summaryrefslogtreecommitdiffstats
path: root/modules/pam_lastlog/pam_lastlog.c
blob: 1a796b99e213ed10c954374cdc386ffadd99b119 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
/* pam_lastlog module */

/*
 * Written by Andrew Morgan <morgan@linux.kernel.org> 1996/3/11
 *
 * This module does the necessary work to display the last login
 * time+date for this user, it then updates this entry for the
 * present (login) service.
 */

#include "config.h"

#include <fcntl.h>
#include <time.h>
#include <errno.h>
#ifdef HAVE_UTMP_H
# include <utmp.h>
#else
# include <lastlog.h>
#endif
#include <pwd.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <syslog.h>
#include <unistd.h>

#if defined(hpux) || defined(sunos) || defined(solaris)
# ifndef _PATH_LASTLOG
#  define _PATH_LASTLOG "/usr/adm/lastlog"
# endif /* _PATH_LASTLOG */
# ifndef UT_HOSTSIZE
#  define UT_HOSTSIZE 16
# endif /* UT_HOSTSIZE */
# ifndef UT_LINESIZE
#  define UT_LINESIZE 12
# endif /* UT_LINESIZE */
#endif
#if defined(hpux)
struct lastlog {
    time_t  ll_time;
    char    ll_line[UT_LINESIZE];
    char    ll_host[UT_HOSTSIZE];            /* same as in utmp */
};
#endif /* hpux */

#ifndef _PATH_BTMP
# define _PATH_BTMP "/var/log/btmp"
#endif

/* XXX - time before ignoring lock. Is 1 sec enough? */
#define LASTLOG_IGNORE_LOCK_TIME     1

#define DEFAULT_HOST     ""  /* "[no.where]" */
#define DEFAULT_TERM     ""  /* "tt???" */

#define DEFAULT_INACTIVE_DAYS 90
#define MAX_INACTIVE_DAYS 100000

/*
 * here, we make a definition for the externally accessible function
 * in this file (this definition is required for static a module
 * but strongly encouraged generally) it is used to instruct the
 * modules include file to define the function prototypes.
 */

#define PAM_SM_SESSION
#define PAM_SM_AUTH
#define PAM_SM_ACCOUNT

#include <security/pam_modules.h>
#include <security/_pam_macros.h>
#include <security/pam_modutil.h>
#include <security/pam_ext.h>

/* argument parsing */

#define LASTLOG_DATE        01  /* display the date of the last login */
#define LASTLOG_HOST        02  /* display the last host used (if set) */
#define LASTLOG_LINE        04  /* display the last terminal used */
#define LASTLOG_NEVER      010  /* display a welcome message for first login */
#define LASTLOG_DEBUG      020  /* send info to syslog(3) */
#define LASTLOG_QUIET      040  /* keep quiet about things */
#define LASTLOG_WTMP      0100  /* log to wtmp as well as lastlog */
#define LASTLOG_BTMP      0200  /* display failed login info from btmp */
#define LASTLOG_UPDATE    0400  /* update the lastlog and wtmp files (default) */

static int
_pam_auth_parse(pam_handle_t *pamh, int flags, int argc, const char **argv,
    time_t *inactive)
{
    int ctrl = 0;

    *inactive = DEFAULT_INACTIVE_DAYS;

    /* does the appliction require quiet? */
    if (flags & PAM_SILENT) {
	ctrl |= LASTLOG_QUIET;
    }

    /* step through arguments */
    for (; argc-- > 0; ++argv) {
        char *ep = NULL;
        long l;

	if (!strcmp(*argv,"debug")) {
	    ctrl |= LASTLOG_DEBUG;
	} else if (!strcmp(*argv,"silent")) {
	    ctrl |= LASTLOG_QUIET;
	} else if (!strncmp(*argv,"inactive=", 9)) {
            l = strtol(*argv+9, &ep, 10);
            if (ep != *argv+9 && l > 0 && l < MAX_INACTIVE_DAYS)
                *inactive = l;
            else {
                pam_syslog(pamh, LOG_ERR, "bad option value: %s", *argv);
            }
	} else {
	    pam_syslog(pamh, LOG_ERR, "unknown option: %s", *argv);
	}
    }

    D(("ctrl = %o", ctrl));
    return ctrl;
}

static int
_pam_session_parse(pam_handle_t *pamh, int flags, int argc, const char **argv)
{
    int ctrl=(LASTLOG_DATE|LASTLOG_HOST|LASTLOG_LINE|LASTLOG_WTMP|LASTLOG_UPDATE);

    /* does the appliction require quiet? */
    if (flags & PAM_SILENT) {
	ctrl |= LASTLOG_QUIET;
    }

    /* step through arguments */
    for (; argc-- > 0; ++argv) {

	/* generic options */

	if (!strcmp(*argv,"debug")) {
	    ctrl |= LASTLOG_DEBUG;
	} else if (!strcmp(*argv,"nodate")) {
	    ctrl &= ~LASTLOG_DATE;
	} else if (!strcmp(*argv,"noterm")) {
	    ctrl &= ~LASTLOG_LINE;
	} else if (!strcmp(*argv,"nohost")) {
	    ctrl &= ~LASTLOG_HOST;
	} else if (!strcmp(*argv,"silent")) {
	    ctrl |= LASTLOG_QUIET;
	} else if (!strcmp(*argv,"never")) {
	    ctrl |= LASTLOG_NEVER;
	} else if (!strcmp(*argv,"nowtmp")) {
	    ctrl &= ~LASTLOG_WTMP;
	} else if (!strcmp(*argv,"noupdate")) {
	    ctrl &= ~(LASTLOG_WTMP|LASTLOG_UPDATE);
	} else if (!strcmp(*argv,"showfailed")) {
	    ctrl |= LASTLOG_BTMP;
	} else {
	    pam_syslog(pamh, LOG_ERR, "unknown option: %s", *argv);
	}
    }

    D(("ctrl = %o", ctrl));
    return ctrl;
}

static const char *
get_tty(pam_handle_t *pamh)
{
    const void *void_terminal_line = NULL;
    const char *terminal_line;

    if (pam_get_item(pamh, PAM_TTY, &void_terminal_line) != PAM_SUCCESS
	|| void_terminal_line == NULL) {
	terminal_line = DEFAULT_TERM;
    } else {
	terminal_line = void_terminal_line;
    }
    if (!strncmp("/dev/", terminal_line, 5)) {
	/* strip leading "/dev/" from tty. */
	terminal_line += 5;
    }
    D(("terminal = %s", terminal_line));
    return terminal_line;
}

static int
last_login_open(pam_handle_t *pamh, int announce, uid_t uid)
{
    int last_fd;

    /* obtain the last login date and all the relevant info */
    last_fd = open(_PATH_LASTLOG, announce&LASTLOG_UPDATE ? O_RDWR : O_RDONLY);
    if (last_fd < 0) {
        if (errno == ENOENT && (announce & LASTLOG_UPDATE)) {
	     last_fd = open(_PATH_LASTLOG, O_RDWR|O_CREAT,
                            S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
             if (last_fd < 0) {
	          pam_syslog(pamh, LOG_ERR,
                             "unable to create %s: %m", _PATH_LASTLOG);
		  D(("unable to create %s file", _PATH_LASTLOG));
		  return -1;
	     }
	     pam_syslog(pamh, LOG_NOTICE,
			"file %s created", _PATH_LASTLOG);
	     D(("file %s created", _PATH_LASTLOG));
	} else {
	  pam_syslog(pamh, LOG_ERR, "unable to open %s: %m", _PATH_LASTLOG);
	  D(("unable to open %s file", _PATH_LASTLOG));
	  return -1;
	}
    }

    if (lseek(last_fd, sizeof(struct lastlog) * (off_t) uid, SEEK_SET) < 0) {
	pam_syslog(pamh, LOG_ERR, "failed to lseek %s: %m", _PATH_LASTLOG);
	D(("unable to lseek %s file", _PATH_LASTLOG));
        close(last_fd);
	return -1;
    }

    return last_fd;
}


static int
last_login_read(pam_handle_t *pamh, int announce, int last_fd, uid_t uid, time_t *lltime)
{
    struct flock last_lock;
    struct lastlog last_login;
    int retval = PAM_SUCCESS;
    char the_time[256];
    char *date = NULL;
    char *host = NULL;
    char *line = NULL;

    memset(&last_lock, 0, sizeof(last_lock));
    last_lock.l_type = F_RDLCK;
    last_lock.l_whence = SEEK_SET;
    last_lock.l_start = sizeof(last_login) * (off_t) uid;
    last_lock.l_len = sizeof(last_login);

    if (fcntl(last_fd, F_SETLK, &last_lock) < 0) {
        D(("locking %s failed..(waiting a little)", _PATH_LASTLOG));
	pam_syslog(pamh, LOG_WARNING,
		   "file %s is locked/read", _PATH_LASTLOG);
	sleep(LASTLOG_IGNORE_LOCK_TIME);
    }

    if (pam_modutil_read(last_fd, (char *) &last_login,
			 sizeof(last_login)) != sizeof(last_login)) {
        memset(&last_login, 0, sizeof(last_login));
    }

    last_lock.l_type = F_UNLCK;
    (void) fcntl(last_fd, F_SETLK, &last_lock);        /* unlock */

    *lltime = last_login.ll_time;
    if (!last_login.ll_time) {
        if (announce & LASTLOG_DEBUG) {
	    pam_syslog(pamh, LOG_DEBUG,
		       "first login for user with uid %lu",
		       (unsigned long int)uid);
	}
    }

    if (!(announce & LASTLOG_QUIET)) {

	if (last_login.ll_time) {

	    /* we want the date? */
	    if (announce & LASTLOG_DATE) {
	        struct tm *tm, tm_buf;
		time_t ll_time;

		ll_time = last_login.ll_time;
		if ((tm = localtime_r (&ll_time, &tm_buf)) != NULL) {
			strftime (the_time, sizeof (the_time),
		        /* TRANSLATORS: "strftime options for date of last login" */
				  _(" %a %b %e %H:%M:%S %Z %Y"), tm);
			date = the_time;
		}
	    }

	    /* we want & have the host? */
	    if ((announce & LASTLOG_HOST)
		&& (last_login.ll_host[0] != '\0')) {
		/* TRANSLATORS: " from <host>" */
		if (asprintf(&host, _(" from %.*s"), UT_HOSTSIZE,
			     last_login.ll_host) < 0) {
		    pam_syslog(pamh, LOG_CRIT, "out of memory");
		    retval = PAM_BUF_ERR;
		    goto cleanup;
		}
	    }

	    /* we want and have the terminal? */
	    if ((announce & LASTLOG_LINE)
		&& (last_login.ll_line[0] != '\0')) {
		/* TRANSLATORS: " on <terminal>" */
		if (asprintf(&line, _(" on %.*s"), UT_LINESIZE,
			     last_login.ll_line) < 0) {
		    pam_syslog(pamh, LOG_CRIT, "out of memory");
		    retval = PAM_BUF_ERR;
		    goto cleanup;
		}
	    }

	    if (date != NULL || host != NULL || line != NULL)
		    /* TRANSLATORS: "Last login: <date> from <host> on <terminal>" */
		    retval = pam_info(pamh, _("Last login:%s%s%s"),
			      date ? date : "",
			      host ? host : "",
			      line ? line : "");
	} else if (announce & LASTLOG_NEVER) {
		D(("this is the first time this user has logged in"));
		retval = pam_info(pamh, "%s", _("Welcome to your new account!"));
	}
    }

    /* cleanup */
 cleanup:
    memset(&last_login, 0, sizeof(last_login));
    _pam_overwrite(date);
    _pam_overwrite(host);
    _pam_drop(host);
    _pam_overwrite(line);
    _pam_drop(line);

    return retval;
}

static int
last_login_write(pam_handle_t *pamh, int announce, int last_fd,
		 uid_t uid, const char *user)
{
    struct flock last_lock;
    struct lastlog last_login;
    time_t ll_time;
    const void *void_remote_host = NULL;
    const char *remote_host;
    const char *terminal_line;
    int retval = PAM_SUCCESS;

    /* rewind */
    if (lseek(last_fd, sizeof(last_login) * (off_t) uid, SEEK_SET) < 0) {
	pam_syslog(pamh, LOG_ERR, "failed to lseek %s: %m", _PATH_LASTLOG);
	return PAM_SERVICE_ERR;
    }

    memset(&last_login, 0, sizeof(last_login));

    /* set this login date */
    D(("set the most recent login time"));
    (void) time(&ll_time);    /* set the time */
    last_login.ll_time = ll_time;

    /* set the remote host */
    if (pam_get_item(pamh, PAM_RHOST, &void_remote_host) != PAM_SUCCESS
	|| void_remote_host == NULL) {
	remote_host = DEFAULT_HOST;
    } else {
	remote_host = void_remote_host;
    }

    /* copy to last_login */
    strncat(last_login.ll_host, remote_host, sizeof(last_login.ll_host)-1);

    /* set the terminal line */
    terminal_line = get_tty(pamh);

    /* copy to last_login */
    strncat(last_login.ll_line, terminal_line, sizeof(last_login.ll_line)-1);
    terminal_line = NULL;

    D(("locking lastlog file"));

    /* now we try to lock this file-record exclusively; non-blocking */
    memset(&last_lock, 0, sizeof(last_lock));
    last_lock.l_type = F_WRLCK;
    last_lock.l_whence = SEEK_SET;
    last_lock.l_start = sizeof(last_login) * (off_t) uid;
    last_lock.l_len = sizeof(last_login);

    if (fcntl(last_fd, F_SETLK, &last_lock) < 0) {
	D(("locking %s failed..(waiting a little)", _PATH_LASTLOG));
	pam_syslog(pamh, LOG_WARNING, "file %s is locked/write", _PATH_LASTLOG);
        sleep(LASTLOG_IGNORE_LOCK_TIME);
    }

    D(("writing to the lastlog file"));
    if (pam_modutil_write (last_fd, (char *) &last_login,
			   sizeof (last_login)) != sizeof(last_login)) {
	pam_syslog(pamh, LOG_ERR, "failed to write %s: %m", _PATH_LASTLOG);
	retval = PAM_SERVICE_ERR;
    }

    last_lock.l_type = F_UNLCK;
    (void) fcntl(last_fd, F_SETLK, &last_lock);        /* unlock */
    D(("unlocked"));

    if (announce & LASTLOG_WTMP) {
	/* write wtmp entry for user */
	logwtmp(last_login.ll_line, user, remote_host);
    }

    /* cleanup */
    memset(&last_login, 0, sizeof(last_login));

    return retval;
}

static int
last_login_date(pam_handle_t *pamh, int announce, uid_t uid, const char *user, time_t *lltime)
{
    int retval;
    int last_fd;

    /* obtain the last login date and all the relevant info */
    last_fd = last_login_open(pamh, announce, uid);
    if (last_fd < 0) {
        return PAM_SERVICE_ERR;
    }

    retval = last_login_read(pamh, announce, last_fd, uid, lltime);
    if (retval != PAM_SUCCESS)
      {
	close(last_fd);
	D(("error while reading lastlog file"));
	return retval;
      }

    if (announce & LASTLOG_UPDATE) {
	retval = last_login_write(pamh, announce, last_fd, uid, user);
    }

    close(last_fd);
    D(("all done with last login"));

    return retval;
}

static int
last_login_failed(pam_handle_t *pamh, int announce, const char *user, time_t lltime)
{
    int retval;
    int fd;
    struct utmp ut;
    struct utmp utuser;
    int failed = 0;
    char the_time[256];
    char *date = NULL;
    char *host = NULL;
    char *line = NULL;

    if (strlen(user) > UT_NAMESIZE) {
	pam_syslog(pamh, LOG_WARNING, "username too long, output might be inaccurate");
    }

    /* obtain the failed login attempt records from btmp */
    fd = open(_PATH_BTMP, O_RDONLY);
    if (fd < 0) {
        int save_errno = errno;
	pam_syslog(pamh, LOG_ERR, "unable to open %s: %m", _PATH_BTMP);
	D(("unable to open %s file", _PATH_BTMP));
        if (save_errno == ENOENT)
	  return PAM_SUCCESS;
	else
	  return PAM_SERVICE_ERR;
    }

    while ((retval=pam_modutil_read(fd, (void *)&ut,
			 sizeof(ut))) == sizeof(ut)) {
	if (ut.ut_tv.tv_sec >= lltime && strncmp(ut.ut_user, user, UT_NAMESIZE) == 0) {
	    memcpy(&utuser, &ut, sizeof(utuser));
	    failed++;
	}
    }

    if (retval != 0)
	pam_syslog(pamh, LOG_ERR, "corruption detected in %s", _PATH_BTMP);
    retval = PAM_SUCCESS;

    if (failed) {
	/* we want the date? */
	if (announce & LASTLOG_DATE) {
	    struct tm *tm, tm_buf;
	    time_t lf_time;

	    lf_time = utuser.ut_tv.tv_sec;
	    tm = localtime_r (&lf_time, &tm_buf);
	    strftime (the_time, sizeof (the_time),
	        /* TRANSLATORS: "strftime options for date of last login" */
		_(" %a %b %e %H:%M:%S %Z %Y"), tm);

	    date = the_time;
	}

	/* we want & have the host? */
	if ((announce & LASTLOG_HOST)
		&& (utuser.ut_host[0] != '\0')) {
	    /* TRANSLATORS: " from <host>" */
	    if (asprintf(&host, _(" from %.*s"), UT_HOSTSIZE,
		    utuser.ut_host) < 0) {
		pam_syslog(pamh, LOG_CRIT, "out of memory");
		retval = PAM_BUF_ERR;
		goto cleanup;
	    }
	}

	/* we want and have the terminal? */
	if ((announce & LASTLOG_LINE)
		&& (utuser.ut_line[0] != '\0')) {
	    /* TRANSLATORS: " on <terminal>" */
	    if (asprintf(&line, _(" on %.*s"), UT_LINESIZE,
			utuser.ut_line) < 0) {
		pam_syslog(pamh, LOG_CRIT, "out of memory");
		retval = PAM_BUF_ERR;
		goto cleanup;
	    }
	}

	if (line != NULL || date != NULL || host != NULL) {
	    /* TRANSLATORS: "Last failed login: <date> from <host> on <terminal>" */
	    pam_info(pamh, _("Last failed login:%s%s%s"),
			      date ? date : "",
			      host ? host : "",
			      line ? line : "");
	}

	_pam_drop(line);
#if defined HAVE_DNGETTEXT && defined ENABLE_NLS
        retval = asprintf (&line, dngettext(PACKAGE,
		"There was %d failed login attempt since the last successful login.",
		"There were %d failed login attempts since the last successful login.",
		failed),
	    failed);
#else
	if (failed == 1)
	    retval = asprintf(&line,
		_("There was %d failed login attempt since the last successful login."),
		failed);
	else
	    retval = asprintf(&line,
		/* TRANSLATORS: only used if dngettext is not supported */
		_("There were %d failed login attempts since the last successful login."),
		failed);
#endif
	if (retval >= 0)
		retval = pam_info(pamh, "%s", line);
	else {
		retval = PAM_BUF_ERR;
		line = NULL;
	}
    }

cleanup:
    free(host);
    free(line);
    close(fd);
    D(("all done with btmp"));

    return retval;
}

/* --- authentication (locking out inactive users) functions --- */
int
pam_sm_authenticate(pam_handle_t *pamh, int flags,
		    int argc, const char **argv)
{
    int retval, ctrl;
    const char *user = NULL;
    const struct passwd *pwd;
    uid_t uid;
    time_t lltime = 0;
    time_t inactive_days = 0;
    int last_fd;

    /*
     * Lock out the user if he did not login recently enough.
     */

    ctrl = _pam_auth_parse(pamh, flags, argc, argv, &inactive_days);

    /* which user? */

    if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS || user == NULL
        || *user == '\0') {
        pam_syslog(pamh, LOG_ERR, "cannot determine the user's name");
        return PAM_USER_UNKNOWN;
    }

    /* what uid? */

    pwd = pam_modutil_getpwnam (pamh, user);
    if (pwd == NULL) {
        pam_syslog(pamh, LOG_ERR, "user unknown");
	return PAM_USER_UNKNOWN;
    }
    uid = pwd->pw_uid;
    pwd = NULL;                                         /* tidy up */

    if (uid == 0)
	return PAM_SUCCESS;

    /* obtain the last login date and all the relevant info */
    last_fd = last_login_open(pamh, ctrl, uid);
    if (last_fd < 0) {
	return PAM_IGNORE;
    }

    retval = last_login_read(pamh, ctrl|LASTLOG_QUIET, last_fd, uid, &lltime);
    close(last_fd);

    if (retval != PAM_SUCCESS) {
	D(("error while reading lastlog file"));
	return PAM_IGNORE;
    }

    if (lltime == 0) { /* user never logged in before */
        if (ctrl & LASTLOG_DEBUG)
            pam_syslog(pamh, LOG_DEBUG, "user never logged in - pass");
        return PAM_SUCCESS;
    }

    lltime = (time(NULL) - lltime) / (24*60*60);

    if (lltime > inactive_days) {
        pam_syslog(pamh, LOG_INFO, "user %s inactive for %ld days - denied",
		   user, (long) lltime);
        return PAM_AUTH_ERR;
    }

    return PAM_SUCCESS;
}

int
pam_sm_setcred(pam_handle_t *pamh UNUSED, int flags UNUSED,
		    int argc UNUSED, const char **argv UNUSED)
{
    return PAM_SUCCESS;
}

int
pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
		    int argc, const char **argv)
{
    return pam_sm_authenticate(pamh, flags, argc, argv);
}

/* --- session management functions --- */

int
pam_sm_open_session(pam_handle_t *pamh, int flags,
		    int argc, const char **argv)
{
    int retval, ctrl;
    const void *user;
    const struct passwd *pwd;
    uid_t uid;
    time_t lltime = 0;

    /*
     * this module gets the uid of the PAM_USER. Uses it to display
     * last login info and then updates the lastlog for that user.
     */

    ctrl = _pam_session_parse(pamh, flags, argc, argv);

    /* which user? */

    retval = pam_get_item(pamh, PAM_USER, &user);
    if (retval != PAM_SUCCESS || user == NULL || *(const char *)user == '\0') {
	pam_syslog(pamh, LOG_NOTICE, "user unknown");
	return PAM_USER_UNKNOWN;
    }

    /* what uid? */

    pwd = pam_modutil_getpwnam (pamh, user);
    if (pwd == NULL) {
	D(("couldn't identify user %s", user));
	return PAM_USER_UNKNOWN;
    }
    uid = pwd->pw_uid;
    pwd = NULL;                                         /* tidy up */

    /* process the current login attempt (indicate last) */

    retval = last_login_date(pamh, ctrl, uid, user, &lltime);

    if ((ctrl & LASTLOG_BTMP) && retval == PAM_SUCCESS) {
	    retval = last_login_failed(pamh, ctrl, user, lltime);
    }

    /* indicate success or failure */

    uid = -1;                                           /* forget this */

    return retval;
}

int
pam_sm_close_session (pam_handle_t *pamh, int flags,
		      int argc, const char **argv)
{
    const char *terminal_line;

    if (!(_pam_session_parse(pamh, flags, argc, argv) & LASTLOG_WTMP))
	return PAM_SUCCESS;

    terminal_line = get_tty(pamh);

    /* Wipe out utmp logout entry */
    logwtmp(terminal_line, "", "");

    return PAM_SUCCESS;
}

/* end of module definition */