1 /* $OpenBSD: sshlogin.c,v 1.32 2015/12/26 20:51:35 guenther 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>
65 extern Buffer loginmsg
;
66 extern ServerOptions options
;
69 * Returns the time when the user last logged in. Returns 0 if the
70 * information is not available. This must be called before record_login.
71 * The host the user logged in from will be returned in buf.
74 get_last_login_time(uid_t uid
, const char *logname
,
75 char *buf
, size_t bufsize
)
79 login_get_lastlog(&li
, uid
);
80 strlcpy(buf
, li
.hostname
, bufsize
);
81 return (time_t)li
.tv_sec
;
85 * Generate and store last login message. This must be done before
86 * login_login() is called and lastlog is updated.
89 store_lastlog_message(const char *user
, uid_t uid
)
91 #ifndef NO_SSH_LASTLOG
92 char *time_string
, hostname
[HOST_NAME_MAX
+1] = "", buf
[512];
93 time_t last_login_time
;
95 if (!options
.print_lastlog
)
98 # ifdef CUSTOM_SYS_AUTH_GET_LASTLOGIN_MSG
99 time_string
= sys_auth_get_lastlogin_msg(user
, uid
);
100 if (time_string
!= NULL
) {
101 buffer_append(&loginmsg
, time_string
, strlen(time_string
));
105 last_login_time
= get_last_login_time(uid
, user
, hostname
,
108 if (last_login_time
!= 0) {
109 time_string
= ctime(&last_login_time
);
110 time_string
[strcspn(time_string
, "\n")] = '\0';
111 if (strcmp(hostname
, "") == 0)
112 snprintf(buf
, sizeof(buf
), "Last login: %s\r\n",
115 snprintf(buf
, sizeof(buf
), "Last login: %s from %s\r\n",
116 time_string
, hostname
);
117 buffer_append(&loginmsg
, buf
, strlen(buf
));
119 # endif /* CUSTOM_SYS_AUTH_GET_LASTLOGIN_MSG */
120 #endif /* NO_SSH_LASTLOG */
124 * Records that the user has logged in. I wish these parts of operating
125 * systems were more standardized.
128 record_login(pid_t pid
, const char *tty
, const char *user
, uid_t uid
,
129 const char *host
, struct sockaddr
*addr
, socklen_t addrlen
)
131 struct logininfo
*li
;
133 /* save previous login details before writing new */
134 store_lastlog_message(user
, uid
);
136 li
= login_alloc_entry(pid
, user
, host
, tty
);
137 login_set_addr(li
, addr
, addrlen
);
139 login_free_entry(li
);
142 #ifdef LOGIN_NEEDS_UTMPX
144 record_utmp_only(pid_t pid
, const char *ttyname
, const char *user
,
145 const char *host
, struct sockaddr
*addr
, socklen_t addrlen
)
147 struct logininfo
*li
;
149 li
= login_alloc_entry(pid
, user
, host
, ttyname
);
150 login_set_addr(li
, addr
, addrlen
);
152 login_free_entry(li
);
156 /* Records that the user has logged out. */
158 record_logout(pid_t pid
, const char *tty
, const char *user
)
160 struct logininfo
*li
;
162 li
= login_alloc_entry(pid
, user
, NULL
, tty
);
164 login_free_entry(li
);