source: branches/samba-3.2.x/source/auth/pampass.c@ 204

Last change on this file since 204 was 133, checked in by Paul Smedley, 17 years ago

Update trunk to 3.2.0pre3
File size: 24.1 KB
Line 
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 3 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, see <http://www.gnu.org/licenses/>.
21*/
22
23/*
24 * This module provides PAM based functions for validation of
25 * username/password pairs, account managment, session and access control.
26 * Note: SMB password checking is done in smbpass.c
27 */
28
29#include "includes.h"
30
31#undef DBGC_CLASS
32#define DBGC_CLASS DBGC_AUTH
33
34#ifdef WITH_PAM
35
36/*******************************************************************
37 * Handle PAM authentication
38 * - Access, Authentication, Session, Password
39 * Note: See PAM Documentation and refer to local system PAM implementation
40 * which determines what actions/limitations/allowances become affected.
41 *********************************************************************/
42
43#if defined(HAVE_SECURITY_PAM_APPL_H)
44#include <security/pam_appl.h>
45#elif defined(HAVE_PAM_PAM_APPL_H)
46#include <pam/pam_appl.h>
47#endif
48
49/*
50 * Structure used to communicate between the conversation function
51 * and the server_login/change password functions.
52 */
53
54struct smb_pam_userdata {
55 const char *PAM_username;
56 const char *PAM_password;
57 const char *PAM_newpassword;
58};
59
60typedef int (*smb_pam_conv_fn)(int, const struct pam_message **, struct pam_response **, void *appdata_ptr);
61
62/*
63 * Macros to help make life easy
64 */
65#define COPY_STRING(s) (s) ? SMB_STRDUP(s) : NULL
66
67/*******************************************************************
68 PAM error handler.
69 *********************************************************************/
70
71static bool smb_pam_error_handler(pam_handle_t *pamh, int pam_error, const char *msg, int dbglvl)
72{
73
74 if( pam_error != PAM_SUCCESS) {
75 DEBUG(dbglvl, ("smb_pam_error_handler: PAM: %s : %s\n",
76 msg, pam_strerror(pamh, pam_error)));
77
78 return False;
79 }
80 return True;
81}
82
83/*******************************************************************
84 This function is a sanity check, to make sure that we NEVER report
85 failure as sucess.
86*********************************************************************/
87
88static bool smb_pam_nt_status_error_handler(pam_handle_t *pamh, int pam_error,
89 const char *msg, int dbglvl,
90 NTSTATUS *nt_status)
91{
92 *nt_status = pam_to_nt_status(pam_error);
93
94 if (smb_pam_error_handler(pamh, pam_error, msg, dbglvl))
95 return True;
96
97 if (NT_STATUS_IS_OK(*nt_status)) {
98 /* Complain LOUDLY */
99 DEBUG(0, ("smb_pam_nt_status_error_handler: PAM: BUG: PAM and NT_STATUS \
100error MISMATCH, forcing to NT_STATUS_LOGON_FAILURE"));
101 *nt_status = NT_STATUS_LOGON_FAILURE;
102 }
103 return False;
104}
105
106/*
107 * PAM conversation function
108 * Here we assume (for now, at least) that echo on means login name, and
109 * echo off means password.
110 */
111
112static int smb_pam_conv(int num_msg,
113 const struct pam_message **msg,
114 struct pam_response **resp,
115 void *appdata_ptr)
116{
117 int replies = 0;
118 struct pam_response *reply = NULL;
119 struct smb_pam_userdata *udp = (struct smb_pam_userdata *)appdata_ptr;
120
121 *resp = NULL;
122
123 if (num_msg <= 0)
124 return PAM_CONV_ERR;
125
126 /*
127 * Apparantly HPUX has a buggy PAM that doesn't support the
128 * appdata_ptr. Fail if this is the case. JRA.
129 */
130
131 if (udp == NULL) {
132 DEBUG(0,("smb_pam_conv: PAM on this system is broken - appdata_ptr == NULL !\n"));
133 return PAM_CONV_ERR;
134 }
135
136 reply = SMB_MALLOC_ARRAY(struct pam_response, num_msg);
137 if (!reply)
138 return PAM_CONV_ERR;
139
140 memset(reply, '\0', sizeof(struct pam_response) * num_msg);
141
142 for (replies = 0; replies < num_msg; replies++) {
143 switch (msg[replies]->msg_style) {
144 case PAM_PROMPT_ECHO_ON:
145 reply[replies].resp_retcode = PAM_SUCCESS;
146 reply[replies].resp = COPY_STRING(udp->PAM_username);
147 /* PAM frees resp */
148 break;
149
150 case PAM_PROMPT_ECHO_OFF:
151 reply[replies].resp_retcode = PAM_SUCCESS;
152 reply[replies].resp = COPY_STRING(udp->PAM_password);
153 /* PAM frees resp */
154 break;
155
156 case PAM_TEXT_INFO:
157 /* fall through */
158
159 case PAM_ERROR_MSG:
160 /* ignore it... */
161 reply[replies].resp_retcode = PAM_SUCCESS;
162 reply[replies].resp = NULL;
163 break;
164
165 default:
166 /* Must be an error of some sort... */
167 SAFE_FREE(reply);
168 return PAM_CONV_ERR;
169 }
170 }
171 if (reply)
172 *resp = reply;
173 return PAM_SUCCESS;
174}
175
176/*
177 * PAM password change conversation function
178 * Here we assume (for now, at least) that echo on means login name, and
179 * echo off means password.
180 */
181
182static void special_char_sub(char *buf)
183{
184 all_string_sub(buf, "\\n", "", 0);
185 all_string_sub(buf, "\\r", "", 0);
186 all_string_sub(buf, "\\s", " ", 0);
187 all_string_sub(buf, "\\t", "\t", 0);
188}
189
190static void pwd_sub(char *buf, const char *username, const char *oldpass, const char *newpass)
191{
192 fstring_sub(buf, "%u", username);
193 all_string_sub(buf, "%o", oldpass, sizeof(fstring));
194 all_string_sub(buf, "%n", newpass, sizeof(fstring));
195}
196
197
198struct chat_struct {
199 struct chat_struct *next, *prev;
200 fstring prompt;
201 fstring reply;
202};
203
204/**************************************************************
205 Create a linked list containing chat data.
206***************************************************************/
207
208static struct chat_struct *make_pw_chat(const char *p)
209{
210 char *prompt;
211 char *reply;
212 struct chat_struct *list = NULL;
213 struct chat_struct *t;
214 TALLOC_CTX *frame = talloc_stackframe();
215
216 while (1) {
217 t = SMB_MALLOC_P(struct chat_struct);
218 if (!t) {
219 DEBUG(0,("make_pw_chat: malloc failed!\n"));
220 TALLOC_FREE(frame);
221 return NULL;
222 }
223
224 ZERO_STRUCTP(t);
225
226 DLIST_ADD_END(list, t, struct chat_struct*);
227
228 if (!next_token_talloc(frame, &p, &prompt, NULL)) {
229 break;
230 }
231
232 if (strequal(prompt,".")) {
233 fstrcpy(prompt,"*");
234 }
235
236 special_char_sub(prompt);
237 fstrcpy(t->prompt, prompt);
238 strlower_m(t->prompt);
239 trim_char(t->prompt, ' ', ' ');
240
241 if (!next_token_talloc(frame, &p, &reply, NULL)) {
242 break;
243 }
244
245 if (strequal(reply,".")) {
246 fstrcpy(reply,"");
247 }
248
249 special_char_sub(reply);
250 fstrcpy(t->reply, reply);
251 strlower_m(t->reply);
252 trim_char(t->reply, ' ', ' ');
253
254 }
255 TALLOC_FREE(frame);
256 return list;
257}
258
259static void free_pw_chat(struct chat_struct *list)
260{
261 while (list) {
262 struct chat_struct *old_head = list;
263 DLIST_REMOVE(list, list);
264 SAFE_FREE(old_head);
265 }
266}
267
268static int smb_pam_passchange_conv(int num_msg,
269 const struct pam_message **msg,
270 struct pam_response **resp,
271 void *appdata_ptr)
272{
273 int replies = 0;
274 struct pam_response *reply = NULL;
275 fstring current_prompt;
276 fstring current_reply;
277 struct smb_pam_userdata *udp = (struct smb_pam_userdata *)appdata_ptr;
278 struct chat_struct *pw_chat= make_pw_chat(lp_passwd_chat());
279 struct chat_struct *t;
280 bool found;
281 *resp = NULL;
282
283 DEBUG(10,("smb_pam_passchange_conv: starting converstation for %d messages\n", num_msg));
284
285 if (num_msg <= 0)
286 return PAM_CONV_ERR;
287
288 if (pw_chat == NULL)
289 return PAM_CONV_ERR;
290
291 /*
292 * Apparantly HPUX has a buggy PAM that doesn't support the
293 * appdata_ptr. Fail if this is the case. JRA.
294 */
295
296 if (udp == NULL) {
297 DEBUG(0,("smb_pam_passchange_conv: PAM on this system is broken - appdata_ptr == NULL !\n"));
298 free_pw_chat(pw_chat);
299 return PAM_CONV_ERR;
300 }
301
302 reply = SMB_MALLOC_ARRAY(struct pam_response, num_msg);
303 if (!reply) {
304 DEBUG(0,("smb_pam_passchange_conv: malloc for reply failed!\n"));
305 free_pw_chat(pw_chat);
306 return PAM_CONV_ERR;
307 }
308
309 for (replies = 0; replies < num_msg; replies++) {
310 found = False;
311 DEBUG(10,("smb_pam_passchange_conv: Processing message %d\n", replies));
312 switch (msg[replies]->msg_style) {
313 case PAM_PROMPT_ECHO_ON:
314 DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: PAM said: %s\n", msg[replies]->msg));
315 fstrcpy(current_prompt, msg[replies]->msg);
316 trim_char(current_prompt, ' ', ' ');
317 for (t=pw_chat; t; t=t->next) {
318
319 DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: trying to match |%s| to |%s|\n",
320 t->prompt, current_prompt ));
321
322 if (unix_wild_match(t->prompt, current_prompt)) {
323 fstrcpy(current_reply, t->reply);
324 DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: We sent: %s\n", current_reply));
325 pwd_sub(current_reply, udp->PAM_username, udp->PAM_password, udp->PAM_newpassword);
326#ifdef DEBUG_PASSWORD
327 DEBUG(100,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: We actualy sent: %s\n", current_reply));
328#endif
329 reply[replies].resp_retcode = PAM_SUCCESS;
330 reply[replies].resp = COPY_STRING(current_reply);
331 found = True;
332 break;
333 }
334 }
335 /* PAM frees resp */
336 if (!found) {
337 DEBUG(3,("smb_pam_passchange_conv: Could not find reply for PAM prompt: %s\n",msg[replies]->msg));
338 free_pw_chat(pw_chat);
339 SAFE_FREE(reply);
340 return PAM_CONV_ERR;
341 }
342 break;
343
344 case PAM_PROMPT_ECHO_OFF:
345 DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: PAM said: %s\n", msg[replies]->msg));
346 fstrcpy(current_prompt, msg[replies]->msg);
347 trim_char(current_prompt, ' ', ' ');
348 for (t=pw_chat; t; t=t->next) {
349
350 DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: trying to match |%s| to |%s|\n",
351 t->prompt, current_prompt ));
352
353 if (unix_wild_match(t->prompt, current_prompt)) {
354 fstrcpy(current_reply, t->reply);
355 DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: We sent: %s\n", current_reply));
356 pwd_sub(current_reply, udp->PAM_username, udp->PAM_password, udp->PAM_newpassword);
357 reply[replies].resp_retcode = PAM_SUCCESS;
358 reply[replies].resp = COPY_STRING(current_reply);
359#ifdef DEBUG_PASSWORD
360 DEBUG(100,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: We actualy sent: %s\n", current_reply));
361#endif
362 found = True;
363 break;
364 }
365 }
366 /* PAM frees resp */
367
368 if (!found) {
369 DEBUG(3,("smb_pam_passchange_conv: Could not find reply for PAM prompt: %s\n",msg[replies]->msg));
370 free_pw_chat(pw_chat);
371 SAFE_FREE(reply);
372 return PAM_CONV_ERR;
373 }
374 break;
375
376 case PAM_TEXT_INFO:
377 /* fall through */
378
379 case PAM_ERROR_MSG:
380 /* ignore it... */
381 reply[replies].resp_retcode = PAM_SUCCESS;
382 reply[replies].resp = NULL;
383 break;
384
385 default:
386 /* Must be an error of some sort... */
387 free_pw_chat(pw_chat);
388 SAFE_FREE(reply);
389 return PAM_CONV_ERR;
390 }
391 }
392
393 free_pw_chat(pw_chat);
394 if (reply)
395 *resp = reply;
396 return PAM_SUCCESS;
397}
398
399/***************************************************************************
400 Free up a malloced pam_conv struct.
401****************************************************************************/
402
403static void smb_free_pam_conv(struct pam_conv *pconv)
404{
405 if (pconv)
406 SAFE_FREE(pconv->appdata_ptr);
407
408 SAFE_FREE(pconv);
409}
410
411/***************************************************************************
412 Allocate a pam_conv struct.
413****************************************************************************/
414
415static struct pam_conv *smb_setup_pam_conv(smb_pam_conv_fn smb_pam_conv_fnptr, const char *user,
416 const char *passwd, const char *newpass)
417{
418 struct pam_conv *pconv = SMB_MALLOC_P(struct pam_conv);
419 struct smb_pam_userdata *udp = SMB_MALLOC_P(struct smb_pam_userdata);
420
421 if (pconv == NULL || udp == NULL) {
422 SAFE_FREE(pconv);
423 SAFE_FREE(udp);
424 return NULL;
425 }
426
427 udp->PAM_username = user;
428 udp->PAM_password = passwd;
429 udp->PAM_newpassword = newpass;
430
431 pconv->conv = smb_pam_conv_fnptr;
432 pconv->appdata_ptr = (void *)udp;
433 return pconv;
434}
435
436/*
437 * PAM Closing out cleanup handler
438 */
439
440static bool smb_pam_end(pam_handle_t *pamh, struct pam_conv *smb_pam_conv_ptr)
441{
442 int pam_error;
443
444 smb_free_pam_conv(smb_pam_conv_ptr);
445
446 if( pamh != NULL ) {
447 pam_error = pam_end(pamh, 0);
448 if(smb_pam_error_handler(pamh, pam_error, "End Cleanup Failed", 2) == True) {
449 DEBUG(4, ("smb_pam_end: PAM: PAM_END OK.\n"));
450 return True;
451 }
452 }
453 DEBUG(2,("smb_pam_end: PAM: not initialised"));
454 return False;
455}
456
457/*
458 * Start PAM authentication for specified account
459 */
460
461static bool smb_pam_start(pam_handle_t **pamh, const char *user, const char *rhost, struct pam_conv *pconv)
462{
463 int pam_error;
464 const char *our_rhost;
465 char addr[INET6_ADDRSTRLEN];
466
467 *pamh = (pam_handle_t *)NULL;
468
469 DEBUG(4,("smb_pam_start: PAM: Init user: %s\n", user));
470
471 pam_error = pam_start("samba", user, pconv, pamh);
472 if( !smb_pam_error_handler(*pamh, pam_error, "Init Failed", 0)) {
473 *pamh = (pam_handle_t *)NULL;
474 return False;
475 }
476
477 if (rhost == NULL) {
478 our_rhost = client_name(get_client_fd());
479 if (strequal(our_rhost,"UNKNOWN"))
480 our_rhost = client_addr(get_client_fd(),addr,sizeof(addr));
481 } else {
482 our_rhost = rhost;
483 }
484
485#ifdef PAM_RHOST
486 DEBUG(4,("smb_pam_start: PAM: setting rhost to: %s\n", our_rhost));
487 pam_error = pam_set_item(*pamh, PAM_RHOST, our_rhost);
488 if(!smb_pam_error_handler(*pamh, pam_error, "set rhost failed", 0)) {
489 smb_pam_end(*pamh, pconv);
490 *pamh = (pam_handle_t *)NULL;
491 return False;
492 }
493#endif
494#ifdef PAM_TTY
495 DEBUG(4,("smb_pam_start: PAM: setting tty\n"));
496 pam_error = pam_set_item(*pamh, PAM_TTY, "samba");
497 if (!smb_pam_error_handler(*pamh, pam_error, "set tty failed", 0)) {
498 smb_pam_end(*pamh, pconv);
499 *pamh = (pam_handle_t *)NULL;
500 return False;
501 }
502#endif
503 DEBUG(4,("smb_pam_start: PAM: Init passed for user: %s\n", user));
504 return True;
505}
506
507/*
508 * PAM Authentication Handler
509 */
510static NTSTATUS smb_pam_auth(pam_handle_t *pamh, const char *user)
511{
512 int pam_error;
513 NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
514
515 /*
516 * To enable debugging set in /etc/pam.d/samba:
517 * auth required /lib/security/pam_pwdb.so nullok shadow audit
518 */
519
520 DEBUG(4,("smb_pam_auth: PAM: Authenticate User: %s\n", user));
521 pam_error = pam_authenticate(pamh, PAM_SILENT | lp_null_passwords() ? 0 : PAM_DISALLOW_NULL_AUTHTOK);
522 switch( pam_error ){
523 case PAM_AUTH_ERR:
524 DEBUG(2, ("smb_pam_auth: PAM: Authentication Error for user %s\n", user));
525 break;
526 case PAM_CRED_INSUFFICIENT:
527 DEBUG(2, ("smb_pam_auth: PAM: Insufficient Credentials for user %s\n", user));
528 break;
529 case PAM_AUTHINFO_UNAVAIL:
530 DEBUG(2, ("smb_pam_auth: PAM: Authentication Information Unavailable for user %s\n", user));
531 break;
532 case PAM_USER_UNKNOWN:
533 DEBUG(2, ("smb_pam_auth: PAM: Username %s NOT known to Authentication system\n", user));
534 break;
535 case PAM_MAXTRIES:
536 DEBUG(2, ("smb_pam_auth: PAM: One or more authentication modules reports user limit for user %s exceeeded\n", user));
537 break;
538 case PAM_ABORT:
539 DEBUG(0, ("smb_pam_auth: PAM: One or more PAM modules failed to load for user %s\n", user));
540 break;
541 case PAM_SUCCESS:
542 DEBUG(4, ("smb_pam_auth: PAM: User %s Authenticated OK\n", user));
543 break;
544 default:
545 DEBUG(0, ("smb_pam_auth: PAM: UNKNOWN ERROR while authenticating user %s\n", user));
546 break;
547 }
548
549 smb_pam_nt_status_error_handler(pamh, pam_error, "Authentication Failure", 2, &nt_status);
550 return nt_status;
551}
552
553/*
554 * PAM Account Handler
555 */
556static NTSTATUS smb_pam_account(pam_handle_t *pamh, const char * user)
557{
558 int pam_error;
559 NTSTATUS nt_status = NT_STATUS_ACCOUNT_DISABLED;
560
561 DEBUG(4,("smb_pam_account: PAM: Account Management for User: %s\n", user));
562 pam_error = pam_acct_mgmt(pamh, PAM_SILENT); /* Is user account enabled? */
563 switch( pam_error ) {
564 case PAM_AUTHTOK_EXPIRED:
565 DEBUG(2, ("smb_pam_account: PAM: User %s is valid but password is expired\n", user));
566 break;
567 case PAM_ACCT_EXPIRED:
568 DEBUG(2, ("smb_pam_account: PAM: User %s no longer permitted to access system\n", user));
569 break;
570 case PAM_AUTH_ERR:
571 DEBUG(2, ("smb_pam_account: PAM: There was an authentication error for user %s\n", user));
572 break;
573 case PAM_PERM_DENIED:
574 DEBUG(0, ("smb_pam_account: PAM: User %s is NOT permitted to access system at this time\n", user));
575 break;
576 case PAM_USER_UNKNOWN:
577 DEBUG(0, ("smb_pam_account: PAM: User \"%s\" is NOT known to account management\n", user));
578 break;
579 case PAM_SUCCESS:
580 DEBUG(4, ("smb_pam_account: PAM: Account OK for User: %s\n", user));
581 break;
582 default:
583 DEBUG(0, ("smb_pam_account: PAM: UNKNOWN PAM ERROR (%d) during Account Management for User: %s\n", pam_error, user));
584 break;
585 }
586
587 smb_pam_nt_status_error_handler(pamh, pam_error, "Account Check Failed", 2, &nt_status);
588 return nt_status;
589}
590
591/*
592 * PAM Credential Setting
593 */
594
595static NTSTATUS smb_pam_setcred(pam_handle_t *pamh, const char * user)
596{
597 int pam_error;
598 NTSTATUS nt_status = NT_STATUS_NO_TOKEN;
599
600 /*
601 * This will allow samba to aquire a kerberos token. And, when
602 * exporting an AFS cell, be able to /write/ to this cell.
603 */
604
605 DEBUG(4,("PAM: Account Management SetCredentials for User: %s\n", user));
606 pam_error = pam_setcred(pamh, (PAM_ESTABLISH_CRED|PAM_SILENT));
607 switch( pam_error ) {
608 case PAM_CRED_UNAVAIL:
609 DEBUG(0, ("smb_pam_setcred: PAM: Credentials not found for user:%s\n", user ));
610 break;
611 case PAM_CRED_EXPIRED:
612 DEBUG(0, ("smb_pam_setcred: PAM: Credentials for user: \"%s\" EXPIRED!\n", user ));
613 break;
614 case PAM_USER_UNKNOWN:
615 DEBUG(0, ("smb_pam_setcred: PAM: User: \"%s\" is NOT known so can not set credentials!\n", user ));
616 break;
617 case PAM_CRED_ERR:
618 DEBUG(0, ("smb_pam_setcred: PAM: Unknown setcredentials error - unable to set credentials for %s\n", user ));
619 break;
620 case PAM_SUCCESS:
621 DEBUG(4, ("smb_pam_setcred: PAM: SetCredentials OK for User: %s\n", user));
622 break;
623 default:
624 DEBUG(0, ("smb_pam_setcred: PAM: UNKNOWN PAM ERROR (%d) during SetCredentials for User: %s\n", pam_error, user));
625 break;
626 }
627
628 smb_pam_nt_status_error_handler(pamh, pam_error, "Set Credential Failure", 2, &nt_status);
629 return nt_status;
630}
631
632/*
633 * PAM Internal Session Handler
634 */
635static bool smb_internal_pam_session(pam_handle_t *pamh, const char *user, const char *tty, bool flag)
636{
637 int pam_error;
638
639#ifdef PAM_TTY
640 DEBUG(4,("smb_internal_pam_session: PAM: tty set to: %s\n", tty));
641 pam_error = pam_set_item(pamh, PAM_TTY, tty);
642 if (!smb_pam_error_handler(pamh, pam_error, "set tty failed", 0))
643 return False;
644#endif
645
646 if (flag) {
647 pam_error = pam_open_session(pamh, PAM_SILENT);
648 if (!smb_pam_error_handler(pamh, pam_error, "session setup failed", 0))
649 return False;
650 } else {
651 pam_setcred(pamh, (PAM_DELETE_CRED|PAM_SILENT)); /* We don't care if this fails */
652 pam_error = pam_close_session(pamh, PAM_SILENT); /* This will probably pick up the error anyway */
653 if (!smb_pam_error_handler(pamh, pam_error, "session close failed", 0))
654 return False;
655 }
656 return (True);
657}
658
659/*
660 * Internal PAM Password Changer.
661 */
662
663static bool smb_pam_chauthtok(pam_handle_t *pamh, const char * user)
664{
665 int pam_error;
666
667 DEBUG(4,("smb_pam_chauthtok: PAM: Password Change for User: %s\n", user));
668
669 pam_error = pam_chauthtok(pamh, PAM_SILENT); /* Change Password */
670
671 switch( pam_error ) {
672 case PAM_AUTHTOK_ERR:
673 DEBUG(2, ("PAM: unable to obtain the new authentication token - is password to weak?\n"));
674 break;
675
676 /* This doesn't seem to be defined on Solaris. JRA */
677#ifdef PAM_AUTHTOK_RECOVER_ERR
678 case PAM_AUTHTOK_RECOVER_ERR:
679 DEBUG(2, ("PAM: unable to obtain the old authentication token - was the old password wrong?.\n"));
680 break;
681#endif
682
683 case PAM_AUTHTOK_LOCK_BUSY:
684 DEBUG(2, ("PAM: unable to change the authentication token since it is currently locked.\n"));
685 break;
686 case PAM_AUTHTOK_DISABLE_AGING:
687 DEBUG(2, ("PAM: Authentication token aging has been disabled.\n"));
688 break;
689 case PAM_PERM_DENIED:
690 DEBUG(0, ("PAM: Permission denied.\n"));
691 break;
692 case PAM_TRY_AGAIN:
693 DEBUG(0, ("PAM: Could not update all authentication token(s). No authentication tokens were updated.\n"));
694 break;
695 case PAM_USER_UNKNOWN:
696 DEBUG(0, ("PAM: User not known to PAM\n"));
697 break;
698 case PAM_SUCCESS:
699 DEBUG(4, ("PAM: Account OK for User: %s\n", user));
700 break;
701 default:
702 DEBUG(0, ("PAM: UNKNOWN PAM ERROR (%d) for User: %s\n", pam_error, user));
703 }
704
705 if(!smb_pam_error_handler(pamh, pam_error, "Password Change Failed", 2)) {
706 return False;
707 }
708
709 /* If this point is reached, the password has changed. */
710 return True;
711}
712
713/*
714 * PAM Externally accessible Session handler
715 */
716
717bool smb_pam_claim_session(char *user, char *tty, char *rhost)
718{
719 pam_handle_t *pamh = NULL;
720 struct pam_conv *pconv = NULL;
721
722 /* Ignore PAM if told to. */
723
724 if (!lp_obey_pam_restrictions())
725 return True;
726
727 if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
728 return False;
729
730 if (!smb_pam_start(&pamh, user, rhost, pconv))
731 return False;
732
733 if (!smb_internal_pam_session(pamh, user, tty, True)) {
734 smb_pam_end(pamh, pconv);
735 return False;
736 }
737
738 return smb_pam_end(pamh, pconv);
739}
740
741/*
742 * PAM Externally accessible Session handler
743 */
744
745bool smb_pam_close_session(char *user, char *tty, char *rhost)
746{
747 pam_handle_t *pamh = NULL;
748 struct pam_conv *pconv = NULL;
749
750 /* Ignore PAM if told to. */
751
752 if (!lp_obey_pam_restrictions())
753 return True;
754
755 if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
756 return False;
757
758 if (!smb_pam_start(&pamh, user, rhost, pconv))
759 return False;
760
761 if (!smb_internal_pam_session(pamh, user, tty, False)) {
762 smb_pam_end(pamh, pconv);
763 return False;
764 }
765
766 return smb_pam_end(pamh, pconv);
767}
768
769/*
770 * PAM Externally accessible Account handler
771 */
772
773NTSTATUS smb_pam_accountcheck(const char * user)
774{
775 NTSTATUS nt_status = NT_STATUS_ACCOUNT_DISABLED;
776 pam_handle_t *pamh = NULL;
777 struct pam_conv *pconv = NULL;
778
779 /* Ignore PAM if told to. */
780
781 if (!lp_obey_pam_restrictions())
782 return NT_STATUS_OK;
783
784 if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
785 return NT_STATUS_NO_MEMORY;
786
787 if (!smb_pam_start(&pamh, user, NULL, pconv))
788 return NT_STATUS_ACCOUNT_DISABLED;
789
790 if (!NT_STATUS_IS_OK(nt_status = smb_pam_account(pamh, user)))
791 DEBUG(0, ("smb_pam_accountcheck: PAM: Account Validation Failed - Rejecting User %s!\n", user));
792
793 smb_pam_end(pamh, pconv);
794 return nt_status;
795}
796
797/*
798 * PAM Password Validation Suite
799 */
800
801NTSTATUS smb_pam_passcheck(const char * user, const char * password)
802{
803 pam_handle_t *pamh = NULL;
804 NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
805 struct pam_conv *pconv = NULL;
806
807 /*
808 * Note we can't ignore PAM here as this is the only
809 * way of doing auths on plaintext passwords when
810 * compiled --with-pam.
811 */
812
813 if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, password, NULL)) == NULL)
814 return NT_STATUS_LOGON_FAILURE;
815
816 if (!smb_pam_start(&pamh, user, NULL, pconv))
817 return NT_STATUS_LOGON_FAILURE;
818
819 if (!NT_STATUS_IS_OK(nt_status = smb_pam_auth(pamh, user))) {
820 DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_auth failed - Rejecting User %s !\n", user));
821 smb_pam_end(pamh, pconv);
822 return nt_status;
823 }
824
825 if (!NT_STATUS_IS_OK(nt_status = smb_pam_account(pamh, user))) {
826 DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_account failed - Rejecting User %s !\n", user));
827 smb_pam_end(pamh, pconv);
828 return nt_status;
829 }
830
831 if (!NT_STATUS_IS_OK(nt_status = smb_pam_setcred(pamh, user))) {
832 DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_setcred failed - Rejecting User %s !\n", user));
833 smb_pam_end(pamh, pconv);
834 return nt_status;
835 }
836
837 smb_pam_end(pamh, pconv);
838 return nt_status;
839}
840
841/*
842 * PAM Password Change Suite
843 */
844
845bool smb_pam_passchange(const char * user, const char * oldpassword, const char * newpassword)
846{
847 /* Appropriate quantities of root should be obtained BEFORE calling this function */
848 struct pam_conv *pconv = NULL;
849 pam_handle_t *pamh = NULL;
850
851 if ((pconv = smb_setup_pam_conv(smb_pam_passchange_conv, user, oldpassword, newpassword)) == NULL)
852 return False;
853
854 if(!smb_pam_start(&pamh, user, NULL, pconv))
855 return False;
856
857 if (!smb_pam_chauthtok(pamh, user)) {
858 DEBUG(0, ("smb_pam_passchange: PAM: Password Change Failed for user %s!\n", user));
859 smb_pam_end(pamh, pconv);
860 return False;
861 }
862
863 return smb_pam_end(pamh, pconv);
864}
865
866#else
867
868/* If PAM not used, no PAM restrictions on accounts. */
869NTSTATUS smb_pam_accountcheck(const char * user)
870{
871 return NT_STATUS_OK;
872}
873
874/* If PAM not used, also no PAM restrictions on sessions. */
875bool smb_pam_claim_session(char *user, char *tty, char *rhost)
876{
877 return True;
878}
879
880/* If PAM not used, also no PAM restrictions on sessions. */
881bool smb_pam_close_session(char *in_user, char *tty, char *rhost)
882{
883 return True;
884}
885#endif /* WITH_PAM */
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