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 (!base::LowerCaseEqualsASCII(parameters.name(), "realm"))
  44       continue;
  45
  46     if (!ConvertToUtf8AndNormalize(parameters.value(), kCharsetLatin1, realm)) {
  47       return false;
  48     }
  49   }
  50   return parameters.valid();
  51 }
  52
  53 }  // namespace
  54
  55 bool HttpAuthHandlerBasic::Init(HttpAuthChallengeTokenizer* challenge) {
  56   auth_scheme_ = HttpAuth::AUTH_SCHEME_BASIC;
  57   score_ = 1;
  58   properties_ = 0;
  59   return ParseChallenge(challenge);
  60 }
  61
  62 bool HttpAuthHandlerBasic::ParseChallenge(
  63     HttpAuthChallengeTokenizer* challenge) {
  64   // Verify the challenge's auth-scheme.
  65   if (!base::LowerCaseEqualsASCII(challenge->scheme(), "basic"))
  66     return false;
  67
  68   std::string realm;
  69   if (!ParseRealm(*challenge, &realm))
  70     return false;
  71
  72   realm_ = realm;
  73   return true;
  74 }
  75
  76 HttpAuth::AuthorizationResult HttpAuthHandlerBasic::HandleAnotherChallenge(
  77     HttpAuthChallengeTokenizer* challenge) {
  78   // Basic authentication is always a single round, so any responses
  79   // should be treated as a rejection.  However, if the new challenge
  80   // is for a different realm, then indicate the realm change.
  81   std::string realm;
  82   if (!ParseRealm(*challenge, &realm))
  83     return HttpAuth::AUTHORIZATION_RESULT_INVALID;
  84   return (realm_ != realm)?
  85       HttpAuth::AUTHORIZATION_RESULT_DIFFERENT_REALM:
  86       HttpAuth::AUTHORIZATION_RESULT_REJECT;
  87 }
  88
  89 int HttpAuthHandlerBasic::GenerateAuthTokenImpl(
  90     const AuthCredentials* credentials, const HttpRequestInfo*,
  91     const CompletionCallback&, std::string* auth_token) {
  92   DCHECK(credentials);
  93   // TODO(eroman): is this the right encoding of username/password?
  94   std::string base64_username_password;
  95   base::Base64Encode(base::UTF16ToUTF8(credentials->username()) + ":" +
  96                          base::UTF16ToUTF8(credentials->password()),
  97                      &base64_username_password);
  98   *auth_token = "Basic " + base64_username_password;
  99   return OK;
 100 }
 101
 102 HttpAuthHandlerBasic::Factory::Factory() {
 103 }
 104
 105 HttpAuthHandlerBasic::Factory::~Factory() {
 106 }
 107
 108 int HttpAuthHandlerBasic::Factory::CreateAuthHandler(
 109     HttpAuthChallengeTokenizer* challenge,
 110     HttpAuth::Target target,
 111     const GURL& origin,
 112     CreateReason reason,
 113     int digest_nonce_count,
 114     const BoundNetLog& net_log,
 115     scoped_ptr<HttpAuthHandler>* handler) {
 116   // TODO(cbentzel): Move towards model of parsing in the factory
 117   //                 method and only constructing when valid.
 118   scoped_ptr<HttpAuthHandler> tmp_handler(new HttpAuthHandlerBasic());
 119   if (!tmp_handler->InitFromChallenge(challenge, target, origin, net_log))
 120     return ERR_INVALID_RESPONSE;
 121   handler->swap(tmp_handler);
 122   return OK;
 123 }
 124
 125 }  // namespace net