Annotation of src/usr.bin/ssh/sshlogin.c, Revision 1.13.6.1
1.13.6.1! brad 1: /* $OpenBSD: sshlogin.c,v 1.25 2006/08/03 03:34:42 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:
1.13.6.1! brad 42: #include <sys/types.h>
! 43: #include <sys/param.h>
! 44: #include <sys/socket.h>
! 45:
! 46: #include <errno.h>
! 47: #include <fcntl.h>
! 48: #include <stdio.h>
! 49: #include <string.h>
! 50: #include <time.h>
! 51: #include <unistd.h>
1.1 djm 52: #include <util.h>
53: #include <utmp.h>
1.13.6.1! brad 54: #include <stdarg.h>
! 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: */
1.13.6.1! brad 69: time_t
1.1 djm 70: get_last_login_time(uid_t uid, const char *logname,
1.13.6.1! brad 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));
1.11 djm 89: return (0);
90: }
91: if (r != pos) {
92: debug("%s: truncated lastlog", __func__);
93: return (0);
94: }
1.1 djm 95: if (read(fd, &ll, sizeof(ll)) != sizeof(ll)) {
96: close(fd);
97: return 0;
98: }
99: close(fd);
100: if (bufsize > sizeof(ll.ll_host) + 1)
101: bufsize = sizeof(ll.ll_host) + 1;
102: strncpy(buf, ll.ll_host, bufsize - 1);
1.9 dtucker 103: buf[bufsize - 1] = '\0';
1.13.6.1! brad 104: return (time_t)ll.ll_time;
1.1 djm 105: }
106:
107: /*
1.10 dtucker 108: * Generate and store last login message. This must be done before
109: * login_login() is called and lastlog is updated.
110: */
1.12 djm 111: static void
1.10 dtucker 112: store_lastlog_message(const char *user, uid_t uid)
113: {
114: char *time_string, hostname[MAXHOSTNAMELEN] = "", buf[512];
115: time_t last_login_time;
116:
117: if (!options.print_lastlog)
118: return;
119:
120: last_login_time = get_last_login_time(uid, user, hostname,
121: sizeof(hostname));
122:
123: if (last_login_time != 0) {
124: time_string = ctime(&last_login_time);
125: if (strchr(time_string, '\n'))
126: *strchr(time_string, '\n') = '\0';
127: if (strcmp(hostname, "") == 0)
128: snprintf(buf, sizeof(buf), "Last login: %s\r\n",
129: time_string);
130: else
131: snprintf(buf, sizeof(buf), "Last login: %s from %s\r\n",
132: time_string, hostname);
133: buffer_append(&loginmsg, buf, strlen(buf));
134: }
135: }
136:
137: /*
1.7 markus 138: * Records that the user has logged in. I wish these parts of operating
139: * systems were more standardized.
1.1 djm 140: */
141: void
1.8 avsm 142: record_login(pid_t pid, const char *tty, const char *user, uid_t uid,
1.13.6.1! brad 143: const char *host, struct sockaddr *addr, socklen_t addrlen)
1.1 djm 144: {
145: int fd;
146: struct lastlog ll;
147: char *lastlog;
148: struct utmp u;
1.10 dtucker 149:
150: /* save previous login details before writing new */
151: store_lastlog_message(user, uid);
1.1 djm 152:
153: /* Construct an utmp/wtmp entry. */
154: memset(&u, 0, sizeof(u));
1.8 avsm 155: strncpy(u.ut_line, tty + 5, sizeof(u.ut_line));
1.1 djm 156: u.ut_time = time(NULL);
157: strncpy(u.ut_name, user, sizeof(u.ut_name));
158: strncpy(u.ut_host, host, sizeof(u.ut_host));
159:
160: login(&u);
161: lastlog = _PATH_LASTLOG;
162:
163: /* Update lastlog unless actually recording a logout. */
164: if (strcmp(user, "") != 0) {
165: /*
166: * It is safer to bzero the lastlog structure first because
167: * some systems might have some extra fields in it (e.g. SGI)
168: */
169: memset(&ll, 0, sizeof(ll));
170:
171: /* Update lastlog. */
172: ll.ll_time = time(NULL);
1.8 avsm 173: strncpy(ll.ll_line, tty + 5, sizeof(ll.ll_line));
1.1 djm 174: strncpy(ll.ll_host, host, sizeof(ll.ll_host));
175: fd = open(lastlog, O_RDWR);
176: if (fd >= 0) {
177: lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET);
178: if (write(fd, &ll, sizeof(ll)) != sizeof(ll))
1.6 itojun 179: logit("Could not write %.100s: %.100s", lastlog, strerror(errno));
1.1 djm 180: close(fd);
181: }
182: }
183: }
184:
185: /* Records that the user has logged out. */
186: void
1.8 avsm 187: record_logout(pid_t pid, const char *tty)
1.1 djm 188: {
1.8 avsm 189: const char *line = tty + 5; /* /dev/ttyq8 -> ttyq8 */
1.1 djm 190: if (logout(line))
191: logwtmp(line, "", "");
192: }
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