Annotation of src/usr.bin/lock/lock.c, Revision 1.2
1.2 ! deraadt 1: /* $NetBSD: lock.c,v 1.8 1996/05/07 18:32:31 jtc Exp $ */
1.1 deraadt 2:
3: /*
4: * Copyright (c) 1980, 1987, 1993
5: * The Regents of the University of California. All rights reserved.
6: *
7: * This code is derived from software contributed to Berkeley by
8: * Bob Toxen.
9: *
10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
13: * 1. Redistributions of source code must retain the above copyright
14: * notice, this list of conditions and the following disclaimer.
15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
17: * documentation and/or other materials provided with the distribution.
18: * 3. All advertising materials mentioning features or use of this software
19: * must display the following acknowledgement:
20: * This product includes software developed by the University of
21: * California, Berkeley and its contributors.
22: * 4. Neither the name of the University nor the names of its contributors
23: * may be used to endorse or promote products derived from this software
24: * without specific prior written permission.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36: * SUCH DAMAGE.
37: */
38:
39: #ifndef lint
40: static char copyright[] =
41: "@(#) Copyright (c) 1980, 1987, 1993\n\
42: The Regents of the University of California. All rights reserved.\n";
43: #endif /* not lint */
44:
45: #ifndef lint
46: #if 0
47: static char sccsid[] = "@(#)lock.c 8.1 (Berkeley) 6/6/93";
48: #endif
1.2 ! deraadt 49: static char rcsid[] = "$NetBSD: lock.c,v 1.8 1996/05/07 18:32:31 jtc Exp $";
1.1 deraadt 50: #endif /* not lint */
51:
52: /*
53: * Lock a terminal up until the given key is entered, until the root
54: * password is entered, or the given interval times out.
55: *
56: * Timeout interval is by default TIMEOUT, it can be changed with
57: * an argument of the form -time where time is in minutes
58: */
59:
60: #include <sys/param.h>
61: #include <sys/stat.h>
62: #include <sys/time.h>
63: #include <signal.h>
64:
65: #include <ctype.h>
66: #include <err.h>
67: #include <pwd.h>
68: #include <stdio.h>
1.2 ! deraadt 69: #include <stdlib.h>
1.1 deraadt 70: #include <string.h>
71: #include <termios.h>
1.2 ! deraadt 72: #include <unistd.h>
1.1 deraadt 73:
74: #define TIMEOUT 15
75:
76: void quit(), bye(), hi();
77:
78: struct timeval timeout;
79: struct timeval zerotime;
80: struct termios tty, ntty;
81: long nexttime; /* keep the timeout time */
82:
83: /*ARGSUSED*/
84: main(argc, argv)
85: int argc;
86: char **argv;
87: {
88: extern char *optarg;
89: struct passwd *pw;
90: struct timeval timval;
91: struct itimerval ntimer, otimer;
92: struct tm *timp;
93: time_t curtime;
94: int ch, sectimeout, usemine;
95: char *ap, *mypw, *ttynam, *tzn;
96: char hostname[MAXHOSTNAMELEN], s[BUFSIZ], s1[BUFSIZ];
1.2 ! deraadt 97: char *crypt();
1.1 deraadt 98:
99: sectimeout = TIMEOUT;
100: mypw = NULL;
101: usemine = 0;
102:
103: if (!(pw = getpwuid(getuid())))
104: errx(1, "unknown uid %d.", getuid());
105:
106: while ((ch = getopt(argc, argv, "pt:")) != EOF)
107: switch((char)ch) {
108: case 't':
109: if ((sectimeout = atoi(optarg)) <= 0)
110: errx(1, "illegal timeout value: %s", optarg);
111: break;
112: case 'p':
113: usemine = 1;
114: mypw = strdup(pw->pw_passwd);
115: break;
116: case '?':
117: default:
118: (void)fprintf(stderr,
119: "usage: lock [-p] [-t timeout]\n");
120: exit(1);
121: }
122: timeout.tv_sec = sectimeout * 60;
123:
124: setuid(getuid()); /* discard privs */
125:
126: if (tcgetattr(0, &tty) < 0) /* get information for header */
127: exit(1);
128: gethostname(hostname, sizeof(hostname));
129: if (!(ttynam = ttyname(0)))
130: errx(1, "not a terminal?");
131: if (gettimeofday(&timval, (struct timezone *)NULL))
132: err(1, "gettimeofday");
133: curtime = timval.tv_sec;
134: nexttime = timval.tv_sec + (sectimeout * 60);
135: timp = localtime(&curtime);
136: ap = asctime(timp);
137: tzn = timp->tm_zone;
138:
139: (void)signal(SIGINT, quit);
140: (void)signal(SIGQUIT, quit);
141: ntty = tty; ntty.c_lflag &= ~ECHO;
142: (void)tcsetattr(0, TCSADRAIN, &ntty);
143:
144: if (!mypw) {
145: /* get key and check again */
146: (void)printf("Key: ");
147: if (!fgets(s, sizeof(s), stdin) || *s == '\n')
148: quit();
149: (void)printf("\nAgain: ");
150: /*
151: * Don't need EOF test here, if we get EOF, then s1 != s
152: * and the right things will happen.
153: */
154: (void)fgets(s1, sizeof(s1), stdin);
155: (void)putchar('\n');
156: if (strcmp(s1, s)) {
157: (void)printf("\alock: passwords didn't match.\n");
158: (void)tcsetattr(0, TCSADRAIN, &tty);
159: exit(1);
160: }
161: s[0] = NULL;
162: mypw = s1;
163: }
164:
165: /* set signal handlers */
166: (void)signal(SIGINT, hi);
167: (void)signal(SIGQUIT, hi);
168: (void)signal(SIGTSTP, hi);
169: (void)signal(SIGALRM, bye);
170:
171: ntimer.it_interval = zerotime;
172: ntimer.it_value = timeout;
173: setitimer(ITIMER_REAL, &ntimer, &otimer);
174:
175: /* header info */
176: (void)printf("lock: %s on %s. timeout in %d minutes\ntime now is %.20s%s%s",
177: ttynam, hostname, sectimeout, ap, tzn, ap + 19);
178:
179: for (;;) {
180: (void)printf("Key: ");
181: if (!fgets(s, sizeof(s), stdin)) {
182: clearerr(stdin);
183: hi();
184: continue;
185: }
186: if (usemine) {
187: s[strlen(s) - 1] = '\0';
188: #ifdef SKEY
189: if (strcasecmp(s, "s/key") == 0) {
190: if (skey_auth(pw->pw_name))
191: break;
192: }
193: #endif
194: if (!strcmp(mypw, crypt(s, mypw)))
195: break;
196: }
197: else if (!strcmp(s, s1))
198: break;
199: (void)printf("\a\n");
200: if (tcsetattr(0, TCSADRAIN, &ntty) < 0)
201: exit(1);
202: }
203: quit();
204: }
205:
206: #ifdef SKEY
207: /*
208: * We can't use libskey's skey_authenticate() since it
209: * handles signals in a way that's inappropriate
210: * for our needs. Instead we roll our own.
211: */
212: int
213: skey_auth(char *user)
214: {
215: char s[128], *ask, *skey_keyinfo __P((char *name));
216: int ret = 0;
217:
218: if (!skey_haskey(user) && (ask = skey_keyinfo(user))) {
219: printf("\n[%s]\nResponse: ", ask);
220: if (!fgets(s, sizeof(s), stdin) || *s == '\n')
221: clearerr(stdin);
222: else {
223: s[strlen(s) - 1] = '\0';
224: if (skey_passcheck(user, s) != -1)
225: ret = 1;
226: }
227: } else
228: printf("Sorry, you have no s/key.\n");
229: return ret;
230: }
231: #endif
232:
233: void
234: hi()
235: {
236: struct timeval timval;
237:
238: if (!gettimeofday(&timval, (struct timezone *)NULL))
239: (void)printf("lock: type in the unlock key. timeout in %ld:%ld minutes\n",
240: (nexttime - timval.tv_sec) / 60, (nexttime - timval.tv_sec) % 60);
241: }
242:
243: void
244: quit()
245: {
246: (void)putchar('\n');
247: (void)tcsetattr(0, TCSADRAIN, &tty);
248: exit(0);
249: }
250:
251: void
252: bye()
253: {
254: (void)tcsetattr(0, TCSADRAIN, &tty);
255: (void)printf("lock: timeout\n");
256: exit(1);
257: }
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