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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 methods 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) 2007-2014 Markus Grüneis, 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/>.
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*/
#ifndef ANYTUN_crypto_interface_h_INCLUDED
#define ANYTUN_crypto_interface_h_INCLUDED
#include "../datatypes.h"
#include "../options.h"
#include "../buffer.h"
#include "../plainPacket.h"
#include "../encryptedPacket.h"
#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
namespace crypto {
static const uint16_t DEFAULT_KEY_LENGTH = 128;
static const uint16_t CTR_LENGTH = 16;
static const uint16_t SALT_LENGTH = 14;
typedef enum { KD_INBOUND, KD_OUTBOUND } kd_dir_t;
#ifdef _MSC_VER
#pragma pack(push, 1)
#endif
typedef union ATTR_PACKED {
uint8_t buf_[CTR_LENGTH];
struct ATTR_PACKED {
uint8_t buf_[SALT_LENGTH];
uint16_t zero_;
} salt_;
struct ATTR_PACKED {
uint8_t fill_[SALT_LENGTH - sizeof(mux_t) - sizeof(sender_id_t) - 2*sizeof(uint8_t) - sizeof(seq_nr_t)];
mux_t mux_;
sender_id_t sender_id_;
uint8_t empty_[2];
seq_nr_t seq_nr_;
uint16_t zero_;
} params_;
} cipher_aesctr_ctr_t;
#ifdef _MSC_VER
#pragma pack(pop)
#endif
#ifdef _MSC_VER
#pragma pack(push, 1)
#endif
typedef union ATTR_PACKED {
uint8_t buf_[CTR_LENGTH];
struct ATTR_PACKED {
uint8_t buf_[SALT_LENGTH];
uint16_t zero_;
} salt_;
struct ATTR_PACKED {
uint8_t fill_[SALT_LENGTH - sizeof(satp_prf_label_t) - sizeof(seq_nr_t)];
satp_prf_label_t label_;
seq_nr_t seq_;
uint16_t zero_;
} params_;
} key_derivation_aesctr_ctr_t;
#ifdef _MSC_VER
#pragma pack(pop)
#endif
class Interface
{
public:
// implemented
void encrypt(PlainPacket& in, EncryptedPacket& out, const Buffer& masterkey, const Buffer& mastersalt, role_t role, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux);
void decrypt(EncryptedPacket& in, PlainPacket& out, const Buffer& masterkey, const Buffer& mastersalt, role_t role);
void calcCryptCtr(const Buffer& masterkey, const Buffer& mastersalt, kd_dir_t dir, role_t role, satp_prf_label_t label, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux, cipher_aesctr_ctr_t * ctr);
void calcKeyCtr(const Buffer& mastersalt, kd_dir_t dir, role_t role, satp_prf_label_t label, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux, key_derivation_aesctr_ctr_t * ctr);
bool checkAndRemoveAuthTag(EncryptedPacket& packet, const Buffer& masterkey, const Buffer& mastersalt, role_t role);
void addAuthTag(EncryptedPacket& packet, const Buffer& masterkey, const Buffer& mastersalt, role_t role);
// pure virtual
virtual void calcMasterKeySalt(std::string passphrase, uint16_t length, Buffer& masterkey , Buffer& mastersalt) = 0;
virtual uint32_t cipher(uint8_t* in, uint32_t ilen, uint8_t* out, uint32_t olen, const Buffer& masterkey, const Buffer& mastersalt, role_t role, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux) = 0;
virtual uint32_t decipher(uint8_t* in, uint32_t ilen, uint8_t* out, uint32_t olen, const Buffer& masterkey, const Buffer& mastersalt, role_t role, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux) = 0;
virtual void deriveKey(kd_dir_t dir, satp_prf_label_t label, role_t role, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux, const Buffer& masterkey, const Buffer& mastersalt, Buffer& key) = 0;
virtual void calcAuthKey(Buffer & key, Buffer & digest, uint8_t * payload, size_t payload_length ) = 0;
virtual uint32_t getDigestLength() = 0;
// virtual
virtual ~Interface();
virtual std::string printType();
//static
static satp_prf_label_t convertLabel(kd_dir_t dir, role_t role, satp_prf_label_t label);
static bool init();
};
};
#endif
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