1 /*
2 * Copyright (c) 1980, 1987 Regents of the University of California.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 #ifndef lint
35 char copyright[] =
36 "@(#) Copyright (c) 1980, 1987 Regents of the University of California.\n\
37 All rights reserved.\n";
38 #endif /* not lint */
39
40 #ifndef lint
41 static char sccsid[] = "@(#)lock.c 5.13 (Berkeley) 6/1/90";
42 #endif /* not lint */
43
44 /*
45 * Lock a terminal up until the given key is entered, until the root
46 * password is entered, or the given interval times out.
47 *
48 * Timeout interval is by default TIMEOUT, it can be changed with
49 * an argument of the form -time where time is in minutes
50 */
51
52 #include <sys/param.h>
53 #include <sys/stat.h>
54 #include <sys/time.h>
55 #include <sys/signal.h>
56 #include <sgtty.h>
57 #include <pwd.h>
58 #include <stdio.h>
59 #include <ctype.h>
60 #include <string.h>
61
62 #define TIMEOUT 15
63
64 void quit(), bye(), hi();
65
66 struct timeval timeout;
67 struct timeval zerotime;
68 struct sgttyb tty, ntty;
69 long nexttime; /* keep the timeout time */
70
71 /*ARGSUSED*/
main(argc,argv)72 main(argc, argv)
73 int argc;
74 char **argv;
75 {
76 extern char *optarg;
77 extern int errno, optind;
78 struct passwd *pw;
79 struct timeval timval;
80 struct itimerval ntimer, otimer;
81 struct tm *timp;
82 int ch, sectimeout, usemine;
83 char *ap, *mypw, *ttynam, *tzn;
84 char hostname[MAXHOSTNAMELEN], s[BUFSIZ], s1[BUFSIZ];
85 char *crypt(), *ttyname();
86
87 sectimeout = TIMEOUT;
88 mypw = NULL;
89 usemine = 0;
90 while ((ch = getopt(argc, argv, "pt:")) != EOF)
91 switch((char)ch) {
92 case 't':
93 if ((sectimeout = atoi(optarg)) <= 0) {
94 (void)fprintf(stderr,
95 "lock: illegal timeout value.\n");
96 exit(1);
97 }
98 break;
99 case 'p':
100 usemine = 1;
101 if (!(pw = getpwuid(getuid()))) {
102 (void)fprintf(stderr,
103 "lock: unknown uid %d.\n", getuid());
104 exit(1);
105 }
106 mypw = strdup(pw->pw_passwd);
107 break;
108 case '?':
109 default:
110 (void)fprintf(stderr,
111 "usage: lock [-p] [-t timeout]\n");
112 exit(1);
113 }
114 timeout.tv_sec = sectimeout * 60;
115
116 setuid(getuid()); /* discard privs */
117
118 if (ioctl(0, TIOCGETP, &tty)) /* get information for header */
119 exit(1);
120 gethostname(hostname, sizeof(hostname));
121 if (!(ttynam = ttyname(0))) {
122 (void)printf("lock: not a terminal?\n");
123 exit(1);
124 }
125 if (gettimeofday(&timval, (struct timezone *)NULL)) {
126 (void)fprintf(stderr,
127 "lock: gettimeofday: %s\n", strerror(errno));
128 exit(1);
129 }
130 nexttime = timval.tv_sec + (sectimeout * 60);
131 timp = localtime(&timval.tv_sec);
132 ap = asctime(timp);
133 tzn = timp->tm_zone;
134
135 (void)signal(SIGINT, quit);
136 (void)signal(SIGQUIT, quit);
137 ntty = tty; ntty.sg_flags &= ~ECHO;
138 (void)ioctl(0, TIOCSETP, &ntty);
139
140 if (!mypw) {
141 /* get key and check again */
142 (void)printf("Key: ");
143 if (!fgets(s, sizeof(s), stdin) || *s == '\n')
144 quit();
145 (void)printf("\nAgain: ");
146 /*
147 * Don't need EOF test here, if we get EOF, then s1 != s
148 * and the right things will happen.
149 */
150 (void)fgets(s1, sizeof(s1), stdin);
151 (void)putchar('\n');
152 if (strcmp(s1, s)) {
153 (void)printf("\07lock: passwords didn't match.\n");
154 ioctl(0, TIOCSETP, &tty);
155 exit(1);
156 }
157 s[0] = NULL;
158 mypw = s1;
159 }
160
161 /* set signal handlers */
162 (void)signal(SIGINT, hi);
163 (void)signal(SIGQUIT, hi);
164 (void)signal(SIGTSTP, hi);
165 (void)signal(SIGALRM, bye);
166
167 ntimer.it_interval = zerotime;
168 ntimer.it_value = timeout;
169 setitimer(ITIMER_REAL, &ntimer, &otimer);
170
171 /* header info */
172 (void)printf("lock: %s on %s. timeout in %d minutes\ntime now is %.20s%s%s",
173 ttynam, hostname, sectimeout, ap, tzn, ap + 19);
174
175 for (;;) {
176 (void)printf("Key: ");
177 if (!fgets(s, sizeof(s), stdin)) {
178 clearerr(stdin);
179 hi();
180 continue;
181 }
182 if (usemine) {
183 s[strlen(s) - 1] = '\0';
184 if (!strcmp(mypw, crypt(s, mypw)))
185 break;
186 }
187 else if (!strcmp(s, s1))
188 break;
189 (void)printf("\07\n");
190 if (ioctl(0, TIOCGETP, &ntty))
191 exit(1);
192 }
193 quit();
194 }
195
196 void
hi()197 hi()
198 {
199 struct timeval timval;
200
201 if (!gettimeofday(&timval, (struct timezone *)NULL))
202 (void)printf("lock: type in the unlock key. timeout in %ld:%ld minutes\n",
203 (nexttime - timval.tv_sec) / 60, (nexttime - timval.tv_sec) % 60);
204 }
205
206 void
quit()207 quit()
208 {
209 (void)putchar('\n');
210 (void)ioctl(0, TIOCSETP, &tty);
211 exit(0);
212 }
213
214 void
bye()215 bye()
216 {
217 (void)ioctl(0, TIOCSETP, &tty);
218 (void)printf("lock: timeout\n");
219 exit(1);
220 }
221