[apple/system_cmds.git] / login.tproj / login.c

/*
 * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*-
 * Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char copyright[] =
"@(#) Copyright (c) Apple Computer, Inc. 1997\n\n";
#endif /* not lint */

/*
 * login [ name ]
 * login -h hostname	(for telnetd, etc.)
 * login -f name	(for pre-authenticated login: datakit, xterm, etc.)
 */

#include <sys/param.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/file.h>
#include <sys/wait.h>

#include <err.h>
#include <errno.h>
#include <grp.h>
#include <pwd.h>
#include <setjmp.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <ttyent.h>
#include <tzfile.h>
#include <unistd.h>
#include <utmp.h>

#ifdef USE_PAM
#include <pam/pam_appl.h>
#include <pam/pam_misc.h>
#endif

#include "pathnames.h"

void	 badlogin __P((char *));
void	 checknologin __P((void));
void	 dolastlog __P((int));
void	 getloginname __P((void));
void	 motd __P((void));
int	 rootterm __P((char *));
void	 sigint __P((int));
void	 sleepexit __P((int));
char	*stypeof __P((char *));
void	 timedout __P((int));
#ifdef KERBEROS
int	 klogin __P((struct passwd *, char *, char *, char *));
#endif

extern void login __P((struct utmp *));

#define	TTYGRPNAME	"tty"		/* name of group to own ttys */

/*
 * This bounds the time given to login.  Not a define so it can
 * be patched on machines where it's too small.
 */
u_int	timeout = 300;

#ifdef KERBEROS
int	notickets = 1;
char	*instance;
char	*krbtkfile_env;
int	authok;
#endif

struct	passwd *pwd;
int	failures;
char	term[64], *hostname, *username = NULL, *tty;

int
main(argc, argv)
	int argc;
	char *argv[];
{
	extern char **environ;
	struct group *gr;
	struct stat st;
	struct timeval tp;
	struct utmp utmp;
	int ask, ch, cnt, fflag, hflag, pflag, quietlog, rootlogin = 0, rval;
	uid_t uid;
	uid_t euid;
	gid_t egid;
	char *domain, *p, *salt, *ttyn;
	char tbuf[MAXPATHLEN + 2], tname[sizeof(_PATH_TTY) + 10];
	char localhost[MAXHOSTNAMELEN];
#ifdef USE_PAM
	pam_handle_t *pamh = NULL;
	struct pam_conv conv = { misc_conv, NULL };
	char **pmenv;
	pid_t pid;
#endif

	(void)signal(SIGALRM, timedout);
	(void)alarm(timeout);
	(void)signal(SIGQUIT, SIG_IGN);
	(void)signal(SIGINT, SIG_IGN);
	(void)setpriority(PRIO_PROCESS, 0, 0);

	openlog("login", LOG_ODELAY, LOG_AUTH);

	/*
	 * -p is used by getty to tell login not to destroy the environment
	 * -f is used to skip a second login authentication
	 * -h is used by other servers to pass the name of the remote
	 *    host to login so that it may be placed in utmp and wtmp
	 */
	domain = NULL;
	if (gethostname(localhost, sizeof(localhost)) < 0)
		syslog(LOG_ERR, "couldn't get local hostname: %m");
	else
		domain = strchr(localhost, '.');
	
	euid = geteuid();
	egid = getegid();

	fflag = hflag = pflag = 0;
	uid = getuid();
	while ((ch = getopt(argc, argv, "fh:p")) != EOF)
		switch (ch) {
		case 'f':
			fflag = 1;
			break;
		case 'h':
			if (uid)
				errx(1, "-h option: %s", strerror(EPERM));
			hflag = 1;
			if (domain && (p = strchr(optarg, '.')) &&
			    strcasecmp(p, domain) == 0)
				*p = 0;
			hostname = optarg;
			break;
		case 'p':
			pflag = 1;
			break;
		case '?':
		default:
			if (!uid)
				syslog(LOG_ERR, "invalid flag %c", ch);
			(void)fprintf(stderr,
			    "usage: login [-fp] [-h hostname] [username]\n");
			exit(1);
		}
	argc -= optind;
	argv += optind;

	if (*argv) {
		username = *argv;
		ask = 0;
	} else
		ask = 1;

	for (cnt = getdtablesize(); cnt > 2; cnt--)
		(void)close(cnt);

	ttyn = ttyname(STDIN_FILENO);
	if (ttyn == NULL || *ttyn == '\0') {
		(void)snprintf(tname, sizeof(tname), "%s??", _PATH_TTY);
		ttyn = tname;
	}
	if (tty = strrchr(ttyn, '/'))
		++tty;
	else
		tty = ttyn;

#ifdef USE_PAM
	rval = pam_start("login", username, &conv, &pamh);
	if( rval != PAM_SUCCESS ) {
		fprintf(stderr, "login: PAM Error:  %s\n", pam_strerror(pamh, rval));
		exit(1);
	}
	rval = pam_set_item(pamh, PAM_TTY, tty);
	if( rval != PAM_SUCCESS ) {
		fprintf(stderr, "login: PAM Error: %s\n", pam_strerror(pamh, rval));
		exit(1);
	}

	rval = pam_set_item(pamh, PAM_RHOST, hostname);
	if( rval != PAM_SUCCESS ) {
		fprintf(stderr, "login: PAM Error: %s\n", pam_strerror(pamh, rval));
		exit(1);
	}

	rval = pam_set_item(pamh, PAM_USER_PROMPT, "login: ");
	if( rval != PAM_SUCCESS ) {
		fprintf(stderr, "login: PAM Error: %s\n", pam_strerror(pamh, rval));
		exit(1);
	}

	if( !username )
		getloginname();
	pam_set_item(pamh, PAM_USER, username);
	pwd = getpwnam(username);
	if( (pwd != NULL) && (pwd->pw_uid == 0) )
		rootlogin = 1;

	if( (pwd != NULL) && fflag && ((uid == 0) || (uid == pwd->pw_uid)) ){
		rval = 0;
	} else {

		rval = pam_authenticate(pamh, 0);
		while( (cnt++ < 10) && ((rval == PAM_AUTH_ERR) ||
				(rval == PAM_USER_UNKNOWN) ||
				(rval == PAM_CRED_INSUFFICIENT) ||
				(rval == PAM_AUTHINFO_UNAVAIL))) {
			badlogin(username);
			printf("Login incorrect\n");
			rootlogin = 0;
			getloginname();
			pwd = getpwnam(username);
			if( (pwd != NULL) && (pwd->pw_uid == 0) )
				rootlogin = 1;
			pam_set_item(pamh, PAM_USER, username);
			rval = pam_authenticate(pamh, 0);
		}

		if( rval != PAM_SUCCESS ) {
			pam_get_item(pamh, PAM_USER, (void *)&username);
			badlogin(username);
			printf("Login incorrect\n");
			exit(1);
		}

		rval = pam_acct_mgmt(pamh, 0);
		if( rval == PAM_NEW_AUTHTOK_REQD ) {
			rval = pam_chauthtok(pamh, PAM_CHANGE_EXPIRED_AUTHTOK);
		}
		if( rval != PAM_SUCCESS ) {
			fprintf(stderr, "login: PAM Error: %s\n", pam_strerror(pamh, rval));
			exit(1);
		}
	}

	rval = pam_get_item(pamh, PAM_USER, (void *)&username);
	if( (rval == PAM_SUCCESS) && username && *username) 
		pwd = getpwnam(username);

	rval = pam_open_session(pamh, 0);
	if( rval != PAM_SUCCESS ) {
		fprintf(stderr, "login: PAM Error: %s\n", pam_strerror(pamh, rval));
		exit(1);
	}

	rval = pam_setcred(pamh, PAM_ESTABLISH_CRED);
	if( rval != PAM_SUCCESS ) {
		fprintf(stderr, "login: PAM Error: %s\n", pam_strerror(pamh, rval));
		exit(1);
	}

#else /* USE_PAM */
	for (cnt = 0;; ask = 1) {
		if (ask) {
			fflag = 0;
			getloginname();
		}
		rootlogin = 0;
#ifdef	KERBEROS
		if ((instance = strchr(username, '.')) != NULL) {
			if (strncmp(instance, ".root", 5) == 0)
				rootlogin = 1;
			*instance++ = '\0';
		} else
			instance = "";
#endif
		if (strlen(username) > UT_NAMESIZE)
			username[UT_NAMESIZE] = '\0';

		/*
		 * Note if trying multiple user names; log failures for
		 * previous user name, but don't bother logging one failure
		 * for nonexistent name (mistyped username).
		 */
		if (failures && strcmp(tbuf, username)) {
			if (failures > (pwd ? 0 : 1))
				badlogin(tbuf);
			failures = 0;
		}
		(void)strcpy(tbuf, username);

		if (pwd = getpwnam(username))
			salt = pwd->pw_passwd;
		else
			salt = "xx";

		/*
		 * if we have a valid account name, and it doesn't have a
		 * password, or the -f option was specified and the caller
		 * is root or the caller isn't changing their uid, don't
		 * authenticate.
		 */
		if (pwd && (*pwd->pw_passwd == '\0' ||
		    fflag && (uid == 0 || uid == pwd->pw_uid)))
			break;
		fflag = 0;
		if (pwd && pwd->pw_uid == 0)
			rootlogin = 1;

		(void)setpriority(PRIO_PROCESS, 0, -4);

		p = getpass("Password:");

		if (pwd) {
#ifdef KERBEROS
			rval = klogin(pwd, instance, localhost, p);
			if (rval != 0 && rootlogin && pwd->pw_uid != 0)
				rootlogin = 0;
			if (rval == 0)
				authok = 1;
			else if (rval == 1)
				rval = strcmp(crypt(p, salt), pwd->pw_passwd);
#else
			rval = strcmp(crypt(p, salt), pwd->pw_passwd);
#endif
		}
		memset(p, 0, strlen(p));

		(void)setpriority(PRIO_PROCESS, 0, 0);

		/*
		 * If trying to log in as root without Kerberos,
		 * but with insecure terminal, refuse the login attempt.
		 */
#ifdef KERBEROS
		if (authok == 0)
#endif
		if (pwd && rootlogin && !rootterm(tty)) {
			(void)fprintf(stderr,
			    "%s login refused on this terminal.\n",
			    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));
		}
	}
#endif

	/* committed to login -- turn off timeout */
	(void)alarm((u_int)0);

	endpwent();

	/* if user not super-user, check for disabled logins */
	if (!rootlogin)
		checknologin();

	setegid(pwd->pw_gid);
	seteuid(rootlogin ? 0 : pwd->pw_uid);

      	/* First do a stat in case the homedir is automounted */
\r      	stat(pwd->pw_dir,&st);

	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");
	}
	seteuid(euid);
	setegid(egid);

	quietlog = access(_PATH_HUSHLOGIN, F_OK) == 0;

	/* Nothing else left to fail -- really log in. */
	memset((void *)&utmp, 0, sizeof(utmp));
	(void)time(&utmp.ut_time);
	(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);

	(void)chown(ttyn, pwd->pw_uid,
	    (gr = getgrnam(TTYGRPNAME)) ? gr->gr_gid : pwd->pw_gid);
	(void)chmod(ttyn, 0620);
	(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 = malloc(sizeof(char *));
		*environ = NULL;
	}
	(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

#ifdef USE_PAM
	pmenv = pam_getenvlist(pamh);
	for( cnt = 0; pmenv && pmenv[cnt]; cnt++ ) 
		putenv(pmenv[cnt]);

	pid = fork();
	if ( pid < 0 ) {
		err(1, "fork");
	} else if( pid != 0 ) {
		waitpid(pid, NULL, 0);
		pam_setcred(pamh, PAM_DELETE_CRED);
		rval = pam_close_session(pamh, 0);
		pam_end(pamh,rval);
		exit(0);
	}

#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) {
		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		(MAXLOGNAME + 1 + 5)	/* .root suffix */
#else
#define	NBUFSIZ		(MAXLOGNAME + 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);
}
Commit	Line	Data
1815bff5 A	1	/*
	2	* Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
6d658acd A	6	* Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
	7	*
	8	* This file contains Original Code and/or Modifications of Original Code
	9	* as defined in and that are subject to the Apple Public Source License
	10	* Version 2.0 (the 'License'). You may not use this file except in
	11	* compliance with the License. Please obtain a copy of the License at
	12	* http://www.opensource.apple.com/apsl/ and read it before using this
	13	* file.
1815bff5 A	14	*
	15	* The Original Code and all software distributed under the License are
	16	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	17	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	18	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
6d658acd A	19	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	20	* Please see the License for the specific language governing rights and
	21	* limitations under the License.
1815bff5 A	22	*
	23	* @APPLE_LICENSE_HEADER_END@
	24	*/
	25	/*-
	26	* Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994
	27	* The Regents of the University of California. All rights reserved.
	28	*
	29	* Redistribution and use in source and binary forms, with or without
	30	* modification, are permitted provided that the following conditions
	31	* are met:
	32	* 1. Redistributions of source code must retain the above copyright
	33	* notice, this list of conditions and the following disclaimer.
	34	* 2. Redistributions in binary form must reproduce the above copyright
	35	* notice, this list of conditions and the following disclaimer in the
	36	* documentation and/or other materials provided with the distribution.
	37	* 3. All advertising materials mentioning features or use of this software
	38	* must display the following acknowledgement:
	39	* This product includes software developed by the University of
	40	* California, Berkeley and its contributors.
	41	* 4. Neither the name of the University nor the names of its contributors
	42	* may be used to endorse or promote products derived from this software
	43	* without specific prior written permission.
	44	*
	45	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	46	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	47	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	48	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	49	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	50	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	51	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	52	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	53	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	54	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	55	* SUCH DAMAGE.
	56	*/
	57
	58	#ifndef lint
	59	static char copyright[] =
	60	"@(#) Copyright (c) Apple Computer, Inc. 1997\n\n";
	61	#endif /* not lint */
	62
	63	/*
	64	* login [ name ]
	65	* login -h hostname (for telnetd, etc.)
	66	* login -f name (for pre-authenticated login: datakit, xterm, etc.)
	67	*/
	68
	69	#include <sys/param.h>
	70	#include <sys/stat.h>
	71	#include <sys/time.h>
	72	#include <sys/resource.h>
	73	#include <sys/file.h>
b51d5b5f	74	#include <sys/wait.h>
1815bff5 A	75
	76	#include <err.h>
	77	#include <errno.h>
	78	#include <grp.h>
	79	#include <pwd.h>
	80	#include <setjmp.h>
	81	#include <signal.h>
	82	#include <stdio.h>
	83	#include <stdlib.h>
	84	#include <string.h>
	85	#include <syslog.h>
	86	#include <ttyent.h>
	87	#include <tzfile.h>
	88	#include <unistd.h>
	89	#include <utmp.h>
	90
b51d5b5f A	91	#ifdef USE_PAM
	92	#include <pam/pam_appl.h>
	93	#include <pam/pam_misc.h>
	94	#endif
	95
1815bff5 A	96	#include "pathnames.h"
	97
	98	void badlogin __P((char *));
	99	void checknologin __P((void));
	100	void dolastlog __P((int));
	101	void getloginname __P((void));
	102	void motd __P((void));
	103	int rootterm __P((char *));
	104	void sigint __P((int));
	105	void sleepexit __P((int));
	106	char stypeof __P((char ));
	107	void timedout __P((int));
	108	#ifdef KERBEROS
	109	int klogin __P((struct passwd , char , char , char ));
	110	#endif
	111
	112	extern void login __P((struct utmp *));
	113
	114	#define TTYGRPNAME "tty" /* name of group to own ttys */
	115
	116	/*
	117	* This bounds the time given to login. Not a define so it can
	118	* be patched on machines where it's too small.
	119	*/
	120	u_int timeout = 300;
	121
	122	#ifdef KERBEROS
	123	int notickets = 1;
	124	char *instance;
	125	char *krbtkfile_env;
	126	int authok;
	127	#endif
	128
	129	struct passwd *pwd;
	130	int failures;
b51d5b5f	131	char term[64], hostname, username = NULL, *tty;
1815bff5 A	132
	133	int
	134	main(argc, argv)
	135	int argc;
	136	char *argv[];
	137	{
	138	extern char **environ;
	139	struct group *gr;
	140	struct stat st;
	141	struct timeval tp;
	142	struct utmp utmp;
b51d5b5f	143	int ask, ch, cnt, fflag, hflag, pflag, quietlog, rootlogin = 0, rval;
1815bff5	144	uid_t uid;
b51d5b5f A	145	uid_t euid;
b51d5b5f A	146	gid_t egid;
1815bff5 A	147	char domain, p, salt, ttyn;
	148	char tbuf[MAXPATHLEN + 2], tname[sizeof(_PATH_TTY) + 10];
	149	char localhost[MAXHOSTNAMELEN];
b51d5b5f A	150	#ifdef USE_PAM
	151	pam_handle_t *pamh = NULL;
	152	struct pam_conv conv = { misc_conv, NULL };
	153	char **pmenv;
	154	pid_t pid;
	155	#endif
1815bff5 A	156
	157	(void)signal(SIGALRM, timedout);
	158	(void)alarm(timeout);
	159	(void)signal(SIGQUIT, SIG_IGN);
	160	(void)signal(SIGINT, SIG_IGN);
	161	(void)setpriority(PRIO_PROCESS, 0, 0);
	162
	163	openlog("login", LOG_ODELAY, LOG_AUTH);
	164
	165	/*
	166	* -p is used by getty to tell login not to destroy the environment
	167	* -f is used to skip a second login authentication
	168	* -h is used by other servers to pass the name of the remote
	169	* host to login so that it may be placed in utmp and wtmp
	170	*/
	171	domain = NULL;
	172	if (gethostname(localhost, sizeof(localhost)) < 0)
	173	syslog(LOG_ERR, "couldn't get local hostname: %m");
	174	else
	175	domain = strchr(localhost, '.');
b51d5b5f A	176
	177	euid = geteuid();
	178	egid = getegid();
1815bff5 A	179
	180	fflag = hflag = pflag = 0;
	181	uid = getuid();
	182	while ((ch = getopt(argc, argv, "fh:p")) != EOF)
	183	switch (ch) {
	184	case 'f':
	185	fflag = 1;
	186	break;
	187	case 'h':
	188	if (uid)
	189	errx(1, "-h option: %s", strerror(EPERM));
	190	hflag = 1;
	191	if (domain && (p = strchr(optarg, '.')) &&
	192	strcasecmp(p, domain) == 0)
	193	*p = 0;
	194	hostname = optarg;
	195	break;
	196	case 'p':
	197	pflag = 1;
	198	break;
	199	case '?':
	200	default:
	201	if (!uid)
	202	syslog(LOG_ERR, "invalid flag %c", ch);
	203	(void)fprintf(stderr,
	204	"usage: login [-fp] [-h hostname] [username]\n");
	205	exit(1);
	206	}
	207	argc -= optind;
	208	argv += optind;
	209
	210	if (*argv) {
	211	username = *argv;
	212	ask = 0;
	213	} else
	214	ask = 1;
	215
	216	for (cnt = getdtablesize(); cnt > 2; cnt--)
	217	(void)close(cnt);
	218
	219	ttyn = ttyname(STDIN_FILENO);
	220	if (ttyn == NULL \|\| *ttyn == '\0') {
	221	(void)snprintf(tname, sizeof(tname), "%s??", _PATH_TTY);
	222	ttyn = tname;
	223	}
	224	if (tty = strrchr(ttyn, '/'))
	225	++tty;
	226	else
	227	tty = ttyn;
	228
b51d5b5f A	229	#ifdef USE_PAM
	230	rval = pam_start("login", username, &conv, &pamh);
	231	if( rval != PAM_SUCCESS ) {
	232	fprintf(stderr, "login: PAM Error: %s\n", pam_strerror(pamh, rval));
	233	exit(1);
	234	}
	235	rval = pam_set_item(pamh, PAM_TTY, tty);
	236	if( rval != PAM_SUCCESS ) {
	237	fprintf(stderr, "login: PAM Error: %s\n", pam_strerror(pamh, rval));
	238	exit(1);
	239	}
	240
	241	rval = pam_set_item(pamh, PAM_RHOST, hostname);
	242	if( rval != PAM_SUCCESS ) {
	243	fprintf(stderr, "login: PAM Error: %s\n", pam_strerror(pamh, rval));
	244	exit(1);
	245	}
	246
	247	rval = pam_set_item(pamh, PAM_USER_PROMPT, "login: ");
	248	if( rval != PAM_SUCCESS ) {
	249	fprintf(stderr, "login: PAM Error: %s\n", pam_strerror(pamh, rval));
	250	exit(1);
	251	}
	252
	253	if( !username )
	254	getloginname();
	255	pam_set_item(pamh, PAM_USER, username);
	256	pwd = getpwnam(username);
	257	if( (pwd != NULL) && (pwd->pw_uid == 0) )
	258	rootlogin = 1;
	259
	260	if( (pwd != NULL) && fflag && ((uid == 0) \|\| (uid == pwd->pw_uid)) ){
	261	rval = 0;
	262	} else {
	263
	264	rval = pam_authenticate(pamh, 0);
	265	while( (cnt++ < 10) && ((rval == PAM_AUTH_ERR) \|\|
	266	(rval == PAM_USER_UNKNOWN) \|\|
	267	(rval == PAM_CRED_INSUFFICIENT) \|\|
	268	(rval == PAM_AUTHINFO_UNAVAIL))) {
	269	badlogin(username);
	270	printf("Login incorrect\n");
	271	rootlogin = 0;
	272	getloginname();
	273	pwd = getpwnam(username);
	274	if( (pwd != NULL) && (pwd->pw_uid == 0) )
	275	rootlogin = 1;
	276	pam_set_item(pamh, PAM_USER, username);
	277	rval = pam_authenticate(pamh, 0);
	278	}
	279
	280	if( rval != PAM_SUCCESS ) {
	281	pam_get_item(pamh, PAM_USER, (void *)&username);
	282	badlogin(username);
	283	printf("Login incorrect\n");
	284	exit(1);
	285	}
	286
	287	rval = pam_acct_mgmt(pamh, 0);
	288	if( rval == PAM_NEW_AUTHTOK_REQD ) {
	289	rval = pam_chauthtok(pamh, PAM_CHANGE_EXPIRED_AUTHTOK);
	290	}
	291	if( rval != PAM_SUCCESS ) {
	292	fprintf(stderr, "login: PAM Error: %s\n", pam_strerror(pamh, rval));
293	exit(1);
294	}
295	}
296
297	rval = pam_get_item(pamh, PAM_USER, (void *)&username);
298	if( (rval == PAM_SUCCESS) && username && *username)
299	pwd = getpwnam(username);
300
301	rval = pam_open_session(pamh, 0);
302	if( rval != PAM_SUCCESS ) {
303	fprintf(stderr, "login: PAM Error: %s\n", pam_strerror(pamh, rval));
304	exit(1);
305	}
306
307	rval = pam_setcred(pamh, PAM_ESTABLISH_CRED);
308	if( rval != PAM_SUCCESS ) {
309	fprintf(stderr, "login: PAM Error: %s\n", pam_strerror(pamh, rval));
310	exit(1);
311	}
312
313	#else /* USE_PAM */
1815bff5 A	314	for (cnt = 0;; ask = 1) {
	315	if (ask) {
	316	fflag = 0;
	317	getloginname();
	318	}
	319	rootlogin = 0;
	320	#ifdef KERBEROS
	321	if ((instance = strchr(username, '.')) != NULL) {
	322	if (strncmp(instance, ".root", 5) == 0)
	323	rootlogin = 1;
	324	*instance++ = '\0';
	325	} else
	326	instance = "";
	327	#endif
	328	if (strlen(username) > UT_NAMESIZE)
	329	username[UT_NAMESIZE] = '\0';
	330
	331	/*
	332	* Note if trying multiple user names; log failures for
	333	* previous user name, but don't bother logging one failure
	334	* for nonexistent name (mistyped username).
	335	*/
	336	if (failures && strcmp(tbuf, username)) {
	337	if (failures > (pwd ? 0 : 1))
	338	badlogin(tbuf);
	339	failures = 0;
	340	}
	341	(void)strcpy(tbuf, username);
	342
	343	if (pwd = getpwnam(username))
	344	salt = pwd->pw_passwd;
	345	else
	346	salt = "xx";
	347
	348	/*
	349	* if we have a valid account name, and it doesn't have a
	350	* password, or the -f option was specified and the caller
	351	* is root or the caller isn't changing their uid, don't
	352	* authenticate.
	353	*/
	354	if (pwd && (*pwd->pw_passwd == '\0' \|\|
	355	fflag && (uid == 0 \|\| uid == pwd->pw_uid)))
	356	break;
	357	fflag = 0;
	358	if (pwd && pwd->pw_uid == 0)
	359	rootlogin = 1;
	360
	361	(void)setpriority(PRIO_PROCESS, 0, -4);
	362
	363	p = getpass("Password:");
	364
	365	if (pwd) {
	366	#ifdef KERBEROS
	367	rval = klogin(pwd, instance, localhost, p);
	368	if (rval != 0 && rootlogin && pwd->pw_uid != 0)
	369	rootlogin = 0;
	370	if (rval == 0)
	371	authok = 1;
	372	else if (rval == 1)
	373	rval = strcmp(crypt(p, salt), pwd->pw_passwd);
	374	#else
	375	rval = strcmp(crypt(p, salt), pwd->pw_passwd);
	376	#endif
	377	}
378	memset(p, 0, strlen(p));
379
380	(void)setpriority(PRIO_PROCESS, 0, 0);
381
382	/*
383	* If trying to log in as root without Kerberos,
384	* but with insecure terminal, refuse the login attempt.
385	*/
386	#ifdef KERBEROS
387	if (authok == 0)
388	#endif
389	if (pwd && rootlogin && !rootterm(tty)) {
390	(void)fprintf(stderr,
391	"%s login refused on this terminal.\n",
392	pwd->pw_name);
393	if (hostname)
394	syslog(LOG_NOTICE,
395	"LOGIN %s REFUSED FROM %s ON TTY %s",
396	pwd->pw_name, hostname, tty);
397	else
398	syslog(LOG_NOTICE,
399	"LOGIN %s REFUSED ON TTY %s",
400	pwd->pw_name, tty);
401	continue;
402	}
403
404	if (pwd && !rval)
405	break;
406
407	(void)printf("Login incorrect\n");
408	failures++;
409	/* we allow 10 tries, but after 3 we start backing off */
410	if (++cnt > 3) {
411	if (cnt >= 10) {
412	badlogin(username);
413	sleepexit(1);
414	}
415	sleep((u_int)((cnt - 3) * 5));
416	}
417	}
b51d5b5f	418	#endif
1815bff5 A	419
	420	/* committed to login -- turn off timeout */
	421	(void)alarm((u_int)0);
	422
	423	endpwent();
	424
	425	/* if user not super-user, check for disabled logins */
	426	if (!rootlogin)
	427	checknologin();
	428
b51d5b5f A	429	setegid(pwd->pw_gid);
	430	seteuid(rootlogin ? 0 : pwd->pw_uid);
	431
	432	/* First do a stat in case the homedir is automounted */
	433	\r stat(pwd->pw_dir,&st);
	434
1815bff5 A	435	if (chdir(pwd->pw_dir) < 0) {
	436	(void)printf("No home directory %s!\n", pwd->pw_dir);
	437	if (chdir("/"))
	438	exit(0);
	439	pwd->pw_dir = "/";
	440	(void)printf("Logging in with home = \"/\".\n");
	441	}
b51d5b5f A	442	seteuid(euid);
b51d5b5f A	443	setegid(egid);
1815bff5 A	444
	445	quietlog = access(_PATH_HUSHLOGIN, F_OK) == 0;
	446
1815bff5 A	447	/* Nothing else left to fail -- really log in. */
	448	memset((void *)&utmp, 0, sizeof(utmp));
	449	(void)time(&utmp.ut_time);
	450	(void)strncpy(utmp.ut_name, username, sizeof(utmp.ut_name));
	451	if (hostname)
	452	(void)strncpy(utmp.ut_host, hostname, sizeof(utmp.ut_host));
	453	(void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line));
	454	login(&utmp);
	455
	456	dolastlog(quietlog);
	457
	458	(void)chown(ttyn, pwd->pw_uid,
	459	(gr = getgrnam(TTYGRPNAME)) ? gr->gr_gid : pwd->pw_gid);
1c51fdde	460	(void)chmod(ttyn, 0620);
1815bff5 A	461	(void)setgid(pwd->pw_gid);
	462
	463	initgroups(username, pwd->pw_gid);
	464
	465	if (*pwd->pw_shell == '\0')
	466	pwd->pw_shell = _PATH_BSHELL;
	467
	468	/* Destroy environment unless user has requested its preservation. */
b51d5b5f A	469	if (!pflag) {
	470	environ = malloc(sizeof(char *));
	471	*environ = NULL;
	472	}
1815bff5 A	473	(void)setenv("HOME", pwd->pw_dir, 1);
	474	(void)setenv("SHELL", pwd->pw_shell, 1);
	475	if (term[0] == '\0')
	476	(void)strncpy(term, stypeof(tty), sizeof(term));
	477	(void)setenv("TERM", term, 0);
	478	(void)setenv("LOGNAME", pwd->pw_name, 1);
	479	(void)setenv("USER", pwd->pw_name, 1);
	480	(void)setenv("PATH", _PATH_DEFPATH, 0);
	481	#ifdef KERBEROS
	482	if (krbtkfile_env)
	483	(void)setenv("KRBTKFILE", krbtkfile_env, 1);
	484	#endif
	485
b51d5b5f A	486	#ifdef USE_PAM
	487	pmenv = pam_getenvlist(pamh);
	488	for( cnt = 0; pmenv && pmenv[cnt]; cnt++ )
	489	putenv(pmenv[cnt]);
	490
	491	pid = fork();
	492	if ( pid < 0 ) {
	493	err(1, "fork");
	494	} else if( pid != 0 ) {
	495	waitpid(pid, NULL, 0);
	496	pam_setcred(pamh, PAM_DELETE_CRED);
	497	rval = pam_close_session(pamh, 0);
	498	pam_end(pamh,rval);
	499	exit(0);
	500	}
	501
	502	#endif
	503
1815bff5 A	504	if (tty[sizeof("tty")-1] == 'd')
	505	syslog(LOG_INFO, "DIALUP %s, %s", tty, pwd->pw_name);
	506
	507	/* If fflag is on, assume caller/authenticator has logged root login. */
	508	if (rootlogin && fflag == 0)
	509	if (hostname)
	510	syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s FROM %s",
	511	username, tty, hostname);
	512	else
	513	syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s", username, tty);
	514
	515	#ifdef KERBEROS
	516	if (!quietlog && notickets == 1)
	517	(void)printf("Warning: no Kerberos tickets issued.\n");
	518	#endif
	519
	520	if (!quietlog) {
	521	motd();
	522	(void)snprintf(tbuf,
	523	sizeof(tbuf), "%s/%s", _PATH_MAILDIR, pwd->pw_name);
	524	if (stat(tbuf, &st) == 0 && st.st_size != 0)
	525	(void)printf("You have %smail.\n",
	526	(st.st_mtime > st.st_atime) ? "new " : "");
	527	}
	528
	529	(void)signal(SIGALRM, SIG_DFL);
	530	(void)signal(SIGQUIT, SIG_DFL);
	531	(void)signal(SIGINT, SIG_DFL);
	532	(void)signal(SIGTSTP, SIG_IGN);
	533
	534	tbuf[0] = '-';
	535	(void)strcpy(tbuf + 1, (p = strrchr(pwd->pw_shell, '/')) ?
	536	p + 1 : pwd->pw_shell);
	537
	538	if (setlogin(pwd->pw_name) < 0)
	539	syslog(LOG_ERR, "setlogin() failure: %m");
	540
	541	/* Discard permissions last so can't get killed and drop core. */
	542	if (rootlogin)
	543	(void) setuid(0);
	544	else
	545	(void) setuid(pwd->pw_uid);
	546
	547	execlp(pwd->pw_shell, tbuf, 0);
	548	err(1, "%s", pwd->pw_shell);
	549	}
	550
	551	#ifdef KERBEROS
b51d5b5f	552	#define NBUFSIZ (MAXLOGNAME + 1 + 5) /* .root suffix */
1815bff5	553	#else
b51d5b5f	554	#define NBUFSIZ (MAXLOGNAME + 1)
1815bff5 A	555	#endif
	556
	557	void
	558	getloginname()
	559	{
	560	int ch;
	561	char *p;
	562	static char nbuf[NBUFSIZ];
	563
	564	for (;;) {
	565	(void)printf("login: ");
	566	for (p = nbuf; (ch = getchar()) != '\n'; ) {
	567	if (ch == EOF) {
	568	badlogin(username);
	569	exit(0);
	570	}
	571	if (p < nbuf + (NBUFSIZ - 1))
	572	*p++ = ch;
	573	}
b51d5b5f	574	if (p > nbuf) {
1815bff5 A	575	if (nbuf[0] == '-')
	576	(void)fprintf(stderr,
	577	"login names may not start with '-'.\n");
	578	else {
	579	*p = '\0';
	580	username = nbuf;
	581	break;
	582	}
b51d5b5f	583	}
1815bff5 A	584	}
	585	}
	586
	587	int
	588	rootterm(ttyn)
	589	char *ttyn;
	590	{
	591	struct ttyent *t;
	592
	593	return ((t = getttynam(ttyn)) && t->ty_status & TTY_SECURE);
	594	}
	595
	596	jmp_buf motdinterrupt;
	597
	598	void
	599	motd()
	600	{
	601	int fd, nchars;
	602	sig_t oldint;
	603	char tbuf[8192];
	604
	605	if ((fd = open(_PATH_MOTDFILE, O_RDONLY, 0)) < 0)
	606	return;
	607	oldint = signal(SIGINT, sigint);
	608	if (setjmp(motdinterrupt) == 0)
	609	while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0)
	610	(void)write(fileno(stdout), tbuf, nchars);
	611	(void)signal(SIGINT, oldint);
	612	(void)close(fd);
	613	}
	614
	615	/* ARGSUSED */
	616	void
	617	sigint(signo)
	618	int signo;
	619	{
	620
	621	longjmp(motdinterrupt, 1);
	622	}
	623
	624	/* ARGSUSED */
	625	void
	626	timedout(signo)
	627	int signo;
	628	{
	629
	630	(void)fprintf(stderr, "Login timed out after %d seconds\n", timeout);
	631	exit(0);
	632	}
	633
	634	void
	635	checknologin()
	636	{
	637	int fd, nchars;
	638	char tbuf[8192];
	639
	640	if ((fd = open(_PATH_NOLOGIN, O_RDONLY, 0)) >= 0) {
	641	while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0)
	642	(void)write(fileno(stdout), tbuf, nchars);
	643	sleepexit(0);
	644	}
	645	}
	646
	647	void
648	dolastlog(quiet)
649	int quiet;
650	{
651	struct lastlog ll;
652	int fd;
653
654	if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) >= 0) {
655	(void)lseek(fd, (off_t)pwd->pw_uid * sizeof(ll), L_SET);
656	if (!quiet) {
657	if (read(fd, (char *)&ll, sizeof(ll)) == sizeof(ll) &&
658	ll.ll_time != 0) {
659	(void)printf("Last login: %.*s ",
660	24-5, (char *)ctime(&ll.ll_time));
661	if (*ll.ll_host != '\0')
662	(void)printf("from %.*s\n",
663	(int)sizeof(ll.ll_host),
664	ll.ll_host);
665	else
666	(void)printf("on %.*s\n",
667	(int)sizeof(ll.ll_line),
668	ll.ll_line);
669	}
670	(void)lseek(fd, (off_t)pwd->pw_uid * sizeof(ll), L_SET);
671	}
672	memset((void *)&ll, 0, sizeof(ll));
673	(void)time(&ll.ll_time);
674	(void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line));
675	if (hostname)
676	(void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host));
677	(void)write(fd, (char *)&ll, sizeof(ll));
678	(void)close(fd);
679	}
680	}
681
682	void
683	badlogin(name)
684	char *name;
685	{
686
687	if (failures == 0)
688	return;
689	if (hostname) {
690	syslog(LOG_NOTICE, "%d LOGIN FAILURE%s FROM %s",
691	failures, failures > 1 ? "S" : "", hostname);
692	syslog(LOG_AUTHPRIV\|LOG_NOTICE,
693	"%d LOGIN FAILURE%s FROM %s, %s",
694	failures, failures > 1 ? "S" : "", hostname, name);
695	} else {
696	syslog(LOG_NOTICE, "%d LOGIN FAILURE%s ON %s",
697	failures, failures > 1 ? "S" : "", tty);
698	syslog(LOG_AUTHPRIV\|LOG_NOTICE,
699	"%d LOGIN FAILURE%s ON %s, %s",
700	failures, failures > 1 ? "S" : "", tty, name);
701	}
702	}
703
704	#undef UNKNOWN
705	#define UNKNOWN "su"
706
707	char *
708	stypeof(ttyid)
709	char *ttyid;
710	{
711	struct ttyent *t;
712
713	return (ttyid && (t = getttynam(ttyid)) ? t->ty_type : UNKNOWN);
714	}
715
716	void
717	sleepexit(eval)
718	int eval;
719	{
720
721	(void)sleep(5);
722	exit(eval);
723	}