83274713b2
Accounts that have "pw_change" set, are supposed to change their passwords
by the date specified in "pw_change". If they have not changed their passwords
by that date, currently they get "LOCKED OUT" of the system. This is not the
correct behavior, the user should be prompt (forced?) to change their password
at this time. If the behavior of "pw_change" was meant to be a LOCKOUT,
then you should use "pw_expire".
Solution:
Instead of locking out the user, prompt them to change their password.
Reviewed by: jkh
Submitted by: rls
629 lines
15 KiB
C
629 lines
15 KiB
C
/*-
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* Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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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. All advertising materials mentioning features or use of this software
|
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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|
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#ifndef lint
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static char copyright[] =
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"@(#) Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994\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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|
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#ifndef lint
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static char sccsid[] = "@(#)login.c 8.4 (Berkeley) 4/2/94";
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#endif /* not lint */
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/*
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* login [ name ]
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* login -h hostname (for telnetd, etc.)
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* login -f name (for pre-authenticated login: datakit, xterm, etc.)
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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 <sys/resource.h>
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|
#include <sys/file.h>
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|
|
|
#include <err.h>
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|
#include <errno.h>
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|
#include <grp.h>
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#include <pwd.h>
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#include <setjmp.h>
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#include <signal.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 <ttyent.h>
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#include <tzfile.h>
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#include <unistd.h>
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#include <utmp.h>
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|
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#include "pathnames.h"
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void badlogin __P((char *));
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void checknologin __P((void));
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void dolastlog __P((int));
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void getloginname __P((void));
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void motd __P((void));
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void change_passwd __P((void));
|
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int rootterm __P((char *));
|
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void sigint __P((int));
|
|
void sleepexit __P((int));
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|
char *stypeof __P((char *));
|
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void timedout __P((int));
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void login_fbtab __P((char *, uid_t, gid_t));
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#ifdef KERBEROS
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int klogin __P((struct passwd *, char *, char *, char *));
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#endif
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|
|
|
extern void login __P((struct utmp *));
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|
|
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#define TTYGRPNAME "tty" /* name of group to own ttys */
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|
|
|
/*
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* This bounds the time given to login. Not a define so it can
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* be patched on machines where it's too small.
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*/
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u_int timeout = 300;
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|
|
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#ifdef KERBEROS
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int notickets = 1;
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char *instance;
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char *krbtkfile_env;
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int authok;
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#endif
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|
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struct passwd *pwd;
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int failures;
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char term[64], *envinit[1], *hostname, *username, *tty;
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|
|
|
int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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extern char **environ;
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struct group *gr;
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struct stat st;
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struct timeval tp;
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struct utmp utmp;
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int ask, ch, cnt, fflag, hflag, pflag, quietlog, rootlogin, rval;
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uid_t uid;
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char *domain, *p, *salt, *ttyn;
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char tbuf[MAXPATHLEN + 2], tname[sizeof(_PATH_TTY) + 10];
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char localhost[MAXHOSTNAMELEN];
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|
|
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(void)signal(SIGALRM, timedout);
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(void)alarm(timeout);
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(void)signal(SIGQUIT, SIG_IGN);
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(void)signal(SIGINT, SIG_IGN);
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(void)setpriority(PRIO_PROCESS, 0, 0);
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|
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openlog("login", LOG_ODELAY, LOG_AUTH);
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|
|
|
/*
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* -p is used by getty to tell login not to destroy the environment
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* -f is used to skip a second login authentication
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* -h is used by other servers to pass the name of the remote
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* host to login so that it may be placed in utmp and wtmp
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*/
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domain = NULL;
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if (gethostname(localhost, sizeof(localhost)) < 0)
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syslog(LOG_ERR, "couldn't get local hostname: %m");
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else
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domain = strchr(localhost, '.');
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fflag = hflag = pflag = 0;
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uid = getuid();
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while ((ch = getopt(argc, argv, "fh:p")) != EOF)
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|
switch (ch) {
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|
case 'f':
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|
fflag = 1;
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|
break;
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|
case 'h':
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if (uid)
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errx(1, "-h option: %s", strerror(EPERM));
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hflag = 1;
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if (domain && (p = strchr(optarg, '.')) &&
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strcasecmp(p, domain) == 0)
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*p = 0;
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hostname = optarg;
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break;
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case 'p':
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pflag = 1;
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break;
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case '?':
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default:
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if (!uid)
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syslog(LOG_ERR, "invalid flag %c", ch);
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(void)fprintf(stderr,
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"usage: login [-fp] [-h hostname] [username]\n");
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exit(1);
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}
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argc -= optind;
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argv += optind;
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|
|
|
if (*argv) {
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username = *argv;
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ask = 0;
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} else
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ask = 1;
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for (cnt = getdtablesize(); cnt > 2; cnt--)
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(void)close(cnt);
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ttyn = ttyname(STDIN_FILENO);
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|
if (ttyn == NULL || *ttyn == '\0') {
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(void)snprintf(tname, sizeof(tname), "%s??", _PATH_TTY);
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ttyn = tname;
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}
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if (tty = strrchr(ttyn, '/'))
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++tty;
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else
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tty = ttyn;
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for (cnt = 0;; ask = 1) {
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if (ask) {
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fflag = 0;
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getloginname();
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|
}
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rootlogin = 0;
|
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#ifdef KERBEROS
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if ((instance = strchr(username, '.')) != NULL) {
|
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if (strncmp(instance, ".root", 5) == 0)
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rootlogin = 1;
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*instance++ = '\0';
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|
} else
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instance = "";
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#endif
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if (strlen(username) > UT_NAMESIZE)
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|
username[UT_NAMESIZE] = '\0';
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|
|
/*
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* Note if trying multiple user names; log failures for
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* previous user name, but don't bother logging one failure
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* for nonexistent name (mistyped username).
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*/
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if (failures && strcmp(tbuf, username)) {
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|
if (failures > (pwd ? 0 : 1))
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badlogin(tbuf);
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failures = 0;
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|
}
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(void)strcpy(tbuf, username);
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|
|
if (pwd = getpwnam(username))
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salt = pwd->pw_passwd;
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else
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|
salt = "xx";
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|
|
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/*
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|
* if we have a valid account name, and it doesn't have a
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* password, or the -f option was specified and the caller
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|
* is root or the caller isn't changing their uid, don't
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|
* authenticate.
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|
*/
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|
if (pwd && (*pwd->pw_passwd == '\0' ||
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fflag && (uid == 0 || uid == pwd->pw_uid)))
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break;
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fflag = 0;
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if (pwd && pwd->pw_uid == 0)
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rootlogin = 1;
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(void)setpriority(PRIO_PROCESS, 0, -4);
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|
p = getpass("Password:");
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|
|
|
if (pwd) {
|
|
#ifdef KERBEROS
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rval = klogin(pwd, instance, localhost, p);
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if (rval != 0 && rootlogin && pwd->pw_uid != 0)
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|
rootlogin = 0;
|
|
if (rval == 0)
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authok = 1;
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|
else if (rval == 1)
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rval = strcmp(crypt(p, salt), pwd->pw_passwd);
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#else
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rval = strcmp(crypt(p, salt), pwd->pw_passwd);
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|
#endif
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|
}
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|
memset(p, 0, strlen(p));
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|
|
(void)setpriority(PRIO_PROCESS, 0, 0);
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|
|
/*
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|
* If trying to log in as root without Kerberos,
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* but with insecure terminal, refuse the login attempt.
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|
*/
|
|
#ifdef KERBEROS
|
|
if (authok == 0)
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|
#endif
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|
if (pwd && rootlogin && !rootterm(tty)) {
|
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(void)fprintf(stderr,
|
|
"%s login refused on this terminal.\n",
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|
pwd->pw_name);
|
|
if (hostname)
|
|
syslog(LOG_NOTICE,
|
|
"LOGIN %s REFUSED FROM %s ON TTY %s",
|
|
pwd->pw_name, hostname, tty);
|
|
else
|
|
syslog(LOG_NOTICE,
|
|
"LOGIN %s REFUSED ON TTY %s",
|
|
pwd->pw_name, tty);
|
|
continue;
|
|
}
|
|
|
|
if (pwd && !rval)
|
|
break;
|
|
|
|
(void)printf("Login incorrect\n");
|
|
failures++;
|
|
/* we allow 10 tries, but after 3 we start backing off */
|
|
if (++cnt > 3) {
|
|
if (cnt >= 10) {
|
|
badlogin(username);
|
|
sleepexit(1);
|
|
}
|
|
sleep((u_int)((cnt - 3) * 5));
|
|
}
|
|
}
|
|
|
|
/* committed to login -- turn off timeout */
|
|
(void)alarm((u_int)0);
|
|
|
|
endpwent();
|
|
|
|
/* if user not super-user, check for disabled logins */
|
|
if (!rootlogin)
|
|
checknologin();
|
|
|
|
if (chdir(pwd->pw_dir) < 0) {
|
|
(void)printf("No home directory %s!\n", pwd->pw_dir);
|
|
if (chdir("/"))
|
|
exit(0);
|
|
pwd->pw_dir = "/";
|
|
(void)printf("Logging in with home = \"/\".\n");
|
|
}
|
|
|
|
quietlog = access(_PATH_HUSHLOGIN, F_OK) == 0;
|
|
|
|
if (pwd->pw_change || pwd->pw_expire)
|
|
(void)gettimeofday(&tp, (struct timezone *)NULL);
|
|
|
|
if (pwd->pw_change)
|
|
if (tp.tv_sec >= pwd->pw_change) {
|
|
(void)printf("Sorry -- your password has expired.\n");
|
|
change_passwd();
|
|
} else if (pwd->pw_change - tp.tv_sec <
|
|
2 * DAYSPERWEEK * SECSPERDAY && !quietlog)
|
|
(void)printf("Warning: your password expires on %s",
|
|
ctime(&pwd->pw_change));
|
|
if (pwd->pw_expire)
|
|
if (tp.tv_sec >= pwd->pw_expire) {
|
|
(void)printf("Sorry -- your account has expired.\n");
|
|
sleepexit(1);
|
|
} else if (pwd->pw_expire - tp.tv_sec <
|
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2 * DAYSPERWEEK * SECSPERDAY && !quietlog)
|
|
(void)printf("Warning: your account expires on %s",
|
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ctime(&pwd->pw_expire));
|
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|
|
/* Nothing else left to fail -- really log in. */
|
|
memset((void *)&utmp, 0, sizeof(utmp));
|
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(void)time(&utmp.ut_time);
|
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(void)strncpy(utmp.ut_name, username, sizeof(utmp.ut_name));
|
|
if (hostname)
|
|
(void)strncpy(utmp.ut_host, hostname, sizeof(utmp.ut_host));
|
|
(void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line));
|
|
login(&utmp);
|
|
|
|
dolastlog(quietlog);
|
|
|
|
/*
|
|
* Set device protections, depending on what terminal the
|
|
* user is logged in. This feature is used on Suns to give
|
|
* console users better privacy.
|
|
*/
|
|
login_fbtab(tty, pwd->pw_uid, pwd->pw_gid);
|
|
|
|
(void)chown(ttyn, pwd->pw_uid,
|
|
(gr = getgrnam(TTYGRPNAME)) ? gr->gr_gid : pwd->pw_gid);
|
|
(void)setgid(pwd->pw_gid);
|
|
|
|
initgroups(username, pwd->pw_gid);
|
|
|
|
if (*pwd->pw_shell == '\0')
|
|
pwd->pw_shell = _PATH_BSHELL;
|
|
|
|
/* Destroy environment unless user has requested its preservation. */
|
|
if (!pflag)
|
|
environ = envinit;
|
|
(void)setenv("HOME", pwd->pw_dir, 1);
|
|
(void)setenv("SHELL", pwd->pw_shell, 1);
|
|
if (term[0] == '\0')
|
|
(void)strncpy(term, stypeof(tty), sizeof(term));
|
|
(void)setenv("TERM", term, 0);
|
|
(void)setenv("LOGNAME", pwd->pw_name, 1);
|
|
(void)setenv("USER", pwd->pw_name, 1);
|
|
(void)setenv("PATH", _PATH_DEFPATH, 0);
|
|
#ifdef KERBEROS
|
|
if (krbtkfile_env)
|
|
(void)setenv("KRBTKFILE", krbtkfile_env, 1);
|
|
#endif
|
|
|
|
if (tty[sizeof("tty")-1] == 'd')
|
|
syslog(LOG_INFO, "DIALUP %s, %s", tty, pwd->pw_name);
|
|
|
|
/* If fflag is on, assume caller/authenticator has logged root login. */
|
|
if (rootlogin && fflag == 0)
|
|
if (hostname)
|
|
syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s FROM %s",
|
|
username, tty, hostname);
|
|
else
|
|
syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s", username, tty);
|
|
|
|
#ifdef KERBEROS
|
|
if (!quietlog && notickets == 1)
|
|
(void)printf("Warning: no Kerberos tickets issued.\n");
|
|
#endif
|
|
|
|
if (!quietlog) {
|
|
(void)printf("%s\n\t%s %s\n\n",
|
|
"Copyright (c) 1980, 1983, 1986, 1988, 1990, 1991, 1993, 1994",
|
|
"The Regents of the University of California. ",
|
|
"All rights reserved.");
|
|
motd();
|
|
(void)snprintf(tbuf,
|
|
sizeof(tbuf), "%s/%s", _PATH_MAILDIR, pwd->pw_name);
|
|
if (stat(tbuf, &st) == 0 && st.st_size != 0)
|
|
(void)printf("You have %smail.\n",
|
|
(st.st_mtime > st.st_atime) ? "new " : "");
|
|
}
|
|
|
|
(void)signal(SIGALRM, SIG_DFL);
|
|
(void)signal(SIGQUIT, SIG_DFL);
|
|
(void)signal(SIGINT, SIG_DFL);
|
|
(void)signal(SIGTSTP, SIG_IGN);
|
|
|
|
tbuf[0] = '-';
|
|
(void)strcpy(tbuf + 1, (p = strrchr(pwd->pw_shell, '/')) ?
|
|
p + 1 : pwd->pw_shell);
|
|
|
|
if (setlogin(pwd->pw_name) < 0)
|
|
syslog(LOG_ERR, "setlogin() failure: %m");
|
|
|
|
/* Discard permissions last so can't get killed and drop core. */
|
|
if (rootlogin)
|
|
(void) setuid(0);
|
|
else
|
|
(void) setuid(pwd->pw_uid);
|
|
|
|
execlp(pwd->pw_shell, tbuf, 0);
|
|
err(1, "%s", pwd->pw_shell);
|
|
}
|
|
|
|
#ifdef KERBEROS
|
|
#define NBUFSIZ (UT_NAMESIZE + 1 + 5) /* .root suffix */
|
|
#else
|
|
#define NBUFSIZ (UT_NAMESIZE + 1)
|
|
#endif
|
|
|
|
void
|
|
getloginname()
|
|
{
|
|
int ch;
|
|
char *p;
|
|
static char nbuf[NBUFSIZ];
|
|
|
|
for (;;) {
|
|
(void)printf("login: ");
|
|
for (p = nbuf; (ch = getchar()) != '\n'; ) {
|
|
if (ch == EOF) {
|
|
badlogin(username);
|
|
exit(0);
|
|
}
|
|
if (p < nbuf + (NBUFSIZ - 1))
|
|
*p++ = ch;
|
|
}
|
|
if (p > nbuf)
|
|
if (nbuf[0] == '-')
|
|
(void)fprintf(stderr,
|
|
"login names may not start with '-'.\n");
|
|
else {
|
|
*p = '\0';
|
|
username = nbuf;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
int
|
|
rootterm(ttyn)
|
|
char *ttyn;
|
|
{
|
|
struct ttyent *t;
|
|
|
|
return ((t = getttynam(ttyn)) && t->ty_status & TTY_SECURE);
|
|
}
|
|
|
|
jmp_buf motdinterrupt;
|
|
|
|
void
|
|
motd()
|
|
{
|
|
int fd, nchars;
|
|
sig_t oldint;
|
|
char tbuf[8192];
|
|
|
|
if ((fd = open(_PATH_MOTDFILE, O_RDONLY, 0)) < 0)
|
|
return;
|
|
oldint = signal(SIGINT, sigint);
|
|
if (setjmp(motdinterrupt) == 0)
|
|
while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0)
|
|
(void)write(fileno(stdout), tbuf, nchars);
|
|
(void)signal(SIGINT, oldint);
|
|
(void)close(fd);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
void
|
|
sigint(signo)
|
|
int signo;
|
|
{
|
|
|
|
longjmp(motdinterrupt, 1);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
void
|
|
timedout(signo)
|
|
int signo;
|
|
{
|
|
|
|
(void)fprintf(stderr, "Login timed out after %d seconds\n", timeout);
|
|
exit(0);
|
|
}
|
|
|
|
void
|
|
checknologin()
|
|
{
|
|
int fd, nchars;
|
|
char tbuf[8192];
|
|
|
|
if ((fd = open(_PATH_NOLOGIN, O_RDONLY, 0)) >= 0) {
|
|
while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0)
|
|
(void)write(fileno(stdout), tbuf, nchars);
|
|
sleepexit(0);
|
|
}
|
|
}
|
|
|
|
void
|
|
dolastlog(quiet)
|
|
int quiet;
|
|
{
|
|
struct lastlog ll;
|
|
int fd;
|
|
|
|
if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) >= 0) {
|
|
(void)lseek(fd, (off_t)pwd->pw_uid * sizeof(ll), L_SET);
|
|
if (!quiet) {
|
|
if (read(fd, (char *)&ll, sizeof(ll)) == sizeof(ll) &&
|
|
ll.ll_time != 0) {
|
|
(void)printf("Last login: %.*s ",
|
|
24-5, (char *)ctime(&ll.ll_time));
|
|
if (*ll.ll_host != '\0')
|
|
(void)printf("from %.*s\n",
|
|
(int)sizeof(ll.ll_host),
|
|
ll.ll_host);
|
|
else
|
|
(void)printf("on %.*s\n",
|
|
(int)sizeof(ll.ll_line),
|
|
ll.ll_line);
|
|
}
|
|
(void)lseek(fd, (off_t)pwd->pw_uid * sizeof(ll), L_SET);
|
|
}
|
|
memset((void *)&ll, 0, sizeof(ll));
|
|
(void)time(&ll.ll_time);
|
|
(void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line));
|
|
if (hostname)
|
|
(void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host));
|
|
(void)write(fd, (char *)&ll, sizeof(ll));
|
|
(void)close(fd);
|
|
}
|
|
}
|
|
|
|
void
|
|
badlogin(name)
|
|
char *name;
|
|
{
|
|
|
|
if (failures == 0)
|
|
return;
|
|
if (hostname) {
|
|
syslog(LOG_NOTICE, "%d LOGIN FAILURE%s FROM %s",
|
|
failures, failures > 1 ? "S" : "", hostname);
|
|
syslog(LOG_AUTHPRIV|LOG_NOTICE,
|
|
"%d LOGIN FAILURE%s FROM %s, %s",
|
|
failures, failures > 1 ? "S" : "", hostname, name);
|
|
} else {
|
|
syslog(LOG_NOTICE, "%d LOGIN FAILURE%s ON %s",
|
|
failures, failures > 1 ? "S" : "", tty);
|
|
syslog(LOG_AUTHPRIV|LOG_NOTICE,
|
|
"%d LOGIN FAILURE%s ON %s, %s",
|
|
failures, failures > 1 ? "S" : "", tty, name);
|
|
}
|
|
}
|
|
|
|
#undef UNKNOWN
|
|
#define UNKNOWN "su"
|
|
|
|
char *
|
|
stypeof(ttyid)
|
|
char *ttyid;
|
|
{
|
|
struct ttyent *t;
|
|
|
|
return (ttyid && (t = getttynam(ttyid)) ? t->ty_type : UNKNOWN);
|
|
}
|
|
|
|
void
|
|
sleepexit(eval)
|
|
int eval;
|
|
{
|
|
|
|
(void)sleep(5);
|
|
exit(eval);
|
|
}
|
|
|
|
void
|
|
change_passwd()
|
|
{
|
|
int pid, status, w;
|
|
register void (*istat)(), (*qstat)();
|
|
|
|
if (( pid=fork() ) == 0)
|
|
{
|
|
execl( "/usr/bin/passwd", "passwd", NULL );
|
|
fprintf( stderr, "ERROR: Can't execute passwd!\n" );
|
|
sleepexit( 1 );
|
|
}
|
|
|
|
istat = signal( SIGINT, SIG_IGN );
|
|
qstat = signal( SIGQUIT, SIG_IGN );
|
|
|
|
while ((w = wait( &status )) != pid && w != -1)
|
|
;
|
|
|
|
signal( SIGINT, istat );
|
|
signal( SIGQUIT, qstat );
|
|
}
|
|
|