1 /*
   2  * Author: Tatu Ylonen <ylo@cs.hut.fi>
   3  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
   4  *                    All rights reserved
   5  * This file performs some of the things login(1) normally does.  We cannot
   6  * easily use something like login -p -h host -f user, because there are
   7  * several different logins around, and it is hard to determined what kind of
   8  * login the current system has.  Also, we want to be able to execute commands
   9  * on a tty.
  10  *
  11  * As far as I am concerned, the code I have written for this software
  12  * can be used freely for any purpose.  Any derived versions of this
  13  * software must be clearly marked as such, and if the derived work is
  14  * incompatible with the protocol description in the RFC file, it must be
  15  * called by a name other than "ssh" or "Secure Shell".
  16  *
  17  * Copyright (c) 1999 Theo de Raadt.  All rights reserved.
  18  * Copyright (c) 1999 Markus Friedl.  All rights reserved.
  19  *
  20  * Redistribution and use in source and binary forms, with or without
  21  * modification, are permitted provided that the following conditions
  22  * are met:
  23  * 1. Redistributions of source code must retain the above copyright
  24  *    notice, this list of conditions and the following disclaimer.
  25  * 2. Redistributions in binary form must reproduce the above copyright
  26  *    notice, this list of conditions and the following disclaimer in the
  27  *    documentation and/or other materials provided with the distribution.
  28  *
  29  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  30  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  31  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  32  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  33  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  34  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  35  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  36  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  37  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  38  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  39  */
  40 /*
  41  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  42  * Use is subject to license terms.
  43  */
  44 
  45 #include "includes.h"
  46 RCSID("$OpenBSD: sshlogin.c,v 1.5 2002/08/29 15:57:25 stevesk Exp $");
  47 
  48 #include "loginrec.h"
  49 #include "log.h"
  50 #include "buffer.h"
  51 #include "servconf.h"
  52 #include "canohost.h"
  53 #include "packet.h"
  54 
  55 extern u_int utmp_len;
  56 extern ServerOptions options;
  57 
  58 /*
  59  * Returns the time when the user last logged in.  Returns 0 if the
  60  * information is not available.  This must be called before record_login.
  61  * The host the user logged in from will be returned in buf.
  62  */
  63 u_long
  64 get_last_login_time(uid_t uid, const char *logname,
  65     char *buf, u_int bufsize)
  66 {
  67   struct logininfo li;
  68 
  69   (void) login_get_lastlog(&li, uid);
  70   (void) strlcpy(buf, li.hostname, bufsize);
  71   return li.tv_sec;
  72 }
  73 
  74 /*
  75  * Records that the user has logged in.  If only these parts of operating
  76  * systems were more standardized.
  77  */
  78 void
  79 record_login(pid_t pid, const char *ttyname, const char *progname,
  80                 const char *user)
  81 {
  82   struct logininfo *li;
  83   static int initialized = 0;
  84   static socklen_t fromlen;
  85   static struct sockaddr_storage from;
  86   static const char *remote_name_or_ip;
  87 
  88   if (pid == 0)
  89     pid = getpid();
  90   /*
  91    * Get IP address of client. If the connection is not a socket, let
  92    * the address be 0.0.0.0.
  93    */
  94   if (!initialized) {
  95     (void) memset(&from, 0, sizeof(from));
  96     if (packet_connection_is_on_socket()) {
  97       fromlen = sizeof(from);
  98       if (getpeername(packet_get_connection_in(),
  99           (struct sockaddr *) &from, &fromlen) < 0) {
 100         debug("getpeername: %.100s", strerror(errno));
 101         fatal_cleanup();
 102       }
 103     }
 104     remote_name_or_ip = get_remote_name_or_ip(utmp_len,
 105       options.verify_reverse_mapping);
 106 
 107     initialized = 1;
 108   }
 109 
 110   li = login_alloc_entry(pid, user, remote_name_or_ip, ttyname, progname);
 111   login_set_addr(li, (struct sockaddr*) &from, sizeof(struct sockaddr));
 112   (void) login_login(li);
 113   login_free_entry(li);
 114 }
 115 
 116 /* Records that the user has logged out. */
 117 void
 118 record_logout(pid_t pid, const char *ttyname, const char *progname,
 119                 const char *user)
 120 {
 121   struct logininfo *li;
 122 
 123   li = login_alloc_entry(pid, user, NULL, ttyname, progname);
 124   (void) login_logout(li);
 125   login_free_entry(li);
 126 }