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11db7fa42b
because the whole idea of this utility is rather broken.) This originally come from NetBSD, and was later reworked a bit. Reviewed by: des@ (earlier version) MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D4981
316 lines
8.1 KiB
C
316 lines
8.1 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1980, 1987, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Bob Toxen.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1980, 1987, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)lock.c 8.1 (Berkeley) 6/6/93";
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#endif
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#endif /* not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* Lock a terminal up until the given key is entered or the given
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* interval times out.
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*
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* Timeout interval is by default TIMEOUT, it can be changed with
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* an argument of the form -time where time is in minutes
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*/
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/signal.h>
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#include <sys/consio.h>
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#include <err.h>
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#include <ctype.h>
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#include <errno.h>
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#include <paths.h>
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#include <pwd.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <termios.h>
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#include <time.h>
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#include <unistd.h>
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#include <security/pam_appl.h>
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#include <security/openpam.h> /* for openpam_ttyconv() */
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#define TIMEOUT 15
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static void quit(int);
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static void bye(int);
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static void hi(int);
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static void usage(void);
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static struct timeval timeout;
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static struct timeval zerotime;
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static struct termios tty, ntty;
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static long nexttime; /* keep the timeout time */
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static int no_timeout; /* lock terminal forever */
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static int vtyunlock; /* Unlock flag and code. */
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/*ARGSUSED*/
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int
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main(int argc, char **argv)
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{
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static const struct pam_conv pamc = { &openpam_ttyconv, NULL };
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pam_handle_t *pamh;
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struct passwd *pw;
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struct itimerval ntimer, otimer;
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struct tm *timp;
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time_t timval;
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int ch, failures, pam_err, sectimeout, usemine, vtylock;
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char *ap, *ttynam, *tzn;
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char hostname[MAXHOSTNAMELEN], s[BUFSIZ], s1[BUFSIZ];
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openlog("lock", 0, LOG_AUTH);
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pam_err = PAM_SYSTEM_ERR; /* pacify GCC */
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sectimeout = TIMEOUT;
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pamh = NULL;
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pw = NULL;
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usemine = 0;
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no_timeout = 0;
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vtylock = 0;
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while ((ch = getopt(argc, argv, "npt:v")) != -1)
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switch((char)ch) {
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case 't':
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if ((sectimeout = atoi(optarg)) <= 0)
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errx(1, "illegal timeout value");
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break;
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case 'p':
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usemine = 1;
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if (!(pw = getpwuid(getuid())))
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errx(1, "unknown uid %d", getuid());
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break;
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case 'n':
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no_timeout = 1;
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break;
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case 'v':
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vtylock = 1;
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break;
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case '?':
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default:
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usage();
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}
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timeout.tv_sec = sectimeout * 60;
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if (!usemine) { /* -p with PAM or S/key needs privs */
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/* discard privs */
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if (setuid(getuid()) != 0)
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errx(1, "setuid failed");
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}
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if (tcgetattr(0, &tty)) /* get information for header */
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exit(1);
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gethostname(hostname, sizeof(hostname));
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if (!(ttynam = ttyname(0)))
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errx(1, "not a terminal?");
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if (strncmp(ttynam, _PATH_DEV, strlen(_PATH_DEV)) == 0)
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ttynam += strlen(_PATH_DEV);
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timval = time(NULL);
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nexttime = timval + (sectimeout * 60);
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timp = localtime(&timval);
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ap = asctime(timp);
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tzn = timp->tm_zone;
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(void)signal(SIGINT, quit);
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(void)signal(SIGQUIT, quit);
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ntty = tty; ntty.c_lflag &= ~ECHO;
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(void)tcsetattr(0, TCSADRAIN|TCSASOFT, &ntty);
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if (usemine) {
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pam_err = pam_start("lock", pw->pw_name, &pamc, &pamh);
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if (pam_err != PAM_SUCCESS)
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err(1, "pam_start: %s", pam_strerror(NULL, pam_err));
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} else {
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/* get key and check again */
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(void)printf("Key: ");
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if (!fgets(s, sizeof(s), stdin) || *s == '\n')
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quit(0);
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(void)printf("\nAgain: ");
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/*
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* Don't need EOF test here, if we get EOF, then s1 != s
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* and the right things will happen.
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*/
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(void)fgets(s1, sizeof(s1), stdin);
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(void)putchar('\n');
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if (strcmp(s1, s)) {
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(void)printf("\07lock: passwords didn't match.\n");
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(void)tcsetattr(0, TCSADRAIN|TCSASOFT, &tty);
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exit(1);
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}
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s[0] = '\0';
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}
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/* set signal handlers */
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(void)signal(SIGINT, hi);
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(void)signal(SIGQUIT, hi);
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(void)signal(SIGTSTP, hi);
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(void)signal(SIGALRM, bye);
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ntimer.it_interval = zerotime;
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ntimer.it_value = timeout;
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if (!no_timeout)
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setitimer(ITIMER_REAL, &ntimer, &otimer);
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if (vtylock) {
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/*
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* If this failed, we want to err out; warn isn't good
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* enough, since we don't want the user to think that
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* everything is nice and locked because they got a
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* "Key:" prompt.
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*/
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if (ioctl(0, VT_LOCKSWITCH, &vtylock) == -1) {
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(void)tcsetattr(0, TCSADRAIN|TCSASOFT, &tty);
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err(1, "locking vty");
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}
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vtyunlock = 0x2;
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}
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/* header info */
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if (pw != NULL)
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(void)printf("lock: %s using %s on %s.", pw->pw_name,
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ttynam, hostname);
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else
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(void)printf("lock: %s on %s.", ttynam, hostname);
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if (no_timeout)
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(void)printf(" no timeout.");
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else
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(void)printf(" timeout in %d minute%s.", sectimeout,
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sectimeout != 1 ? "s" : "");
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if (vtylock)
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(void)printf(" vty locked.");
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(void)printf("\ntime now is %.20s%s%s", ap, tzn, ap + 19);
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failures = 0;
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for (;;) {
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if (usemine) {
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pam_err = pam_authenticate(pamh, 0);
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if (pam_err == PAM_SUCCESS)
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break;
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if (pam_err != PAM_AUTH_ERR &&
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pam_err != PAM_USER_UNKNOWN &&
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pam_err != PAM_MAXTRIES) {
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syslog(LOG_ERR, "pam_authenticate: %s",
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pam_strerror(pamh, pam_err));
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}
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goto tryagain;
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}
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(void)printf("Key: ");
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if (!fgets(s, sizeof(s), stdin)) {
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clearerr(stdin);
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hi(0);
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goto tryagain;
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}
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if (!strcmp(s, s1))
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break;
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(void)printf("\07\n");
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failures++;
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if (getuid() == 0)
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syslog(LOG_NOTICE, "%d ROOT UNLOCK FAILURE%s (%s on %s)",
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failures, failures > 1 ? "S": "", ttynam, hostname);
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tryagain:
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if (tcgetattr(0, &ntty) && (errno != EINTR))
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exit(1);
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sleep(1); /* to discourage guessing */
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}
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if (getuid() == 0)
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syslog(LOG_NOTICE, "ROOT UNLOCK ON hostname %s port %s",
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hostname, ttynam);
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if (usemine)
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(void)pam_end(pamh, pam_err);
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quit(0);
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return(0); /* not reached */
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr, "usage: lock [-npv] [-t timeout]\n");
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exit(1);
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}
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static void
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hi(int signo __unused)
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{
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time_t timval;
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timval = time(NULL);
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(void)printf("lock: type in the unlock key. ");
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if (no_timeout) {
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(void)putchar('\n');
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} else {
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(void)printf("timeout in %jd:%jd minutes\n",
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(intmax_t)(nexttime - timval) / 60,
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(intmax_t)(nexttime - timval) % 60);
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}
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}
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static void
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quit(int signo __unused)
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{
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(void)putchar('\n');
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(void)tcsetattr(0, TCSADRAIN|TCSASOFT, &tty);
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if (vtyunlock)
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(void)ioctl(0, VT_LOCKSWITCH, &vtyunlock);
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exit(0);
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}
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static void
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bye(int signo __unused)
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{
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if (!no_timeout) {
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(void)tcsetattr(0, TCSADRAIN|TCSASOFT, &tty);
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if (vtyunlock)
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(void)ioctl(0, VT_LOCKSWITCH, &vtyunlock);
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(void)printf("lock: timeout\n");
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exit(1);
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}
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}
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