8a16b7a18f
Mainly focus on files that use BSD 3-Clause license. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. Special thanks to Wind River for providing access to "The Duke of Highlander" tool: an older (2014) run over FreeBSD tree was useful as a starting point.
295 lines
7.5 KiB
C
295 lines
7.5 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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#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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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, sectimeout, usemine, vtylock;
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char *ap, *cryptpw, *mypw, *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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sectimeout = TIMEOUT;
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pw = NULL;
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mypw = 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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mypw = strdup(pw->pw_passwd);
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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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/* discard privs */
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if (setuid(getuid()) != 0)
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errx(1, "setuid failed");
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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 (!mypw) {
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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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mypw = s1;
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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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(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 (usemine) {
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s[strlen(s) - 1] = '\0';
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cryptpw = crypt(s, mypw);
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if (cryptpw != NULL && !strcmp(mypw, cryptpw))
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break;
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}
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else 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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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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