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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 version 3 as
* published by the Free Software Foundation.
*
* 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"
#ifndef NOCRYPT
#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>
#define KD_LABEL_COUNT 3
typedef enum {
LABEL_SATP_ENCRYPTION = 0x00,
LABEL_SATP_MSG_AUTH = 0x01,
LABEL_SATP_SALT = 0x02,
} satp_prf_label_t;
typedef enum {
KD_INBOUND = 0,
KD_OUTBOUND = 1
} kd_dir_t;
typedef struct {
Buffer key_;
seq_nr_t r_;
} key_store_t;
class KeyDerivation
{
public:
KeyDerivation() : ld_kdr_(0), key_length_(0), master_salt_(0), master_key_(0) {};
KeyDerivation(u_int16_t key_length) : ld_kdr_(0), key_length_(key_length), master_salt_(0), master_key_(0) {};
virtual ~KeyDerivation() {};
void setLogKDRate(const int8_t ld_rate);
virtual void init(Buffer key, Buffer salt) = 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"; };
protected:
virtual void updateMasterKey() = 0;
KeyDerivation(const KeyDerivation & src);
friend class boost::serialization::access;
template<class Archive>
void serialize(Archive & ar, const unsigned int version)
{
WritersLock lock(mutex_);
ar & ld_kdr_;
ar & key_length_;
ar & master_salt_;
ar & master_key_;
updateMasterKey();
}
int8_t ld_kdr_; // ld(key_derivation_rate)
u_int16_t key_length_;
SyncBuffer master_salt_;
SyncBuffer master_key_;
SharedMutex mutex_;
};
BOOST_IS_ABSTRACT(KeyDerivation)
//****** NullKeyDerivation ******
class NullKeyDerivation : public KeyDerivation
{
public:
NullKeyDerivation() {};
~NullKeyDerivation() {};
void init(Buffer key, Buffer salt) {};
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 NOCRYPT
//****** 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);
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, seq_nr_t* r, 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
key_store_t key_store_[2][KD_LABEL_COUNT];
union __attribute__((__packed__)) key_derivation_aesctr_ctr_union {
u_int8_t buf_[CTR_LENGTH];
struct __attribute__ ((__packed__)) {
u_int8_t buf_[SALT_LENGTH];
u_int16_t zero_;
} salt_;
#ifndef ANYTUN_02_COMPAT
struct __attribute__((__packed__)) {
u_int8_t fill_[SALT_LENGTH - sizeof(u_int8_t) - sizeof(seq_nr_t)];
u_int8_t label_;
seq_nr_t r_;
u_int16_t zero_;
} params_;
#else
struct __attribute__((__packed__)) {
u_int8_t fill_[SALT_LENGTH - sizeof(u_int8_t) - 2 - sizeof(seq_nr_t)];
u_int8_t label_;
u_int8_t r_fill_[2];
seq_nr_t r_;
u_int16_t zero_;
} params_;
#endif
} ctr_[2];
};
#endif
#endif
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