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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 bool started() const OVERRIDE;
     40   virtual RejectionReason rejection_reason() const OVERRIDE;
     41   virtual void ProcessMessage(const buzz::XmlElement* message,
     42                               const base::Closure& resume_callback) OVERRIDE;
     43   virtual scoped_ptr<buzz::XmlElement> GetNextMessage() OVERRIDE;
     44   virtual scoped_ptr<ChannelAuthenticator>
     45       CreateChannelAuthenticator() const OVERRIDE;
     46 
     47  protected:
     48   // XML tag names for third party authentication fields.
     49   static const buzz::StaticQName kTokenUrlTag;
     50   static const buzz::StaticQName kTokenScopeTag;
     51   static const buzz::StaticQName kTokenTag;
     52 
     53   explicit ThirdPartyAuthenticatorBase(State initial_state);
     54 
     55   // Gives the message to the underlying authenticator for processing.
     56   void ProcessUnderlyingMessage(
     57       const buzz::XmlElement* message,
     58       const base::Closure& resume_callback);
     59 
     60   // Processes the token-related elements of the message.
     61   virtual void ProcessTokenMessage(
     62       const buzz::XmlElement* message,
     63       const base::Closure& resume_callback) = 0;
     64 
     65   // Adds the token related XML elements to the message.
     66   virtual void AddTokenElements(buzz::XmlElement* message) = 0;
     67 
     68   scoped_ptr<Authenticator> underlying_;
     69   State token_state_;
     70   bool started_;
     71   RejectionReason rejection_reason_;
     72 
     73  private:
     74   DISALLOW_COPY_AND_ASSIGN(ThirdPartyAuthenticatorBase);
     75 };
     76 
     77 }  // namespace protocol
     78 }  // namespace remoting
     79 
     80 #endif  // REMOTING_PROTOCOL_THIRD_PARTY_AUTHENTICATOR_BASE_H_
     81