1/*
2 * Copyright (c) 2000 Andre Lucas. All rights reserved.
3 * Portions copyright (c) 1998 Todd C. Miller
4 * Portions copyright (c) 1996 Jason Downs
5 * Portions copyright (c) 1996 Theo de Raadt
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28/**
29 ** loginrec.c: platform-independent login recording and lastlog retrieval
30 **/
31
32/*
33 The new login code explained
34 ============================
35
36 This code attempts to provide a common interface to login recording
37 (utmp and friends) and last login time retrieval.
38
39 Its primary means of achieving this is to use 'struct logininfo', a
40 union of all the useful fields in the various different types of
41 system login record structures one finds on UNIX variants.
42
43 We depend on autoconf to define which recording methods are to be
44 used, and which fields are contained in the relevant data structures
45 on the local system. Many C preprocessor symbols affect which code
46 gets compiled here.
47
48 The code is designed to make it easy to modify a particular
49 recording method, without affecting other methods nor requiring so
50 many nested conditional compilation blocks as were commonplace in
51 the old code.
52
53 For login recording, we try to use the local system's libraries as
54 these are clearly most likely to work correctly. For utmp systems
55 this usually means login() and logout() or setutent() etc., probably
56 in libutil, along with logwtmp() etc. On these systems, we fall back
57 to writing the files directly if we have to, though this method
58 requires very thorough testing so we do not corrupt local auditing
59 information. These files and their access methods are very system
60 specific indeed.
61
62 For utmpx systems, the corresponding library functions are
63 setutxent() etc. To the author's knowledge, all utmpx systems have
64 these library functions and so no direct write is attempted. If such
65 a system exists and needs support, direct analogues of the [uw]tmp
66 code should suffice.
67
68 Retrieving the time of last login ('lastlog') is in some ways even
69 more problemmatic than login recording. Some systems provide a
70 simple table of all users which we seek based on uid and retrieve a
71 relatively standard structure. Others record the same information in
72 a directory with a separate file, and others don't record the
73 information separately at all. For systems in the latter category,
74 we look backwards in the wtmp or wtmpx file for the last login entry
75 for our user. Naturally this is slower and on busy systems could
76 incur a significant performance penalty.
77
78 Calling the new code
79 --------------------
80
81 In OpenSSH all login recording and retrieval is performed in
82 login.c. Here you'll find working examples. Also, in the logintest.c
83 program there are more examples.
84
85 Internal handler calling method
86 -------------------------------
87
88 When a call is made to login_login() or login_logout(), both
89 routines set a struct logininfo flag defining which action (log in,
90 or log out) is to be taken. They both then call login_write(), which
91 calls whichever of the many structure-specific handlers autoconf
92 selects for the local system.
93
94 The handlers themselves handle system data structure specifics. Both
95 struct utmp and struct utmpx have utility functions (see
96 construct_utmp*()) to try to make it simpler to add extra systems
97 that introduce new features to either structure.
98
99 While it may seem terribly wasteful to replicate so much similar
100 code for each method, experience has shown that maintaining code to
101 write both struct utmp and utmpx in one function, whilst maintaining
102 support for all systems whether they have library support or not, is
103 a difficult and time-consuming task.
104
105 Lastlog support proceeds similarly. Functions login_get_lastlog()
106 (and its OpenSSH-tuned friend login_get_lastlog_time()) call
107 getlast_entry(), which tries one of three methods to find the last
108 login time. It uses local system lastlog support if it can,
109 otherwise it tries wtmp or wtmpx before giving up and returning 0,
110 meaning "tilt".
111
112 Maintenance
113 -----------
114
115 In many cases it's possible to tweak autoconf to select the correct
116 methods for a particular platform, either by improving the detection
117 code (best), or by presetting DISABLE_<method> or CONF_<method>_FILE
118 symbols for the platform.
119
120 Use logintest to check which symbols are defined before modifying
121 configure.ac and loginrec.c. (You have to build logintest yourself
122 with 'make logintest' as it's not built by default.)
123
124 Otherwise, patches to the specific method(s) are very helpful!
125
126*/
127
128/**
129 ** TODO:
130 ** homegrown ttyslot()
131 ** test, test, test
132 **
133 ** Platform status:
134 ** ----------------
135 **
136 ** Known good:
137 ** Linux (Redhat 6.2, Debian)
138 ** Solaris
139 ** HP-UX 10.20 (gcc only)
140 ** IRIX
141 ** NeXT - M68k/HPPA/Sparc (4.2/3.3)
142 **
143 ** Testing required: Please send reports!
144 ** NetBSD
145 ** HP-UX 11
146 ** AIX
147 **
148 ** Platforms with known problems:
149 ** Some variants of Slackware Linux
150 **
151 **/
152
153#include "includes.h"
154
155#include "ssh.h"
156#include "xmalloc.h"
157#include "loginrec.h"
158#include "log.h"
159#include "atomicio.h"
160
| 1/*
2 * Copyright (c) 2000 Andre Lucas. All rights reserved.
3 * Portions copyright (c) 1998 Todd C. Miller
4 * Portions copyright (c) 1996 Jason Downs
5 * Portions copyright (c) 1996 Theo de Raadt
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28/**
29 ** loginrec.c: platform-independent login recording and lastlog retrieval
30 **/
31
32/*
33 The new login code explained
34 ============================
35
36 This code attempts to provide a common interface to login recording
37 (utmp and friends) and last login time retrieval.
38
39 Its primary means of achieving this is to use 'struct logininfo', a
40 union of all the useful fields in the various different types of
41 system login record structures one finds on UNIX variants.
42
43 We depend on autoconf to define which recording methods are to be
44 used, and which fields are contained in the relevant data structures
45 on the local system. Many C preprocessor symbols affect which code
46 gets compiled here.
47
48 The code is designed to make it easy to modify a particular
49 recording method, without affecting other methods nor requiring so
50 many nested conditional compilation blocks as were commonplace in
51 the old code.
52
53 For login recording, we try to use the local system's libraries as
54 these are clearly most likely to work correctly. For utmp systems
55 this usually means login() and logout() or setutent() etc., probably
56 in libutil, along with logwtmp() etc. On these systems, we fall back
57 to writing the files directly if we have to, though this method
58 requires very thorough testing so we do not corrupt local auditing
59 information. These files and their access methods are very system
60 specific indeed.
61
62 For utmpx systems, the corresponding library functions are
63 setutxent() etc. To the author's knowledge, all utmpx systems have
64 these library functions and so no direct write is attempted. If such
65 a system exists and needs support, direct analogues of the [uw]tmp
66 code should suffice.
67
68 Retrieving the time of last login ('lastlog') is in some ways even
69 more problemmatic than login recording. Some systems provide a
70 simple table of all users which we seek based on uid and retrieve a
71 relatively standard structure. Others record the same information in
72 a directory with a separate file, and others don't record the
73 information separately at all. For systems in the latter category,
74 we look backwards in the wtmp or wtmpx file for the last login entry
75 for our user. Naturally this is slower and on busy systems could
76 incur a significant performance penalty.
77
78 Calling the new code
79 --------------------
80
81 In OpenSSH all login recording and retrieval is performed in
82 login.c. Here you'll find working examples. Also, in the logintest.c
83 program there are more examples.
84
85 Internal handler calling method
86 -------------------------------
87
88 When a call is made to login_login() or login_logout(), both
89 routines set a struct logininfo flag defining which action (log in,
90 or log out) is to be taken. They both then call login_write(), which
91 calls whichever of the many structure-specific handlers autoconf
92 selects for the local system.
93
94 The handlers themselves handle system data structure specifics. Both
95 struct utmp and struct utmpx have utility functions (see
96 construct_utmp*()) to try to make it simpler to add extra systems
97 that introduce new features to either structure.
98
99 While it may seem terribly wasteful to replicate so much similar
100 code for each method, experience has shown that maintaining code to
101 write both struct utmp and utmpx in one function, whilst maintaining
102 support for all systems whether they have library support or not, is
103 a difficult and time-consuming task.
104
105 Lastlog support proceeds similarly. Functions login_get_lastlog()
106 (and its OpenSSH-tuned friend login_get_lastlog_time()) call
107 getlast_entry(), which tries one of three methods to find the last
108 login time. It uses local system lastlog support if it can,
109 otherwise it tries wtmp or wtmpx before giving up and returning 0,
110 meaning "tilt".
111
112 Maintenance
113 -----------
114
115 In many cases it's possible to tweak autoconf to select the correct
116 methods for a particular platform, either by improving the detection
117 code (best), or by presetting DISABLE_<method> or CONF_<method>_FILE
118 symbols for the platform.
119
120 Use logintest to check which symbols are defined before modifying
121 configure.ac and loginrec.c. (You have to build logintest yourself
122 with 'make logintest' as it's not built by default.)
123
124 Otherwise, patches to the specific method(s) are very helpful!
125
126*/
127
128/**
129 ** TODO:
130 ** homegrown ttyslot()
131 ** test, test, test
132 **
133 ** Platform status:
134 ** ----------------
135 **
136 ** Known good:
137 ** Linux (Redhat 6.2, Debian)
138 ** Solaris
139 ** HP-UX 10.20 (gcc only)
140 ** IRIX
141 ** NeXT - M68k/HPPA/Sparc (4.2/3.3)
142 **
143 ** Testing required: Please send reports!
144 ** NetBSD
145 ** HP-UX 11
146 ** AIX
147 **
148 ** Platforms with known problems:
149 ** Some variants of Slackware Linux
150 **
151 **/
152
153#include "includes.h"
154
155#include "ssh.h"
156#include "xmalloc.h"
157#include "loginrec.h"
158#include "log.h"
159#include "atomicio.h"
160
|
161RCSID("$FreeBSD: head/crypto/openssh/loginrec.c 128460 2004-04-20 09:46:41Z des $");
162RCSID("$Id: loginrec.c,v 1.54 2004/02/10 05:49:35 dtucker Exp $");
| 161RCSID("$Id: loginrec.c,v 1.58 2004/08/15 09:12:52 djm Exp $");
162RCSID("$FreeBSD: head/crypto/openssh/loginrec.c 137019 2004-10-28 16:11:31Z des $");
|
163
164#ifdef HAVE_UTIL_H
165# include <util.h>
166#endif
167
168#ifdef HAVE_LIBUTIL_H
169# include <libutil.h>
170#endif
171
172/**
173 ** prototypes for helper functions in this file
174 **/
175
176#if HAVE_UTMP_H
177void set_utmp_time(struct logininfo *li, struct utmp *ut);
178void construct_utmp(struct logininfo *li, struct utmp *ut);
179#endif
180
181#ifdef HAVE_UTMPX_H
182void set_utmpx_time(struct logininfo *li, struct utmpx *ut);
183void construct_utmpx(struct logininfo *li, struct utmpx *ut);
184#endif
185
186int utmp_write_entry(struct logininfo *li);
187int utmpx_write_entry(struct logininfo *li);
188int wtmp_write_entry(struct logininfo *li);
189int wtmpx_write_entry(struct logininfo *li);
190int lastlog_write_entry(struct logininfo *li);
191int syslogin_write_entry(struct logininfo *li);
192
193int getlast_entry(struct logininfo *li);
194int lastlog_get_entry(struct logininfo *li);
195int wtmp_get_entry(struct logininfo *li);
196int wtmpx_get_entry(struct logininfo *li);
197
198/* pick the shortest string */
199#define MIN_SIZEOF(s1,s2) ( sizeof(s1) < sizeof(s2) ? sizeof(s1) : sizeof(s2) )
200
201/**
202 ** platform-independent login functions
203 **/
204
205/* login_login(struct logininfo *) -Record a login
206 *
207 * Call with a pointer to a struct logininfo initialised with
208 * login_init_entry() or login_alloc_entry()
209 *
210 * Returns:
211 * >0 if successful
212 * 0 on failure (will use OpenSSH's logging facilities for diagnostics)
213 */
214int
215login_login (struct logininfo *li)
216{
217 li->type = LTYPE_LOGIN;
218 return login_write(li);
219}
220
221
222/* login_logout(struct logininfo *) - Record a logout
223 *
224 * Call as with login_login()
225 *
226 * Returns:
227 * >0 if successful
228 * 0 on failure (will use OpenSSH's logging facilities for diagnostics)
229 */
230int
231login_logout(struct logininfo *li)
232{
233 li->type = LTYPE_LOGOUT;
234 return login_write(li);
235}
236
237/* login_get_lastlog_time(int) - Retrieve the last login time
238 *
239 * Retrieve the last login time for the given uid. Will try to use the
240 * system lastlog facilities if they are available, but will fall back
241 * to looking in wtmp/wtmpx if necessary
242 *
243 * Returns:
244 * 0 on failure, or if user has never logged in
245 * Time in seconds from the epoch if successful
246 *
247 * Useful preprocessor symbols:
248 * DISABLE_LASTLOG: If set, *never* even try to retrieve lastlog
249 * info
250 * USE_LASTLOG: If set, indicates the presence of system lastlog
251 * facilities. If this and DISABLE_LASTLOG are not set,
252 * try to retrieve lastlog information from wtmp/wtmpx.
253 */
254unsigned int
255login_get_lastlog_time(const int uid)
256{
257 struct logininfo li;
258
259 if (login_get_lastlog(&li, uid))
260 return li.tv_sec;
261 else
262 return 0;
263}
264
265/* login_get_lastlog(struct logininfo *, int) - Retrieve a lastlog entry
266 *
267 * Retrieve a logininfo structure populated (only partially) with
268 * information from the system lastlog data, or from wtmp/wtmpx if no
269 * system lastlog information exists.
270 *
271 * Note this routine must be given a pre-allocated logininfo.
272 *
273 * Returns:
274 * >0: A pointer to your struct logininfo if successful
275 * 0 on failure (will use OpenSSH's logging facilities for diagnostics)
276 *
277 */
278struct logininfo *
279login_get_lastlog(struct logininfo *li, const int uid)
280{
281 struct passwd *pw;
282
283 memset(li, '\0', sizeof(*li));
284 li->uid = uid;
285
286 /*
287 * If we don't have a 'real' lastlog, we need the username to
288 * reliably search wtmp(x) for the last login (see
289 * wtmp_get_entry().)
290 */
291 pw = getpwuid(uid);
292 if (pw == NULL)
293 fatal("login_get_lastlog: Cannot find account for uid %i", uid);
294
295 /* No MIN_SIZEOF here - we absolutely *must not* truncate the
296 * username */
297 strlcpy(li->username, pw->pw_name, sizeof(li->username));
298
299 if (getlast_entry(li))
300 return li;
301 else
302 return NULL;
303}
304
305
306/* login_alloc_entry(int, char*, char*, char*) - Allocate and initialise
307 * a logininfo structure
308 *
309 * This function creates a new struct logininfo, a data structure
310 * meant to carry the information required to portably record login info.
311 *
312 * Returns a pointer to a newly created struct logininfo. If memory
313 * allocation fails, the program halts.
314 */
315struct
316logininfo *login_alloc_entry(int pid, const char *username,
317 const char *hostname, const char *line)
318{
319 struct logininfo *newli;
320
321 newli = (struct logininfo *) xmalloc (sizeof(*newli));
322 (void)login_init_entry(newli, pid, username, hostname, line);
323 return newli;
324}
325
326
327/* login_free_entry(struct logininfo *) - free struct memory */
328void
329login_free_entry(struct logininfo *li)
330{
331 xfree(li);
332}
333
334
335/* login_init_entry(struct logininfo *, int, char*, char*, char*)
336 * - initialise a struct logininfo
337 *
338 * Populates a new struct logininfo, a data structure meant to carry
339 * the information required to portably record login info.
340 *
341 * Returns: 1
342 */
343int
344login_init_entry(struct logininfo *li, int pid, const char *username,
345 const char *hostname, const char *line)
346{
347 struct passwd *pw;
348
349 memset(li, 0, sizeof(*li));
350
351 li->pid = pid;
352
353 /* set the line information */
354 if (line)
355 line_fullname(li->line, line, sizeof(li->line));
356
357 if (username) {
358 strlcpy(li->username, username, sizeof(li->username));
359 pw = getpwnam(li->username);
360 if (pw == NULL)
361 fatal("login_init_entry: Cannot find user \"%s\"", li->username);
362 li->uid = pw->pw_uid;
363 }
364
365 if (hostname)
366 strlcpy(li->hostname, hostname, sizeof(li->hostname));
367
368 return 1;
369}
370
371/* login_set_current_time(struct logininfo *) - set the current time
372 *
373 * Set the current time in a logininfo structure. This function is
374 * meant to eliminate the need to deal with system dependencies for
375 * time handling.
376 */
377void
378login_set_current_time(struct logininfo *li)
379{
380 struct timeval tv;
381
382 gettimeofday(&tv, NULL);
383
384 li->tv_sec = tv.tv_sec;
385 li->tv_usec = tv.tv_usec;
386}
387
388/* copy a sockaddr_* into our logininfo */
389void
390login_set_addr(struct logininfo *li, const struct sockaddr *sa,
391 const unsigned int sa_size)
392{
393 unsigned int bufsize = sa_size;
394
395 /* make sure we don't overrun our union */
396 if (sizeof(li->hostaddr) < sa_size)
397 bufsize = sizeof(li->hostaddr);
398
399 memcpy((void *)&(li->hostaddr.sa), (const void *)sa, bufsize);
400}
401
402
403/**
404 ** login_write: Call low-level recording functions based on autoconf
405 ** results
406 **/
407int
408login_write (struct logininfo *li)
409{
410#ifndef HAVE_CYGWIN
411 if ((int)geteuid() != 0) {
412 logit("Attempt to write login records by non-root user (aborting)");
413 return 1;
414 }
415#endif
416
417 /* set the timestamp */
418 login_set_current_time(li);
419#ifdef USE_LOGIN
420 syslogin_write_entry(li);
421#endif
422#ifdef USE_LASTLOG
423 if (li->type == LTYPE_LOGIN) {
424 lastlog_write_entry(li);
425 }
426#endif
427#ifdef USE_UTMP
428 utmp_write_entry(li);
429#endif
430#ifdef USE_WTMP
431 wtmp_write_entry(li);
432#endif
433#ifdef USE_UTMPX
434 utmpx_write_entry(li);
435#endif
436#ifdef USE_WTMPX
437 wtmpx_write_entry(li);
438#endif
| 163
164#ifdef HAVE_UTIL_H
165# include <util.h>
166#endif
167
168#ifdef HAVE_LIBUTIL_H
169# include <libutil.h>
170#endif
171
172/**
173 ** prototypes for helper functions in this file
174 **/
175
176#if HAVE_UTMP_H
177void set_utmp_time(struct logininfo *li, struct utmp *ut);
178void construct_utmp(struct logininfo *li, struct utmp *ut);
179#endif
180
181#ifdef HAVE_UTMPX_H
182void set_utmpx_time(struct logininfo *li, struct utmpx *ut);
183void construct_utmpx(struct logininfo *li, struct utmpx *ut);
184#endif
185
186int utmp_write_entry(struct logininfo *li);
187int utmpx_write_entry(struct logininfo *li);
188int wtmp_write_entry(struct logininfo *li);
189int wtmpx_write_entry(struct logininfo *li);
190int lastlog_write_entry(struct logininfo *li);
191int syslogin_write_entry(struct logininfo *li);
192
193int getlast_entry(struct logininfo *li);
194int lastlog_get_entry(struct logininfo *li);
195int wtmp_get_entry(struct logininfo *li);
196int wtmpx_get_entry(struct logininfo *li);
197
198/* pick the shortest string */
199#define MIN_SIZEOF(s1,s2) ( sizeof(s1) < sizeof(s2) ? sizeof(s1) : sizeof(s2) )
200
201/**
202 ** platform-independent login functions
203 **/
204
205/* login_login(struct logininfo *) -Record a login
206 *
207 * Call with a pointer to a struct logininfo initialised with
208 * login_init_entry() or login_alloc_entry()
209 *
210 * Returns:
211 * >0 if successful
212 * 0 on failure (will use OpenSSH's logging facilities for diagnostics)
213 */
214int
215login_login (struct logininfo *li)
216{
217 li->type = LTYPE_LOGIN;
218 return login_write(li);
219}
220
221
222/* login_logout(struct logininfo *) - Record a logout
223 *
224 * Call as with login_login()
225 *
226 * Returns:
227 * >0 if successful
228 * 0 on failure (will use OpenSSH's logging facilities for diagnostics)
229 */
230int
231login_logout(struct logininfo *li)
232{
233 li->type = LTYPE_LOGOUT;
234 return login_write(li);
235}
236
237/* login_get_lastlog_time(int) - Retrieve the last login time
238 *
239 * Retrieve the last login time for the given uid. Will try to use the
240 * system lastlog facilities if they are available, but will fall back
241 * to looking in wtmp/wtmpx if necessary
242 *
243 * Returns:
244 * 0 on failure, or if user has never logged in
245 * Time in seconds from the epoch if successful
246 *
247 * Useful preprocessor symbols:
248 * DISABLE_LASTLOG: If set, *never* even try to retrieve lastlog
249 * info
250 * USE_LASTLOG: If set, indicates the presence of system lastlog
251 * facilities. If this and DISABLE_LASTLOG are not set,
252 * try to retrieve lastlog information from wtmp/wtmpx.
253 */
254unsigned int
255login_get_lastlog_time(const int uid)
256{
257 struct logininfo li;
258
259 if (login_get_lastlog(&li, uid))
260 return li.tv_sec;
261 else
262 return 0;
263}
264
265/* login_get_lastlog(struct logininfo *, int) - Retrieve a lastlog entry
266 *
267 * Retrieve a logininfo structure populated (only partially) with
268 * information from the system lastlog data, or from wtmp/wtmpx if no
269 * system lastlog information exists.
270 *
271 * Note this routine must be given a pre-allocated logininfo.
272 *
273 * Returns:
274 * >0: A pointer to your struct logininfo if successful
275 * 0 on failure (will use OpenSSH's logging facilities for diagnostics)
276 *
277 */
278struct logininfo *
279login_get_lastlog(struct logininfo *li, const int uid)
280{
281 struct passwd *pw;
282
283 memset(li, '\0', sizeof(*li));
284 li->uid = uid;
285
286 /*
287 * If we don't have a 'real' lastlog, we need the username to
288 * reliably search wtmp(x) for the last login (see
289 * wtmp_get_entry().)
290 */
291 pw = getpwuid(uid);
292 if (pw == NULL)
293 fatal("login_get_lastlog: Cannot find account for uid %i", uid);
294
295 /* No MIN_SIZEOF here - we absolutely *must not* truncate the
296 * username */
297 strlcpy(li->username, pw->pw_name, sizeof(li->username));
298
299 if (getlast_entry(li))
300 return li;
301 else
302 return NULL;
303}
304
305
306/* login_alloc_entry(int, char*, char*, char*) - Allocate and initialise
307 * a logininfo structure
308 *
309 * This function creates a new struct logininfo, a data structure
310 * meant to carry the information required to portably record login info.
311 *
312 * Returns a pointer to a newly created struct logininfo. If memory
313 * allocation fails, the program halts.
314 */
315struct
316logininfo *login_alloc_entry(int pid, const char *username,
317 const char *hostname, const char *line)
318{
319 struct logininfo *newli;
320
321 newli = (struct logininfo *) xmalloc (sizeof(*newli));
322 (void)login_init_entry(newli, pid, username, hostname, line);
323 return newli;
324}
325
326
327/* login_free_entry(struct logininfo *) - free struct memory */
328void
329login_free_entry(struct logininfo *li)
330{
331 xfree(li);
332}
333
334
335/* login_init_entry(struct logininfo *, int, char*, char*, char*)
336 * - initialise a struct logininfo
337 *
338 * Populates a new struct logininfo, a data structure meant to carry
339 * the information required to portably record login info.
340 *
341 * Returns: 1
342 */
343int
344login_init_entry(struct logininfo *li, int pid, const char *username,
345 const char *hostname, const char *line)
346{
347 struct passwd *pw;
348
349 memset(li, 0, sizeof(*li));
350
351 li->pid = pid;
352
353 /* set the line information */
354 if (line)
355 line_fullname(li->line, line, sizeof(li->line));
356
357 if (username) {
358 strlcpy(li->username, username, sizeof(li->username));
359 pw = getpwnam(li->username);
360 if (pw == NULL)
361 fatal("login_init_entry: Cannot find user \"%s\"", li->username);
362 li->uid = pw->pw_uid;
363 }
364
365 if (hostname)
366 strlcpy(li->hostname, hostname, sizeof(li->hostname));
367
368 return 1;
369}
370
371/* login_set_current_time(struct logininfo *) - set the current time
372 *
373 * Set the current time in a logininfo structure. This function is
374 * meant to eliminate the need to deal with system dependencies for
375 * time handling.
376 */
377void
378login_set_current_time(struct logininfo *li)
379{
380 struct timeval tv;
381
382 gettimeofday(&tv, NULL);
383
384 li->tv_sec = tv.tv_sec;
385 li->tv_usec = tv.tv_usec;
386}
387
388/* copy a sockaddr_* into our logininfo */
389void
390login_set_addr(struct logininfo *li, const struct sockaddr *sa,
391 const unsigned int sa_size)
392{
393 unsigned int bufsize = sa_size;
394
395 /* make sure we don't overrun our union */
396 if (sizeof(li->hostaddr) < sa_size)
397 bufsize = sizeof(li->hostaddr);
398
399 memcpy((void *)&(li->hostaddr.sa), (const void *)sa, bufsize);
400}
401
402
403/**
404 ** login_write: Call low-level recording functions based on autoconf
405 ** results
406 **/
407int
408login_write (struct logininfo *li)
409{
410#ifndef HAVE_CYGWIN
411 if ((int)geteuid() != 0) {
412 logit("Attempt to write login records by non-root user (aborting)");
413 return 1;
414 }
415#endif
416
417 /* set the timestamp */
418 login_set_current_time(li);
419#ifdef USE_LOGIN
420 syslogin_write_entry(li);
421#endif
422#ifdef USE_LASTLOG
423 if (li->type == LTYPE_LOGIN) {
424 lastlog_write_entry(li);
425 }
426#endif
427#ifdef USE_UTMP
428 utmp_write_entry(li);
429#endif
430#ifdef USE_WTMP
431 wtmp_write_entry(li);
432#endif
433#ifdef USE_UTMPX
434 utmpx_write_entry(li);
435#endif
436#ifdef USE_WTMPX
437 wtmpx_write_entry(li);
438#endif
|
| 439#ifdef CUSTOM_SYS_AUTH_RECORD_LOGIN
440 if (li->type == LTYPE_LOGIN &&
441 !sys_auth_record_login(li->username,li->hostname,li->line))
442 logit("Writing login record failed for %s", li->username);
443#endif
|
439 return 0;
440}
441
442#ifdef LOGIN_NEEDS_UTMPX
443int
444login_utmp_only(struct logininfo *li)
445{
446 li->type = LTYPE_LOGIN;
447 login_set_current_time(li);
448# ifdef USE_UTMP
449 utmp_write_entry(li);
450# endif
451# ifdef USE_WTMP
452 wtmp_write_entry(li);
453# endif
454# ifdef USE_UTMPX
455 utmpx_write_entry(li);
456# endif
457# ifdef USE_WTMPX
458 wtmpx_write_entry(li);
459# endif
460 return 0;
461}
462#endif
463
464/**
465 ** getlast_entry: Call low-level functions to retrieve the last login
466 ** time.
467 **/
468
469/* take the uid in li and return the last login time */
470int
471getlast_entry(struct logininfo *li)
472{
473#ifdef USE_LASTLOG
474 return(lastlog_get_entry(li));
475#else /* !USE_LASTLOG */
476
477#ifdef DISABLE_LASTLOG
478 /* On some systems we shouldn't even try to obtain last login
479 * time, e.g. AIX */
480 return 0;
481# else /* DISABLE_LASTLOG */
482 /* Try to retrieve the last login time from wtmp */
483# if defined(USE_WTMP) && (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP))
484 /* retrieve last login time from utmp */
485 return (wtmp_get_entry(li));
486# else /* defined(USE_WTMP) && (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP)) */
487 /* If wtmp isn't available, try wtmpx */
488# if defined(USE_WTMPX) && (defined(HAVE_TIME_IN_UTMPX) || defined(HAVE_TV_IN_UTMPX))
489 /* retrieve last login time from utmpx */
490 return (wtmpx_get_entry(li));
491# else
492 /* Give up: No means of retrieving last login time */
493 return 0;
494# endif /* USE_WTMPX && (HAVE_TIME_IN_UTMPX || HAVE_TV_IN_UTMPX) */
495# endif /* USE_WTMP && (HAVE_TIME_IN_UTMP || HAVE_TV_IN_UTMP) */
496# endif /* DISABLE_LASTLOG */
497#endif /* USE_LASTLOG */
498}
499
500
501
502/*
503 * 'line' string utility functions
504 *
505 * These functions process the 'line' string into one of three forms:
506 *
507 * 1. The full filename (including '/dev')
508 * 2. The stripped name (excluding '/dev')
509 * 3. The abbreviated name (e.g. /dev/ttyp00 -> yp00
510 * /dev/pts/1 -> ts/1 )
511 *
512 * Form 3 is used on some systems to identify a .tmp.? entry when
513 * attempting to remove it. Typically both addition and removal is
514 * performed by one application - say, sshd - so as long as the choice
515 * uniquely identifies a terminal it's ok.
516 */
517
518
519/* line_fullname(): add the leading '/dev/' if it doesn't exist make
520 * sure dst has enough space, if not just copy src (ugh) */
521char *
522line_fullname(char *dst, const char *src, int dstsize)
523{
524 memset(dst, '\0', dstsize);
525 if ((strncmp(src, "/dev/", 5) == 0) || (dstsize < (strlen(src) + 5))) {
526 strlcpy(dst, src, dstsize);
527 } else {
528 strlcpy(dst, "/dev/", dstsize);
529 strlcat(dst, src, dstsize);
530 }
531 return dst;
532}
533
534/* line_stripname(): strip the leading '/dev' if it exists, return dst */
535char *
536line_stripname(char *dst, const char *src, int dstsize)
537{
538 memset(dst, '\0', dstsize);
539 if (strncmp(src, "/dev/", 5) == 0)
540 strlcpy(dst, src + 5, dstsize);
541 else
542 strlcpy(dst, src, dstsize);
543 return dst;
544}
545
546/* line_abbrevname(): Return the abbreviated (usually four-character)
547 * form of the line (Just use the last <dstsize> characters of the
548 * full name.)
549 *
550 * NOTE: use strncpy because we do NOT necessarily want zero
551 * termination */
552char *
553line_abbrevname(char *dst, const char *src, int dstsize)
554{
555 size_t len;
556
557 memset(dst, '\0', dstsize);
558
559 /* Always skip prefix if present */
560 if (strncmp(src, "/dev/", 5) == 0)
561 src += 5;
562
563#ifdef WITH_ABBREV_NO_TTY
564 if (strncmp(src, "tty", 3) == 0)
565 src += 3;
566#endif
567
568 len = strlen(src);
569
570 if (len > 0) {
571 if (((int)len - dstsize) > 0)
572 src += ((int)len - dstsize);
573
574 /* note: _don't_ change this to strlcpy */
575 strncpy(dst, src, (size_t)dstsize);
576 }
577
578 return dst;
579}
580
581/**
582 ** utmp utility functions
583 **
584 ** These functions manipulate struct utmp, taking system differences
585 ** into account.
586 **/
587
588#if defined(USE_UTMP) || defined (USE_WTMP) || defined (USE_LOGIN)
589
590/* build the utmp structure */
591void
592set_utmp_time(struct logininfo *li, struct utmp *ut)
593{
594# ifdef HAVE_TV_IN_UTMP
595 ut->ut_tv.tv_sec = li->tv_sec;
596 ut->ut_tv.tv_usec = li->tv_usec;
597# else
598# ifdef HAVE_TIME_IN_UTMP
599 ut->ut_time = li->tv_sec;
600# endif
601# endif
602}
603
604void
605construct_utmp(struct logininfo *li,
606 struct utmp *ut)
607{
608# ifdef HAVE_ADDR_V6_IN_UTMP
609 struct sockaddr_in6 *sa6;
610# endif
611 memset(ut, '\0', sizeof(*ut));
612
613 /* First fill out fields used for both logins and logouts */
614
615# ifdef HAVE_ID_IN_UTMP
616 line_abbrevname(ut->ut_id, li->line, sizeof(ut->ut_id));
617# endif
618
619# ifdef HAVE_TYPE_IN_UTMP
620 /* This is done here to keep utmp constants out of struct logininfo */
621 switch (li->type) {
622 case LTYPE_LOGIN:
623 ut->ut_type = USER_PROCESS;
624#ifdef _UNICOS
625 cray_set_tmpdir(ut);
626#endif
627 break;
628 case LTYPE_LOGOUT:
629 ut->ut_type = DEAD_PROCESS;
630#ifdef _UNICOS
631 cray_retain_utmp(ut, li->pid);
632#endif
633 break;
634 }
635# endif
636 set_utmp_time(li, ut);
637
638 line_stripname(ut->ut_line, li->line, sizeof(ut->ut_line));
639
640# ifdef HAVE_PID_IN_UTMP
641 ut->ut_pid = li->pid;
642# endif
643
644 /* If we're logging out, leave all other fields blank */
645 if (li->type == LTYPE_LOGOUT)
646 return;
647
648 /*
649 * These fields are only used when logging in, and are blank
650 * for logouts.
651 */
652
653 /* Use strncpy because we don't necessarily want null termination */
654 strncpy(ut->ut_name, li->username, MIN_SIZEOF(ut->ut_name, li->username));
655# ifdef HAVE_HOST_IN_UTMP
656 realhostname_sa(ut->ut_host, sizeof ut->ut_host,
657 &li->hostaddr.sa, li->hostaddr.sa.sa_len);
658# endif
659# ifdef HAVE_ADDR_IN_UTMP
660 /* this is just a 32-bit IP address */
661 if (li->hostaddr.sa.sa_family == AF_INET)
662 ut->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr;
663# endif
664# ifdef HAVE_ADDR_V6_IN_UTMP
665 /* this is just a 128-bit IPv6 address */
666 if (li->hostaddr.sa.sa_family == AF_INET6) {
667 sa6 = ((struct sockaddr_in6 *)&li->hostaddr.sa);
668 memcpy(ut->ut_addr_v6, sa6->sin6_addr.s6_addr, 16);
669 if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) {
670 ut->ut_addr_v6[0] = ut->ut_addr_v6[3];
671 ut->ut_addr_v6[1] = 0;
672 ut->ut_addr_v6[2] = 0;
673 ut->ut_addr_v6[3] = 0;
674 }
675 }
676# endif
677}
678#endif /* USE_UTMP || USE_WTMP || USE_LOGIN */
679
680/**
681 ** utmpx utility functions
682 **
683 ** These functions manipulate struct utmpx, accounting for system
684 ** variations.
685 **/
686
687#if defined(USE_UTMPX) || defined (USE_WTMPX)
688/* build the utmpx structure */
689void
690set_utmpx_time(struct logininfo *li, struct utmpx *utx)
691{
692# ifdef HAVE_TV_IN_UTMPX
693 utx->ut_tv.tv_sec = li->tv_sec;
694 utx->ut_tv.tv_usec = li->tv_usec;
695# else /* HAVE_TV_IN_UTMPX */
696# ifdef HAVE_TIME_IN_UTMPX
697 utx->ut_time = li->tv_sec;
698# endif /* HAVE_TIME_IN_UTMPX */
699# endif /* HAVE_TV_IN_UTMPX */
700}
701
702void
703construct_utmpx(struct logininfo *li, struct utmpx *utx)
704{
705# ifdef HAVE_ADDR_V6_IN_UTMP
706 struct sockaddr_in6 *sa6;
707# endif
708 memset(utx, '\0', sizeof(*utx));
709# ifdef HAVE_ID_IN_UTMPX
710 line_abbrevname(utx->ut_id, li->line, sizeof(utx->ut_id));
711# endif
712
713 /* this is done here to keep utmp constants out of loginrec.h */
714 switch (li->type) {
715 case LTYPE_LOGIN:
716 utx->ut_type = USER_PROCESS;
717 break;
718 case LTYPE_LOGOUT:
719 utx->ut_type = DEAD_PROCESS;
720 break;
721 }
722 line_stripname(utx->ut_line, li->line, sizeof(utx->ut_line));
723 set_utmpx_time(li, utx);
724 utx->ut_pid = li->pid;
725 /* strncpy(): Don't necessarily want null termination */
726 strncpy(utx->ut_name, li->username, MIN_SIZEOF(utx->ut_name, li->username));
727
728 if (li->type == LTYPE_LOGOUT)
729 return;
730
731 /*
732 * These fields are only used when logging in, and are blank
733 * for logouts.
734 */
735
736# ifdef HAVE_HOST_IN_UTMPX
737 strncpy(utx->ut_host, li->hostname, MIN_SIZEOF(utx->ut_host, li->hostname));
738# endif
739# ifdef HAVE_ADDR_IN_UTMPX
740 /* this is just a 32-bit IP address */
741 if (li->hostaddr.sa.sa_family == AF_INET)
742 utx->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr;
743# endif
744# ifdef HAVE_ADDR_V6_IN_UTMP
745 /* this is just a 128-bit IPv6 address */
746 if (li->hostaddr.sa.sa_family == AF_INET6) {
747 sa6 = ((struct sockaddr_in6 *)&li->hostaddr.sa);
748 memcpy(ut->ut_addr_v6, sa6->sin6_addr.s6_addr, 16);
749 if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) {
750 ut->ut_addr_v6[0] = ut->ut_addr_v6[3];
751 ut->ut_addr_v6[1] = 0;
752 ut->ut_addr_v6[2] = 0;
753 ut->ut_addr_v6[3] = 0;
754 }
755 }
756# endif
757# ifdef HAVE_SYSLEN_IN_UTMPX
758 /* ut_syslen is the length of the utx_host string */
759 utx->ut_syslen = MIN(strlen(li->hostname), sizeof(utx->ut_host));
760# endif
761}
762#endif /* USE_UTMPX || USE_WTMPX */
763
764/**
765 ** Low-level utmp functions
766 **/
767
768/* FIXME: (ATL) utmp_write_direct needs testing */
769#ifdef USE_UTMP
770
771/* if we can, use pututline() etc. */
772# if !defined(DISABLE_PUTUTLINE) && defined(HAVE_SETUTENT) && \
773 defined(HAVE_PUTUTLINE)
774# define UTMP_USE_LIBRARY
775# endif
776
777
778/* write a utmp entry with the system's help (pututline() and pals) */
779# ifdef UTMP_USE_LIBRARY
780static int
781utmp_write_library(struct logininfo *li, struct utmp *ut)
782{
783 setutent();
784 pututline(ut);
785
786# ifdef HAVE_ENDUTENT
787 endutent();
788# endif
789 return 1;
790}
791# else /* UTMP_USE_LIBRARY */
792
793/* write a utmp entry direct to the file */
794/* This is a slightly modification of code in OpenBSD's login.c */
795static int
796utmp_write_direct(struct logininfo *li, struct utmp *ut)
797{
798 struct utmp old_ut;
799 register int fd;
800 int tty;
801
802 /* FIXME: (ATL) ttyslot() needs local implementation */
803
804#if defined(HAVE_GETTTYENT)
805 register struct ttyent *ty;
806
807 tty=0;
808
809 setttyent();
810 while ((struct ttyent *)0 != (ty = getttyent())) {
811 tty++;
812 if (!strncmp(ty->ty_name, ut->ut_line, sizeof(ut->ut_line)))
813 break;
814 }
815 endttyent();
816
817 if((struct ttyent *)0 == ty) {
| 444 return 0;
445}
446
447#ifdef LOGIN_NEEDS_UTMPX
448int
449login_utmp_only(struct logininfo *li)
450{
451 li->type = LTYPE_LOGIN;
452 login_set_current_time(li);
453# ifdef USE_UTMP
454 utmp_write_entry(li);
455# endif
456# ifdef USE_WTMP
457 wtmp_write_entry(li);
458# endif
459# ifdef USE_UTMPX
460 utmpx_write_entry(li);
461# endif
462# ifdef USE_WTMPX
463 wtmpx_write_entry(li);
464# endif
465 return 0;
466}
467#endif
468
469/**
470 ** getlast_entry: Call low-level functions to retrieve the last login
471 ** time.
472 **/
473
474/* take the uid in li and return the last login time */
475int
476getlast_entry(struct logininfo *li)
477{
478#ifdef USE_LASTLOG
479 return(lastlog_get_entry(li));
480#else /* !USE_LASTLOG */
481
482#ifdef DISABLE_LASTLOG
483 /* On some systems we shouldn't even try to obtain last login
484 * time, e.g. AIX */
485 return 0;
486# else /* DISABLE_LASTLOG */
487 /* Try to retrieve the last login time from wtmp */
488# if defined(USE_WTMP) && (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP))
489 /* retrieve last login time from utmp */
490 return (wtmp_get_entry(li));
491# else /* defined(USE_WTMP) && (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP)) */
492 /* If wtmp isn't available, try wtmpx */
493# if defined(USE_WTMPX) && (defined(HAVE_TIME_IN_UTMPX) || defined(HAVE_TV_IN_UTMPX))
494 /* retrieve last login time from utmpx */
495 return (wtmpx_get_entry(li));
496# else
497 /* Give up: No means of retrieving last login time */
498 return 0;
499# endif /* USE_WTMPX && (HAVE_TIME_IN_UTMPX || HAVE_TV_IN_UTMPX) */
500# endif /* USE_WTMP && (HAVE_TIME_IN_UTMP || HAVE_TV_IN_UTMP) */
501# endif /* DISABLE_LASTLOG */
502#endif /* USE_LASTLOG */
503}
504
505
506
507/*
508 * 'line' string utility functions
509 *
510 * These functions process the 'line' string into one of three forms:
511 *
512 * 1. The full filename (including '/dev')
513 * 2. The stripped name (excluding '/dev')
514 * 3. The abbreviated name (e.g. /dev/ttyp00 -> yp00
515 * /dev/pts/1 -> ts/1 )
516 *
517 * Form 3 is used on some systems to identify a .tmp.? entry when
518 * attempting to remove it. Typically both addition and removal is
519 * performed by one application - say, sshd - so as long as the choice
520 * uniquely identifies a terminal it's ok.
521 */
522
523
524/* line_fullname(): add the leading '/dev/' if it doesn't exist make
525 * sure dst has enough space, if not just copy src (ugh) */
526char *
527line_fullname(char *dst, const char *src, int dstsize)
528{
529 memset(dst, '\0', dstsize);
530 if ((strncmp(src, "/dev/", 5) == 0) || (dstsize < (strlen(src) + 5))) {
531 strlcpy(dst, src, dstsize);
532 } else {
533 strlcpy(dst, "/dev/", dstsize);
534 strlcat(dst, src, dstsize);
535 }
536 return dst;
537}
538
539/* line_stripname(): strip the leading '/dev' if it exists, return dst */
540char *
541line_stripname(char *dst, const char *src, int dstsize)
542{
543 memset(dst, '\0', dstsize);
544 if (strncmp(src, "/dev/", 5) == 0)
545 strlcpy(dst, src + 5, dstsize);
546 else
547 strlcpy(dst, src, dstsize);
548 return dst;
549}
550
551/* line_abbrevname(): Return the abbreviated (usually four-character)
552 * form of the line (Just use the last <dstsize> characters of the
553 * full name.)
554 *
555 * NOTE: use strncpy because we do NOT necessarily want zero
556 * termination */
557char *
558line_abbrevname(char *dst, const char *src, int dstsize)
559{
560 size_t len;
561
562 memset(dst, '\0', dstsize);
563
564 /* Always skip prefix if present */
565 if (strncmp(src, "/dev/", 5) == 0)
566 src += 5;
567
568#ifdef WITH_ABBREV_NO_TTY
569 if (strncmp(src, "tty", 3) == 0)
570 src += 3;
571#endif
572
573 len = strlen(src);
574
575 if (len > 0) {
576 if (((int)len - dstsize) > 0)
577 src += ((int)len - dstsize);
578
579 /* note: _don't_ change this to strlcpy */
580 strncpy(dst, src, (size_t)dstsize);
581 }
582
583 return dst;
584}
585
586/**
587 ** utmp utility functions
588 **
589 ** These functions manipulate struct utmp, taking system differences
590 ** into account.
591 **/
592
593#if defined(USE_UTMP) || defined (USE_WTMP) || defined (USE_LOGIN)
594
595/* build the utmp structure */
596void
597set_utmp_time(struct logininfo *li, struct utmp *ut)
598{
599# ifdef HAVE_TV_IN_UTMP
600 ut->ut_tv.tv_sec = li->tv_sec;
601 ut->ut_tv.tv_usec = li->tv_usec;
602# else
603# ifdef HAVE_TIME_IN_UTMP
604 ut->ut_time = li->tv_sec;
605# endif
606# endif
607}
608
609void
610construct_utmp(struct logininfo *li,
611 struct utmp *ut)
612{
613# ifdef HAVE_ADDR_V6_IN_UTMP
614 struct sockaddr_in6 *sa6;
615# endif
616 memset(ut, '\0', sizeof(*ut));
617
618 /* First fill out fields used for both logins and logouts */
619
620# ifdef HAVE_ID_IN_UTMP
621 line_abbrevname(ut->ut_id, li->line, sizeof(ut->ut_id));
622# endif
623
624# ifdef HAVE_TYPE_IN_UTMP
625 /* This is done here to keep utmp constants out of struct logininfo */
626 switch (li->type) {
627 case LTYPE_LOGIN:
628 ut->ut_type = USER_PROCESS;
629#ifdef _UNICOS
630 cray_set_tmpdir(ut);
631#endif
632 break;
633 case LTYPE_LOGOUT:
634 ut->ut_type = DEAD_PROCESS;
635#ifdef _UNICOS
636 cray_retain_utmp(ut, li->pid);
637#endif
638 break;
639 }
640# endif
641 set_utmp_time(li, ut);
642
643 line_stripname(ut->ut_line, li->line, sizeof(ut->ut_line));
644
645# ifdef HAVE_PID_IN_UTMP
646 ut->ut_pid = li->pid;
647# endif
648
649 /* If we're logging out, leave all other fields blank */
650 if (li->type == LTYPE_LOGOUT)
651 return;
652
653 /*
654 * These fields are only used when logging in, and are blank
655 * for logouts.
656 */
657
658 /* Use strncpy because we don't necessarily want null termination */
659 strncpy(ut->ut_name, li->username, MIN_SIZEOF(ut->ut_name, li->username));
660# ifdef HAVE_HOST_IN_UTMP
661 realhostname_sa(ut->ut_host, sizeof ut->ut_host,
662 &li->hostaddr.sa, li->hostaddr.sa.sa_len);
663# endif
664# ifdef HAVE_ADDR_IN_UTMP
665 /* this is just a 32-bit IP address */
666 if (li->hostaddr.sa.sa_family == AF_INET)
667 ut->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr;
668# endif
669# ifdef HAVE_ADDR_V6_IN_UTMP
670 /* this is just a 128-bit IPv6 address */
671 if (li->hostaddr.sa.sa_family == AF_INET6) {
672 sa6 = ((struct sockaddr_in6 *)&li->hostaddr.sa);
673 memcpy(ut->ut_addr_v6, sa6->sin6_addr.s6_addr, 16);
674 if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) {
675 ut->ut_addr_v6[0] = ut->ut_addr_v6[3];
676 ut->ut_addr_v6[1] = 0;
677 ut->ut_addr_v6[2] = 0;
678 ut->ut_addr_v6[3] = 0;
679 }
680 }
681# endif
682}
683#endif /* USE_UTMP || USE_WTMP || USE_LOGIN */
684
685/**
686 ** utmpx utility functions
687 **
688 ** These functions manipulate struct utmpx, accounting for system
689 ** variations.
690 **/
691
692#if defined(USE_UTMPX) || defined (USE_WTMPX)
693/* build the utmpx structure */
694void
695set_utmpx_time(struct logininfo *li, struct utmpx *utx)
696{
697# ifdef HAVE_TV_IN_UTMPX
698 utx->ut_tv.tv_sec = li->tv_sec;
699 utx->ut_tv.tv_usec = li->tv_usec;
700# else /* HAVE_TV_IN_UTMPX */
701# ifdef HAVE_TIME_IN_UTMPX
702 utx->ut_time = li->tv_sec;
703# endif /* HAVE_TIME_IN_UTMPX */
704# endif /* HAVE_TV_IN_UTMPX */
705}
706
707void
708construct_utmpx(struct logininfo *li, struct utmpx *utx)
709{
710# ifdef HAVE_ADDR_V6_IN_UTMP
711 struct sockaddr_in6 *sa6;
712# endif
713 memset(utx, '\0', sizeof(*utx));
714# ifdef HAVE_ID_IN_UTMPX
715 line_abbrevname(utx->ut_id, li->line, sizeof(utx->ut_id));
716# endif
717
718 /* this is done here to keep utmp constants out of loginrec.h */
719 switch (li->type) {
720 case LTYPE_LOGIN:
721 utx->ut_type = USER_PROCESS;
722 break;
723 case LTYPE_LOGOUT:
724 utx->ut_type = DEAD_PROCESS;
725 break;
726 }
727 line_stripname(utx->ut_line, li->line, sizeof(utx->ut_line));
728 set_utmpx_time(li, utx);
729 utx->ut_pid = li->pid;
730 /* strncpy(): Don't necessarily want null termination */
731 strncpy(utx->ut_name, li->username, MIN_SIZEOF(utx->ut_name, li->username));
732
733 if (li->type == LTYPE_LOGOUT)
734 return;
735
736 /*
737 * These fields are only used when logging in, and are blank
738 * for logouts.
739 */
740
741# ifdef HAVE_HOST_IN_UTMPX
742 strncpy(utx->ut_host, li->hostname, MIN_SIZEOF(utx->ut_host, li->hostname));
743# endif
744# ifdef HAVE_ADDR_IN_UTMPX
745 /* this is just a 32-bit IP address */
746 if (li->hostaddr.sa.sa_family == AF_INET)
747 utx->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr;
748# endif
749# ifdef HAVE_ADDR_V6_IN_UTMP
750 /* this is just a 128-bit IPv6 address */
751 if (li->hostaddr.sa.sa_family == AF_INET6) {
752 sa6 = ((struct sockaddr_in6 *)&li->hostaddr.sa);
753 memcpy(ut->ut_addr_v6, sa6->sin6_addr.s6_addr, 16);
754 if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) {
755 ut->ut_addr_v6[0] = ut->ut_addr_v6[3];
756 ut->ut_addr_v6[1] = 0;
757 ut->ut_addr_v6[2] = 0;
758 ut->ut_addr_v6[3] = 0;
759 }
760 }
761# endif
762# ifdef HAVE_SYSLEN_IN_UTMPX
763 /* ut_syslen is the length of the utx_host string */
764 utx->ut_syslen = MIN(strlen(li->hostname), sizeof(utx->ut_host));
765# endif
766}
767#endif /* USE_UTMPX || USE_WTMPX */
768
769/**
770 ** Low-level utmp functions
771 **/
772
773/* FIXME: (ATL) utmp_write_direct needs testing */
774#ifdef USE_UTMP
775
776/* if we can, use pututline() etc. */
777# if !defined(DISABLE_PUTUTLINE) && defined(HAVE_SETUTENT) && \
778 defined(HAVE_PUTUTLINE)
779# define UTMP_USE_LIBRARY
780# endif
781
782
783/* write a utmp entry with the system's help (pututline() and pals) */
784# ifdef UTMP_USE_LIBRARY
785static int
786utmp_write_library(struct logininfo *li, struct utmp *ut)
787{
788 setutent();
789 pututline(ut);
790
791# ifdef HAVE_ENDUTENT
792 endutent();
793# endif
794 return 1;
795}
796# else /* UTMP_USE_LIBRARY */
797
798/* write a utmp entry direct to the file */
799/* This is a slightly modification of code in OpenBSD's login.c */
800static int
801utmp_write_direct(struct logininfo *li, struct utmp *ut)
802{
803 struct utmp old_ut;
804 register int fd;
805 int tty;
806
807 /* FIXME: (ATL) ttyslot() needs local implementation */
808
809#if defined(HAVE_GETTTYENT)
810 register struct ttyent *ty;
811
812 tty=0;
813
814 setttyent();
815 while ((struct ttyent *)0 != (ty = getttyent())) {
816 tty++;
817 if (!strncmp(ty->ty_name, ut->ut_line, sizeof(ut->ut_line)))
818 break;
819 }
820 endttyent();
821
822 if((struct ttyent *)0 == ty) {
|
818 logit("utmp_write_entry: tty not found");
819 return(1);
| 823 logit("%s: tty not found", __func__);
824 return (0);
|
820 }
821#else /* FIXME */
822
823 tty = ttyslot(); /* seems only to work for /dev/ttyp? style names */
824
825#endif /* HAVE_GETTTYENT */
826
827 if (tty > 0 && (fd = open(UTMP_FILE, O_RDWR|O_CREAT, 0644)) >= 0) {
| 825 }
826#else /* FIXME */
827
828 tty = ttyslot(); /* seems only to work for /dev/ttyp? style names */
829
830#endif /* HAVE_GETTTYENT */
831
832 if (tty > 0 && (fd = open(UTMP_FILE, O_RDWR|O_CREAT, 0644)) >= 0) {
|
828 (void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET);
| 833 off_t pos, ret;
834
835 pos = (off_t)tty * sizeof(struct utmp);
836 if ((ret = lseek(fd, pos, SEEK_SET)) == -1) {
837 logit("%s: llseek: %s", strerror(errno));
838 return (0);
839 }
840 if (ret != pos) {
841 logit("%s: Couldn't seek to tty %s slot in %s", tty,
842 UTMP_FILE);
843 return (0);
844 }
|
829 /*
830 * Prevent luser from zero'ing out ut_host.
831 * If the new ut_line is empty but the old one is not
832 * and ut_line and ut_name match, preserve the old ut_line.
833 */
834 if (atomicio(read, fd, &old_ut, sizeof(old_ut)) == sizeof(old_ut) &&
835 (ut->ut_host[0] == '\0') && (old_ut.ut_host[0] != '\0') &&
836 (strncmp(old_ut.ut_line, ut->ut_line, sizeof(ut->ut_line)) == 0) &&
837 (strncmp(old_ut.ut_name, ut->ut_name, sizeof(ut->ut_name)) == 0)) {
838 (void)memcpy(ut->ut_host, old_ut.ut_host, sizeof(ut->ut_host));
839 }
840
| 845 /*
846 * Prevent luser from zero'ing out ut_host.
847 * If the new ut_line is empty but the old one is not
848 * and ut_line and ut_name match, preserve the old ut_line.
849 */
850 if (atomicio(read, fd, &old_ut, sizeof(old_ut)) == sizeof(old_ut) &&
851 (ut->ut_host[0] == '\0') && (old_ut.ut_host[0] != '\0') &&
852 (strncmp(old_ut.ut_line, ut->ut_line, sizeof(ut->ut_line)) == 0) &&
853 (strncmp(old_ut.ut_name, ut->ut_name, sizeof(ut->ut_name)) == 0)) {
854 (void)memcpy(ut->ut_host, old_ut.ut_host, sizeof(ut->ut_host));
855 }
856
|
841 (void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET);
| 857 if ((ret = lseek(fd, pos, SEEK_SET)) == -1) {
858 logit("%s: llseek: %s", __func__, strerror(errno));
859 return (0);
860 }
861 if (ret != pos) {
862 logit("%s: Couldn't seek to tty %s slot in %s",
863 __func__, tty, UTMP_FILE);
864 return (0);
865 }
|
842 if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut))
| 866 if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut))
|
843 logit("utmp_write_direct: error writing %s: %s",
| 867 logit("%s: error writing %s: %s", __func__,
|
844 UTMP_FILE, strerror(errno));
845
846 (void)close(fd);
847 return 1;
848 } else {
849 return 0;
850 }
851}
852# endif /* UTMP_USE_LIBRARY */
853
854static int
855utmp_perform_login(struct logininfo *li)
856{
857 struct utmp ut;
858
859 construct_utmp(li, &ut);
860# ifdef UTMP_USE_LIBRARY
861 if (!utmp_write_library(li, &ut)) {
862 logit("utmp_perform_login: utmp_write_library() failed");
863 return 0;
864 }
865# else
866 if (!utmp_write_direct(li, &ut)) {
867 logit("utmp_perform_login: utmp_write_direct() failed");
868 return 0;
869 }
870# endif
871 return 1;
872}
873
874
875static int
876utmp_perform_logout(struct logininfo *li)
877{
878 struct utmp ut;
879
880 construct_utmp(li, &ut);
881# ifdef UTMP_USE_LIBRARY
882 if (!utmp_write_library(li, &ut)) {
883 logit("utmp_perform_logout: utmp_write_library() failed");
884 return 0;
885 }
886# else
887 if (!utmp_write_direct(li, &ut)) {
888 logit("utmp_perform_logout: utmp_write_direct() failed");
889 return 0;
890 }
891# endif
892 return 1;
893}
894
895
896int
897utmp_write_entry(struct logininfo *li)
898{
899 switch(li->type) {
900 case LTYPE_LOGIN:
901 return utmp_perform_login(li);
902
903 case LTYPE_LOGOUT:
904 return utmp_perform_logout(li);
905
906 default:
907 logit("utmp_write_entry: invalid type field");
908 return 0;
909 }
910}
911#endif /* USE_UTMP */
912
913
914/**
915 ** Low-level utmpx functions
916 **/
917
918/* not much point if we don't want utmpx entries */
919#ifdef USE_UTMPX
920
921/* if we have the wherewithall, use pututxline etc. */
922# if !defined(DISABLE_PUTUTXLINE) && defined(HAVE_SETUTXENT) && \
923 defined(HAVE_PUTUTXLINE)
924# define UTMPX_USE_LIBRARY
925# endif
926
927
928/* write a utmpx entry with the system's help (pututxline() and pals) */
929# ifdef UTMPX_USE_LIBRARY
930static int
931utmpx_write_library(struct logininfo *li, struct utmpx *utx)
932{
933 setutxent();
934 pututxline(utx);
935
936# ifdef HAVE_ENDUTXENT
937 endutxent();
938# endif
939 return 1;
940}
941
942# else /* UTMPX_USE_LIBRARY */
943
944/* write a utmp entry direct to the file */
945static int
946utmpx_write_direct(struct logininfo *li, struct utmpx *utx)
947{
948 logit("utmpx_write_direct: not implemented!");
949 return 0;
950}
951# endif /* UTMPX_USE_LIBRARY */
952
953static int
954utmpx_perform_login(struct logininfo *li)
955{
956 struct utmpx utx;
957
958 construct_utmpx(li, &utx);
959# ifdef UTMPX_USE_LIBRARY
960 if (!utmpx_write_library(li, &utx)) {
961 logit("utmpx_perform_login: utmp_write_library() failed");
962 return 0;
963 }
964# else
965 if (!utmpx_write_direct(li, &ut)) {
966 logit("utmpx_perform_login: utmp_write_direct() failed");
967 return 0;
968 }
969# endif
970 return 1;
971}
972
973
974static int
975utmpx_perform_logout(struct logininfo *li)
976{
977 struct utmpx utx;
978
979 construct_utmpx(li, &utx);
980# ifdef HAVE_ID_IN_UTMPX
981 line_abbrevname(utx.ut_id, li->line, sizeof(utx.ut_id));
982# endif
983# ifdef HAVE_TYPE_IN_UTMPX
984 utx.ut_type = DEAD_PROCESS;
985# endif
986
987# ifdef UTMPX_USE_LIBRARY
988 utmpx_write_library(li, &utx);
989# else
990 utmpx_write_direct(li, &utx);
991# endif
992 return 1;
993}
994
995int
996utmpx_write_entry(struct logininfo *li)
997{
998 switch(li->type) {
999 case LTYPE_LOGIN:
1000 return utmpx_perform_login(li);
1001 case LTYPE_LOGOUT:
1002 return utmpx_perform_logout(li);
1003 default:
1004 logit("utmpx_write_entry: invalid type field");
1005 return 0;
1006 }
1007}
1008#endif /* USE_UTMPX */
1009
1010
1011/**
1012 ** Low-level wtmp functions
1013 **/
1014
1015#ifdef USE_WTMP
1016
1017/* write a wtmp entry direct to the end of the file */
1018/* This is a slight modification of code in OpenBSD's logwtmp.c */
1019static int
1020wtmp_write(struct logininfo *li, struct utmp *ut)
1021{
1022 struct stat buf;
1023 int fd, ret = 1;
1024
1025 if ((fd = open(WTMP_FILE, O_WRONLY|O_APPEND, 0)) < 0) {
1026 logit("wtmp_write: problem writing %s: %s",
1027 WTMP_FILE, strerror(errno));
1028 return 0;
1029 }
1030 if (fstat(fd, &buf) == 0)
1031 if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut)) {
1032 ftruncate(fd, buf.st_size);
1033 logit("wtmp_write: problem writing %s: %s",
1034 WTMP_FILE, strerror(errno));
1035 ret = 0;
1036 }
1037 (void)close(fd);
1038 return ret;
1039}
1040
1041static int
1042wtmp_perform_login(struct logininfo *li)
1043{
1044 struct utmp ut;
1045
1046 construct_utmp(li, &ut);
1047 return wtmp_write(li, &ut);
1048}
1049
1050
1051static int
1052wtmp_perform_logout(struct logininfo *li)
1053{
1054 struct utmp ut;
1055
1056 construct_utmp(li, &ut);
1057 return wtmp_write(li, &ut);
1058}
1059
1060
1061int
1062wtmp_write_entry(struct logininfo *li)
1063{
1064 switch(li->type) {
1065 case LTYPE_LOGIN:
1066 return wtmp_perform_login(li);
1067 case LTYPE_LOGOUT:
1068 return wtmp_perform_logout(li);
1069 default:
1070 logit("wtmp_write_entry: invalid type field");
1071 return 0;
1072 }
1073}
1074
1075
1076/* Notes on fetching login data from wtmp/wtmpx
1077 *
1078 * Logouts are usually recorded with (amongst other things) a blank
1079 * username on a given tty line. However, some systems (HP-UX is one)
1080 * leave all fields set, but change the ut_type field to DEAD_PROCESS.
1081 *
1082 * Since we're only looking for logins here, we know that the username
1083 * must be set correctly. On systems that leave it in, we check for
1084 * ut_type==USER_PROCESS (indicating a login.)
1085 *
1086 * Portability: Some systems may set something other than USER_PROCESS
1087 * to indicate a login process. I don't know of any as I write. Also,
1088 * it's possible that some systems may both leave the username in
1089 * place and not have ut_type.
1090 */
1091
1092/* return true if this wtmp entry indicates a login */
1093static int
1094wtmp_islogin(struct logininfo *li, struct utmp *ut)
1095{
1096 if (strncmp(li->username, ut->ut_name,
1097 MIN_SIZEOF(li->username, ut->ut_name)) == 0) {
1098# ifdef HAVE_TYPE_IN_UTMP
1099 if (ut->ut_type & USER_PROCESS)
1100 return 1;
1101# else
1102 return 1;
1103# endif
1104 }
1105 return 0;
1106}
1107
1108int
1109wtmp_get_entry(struct logininfo *li)
1110{
1111 struct stat st;
1112 struct utmp ut;
1113 int fd, found=0;
1114
1115 /* Clear the time entries in our logininfo */
1116 li->tv_sec = li->tv_usec = 0;
1117
1118 if ((fd = open(WTMP_FILE, O_RDONLY)) < 0) {
1119 logit("wtmp_get_entry: problem opening %s: %s",
1120 WTMP_FILE, strerror(errno));
1121 return 0;
1122 }
1123 if (fstat(fd, &st) != 0) {
1124 logit("wtmp_get_entry: couldn't stat %s: %s",
1125 WTMP_FILE, strerror(errno));
1126 close(fd);
1127 return 0;
1128 }
1129
1130 /* Seek to the start of the last struct utmp */
1131 if (lseek(fd, -(off_t)sizeof(struct utmp), SEEK_END) == -1) {
1132 /* Looks like we've got a fresh wtmp file */
1133 close(fd);
1134 return 0;
1135 }
1136
1137 while (!found) {
1138 if (atomicio(read, fd, &ut, sizeof(ut)) != sizeof(ut)) {
1139 logit("wtmp_get_entry: read of %s failed: %s",
1140 WTMP_FILE, strerror(errno));
1141 close (fd);
1142 return 0;
1143 }
1144 if ( wtmp_islogin(li, &ut) ) {
1145 found = 1;
1146 /* We've already checked for a time in struct
1147 * utmp, in login_getlast(). */
1148# ifdef HAVE_TIME_IN_UTMP
1149 li->tv_sec = ut.ut_time;
1150# else
1151# if HAVE_TV_IN_UTMP
1152 li->tv_sec = ut.ut_tv.tv_sec;
1153# endif
1154# endif
1155 line_fullname(li->line, ut.ut_line,
1156 MIN_SIZEOF(li->line, ut.ut_line));
1157# ifdef HAVE_HOST_IN_UTMP
1158 strlcpy(li->hostname, ut.ut_host,
1159 MIN_SIZEOF(li->hostname, ut.ut_host));
1160# endif
1161 continue;
1162 }
1163 /* Seek back 2 x struct utmp */
1164 if (lseek(fd, -(off_t)(2 * sizeof(struct utmp)), SEEK_CUR) == -1) {
1165 /* We've found the start of the file, so quit */
1166 close (fd);
1167 return 0;
1168 }
1169 }
1170
1171 /* We found an entry. Tidy up and return */
1172 close(fd);
1173 return 1;
1174}
1175# endif /* USE_WTMP */
1176
1177
1178/**
1179 ** Low-level wtmpx functions
1180 **/
1181
1182#ifdef USE_WTMPX
1183/* write a wtmpx entry direct to the end of the file */
1184/* This is a slight modification of code in OpenBSD's logwtmp.c */
1185static int
1186wtmpx_write(struct logininfo *li, struct utmpx *utx)
1187{
1188#ifndef HAVE_UPDWTMPX
1189 struct stat buf;
1190 int fd, ret = 1;
1191
1192 if ((fd = open(WTMPX_FILE, O_WRONLY|O_APPEND, 0)) < 0) {
1193 logit("wtmpx_write: problem opening %s: %s",
1194 WTMPX_FILE, strerror(errno));
1195 return 0;
1196 }
1197
1198 if (fstat(fd, &buf) == 0)
1199 if (atomicio(vwrite, fd, utx, sizeof(*utx)) != sizeof(*utx)) {
1200 ftruncate(fd, buf.st_size);
1201 logit("wtmpx_write: problem writing %s: %s",
1202 WTMPX_FILE, strerror(errno));
1203 ret = 0;
1204 }
1205 (void)close(fd);
1206
1207 return ret;
1208#else
1209 updwtmpx(WTMPX_FILE, utx);
1210 return 1;
1211#endif
1212}
1213
1214
1215static int
1216wtmpx_perform_login(struct logininfo *li)
1217{
1218 struct utmpx utx;
1219
1220 construct_utmpx(li, &utx);
1221 return wtmpx_write(li, &utx);
1222}
1223
1224
1225static int
1226wtmpx_perform_logout(struct logininfo *li)
1227{
1228 struct utmpx utx;
1229
1230 construct_utmpx(li, &utx);
1231 return wtmpx_write(li, &utx);
1232}
1233
1234
1235int
1236wtmpx_write_entry(struct logininfo *li)
1237{
1238 switch(li->type) {
1239 case LTYPE_LOGIN:
1240 return wtmpx_perform_login(li);
1241 case LTYPE_LOGOUT:
1242 return wtmpx_perform_logout(li);
1243 default:
1244 logit("wtmpx_write_entry: invalid type field");
1245 return 0;
1246 }
1247}
1248
1249/* Please see the notes above wtmp_islogin() for information about the
1250 next two functions */
1251
1252/* Return true if this wtmpx entry indicates a login */
1253static int
1254wtmpx_islogin(struct logininfo *li, struct utmpx *utx)
1255{
1256 if ( strncmp(li->username, utx->ut_name,
1257 MIN_SIZEOF(li->username, utx->ut_name)) == 0 ) {
1258# ifdef HAVE_TYPE_IN_UTMPX
1259 if (utx->ut_type == USER_PROCESS)
1260 return 1;
1261# else
1262 return 1;
1263# endif
1264 }
1265 return 0;
1266}
1267
1268
1269int
1270wtmpx_get_entry(struct logininfo *li)
1271{
1272 struct stat st;
1273 struct utmpx utx;
1274 int fd, found=0;
1275
1276 /* Clear the time entries */
1277 li->tv_sec = li->tv_usec = 0;
1278
1279 if ((fd = open(WTMPX_FILE, O_RDONLY)) < 0) {
1280 logit("wtmpx_get_entry: problem opening %s: %s",
1281 WTMPX_FILE, strerror(errno));
1282 return 0;
1283 }
1284 if (fstat(fd, &st) != 0) {
1285 logit("wtmpx_get_entry: couldn't stat %s: %s",
1286 WTMPX_FILE, strerror(errno));
1287 close(fd);
1288 return 0;
1289 }
1290
1291 /* Seek to the start of the last struct utmpx */
1292 if (lseek(fd, -(off_t)sizeof(struct utmpx), SEEK_END) == -1 ) {
1293 /* probably a newly rotated wtmpx file */
1294 close(fd);
1295 return 0;
1296 }
1297
1298 while (!found) {
1299 if (atomicio(read, fd, &utx, sizeof(utx)) != sizeof(utx)) {
1300 logit("wtmpx_get_entry: read of %s failed: %s",
1301 WTMPX_FILE, strerror(errno));
1302 close (fd);
1303 return 0;
1304 }
1305 /* Logouts are recorded as a blank username on a particular line.
1306 * So, we just need to find the username in struct utmpx */
1307 if ( wtmpx_islogin(li, &utx) ) {
1308 found = 1;
1309# ifdef HAVE_TV_IN_UTMPX
1310 li->tv_sec = utx.ut_tv.tv_sec;
1311# else
1312# ifdef HAVE_TIME_IN_UTMPX
1313 li->tv_sec = utx.ut_time;
1314# endif
1315# endif
1316 line_fullname(li->line, utx.ut_line, sizeof(li->line));
1317# ifdef HAVE_HOST_IN_UTMPX
1318 strlcpy(li->hostname, utx.ut_host,
1319 MIN_SIZEOF(li->hostname, utx.ut_host));
1320# endif
1321 continue;
1322 }
1323 if (lseek(fd, -(off_t)(2 * sizeof(struct utmpx)), SEEK_CUR) == -1) {
1324 close (fd);
1325 return 0;
1326 }
1327 }
1328
1329 close(fd);
1330 return 1;
1331}
1332#endif /* USE_WTMPX */
1333
1334/**
1335 ** Low-level libutil login() functions
1336 **/
1337
1338#ifdef USE_LOGIN
1339static int
1340syslogin_perform_login(struct logininfo *li)
1341{
1342 struct utmp *ut;
1343
1344 if (! (ut = (struct utmp *)malloc(sizeof(*ut)))) {
1345 logit("syslogin_perform_login: couldn't malloc()");
1346 return 0;
1347 }
1348 construct_utmp(li, ut);
1349 login(ut);
1350 free(ut);
1351
1352 return 1;
1353}
1354
1355static int
1356syslogin_perform_logout(struct logininfo *li)
1357{
1358# ifdef HAVE_LOGOUT
1359 char line[UT_LINESIZE];
1360
1361 (void)line_stripname(line, li->line, sizeof(line));
1362
1363 if (!logout(line)) {
1364 logit("syslogin_perform_logout: logout() returned an error");
1365# ifdef HAVE_LOGWTMP
1366 } else {
1367 logwtmp(line, "", "");
1368# endif
1369 }
1370 /* FIXME: (ATL - if the need arises) What to do if we have
1371 * login, but no logout? what if logout but no logwtmp? All
1372 * routines are in libutil so they should all be there,
1373 * but... */
1374# endif
1375 return 1;
1376}
1377
1378int
1379syslogin_write_entry(struct logininfo *li)
1380{
1381 switch (li->type) {
1382 case LTYPE_LOGIN:
1383 return syslogin_perform_login(li);
1384 case LTYPE_LOGOUT:
1385 return syslogin_perform_logout(li);
1386 default:
1387 logit("syslogin_write_entry: Invalid type field");
1388 return 0;
1389 }
1390}
1391#endif /* USE_LOGIN */
1392
1393/* end of file log-syslogin.c */
1394
1395/**
1396 ** Low-level lastlog functions
1397 **/
1398
1399#ifdef USE_LASTLOG
1400#define LL_FILE 1
1401#define LL_DIR 2
1402#define LL_OTHER 3
1403
1404static void
1405lastlog_construct(struct logininfo *li, struct lastlog *last)
1406{
1407 /* clear the structure */
1408 memset(last, '\0', sizeof(*last));
1409
1410 (void)line_stripname(last->ll_line, li->line, sizeof(last->ll_line));
1411 strlcpy(last->ll_host, li->hostname,
1412 MIN_SIZEOF(last->ll_host, li->hostname));
1413 last->ll_time = li->tv_sec;
1414}
1415
1416static int
1417lastlog_filetype(char *filename)
1418{
1419 struct stat st;
1420
1421 if (stat(LASTLOG_FILE, &st) != 0) {
1422 logit("lastlog_perform_login: Couldn't stat %s: %s", LASTLOG_FILE,
1423 strerror(errno));
1424 return 0;
1425 }
1426 if (S_ISDIR(st.st_mode))
1427 return LL_DIR;
1428 else if (S_ISREG(st.st_mode))
1429 return LL_FILE;
1430 else
1431 return LL_OTHER;
1432}
1433
1434
1435/* open the file (using filemode) and seek to the login entry */
1436static int
1437lastlog_openseek(struct logininfo *li, int *fd, int filemode)
1438{
1439 off_t offset;
1440 int type;
1441 char lastlog_file[1024];
1442
1443 type = lastlog_filetype(LASTLOG_FILE);
1444 switch (type) {
1445 case LL_FILE:
1446 strlcpy(lastlog_file, LASTLOG_FILE, sizeof(lastlog_file));
1447 break;
1448 case LL_DIR:
1449 snprintf(lastlog_file, sizeof(lastlog_file), "%s/%s",
1450 LASTLOG_FILE, li->username);
1451 break;
1452 default:
1453 logit("lastlog_openseek: %.100s is not a file or directory!",
1454 LASTLOG_FILE);
1455 return 0;
1456 }
1457
1458 *fd = open(lastlog_file, filemode, 0600);
1459 if ( *fd < 0) {
1460 debug("lastlog_openseek: Couldn't open %s: %s",
1461 lastlog_file, strerror(errno));
1462 return 0;
1463 }
1464
1465 if (type == LL_FILE) {
1466 /* find this uid's offset in the lastlog file */
1467 offset = (off_t) ((long)li->uid * sizeof(struct lastlog));
1468
1469 if ( lseek(*fd, offset, SEEK_SET) != offset ) {
1470 logit("lastlog_openseek: %s->lseek(): %s",
1471 lastlog_file, strerror(errno));
1472 return 0;
1473 }
1474 }
1475
1476 return 1;
1477}
1478
1479static int
1480lastlog_perform_login(struct logininfo *li)
1481{
1482 struct lastlog last;
1483 int fd;
1484
1485 /* create our struct lastlog */
1486 lastlog_construct(li, &last);
1487
1488 if (!lastlog_openseek(li, &fd, O_RDWR|O_CREAT))
1489 return(0);
1490
1491 /* write the entry */
1492 if (atomicio(vwrite, fd, &last, sizeof(last)) != sizeof(last)) {
1493 close(fd);
1494 logit("lastlog_write_filemode: Error writing to %s: %s",
1495 LASTLOG_FILE, strerror(errno));
1496 return 0;
1497 }
1498
1499 close(fd);
1500 return 1;
1501}
1502
1503int
1504lastlog_write_entry(struct logininfo *li)
1505{
1506 switch(li->type) {
1507 case LTYPE_LOGIN:
1508 return lastlog_perform_login(li);
1509 default:
1510 logit("lastlog_write_entry: Invalid type field");
1511 return 0;
1512 }
1513}
1514
1515static void
1516lastlog_populate_entry(struct logininfo *li, struct lastlog *last)
1517{
1518 line_fullname(li->line, last->ll_line, sizeof(li->line));
1519 strlcpy(li->hostname, last->ll_host,
1520 MIN_SIZEOF(li->hostname, last->ll_host));
1521 li->tv_sec = last->ll_time;
1522}
1523
1524int
1525lastlog_get_entry(struct logininfo *li)
1526{
1527 struct lastlog last;
1528 int fd, ret;
1529
1530 if (!lastlog_openseek(li, &fd, O_RDONLY))
1531 return (0);
1532
1533 ret = atomicio(read, fd, &last, sizeof(last));
1534 close(fd);
1535
1536 switch (ret) {
1537 case 0:
1538 memset(&last, '\0', sizeof(last));
1539 /* FALLTHRU */
1540 case sizeof(last):
1541 lastlog_populate_entry(li, &last);
1542 return (1);
1543 case -1:
1544 error("%s: Error reading from %s: %s", __func__,
1545 LASTLOG_FILE, strerror(errno));
1546 return (0);
1547 default:
1548 error("%s: Error reading from %s: Expecting %d, got %d",
1549 __func__, LASTLOG_FILE, sizeof(last), ret);
1550 return (0);
1551 }
1552
1553 /* NOTREACHED */
1554 return (0);
1555}
1556#endif /* USE_LASTLOG */
| 868 UTMP_FILE, strerror(errno));
869
870 (void)close(fd);
871 return 1;
872 } else {
873 return 0;
874 }
875}
876# endif /* UTMP_USE_LIBRARY */
877
878static int
879utmp_perform_login(struct logininfo *li)
880{
881 struct utmp ut;
882
883 construct_utmp(li, &ut);
884# ifdef UTMP_USE_LIBRARY
885 if (!utmp_write_library(li, &ut)) {
886 logit("utmp_perform_login: utmp_write_library() failed");
887 return 0;
888 }
889# else
890 if (!utmp_write_direct(li, &ut)) {
891 logit("utmp_perform_login: utmp_write_direct() failed");
892 return 0;
893 }
894# endif
895 return 1;
896}
897
898
899static int
900utmp_perform_logout(struct logininfo *li)
901{
902 struct utmp ut;
903
904 construct_utmp(li, &ut);
905# ifdef UTMP_USE_LIBRARY
906 if (!utmp_write_library(li, &ut)) {
907 logit("utmp_perform_logout: utmp_write_library() failed");
908 return 0;
909 }
910# else
911 if (!utmp_write_direct(li, &ut)) {
912 logit("utmp_perform_logout: utmp_write_direct() failed");
913 return 0;
914 }
915# endif
916 return 1;
917}
918
919
920int
921utmp_write_entry(struct logininfo *li)
922{
923 switch(li->type) {
924 case LTYPE_LOGIN:
925 return utmp_perform_login(li);
926
927 case LTYPE_LOGOUT:
928 return utmp_perform_logout(li);
929
930 default:
931 logit("utmp_write_entry: invalid type field");
932 return 0;
933 }
934}
935#endif /* USE_UTMP */
936
937
938/**
939 ** Low-level utmpx functions
940 **/
941
942/* not much point if we don't want utmpx entries */
943#ifdef USE_UTMPX
944
945/* if we have the wherewithall, use pututxline etc. */
946# if !defined(DISABLE_PUTUTXLINE) && defined(HAVE_SETUTXENT) && \
947 defined(HAVE_PUTUTXLINE)
948# define UTMPX_USE_LIBRARY
949# endif
950
951
952/* write a utmpx entry with the system's help (pututxline() and pals) */
953# ifdef UTMPX_USE_LIBRARY
954static int
955utmpx_write_library(struct logininfo *li, struct utmpx *utx)
956{
957 setutxent();
958 pututxline(utx);
959
960# ifdef HAVE_ENDUTXENT
961 endutxent();
962# endif
963 return 1;
964}
965
966# else /* UTMPX_USE_LIBRARY */
967
968/* write a utmp entry direct to the file */
969static int
970utmpx_write_direct(struct logininfo *li, struct utmpx *utx)
971{
972 logit("utmpx_write_direct: not implemented!");
973 return 0;
974}
975# endif /* UTMPX_USE_LIBRARY */
976
977static int
978utmpx_perform_login(struct logininfo *li)
979{
980 struct utmpx utx;
981
982 construct_utmpx(li, &utx);
983# ifdef UTMPX_USE_LIBRARY
984 if (!utmpx_write_library(li, &utx)) {
985 logit("utmpx_perform_login: utmp_write_library() failed");
986 return 0;
987 }
988# else
989 if (!utmpx_write_direct(li, &ut)) {
990 logit("utmpx_perform_login: utmp_write_direct() failed");
991 return 0;
992 }
993# endif
994 return 1;
995}
996
997
998static int
999utmpx_perform_logout(struct logininfo *li)
1000{
1001 struct utmpx utx;
1002
1003 construct_utmpx(li, &utx);
1004# ifdef HAVE_ID_IN_UTMPX
1005 line_abbrevname(utx.ut_id, li->line, sizeof(utx.ut_id));
1006# endif
1007# ifdef HAVE_TYPE_IN_UTMPX
1008 utx.ut_type = DEAD_PROCESS;
1009# endif
1010
1011# ifdef UTMPX_USE_LIBRARY
1012 utmpx_write_library(li, &utx);
1013# else
1014 utmpx_write_direct(li, &utx);
1015# endif
1016 return 1;
1017}
1018
1019int
1020utmpx_write_entry(struct logininfo *li)
1021{
1022 switch(li->type) {
1023 case LTYPE_LOGIN:
1024 return utmpx_perform_login(li);
1025 case LTYPE_LOGOUT:
1026 return utmpx_perform_logout(li);
1027 default:
1028 logit("utmpx_write_entry: invalid type field");
1029 return 0;
1030 }
1031}
1032#endif /* USE_UTMPX */
1033
1034
1035/**
1036 ** Low-level wtmp functions
1037 **/
1038
1039#ifdef USE_WTMP
1040
1041/* write a wtmp entry direct to the end of the file */
1042/* This is a slight modification of code in OpenBSD's logwtmp.c */
1043static int
1044wtmp_write(struct logininfo *li, struct utmp *ut)
1045{
1046 struct stat buf;
1047 int fd, ret = 1;
1048
1049 if ((fd = open(WTMP_FILE, O_WRONLY|O_APPEND, 0)) < 0) {
1050 logit("wtmp_write: problem writing %s: %s",
1051 WTMP_FILE, strerror(errno));
1052 return 0;
1053 }
1054 if (fstat(fd, &buf) == 0)
1055 if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut)) {
1056 ftruncate(fd, buf.st_size);
1057 logit("wtmp_write: problem writing %s: %s",
1058 WTMP_FILE, strerror(errno));
1059 ret = 0;
1060 }
1061 (void)close(fd);
1062 return ret;
1063}
1064
1065static int
1066wtmp_perform_login(struct logininfo *li)
1067{
1068 struct utmp ut;
1069
1070 construct_utmp(li, &ut);
1071 return wtmp_write(li, &ut);
1072}
1073
1074
1075static int
1076wtmp_perform_logout(struct logininfo *li)
1077{
1078 struct utmp ut;
1079
1080 construct_utmp(li, &ut);
1081 return wtmp_write(li, &ut);
1082}
1083
1084
1085int
1086wtmp_write_entry(struct logininfo *li)
1087{
1088 switch(li->type) {
1089 case LTYPE_LOGIN:
1090 return wtmp_perform_login(li);
1091 case LTYPE_LOGOUT:
1092 return wtmp_perform_logout(li);
1093 default:
1094 logit("wtmp_write_entry: invalid type field");
1095 return 0;
1096 }
1097}
1098
1099
1100/* Notes on fetching login data from wtmp/wtmpx
1101 *
1102 * Logouts are usually recorded with (amongst other things) a blank
1103 * username on a given tty line. However, some systems (HP-UX is one)
1104 * leave all fields set, but change the ut_type field to DEAD_PROCESS.
1105 *
1106 * Since we're only looking for logins here, we know that the username
1107 * must be set correctly. On systems that leave it in, we check for
1108 * ut_type==USER_PROCESS (indicating a login.)
1109 *
1110 * Portability: Some systems may set something other than USER_PROCESS
1111 * to indicate a login process. I don't know of any as I write. Also,
1112 * it's possible that some systems may both leave the username in
1113 * place and not have ut_type.
1114 */
1115
1116/* return true if this wtmp entry indicates a login */
1117static int
1118wtmp_islogin(struct logininfo *li, struct utmp *ut)
1119{
1120 if (strncmp(li->username, ut->ut_name,
1121 MIN_SIZEOF(li->username, ut->ut_name)) == 0) {
1122# ifdef HAVE_TYPE_IN_UTMP
1123 if (ut->ut_type & USER_PROCESS)
1124 return 1;
1125# else
1126 return 1;
1127# endif
1128 }
1129 return 0;
1130}
1131
1132int
1133wtmp_get_entry(struct logininfo *li)
1134{
1135 struct stat st;
1136 struct utmp ut;
1137 int fd, found=0;
1138
1139 /* Clear the time entries in our logininfo */
1140 li->tv_sec = li->tv_usec = 0;
1141
1142 if ((fd = open(WTMP_FILE, O_RDONLY)) < 0) {
1143 logit("wtmp_get_entry: problem opening %s: %s",
1144 WTMP_FILE, strerror(errno));
1145 return 0;
1146 }
1147 if (fstat(fd, &st) != 0) {
1148 logit("wtmp_get_entry: couldn't stat %s: %s",
1149 WTMP_FILE, strerror(errno));
1150 close(fd);
1151 return 0;
1152 }
1153
1154 /* Seek to the start of the last struct utmp */
1155 if (lseek(fd, -(off_t)sizeof(struct utmp), SEEK_END) == -1) {
1156 /* Looks like we've got a fresh wtmp file */
1157 close(fd);
1158 return 0;
1159 }
1160
1161 while (!found) {
1162 if (atomicio(read, fd, &ut, sizeof(ut)) != sizeof(ut)) {
1163 logit("wtmp_get_entry: read of %s failed: %s",
1164 WTMP_FILE, strerror(errno));
1165 close (fd);
1166 return 0;
1167 }
1168 if ( wtmp_islogin(li, &ut) ) {
1169 found = 1;
1170 /* We've already checked for a time in struct
1171 * utmp, in login_getlast(). */
1172# ifdef HAVE_TIME_IN_UTMP
1173 li->tv_sec = ut.ut_time;
1174# else
1175# if HAVE_TV_IN_UTMP
1176 li->tv_sec = ut.ut_tv.tv_sec;
1177# endif
1178# endif
1179 line_fullname(li->line, ut.ut_line,
1180 MIN_SIZEOF(li->line, ut.ut_line));
1181# ifdef HAVE_HOST_IN_UTMP
1182 strlcpy(li->hostname, ut.ut_host,
1183 MIN_SIZEOF(li->hostname, ut.ut_host));
1184# endif
1185 continue;
1186 }
1187 /* Seek back 2 x struct utmp */
1188 if (lseek(fd, -(off_t)(2 * sizeof(struct utmp)), SEEK_CUR) == -1) {
1189 /* We've found the start of the file, so quit */
1190 close (fd);
1191 return 0;
1192 }
1193 }
1194
1195 /* We found an entry. Tidy up and return */
1196 close(fd);
1197 return 1;
1198}
1199# endif /* USE_WTMP */
1200
1201
1202/**
1203 ** Low-level wtmpx functions
1204 **/
1205
1206#ifdef USE_WTMPX
1207/* write a wtmpx entry direct to the end of the file */
1208/* This is a slight modification of code in OpenBSD's logwtmp.c */
1209static int
1210wtmpx_write(struct logininfo *li, struct utmpx *utx)
1211{
1212#ifndef HAVE_UPDWTMPX
1213 struct stat buf;
1214 int fd, ret = 1;
1215
1216 if ((fd = open(WTMPX_FILE, O_WRONLY|O_APPEND, 0)) < 0) {
1217 logit("wtmpx_write: problem opening %s: %s",
1218 WTMPX_FILE, strerror(errno));
1219 return 0;
1220 }
1221
1222 if (fstat(fd, &buf) == 0)
1223 if (atomicio(vwrite, fd, utx, sizeof(*utx)) != sizeof(*utx)) {
1224 ftruncate(fd, buf.st_size);
1225 logit("wtmpx_write: problem writing %s: %s",
1226 WTMPX_FILE, strerror(errno));
1227 ret = 0;
1228 }
1229 (void)close(fd);
1230
1231 return ret;
1232#else
1233 updwtmpx(WTMPX_FILE, utx);
1234 return 1;
1235#endif
1236}
1237
1238
1239static int
1240wtmpx_perform_login(struct logininfo *li)
1241{
1242 struct utmpx utx;
1243
1244 construct_utmpx(li, &utx);
1245 return wtmpx_write(li, &utx);
1246}
1247
1248
1249static int
1250wtmpx_perform_logout(struct logininfo *li)
1251{
1252 struct utmpx utx;
1253
1254 construct_utmpx(li, &utx);
1255 return wtmpx_write(li, &utx);
1256}
1257
1258
1259int
1260wtmpx_write_entry(struct logininfo *li)
1261{
1262 switch(li->type) {
1263 case LTYPE_LOGIN:
1264 return wtmpx_perform_login(li);
1265 case LTYPE_LOGOUT:
1266 return wtmpx_perform_logout(li);
1267 default:
1268 logit("wtmpx_write_entry: invalid type field");
1269 return 0;
1270 }
1271}
1272
1273/* Please see the notes above wtmp_islogin() for information about the
1274 next two functions */
1275
1276/* Return true if this wtmpx entry indicates a login */
1277static int
1278wtmpx_islogin(struct logininfo *li, struct utmpx *utx)
1279{
1280 if ( strncmp(li->username, utx->ut_name,
1281 MIN_SIZEOF(li->username, utx->ut_name)) == 0 ) {
1282# ifdef HAVE_TYPE_IN_UTMPX
1283 if (utx->ut_type == USER_PROCESS)
1284 return 1;
1285# else
1286 return 1;
1287# endif
1288 }
1289 return 0;
1290}
1291
1292
1293int
1294wtmpx_get_entry(struct logininfo *li)
1295{
1296 struct stat st;
1297 struct utmpx utx;
1298 int fd, found=0;
1299
1300 /* Clear the time entries */
1301 li->tv_sec = li->tv_usec = 0;
1302
1303 if ((fd = open(WTMPX_FILE, O_RDONLY)) < 0) {
1304 logit("wtmpx_get_entry: problem opening %s: %s",
1305 WTMPX_FILE, strerror(errno));
1306 return 0;
1307 }
1308 if (fstat(fd, &st) != 0) {
1309 logit("wtmpx_get_entry: couldn't stat %s: %s",
1310 WTMPX_FILE, strerror(errno));
1311 close(fd);
1312 return 0;
1313 }
1314
1315 /* Seek to the start of the last struct utmpx */
1316 if (lseek(fd, -(off_t)sizeof(struct utmpx), SEEK_END) == -1 ) {
1317 /* probably a newly rotated wtmpx file */
1318 close(fd);
1319 return 0;
1320 }
1321
1322 while (!found) {
1323 if (atomicio(read, fd, &utx, sizeof(utx)) != sizeof(utx)) {
1324 logit("wtmpx_get_entry: read of %s failed: %s",
1325 WTMPX_FILE, strerror(errno));
1326 close (fd);
1327 return 0;
1328 }
1329 /* Logouts are recorded as a blank username on a particular line.
1330 * So, we just need to find the username in struct utmpx */
1331 if ( wtmpx_islogin(li, &utx) ) {
1332 found = 1;
1333# ifdef HAVE_TV_IN_UTMPX
1334 li->tv_sec = utx.ut_tv.tv_sec;
1335# else
1336# ifdef HAVE_TIME_IN_UTMPX
1337 li->tv_sec = utx.ut_time;
1338# endif
1339# endif
1340 line_fullname(li->line, utx.ut_line, sizeof(li->line));
1341# ifdef HAVE_HOST_IN_UTMPX
1342 strlcpy(li->hostname, utx.ut_host,
1343 MIN_SIZEOF(li->hostname, utx.ut_host));
1344# endif
1345 continue;
1346 }
1347 if (lseek(fd, -(off_t)(2 * sizeof(struct utmpx)), SEEK_CUR) == -1) {
1348 close (fd);
1349 return 0;
1350 }
1351 }
1352
1353 close(fd);
1354 return 1;
1355}
1356#endif /* USE_WTMPX */
1357
1358/**
1359 ** Low-level libutil login() functions
1360 **/
1361
1362#ifdef USE_LOGIN
1363static int
1364syslogin_perform_login(struct logininfo *li)
1365{
1366 struct utmp *ut;
1367
1368 if (! (ut = (struct utmp *)malloc(sizeof(*ut)))) {
1369 logit("syslogin_perform_login: couldn't malloc()");
1370 return 0;
1371 }
1372 construct_utmp(li, ut);
1373 login(ut);
1374 free(ut);
1375
1376 return 1;
1377}
1378
1379static int
1380syslogin_perform_logout(struct logininfo *li)
1381{
1382# ifdef HAVE_LOGOUT
1383 char line[UT_LINESIZE];
1384
1385 (void)line_stripname(line, li->line, sizeof(line));
1386
1387 if (!logout(line)) {
1388 logit("syslogin_perform_logout: logout() returned an error");
1389# ifdef HAVE_LOGWTMP
1390 } else {
1391 logwtmp(line, "", "");
1392# endif
1393 }
1394 /* FIXME: (ATL - if the need arises) What to do if we have
1395 * login, but no logout? what if logout but no logwtmp? All
1396 * routines are in libutil so they should all be there,
1397 * but... */
1398# endif
1399 return 1;
1400}
1401
1402int
1403syslogin_write_entry(struct logininfo *li)
1404{
1405 switch (li->type) {
1406 case LTYPE_LOGIN:
1407 return syslogin_perform_login(li);
1408 case LTYPE_LOGOUT:
1409 return syslogin_perform_logout(li);
1410 default:
1411 logit("syslogin_write_entry: Invalid type field");
1412 return 0;
1413 }
1414}
1415#endif /* USE_LOGIN */
1416
1417/* end of file log-syslogin.c */
1418
1419/**
1420 ** Low-level lastlog functions
1421 **/
1422
1423#ifdef USE_LASTLOG
1424#define LL_FILE 1
1425#define LL_DIR 2
1426#define LL_OTHER 3
1427
1428static void
1429lastlog_construct(struct logininfo *li, struct lastlog *last)
1430{
1431 /* clear the structure */
1432 memset(last, '\0', sizeof(*last));
1433
1434 (void)line_stripname(last->ll_line, li->line, sizeof(last->ll_line));
1435 strlcpy(last->ll_host, li->hostname,
1436 MIN_SIZEOF(last->ll_host, li->hostname));
1437 last->ll_time = li->tv_sec;
1438}
1439
1440static int
1441lastlog_filetype(char *filename)
1442{
1443 struct stat st;
1444
1445 if (stat(LASTLOG_FILE, &st) != 0) {
1446 logit("lastlog_perform_login: Couldn't stat %s: %s", LASTLOG_FILE,
1447 strerror(errno));
1448 return 0;
1449 }
1450 if (S_ISDIR(st.st_mode))
1451 return LL_DIR;
1452 else if (S_ISREG(st.st_mode))
1453 return LL_FILE;
1454 else
1455 return LL_OTHER;
1456}
1457
1458
1459/* open the file (using filemode) and seek to the login entry */
1460static int
1461lastlog_openseek(struct logininfo *li, int *fd, int filemode)
1462{
1463 off_t offset;
1464 int type;
1465 char lastlog_file[1024];
1466
1467 type = lastlog_filetype(LASTLOG_FILE);
1468 switch (type) {
1469 case LL_FILE:
1470 strlcpy(lastlog_file, LASTLOG_FILE, sizeof(lastlog_file));
1471 break;
1472 case LL_DIR:
1473 snprintf(lastlog_file, sizeof(lastlog_file), "%s/%s",
1474 LASTLOG_FILE, li->username);
1475 break;
1476 default:
1477 logit("lastlog_openseek: %.100s is not a file or directory!",
1478 LASTLOG_FILE);
1479 return 0;
1480 }
1481
1482 *fd = open(lastlog_file, filemode, 0600);
1483 if ( *fd < 0) {
1484 debug("lastlog_openseek: Couldn't open %s: %s",
1485 lastlog_file, strerror(errno));
1486 return 0;
1487 }
1488
1489 if (type == LL_FILE) {
1490 /* find this uid's offset in the lastlog file */
1491 offset = (off_t) ((long)li->uid * sizeof(struct lastlog));
1492
1493 if ( lseek(*fd, offset, SEEK_SET) != offset ) {
1494 logit("lastlog_openseek: %s->lseek(): %s",
1495 lastlog_file, strerror(errno));
1496 return 0;
1497 }
1498 }
1499
1500 return 1;
1501}
1502
1503static int
1504lastlog_perform_login(struct logininfo *li)
1505{
1506 struct lastlog last;
1507 int fd;
1508
1509 /* create our struct lastlog */
1510 lastlog_construct(li, &last);
1511
1512 if (!lastlog_openseek(li, &fd, O_RDWR|O_CREAT))
1513 return(0);
1514
1515 /* write the entry */
1516 if (atomicio(vwrite, fd, &last, sizeof(last)) != sizeof(last)) {
1517 close(fd);
1518 logit("lastlog_write_filemode: Error writing to %s: %s",
1519 LASTLOG_FILE, strerror(errno));
1520 return 0;
1521 }
1522
1523 close(fd);
1524 return 1;
1525}
1526
1527int
1528lastlog_write_entry(struct logininfo *li)
1529{
1530 switch(li->type) {
1531 case LTYPE_LOGIN:
1532 return lastlog_perform_login(li);
1533 default:
1534 logit("lastlog_write_entry: Invalid type field");
1535 return 0;
1536 }
1537}
1538
1539static void
1540lastlog_populate_entry(struct logininfo *li, struct lastlog *last)
1541{
1542 line_fullname(li->line, last->ll_line, sizeof(li->line));
1543 strlcpy(li->hostname, last->ll_host,
1544 MIN_SIZEOF(li->hostname, last->ll_host));
1545 li->tv_sec = last->ll_time;
1546}
1547
1548int
1549lastlog_get_entry(struct logininfo *li)
1550{
1551 struct lastlog last;
1552 int fd, ret;
1553
1554 if (!lastlog_openseek(li, &fd, O_RDONLY))
1555 return (0);
1556
1557 ret = atomicio(read, fd, &last, sizeof(last));
1558 close(fd);
1559
1560 switch (ret) {
1561 case 0:
1562 memset(&last, '\0', sizeof(last));
1563 /* FALLTHRU */
1564 case sizeof(last):
1565 lastlog_populate_entry(li, &last);
1566 return (1);
1567 case -1:
1568 error("%s: Error reading from %s: %s", __func__,
1569 LASTLOG_FILE, strerror(errno));
1570 return (0);
1571 default:
1572 error("%s: Error reading from %s: Expecting %d, got %d",
1573 __func__, LASTLOG_FILE, sizeof(last), ret);
1574 return (0);
1575 }
1576
1577 /* NOTREACHED */
1578 return (0);
1579}
1580#endif /* USE_LASTLOG */
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