359 lines
8.9 KiB
C
359 lines
8.9 KiB
C
/* $NetBSD: lock.c,v 1.32 2012/03/20 20:34:58 matt Exp $ */
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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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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1980, 1987, 1993\
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The Regents of the University of California. All rights reserved.");
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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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__RCSID("$NetBSD: lock.c,v 1.32 2012/03/20 20:34:58 matt Exp $");
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#endif /* not lint */
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/*
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* Lock a terminal up until the given key is entered, until the root
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* password is entered, or the given 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/time.h>
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#include <signal.h>
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#include <err.h>
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#include <pwd.h>
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#include <errno.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 <termios.h>
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#include <time.h>
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#include <unistd.h>
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#ifdef USE_PAM
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#include <security/pam_appl.h>
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#include <security/openpam.h> /* for openpam_ttyconv() */
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#endif
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#ifdef SKEY
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#include <skey.h>
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#endif
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#define TIMEOUT 15
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int main(int, char **);
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static void bye(int) __dead;
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static void hi(int);
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static void quit(int) __dead;
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#ifdef SKEY
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static int skey_auth(const char *);
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#endif
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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 int notimeout; /* no timeout at all */
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static long nexttime; /* keep the timeout time */
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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 timeval timval;
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struct itimerval ntimer, otimer;
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struct tm *timp;
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time_t curtime;
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int ch, usemine;
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long sectimeout;
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char *ap, *mypw, *ttynam;
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const char *tzn;
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uid_t uid = getuid();
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char hostname[MAXHOSTNAMELEN + 1], s[BUFSIZ], s1[BUFSIZ];
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#ifdef USE_PAM
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pam_handle_t *pamh = NULL;
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static const struct pam_conv pamc = { &openpam_ttyconv, NULL };
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int pam_err;
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#endif
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if ((pw = getpwuid(getuid())) == NULL)
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errx(1, "unknown uid %lu.", (u_long)uid);
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notimeout = 0;
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sectimeout = TIMEOUT;
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mypw = NULL;
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usemine = 0;
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while ((ch = getopt(argc, argv, "npt:")) != -1)
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switch ((char)ch) {
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case 'n':
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notimeout = 1;
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break;
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case 't':
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errno = 0;
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if (((sectimeout = strtol(optarg, &ap, 0)) == LONG_MAX
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|| sectimeout == LONG_MIN)
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&& errno == ERANGE)
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err(1, "illegal timeout value: %s", optarg);
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if (optarg == ap || *ap || sectimeout <= 0)
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errx(1, "illegal timeout value: %s", optarg);
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if (sectimeout >= INT_MAX / 60)
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errx(1, "too large timeout value: %ld",
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sectimeout);
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break;
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case 'p':
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usemine = 1;
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#ifndef USE_PAM
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mypw = strdup(pw->pw_passwd);
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if (!mypw)
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err(1, "strdup");
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#endif
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break;
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case '?':
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default:
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(void)fprintf(stderr,
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"usage: %s [-np] [-t timeout]\n", getprogname());
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exit(1);
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}
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#if defined(USE_PAM) || defined(SKEY)
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if (! usemine) { /* -p with PAM or S/key needs privs */
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#endif
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if (setuid(uid) == -1) /* discard privs */
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err(1, "setuid failed");
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#if defined(USE_PAM) || defined(SKEY)
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}
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#endif
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timeout.tv_sec = (int)sectimeout * 60;
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if (tcgetattr(STDIN_FILENO, &tty) < 0) /* get information for header */
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err(1, "tcgetattr failed");
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gethostname(hostname, sizeof(hostname));
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hostname[sizeof(hostname) - 1] = '\0';
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if (!(ttynam = ttyname(STDIN_FILENO)))
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err(1, "ttyname failed");
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if (gettimeofday(&timval, NULL) == -1)
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err(1, "gettimeofday failed");
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curtime = timval.tv_sec;
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nexttime = timval.tv_sec + ((int)sectimeout * 60);
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timp = localtime(&curtime);
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ap = asctime(timp);
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#ifdef __SVR4
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tzn = tzname[0];
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#else
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tzn = timp->tm_zone;
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#endif
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if (signal(SIGINT, quit) == SIG_ERR)
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err(1, "signal failed");
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if (signal(SIGQUIT, quit) == SIG_ERR)
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err(1, "signal failed");
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ntty = tty; ntty.c_lflag &= ~ECHO;
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if (tcsetattr(STDIN_FILENO, TCSADRAIN, &ntty) == -1)
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err(1, "tcsetattr");
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if (!usemine) {
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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("\alock: passwords didn't match.\n");
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(void)tcsetattr(STDIN_FILENO, TCSADRAIN, &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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#ifdef USE_PAM
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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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}
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#endif
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/* set signal handlers */
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if (signal(SIGINT, hi) == SIG_ERR)
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err(1, "signal failed");
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if (signal(SIGQUIT, hi) == SIG_ERR)
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err(1, "signal failed");
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if (signal(SIGTSTP, hi) == SIG_ERR)
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err(1, "signal failed");
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if (notimeout) {
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if (signal(SIGALRM, hi) == SIG_ERR)
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err(1, "signal failed");
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(void)printf("lock: %s on %s. no timeout.\n"
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"time now is %.20s%s%s",
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ttynam, hostname, ap, tzn, ap + 19);
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}
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else {
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if (signal(SIGALRM, bye) == SIG_ERR)
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err(1, "signal failed");
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ntimer.it_interval = zerotime;
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ntimer.it_value = timeout;
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if (setitimer(ITIMER_REAL, &ntimer, &otimer) == -1)
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err(1, "setitimer failed");
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/* header info */
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(void)printf("lock: %s on %s. timeout in %ld minutes\n"
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"time now is %.20s%s%s",
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ttynam, hostname, sectimeout, ap, tzn, ap + 19);
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}
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for (;;) {
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#ifdef USE_PAM
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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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goto tryagain;
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}
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#endif
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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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#ifndef USE_PAM
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if (usemine) {
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s[strlen(s) - 1] = '\0';
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#ifdef SKEY
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if (strcasecmp(s, "s/key") == 0) {
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if (skey_auth(pw->pw_name))
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break;
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}
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#endif
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if (!strcmp(mypw, crypt(s, mypw)))
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break;
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}
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else
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#endif
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if (!strcmp(s, s1))
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break;
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(void)printf("\a\n");
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tryagain:
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if (tcsetattr(STDIN_FILENO, TCSADRAIN, &ntty) == -1
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&& errno != EINTR)
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err(1, "tcsetattr failed");
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}
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#ifdef USE_PAM
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if (usemine) {
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(void)pam_end(pamh, pam_err);
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}
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#endif
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quit(0);
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/* NOTREACHED */
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return 0;
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}
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#ifdef SKEY
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/*
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* We can't use libskey's skey_authenticate() since it
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* handles signals in a way that's inappropriate
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* for our needs. Instead we roll our own.
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*/
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static int
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skey_auth(const char *user)
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{
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char s[128];
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const char *ask;
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int ret = 0;
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if (!skey_haskey(user) && (ask = skey_keyinfo(user))) {
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(void)printf("\n[%s]\nResponse: ", ask);
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if (!fgets(s, sizeof(s), stdin) || *s == '\n')
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clearerr(stdin);
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else {
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s[strlen(s) - 1] = '\0';
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if (skey_passcheck(user, s) != -1)
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ret = 1;
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}
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} else
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(void)printf("Sorry, you have no s/key.\n");
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return ret;
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}
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#endif
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static void
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hi(int dummy)
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{
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struct timeval timval;
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if (notimeout)
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(void)printf("lock: type in the unlock key.\n");
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else {
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if (gettimeofday(&timval, NULL) == -1)
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err(1, "gettimeofday failed");
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(void)printf("lock: type in the unlock key. "
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"timeout in %lld:%lld minutes\n",
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(long long)(nexttime - timval.tv_sec) / 60,
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(long long)(nexttime - timval.tv_sec) % 60);
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}
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}
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static void
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quit(int dummy)
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{
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(void)putchar('\n');
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(void)tcsetattr(STDIN_FILENO, TCSADRAIN, &tty);
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exit(0);
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}
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static void
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bye(int dummy)
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{
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(void)tcsetattr(STDIN_FILENO, TCSADRAIN, &tty);
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(void)printf("lock: timeout\n");
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exit(1);
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}
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