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
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
/* $OpenBSD: des3.c,v 1.4 2002/04/03 21:33:41 markus Exp $ */
/*
* Copyright (c) 2002 Markus Friedl. All rights reserverd.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/sysctl.h>
#include <crypto/cryptodev.h>
#include <des.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
int
syscrypt(const unsigned char *key, size_t klen, const unsigned char *iv,
const unsigned char *in, unsigned char *out, size_t len, int encrypt)
{
struct session_op session;
struct crypt_op cryp;
int cryptodev_fd = -1, fd = -1;
if ((cryptodev_fd = open("/dev/crypto", O_RDWR, 0)) < 0) {
warn("/dev/crypto");
goto err;
}
if (ioctl(cryptodev_fd, CRIOGET, &fd) == -1) {
warn("CRIOGET failed");
goto err;
}
memset(&session, 0, sizeof(session));
session.cipher = CRYPTO_3DES_CBC;
session.key = (caddr_t) key;
session.keylen = klen;
if (ioctl(fd, CIOCGSESSION, &session) == -1) {
warn("CIOCGSESSION");
goto err;
}
memset(&cryp, 0, sizeof(cryp));
cryp.ses = session.ses;
cryp.op = encrypt ? COP_ENCRYPT : COP_DECRYPT;
cryp.flags = 0;
cryp.len = len;
cryp.src = (caddr_t) in;
cryp.dst = (caddr_t) out;
cryp.iv = (caddr_t) iv;
cryp.mac = 0;
if (ioctl(fd, CIOCCRYPT, &cryp) == -1) {
warn("CIOCCRYPT");
goto err;
}
if (ioctl(fd, CIOCFSESSION, &session.ses) == -1) {
warn("CIOCFSESSION");
goto err;
}
close(fd);
close(cryptodev_fd);
return (0);
err:
if (fd != -1)
close(fd);
if (cryptodev_fd != -1)
close(cryptodev_fd);
return (-1);
}
int
getallowsoft(void)
{
int mib[2], old;
size_t olen;
olen = sizeof(old);
mib[0] = CTL_KERN;
mib[1] = KERN_CRYPTODEVALLOWSOFT;
if (sysctl(mib, 2, &old, &olen, NULL, 0) < 0)
err(1, "sysctl failed");
return old;
}
void
setallowsoft(int new)
{
int mib[2], old;
size_t olen, nlen;
olen = nlen = sizeof(new);
mib[0] = CTL_KERN;
mib[1] = KERN_CRYPTODEVALLOWSOFT;
if (sysctl(mib, 2, &old, &olen, &new, nlen) < 0)
err(1, "sysctl failed");
}
int
match(unsigned char *a, unsigned char *b, size_t len)
{
int i;
if (memcmp(a, b, len) == 0)
return (1);
warnx("decrypt/plaintext mismatch");
for (i = 0; i < len; i++)
printf("%2.2x", a[i]);
printf("\n");
for (i = 0; i < len; i++)
printf("%2.2x", b[i]);
printf("\n");
return (0);
}
#define SZ 16
int
main(int argc, char **argv)
{
des_key_schedule ks1, ks2, ks3;
unsigned char iv0[8], iv[8], key[24] = "012345670123456701234567";
unsigned char b1[SZ], b2[SZ];
int allowed, i, fail = 0;
u_int32_t rand;
if (geteuid() == 0) {
allowed = getallowsoft();
if (allowed == 0)
setallowsoft(1);
}
/* setup data and iv */
for (i = 0; i < sizeof(b1); i++ ) {
if (i % 4 == 0)
rand = arc4random();
b1[i] = rand;
rand >>= 8;
}
for (i = 0; i < sizeof(iv0); i++ ) {
if (i % 4 == 0)
rand = arc4random();
iv0[i] = rand;
rand >>= 8;
}
memset(b2, 0, sizeof(b2));
/* keysetup for software */
des_set_key((void *) key, ks1);
des_set_key((void *) (key+8), ks2);
des_set_key((void *) (key+16), ks3);
/* encrypt with software, decrypt with /dev/crypto */
memcpy(iv, iv0, sizeof(iv0));
des_ede3_cbc_encrypt((void *)b1, (void*)b2, sizeof(b1), ks1, ks2, ks3,
(void*)iv, DES_ENCRYPT);
memcpy(iv, iv0, sizeof(iv0));
if (syscrypt(key, sizeof(key), iv, b2, b2, sizeof(b1), 0) < 0) {
warnx("decrypt with /dev/crypto failed");
fail++;
}
if (!match(b1, b2, sizeof(b1)))
fail++;
else
printf("ok, encrypt with software, decrypt with /dev/crypto\n");
/* encrypt with /dev/crypto, decrypt with software */
memset(b2, 0, sizeof(b2));
memcpy(iv, iv0, sizeof(iv0));
if (syscrypt(key, sizeof(key), iv, b1, b2, sizeof(b1), 1) < 0) {
warnx("encrypt with /dev/crypto failed");
fail++;
}
memcpy(iv, iv0, sizeof(iv0));
des_ede3_cbc_encrypt((void *)b2, (void*)b2, sizeof(b1), ks1, ks2, ks3,
(void*)iv, DES_DECRYPT);
if (!match(b1, b2, sizeof(b1)))
fail++;
else
printf("ok, encrypt with /dev/crypto, decrypt with software\n");
if (geteuid() == 0 && allowed == 0)
setallowsoft(0);
exit((fail > 0) ? 1 : 0);
}
|
