source: branches/samba-3.0/source/auth/pampass.c

Last change on this file was 165, checked in by Paul Smedley, 16 years ago

Add 'missing' 3.0.34 diffs
File size: 23.9 KB
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[1]1/*
2 Unix SMB/CIFS implementation.
3 PAM Password checking
4 Copyright (C) Andrew Tridgell 1992-2001
5 Copyright (C) John H Terpsta 1999-2001
6 Copyright (C) Andrew Bartlett 2001
7 Copyright (C) Jeremy Allison 2001
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22*/
23
24/*
25 * This module provides PAM based functions for validation of
26 * username/password pairs, account managment, session and access control.
27 * Note: SMB password checking is done in smbpass.c
28 */
29
30#include "includes.h"
31
32#undef DBGC_CLASS
33#define DBGC_CLASS DBGC_AUTH
34
35#ifdef WITH_PAM
36
37/*******************************************************************
38 * Handle PAM authentication
39 * - Access, Authentication, Session, Password
40 * Note: See PAM Documentation and refer to local system PAM implementation
41 * which determines what actions/limitations/allowances become affected.
42 *********************************************************************/
43
44#include <security/pam_appl.h>
45
46/*
47 * Structure used to communicate between the conversation function
48 * and the server_login/change password functions.
49 */
50
51struct smb_pam_userdata {
52 const char *PAM_username;
53 const char *PAM_password;
54 const char *PAM_newpassword;
55};
56
57typedef int (*smb_pam_conv_fn)(int, const struct pam_message **, struct pam_response **, void *appdata_ptr);
58
59/*
60 * Macros to help make life easy
61 */
62#define COPY_STRING(s) (s) ? SMB_STRDUP(s) : NULL
[165]63#define COPY_FSTRING(s) (s[0]) ? SMB_STRDUP(s) : NULL
[1]64
65/*******************************************************************
66 PAM error handler.
67 *********************************************************************/
68
69static BOOL smb_pam_error_handler(pam_handle_t *pamh, int pam_error, const char *msg, int dbglvl)
70{
71
72 if( pam_error != PAM_SUCCESS) {
73 DEBUG(dbglvl, ("smb_pam_error_handler: PAM: %s : %s\n",
74 msg, pam_strerror(pamh, pam_error)));
75
76 return False;
77 }
78 return True;
79}
80
81/*******************************************************************
82 This function is a sanity check, to make sure that we NEVER report
83 failure as sucess.
84*********************************************************************/
85
86static BOOL smb_pam_nt_status_error_handler(pam_handle_t *pamh, int pam_error,
87 const char *msg, int dbglvl,
88 NTSTATUS *nt_status)
89{
90 *nt_status = pam_to_nt_status(pam_error);
91
92 if (smb_pam_error_handler(pamh, pam_error, msg, dbglvl))
93 return True;
94
95 if (NT_STATUS_IS_OK(*nt_status)) {
96 /* Complain LOUDLY */
97 DEBUG(0, ("smb_pam_nt_status_error_handler: PAM: BUG: PAM and NT_STATUS \
98error MISMATCH, forcing to NT_STATUS_LOGON_FAILURE"));
99 *nt_status = NT_STATUS_LOGON_FAILURE;
100 }
101 return False;
102}
103
104/*
105 * PAM conversation function
106 * Here we assume (for now, at least) that echo on means login name, and
107 * echo off means password.
108 */
109
110static int smb_pam_conv(int num_msg,
111 const struct pam_message **msg,
112 struct pam_response **resp,
113 void *appdata_ptr)
114{
115 int replies = 0;
116 struct pam_response *reply = NULL;
117 struct smb_pam_userdata *udp = (struct smb_pam_userdata *)appdata_ptr;
118
119 *resp = NULL;
120
121 if (num_msg <= 0)
122 return PAM_CONV_ERR;
123
124 /*
125 * Apparantly HPUX has a buggy PAM that doesn't support the
126 * appdata_ptr. Fail if this is the case. JRA.
127 */
128
129 if (udp == NULL) {
130 DEBUG(0,("smb_pam_conv: PAM on this system is broken - appdata_ptr == NULL !\n"));
131 return PAM_CONV_ERR;
132 }
133
134 reply = SMB_MALLOC_ARRAY(struct pam_response, num_msg);
135 if (!reply)
136 return PAM_CONV_ERR;
137
138 memset(reply, '\0', sizeof(struct pam_response) * num_msg);
139
140 for (replies = 0; replies < num_msg; replies++) {
141 switch (msg[replies]->msg_style) {
142 case PAM_PROMPT_ECHO_ON:
143 reply[replies].resp_retcode = PAM_SUCCESS;
144 reply[replies].resp = COPY_STRING(udp->PAM_username);
145 /* PAM frees resp */
146 break;
147
148 case PAM_PROMPT_ECHO_OFF:
149 reply[replies].resp_retcode = PAM_SUCCESS;
150 reply[replies].resp = COPY_STRING(udp->PAM_password);
151 /* PAM frees resp */
152 break;
153
154 case PAM_TEXT_INFO:
155 /* fall through */
156
157 case PAM_ERROR_MSG:
158 /* ignore it... */
159 reply[replies].resp_retcode = PAM_SUCCESS;
160 reply[replies].resp = NULL;
161 break;
162
163 default:
164 /* Must be an error of some sort... */
165 SAFE_FREE(reply);
166 return PAM_CONV_ERR;
167 }
168 }
169 if (reply)
170 *resp = reply;
171 return PAM_SUCCESS;
172}
173
174/*
175 * PAM password change conversation function
176 * Here we assume (for now, at least) that echo on means login name, and
177 * echo off means password.
178 */
179
180static void special_char_sub(char *buf)
181{
182 all_string_sub(buf, "\\n", "", 0);
183 all_string_sub(buf, "\\r", "", 0);
184 all_string_sub(buf, "\\s", " ", 0);
185 all_string_sub(buf, "\\t", "\t", 0);
186}
187
188static void pwd_sub(char *buf, const char *username, const char *oldpass, const char *newpass)
189{
190 fstring_sub(buf, "%u", username);
191 all_string_sub(buf, "%o", oldpass, sizeof(fstring));
192 all_string_sub(buf, "%n", newpass, sizeof(fstring));
193}
194
195
196struct chat_struct {
197 struct chat_struct *next, *prev;
198 fstring prompt;
199 fstring reply;
200};
201
202/**************************************************************
203 Create a linked list containing chat data.
204***************************************************************/
205
206static struct chat_struct *make_pw_chat(const char *p)
207{
208 fstring prompt;
209 fstring reply;
210 struct chat_struct *list = NULL;
211 struct chat_struct *t;
212
213 while (1) {
214 t = SMB_MALLOC_P(struct chat_struct);
215 if (!t) {
216 DEBUG(0,("make_pw_chat: malloc failed!\n"));
217 return NULL;
218 }
219
220 ZERO_STRUCTP(t);
221
222 DLIST_ADD_END(list, t, struct chat_struct*);
223
224 if (!next_token(&p, prompt, NULL, sizeof(fstring)))
225 break;
226
227 if (strequal(prompt,"."))
228 fstrcpy(prompt,"*");
229
230 special_char_sub(prompt);
231 fstrcpy(t->prompt, prompt);
232 strlower_m(t->prompt);
233 trim_char(t->prompt, ' ', ' ');
234
235 if (!next_token(&p, reply, NULL, sizeof(fstring)))
236 break;
237
238 if (strequal(reply,"."))
239 fstrcpy(reply,"");
240
241 special_char_sub(reply);
242 fstrcpy(t->reply, reply);
243 strlower_m(t->reply);
244 trim_char(t->reply, ' ', ' ');
245
246 }
247 return list;
248}
249
250static void free_pw_chat(struct chat_struct *list)
251{
252 while (list) {
253 struct chat_struct *old_head = list;
254 DLIST_REMOVE(list, list);
255 SAFE_FREE(old_head);
256 }
257}
258
259static int smb_pam_passchange_conv(int num_msg,
260 const struct pam_message **msg,
261 struct pam_response **resp,
262 void *appdata_ptr)
263{
264 int replies = 0;
265 struct pam_response *reply = NULL;
266 fstring current_prompt;
267 fstring current_reply;
268 struct smb_pam_userdata *udp = (struct smb_pam_userdata *)appdata_ptr;
269 struct chat_struct *pw_chat= make_pw_chat(lp_passwd_chat());
270 struct chat_struct *t;
271 BOOL found;
272 *resp = NULL;
273
274 DEBUG(10,("smb_pam_passchange_conv: starting converstation for %d messages\n", num_msg));
275
276 if (num_msg <= 0)
277 return PAM_CONV_ERR;
278
279 if (pw_chat == NULL)
280 return PAM_CONV_ERR;
281
282 /*
283 * Apparantly HPUX has a buggy PAM that doesn't support the
284 * appdata_ptr. Fail if this is the case. JRA.
285 */
286
287 if (udp == NULL) {
288 DEBUG(0,("smb_pam_passchange_conv: PAM on this system is broken - appdata_ptr == NULL !\n"));
289 free_pw_chat(pw_chat);
290 return PAM_CONV_ERR;
291 }
292
293 reply = SMB_MALLOC_ARRAY(struct pam_response, num_msg);
294 if (!reply) {
295 DEBUG(0,("smb_pam_passchange_conv: malloc for reply failed!\n"));
296 free_pw_chat(pw_chat);
297 return PAM_CONV_ERR;
298 }
299
300 for (replies = 0; replies < num_msg; replies++) {
301 found = False;
302 DEBUG(10,("smb_pam_passchange_conv: Processing message %d\n", replies));
303 switch (msg[replies]->msg_style) {
304 case PAM_PROMPT_ECHO_ON:
305 DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: PAM said: %s\n", msg[replies]->msg));
306 fstrcpy(current_prompt, msg[replies]->msg);
307 trim_char(current_prompt, ' ', ' ');
308 for (t=pw_chat; t; t=t->next) {
309
310 DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: trying to match |%s| to |%s|\n",
311 t->prompt, current_prompt ));
312
313 if (unix_wild_match(t->prompt, current_prompt)) {
314 fstrcpy(current_reply, t->reply);
315 DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: We sent: %s\n", current_reply));
316 pwd_sub(current_reply, udp->PAM_username, udp->PAM_password, udp->PAM_newpassword);
317#ifdef DEBUG_PASSWORD
318 DEBUG(100,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: We actualy sent: %s\n", current_reply));
319#endif
320 reply[replies].resp_retcode = PAM_SUCCESS;
[165]321 reply[replies].resp = COPY_FSTRING(current_reply);
[1]322 found = True;
323 break;
324 }
325 }
326 /* PAM frees resp */
327 if (!found) {
328 DEBUG(3,("smb_pam_passchange_conv: Could not find reply for PAM prompt: %s\n",msg[replies]->msg));
329 free_pw_chat(pw_chat);
330 SAFE_FREE(reply);
331 return PAM_CONV_ERR;
332 }
333 break;
334
335 case PAM_PROMPT_ECHO_OFF:
336 DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: PAM said: %s\n", msg[replies]->msg));
337 fstrcpy(current_prompt, msg[replies]->msg);
338 trim_char(current_prompt, ' ', ' ');
339 for (t=pw_chat; t; t=t->next) {
340
341 DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: trying to match |%s| to |%s|\n",
342 t->prompt, current_prompt ));
343
344 if (unix_wild_match(t->prompt, current_prompt)) {
345 fstrcpy(current_reply, t->reply);
346 DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: We sent: %s\n", current_reply));
347 pwd_sub(current_reply, udp->PAM_username, udp->PAM_password, udp->PAM_newpassword);
348 reply[replies].resp_retcode = PAM_SUCCESS;
[165]349 reply[replies].resp = COPY_FSTRING(current_reply);
[1]350#ifdef DEBUG_PASSWORD
351 DEBUG(100,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: We actualy sent: %s\n", current_reply));
352#endif
353 found = True;
354 break;
355 }
356 }
357 /* PAM frees resp */
358
359 if (!found) {
360 DEBUG(3,("smb_pam_passchange_conv: Could not find reply for PAM prompt: %s\n",msg[replies]->msg));
361 free_pw_chat(pw_chat);
362 SAFE_FREE(reply);
363 return PAM_CONV_ERR;
364 }
365 break;
366
367 case PAM_TEXT_INFO:
368 /* fall through */
369
370 case PAM_ERROR_MSG:
371 /* ignore it... */
372 reply[replies].resp_retcode = PAM_SUCCESS;
373 reply[replies].resp = NULL;
374 break;
375
376 default:
377 /* Must be an error of some sort... */
378 free_pw_chat(pw_chat);
379 SAFE_FREE(reply);
380 return PAM_CONV_ERR;
381 }
382 }
383
384 free_pw_chat(pw_chat);
385 if (reply)
386 *resp = reply;
387 return PAM_SUCCESS;
388}
389
390/***************************************************************************
391 Free up a malloced pam_conv struct.
392****************************************************************************/
393
394static void smb_free_pam_conv(struct pam_conv *pconv)
395{
396 if (pconv)
397 SAFE_FREE(pconv->appdata_ptr);
398
399 SAFE_FREE(pconv);
400}
401
402/***************************************************************************
403 Allocate a pam_conv struct.
404****************************************************************************/
405
406static struct pam_conv *smb_setup_pam_conv(smb_pam_conv_fn smb_pam_conv_fnptr, const char *user,
407 const char *passwd, const char *newpass)
408{
409 struct pam_conv *pconv = SMB_MALLOC_P(struct pam_conv);
410 struct smb_pam_userdata *udp = SMB_MALLOC_P(struct smb_pam_userdata);
411
412 if (pconv == NULL || udp == NULL) {
413 SAFE_FREE(pconv);
414 SAFE_FREE(udp);
415 return NULL;
416 }
417
418 udp->PAM_username = user;
419 udp->PAM_password = passwd;
420 udp->PAM_newpassword = newpass;
421
422 pconv->conv = smb_pam_conv_fnptr;
423 pconv->appdata_ptr = (void *)udp;
424 return pconv;
425}
426
427/*
428 * PAM Closing out cleanup handler
429 */
430
431static BOOL smb_pam_end(pam_handle_t *pamh, struct pam_conv *smb_pam_conv_ptr)
432{
433 int pam_error;
434
435 smb_free_pam_conv(smb_pam_conv_ptr);
436
437 if( pamh != NULL ) {
438 pam_error = pam_end(pamh, 0);
439 if(smb_pam_error_handler(pamh, pam_error, "End Cleanup Failed", 2) == True) {
440 DEBUG(4, ("smb_pam_end: PAM: PAM_END OK.\n"));
441 return True;
442 }
443 }
444 DEBUG(2,("smb_pam_end: PAM: not initialised"));
445 return False;
446}
447
448/*
449 * Start PAM authentication for specified account
450 */
451
452static BOOL smb_pam_start(pam_handle_t **pamh, const char *user, const char *rhost, struct pam_conv *pconv)
453{
454 int pam_error;
455 const char *our_rhost;
456
457 *pamh = (pam_handle_t *)NULL;
458
459 DEBUG(4,("smb_pam_start: PAM: Init user: %s\n", user));
460
461 pam_error = pam_start("samba", user, pconv, pamh);
462 if( !smb_pam_error_handler(*pamh, pam_error, "Init Failed", 0)) {
463 *pamh = (pam_handle_t *)NULL;
464 return False;
465 }
466
467 if (rhost == NULL) {
468 our_rhost = client_name();
469 if (strequal(our_rhost,"UNKNOWN"))
470 our_rhost = client_addr();
471 } else {
472 our_rhost = rhost;
473 }
474
475#ifdef PAM_RHOST
476 DEBUG(4,("smb_pam_start: PAM: setting rhost to: %s\n", our_rhost));
477 pam_error = pam_set_item(*pamh, PAM_RHOST, our_rhost);
478 if(!smb_pam_error_handler(*pamh, pam_error, "set rhost failed", 0)) {
479 smb_pam_end(*pamh, pconv);
480 *pamh = (pam_handle_t *)NULL;
481 return False;
482 }
483#endif
484#ifdef PAM_TTY
485 DEBUG(4,("smb_pam_start: PAM: setting tty\n"));
486 pam_error = pam_set_item(*pamh, PAM_TTY, "samba");
487 if (!smb_pam_error_handler(*pamh, pam_error, "set tty failed", 0)) {
488 smb_pam_end(*pamh, pconv);
489 *pamh = (pam_handle_t *)NULL;
490 return False;
491 }
492#endif
493 DEBUG(4,("smb_pam_start: PAM: Init passed for user: %s\n", user));
494 return True;
495}
496
497/*
498 * PAM Authentication Handler
499 */
500static NTSTATUS smb_pam_auth(pam_handle_t *pamh, const char *user)
501{
502 int pam_error;
503 NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
504
505 /*
506 * To enable debugging set in /etc/pam.d/samba:
507 * auth required /lib/security/pam_pwdb.so nullok shadow audit
508 */
509
510 DEBUG(4,("smb_pam_auth: PAM: Authenticate User: %s\n", user));
511 pam_error = pam_authenticate(pamh, PAM_SILENT | lp_null_passwords() ? 0 : PAM_DISALLOW_NULL_AUTHTOK);
512 switch( pam_error ){
513 case PAM_AUTH_ERR:
514 DEBUG(2, ("smb_pam_auth: PAM: Authentication Error for user %s\n", user));
515 break;
516 case PAM_CRED_INSUFFICIENT:
517 DEBUG(2, ("smb_pam_auth: PAM: Insufficient Credentials for user %s\n", user));
518 break;
519 case PAM_AUTHINFO_UNAVAIL:
520 DEBUG(2, ("smb_pam_auth: PAM: Authentication Information Unavailable for user %s\n", user));
521 break;
522 case PAM_USER_UNKNOWN:
523 DEBUG(2, ("smb_pam_auth: PAM: Username %s NOT known to Authentication system\n", user));
524 break;
525 case PAM_MAXTRIES:
526 DEBUG(2, ("smb_pam_auth: PAM: One or more authentication modules reports user limit for user %s exceeeded\n", user));
527 break;
528 case PAM_ABORT:
529 DEBUG(0, ("smb_pam_auth: PAM: One or more PAM modules failed to load for user %s\n", user));
530 break;
531 case PAM_SUCCESS:
532 DEBUG(4, ("smb_pam_auth: PAM: User %s Authenticated OK\n", user));
533 break;
534 default:
535 DEBUG(0, ("smb_pam_auth: PAM: UNKNOWN ERROR while authenticating user %s\n", user));
536 break;
537 }
538
539 smb_pam_nt_status_error_handler(pamh, pam_error, "Authentication Failure", 2, &nt_status);
540 return nt_status;
541}
542
543/*
544 * PAM Account Handler
545 */
546static NTSTATUS smb_pam_account(pam_handle_t *pamh, const char * user)
547{
548 int pam_error;
549 NTSTATUS nt_status = NT_STATUS_ACCOUNT_DISABLED;
550
551 DEBUG(4,("smb_pam_account: PAM: Account Management for User: %s\n", user));
552 pam_error = pam_acct_mgmt(pamh, PAM_SILENT); /* Is user account enabled? */
553 switch( pam_error ) {
554 case PAM_AUTHTOK_EXPIRED:
555 DEBUG(2, ("smb_pam_account: PAM: User %s is valid but password is expired\n", user));
556 break;
557 case PAM_ACCT_EXPIRED:
558 DEBUG(2, ("smb_pam_account: PAM: User %s no longer permitted to access system\n", user));
559 break;
560 case PAM_AUTH_ERR:
561 DEBUG(2, ("smb_pam_account: PAM: There was an authentication error for user %s\n", user));
562 break;
563 case PAM_PERM_DENIED:
564 DEBUG(0, ("smb_pam_account: PAM: User %s is NOT permitted to access system at this time\n", user));
565 break;
566 case PAM_USER_UNKNOWN:
567 DEBUG(0, ("smb_pam_account: PAM: User \"%s\" is NOT known to account management\n", user));
568 break;
569 case PAM_SUCCESS:
570 DEBUG(4, ("smb_pam_account: PAM: Account OK for User: %s\n", user));
571 break;
572 default:
573 DEBUG(0, ("smb_pam_account: PAM: UNKNOWN PAM ERROR (%d) during Account Management for User: %s\n", pam_error, user));
574 break;
575 }
576
577 smb_pam_nt_status_error_handler(pamh, pam_error, "Account Check Failed", 2, &nt_status);
578 return nt_status;
579}
580
581/*
582 * PAM Credential Setting
583 */
584
585static NTSTATUS smb_pam_setcred(pam_handle_t *pamh, const char * user)
586{
587 int pam_error;
588 NTSTATUS nt_status = NT_STATUS_NO_TOKEN;
589
590 /*
591 * This will allow samba to aquire a kerberos token. And, when
592 * exporting an AFS cell, be able to /write/ to this cell.
593 */
594
595 DEBUG(4,("PAM: Account Management SetCredentials for User: %s\n", user));
596 pam_error = pam_setcred(pamh, (PAM_ESTABLISH_CRED|PAM_SILENT));
597 switch( pam_error ) {
598 case PAM_CRED_UNAVAIL:
599 DEBUG(0, ("smb_pam_setcred: PAM: Credentials not found for user:%s\n", user ));
600 break;
601 case PAM_CRED_EXPIRED:
602 DEBUG(0, ("smb_pam_setcred: PAM: Credentials for user: \"%s\" EXPIRED!\n", user ));
603 break;
604 case PAM_USER_UNKNOWN:
605 DEBUG(0, ("smb_pam_setcred: PAM: User: \"%s\" is NOT known so can not set credentials!\n", user ));
606 break;
607 case PAM_CRED_ERR:
608 DEBUG(0, ("smb_pam_setcred: PAM: Unknown setcredentials error - unable to set credentials for %s\n", user ));
609 break;
610 case PAM_SUCCESS:
611 DEBUG(4, ("smb_pam_setcred: PAM: SetCredentials OK for User: %s\n", user));
612 break;
613 default:
614 DEBUG(0, ("smb_pam_setcred: PAM: UNKNOWN PAM ERROR (%d) during SetCredentials for User: %s\n", pam_error, user));
615 break;
616 }
617
618 smb_pam_nt_status_error_handler(pamh, pam_error, "Set Credential Failure", 2, &nt_status);
619 return nt_status;
620}
621
622/*
623 * PAM Internal Session Handler
624 */
625static BOOL smb_internal_pam_session(pam_handle_t *pamh, const char *user, const char *tty, BOOL flag)
626{
627 int pam_error;
628
629#ifdef PAM_TTY
630 DEBUG(4,("smb_internal_pam_session: PAM: tty set to: %s\n", tty));
631 pam_error = pam_set_item(pamh, PAM_TTY, tty);
632 if (!smb_pam_error_handler(pamh, pam_error, "set tty failed", 0))
633 return False;
634#endif
635
636 if (flag) {
637 pam_error = pam_open_session(pamh, PAM_SILENT);
638 if (!smb_pam_error_handler(pamh, pam_error, "session setup failed", 0))
639 return False;
640 } else {
641 pam_setcred(pamh, (PAM_DELETE_CRED|PAM_SILENT)); /* We don't care if this fails */
642 pam_error = pam_close_session(pamh, PAM_SILENT); /* This will probably pick up the error anyway */
643 if (!smb_pam_error_handler(pamh, pam_error, "session close failed", 0))
644 return False;
645 }
646 return (True);
647}
648
649/*
650 * Internal PAM Password Changer.
651 */
652
653static BOOL smb_pam_chauthtok(pam_handle_t *pamh, const char * user)
654{
655 int pam_error;
656
657 DEBUG(4,("smb_pam_chauthtok: PAM: Password Change for User: %s\n", user));
658
659 pam_error = pam_chauthtok(pamh, PAM_SILENT); /* Change Password */
660
661 switch( pam_error ) {
662 case PAM_AUTHTOK_ERR:
663 DEBUG(2, ("PAM: unable to obtain the new authentication token - is password to weak?\n"));
664 break;
665
666 /* This doesn't seem to be defined on Solaris. JRA */
667#ifdef PAM_AUTHTOK_RECOVER_ERR
668 case PAM_AUTHTOK_RECOVER_ERR:
669 DEBUG(2, ("PAM: unable to obtain the old authentication token - was the old password wrong?.\n"));
670 break;
671#endif
672
673 case PAM_AUTHTOK_LOCK_BUSY:
674 DEBUG(2, ("PAM: unable to change the authentication token since it is currently locked.\n"));
675 break;
676 case PAM_AUTHTOK_DISABLE_AGING:
677 DEBUG(2, ("PAM: Authentication token aging has been disabled.\n"));
678 break;
679 case PAM_PERM_DENIED:
680 DEBUG(0, ("PAM: Permission denied.\n"));
681 break;
682 case PAM_TRY_AGAIN:
683 DEBUG(0, ("PAM: Could not update all authentication token(s). No authentication tokens were updated.\n"));
684 break;
685 case PAM_USER_UNKNOWN:
686 DEBUG(0, ("PAM: User not known to PAM\n"));
687 break;
688 case PAM_SUCCESS:
689 DEBUG(4, ("PAM: Account OK for User: %s\n", user));
690 break;
691 default:
692 DEBUG(0, ("PAM: UNKNOWN PAM ERROR (%d) for User: %s\n", pam_error, user));
693 }
694
695 if(!smb_pam_error_handler(pamh, pam_error, "Password Change Failed", 2)) {
696 return False;
697 }
698
699 /* If this point is reached, the password has changed. */
700 return True;
701}
702
703/*
704 * PAM Externally accessible Session handler
705 */
706
707BOOL smb_pam_claim_session(char *user, char *tty, char *rhost)
708{
709 pam_handle_t *pamh = NULL;
710 struct pam_conv *pconv = NULL;
711
712 /* Ignore PAM if told to. */
713
714 if (!lp_obey_pam_restrictions())
715 return True;
716
717 if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
718 return False;
719
720 if (!smb_pam_start(&pamh, user, rhost, pconv))
721 return False;
722
723 if (!smb_internal_pam_session(pamh, user, tty, True)) {
724 smb_pam_end(pamh, pconv);
725 return False;
726 }
727
728 return smb_pam_end(pamh, pconv);
729}
730
731/*
732 * PAM Externally accessible Session handler
733 */
734
735BOOL smb_pam_close_session(char *user, char *tty, char *rhost)
736{
737 pam_handle_t *pamh = NULL;
738 struct pam_conv *pconv = NULL;
739
740 /* Ignore PAM if told to. */
741
742 if (!lp_obey_pam_restrictions())
743 return True;
744
745 if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
746 return False;
747
748 if (!smb_pam_start(&pamh, user, rhost, pconv))
749 return False;
750
751 if (!smb_internal_pam_session(pamh, user, tty, False)) {
752 smb_pam_end(pamh, pconv);
753 return False;
754 }
755
756 return smb_pam_end(pamh, pconv);
757}
758
759/*
760 * PAM Externally accessible Account handler
761 */
762
763NTSTATUS smb_pam_accountcheck(const char * user)
764{
765 NTSTATUS nt_status = NT_STATUS_ACCOUNT_DISABLED;
766 pam_handle_t *pamh = NULL;
767 struct pam_conv *pconv = NULL;
768
769 /* Ignore PAM if told to. */
770
771 if (!lp_obey_pam_restrictions())
772 return NT_STATUS_OK;
773
774 if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
775 return NT_STATUS_NO_MEMORY;
776
777 if (!smb_pam_start(&pamh, user, NULL, pconv))
778 return NT_STATUS_ACCOUNT_DISABLED;
779
780 if (!NT_STATUS_IS_OK(nt_status = smb_pam_account(pamh, user)))
781 DEBUG(0, ("smb_pam_accountcheck: PAM: Account Validation Failed - Rejecting User %s!\n", user));
782
783 smb_pam_end(pamh, pconv);
784 return nt_status;
785}
786
787/*
788 * PAM Password Validation Suite
789 */
790
791NTSTATUS smb_pam_passcheck(const char * user, const char * password)
792{
793 pam_handle_t *pamh = NULL;
794 NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
795 struct pam_conv *pconv = NULL;
796
797 /*
798 * Note we can't ignore PAM here as this is the only
799 * way of doing auths on plaintext passwords when
800 * compiled --with-pam.
801 */
802
803 if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, password, NULL)) == NULL)
804 return NT_STATUS_LOGON_FAILURE;
805
806 if (!smb_pam_start(&pamh, user, NULL, pconv))
807 return NT_STATUS_LOGON_FAILURE;
808
809 if (!NT_STATUS_IS_OK(nt_status = smb_pam_auth(pamh, user))) {
810 DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_auth failed - Rejecting User %s !\n", user));
811 smb_pam_end(pamh, pconv);
812 return nt_status;
813 }
814
815 if (!NT_STATUS_IS_OK(nt_status = smb_pam_account(pamh, user))) {
816 DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_account failed - Rejecting User %s !\n", user));
817 smb_pam_end(pamh, pconv);
818 return nt_status;
819 }
820
821 if (!NT_STATUS_IS_OK(nt_status = smb_pam_setcred(pamh, user))) {
822 DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_setcred failed - Rejecting User %s !\n", user));
823 smb_pam_end(pamh, pconv);
824 return nt_status;
825 }
826
827 smb_pam_end(pamh, pconv);
828 return nt_status;
829}
830
831/*
832 * PAM Password Change Suite
833 */
834
835BOOL smb_pam_passchange(const char * user, const char * oldpassword, const char * newpassword)
836{
837 /* Appropriate quantities of root should be obtained BEFORE calling this function */
838 struct pam_conv *pconv = NULL;
839 pam_handle_t *pamh = NULL;
840
841 if ((pconv = smb_setup_pam_conv(smb_pam_passchange_conv, user, oldpassword, newpassword)) == NULL)
842 return False;
843
844 if(!smb_pam_start(&pamh, user, NULL, pconv))
845 return False;
846
847 if (!smb_pam_chauthtok(pamh, user)) {
848 DEBUG(0, ("smb_pam_passchange: PAM: Password Change Failed for user %s!\n", user));
849 smb_pam_end(pamh, pconv);
850 return False;
851 }
852
853 return smb_pam_end(pamh, pconv);
854}
855
856#else
857
858/* If PAM not used, no PAM restrictions on accounts. */
859NTSTATUS smb_pam_accountcheck(const char * user)
860{
861 return NT_STATUS_OK;
862}
863
864/* If PAM not used, also no PAM restrictions on sessions. */
865BOOL smb_pam_claim_session(char *user, char *tty, char *rhost)
866{
867 return True;
868}
869
870/* If PAM not used, also no PAM restrictions on sessions. */
871BOOL smb_pam_close_session(char *in_user, char *tty, char *rhost)
872{
873 return True;
874}
875#endif /* WITH_PAM */
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