Annotation of src/usr.bin/ssh/sshlogin.c, Revision 1.18
1.18 ! stevesk 1: /* $OpenBSD: sshlogin.c,v 1.17 2006/03/25 18:36:15 deraadt 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:
1.18 ! stevesk 44: #include <fcntl.h>
1.1 djm 45: #include <util.h>
46: #include <utmp.h>
1.18 ! stevesk 47:
1.1 djm 48: #include "sshlogin.h"
49: #include "log.h"
1.10 dtucker 50: #include "buffer.h"
51: #include "servconf.h"
52:
53: extern Buffer loginmsg;
54: extern ServerOptions options;
1.1 djm 55:
56: /*
57: * Returns the time when the user last logged in. Returns 0 if the
58: * information is not available. This must be called before record_login.
59: * The host the user logged in from will be returned in buf.
60: */
1.17 deraadt 61: time_t
1.1 djm 62: get_last_login_time(uid_t uid, const char *logname,
1.17 deraadt 63: char *buf, size_t bufsize)
1.1 djm 64: {
65: struct lastlog ll;
66: char *lastlog;
67: int fd;
1.11 djm 68: off_t pos, r;
1.1 djm 69:
70: lastlog = _PATH_LASTLOG;
71: buf[0] = '\0';
72:
73: fd = open(lastlog, O_RDONLY);
74: if (fd < 0)
75: return 0;
1.11 djm 76:
77: pos = (long) uid * sizeof(ll);
78: r = lseek(fd, pos, SEEK_SET);
79: if (r == -1) {
1.13 djm 80: error("%s: lseek: %s", __func__, strerror(errno));
1.11 djm 81: return (0);
82: }
83: if (r != pos) {
84: debug("%s: truncated lastlog", __func__);
85: return (0);
86: }
1.1 djm 87: if (read(fd, &ll, sizeof(ll)) != sizeof(ll)) {
88: close(fd);
89: return 0;
90: }
91: close(fd);
92: if (bufsize > sizeof(ll.ll_host) + 1)
93: bufsize = sizeof(ll.ll_host) + 1;
94: strncpy(buf, ll.ll_host, bufsize - 1);
1.9 dtucker 95: buf[bufsize - 1] = '\0';
1.17 deraadt 96: return (time_t)ll.ll_time;
1.1 djm 97: }
98:
99: /*
1.10 dtucker 100: * Generate and store last login message. This must be done before
101: * login_login() is called and lastlog is updated.
102: */
1.12 djm 103: static void
1.10 dtucker 104: store_lastlog_message(const char *user, uid_t uid)
105: {
106: char *time_string, hostname[MAXHOSTNAMELEN] = "", buf[512];
107: time_t last_login_time;
108:
109: if (!options.print_lastlog)
110: return;
111:
112: last_login_time = get_last_login_time(uid, user, hostname,
113: sizeof(hostname));
114:
115: if (last_login_time != 0) {
116: time_string = ctime(&last_login_time);
117: if (strchr(time_string, '\n'))
118: *strchr(time_string, '\n') = '\0';
119: if (strcmp(hostname, "") == 0)
120: snprintf(buf, sizeof(buf), "Last login: %s\r\n",
121: time_string);
122: else
123: snprintf(buf, sizeof(buf), "Last login: %s from %s\r\n",
124: time_string, hostname);
125: buffer_append(&loginmsg, buf, strlen(buf));
126: }
127: }
128:
129: /*
1.7 markus 130: * Records that the user has logged in. I wish these parts of operating
131: * systems were more standardized.
1.1 djm 132: */
133: void
1.8 avsm 134: record_login(pid_t pid, const char *tty, const char *user, uid_t uid,
1.15 deraadt 135: const char *host, struct sockaddr *addr, socklen_t addrlen)
1.1 djm 136: {
137: int fd;
138: struct lastlog ll;
139: char *lastlog;
140: struct utmp u;
1.10 dtucker 141:
142: /* save previous login details before writing new */
143: store_lastlog_message(user, uid);
1.1 djm 144:
145: /* Construct an utmp/wtmp entry. */
146: memset(&u, 0, sizeof(u));
1.8 avsm 147: strncpy(u.ut_line, tty + 5, sizeof(u.ut_line));
1.1 djm 148: u.ut_time = time(NULL);
149: strncpy(u.ut_name, user, sizeof(u.ut_name));
150: strncpy(u.ut_host, host, sizeof(u.ut_host));
151:
152: login(&u);
153: lastlog = _PATH_LASTLOG;
154:
155: /* Update lastlog unless actually recording a logout. */
156: if (strcmp(user, "") != 0) {
157: /*
158: * It is safer to bzero the lastlog structure first because
159: * some systems might have some extra fields in it (e.g. SGI)
160: */
161: memset(&ll, 0, sizeof(ll));
162:
163: /* Update lastlog. */
164: ll.ll_time = time(NULL);
1.8 avsm 165: strncpy(ll.ll_line, tty + 5, sizeof(ll.ll_line));
1.1 djm 166: strncpy(ll.ll_host, host, sizeof(ll.ll_host));
167: fd = open(lastlog, O_RDWR);
168: if (fd >= 0) {
169: lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET);
170: if (write(fd, &ll, sizeof(ll)) != sizeof(ll))
1.6 itojun 171: logit("Could not write %.100s: %.100s", lastlog, strerror(errno));
1.1 djm 172: close(fd);
173: }
174: }
175: }
176:
177: /* Records that the user has logged out. */
178: void
1.8 avsm 179: record_logout(pid_t pid, const char *tty)
1.1 djm 180: {
1.8 avsm 181: const char *line = tty + 5; /* /dev/ttyq8 -> ttyq8 */
1.1 djm 182: if (logout(line))
183: logwtmp(line, "", "");
184: }
![[BACK]](/icons/back.gif){kind=icon}
Return to sshlogin.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh