Annotation of src/usr.bin/lock/lock.c, Revision 1.37
1.37 ! tedu 1: /* $OpenBSD: lock.c,v 1.36 2017/07/08 22:07:39 tedu 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: /*
37: * Lock a terminal up until the given key is entered, until the root
38: * password is entered, or the given interval times out.
39: *
40: * Timeout interval is by default TIMEOUT, it can be changed with
41: * an argument of the form -time where time is in minutes
42: */
43:
44: #include <sys/stat.h>
45: #include <sys/time.h>
46: #include <signal.h>
47:
48: #include <ctype.h>
49: #include <err.h>
50: #include <pwd.h>
1.13 millert 51: #include <readpassphrase.h>
1.1 deraadt 52: #include <stdio.h>
1.2 deraadt 53: #include <stdlib.h>
1.1 deraadt 54: #include <string.h>
55: #include <termios.h>
1.2 deraadt 56: #include <unistd.h>
1.28 deraadt 57: #include <limits.h>
1.1 deraadt 58:
1.13 millert 59: #include <login_cap.h>
60: #include <bsd_auth.h>
1.7 millert 61:
1.1 deraadt 62: #define TIMEOUT 15
63:
1.15 millert 64: void bye(int);
65: void hi(int);
1.1 deraadt 66:
1.9 millert 67: int no_timeout; /* lock terminal forever */
1.1 deraadt 68:
1.13 millert 69: extern char *__progname;
70:
1.1 deraadt 71: /*ARGSUSED*/
1.9 millert 72: int
1.18 deraadt 73: main(int argc, char *argv[])
1.1 deraadt 74: {
1.28 deraadt 75: char hostname[HOST_NAME_MAX+1], s[BUFSIZ], s1[BUFSIZ], date[256];
1.18 deraadt 76: char *p, *style, *nstyle, *ttynam;
77: struct itimerval ntimer, otimer;
1.37 ! tedu 78: struct timeval timeout;
1.24 martynas 79: int ch, sectimeout, usemine, cnt, tries = 10, backoff = 3;
1.22 deraadt 80: const char *errstr;
1.1 deraadt 81: struct passwd *pw;
82: struct tm *timp;
83: time_t curtime;
1.13 millert 84: login_cap_t *lc;
1.1 deraadt 85:
86: sectimeout = TIMEOUT;
1.13 millert 87: style = NULL;
1.1 deraadt 88: usemine = 0;
1.6 downsj 89: no_timeout = 0;
1.37 ! tedu 90: memset(&timeout, 0, sizeof(timeout));
1.29 deraadt 91:
1.32 tedu 92: if (pledge("stdio rpath wpath getpw tty proc exec", NULL) == -1)
1.30 deraadt 93: err(1, "pledge");
1.1 deraadt 94:
95: if (!(pw = getpwuid(getuid())))
1.17 deraadt 96: errx(1, "unknown uid %u.", getuid());
1.13 millert 97:
98: lc = login_getclass(pw->pw_class);
1.24 martynas 99: if (lc != NULL) {
100: /*
101: * We allow "login-tries" attempts to login but start
102: * slowing down after "login-backoff" attempts.
103: */
104: tries = (int)login_getcapnum(lc, "login-tries", 10, 10);
105: backoff = (int)login_getcapnum(lc, "login-backoff", 3, 3);
106: }
107:
1.33 tedu 108: while ((ch = getopt(argc, argv, "a:npt:")) != -1) {
1.19 deraadt 109: switch (ch) {
1.13 millert 110: case 'a':
111: if (lc) {
112: style = login_getstyle(lc, optarg, "auth-lock");
113: if (style == NULL)
114: errx(1,
115: "invalid authentication style: %s",
116: optarg);
117: }
118: usemine = 1;
119: break;
1.1 deraadt 120: case 't':
1.23 deraadt 121: sectimeout = (int)strtonum(optarg, 1, INT_MAX, &errstr);
1.22 deraadt 122: if (errstr)
123: errx(1, "timeout %s: %s", errstr, optarg);
1.1 deraadt 124: break;
125: case 'p':
126: usemine = 1;
127: break;
1.6 downsj 128: case 'n':
129: no_timeout = 1;
130: break;
1.1 deraadt 131: default:
1.10 millert 132: (void)fprintf(stderr,
1.21 jmc 133: "usage: %s [-np] [-a style] [-t timeout]\n",
1.13 millert 134: __progname);
1.1 deraadt 135: exit(1);
1.33 tedu 136: }
1.1 deraadt 137: }
138: timeout.tv_sec = sectimeout * 60;
139:
140: gethostname(hostname, sizeof(hostname));
1.26 tobias 141: if (usemine && lc == NULL)
142: errx(1, "login class not found");
1.13 millert 143: if (!(ttynam = ttyname(STDIN_FILENO)))
1.1 deraadt 144: errx(1, "not a terminal?");
1.13 millert 145: curtime = time(NULL);
1.1 deraadt 146: timp = localtime(&curtime);
1.13 millert 147: strftime(date, sizeof(date), "%c", timp);
1.1 deraadt 148:
1.13 millert 149: if (!usemine) {
1.1 deraadt 150: /* get key and check again */
1.13 millert 151: if (!readpassphrase("Key: ", s, sizeof(s), RPP_ECHO_OFF) ||
152: *s == '\0')
153: exit(0);
1.1 deraadt 154: /*
155: * Don't need EOF test here, if we get EOF, then s1 != s
156: * and the right things will happen.
157: */
1.13 millert 158: (void)readpassphrase("Again: ", s1, sizeof(s1), RPP_ECHO_OFF);
1.1 deraadt 159: if (strcmp(s1, s)) {
1.13 millert 160: warnx("\apasswords didn't match.");
1.1 deraadt 161: exit(1);
162: }
1.34 mestre 163: explicit_bzero(s, sizeof(s));
1.1 deraadt 164: }
165:
166: /* set signal handlers */
167: (void)signal(SIGINT, hi);
168: (void)signal(SIGQUIT, hi);
169: (void)signal(SIGTSTP, hi);
170: (void)signal(SIGALRM, bye);
171:
1.37 ! tedu 172: memset(&ntimer, 0, sizeof(ntimer));
1.1 deraadt 173: ntimer.it_value = timeout;
1.6 downsj 174: if (!no_timeout)
175: setitimer(ITIMER_REAL, &ntimer, &otimer);
1.1 deraadt 176:
177: /* header info */
1.6 downsj 178: if (no_timeout) {
1.13 millert 179: (void)fprintf(stderr,
180: "%s: %s on %s. no timeout\ntime now is %s\n",
181: __progname, ttynam, hostname, date);
1.6 downsj 182: } else {
1.13 millert 183: (void)fprintf(stderr,
184: "%s: %s on %s. timeout in %d minutes\ntime now is %s\n",
185: __progname, ttynam, hostname, sectimeout, date);
1.6 downsj 186: }
1.1 deraadt 187:
1.24 martynas 188: for (cnt = 0;;) {
1.35 tedu 189: if (!readpassphrase("Key: ", s, sizeof(s), RPP_ECHO_OFF))
190: continue;
191: if (strlen(s) == 0) {
1.9 millert 192: hi(0);
1.1 deraadt 193: continue;
194: }
195: if (usemine) {
1.13 millert 196: /*
197: * If user entered 's/key' or the style specified via
198: * the '-a' argument, auth_userokay() will prompt
199: * for a new password. Otherwise, use what we have.
200: */
201: if ((strcmp(s, "s/key") == 0 &&
202: (nstyle = login_getstyle(lc, "skey", "auth-lock")))
203: || ((nstyle = style) && strcmp(s, nstyle) == 0))
204: p = NULL;
205: else
206: p = s;
1.34 mestre 207: if (auth_userokay(pw->pw_name, nstyle, "auth-lock",
208: p)) {
209: explicit_bzero(s, sizeof(s));
1.1 deraadt 210: break;
1.34 mestre 211: }
212: } else if (strcmp(s, s1) == 0) {
213: explicit_bzero(s, sizeof(s));
214: explicit_bzero(s1, sizeof(s1));
1.1 deraadt 215: break;
1.34 mestre 216: }
1.13 millert 217: (void)putc('\a', stderr);
1.24 martynas 218: cnt %= tries;
219: if (++cnt > backoff) {
220: sigset_t set, oset;
221: sigfillset(&set);
222: sigprocmask(SIG_BLOCK, &set, &oset);
223: sleep((u_int)((cnt - backoff) * tries / 2));
224: sigprocmask(SIG_SETMASK, &oset, NULL);
225: }
1.1 deraadt 226: }
1.9 millert 227:
1.13 millert 228: exit(0);
1.1 deraadt 229: }
230:
1.23 deraadt 231: /*ARGSUSED*/
1.1 deraadt 232: void
1.23 deraadt 233: hi(int signo)
1.1 deraadt 234: {
1.36 tedu 235: struct itimerval left;
1.1 deraadt 236:
1.36 tedu 237: (void)dprintf(STDERR_FILENO, "%s: type in the unlock key.", __progname);
238: if (!no_timeout) {
239: (void)getitimer(ITIMER_REAL, &left);
240: (void)dprintf(STDERR_FILENO, " timeout in %lld:%02d minutes",
241: (long long)(left.it_value.tv_sec / 60),
242: (int)(left.it_value.tv_sec % 60));
243: }
244: (void)dprintf(STDERR_FILENO, "\n");
1.1 deraadt 245: }
246:
1.23 deraadt 247: /*ARGSUSED*/
1.1 deraadt 248: void
1.23 deraadt 249: bye(int signo)
1.1 deraadt 250: {
251:
1.13 millert 252: if (!no_timeout)
1.16 millert 253: warnx("timeout");
254: _exit(1);
1.1 deraadt 255: }
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