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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef REMOTING_PROTOCOL_THIRD_PARTY_HOST_AUTHENTICATOR_H_
#define REMOTING_PROTOCOL_THIRD_PARTY_HOST_AUTHENTICATOR_H_
#include <string>
#include "base/callback.h"
#include "base/memory/scoped_ptr.h"
#include "remoting/protocol/third_party_authenticator_base.h"
#include "url/gurl.h"
namespace remoting {
class RsaKeyPair;
namespace protocol {
// Implements the host side of the third party authentication mechanism.
// The host authenticator sends the |token_url| and |scope| obtained from the
// |TokenValidator| to the client, and expects a |token| in response.
// Once that token is received, it calls |TokenValidator| asynchronously to
// validate it, and exchange it for a |shared_secret|. Once the |TokenValidator|
// returns, the host uses the |shared_secret| to create an underlying
// |V2Authenticator|, which is used to establish the encrypted connection.
class ThirdPartyHostAuthenticator : public ThirdPartyAuthenticatorBase {
public:
class TokenValidator {
public:
// Callback passed to |ValidateThirdPartyToken|, and called once the host
// authentication finishes. |shared_secret| should be used by the host to
// create a V2Authenticator. In case of failure, the callback is called with
// an empty |shared_secret|.
typedef base::Callback<void(
const std::string& shared_secret)> TokenValidatedCallback;
virtual ~TokenValidator() {}
// Validates |token| with the server and exchanges it for a |shared_secret|.
// |token_validated_callback| is called when the host authentication ends,
// in the same thread |ValidateThirdPartyToken| was originally called.
// The request is canceled if this object is destroyed.
virtual void ValidateThirdPartyToken(
const std::string& token,
const TokenValidatedCallback& token_validated_callback) = 0;
// URL sent to the client, to be used by its |TokenFetcher| to get a token.
virtual const GURL& token_url() const = 0;
// Space-separated list of connection attributes the host must send to the
// client, and require the token received in response to match.
virtual const std::string& token_scope() const = 0;
};
class TokenValidatorFactory {
public:
virtual ~TokenValidatorFactory() {}
// Creates a TokenValidator. |local_jid| and |remote_jid| are used to create
// a token scope that is restricted to the current connection's JIDs.
virtual scoped_ptr<TokenValidator> CreateTokenValidator(
const std::string& local_jid,
const std::string& remote_jid) = 0;
};
// Creates a third-party host authenticator. |local_cert| and |key_pair| are
// used by the underlying V2Authenticator to create the SSL channels.
// |token_validator| contains the token parameters to be sent to the client
// and is used to obtain the shared secret.
ThirdPartyHostAuthenticator(const std::string& local_cert,
scoped_refptr<RsaKeyPair> key_pair,
scoped_ptr<TokenValidator> token_validator);
virtual ~ThirdPartyHostAuthenticator();
protected:
// ThirdPartyAuthenticator implementation.
virtual void ProcessTokenMessage(
const buzz::XmlElement* message,
const base::Closure& resume_callback) OVERRIDE;
virtual void AddTokenElements(buzz::XmlElement* message) OVERRIDE;
private:
void OnThirdPartyTokenValidated(const buzz::XmlElement* message,
const base::Closure& resume_callback,
const std::string& shared_secret);
std::string local_cert_;
scoped_refptr<RsaKeyPair> key_pair_;
scoped_ptr<TokenValidator> token_validator_;
DISALLOW_COPY_AND_ASSIGN(ThirdPartyHostAuthenticator);
};
} // namespace protocol
} // namespace remoting
#endif // REMOTING_PROTOCOL_THIRD_PARTY_HOST_AUTHENTICATOR_H_
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