Annotation of src/usr.bin/lock/lock.c, Revision 1.38
1.38 ! tedu 1: /* $OpenBSD: lock.c,v 1.37 2017/07/08 22:14:48 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];
1.38 ! tedu 76: char hash[_PASSWORD_LEN];
1.18 deraadt 77: char *p, *style, *nstyle, *ttynam;
78: struct itimerval ntimer, otimer;
1.37 tedu 79: struct timeval timeout;
1.24 martynas 80: int ch, sectimeout, usemine, cnt, tries = 10, backoff = 3;
1.22 deraadt 81: const char *errstr;
1.1 deraadt 82: struct passwd *pw;
83: struct tm *timp;
84: time_t curtime;
1.13 millert 85: login_cap_t *lc;
1.1 deraadt 86:
87: sectimeout = TIMEOUT;
1.13 millert 88: style = NULL;
1.1 deraadt 89: usemine = 0;
1.6 downsj 90: no_timeout = 0;
1.37 tedu 91: memset(&timeout, 0, sizeof(timeout));
1.29 deraadt 92:
1.32 tedu 93: if (pledge("stdio rpath wpath getpw tty proc exec", NULL) == -1)
1.30 deraadt 94: err(1, "pledge");
1.1 deraadt 95:
96: if (!(pw = getpwuid(getuid())))
1.17 deraadt 97: errx(1, "unknown uid %u.", getuid());
1.13 millert 98:
99: lc = login_getclass(pw->pw_class);
1.24 martynas 100: if (lc != NULL) {
101: /*
102: * We allow "login-tries" attempts to login but start
103: * slowing down after "login-backoff" attempts.
104: */
105: tries = (int)login_getcapnum(lc, "login-tries", 10, 10);
106: backoff = (int)login_getcapnum(lc, "login-backoff", 3, 3);
107: }
108:
1.33 tedu 109: while ((ch = getopt(argc, argv, "a:npt:")) != -1) {
1.19 deraadt 110: switch (ch) {
1.13 millert 111: case 'a':
112: if (lc) {
113: style = login_getstyle(lc, optarg, "auth-lock");
114: if (style == NULL)
115: errx(1,
116: "invalid authentication style: %s",
117: optarg);
118: }
119: usemine = 1;
120: break;
1.1 deraadt 121: case 't':
1.23 deraadt 122: sectimeout = (int)strtonum(optarg, 1, INT_MAX, &errstr);
1.22 deraadt 123: if (errstr)
124: errx(1, "timeout %s: %s", errstr, optarg);
1.1 deraadt 125: break;
126: case 'p':
127: usemine = 1;
128: break;
1.6 downsj 129: case 'n':
130: no_timeout = 1;
131: break;
1.1 deraadt 132: default:
1.10 millert 133: (void)fprintf(stderr,
1.21 jmc 134: "usage: %s [-np] [-a style] [-t timeout]\n",
1.13 millert 135: __progname);
1.1 deraadt 136: exit(1);
1.33 tedu 137: }
1.1 deraadt 138: }
139: timeout.tv_sec = sectimeout * 60;
140:
141: gethostname(hostname, sizeof(hostname));
1.26 tobias 142: if (usemine && lc == NULL)
143: errx(1, "login class not found");
1.13 millert 144: if (!(ttynam = ttyname(STDIN_FILENO)))
1.1 deraadt 145: errx(1, "not a terminal?");
1.13 millert 146: curtime = time(NULL);
1.1 deraadt 147: timp = localtime(&curtime);
1.13 millert 148: strftime(date, sizeof(date), "%c", timp);
1.1 deraadt 149:
1.13 millert 150: if (!usemine) {
1.1 deraadt 151: /* get key and check again */
1.13 millert 152: if (!readpassphrase("Key: ", s, sizeof(s), RPP_ECHO_OFF) ||
153: *s == '\0')
154: exit(0);
1.1 deraadt 155: /*
156: * Don't need EOF test here, if we get EOF, then s1 != s
157: * and the right things will happen.
158: */
1.13 millert 159: (void)readpassphrase("Again: ", s1, sizeof(s1), RPP_ECHO_OFF);
1.1 deraadt 160: if (strcmp(s1, s)) {
1.13 millert 161: warnx("\apasswords didn't match.");
1.1 deraadt 162: exit(1);
163: }
1.38 ! tedu 164: crypt_newhash(s, "bcrypt", hash, sizeof(hash));
1.34 mestre 165: explicit_bzero(s, sizeof(s));
1.38 ! tedu 166: explicit_bzero(s1, sizeof(s1));
1.1 deraadt 167: }
168:
169: /* set signal handlers */
170: (void)signal(SIGINT, hi);
171: (void)signal(SIGQUIT, hi);
172: (void)signal(SIGTSTP, hi);
173: (void)signal(SIGALRM, bye);
174:
1.37 tedu 175: memset(&ntimer, 0, sizeof(ntimer));
1.1 deraadt 176: ntimer.it_value = timeout;
1.6 downsj 177: if (!no_timeout)
178: setitimer(ITIMER_REAL, &ntimer, &otimer);
1.1 deraadt 179:
180: /* header info */
1.6 downsj 181: if (no_timeout) {
1.13 millert 182: (void)fprintf(stderr,
183: "%s: %s on %s. no timeout\ntime now is %s\n",
184: __progname, ttynam, hostname, date);
1.6 downsj 185: } else {
1.13 millert 186: (void)fprintf(stderr,
187: "%s: %s on %s. timeout in %d minutes\ntime now is %s\n",
188: __progname, ttynam, hostname, sectimeout, date);
1.6 downsj 189: }
1.1 deraadt 190:
1.24 martynas 191: for (cnt = 0;;) {
1.35 tedu 192: if (!readpassphrase("Key: ", s, sizeof(s), RPP_ECHO_OFF))
193: continue;
194: if (strlen(s) == 0) {
1.9 millert 195: hi(0);
1.1 deraadt 196: continue;
197: }
198: if (usemine) {
1.13 millert 199: /*
200: * If user entered 's/key' or the style specified via
201: * the '-a' argument, auth_userokay() will prompt
202: * for a new password. Otherwise, use what we have.
203: */
204: if ((strcmp(s, "s/key") == 0 &&
205: (nstyle = login_getstyle(lc, "skey", "auth-lock")))
206: || ((nstyle = style) && strcmp(s, nstyle) == 0))
207: p = NULL;
208: else
209: p = s;
1.34 mestre 210: if (auth_userokay(pw->pw_name, nstyle, "auth-lock",
211: p)) {
212: explicit_bzero(s, sizeof(s));
1.1 deraadt 213: break;
1.34 mestre 214: }
1.38 ! tedu 215: } else if (crypt_checkpass(s, hash) == 0) {
1.34 mestre 216: explicit_bzero(s, sizeof(s));
217: explicit_bzero(s1, sizeof(s1));
1.1 deraadt 218: break;
1.34 mestre 219: }
1.13 millert 220: (void)putc('\a', stderr);
1.24 martynas 221: cnt %= tries;
222: if (++cnt > backoff) {
223: sigset_t set, oset;
224: sigfillset(&set);
225: sigprocmask(SIG_BLOCK, &set, &oset);
226: sleep((u_int)((cnt - backoff) * tries / 2));
227: sigprocmask(SIG_SETMASK, &oset, NULL);
228: }
1.1 deraadt 229: }
1.9 millert 230:
1.13 millert 231: exit(0);
1.1 deraadt 232: }
233:
1.23 deraadt 234: /*ARGSUSED*/
1.1 deraadt 235: void
1.23 deraadt 236: hi(int signo)
1.1 deraadt 237: {
1.36 tedu 238: struct itimerval left;
1.1 deraadt 239:
1.36 tedu 240: (void)dprintf(STDERR_FILENO, "%s: type in the unlock key.", __progname);
241: if (!no_timeout) {
242: (void)getitimer(ITIMER_REAL, &left);
243: (void)dprintf(STDERR_FILENO, " timeout in %lld:%02d minutes",
244: (long long)(left.it_value.tv_sec / 60),
245: (int)(left.it_value.tv_sec % 60));
246: }
247: (void)dprintf(STDERR_FILENO, "\n");
1.1 deraadt 248: }
249:
1.23 deraadt 250: /*ARGSUSED*/
1.1 deraadt 251: void
1.23 deraadt 252: bye(int signo)
1.1 deraadt 253: {
254:
1.13 millert 255: if (!no_timeout)
1.16 millert 256: warnx("timeout");
257: _exit(1);
1.1 deraadt 258: }