net/http/http_auth_multi_round_parse.cc

   1 // Copyright 2015 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 "base/base64.h"
   6 #include "base/strings/string_util.h"
   7 #include "net/http/http_auth_challenge_tokenizer.h"
   8 #include "net/http/http_auth_multi_round_parse.h"
   9
  10 namespace net {
  11
  12 namespace {
  13
  14 // Check that the scheme in the challenge matches the expected scheme
  15 bool SchemeIsValid(const std::string& scheme,
  16                    HttpAuthChallengeTokenizer* challenge) {
  17   // There is no guarantee that challenge->scheme() is valid ASCII, but
  18   // LowerCaseEqualsASCII will do the right thing even if it isn't.
  19   return base::LowerCaseEqualsASCII(challenge->scheme(),
  20                                     base::StringToLowerASCII(scheme).c_str());
  21 }
  22
  23 }  // namespace
  24
  25 HttpAuth::AuthorizationResult ParseFirstRoundChallenge(
  26     const std::string& scheme,
  27     HttpAuthChallengeTokenizer* challenge) {
  28   // Verify the challenge's auth-scheme.
  29   if (!SchemeIsValid(scheme, challenge))
  30     return HttpAuth::AUTHORIZATION_RESULT_INVALID;
  31
  32   std::string encoded_auth_token = challenge->base64_param();
  33   if (!encoded_auth_token.empty()) {
  34     return HttpAuth::AUTHORIZATION_RESULT_INVALID;
  35   }
  36   return HttpAuth::AUTHORIZATION_RESULT_ACCEPT;
  37 }
  38
  39 HttpAuth::AuthorizationResult ParseLaterRoundChallenge(
  40     const std::string& scheme,
  41     HttpAuthChallengeTokenizer* challenge,
  42     std::string* encoded_token,
  43     std::string* decoded_token) {
  44   // Verify the challenge's auth-scheme.
  45   if (!SchemeIsValid(scheme, challenge))
  46     return HttpAuth::AUTHORIZATION_RESULT_INVALID;
  47
  48   *encoded_token = challenge->base64_param();
  49   if (encoded_token->empty())
  50     return HttpAuth::AUTHORIZATION_RESULT_REJECT;
  51
  52   // Make sure the additional token is base64 encoded.
  53   if (!base::Base64Decode(*encoded_token, decoded_token))
  54     return HttpAuth::AUTHORIZATION_RESULT_INVALID;
  55   return HttpAuth::AUTHORIZATION_RESULT_ACCEPT;
  56 }
  57
  58 }  // namespace net