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b05117ac | 1 | /* $OpenBSD: sshlogin.c,v 1.26 2007/09/11 15:47:17 gilles Exp $ */ |
8efc0c15 | 2 | /* |
5260325f | 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
5260325f | 4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
5 | * All rights reserved | |
5260325f | 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. | |
6ae2364d | 11 | * |
bcbf86ec | 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. | |
5260325f | 40 | */ |
8efc0c15 | 41 | |
42 | #include "includes.h" | |
8efc0c15 | 43 | |
5188ba17 | 44 | #include <sys/types.h> |
536c14e8 | 45 | #include <sys/param.h> |
31652869 | 46 | #include <sys/socket.h> |
5188ba17 | 47 | |
8ad2db2a | 48 | #include <netinet/in.h> |
49 | ||
028094f4 | 50 | #include <errno.h> |
d3221cca | 51 | #include <fcntl.h> |
31652869 | 52 | #include <stdarg.h> |
cf851879 | 53 | #include <stdio.h> |
00146caa | 54 | #include <string.h> |
b0f6943a | 55 | #include <time.h> |
5188ba17 | 56 | #include <unistd.h> |
d3221cca | 57 | |
1d7b9b20 | 58 | #include "loginrec.h" |
be2ca0c9 | 59 | #include "log.h" |
60 | #include "buffer.h" | |
61 | #include "servconf.h" | |
62 | ||
63 | extern Buffer loginmsg; | |
64 | extern ServerOptions options; | |
5daf7064 | 65 | |
aa3378df | 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 | */ | |
306f24ca | 71 | time_t |
5260325f | 72 | get_last_login_time(uid_t uid, const char *logname, |
306f24ca | 73 | char *buf, size_t bufsize) |
8efc0c15 | 74 | { |
769a750c | 75 | struct logininfo li; |
a7effaac | 76 | |
769a750c | 77 | login_get_lastlog(&li, uid); |
78 | strlcpy(buf, li.hostname, bufsize); | |
306f24ca | 79 | return (time_t)li.tv_sec; |
8efc0c15 | 80 | } |
81 | ||
be2ca0c9 | 82 | /* |
83 | * Generate and store last login message. This must be done before | |
84 | * login_login() is called and lastlog is updated. | |
85 | */ | |
7456203e | 86 | static void |
be2ca0c9 | 87 | store_lastlog_message(const char *user, uid_t uid) |
88 | { | |
6ee76eea | 89 | #ifndef NO_SSH_LASTLOG |
be2ca0c9 | 90 | char *time_string, hostname[MAXHOSTNAMELEN] = "", buf[512]; |
91 | time_t last_login_time; | |
92 | ||
be2ca0c9 | 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); | |
b05117ac | 101 | time_string[strcspn(time_string, "\n")] = '\0'; |
be2ca0c9 | 102 | if (strcmp(hostname, "") == 0) |
103 | snprintf(buf, sizeof(buf), "Last login: %s\r\n", | |
104 | time_string); | |
105 | else | |
106 | snprintf(buf, sizeof(buf), "Last login: %s from %s\r\n", | |
107 | time_string, hostname); | |
108 | buffer_append(&loginmsg, buf, strlen(buf)); | |
109 | } | |
110 | #endif /* NO_SSH_LASTLOG */ | |
111 | } | |
112 | ||
aa3378df | 113 | /* |
b8e04133 | 114 | * Records that the user has logged in. I wish these parts of operating |
115 | * systems were more standardized. | |
aa3378df | 116 | */ |
6ae2364d | 117 | void |
ca75d7de | 118 | record_login(pid_t pid, const char *tty, const char *user, uid_t uid, |
32596c7b | 119 | const char *host, struct sockaddr *addr, socklen_t addrlen) |
8efc0c15 | 120 | { |
769a750c | 121 | struct logininfo *li; |
8efc0c15 | 122 | |
be2ca0c9 | 123 | /* save previous login details before writing new */ |
124 | store_lastlog_message(user, uid); | |
125 | ||
ca75d7de | 126 | li = login_alloc_entry(pid, user, host, tty); |
769a750c | 127 | login_set_addr(li, addr, addrlen); |
128 | login_login(li); | |
129 | login_free_entry(li); | |
8efc0c15 | 130 | } |
5260325f | 131 | |
7e2d5fa4 | 132 | #ifdef LOGIN_NEEDS_UTMPX |
133 | void | |
134 | record_utmp_only(pid_t pid, const char *ttyname, const char *user, | |
5b04a8bf | 135 | const char *host, struct sockaddr *addr, socklen_t addrlen) |
7e2d5fa4 | 136 | { |
769a750c | 137 | struct logininfo *li; |
7e2d5fa4 | 138 | |
769a750c | 139 | li = login_alloc_entry(pid, user, host, ttyname); |
140 | login_set_addr(li, addr, addrlen); | |
141 | login_utmp_only(li); | |
142 | login_free_entry(li); | |
7e2d5fa4 | 143 | } |
144 | #endif | |
145 | ||
5260325f | 146 | /* Records that the user has logged out. */ |
6ae2364d | 147 | void |
ca75d7de | 148 | record_logout(pid_t pid, const char *tty, const char *user) |
8efc0c15 | 149 | { |
769a750c | 150 | struct logininfo *li; |
1d7b9b20 | 151 | |
ca75d7de | 152 | li = login_alloc_entry(pid, user, NULL, tty); |
769a750c | 153 | login_logout(li); |
154 | login_free_entry(li); | |
8efc0c15 | 155 | } |