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/*
* TLS Channel
* (C) 2011,2012 Jack Lloyd
*
* Released under the terms of the Botan license
*/
#ifndef BOTAN_TLS_CHANNEL_H__
#define BOTAN_TLS_CHANNEL_H__
#include <botan/tls_policy.h>
#include <botan/tls_record.h>
#include <botan/tls_session.h>
#include <botan/tls_alert.h>
#include <botan/tls_session_manager.h>
#include <botan/x509cert.h>
#include <vector>
#include <string>
#include <memory>
namespace Botan {
namespace TLS {
/**
* Generic interface for TLS endpoint
*/
class BOTAN_DLL Channel
{
public:
/**
* Inject TLS traffic received from counterparty
* @return a hint as the how many more bytes we need to process the
* current record (this may be 0 if on a record boundary)
*/
virtual size_t received_data(const byte buf[], size_t buf_size);
/**
* Inject plaintext intended for counterparty
*/
void send(const byte buf[], size_t buf_size);
/**
* Inject plaintext intended for counterparty
*/
void send(const std::string& string);
/**
* Send a close notification alert
*/
void close() { send_alert(Alert(Alert::CLOSE_NOTIFY)); }
/**
* @return true iff the connection is active for sending application data
*/
bool is_active() const { return m_handshake_completed && !is_closed(); }
/**
* @return true iff the connection has been definitely closed
*/
bool is_closed() const { return m_connection_closed; }
/**
* Attempt to renegotiate the session
* @param force_full_renegotiation if true, require a full renegotiation,
* otherwise allow session resumption
*/
virtual void renegotiate(bool force_full_renegotiation = false) = 0;
/**
* Attempt to send a heartbeat message (if negotiated with counterparty)
* @param payload will be echoed back
* @param payload_size size of payload in bytes
*/
void heartbeat(const byte payload[], size_t payload_size);
/**
* Attempt to send a heartbeat message (if negotiated with counterparty)
*/
void heartbeat() { heartbeat(nullptr, 0); }
/**
* @return certificate chain of the peer (may be empty)
*/
std::vector<X509_Certificate> peer_cert_chain() const { return m_peer_certs; }
Channel(std::function<void (const byte[], size_t)> socket_output_fn,
std::function<void (const byte[], size_t, Alert)> proc_fn,
std::function<bool (const Session&)> handshake_complete,
Session_Manager& session_manager,
RandomNumberGenerator& rng);
Channel(const Channel&) = delete;
Channel& operator=(const Channel&) = delete;
virtual ~Channel();
protected:
/**
* Send a TLS alert message. If the alert is fatal, the internal
* state (keys, etc) will be reset.
* @param alert the Alert to send
*/
void send_alert(const Alert& alert);
virtual void process_handshake_msg(Handshake_Type type,
const std::vector<byte>& contents) = 0;
virtual void alert_notify(const Alert& alert) = 0;
virtual class Handshake_State* new_handshake_state() = 0;
class Secure_Renegotiation_State
{
public:
Secure_Renegotiation_State() : m_initial_handshake(true),
m_secure_renegotiation(false)
{}
void update(const class Client_Hello* client_hello);
void update(const class Server_Hello* server_hello);
void update(const class Finished* client_finished,
const class Finished* server_finished);
const std::vector<byte>& for_client_hello() const
{ return m_client_verify; }
std::vector<byte> for_server_hello() const
{
std::vector<byte> buf = m_client_verify;
buf += m_server_verify;
return buf;
}
bool supported() const
{ return m_secure_renegotiation; }
bool initial_handshake() const { return m_initial_handshake; }
private:
bool m_initial_handshake;
bool m_secure_renegotiation;
std::vector<byte> m_client_verify, m_server_verify;
};
std::function<void (const byte[], size_t, Alert)> m_proc_fn;
std::function<bool (const Session&)> m_handshake_fn;
std::unique_ptr<class Handshake_State> m_state;
Session_Manager& m_session_manager;
Record_Writer m_writer;
Record_Reader m_reader;
std::vector<X509_Certificate> m_peer_certs;
Secure_Renegotiation_State m_secure_renegotiation;
std::vector<byte> m_active_session;
bool m_handshake_completed;
bool m_connection_closed;
bool m_peer_supports_heartbeats;
bool m_heartbeat_sending_allowed;
};
}
}
#endif
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