]> andersk Git - openssh.git/blame - login.c
- Merged bsd-login ttyslot and AIX utmp patch from Gert Doering
[openssh.git] / login.c
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8efc0c15 1/*
6ae2364d 2 *
5260325f 3 * login.c
6ae2364d 4 *
5260325f 5 * Author: Tatu Ylonen <ylo@cs.hut.fi>
6ae2364d 6 *
5260325f 7 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
8 * All rights reserved
6ae2364d 9 *
5260325f 10 * Created: Fri Mar 24 14:51:08 1995 ylo
6ae2364d 11 *
5260325f 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.
6ae2364d 17 *
5260325f 18 */
8efc0c15 19
20#include "includes.h"
21RCSID("$Id$");
22
92f90c57 23#if defined(HAVE_UTMPX_H) && defined(USE_UTMPX)
8946db53 24# include <utmpx.h>
25#endif
26#ifdef HAVE_UTMP_H
27# include <utmp.h>
28#endif
5260325f 29#include "ssh.h"
4cca272e 30
5260325f 31#ifdef HAVE_UTIL_H
32# include <util.h>
33#endif
4cca272e 34#ifdef HAVE_LASTLOG_H
35# include <lastlog.h>
36#endif
09041313 37#ifdef HAVE_LOGIN_H
38# include <login.h>
39#endif
4cca272e 40
aa3378df 41/*
42 * Returns the time when the user last logged in. Returns 0 if the
43 * information is not available. This must be called before record_login.
44 * The host the user logged in from will be returned in buf.
45 */
8efc0c15 46
aa3378df 47/*
48 * Returns the time when the user last logged in (or 0 if no previous login
49 * is found). The name of the host used last time is returned in buf.
50 */
8efc0c15 51
6ae2364d 52unsigned long
5260325f 53get_last_login_time(uid_t uid, const char *logname,
54 char *buf, unsigned int bufsize)
8efc0c15 55{
ae28776a 56#if defined(_PATH_LASTLOG) && !defined(DISABLE_LASTLOG)
5260325f 57 struct lastlog ll;
58 char *lastlog;
59 int fd;
76a8e733 60#ifdef LASTLOG_IS_DIR
12aa90af 61 char lbuf[1024];
76a8e733 62#endif /* LASTLOG_IS_DIR */
5260325f 63
64 lastlog = _PATH_LASTLOG;
65 buf[0] = '\0';
66
12aa90af 67#ifndef LASTLOG_IS_DIR
5260325f 68 fd = open(lastlog, O_RDONLY);
69 if (fd < 0)
70 return 0;
71 lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET);
76a8e733 72#else /* LASTLOG_IS_DIR */
12aa90af 73 snprintf(lbuf, sizeof(buf), "%s/%s", lastlog, logname);
74 fd = open(lbuf, O_RDONLY);
76a8e733 75 if (fd < 0)
76 return 0;
77#endif /* LASTLOG_IS_DIR */
5260325f 78 if (read(fd, &ll, sizeof(ll)) != sizeof(ll)) {
79 close(fd);
80 return 0;
81 }
82 close(fd);
83 if (bufsize > sizeof(ll.ll_host) + 1)
84 bufsize = sizeof(ll.ll_host) + 1;
85 strncpy(buf, ll.ll_host, bufsize - 1);
86 buf[bufsize - 1] = 0;
87 return ll.ll_time;
a7effaac 88
ae28776a 89#else /* defined(_PATH_LASTLOG) && !defined(DISABLE_LASTLOG) */
a7effaac 90 /* Look in wtmp for the last login */
91 struct utmp wt;
92 char *wt_file = _PATH_WTMP;
93 int fd1;
94 unsigned long t = 0;
95
96 if ( (fd1 = open(wt_file, O_RDONLY)) < 0 ) {
97 error("Couldn't open %.100s to find last login time.", wt_file);
98 return 0;
99 }
100
101 /* seek to last record of file */
102 lseek(fd1, (off_t)(0-sizeof(struct utmp)), SEEK_END);
103
104 /* loop through wtmp for our last user login record */
105 do {
106 if (read(fd1, &wt, sizeof(wt)) != sizeof(wt)) {
107 close(fd1);
108 return 0;
109 }
110
111 if ( wt.ut_type == USER_PROCESS) {
112 if ( !strncmp(logname, wt.ut_user, 8) ) {
113 t = (unsigned long) wt.ut_time;
ae28776a 114#ifdef HAVE_HOST_IN_UTMP
a7effaac 115 if (bufsize > sizeof(wt.ut_host) + 1)
116 bufsize = sizeof(wt.ut_host) + 1;
117 strncpy(buf, wt.ut_host, bufsize - 1);
118 buf[bufsize - 1] = 0;
ae28776a 119#else /* HAVE_HOST_IN_UTMP */
120 buf[0] = 0;
121#endif /* HAVE_HOST_IN_UTMP */
a7effaac 122 }
123 }
124
125 if (lseek(fd1, (off_t)(0-2*sizeof(struct utmp)), SEEK_CUR) == -1)
126 break;
127 } while (t == 0);
128
129 return t;
ae28776a 130#endif /* defined(_PATH_LASTLOG) && !defined(DISABLE_LASTLOG) */
8efc0c15 131}
132
aa3378df 133/*
134 * Records that the user has logged in. I these parts of operating systems
135 * were more standardized.
136 */
8efc0c15 137
6ae2364d 138void
9da5c3c9 139record_login(pid_t pid, const char *ttyname, const char *user, uid_t uid,
48e671d5 140 const char *host, struct sockaddr * addr)
8efc0c15 141{
ae28776a 142#if defined(_PATH_LASTLOG) && !defined(DISABLE_LASTLOG)
5260325f 143 struct lastlog ll;
144 char *lastlog;
76a8e733 145#ifdef LASTLOG_IS_DIR
146 char buf[1024];
147#endif /* LASTLOG_IS_DIR */
ae28776a 148#endif /* defined(_PATH_LASTLOG) && !defined(DISABLE_LASTLOG) */
f498ed15 149 struct utmp u;
150#if defined(HAVE_UTMPX_H) && defined(USE_UTMPX)
151 struct utmpx utx;
152#endif
5260325f 153
154 /* Construct an utmp/wtmp entry. */
155 memset(&u, 0, sizeof(u));
156 strncpy(u.ut_line, ttyname + 5, sizeof(u.ut_line));
c73a0cb5 157#if defined(HAVE_ID_IN_UTMP)
0d5f7abc 158#ifdef _AIX
159 strncpy(u.ut_id, ttyname + 5, sizeof(u.ut_id));
160#else /* !AIX */
21feb5fa 161 strncpy(u.ut_id, ttyname + 8, sizeof(u.ut_id));
0d5f7abc 162#endif
c73a0cb5 163#endif /* defined(HAVE_ID_IN_UTMP) */
5260325f 164 strncpy(u.ut_name, user, sizeof(u.ut_name));
70e0115b 165#if defined(HAVE_TV_IN_UTMP)
166 (void)gettimeofday(&u.ut_tv, NULL);
167#else /* defined(HAVE_TV_IN_UTMP) */
168 u.ut_time = time(NULL);
169#endif /* defined(HAVE_TV_IN_UTMP) */
170#if defined(HAVE_PID_IN_UTMP)
171 u.ut_pid = (pid_t)pid;
172#endif /* HAVE_PID_IN_UTMP */
173#if defined(HAVE_TYPE_IN_UTMP)
f498ed15 174 u.ut_type = (uid == -1)?DEAD_PROCESS:USER_PROCESS;
70e0115b 175#endif /* HAVE_TYPE_IN_UTMP */
f498ed15 176#if defined(HAVE_HOST_IN_UTMP)
5260325f 177 strncpy(u.ut_host, host, sizeof(u.ut_host));
4cca272e 178#endif
4811cc0b 179#if defined(HAVE_ADDR_IN_UTMP)
bfae20ad 180 if (addr) {
181 switch (addr->sa_family) {
182 case AF_INET: {
183 struct sockaddr_in *in = (struct sockaddr_in*)addr;
184 memcpy(&(u.ut_addr), &(in->sin_addr), sizeof(&(in->sin_addr)));
185 break;
186 }
48e671d5 187#if defined(HAVE_ADDR_V6_IN_UTMP)
bfae20ad 188 case AF_INET6: {
189 struct sockaddr_in6 *in6 = (struct sockaddr_in6*)addr;
190 memcpy(u.ut_addr_v6, &(in6->sin6_addr), sizeof(&(in6->sin6_addr)));
191 break;
192 }
48e671d5 193#endif
bfae20ad 194 default:
195 break;
196 }
48e671d5 197 }
4811cc0b 198#endif
8efc0c15 199
f498ed15 200#if defined(HAVE_UTMPX_H) && defined(USE_UTMPX)
201 memset(&utx, 0, sizeof(utx));
202 strncpy(utx.ut_user, user, sizeof(utx.ut_name));
203 strncpy(utx.ut_line, ttyname + 5, sizeof(utx.ut_line));
21feb5fa 204 strncpy(utx.ut_id, ttyname + 8, sizeof(utx.ut_id));
f498ed15 205 utx.ut_pid = (pid_t)pid;
70e0115b 206 (void)gettimeofday(&utx.ut_tv, NULL);
f74efc8d 207 utx.ut_type = (uid == -1)?DEAD_PROCESS:USER_PROCESS;
208# ifdef HAVE_HOST_IN_UTMPX
209# ifdef HAVE_SYSLEN_IN_UTMPX
f498ed15 210 utx.ut_syslen = strlen(host);
f74efc8d 211 strncpy(utx.ut_host, host, utx.ut_syslen);
212# else
f498ed15 213 strncpy(utx.ut_host, host, sizeof(utx.ut_host));
f74efc8d 214# endif /* HAVE_SYSLEN_IN_UTMPX */
215# endif
48e671d5 216#if defined(HAVE_ADDR_IN_UTMPX)
aaf2abd7 217 if (addr) {
bfae20ad 218 switch (addr->sa_family) {
219 case AF_INET: {
220 struct sockaddr_in *in = (struct sockaddr_in*)addr;
221 memcpy(&(utx.ut_addr), &(in->sin_addr), sizeof(&(in->sin_addr)));
222 break;
223 }
48e671d5 224#if defined(HAVE_ADDR_V6_IN_UTMPX)
bfae20ad 225 case AF_INET6: {
226 struct sockaddr_in6 *in6 = (struct sockaddr_in6*)addr;
227 memcpy(utx.ut_addr_v6, &(in6->sin6_addr), sizeof(&(in6->sin6_addr)));
228 break;
229 }
48e671d5 230#endif
bfae20ad 231 default:
232 break;
233 }
48e671d5 234 }
235#endif
f498ed15 236#endif /* defined(HAVE_UTMPX_H) && defined(USE_UTMPX) */
5260325f 237
f74efc8d 238/*#if defined(HAVE_UTMPX_H) && defined(USE_UTMPX) && !defined(HAVE_LOGIN)*/
239#if defined(HAVE_UTMPX_H) && defined(USE_UTMPX)
f498ed15 240 login(&u, &utx);
241#else /* defined(HAVE_UTMPX_H) && defined(USE_UTMPX) */
5260325f 242 login(&u);
f498ed15 243#endif /* defined(HAVE_UTMPX_H) && defined(USE_UTMPX) */
a7effaac 244
ae28776a 245#if defined(_PATH_LASTLOG) && !defined(DISABLE_LASTLOG)
5260325f 246 lastlog = _PATH_LASTLOG;
247
248 /* Update lastlog unless actually recording a logout. */
249 if (strcmp(user, "") != 0) {
a7effaac 250 int fd;
aa3378df 251 /*
252 * It is safer to bzero the lastlog structure first because
253 * some systems might have some extra fields in it (e.g. SGI)
254 */
5260325f 255 memset(&ll, 0, sizeof(ll));
256
257 /* Update lastlog. */
258 ll.ll_time = time(NULL);
259 strncpy(ll.ll_line, ttyname + 5, sizeof(ll.ll_line));
260 strncpy(ll.ll_host, host, sizeof(ll.ll_host));
76a8e733 261#ifdef LASTLOG_IS_DIR
9d5f374b 262 snprintf(buf, sizeof(buf), "%s/%s", lastlog, user);
76a8e733 263 fd = open(buf, O_RDWR);
264 if (fd >= 0) {
265#else /* LASTLOG_IS_DIR */
5260325f 266 fd = open(lastlog, O_RDWR);
267 if (fd >= 0) {
268 lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET);
76a8e733 269#endif /* LASTLOG_IS_DIR */
5260325f 270 if (write(fd, &ll, sizeof(ll)) != sizeof(ll))
271 log("Could not write %.100s: %.100s", lastlog, strerror(errno));
272 close(fd);
273 }
8efc0c15 274 }
ae28776a 275#endif /* defined(_PATH_LASTLOG) && !defined(DISABLE_LASTLOG) */
8efc0c15 276}
5260325f 277
278/* Records that the user has logged out. */
279
6ae2364d 280void
9da5c3c9 281record_logout(pid_t pid, const char *ttyname)
8efc0c15 282{
4cca272e 283#ifdef HAVE_LIBUTIL_LOGIN
5260325f 284 const char *line = ttyname + 5; /* /dev/ttyq8 -> ttyq8 */
285 if (logout(line))
286 logwtmp(line, "", "");
4cca272e 287#else /* HAVE_LIBUTIL_LOGIN */
5260325f 288 record_login(pid, ttyname, "", -1, "", NULL);
4cca272e 289#endif /* HAVE_LIBUTIL_LOGIN */
8efc0c15 290}
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