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openssh-portable/login.c

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/*
*
* 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 1.20 2000/01/26 00:04:48 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(_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) */
/* 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 * 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)
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);
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)
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)
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 */
}
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