Annotation of src/usr.bin/lock/lock.c, Revision 1.24
1.24 ! martynas 1: /* $OpenBSD: lock.c,v 1.23 2006/04/26 02:35:08 deraadt Exp $ */
1.2 deraadt 2: /* $NetBSD: lock.c,v 1.8 1996/05/07 18:32:31 jtc Exp $ */
1.1 deraadt 3:
4: /*
5: * Copyright (c) 1980, 1987, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * This code is derived from software contributed to Berkeley by
9: * Bob Toxen.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. Redistributions in binary form must reproduce the above copyright
17: * notice, this list of conditions and the following disclaimer in the
18: * documentation and/or other materials provided with the distribution.
1.20 millert 19: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: */
35:
36: #ifndef lint
37: static char copyright[] =
38: "@(#) Copyright (c) 1980, 1987, 1993\n\
39: The Regents of the University of California. All rights reserved.\n";
40: #endif /* not lint */
41:
42: #ifndef lint
43: #if 0
44: static char sccsid[] = "@(#)lock.c 8.1 (Berkeley) 6/6/93";
45: #endif
1.24 ! martynas 46: static char rcsid[] = "$OpenBSD: lock.c,v 1.23 2006/04/26 02:35:08 deraadt Exp $";
1.1 deraadt 47: #endif /* not lint */
48:
49: /*
50: * Lock a terminal up until the given key is entered, until the root
51: * password is entered, or the given interval times out.
52: *
53: * Timeout interval is by default TIMEOUT, it can be changed with
54: * an argument of the form -time where time is in minutes
55: */
56:
57: #include <sys/param.h>
58: #include <sys/stat.h>
59: #include <sys/time.h>
60: #include <signal.h>
61:
62: #include <ctype.h>
63: #include <err.h>
64: #include <pwd.h>
1.13 millert 65: #include <readpassphrase.h>
1.1 deraadt 66: #include <stdio.h>
1.2 deraadt 67: #include <stdlib.h>
1.1 deraadt 68: #include <string.h>
69: #include <termios.h>
1.2 deraadt 70: #include <unistd.h>
1.1 deraadt 71:
1.13 millert 72: #include <login_cap.h>
73: #include <bsd_auth.h>
1.7 millert 74:
1.1 deraadt 75: #define TIMEOUT 15
76:
1.15 millert 77: void bye(int);
78: void hi(int);
1.1 deraadt 79:
80: struct timeval timeout;
81: struct timeval zerotime;
1.13 millert 82: time_t nexttime; /* keep the timeout time */
1.9 millert 83: int no_timeout; /* lock terminal forever */
1.1 deraadt 84:
1.13 millert 85: extern char *__progname;
86:
1.1 deraadt 87: /*ARGSUSED*/
1.9 millert 88: int
1.18 deraadt 89: main(int argc, char *argv[])
1.1 deraadt 90: {
1.18 deraadt 91: char hostname[MAXHOSTNAMELEN], s[BUFSIZ], s1[BUFSIZ], date[256];
92: char *p, *style, *nstyle, *ttynam;
93: struct itimerval ntimer, otimer;
1.24 ! martynas 94: int ch, sectimeout, usemine, cnt, tries = 10, backoff = 3;
1.22 deraadt 95: const char *errstr;
1.1 deraadt 96: struct passwd *pw;
97: struct tm *timp;
98: time_t curtime;
1.13 millert 99: login_cap_t *lc;
1.1 deraadt 100:
101: sectimeout = TIMEOUT;
1.13 millert 102: style = NULL;
1.1 deraadt 103: usemine = 0;
1.6 downsj 104: no_timeout = 0;
1.1 deraadt 105:
106: if (!(pw = getpwuid(getuid())))
1.17 deraadt 107: errx(1, "unknown uid %u.", getuid());
1.13 millert 108:
109: lc = login_getclass(pw->pw_class);
1.24 ! martynas 110: if (lc != NULL) {
! 111: /*
! 112: * We allow "login-tries" attempts to login but start
! 113: * slowing down after "login-backoff" attempts.
! 114: */
! 115: tries = (int)login_getcapnum(lc, "login-tries", 10, 10);
! 116: backoff = (int)login_getcapnum(lc, "login-backoff", 3, 3);
! 117: }
! 118:
1.13 millert 119: while ((ch = getopt(argc, argv, "a:npt:")) != -1)
1.19 deraadt 120: switch (ch) {
1.13 millert 121: case 'a':
122: if (lc) {
123: style = login_getstyle(lc, optarg, "auth-lock");
124: if (style == NULL)
125: errx(1,
126: "invalid authentication style: %s",
127: optarg);
128: }
129: usemine = 1;
130: break;
1.1 deraadt 131: case 't':
1.23 deraadt 132: sectimeout = (int)strtonum(optarg, 1, INT_MAX, &errstr);
1.22 deraadt 133: if (errstr)
134: errx(1, "timeout %s: %s", errstr, optarg);
1.1 deraadt 135: break;
136: case 'p':
137: usemine = 1;
138: break;
1.6 downsj 139: case 'n':
140: no_timeout = 1;
141: break;
1.1 deraadt 142: default:
1.10 millert 143: (void)fprintf(stderr,
1.21 jmc 144: "usage: %s [-np] [-a style] [-t timeout]\n",
1.13 millert 145: __progname);
1.1 deraadt 146: exit(1);
147: }
148: timeout.tv_sec = sectimeout * 60;
149:
150: gethostname(hostname, sizeof(hostname));
1.13 millert 151: if (!(ttynam = ttyname(STDIN_FILENO)))
1.1 deraadt 152: errx(1, "not a terminal?");
1.13 millert 153: curtime = time(NULL);
154: nexttime = curtime + (sectimeout * 60);
1.1 deraadt 155: timp = localtime(&curtime);
1.13 millert 156: strftime(date, sizeof(date), "%c", timp);
1.1 deraadt 157:
1.13 millert 158: if (!usemine) {
1.1 deraadt 159: /* get key and check again */
1.13 millert 160: if (!readpassphrase("Key: ", s, sizeof(s), RPP_ECHO_OFF) ||
161: *s == '\0')
162: exit(0);
1.1 deraadt 163: /*
164: * Don't need EOF test here, if we get EOF, then s1 != s
165: * and the right things will happen.
166: */
1.13 millert 167: (void)readpassphrase("Again: ", s1, sizeof(s1), RPP_ECHO_OFF);
1.1 deraadt 168: if (strcmp(s1, s)) {
1.13 millert 169: warnx("\apasswords didn't match.");
1.1 deraadt 170: exit(1);
171: }
1.5 deraadt 172: s[0] = '\0';
1.1 deraadt 173: }
174:
175: /* set signal handlers */
176: (void)signal(SIGINT, hi);
177: (void)signal(SIGQUIT, hi);
178: (void)signal(SIGTSTP, hi);
179: (void)signal(SIGALRM, bye);
180:
181: ntimer.it_interval = zerotime;
182: ntimer.it_value = timeout;
1.6 downsj 183: if (!no_timeout)
184: setitimer(ITIMER_REAL, &ntimer, &otimer);
1.1 deraadt 185:
186: /* header info */
1.6 downsj 187: if (no_timeout) {
1.13 millert 188: (void)fprintf(stderr,
189: "%s: %s on %s. no timeout\ntime now is %s\n",
190: __progname, ttynam, hostname, date);
1.6 downsj 191: } else {
1.13 millert 192: (void)fprintf(stderr,
193: "%s: %s on %s. timeout in %d minutes\ntime now is %s\n",
194: __progname, ttynam, hostname, sectimeout, date);
1.6 downsj 195: }
1.1 deraadt 196:
1.24 ! martynas 197: for (cnt = 0;;) {
1.13 millert 198: if (!readpassphrase("Key: ", s, sizeof(s), RPP_ECHO_OFF) ||
199: *s == '\0') {
1.9 millert 200: hi(0);
1.1 deraadt 201: continue;
202: }
203: if (usemine) {
1.13 millert 204: /*
205: * If user entered 's/key' or the style specified via
206: * the '-a' argument, auth_userokay() will prompt
207: * for a new password. Otherwise, use what we have.
208: */
209: if ((strcmp(s, "s/key") == 0 &&
210: (nstyle = login_getstyle(lc, "skey", "auth-lock")))
211: || ((nstyle = style) && strcmp(s, nstyle) == 0))
212: p = NULL;
213: else
214: p = s;
215: if (auth_userokay(pw->pw_name, nstyle, "auth-lock", p))
1.1 deraadt 216: break;
1.13 millert 217: } else if (strcmp(s, s1) == 0)
1.1 deraadt 218: break;
1.13 millert 219: (void)putc('\a', stderr);
1.24 ! martynas 220: cnt %= tries;
! 221: if (++cnt > backoff) {
! 222: sigset_t set, oset;
! 223: sigfillset(&set);
! 224: sigprocmask(SIG_BLOCK, &set, &oset);
! 225: sleep((u_int)((cnt - backoff) * tries / 2));
! 226: sigprocmask(SIG_SETMASK, &oset, NULL);
! 227: }
1.1 deraadt 228: }
1.9 millert 229:
1.13 millert 230: exit(0);
1.1 deraadt 231: }
232:
1.23 deraadt 233: /*ARGSUSED*/
1.1 deraadt 234: void
1.23 deraadt 235: hi(int signo)
1.1 deraadt 236: {
1.14 deraadt 237: char buf[1024], buf2[1024];
1.13 millert 238: time_t now;
1.1 deraadt 239:
1.14 deraadt 240: if (no_timeout)
241: buf2[0] = '\0';
242: else {
1.13 millert 243: now = time(NULL);
1.14 deraadt 244: (void)snprintf(buf2, sizeof buf2, " timeout in %d:%d minutes",
245: (nexttime - now) / 60, (nexttime - now) % 60);
1.6 downsj 246: }
1.23 deraadt 247: (void)snprintf(buf, sizeof buf, "%s: type in the unlock key.%s\n",
1.14 deraadt 248: __progname, buf2);
249: (void) write(STDERR_FILENO, buf, strlen(buf));
1.1 deraadt 250: }
251:
1.23 deraadt 252: /*ARGSUSED*/
1.1 deraadt 253: void
1.23 deraadt 254: bye(int signo)
1.1 deraadt 255: {
256:
1.13 millert 257: if (!no_timeout)
1.16 millert 258: warnx("timeout");
259: _exit(1);
1.1 deraadt 260: }