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
|
/* $OpenBSD: encrypt.c,v 1.35 2014/12/29 17:07:17 tedu Exp $ */
/*
* Copyright (c) 1996, Jason Downs. All rights reserved.
*
* 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(S) ``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(S) 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 <ctype.h>
#include <err.h>
#include <errno.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <login_cap.h>
#include <limits.h>
/*
* Very simple little program, for encrypting passwords from the command
* line. Useful for scripts and such.
*/
extern char *__progname;
void usage(void);
int ideal_rounds(void);
void print_passwd(char *, int, void *);
#define DO_BLF 0
void
usage(void)
{
(void)fprintf(stderr,
"usage: %s [-b rounds] [-c class] [-p | string]\n",
__progname);
exit(1);
}
/*
* Time how long 8 rounds takes to measure this system's performance.
* We are aiming for something that takes between 0.25 and 0.5 seconds.
*/
int
ideal_rounds(void)
{
clock_t before, after;
int r = 8;
char buf[_PASSWORD_LEN];
int duration;
strlcpy(buf, bcrypt_gensalt(r), _PASSWORD_LEN);
before = clock();
crypt("testpassword", buf);
after = clock();
duration = after - before;
/* too quick? slow it down. */
while (r < 16 && duration <= CLOCKS_PER_SEC / 4) {
r += 1;
duration *= 2;
}
/* too slow? speed it up. */
while (r > 4 && duration > CLOCKS_PER_SEC / 2) {
r -= 1;
duration /= 2;
}
return r;
}
void
print_passwd(char *string, int operation, void *extra)
{
char buffer[_PASSWORD_LEN];
if (operation == DO_BLF) {
int rounds = *(int *)extra;
if (bcrypt_newhash(string, rounds, buffer, sizeof(buffer)) != 0)
errx(1, "bcrypt newhash failed");
fputs(buffer, stdout);
return;
} else {
login_cap_t *lc;
const char *pref;
if ((lc = login_getclass(extra)) == NULL)
errx(1, "unable to get login class `%s'",
extra ? (char *)extra : "default");
pref = login_getcapstr(lc, "localcipher", NULL, NULL);
if (crypt_newhash(string, pref, buffer, sizeof(buffer)) != 0)
errx(1, "can't generate hash");
}
fputs(buffer, stdout);
}
int
main(int argc, char **argv)
{
int opt;
int operation = -1;
int prompt = 0;
int rounds;
void *extra = NULL; /* Store salt or number of rounds */
const char *errstr;
while ((opt = getopt(argc, argv, "pb:c:")) != -1) {
switch (opt) {
case 'p':
prompt = 1;
break;
case 'b': /* Blowfish password hash */
if (operation != -1)
usage();
operation = DO_BLF;
if (strcmp(optarg, "a") == 0)
rounds = ideal_rounds();
else
rounds = strtonum(optarg, 1, INT_MAX, &errstr);
if (errstr != NULL)
errx(1, "%s: %s", errstr, optarg);
extra = &rounds;
break;
case 'c': /* user login class */
extra = optarg;
operation = -1;
break;
default:
usage();
}
}
if (((argc - optind) < 1)) {
char line[BUFSIZ], *string;
if (prompt) {
if ((string = getpass("Enter string: ")) == NULL)
err(1, "getpass");
print_passwd(string, operation, extra);
(void)fputc('\n', stdout);
} else {
size_t len;
/* Encrypt stdin to stdout. */
while (!feof(stdin) &&
(fgets(line, sizeof(line), stdin) != NULL)) {
len = strlen(line);
if (len == 0 || line[0] == '\n')
continue;
if (line[len - 1] == '\n')
line[len - 1] = '\0';
print_passwd(line, operation, extra);
(void)fputc('\n', stdout);
}
}
} else {
char *string;
/* can't combine -p with a supplied string */
if (prompt)
usage();
/* Perhaps it isn't worth worrying about, but... */
if ((string = strdup(argv[optind])) == NULL)
err(1, NULL);
/* Wipe the argument. */
memset(argv[optind], 0, strlen(argv[optind]));
print_passwd(string, operation, extra);
(void)fputc('\n', stdout);
/* Wipe our copy, before we free it. */
memset(string, 0, strlen(string));
free(string);
}
exit(0);
}
|
