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
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
|
/* $OpenBSD: lock.c,v 1.23 2006/04/26 02:35:08 deraadt Exp $ */
/* $NetBSD: lock.c,v 1.8 1996/05/07 18:32:31 jtc Exp $ */
/*
* Copyright (c) 1980, 1987, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Bob Toxen.
*
* 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.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
*/
#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1980, 1987, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)lock.c 8.1 (Berkeley) 6/6/93";
#endif
static char rcsid[] = "$OpenBSD: lock.c,v 1.23 2006/04/26 02:35:08 deraadt Exp $";
#endif /* not lint */
/*
* Lock a terminal up until the given key is entered, until the root
* password is entered, or the given interval times out.
*
* Timeout interval is by default TIMEOUT, it can be changed with
* an argument of the form -time where time is in minutes
*/
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <signal.h>
#include <ctype.h>
#include <err.h>
#include <pwd.h>
#include <readpassphrase.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include <login_cap.h>
#include <bsd_auth.h>
#define TIMEOUT 15
void bye(int);
void hi(int);
struct timeval timeout;
struct timeval zerotime;
time_t nexttime; /* keep the timeout time */
int no_timeout; /* lock terminal forever */
extern char *__progname;
/*ARGSUSED*/
int
main(int argc, char *argv[])
{
char hostname[MAXHOSTNAMELEN], s[BUFSIZ], s1[BUFSIZ], date[256];
char *p, *style, *nstyle, *ttynam;
struct itimerval ntimer, otimer;
int ch, sectimeout, usemine;
const char *errstr;
struct passwd *pw;
struct tm *timp;
time_t curtime;
login_cap_t *lc;
sectimeout = TIMEOUT;
style = NULL;
usemine = 0;
no_timeout = 0;
if (!(pw = getpwuid(getuid())))
errx(1, "unknown uid %u.", getuid());
lc = login_getclass(pw->pw_class);
while ((ch = getopt(argc, argv, "a:npt:")) != -1)
switch (ch) {
case 'a':
if (lc) {
style = login_getstyle(lc, optarg, "auth-lock");
if (style == NULL)
errx(1,
"invalid authentication style: %s",
optarg);
}
usemine = 1;
break;
case 't':
sectimeout = (int)strtonum(optarg, 1, INT_MAX, &errstr);
if (errstr)
errx(1, "timeout %s: %s", errstr, optarg);
break;
case 'p':
usemine = 1;
break;
case 'n':
no_timeout = 1;
break;
default:
(void)fprintf(stderr,
"usage: %s [-np] [-a style] [-t timeout]\n",
__progname);
exit(1);
}
timeout.tv_sec = sectimeout * 60;
gethostname(hostname, sizeof(hostname));
if (!(ttynam = ttyname(STDIN_FILENO)))
errx(1, "not a terminal?");
curtime = time(NULL);
nexttime = curtime + (sectimeout * 60);
timp = localtime(&curtime);
strftime(date, sizeof(date), "%c", timp);
if (!usemine) {
/* get key and check again */
if (!readpassphrase("Key: ", s, sizeof(s), RPP_ECHO_OFF) ||
*s == '\0')
exit(0);
/*
* Don't need EOF test here, if we get EOF, then s1 != s
* and the right things will happen.
*/
(void)readpassphrase("Again: ", s1, sizeof(s1), RPP_ECHO_OFF);
if (strcmp(s1, s)) {
warnx("\apasswords didn't match.");
exit(1);
}
s[0] = '\0';
}
/* set signal handlers */
(void)signal(SIGINT, hi);
(void)signal(SIGQUIT, hi);
(void)signal(SIGTSTP, hi);
(void)signal(SIGALRM, bye);
ntimer.it_interval = zerotime;
ntimer.it_value = timeout;
if (!no_timeout)
setitimer(ITIMER_REAL, &ntimer, &otimer);
/* header info */
if (no_timeout) {
(void)fprintf(stderr,
"%s: %s on %s. no timeout\ntime now is %s\n",
__progname, ttynam, hostname, date);
} else {
(void)fprintf(stderr,
"%s: %s on %s. timeout in %d minutes\ntime now is %s\n",
__progname, ttynam, hostname, sectimeout, date);
}
for (;;) {
if (!readpassphrase("Key: ", s, sizeof(s), RPP_ECHO_OFF) ||
*s == '\0') {
hi(0);
continue;
}
if (usemine) {
/*
* If user entered 's/key' or the style specified via
* the '-a' argument, auth_userokay() will prompt
* for a new password. Otherwise, use what we have.
*/
if ((strcmp(s, "s/key") == 0 &&
(nstyle = login_getstyle(lc, "skey", "auth-lock")))
|| ((nstyle = style) && strcmp(s, nstyle) == 0))
p = NULL;
else
p = s;
if (auth_userokay(pw->pw_name, nstyle, "auth-lock", p))
break;
} else if (strcmp(s, s1) == 0)
break;
(void)putc('\a', stderr);
}
exit(0);
}
/*ARGSUSED*/
void
hi(int signo)
{
char buf[1024], buf2[1024];
time_t now;
if (no_timeout)
buf2[0] = '\0';
else {
now = time(NULL);
(void)snprintf(buf2, sizeof buf2, " timeout in %d:%d minutes",
(nexttime - now) / 60, (nexttime - now) % 60);
}
(void)snprintf(buf, sizeof buf, "%s: type in the unlock key.%s\n",
__progname, buf2);
(void) write(STDERR_FILENO, buf, strlen(buf));
}
/*ARGSUSED*/
void
bye(int signo)
{
if (!no_timeout)
warnx("timeout");
_exit(1);
}
|
