1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
/*
* uAnytun
*
* uAnytun is a tiny implementation of SATP. Unlike Anytun which is a full
* featured implementation uAnytun has no support for multiple connections
* or synchronisation. It is a small single threaded implementation intended
* to act as a client on small platforms.
* 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) 2007-2016 Christian Pointner <equinox@anytun.org>
*
* This file is part of uAnytun.
*
* uAnytun 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.
*
* uAnytun 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 uAnytun. 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 UANYTUN_cipher_h_INCLUDED
#define UANYTUN_cipher_h_INCLUDED
#ifndef NO_CRYPT
#if defined(USE_SSL_CRYPTO)
#include <openssl/aes.h>
#elif defined(USE_NETTLE)
#include <nettle/aes.h>
#else // USE_GCRYPT is the default
#include <gcrypt.h>
#endif
#include "key_derivation.h"
#else
enum key_derivation_dir_enum { kd_inbound = 0, kd_outbound = 1 };
typedef enum key_derivation_dir_enum key_derivation_dir_t;
typedef u_int8_t key_derivation_t;
#endif
enum cipher_type_enum { c_unknown, c_null, c_aes_ctr };
typedef enum cipher_type_enum cipher_type_t;
struct cipher_struct {
cipher_type_t type_;
u_int16_t key_length_;
buffer_t key_;
buffer_t salt_;
void* params_;
};
typedef struct cipher_struct cipher_t;
int cipher_init(cipher_t* c, const char* type);
void cipher_close(cipher_t* c);
int cipher_encrypt(cipher_t* c, key_derivation_t* kd, key_derivation_dir_t dir, plain_packet_t* in, encrypted_packet_t* out, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux);
int cipher_decrypt(cipher_t* c, key_derivation_t* kd, key_derivation_dir_t dir, encrypted_packet_t* in, plain_packet_t* out);
int32_t cipher_null_crypt(u_int8_t* in, u_int32_t ilen, u_int8_t* out, u_int32_t olen);
#ifndef NO_CRYPT
#define C_AESCTR_DEFAULT_KEY_LENGTH 128
#define C_AESCTR_CTR_LENGTH 16
#define C_AESCTR_SALT_LENGTH 14
union __attribute__((__packed__)) cipher_aesctr_ctr_union {
u_int8_t buf_[C_AESCTR_CTR_LENGTH];
struct __attribute__ ((__packed__)) {
u_int8_t buf_[C_AESCTR_SALT_LENGTH];
u_int16_t zero_;
} salt_;
struct __attribute__((__packed__)) {
u_int8_t fill_[C_AESCTR_SALT_LENGTH - sizeof(mux_t) - sizeof(sender_id_t) - 2*sizeof(u_int8_t) - sizeof(seq_nr_t)];
mux_t mux_;
sender_id_t sender_id_;
u_int8_t empty_[2];
seq_nr_t seq_nr_;
u_int16_t zero_;
} params_;
};
typedef union cipher_aesctr_ctr_union cipher_aesctr_ctr_t;
struct cipher_aesctr_param_struct {
#if defined(USE_SSL_CRYPTO)
AES_KEY aes_key_;
u_int8_t ecount_buf_[AES_BLOCK_SIZE];
#elif defined(USE_NETTLE)
struct aes_ctx ctx_;
#else // USE_GCRYPT is the default
gcry_cipher_hd_t handle_;
#endif
cipher_aesctr_ctr_t ctr_;
};
typedef struct cipher_aesctr_param_struct cipher_aesctr_param_t;
int cipher_aesctr_init(cipher_t* c);
void cipher_aesctr_close(cipher_t* c);
int cipher_aesctr_calc_ctr(cipher_t* c, key_derivation_t* kd, key_derivation_dir_t dir, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux);
int32_t cipher_aesctr_crypt(cipher_t* c, key_derivation_t* kd, key_derivation_dir_t dir, u_int8_t* in, u_int32_t ilen, u_int8_t* out, u_int32_t olen, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux);
#endif
#endif
|
