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2e437378 | 1 | /* $OpenBSD: sshlogin.c,v 1.25 2006/08/03 03:34:42 deraadt Exp $ */ |
3c0ef626 | 2 | /* |
3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> | |
4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
5 | * All rights reserved | |
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 | |
10 | * on a tty. | |
11 | * | |
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". | |
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. | |
40 | */ | |
41 | ||
42 | #include "includes.h" | |
2e437378 | 43 | |
44 | #include <sys/types.h> | |
45 | #include <sys/param.h> | |
46 | #include <sys/socket.h> | |
47 | ||
48 | #include <netinet/in.h> | |
49 | ||
50 | #include <errno.h> | |
51 | #include <fcntl.h> | |
52 | #include <stdarg.h> | |
53 | #include <stdio.h> | |
54 | #include <string.h> | |
55 | #include <time.h> | |
56 | #include <unistd.h> | |
3c0ef626 | 57 | |
58 | #include "loginrec.h" | |
1b56ff3d | 59 | #include "log.h" |
60 | #include "buffer.h" | |
61 | #include "servconf.h" | |
62 | ||
63 | extern Buffer loginmsg; | |
64 | extern ServerOptions options; | |
3c0ef626 | 65 | |
66 | /* | |
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 | */ | |
2e437378 | 71 | time_t |
3c0ef626 | 72 | get_last_login_time(uid_t uid, const char *logname, |
2e437378 | 73 | char *buf, size_t bufsize) |
3c0ef626 | 74 | { |
2a304a95 | 75 | struct logininfo li; |
3c0ef626 | 76 | |
2a304a95 | 77 | login_get_lastlog(&li, uid); |
78 | strlcpy(buf, li.hostname, bufsize); | |
2e437378 | 79 | return (time_t)li.tv_sec; |
3c0ef626 | 80 | } |
81 | ||
1b56ff3d | 82 | /* |
83 | * Generate and store last login message. This must be done before | |
84 | * login_login() is called and lastlog is updated. | |
85 | */ | |
86 | static void | |
87 | store_lastlog_message(const char *user, uid_t uid) | |
88 | { | |
89 | char *time_string, hostname[MAXHOSTNAMELEN] = "", buf[512]; | |
90 | time_t last_login_time; | |
91 | ||
92 | #ifndef NO_SSH_LASTLOG | |
93 | if (!options.print_lastlog) | |
94 | return; | |
95 | ||
96 | last_login_time = get_last_login_time(uid, user, hostname, | |
97 | sizeof(hostname)); | |
98 | ||
99 | if (last_login_time != 0) { | |
100 | time_string = ctime(&last_login_time); | |
101 | if (strchr(time_string, '\n')) | |
102 | *strchr(time_string, '\n') = '\0'; | |
103 | if (strcmp(hostname, "") == 0) | |
104 | snprintf(buf, sizeof(buf), "Last login: %s\r\n", | |
105 | time_string); | |
106 | else | |
107 | snprintf(buf, sizeof(buf), "Last login: %s from %s\r\n", | |
108 | time_string, hostname); | |
109 | buffer_append(&loginmsg, buf, strlen(buf)); | |
110 | } | |
111 | #endif /* NO_SSH_LASTLOG */ | |
112 | } | |
113 | ||
3c0ef626 | 114 | /* |
70791e56 | 115 | * Records that the user has logged in. I wish these parts of operating |
116 | * systems were more standardized. | |
3c0ef626 | 117 | */ |
3c0ef626 | 118 | void |
1b56ff3d | 119 | record_login(pid_t pid, const char *tty, const char *user, uid_t uid, |
2e437378 | 120 | const char *host, struct sockaddr *addr, socklen_t addrlen) |
3c0ef626 | 121 | { |
2a304a95 | 122 | struct logininfo *li; |
3c0ef626 | 123 | |
1b56ff3d | 124 | /* save previous login details before writing new */ |
125 | store_lastlog_message(user, uid); | |
126 | ||
127 | li = login_alloc_entry(pid, user, host, tty); | |
2a304a95 | 128 | login_set_addr(li, addr, addrlen); |
129 | login_login(li); | |
130 | login_free_entry(li); | |
3c0ef626 | 131 | } |
132 | ||
133 | #ifdef LOGIN_NEEDS_UTMPX | |
134 | void | |
135 | record_utmp_only(pid_t pid, const char *ttyname, const char *user, | |
2e437378 | 136 | const char *host, struct sockaddr *addr, socklen_t addrlen) |
3c0ef626 | 137 | { |
2a304a95 | 138 | struct logininfo *li; |
3c0ef626 | 139 | |
2a304a95 | 140 | li = login_alloc_entry(pid, user, host, ttyname); |
141 | login_set_addr(li, addr, addrlen); | |
142 | login_utmp_only(li); | |
143 | login_free_entry(li); | |
3c0ef626 | 144 | } |
145 | #endif | |
146 | ||
147 | /* Records that the user has logged out. */ | |
3c0ef626 | 148 | void |
1b56ff3d | 149 | record_logout(pid_t pid, const char *tty, const char *user) |
3c0ef626 | 150 | { |
2a304a95 | 151 | struct logininfo *li; |
3c0ef626 | 152 | |
1b56ff3d | 153 | li = login_alloc_entry(pid, user, NULL, tty); |
2a304a95 | 154 | login_logout(li); |
155 | login_free_entry(li); | |
3c0ef626 | 156 | } |