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i bet a lot of people didn't know what ssh 1.2.16 had a nice license.
well, except for the patent issues.  someone in sweden (forget their
name at the moment) cleaned out most of the patented code, and now
this code removes rsa code.  when this is done, it will link against
libssl, but the work isn't completely done yet.  then we need to bring
this up to modern days, featurewise.

/*

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 1.1 1999/09/26 20:53:36 deraadt Exp $");

#ifdef HAVE_UTMP_H
#include <utmp.h>
#ifdef HAVE_LASTLOG_H
#include <lastlog.h> /* Some have the definitions in utmp.h. */
#endif /* HAVE_LASTLOG_H */
#endif /* HAVE_UTMP_H */
#ifdef HAVE_UTMPX_H
#include <utmpx.h>
#endif /* HAVE_UTMPX_H */
#ifdef HAVE_USERSEC_H
#include <usersec.h>
#endif /* HAVE_USERSEC_H */
#include "ssh.h"

/* 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. */

#ifdef LASTLOG_IS_DIR
unsigned long get_last_login_time(uid_t uid, const char *name, 
				  char *buf, unsigned int bufsize)
{
#if defined(HAVE_LASTLOG_H) || defined(HAVE_LASTLOG)
  struct lastlog ll;
  char lastlogfile[500];
  int fd;

#ifdef _PATH_LASTLOG
  sprintf(lastlogfile, "%.200s/%.200s", _PATH_LASTLOG, name);
#else
#ifdef LASTLOG_FILE
  sprintf(lastlogfile, "%.200s/%.200s", LASTLOG_FILE, name);
#else
  sprintf(lastlogfile, "%.200s/%.200s", SSH_LASTLOG, name);
#endif
#endif

  strcpy(buf, "");

  fd = open(lastlogfile, O_RDONLY);
  if (fd < 0)
    return 0;
  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 /* HAVE_LASTLOG_H || HAVE_LASTLOG */

  return 0;

#endif /* HAVE_LASTLOG_H || HAVE_LASTLOG */
}

#else /* LASTLOG_IS_DIR */

/* 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(HAVE_LASTLOG_H) || defined(HAVE_LASTLOG)

  struct lastlog ll;
  char *lastlog;
  int fd;

#ifdef _PATH_LASTLOG
  lastlog = _PATH_LASTLOG;
#else
#ifdef LASTLOG_FILE
  lastlog = LASTLOG_FILE;
#else
  lastlog = SSH_LASTLOG;
#endif
#endif

  strcpy(buf, "");

  fd = open(lastlog, O_RDONLY);
  if (fd < 0)
    return 0;
  lseek(fd, (off_t)((long)uid * sizeof(ll)), 0);
  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 /* HAVE_LASTLOG_H || HAVE_LASTLOG */

#ifdef HAVE_USERSEC_H

  char *lasthost;
  int lasttime;
  if (setuserdb(S_READ) < 0)
    return 0;
  if (getuserattr((char *)logname, S_LASTTIME, &lasttime, SEC_INT) < 0)
    {
      enduserdb();
      return 0;
    }
  if (getuserattr((char *)logname, S_LASTHOST, &lasthost, SEC_CHAR) < 0)
    {
      enduserdb();
      return 0;
    }
  strncpy(buf, lasthost, bufsize);
  buf[bufsize - 1] = 0;
  if (enduserdb() < 0)
    return 0;
  return lasttime;

#else /* HAVE_USERSEC_H */
  
  return 0;

#endif /* HAVE_USERSEC_H */

#endif /* HAVE_LASTLOG_H || HAVE_LASTLOG */
}
#endif /* LASTLOG_IS_DIR */

/* 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)
{
  int fd;

#if defined(HAVE_LASTLOG_H) || defined(HAVE_LASTLOG)
  struct lastlog ll;
  char *lastlog;
#ifdef LASTLOG_IS_DIR
  char lastlogfile[100];
#endif /* LASTLOG_IS_DIR */
#endif /* HAVE_LASTLOG_H || HAVE_LASTLOG */

#if defined(HAVE_UTMP_H) && !defined(HAVE_UTMPX_H)
  struct utmp u, u2;
  off_t offset;
  const char *utmp, *wtmp;

  /* Construct an utmp/wtmp entry. */
  memset(&u, 0, sizeof(u));
#ifdef DEAD_PROCESS
  if (strcmp(user, "") == 0)
    u.ut_type = DEAD_PROCESS; /* logout */
  else
    u.ut_type = USER_PROCESS;
#endif /* LOGIN_PROCESS */
#ifdef HAVE_PID_IN_UTMP
  u.ut_pid = pid;
#endif /* PID_IN_UTMP */
#ifdef HAVE_ID_IN_UTMP
#ifdef __sgi
    strncpy(u.ut_id, ttyname + 8, sizeof(u.ut_id)); /* /dev/ttyq99 -> q99 */
#else /* __sgi */
    if (sizeof(u.ut_id) > 4)
      strncpy(u.ut_id, ttyname + 5, sizeof(u.ut_id));
    else
      strncpy(u.ut_id, ttyname + strlen(ttyname) - 2, sizeof(u.ut_id));
#endif /* __sgi */
#endif /* HAVE_ID_IN_UTMP */
  strncpy(u.ut_line, ttyname + 5, sizeof(u.ut_line));
  u.ut_time = time(NULL);
#ifdef HAVE_NAME_IN_UTMP
  strncpy(u.ut_name, user, sizeof(u.ut_name));
#else /* HAVE_NAME_IN_UTMP */
  strncpy(u.ut_user, user, sizeof(u.ut_user));
#endif /* HAVE_NAME_IN_UTMP */
#ifdef HAVE_HOST_IN_UTMP
  strncpy(u.ut_host, host, sizeof(u.ut_host));
#endif /* HAVE_HOST_IN_UTMP */
#ifdef HAVE_ADDR_IN_UTMP
  if (addr)
    memcpy(&u.ut_addr, &addr->sin_addr, sizeof(u.ut_addr));
  else
    memset(&u.ut_addr, 0, sizeof(u.ut_addr));
#endif

  /* Figure out the file names. */
#ifdef _PATH_UTMP
  utmp = _PATH_UTMP;
  wtmp = _PATH_WTMP;
#else
#ifdef UTMP_FILE
  utmp = UTMP_FILE;
  wtmp = WTMP_FILE;
#else
  utmp = SSH_UTMP;
  wtmp = SSH_WTMP;
#endif
#endif
  
#ifdef HAVE_LIBUTIL_LOGIN
  login(&u);
#else /* HAVE_LIBUTIL_LOGIN */
  /* Append an entry to wtmp. */
  fd = open(wtmp, O_WRONLY|O_APPEND);
  if (fd >= 0)
    {
      if (write(fd, &u, sizeof(u)) != sizeof(u))
	log("Could not write %.100s: %.100s", wtmp, strerror(errno));
      close(fd);
    }

  /* Replace the proper entry in utmp, as identified by ut_line.  Append a
     new entry if the line could not be found. */
  fd = open(utmp, O_RDWR);
  if (fd >= 0)
    {
      while (1)
	{
	  offset = lseek(fd, (off_t)0L, 1);
	  if (read(fd, &u2, sizeof(u2)) != sizeof(u2))
	    {
	      lseek(fd, offset, 0);
	      if (write(fd, &u, sizeof(u)) != sizeof(u))
		log("Could not append to %.100s: %.100s", 
		    utmp, strerror(errno));
	      break;
	    }
	  if (strncmp(u2.ut_line, ttyname + 5, sizeof(u2.ut_line)) == 0)
	    {
	      lseek(fd, offset, 0);
	      if (write(fd, &u, sizeof(u)) != sizeof(u))
		log("Could not write to %.100s: %.100s", 
		    utmp, strerror(errno));
	      break;
	    }
	}
      close(fd);
    }
#endif /* HAVE_LIBUTIL_LOGIN */
#endif /* HAVE_UTMP_H && !HAVE_UTMPX_H */

#ifdef HAVE_UTMPX_H
  {
    struct utmpx ux, *uxp;
    memset(&ux, 0, sizeof(ux));
    strncpy(ux.ut_line, ttyname + 5, sizeof(ux.ut_line));
    uxp = getutxline(&ux);
    if (uxp)
      ux = *uxp;
    strncpy(ux.ut_user, user, sizeof(ux.ut_user));
#ifdef __sgi
    strncpy(ux.ut_id, ttyname + 8, sizeof(ux.ut_id)); /* /dev/ttyq99 -> q99 */
#else /* __sgi */
    if (sizeof(ux.ut_id) > 4)
      strncpy(ux.ut_id, ttyname + 5, sizeof(ux.ut_id));
    else
      strncpy(ux.ut_id, ttyname + strlen(ttyname) - 2, sizeof(ux.ut_id));
#endif /* __sgi */
    ux.ut_pid = pid;
    if (strcmp(user, "") == 0)
      ux.ut_type = DEAD_PROCESS;
    else
      ux.ut_type = USER_PROCESS;
    gettimeofday(&ux.ut_tv, NULL);
#if HAVE_UT_SESSION
    ux.ut_session = pid;
#endif
    strncpy(ux.ut_host, host, sizeof(ux.ut_host));
    ux.ut_host[sizeof(ux.ut_host) - 1] = 0;
#ifdef HAVE_UT_SYSLEN
    ux.ut_syslen = strlen(ux.ut_host);
#endif
    pututxline(&ux);
#ifdef WTMPX_FILE
    updwtmpx(WTMPX_FILE, &ux);
#endif
    endutxent();
  }
#endif /* HAVE_UTMPX_H */

#if defined(HAVE_LASTLOG_H) || defined(HAVE_LASTLOG)

#ifdef _PATH_LASTLOG
  lastlog = _PATH_LASTLOG;
#else
#ifdef LASTLOG_FILE
  lastlog = LASTLOG_FILE;
#else
  lastlog = SSH_LASTLOG;
#endif
#endif

  /* Update lastlog unless actually recording a logout. */
  if (strcmp(user, "") != 0)
    {
      /* 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
      sprintf(lastlogfile, "%.100s/%.100s", lastlog, user);
      fd = open(lastlogfile, O_WRONLY | O_CREAT, 0644);
      if (fd >= 0)
	{
	  if (write(fd, &ll, sizeof(ll)) != sizeof(ll))
	    log("Could not write %.100s: %.100s", 
		lastlogfile, strerror(errno));
	  close(fd);
	} 
      else 
	{
	  log("Could not open %.100s: %.100s", lastlogfile, strerror(errno));
	}
#else /* LASTLOG_IS_DIR */
      fd = open(lastlog, O_RDWR);
      if (fd >= 0)
	{
	  lseek(fd, (off_t)((long)uid * sizeof(ll)), 0);
	  if (write(fd, &ll, sizeof(ll)) != sizeof(ll))
	    log("Could not write %.100s: %.100s", lastlog, strerror(errno));
	  close(fd);
	}
#endif /* LASTLOG_IS_DIR */
    }
#endif /* HAVE_LASTLOG_H || HAVE_LASTLOG */

#ifdef HAVE_USERSEC_H

  if (strcmp(user, "") != 0)
    {
      int lasttime = time(NULL);
      if (setuserdb(S_WRITE) < 0)
	log("setuserdb S_WRITE failed: %.100s", strerror(errno));
      if (putuserattr((char *)user, S_LASTTIME, (void *)lasttime, SEC_INT) < 0)
	log("putuserattr S_LASTTIME failed: %.100s", strerror(errno));
      if (putuserattr((char *)user, S_LASTTTY, (void *)(ttyname + 5), 
		      SEC_CHAR) < 0)
	log("putuserattr S_LASTTTY %.900s failed: %.100s", 
	    ttyname, strerror(errno));
      if (putuserattr((char *)user, S_LASTHOST, (void *)host, SEC_CHAR) < 0)
	log("putuserattr S_LASTHOST %.900s failed: %.100s", 
	    host, strerror(errno));
      if (putuserattr((char *)user, 0, NULL, SEC_COMMIT) < 0)
	log("putuserattr SEC_COMMIT failed: %.100s", strerror(errno));
      if (enduserdb() < 0)
	log("enduserdb failed: %.100s", strerror(errno));
    }
#endif   
}
  
/* 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 */  
}