[openssh.git] / login.c

/*
 * 
 * login.c
 * 
 * Author: Tatu Ylonen <ylo@cs.hut.fi>
 * 
 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
 *                    All rights reserved
 * 
 * Created: Fri Mar 24 14:51:08 1995 ylo
 * 
 * This file performs some of the things login(1) normally does.  We cannot
 * easily use something like login -p -h host -f user, because there are
 * several different logins around, and it is hard to determined what kind of
 * login the current system has.  Also, we want to be able to execute commands
 * on a tty.
 * 
 */

#include "includes.h"
RCSID("$Id$");

#if defined(HAVE_UTMPX_H) && defined(USE_UTMPX)
# include <utmpx.h>
#endif
#ifdef HAVE_UTMP_H
# include <utmp.h>
#endif
#include "ssh.h"

#ifdef HAVE_UTIL_H
# include <util.h>
#endif
#ifdef HAVE_LASTLOG_H
# include <lastlog.h>
#endif
#ifdef HAVE_LOGIN_H
# include <login.h>
#endif

/*
 * Returns the time when the user last logged in.  Returns 0 if the
 * information is not available.  This must be called before record_login.
 * The host the user logged in from will be returned in buf.
 */

/*
 * Returns the time when the user last logged in (or 0 if no previous login
 * is found).  The name of the host used last time is returned in buf.
 */

unsigned long 
get_last_login_time(uid_t uid, const char *logname,
		    char *buf, unsigned int bufsize)
{
#if defined(_PATH_LASTLOG) && !defined(DISABLE_LASTLOG)
	struct lastlog ll;
	char *lastlog;
	int fd;
#ifdef LASTLOG_IS_DIR
	char buf[1024];
#endif /* LASTLOG_IS_DIR */

	lastlog = _PATH_LASTLOG;
	buf[0] = '\0';

#ifdef LASTLOG_IS_DIR
	fd = open(lastlog, O_RDONLY);
	if (fd < 0)
		return 0;
	lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET);
#else /* LASTLOG_IS_DIR */
	snprintf(buf, sizeof(buf), "%s/%s", lastlog, logname);
	fd = open(buf, O_RDONLY);
	if (fd < 0)
		return 0;
#endif /* LASTLOG_IS_DIR */
	if (read(fd, &ll, sizeof(ll)) != sizeof(ll)) {
		close(fd);
		return 0;
	}
	close(fd);
	if (bufsize > sizeof(ll.ll_host) + 1)
		bufsize = sizeof(ll.ll_host) + 1;
	strncpy(buf, ll.ll_host, bufsize - 1);
	buf[bufsize - 1] = 0;
	return ll.ll_time;

#else /* defined(_PATH_LASTLOG) && !defined(DISABLE_LASTLOG) */
	/* Look in wtmp for the last login */
	struct utmp  wt;
	char        *wt_file = _PATH_WTMP;
	int         fd1;
	unsigned long t = 0;

	if ( (fd1 = open(wt_file, O_RDONLY)) < 0 ) {
		error("Couldn't open %.100s to find last login time.", wt_file);
		return 0;
	}

	/* seek to last record of file */
	lseek(fd1, (off_t)(0-sizeof(struct utmp)), SEEK_END);

	/* loop through wtmp for our last user login record */
	do {
		if (read(fd1, &wt, sizeof(wt)) != sizeof(wt)) {
			close(fd1);
			return 0;
		}

		if ( wt.ut_type == USER_PROCESS) {
			if ( !strncmp(logname, wt.ut_user, 8) ) {
				t = (unsigned long) wt.ut_time;
#ifdef HAVE_HOST_IN_UTMP
				if (bufsize > sizeof(wt.ut_host) + 1)
				bufsize = sizeof(wt.ut_host) + 1;
				strncpy(buf, wt.ut_host, bufsize - 1);
				buf[bufsize - 1] = 0;
#else /* HAVE_HOST_IN_UTMP */
				buf[0] = 0;
#endif /* HAVE_HOST_IN_UTMP */
			}
		}

		if (lseek(fd1, (off_t)(0-2*sizeof(struct utmp)), SEEK_CUR) == -1)
			break;
	} while (t == 0);

	return t;
#endif /* defined(_PATH_LASTLOG) && !defined(DISABLE_LASTLOG) */
}

/*
 * Records that the user has logged in.  I these parts of operating systems
 * were more standardized.
 */

void 
record_login(int pid, const char *ttyname, const char *user, uid_t uid,
	     const char *host, struct sockaddr_in * addr)
{
#if defined(_PATH_LASTLOG) && !defined(DISABLE_LASTLOG)
	struct lastlog ll;
	char *lastlog;
#ifdef LASTLOG_IS_DIR
	char buf[1024];
#endif /* LASTLOG_IS_DIR */
#endif /* defined(_PATH_LASTLOG) && !defined(DISABLE_LASTLOG) */
	struct utmp u;
#if defined(HAVE_UTMPX_H) && defined(USE_UTMPX)
	struct utmpx utx;
#endif

	/* Construct an utmp/wtmp entry. */
	memset(&u, 0, sizeof(u));
	strncpy(u.ut_line, ttyname + 5, sizeof(u.ut_line));
#if defined(HAVE_ID_IN_UTMP)
	strncpy(u.ut_id, ttyname + 8, sizeof(u.ut_id));
#endif /* defined(HAVE_ID_IN_UTMP) */ 
	strncpy(u.ut_name, user, sizeof(u.ut_name));
#if defined(HAVE_TV_IN_UTMP)
	(void)gettimeofday(&u.ut_tv, NULL);
#else /* defined(HAVE_TV_IN_UTMP) */
	u.ut_time = time(NULL);
#endif /* defined(HAVE_TV_IN_UTMP) */
#if defined(HAVE_PID_IN_UTMP)
	u.ut_pid = (pid_t)pid;
#endif /* HAVE_PID_IN_UTMP */
#if defined(HAVE_TYPE_IN_UTMP)
 	u.ut_type = (uid == -1)?DEAD_PROCESS:USER_PROCESS;
#endif /* HAVE_TYPE_IN_UTMP */
#if defined(HAVE_HOST_IN_UTMP)
	strncpy(u.ut_host, host, sizeof(u.ut_host));
#endif
#if defined(HAVE_ADDR_IN_UTMP)
	u.ut_addr = addr->sin_addr.s_addr;
#endif

#if defined(HAVE_UTMPX_H) && defined(USE_UTMPX)
	memset(&utx, 0, sizeof(utx));
	strncpy(utx.ut_user, user, sizeof(utx.ut_name));
	strncpy(utx.ut_line, ttyname + 5, sizeof(utx.ut_line));
	strncpy(utx.ut_id, ttyname + 8, sizeof(utx.ut_id));
	utx.ut_pid = (pid_t)pid;
	(void)gettimeofday(&utx.ut_tv, NULL);
 	utx.ut_type = (uid == -1)?DEAD_PROCESS:USER_PROCESS;
# ifdef HAVE_HOST_IN_UTMPX
#  ifdef HAVE_SYSLEN_IN_UTMPX
	utx.ut_syslen = strlen(host);
	strncpy(utx.ut_host, host, utx.ut_syslen);
#  else
	strncpy(utx.ut_host, host, sizeof(utx.ut_host));
#  endif /* HAVE_SYSLEN_IN_UTMPX */
# endif
# if defined(HAVE_ADDR_IN_UTMPX)
	utx.ut_addr = addr->sin_addr.s_addr;
# endif
#endif /* defined(HAVE_UTMPX_H) && defined(USE_UTMPX) */

/*#if defined(HAVE_UTMPX_H) && defined(USE_UTMPX) && !defined(HAVE_LOGIN)*/
#if defined(HAVE_UTMPX_H) && defined(USE_UTMPX)
	login(&u, &utx);
#else /* defined(HAVE_UTMPX_H) && defined(USE_UTMPX) */
	login(&u);
#endif /* defined(HAVE_UTMPX_H) && defined(USE_UTMPX) */

#if defined(_PATH_LASTLOG) && !defined(DISABLE_LASTLOG)
	lastlog = _PATH_LASTLOG;

	/* Update lastlog unless actually recording a logout. */
	if (strcmp(user, "") != 0) {
		int fd;
		/*
		 * It is safer to bzero the lastlog structure first because
		 * some systems might have some extra fields in it (e.g. SGI)
		 */
		memset(&ll, 0, sizeof(ll));

		/* Update lastlog. */
		ll.ll_time = time(NULL);
		strncpy(ll.ll_line, ttyname + 5, sizeof(ll.ll_line));
		strncpy(ll.ll_host, host, sizeof(ll.ll_host));
#ifdef LASTLOG_IS_DIR
		snprintf(buf, sizeof(buf), "%s/%s", lastlog, logname);
		fd = open(buf, O_RDWR);
		if (fd >= 0) {
#else /* LASTLOG_IS_DIR */
		fd = open(lastlog, O_RDWR);
		if (fd >= 0) {
			lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET);
#endif /* LASTLOG_IS_DIR */
			if (write(fd, &ll, sizeof(ll)) != sizeof(ll))
				log("Could not write %.100s: %.100s", lastlog, strerror(errno));
			close(fd);
		}
	}
#endif /* defined(_PATH_LASTLOG) && !defined(DISABLE_LASTLOG) */
}

/* Records that the user has logged out. */

void 
record_logout(int pid, const char *ttyname)
{
#ifdef HAVE_LIBUTIL_LOGIN
	const char *line = ttyname + 5;	/* /dev/ttyq8 -> ttyq8 */
	if (logout(line))
		logwtmp(line, "", "");
#else /* HAVE_LIBUTIL_LOGIN */
	record_login(pid, ttyname, "", -1, "", NULL);
#endif /* HAVE_LIBUTIL_LOGIN */
}
Commit	Line	Data
8efc0c15	1	/*
5260325f	2	*
	3	* login.c
	4	*
	5	* Author: Tatu Ylonen <ylo@cs.hut.fi>
	6	*
	7	* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
	8	* All rights reserved
	9	*
	10	* Created: Fri Mar 24 14:51:08 1995 ylo
	11	*
	12	* This file performs some of the things login(1) normally does. We cannot
	13	* easily use something like login -p -h host -f user, because there are
	14	* several different logins around, and it is hard to determined what kind of
	15	* login the current system has. Also, we want to be able to execute commands
	16	* on a tty.
	17	*
	18	*/
8efc0c15	19
	20	#include "includes.h"
	21	RCSID("$Id$");
	22
92f90c57	23	#if defined(HAVE_UTMPX_H) && defined(USE_UTMPX)
8946db53	24	# include <utmpx.h>
	25	#endif
	26	#ifdef HAVE_UTMP_H
	27	# include <utmp.h>
	28	#endif
5260325f	29	#include "ssh.h"
4cca272e	30
5260325f	31	#ifdef HAVE_UTIL_H
	32	# include <util.h>
	33	#endif
4cca272e	34	#ifdef HAVE_LASTLOG_H
	35	# include <lastlog.h>
	36	#endif
09041313	37	#ifdef HAVE_LOGIN_H
	38	# include <login.h>
	39	#endif
4cca272e	40
aa3378df	41	/*
	42	* Returns the time when the user last logged in. Returns 0 if the
	43	* information is not available. This must be called before record_login.
	44	* The host the user logged in from will be returned in buf.
	45	*/
8efc0c15	46
aa3378df	47	/*
	48	* Returns the time when the user last logged in (or 0 if no previous login
	49	* is found). The name of the host used last time is returned in buf.
	50	*/
8efc0c15	51
5260325f	52	unsigned long
	53	get_last_login_time(uid_t uid, const char *logname,
	54	char *buf, unsigned int bufsize)
8efc0c15	55	{
ae28776a	56	#if defined(_PATH_LASTLOG) && !defined(DISABLE_LASTLOG)
5260325f	57	struct lastlog ll;
	58	char *lastlog;
	59	int fd;
76a8e733	60	#ifdef LASTLOG_IS_DIR
	61	char buf[1024];
	62	#endif /* LASTLOG_IS_DIR */
5260325f	63
	64	lastlog = _PATH_LASTLOG;
	65	buf[0] = '\0';
	66
76a8e733	67	#ifdef LASTLOG_IS_DIR
5260325f	68	fd = open(lastlog, O_RDONLY);
	69	if (fd < 0)
	70	return 0;
	71	lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET);
76a8e733	72	#else /* LASTLOG_IS_DIR */
	73	snprintf(buf, sizeof(buf), "%s/%s", lastlog, logname);
	74	fd = open(buf, O_RDONLY);
	75	if (fd < 0)
	76	return 0;
	77	#endif /* LASTLOG_IS_DIR */
5260325f	78	if (read(fd, &ll, sizeof(ll)) != sizeof(ll)) {
	79	close(fd);
	80	return 0;
	81	}
	82	close(fd);
	83	if (bufsize > sizeof(ll.ll_host) + 1)
	84	bufsize = sizeof(ll.ll_host) + 1;
	85	strncpy(buf, ll.ll_host, bufsize - 1);
	86	buf[bufsize - 1] = 0;
	87	return ll.ll_time;
a7effaac	88
ae28776a	89	#else /* defined(_PATH_LASTLOG) && !defined(DISABLE_LASTLOG) */
a7effaac	90	/* Look in wtmp for the last login */
	91	struct utmp wt;
	92	char *wt_file = _PATH_WTMP;
	93	int fd1;
	94	unsigned long t = 0;
	95
	96	if ( (fd1 = open(wt_file, O_RDONLY)) < 0 ) {
	97	error("Couldn't open %.100s to find last login time.", wt_file);
	98	return 0;
	99	}
	100
	101	/* seek to last record of file */
	102	lseek(fd1, (off_t)(0-sizeof(struct utmp)), SEEK_END);
	103
	104	/* loop through wtmp for our last user login record */
	105	do {
	106	if (read(fd1, &wt, sizeof(wt)) != sizeof(wt)) {
	107	close(fd1);
	108	return 0;
	109	}
	110
	111	if ( wt.ut_type == USER_PROCESS) {
	112	if ( !strncmp(logname, wt.ut_user, 8) ) {
	113	t = (unsigned long) wt.ut_time;
ae28776a	114	#ifdef HAVE_HOST_IN_UTMP
a7effaac	115	if (bufsize > sizeof(wt.ut_host) + 1)
	116	bufsize = sizeof(wt.ut_host) + 1;
	117	strncpy(buf, wt.ut_host, bufsize - 1);
	118	buf[bufsize - 1] = 0;
ae28776a	119	#else /* HAVE_HOST_IN_UTMP */
	120	buf[0] = 0;
	121	#endif /* HAVE_HOST_IN_UTMP */
a7effaac	122	}
	123	}
	124
	125	if (lseek(fd1, (off_t)(0-2*sizeof(struct utmp)), SEEK_CUR) == -1)
	126	break;
	127	} while (t == 0);
	128
	129	return t;
ae28776a	130	#endif /* defined(_PATH_LASTLOG) && !defined(DISABLE_LASTLOG) */
8efc0c15	131	}
8efc0c15	132
aa3378df	133	/*
	134	* Records that the user has logged in. I these parts of operating systems
	135	* were more standardized.
	136	*/
8efc0c15	137
5260325f	138	void
	139	record_login(int pid, const char ttyname, const char user, uid_t uid,
	140	const char host, struct sockaddr_in addr)
8efc0c15	141	{
ae28776a	142	#if defined(_PATH_LASTLOG) && !defined(DISABLE_LASTLOG)
5260325f	143	struct lastlog ll;
5260325f	144	char *lastlog;
76a8e733	145	#ifdef LASTLOG_IS_DIR
	146	char buf[1024];
	147	#endif /* LASTLOG_IS_DIR */
ae28776a	148	#endif /* defined(_PATH_LASTLOG) && !defined(DISABLE_LASTLOG) */
f498ed15	149	struct utmp u;
	150	#if defined(HAVE_UTMPX_H) && defined(USE_UTMPX)
	151	struct utmpx utx;
	152	#endif
5260325f	153
	154	/* Construct an utmp/wtmp entry. */
	155	memset(&u, 0, sizeof(u));
	156	strncpy(u.ut_line, ttyname + 5, sizeof(u.ut_line));
c73a0cb5	157	#if defined(HAVE_ID_IN_UTMP)
21feb5fa	158	strncpy(u.ut_id, ttyname + 8, sizeof(u.ut_id));
c73a0cb5	159	#endif /* defined(HAVE_ID_IN_UTMP) */
5260325f	160	strncpy(u.ut_name, user, sizeof(u.ut_name));
70e0115b	161	#if defined(HAVE_TV_IN_UTMP)
	162	(void)gettimeofday(&u.ut_tv, NULL);
	163	#else /* defined(HAVE_TV_IN_UTMP) */
	164	u.ut_time = time(NULL);
	165	#endif /* defined(HAVE_TV_IN_UTMP) */
	166	#if defined(HAVE_PID_IN_UTMP)
	167	u.ut_pid = (pid_t)pid;
	168	#endif /* HAVE_PID_IN_UTMP */
	169	#if defined(HAVE_TYPE_IN_UTMP)
f498ed15	170	u.ut_type = (uid == -1)?DEAD_PROCESS:USER_PROCESS;
70e0115b	171	#endif /* HAVE_TYPE_IN_UTMP */
f498ed15	172	#if defined(HAVE_HOST_IN_UTMP)
5260325f	173	strncpy(u.ut_host, host, sizeof(u.ut_host));
4cca272e	174	#endif
4811cc0b	175	#if defined(HAVE_ADDR_IN_UTMP)
	176	u.ut_addr = addr->sin_addr.s_addr;
	177	#endif
8efc0c15	178
f498ed15	179	#if defined(HAVE_UTMPX_H) && defined(USE_UTMPX)
	180	memset(&utx, 0, sizeof(utx));
	181	strncpy(utx.ut_user, user, sizeof(utx.ut_name));
	182	strncpy(utx.ut_line, ttyname + 5, sizeof(utx.ut_line));
21feb5fa	183	strncpy(utx.ut_id, ttyname + 8, sizeof(utx.ut_id));
f498ed15	184	utx.ut_pid = (pid_t)pid;
70e0115b	185	(void)gettimeofday(&utx.ut_tv, NULL);
f74efc8d	186	utx.ut_type = (uid == -1)?DEAD_PROCESS:USER_PROCESS;
	187	# ifdef HAVE_HOST_IN_UTMPX
	188	# ifdef HAVE_SYSLEN_IN_UTMPX
f498ed15	189	utx.ut_syslen = strlen(host);
f74efc8d	190	strncpy(utx.ut_host, host, utx.ut_syslen);
f74efc8d	191	# else
f498ed15	192	strncpy(utx.ut_host, host, sizeof(utx.ut_host));
f74efc8d	193	# endif /* HAVE_SYSLEN_IN_UTMPX */
f74efc8d	194	# endif
4811cc0b	195	# if defined(HAVE_ADDR_IN_UTMPX)
	196	utx.ut_addr = addr->sin_addr.s_addr;
	197	# endif
f498ed15	198	#endif /* defined(HAVE_UTMPX_H) && defined(USE_UTMPX) */
5260325f	199
f74efc8d	200	/#if defined(HAVE_UTMPX_H) && defined(USE_UTMPX) && !defined(HAVE_LOGIN)/
f74efc8d	201	#if defined(HAVE_UTMPX_H) && defined(USE_UTMPX)
f498ed15	202	login(&u, &utx);
f498ed15	203	#else /* defined(HAVE_UTMPX_H) && defined(USE_UTMPX) */
5260325f	204	login(&u);
f498ed15	205	#endif /* defined(HAVE_UTMPX_H) && defined(USE_UTMPX) */
a7effaac	206
ae28776a	207	#if defined(_PATH_LASTLOG) && !defined(DISABLE_LASTLOG)
5260325f	208	lastlog = _PATH_LASTLOG;
	209
	210	/* Update lastlog unless actually recording a logout. */
	211	if (strcmp(user, "") != 0) {
a7effaac	212	int fd;
aa3378df	213	/*
	214	* It is safer to bzero the lastlog structure first because
	215	* some systems might have some extra fields in it (e.g. SGI)
	216	*/
5260325f	217	memset(&ll, 0, sizeof(ll));
	218
	219	/* Update lastlog. */
	220	ll.ll_time = time(NULL);
	221	strncpy(ll.ll_line, ttyname + 5, sizeof(ll.ll_line));
	222	strncpy(ll.ll_host, host, sizeof(ll.ll_host));
76a8e733	223	#ifdef LASTLOG_IS_DIR
	224	snprintf(buf, sizeof(buf), "%s/%s", lastlog, logname);
	225	fd = open(buf, O_RDWR);
	226	if (fd >= 0) {
	227	#else /* LASTLOG_IS_DIR */
5260325f	228	fd = open(lastlog, O_RDWR);
	229	if (fd >= 0) {
	230	lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET);
76a8e733	231	#endif /* LASTLOG_IS_DIR */
5260325f	232	if (write(fd, &ll, sizeof(ll)) != sizeof(ll))
	233	log("Could not write %.100s: %.100s", lastlog, strerror(errno));
	234	close(fd);
	235	}
8efc0c15	236	}
ae28776a	237	#endif /* defined(_PATH_LASTLOG) && !defined(DISABLE_LASTLOG) */
8efc0c15	238	}
5260325f	239
	240	/* Records that the user has logged out. */
	241
	242	void
	243	record_logout(int pid, const char *ttyname)
8efc0c15	244	{
4cca272e	245	#ifdef HAVE_LIBUTIL_LOGIN
5260325f	246	const char line = ttyname + 5; / /dev/ttyq8 -> ttyq8 */
	247	if (logout(line))
	248	logwtmp(line, "", "");
4cca272e	249	#else /* HAVE_LIBUTIL_LOGIN */
5260325f	250	record_login(pid, ttyname, "", -1, "", NULL);
4cca272e	251	#endif /* HAVE_LIBUTIL_LOGIN */
8efc0c15	252	}