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1 | /* $OpenBSD: sshlogin.c,v 1.19 2006/07/11 20:07:25 stevesk Exp $ */ | |
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" | |
43 | ||
44 | #include <errno.h> | |
45 | #include <fcntl.h> | |
46 | ||
47 | #include "loginrec.h" | |
48 | #include "log.h" | |
49 | #include "buffer.h" | |
50 | #include "servconf.h" | |
51 | ||
52 | extern Buffer loginmsg; | |
53 | extern ServerOptions options; | |
54 | ||
55 | /* | |
56 | * Returns the time when the user last logged in. Returns 0 if the | |
57 | * information is not available. This must be called before record_login. | |
58 | * The host the user logged in from will be returned in buf. | |
59 | */ | |
60 | time_t | |
61 | get_last_login_time(uid_t uid, const char *logname, | |
62 | char *buf, size_t bufsize) | |
63 | { | |
64 | struct logininfo li; | |
65 | ||
66 | login_get_lastlog(&li, uid); | |
67 | strlcpy(buf, li.hostname, bufsize); | |
68 | return (time_t)li.tv_sec; | |
69 | } | |
70 | ||
71 | /* | |
72 | * Generate and store last login message. This must be done before | |
73 | * login_login() is called and lastlog is updated. | |
74 | */ | |
75 | static void | |
76 | store_lastlog_message(const char *user, uid_t uid) | |
77 | { | |
78 | char *time_string, hostname[MAXHOSTNAMELEN] = "", buf[512]; | |
79 | time_t last_login_time; | |
80 | ||
81 | #ifndef NO_SSH_LASTLOG | |
82 | if (!options.print_lastlog) | |
83 | return; | |
84 | ||
85 | last_login_time = get_last_login_time(uid, user, hostname, | |
86 | sizeof(hostname)); | |
87 | ||
88 | if (last_login_time != 0) { | |
89 | time_string = ctime(&last_login_time); | |
90 | if (strchr(time_string, '\n')) | |
91 | *strchr(time_string, '\n') = '\0'; | |
92 | if (strcmp(hostname, "") == 0) | |
93 | snprintf(buf, sizeof(buf), "Last login: %s\r\n", | |
94 | time_string); | |
95 | else | |
96 | snprintf(buf, sizeof(buf), "Last login: %s from %s\r\n", | |
97 | time_string, hostname); | |
98 | buffer_append(&loginmsg, buf, strlen(buf)); | |
99 | } | |
100 | #endif /* NO_SSH_LASTLOG */ | |
101 | } | |
102 | ||
103 | /* | |
104 | * Records that the user has logged in. I wish these parts of operating | |
105 | * systems were more standardized. | |
106 | */ | |
107 | void | |
108 | record_login(pid_t pid, const char *tty, const char *user, uid_t uid, | |
109 | const char *host, struct sockaddr *addr, socklen_t addrlen) | |
110 | { | |
111 | struct logininfo *li; | |
112 | ||
113 | /* save previous login details before writing new */ | |
114 | store_lastlog_message(user, uid); | |
115 | ||
116 | li = login_alloc_entry(pid, user, host, tty); | |
117 | login_set_addr(li, addr, addrlen); | |
118 | login_login(li); | |
119 | login_free_entry(li); | |
120 | } | |
121 | ||
122 | #ifdef LOGIN_NEEDS_UTMPX | |
123 | void | |
124 | record_utmp_only(pid_t pid, const char *ttyname, const char *user, | |
125 | const char *host, struct sockaddr *addr, socklen_t addrlen) | |
126 | { | |
127 | struct logininfo *li; | |
128 | ||
129 | li = login_alloc_entry(pid, user, host, ttyname); | |
130 | login_set_addr(li, addr, addrlen); | |
131 | login_utmp_only(li); | |
132 | login_free_entry(li); | |
133 | } | |
134 | #endif | |
135 | ||
136 | /* Records that the user has logged out. */ | |
137 | void | |
138 | record_logout(pid_t pid, const char *tty, const char *user) | |
139 | { | |
140 | struct logininfo *li; | |
141 | ||
142 | li = login_alloc_entry(pid, user, NULL, tty); | |
143 | login_logout(li); | |
144 | login_free_entry(li); | |
145 | } |