Line data Source code
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 : #include "auth.h"
31 : #include "../libcli/auth/pam_errors.h"
32 : #include "lib/util/string_wrappers.h"
33 :
34 : #undef DBGC_CLASS
35 : #define DBGC_CLASS DBGC_AUTH
36 :
37 : #ifdef WITH_PAM
38 :
39 : /*******************************************************************
40 : * Handle PAM authentication
41 : * - Access, Authentication, Session, Password
42 : * Note: See PAM Documentation and refer to local system PAM implementation
43 : * which determines what actions/limitations/allowances become affected.
44 : *********************************************************************/
45 :
46 : #if defined(HAVE_SECURITY_PAM_APPL_H)
47 : #include <security/pam_appl.h>
48 : #elif defined(HAVE_PAM_PAM_APPL_H)
49 : #include <pam/pam_appl.h>
50 : #endif
51 :
52 : /*
53 : * Structure used to communicate between the conversation function
54 : * and the server_login/change password functions.
55 : */
56 :
57 : struct smb_pam_userdata {
58 : const char *PAM_username;
59 : const char *PAM_password;
60 : const char *PAM_newpassword;
61 : };
62 :
63 : typedef int (*smb_pam_conv_fn)(int, const struct pam_message **, struct pam_response **, void *appdata_ptr);
64 :
65 0 : static char *smb_pam_copy_string(const char *s)
66 : {
67 0 : if (s == NULL) {
68 0 : return NULL;
69 : }
70 0 : return SMB_STRDUP(s);
71 : }
72 :
73 0 : static char *smb_pam_copy_fstring(const char *s)
74 : {
75 0 : if (s[0] == '\0') {
76 0 : return NULL;
77 : }
78 0 : return SMB_STRDUP(s);
79 : }
80 :
81 : /*******************************************************************
82 : PAM error handler.
83 : *********************************************************************/
84 :
85 0 : static bool smb_pam_error_handler(pam_handle_t *pamh, int pam_error, const char *msg, int dbglvl)
86 : {
87 :
88 0 : if( pam_error != PAM_SUCCESS) {
89 0 : DEBUG(dbglvl, ("smb_pam_error_handler: PAM: %s : %s\n",
90 : msg, pam_strerror(pamh, pam_error)));
91 0 : return False;
92 : }
93 0 : return True;
94 : }
95 :
96 : /*******************************************************************
97 : This function is a sanity check, to make sure that we NEVER report
98 : failure as sucess.
99 : *********************************************************************/
100 :
101 0 : static bool smb_pam_nt_status_error_handler(pam_handle_t *pamh, int pam_error,
102 : const char *msg, int dbglvl,
103 : NTSTATUS *nt_status)
104 : {
105 0 : *nt_status = pam_to_nt_status(pam_error);
106 :
107 0 : if (smb_pam_error_handler(pamh, pam_error, msg, dbglvl))
108 0 : return True;
109 :
110 0 : if (NT_STATUS_IS_OK(*nt_status)) {
111 : /* Complain LOUDLY */
112 0 : DEBUG(0, ("smb_pam_nt_status_error_handler: PAM: BUG: PAM and NT_STATUS \
113 : error MISMATCH, forcing to NT_STATUS_LOGON_FAILURE"));
114 0 : *nt_status = NT_STATUS_LOGON_FAILURE;
115 : }
116 0 : return False;
117 : }
118 :
119 : /*
120 : * PAM conversation function
121 : * Here we assume (for now, at least) that echo on means login name, and
122 : * echo off means password.
123 : */
124 :
125 0 : static int smb_pam_conv(int num_msg,
126 : const struct pam_message **msg,
127 : struct pam_response **resp,
128 : void *appdata_ptr)
129 : {
130 0 : int replies = 0;
131 0 : struct pam_response *reply = NULL;
132 0 : struct smb_pam_userdata *udp = (struct smb_pam_userdata *)appdata_ptr;
133 :
134 0 : *resp = NULL;
135 :
136 0 : if (num_msg <= 0)
137 0 : return PAM_CONV_ERR;
138 :
139 : /*
140 : * Apparantly HPUX has a buggy PAM that doesn't support the
141 : * appdata_ptr. Fail if this is the case. JRA.
142 : */
143 :
144 0 : if (udp == NULL) {
145 0 : DEBUG(0,("smb_pam_conv: PAM on this system is broken - appdata_ptr == NULL !\n"));
146 0 : return PAM_CONV_ERR;
147 : }
148 :
149 0 : reply = SMB_MALLOC_ARRAY(struct pam_response, num_msg);
150 0 : if (!reply)
151 0 : return PAM_CONV_ERR;
152 :
153 0 : memset(reply, '\0', sizeof(struct pam_response) * num_msg);
154 :
155 0 : for (replies = 0; replies < num_msg; replies++) {
156 0 : switch (msg[replies]->msg_style) {
157 0 : case PAM_PROMPT_ECHO_ON:
158 0 : reply[replies].resp_retcode = PAM_SUCCESS;
159 0 : reply[replies].resp = smb_pam_copy_string(
160 : udp->PAM_username);
161 : /* PAM frees resp */
162 0 : break;
163 :
164 0 : case PAM_PROMPT_ECHO_OFF:
165 0 : reply[replies].resp_retcode = PAM_SUCCESS;
166 0 : reply[replies].resp = smb_pam_copy_string(
167 : udp->PAM_password);
168 : /* PAM frees resp */
169 0 : break;
170 :
171 0 : case PAM_TEXT_INFO:
172 : FALL_THROUGH;
173 :
174 : case PAM_ERROR_MSG:
175 : /* ignore it... */
176 0 : reply[replies].resp_retcode = PAM_SUCCESS;
177 0 : reply[replies].resp = NULL;
178 0 : break;
179 :
180 0 : default:
181 : /* Must be an error of some sort... */
182 0 : SAFE_FREE(reply);
183 0 : return PAM_CONV_ERR;
184 : }
185 : }
186 0 : if (reply)
187 0 : *resp = reply;
188 0 : return PAM_SUCCESS;
189 : }
190 :
191 : /*
192 : * PAM password change conversation function
193 : * Here we assume (for now, at least) that echo on means login name, and
194 : * echo off means password.
195 : */
196 :
197 0 : static void special_char_sub(char *buf)
198 : {
199 0 : all_string_sub(buf, "\\n", "", 0);
200 0 : all_string_sub(buf, "\\r", "", 0);
201 0 : all_string_sub(buf, "\\s", " ", 0);
202 0 : all_string_sub(buf, "\\t", "\t", 0);
203 0 : }
204 :
205 0 : static void pwd_sub(char *buf, const char *username, const char *oldpass, const char *newpass)
206 : {
207 0 : fstring_sub(buf, "%u", username);
208 0 : all_string_sub(buf, "%o", oldpass, sizeof(fstring));
209 0 : all_string_sub(buf, "%n", newpass, sizeof(fstring));
210 0 : }
211 :
212 :
213 : struct chat_struct {
214 : struct chat_struct *next, *prev;
215 : fstring prompt;
216 : fstring reply;
217 : };
218 :
219 : /**************************************************************
220 : Create a linked list containing chat data.
221 : ***************************************************************/
222 :
223 0 : static struct chat_struct *make_pw_chat(const char *p)
224 : {
225 : char *prompt;
226 : char *reply;
227 0 : struct chat_struct *list = NULL;
228 : struct chat_struct *t;
229 0 : TALLOC_CTX *frame = talloc_stackframe();
230 :
231 : while (1) {
232 0 : t = SMB_MALLOC_P(struct chat_struct);
233 0 : if (!t) {
234 0 : DEBUG(0,("make_pw_chat: malloc failed!\n"));
235 0 : TALLOC_FREE(frame);
236 0 : return NULL;
237 : }
238 :
239 0 : ZERO_STRUCTP(t);
240 :
241 0 : DLIST_ADD_END(list, t);
242 :
243 0 : if (!next_token_talloc(frame, &p, &prompt, NULL)) {
244 0 : break;
245 : }
246 :
247 0 : if (strequal(prompt,".")) {
248 0 : fstrcpy(prompt,"*");
249 : }
250 :
251 0 : special_char_sub(prompt);
252 0 : fstrcpy(t->prompt, prompt);
253 0 : (void)strlower_m(t->prompt);
254 0 : trim_char(t->prompt, ' ', ' ');
255 :
256 0 : if (!next_token_talloc(frame, &p, &reply, NULL)) {
257 0 : break;
258 : }
259 :
260 0 : if (strequal(reply,".")) {
261 0 : fstrcpy(reply,"");
262 : }
263 :
264 0 : special_char_sub(reply);
265 0 : fstrcpy(t->reply, reply);
266 0 : (void)strlower_m(t->reply);
267 0 : trim_char(t->reply, ' ', ' ');
268 :
269 : }
270 0 : TALLOC_FREE(frame);
271 0 : return list;
272 : }
273 :
274 0 : static void free_pw_chat(struct chat_struct *list)
275 : {
276 0 : while (list) {
277 0 : struct chat_struct *old_head = list;
278 0 : DLIST_REMOVE(list, list);
279 0 : SAFE_FREE(old_head);
280 : }
281 0 : }
282 :
283 0 : static int smb_pam_passchange_conv(int num_msg,
284 : const struct pam_message **msg,
285 : struct pam_response **resp,
286 : void *appdata_ptr)
287 : {
288 0 : int replies = 0;
289 0 : struct pam_response *reply = NULL;
290 : fstring current_prompt;
291 : fstring current_reply;
292 0 : struct smb_pam_userdata *udp = (struct smb_pam_userdata *)appdata_ptr;
293 : struct chat_struct *pw_chat;
294 : struct chat_struct *t;
295 0 : const struct loadparm_substitution *lp_sub =
296 0 : loadparm_s3_global_substitution();
297 : bool found;
298 0 : *resp = NULL;
299 :
300 0 : DEBUG(10,("smb_pam_passchange_conv: starting converstation for %d messages\n", num_msg));
301 :
302 0 : if (num_msg <= 0)
303 0 : return PAM_CONV_ERR;
304 :
305 0 : if ((pw_chat = make_pw_chat(lp_passwd_chat(talloc_tos(), lp_sub))) == NULL)
306 0 : return PAM_CONV_ERR;
307 :
308 : /*
309 : * Apparantly HPUX has a buggy PAM that doesn't support the
310 : * appdata_ptr. Fail if this is the case. JRA.
311 : */
312 :
313 0 : if (udp == NULL) {
314 0 : DEBUG(0,("smb_pam_passchange_conv: PAM on this system is broken - appdata_ptr == NULL !\n"));
315 0 : free_pw_chat(pw_chat);
316 0 : return PAM_CONV_ERR;
317 : }
318 :
319 0 : reply = SMB_MALLOC_ARRAY(struct pam_response, num_msg);
320 0 : if (!reply) {
321 0 : DEBUG(0,("smb_pam_passchange_conv: malloc for reply failed!\n"));
322 0 : free_pw_chat(pw_chat);
323 0 : return PAM_CONV_ERR;
324 : }
325 :
326 0 : for (replies = 0; replies < num_msg; replies++) {
327 0 : found = False;
328 0 : DEBUG(10,("smb_pam_passchange_conv: Processing message %d\n", replies));
329 0 : switch (msg[replies]->msg_style) {
330 0 : case PAM_PROMPT_ECHO_ON:
331 0 : DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: PAM said: %s\n", msg[replies]->msg));
332 0 : fstrcpy(current_prompt, msg[replies]->msg);
333 0 : trim_char(current_prompt, ' ', ' ');
334 0 : for (t=pw_chat; t; t=t->next) {
335 :
336 0 : DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: trying to match |%s| to |%s|\n",
337 : t->prompt, current_prompt ));
338 :
339 0 : if (unix_wild_match(t->prompt, current_prompt)) {
340 0 : fstrcpy(current_reply, t->reply);
341 0 : DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: We sent: %s\n", current_reply));
342 0 : pwd_sub(current_reply, udp->PAM_username, udp->PAM_password, udp->PAM_newpassword);
343 : #ifdef DEBUG_PASSWORD
344 0 : DEBUG(100,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: We actually sent: %s\n", current_reply));
345 : #endif
346 0 : reply[replies].resp_retcode = PAM_SUCCESS;
347 0 : reply[replies].resp = smb_pam_copy_fstring(
348 : current_reply);
349 0 : found = True;
350 0 : break;
351 : }
352 : }
353 : /* PAM frees resp */
354 0 : if (!found) {
355 0 : DEBUG(3,("smb_pam_passchange_conv: Could not find reply for PAM prompt: %s\n",msg[replies]->msg));
356 0 : free_pw_chat(pw_chat);
357 0 : SAFE_FREE(reply);
358 0 : return PAM_CONV_ERR;
359 : }
360 0 : break;
361 :
362 0 : case PAM_PROMPT_ECHO_OFF:
363 0 : DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: PAM said: %s\n", msg[replies]->msg));
364 0 : fstrcpy(current_prompt, msg[replies]->msg);
365 0 : trim_char(current_prompt, ' ', ' ');
366 0 : for (t=pw_chat; t; t=t->next) {
367 :
368 0 : DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: trying to match |%s| to |%s|\n",
369 : t->prompt, current_prompt ));
370 :
371 0 : if (unix_wild_match(t->prompt, current_prompt)) {
372 0 : fstrcpy(current_reply, t->reply);
373 0 : DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: We sent: %s\n", current_reply));
374 0 : pwd_sub(current_reply, udp->PAM_username, udp->PAM_password, udp->PAM_newpassword);
375 0 : reply[replies].resp_retcode = PAM_SUCCESS;
376 0 : reply[replies].resp = smb_pam_copy_fstring(
377 : current_reply);
378 : #ifdef DEBUG_PASSWORD
379 0 : DEBUG(100,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: We actually sent: %s\n", current_reply));
380 : #endif
381 0 : found = True;
382 0 : break;
383 : }
384 : }
385 : /* PAM frees resp */
386 :
387 0 : if (!found) {
388 0 : DEBUG(3,("smb_pam_passchange_conv: Could not find reply for PAM prompt: %s\n",msg[replies]->msg));
389 0 : free_pw_chat(pw_chat);
390 0 : SAFE_FREE(reply);
391 0 : return PAM_CONV_ERR;
392 : }
393 0 : break;
394 :
395 0 : case PAM_TEXT_INFO:
396 : FALL_THROUGH;
397 :
398 : case PAM_ERROR_MSG:
399 : /* ignore it... */
400 0 : reply[replies].resp_retcode = PAM_SUCCESS;
401 0 : reply[replies].resp = NULL;
402 0 : break;
403 :
404 0 : default:
405 : /* Must be an error of some sort... */
406 0 : free_pw_chat(pw_chat);
407 0 : SAFE_FREE(reply);
408 0 : return PAM_CONV_ERR;
409 : }
410 : }
411 :
412 0 : free_pw_chat(pw_chat);
413 0 : if (reply)
414 0 : *resp = reply;
415 0 : return PAM_SUCCESS;
416 : }
417 :
418 : /***************************************************************************
419 : Free up a malloced pam_conv struct.
420 : ****************************************************************************/
421 :
422 0 : static void smb_free_pam_conv(struct pam_conv *pconv)
423 : {
424 0 : if (pconv)
425 0 : SAFE_FREE(pconv->appdata_ptr);
426 :
427 0 : SAFE_FREE(pconv);
428 0 : }
429 :
430 : /***************************************************************************
431 : Allocate a pam_conv struct.
432 : ****************************************************************************/
433 :
434 0 : static struct pam_conv *smb_setup_pam_conv(smb_pam_conv_fn smb_pam_conv_fnptr, const char *user,
435 : const char *passwd, const char *newpass)
436 : {
437 0 : struct pam_conv *pconv = SMB_MALLOC_P(struct pam_conv);
438 0 : struct smb_pam_userdata *udp = SMB_MALLOC_P(struct smb_pam_userdata);
439 :
440 0 : if (pconv == NULL || udp == NULL) {
441 0 : SAFE_FREE(pconv);
442 0 : SAFE_FREE(udp);
443 0 : return NULL;
444 : }
445 :
446 0 : udp->PAM_username = user;
447 0 : udp->PAM_password = passwd;
448 0 : udp->PAM_newpassword = newpass;
449 :
450 0 : pconv->conv = smb_pam_conv_fnptr;
451 0 : pconv->appdata_ptr = (void *)udp;
452 0 : return pconv;
453 : }
454 :
455 : /*
456 : * PAM Closing out cleanup handler
457 : */
458 :
459 0 : static bool smb_pam_end(pam_handle_t *pamh, struct pam_conv *smb_pam_conv_ptr)
460 : {
461 : int pam_error;
462 :
463 0 : smb_free_pam_conv(smb_pam_conv_ptr);
464 :
465 0 : if( pamh != NULL ) {
466 0 : pam_error = pam_end(pamh, 0);
467 0 : if(smb_pam_error_handler(pamh, pam_error, "End Cleanup Failed", 2) == True) {
468 0 : DEBUG(4, ("smb_pam_end: PAM: PAM_END OK.\n"));
469 0 : return True;
470 : }
471 : }
472 0 : DEBUG(2,("smb_pam_end: PAM: not initialised"));
473 0 : return False;
474 : }
475 :
476 : /*
477 : * Start PAM authentication for specified account
478 : */
479 :
480 0 : static bool smb_pam_start(pam_handle_t **pamh, const char *user, const char *rhost, struct pam_conv *pconv)
481 : {
482 : int pam_error;
483 :
484 0 : *pamh = (pam_handle_t *)NULL;
485 :
486 0 : DEBUG(4,("smb_pam_start: PAM: Init user: %s\n", user));
487 :
488 0 : pam_error = pam_start("samba", user, pconv, pamh);
489 0 : if( !smb_pam_error_handler(*pamh, pam_error, "Init Failed", 0)) {
490 0 : *pamh = (pam_handle_t *)NULL;
491 0 : return False;
492 : }
493 :
494 : #ifdef HAVE_PAM_RHOST
495 0 : DEBUG(4,("smb_pam_start: PAM: setting rhost to: %s\n", rhost));
496 0 : pam_error = pam_set_item(*pamh, PAM_RHOST, rhost);
497 0 : if(!smb_pam_error_handler(*pamh, pam_error, "set rhost failed", 0)) {
498 0 : smb_pam_end(*pamh, pconv);
499 0 : *pamh = (pam_handle_t *)NULL;
500 0 : return False;
501 : }
502 : #endif
503 : #ifdef HAVE_PAM_TTY
504 0 : DEBUG(4,("smb_pam_start: PAM: setting tty\n"));
505 0 : pam_error = pam_set_item(*pamh, PAM_TTY, "samba");
506 0 : if (!smb_pam_error_handler(*pamh, pam_error, "set tty failed", 0)) {
507 0 : smb_pam_end(*pamh, pconv);
508 0 : *pamh = (pam_handle_t *)NULL;
509 0 : return False;
510 : }
511 : #endif
512 0 : DEBUG(4,("smb_pam_start: PAM: Init passed for user: %s\n", user));
513 0 : return True;
514 : }
515 :
516 : /*
517 : * PAM Authentication Handler
518 : */
519 0 : static NTSTATUS smb_pam_auth(pam_handle_t *pamh, const char *user)
520 : {
521 : int pam_error;
522 0 : NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
523 :
524 : /*
525 : * To enable debugging set in /etc/pam.d/samba:
526 : * auth required /lib/security/pam_pwdb.so nullok shadow audit
527 : */
528 :
529 0 : DEBUG(4,("smb_pam_auth: PAM: Authenticate User: %s\n", user));
530 0 : pam_error = pam_authenticate(pamh, PAM_SILENT | (lp_null_passwords() ? 0 : PAM_DISALLOW_NULL_AUTHTOK));
531 0 : switch( pam_error ){
532 0 : case PAM_AUTH_ERR:
533 0 : DEBUG(2, ("smb_pam_auth: PAM: Authentication Error for user %s\n", user));
534 0 : break;
535 0 : case PAM_CRED_INSUFFICIENT:
536 0 : DEBUG(2, ("smb_pam_auth: PAM: Insufficient Credentials for user %s\n", user));
537 0 : break;
538 0 : case PAM_AUTHINFO_UNAVAIL:
539 0 : DEBUG(2, ("smb_pam_auth: PAM: Authentication Information Unavailable for user %s\n", user));
540 0 : break;
541 0 : case PAM_USER_UNKNOWN:
542 0 : DEBUG(2, ("smb_pam_auth: PAM: Username %s NOT known to Authentication system\n", user));
543 0 : break;
544 0 : case PAM_MAXTRIES:
545 0 : DEBUG(2, ("smb_pam_auth: PAM: One or more authentication modules reports user limit for user %s exceeeded\n", user));
546 0 : break;
547 0 : case PAM_ABORT:
548 0 : DEBUG(0, ("smb_pam_auth: PAM: One or more PAM modules failed to load for user %s\n", user));
549 0 : break;
550 0 : case PAM_SUCCESS:
551 0 : DEBUG(4, ("smb_pam_auth: PAM: User %s Authenticated OK\n", user));
552 0 : break;
553 0 : default:
554 0 : DEBUG(0, ("smb_pam_auth: PAM: UNKNOWN ERROR while authenticating user %s\n", user));
555 0 : break;
556 : }
557 :
558 0 : smb_pam_nt_status_error_handler(pamh, pam_error, "Authentication Failure", 2, &nt_status);
559 0 : return nt_status;
560 : }
561 :
562 : /*
563 : * PAM Account Handler
564 : */
565 0 : static NTSTATUS smb_pam_account(pam_handle_t *pamh, const char * user)
566 : {
567 : int pam_error;
568 0 : NTSTATUS nt_status = NT_STATUS_ACCOUNT_DISABLED;
569 :
570 0 : DEBUG(4,("smb_pam_account: PAM: Account Management for User: %s\n", user));
571 0 : pam_error = pam_acct_mgmt(pamh, PAM_SILENT); /* Is user account enabled? */
572 0 : switch( pam_error ) {
573 0 : case PAM_AUTHTOK_EXPIRED:
574 0 : DEBUG(2, ("smb_pam_account: PAM: User %s is valid but password is expired\n", user));
575 0 : break;
576 0 : case PAM_ACCT_EXPIRED:
577 0 : DEBUG(2, ("smb_pam_account: PAM: User %s no longer permitted to access system\n", user));
578 0 : break;
579 0 : case PAM_AUTH_ERR:
580 0 : DEBUG(2, ("smb_pam_account: PAM: There was an authentication error for user %s\n", user));
581 0 : break;
582 0 : case PAM_PERM_DENIED:
583 0 : DEBUG(0, ("smb_pam_account: PAM: User %s is NOT permitted to access system at this time\n", user));
584 0 : break;
585 0 : case PAM_USER_UNKNOWN:
586 0 : DEBUG(0, ("smb_pam_account: PAM: User \"%s\" is NOT known to account management\n", user));
587 0 : break;
588 0 : case PAM_SUCCESS:
589 0 : DEBUG(4, ("smb_pam_account: PAM: Account OK for User: %s\n", user));
590 0 : break;
591 0 : default:
592 0 : DEBUG(0, ("smb_pam_account: PAM: UNKNOWN PAM ERROR (%d) during Account Management for User: %s\n", pam_error, user));
593 0 : break;
594 : }
595 :
596 0 : smb_pam_nt_status_error_handler(pamh, pam_error, "Account Check Failed", 2, &nt_status);
597 0 : return nt_status;
598 : }
599 :
600 : /*
601 : * PAM Credential Setting
602 : */
603 :
604 0 : static NTSTATUS smb_pam_setcred(pam_handle_t *pamh, const char * user)
605 : {
606 : int pam_error;
607 0 : NTSTATUS nt_status = NT_STATUS_NO_TOKEN;
608 :
609 : /*
610 : * This will allow samba to aquire a kerberos token. And, when
611 : * exporting an AFS cell, be able to /write/ to this cell.
612 : */
613 :
614 0 : DEBUG(4,("PAM: Account Management SetCredentials for User: %s\n", user));
615 0 : pam_error = pam_setcred(pamh, (PAM_ESTABLISH_CRED|PAM_SILENT));
616 0 : switch( pam_error ) {
617 0 : case PAM_CRED_UNAVAIL:
618 0 : DEBUG(0, ("smb_pam_setcred: PAM: Credentials not found for user:%s\n", user ));
619 0 : break;
620 0 : case PAM_CRED_EXPIRED:
621 0 : DEBUG(0, ("smb_pam_setcred: PAM: Credentials for user: \"%s\" EXPIRED!\n", user ));
622 0 : break;
623 0 : case PAM_USER_UNKNOWN:
624 0 : DEBUG(0, ("smb_pam_setcred: PAM: User: \"%s\" is NOT known so can not set credentials!\n", user ));
625 0 : break;
626 0 : case PAM_CRED_ERR:
627 0 : DEBUG(0, ("smb_pam_setcred: PAM: Unknown setcredentials error - unable to set credentials for %s\n", user ));
628 0 : break;
629 0 : case PAM_SUCCESS:
630 0 : DEBUG(4, ("smb_pam_setcred: PAM: SetCredentials OK for User: %s\n", user));
631 0 : break;
632 0 : default:
633 0 : DEBUG(0, ("smb_pam_setcred: PAM: UNKNOWN PAM ERROR (%d) during SetCredentials for User: %s\n", pam_error, user));
634 0 : break;
635 : }
636 :
637 0 : smb_pam_nt_status_error_handler(pamh, pam_error, "Set Credential Failure", 2, &nt_status);
638 0 : return nt_status;
639 : }
640 :
641 : /*
642 : * PAM Internal Session Handler
643 : */
644 0 : static bool smb_internal_pam_session(pam_handle_t *pamh, const char *user, const char *tty, bool flag)
645 : {
646 : int pam_error;
647 :
648 : #ifdef HAVE_PAM_TTY
649 0 : DEBUG(4,("smb_internal_pam_session: PAM: tty set to: %s\n", tty));
650 0 : pam_error = pam_set_item(pamh, PAM_TTY, tty);
651 0 : if (!smb_pam_error_handler(pamh, pam_error, "set tty failed", 0))
652 0 : return False;
653 : #endif
654 :
655 0 : if (flag) {
656 0 : pam_error = pam_open_session(pamh, PAM_SILENT);
657 0 : if (!smb_pam_error_handler(pamh, pam_error, "session setup failed", 0))
658 0 : return False;
659 : } else {
660 0 : pam_setcred(pamh, (PAM_DELETE_CRED|PAM_SILENT)); /* We don't care if this fails */
661 0 : pam_error = pam_close_session(pamh, PAM_SILENT); /* This will probably pick up the error anyway */
662 0 : if (!smb_pam_error_handler(pamh, pam_error, "session close failed", 0))
663 0 : return False;
664 : }
665 0 : return (True);
666 : }
667 :
668 : /*
669 : * Internal PAM Password Changer.
670 : */
671 :
672 0 : static bool smb_pam_chauthtok(pam_handle_t *pamh, const char * user)
673 : {
674 : int pam_error;
675 :
676 0 : DEBUG(4,("smb_pam_chauthtok: PAM: Password Change for User: %s\n", user));
677 :
678 0 : pam_error = pam_chauthtok(pamh, PAM_SILENT); /* Change Password */
679 :
680 0 : switch( pam_error ) {
681 0 : case PAM_AUTHTOK_ERR:
682 0 : DEBUG(2, ("PAM: unable to obtain the new authentication token - is password to weak?\n"));
683 0 : break;
684 :
685 : /* This doesn't seem to be defined on Solaris. JRA */
686 : #ifdef PAM_AUTHTOK_RECOVER_ERR
687 0 : case PAM_AUTHTOK_RECOVER_ERR:
688 0 : DEBUG(2, ("PAM: unable to obtain the old authentication token - was the old password wrong?.\n"));
689 0 : break;
690 : #endif
691 :
692 0 : case PAM_AUTHTOK_LOCK_BUSY:
693 0 : DEBUG(2, ("PAM: unable to change the authentication token since it is currently locked.\n"));
694 0 : break;
695 0 : case PAM_AUTHTOK_DISABLE_AGING:
696 0 : DEBUG(2, ("PAM: Authentication token aging has been disabled.\n"));
697 0 : break;
698 0 : case PAM_PERM_DENIED:
699 0 : DEBUG(0, ("PAM: Permission denied.\n"));
700 0 : break;
701 0 : case PAM_TRY_AGAIN:
702 0 : DEBUG(0, ("PAM: Could not update all authentication token(s). No authentication tokens were updated.\n"));
703 0 : break;
704 0 : case PAM_USER_UNKNOWN:
705 0 : DEBUG(0, ("PAM: User not known to PAM\n"));
706 0 : break;
707 0 : case PAM_SUCCESS:
708 0 : DEBUG(4, ("PAM: Account OK for User: %s\n", user));
709 0 : break;
710 0 : default:
711 0 : DEBUG(0, ("PAM: UNKNOWN PAM ERROR (%d) for User: %s\n", pam_error, user));
712 : }
713 :
714 0 : if(!smb_pam_error_handler(pamh, pam_error, "Password Change Failed", 2)) {
715 0 : return False;
716 : }
717 :
718 : /* If this point is reached, the password has changed. */
719 0 : return True;
720 : }
721 :
722 : /*
723 : * PAM Externally accessible Session handler
724 : */
725 :
726 24530 : bool smb_pam_claim_session(const char *user, const char *tty, const char *rhost)
727 : {
728 24530 : pam_handle_t *pamh = NULL;
729 24530 : struct pam_conv *pconv = NULL;
730 :
731 : /* Ignore PAM if told to. */
732 :
733 24530 : if (!lp_obey_pam_restrictions())
734 24010 : return True;
735 :
736 0 : if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
737 0 : return False;
738 :
739 0 : if (!smb_pam_start(&pamh, user, rhost, pconv))
740 0 : return False;
741 :
742 0 : if (!smb_internal_pam_session(pamh, user, tty, True)) {
743 0 : smb_pam_end(pamh, pconv);
744 0 : return False;
745 : }
746 :
747 0 : return smb_pam_end(pamh, pconv);
748 : }
749 :
750 : /*
751 : * PAM Externally accessible Session handler
752 : */
753 :
754 25276 : bool smb_pam_close_session(const char *user, const char *tty, const char *rhost)
755 : {
756 25276 : pam_handle_t *pamh = NULL;
757 25276 : struct pam_conv *pconv = NULL;
758 :
759 : /* Ignore PAM if told to. */
760 :
761 25276 : if (!lp_obey_pam_restrictions())
762 24754 : return True;
763 :
764 0 : if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
765 0 : return False;
766 :
767 0 : if (!smb_pam_start(&pamh, user, rhost, pconv))
768 0 : return False;
769 :
770 0 : if (!smb_internal_pam_session(pamh, user, tty, False)) {
771 0 : smb_pam_end(pamh, pconv);
772 0 : return False;
773 : }
774 :
775 0 : return smb_pam_end(pamh, pconv);
776 : }
777 :
778 : /*
779 : * PAM Externally accessible Account handler
780 : */
781 :
782 18215 : NTSTATUS smb_pam_accountcheck(const char *user, const char *rhost)
783 : {
784 18215 : NTSTATUS nt_status = NT_STATUS_ACCOUNT_DISABLED;
785 18215 : pam_handle_t *pamh = NULL;
786 18215 : struct pam_conv *pconv = NULL;
787 :
788 : /* Ignore PAM if told to. */
789 :
790 18215 : if (!lp_obey_pam_restrictions())
791 18215 : return NT_STATUS_OK;
792 :
793 0 : if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
794 0 : return NT_STATUS_NO_MEMORY;
795 :
796 0 : if (!smb_pam_start(&pamh, user, rhost, pconv))
797 0 : return NT_STATUS_ACCOUNT_DISABLED;
798 :
799 0 : if (!NT_STATUS_IS_OK(nt_status = smb_pam_account(pamh, user)))
800 0 : DEBUG(0, ("smb_pam_accountcheck: PAM: Account Validation Failed - Rejecting User %s!\n", user));
801 :
802 0 : smb_pam_end(pamh, pconv);
803 0 : return nt_status;
804 : }
805 :
806 : /*
807 : * PAM Password Validation Suite
808 : */
809 :
810 0 : NTSTATUS smb_pam_passcheck(const char * user, const char * rhost,
811 : const char * password)
812 : {
813 0 : pam_handle_t *pamh = NULL;
814 0 : NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
815 0 : struct pam_conv *pconv = NULL;
816 :
817 : /*
818 : * Note we can't ignore PAM here as this is the only
819 : * way of doing auths on plaintext passwords when
820 : * compiled --with-pam.
821 : */
822 :
823 0 : if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, password, NULL)) == NULL)
824 0 : return NT_STATUS_LOGON_FAILURE;
825 :
826 0 : if (!smb_pam_start(&pamh, user, rhost, pconv))
827 0 : return NT_STATUS_LOGON_FAILURE;
828 :
829 0 : if (!NT_STATUS_IS_OK(nt_status = smb_pam_auth(pamh, user))) {
830 0 : DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_auth failed - Rejecting User %s !\n", user));
831 0 : smb_pam_end(pamh, pconv);
832 0 : return nt_status;
833 : }
834 :
835 0 : if (!NT_STATUS_IS_OK(nt_status = smb_pam_account(pamh, user))) {
836 0 : DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_account failed - Rejecting User %s !\n", user));
837 0 : smb_pam_end(pamh, pconv);
838 0 : return nt_status;
839 : }
840 :
841 0 : if (!NT_STATUS_IS_OK(nt_status = smb_pam_setcred(pamh, user))) {
842 0 : DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_setcred failed - Rejecting User %s !\n", user));
843 0 : smb_pam_end(pamh, pconv);
844 0 : return nt_status;
845 : }
846 :
847 0 : smb_pam_end(pamh, pconv);
848 0 : return nt_status;
849 : }
850 :
851 : /*
852 : * PAM Password Change Suite
853 : */
854 :
855 0 : bool smb_pam_passchange(const char *user, const char *rhost,
856 : const char *oldpassword, const char *newpassword)
857 : {
858 : /* Appropriate quantities of root should be obtained BEFORE calling this function */
859 0 : struct pam_conv *pconv = NULL;
860 0 : pam_handle_t *pamh = NULL;
861 :
862 0 : if ((pconv = smb_setup_pam_conv(smb_pam_passchange_conv, user, oldpassword, newpassword)) == NULL)
863 0 : return False;
864 :
865 0 : if(!smb_pam_start(&pamh, user, rhost, pconv))
866 0 : return False;
867 :
868 0 : if (!smb_pam_chauthtok(pamh, user)) {
869 0 : DEBUG(0, ("smb_pam_passchange: PAM: Password Change Failed for user %s!\n", user));
870 0 : smb_pam_end(pamh, pconv);
871 0 : return False;
872 : }
873 :
874 0 : return smb_pam_end(pamh, pconv);
875 : }
876 :
877 : #else
878 :
879 : /* If PAM not used, no PAM restrictions on accounts. */
880 : NTSTATUS smb_pam_accountcheck(const char *user, const char *rhost)
881 : {
882 : return NT_STATUS_OK;
883 : }
884 :
885 : /* If PAM not used, also no PAM restrictions on sessions. */
886 : bool smb_pam_claim_session(const char *user, const char *tty, const char *rhost)
887 : {
888 : return True;
889 : }
890 :
891 : /* If PAM not used, also no PAM restrictions on sessions. */
892 : bool smb_pam_close_session(const char *in_user, const char *tty, const char *rhost)
893 : {
894 : return True;
895 : }
896 : #endif /* WITH_PAM */
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