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Damien Millerd4a8b7e1999-10-27 13:42:43 +10001/*
Damien Miller95def091999-11-25 00:26:21 +11002 * Author: Tatu Ylonen <ylo@cs.hut.fi>
Damien Miller95def091999-11-25 00:26:21 +11003 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11005 * 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.
Damien Miller4af51302000-04-16 11:18:38 +100010 *
Damien Millere4340be2000-09-16 13:29:08 +110011 * 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.
Damien Miller95def091999-11-25 00:26:21 +110039 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100040
41#include "includes.h"
Darren Tuckerbcf27972004-08-13 21:21:47 +100042RCSID("$OpenBSD: sshlogin.c,v 1.13 2004/08/12 09:18:24 djm Exp $");
Damien Millerd4a8b7e1999-10-27 13:42:43 +100043
andre2ff7b5d2000-06-03 14:57:40 +000044#include "loginrec.h"
Darren Tucker09991742004-07-17 17:05:14 +100045#include "log.h"
46#include "buffer.h"
47#include "servconf.h"
48
49extern Buffer loginmsg;
50extern ServerOptions options;
Damien Miller2f6a0ad2000-05-31 11:20:11 +100051
Damien Miller5428f641999-11-25 11:54:57 +110052/*
53 * Returns the time when the user last logged in. Returns 0 if the
54 * information is not available. This must be called before record_login.
55 * The host the user logged in from will be returned in buf.
56 */
Ben Lindstrom46c16222000-12-22 01:43:59 +000057u_long
Damien Miller95def091999-11-25 00:26:21 +110058get_last_login_time(uid_t uid, const char *logname,
Ben Lindstrom5c385522002-06-23 21:23:20 +000059 char *buf, u_int bufsize)
Damien Millerd4a8b7e1999-10-27 13:42:43 +100060{
Ben Lindstrom78ffe262004-02-27 03:01:19 +000061 struct logininfo li;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100062
Ben Lindstrom78ffe262004-02-27 03:01:19 +000063 login_get_lastlog(&li, uid);
64 strlcpy(buf, li.hostname, bufsize);
65 return li.tv_sec;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100066}
67
Damien Miller5428f641999-11-25 11:54:57 +110068/*
Darren Tucker09991742004-07-17 17:05:14 +100069 * Generate and store last login message. This must be done before
70 * login_login() is called and lastlog is updated.
71 */
Darren Tucker133b7572004-08-12 22:50:03 +100072static void
Darren Tucker09991742004-07-17 17:05:14 +100073store_lastlog_message(const char *user, uid_t uid)
74{
75 char *time_string, hostname[MAXHOSTNAMELEN] = "", buf[512];
76 time_t last_login_time;
77
78#ifndef NO_SSH_LASTLOG
79 if (!options.print_lastlog)
80 return;
81
82 last_login_time = get_last_login_time(uid, user, hostname,
83 sizeof(hostname));
84
85 if (last_login_time != 0) {
86 time_string = ctime(&last_login_time);
87 if (strchr(time_string, '\n'))
88 *strchr(time_string, '\n') = '\0';
89 if (strcmp(hostname, "") == 0)
90 snprintf(buf, sizeof(buf), "Last login: %s\r\n",
91 time_string);
92 else
93 snprintf(buf, sizeof(buf), "Last login: %s from %s\r\n",
94 time_string, hostname);
95 buffer_append(&loginmsg, buf, strlen(buf));
96 }
97#endif /* NO_SSH_LASTLOG */
98}
99
100/*
Damien Miller469954d2003-06-18 20:25:33 +1000101 * Records that the user has logged in. I wish these parts of operating
102 * systems were more standardized.
Damien Miller5428f641999-11-25 11:54:57 +1100103 */
Damien Miller4af51302000-04-16 11:18:38 +1000104void
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000105record_login(pid_t pid, const char *tty, const char *user, uid_t uid,
Damien Millerebc23062002-09-04 16:45:09 +1000106 const char *host, struct sockaddr * addr, socklen_t addrlen)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000107{
Ben Lindstrom78ffe262004-02-27 03:01:19 +0000108 struct logininfo *li;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000109
Darren Tucker09991742004-07-17 17:05:14 +1000110 /* save previous login details before writing new */
111 store_lastlog_message(user, uid);
112
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000113 li = login_alloc_entry(pid, user, host, tty);
Ben Lindstrom78ffe262004-02-27 03:01:19 +0000114 login_set_addr(li, addr, addrlen);
115 login_login(li);
116 login_free_entry(li);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000117}
Damien Miller95def091999-11-25 00:26:21 +1100118
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000119#ifdef LOGIN_NEEDS_UTMPX
120void
121record_utmp_only(pid_t pid, const char *ttyname, const char *user,
Kevin Steves678ee512003-01-01 23:43:55 +0000122 const char *host, struct sockaddr * addr, socklen_t addrlen)
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000123{
Ben Lindstrom78ffe262004-02-27 03:01:19 +0000124 struct logininfo *li;
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000125
Ben Lindstrom78ffe262004-02-27 03:01:19 +0000126 li = login_alloc_entry(pid, user, host, ttyname);
127 login_set_addr(li, addr, addrlen);
128 login_utmp_only(li);
129 login_free_entry(li);
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000130}
131#endif
132
Damien Miller95def091999-11-25 00:26:21 +1100133/* Records that the user has logged out. */
Damien Miller4af51302000-04-16 11:18:38 +1000134void
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000135record_logout(pid_t pid, const char *tty, const char *user)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000136{
Ben Lindstrom78ffe262004-02-27 03:01:19 +0000137 struct logininfo *li;
andre2ff7b5d2000-06-03 14:57:40 +0000138
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000139 li = login_alloc_entry(pid, user, NULL, tty);
Ben Lindstrom78ffe262004-02-27 03:01:19 +0000140 login_logout(li);
141 login_free_entry(li);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000142}