Annotation of src/usr.bin/ssh/sshlogin.c, Revision 1.22
1.22 ! stevesk 1: /* $OpenBSD: sshlogin.c,v 1.21 2006/07/22 19:08:54 stevesk Exp $ */
1.1 djm 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:
1.20 stevesk 44: #include <sys/types.h>
45:
1.19 stevesk 46: #include <errno.h>
1.18 stevesk 47: #include <fcntl.h>
1.22 ! stevesk 48: #include <string.h>
1.21 stevesk 49: #include <time.h>
1.20 stevesk 50: #include <unistd.h>
1.1 djm 51: #include <util.h>
52: #include <utmp.h>
1.18 stevesk 53:
1.1 djm 54: #include "sshlogin.h"
55: #include "log.h"
1.10 dtucker 56: #include "buffer.h"
57: #include "servconf.h"
58:
59: extern Buffer loginmsg;
60: extern ServerOptions options;
1.1 djm 61:
62: /*
63: * Returns the time when the user last logged in. Returns 0 if the
64: * information is not available. This must be called before record_login.
65: * The host the user logged in from will be returned in buf.
66: */
1.17 deraadt 67: time_t
1.1 djm 68: get_last_login_time(uid_t uid, const char *logname,
1.17 deraadt 69: char *buf, size_t bufsize)
1.1 djm 70: {
71: struct lastlog ll;
72: char *lastlog;
73: int fd;
1.11 djm 74: off_t pos, r;
1.1 djm 75:
76: lastlog = _PATH_LASTLOG;
77: buf[0] = '\0';
78:
79: fd = open(lastlog, O_RDONLY);
80: if (fd < 0)
81: return 0;
1.11 djm 82:
83: pos = (long) uid * sizeof(ll);
84: r = lseek(fd, pos, SEEK_SET);
85: if (r == -1) {
1.13 djm 86: error("%s: lseek: %s", __func__, strerror(errno));
1.11 djm 87: return (0);
88: }
89: if (r != pos) {
90: debug("%s: truncated lastlog", __func__);
91: return (0);
92: }
1.1 djm 93: if (read(fd, &ll, sizeof(ll)) != sizeof(ll)) {
94: close(fd);
95: return 0;
96: }
97: close(fd);
98: if (bufsize > sizeof(ll.ll_host) + 1)
99: bufsize = sizeof(ll.ll_host) + 1;
100: strncpy(buf, ll.ll_host, bufsize - 1);
1.9 dtucker 101: buf[bufsize - 1] = '\0';
1.17 deraadt 102: return (time_t)ll.ll_time;
1.1 djm 103: }
104:
105: /*
1.10 dtucker 106: * Generate and store last login message. This must be done before
107: * login_login() is called and lastlog is updated.
108: */
1.12 djm 109: static void
1.10 dtucker 110: store_lastlog_message(const char *user, uid_t uid)
111: {
112: char *time_string, hostname[MAXHOSTNAMELEN] = "", buf[512];
113: time_t last_login_time;
114:
115: if (!options.print_lastlog)
116: return;
117:
118: last_login_time = get_last_login_time(uid, user, hostname,
119: sizeof(hostname));
120:
121: if (last_login_time != 0) {
122: time_string = ctime(&last_login_time);
123: if (strchr(time_string, '\n'))
124: *strchr(time_string, '\n') = '\0';
125: if (strcmp(hostname, "") == 0)
126: snprintf(buf, sizeof(buf), "Last login: %s\r\n",
127: time_string);
128: else
129: snprintf(buf, sizeof(buf), "Last login: %s from %s\r\n",
130: time_string, hostname);
131: buffer_append(&loginmsg, buf, strlen(buf));
132: }
133: }
134:
135: /*
1.7 markus 136: * Records that the user has logged in. I wish these parts of operating
137: * systems were more standardized.
1.1 djm 138: */
139: void
1.8 avsm 140: record_login(pid_t pid, const char *tty, const char *user, uid_t uid,
1.15 deraadt 141: const char *host, struct sockaddr *addr, socklen_t addrlen)
1.1 djm 142: {
143: int fd;
144: struct lastlog ll;
145: char *lastlog;
146: struct utmp u;
1.10 dtucker 147:
148: /* save previous login details before writing new */
149: store_lastlog_message(user, uid);
1.1 djm 150:
151: /* Construct an utmp/wtmp entry. */
152: memset(&u, 0, sizeof(u));
1.8 avsm 153: strncpy(u.ut_line, tty + 5, sizeof(u.ut_line));
1.1 djm 154: u.ut_time = time(NULL);
155: strncpy(u.ut_name, user, sizeof(u.ut_name));
156: strncpy(u.ut_host, host, sizeof(u.ut_host));
157:
158: login(&u);
159: lastlog = _PATH_LASTLOG;
160:
161: /* Update lastlog unless actually recording a logout. */
162: if (strcmp(user, "") != 0) {
163: /*
164: * It is safer to bzero the lastlog structure first because
165: * some systems might have some extra fields in it (e.g. SGI)
166: */
167: memset(&ll, 0, sizeof(ll));
168:
169: /* Update lastlog. */
170: ll.ll_time = time(NULL);
1.8 avsm 171: strncpy(ll.ll_line, tty + 5, sizeof(ll.ll_line));
1.1 djm 172: strncpy(ll.ll_host, host, sizeof(ll.ll_host));
173: fd = open(lastlog, O_RDWR);
174: if (fd >= 0) {
175: lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET);
176: if (write(fd, &ll, sizeof(ll)) != sizeof(ll))
1.6 itojun 177: logit("Could not write %.100s: %.100s", lastlog, strerror(errno));
1.1 djm 178: close(fd);
179: }
180: }
181: }
182:
183: /* Records that the user has logged out. */
184: void
1.8 avsm 185: record_logout(pid_t pid, const char *tty)
1.1 djm 186: {
1.8 avsm 187: const char *line = tty + 5; /* /dev/ttyq8 -> ttyq8 */
1.1 djm 188: if (logout(line))
189: logwtmp(line, "", "");
190: }