remoting/host/token_validator_factory_impl.cc

   1 // Copyright 2013 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 "remoting/host/token_validator_factory_impl.h"
   6
   7 #include "base/base64.h"
   8 #include "base/bind.h"
   9 #include "base/callback.h"
  10 #include "base/json/json_reader.h"
  11 #include "base/logging.h"
  12 #include "base/single_thread_task_runner.h"
  13 #include "base/strings/string_util.h"
  14 #include "base/values.h"
  15 #include "crypto/random.h"
  16 #include "net/base/elements_upload_data_stream.h"
  17 #include "net/base/escape.h"
  18 #include "net/base/io_buffer.h"
  19 #include "net/base/request_priority.h"
  20 #include "net/base/upload_bytes_element_reader.h"
  21 #include "net/url_request/url_request.h"
  22 #include "net/url_request/url_request_context.h"
  23 #include "net/url_request/url_request_status.h"
  24 #include "remoting/base/rsa_key_pair.h"
  25 #include "remoting/host/token_validator_base.h"
  26 #include "url/gurl.h"
  27
  28 namespace {
  29
  30 // Length in bytes of the cryptographic nonce used to salt the token scope.
  31 const size_t kNonceLength = 16;  // 128 bits.
  32
  33 }  // namespace
  34
  35 namespace remoting {
  36
  37
  38 class TokenValidatorImpl : public TokenValidatorBase {
  39  public:
  40   TokenValidatorImpl(
  41       const ThirdPartyAuthConfig& third_party_auth_config,
  42       scoped_refptr<RsaKeyPair> key_pair,
  43       const std::string& local_jid,
  44       const std::string& remote_jid,
  45       scoped_refptr<net::URLRequestContextGetter> request_context_getter);
  46
  47  protected:
  48   void StartValidateRequest(const std::string& token) override;
  49
  50  private:
  51   static std::string CreateScope(const std::string& local_jid,
  52                                  const std::string& remote_jid);
  53
  54   std::string post_body_;
  55   scoped_refptr<RsaKeyPair> key_pair_;
  56
  57   DISALLOW_COPY_AND_ASSIGN(TokenValidatorImpl);
  58 };
  59
  60 TokenValidatorImpl::TokenValidatorImpl(
  61     const ThirdPartyAuthConfig& third_party_auth_config,
  62     scoped_refptr<RsaKeyPair> key_pair,
  63     const std::string& local_jid,
  64     const std::string& remote_jid,
  65     scoped_refptr<net::URLRequestContextGetter> request_context_getter)
  66     : TokenValidatorBase(third_party_auth_config,
  67                          CreateScope(local_jid, remote_jid),
  68                          request_context_getter),
  69       key_pair_(key_pair) {
  70   DCHECK(key_pair_.get());
  71   token_scope_ = CreateScope(local_jid, remote_jid);
  72 }
  73
  74 // TokenValidator interface.
  75 void TokenValidatorImpl::StartValidateRequest(const std::string& token) {
  76   post_body_ = "code=" + net::EscapeUrlEncodedData(token, true) +
  77       "&client_id=" + net::EscapeUrlEncodedData(
  78           key_pair_->GetPublicKey(), true) +
  79       "&client_secret=" + net::EscapeUrlEncodedData(
  80           key_pair_->SignMessage(token), true) +
  81       "&grant_type=authorization_code";
  82
  83   request_ = request_context_getter_->GetURLRequestContext()->CreateRequest(
  84       third_party_auth_config_.token_validation_url, net::DEFAULT_PRIORITY,
  85       this);
  86   request_->SetExtraRequestHeaderByName(
  87       net::HttpRequestHeaders::kContentType,
  88       "application/x-www-form-urlencoded", true);
  89   request_->set_method("POST");
  90   scoped_ptr<net::UploadElementReader> reader(
  91       new net::UploadBytesElementReader(
  92           post_body_.data(), post_body_.size()));
  93   request_->set_upload(
  94       net::ElementsUploadDataStream::CreateWithReader(reader.Pass(), 0));
  95   request_->Start();
  96 }
  97
  98 std::string TokenValidatorImpl::CreateScope(
  99     const std::string& local_jid,
 100     const std::string& remote_jid) {
 101   std::string nonce_bytes;
 102   crypto::RandBytes(WriteInto(&nonce_bytes, kNonceLength + 1), kNonceLength);
 103   std::string nonce;
 104   base::Base64Encode(nonce_bytes, &nonce);
 105   return "client:" + remote_jid + " host:" + local_jid + " nonce:" + nonce;
 106 }
 107
 108 TokenValidatorFactoryImpl::TokenValidatorFactoryImpl(
 109     const ThirdPartyAuthConfig& third_party_auth_config,
 110     scoped_refptr<RsaKeyPair> key_pair,
 111     scoped_refptr<net::URLRequestContextGetter> request_context_getter)
 112     : third_party_auth_config_(third_party_auth_config),
 113       key_pair_(key_pair),
 114       request_context_getter_(request_context_getter) {
 115 }
 116
 117 TokenValidatorFactoryImpl::~TokenValidatorFactoryImpl() {
 118 }
 119
 120 scoped_ptr<protocol::TokenValidator>
 121 TokenValidatorFactoryImpl::CreateTokenValidator(
 122     const std::string& local_jid,
 123     const std::string& remote_jid) {
 124   return make_scoped_ptr(
 125       new TokenValidatorImpl(third_party_auth_config_,
 126                              key_pair_, local_jid, remote_jid,
 127                              request_context_getter_));
 128 }
 129
 130 }  // namespace remoting