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/*
* anytun
*
* The secure anycast tunneling protocol (satp) defines a protocol used
* for communication between any combination of unicast and anycast
* tunnel endpoints. It has less protocol overhead than IPSec in Tunnel
* mode and allows tunneling of every ETHER TYPE protocol (e.g.
* ethernet, ip, arp ...). satp directly includes cryptography and
* message authentication based on the methodes used by SRTP. It is
* intended to deliver a generic, scaleable and secure solution for
* tunneling and relaying of packets of any protocol.
*
*
* Copyright (C) 2007-2008 Othmar Gsenger, Erwin Nindl,
* Christian Pointner <satp@wirdorange.org>
*
* This file is part of Anytun.
*
* Anytun is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* Anytun is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with anytun. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _KEYDERIVATION_H_
#define _KEYDERIVATION_H_
#include "datatypes.h"
#include "buffer.h"
#include "threadUtils.hpp"
#include "syncBuffer.h"
#include "options.h"
#ifndef NO_CRYPT
#ifndef USE_SSL_CRYPTO
#include <gcrypt.h>
#else
#include <openssl/aes.h>
#endif
#endif
#include <boost/archive/text_oarchive.hpp>
#include <boost/archive/text_iarchive.hpp>
#include <boost/version.hpp>
#define LABEL_ENC 0
#define LABEL_AUTH 1
#define LABEL_SALT 2
#define LABEL_LEFT_ENC 0x356A192B
#define LABEL_RIGHT_ENC 0xDA4B9237
#define LABEL_LEFT_SALT 0x77DE68DA
#define LABEL_RIGHT_SALT 0x1B645389
#define LABEL_LEFT_AUTH 0xAC3478D6
#define LABEL_RIGHT_AUTH 0xC1DFD96E
typedef enum { KD_INBOUND, KD_OUTBOUND } kd_dir_t;
class KeyDerivation
{
public:
KeyDerivation() : is_initialized_(false), role_(ROLE_LEFT), key_length_(0), master_salt_(0), master_key_(0) {};
KeyDerivation(u_int16_t key_length) : is_initialized_(false), role_(ROLE_LEFT), key_length_(key_length), master_salt_(0), master_key_(0) {};
virtual ~KeyDerivation() {};
void setRole(const role_t role);
virtual void init(Buffer key, Buffer salt, std::string passphrase = "") = 0;
virtual bool generate(kd_dir_t dir, satp_prf_label_t label, seq_nr_t seq_nr, Buffer& key) = 0;
virtual std::string printType() { return "GenericKeyDerivation"; };
satp_prf_label_t convertLabel(kd_dir_t dir, satp_prf_label_t label);
protected:
virtual void updateMasterKey() = 0;
#ifndef NO_PASSPHRASE
void calcMasterKey(std::string passphrase, u_int16_t length);
void calcMasterSalt(std::string passphrase, u_int16_t length);
#endif
KeyDerivation(const KeyDerivation & src);
friend class boost::serialization::access;
template<class Archive>
void serialize(Archive & ar, const unsigned int version)
{
WritersLock lock(mutex_);
ar & role_;
ar & key_length_;
ar & master_salt_;
ar & master_key_;
updateMasterKey();
}
bool is_initialized_;
role_t role_;
u_int16_t key_length_;
SyncBuffer master_salt_;
SyncBuffer master_key_;
SharedMutex mutex_;
};
#if BOOST_VERSION <= 103500
BOOST_IS_ABSTRACT(KeyDerivation);
#else
BOOST_SERIALIZATION_ASSUME_ABSTRACT(KeyDerivation);
#endif
//****** NullKeyDerivation ******
class NullKeyDerivation : public KeyDerivation
{
public:
NullKeyDerivation() {};
~NullKeyDerivation() {};
void init(Buffer key, Buffer salt, std::string passphrase = "") {};
bool generate(kd_dir_t dir, satp_prf_label_t label, seq_nr_t seq_nr, Buffer& key);
std::string printType() { return "NullKeyDerivation"; };
private:
void updateMasterKey() {};
friend class boost::serialization::access;
template<class Archive>
void serialize(Archive & ar, const unsigned int version)
{
ar & boost::serialization::base_object<KeyDerivation>(*this);
}
};
#ifndef NO_CRYPT
//****** AesIcmKeyDerivation ******
class AesIcmKeyDerivation : public KeyDerivation
{
public:
AesIcmKeyDerivation();
AesIcmKeyDerivation(u_int16_t key_length);
~AesIcmKeyDerivation();
static const u_int16_t DEFAULT_KEY_LENGTH = 128;
static const u_int16_t CTR_LENGTH = 16;
static const u_int16_t SALT_LENGTH = 14;
void init(Buffer key, Buffer salt, std::string passphrase = "");
bool generate(kd_dir_t dir, satp_prf_label_t label, seq_nr_t seq_nr, Buffer& key);
std::string printType();
private:
void updateMasterKey();
bool calcCtr(kd_dir_t dir, satp_prf_label_t label, seq_nr_t seq_nr);
friend class boost::serialization::access;
template<class Archive>
void serialize(Archive & ar, const unsigned int version)
{
ar & boost::serialization::base_object<KeyDerivation>(*this);
}
#ifndef USE_SSL_CRYPTO
gcry_cipher_hd_t handle_[2];
#else
AES_KEY aes_key_[2];
u_int8_t ecount_buf_[2][AES_BLOCK_SIZE];
#endif
#ifdef _MSC_VER
#pragma pack(push, 1)
#endif
union ATTR_PACKED key_derivation_aesctr_ctr_union {
u_int8_t buf_[CTR_LENGTH];
struct ATTR_PACKED {
u_int8_t buf_[SALT_LENGTH];
u_int16_t zero_;
} salt_;
struct ATTR_PACKED {
u_int8_t fill_[SALT_LENGTH - sizeof(satp_prf_label_t) - sizeof(seq_nr_t)];
satp_prf_label_t label_;
seq_nr_t seq_;
u_int16_t zero_;
} params_;
} ctr_[2];
#ifdef _MSC_VER
#pragma pack(pop)
#endif
};
#endif
#endif
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