Annotation of src/usr.bin/ssh/sshlogin.c, Revision 1.14
1.1 djm 1: /*
2: * Author: Tatu Ylonen <ylo@cs.hut.fi>
3: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4: * All rights reserved
5: * This file performs some of the things login(1) normally does. We cannot
6: * easily use something like login -p -h host -f user, because there are
7: * several different logins around, and it is hard to determined what kind of
8: * login the current system has. Also, we want to be able to execute commands
9: * on a tty.
10: *
11: * As far as I am concerned, the code I have written for this software
12: * can be used freely for any purpose. Any derived versions of this
13: * software must be clearly marked as such, and if the derived work is
14: * incompatible with the protocol description in the RFC file, it must be
15: * called by a name other than "ssh" or "Secure Shell".
16: *
17: * Copyright (c) 1999 Theo de Raadt. All rights reserved.
18: * Copyright (c) 1999 Markus Friedl. All rights reserved.
19: *
20: * Redistribution and use in source and binary forms, with or without
21: * modification, are permitted provided that the following conditions
22: * are met:
23: * 1. Redistributions of source code must retain the above copyright
24: * notice, this list of conditions and the following disclaimer.
25: * 2. Redistributions in binary form must reproduce the above copyright
26: * notice, this list of conditions and the following disclaimer in the
27: * documentation and/or other materials provided with the distribution.
28: *
29: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
30: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
31: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
32: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
33: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
34: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
38: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39: */
40:
41: #include "includes.h"
42:
43: #include <util.h>
44: #include <utmp.h>
45: #include "sshlogin.h"
46: #include "log.h"
1.10 dtucker 47: #include "buffer.h"
48: #include "servconf.h"
49:
50: extern Buffer loginmsg;
51: extern ServerOptions options;
1.1 djm 52:
53: /*
54: * Returns the time when the user last logged in. Returns 0 if the
55: * information is not available. This must be called before record_login.
56: * The host the user logged in from will be returned in buf.
57: */
58: u_long
59: get_last_login_time(uid_t uid, const char *logname,
1.4 deraadt 60: char *buf, u_int bufsize)
1.1 djm 61: {
62: struct lastlog ll;
63: char *lastlog;
64: int fd;
1.11 djm 65: off_t pos, r;
1.1 djm 66:
67: lastlog = _PATH_LASTLOG;
68: buf[0] = '\0';
69:
70: fd = open(lastlog, O_RDONLY);
71: if (fd < 0)
72: return 0;
1.11 djm 73:
74: pos = (long) uid * sizeof(ll);
75: r = lseek(fd, pos, SEEK_SET);
76: if (r == -1) {
1.13 djm 77: error("%s: lseek: %s", __func__, strerror(errno));
1.11 djm 78: return (0);
79: }
80: if (r != pos) {
81: debug("%s: truncated lastlog", __func__);
82: return (0);
83: }
1.1 djm 84: if (read(fd, &ll, sizeof(ll)) != sizeof(ll)) {
85: close(fd);
86: return 0;
87: }
88: close(fd);
89: if (bufsize > sizeof(ll.ll_host) + 1)
90: bufsize = sizeof(ll.ll_host) + 1;
91: strncpy(buf, ll.ll_host, bufsize - 1);
1.9 dtucker 92: buf[bufsize - 1] = '\0';
1.1 djm 93: return ll.ll_time;
94: }
95:
96: /*
1.10 dtucker 97: * Generate and store last login message. This must be done before
98: * login_login() is called and lastlog is updated.
99: */
1.12 djm 100: static void
1.10 dtucker 101: store_lastlog_message(const char *user, uid_t uid)
102: {
103: char *time_string, hostname[MAXHOSTNAMELEN] = "", buf[512];
104: time_t last_login_time;
105:
106: if (!options.print_lastlog)
107: return;
108:
109: last_login_time = get_last_login_time(uid, user, hostname,
110: sizeof(hostname));
111:
112: if (last_login_time != 0) {
113: time_string = ctime(&last_login_time);
114: if (strchr(time_string, '\n'))
115: *strchr(time_string, '\n') = '\0';
116: if (strcmp(hostname, "") == 0)
117: snprintf(buf, sizeof(buf), "Last login: %s\r\n",
118: time_string);
119: else
120: snprintf(buf, sizeof(buf), "Last login: %s from %s\r\n",
121: time_string, hostname);
122: buffer_append(&loginmsg, buf, strlen(buf));
123: }
124: }
125:
126: /*
1.7 markus 127: * Records that the user has logged in. I wish these parts of operating
128: * systems were more standardized.
1.1 djm 129: */
130: void
1.8 avsm 131: record_login(pid_t pid, const char *tty, const char *user, uid_t uid,
1.5 stevesk 132: const char *host, struct sockaddr * addr, socklen_t addrlen)
1.1 djm 133: {
134: int fd;
135: struct lastlog ll;
136: char *lastlog;
137: struct utmp u;
1.10 dtucker 138:
139: /* save previous login details before writing new */
140: store_lastlog_message(user, uid);
1.1 djm 141:
142: /* Construct an utmp/wtmp entry. */
143: memset(&u, 0, sizeof(u));
1.8 avsm 144: strncpy(u.ut_line, tty + 5, sizeof(u.ut_line));
1.1 djm 145: u.ut_time = time(NULL);
146: strncpy(u.ut_name, user, sizeof(u.ut_name));
147: strncpy(u.ut_host, host, sizeof(u.ut_host));
148:
149: login(&u);
150: lastlog = _PATH_LASTLOG;
151:
152: /* Update lastlog unless actually recording a logout. */
153: if (strcmp(user, "") != 0) {
154: /*
155: * It is safer to bzero the lastlog structure first because
156: * some systems might have some extra fields in it (e.g. SGI)
157: */
158: memset(&ll, 0, sizeof(ll));
159:
160: /* Update lastlog. */
161: ll.ll_time = time(NULL);
1.8 avsm 162: strncpy(ll.ll_line, tty + 5, sizeof(ll.ll_line));
1.1 djm 163: strncpy(ll.ll_host, host, sizeof(ll.ll_host));
164: fd = open(lastlog, O_RDWR);
165: if (fd >= 0) {
166: lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET);
167: if (write(fd, &ll, sizeof(ll)) != sizeof(ll))
1.6 itojun 168: logit("Could not write %.100s: %.100s", lastlog, strerror(errno));
1.1 djm 169: close(fd);
170: }
171: }
172: }
173:
174: /* Records that the user has logged out. */
175: void
1.8 avsm 176: record_logout(pid_t pid, const char *tty)
1.1 djm 177: {
1.8 avsm 178: const char *line = tty + 5; /* /dev/ttyq8 -> ttyq8 */
1.1 djm 179: if (logout(line))
180: logwtmp(line, "", "");
181: }
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