login.c - third_party/openssh-portable - Git at Google

 /*
  *
  * 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: login.c,v 1.28 2000/05/30 03:12:46 damien Exp $");

 #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(WITH_AIXAUTHENTICATE)
 	/* This is done in do_authentication */
 	return (unsigned long) 0;
 #else
 #if defined(_PATH_LASTLOG) && !defined(DISABLE_LASTLOG)
 	struct lastlog ll;
 	char *lastlog;
 	int fd;
 #ifdef LASTLOG_IS_DIR
 	char lbuf[1024];
 #endif /* LASTLOG_IS_DIR */

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

 #ifndef 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(lbuf, sizeof(buf), "%s/%s", lastlog, logname);
 	fd = open(lbuf, 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) */
 # ifdef HAVE_TYPE_IN_UTMP
 	/* 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;
 # else
 	return 0;
 # endif /* HAVE_TYPE_IN_UTMP */
 #endif /* defined(_PATH_LASTLOG) && !defined(DISABLE_LASTLOG) */
 #endif /* defined(WITH_AIXAUTHENTICATE) */
 }

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

 void
 record_login(pid_t pid, const char *ttyname, const char *user, uid_t uid,
 	     const char *host, struct sockaddr * 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)
 #ifdef _AIX
 	strncpy(u.ut_id, ttyname + 5, sizeof(u.ut_id));
 #else /* !AIX */
 	strncpy(u.ut_id, ttyname + 8, sizeof(u.ut_id));
 #endif
 #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)
 	if (addr) {
 		switch (addr->sa_family) {
 			case AF_INET: {
 				struct sockaddr_in *in = (struct sockaddr_in*)addr;
 				memcpy(&(u.ut_addr), &(in->sin_addr), sizeof(&(in->sin_addr)));
 				break;
 			}
 #if defined(HAVE_ADDR_V6_IN_UTMP)
 			case AF_INET6: {
 				struct sockaddr_in6 *in6 = (struct sockaddr_in6*)addr;
 				memcpy(u.ut_addr_v6, &(in6->sin6_addr), sizeof(&(in6->sin6_addr)));
 				break;
 			}
 #endif
 			default:
 				break;
 		}
 	}
 #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);
 	if (utx.ut_syslen + 1 > sizeof(utx.ut_host))
 		utx.ut_syslen = sizeof(utx.ut_host);
 	strncpy(utx.ut_host, host, utx.ut_syslen);
 #  else
 	strncpy(utx.ut_host, host, sizeof(utx.ut_host));
 #  endif /* HAVE_SYSLEN_IN_UTMPX */
 	utx.ut_host[sizeof(utx.ut_host)-1] = '\0';
 # endif
 #if defined(HAVE_ADDR_IN_UTMPX)
 	if (addr) {
 		switch (addr->sa_family) {
 			case AF_INET: {
 				struct sockaddr_in *in = (struct sockaddr_in*)addr;
 				memcpy(&(utx.ut_addr), &(in->sin_addr), sizeof(&(in->sin_addr)));
 				break;
 			}
 #if defined(HAVE_ADDR_V6_IN_UTMPX)
 			case AF_INET6: {
 				struct sockaddr_in6 *in6 = (struct sockaddr_in6*)addr;
 				memcpy(utx.ut_addr_v6, &(in6->sin6_addr), sizeof(&(in6->sin6_addr)));
 				break;
 			}
 #endif
 			default:
 				break;
 		}
 	}
 #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) && !defined(WITH_AIXAUTHENTICATE)
 	/* AIX does this in do_authentication */
 	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, user);
 		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) && !defined(WITH_AIXAUTHENTICATE) */
 }

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

 void
 record_logout(pid_t 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 */
 }
	/*
	*
	* 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: login.c,v 1.28 2000/05/30 03:12:46 damien Exp $");

	#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(WITH_AIXAUTHENTICATE)
	/* This is done in do_authentication */
	return (unsigned long) 0;
	#else
	#if defined(_PATH_LASTLOG) && !defined(DISABLE_LASTLOG)
	struct lastlog ll;
	char *lastlog;
	int fd;
	#ifdef LASTLOG_IS_DIR
	char lbuf[1024];
	#endif /* LASTLOG_IS_DIR */

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

	#ifndef 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(lbuf, sizeof(buf), "%s/%s", lastlog, logname);
	fd = open(lbuf, 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) */
	# ifdef HAVE_TYPE_IN_UTMP
	/* 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;
	# else
	return 0;
	# endif /* HAVE_TYPE_IN_UTMP */
	#endif /* defined(_PATH_LASTLOG) && !defined(DISABLE_LASTLOG) */
	#endif /* defined(WITH_AIXAUTHENTICATE) */
	}

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

	void
	record_login(pid_t pid, const char ttyname, const char user, uid_t uid,
	const char host, struct sockaddr 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)
	#ifdef _AIX
	strncpy(u.ut_id, ttyname + 5, sizeof(u.ut_id));
	#else /* !AIX */
	strncpy(u.ut_id, ttyname + 8, sizeof(u.ut_id));
	#endif
	#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)
	if (addr) {
	switch (addr->sa_family) {
	case AF_INET: {
	struct sockaddr_in in = (struct sockaddr_in)addr;
	memcpy(&(u.ut_addr), &(in->sin_addr), sizeof(&(in->sin_addr)));
	break;
	}
	#if defined(HAVE_ADDR_V6_IN_UTMP)
	case AF_INET6: {
	struct sockaddr_in6 in6 = (struct sockaddr_in6)addr;
	memcpy(u.ut_addr_v6, &(in6->sin6_addr), sizeof(&(in6->sin6_addr)));
	break;
	}
	#endif
	default:
	break;
	}
	}
	#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);
	if (utx.ut_syslen + 1 > sizeof(utx.ut_host))
	utx.ut_syslen = sizeof(utx.ut_host);
	strncpy(utx.ut_host, host, utx.ut_syslen);
	# else
	strncpy(utx.ut_host, host, sizeof(utx.ut_host));
	# endif /* HAVE_SYSLEN_IN_UTMPX */
	utx.ut_host[sizeof(utx.ut_host)-1] = '\0';
	# endif
	#if defined(HAVE_ADDR_IN_UTMPX)
	if (addr) {
	switch (addr->sa_family) {
	case AF_INET: {
	struct sockaddr_in in = (struct sockaddr_in)addr;
	memcpy(&(utx.ut_addr), &(in->sin_addr), sizeof(&(in->sin_addr)));
	break;
	}
	#if defined(HAVE_ADDR_V6_IN_UTMPX)
	case AF_INET6: {
	struct sockaddr_in6 in6 = (struct sockaddr_in6)addr;
	memcpy(utx.ut_addr_v6, &(in6->sin6_addr), sizeof(&(in6->sin6_addr)));
	break;
	}
	#endif
	default:
	break;
	}
	}
	#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) && !defined(WITH_AIXAUTHENTICATE)
	/* AIX does this in do_authentication */
	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, user);
	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) && !defined(WITH_AIXAUTHENTICATE) */
	}

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

	void
	record_logout(pid_t 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 */
	}