainBody();
 367         break;
 368       case STATE_DRAIN_BODY_COMPLETE:
 369         rv = DoDrainBodyComplete(rv);
 370         break;
 371       case STATE_TCP_RESTART:
 372         DCHECK_EQ(OK, rv);
 373         rv = DoTCPRestart();
 374         break;
 375       case STATE_TCP_RESTART_COMPLETE:
 376         rv = DoTCPRestartComplete(rv);
 377         break;
 378       case STATE_DONE:
 379         break;
 380       default:
 381         NOTREACHED() << "bad state";
 382         rv = ERR_UNEXPECTED;
 383         break;
 384     }
 385   } while (rv != ERR_IO_PENDING && next_state_ != STATE_NONE &&
 386            next_state_ != STATE_DONE);
 387   return rv;
 388 }
 389
 390 int HttpProxyClientSocket::DoGenerateAuthToken() {
 391   next_state_ = STATE_GENERATE_AUTH_TOKEN_COMPLETE;
 392   return auth_->MaybeGenerateAuthToken(&request_, io_callback_, net_log_);
 393 }
 394
 395 int HttpProxyClientSocket::DoGenerateAuthTokenComplete(int result) {
 396   DCHECK_NE(ERR_IO_PENDING, result);
 397   if (result == OK)
 398     next_state_ = STATE_SEND_REQUEST;
 399   return result;
 400 }
 401
 402 int HttpProxyClientSocket::DoSendRequest() {
 403   next_state_ = STATE_SEND_REQUEST_COMPLETE;
 404
 405   // This is constructed lazily (instead of within our Start method), so that
 406   // we have proxy info available.
 407   if (request_line_.empty()) {
 408     DCHECK(request_headers_.IsEmpty());
 409     HttpRequestHeaders authorization_headers;
 410     if (auth_->HaveAuth())
 411       auth_->AddAuthorizationHeader(&authorization_headers);
 412     if (proxy_delegate_) {
 413       proxy_delegate_->OnBeforeTunnelRequest(proxy_server_,
 414                                              &authorization_headers);
 415     }
 416     BuildTunnelRequest(request_, authorization_headers, endpoint_,
 417                        &request_line_, &request_headers_);
 418
 419     net_log_.AddEvent(
 420         NetLog::TYPE_HTTP_TRANSACTION_SEND_TUNNEL_HEADERS,
 421         base::Bind(&HttpRequestHeaders::NetLogCallback,
 422                    base::Unretained(&request_headers_),
 423                    &request_line_));
 424   }
 425
 426   parser_buf_ = new GrowableIOBuffer();
 427   http_stream_parser_.reset(new HttpStreamParser(
 428       transport_.get(), &request_, parser_buf_.get(), net_log_));
 429   return http_stream_parser_->SendRequest(
 430       request_line_, request_headers_, &response_, io_callback_);
 431 }
 432
 433 int HttpProxyClientSocket::DoSendRequestComplete(int result) {
 434   if (result < 0)
 435     return result;
 436
 437   next_state_ = STATE_READ_HEADERS;
 438   return OK;
 439 }
 440
 441 int HttpProxyClientSocket::DoReadHeaders() {
 442   next_state_ = STATE_READ_HEADERS_COMPLETE;
 443   return http_stream_parser_->ReadResponseHeaders(io_callback_);
 444 }
 445
 446 int HttpProxyClientSocket::DoReadHeadersComplete(int result) {
 447   if (result < 0)
 448     return result;
 449
 450   // Require the "HTTP/1.x" status line for SSL CONNECT.
 451   if (response_.headers->GetParsedHttpVersion() < HttpVersion(1, 0))
 452     return ERR_TUNNEL_CONNECTION_FAILED;
 453
 454   net_log_.AddEvent(
 455       NetLog::TYPE_HTTP_TRANSACTION_READ_TUNNEL_RESPONSE_HEADERS,
 456       base::Bind(&HttpResponseHeaders::NetLogCallback, response_.headers));
 457
 458   if (proxy_delegate_) {
 459     proxy_delegate_->OnTunnelHeadersReceived(
 460         HostPortPair::FromURL(request_.url),
 461         proxy_server_,
 462         *response_.headers);
 463   }
 464
 465   switch (response_.headers->response_code()) {
 466     case 200:  // OK
 467       if (http_stream_parser_->IsMoreDataBuffered())
 468         // The proxy sent extraneous data after the headers.
 469         return ERR_TUNNEL_CONNECTION_FAILED;
 470
 471       next_state_ = STATE_DONE;
 472       return OK;
 473
 474       // We aren't able to CONNECT to the remote host through the proxy.  We
 475       // need to be very suspicious about the response because an active network
 476       // attacker can force us into this state by masquerading as the proxy.
 477       // The only safe thing to do here is to fail the connection because our
 478       // client is expecting an SSL protected response.
 479       // See http://crbug.com/7338.
 480
 481     case 302:  // Found / Moved Temporarily
 482       // Attempt to follow redirects from HTTPS proxies, but only if we can
 483       // sanitize the response.  This still allows a rogue HTTPS proxy to
 484       // redirect an HTTPS site load to a similar-looking site, but no longer
 485       // allows it to impersonate the site the user requested.
 486       if (!is_https_proxy_ || !SanitizeProxyRedirect(&response_)) {
 487         LogBlockedTunnelResponse();
 488         return ERR_TUNNEL_CONNECTION_FAILED;
 489       }
 490
 491       redirect_has_load_timing_info_ = transport_->GetLoadTimingInfo(
 492           http_stream_parser_->IsConnectionReused(),
 493           &redirect_load_timing_info_);
 494       transport_.reset();
 495       http_stream_parser_.reset();
 496       return ERR_HTTPS_PROXY_TUNNEL_RESPONSE;
 497
 498     case 407:  // Proxy Authentication Required
 499       // We need this status code to allow proxy authentication.  Our
 500       // authentication code is smart enough to avoid being tricked by an
 501       // active network attacker.
 502       // The next state is intentionally not set as it should be STATE_NONE;
 503       if (!SanitizeProxyAuth(&response_)) {
 504         LogBlockedTunnelResponse();
 505         return ERR_TUNNEL_CONNECTION_FAILED;
 506       }
 507       return HandleProxyAuthChallenge(auth_.get(), &response_, net_log_);
 508
 509     default:
 510       // Ignore response to avoid letting the proxy impersonate the target
 511       // server.  (See http://crbug.com/137891.)
 512       // We lose something by doing this.  We have seen proxy 403, 404, and
 513       // 501 response bodies that contain a useful error message.  For
 514       // example, Squid uses a 404 response to report the DNS error: "The
 515       // domain name does not exist."
 516       LogBlockedTunnelResponse();
 517       return ERR_TUNNEL_CONNECTION_FAILED;
 518   }
 519 }
 520
 521 int HttpProxyClientSocket::DoDrainBody() {
 522   DCHECK(drain_buf_.get());
 523   DCHECK(transport_->is_initialized());
 524   next_state_ = STATE_DRAIN_BODY_COMPLETE;
 525   return http_stream_parser_->ReadResponseBody(
 526       drain_buf_.get(), kDrainBodyBufferSize, io_callback_);
 527 }
 528
 529 int HttpProxyClientSocket::DoDrainBodyComplete(int result) {
 530   if (result < 0)
 531     return result;
 532
 533   if (http_stream_parser_->IsResponseBodyComplete())
 534     return DidDrainBodyForAuthRestart(true);
 535
 536   // Keep draining.
 537   next_state_ = STATE_DRAIN_BODY;
 538   return OK;
 539 }
 540
 541 int HttpProxyClientSocket::DoTCPRestart() {
 542   next_state_ = STATE_TCP_RESTART_COMPLETE;
 543   return transport_->socket()->Connect(
 544       base::Bind(&HttpProxyClientSocket::OnIOComplete, base::Unretained(this)));
 545 }
 546
 547 int HttpProxyClientSocket::DoTCPRestartComplete(int result) {
 548   if (result != OK)
 549     return result;
 550
 551   next_state_ = STATE_GENERATE_AUTH_TOKEN;
 552   return result;
 553 }
 554
 555 }  // namespace net