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deraadt@openbsd.org087266e2015-01-20 23:14:00 +00001/* $OpenBSD: sshlogin.c,v 1.31 2015/01/20 23:14:00 deraadt 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 Millerd7834352006-08-05 12:39:39 +100045#include <sys/socket.h>
Damien Millere6b3b612006-07-24 14:01:23 +100046
Damien Miller36cbe412006-08-05 12:54:24 +100047#include <netinet/in.h>
48
Darren Tucker39972492006-07-12 22:22:46 +100049#include <errno.h>
Damien Miller57cf6382006-07-10 21:13:46 +100050#include <fcntl.h>
Damien Millerd7834352006-08-05 12:39:39 +100051#include <stdarg.h>
Damien Millera7a73ee2006-08-05 11:37:59 +100052#include <stdio.h>
Damien Millere3476ed2006-07-24 14:13:33 +100053#include <string.h>
Damien Miller5598b4f2006-07-24 14:09:40 +100054#include <time.h>
Damien Millere6b3b612006-07-24 14:01:23 +100055#include <unistd.h>
deraadt@openbsd.org087266e2015-01-20 23:14:00 +000056#include <limits.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"
Damien Miller7acefbb2014-07-18 14:11:24 +100061#include "misc.h"
Darren Tucker09991742004-07-17 17:05:14 +100062#include "servconf.h"
63
64extern Buffer loginmsg;
65extern ServerOptions options;
Damien Miller2f6a0ad2000-05-31 11:20:11 +100066
Damien Miller5428f641999-11-25 11:54:57 +110067/*
68 * Returns the time when the user last logged in. Returns 0 if the
69 * information is not available. This must be called before record_login.
70 * The host the user logged in from will be returned in buf.
71 */
Damien Millera1690d02006-03-26 14:27:35 +110072time_t
Damien Miller95def091999-11-25 00:26:21 +110073get_last_login_time(uid_t uid, const char *logname,
Damien Millera1690d02006-03-26 14:27:35 +110074 char *buf, size_t bufsize)
Damien Millerd4a8b7e1999-10-27 13:42:43 +100075{
Ben Lindstrom78ffe262004-02-27 03:01:19 +000076 struct logininfo li;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100077
Ben Lindstrom78ffe262004-02-27 03:01:19 +000078 login_get_lastlog(&li, uid);
79 strlcpy(buf, li.hostname, bufsize);
Damien Millera1690d02006-03-26 14:27:35 +110080 return (time_t)li.tv_sec;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100081}
82
Damien Miller5428f641999-11-25 11:54:57 +110083/*
Darren Tucker09991742004-07-17 17:05:14 +100084 * Generate and store last login message. This must be done before
85 * login_login() is called and lastlog is updated.
86 */
Darren Tucker133b7572004-08-12 22:50:03 +100087static void
Darren Tucker09991742004-07-17 17:05:14 +100088store_lastlog_message(const char *user, uid_t uid)
89{
Darren Tuckera422d972009-05-04 12:52:47 +100090#ifndef NO_SSH_LASTLOG
deraadt@openbsd.org087266e2015-01-20 23:14:00 +000091 char *time_string, hostname[HOST_NAME_MAX+1] = "", buf[512];
Darren Tucker09991742004-07-17 17:05:14 +100092 time_t last_login_time;
93
Darren Tucker09991742004-07-17 17:05:14 +100094 if (!options.print_lastlog)
95 return;
96
Darren Tuckerb5d5ee12009-08-17 09:40:00 +100097# ifdef CUSTOM_SYS_AUTH_GET_LASTLOGIN_MSG
98 time_string = sys_auth_get_lastlogin_msg(user, uid);
99 if (time_string != NULL) {
100 buffer_append(&loginmsg, time_string, strlen(time_string));
Darren Tuckerf60845f2013-06-02 08:07:31 +1000101 free(time_string);
Darren Tuckerb5d5ee12009-08-17 09:40:00 +1000102 }
103# else
Darren Tucker09991742004-07-17 17:05:14 +1000104 last_login_time = get_last_login_time(uid, user, hostname,
105 sizeof(hostname));
106
107 if (last_login_time != 0) {
108 time_string = ctime(&last_login_time);
Damien Miller14b017d2007-09-17 16:09:15 +1000109 time_string[strcspn(time_string, "\n")] = '\0';
Darren Tucker09991742004-07-17 17:05:14 +1000110 if (strcmp(hostname, "") == 0)
111 snprintf(buf, sizeof(buf), "Last login: %s\r\n",
112 time_string);
113 else
114 snprintf(buf, sizeof(buf), "Last login: %s from %s\r\n",
115 time_string, hostname);
116 buffer_append(&loginmsg, buf, strlen(buf));
117 }
Darren Tuckerb5d5ee12009-08-17 09:40:00 +1000118# endif /* CUSTOM_SYS_AUTH_GET_LASTLOGIN_MSG */
Darren Tucker09991742004-07-17 17:05:14 +1000119#endif /* NO_SSH_LASTLOG */
120}
121
122/*
Damien Miller469954d2003-06-18 20:25:33 +1000123 * Records that the user has logged in. I wish these parts of operating
124 * systems were more standardized.
Damien Miller5428f641999-11-25 11:54:57 +1100125 */
Damien Miller4af51302000-04-16 11:18:38 +1000126void
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000127record_login(pid_t pid, const char *tty, const char *user, uid_t uid,
Damien Miller90967402006-03-26 14:07:26 +1100128 const char *host, struct sockaddr *addr, socklen_t addrlen)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000129{
Ben Lindstrom78ffe262004-02-27 03:01:19 +0000130 struct logininfo *li;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000131
Darren Tucker09991742004-07-17 17:05:14 +1000132 /* save previous login details before writing new */
133 store_lastlog_message(user, uid);
134
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000135 li = login_alloc_entry(pid, user, host, tty);
Ben Lindstrom78ffe262004-02-27 03:01:19 +0000136 login_set_addr(li, addr, addrlen);
137 login_login(li);
138 login_free_entry(li);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000139}
Damien Miller95def091999-11-25 00:26:21 +1100140
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000141#ifdef LOGIN_NEEDS_UTMPX
142void
143record_utmp_only(pid_t pid, const char *ttyname, const char *user,
Damien Millere3b60b52006-07-10 21:08:03 +1000144 const char *host, struct sockaddr *addr, socklen_t addrlen)
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000145{
Ben Lindstrom78ffe262004-02-27 03:01:19 +0000146 struct logininfo *li;
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000147
Ben Lindstrom78ffe262004-02-27 03:01:19 +0000148 li = login_alloc_entry(pid, user, host, ttyname);
149 login_set_addr(li, addr, addrlen);
150 login_utmp_only(li);
151 login_free_entry(li);
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000152}
153#endif
154
Damien Miller95def091999-11-25 00:26:21 +1100155/* Records that the user has logged out. */
Damien Miller4af51302000-04-16 11:18:38 +1000156void
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000157record_logout(pid_t pid, const char *tty, const char *user)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000158{
Ben Lindstrom78ffe262004-02-27 03:01:19 +0000159 struct logininfo *li;
andre2ff7b5d2000-06-03 14:57:40 +0000160
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000161 li = login_alloc_entry(pid, user, NULL, tty);
Ben Lindstrom78ffe262004-02-27 03:01:19 +0000162 login_logout(li);
163 login_free_entry(li);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000164}