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/protocol/pairing_client_authenticator.h" 6 7#include "base/bind.h" 8#include "base/logging.h" 9#include "remoting/base/constants.h" 10#include "remoting/base/rsa_key_pair.h" 11#include "remoting/protocol/authentication_method.h" 12#include "remoting/protocol/channel_authenticator.h" 13#include "remoting/protocol/v2_authenticator.h" 14#include "third_party/webrtc/libjingle/xmllite/xmlelement.h" 15 16namespace remoting { 17namespace protocol { 18 19PairingClientAuthenticator::PairingClientAuthenticator( 20 const std::string& client_id, 21 const std::string& paired_secret, 22 const FetchSecretCallback& fetch_pin_callback, 23 const std::string& authentication_tag) 24 : sent_client_id_(false), 25 client_id_(client_id), 26 paired_secret_(paired_secret), 27 fetch_pin_callback_(fetch_pin_callback), 28 authentication_tag_(authentication_tag), 29 weak_factory_(this) { 30 v2_authenticator_ = V2Authenticator::CreateForClient( 31 paired_secret_, MESSAGE_READY); 32 using_paired_secret_ = true; 33} 34 35PairingClientAuthenticator::~PairingClientAuthenticator() { 36} 37 38void PairingClientAuthenticator::CreateV2AuthenticatorWithPIN( 39 State initial_state, 40 const SetAuthenticatorCallback& set_authenticator_callback) { 41 SecretFetchedCallback callback = base::Bind( 42 &PairingClientAuthenticator::OnPinFetched, 43 weak_factory_.GetWeakPtr(), initial_state, set_authenticator_callback); 44 fetch_pin_callback_.Run(true, callback); 45} 46 47void PairingClientAuthenticator::AddPairingElements(buzz::XmlElement* message) { 48 // If the client id and secret have not yet been sent, do so now. Note that 49 // in this case the V2Authenticator is being used optimistically to send the 50 // first message of the SPAKE exchange since we don't yet know whether or not 51 // the host will accept the client id or request that we fall back to the PIN. 52 if (!sent_client_id_) { 53 buzz::XmlElement* pairing_tag = new buzz::XmlElement(kPairingInfoTag); 54 pairing_tag->AddAttr(kClientIdAttribute, client_id_); 55 message->AddElement(pairing_tag); 56 sent_client_id_ = true; 57 } 58} 59 60void PairingClientAuthenticator::OnPinFetched( 61 State initial_state, 62 const SetAuthenticatorCallback& callback, 63 const std::string& pin) { 64 callback.Run(V2Authenticator::CreateForClient( 65 AuthenticationMethod::ApplyHashFunction( 66 AuthenticationMethod::HMAC_SHA256, 67 authentication_tag_, pin), 68 initial_state)); 69} 70 71} // namespace protocol 72} // namespace remoting 73