1 /* $OpenBSD: sshlogin.c,v 1.26 2007/09/11 15:47:17 gilles Exp $ */
3 * Author: Tatu Ylonen <ylo@cs.hut.fi>
4 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
6 * 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
12 * 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".
18 * Copyright (c) 1999 Theo de Raadt. All rights reserved.
19 * Copyright (c) 1999 Markus Friedl. All rights reserved.
21 * Redistribution and use in source and binary forms, with or without
22 * modification, are permitted provided that the following conditions
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.
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.
44 #include <sys/types.h>
45 #include <sys/param.h>
46 #include <sys/socket.h>
48 #include <netinet/in.h>
63 extern Buffer loginmsg;
64 extern ServerOptions options;
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.
72 get_last_login_time(uid_t uid, const char *logname,
73 char *buf, size_t bufsize)
77 login_get_lastlog(&li, uid);
78 strlcpy(buf, li.hostname, bufsize);
79 return (time_t)li.tv_sec;
83 * Generate and store last login message. This must be done before
84 * login_login() is called and lastlog is updated.
87 store_lastlog_message(const char *user, uid_t uid)
89 #ifndef NO_SSH_LASTLOG
90 char *time_string, hostname[MAXHOSTNAMELEN] = "", buf[512];
91 time_t last_login_time;
93 if (!options.print_lastlog)
96 # 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));
103 last_login_time = get_last_login_time(uid, user, hostname,
106 if (last_login_time != 0) {
107 time_string = ctime(&last_login_time);
108 time_string[strcspn(time_string, "\n")] = '\0';
109 if (strcmp(hostname, "") == 0)
110 snprintf(buf, sizeof(buf), "Last login: %s\r\n",
113 snprintf(buf, sizeof(buf), "Last login: %s from %s\r\n",
114 time_string, hostname);
115 buffer_append(&loginmsg, buf, strlen(buf));
117 # endif /* CUSTOM_SYS_AUTH_GET_LASTLOGIN_MSG */
118 #endif /* NO_SSH_LASTLOG */
122 * Records that the user has logged in. I wish these parts of operating
123 * systems were more standardized.
126 record_login(pid_t pid, const char *tty, const char *user, uid_t uid,
127 const char *host, struct sockaddr *addr, socklen_t addrlen)
129 struct logininfo *li;
131 /* save previous login details before writing new */
132 store_lastlog_message(user, uid);
134 li = login_alloc_entry(pid, user, host, tty);
135 login_set_addr(li, addr, addrlen);
137 login_free_entry(li);
140 #ifdef LOGIN_NEEDS_UTMPX
142 record_utmp_only(pid_t pid, const char *ttyname, const char *user,
143 const char *host, struct sockaddr *addr, socklen_t addrlen)
145 struct logininfo *li;
147 li = login_alloc_entry(pid, user, host, ttyname);
148 login_set_addr(li, addr, addrlen);
150 login_free_entry(li);
154 /* Records that the user has logged out. */
156 record_logout(pid_t pid, const char *tty, const char *user)
158 struct logininfo *li;
160 li = login_alloc_entry(pid, user, NULL, tty);
162 login_free_entry(li);