net/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/proxy_client_socket.h"
   6
   7 #include "base/metrics/histogram.h"
   8 #include "base/strings/stringprintf.h"
   9 #include "net/base/host_port_pair.h"
  10 #include "net/base/net_errors.h"
  11 #include "net/base/net_util.h"
  12 #include "net/http/http_auth_controller.h"
  13 #include "net/http/http_request_info.h"
  14 #include "net/http/http_response_headers.h"
  15 #include "net/http/http_response_info.h"
  16 #include "url/gurl.h"
  17
  18 namespace net {
  19
  20 namespace {
  21
  22 void CopyHeaderValues(scoped_refptr<HttpResponseHeaders> source,
  23                       scoped_refptr<HttpResponseHeaders> dest,
  24                       const std::string& header_name) {
  25   void* iter = NULL;
  26   std::string header_value;
  27
  28   while (source->EnumerateHeader(&iter, header_name, &header_value))
  29     dest->AddHeader(header_name + ": " + header_value);
  30 }
  31
  32 }  // namespace
  33
  34 // static
  35 void ProxyClientSocket::BuildTunnelRequest(
  36     const HttpRequestInfo& request_info,
  37     const HttpRequestHeaders& auth_headers,
  38     const HostPortPair& endpoint,
  39     std::string* request_line,
  40     HttpRequestHeaders* request_headers) {
  41   // RFC 2616 Section 9 says the Host request-header field MUST accompany all
  42   // HTTP/1.1 requests.  Add "Proxy-Connection: keep-alive" for compat with
  43   // HTTP/1.0 proxies such as Squid (required for NTLM authentication).
  44   *request_line = base::StringPrintf(
  45       "CONNECT %s HTTP/1.1\r\n", endpoint.ToString().c_str());
  46   request_headers->SetHeader(HttpRequestHeaders::kHost,
  47                              GetHostAndOptionalPort(request_info.url));
  48   request_headers->SetHeader(HttpRequestHeaders::kProxyConnection,
  49                              "keep-alive");
  50
  51   std::string user_agent;
  52   if (request_info.extra_headers.GetHeader(HttpRequestHeaders::kUserAgent,
  53                                             &user_agent))
  54     request_headers->SetHeader(HttpRequestHeaders::kUserAgent, user_agent);
  55
  56   request_headers->MergeFrom(auth_headers);
  57 }
  58
  59 // static
  60 int ProxyClientSocket::HandleProxyAuthChallenge(HttpAuthController* auth,
  61                                                 HttpResponseInfo* response,
  62                                                 const BoundNetLog& net_log) {
  63   DCHECK(response->headers.get());
  64   int rv = auth->HandleAuthChallenge(response->headers, false, true, net_log);
  65   response->auth_challenge = auth->auth_info();
  66   if (rv == OK)
  67     return ERR_PROXY_AUTH_REQUESTED;
  68   return rv;
  69 }
  70
  71 // static
  72 void ProxyClientSocket::LogBlockedTunnelResponse(int http_status_code,
  73                                                  const GURL& url,
  74                                                  bool is_https_proxy) {
  75   if (is_https_proxy) {
  76     UMA_HISTOGRAM_CUSTOM_ENUMERATION(
  77         "Net.BlockedTunnelResponse.HttpsProxy",
  78         HttpUtil::MapStatusCodeForHistogram(http_status_code),
  79         HttpUtil::GetStatusCodesForHistogram());
  80   } else {
  81     UMA_HISTOGRAM_CUSTOM_ENUMERATION(
  82         "Net.BlockedTunnelResponse.HttpProxy",
  83         HttpUtil::MapStatusCodeForHistogram(http_status_code),
  84         HttpUtil::GetStatusCodesForHistogram());
  85   }
  86 }
  87
  88 // static
  89 bool ProxyClientSocket::SanitizeProxyAuth(HttpResponseInfo* response) {
  90   DCHECK(response && response->headers.get());
  91
  92   scoped_refptr<HttpResponseHeaders> old_headers = response->headers;
  93
  94   const char kHeaders[] = "HTTP/1.1 407 Proxy Authentication Required\n\n";
  95   scoped_refptr<HttpResponseHeaders> new_headers = new HttpResponseHeaders(
  96       HttpUtil::AssembleRawHeaders(kHeaders, arraysize(kHeaders)));
  97
  98   // Copy status line and all hop-by-hop headers to preserve keep-alive
  99   // behavior.
 100   new_headers->ReplaceStatusLine(old_headers->GetStatusLine());
 101   CopyHeaderValues(old_headers, new_headers, "connection");
 102   CopyHeaderValues(old_headers, new_headers, "proxy-connection");
 103   CopyHeaderValues(old_headers, new_headers, "keep-alive");
 104   CopyHeaderValues(old_headers, new_headers, "trailer");
 105   CopyHeaderValues(old_headers, new_headers, "transfer-encoding");
 106   CopyHeaderValues(old_headers, new_headers, "upgrade");
 107
 108   CopyHeaderValues(old_headers, new_headers, "content-length");
 109
 110   CopyHeaderValues(old_headers, new_headers, "proxy-authenticate");
 111
 112   response->headers = new_headers;
 113   return true;
 114 }
 115
 116 // static
 117 bool ProxyClientSocket::SanitizeProxyRedirect(HttpResponseInfo* response) {
 118   DCHECK(response && response->headers.get());
 119
 120   std::string location;
 121   if (!response->headers->IsRedirect(&location))
 122     return false;
 123
 124   // Return minimal headers; set "Content-Length: 0" to ignore response body.
 125   std::string fake_response_headers = base::StringPrintf(
 126       "HTTP/1.0 302 Found\n"
 127       "Location: %s\n"
 128       "Content-Length: 0\n"
 129       "Connection: close\n"
 130       "\n",
 131       location.c_str());
 132   std::string raw_headers =
 133       HttpUtil::AssembleRawHeaders(fake_response_headers.data(),
 134                                    fake_response_headers.length());
 135   response->headers = new HttpResponseHeaders(raw_headers);
 136
 137   return true;
 138 }
 139
 140 }  // namespace net