blob: 81bae82052a32534ccecb0c844abca17f798ef4a [file] [log] [blame]
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001/*
Damien Miller95def091999-11-25 00:26:21 +11002 *
3 * login.c
4 *
5 * Author: Tatu Ylonen <ylo@cs.hut.fi>
6 *
7 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
8 * All rights reserved
9 *
10 * Created: Fri Mar 24 14:51:08 1995 ylo
11 *
12 * This file performs some of the things login(1) normally does. We cannot
13 * easily use something like login -p -h host -f user, because there are
14 * several different logins around, and it is hard to determined what kind of
15 * login the current system has. Also, we want to be able to execute commands
16 * on a tty.
17 *
18 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100019
20#include "includes.h"
Damien Miller063fdf81999-11-25 13:08:31 +110021RCSID("$Id: login.c,v 1.5 1999/11/25 02:08:31 damien Exp $");
Damien Millerd4a8b7e1999-10-27 13:42:43 +100022
23#include <utmp.h>
Damien Miller95def091999-11-25 00:26:21 +110024#include "ssh.h"
Damien Millerab18c411999-11-11 10:40:23 +110025
Damien Miller95def091999-11-25 00:26:21 +110026#ifdef HAVE_UTIL_H
27# include <util.h>
28#endif
Damien Millerab18c411999-11-11 10:40:23 +110029#ifdef HAVE_LASTLOG_H
30# include <lastlog.h>
31#endif
Damien Miller063fdf81999-11-25 13:08:31 +110032#ifdef HAVE_LOGIN_H
33# include <login.h>
34#endif
Damien Millerab18c411999-11-11 10:40:23 +110035
Damien Miller5428f641999-11-25 11:54:57 +110036/*
37 * Returns the time when the user last logged in. Returns 0 if the
38 * information is not available. This must be called before record_login.
39 * The host the user logged in from will be returned in buf.
40 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100041
Damien Miller5428f641999-11-25 11:54:57 +110042/*
43 * Returns the time when the user last logged in (or 0 if no previous login
44 * is found). The name of the host used last time is returned in buf.
45 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100046
Damien Miller95def091999-11-25 00:26:21 +110047unsigned long
48get_last_login_time(uid_t uid, const char *logname,
49 char *buf, unsigned int bufsize)
Damien Millerd4a8b7e1999-10-27 13:42:43 +100050{
Damien Miller95def091999-11-25 00:26:21 +110051 struct lastlog ll;
52 char *lastlog;
53 int fd;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100054
Damien Miller95def091999-11-25 00:26:21 +110055 lastlog = _PATH_LASTLOG;
56 buf[0] = '\0';
Damien Millerd4a8b7e1999-10-27 13:42:43 +100057
Damien Miller95def091999-11-25 00:26:21 +110058 fd = open(lastlog, O_RDONLY);
59 if (fd < 0)
60 return 0;
61 lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET);
62 if (read(fd, &ll, sizeof(ll)) != sizeof(ll)) {
63 close(fd);
64 return 0;
65 }
66 close(fd);
67 if (bufsize > sizeof(ll.ll_host) + 1)
68 bufsize = sizeof(ll.ll_host) + 1;
69 strncpy(buf, ll.ll_host, bufsize - 1);
70 buf[bufsize - 1] = 0;
71 return ll.ll_time;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100072}
73
Damien Miller5428f641999-11-25 11:54:57 +110074/*
75 * Records that the user has logged in. I these parts of operating systems
76 * were more standardized.
77 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100078
Damien Miller95def091999-11-25 00:26:21 +110079void
80record_login(int pid, const char *ttyname, const char *user, uid_t uid,
81 const char *host, struct sockaddr_in * addr)
Damien Millerd4a8b7e1999-10-27 13:42:43 +100082{
Damien Miller95def091999-11-25 00:26:21 +110083 int fd;
84 struct lastlog ll;
85 char *lastlog;
86 struct utmp u;
87 const char *utmp, *wtmp;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100088
Damien Miller95def091999-11-25 00:26:21 +110089 /* Construct an utmp/wtmp entry. */
90 memset(&u, 0, sizeof(u));
91 strncpy(u.ut_line, ttyname + 5, sizeof(u.ut_line));
92 u.ut_time = time(NULL);
93 strncpy(u.ut_name, user, sizeof(u.ut_name));
Damien Millerab18c411999-11-11 10:40:23 +110094#ifdef HAVE_HOST_IN_UTMP
Damien Miller95def091999-11-25 00:26:21 +110095 strncpy(u.ut_host, host, sizeof(u.ut_host));
Damien Millerab18c411999-11-11 10:40:23 +110096#endif
Damien Millerd4a8b7e1999-10-27 13:42:43 +100097
Damien Miller95def091999-11-25 00:26:21 +110098 /* Figure out the file names. */
99 utmp = _PATH_UTMP;
100 wtmp = _PATH_WTMP;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000101
Damien Miller95def091999-11-25 00:26:21 +1100102 login(&u);
103 lastlog = _PATH_LASTLOG;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000104
Damien Miller95def091999-11-25 00:26:21 +1100105 /* Update lastlog unless actually recording a logout. */
106 if (strcmp(user, "") != 0) {
Damien Miller5428f641999-11-25 11:54:57 +1100107 /*
108 * It is safer to bzero the lastlog structure first because
109 * some systems might have some extra fields in it (e.g. SGI)
110 */
Damien Miller95def091999-11-25 00:26:21 +1100111 memset(&ll, 0, sizeof(ll));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000112
Damien Miller95def091999-11-25 00:26:21 +1100113 /* Update lastlog. */
114 ll.ll_time = time(NULL);
115 strncpy(ll.ll_line, ttyname + 5, sizeof(ll.ll_line));
116 strncpy(ll.ll_host, host, sizeof(ll.ll_host));
117 fd = open(lastlog, O_RDWR);
118 if (fd >= 0) {
119 lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET);
120 if (write(fd, &ll, sizeof(ll)) != sizeof(ll))
121 log("Could not write %.100s: %.100s", lastlog, strerror(errno));
122 close(fd);
123 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000124 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000125}
Damien Miller95def091999-11-25 00:26:21 +1100126
127/* Records that the user has logged out. */
128
129void
130record_logout(int pid, const char *ttyname)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000131{
Damien Millerab18c411999-11-11 10:40:23 +1100132#ifdef HAVE_LIBUTIL_LOGIN
Damien Miller95def091999-11-25 00:26:21 +1100133 const char *line = ttyname + 5; /* /dev/ttyq8 -> ttyq8 */
134 if (logout(line))
135 logwtmp(line, "", "");
Damien Millerab18c411999-11-11 10:40:23 +1100136#else /* HAVE_LIBUTIL_LOGIN */
Damien Miller95def091999-11-25 00:26:21 +1100137 record_login(pid, ttyname, "", -1, "", NULL);
Damien Millerab18c411999-11-11 10:40:23 +1100138#endif /* HAVE_LIBUTIL_LOGIN */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000139}