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532ac0df WJ |
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*/ | |
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 | |
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 | |
207 | quit() | |
208 | { | |
209 | (void)putchar('\n'); | |
210 | (void)ioctl(0, TIOCSETP, &tty); | |
211 | exit(0); | |
212 | } | |
213 | ||
214 | void | |
215 | bye() | |
216 | { | |
217 | (void)ioctl(0, TIOCSETP, &tty); | |
218 | (void)printf("lock: timeout\n"); | |
219 | exit(1); | |
220 | } |