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      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 #ifndef REMOTING_PROTOCOL_THIRD_PARTY_AUTHENTICATOR_BASE_H_
      6 #define REMOTING_PROTOCOL_THIRD_PARTY_AUTHENTICATOR_BASE_H_
      7 
      8 #include <string>
      9 
     10 #include "base/callback.h"
     11 #include "base/memory/scoped_ptr.h"
     12 #include "remoting/protocol/authenticator.h"
     13 #include "third_party/libjingle/source/talk/xmllite/qname.h"
     14 
     15 namespace buzz {
     16 
     17 class XmlElement;
     18 
     19 }  // namespace buzz
     20 
     21 namespace remoting {
     22 namespace protocol {
     23 
     24 // Implements an authentication method that relies on a third party server for
     25 // authentication of both client and host.
     26 // When third party authentication is being used, the client must request both a
     27 // token and a shared secret from a third-party server (which may require the
     28 // user to authenticate themselves). The client then sends only the token to the
     29 // host. The host signs the token, then contacts the third-party server to
     30 // exchange the token for the shared secret. Once both client and host have the
     31 // shared secret, they use an underlying |V2Authenticator| (SPAKE2) to negotiate
     32 // an authentication key, which is used to establish the connection.
     33 class ThirdPartyAuthenticatorBase : public Authenticator {
     34  public:
     35   virtual ~ThirdPartyAuthenticatorBase();
     36 
     37   // Authenticator interface.
     38   virtual State state() const OVERRIDE;
     39   virtual RejectionReason rejection_reason() const OVERRIDE;
     40   virtual void ProcessMessage(const buzz::XmlElement* message,
     41                               const base::Closure& resume_callback) OVERRIDE;
     42   virtual scoped_ptr<buzz::XmlElement> GetNextMessage() OVERRIDE;
     43   virtual scoped_ptr<ChannelAuthenticator>
     44       CreateChannelAuthenticator() const OVERRIDE;
     45 
     46  protected:
     47   // XML tag names for third party authentication fields.
     48   static const buzz::StaticQName kTokenUrlTag;
     49   static const buzz::StaticQName kTokenScopeTag;
     50   static const buzz::StaticQName kTokenTag;
     51 
     52   explicit ThirdPartyAuthenticatorBase(State initial_state);
     53 
     54   // Gives the message to the underlying authenticator for processing.
     55   void ProcessUnderlyingMessage(
     56       const buzz::XmlElement* message,
     57       const base::Closure& resume_callback);
     58 
     59   // Processes the token-related elements of the message.
     60   virtual void ProcessTokenMessage(
     61       const buzz::XmlElement* message,
     62       const base::Closure& resume_callback) = 0;
     63 
     64   // Adds the token related XML elements to the message.
     65   virtual void AddTokenElements(buzz::XmlElement* message) = 0;
     66 
     67   scoped_ptr<Authenticator> underlying_;
     68   State token_state_;
     69   RejectionReason rejection_reason_;
     70 
     71  private:
     72   DISALLOW_COPY_AND_ASSIGN(ThirdPartyAuthenticatorBase);
     73 };
     74 
     75 }  // namespace protocol
     76 }  // namespace remoting
     77 
     78 #endif  // REMOTING_PROTOCOL_THIRD_PARTY_AUTHENTICATOR_BASE_H_
     79