summaryrefslogtreecommitdiff
path: root/source3/auth/pampass.c
blob: 2d7bdcdf6a9fdba79d396704cdefc729ae4aeb48 (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
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
/* 
   Unix SMB/Netbios implementation.
   Version 2.2.
   PAM Password checking
   Copyright (C) Andrew Tridgell 1992-2001
   Copyright (C) John H Terpsta 1999-2001
   Copyright (C) Andrew Bartlett 2001
   Copyright (C) Jeremy Allison 2001
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

/*
 * This module provides PAM based functions for validation of
 * username/password pairs, account managment, session and access control.
 * Note: SMB password checking is done in smbpass.c
 */

#include "includes.h"

extern int DEBUGLEVEL;

#ifdef WITH_PAM

/*******************************************************************
 * Handle PAM authentication 
 * 	- Access, Authentication, Session, Password
 *   Note: See PAM Documentation and refer to local system PAM implementation
 *   which determines what actions/limitations/allowances become affected.
 *********************************************************************/

#include <security/pam_appl.h>

/*
 * Structure used to communicate between the conversation function
 * and the server_login/change password functions.
 */

struct smb_pam_userdata {
	char *PAM_username;
	char *PAM_password;
	char *PAM_newpassword;
};

typedef int (*smb_pam_conv_fn)(int, const struct pam_message **, struct pam_response **, void *appdata_ptr);

/*
 *  Macros to help make life easy
 */
#define COPY_STRING(s) (s) ? strdup(s) : NULL

/*******************************************************************
 PAM error handler.
 *********************************************************************/

static BOOL smb_pam_error_handler(pam_handle_t *pamh, int pam_error, char *msg, int dbglvl)
{

	if( pam_error != PAM_SUCCESS) {
		DEBUG(dbglvl, ("smb_pam_error_handler: PAM: %s : %s\n",
				msg, pam_strerror(pamh, pam_error)));
		return False;
	}
	return True;
}

/*******************************************************************
 This function is a sanity check, to make sure that we NEVER report
 failure as sucess.
*********************************************************************/

static BOOL smb_pam_nt_status_error_handler(pam_handle_t *pamh, int pam_error,
							char *msg, int dbglvl, uint32 *nt_status)
{
	if (smb_pam_error_handler(pamh, pam_error, msg, dbglvl))
		return True;

	if (*nt_status == NT_STATUS_NOPROBLEMO) {
		/* Complain LOUDLY */
		DEBUG(0, ("smb_pam_nt_status_error_handler: PAM: BUG: PAM and NT_STATUS \
error MISMATCH, forcing to NT_STATUS_LOGON_FAILURE"));
		*nt_status = NT_STATUS_LOGON_FAILURE;
	}
	return False;
}

/*
 * PAM conversation function
 * Here we assume (for now, at least) that echo on means login name, and
 * echo off means password.
 */

static int smb_pam_conv(int num_msg,
		    const struct pam_message **msg,
		    struct pam_response **resp,
		    void *appdata_ptr)
{
	int replies = 0;
	struct pam_response *reply = NULL;
	struct smb_pam_userdata *udp = (struct smb_pam_userdata *)appdata_ptr;

	*resp = NULL;

	if (num_msg <= 0)
		return PAM_CONV_ERR;

	/*
	 * Apparantly HPUX has a buggy PAM that doesn't support the
	 * appdata_ptr. Fail if this is the case. JRA.
	 */

	if (udp == NULL) {
		DEBUG(0,("smb_pam_conv: PAM on this system is broken - appdata_ptr == NULL !\n"));
		return PAM_CONV_ERR;
	}

	reply = malloc(sizeof(struct pam_response) * num_msg);
	if (!reply)
		return PAM_CONV_ERR;

	for (replies = 0; replies < num_msg; replies++) {
		switch (msg[replies]->msg_style) {
			case PAM_PROMPT_ECHO_ON:
				reply[replies].resp_retcode = PAM_SUCCESS;
				reply[replies].resp = COPY_STRING(udp->PAM_username);
				/* PAM frees resp */
				break;

			case PAM_PROMPT_ECHO_OFF:
				reply[replies].resp_retcode = PAM_SUCCESS;
				reply[replies].resp = COPY_STRING(udp->PAM_password);
				/* PAM frees resp */
				break;

			case PAM_TEXT_INFO:
				/* fall through */

			case PAM_ERROR_MSG:
				/* ignore it... */
				reply[replies].resp_retcode = PAM_SUCCESS;
				reply[replies].resp = NULL;
				break;

			default:
				/* Must be an error of some sort... */
				free(reply);
				return PAM_CONV_ERR;
		}
	}
	if (reply)
		*resp = reply;
	return PAM_SUCCESS;
}

/*
 * PAM password change conversation function
 * Here we assume (for now, at least) that echo on means login name, and
 * echo off means password.
 */

static int smb_pam_passchange_conv(int num_msg,
				const struct pam_message **msg,
				struct pam_response **resp,
				void *appdata_ptr)
{
	int replies = 0;
	struct pam_response *reply = NULL;
	fstring newpw_prompt;
	fstring repeatpw_prompt;
	char *p = lp_passwd_chat();
	struct smb_pam_userdata *udp = (struct smb_pam_userdata *)appdata_ptr;

	*resp = NULL;

	if (num_msg <= 0)
		return PAM_CONV_ERR;

	/*
	 * Apparantly HPUX has a buggy PAM that doesn't support the
	 * appdata_ptr. Fail if this is the case. JRA.
	 */

	if (udp == NULL) {
		DEBUG(0,("smb_pam_passchange_conv: PAM on this system is broken - appdata_ptr == NULL !\n"));
		return PAM_CONV_ERR;
	}

	/* Get the prompts. We're running as root so we only get 2 prompts. */

	if (!next_token(&p, newpw_prompt, NULL, sizeof(fstring)))
		return PAM_CONV_ERR;
	if (!next_token(&p, repeatpw_prompt, NULL, sizeof(fstring)))
		return PAM_CONV_ERR;

	reply = malloc(sizeof(struct pam_response) * num_msg);
	if (!reply)
		return PAM_CONV_ERR;

	for (replies = 0; replies < num_msg; replies++) {
		switch (msg[replies]->msg_style) {
		case PAM_PROMPT_ECHO_ON:
			DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: Replied: %s\n", msg[replies]->msg));
			reply[replies].resp_retcode = PAM_SUCCESS;
			reply[replies].resp = COPY_STRING(udp->PAM_username);
			/* PAM frees resp */
			break;

		case PAM_PROMPT_ECHO_OFF:
			reply[replies].resp_retcode = PAM_SUCCESS;
			DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: Replied: %s\n", msg[replies]->msg));
			if (ms_fnmatch( newpw_prompt, msg[replies]->msg) == 0) {
				reply[replies].resp = COPY_STRING(udp->PAM_newpassword);
			} else if (ms_fnmatch(repeatpw_prompt, msg[replies]->msg) == 0) {
				reply[replies].resp = COPY_STRING(udp->PAM_newpassword);
			} else {
				DEBUG(3,("smb_pam_passchange_conv: Could not find reply for PAM prompt: %s\n",msg[replies]->msg));
				DEBUG(5,("smb_pam_passchange_conv: Prompts available:\n NewPW: \"%s\"\n \
RepeatPW: \"%s\"\n",newpw_prompt,repeatpw_prompt));
				free(reply);
				reply = NULL;
				return PAM_CONV_ERR;
			}
			/* PAM frees resp */
			break;

		case PAM_TEXT_INFO:
			/* fall through */

		case PAM_ERROR_MSG:
			/* ignore it... */
			reply[replies].resp_retcode = PAM_SUCCESS;
			reply[replies].resp = NULL;
			break;

		default:
			/* Must be an error of some sort... */
			free(reply);
			reply = NULL;
			return PAM_CONV_ERR;
		}
	}

	if (reply)
		*resp = reply;
	return PAM_SUCCESS;
}

/***************************************************************************
 Free up a malloced pam_conv struct.
****************************************************************************/

static void smb_free_pam_conv(struct pam_conv *pconv)
{
	if (pconv)
		safe_free(pconv->appdata_ptr);

	safe_free(pconv);
}

/***************************************************************************
 Allocate a pam_conv struct.
****************************************************************************/

static struct pam_conv *smb_setup_pam_conv(smb_pam_conv_fn smb_pam_conv_fnptr, char *user,
					char *passwd, char *newpass)
{
	struct pam_conv *pconv = (struct pam_conv *)malloc(sizeof(struct pam_conv));
	struct smb_pam_userdata *udp = (struct smb_pam_userdata *)malloc(sizeof(struct smb_pam_userdata));

	if (pconv == NULL || udp == NULL) {
		safe_free(pconv);
		safe_free(udp);
		return NULL;
	}

	udp->PAM_username = user;
	udp->PAM_password = passwd;
	udp->PAM_newpassword = newpass;

	pconv->conv = smb_pam_conv_fnptr;
	pconv->appdata_ptr = (void *)udp;
	return pconv;
}

/* 
 * PAM Closing out cleanup handler
 */

static BOOL smb_pam_end(pam_handle_t *pamh, struct pam_conv *smb_pam_conv_ptr)
{
	int pam_error;

	smb_free_pam_conv(smb_pam_conv_ptr);
       
	if( pamh != NULL ) {
		pam_error = pam_end(pamh, 0);
		if(smb_pam_error_handler(pamh, pam_error, "End Cleanup Failed", 2) == True) {
			DEBUG(4, ("smb_pam_end: PAM: PAM_END OK.\n"));
			return True;
		}
	}
	DEBUG(2,("smb_pam_end: PAM: not initialised"));
	return False;
}

/*
 * Start PAM authentication for specified account
 */

static BOOL smb_pam_start(pam_handle_t **pamh, char *user, char *rhost, struct pam_conv *pconv)
{
	int pam_error;

	*pamh = (pam_handle_t *)NULL;

	DEBUG(4,("smb_pam_start: PAM: Init user: %s\n", user));

	pam_error = pam_start("samba", user, pconv, pamh);
	if( !smb_pam_error_handler(*pamh, pam_error, "Init Failed", 0)) {
		*pamh = (pam_handle_t *)NULL;
		return False;
	}

	if (rhost == NULL) {
		rhost = client_name();
		if (strequal(rhost,"UNKNOWN"))
			rhost = client_addr();
	}

#ifdef PAM_RHOST
	DEBUG(4,("smb_pam_start: PAM: setting rhost to: %s\n", rhost));
	pam_error = pam_set_item(*pamh, PAM_RHOST, rhost);
	if(!smb_pam_error_handler(*pamh, pam_error, "set rhost failed", 0)) {
		smb_pam_end(*pamh, pconv);
		*pamh = (pam_handle_t *)NULL;
		return False;
	}
#endif
#ifdef PAM_TTY
	DEBUG(4,("smb_pam_start: PAM: setting tty\n"));
	pam_error = pam_set_item(*pamh, PAM_TTY, "samba");
	if (!smb_pam_error_handler(*pamh, pam_error, "set tty failed", 0)) {
		smb_pam_end(*pamh, pconv);
		*pamh = (pam_handle_t *)NULL;
		return False;
	}
#endif
	DEBUG(4,("smb_pam_start: PAM: Init passed for user: %s\n", user));
	return True;
}

/*
 * PAM Authentication Handler
 */
static uint32 smb_pam_auth(pam_handle_t *pamh, char *user)
{
	int pam_error;
	uint32 nt_status = NT_STATUS_LOGON_FAILURE;

	/*
	 * To enable debugging set in /etc/pam.d/samba:
	 *	auth required /lib/security/pam_pwdb.so nullok shadow audit
	 */
	
	DEBUG(4,("smb_pam_auth: PAM: Authenticate User: %s\n", user));
	pam_error = pam_authenticate(pamh, PAM_SILENT | lp_null_passwords() ? 0 : PAM_DISALLOW_NULL_AUTHTOK);
	switch( pam_error ){
		case PAM_AUTH_ERR:
			DEBUG(2, ("smb_pam_auth: PAM: Athentication Error for user %s\n", user));
			nt_status = NT_STATUS_WRONG_PASSWORD;
			break;
		case PAM_CRED_INSUFFICIENT:
			DEBUG(2, ("smb_pam_auth: PAM: Insufficient Credentials for user %s\n", user));
			nt_status = NT_STATUS_INSUFFICIENT_LOGON_INFO;
			break;
		case PAM_AUTHINFO_UNAVAIL:
			DEBUG(2, ("smb_pam_auth: PAM: Authentication Information Unavailable for user %s\n", user));
			nt_status = NT_STATUS_LOGON_FAILURE;
			break;
		case PAM_USER_UNKNOWN:
			DEBUG(2, ("smb_pam_auth: PAM: Username %s NOT known to Authentication system\n", user));
			nt_status = NT_STATUS_NO_SUCH_USER;
			break;
		case PAM_MAXTRIES:
			DEBUG(2, ("smb_pam_auth: PAM: One or more authentication modules reports user limit for user %s exceeeded\n", user));
			nt_status = NT_STATUS_REMOTE_SESSION_LIMIT;
			break;
		case PAM_ABORT:
			DEBUG(0, ("smb_pam_auth: PAM: One or more PAM modules failed to load for user %s\n", user));
			nt_status = NT_STATUS_LOGON_FAILURE;
			break;
		case PAM_SUCCESS:
			DEBUG(4, ("smb_pam_auth: PAM: User %s Authenticated OK\n", user));
			nt_status = NT_STATUS_NOPROBLEMO;
			break;
		default:
			DEBUG(0, ("smb_pam_auth: PAM: UNKNOWN ERROR while authenticating user %s\n", user));
			nt_status = NT_STATUS_LOGON_FAILURE;
			break;
	}

	smb_pam_nt_status_error_handler(pamh, pam_error, "Authentication Failure", 2, &nt_status);
	return nt_status;
}

/* 
 * PAM Account Handler
 */
static uint32 smb_pam_account(pam_handle_t *pamh, char * user)
{
	int pam_error;
	uint32 nt_status = NT_STATUS_ACCOUNT_DISABLED;

	DEBUG(4,("smb_pam_account: PAM: Account Management for User: %s\n", user));
	pam_error = pam_acct_mgmt(pamh, PAM_SILENT); /* Is user account enabled? */
	switch( pam_error ) {
		case PAM_AUTHTOK_EXPIRED:
			DEBUG(2, ("smb_pam_account: PAM: User %s is valid but password is expired\n", user));
			nt_status = NT_STATUS_PASSWORD_EXPIRED;
			break;
		case PAM_ACCT_EXPIRED:
			DEBUG(2, ("smb_pam_account: PAM: User %s no longer permitted to access system\n", user));
			nt_status = NT_STATUS_ACCOUNT_EXPIRED;
			break;
		case PAM_AUTH_ERR:
			DEBUG(2, ("smb_pam_account: PAM: There was an authentication error for user %s\n", user));
			nt_status = NT_STATUS_LOGON_FAILURE;
			break;
		case PAM_PERM_DENIED:
			DEBUG(0, ("smb_pam_account: PAM: User %s is NOT permitted to access system at this time\n", user));
			nt_status = NT_STATUS_ACCOUNT_RESTRICTION;
			break;
		case PAM_USER_UNKNOWN:
			DEBUG(0, ("smb_pam_account: PAM: User \"%s\" is NOT known to account management\n", user));
			nt_status = NT_STATUS_NO_SUCH_USER;
			break;
		case PAM_SUCCESS:
			DEBUG(4, ("smb_pam_account: PAM: Account OK for User: %s\n", user));
			nt_status = NT_STATUS_NOPROBLEMO;
			break;
		default:
			nt_status = NT_STATUS_ACCOUNT_DISABLED;
			DEBUG(0, ("smb_pam_account: PAM: UNKNOWN PAM ERROR (%d) during Account Management for User: %s\n", pam_error, user));
			break;
	}

	smb_pam_nt_status_error_handler(pamh, pam_error, "Account Check Failed", 2, &nt_status);
	return nt_status;
}

/*
 * PAM Credential Setting
 */

static uint32 smb_pam_setcred(pam_handle_t *pamh, char * user)
{
	int pam_error;
	uint32 nt_status = NT_STATUS_NO_TOKEN;

	/*
	 * This will allow samba to aquire a kerberos token. And, when
	 * exporting an AFS cell, be able to /write/ to this cell.
	 */

	DEBUG(4,("PAM: Account Management SetCredentials for User: %s\n", user));
	pam_error = pam_setcred(pamh, (PAM_ESTABLISH_CRED|PAM_SILENT)); 
	switch( pam_error ) {
		case PAM_CRED_UNAVAIL:
			DEBUG(0, ("smb_pam_setcred: PAM: Credentials not found for user:%s\n", user ));
			 nt_status = NT_STATUS_NO_TOKEN;
			break;
		case PAM_CRED_EXPIRED:
			DEBUG(0, ("smb_pam_setcred: PAM: Credentials for user: \"%s\" EXPIRED!\n", user ));
			nt_status = NT_STATUS_PASSWORD_EXPIRED;
			break;
		case PAM_USER_UNKNOWN:
			DEBUG(0, ("smb_pam_setcred: PAM: User: \"%s\" is NOT known so can not set credentials!\n", user ));
			nt_status = NT_STATUS_NO_SUCH_USER;
			break;
		case PAM_CRED_ERR:
			DEBUG(0, ("smb_pam_setcred: PAM: Unknown setcredentials error - unable to set credentials for %s\n", user ));
			nt_status = NT_STATUS_LOGON_FAILURE;
			break;
		case PAM_SUCCESS:
			DEBUG(4, ("smb_pam_setcred: PAM: SetCredentials OK for User: %s\n", user));
			nt_status = NT_STATUS_NOPROBLEMO;
			break;
		default:
			DEBUG(0, ("smb_pam_setcred: PAM: UNKNOWN PAM ERROR (%d) during SetCredentials for User: %s\n", pam_error, user));
			nt_status = NT_STATUS_NO_TOKEN;
			break;
	}

	smb_pam_nt_status_error_handler(pamh, pam_error, "Set Credential Failure", 2, &nt_status);
	return nt_status;
}

/*
 * PAM Internal Session Handler
 */
static BOOL smb_internal_pam_session(pam_handle_t *pamh, char *user, char *tty, BOOL flag)
{
	int pam_error;

#ifdef PAM_TTY
	DEBUG(4,("smb_internal_pam_session: PAM: tty set to: %s\n", tty));
	pam_error = pam_set_item(pamh, PAM_TTY, tty);
	if (!smb_pam_error_handler(pamh, pam_error, "set tty failed", 0))
		return False;
#endif

	if (flag) {
		pam_error = pam_open_session(pamh, PAM_SILENT);
		if (!smb_pam_error_handler(pamh, pam_error, "session setup failed", 0))
			return False;
	} else {
		pam_setcred(pamh, (PAM_DELETE_CRED|PAM_SILENT)); /* We don't care if this fails */
		pam_error = pam_close_session(pamh, PAM_SILENT); /* This will probably pick up the error anyway */
		if (!smb_pam_error_handler(pamh, pam_error, "session close failed", 0))
			return False;
	}
	return (True);
}

/*
 * Internal PAM Password Changer.
 */

static BOOL smb_pam_chauthtok(pam_handle_t *pamh, char * user)
{
	int pam_error;

	DEBUG(4,("smb_pam_chauthtok: PAM: Password Change for User: %s\n", user));

	pam_error = pam_chauthtok(pamh, PAM_SILENT); /* Change Password */

	switch( pam_error ) {
	case PAM_AUTHTOK_ERR:
		DEBUG(2, ("PAM: unable to obtain the new authentication token - is password to weak?\n"));
		break;

	/* This doesn't seem to be defined on Solaris. JRA */
#ifdef PAM_AUTHTOK_RECOVER_ERR
	case PAM_AUTHTOK_RECOVER_ERR:
		DEBUG(2, ("PAM: unable to obtain the old authentication token - was the old password wrong?.\n"));
		break;
#endif

	case PAM_AUTHTOK_LOCK_BUSY:
		DEBUG(2, ("PAM: unable to change the authentication token since it is currently locked.\n"));
		break;
	case PAM_AUTHTOK_DISABLE_AGING:
		DEBUG(2, ("PAM: Authentication token aging has been disabled.\n"));
		break;
	case PAM_PERM_DENIED:
		DEBUG(0, ("PAM: Permission denied.\n"));
		break;
	case PAM_TRY_AGAIN:
		DEBUG(0, ("PAM: Could not update all authentication token(s). No authentication tokens were updated.\n"));
		break;
	case PAM_USER_UNKNOWN:
		DEBUG(0, ("PAM: User not known to PAM\n"));
		break;
	case PAM_SUCCESS:
		DEBUG(4, ("PAM: Account OK for User: %s\n", user));
		break;
	default:
		DEBUG(0, ("PAM: UNKNOWN PAM ERROR (%d) for User: %s\n", pam_error, user));
	}
 
	if(!smb_pam_error_handler(pamh, pam_error, "Password Change Failed", 2)) {
		return False;
	}

	/* If this point is reached, the password has changed. */
	return True;
}

/*
 * PAM Externally accessible Session handler
 */

BOOL smb_pam_claim_session(char *user, char *tty, char *rhost)
{
	pam_handle_t *pamh = NULL;
	struct pam_conv *pconv = NULL;

	/* Ignore PAM if told to. */

	if (!lp_obey_pam_restrictions())
		return True;

	if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
		return False;

	if (!smb_pam_start(&pamh, user, rhost, pconv))
		return False;

	if (!smb_internal_pam_session(pamh, user, tty, True)) {
		smb_pam_end(pamh, pconv);
		return False;
	}

	return smb_pam_end(pamh, pconv);
}

/*
 * PAM Externally accessible Session handler
 */

BOOL smb_pam_close_session(char *user, char *tty, char *rhost)
{
	pam_handle_t *pamh = NULL;
	struct pam_conv *pconv = NULL;

	/* Ignore PAM if told to. */

	if (!lp_obey_pam_restrictions())
		return True;

	if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
		return False;

	if (!smb_pam_start(&pamh, user, rhost, pconv))
		return False;

	if (!smb_internal_pam_session(pamh, user, tty, False)) {
		smb_pam_end(pamh, pconv);
		return False;
	}

	return smb_pam_end(pamh, pconv);
}

/*
 * PAM Externally accessible Account handler
 */

uint32 smb_pam_accountcheck(char * user)
{
	uint32 nt_status = NT_STATUS_ACCOUNT_DISABLED;
	pam_handle_t *pamh = NULL;
	struct pam_conv *pconv = NULL;

	/* Ignore PAM if told to. */

	if (!lp_obey_pam_restrictions())
		return NT_STATUS_NOPROBLEMO;

	if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
		return False;

	if (!smb_pam_start(&pamh, user, NULL, pconv))
		return NT_STATUS_ACCOUNT_DISABLED;

	if ((nt_status = smb_pam_account(pamh, user)) != NT_STATUS_NOPROBLEMO)
		DEBUG(0, ("smb_pam_accountcheck: PAM: Account Validation Failed - Rejecting User %s!\n", user));

	smb_pam_end(pamh, pconv);
	return nt_status;
}

/*
 * PAM Password Validation Suite
 */

uint32 smb_pam_passcheck(char * user, char * password)
{
	pam_handle_t *pamh = NULL;
	uint32 nt_status = NT_STATUS_LOGON_FAILURE;
	struct pam_conv *pconv = NULL;

	/*
	 * Note we can't ignore PAM here as this is the only
	 * way of doing auths on plaintext passwords when
	 * compiled --with-pam.
	 */

	if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, password, NULL)) == NULL)
		return NT_STATUS_LOGON_FAILURE;

	if (!smb_pam_start(&pamh, user, NULL, pconv))
		return NT_STATUS_LOGON_FAILURE;

	if ((nt_status = smb_pam_auth(pamh, user)) != NT_STATUS_NOPROBLEMO) {
		DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_auth failed - Rejecting User %s !\n", user));
		smb_pam_end(pamh, pconv);
		return nt_status;
	}

	if ((nt_status = smb_pam_account(pamh, user)) != NT_STATUS_NOPROBLEMO) {
		DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_account failed - Rejecting User %s !\n", user));
		smb_pam_end(pamh, pconv);
		return nt_status;
	}

	if ((nt_status = smb_pam_setcred(pamh, user)) != NT_STATUS_NOPROBLEMO) {
		DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_setcred failed - Rejecting User %s !\n", user));
		smb_pam_end(pamh, pconv);
		return nt_status;
	}

	smb_pam_end(pamh, pconv);
	return nt_status;
}

/*
 * PAM Password Change Suite
 */

BOOL smb_pam_passchange(char * user, char * oldpassword, char * newpassword)
{
	/* Appropriate quantities of root should be obtained BEFORE calling this function */
	struct pam_conv *pconv = NULL;
	pam_handle_t *pamh = NULL;

	if ((pconv = smb_setup_pam_conv(smb_pam_passchange_conv, user, oldpassword, newpassword)) == NULL)
		return False;

	if(!smb_pam_start(&pamh, user, NULL, pconv))
		return False;

	if (!smb_pam_chauthtok(pamh, user)) {
		DEBUG(0, ("smb_pam_passchange: PAM: Password Change Failed for user %s!\n", user));
		smb_pam_end(pamh, pconv);
		return False;
	}

	return smb_pam_end(pamh, pconv);
}

#else

/* If PAM not used, no PAM restrictions on accounts. */
 uint32 smb_pam_accountcheck(char * user)
{
	return NT_STATUS_NOPROBLEMO;
}

/* If PAM not used, also no PAM restrictions on sessions. */
 BOOL smb_pam_claim_session(char *user, char *tty, char *rhost)
{
	return True;
}

/* If PAM not used, also no PAM restrictions on sessions. */
 BOOL smb_pam_close_session(char *in_user, char *tty, char *rhost)
{
	return True;
}
#endif /* WITH_PAM */