Annotation of src/usr.bin/ssh/sshlogin.c, Revision 1.27
1.27 ! djm 1: /* $OpenBSD: sshlogin.c,v 1.26 2007/09/11 15:47:17 gilles 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:
1.20 stevesk 42: #include <sys/types.h>
1.23 stevesk 43: #include <sys/param.h>
1.25 deraadt 44: #include <sys/socket.h>
1.20 stevesk 45:
1.19 stevesk 46: #include <errno.h>
1.18 stevesk 47: #include <fcntl.h>
1.24 stevesk 48: #include <stdio.h>
1.22 stevesk 49: #include <string.h>
1.21 stevesk 50: #include <time.h>
1.20 stevesk 51: #include <unistd.h>
1.1 djm 52: #include <util.h>
53: #include <utmp.h>
1.25 deraadt 54: #include <stdarg.h>
1.18 stevesk 55:
1.1 djm 56: #include "sshlogin.h"
57: #include "log.h"
1.10 dtucker 58: #include "buffer.h"
59: #include "servconf.h"
60:
61: extern Buffer loginmsg;
62: extern ServerOptions options;
1.1 djm 63:
64: /*
65: * Returns the time when the user last logged in. Returns 0 if the
66: * information is not available. This must be called before record_login.
67: * The host the user logged in from will be returned in buf.
68: */
1.17 deraadt 69: time_t
1.1 djm 70: get_last_login_time(uid_t uid, const char *logname,
1.17 deraadt 71: char *buf, size_t bufsize)
1.1 djm 72: {
73: struct lastlog ll;
74: char *lastlog;
75: int fd;
1.11 djm 76: off_t pos, r;
1.1 djm 77:
78: lastlog = _PATH_LASTLOG;
79: buf[0] = '\0';
80:
81: fd = open(lastlog, O_RDONLY);
82: if (fd < 0)
83: return 0;
1.11 djm 84:
85: pos = (long) uid * sizeof(ll);
86: r = lseek(fd, pos, SEEK_SET);
87: if (r == -1) {
1.13 djm 88: error("%s: lseek: %s", __func__, strerror(errno));
1.27 ! djm 89: close(fd);
1.11 djm 90: return (0);
91: }
92: if (r != pos) {
93: debug("%s: truncated lastlog", __func__);
1.27 ! djm 94: close(fd);
1.11 djm 95: return (0);
96: }
1.1 djm 97: if (read(fd, &ll, sizeof(ll)) != sizeof(ll)) {
98: close(fd);
99: return 0;
100: }
101: close(fd);
102: if (bufsize > sizeof(ll.ll_host) + 1)
103: bufsize = sizeof(ll.ll_host) + 1;
104: strncpy(buf, ll.ll_host, bufsize - 1);
1.9 dtucker 105: buf[bufsize - 1] = '\0';
1.17 deraadt 106: return (time_t)ll.ll_time;
1.1 djm 107: }
108:
109: /*
1.10 dtucker 110: * Generate and store last login message. This must be done before
111: * login_login() is called and lastlog is updated.
112: */
1.12 djm 113: static void
1.10 dtucker 114: store_lastlog_message(const char *user, uid_t uid)
115: {
116: char *time_string, hostname[MAXHOSTNAMELEN] = "", buf[512];
117: time_t last_login_time;
118:
119: if (!options.print_lastlog)
120: return;
121:
122: last_login_time = get_last_login_time(uid, user, hostname,
123: sizeof(hostname));
124:
125: if (last_login_time != 0) {
126: time_string = ctime(&last_login_time);
1.26 gilles 127: time_string[strcspn(time_string, "\n")] = '\0';
1.10 dtucker 128: if (strcmp(hostname, "") == 0)
129: snprintf(buf, sizeof(buf), "Last login: %s\r\n",
130: time_string);
131: else
132: snprintf(buf, sizeof(buf), "Last login: %s from %s\r\n",
133: time_string, hostname);
134: buffer_append(&loginmsg, buf, strlen(buf));
135: }
136: }
137:
138: /*
1.7 markus 139: * Records that the user has logged in. I wish these parts of operating
140: * systems were more standardized.
1.1 djm 141: */
142: void
1.8 avsm 143: record_login(pid_t pid, const char *tty, const char *user, uid_t uid,
1.15 deraadt 144: const char *host, struct sockaddr *addr, socklen_t addrlen)
1.1 djm 145: {
146: int fd;
147: struct lastlog ll;
148: char *lastlog;
149: struct utmp u;
1.10 dtucker 150:
151: /* save previous login details before writing new */
152: store_lastlog_message(user, uid);
1.1 djm 153:
154: /* Construct an utmp/wtmp entry. */
155: memset(&u, 0, sizeof(u));
1.8 avsm 156: strncpy(u.ut_line, tty + 5, sizeof(u.ut_line));
1.1 djm 157: u.ut_time = time(NULL);
158: strncpy(u.ut_name, user, sizeof(u.ut_name));
159: strncpy(u.ut_host, host, sizeof(u.ut_host));
160:
161: login(&u);
162: lastlog = _PATH_LASTLOG;
163:
164: /* Update lastlog unless actually recording a logout. */
165: if (strcmp(user, "") != 0) {
166: /*
167: * It is safer to bzero the lastlog structure first because
168: * some systems might have some extra fields in it (e.g. SGI)
169: */
170: memset(&ll, 0, sizeof(ll));
171:
172: /* Update lastlog. */
173: ll.ll_time = time(NULL);
1.8 avsm 174: strncpy(ll.ll_line, tty + 5, sizeof(ll.ll_line));
1.1 djm 175: strncpy(ll.ll_host, host, sizeof(ll.ll_host));
176: fd = open(lastlog, O_RDWR);
177: if (fd >= 0) {
178: lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET);
179: if (write(fd, &ll, sizeof(ll)) != sizeof(ll))
1.6 itojun 180: logit("Could not write %.100s: %.100s", lastlog, strerror(errno));
1.1 djm 181: close(fd);
182: }
183: }
184: }
185:
186: /* Records that the user has logged out. */
187: void
1.8 avsm 188: record_logout(pid_t pid, const char *tty)
1.1 djm 189: {
1.8 avsm 190: const char *line = tty + 5; /* /dev/ttyq8 -> ttyq8 */
1.1 djm 191: if (logout(line))
192: logwtmp(line, "", "");
193: }
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