net/http/http_auth_handler_basic.cc

   1 // Copyright (c) 2011 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_auth_handler_basic.h"
   6
   7 #include <string>
   8
   9 #include "base/base64.h"
  10 #include "base/strings/string_util.h"
  11 #include "base/strings/utf_string_conversions.h"
  12 #include "net/base/net_errors.h"
  13 #include "net/base/net_string_util.h"
  14 #include "net/http/http_auth.h"
  15 #include "net/http/http_auth_challenge_tokenizer.h"
  16
  17 namespace net {
  18
  19 namespace {
  20
  21 // Parses a realm from an auth challenge, and converts to UTF8-encoding.
  22 // Returns whether the realm is invalid or the parameters are invalid.
  23 //
  24 // Note that if a realm was not specified, we will default it to "";
  25 // so specifying 'Basic realm=""' is equivalent to 'Basic'.
  26 //
  27 // This is more generous than RFC 2617, which is pretty clear in the
  28 // production of challenge that realm is required.
  29 //
  30 // We allow it to be compatibility with certain embedded webservers that don't
  31 // include a realm (see http://crbug.com/20984.)
  32 //
  33 // The over-the-wire realm is encoded as ISO-8859-1 (aka Latin-1).
  34 //
  35 // TODO(cbentzel): Realm may need to be decoded using RFC 2047 rules as
  36 // well, see http://crbug.com/25790.
  37 bool ParseRealm(const HttpAuthChallengeTokenizer& tokenizer,
  38                 std::string* realm) {
  39   CHECK(realm);
  40   realm->clear();
  41   HttpUtil::NameValuePairsIterator parameters = tokenizer.param_pairs();
  42   while (parameters.GetNext()) {
  43     if (!LowerCaseEqualsASCII(parameters.name(), "realm"))
  44       continue;
  45
  46     if (!net::ConvertLatin1ToUtf8AndNormalize(parameters.value(), realm))
  47       return false;
  48   }
  49   return parameters.valid();
  50 }
  51
  52 }  // namespace
  53
  54 bool HttpAuthHandlerBasic::Init(HttpAuthChallengeTokenizer* challenge) {
  55   auth_scheme_ = HttpAuth::AUTH_SCHEME_BASIC;
  56   score_ = 1;
  57   properties_ = 0;
  58   return ParseChallenge(challenge);
  59 }
  60
  61 bool HttpAuthHandlerBasic::ParseChallenge(
  62     HttpAuthChallengeTokenizer* challenge) {
  63   // Verify the challenge's auth-scheme.
  64   if (!LowerCaseEqualsASCII(challenge->scheme(), "basic"))
  65     return false;
  66
  67   std::string realm;
  68   if (!ParseRealm(*challenge, &realm))
  69     return false;
  70
  71   realm_ = realm;
  72   return true;
  73 }
  74
  75 HttpAuth::AuthorizationResult HttpAuthHandlerBasic::HandleAnotherChallenge(
  76     HttpAuthChallengeTokenizer* challenge) {
  77   // Basic authentication is always a single round, so any responses
  78   // should be treated as a rejection.  However, if the new challenge
  79   // is for a different realm, then indicate the realm change.
  80   std::string realm;
  81   if (!ParseRealm(*challenge, &realm))
  82     return HttpAuth::AUTHORIZATION_RESULT_INVALID;
  83   return (realm_ != realm)?
  84       HttpAuth::AUTHORIZATION_RESULT_DIFFERENT_REALM:
  85       HttpAuth::AUTHORIZATION_RESULT_REJECT;
  86 }
  87
  88 int HttpAuthHandlerBasic::GenerateAuthTokenImpl(
  89     const AuthCredentials* credentials, const HttpRequestInfo*,
  90     const CompletionCallback&, std::string* auth_token) {
  91   DCHECK(credentials);
  92   // TODO(eroman): is this the right encoding of username/password?
  93   std::string base64_username_password;
  94   base::Base64Encode(base::UTF16ToUTF8(credentials->username()) + ":" +
  95                          base::UTF16ToUTF8(credentials->password()),
  96                      &base64_username_password);
  97   *auth_token = "Basic " + base64_username_password;
  98   return OK;
  99 }
 100
 101 HttpAuthHandlerBasic::Factory::Factory() {
 102 }
 103
 104 HttpAuthHandlerBasic::Factory::~Factory() {
 105 }
 106
 107 int HttpAuthHandlerBasic::Factory::CreateAuthHandler(
 108     HttpAuthChallengeTokenizer* challenge,
 109     HttpAuth::Target target,
 110     const GURL& origin,
 111     CreateReason reason,
 112     int digest_nonce_count,
 113     const BoundNetLog& net_log,
 114     scoped_ptr<HttpAuthHandler>* handler) {
 115   // TODO(cbentzel): Move towards model of parsing in the factory
 116   //                 method and only constructing when valid.
 117   scoped_ptr<HttpAuthHandler> tmp_handler(new HttpAuthHandlerBasic());
 118   if (!tmp_handler->InitFromChallenge(challenge, target, origin, net_log))
 119     return ERR_INVALID_RESPONSE;
 120   handler->swap(tmp_handler);
 121   return OK;
 122 }
 123
 124 }  // namespace net