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

Last change on this file was 228, checked in by Herwig Bauernfeind, 16 years ago

Update 3.2 branch to 3.2.6
File size: 25.0 KB
RevLine 
[228]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#define COPY_FSTRING(s) (s[0]) ? SMB_STRDUP(s) : NULL
67
68/*******************************************************************
69 PAM error handler.
70 *********************************************************************/
71
72static bool smb_pam_error_handler(pam_handle_t *pamh, int pam_error, const char *msg, int dbglvl)
73{
74
75 if( pam_error != PAM_SUCCESS) {
76 DEBUG(dbglvl, ("smb_pam_error_handler: PAM: %s : %s\n",
77 msg, pam_strerror(pamh, pam_error)));
78
79 return False;
80 }
81 return True;
82}
83
84/*******************************************************************
85 This function is a sanity check, to make sure that we NEVER report
86 failure as sucess.
87*********************************************************************/
88
89static bool smb_pam_nt_status_error_handler(pam_handle_t *pamh, int pam_error,
90 const char *msg, int dbglvl,
91 NTSTATUS *nt_status)
92{
93 *nt_status = pam_to_nt_status(pam_error);
94
95 if (smb_pam_error_handler(pamh, pam_error, msg, dbglvl))
96 return True;
97
98 if (NT_STATUS_IS_OK(*nt_status)) {
99 /* Complain LOUDLY */
100 DEBUG(0, ("smb_pam_nt_status_error_handler: PAM: BUG: PAM and NT_STATUS \
101error MISMATCH, forcing to NT_STATUS_LOGON_FAILURE"));
102 *nt_status = NT_STATUS_LOGON_FAILURE;
103 }
104 return False;
105}
106
107/*
108 * PAM conversation function
109 * Here we assume (for now, at least) that echo on means login name, and
110 * echo off means password.
111 */
112
113static int smb_pam_conv(int num_msg,
114 const struct pam_message **msg,
115 struct pam_response **resp,
116 void *appdata_ptr)
117{
118 int replies = 0;
119 struct pam_response *reply = NULL;
120 struct smb_pam_userdata *udp = (struct smb_pam_userdata *)appdata_ptr;
121
122 *resp = NULL;
123
124 if (num_msg <= 0)
125 return PAM_CONV_ERR;
126
127 /*
128 * Apparantly HPUX has a buggy PAM that doesn't support the
129 * appdata_ptr. Fail if this is the case. JRA.
130 */
131
132 if (udp == NULL) {
133 DEBUG(0,("smb_pam_conv: PAM on this system is broken - appdata_ptr == NULL !\n"));
134 return PAM_CONV_ERR;
135 }
136
137 reply = SMB_MALLOC_ARRAY(struct pam_response, num_msg);
138 if (!reply)
139 return PAM_CONV_ERR;
140
141 memset(reply, '\0', sizeof(struct pam_response) * num_msg);
142
143 for (replies = 0; replies < num_msg; replies++) {
144 switch (msg[replies]->msg_style) {
145 case PAM_PROMPT_ECHO_ON:
146 reply[replies].resp_retcode = PAM_SUCCESS;
147 reply[replies].resp = COPY_STRING(udp->PAM_username);
148 /* PAM frees resp */
149 break;
150
151 case PAM_PROMPT_ECHO_OFF:
152 reply[replies].resp_retcode = PAM_SUCCESS;
153 reply[replies].resp = COPY_STRING(udp->PAM_password);
154 /* PAM frees resp */
155 break;
156
157 case PAM_TEXT_INFO:
158 /* fall through */
159
160 case PAM_ERROR_MSG:
161 /* ignore it... */
162 reply[replies].resp_retcode = PAM_SUCCESS;
163 reply[replies].resp = NULL;
164 break;
165
166 default:
167 /* Must be an error of some sort... */
168 SAFE_FREE(reply);
169 return PAM_CONV_ERR;
170 }
171 }
172 if (reply)
173 *resp = reply;
174 return PAM_SUCCESS;
175}
176
177/*
178 * PAM password change conversation function
179 * Here we assume (for now, at least) that echo on means login name, and
180 * echo off means password.
181 */
182
183static void special_char_sub(char *buf)
184{
185 all_string_sub(buf, "\\n", "", 0);
186 all_string_sub(buf, "\\r", "", 0);
187 all_string_sub(buf, "\\s", " ", 0);
188 all_string_sub(buf, "\\t", "\t", 0);
189}
190
191static void pwd_sub(char *buf, const char *username, const char *oldpass, const char *newpass)
192{
193 fstring_sub(buf, "%u", username);
194 all_string_sub(buf, "%o", oldpass, sizeof(fstring));
195 all_string_sub(buf, "%n", newpass, sizeof(fstring));
196}
197
198
199struct chat_struct {
200 struct chat_struct *next, *prev;
201 fstring prompt;
202 fstring reply;
203};
204
205/**************************************************************
206 Create a linked list containing chat data.
207***************************************************************/
208
209static struct chat_struct *make_pw_chat(const char *p)
210{
211 char *prompt;
212 char *reply;
213 struct chat_struct *list = NULL;
214 struct chat_struct *t;
215 TALLOC_CTX *frame = talloc_stackframe();
216
217 while (1) {
218 t = SMB_MALLOC_P(struct chat_struct);
219 if (!t) {
220 DEBUG(0,("make_pw_chat: malloc failed!\n"));
221 TALLOC_FREE(frame);
222 return NULL;
223 }
224
225 ZERO_STRUCTP(t);
226
227 DLIST_ADD_END(list, t, struct chat_struct*);
228
229 if (!next_token_talloc(frame, &p, &prompt, NULL)) {
230 break;
231 }
232
233 if (strequal(prompt,".")) {
234 fstrcpy(prompt,"*");
235 }
236
237 special_char_sub(prompt);
238 fstrcpy(t->prompt, prompt);
239 strlower_m(t->prompt);
240 trim_char(t->prompt, ' ', ' ');
241
242 if (!next_token_talloc(frame, &p, &reply, NULL)) {
243 break;
244 }
245
246 if (strequal(reply,".")) {
247 fstrcpy(reply,"");
248 }
249
250 special_char_sub(reply);
251 fstrcpy(t->reply, reply);
252 strlower_m(t->reply);
253 trim_char(t->reply, ' ', ' ');
254
255 }
256 TALLOC_FREE(frame);
257 return list;
258}
259
260static void free_pw_chat(struct chat_struct *list)
261{
262 while (list) {
263 struct chat_struct *old_head = list;
264 DLIST_REMOVE(list, list);
265 SAFE_FREE(old_head);
266 }
267}
268
269static int smb_pam_passchange_conv(int num_msg,
270 const struct pam_message **msg,
271 struct pam_response **resp,
272 void *appdata_ptr)
273{
274 int replies = 0;
275 struct pam_response *reply = NULL;
276 fstring current_prompt;
277 fstring current_reply;
278 struct smb_pam_userdata *udp = (struct smb_pam_userdata *)appdata_ptr;
279 struct chat_struct *pw_chat= make_pw_chat(lp_passwd_chat());
280 struct chat_struct *t;
281 bool found;
282 *resp = NULL;
283
284 DEBUG(10,("smb_pam_passchange_conv: starting converstation for %d messages\n", num_msg));
285
286 if (num_msg <= 0)
287 return PAM_CONV_ERR;
288
289 if (pw_chat == NULL)
290 return PAM_CONV_ERR;
291
292 /*
293 * Apparantly HPUX has a buggy PAM that doesn't support the
294 * appdata_ptr. Fail if this is the case. JRA.
295 */
296
297 if (udp == NULL) {
298 DEBUG(0,("smb_pam_passchange_conv: PAM on this system is broken - appdata_ptr == NULL !\n"));
299 free_pw_chat(pw_chat);
300 return PAM_CONV_ERR;
301 }
302
303 reply = SMB_MALLOC_ARRAY(struct pam_response, num_msg);
304 if (!reply) {
305 DEBUG(0,("smb_pam_passchange_conv: malloc for reply failed!\n"));
306 free_pw_chat(pw_chat);
307 return PAM_CONV_ERR;
308 }
309
310 for (replies = 0; replies < num_msg; replies++) {
311 found = False;
312 DEBUG(10,("smb_pam_passchange_conv: Processing message %d\n", replies));
313 switch (msg[replies]->msg_style) {
314 case PAM_PROMPT_ECHO_ON:
315 DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: PAM said: %s\n", msg[replies]->msg));
316 fstrcpy(current_prompt, msg[replies]->msg);
317 trim_char(current_prompt, ' ', ' ');
318 for (t=pw_chat; t; t=t->next) {
319
320 DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: trying to match |%s| to |%s|\n",
321 t->prompt, current_prompt ));
322
323 if (unix_wild_match(t->prompt, current_prompt)) {
324 fstrcpy(current_reply, t->reply);
325 DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: We sent: %s\n", current_reply));
326 pwd_sub(current_reply, udp->PAM_username, udp->PAM_password, udp->PAM_newpassword);
327#ifdef DEBUG_PASSWORD
328 DEBUG(100,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: We actualy sent: %s\n", current_reply));
329#endif
330 reply[replies].resp_retcode = PAM_SUCCESS;
331 reply[replies].resp = COPY_FSTRING(current_reply);
332 found = True;
333 break;
334 }
335 }
336 /* PAM frees resp */
337 if (!found) {
338 DEBUG(3,("smb_pam_passchange_conv: Could not find reply for PAM prompt: %s\n",msg[replies]->msg));
339 free_pw_chat(pw_chat);
340 SAFE_FREE(reply);
341 return PAM_CONV_ERR;
342 }
343 break;
344
345 case PAM_PROMPT_ECHO_OFF:
346 DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: PAM said: %s\n", msg[replies]->msg));
347 fstrcpy(current_prompt, msg[replies]->msg);
348 trim_char(current_prompt, ' ', ' ');
349 for (t=pw_chat; t; t=t->next) {
350
351 DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: trying to match |%s| to |%s|\n",
352 t->prompt, current_prompt ));
353
354 if (unix_wild_match(t->prompt, current_prompt)) {
355 fstrcpy(current_reply, t->reply);
356 DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: We sent: %s\n", current_reply));
357 pwd_sub(current_reply, udp->PAM_username, udp->PAM_password, udp->PAM_newpassword);
358 reply[replies].resp_retcode = PAM_SUCCESS;
359 reply[replies].resp = COPY_FSTRING(current_reply);
360#ifdef DEBUG_PASSWORD
361 DEBUG(100,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: We actualy sent: %s\n", current_reply));
362#endif
363 found = True;
364 break;
365 }
366 }
367 /* PAM frees resp */
368
369 if (!found) {
370 DEBUG(3,("smb_pam_passchange_conv: Could not find reply for PAM prompt: %s\n",msg[replies]->msg));
371 free_pw_chat(pw_chat);
372 SAFE_FREE(reply);
373 return PAM_CONV_ERR;
374 }
375 break;
376
377 case PAM_TEXT_INFO:
378 /* fall through */
379
380 case PAM_ERROR_MSG:
381 /* ignore it... */
382 reply[replies].resp_retcode = PAM_SUCCESS;
383 reply[replies].resp = NULL;
384 break;
385
386 default:
387 /* Must be an error of some sort... */
388 free_pw_chat(pw_chat);
389 SAFE_FREE(reply);
390 return PAM_CONV_ERR;
391 }
392 }
393
394 free_pw_chat(pw_chat);
395 if (reply)
396 *resp = reply;
397 return PAM_SUCCESS;
398}
399
400/***************************************************************************
401 Free up a malloced pam_conv struct.
402****************************************************************************/
403
404static void smb_free_pam_conv(struct pam_conv *pconv)
405{
406 if (pconv)
407 SAFE_FREE(pconv->appdata_ptr);
408
409 SAFE_FREE(pconv);
410}
411
412/***************************************************************************
413 Allocate a pam_conv struct.
414****************************************************************************/
415
416static struct pam_conv *smb_setup_pam_conv(smb_pam_conv_fn smb_pam_conv_fnptr, const char *user,
417 const char *passwd, const char *newpass)
418{
419 struct pam_conv *pconv = SMB_MALLOC_P(struct pam_conv);
420 struct smb_pam_userdata *udp = SMB_MALLOC_P(struct smb_pam_userdata);
421
422 if (pconv == NULL || udp == NULL) {
423 SAFE_FREE(pconv);
424 SAFE_FREE(udp);
425 return NULL;
426 }
427
428 udp->PAM_username = user;
429 udp->PAM_password = passwd;
430 udp->PAM_newpassword = newpass;
431
432 pconv->conv = smb_pam_conv_fnptr;
433 pconv->appdata_ptr = (void *)udp;
434 return pconv;
435}
436
437/*
438 * PAM Closing out cleanup handler
439 */
440
441static bool smb_pam_end(pam_handle_t *pamh, struct pam_conv *smb_pam_conv_ptr)
442{
443 int pam_error;
444
445 smb_free_pam_conv(smb_pam_conv_ptr);
446
447 if( pamh != NULL ) {
448 pam_error = pam_end(pamh, 0);
449 if(smb_pam_error_handler(pamh, pam_error, "End Cleanup Failed", 2) == True) {
450 DEBUG(4, ("smb_pam_end: PAM: PAM_END OK.\n"));
451 return True;
452 }
453 }
454 DEBUG(2,("smb_pam_end: PAM: not initialised"));
455 return False;
456}
457
458/*
459 * Start PAM authentication for specified account
460 */
461
462static bool smb_pam_start(pam_handle_t **pamh, const char *user, const char *rhost, struct pam_conv *pconv)
463{
464 int pam_error;
465 const char *our_rhost;
466 char addr[INET6_ADDRSTRLEN];
467
468 *pamh = (pam_handle_t *)NULL;
469
470 DEBUG(4,("smb_pam_start: PAM: Init user: %s\n", user));
471
472 pam_error = pam_start("samba", user, pconv, pamh);
473 if( !smb_pam_error_handler(*pamh, pam_error, "Init Failed", 0)) {
474 *pamh = (pam_handle_t *)NULL;
475 return False;
476 }
477
478 if (rhost == NULL) {
479 our_rhost = client_name(get_client_fd());
480 if (strequal(our_rhost,"UNKNOWN"))
481 our_rhost = client_addr(get_client_fd(),addr,sizeof(addr));
482 } else {
483 our_rhost = rhost;
484 }
485
486#ifdef PAM_RHOST
487 DEBUG(4,("smb_pam_start: PAM: setting rhost to: %s\n", our_rhost));
488 pam_error = pam_set_item(*pamh, PAM_RHOST, our_rhost);
489 if(!smb_pam_error_handler(*pamh, pam_error, "set rhost failed", 0)) {
490 smb_pam_end(*pamh, pconv);
491 *pamh = (pam_handle_t *)NULL;
492 return False;
493 }
494#endif
495#ifdef PAM_TTY
496 DEBUG(4,("smb_pam_start: PAM: setting tty\n"));
497 pam_error = pam_set_item(*pamh, PAM_TTY, "samba");
498 if (!smb_pam_error_handler(*pamh, pam_error, "set tty failed", 0)) {
499 smb_pam_end(*pamh, pconv);
500 *pamh = (pam_handle_t *)NULL;
501 return False;
502 }
503#endif
504 DEBUG(4,("smb_pam_start: PAM: Init passed for user: %s\n", user));
505 return True;
506}
507
508/*
509 * PAM Authentication Handler
510 */
511static NTSTATUS smb_pam_auth(pam_handle_t *pamh, const char *user)
512{
513 int pam_error;
514 NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
515
516 /*
517 * To enable debugging set in /etc/pam.d/samba:
518 * auth required /lib/security/pam_pwdb.so nullok shadow audit
519 */
520
521 DEBUG(4,("smb_pam_auth: PAM: Authenticate User: %s\n", user));
522 pam_error = pam_authenticate(pamh, PAM_SILENT | lp_null_passwords() ? 0 : PAM_DISALLOW_NULL_AUTHTOK);
523 switch( pam_error ){
524 case PAM_AUTH_ERR:
525 DEBUG(2, ("smb_pam_auth: PAM: Authentication Error for user %s\n", user));
526 break;
527 case PAM_CRED_INSUFFICIENT:
528 DEBUG(2, ("smb_pam_auth: PAM: Insufficient Credentials for user %s\n", user));
529 break;
530 case PAM_AUTHINFO_UNAVAIL:
531 DEBUG(2, ("smb_pam_auth: PAM: Authentication Information Unavailable for user %s\n", user));
532 break;
533 case PAM_USER_UNKNOWN:
534 DEBUG(2, ("smb_pam_auth: PAM: Username %s NOT known to Authentication system\n", user));
535 break;
536 case PAM_MAXTRIES:
537 DEBUG(2, ("smb_pam_auth: PAM: One or more authentication modules reports user limit for user %s exceeeded\n", user));
538 break;
539 case PAM_ABORT:
540 DEBUG(0, ("smb_pam_auth: PAM: One or more PAM modules failed to load for user %s\n", user));
541 break;
542 case PAM_SUCCESS:
543 DEBUG(4, ("smb_pam_auth: PAM: User %s Authenticated OK\n", user));
544 break;
545 default:
546 DEBUG(0, ("smb_pam_auth: PAM: UNKNOWN ERROR while authenticating user %s\n", user));
547 break;
548 }
549
550 smb_pam_nt_status_error_handler(pamh, pam_error, "Authentication Failure", 2, &nt_status);
551 return nt_status;
552}
553
554/*
555 * PAM Account Handler
556 */
557static NTSTATUS smb_pam_account(pam_handle_t *pamh, const char * user)
558{
559 int pam_error;
560 NTSTATUS nt_status = NT_STATUS_ACCOUNT_DISABLED;
561
562 DEBUG(4,("smb_pam_account: PAM: Account Management for User: %s\n", user));
563 pam_error = pam_acct_mgmt(pamh, PAM_SILENT); /* Is user account enabled? */
564 switch( pam_error ) {
565 case PAM_AUTHTOK_EXPIRED:
566 DEBUG(2, ("smb_pam_account: PAM: User %s is valid but password is expired\n", user));
567 break;
568 case PAM_ACCT_EXPIRED:
569 DEBUG(2, ("smb_pam_account: PAM: User %s no longer permitted to access system\n", user));
570 break;
571 case PAM_AUTH_ERR:
572 DEBUG(2, ("smb_pam_account: PAM: There was an authentication error for user %s\n", user));
573 break;
574 case PAM_PERM_DENIED:
575 DEBUG(0, ("smb_pam_account: PAM: User %s is NOT permitted to access system at this time\n", user));
576 break;
577 case PAM_USER_UNKNOWN:
578 DEBUG(0, ("smb_pam_account: PAM: User \"%s\" is NOT known to account management\n", user));
579 break;
580 case PAM_SUCCESS:
581 DEBUG(4, ("smb_pam_account: PAM: Account OK for User: %s\n", user));
582 break;
583 default:
584 DEBUG(0, ("smb_pam_account: PAM: UNKNOWN PAM ERROR (%d) during Account Management for User: %s\n", pam_error, user));
585 break;
586 }
587
588 smb_pam_nt_status_error_handler(pamh, pam_error, "Account Check Failed", 2, &nt_status);
589 return nt_status;
590}
591
592/*
593 * PAM Credential Setting
594 */
595
596static NTSTATUS smb_pam_setcred(pam_handle_t *pamh, const char * user)
597{
598 int pam_error;
599 NTSTATUS nt_status = NT_STATUS_NO_TOKEN;
600
601 /*
602 * This will allow samba to aquire a kerberos token. And, when
603 * exporting an AFS cell, be able to /write/ to this cell.
604 */
605
606 DEBUG(4,("PAM: Account Management SetCredentials for User: %s\n", user));
607 pam_error = pam_setcred(pamh, (PAM_ESTABLISH_CRED|PAM_SILENT));
608 switch( pam_error ) {
609 case PAM_CRED_UNAVAIL:
610 DEBUG(0, ("smb_pam_setcred: PAM: Credentials not found for user:%s\n", user ));
611 break;
612 case PAM_CRED_EXPIRED:
613 DEBUG(0, ("smb_pam_setcred: PAM: Credentials for user: \"%s\" EXPIRED!\n", user ));
614 break;
615 case PAM_USER_UNKNOWN:
616 DEBUG(0, ("smb_pam_setcred: PAM: User: \"%s\" is NOT known so can not set credentials!\n", user ));
617 break;
618 case PAM_CRED_ERR:
619 DEBUG(0, ("smb_pam_setcred: PAM: Unknown setcredentials error - unable to set credentials for %s\n", user ));
620 break;
621 case PAM_SUCCESS:
622 DEBUG(4, ("smb_pam_setcred: PAM: SetCredentials OK for User: %s\n", user));
623 break;
624 default:
625 DEBUG(0, ("smb_pam_setcred: PAM: UNKNOWN PAM ERROR (%d) during SetCredentials for User: %s\n", pam_error, user));
626 break;
627 }
628
629 smb_pam_nt_status_error_handler(pamh, pam_error, "Set Credential Failure", 2, &nt_status);
630 return nt_status;
631}
632
633/*
634 * PAM Internal Session Handler
635 */
636static bool smb_internal_pam_session(pam_handle_t *pamh, const char *user, const char *tty, bool flag)
637{
638 int pam_error;
639
640#ifdef PAM_TTY
641 DEBUG(4,("smb_internal_pam_session: PAM: tty set to: %s\n", tty));
642 pam_error = pam_set_item(pamh, PAM_TTY, tty);
643 if (!smb_pam_error_handler(pamh, pam_error, "set tty failed", 0))
644 return False;
645#endif
646
647 if (flag) {
648 pam_error = pam_open_session(pamh, PAM_SILENT);
649 if (!smb_pam_error_handler(pamh, pam_error, "session setup failed", 0))
650 return False;
651 } else {
652 pam_setcred(pamh, (PAM_DELETE_CRED|PAM_SILENT)); /* We don't care if this fails */
653 pam_error = pam_close_session(pamh, PAM_SILENT); /* This will probably pick up the error anyway */
654 if (!smb_pam_error_handler(pamh, pam_error, "session close failed", 0))
655 return False;
656 }
657 return (True);
658}
659
660/*
661 * Internal PAM Password Changer.
662 */
663
664static bool smb_pam_chauthtok(pam_handle_t *pamh, const char * user)
665{
666 int pam_error;
667
668 DEBUG(4,("smb_pam_chauthtok: PAM: Password Change for User: %s\n", user));
669
670 pam_error = pam_chauthtok(pamh, PAM_SILENT); /* Change Password */
671
672 switch( pam_error ) {
673 case PAM_AUTHTOK_ERR:
674 DEBUG(2, ("PAM: unable to obtain the new authentication token - is password to weak?\n"));
675 break;
676
677 /* This doesn't seem to be defined on Solaris. JRA */
678#ifdef PAM_AUTHTOK_RECOVER_ERR
679 case PAM_AUTHTOK_RECOVER_ERR:
680 DEBUG(2, ("PAM: unable to obtain the old authentication token - was the old password wrong?.\n"));
681 break;
682#endif
683
684 case PAM_AUTHTOK_LOCK_BUSY:
685 DEBUG(2, ("PAM: unable to change the authentication token since it is currently locked.\n"));
686 break;
687 case PAM_AUTHTOK_DISABLE_AGING:
688 DEBUG(2, ("PAM: Authentication token aging has been disabled.\n"));
689 break;
690 case PAM_PERM_DENIED:
691 DEBUG(0, ("PAM: Permission denied.\n"));
692 break;
693 case PAM_TRY_AGAIN:
694 DEBUG(0, ("PAM: Could not update all authentication token(s). No authentication tokens were updated.\n"));
695 break;
696 case PAM_USER_UNKNOWN:
697 DEBUG(0, ("PAM: User not known to PAM\n"));
698 break;
699 case PAM_SUCCESS:
700 DEBUG(4, ("PAM: Account OK for User: %s\n", user));
701 break;
702 default:
703 DEBUG(0, ("PAM: UNKNOWN PAM ERROR (%d) for User: %s\n", pam_error, user));
704 }
705
706 if(!smb_pam_error_handler(pamh, pam_error, "Password Change Failed", 2)) {
707 return False;
708 }
709
710 /* If this point is reached, the password has changed. */
711 return True;
712}
713
714/*
715 * PAM Externally accessible Session handler
716 */
717
718bool smb_pam_claim_session(char *user, char *tty, char *rhost)
719{
720 pam_handle_t *pamh = NULL;
721 struct pam_conv *pconv = NULL;
722
723 /* Ignore PAM if told to. */
724
725 if (!lp_obey_pam_restrictions())
726 return True;
727
728 if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
729 return False;
730
731 if (!smb_pam_start(&pamh, user, rhost, pconv))
732 return False;
733
734 if (!smb_internal_pam_session(pamh, user, tty, True)) {
735 smb_pam_end(pamh, pconv);
736 return False;
737 }
738
739 return smb_pam_end(pamh, pconv);
740}
741
742/*
743 * PAM Externally accessible Session handler
744 */
745
746bool smb_pam_close_session(char *user, char *tty, char *rhost)
747{
748 pam_handle_t *pamh = NULL;
749 struct pam_conv *pconv = NULL;
750
751 /* Ignore PAM if told to. */
752
753 if (!lp_obey_pam_restrictions())
754 return True;
755
756 if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
757 return False;
758
759 if (!smb_pam_start(&pamh, user, rhost, pconv))
760 return False;
761
762 if (!smb_internal_pam_session(pamh, user, tty, False)) {
763 smb_pam_end(pamh, pconv);
764 return False;
765 }
766
767 return smb_pam_end(pamh, pconv);
768}
769
770/*
771 * PAM Externally accessible Account handler
772 */
773
774NTSTATUS smb_pam_accountcheck(const char * user)
775{
776 NTSTATUS nt_status = NT_STATUS_ACCOUNT_DISABLED;
777 pam_handle_t *pamh = NULL;
778 struct pam_conv *pconv = NULL;
779
780 /* Ignore PAM if told to. */
781
782 if (!lp_obey_pam_restrictions())
783 return NT_STATUS_OK;
784
785 if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
786 return NT_STATUS_NO_MEMORY;
787
788 if (!smb_pam_start(&pamh, user, NULL, pconv))
789 return NT_STATUS_ACCOUNT_DISABLED;
790
791 if (!NT_STATUS_IS_OK(nt_status = smb_pam_account(pamh, user)))
792 DEBUG(0, ("smb_pam_accountcheck: PAM: Account Validation Failed - Rejecting User %s!\n", user));
793
794 smb_pam_end(pamh, pconv);
795 return nt_status;
796}
797
798/*
799 * PAM Password Validation Suite
800 */
801
802NTSTATUS smb_pam_passcheck(const char * user, const char * password)
803{
804 pam_handle_t *pamh = NULL;
805 NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
806 struct pam_conv *pconv = NULL;
807
808 /*
809 * Note we can't ignore PAM here as this is the only
810 * way of doing auths on plaintext passwords when
811 * compiled --with-pam.
812 */
813
814 if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, password, NULL)) == NULL)
815 return NT_STATUS_LOGON_FAILURE;
816
817 if (!smb_pam_start(&pamh, user, NULL, pconv))
818 return NT_STATUS_LOGON_FAILURE;
819
820 if (!NT_STATUS_IS_OK(nt_status = smb_pam_auth(pamh, user))) {
821 DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_auth failed - Rejecting User %s !\n", user));
822 smb_pam_end(pamh, pconv);
823 return nt_status;
824 }
825
826 if (!NT_STATUS_IS_OK(nt_status = smb_pam_account(pamh, user))) {
827 DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_account failed - Rejecting User %s !\n", user));
828 smb_pam_end(pamh, pconv);
829 return nt_status;
830 }
831
832 if (!NT_STATUS_IS_OK(nt_status = smb_pam_setcred(pamh, user))) {
833 DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_setcred failed - Rejecting User %s !\n", user));
834 smb_pam_end(pamh, pconv);
835 return nt_status;
836 }
837
838 smb_pam_end(pamh, pconv);
839 return nt_status;
840}
841
842/*
843 * PAM Password Change Suite
844 */
845
846bool smb_pam_passchange(const char * user, const char * oldpassword, const char * newpassword)
847{
848 /* Appropriate quantities of root should be obtained BEFORE calling this function */
849 struct pam_conv *pconv = NULL;
850 pam_handle_t *pamh = NULL;
851
852 if ((pconv = smb_setup_pam_conv(smb_pam_passchange_conv, user, oldpassword, newpassword)) == NULL)
853 return False;
854
855 if(!smb_pam_start(&pamh, user, NULL, pconv))
856 return False;
857
858 if (!smb_pam_chauthtok(pamh, user)) {
859 DEBUG(0, ("smb_pam_passchange: PAM: Password Change Failed for user %s!\n", user));
860 smb_pam_end(pamh, pconv);
861 return False;
862 }
863
864 return smb_pam_end(pamh, pconv);
865}
866
867#else
868
869/* If PAM not used, no PAM restrictions on accounts. */
870NTSTATUS smb_pam_accountcheck(const char * user)
871{
872 return NT_STATUS_OK;
873}
874
875/* If PAM not used, also no PAM restrictions on sessions. */
876bool smb_pam_claim_session(char *user, char *tty, char *rhost)
877{
878 return True;
879}
880
881/* If PAM not used, also no PAM restrictions on sessions. */
882bool smb_pam_close_session(char *in_user, char *tty, char *rhost)
883{
884 return True;
885}
886#endif /* WITH_PAM */
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