blob: 2688d8d7b3902f2b1d9d3824093feec827459916 [file] [log] [blame]
Damien Millera256c8d2011-01-11 17:20:05 +11001/* $OpenBSD: sshlogin.c,v 1.27 2011/01/11 06:06:09 djm Exp $ */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002/*
Damien Miller95def091999-11-25 00:26:21 +11003 * Author: Tatu Ylonen <ylo@cs.hut.fi>
Damien Miller95def091999-11-25 00:26:21 +11004 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11006 * This file performs some of the things login(1) normally does. We cannot
7 * easily use something like login -p -h host -f user, because there are
8 * several different logins around, and it is hard to determined what kind of
9 * login the current system has. Also, we want to be able to execute commands
10 * on a tty.
Damien Miller4af51302000-04-16 11:18:38 +100011 *
Damien Millere4340be2000-09-16 13:29:08 +110012 * As far as I am concerned, the code I have written for this software
13 * can be used freely for any purpose. Any derived versions of this
14 * software must be clearly marked as such, and if the derived work is
15 * incompatible with the protocol description in the RFC file, it must be
16 * called by a name other than "ssh" or "Secure Shell".
17 *
18 * Copyright (c) 1999 Theo de Raadt. All rights reserved.
19 * Copyright (c) 1999 Markus Friedl. All rights reserved.
20 *
21 * Redistribution and use in source and binary forms, with or without
22 * modification, are permitted provided that the following conditions
23 * are met:
24 * 1. Redistributions of source code must retain the above copyright
25 * notice, this list of conditions and the following disclaimer.
26 * 2. Redistributions in binary form must reproduce the above copyright
27 * notice, this list of conditions and the following disclaimer in the
28 * documentation and/or other materials provided with the distribution.
29 *
30 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
31 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
32 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
33 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
34 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
35 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
39 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Damien Miller95def091999-11-25 00:26:21 +110040 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100041
42#include "includes.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100043
Damien Millere6b3b612006-07-24 14:01:23 +100044#include <sys/types.h>
Damien Miller8dbffe72006-08-05 11:02:17 +100045#include <sys/param.h>
Damien Millerd7834352006-08-05 12:39:39 +100046#include <sys/socket.h>
Damien Millere6b3b612006-07-24 14:01:23 +100047
Damien Miller36cbe412006-08-05 12:54:24 +100048#include <netinet/in.h>
49
Darren Tucker39972492006-07-12 22:22:46 +100050#include <errno.h>
Damien Miller57cf6382006-07-10 21:13:46 +100051#include <fcntl.h>
Damien Millerd7834352006-08-05 12:39:39 +100052#include <stdarg.h>
Damien Millera7a73ee2006-08-05 11:37:59 +100053#include <stdio.h>
Damien Millere3476ed2006-07-24 14:13:33 +100054#include <string.h>
Damien Miller5598b4f2006-07-24 14:09:40 +100055#include <time.h>
Damien Millere6b3b612006-07-24 14:01:23 +100056#include <unistd.h>
Damien Miller57cf6382006-07-10 21:13:46 +100057
andre2ff7b5d2000-06-03 14:57:40 +000058#include "loginrec.h"
Darren Tucker09991742004-07-17 17:05:14 +100059#include "log.h"
60#include "buffer.h"
61#include "servconf.h"
62
63extern Buffer loginmsg;
64extern ServerOptions options;
Damien Miller2f6a0ad2000-05-31 11:20:11 +100065
Damien Miller5428f641999-11-25 11:54:57 +110066/*
67 * Returns the time when the user last logged in. Returns 0 if the
68 * information is not available. This must be called before record_login.
69 * The host the user logged in from will be returned in buf.
70 */
Damien Millera1690d02006-03-26 14:27:35 +110071time_t
Damien Miller95def091999-11-25 00:26:21 +110072get_last_login_time(uid_t uid, const char *logname,
Damien Millera1690d02006-03-26 14:27:35 +110073 char *buf, size_t bufsize)
Damien Millerd4a8b7e1999-10-27 13:42:43 +100074{
Ben Lindstrom78ffe262004-02-27 03:01:19 +000075 struct logininfo li;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100076
Ben Lindstrom78ffe262004-02-27 03:01:19 +000077 login_get_lastlog(&li, uid);
78 strlcpy(buf, li.hostname, bufsize);
Damien Millera1690d02006-03-26 14:27:35 +110079 return (time_t)li.tv_sec;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100080}
81
Damien Miller5428f641999-11-25 11:54:57 +110082/*
Darren Tucker09991742004-07-17 17:05:14 +100083 * Generate and store last login message. This must be done before
84 * login_login() is called and lastlog is updated.
85 */
Darren Tucker133b7572004-08-12 22:50:03 +100086static void
Darren Tucker09991742004-07-17 17:05:14 +100087store_lastlog_message(const char *user, uid_t uid)
88{
Darren Tuckera422d972009-05-04 12:52:47 +100089#ifndef NO_SSH_LASTLOG
Darren Tucker09991742004-07-17 17:05:14 +100090 char *time_string, hostname[MAXHOSTNAMELEN] = "", buf[512];
91 time_t last_login_time;
92
Darren Tucker09991742004-07-17 17:05:14 +100093 if (!options.print_lastlog)
94 return;
95
Darren Tuckerb5d5ee12009-08-17 09:40:00 +100096# ifdef CUSTOM_SYS_AUTH_GET_LASTLOGIN_MSG
97 time_string = sys_auth_get_lastlogin_msg(user, uid);
98 if (time_string != NULL) {
99 buffer_append(&loginmsg, time_string, strlen(time_string));
Darren Tuckerf60845f2013-06-02 08:07:31 +1000100 free(time_string);
Darren Tuckerb5d5ee12009-08-17 09:40:00 +1000101 }
102# else
Darren Tucker09991742004-07-17 17:05:14 +1000103 last_login_time = get_last_login_time(uid, user, hostname,
104 sizeof(hostname));
105
106 if (last_login_time != 0) {
107 time_string = ctime(&last_login_time);
Damien Miller14b017d2007-09-17 16:09:15 +1000108 time_string[strcspn(time_string, "\n")] = '\0';
Darren Tucker09991742004-07-17 17:05:14 +1000109 if (strcmp(hostname, "") == 0)
110 snprintf(buf, sizeof(buf), "Last login: %s\r\n",
111 time_string);
112 else
113 snprintf(buf, sizeof(buf), "Last login: %s from %s\r\n",
114 time_string, hostname);
115 buffer_append(&loginmsg, buf, strlen(buf));
116 }
Darren Tuckerb5d5ee12009-08-17 09:40:00 +1000117# endif /* CUSTOM_SYS_AUTH_GET_LASTLOGIN_MSG */
Darren Tucker09991742004-07-17 17:05:14 +1000118#endif /* NO_SSH_LASTLOG */
119}
120
121/*
Damien Miller469954d2003-06-18 20:25:33 +1000122 * Records that the user has logged in. I wish these parts of operating
123 * systems were more standardized.
Damien Miller5428f641999-11-25 11:54:57 +1100124 */
Damien Miller4af51302000-04-16 11:18:38 +1000125void
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000126record_login(pid_t pid, const char *tty, const char *user, uid_t uid,
Damien Miller90967402006-03-26 14:07:26 +1100127 const char *host, struct sockaddr *addr, socklen_t addrlen)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000128{
Ben Lindstrom78ffe262004-02-27 03:01:19 +0000129 struct logininfo *li;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000130
Darren Tucker09991742004-07-17 17:05:14 +1000131 /* save previous login details before writing new */
132 store_lastlog_message(user, uid);
133
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000134 li = login_alloc_entry(pid, user, host, tty);
Ben Lindstrom78ffe262004-02-27 03:01:19 +0000135 login_set_addr(li, addr, addrlen);
136 login_login(li);
137 login_free_entry(li);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000138}
Damien Miller95def091999-11-25 00:26:21 +1100139
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000140#ifdef LOGIN_NEEDS_UTMPX
141void
142record_utmp_only(pid_t pid, const char *ttyname, const char *user,
Damien Millere3b60b52006-07-10 21:08:03 +1000143 const char *host, struct sockaddr *addr, socklen_t addrlen)
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000144{
Ben Lindstrom78ffe262004-02-27 03:01:19 +0000145 struct logininfo *li;
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000146
Ben Lindstrom78ffe262004-02-27 03:01:19 +0000147 li = login_alloc_entry(pid, user, host, ttyname);
148 login_set_addr(li, addr, addrlen);
149 login_utmp_only(li);
150 login_free_entry(li);
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000151}
152#endif
153
Damien Miller95def091999-11-25 00:26:21 +1100154/* Records that the user has logged out. */
Damien Miller4af51302000-04-16 11:18:38 +1000155void
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000156record_logout(pid_t pid, const char *tty, const char *user)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000157{
Ben Lindstrom78ffe262004-02-27 03:01:19 +0000158 struct logininfo *li;
andre2ff7b5d2000-06-03 14:57:40 +0000159
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000160 li = login_alloc_entry(pid, user, NULL, tty);
Ben Lindstrom78ffe262004-02-27 03:01:19 +0000161 login_logout(li);
162 login_free_entry(li);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000163}