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// Copyright 2016 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_SPAKE2_AUTHENTICATOR_H_
#define REMOTING_PROTOCOL_SPAKE2_AUTHENTICATOR_H_
#include <queue>
#include <string>
#include "base/compiler_specific.h"
#include "base/gtest_prod_util.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "remoting/protocol/authenticator.h"
typedef struct spake2_ctx_st SPAKE2_CTX;
namespace remoting {
class RsaKeyPair;
namespace protocol {
// Authenticator that uses SPAKE2 implementation from BoringSSL. It
// implements SPAKE2 over Curve25519.
class Spake2Authenticator : public Authenticator {
public:
static scoped_ptr<Authenticator> CreateForClient(
const std::string& local_id,
const std::string& remote_id,
const std::string& shared_secret,
State initial_state);
static scoped_ptr<Authenticator> CreateForHost(
const std::string& local_id,
const std::string& remote_id,
const std::string& local_cert,
scoped_refptr<RsaKeyPair> key_pair,
const std::string& shared_secret,
State initial_state);
~Spake2Authenticator() 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;
private:
FRIEND_TEST_ALL_PREFIXES(Spake2AuthenticatorTest, InvalidSecret);
Spake2Authenticator(const std::string& local_id,
const std::string& remote_id,
const std::string& shared_secret,
bool is_host,
State initial_state);
virtual void ProcessMessageInternal(const buzz::XmlElement* message);
std::string CalculateVerificationHash(bool from_host,
const std::string& local_id,
const std::string& remote_id);
const std::string local_id_;
const std::string remote_id_;
const std::string shared_secret_;
const bool is_host_;
// Used only for host authenticators.
std::string local_cert_;
scoped_refptr<RsaKeyPair> local_key_pair_;
// Used only for client authenticators.
std::string remote_cert_;
// Used for both host and client authenticators.
SPAKE2_CTX* spake2_context_;
State state_;
bool started_ = false;
RejectionReason rejection_reason_ = INVALID_CREDENTIALS;
std::string local_spake_message_;
bool spake_message_sent_ = false;
std::string outgoing_verification_hash_;
std::string auth_key_;
std::string expected_verification_hash_;
DISALLOW_COPY_AND_ASSIGN(Spake2Authenticator);
};
} // namespace protocol
} // namespace remoting
#endif // REMOTING_PROTOCOL_SPAKE2_AUTHENTICATOR_H_