remoting/protocol/pairing_client_authenticator.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/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
  16 namespace remoting {
  17 namespace protocol {
  18
  19 PairingClientAuthenticator::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
  35 PairingClientAuthenticator::~PairingClientAuthenticator() {
  36 }
  37
  38 void 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
  47 void 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
  60 void 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