Annotation of src/usr.bin/ssh/sshlogin.c, Revision 1.17
1.17 ! deraadt 1: /* $OpenBSD: sshlogin.c,v 1.16 2006/03/25 13:17:03 djm 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:
44: #include <util.h>
45: #include <utmp.h>
46: #include "sshlogin.h"
47: #include "log.h"
1.10 dtucker 48: #include "buffer.h"
49: #include "servconf.h"
50:
51: extern Buffer loginmsg;
52: extern ServerOptions options;
1.1 djm 53:
54: /*
55: * Returns the time when the user last logged in. Returns 0 if the
56: * information is not available. This must be called before record_login.
57: * The host the user logged in from will be returned in buf.
58: */
1.17 ! deraadt 59: time_t
1.1 djm 60: get_last_login_time(uid_t uid, const char *logname,
1.17 ! deraadt 61: char *buf, size_t bufsize)
1.1 djm 62: {
63: struct lastlog ll;
64: char *lastlog;
65: int fd;
1.11 djm 66: off_t pos, r;
1.1 djm 67:
68: lastlog = _PATH_LASTLOG;
69: buf[0] = '\0';
70:
71: fd = open(lastlog, O_RDONLY);
72: if (fd < 0)
73: return 0;
1.11 djm 74:
75: pos = (long) uid * sizeof(ll);
76: r = lseek(fd, pos, SEEK_SET);
77: if (r == -1) {
1.13 djm 78: error("%s: lseek: %s", __func__, strerror(errno));
1.11 djm 79: return (0);
80: }
81: if (r != pos) {
82: debug("%s: truncated lastlog", __func__);
83: return (0);
84: }
1.1 djm 85: if (read(fd, &ll, sizeof(ll)) != sizeof(ll)) {
86: close(fd);
87: return 0;
88: }
89: close(fd);
90: if (bufsize > sizeof(ll.ll_host) + 1)
91: bufsize = sizeof(ll.ll_host) + 1;
92: strncpy(buf, ll.ll_host, bufsize - 1);
1.9 dtucker 93: buf[bufsize - 1] = '\0';
1.17 ! deraadt 94: return (time_t)ll.ll_time;
1.1 djm 95: }
96:
97: /*
1.10 dtucker 98: * Generate and store last login message. This must be done before
99: * login_login() is called and lastlog is updated.
100: */
1.12 djm 101: static void
1.10 dtucker 102: store_lastlog_message(const char *user, uid_t uid)
103: {
104: char *time_string, hostname[MAXHOSTNAMELEN] = "", buf[512];
105: time_t last_login_time;
106:
107: if (!options.print_lastlog)
108: return;
109:
110: last_login_time = get_last_login_time(uid, user, hostname,
111: sizeof(hostname));
112:
113: if (last_login_time != 0) {
114: time_string = ctime(&last_login_time);
115: if (strchr(time_string, '\n'))
116: *strchr(time_string, '\n') = '\0';
117: if (strcmp(hostname, "") == 0)
118: snprintf(buf, sizeof(buf), "Last login: %s\r\n",
119: time_string);
120: else
121: snprintf(buf, sizeof(buf), "Last login: %s from %s\r\n",
122: time_string, hostname);
123: buffer_append(&loginmsg, buf, strlen(buf));
124: }
125: }
126:
127: /*
1.7 markus 128: * Records that the user has logged in. I wish these parts of operating
129: * systems were more standardized.
1.1 djm 130: */
131: void
1.8 avsm 132: record_login(pid_t pid, const char *tty, const char *user, uid_t uid,
1.15 deraadt 133: const char *host, struct sockaddr *addr, socklen_t addrlen)
1.1 djm 134: {
135: int fd;
136: struct lastlog ll;
137: char *lastlog;
138: struct utmp u;
1.10 dtucker 139:
140: /* save previous login details before writing new */
141: store_lastlog_message(user, uid);
1.1 djm 142:
143: /* Construct an utmp/wtmp entry. */
144: memset(&u, 0, sizeof(u));
1.8 avsm 145: strncpy(u.ut_line, tty + 5, sizeof(u.ut_line));
1.1 djm 146: u.ut_time = time(NULL);
147: strncpy(u.ut_name, user, sizeof(u.ut_name));
148: strncpy(u.ut_host, host, sizeof(u.ut_host));
149:
150: login(&u);
151: lastlog = _PATH_LASTLOG;
152:
153: /* Update lastlog unless actually recording a logout. */
154: if (strcmp(user, "") != 0) {
155: /*
156: * It is safer to bzero the lastlog structure first because
157: * some systems might have some extra fields in it (e.g. SGI)
158: */
159: memset(&ll, 0, sizeof(ll));
160:
161: /* Update lastlog. */
162: ll.ll_time = time(NULL);
1.8 avsm 163: strncpy(ll.ll_line, tty + 5, sizeof(ll.ll_line));
1.1 djm 164: strncpy(ll.ll_host, host, sizeof(ll.ll_host));
165: fd = open(lastlog, O_RDWR);
166: if (fd >= 0) {
167: lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET);
168: if (write(fd, &ll, sizeof(ll)) != sizeof(ll))
1.6 itojun 169: logit("Could not write %.100s: %.100s", lastlog, strerror(errno));
1.1 djm 170: close(fd);
171: }
172: }
173: }
174:
175: /* Records that the user has logged out. */
176: void
1.8 avsm 177: record_logout(pid_t pid, const char *tty)
1.1 djm 178: {
1.8 avsm 179: const char *line = tty + 5; /* /dev/ttyq8 -> ttyq8 */
1.1 djm 180: if (logout(line))
181: logwtmp(line, "", "");
182: }
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