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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_AUTHENTICATOR_BASE_H_
#define REMOTING_PROTOCOL_THIRD_PARTY_AUTHENTICATOR_BASE_H_
#include <string>
#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "remoting/protocol/authenticator.h"
#include "third_party/webrtc/libjingle/xmllite/qname.h"
namespace buzz {
class XmlElement;
} // namespace buzz
namespace remoting {
namespace protocol {
// Implements an authentication method that relies on a third party server for
// authentication of both client and host.
// When third party authentication is being used, the client must request both a
// token and a shared secret from a third-party server (which may require the
// user to authenticate themselves). The client then sends only the token to the
// host. The host signs the token, then contacts the third-party server to
// exchange the token for the shared secret. Once both client and host have the
// shared secret, they use an underlying |V2Authenticator| (SPAKE2) to negotiate
// an authentication key, which is used to establish the connection.
class ThirdPartyAuthenticatorBase : public Authenticator {
public:
~ThirdPartyAuthenticatorBase() override;
// Authenticator interface.
State state() const override;
bool started() const override;
RejectionReason rejection_reason() const override;
void ProcessMessage(const buzz::XmlElement* message,
const base::Closure& resume_callback) override;
scoped_ptr<buzz::XmlElement> GetNextMessage() override;
const std::string& GetAuthKey() const override;
scoped_ptr<ChannelAuthenticator> CreateChannelAuthenticator() const override;
protected:
// XML tag names for third party authentication fields.
static const buzz::StaticQName kTokenUrlTag;
static const buzz::StaticQName kTokenScopeTag;
static const buzz::StaticQName kTokenTag;
explicit ThirdPartyAuthenticatorBase(State initial_state);
// Gives the message to the underlying authenticator for processing.
void ProcessUnderlyingMessage(
const buzz::XmlElement* message,
const base::Closure& resume_callback);
// Processes the token-related elements of the message.
virtual void ProcessTokenMessage(
const buzz::XmlElement* message,
const base::Closure& resume_callback) = 0;
// Adds the token related XML elements to the message.
virtual void AddTokenElements(buzz::XmlElement* message) = 0;
scoped_ptr<Authenticator> underlying_;
State token_state_;
bool started_;
RejectionReason rejection_reason_;
private:
DISALLOW_COPY_AND_ASSIGN(ThirdPartyAuthenticatorBase);
};
} // namespace protocol
} // namespace remoting
#endif // REMOTING_PROTOCOL_THIRD_PARTY_AUTHENTICATOR_BASE_H_
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