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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_HOST_AUTHENTICATOR_H_
      6 #define REMOTING_PROTOCOL_THIRD_PARTY_HOST_AUTHENTICATOR_H_
      7 
      8 #include <string>
      9 
     10 #include "base/callback.h"
     11 #include "base/memory/scoped_ptr.h"
     12 #include "remoting/protocol/third_party_authenticator_base.h"
     13 
     14 namespace remoting {
     15 
     16 class RsaKeyPair;
     17 
     18 namespace protocol {
     19 
     20 class TokenValidator;
     21 
     22 // Implements the host side of the third party authentication mechanism.
     23 // The host authenticator sends the |token_url| and |scope| obtained from the
     24 // |TokenValidator| to the client, and expects a |token| in response.
     25 // Once that token is received, it calls |TokenValidator| asynchronously to
     26 // validate it, and exchange it for a |shared_secret|. Once the |TokenValidator|
     27 // returns, the host uses the |shared_secret| to create an underlying
     28 // |V2Authenticator|, which is used to establish the encrypted connection.
     29 class ThirdPartyHostAuthenticator : public ThirdPartyAuthenticatorBase {
     30  public:
     31   // Creates a third-party host authenticator. |local_cert| and |key_pair| are
     32   // used by the underlying V2Authenticator to create the SSL channels.
     33   // |token_validator| contains the token parameters to be sent to the client
     34   // and is used to obtain the shared secret.
     35   ThirdPartyHostAuthenticator(const std::string& local_cert,
     36                               scoped_refptr<RsaKeyPair> key_pair,
     37                               scoped_ptr<TokenValidator> token_validator);
     38   virtual ~ThirdPartyHostAuthenticator();
     39 
     40  protected:
     41   // ThirdPartyAuthenticator implementation.
     42   virtual void ProcessTokenMessage(
     43       const buzz::XmlElement* message,
     44       const base::Closure& resume_callback) OVERRIDE;
     45   virtual void AddTokenElements(buzz::XmlElement* message) OVERRIDE;
     46 
     47  private:
     48   void OnThirdPartyTokenValidated(const buzz::XmlElement* message,
     49                                   const base::Closure& resume_callback,
     50                                   const std::string& shared_secret);
     51 
     52   std::string local_cert_;
     53   scoped_refptr<RsaKeyPair> key_pair_;
     54   scoped_ptr<TokenValidator> token_validator_;
     55 
     56   DISALLOW_COPY_AND_ASSIGN(ThirdPartyHostAuthenticator);
     57 };
     58 
     59 }  // namespace protocol
     60 }  // namespace remoting
     61 
     62 #endif  // REMOTING_PROTOCOL_THIRD_PARTY_HOST_AUTHENTICATOR_H_
     63