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44f360feae71a1998277509a3abc836af7a584ae
chromium/net/http/http_network_transaction.cc
T
willchan@chromium.org 44f360feae Add some CHECKs to track down the source of a NULL deref in the SSLClientSocketWin code. 
BUG=http://crbug.com/16371
TEST=none

Review URL: http://codereview.chromium.org/155359

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@20415 0039d316-1c4b-4281-b951-d872f2087c98
2009-07-10 21:03:17 +00:00

1788 linhas
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// Copyright (c) 2006-2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/http/http_network_transaction.h"
#include "base/scoped_ptr.h"
#include "base/compiler_specific.h"
#include "base/field_trial.h"
#include "base/string_util.h"
#include "base/trace_event.h"
#include "build/build_config.h"
#include "net/base/connection_type_histograms.h"
#include "net/base/io_buffer.h"
#include "net/base/load_flags.h"
#include "net/base/net_errors.h"
#include "net/base/net_util.h"
#include "net/base/ssl_cert_request_info.h"
#include "net/base/upload_data_stream.h"
#include "net/http/http_auth.h"
#include "net/http/http_auth_handler.h"
#include "net/http/http_basic_stream.h"
#include "net/http/http_chunked_decoder.h"
#include "net/http/http_network_session.h"
#include "net/http/http_request_info.h"
#include "net/http/http_response_headers.h"
#include "net/http/http_util.h"
#include "net/socket/client_socket_factory.h"
#include "net/socket/socks_client_socket.h"
#include "net/socket/ssl_client_socket.h"
using base::Time;
namespace net {
void HttpNetworkTransaction::ResponseHeaders::Realloc(size_t new_size) {
headers_.reset(static_cast<char*>(realloc(headers_.release(), new_size)));
}
namespace {
void BuildRequestHeaders(const HttpRequestInfo* request_info,
const std::string& authorization_headers,
const UploadDataStream* upload_data_stream,
bool using_proxy,
std::string* request_headers) {
const std::string path = using_proxy ?
HttpUtil::SpecForRequest(request_info->url) :
HttpUtil::PathForRequest(request_info->url);
*request_headers =
StringPrintf("%s %s HTTP/1.1\r\nHost: %s\r\n",
request_info->method.c_str(), path.c_str(),
GetHostAndOptionalPort(request_info->url).c_str());
// For compat with HTTP/1.0 servers and proxies:
if (using_proxy)
*request_headers += "Proxy-";
*request_headers += "Connection: keep-alive\r\n";
if (!request_info->user_agent.empty()) {
StringAppendF(request_headers, "User-Agent: %s\r\n",
request_info->user_agent.c_str());
}
// Our consumer should have made sure that this is a safe referrer. See for
// instance WebCore::FrameLoader::HideReferrer.
if (request_info->referrer.is_valid())
StringAppendF(request_headers, "Referer: %s\r\n",
request_info->referrer.spec().c_str());
// Add a content length header?
if (upload_data_stream) {
StringAppendF(request_headers, "Content-Length: %llu\r\n",
upload_data_stream->size());
} else if (request_info->method == "POST" || request_info->method == "PUT" ||
request_info->method == "HEAD") {
// An empty POST/PUT request still needs a content length. As for HEAD,
// IE and Safari also add a content length header. Presumably it is to
// support sending a HEAD request to an URL that only expects to be sent a
// POST or some other method that normally would have a message body.
*request_headers += "Content-Length: 0\r\n";
}
// Honor load flags that impact proxy caches.
if (request_info->load_flags & LOAD_BYPASS_CACHE) {
*request_headers += "Pragma: no-cache\r\nCache-Control: no-cache\r\n";
} else if (request_info->load_flags & LOAD_VALIDATE_CACHE) {
*request_headers += "Cache-Control: max-age=0\r\n";
}
if (!authorization_headers.empty()) {
*request_headers += authorization_headers;
}
// TODO(darin): Need to prune out duplicate headers.
*request_headers += request_info->extra_headers;
*request_headers += "\r\n";
}
// The HTTP CONNECT method for establishing a tunnel connection is documented
// in draft-luotonen-web-proxy-tunneling-01.txt and RFC 2817, Sections 5.2 and
// 5.3.
void BuildTunnelRequest(const HttpRequestInfo* request_info,
const std::string& authorization_headers,
std::string* request_headers) {
// RFC 2616 Section 9 says the Host request-header field MUST accompany all
// HTTP/1.1 requests. Add "Proxy-Connection: keep-alive" for compat with
// HTTP/1.0 proxies such as Squid (required for NTLM authentication).
*request_headers = StringPrintf(
"CONNECT %s HTTP/1.1\r\nHost: %s\r\nProxy-Connection: keep-alive\r\n",
GetHostAndPort(request_info->url).c_str(),
GetHostAndOptionalPort(request_info->url).c_str());
if (!request_info->user_agent.empty())
StringAppendF(request_headers, "User-Agent: %s\r\n",
request_info->user_agent.c_str());
if (!authorization_headers.empty()) {
*request_headers += authorization_headers;
}
*request_headers += "\r\n";
}
} // namespace
//-----------------------------------------------------------------------------
HttpNetworkTransaction::HttpNetworkTransaction(HttpNetworkSession* session,
ClientSocketFactory* csf)
: pending_auth_target_(HttpAuth::AUTH_NONE),
ALLOW_THIS_IN_INITIALIZER_LIST(
io_callback_(this, &HttpNetworkTransaction::OnIOComplete)),
user_callback_(NULL),
session_(session),
request_(NULL),
pac_request_(NULL),
socket_factory_(csf),
connection_(session->connection_pool()),
reused_socket_(false),
using_ssl_(false),
proxy_mode_(kDirectConnection),
establishing_tunnel_(false),
reading_body_from_socket_(false),
request_headers_(new RequestHeaders()),
request_headers_bytes_sent_(0),
header_buf_(new ResponseHeaders()),
header_buf_capacity_(0),
header_buf_len_(0),
header_buf_body_offset_(-1),
header_buf_http_offset_(-1),
response_body_length_(-1), // -1 means unspecified.
response_body_read_(0),
read_buf_len_(0),
next_state_(STATE_NONE) {
#if defined(OS_WIN)
// TODO(port): Port the SSLConfigService class to Linux and Mac OS X.
session->ssl_config_service()->GetSSLConfig(&ssl_config_);
#endif
}
int HttpNetworkTransaction::Start(const HttpRequestInfo* request_info,
CompletionCallback* callback) {
UpdateConnectionTypeHistograms(CONNECTION_ANY);
request_ = request_info;
start_time_ = base::Time::Now();
next_state_ = STATE_RESOLVE_PROXY;
int rv = DoLoop(OK);
if (rv == ERR_IO_PENDING)
user_callback_ = callback;
return rv;
}
int HttpNetworkTransaction::RestartIgnoringLastError(
CompletionCallback* callback) {
if (connection_.socket()->IsConnected()) {
next_state_ = STATE_WRITE_HEADERS;
} else {
connection_.socket()->Disconnect();
connection_.Reset();
next_state_ = STATE_INIT_CONNECTION;
}
int rv = DoLoop(OK);
if (rv == ERR_IO_PENDING)
user_callback_ = callback;
return rv;
}
int HttpNetworkTransaction::RestartWithCertificate(
X509Certificate* client_cert,
CompletionCallback* callback) {
ssl_config_.client_cert = client_cert;
if (client_cert) {
session_->ssl_client_auth_cache()->Add(GetHostAndPort(request_->url),
client_cert);
}
ssl_config_.send_client_cert = true;
next_state_ = STATE_INIT_CONNECTION;
// Reset the other member variables.
// Note: this is necessary only with SSL renegotiation.
ResetStateForRestart();
int rv = DoLoop(OK);
if (rv == ERR_IO_PENDING)
user_callback_ = callback;
return rv;
}
int HttpNetworkTransaction::RestartWithAuth(
const std::wstring& username,
const std::wstring& password,
CompletionCallback* callback) {
HttpAuth::Target target = pending_auth_target_;
if (target == HttpAuth::AUTH_NONE) {
NOTREACHED();
return ERR_UNEXPECTED;
}
pending_auth_target_ = HttpAuth::AUTH_NONE;
DCHECK(auth_identity_[target].invalid ||
(username.empty() && password.empty()));
if (auth_identity_[target].invalid) {
// Update the username/password.
auth_identity_[target].source = HttpAuth::IDENT_SRC_EXTERNAL;
auth_identity_[target].invalid = false;
auth_identity_[target].username = username;
auth_identity_[target].password = password;
}
PrepareForAuthRestart(target);
DCHECK(user_callback_ == NULL);
int rv = DoLoop(OK);
if (rv == ERR_IO_PENDING)
user_callback_ = callback;
return rv;
}
void HttpNetworkTransaction::PrepareForAuthRestart(HttpAuth::Target target) {
DCHECK(HaveAuth(target));
DCHECK(auth_identity_[target].source != HttpAuth::IDENT_SRC_PATH_LOOKUP);
// Add the auth entry to the cache before restarting. We don't know whether
// the identity is valid yet, but if it is valid we want other transactions
// to know about it. If an entry for (origin, handler->realm()) already
// exists, we update it.
//
// If auth_identity_[target].source is HttpAuth::IDENT_SRC_NONE,
// auth_identity_[target] contains no identity because identity is not
// required yet.
bool has_auth_identity =
auth_identity_[target].source != HttpAuth::IDENT_SRC_NONE;
if (has_auth_identity) {
session_->auth_cache()->Add(AuthOrigin(target), auth_handler_[target],
auth_identity_[target].username, auth_identity_[target].password,
AuthPath(target));
}
bool keep_alive = false;
if (response_.headers->IsKeepAlive()) {
// If there is a response body of known length, we need to drain it first.
if (response_body_length_ > 0 || chunked_decoder_.get()) {
next_state_ = STATE_DRAIN_BODY_FOR_AUTH_RESTART;
read_buf_ = new IOBuffer(kDrainBodyBufferSize); // A bit bucket
read_buf_len_ = kDrainBodyBufferSize;
return;
}
if (response_body_length_ == 0) // No response body to drain.
keep_alive = true;
// response_body_length_ is -1 and we're not using chunked encoding. We
// don't know the length of the response body, so we can't reuse this
// connection even though the server says it's keep-alive.
}
// If the auth scheme is connection-based but the proxy/server mistakenly
// marks the connection as non-keep-alive, the auth is going to fail, so log
// an error message.
if (!keep_alive && auth_handler_[target]->is_connection_based() &&
has_auth_identity) {
LOG(ERROR) << "Can't perform " << auth_handler_[target]->scheme()
<< " auth to the " << AuthTargetString(target) << " "
<< AuthOrigin(target) << " over a non-keep-alive connection";
HttpVersion http_version = response_.headers->GetHttpVersion();
LOG(ERROR) << " HTTP version is " << http_version.major_value() << "."
<< http_version.minor_value();
std::string header_val;
void* iter = NULL;
while (response_.headers->EnumerateHeader(&iter, "connection",
&header_val)) {
LOG(ERROR) << " Has header Connection: " << header_val;
}
iter = NULL;
while (response_.headers->EnumerateHeader(&iter, "proxy-connection",
&header_val)) {
LOG(ERROR) << " Has header Proxy-Connection: " << header_val;
}
// RFC 4559 requires that a proxy indicate its support of NTLM/Negotiate
// authentication with a "Proxy-Support: Session-Based-Authentication"
// response header.
iter = NULL;
while (response_.headers->EnumerateHeader(&iter, "proxy-support",
&header_val)) {
LOG(ERROR) << " Has header Proxy-Support: " << header_val;
}
}
// We don't need to drain the response body, so we act as if we had drained
// the response body.
DidDrainBodyForAuthRestart(keep_alive);
}
void HttpNetworkTransaction::DidDrainBodyForAuthRestart(bool keep_alive) {
if (keep_alive) {
next_state_ = STATE_WRITE_HEADERS;
reused_socket_ = true;
} else {
next_state_ = STATE_INIT_CONNECTION;
connection_.socket()->Disconnect();
connection_.Reset();
}
// Reset the other member variables.
ResetStateForRestart();
}
int HttpNetworkTransaction::Read(IOBuffer* buf, int buf_len,
CompletionCallback* callback) {
DCHECK(response_.headers);
DCHECK(buf);
DCHECK(buf_len > 0);
if (!connection_.is_initialized())
return 0; // connection_ has been reset. Treat like EOF.
if (establishing_tunnel_) {
// We're trying to read the body of the response but we're still trying to
// establish an SSL tunnel through the proxy. We can't read these bytes
// when establishing a tunnel because they might be controlled by an active
// network attacker. We don't worry about this for HTTP because an active
// network attacker can already control HTTP sessions.
// We reach this case when the user cancels a 407 proxy auth prompt.
// See http://crbug.com/8473
DCHECK(response_.headers->response_code() == 407);
LogBlockedTunnelResponse(response_.headers->response_code());
return ERR_TUNNEL_CONNECTION_FAILED;
}
// http://crbug.com/16371: We're seeing |user_buf_->data()| return NULL.
// See if the user is passing in an IOBuffer with a NULL |data_|.
CHECK(buf);
CHECK(buf->data());
read_buf_ = buf;
read_buf_len_ = buf_len;
next_state_ = STATE_READ_BODY;
int rv = DoLoop(OK);
if (rv == ERR_IO_PENDING)
user_callback_ = callback;
return rv;
}
const HttpResponseInfo* HttpNetworkTransaction::GetResponseInfo() const {
return (response_.headers || response_.ssl_info.cert ||
response_.cert_request_info) ? &response_ : NULL;
}
LoadState HttpNetworkTransaction::GetLoadState() const {
// TODO(wtc): Define a new LoadState value for the
// STATE_INIT_CONNECTION_COMPLETE state, which delays the HTTP request.
switch (next_state_) {
case STATE_RESOLVE_PROXY_COMPLETE:
return LOAD_STATE_RESOLVING_PROXY_FOR_URL;
case STATE_INIT_CONNECTION_COMPLETE:
return connection_.GetLoadState();
case STATE_WRITE_HEADERS_COMPLETE:
case STATE_WRITE_BODY_COMPLETE:
return LOAD_STATE_SENDING_REQUEST;
case STATE_READ_HEADERS_COMPLETE:
return LOAD_STATE_WAITING_FOR_RESPONSE;
case STATE_READ_BODY_COMPLETE:
return LOAD_STATE_READING_RESPONSE;
default:
return LOAD_STATE_IDLE;
}
}
uint64 HttpNetworkTransaction::GetUploadProgress() const {
if (!request_body_stream_.get())
return 0;
return request_body_stream_->position();
}
HttpNetworkTransaction::~HttpNetworkTransaction() {
// If we still have an open socket, then make sure to disconnect it so it
// won't call us back and we don't try to reuse it later on.
if (connection_.is_initialized())
connection_.socket()->Disconnect();
if (pac_request_)
session_->proxy_service()->CancelPacRequest(pac_request_);
}
void HttpNetworkTransaction::DoCallback(int rv) {
DCHECK(rv != ERR_IO_PENDING);
DCHECK(user_callback_);
// Since Run may result in Read being called, clear user_callback_ up front.
CompletionCallback* c = user_callback_;
user_callback_ = NULL;
c->Run(rv);
}
void HttpNetworkTransaction::OnIOComplete(int result) {
int rv = DoLoop(result);
if (rv != ERR_IO_PENDING)
DoCallback(rv);
}
int HttpNetworkTransaction::DoLoop(int result) {
DCHECK(next_state_ != STATE_NONE);
int rv = result;
do {
State state = next_state_;
next_state_ = STATE_NONE;
switch (state) {
case STATE_RESOLVE_PROXY:
DCHECK_EQ(OK, rv);
TRACE_EVENT_BEGIN("http.resolve_proxy", request_, request_->url.spec());
rv = DoResolveProxy();
break;
case STATE_RESOLVE_PROXY_COMPLETE:
rv = DoResolveProxyComplete(rv);
TRACE_EVENT_END("http.resolve_proxy", request_, request_->url.spec());
break;
case STATE_INIT_CONNECTION:
DCHECK_EQ(OK, rv);
TRACE_EVENT_BEGIN("http.init_conn", request_, request_->url.spec());
rv = DoInitConnection();
break;
case STATE_INIT_CONNECTION_COMPLETE:
rv = DoInitConnectionComplete(rv);
TRACE_EVENT_END("http.init_conn", request_, request_->url.spec());
break;
case STATE_SOCKS_CONNECT:
DCHECK_EQ(OK, rv);
TRACE_EVENT_BEGIN("http.socks_connect", request_, request_->url.spec());
rv = DoSOCKSConnect();
break;
case STATE_SOCKS_CONNECT_COMPLETE:
rv = DoSOCKSConnectComplete(rv);
TRACE_EVENT_END("http.socks_connect", request_, request_->url.spec());
break;
case STATE_SSL_CONNECT:
DCHECK_EQ(OK, rv);
TRACE_EVENT_BEGIN("http.ssl_connect", request_, request_->url.spec());
rv = DoSSLConnect();
break;
case STATE_SSL_CONNECT_COMPLETE:
rv = DoSSLConnectComplete(rv);
TRACE_EVENT_END("http.ssl_connect", request_, request_->url.spec());
break;
case STATE_WRITE_HEADERS:
DCHECK_EQ(OK, rv);
TRACE_EVENT_BEGIN("http.write_headers", request_, request_->url.spec());
rv = DoWriteHeaders();
break;
case STATE_WRITE_HEADERS_COMPLETE:
rv = DoWriteHeadersComplete(rv);
TRACE_EVENT_END("http.write_headers", request_, request_->url.spec());
break;
case STATE_WRITE_BODY:
DCHECK_EQ(OK, rv);
TRACE_EVENT_BEGIN("http.write_body", request_, request_->url.spec());
rv = DoWriteBody();
break;
case STATE_WRITE_BODY_COMPLETE:
rv = DoWriteBodyComplete(rv);
TRACE_EVENT_END("http.write_body", request_, request_->url.spec());
break;
case STATE_READ_HEADERS:
DCHECK_EQ(OK, rv);
TRACE_EVENT_BEGIN("http.read_headers", request_, request_->url.spec());
rv = DoReadHeaders();
break;
case STATE_READ_HEADERS_COMPLETE:
rv = DoReadHeadersComplete(rv);
TRACE_EVENT_END("http.read_headers", request_, request_->url.spec());
break;
case STATE_READ_BODY:
DCHECK_EQ(OK, rv);
TRACE_EVENT_BEGIN("http.read_body", request_, request_->url.spec());
rv = DoReadBody();
break;
case STATE_READ_BODY_COMPLETE:
rv = DoReadBodyComplete(rv);
TRACE_EVENT_END("http.read_body", request_, request_->url.spec());
break;
case STATE_DRAIN_BODY_FOR_AUTH_RESTART:
DCHECK_EQ(OK, rv);
TRACE_EVENT_BEGIN("http.drain_body_for_auth_restart",
request_, request_->url.spec());
rv = DoDrainBodyForAuthRestart();
break;
case STATE_DRAIN_BODY_FOR_AUTH_RESTART_COMPLETE:
rv = DoDrainBodyForAuthRestartComplete(rv);
TRACE_EVENT_END("http.drain_body_for_auth_restart",
request_, request_->url.spec());
break;
default:
NOTREACHED() << "bad state";
rv = ERR_FAILED;
break;
}
} while (rv != ERR_IO_PENDING && next_state_ != STATE_NONE);
return rv;
}
int HttpNetworkTransaction::DoResolveProxy() {
DCHECK(!pac_request_);
next_state_ = STATE_RESOLVE_PROXY_COMPLETE;
if (request_->load_flags & LOAD_BYPASS_PROXY) {
proxy_info_.UseDirect();
return OK;
}
return session_->proxy_service()->ResolveProxy(
request_->url, &proxy_info_, &io_callback_, &pac_request_);
}
int HttpNetworkTransaction::DoResolveProxyComplete(int result) {
next_state_ = STATE_INIT_CONNECTION;
// Remove unsupported proxies (like SOCKS5) from the list.
proxy_info_.RemoveProxiesWithoutScheme(
ProxyServer::SCHEME_DIRECT | ProxyServer::SCHEME_HTTP |
ProxyServer::SCHEME_SOCKS4);
pac_request_ = NULL;
if (result != OK) {
DLOG(ERROR) << "Failed to resolve proxy: " << result;
proxy_info_.UseDirect();
}
return OK;
}
int HttpNetworkTransaction::DoInitConnection() {
DCHECK(!connection_.is_initialized());
next_state_ = STATE_INIT_CONNECTION_COMPLETE;
using_ssl_ = request_->url.SchemeIs("https");
if (proxy_info_.is_direct())
proxy_mode_ = kDirectConnection;
else if (proxy_info_.proxy_server().is_socks())
proxy_mode_ = kSOCKSProxy;
else if (using_ssl_)
proxy_mode_ = kHTTPProxyUsingTunnel;
else
proxy_mode_ = kHTTPProxy;
// Build the string used to uniquely identify connections of this type.
// Determine the host and port to connect to.
std::string connection_group;
std::string host;
int port;
if (proxy_mode_ != kDirectConnection) {
ProxyServer proxy_server = proxy_info_.proxy_server();
connection_group = "proxy/" + proxy_server.ToURI() + "/";
host = proxy_server.HostNoBrackets();
port = proxy_server.port();
} else {
host = request_->url.HostNoBrackets();
port = request_->url.EffectiveIntPort();
}
// For a connection via HTTP proxy not using CONNECT, the connection
// is to the proxy server only. For all other cases
// (direct, HTTP proxy CONNECT, SOCKS), the connection is upto the
// url endpoint. Hence we append the url data into the connection_group.
if (proxy_mode_ != kHTTPProxy)
connection_group.append(request_->url.GetOrigin().spec());
// TODO(willchan): Downgrade this back to a DCHECK after closing
// http://crbug.com/15374.
CHECK(!connection_group.empty()) << "URL: " << request_->url.GetOrigin()
<< ", Host: " << host
<< ", Port: " << port;
HostResolver::RequestInfo resolve_info(host, port);
// The referrer is used by the DNS prefetch system to corellate resolutions
// with the page that triggered them. It doesn't impact the actual addresses
// that we resolve to.
resolve_info.set_referrer(request_->referrer);
// If the user is refreshing the page, bypass the host cache.
if (request_->load_flags & LOAD_BYPASS_CACHE ||
request_->load_flags & LOAD_DISABLE_CACHE) {
resolve_info.set_allow_cached_response(false);
}
int rv = connection_.Init(connection_group, resolve_info, request_->priority,
&io_callback_);
return rv;
}
int HttpNetworkTransaction::DoInitConnectionComplete(int result) {
if (result < 0)
return ReconsiderProxyAfterError(result);
DCHECK(connection_.is_initialized());
// Set the reused_socket_ flag to indicate that we are using a keep-alive
// connection. This flag is used to handle errors that occur while we are
// trying to reuse a keep-alive connection.
reused_socket_ = connection_.is_reused();
if (reused_socket_) {
next_state_ = STATE_WRITE_HEADERS;
} else {
// Now we have a TCP connected socket. Perform other connection setup as
// needed.
LogTCPConnectedMetrics();
if (proxy_mode_ == kSOCKSProxy)
next_state_ = STATE_SOCKS_CONNECT;
else if (using_ssl_ && proxy_mode_ == kDirectConnection) {
next_state_ = STATE_SSL_CONNECT;
} else {
next_state_ = STATE_WRITE_HEADERS;
if (proxy_mode_ == kHTTPProxyUsingTunnel)
establishing_tunnel_ = true;
}
}
http_stream_.reset(new HttpBasicStream(&connection_));
return OK;
}
int HttpNetworkTransaction::DoSOCKSConnect() {
DCHECK_EQ(kSOCKSProxy, proxy_mode_);
next_state_ = STATE_SOCKS_CONNECT_COMPLETE;
// Add a SOCKS connection on top of our existing transport socket.
ClientSocket* s = connection_.release_socket();
HostResolver::RequestInfo req_info(request_->url.HostNoBrackets(),
request_->url.EffectiveIntPort());
req_info.set_referrer(request_->referrer);
s = new SOCKSClientSocket(s, req_info, session_->host_resolver());
connection_.set_socket(s);
return connection_.socket()->Connect(&io_callback_);
}
int HttpNetworkTransaction::DoSOCKSConnectComplete(int result) {
DCHECK_EQ(kSOCKSProxy, proxy_mode_);
if (result == OK) {
if (using_ssl_) {
next_state_ = STATE_SSL_CONNECT;
} else {
next_state_ = STATE_WRITE_HEADERS;
}
} else {
result = ReconsiderProxyAfterError(result);
}
return result;
}
int HttpNetworkTransaction::DoSSLConnect() {
next_state_ = STATE_SSL_CONNECT_COMPLETE;
if (request_->load_flags & LOAD_VERIFY_EV_CERT)
ssl_config_.verify_ev_cert = true;
// Add a SSL socket on top of our existing transport socket.
ClientSocket* s = connection_.release_socket();
s = socket_factory_->CreateSSLClientSocket(
s, request_->url.HostNoBrackets(), ssl_config_);
connection_.set_socket(s);
return connection_.socket()->Connect(&io_callback_);
}
int HttpNetworkTransaction::DoSSLConnectComplete(int result) {
if (IsCertificateError(result))
result = HandleCertificateError(result);
if (result == OK) {
next_state_ = STATE_WRITE_HEADERS;
} else if (result == ERR_SSL_CLIENT_AUTH_CERT_NEEDED) {
result = HandleCertificateRequest(result);
} else {
result = HandleSSLHandshakeError(result);
}
return result;
}
int HttpNetworkTransaction::DoWriteHeaders() {
next_state_ = STATE_WRITE_HEADERS_COMPLETE;
// This is constructed lazily (instead of within our Start method), so that
// we have proxy info available.
if (request_headers_->headers_.empty()) {
// Figure out if we can/should add Proxy-Authentication & Authentication
// headers.
bool have_proxy_auth =
ShouldApplyProxyAuth() &&
(HaveAuth(HttpAuth::AUTH_PROXY) ||
SelectPreemptiveAuth(HttpAuth::AUTH_PROXY));
bool have_server_auth =
ShouldApplyServerAuth() &&
(HaveAuth(HttpAuth::AUTH_SERVER) ||
SelectPreemptiveAuth(HttpAuth::AUTH_SERVER));
std::string authorization_headers;
if (have_proxy_auth)
authorization_headers.append(
BuildAuthorizationHeader(HttpAuth::AUTH_PROXY));
if (have_server_auth)
authorization_headers.append(
BuildAuthorizationHeader(HttpAuth::AUTH_SERVER));
if (establishing_tunnel_) {
BuildTunnelRequest(request_, authorization_headers,
&request_headers_->headers_);
} else {
if (request_->upload_data)
request_body_stream_.reset(new UploadDataStream(request_->upload_data));
BuildRequestHeaders(request_, authorization_headers,
request_body_stream_.get(),
proxy_mode_ == kHTTPProxy,
&request_headers_->headers_);
}
}
// Record our best estimate of the 'request time' as the time when we send
// out the first bytes of the request headers.
if (request_headers_bytes_sent_ == 0) {
response_.request_time = Time::Now();
}
request_headers_->SetDataOffset(request_headers_bytes_sent_);
int buf_len = static_cast<int>(request_headers_->headers_.size() -
request_headers_bytes_sent_);
DCHECK_GT(buf_len, 0);
return http_stream_->Write(request_headers_, buf_len, &io_callback_);
}
int HttpNetworkTransaction::DoWriteHeadersComplete(int result) {
if (result < 0)
return HandleIOError(result);
request_headers_bytes_sent_ += result;
if (request_headers_bytes_sent_ < request_headers_->headers_.size()) {
next_state_ = STATE_WRITE_HEADERS;
} else if (!establishing_tunnel_ && request_body_stream_.get() &&
request_body_stream_->size()) {
next_state_ = STATE_WRITE_BODY;
} else {
next_state_ = STATE_READ_HEADERS;
}
return OK;
}
int HttpNetworkTransaction::DoWriteBody() {
next_state_ = STATE_WRITE_BODY_COMPLETE;
DCHECK(request_body_stream_.get());
DCHECK(request_body_stream_->size());
int buf_len = static_cast<int>(request_body_stream_->buf_len());
return http_stream_->Write(request_body_stream_->buf(), buf_len,
&io_callback_);
}
int HttpNetworkTransaction::DoWriteBodyComplete(int result) {
if (result < 0)
return HandleIOError(result);
request_body_stream_->DidConsume(result);
if (request_body_stream_->position() < request_body_stream_->size()) {
next_state_ = STATE_WRITE_BODY;
} else {
next_state_ = STATE_READ_HEADERS;
}
return OK;
}
int HttpNetworkTransaction::DoReadHeaders() {
next_state_ = STATE_READ_HEADERS_COMPLETE;
// Grow the read buffer if necessary.
if (header_buf_len_ == header_buf_capacity_) {
header_buf_capacity_ += kHeaderBufInitialSize;
header_buf_->Realloc(header_buf_capacity_);
}
int buf_len = header_buf_capacity_ - header_buf_len_;
header_buf_->set_data(header_buf_len_);
// http://crbug.com/16371: We're seeing |user_buf_->data()| return NULL.
// See if the user is passing in an IOBuffer with a NULL |data_|.
CHECK(header_buf_->data());
return http_stream_->Read(header_buf_, buf_len, &io_callback_);
}
int HttpNetworkTransaction::HandleConnectionClosedBeforeEndOfHeaders() {
if (establishing_tunnel_) {
// The connection was closed before the tunnel could be established.
return ERR_TUNNEL_CONNECTION_FAILED;
}
if (has_found_status_line_start()) {
// Assume EOF is end-of-headers.
header_buf_body_offset_ = header_buf_len_;
return OK;
}
// No status line was matched yet. Could have been a HTTP/0.9 response, or
// a partial HTTP/1.x response.
if (header_buf_len_ == 0) {
// The connection was closed before any data was sent. Likely an error
// rather than empty HTTP/0.9 response.
return ERR_EMPTY_RESPONSE;
}
// Assume everything else is a HTTP/0.9 response (including responses
// of 'h', 'ht', 'htt').
header_buf_body_offset_ = 0;
return OK;
}
int HttpNetworkTransaction::DoReadHeadersComplete(int result) {
// We can get a certificate error or ERR_SSL_CLIENT_AUTH_CERT_NEEDED here
// due to SSL renegotiation.
if (using_ssl_) {
if (IsCertificateError(result)) {
// We don't handle a certificate error during SSL renegotiation, so we
// have to return an error that's not in the certificate error range
// (-2xx).
LOG(ERROR) << "Got a server certificate with error " << result
<< " during SSL renegotiation";
result = ERR_CERT_ERROR_IN_SSL_RENEGOTIATION;
} else if (result == ERR_SSL_CLIENT_AUTH_CERT_NEEDED) {
result = HandleCertificateRequest(result);
if (result == OK)
return result;
}
}
if (result < 0)
return HandleIOError(result);
if (result == 0 && ShouldResendRequest()) {
ResetConnectionAndRequestForResend();
return result;
}
// Record our best estimate of the 'response time' as the time when we read
// the first bytes of the response headers.
if (header_buf_len_ == 0) {
// After we call RestartWithAuth header_buf_len will be zero again, and
// we need to be cautious about incorrectly logging the duration across the
// authentication activitiy.
bool first_response = response_.response_time == Time();
response_.response_time = Time::Now();
if (first_response)
LogTransactionConnectedMetrics();
}
// The socket was closed before we found end-of-headers.
if (result == 0) {
int rv = HandleConnectionClosedBeforeEndOfHeaders();
if (rv != OK)
return rv;
} else {
header_buf_len_ += result;
DCHECK(header_buf_len_ <= header_buf_capacity_);
// Look for the start of the status line, if it hasn't been found yet.
if (!has_found_status_line_start()) {
header_buf_http_offset_ = HttpUtil::LocateStartOfStatusLine(
header_buf_->headers(), header_buf_len_);
}
if (has_found_status_line_start()) {
int eoh = HttpUtil::LocateEndOfHeaders(
header_buf_->headers(), header_buf_len_, header_buf_http_offset_);
if (eoh == -1) {
// Prevent growing the headers buffer indefinitely.
if (header_buf_len_ >= kMaxHeaderBufSize)
return ERR_RESPONSE_HEADERS_TOO_BIG;
// Haven't found the end of headers yet, keep reading.
next_state_ = STATE_READ_HEADERS;
return OK;
}
header_buf_body_offset_ = eoh;
} else if (header_buf_len_ < 8) {
// Not enough data to decide whether this is HTTP/0.9 yet.
// 8 bytes = (4 bytes of junk) + "http".length()
next_state_ = STATE_READ_HEADERS;
return OK;
} else {
// Enough data was read -- there is no status line.
header_buf_body_offset_ = 0;
}
}
// And, we are done with the Start or the SSL tunnel CONNECT sequence.
return DidReadResponseHeaders();
}
int HttpNetworkTransaction::DoReadBody() {
DCHECK(read_buf_);
DCHECK_GT(read_buf_len_, 0);
DCHECK(connection_.is_initialized());
DCHECK(!header_buf_->headers() || header_buf_body_offset_ >= 0);
next_state_ = STATE_READ_BODY_COMPLETE;
// We may have already consumed the indicated content length.
if (response_body_length_ != -1 &&
response_body_read_ >= response_body_length_)
return 0;
// We may have some data remaining in the header buffer.
if (header_buf_->headers() && header_buf_body_offset_ < header_buf_len_) {
int n = std::min(read_buf_len_, header_buf_len_ - header_buf_body_offset_);
memcpy(read_buf_->data(), header_buf_->headers() + header_buf_body_offset_,
n);
header_buf_body_offset_ += n;
if (header_buf_body_offset_ == header_buf_len_) {
header_buf_->Reset();
header_buf_capacity_ = 0;
header_buf_len_ = 0;
header_buf_body_offset_ = -1;
}
return n;
}
reading_body_from_socket_ = true;
return http_stream_->Read(read_buf_, read_buf_len_, &io_callback_);
}
int HttpNetworkTransaction::DoReadBodyComplete(int result) {
// We are done with the Read call.
DCHECK(!establishing_tunnel_) <<
"We should never read a response body of a tunnel.";
bool unfiltered_eof = (result == 0 && reading_body_from_socket_);
reading_body_from_socket_ = false;
// Filter incoming data if appropriate. FilterBuf may return an error.
if (result > 0 && chunked_decoder_.get()) {
result = chunked_decoder_->FilterBuf(read_buf_->data(), result);
if (result == 0 && !chunked_decoder_->reached_eof()) {
// Don't signal completion of the Read call yet or else it'll look like
// we received end-of-file. Wait for more data.
next_state_ = STATE_READ_BODY;
return OK;
}
}
bool done = false, keep_alive = false;
if (result < 0) {
// Error while reading the socket.
done = true;
} else {
response_body_read_ += result;
if (unfiltered_eof ||
(response_body_length_ != -1 &&
response_body_read_ >= response_body_length_) ||
(chunked_decoder_.get() && chunked_decoder_->reached_eof())) {
done = true;
keep_alive = response_.headers->IsKeepAlive();
// We can't reuse the connection if we read more than the advertised
// content length.
if (unfiltered_eof ||
(response_body_length_ != -1 &&
response_body_read_ > response_body_length_))
keep_alive = false;
}
}
// Clean up connection_ if we are done.
if (done) {
LogTransactionMetrics();
if (!keep_alive)
connection_.socket()->Disconnect();
connection_.Reset();
// The next Read call will return 0 (EOF).
}
// Clear these to avoid leaving around old state.
read_buf_ = NULL;
read_buf_len_ = 0;
return result;
}
int HttpNetworkTransaction::DoDrainBodyForAuthRestart() {
// This method differs from DoReadBody only in the next_state_. So we just
// call DoReadBody and override the next_state_. Perhaps there is a more
// elegant way for these two methods to share code.
int rv = DoReadBody();
DCHECK(next_state_ == STATE_READ_BODY_COMPLETE);
next_state_ = STATE_DRAIN_BODY_FOR_AUTH_RESTART_COMPLETE;
return rv;
}
// TODO(wtc): The first two thirds of this method and the DoReadBodyComplete
// method are almost the same. Figure out a good way for these two methods
// to share code.
int HttpNetworkTransaction::DoDrainBodyForAuthRestartComplete(int result) {
bool unfiltered_eof = (result == 0 && reading_body_from_socket_);
reading_body_from_socket_ = false;
// Filter incoming data if appropriate. FilterBuf may return an error.
if (result > 0 && chunked_decoder_.get()) {
result = chunked_decoder_->FilterBuf(read_buf_->data(), result);
if (result == 0 && !chunked_decoder_->reached_eof()) {
// Don't signal completion of the Read call yet or else it'll look like
// we received end-of-file. Wait for more data.
next_state_ = STATE_DRAIN_BODY_FOR_AUTH_RESTART;
return OK;
}
}
// keep_alive defaults to true because the very reason we're draining the
// response body is to reuse the connection for auth restart.
bool done = false, keep_alive = true;
if (result < 0) {
// Error while reading the socket.
done = true;
keep_alive = false;
} else {
response_body_read_ += result;
if (unfiltered_eof ||
(response_body_length_ != -1 &&
response_body_read_ >= response_body_length_) ||
(chunked_decoder_.get() && chunked_decoder_->reached_eof())) {
done = true;
// We can't reuse the connection if we read more than the advertised
// content length.
if (unfiltered_eof ||
(response_body_length_ != -1 &&
response_body_read_ > response_body_length_))
keep_alive = false;
}
}
if (done) {
DidDrainBodyForAuthRestart(keep_alive);
} else {
// Keep draining.
next_state_ = STATE_DRAIN_BODY_FOR_AUTH_RESTART;
}
return OK;
}
void HttpNetworkTransaction::LogTCPConnectedMetrics() const {
base::TimeDelta host_resolution_and_tcp_connection_latency =
base::Time::Now() - host_resolution_start_time_;
UMA_HISTOGRAM_CLIPPED_TIMES(
"Net.Dns_Resolution_And_TCP_Connection_Latency",
host_resolution_and_tcp_connection_latency,
base::TimeDelta::FromMilliseconds(1), base::TimeDelta::FromMinutes(10),
100);
UMA_HISTOGRAM_COUNTS_100(
"Net.TCP_Connection_Idle_Sockets",
session_->connection_pool()->IdleSocketCountInGroup(
connection_.group_name()));
}
void HttpNetworkTransaction::LogTransactionConnectedMetrics() const {
base::TimeDelta total_duration = response_.response_time - start_time_;
UMA_HISTOGRAM_CLIPPED_TIMES(
"Net.Transaction_Connected_Under_10",
total_duration,
base::TimeDelta::FromMilliseconds(1), base::TimeDelta::FromMinutes(10),
100);
if (!reused_socket_)
UMA_HISTOGRAM_CLIPPED_TIMES(
"Net.Transaction_Connected_New",
total_duration,
base::TimeDelta::FromMilliseconds(1), base::TimeDelta::FromMinutes(10),
100);
// Currently, non-zero priority requests are frame or sub-frame resource
// types. This will change when we also prioritize certain subresources like
// css, js, etc.
if (request_->priority) {
UMA_HISTOGRAM_CLIPPED_TIMES(
"Net.Priority_High_Latency",
total_duration,
base::TimeDelta::FromMilliseconds(1), base::TimeDelta::FromMinutes(10),
100);
} else {
UMA_HISTOGRAM_CLIPPED_TIMES(
"Net.Priority_Low_Latency",
total_duration,
base::TimeDelta::FromMilliseconds(1), base::TimeDelta::FromMinutes(10),
100);
}
}
void HttpNetworkTransaction::LogTransactionMetrics() const {
base::TimeDelta duration = base::Time::Now() - response_.request_time;
if (60 < duration.InMinutes())
return;
base::TimeDelta total_duration = base::Time::Now() - start_time_;
UMA_HISTOGRAM_LONG_TIMES("Net.Transaction_Latency", duration);
UMA_HISTOGRAM_CLIPPED_TIMES("Net.Transaction_Latency_Under_10", duration,
base::TimeDelta::FromMilliseconds(1), base::TimeDelta::FromMinutes(10),
100);
UMA_HISTOGRAM_CLIPPED_TIMES("Net.Transaction_Latency_Total_Under_10",
total_duration, base::TimeDelta::FromMilliseconds(1),
base::TimeDelta::FromMinutes(10), 100);
if (!reused_socket_) {
UMA_HISTOGRAM_CLIPPED_TIMES(
"Net.Transaction_Latency_Total_New_Connection_Under_10",
total_duration, base::TimeDelta::FromMilliseconds(1),
base::TimeDelta::FromMinutes(10), 100);
}
}
void HttpNetworkTransaction::LogBlockedTunnelResponse(
int response_code) const {
LOG(WARNING) << "Blocked proxy response with status " << response_code
<< " to CONNECT request for "
<< GetHostAndPort(request_->url) << ".";
}
int HttpNetworkTransaction::DidReadResponseHeaders() {
DCHECK_GE(header_buf_body_offset_, 0);
scoped_refptr<HttpResponseHeaders> headers;
if (has_found_status_line_start()) {
headers = new HttpResponseHeaders(
HttpUtil::AssembleRawHeaders(
header_buf_->headers(), header_buf_body_offset_));
} else {
// Fabricate a status line to to preserve the HTTP/0.9 version.
// (otherwise HttpResponseHeaders will default it to HTTP/1.0).
headers = new HttpResponseHeaders(std::string("HTTP/0.9 200 OK"));
}
if (headers->GetParsedHttpVersion() < HttpVersion(1, 0)) {
// Require the "HTTP/1.x" status line for SSL CONNECT.
if (establishing_tunnel_)
return ERR_TUNNEL_CONNECTION_FAILED;
// HTTP/0.9 doesn't support the PUT method, so lack of response headers
// indicates a buggy server. See:
// https://bugzilla.mozilla.org/show_bug.cgi?id=193921
if (request_->method == "PUT")
return ERR_METHOD_NOT_SUPPORTED;
}
if (establishing_tunnel_) {
switch (headers->response_code()) {
case 200: // OK
if (header_buf_body_offset_ != header_buf_len_) {
// The proxy sent extraneous data after the headers.
return ERR_TUNNEL_CONNECTION_FAILED;
}
next_state_ = STATE_SSL_CONNECT;
// Reset for the real request and response headers.
request_headers_->headers_.clear();
request_headers_bytes_sent_ = 0;
header_buf_len_ = 0;
header_buf_body_offset_ = -1;
establishing_tunnel_ = false;
return OK;
// We aren't able to CONNECT to the remote host through the proxy. We
// need to be very suspicious about the response because an active network
// attacker can force us into this state by masquerading as the proxy.
// The only safe thing to do here is to fail the connection because our
// client is expecting an SSL protected response.
// See http://crbug.com/7338.
case 407: // Proxy Authentication Required
// We need this status code to allow proxy authentication. Our
// authentication code is smart enough to avoid being tricked by an
// active network attacker.
break;
default:
// For all other status codes, we conservatively fail the CONNECT
// request.
// We lose something by doing this. We have seen proxy 403, 404, and
// 501 response bodies that contain a useful error message. For
// example, Squid uses a 404 response to report the DNS error: "The
// domain name does not exist."
LogBlockedTunnelResponse(headers->response_code());
return ERR_TUNNEL_CONNECTION_FAILED;
}
}
// Check for an intermediate 100 Continue response. An origin server is
// allowed to send this response even if we didn't ask for it, so we just
// need to skip over it.
// We treat any other 1xx in this same way (although in practice getting
// a 1xx that isn't a 100 is rare).
if (headers->response_code() / 100 == 1) {
header_buf_len_ -= header_buf_body_offset_;
// If we've already received some bytes after the 1xx response,
// move them to the beginning of header_buf_.
if (header_buf_len_) {
memmove(header_buf_->headers(),
header_buf_->headers() + header_buf_body_offset_,
header_buf_len_);
}
header_buf_body_offset_ = -1;
next_state_ = STATE_READ_HEADERS;
return OK;
}
response_.headers = headers;
response_.vary_data.Init(*request_, *response_.headers);
// Figure how to determine EOF:
// For certain responses, we know the content length is always 0. From
// RFC 2616 Section 4.3 Message Body:
//
// For response messages, whether or not a message-body is included with
// a message is dependent on both the request method and the response
// status code (section 6.1.1). All responses to the HEAD request method
// MUST NOT include a message-body, even though the presence of entity-
// header fields might lead one to believe they do. All 1xx
// (informational), 204 (no content), and 304 (not modified) responses
// MUST NOT include a message-body. All other responses do include a
// message-body, although it MAY be of zero length.
switch (response_.headers->response_code()) {
// Note that 1xx was already handled earlier.
case 204: // No Content
case 205: // Reset Content
case 304: // Not Modified
response_body_length_ = 0;
break;
}
if (request_->method == "HEAD")
response_body_length_ = 0;
if (response_body_length_ == -1) {
// Ignore spurious chunked responses from HTTP/1.0 servers and proxies.
// Otherwise "Transfer-Encoding: chunked" trumps "Content-Length: N"
if (response_.headers->GetHttpVersion() >= HttpVersion(1, 1) &&
response_.headers->HasHeaderValue("Transfer-Encoding", "chunked")) {
chunked_decoder_.reset(new HttpChunkedDecoder());
} else {
response_body_length_ = response_.headers->GetContentLength();
// If response_body_length_ is still -1, then we have to wait for the
// server to close the connection.
}
}
int rv = HandleAuthChallenge();
if (rv != OK)
return rv;
if (using_ssl_ && !establishing_tunnel_) {
SSLClientSocket* ssl_socket =
reinterpret_cast<SSLClientSocket*>(connection_.socket());
ssl_socket->GetSSLInfo(&response_.ssl_info);
}
return OK;
}
int HttpNetworkTransaction::HandleCertificateError(int error) {
DCHECK(using_ssl_);
const int kCertFlags = LOAD_IGNORE_CERT_COMMON_NAME_INVALID |
LOAD_IGNORE_CERT_DATE_INVALID |
LOAD_IGNORE_CERT_AUTHORITY_INVALID |
LOAD_IGNORE_CERT_WRONG_USAGE;
if (request_->load_flags & kCertFlags) {
switch (error) {
case ERR_CERT_COMMON_NAME_INVALID:
if (request_->load_flags & LOAD_IGNORE_CERT_COMMON_NAME_INVALID)
error = OK;
break;
case ERR_CERT_DATE_INVALID:
if (request_->load_flags & LOAD_IGNORE_CERT_DATE_INVALID)
error = OK;
break;
case ERR_CERT_AUTHORITY_INVALID:
if (request_->load_flags & LOAD_IGNORE_CERT_AUTHORITY_INVALID)
error = OK;
break;
}
}
if (error != OK) {
SSLClientSocket* ssl_socket =
reinterpret_cast<SSLClientSocket*>(connection_.socket());
ssl_socket->GetSSLInfo(&response_.ssl_info);
// Add the bad certificate to the set of allowed certificates in the
// SSL info object. This data structure will be consulted after calling
// RestartIgnoringLastError(). And the user will be asked interactively
// before RestartIgnoringLastError() is ever called.
ssl_config_.allowed_bad_certs_.insert(response_.ssl_info.cert);
}
return error;
}
int HttpNetworkTransaction::HandleCertificateRequest(int error) {
// Assert that the socket did not send a client certificate.
// Note: If we got a reused socket, it was created with some other
// transaction's ssl_config_, so we need to disable this assertion. We can
// get a certificate request on a reused socket when the server requested
// renegotiation (rehandshake).
// TODO(wtc): add a GetSSLParams method to SSLClientSocket so we can query
// the SSL parameters it was created with and get rid of the reused_socket_
// test.
DCHECK(reused_socket_ || !ssl_config_.send_client_cert);
response_.cert_request_info = new SSLCertRequestInfo;
SSLClientSocket* ssl_socket =
reinterpret_cast<SSLClientSocket*>(connection_.socket());
ssl_socket->GetSSLCertRequestInfo(response_.cert_request_info);
// Close the connection while the user is selecting a certificate to send
// to the server.
connection_.socket()->Disconnect();
connection_.Reset();
// If the user selected one of the certificate in client_certs for this
// server before, use it automatically.
X509Certificate* client_cert = session_->ssl_client_auth_cache()->
Lookup(GetHostAndPort(request_->url));
if (client_cert) {
const std::vector<scoped_refptr<X509Certificate> >& client_certs =
response_.cert_request_info->client_certs;
for (size_t i = 0; i < client_certs.size(); ++i) {
if (client_cert->fingerprint().Equals(client_certs[i]->fingerprint())) {
ssl_config_.client_cert = client_cert;
ssl_config_.send_client_cert = true;
next_state_ = STATE_INIT_CONNECTION;
// Reset the other member variables.
// Note: this is necessary only with SSL renegotiation.
ResetStateForRestart();
return OK;
}
}
}
return error;
}
int HttpNetworkTransaction::HandleSSLHandshakeError(int error) {
if (ssl_config_.send_client_cert &&
(error == ERR_SSL_PROTOCOL_ERROR ||
error == ERR_BAD_SSL_CLIENT_AUTH_CERT)) {
session_->ssl_client_auth_cache()->Remove(GetHostAndPort(request_->url));
}
switch (error) {
case ERR_SSL_PROTOCOL_ERROR:
case ERR_SSL_VERSION_OR_CIPHER_MISMATCH:
if (ssl_config_.tls1_enabled) {
// This could be a TLS-intolerant server or an SSL 3.0 server that
// chose a TLS-only cipher suite. Turn off TLS 1.0 and retry.
ssl_config_.tls1_enabled = false;
connection_.socket()->Disconnect();
connection_.Reset();
next_state_ = STATE_INIT_CONNECTION;
error = OK;
}
break;
}
return error;
}
// This method determines whether it is safe to resend the request after an
// IO error. It can only be called in response to request header or body
// write errors or response header read errors. It should not be used in
// other cases, such as a Connect error.
int HttpNetworkTransaction::HandleIOError(int error) {
switch (error) {
// If we try to reuse a connection that the server is in the process of
// closing, we may end up successfully writing out our request (or a
// portion of our request) only to find a connection error when we try to
// read from (or finish writing to) the socket.
case ERR_CONNECTION_RESET:
case ERR_CONNECTION_CLOSED:
case ERR_CONNECTION_ABORTED:
if (ShouldResendRequest()) {
ResetConnectionAndRequestForResend();
error = OK;
}
break;
}
return error;
}
void HttpNetworkTransaction::ResetStateForRestart() {
pending_auth_target_ = HttpAuth::AUTH_NONE;
header_buf_->Reset();
header_buf_capacity_ = 0;
header_buf_len_ = 0;
header_buf_body_offset_ = -1;
header_buf_http_offset_ = -1;
response_body_length_ = -1;
response_body_read_ = 0;
read_buf_ = NULL;
read_buf_len_ = 0;
request_headers_->headers_.clear();
request_headers_bytes_sent_ = 0;
chunked_decoder_.reset();
// Reset all the members of response_.
response_ = HttpResponseInfo();
}
bool HttpNetworkTransaction::ShouldResendRequest() const {
// NOTE: we resend a request only if we reused a keep-alive connection.
// This automatically prevents an infinite resend loop because we'll run
// out of the cached keep-alive connections eventually.
if (establishing_tunnel_ ||
!reused_socket_ || // We didn't reuse a keep-alive connection.
header_buf_len_) { // We have received some response headers.
return false;
}
return true;
}
void HttpNetworkTransaction::ResetConnectionAndRequestForResend() {
connection_.socket()->Disconnect();
connection_.Reset();
// There are two reasons we need to clear request_headers_. 1) It contains
// the real request headers, but we may need to resend the CONNECT request
// first to recreate the SSL tunnel. 2) An empty request_headers_ causes
// BuildRequestHeaders to be called, which rewinds request_body_stream_ to
// the beginning of request_->upload_data.
request_headers_->headers_.clear();
request_headers_bytes_sent_ = 0;
next_state_ = STATE_INIT_CONNECTION; // Resend the request.
}
int HttpNetworkTransaction::ReconsiderProxyAfterError(int error) {
DCHECK(!pac_request_);
// A failure to resolve the hostname or any error related to establishing a
// TCP connection could be grounds for trying a new proxy configuration.
//
// Why do this when a hostname cannot be resolved? Some URLs only make sense
// to proxy servers. The hostname in those URLs might fail to resolve if we
// are still using a non-proxy config. We need to check if a proxy config
// now exists that corresponds to a proxy server that could load the URL.
//
switch (error) {
case ERR_NAME_NOT_RESOLVED:
case ERR_INTERNET_DISCONNECTED:
case ERR_ADDRESS_UNREACHABLE:
case ERR_CONNECTION_CLOSED:
case ERR_CONNECTION_RESET:
case ERR_CONNECTION_REFUSED:
case ERR_CONNECTION_ABORTED:
case ERR_TIMED_OUT:
case ERR_TUNNEL_CONNECTION_FAILED:
break;
default:
return error;
}
if (request_->load_flags & LOAD_BYPASS_PROXY) {
return error;
}
int rv = session_->proxy_service()->ReconsiderProxyAfterError(
request_->url, &proxy_info_, &io_callback_, &pac_request_);
if (rv == OK || rv == ERR_IO_PENDING) {
// If the error was during connection setup, there is no socket to
// disconnect.
if (connection_.socket())
connection_.socket()->Disconnect();
connection_.Reset();
DCHECK(!request_headers_bytes_sent_);
next_state_ = STATE_RESOLVE_PROXY_COMPLETE;
} else {
rv = error;
}
return rv;
}
bool HttpNetworkTransaction::ShouldApplyProxyAuth() const {
return (proxy_mode_ == kHTTPProxy) || establishing_tunnel_;
}
bool HttpNetworkTransaction::ShouldApplyServerAuth() const {
return !establishing_tunnel_;
}
std::string HttpNetworkTransaction::BuildAuthorizationHeader(
HttpAuth::Target target) const {
DCHECK(HaveAuth(target));
// Add a Authorization/Proxy-Authorization header line.
std::string credentials = auth_handler_[target]->GenerateCredentials(
auth_identity_[target].username,
auth_identity_[target].password,
request_,
&proxy_info_);
return HttpAuth::GetAuthorizationHeaderName(target) +
": " + credentials + "\r\n";
}
GURL HttpNetworkTransaction::AuthOrigin(HttpAuth::Target target) const {
return target == HttpAuth::AUTH_PROXY ?
GURL("http://" + proxy_info_.proxy_server().host_and_port()) :
request_->url.GetOrigin();
}
std::string HttpNetworkTransaction::AuthPath(HttpAuth::Target target)
const {
// Proxy authentication realms apply to all paths. So we will use
// empty string in place of an absolute path.
return target == HttpAuth::AUTH_PROXY ?
std::string() : request_->url.path();
}
// static
std::string HttpNetworkTransaction::AuthTargetString(
HttpAuth::Target target) {
return target == HttpAuth::AUTH_PROXY ? "proxy" : "server";
}
void HttpNetworkTransaction::InvalidateRejectedAuthFromCache(
HttpAuth::Target target) {
DCHECK(HaveAuth(target));
// TODO(eroman): this short-circuit can be relaxed. If the realm of
// the preemptively used auth entry matches the realm of the subsequent
// challenge, then we can invalidate the preemptively used entry.
// Otherwise as-is we may send the failed credentials one extra time.
if (auth_identity_[target].source == HttpAuth::IDENT_SRC_PATH_LOOKUP)
return;
// Clear the cache entry for the identity we just failed on.
// Note: we require the username/password to match before invalidating
// since the entry in the cache may be newer than what we used last time.
session_->auth_cache()->Remove(AuthOrigin(target),
auth_handler_[target]->realm(),
auth_identity_[target].username,
auth_identity_[target].password);
}
bool HttpNetworkTransaction::SelectPreemptiveAuth(HttpAuth::Target target) {
DCHECK(!HaveAuth(target));
// Don't do preemptive authorization if the URL contains a username/password,
// since we must first be challenged in order to use the URL's identity.
if (request_->url.has_username())
return false;
// SelectPreemptiveAuth() is on the critical path for each request, so it
// is expected to be fast. LookupByPath() is fast in the common case, since
// the number of http auth cache entries is expected to be very small.
// (For most users in fact, it will be 0.)
HttpAuthCache::Entry* entry = session_->auth_cache()->LookupByPath(
AuthOrigin(target), AuthPath(target));
// We don't support preemptive authentication for connection-based
// authentication schemes because they can't reuse entry->handler().
// Hopefully we can remove this limitation in the future.
if (entry && !entry->handler()->is_connection_based()) {
auth_identity_[target].source = HttpAuth::IDENT_SRC_PATH_LOOKUP;
auth_identity_[target].invalid = false;
auth_identity_[target].username = entry->username();
auth_identity_[target].password = entry->password();
auth_handler_[target] = entry->handler();
return true;
}
return false;
}
bool HttpNetworkTransaction::SelectNextAuthIdentityToTry(
HttpAuth::Target target) {
DCHECK(auth_handler_[target]);
DCHECK(auth_identity_[target].invalid);
// Try to use the username/password encoded into the URL first.
// (By checking source == IDENT_SRC_NONE, we make sure that this
// is only done once for the transaction.)
if (target == HttpAuth::AUTH_SERVER && request_->url.has_username() &&
auth_identity_[target].source == HttpAuth::IDENT_SRC_NONE) {
auth_identity_[target].source = HttpAuth::IDENT_SRC_URL;
auth_identity_[target].invalid = false;
// TODO(wtc) It may be necessary to unescape the username and password
// after extracting them from the URL. We should be careful about
// embedded nulls in that case.
auth_identity_[target].username = ASCIIToWide(request_->url.username());
auth_identity_[target].password = ASCIIToWide(request_->url.password());
// TODO(eroman): If the password is blank, should we also try combining
// with a password from the cache?
return true;
}
// Check the auth cache for a realm entry.
HttpAuthCache::Entry* entry = session_->auth_cache()->LookupByRealm(
AuthOrigin(target), auth_handler_[target]->realm());
if (entry) {
// Disallow re-using of identity if the scheme of the originating challenge
// does not match. This protects against the following situation:
// 1. Browser prompts user to sign into DIGEST realm="Foo".
// 2. Since the auth-scheme is not BASIC, the user is reasured that it
// will not be sent over the wire in clear text. So they use their
// most trusted password.
// 3. Next, the browser receives a challenge for BASIC realm="Foo". This
// is the same realm that we have a cached identity for. However if
// we use that identity, it would get sent over the wire in
// clear text (which isn't what the user agreed to when entering it).
if (entry->handler()->scheme() != auth_handler_[target]->scheme()) {
LOG(WARNING) << "The scheme of realm " << auth_handler_[target]->realm()
<< " has changed from " << entry->handler()->scheme()
<< " to " << auth_handler_[target]->scheme();
return false;
}
auth_identity_[target].source = HttpAuth::IDENT_SRC_REALM_LOOKUP;
auth_identity_[target].invalid = false;
auth_identity_[target].username = entry->username();
auth_identity_[target].password = entry->password();
return true;
}
return false;
}
std::string HttpNetworkTransaction::AuthChallengeLogMessage() const {
std::string msg;
std::string header_val;
void* iter = NULL;
while (response_.headers->EnumerateHeader(&iter, "proxy-authenticate",
&header_val)) {
msg.append("\n Has header Proxy-Authenticate: ");
msg.append(header_val);
}
iter = NULL;
while (response_.headers->EnumerateHeader(&iter, "www-authenticate",
&header_val)) {
msg.append("\n Has header WWW-Authenticate: ");
msg.append(header_val);
}
// RFC 4559 requires that a proxy indicate its support of NTLM/Negotiate
// authentication with a "Proxy-Support: Session-Based-Authentication"
// response header.
iter = NULL;
while (response_.headers->EnumerateHeader(&iter, "proxy-support",
&header_val)) {
msg.append("\n Has header Proxy-Support: ");
msg.append(header_val);
}
return msg;
}
int HttpNetworkTransaction::HandleAuthChallenge() {
DCHECK(response_.headers);
int status = response_.headers->response_code();
if (status != 401 && status != 407)
return OK;
HttpAuth::Target target = status == 407 ?
HttpAuth::AUTH_PROXY : HttpAuth::AUTH_SERVER;
LOG(INFO) << "The " << AuthTargetString(target) << " "
<< AuthOrigin(target) << " requested auth"
<< AuthChallengeLogMessage();
if (target == HttpAuth::AUTH_PROXY && proxy_info_.is_direct())
return ERR_UNEXPECTED_PROXY_AUTH;
// The auth we tried just failed, hence it can't be valid. Remove it from
// the cache so it won't be used again, unless it's a null identity.
if (HaveAuth(target) &&
auth_identity_[target].source != HttpAuth::IDENT_SRC_NONE)
InvalidateRejectedAuthFromCache(target);
auth_identity_[target].invalid = true;
// Find the best authentication challenge that we support.
HttpAuth::ChooseBestChallenge(response_.headers.get(),
target,
&auth_handler_[target]);
if (!auth_handler_[target]) {
if (establishing_tunnel_) {
LOG(ERROR) << "Can't perform auth to the " << AuthTargetString(target)
<< " " << AuthOrigin(target)
<< " when establishing a tunnel"
<< AuthChallengeLogMessage();
// We are establishing a tunnel, we can't show the error page because an
// active network attacker could control its contents. Instead, we just
// fail to establish the tunnel.
DCHECK(target == HttpAuth::AUTH_PROXY);
return ERR_PROXY_AUTH_REQUESTED;
}
// We found no supported challenge -- let the transaction continue
// so we end up displaying the error page.
return OK;
}
if (auth_handler_[target]->NeedsIdentity()) {
// Pick a new auth identity to try, by looking to the URL and auth cache.
// If an identity to try is found, it is saved to auth_identity_[target].
SelectNextAuthIdentityToTry(target);
} else {
// Proceed with a null identity.
//
// TODO(wtc): Add a safeguard against infinite transaction restarts, if
// the server keeps returning "NTLM".
auth_identity_[target].source = HttpAuth::IDENT_SRC_NONE;
auth_identity_[target].invalid = false;
auth_identity_[target].username.clear();
auth_identity_[target].password.clear();
}
// Make a note that we are waiting for auth. This variable is inspected
// when the client calls RestartWithAuth() to pick up where we left off.
pending_auth_target_ = target;
if (auth_identity_[target].invalid) {
// We have exhausted all identity possibilities, all we can do now is
// pass the challenge information back to the client.
PopulateAuthChallenge(target);
}
return OK;
}
void HttpNetworkTransaction::PopulateAuthChallenge(HttpAuth::Target target) {
// Populates response_.auth_challenge with the authentication challenge info.
// This info is consumed by URLRequestHttpJob::GetAuthChallengeInfo().
AuthChallengeInfo* auth_info = new AuthChallengeInfo;
auth_info->is_proxy = target == HttpAuth::AUTH_PROXY;
auth_info->scheme = ASCIIToWide(auth_handler_[target]->scheme());
// TODO(eroman): decode realm according to RFC 2047.
auth_info->realm = ASCIIToWide(auth_handler_[target]->realm());
std::string host_and_port;
if (target == HttpAuth::AUTH_PROXY) {
host_and_port = proxy_info_.proxy_server().host_and_port();
} else {
DCHECK(target == HttpAuth::AUTH_SERVER);
host_and_port = GetHostAndPort(request_->url);
}
auth_info->host_and_port = ASCIIToWide(host_and_port);
response_.auth_challenge = auth_info;
}
} // namespace net
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