1 /* $OpenBSD: sshlogin.c,v 1.33 2018/07/09 21:26:02 markus 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/socket.h>
47 #include <netinet/in.h>
66 extern struct sshbuf *loginmsg;
67 extern ServerOptions options;
70 * Returns the time when the user last logged in. Returns 0 if the
71 * information is not available. This must be called before record_login.
72 * The host the user logged in from will be returned in buf.
75 get_last_login_time(uid_t uid, const char *logname,
76 char *buf, size_t bufsize)
80 login_get_lastlog(&li, uid);
81 strlcpy(buf, li.hostname, bufsize);
82 return (time_t)li.tv_sec;
86 * Generate and store last login message. This must be done before
87 * login_login() is called and lastlog is updated.
90 store_lastlog_message(const char *user, uid_t uid)
92 #ifndef NO_SSH_LASTLOG
93 char *time_string, hostname[HOST_NAME_MAX+1] = "";
94 time_t last_login_time;
97 if (!options.print_lastlog)
100 # ifdef CUSTOM_SYS_AUTH_GET_LASTLOGIN_MSG
101 time_string = sys_auth_get_lastlogin_msg(user, uid);
102 if (time_string != NULL) {
103 if ((r = sshbuf_put(loginmsg,
104 time_string, strlen(time_string))) != 0)
105 fatal("%s: buffer error: %s", __func__, ssh_err(r));
109 last_login_time = get_last_login_time(uid, user, hostname,
112 if (last_login_time != 0) {
113 time_string = ctime(&last_login_time);
114 time_string[strcspn(time_string, "\n")] = '\0';
115 if (strcmp(hostname, "") == 0)
116 r = sshbuf_putf(loginmsg, "Last login: %s\r\n",
119 r = sshbuf_putf(loginmsg, "Last login: %s from %s\r\n",
120 time_string, hostname);
122 fatal("%s: buffer error: %s", __func__, ssh_err(r));
124 # endif /* CUSTOM_SYS_AUTH_GET_LASTLOGIN_MSG */
125 #endif /* NO_SSH_LASTLOG */
129 * Records that the user has logged in. I wish these parts of operating
130 * systems were more standardized.
133 record_login(pid_t pid, const char *tty, const char *user, uid_t uid,
134 const char *host, struct sockaddr *addr, socklen_t addrlen)
136 struct logininfo *li;
138 /* save previous login details before writing new */
139 store_lastlog_message(user, uid);
141 li = login_alloc_entry(pid, user, host, tty);
142 login_set_addr(li, addr, addrlen);
144 login_free_entry(li);
147 #ifdef LOGIN_NEEDS_UTMPX
149 record_utmp_only(pid_t pid, const char *ttyname, const char *user,
150 const char *host, struct sockaddr *addr, socklen_t addrlen)
152 struct logininfo *li;
154 li = login_alloc_entry(pid, user, host, ttyname);
155 login_set_addr(li, addr, addrlen);
157 login_free_entry(li);
161 /* Records that the user has logged out. */
163 record_logout(pid_t pid, const char *tty, const char *user)
165 struct logininfo *li;
167 li = login_alloc_entry(pid, user, NULL, tty);
169 login_free_entry(li);