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Create a function out of pam_sm_close_session to delete the credentials.
[Samba.git] / source3 / nsswitch / pam_winbind.c
blob1c927259e529cffe80660d204d2b845956c49281
1 /* pam_winbind module
2
3 Copyright Andrew Tridgell <tridge@samba.org> 2000
4 Copyright Tim Potter <tpot@samba.org> 2000
5 Copyright Andrew Bartlett <abartlet@samba.org> 2002
6 Copyright Guenther Deschner <gd@samba.org> 2005-2008
7
8 largely based on pam_userdb by Cristian Gafton <gafton@redhat.com> also
9 contains large slabs of code from pam_unix by Elliot Lee
10 <sopwith@redhat.com> (see copyright below for full details)
11 */
12
13 #include "pam_winbind.h"
14
15 static int wbc_error_to_pam_error(wbcErr status)
16 {
17 switch (status) {
18 case WBC_ERR_SUCCESS:
19 return PAM_SUCCESS;
20 case WBC_ERR_NOT_IMPLEMENTED:
21 return PAM_SERVICE_ERR;
22 case WBC_ERR_UNKNOWN_FAILURE:
23 break;
24 case WBC_ERR_NO_MEMORY:
25 return PAM_BUF_ERR;
26 case WBC_ERR_INVALID_SID:
27 case WBC_ERR_INVALID_PARAM:
28 break;
29 case WBC_ERR_WINBIND_NOT_AVAILABLE:
30 return PAM_AUTHINFO_UNAVAIL;
31 case WBC_ERR_DOMAIN_NOT_FOUND:
32 return PAM_AUTHINFO_UNAVAIL;
33 case WBC_ERR_INVALID_RESPONSE:
34 return PAM_BUF_ERR;
35 case WBC_ERR_NSS_ERROR:
36 return PAM_USER_UNKNOWN;
37 case WBC_ERR_AUTH_ERROR:
38 return PAM_AUTH_ERR;
39 case WBC_ERR_UNKNOWN_USER:
40 return PAM_USER_UNKNOWN;
41 case WBC_ERR_UNKNOWN_GROUP:
42 return PAM_USER_UNKNOWN;
43 case WBC_ERR_PWD_CHANGE_FAILED:
44 break;
45 }
46
47 /* be paranoid */
48 return PAM_AUTH_ERR;
49 }
50
51 static const char *_pam_error_code_str(int err)
52 {
53 switch (err) {
54 case PAM_SUCCESS:
55 return "PAM_SUCCESS";
56 case PAM_OPEN_ERR:
57 return "PAM_OPEN_ERR";
58 case PAM_SYMBOL_ERR:
59 return "PAM_SYMBOL_ERR";
60 case PAM_SERVICE_ERR:
61 return "PAM_SERVICE_ERR";
62 case PAM_SYSTEM_ERR:
63 return "PAM_SYSTEM_ERR";
64 case PAM_BUF_ERR:
65 return "PAM_BUF_ERR";
66 case PAM_PERM_DENIED:
67 return "PAM_PERM_DENIED";
68 case PAM_AUTH_ERR:
69 return "PAM_AUTH_ERR";
70 case PAM_CRED_INSUFFICIENT:
71 return "PAM_CRED_INSUFFICIENT";
72 case PAM_AUTHINFO_UNAVAIL:
73 return "PAM_AUTHINFO_UNAVAIL";
74 case PAM_USER_UNKNOWN:
75 return "PAM_USER_UNKNOWN";
76 case PAM_MAXTRIES:
77 return "PAM_MAXTRIES";
78 case PAM_NEW_AUTHTOK_REQD:
79 return "PAM_NEW_AUTHTOK_REQD";
80 case PAM_ACCT_EXPIRED:
81 return "PAM_ACCT_EXPIRED";
82 case PAM_SESSION_ERR:
83 return "PAM_SESSION_ERR";
84 case PAM_CRED_UNAVAIL:
85 return "PAM_CRED_UNAVAIL";
86 case PAM_CRED_EXPIRED:
87 return "PAM_CRED_EXPIRED";
88 case PAM_CRED_ERR:
89 return "PAM_CRED_ERR";
90 case PAM_NO_MODULE_DATA:
91 return "PAM_NO_MODULE_DATA";
92 case PAM_CONV_ERR:
93 return "PAM_CONV_ERR";
94 case PAM_AUTHTOK_ERR:
95 return "PAM_AUTHTOK_ERR";
96 case PAM_AUTHTOK_RECOVERY_ERR:
97 return "PAM_AUTHTOK_RECOVERY_ERR";
98 case PAM_AUTHTOK_LOCK_BUSY:
99 return "PAM_AUTHTOK_LOCK_BUSY";
100 case PAM_AUTHTOK_DISABLE_AGING:
101 return "PAM_AUTHTOK_DISABLE_AGING";
102 case PAM_TRY_AGAIN:
103 return "PAM_TRY_AGAIN";
104 case PAM_IGNORE:
105 return "PAM_IGNORE";
106 case PAM_ABORT:
107 return "PAM_ABORT";
108 case PAM_AUTHTOK_EXPIRED:
109 return "PAM_AUTHTOK_EXPIRED";
110 #ifdef PAM_MODULE_UNKNOWN
111 case PAM_MODULE_UNKNOWN:
112 return "PAM_MODULE_UNKNOWN";
113 #endif
114 #ifdef PAM_BAD_ITEM
115 case PAM_BAD_ITEM:
116 return "PAM_BAD_ITEM";
117 #endif
118 #ifdef PAM_CONV_AGAIN
119 case PAM_CONV_AGAIN:
120 return "PAM_CONV_AGAIN";
121 #endif
122 #ifdef PAM_INCOMPLETE
123 case PAM_INCOMPLETE:
124 return "PAM_INCOMPLETE";
125 #endif
126 default:
127 return NULL;
128 }
129 }
130
131 #define _PAM_LOG_FUNCTION_ENTER(function, ctx) \
132 do { \
133 _pam_log_debug(ctx, LOG_DEBUG, "[pamh: %p] ENTER: " \
134 function " (flags: 0x%04x)", ctx->pamh, ctx->flags); \
135 _pam_log_state(ctx); \
136 } while (0)
137
138 #define _PAM_LOG_FUNCTION_LEAVE(function, ctx, retval) \
139 do { \
140 _pam_log_debug(ctx, LOG_DEBUG, "[pamh: %p] LEAVE: " \
141 function " returning %d (%s)", ctx->pamh, retval, \
142 _pam_error_code_str(retval)); \
143 _pam_log_state(ctx); \
144 } while (0)
145
146 /* data tokens */
147
148 #define MAX_PASSWD_TRIES 3
149
150 /*
151 * Work around the pam API that has functions with void ** as parameters
152 * These lead to strict aliasing warnings with gcc.
153 */
154 static int _pam_get_item(const pam_handle_t *pamh,
155 int item_type,
156 const void *_item)
157 {
158 const void **item = (const void **)_item;
159 return pam_get_item(pamh, item_type, item);
160 }
161 static int _pam_get_data(const pam_handle_t *pamh,
162 const char *module_data_name,
163 const void *_data)
164 {
165 const void **data = (const void **)_data;
166 return pam_get_data(pamh, module_data_name, data);
167 }
168
169 /* some syslogging */
170
171 #ifdef HAVE_PAM_VSYSLOG
172 static void _pam_log_int(const pam_handle_t *pamh,
173 int err,
174 const char *format,
175 va_list args)
176 {
177 pam_vsyslog(pamh, err, format, args);
178 }
179 #else
180 static void _pam_log_int(const pam_handle_t *pamh,
181 int err,
182 const char *format,
183 va_list args)
184 {
185 char *format2 = NULL;
186 const char *service;
187
188 _pam_get_item(pamh, PAM_SERVICE, &service);
189
190 format2 = (char *)malloc(strlen(MODULE_NAME)+strlen(format)+strlen(service)+5);
191 if (format2 == NULL) {
192 /* what else todo ? */
193 vsyslog(err, format, args);
194 return;
195 }
196
197 sprintf(format2, "%s(%s): %s", MODULE_NAME, service, format);
198 vsyslog(err, format2, args);
199 SAFE_FREE(format2);
200 }
201 #endif /* HAVE_PAM_VSYSLOG */
202
203 static bool _pam_log_is_silent(int ctrl)
204 {
205 return on(ctrl, WINBIND_SILENT);
206 }
207
208 static void _pam_log(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
209 static void _pam_log(struct pwb_context *r, int err, const char *format, ...)
210 {
211 va_list args;
212
213 if (_pam_log_is_silent(r->ctrl)) {
214 return;
215 }
216
217 va_start(args, format);
218 _pam_log_int(r->pamh, err, format, args);
219 va_end(args);
220 }
221 static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
222 static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
223 {
224 va_list args;
225
226 if (_pam_log_is_silent(ctrl)) {
227 return;
228 }
229
230 va_start(args, format);
231 _pam_log_int(pamh, err, format, args);
232 va_end(args);
233 }
234
235 static bool _pam_log_is_debug_enabled(int ctrl)
236 {
237 if (ctrl == -1) {
238 return false;
239 }
240
241 if (_pam_log_is_silent(ctrl)) {
242 return false;
243 }
244
245 if (!(ctrl & WINBIND_DEBUG_ARG)) {
246 return false;
247 }
248
249 return true;
250 }
251
252 static bool _pam_log_is_debug_state_enabled(int ctrl)
253 {
254 if (!(ctrl & WINBIND_DEBUG_STATE)) {
255 return false;
256 }
257
258 return _pam_log_is_debug_enabled(ctrl);
259 }
260
261 static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
262 static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...)
263 {
264 va_list args;
265
266 if (!_pam_log_is_debug_enabled(r->ctrl)) {
267 return;
268 }
269
270 va_start(args, format);
271 _pam_log_int(r->pamh, err, format, args);
272 va_end(args);
273 }
274 static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
275 static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
276 {
277 va_list args;
278
279 if (!_pam_log_is_debug_enabled(ctrl)) {
280 return;
281 }
282
283 va_start(args, format);
284 _pam_log_int(pamh, err, format, args);
285 va_end(args);
286 }
287
288 static void _pam_log_state_datum(struct pwb_context *ctx,
289 int item_type,
290 const char *key,
291 int is_string)
292 {
293 const void *data = NULL;
294 if (item_type != 0) {
295 pam_get_item(ctx->pamh, item_type, &data);
296 } else {
297 pam_get_data(ctx->pamh, key, &data);
298 }
299 if (data != NULL) {
300 const char *type = (item_type != 0) ? "ITEM" : "DATA";
301 if (is_string != 0) {
302 _pam_log_debug(ctx, LOG_DEBUG,
303 "[pamh: %p] STATE: %s(%s) = \"%s\" (%p)",
304 ctx->pamh, type, key, (const char *)data,
305 data);
306 } else {
307 _pam_log_debug(ctx, LOG_DEBUG,
308 "[pamh: %p] STATE: %s(%s) = %p",
309 ctx->pamh, type, key, data);
310 }
311 }
312 }
313
314 #define _PAM_LOG_STATE_DATA_POINTER(ctx, module_data_name) \
315 _pam_log_state_datum(ctx, 0, module_data_name, 0)
316
317 #define _PAM_LOG_STATE_DATA_STRING(ctx, module_data_name) \
318 _pam_log_state_datum(ctx, 0, module_data_name, 1)
319
320 #define _PAM_LOG_STATE_ITEM_POINTER(ctx, item_type) \
321 _pam_log_state_datum(ctx, item_type, #item_type, 0)
322
323 #define _PAM_LOG_STATE_ITEM_STRING(ctx, item_type) \
324 _pam_log_state_datum(ctx, item_type, #item_type, 1)
325
326 #ifdef DEBUG_PASSWORD
327 #define _LOG_PASSWORD_AS_STRING 1
328 #else
329 #define _LOG_PASSWORD_AS_STRING 0
330 #endif
331
332 #define _PAM_LOG_STATE_ITEM_PASSWORD(ctx, item_type) \
333 _pam_log_state_datum(ctx, item_type, #item_type, \
334 _LOG_PASSWORD_AS_STRING)
335
336 static void _pam_log_state(struct pwb_context *ctx)
337 {
338 if (!_pam_log_is_debug_state_enabled(ctx->ctrl)) {
339 return;
340 }
341
342 _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_SERVICE);
343 _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER);
344 _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_TTY);
345 _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RHOST);
346 _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RUSER);
347 _PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_OLDAUTHTOK);
348 _PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_AUTHTOK);
349 _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER_PROMPT);
350 _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_CONV);
351 #ifdef PAM_FAIL_DELAY
352 _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_FAIL_DELAY);
353 #endif
354 #ifdef PAM_REPOSITORY
355 _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_REPOSITORY);
356 #endif
357
358 _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_HOMEDIR);
359 _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSCRIPT);
360 _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSERVER);
361 _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_PROFILEPATH);
362 _PAM_LOG_STATE_DATA_STRING(ctx,
363 PAM_WINBIND_NEW_AUTHTOK_REQD);
364 /* Use atoi to get PAM result code */
365 _PAM_LOG_STATE_DATA_STRING(ctx,
366 PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH);
367 _PAM_LOG_STATE_DATA_POINTER(ctx, PAM_WINBIND_PWD_LAST_SET);
368 }
369
370 static int _pam_parse(const pam_handle_t *pamh,
371 int flags,
372 int argc,
373 const char **argv,
374 dictionary **result_d)
375 {
376 int ctrl = 0;
377 const char *config_file = NULL;
378 int i;
379 const char **v;
380 dictionary *d = NULL;
381
382 if (flags & PAM_SILENT) {
383 ctrl |= WINBIND_SILENT;
384 }
385
386 for (i=argc,v=argv; i-- > 0; ++v) {
387 if (!strncasecmp(*v, "config", strlen("config"))) {
388 ctrl |= WINBIND_CONFIG_FILE;
389 config_file = v[i];
390 break;
391 }
392 }
393
394 if (config_file == NULL) {
395 config_file = PAM_WINBIND_CONFIG_FILE;
396 }
397
398 d = iniparser_load(config_file);
399 if (d == NULL) {
400 goto config_from_pam;
401 }
402
403 if (iniparser_getboolean(d, "global:debug", false)) {
404 ctrl |= WINBIND_DEBUG_ARG;
405 }
406
407 if (iniparser_getboolean(d, "global:debug_state", false)) {
408 ctrl |= WINBIND_DEBUG_STATE;
409 }
410
411 if (iniparser_getboolean(d, "global:cached_login", false)) {
412 ctrl |= WINBIND_CACHED_LOGIN;
413 }
414
415 if (iniparser_getboolean(d, "global:krb5_auth", false)) {
416 ctrl |= WINBIND_KRB5_AUTH;
417 }
418
419 if (iniparser_getboolean(d, "global:silent", false)) {
420 ctrl |= WINBIND_SILENT;
421 }
422
423 if (iniparser_getstr(d, "global:krb5_ccache_type") != NULL) {
424 ctrl |= WINBIND_KRB5_CCACHE_TYPE;
425 }
426
427 if ((iniparser_getstr(d, "global:require-membership-of") != NULL) ||
428 (iniparser_getstr(d, "global:require_membership_of") != NULL)) {
429 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
430 }
431
432 if (iniparser_getboolean(d, "global:try_first_pass", false)) {
433 ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
434 }
435
436 if (iniparser_getint(d, "global:warn_pwd_expire", 0)) {
437 ctrl |= WINBIND_WARN_PWD_EXPIRE;
438 }
439
440 if (iniparser_getboolean(d, "global:mkhomedir", false)) {
441 ctrl |= WINBIND_MKHOMEDIR;
442 }
443
444 config_from_pam:
445 /* step through arguments */
446 for (i=argc,v=argv; i-- > 0; ++v) {
447
448 /* generic options */
449 if (!strcmp(*v,"debug"))
450 ctrl |= WINBIND_DEBUG_ARG;
451 else if (!strcasecmp(*v, "debug_state"))
452 ctrl |= WINBIND_DEBUG_STATE;
453 else if (!strcasecmp(*v, "silent"))
454 ctrl |= WINBIND_SILENT;
455 else if (!strcasecmp(*v, "use_authtok"))
456 ctrl |= WINBIND_USE_AUTHTOK_ARG;
457 else if (!strcasecmp(*v, "use_first_pass"))
458 ctrl |= WINBIND_USE_FIRST_PASS_ARG;
459 else if (!strcasecmp(*v, "try_first_pass"))
460 ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
461 else if (!strcasecmp(*v, "unknown_ok"))
462 ctrl |= WINBIND_UNKNOWN_OK_ARG;
463 else if (!strncasecmp(*v, "require_membership_of",
464 strlen("require_membership_of")))
465 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
466 else if (!strncasecmp(*v, "require-membership-of",
467 strlen("require-membership-of")))
468 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
469 else if (!strcasecmp(*v, "krb5_auth"))
470 ctrl |= WINBIND_KRB5_AUTH;
471 else if (!strncasecmp(*v, "krb5_ccache_type",
472 strlen("krb5_ccache_type")))
473 ctrl |= WINBIND_KRB5_CCACHE_TYPE;
474 else if (!strcasecmp(*v, "cached_login"))
475 ctrl |= WINBIND_CACHED_LOGIN;
476 else if (!strcasecmp(*v, "mkhomedir"))
477 ctrl |= WINBIND_MKHOMEDIR;
478 else {
479 __pam_log(pamh, ctrl, LOG_ERR,
480 "pam_parse: unknown option: %s", *v);
481 return -1;
482 }
483
484 }
485
486 if (result_d) {
487 *result_d = d;
488 } else {
489 if (d) {
490 iniparser_freedict(d);
491 }
492 }
493
494 return ctrl;
495 };
496
497 static int _pam_winbind_free_context(struct pwb_context *ctx)
498 {
499 if (!ctx) {
500 return 0;
501 }
502
503 if (ctx->dict) {
504 iniparser_freedict(ctx->dict);
505 }
506
507 return 0;
508 }
509
510 static int _pam_winbind_init_context(pam_handle_t *pamh,
511 int flags,
512 int argc,
513 const char **argv,
514 struct pwb_context **ctx_p)
515 {
516 struct pwb_context *r = NULL;
517
518 r = TALLOC_ZERO_P(NULL, struct pwb_context);
519 if (!r) {
520 return PAM_BUF_ERR;
521 }
522
523 talloc_set_destructor(r, _pam_winbind_free_context);
524
525 r->pamh = pamh;
526 r->flags = flags;
527 r->argc = argc;
528 r->argv = argv;
529 r->ctrl = _pam_parse(pamh, flags, argc, argv, &r->dict);
530 if (r->ctrl == -1) {
531 TALLOC_FREE(r);
532 return PAM_SYSTEM_ERR;
533 }
534
535 *ctx_p = r;
536
537 return PAM_SUCCESS;
538 }
539
540 static void _pam_winbind_cleanup_func(pam_handle_t *pamh,
541 void *data,
542 int error_status)
543 {
544 int ctrl = _pam_parse(pamh, 0, 0, NULL, NULL);
545 if (_pam_log_is_debug_state_enabled(ctrl)) {
546 __pam_log_debug(pamh, ctrl, LOG_DEBUG,
547 "[pamh: %p] CLEAN: cleaning up PAM data %p "
548 "(error_status = %d)", pamh, data,
549 error_status);
550 }
551 TALLOC_FREE(data);
552 }
553
554
555 static const struct ntstatus_errors {
556 const char *ntstatus_string;
557 const char *error_string;
558 } ntstatus_errors[] = {
559 {"NT_STATUS_OK",
560 "Success"},
561 {"NT_STATUS_BACKUP_CONTROLLER",
562 "No primary Domain Controler available"},
563 {"NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
564 "No domain controllers found"},
565 {"NT_STATUS_NO_LOGON_SERVERS",
566 "No logon servers"},
567 {"NT_STATUS_PWD_TOO_SHORT",
568 "Password too short"},
569 {"NT_STATUS_PWD_TOO_RECENT",
570 "The password of this user is too recent to change"},
571 {"NT_STATUS_PWD_HISTORY_CONFLICT",
572 "Password is already in password history"},
573 {"NT_STATUS_PASSWORD_EXPIRED",
574 "Your password has expired"},
575 {"NT_STATUS_PASSWORD_MUST_CHANGE",
576 "You need to change your password now"},
577 {"NT_STATUS_INVALID_WORKSTATION",
578 "You are not allowed to logon from this workstation"},
579 {"NT_STATUS_INVALID_LOGON_HOURS",
580 "You are not allowed to logon at this time"},
581 {"NT_STATUS_ACCOUNT_EXPIRED",
582 "Your account has expired. "
583 "Please contact your System administrator"}, /* SCNR */
584 {"NT_STATUS_ACCOUNT_DISABLED",
585 "Your account is disabled. "
586 "Please contact your System administrator"}, /* SCNR */
587 {"NT_STATUS_ACCOUNT_LOCKED_OUT",
588 "Your account has been locked. "
589 "Please contact your System administrator"}, /* SCNR */
590 {"NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
591 "Invalid Trust Account"},
592 {"NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
593 "Invalid Trust Account"},
594 {"NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
595 "Invalid Trust Account"},
596 {"NT_STATUS_ACCESS_DENIED",
597 "Access is denied"},
598 {NULL, NULL}
599 };
600
601 static const char *_get_ntstatus_error_string(const char *nt_status_string)
602 {
603 int i;
604 for (i=0; ntstatus_errors[i].ntstatus_string != NULL; i++) {
605 if (!strcasecmp(ntstatus_errors[i].ntstatus_string,
606 nt_status_string)) {
607 return ntstatus_errors[i].error_string;
608 }
609 }
610 return NULL;
611 }
612
613 /* --- authentication management functions --- */
614
615 /* Attempt a conversation */
616
617 static int converse(const pam_handle_t *pamh,
618 int nargs,
619 struct pam_message **message,
620 struct pam_response **response)
621 {
622 int retval;
623 struct pam_conv *conv;
624
625 retval = _pam_get_item(pamh, PAM_CONV, &conv);
626 if (retval == PAM_SUCCESS) {
627 retval = conv->conv(nargs,
628 (const struct pam_message **)message,
629 response, conv->appdata_ptr);
630 }
631
632 return retval; /* propagate error status */
633 }
634
635
636 static int _make_remark(struct pwb_context *ctx,
637 int type,
638 const char *text)
639 {
640 int retval = PAM_SUCCESS;
641
642 struct pam_message *pmsg[1], msg[1];
643 struct pam_response *resp;
644
645 if (ctx->flags & WINBIND_SILENT) {
646 return PAM_SUCCESS;
647 }
648
649 pmsg[0] = &msg[0];
650 msg[0].msg = discard_const_p(char, text);
651 msg[0].msg_style = type;
652
653 resp = NULL;
654 retval = converse(ctx->pamh, 1, pmsg, &resp);
655
656 if (resp) {
657 _pam_drop_reply(resp, 1);
658 }
659 return retval;
660 }
661
662 static int _make_remark_v(struct pwb_context *ctx,
663 int type,
664 const char *format,
665 va_list args)
666 {
667 char *var;
668 int ret;
669
670 ret = vasprintf(&var, format, args);
671 if (ret < 0) {
672 _pam_log(ctx, LOG_ERR, "memory allocation failure");
673 return ret;
674 }
675
676 ret = _make_remark(ctx, type, var);
677 SAFE_FREE(var);
678 return ret;
679 }
680
681 static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
682 static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...)
683 {
684 int ret;
685 va_list args;
686
687 va_start(args, format);
688 ret = _make_remark_v(ctx, type, format, args);
689 va_end(args);
690 return ret;
691 }
692
693 static int pam_winbind_request_log(struct pwb_context *ctx,
694 int retval,
695 const char *user,
696 const char *fn)
697 {
698 switch (retval) {
699 case PAM_AUTH_ERR:
700 /* incorrect password */
701 _pam_log(ctx, LOG_WARNING, "user '%s' denied access "
702 "(incorrect password or invalid membership)", user);
703 return retval;
704 case PAM_ACCT_EXPIRED:
705 /* account expired */
706 _pam_log(ctx, LOG_WARNING, "user '%s' account expired",
707 user);
708 return retval;
709 case PAM_AUTHTOK_EXPIRED:
710 /* password expired */
711 _pam_log(ctx, LOG_WARNING, "user '%s' password expired",
712 user);
713 return retval;
714 case PAM_NEW_AUTHTOK_REQD:
715 /* new password required */
716 _pam_log(ctx, LOG_WARNING, "user '%s' new password "
717 "required", user);
718 return retval;
719 case PAM_USER_UNKNOWN:
720 /* the user does not exist */
721 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
722 user);
723 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
724 return PAM_IGNORE;
725 }
726 return retval;
727 case PAM_SUCCESS:
728 /* Otherwise, the authentication looked good */
729 if (strcmp(fn, "wbcLogonUser") == 0) {
730 _pam_log(ctx, LOG_NOTICE,
731 "user '%s' granted access", user);
732 } else {
733 _pam_log(ctx, LOG_NOTICE,
734 "user '%s' OK", user);
735 }
736 return retval;
737 default:
738 /* we don't know anything about this return value */
739 _pam_log(ctx, LOG_ERR,
740 "internal module error (retval = %s(%d), user = '%s')",
741 _pam_error_code_str(retval), retval, user);
742 return retval;
743 }
744 }
745
746 static int wbc_auth_error_to_pam_error(struct pwb_context *ctx,
747 struct wbcAuthErrorInfo *e,
748 wbcErr status,
749 const char *username,
750 const char *fn)
751 {
752 int ret = PAM_AUTH_ERR;
753
754 if (WBC_ERROR_IS_OK(status)) {
755 _pam_log_debug(ctx, LOG_DEBUG, "request %s succeeded",
756 fn);
757 ret = PAM_SUCCESS;
758 return pam_winbind_request_log(ctx, ret, username, fn);
759 }
760
761 if (e) {
762 if (e->pam_error != PAM_SUCCESS) {
763 _pam_log(ctx, LOG_ERR,
764 "request %s failed: %s, "
765 "PAM error: %s (%d), NTSTATUS: %s, "
766 "Error message was: %s",
767 fn,
768 wbcErrorString(status),
769 _pam_error_code_str(e->pam_error),
770 e->pam_error,
771 e->nt_string,
772 e->display_string);
773 ret = e->pam_error;
774 return pam_winbind_request_log(ctx, ret, username, fn);
775 }
776
777 _pam_log(ctx, LOG_ERR, "request %s failed, but PAM error 0!", fn);
778
779 ret = PAM_SERVICE_ERR;
780 return pam_winbind_request_log(ctx, ret, username, fn);
781 }
782
783 ret = wbc_error_to_pam_error(status);
784 return pam_winbind_request_log(ctx, ret, username, fn);
785 }
786
787
788 /**
789 * send a password expiry message if required
790 *
791 * @param ctx PAM winbind context.
792 * @param next_change expected (calculated) next expiry date.
793 * @param already_expired pointer to a boolean to indicate if the password is
794 * already expired.
795 *
796 * @return boolean Returns true if message has been sent, false if not.
797 */
798
799 static bool _pam_send_password_expiry_message(struct pwb_context *ctx,
800 time_t next_change,
801 time_t now,
802 int warn_pwd_expire,
803 bool *already_expired)
804 {
805 int days = 0;
806 struct tm tm_now, tm_next_change;
807
808 if (already_expired) {
809 *already_expired = false;
810 }
811
812 if (next_change <= now) {
813 PAM_WB_REMARK_DIRECT(ctx, "NT_STATUS_PASSWORD_EXPIRED");
814 if (already_expired) {
815 *already_expired = true;
816 }
817 return true;
818 }
819
820 if ((next_change < 0) ||
821 (next_change > now + warn_pwd_expire * SECONDS_PER_DAY)) {
822 return false;
823 }
824
825 if ((localtime_r(&now, &tm_now) == NULL) ||
826 (localtime_r(&next_change, &tm_next_change) == NULL)) {
827 return false;
828 }
829
830 days = (tm_next_change.tm_yday+tm_next_change.tm_year*365) -
831 (tm_now.tm_yday+tm_now.tm_year*365);
832
833 if (days == 0) {
834 _make_remark(ctx, PAM_TEXT_INFO,
835 "Your password expires today");
836 return true;
837 }
838
839 if (days > 0 && days < warn_pwd_expire) {
840 _make_remark_format(ctx, PAM_TEXT_INFO,
841 "Your password will expire in %d %s",
842 days, (days > 1) ? "days":"day");
843 return true;
844 }
845
846 return false;
847 }
848
849 /**
850 * Send a warning if the password expires in the near future
851 *
852 * @param ctx PAM winbind context.
853 * @param response The full authentication response structure.
854 * @param already_expired boolean, is the pwd already expired?
855 *
856 * @return void.
857 */
858
859 static void _pam_warn_password_expiry(struct pwb_context *ctx,
860 const struct wbcAuthUserInfo *info,
861 const struct wbcUserPasswordPolicyInfo *policy,
862 int warn_pwd_expire,
863 bool *already_expired)
864 {
865 time_t now = time(NULL);
866 time_t next_change = 0;
867
868 if (!info || !policy) {
869 return;
870 }
871
872 if (already_expired) {
873 *already_expired = false;
874 }
875
876 /* accounts with WBC_ACB_PWNOEXP set never receive a warning */
877 if (info->acct_flags & WBC_ACB_PWNOEXP) {
878 return;
879 }
880
881 /* no point in sending a warning if this is a grace logon */
882 if (PAM_WB_GRACE_LOGON(info->user_flags)) {
883 return;
884 }
885
886 /* check if the info3 must change timestamp has been set */
887 next_change = info->pass_must_change_time;
888
889 if (_pam_send_password_expiry_message(ctx, next_change, now,
890 warn_pwd_expire,
891 already_expired)) {
892 return;
893 }
894
895 /* now check for the global password policy */
896 /* good catch from Ralf Haferkamp: an expiry of "never" is translated
897 * to -1 */
898 if (policy->expire <= 0) {
899 return;
900 }
901
902 next_change = info->pass_last_set_time + policy->expire;
903
904 if (_pam_send_password_expiry_message(ctx, next_change, now,
905 warn_pwd_expire,
906 already_expired)) {
907 return;
908 }
909
910 /* no warning sent */
911 }
912
913 #define IS_SID_STRING(name) (strncmp("S-", name, 2) == 0)
914
915 /**
916 * Append a string, making sure not to overflow and to always return a
917 * NULL-terminated string.
918 *
919 * @param dest Destination string buffer (must already be NULL-terminated).
920 * @param src Source string buffer.
921 * @param dest_buffer_size Size of dest buffer in bytes.
922 *
923 * @return false if dest buffer is not big enough (no bytes copied), true on
924 * success.
925 */
926
927 static bool safe_append_string(char *dest,
928 const char *src,
929 int dest_buffer_size)
930 {
931 int dest_length = strlen(dest);
932 int src_length = strlen(src);
933
934 if (dest_length + src_length + 1 > dest_buffer_size) {
935 return false;
936 }
937
938 memcpy(dest + dest_length, src, src_length + 1);
939 return true;
940 }
941
942 /**
943 * Convert a names into a SID string, appending it to a buffer.
944 *
945 * @param ctx PAM winbind context.
946 * @param user User in PAM request.
947 * @param name Name to convert.
948 * @param sid_list_buffer Where to append the string sid.
949 * @param sid_list_buffer Size of sid_list_buffer (in bytes).
950 *
951 * @return false on failure, true on success.
952 */
953 static bool winbind_name_to_sid_string(struct pwb_context *ctx,
954 const char *user,
955 const char *name,
956 char *sid_list_buffer,
957 int sid_list_buffer_size)
958 {
959 const char* sid_string;
960
961 /* lookup name? */
962 if (IS_SID_STRING(name)) {
963 sid_string = name;
964 } else {
965 wbcErr wbc_status;
966 struct wbcDomainSid sid;
967 enum wbcSidType type;
968 char *sid_str;
969
970 _pam_log_debug(ctx, LOG_DEBUG,
971 "no sid given, looking up: %s\n", name);
972
973 wbc_status = wbcLookupName("", name, &sid, &type);
974 if (!WBC_ERROR_IS_OK(wbc_status)) {
975 _pam_log(ctx, LOG_INFO,
976 "could not lookup name: %s\n", name);
977 return false;
978 }
979
980 wbc_status = wbcSidToString(&sid, &sid_str);
981 if (!WBC_ERROR_IS_OK(wbc_status)) {
982 return false;
983 }
984
985 wbcFreeMemory(sid_str);
986 sid_string = sid_str;
987 }
988
989 if (!safe_append_string(sid_list_buffer, sid_string,
990 sid_list_buffer_size)) {
991 return false;
992 }
993
994 return true;
995 }
996
997 /**
998 * Convert a list of names into a list of sids.
999 *
1000 * @param ctx PAM winbind context.
1001 * @param user User in PAM request.
1002 * @param name_list List of names or string sids, separated by commas.
1003 * @param sid_list_buffer Where to put the list of string sids.
1004 * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1005 *
1006 * @return false on failure, true on success.
1007 */
1008 static bool winbind_name_list_to_sid_string_list(struct pwb_context *ctx,
1009 const char *user,
1010 const char *name_list,
1011 char *sid_list_buffer,
1012 int sid_list_buffer_size)
1013 {
1014 bool result = false;
1015 char *current_name = NULL;
1016 const char *search_location;
1017 const char *comma;
1018
1019 if (sid_list_buffer_size > 0) {
1020 sid_list_buffer[0] = 0;
1021 }
1022
1023 search_location = name_list;
1024 while ((comma = strstr(search_location, ",")) != NULL) {
1025 current_name = strndup(search_location,
1026 comma - search_location);
1027 if (NULL == current_name) {
1028 goto out;
1029 }
1030
1031 if (!winbind_name_to_sid_string(ctx, user,
1032 current_name,
1033 sid_list_buffer,
1034 sid_list_buffer_size)) {
1035 goto out;
1036 }
1037
1038 SAFE_FREE(current_name);
1039
1040 if (!safe_append_string(sid_list_buffer, ",",
1041 sid_list_buffer_size)) {
1042 goto out;
1043 }
1044
1045 search_location = comma + 1;
1046 }
1047
1048 if (!winbind_name_to_sid_string(ctx, user, search_location,
1049 sid_list_buffer,
1050 sid_list_buffer_size)) {
1051 goto out;
1052 }
1053
1054 result = true;
1055
1056 out:
1057 SAFE_FREE(current_name);
1058 return result;
1059 }
1060
1061 /**
1062 * put krb5ccname variable into environment
1063 *
1064 * @param ctx PAM winbind context.
1065 * @param krb5ccname env variable retrieved from winbindd.
1066 *
1067 * @return void.
1068 */
1069
1070 static void _pam_setup_krb5_env(struct pwb_context *ctx,
1071 struct wbcLogonUserInfo *info)
1072 {
1073 char var[PATH_MAX];
1074 int ret;
1075 uint32_t i;
1076 const char *krb5ccname = NULL;
1077
1078 if (off(ctx->ctrl, WINBIND_KRB5_AUTH)) {
1079 return;
1080 }
1081
1082 if (!info) {
1083 return;
1084 }
1085
1086 for (i=0; i < info->num_blobs; i++) {
1087 if (strcasecmp(info->blobs[i].name, "krb5ccname") == 0) {
1088 krb5ccname = (const char *)info->blobs[i].blob.data;
1089 break;
1090 }
1091 }
1092
1093 if (!krb5ccname || (strlen(krb5ccname) == 0)) {
1094 return;
1095 }
1096
1097 _pam_log_debug(ctx, LOG_DEBUG,
1098 "request returned KRB5CCNAME: %s", krb5ccname);
1099
1100 if (snprintf(var, sizeof(var), "KRB5CCNAME=%s", krb5ccname) == -1) {
1101 return;
1102 }
1103
1104 ret = pam_putenv(ctx->pamh, var);
1105 if (ret) {
1106 _pam_log(ctx, LOG_ERR,
1107 "failed to set KRB5CCNAME to %s: %s",
1108 var, pam_strerror(ctx->pamh, ret));
1109 }
1110 }
1111
1112 /**
1113 * Copy unix username if available (further processed in PAM).
1114 *
1115 * @param ctx PAM winbind context
1116 * @param user_ret A pointer that holds a pointer to a string
1117 * @param unix_username A username
1118 *
1119 * @return void.
1120 */
1121
1122 static void _pam_setup_unix_username(struct pwb_context *ctx,
1123 char **user_ret,
1124 struct wbcLogonUserInfo *info)
1125 {
1126 const char *unix_username = NULL;
1127 uint32_t i;
1128
1129 if (!user_ret || !info) {
1130 return;
1131 }
1132
1133 for (i=0; i < info->num_blobs; i++) {
1134 if (strcasecmp(info->blobs[i].name, "unix_username") == 0) {
1135 unix_username = (const char *)info->blobs[i].blob.data;
1136 break;
1137 }
1138 }
1139
1140 if (!unix_username || !unix_username[0]) {
1141 return;
1142 }
1143
1144 *user_ret = strdup(unix_username);
1145 }
1146
1147 /**
1148 * Set string into the PAM stack.
1149 *
1150 * @param ctx PAM winbind context.
1151 * @param data_name Key name for pam_set_data.
1152 * @param value String value.
1153 *
1154 * @return void.
1155 */
1156
1157 static void _pam_set_data_string(struct pwb_context *ctx,
1158 const char *data_name,
1159 const char *value)
1160 {
1161 int ret;
1162
1163 if (!data_name || !value || (strlen(data_name) == 0) ||
1164 (strlen(value) == 0)) {
1165 return;
1166 }
1167
1168 ret = pam_set_data(ctx->pamh, data_name, talloc_strdup(NULL, value),
1169 _pam_winbind_cleanup_func);
1170 if (ret) {
1171 _pam_log_debug(ctx, LOG_DEBUG,
1172 "Could not set data %s: %s\n",
1173 data_name, pam_strerror(ctx->pamh, ret));
1174 }
1175 }
1176
1177 /**
1178 * Set info3 strings into the PAM stack.
1179 *
1180 * @param ctx PAM winbind context.
1181 * @param data_name Key name for pam_set_data.
1182 * @param value String value.
1183 *
1184 * @return void.
1185 */
1186
1187 static void _pam_set_data_info3(struct pwb_context *ctx,
1188 const struct wbcAuthUserInfo *info)
1189 {
1190 _pam_set_data_string(ctx, PAM_WINBIND_HOMEDIR,
1191 info->home_directory);
1192 _pam_set_data_string(ctx, PAM_WINBIND_LOGONSCRIPT,
1193 info->logon_script);
1194 _pam_set_data_string(ctx, PAM_WINBIND_LOGONSERVER,
1195 info->logon_server);
1196 _pam_set_data_string(ctx, PAM_WINBIND_PROFILEPATH,
1197 info->profile_path);
1198 }
1199
1200 /**
1201 * Free info3 strings in the PAM stack.
1202 *
1203 * @param pamh PAM handle
1204 *
1205 * @return void.
1206 */
1207
1208 static void _pam_free_data_info3(pam_handle_t *pamh)
1209 {
1210 pam_set_data(pamh, PAM_WINBIND_HOMEDIR, NULL, NULL);
1211 pam_set_data(pamh, PAM_WINBIND_LOGONSCRIPT, NULL, NULL);
1212 pam_set_data(pamh, PAM_WINBIND_LOGONSERVER, NULL, NULL);
1213 pam_set_data(pamh, PAM_WINBIND_PROFILEPATH, NULL, NULL);
1214 }
1215
1216 /**
1217 * Send PAM_ERROR_MSG for cached or grace logons.
1218 *
1219 * @param ctx PAM winbind context.
1220 * @param username User in PAM request.
1221 * @param info3_user_flgs Info3 flags containing logon type bits.
1222 *
1223 * @return void.
1224 */
1225
1226 static void _pam_warn_logon_type(struct pwb_context *ctx,
1227 const char *username,
1228 uint32_t info3_user_flgs)
1229 {
1230 /* inform about logon type */
1231 if (PAM_WB_GRACE_LOGON(info3_user_flgs)) {
1232
1233 _make_remark(ctx, PAM_ERROR_MSG,
1234 "Grace login. "
1235 "Please change your password as soon you're "
1236 "online again");
1237 _pam_log_debug(ctx, LOG_DEBUG,
1238 "User %s logged on using grace logon\n",
1239 username);
1240
1241 } else if (PAM_WB_CACHED_LOGON(info3_user_flgs)) {
1242
1243 _make_remark(ctx, PAM_ERROR_MSG,
1244 "Domain Controller unreachable, "
1245 "using cached credentials instead. "
1246 "Network resources may be unavailable");
1247 _pam_log_debug(ctx, LOG_DEBUG,
1248 "User %s logged on using cached credentials\n",
1249 username);
1250 }
1251 }
1252
1253 /**
1254 * Send PAM_ERROR_MSG for krb5 errors.
1255 *
1256 * @param ctx PAM winbind context.
1257 * @param username User in PAM request.
1258 * @param info3_user_flgs Info3 flags containing logon type bits.
1259 *
1260 * @return void.
1261 */
1262
1263 static void _pam_warn_krb5_failure(struct pwb_context *ctx,
1264 const char *username,
1265 uint32_t info3_user_flgs)
1266 {
1267 if (PAM_WB_KRB5_CLOCK_SKEW(info3_user_flgs)) {
1268 _make_remark(ctx, PAM_ERROR_MSG,
1269 "Failed to establish your Kerberos Ticket cache "
1270 "due time differences\n"
1271 "with the domain controller. "
1272 "Please verify the system time.\n");
1273 _pam_log_debug(ctx, LOG_DEBUG,
1274 "User %s: Clock skew when getting Krb5 TGT\n",
1275 username);
1276 }
1277 }
1278
1279 static bool _pam_check_remark_auth_err(struct pwb_context *ctx,
1280 const struct wbcAuthErrorInfo *e,
1281 const char *nt_status_string,
1282 int *pam_error)
1283 {
1284 const char *ntstatus = NULL;
1285 const char *error_string = NULL;
1286
1287 if (!e || !pam_error) {
1288 return false;
1289 }
1290
1291 ntstatus = e->nt_string;
1292 if (!ntstatus) {
1293 return false;
1294 }
1295
1296 if (strcasecmp(ntstatus, nt_status_string) == 0) {
1297
1298 error_string = _get_ntstatus_error_string(nt_status_string);
1299 if (error_string) {
1300 _make_remark(ctx, PAM_ERROR_MSG, error_string);
1301 *pam_error = e->pam_error;
1302 return true;
1303 }
1304
1305 if (e->display_string) {
1306 _make_remark(ctx, PAM_ERROR_MSG, e->display_string);
1307 *pam_error = e->pam_error;
1308 return true;
1309 }
1310
1311 _make_remark(ctx, PAM_ERROR_MSG, nt_status_string);
1312 *pam_error = e->pam_error;
1313
1314 return true;
1315 }
1316
1317 return false;
1318 };
1319
1320 /**
1321 * Compose Password Restriction String for a PAM_ERROR_MSG conversation.
1322 *
1323 * @param i The wbcUserPasswordPolicyInfo struct.
1324 *
1325 * @return string (caller needs to talloc_free).
1326 */
1327
1328 static char *_pam_compose_pwd_restriction_string(struct pwb_context *ctx,
1329 struct wbcUserPasswordPolicyInfo *i)
1330 {
1331 char *str = NULL;
1332
1333 if (!i) {
1334 goto failed;
1335 }
1336
1337 str = talloc_asprintf(ctx, "Your password ");
1338 if (!str) {
1339 goto failed;
1340 }
1341
1342 if (i->min_length_password > 0) {
1343 str = talloc_asprintf_append(str,
1344 "must be at least %d characters; ",
1345 i->min_length_password);
1346 if (!str) {
1347 goto failed;
1348 }
1349 }
1350
1351 if (i->password_history > 0) {
1352 str = talloc_asprintf_append(str,
1353 "cannot repeat any of your previous %d "
1354 "passwords; ",
1355 i->password_history);
1356 if (!str) {
1357 goto failed;
1358 }
1359 }
1360
1361 if (i->password_properties & WBC_DOMAIN_PASSWORD_COMPLEX) {
1362 str = talloc_asprintf_append(str,
1363 "must contain capitals, numerals "
1364 "or punctuation; "
1365 "and cannot contain your account "
1366 "or full name; ");
1367 if (!str) {
1368 goto failed;
1369 }
1370 }
1371
1372 str = talloc_asprintf_append(str,
1373 "Please type a different password. "
1374 "Type a password which meets these requirements in "
1375 "both text boxes.");
1376 if (!str) {
1377 goto failed;
1378 }
1379
1380 return str;
1381
1382 failed:
1383 TALLOC_FREE(str);
1384 return NULL;
1385 }
1386
1387 static int _pam_create_homedir(struct pwb_context *ctx,
1388 const char *dirname,
1389 mode_t mode)
1390 {
1391 struct stat sbuf;
1392
1393 if (stat(dirname, &sbuf) == 0) {
1394 return PAM_SUCCESS;
1395 }
1396
1397 if (mkdir(dirname, mode) != 0) {
1398
1399 _make_remark_format(ctx, PAM_TEXT_INFO,
1400 "Creating directory: %s failed: %s",
1401 dirname, strerror(errno));
1402 _pam_log(ctx, LOG_ERR, "could not create dir: %s (%s)",
1403 dirname, strerror(errno));
1404 return PAM_PERM_DENIED;
1405 }
1406
1407 return PAM_SUCCESS;
1408 }
1409
1410 static int _pam_chown_homedir(struct pwb_context *ctx,
1411 const char *dirname,
1412 uid_t uid,
1413 gid_t gid)
1414 {
1415 if (chown(dirname, uid, gid) != 0) {
1416 _pam_log(ctx, LOG_ERR, "failed to chown user homedir: %s (%s)",
1417 dirname, strerror(errno));
1418 return PAM_PERM_DENIED;
1419 }
1420
1421 return PAM_SUCCESS;
1422 }
1423
1424 static int _pam_mkhomedir(struct pwb_context *ctx)
1425 {
1426 struct passwd *pwd = NULL;
1427 char *token = NULL;
1428 char *create_dir = NULL;
1429 char *user_dir = NULL;
1430 int ret;
1431 const char *username;
1432 mode_t mode = 0700;
1433 char *safe_ptr = NULL;
1434 char *p = NULL;
1435
1436 /* Get the username */
1437 ret = pam_get_user(ctx->pamh, &username, NULL);
1438 if ((ret != PAM_SUCCESS) || (!username)) {
1439 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1440 return PAM_SERVICE_ERR;
1441 }
1442
1443 pwd = getpwnam(username);
1444 if (pwd == NULL) {
1445 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1446 return PAM_USER_UNKNOWN;
1447 }
1448 _pam_log_debug(ctx, LOG_DEBUG, "homedir is: %s", pwd->pw_dir);
1449
1450 ret = _pam_create_homedir(ctx, pwd->pw_dir, 0700);
1451 if (ret == PAM_SUCCESS) {
1452 ret = _pam_chown_homedir(ctx, pwd->pw_dir,
1453 pwd->pw_uid,
1454 pwd->pw_gid);
1455 }
1456
1457 if (ret == PAM_SUCCESS) {
1458 return ret;
1459 }
1460
1461 /* maybe we need to create parent dirs */
1462 create_dir = talloc_strdup(ctx, "/");
1463 if (!create_dir) {
1464 return PAM_BUF_ERR;
1465 }
1466
1467 /* find final directory */
1468 user_dir = strrchr(pwd->pw_dir, '/');
1469 if (!user_dir) {
1470 return PAM_BUF_ERR;
1471 }
1472 user_dir++;
1473
1474 _pam_log(ctx, LOG_DEBUG, "final directory: %s", user_dir);
1475
1476 p = pwd->pw_dir;
1477
1478 while ((token = strtok_r(p, "/", &safe_ptr)) != NULL) {
1479
1480 mode = 0755;
1481
1482 p = NULL;
1483
1484 _pam_log_debug(ctx, LOG_DEBUG, "token is %s", token);
1485
1486 create_dir = talloc_asprintf_append(create_dir, "%s/", token);
1487 if (!create_dir) {
1488 return PAM_BUF_ERR;
1489 }
1490 _pam_log_debug(ctx, LOG_DEBUG, "current_dir is %s", create_dir);
1491
1492 if (strcmp(token, user_dir) == 0) {
1493 _pam_log_debug(ctx, LOG_DEBUG, "assuming last directory: %s", token);
1494 mode = 0700;
1495 }
1496
1497 ret = _pam_create_homedir(ctx, create_dir, mode);
1498 if (ret) {
1499 return ret;
1500 }
1501 }
1502
1503 return _pam_chown_homedir(ctx, create_dir,
1504 pwd->pw_uid,
1505 pwd->pw_gid);
1506 }
1507
1508 /* talk to winbindd */
1509 static int winbind_auth_request(struct pwb_context *ctx,
1510 const char *user,
1511 const char *pass,
1512 const char *member,
1513 const char *cctype,
1514 const int warn_pwd_expire,
1515 struct wbcAuthErrorInfo **p_error,
1516 struct wbcLogonUserInfo **p_info,
1517 struct wbcUserPasswordPolicyInfo **p_policy,
1518 time_t *pwd_last_set,
1519 char **user_ret)
1520 {
1521 wbcErr wbc_status;
1522
1523 struct wbcLogonUserParams logon;
1524 char membership_of[1024];
1525 uid_t user_uid = -1;
1526 uint32_t flags = WBFLAG_PAM_INFO3_TEXT |
1527 WBFLAG_PAM_GET_PWD_POLICY;
1528
1529 struct wbcLogonUserInfo *info = NULL;
1530 struct wbcAuthUserInfo *user_info = NULL;
1531 struct wbcAuthErrorInfo *error = NULL;
1532 struct wbcUserPasswordPolicyInfo *policy = NULL;
1533
1534 int ret = PAM_AUTH_ERR;
1535 int i;
1536 const char *codes[] = {
1537 "NT_STATUS_PASSWORD_EXPIRED",
1538 "NT_STATUS_PASSWORD_MUST_CHANGE",
1539 "NT_STATUS_INVALID_WORKSTATION",
1540 "NT_STATUS_INVALID_LOGON_HOURS",
1541 "NT_STATUS_ACCOUNT_EXPIRED",
1542 "NT_STATUS_ACCOUNT_DISABLED",
1543 "NT_STATUS_ACCOUNT_LOCKED_OUT",
1544 "NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
1545 "NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
1546 "NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
1547 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1548 "NT_STATUS_NO_LOGON_SERVERS",
1549 "NT_STATUS_WRONG_PASSWORD",
1550 "NT_STATUS_ACCESS_DENIED"
1551 };
1552
1553 if (pwd_last_set) {
1554 *pwd_last_set = 0;
1555 }
1556
1557 /* Krb5 auth always has to go against the KDC of the user's realm */
1558
1559 if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1560 flags |= WBFLAG_PAM_CONTACT_TRUSTDOM;
1561 }
1562
1563 if (ctx->ctrl & (WINBIND_KRB5_AUTH|WINBIND_CACHED_LOGIN)) {
1564 struct passwd *pwd = NULL;
1565
1566 pwd = getpwnam(user);
1567 if (pwd == NULL) {
1568 return PAM_USER_UNKNOWN;
1569 }
1570 user_uid = pwd->pw_uid;
1571 }
1572
1573 if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1574
1575 _pam_log_debug(ctx, LOG_DEBUG,
1576 "enabling krb5 login flag\n");
1577
1578 flags |= WBFLAG_PAM_KRB5 |
1579 WBFLAG_PAM_FALLBACK_AFTER_KRB5;
1580 }
1581
1582 if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1583 _pam_log_debug(ctx, LOG_DEBUG,
1584 "enabling cached login flag\n");
1585 flags |= WBFLAG_PAM_CACHED_LOGIN;
1586 }
1587
1588 if (user_ret) {
1589 *user_ret = NULL;
1590 flags |= WBFLAG_PAM_UNIX_NAME;
1591 }
1592
1593 if (cctype != NULL) {
1594 _pam_log_debug(ctx, LOG_DEBUG,
1595 "enabling request for a %s krb5 ccache\n",
1596 cctype);
1597 }
1598
1599 if (member != NULL) {
1600
1601 ZERO_STRUCT(membership_of);
1602
1603 if (!winbind_name_list_to_sid_string_list(ctx, user, member,
1604 membership_of,
1605 sizeof(membership_of))) {
1606 _pam_log_debug(ctx, LOG_ERR,
1607 "failed to serialize membership of sid "
1608 "\"%s\"\n", member);
1609 return PAM_AUTH_ERR;
1610 }
1611 }
1612
1613 ZERO_STRUCT(logon);
1614
1615 logon.username = user;
1616 logon.password = pass;
1617
1618 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1619 &logon.blobs,
1620 "krb5_cc_type",
1621 0,
1622 (uint8_t *)cctype,
1623 strlen(cctype)+1);
1624 if (!WBC_ERROR_IS_OK(wbc_status)) {
1625 goto done;
1626 }
1627
1628 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1629 &logon.blobs,
1630 "flags",
1631 0,
1632 (uint8_t *)&flags,
1633 sizeof(flags));
1634 if (!WBC_ERROR_IS_OK(wbc_status)) {
1635 goto done;
1636 }
1637
1638 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1639 &logon.blobs,
1640 "user_uid",
1641 0,
1642 (uint8_t *)&user_uid,
1643 sizeof(user_uid));
1644 if (!WBC_ERROR_IS_OK(wbc_status)) {
1645 goto done;
1646 }
1647
1648 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1649 &logon.blobs,
1650 "membership_of",
1651 0,
1652 (uint8_t *)membership_of,
1653 sizeof(membership_of));
1654 if (!WBC_ERROR_IS_OK(wbc_status)) {
1655 goto done;
1656 }
1657
1658 wbc_status = wbcLogonUser(&logon, &info, &error, &policy);
1659 ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1660 user, "wbcLogonUser");
1661 wbcFreeMemory(logon.blobs);
1662 logon.blobs = NULL;
1663
1664 if (info && info->info) {
1665 user_info = info->info;
1666 }
1667
1668 if (pwd_last_set && user_info) {
1669 *pwd_last_set = user_info->pass_last_set_time;
1670 }
1671
1672 if (p_info && info) {
1673 *p_info = info;
1674 }
1675
1676 if (p_policy && policy) {
1677 *p_policy = policy;
1678 }
1679
1680 if (p_error && error) {
1681 /* We want to process the error in the caller. */
1682 *p_error = error;
1683 return ret;
1684 }
1685
1686 for (i=0; i<ARRAY_SIZE(codes); i++) {
1687 int _ret = ret;
1688 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1689 ret = _ret;
1690 goto done;
1691 }
1692 }
1693
1694 if ((ret == PAM_SUCCESS) && user_info && policy && info) {
1695
1696 bool already_expired = false;
1697
1698 /* warn a user if the password is about to expire soon */
1699 _pam_warn_password_expiry(ctx, user_info, policy,
1700 warn_pwd_expire,
1701 &already_expired);
1702
1703 if (already_expired == true) {
1704
1705 SMB_TIME_T last_set = user_info->pass_last_set_time;
1706
1707 _pam_log_debug(ctx, LOG_DEBUG,
1708 "Password has expired "
1709 "(Password was last set: %lld, "
1710 "the policy says it should expire here "
1711 "%lld (now it's: %lu))\n",
1712 (long long int)last_set,
1713 (long long int)last_set +
1714 policy->expire,
1715 time(NULL));
1716
1717 return PAM_AUTHTOK_EXPIRED;
1718 }
1719
1720 /* inform about logon type */
1721 _pam_warn_logon_type(ctx, user, user_info->user_flags);
1722
1723 /* inform about krb5 failures */
1724 _pam_warn_krb5_failure(ctx, user, user_info->user_flags);
1725
1726 /* set some info3 info for other modules in the stack */
1727 _pam_set_data_info3(ctx, user_info);
1728
1729 /* put krb5ccname into env */
1730 _pam_setup_krb5_env(ctx, info);
1731
1732 /* If winbindd returned a username, return the pointer to it
1733 * here. */
1734 _pam_setup_unix_username(ctx, user_ret, info);
1735 }
1736
1737 done:
1738 if (logon.blobs) {
1739 wbcFreeMemory(logon.blobs);
1740 }
1741 if (info && info->blobs) {
1742 wbcFreeMemory(info->blobs);
1743 }
1744 if (error && !p_error) {
1745 wbcFreeMemory(error);
1746 }
1747 if (info && !p_info) {
1748 wbcFreeMemory(info);
1749 }
1750 if (policy && !p_policy) {
1751 wbcFreeMemory(policy);
1752 }
1753
1754 return ret;
1755 }
1756
1757 /* talk to winbindd */
1758 static int winbind_chauthtok_request(struct pwb_context *ctx,
1759 const char *user,
1760 const char *oldpass,
1761 const char *newpass,
1762 time_t pwd_last_set)
1763 {
1764 wbcErr wbc_status;
1765 struct wbcChangePasswordParams params;
1766 struct wbcAuthErrorInfo *error = NULL;
1767 struct wbcUserPasswordPolicyInfo *policy = NULL;
1768 enum wbcPasswordChangeRejectReason reject_reason = -1;
1769 uint32_t flags = 0;
1770
1771 int i;
1772 const char *codes[] = {
1773 "NT_STATUS_BACKUP_CONTROLLER",
1774 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1775 "NT_STATUS_NO_LOGON_SERVERS",
1776 "NT_STATUS_ACCESS_DENIED",
1777 "NT_STATUS_PWD_TOO_SHORT", /* TODO: tell the min pwd length ? */
1778 "NT_STATUS_PWD_TOO_RECENT", /* TODO: tell the minage ? */
1779 "NT_STATUS_PWD_HISTORY_CONFLICT" /* TODO: tell the history length ? */
1780 };
1781 int ret = PAM_AUTH_ERR;
1782
1783 ZERO_STRUCT(params);
1784
1785 if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1786 flags |= WBFLAG_PAM_KRB5 |
1787 WBFLAG_PAM_CONTACT_TRUSTDOM;
1788 }
1789
1790 if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1791 flags |= WBFLAG_PAM_CACHED_LOGIN;
1792 }
1793
1794 params.account_name = user;
1795 params.level = WBC_AUTH_USER_LEVEL_PLAIN;
1796 params.old_password.plaintext = oldpass;
1797 params.new_password.plaintext = newpass;
1798 params.flags = flags;
1799
1800 wbc_status = wbcChangeUserPasswordEx(&params, &error, &reject_reason, &policy);
1801 ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1802 user, "wbcChangeUserPasswordEx");
1803
1804 if (WBC_ERROR_IS_OK(wbc_status)) {
1805 _pam_log(ctx, LOG_NOTICE,
1806 "user '%s' password changed", user);
1807 return PAM_SUCCESS;
1808 }
1809
1810 if (!error) {
1811 wbcFreeMemory(policy);
1812 return ret;
1813 }
1814
1815 for (i=0; i<ARRAY_SIZE(codes); i++) {
1816 int _ret = ret;
1817 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1818 ret = _ret;
1819 goto done;
1820 }
1821 }
1822
1823 if (!strcasecmp(error->nt_string,
1824 "NT_STATUS_PASSWORD_RESTRICTION")) {
1825
1826 char *pwd_restriction_string = NULL;
1827 SMB_TIME_T min_pwd_age = 0;
1828
1829 if (policy) {
1830 min_pwd_age = policy->min_passwordage;
1831 }
1832
1833 /* FIXME: avoid to send multiple PAM messages after another */
1834 switch (reject_reason) {
1835 case -1:
1836 break;
1837 case WBC_PWD_CHANGE_REJECT_OTHER:
1838 if ((min_pwd_age > 0) &&
1839 (pwd_last_set + min_pwd_age > time(NULL))) {
1840 PAM_WB_REMARK_DIRECT(ctx,
1841 "NT_STATUS_PWD_TOO_RECENT");
1842 }
1843 break;
1844 case WBC_PWD_CHANGE_REJECT_TOO_SHORT:
1845 PAM_WB_REMARK_DIRECT(ctx,
1846 "NT_STATUS_PWD_TOO_SHORT");
1847 break;
1848 case WBC_PWD_CHANGE_REJECT_IN_HISTORY:
1849 PAM_WB_REMARK_DIRECT(ctx,
1850 "NT_STATUS_PWD_HISTORY_CONFLICT");
1851 break;
1852 case WBC_PWD_CHANGE_REJECT_COMPLEXITY:
1853 _make_remark(ctx, PAM_ERROR_MSG,
1854 "Password does not meet "
1855 "complexity requirements");
1856 break;
1857 default:
1858 _pam_log_debug(ctx, LOG_DEBUG,
1859 "unknown password change "
1860 "reject reason: %d",
1861 reject_reason);
1862 break;
1863 }
1864
1865 pwd_restriction_string =
1866 _pam_compose_pwd_restriction_string(ctx, policy);
1867 if (pwd_restriction_string) {
1868 _make_remark(ctx, PAM_ERROR_MSG,
1869 pwd_restriction_string);
1870 TALLOC_FREE(pwd_restriction_string);
1871 }
1872 }
1873 done:
1874 wbcFreeMemory(error);
1875 wbcFreeMemory(policy);
1876
1877 return ret;
1878 }
1879
1880 /*
1881 * Checks if a user has an account
1882 *
1883 * return values:
1884 * 1 = User not found
1885 * 0 = OK
1886 * -1 = System error
1887 */
1888 static int valid_user(struct pwb_context *ctx,
1889 const char *user)
1890 {
1891 /* check not only if the user is available over NSS calls, also make
1892 * sure it's really a winbind user, this is important when stacking PAM
1893 * modules in the 'account' or 'password' facility. */
1894
1895 wbcErr wbc_status;
1896 struct passwd *pwd = NULL;
1897 struct passwd *wb_pwd = NULL;
1898
1899 pwd = getpwnam(user);
1900 if (pwd == NULL) {
1901 return 1;
1902 }
1903
1904 wbc_status = wbcGetpwnam(user, &wb_pwd);
1905 wbcFreeMemory(wb_pwd);
1906 if (!WBC_ERROR_IS_OK(wbc_status)) {
1907 _pam_log(ctx, LOG_DEBUG, "valid_user: wbcGetpwnam gave %s\n",
1908 wbcErrorString(wbc_status));
1909 }
1910
1911 switch (wbc_status) {
1912 case WBC_ERR_UNKNOWN_USER:
1913 return 1;
1914 case WBC_ERR_SUCCESS:
1915 return 0;
1916 default:
1917 break;
1918 }
1919 return -1;
1920 }
1921
1922 static char *_pam_delete(register char *xx)
1923 {
1924 _pam_overwrite(xx);
1925 _pam_drop(xx);
1926 return NULL;
1927 }
1928
1929 /*
1930 * obtain a password from the user
1931 */
1932
1933 static int _winbind_read_password(struct pwb_context *ctx,
1934 unsigned int ctrl,
1935 const char *comment,
1936 const char *prompt1,
1937 const char *prompt2,
1938 const char **pass)
1939 {
1940 int authtok_flag;
1941 int retval;
1942 const char *item;
1943 char *token;
1944
1945 _pam_log(ctx, LOG_DEBUG, "getting password (0x%08x)", ctrl);
1946
1947 /*
1948 * make sure nothing inappropriate gets returned
1949 */
1950
1951 *pass = token = NULL;
1952
1953 /*
1954 * which authentication token are we getting?
1955 */
1956
1957 if (on(WINBIND__OLD_PASSWORD, ctrl)) {
1958 authtok_flag = PAM_OLDAUTHTOK;
1959 } else {
1960 authtok_flag = PAM_AUTHTOK;
1961 }
1962
1963 /*
1964 * should we obtain the password from a PAM item ?
1965 */
1966
1967 if (on(WINBIND_TRY_FIRST_PASS_ARG, ctrl) ||
1968 on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
1969 retval = _pam_get_item(ctx->pamh, authtok_flag, &item);
1970 if (retval != PAM_SUCCESS) {
1971 /* very strange. */
1972 _pam_log(ctx, LOG_ALERT,
1973 "pam_get_item returned error "
1974 "to unix-read-password");
1975 return retval;
1976 } else if (item != NULL) { /* we have a password! */
1977 *pass = item;
1978 item = NULL;
1979 _pam_log(ctx, LOG_DEBUG,
1980 "pam_get_item returned a password");
1981 return PAM_SUCCESS;
1982 } else if (on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
1983 return PAM_AUTHTOK_RECOVER_ERR; /* didn't work */
1984 } else if (on(WINBIND_USE_AUTHTOK_ARG, ctrl)
1985 && off(WINBIND__OLD_PASSWORD, ctrl)) {
1986 return PAM_AUTHTOK_RECOVER_ERR;
1987 }
1988 }
1989 /*
1990 * getting here implies we will have to get the password from the
1991 * user directly.
1992 */
1993
1994 {
1995 struct pam_message msg[3], *pmsg[3];
1996 struct pam_response *resp;
1997 int i, replies;
1998
1999 /* prepare to converse */
2000
2001 if (comment != NULL && off(ctrl, WINBIND_SILENT)) {
2002 pmsg[0] = &msg[0];
2003 msg[0].msg_style = PAM_TEXT_INFO;
2004 msg[0].msg = discard_const_p(char, comment);
2005 i = 1;
2006 } else {
2007 i = 0;
2008 }
2009
2010 pmsg[i] = &msg[i];
2011 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2012 msg[i++].msg = discard_const_p(char, prompt1);
2013 replies = 1;
2014
2015 if (prompt2 != NULL) {
2016 pmsg[i] = &msg[i];
2017 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2018 msg[i++].msg = discard_const_p(char, prompt2);
2019 ++replies;
2020 }
2021 /* so call the conversation expecting i responses */
2022 resp = NULL;
2023 retval = converse(ctx->pamh, i, pmsg, &resp);
2024 if (resp == NULL) {
2025 if (retval == PAM_SUCCESS) {
2026 retval = PAM_AUTHTOK_RECOVER_ERR;
2027 }
2028 goto done;
2029 }
2030 if (retval != PAM_SUCCESS) {
2031 _pam_drop_reply(resp, i);
2032 goto done;
2033 }
2034
2035 /* interpret the response */
2036
2037 token = x_strdup(resp[i - replies].resp);
2038 if (!token) {
2039 _pam_log(ctx, LOG_NOTICE,
2040 "could not recover "
2041 "authentication token");
2042 retval = PAM_AUTHTOK_RECOVER_ERR;
2043 goto done;
2044 }
2045
2046 if (replies == 2) {
2047 /* verify that password entered correctly */
2048 if (!resp[i - 1].resp ||
2049 strcmp(token, resp[i - 1].resp)) {
2050 _pam_delete(token); /* mistyped */
2051 retval = PAM_AUTHTOK_RECOVER_ERR;
2052 _make_remark(ctx, PAM_ERROR_MSG,
2053 MISTYPED_PASS);
2054 }
2055 }
2056
2057 /*
2058 * tidy up the conversation (resp_retcode) is ignored
2059 * -- what is it for anyway? AGM
2060 */
2061 _pam_drop_reply(resp, i);
2062 }
2063
2064 done:
2065 if (retval != PAM_SUCCESS) {
2066 _pam_log_debug(ctx, LOG_DEBUG,
2067 "unable to obtain a password");
2068 return retval;
2069 }
2070 /* 'token' is the entered password */
2071
2072 /* we store this password as an item */
2073
2074 retval = pam_set_item(ctx->pamh, authtok_flag, token);
2075 _pam_delete(token); /* clean it up */
2076 if (retval != PAM_SUCCESS ||
2077 (retval = _pam_get_item(ctx->pamh, authtok_flag, &item)) != PAM_SUCCESS) {
2078
2079 _pam_log(ctx, LOG_CRIT, "error manipulating password");
2080 return retval;
2081
2082 }
2083
2084 *pass = item;
2085 item = NULL; /* break link to password */
2086
2087 return PAM_SUCCESS;
2088 }
2089
2090 static const char *get_conf_item_string(struct pwb_context *ctx,
2091 const char *item,
2092 int config_flag)
2093 {
2094 int i = 0;
2095 const char *parm_opt = NULL;
2096
2097 if (!(ctx->ctrl & config_flag)) {
2098 goto out;
2099 }
2100
2101 /* let the pam opt take precedence over the pam_winbind.conf option */
2102 for (i=0; i<ctx->argc; i++) {
2103
2104 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2105 char *p;
2106
2107 if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2108 _pam_log(ctx, LOG_INFO,
2109 "no \"=\" delimiter for \"%s\" found\n",
2110 item);
2111 goto out;
2112 }
2113 _pam_log_debug(ctx, LOG_INFO,
2114 "PAM config: %s '%s'\n", item, p+1);
2115 return p + 1;
2116 }
2117 }
2118
2119 if (ctx->dict) {
2120 char *key = NULL;
2121
2122 key = talloc_asprintf(ctx, "global:%s", item);
2123 if (!key) {
2124 goto out;
2125 }
2126
2127 parm_opt = iniparser_getstr(ctx->dict, key);
2128 TALLOC_FREE(key);
2129
2130 _pam_log_debug(ctx, LOG_INFO, "CONFIG file: %s '%s'\n",
2131 item, parm_opt);
2132 }
2133 out:
2134 return parm_opt;
2135 }
2136
2137 static int get_config_item_int(struct pwb_context *ctx,
2138 const char *item,
2139 int config_flag)
2140 {
2141 int i, parm_opt = -1;
2142
2143 if (!(ctx->ctrl & config_flag)) {
2144 goto out;
2145 }
2146
2147 /* let the pam opt take precedence over the pam_winbind.conf option */
2148 for (i = 0; i < ctx->argc; i++) {
2149
2150 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2151 char *p;
2152
2153 if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2154 _pam_log(ctx, LOG_INFO,
2155 "no \"=\" delimiter for \"%s\" found\n",
2156 item);
2157 goto out;
2158 }
2159 parm_opt = atoi(p + 1);
2160 _pam_log_debug(ctx, LOG_INFO,
2161 "PAM config: %s '%d'\n",
2162 item, parm_opt);
2163 return parm_opt;
2164 }
2165 }
2166
2167 if (ctx->dict) {
2168 char *key = NULL;
2169
2170 key = talloc_asprintf(ctx, "global:%s", item);
2171 if (!key) {
2172 goto out;
2173 }
2174
2175 parm_opt = iniparser_getint(ctx->dict, key, -1);
2176 TALLOC_FREE(key);
2177
2178 _pam_log_debug(ctx, LOG_INFO,
2179 "CONFIG file: %s '%d'\n",
2180 item, parm_opt);
2181 }
2182 out:
2183 return parm_opt;
2184 }
2185
2186 static const char *get_krb5_cc_type_from_config(struct pwb_context *ctx)
2187 {
2188 return get_conf_item_string(ctx, "krb5_ccache_type",
2189 WINBIND_KRB5_CCACHE_TYPE);
2190 }
2191
2192 static const char *get_member_from_config(struct pwb_context *ctx)
2193 {
2194 const char *ret = NULL;
2195 ret = get_conf_item_string(ctx, "require_membership_of",
2196 WINBIND_REQUIRED_MEMBERSHIP);
2197 if (ret) {
2198 return ret;
2199 }
2200 return get_conf_item_string(ctx, "require-membership-of",
2201 WINBIND_REQUIRED_MEMBERSHIP);
2202 }
2203
2204 static int get_warn_pwd_expire_from_config(struct pwb_context *ctx)
2205 {
2206 int ret;
2207 ret = get_config_item_int(ctx, "warn_pwd_expire",
2208 WINBIND_WARN_PWD_EXPIRE);
2209 /* no or broken setting */
2210 if (ret <= 0) {
2211 return DEFAULT_DAYS_TO_WARN_BEFORE_PWD_EXPIRES;
2212 }
2213 return ret;
2214 }
2215
2216 /**
2217 * Retrieve the winbind separator.
2218 *
2219 * @param ctx PAM winbind context.
2220 *
2221 * @return string separator character. NULL on failure.
2222 */
2223
2224 static char winbind_get_separator(struct pwb_context *ctx)
2225 {
2226 wbcErr wbc_status;
2227 static struct wbcInterfaceDetails *details = NULL;
2228
2229 wbc_status = wbcInterfaceDetails(&details);
2230 if (!WBC_ERROR_IS_OK(wbc_status)) {
2231 _pam_log(ctx, LOG_ERR,
2232 "Could not retrieve winbind interface details: %s",
2233 wbcErrorString(wbc_status));
2234 return '\0';
2235 }
2236
2237 if (!details) {
2238 return '\0';
2239 }
2240
2241 return details->winbind_separator;
2242 }
2243
2244
2245 /**
2246 * Convert a upn to a name.
2247 *
2248 * @param ctx PAM winbind context.
2249 * @param upn USer UPN to be trabslated.
2250 *
2251 * @return converted name. NULL pointer on failure. Caller needs to free.
2252 */
2253
2254 static char* winbind_upn_to_username(struct pwb_context *ctx,
2255 const char *upn)
2256 {
2257 char sep;
2258 wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;
2259 struct wbcDomainSid sid;
2260 enum wbcSidType type;
2261 char *domain;
2262 char *name;
2263
2264 /* This cannot work when the winbind separator = @ */
2265
2266 sep = winbind_get_separator(ctx);
2267 if (!sep || sep == '@') {
2268 return NULL;
2269 }
2270
2271 /* Convert the UPN to a SID */
2272
2273 wbc_status = wbcLookupName("", upn, &sid, &type);
2274 if (!WBC_ERROR_IS_OK(wbc_status)) {
2275 return NULL;
2276 }
2277
2278 /* Convert the the SID back to the sAMAccountName */
2279
2280 wbc_status = wbcLookupSid(&sid, &domain, &name, &type);
2281 if (!WBC_ERROR_IS_OK(wbc_status)) {
2282 return NULL;
2283 }
2284
2285 return talloc_asprintf(ctx, "%s\\%s", domain, name);
2286 }
2287
2288 static int _pam_delete_cred(pam_handle_t *pamh, int flags,
2289 int argc, const char **argv)
2290 {
2291 int retval = PAM_SUCCESS;
2292 struct pwb_context *ctx = NULL;
2293 struct wbcLogoffUserParams logoff;
2294 struct wbcAuthErrorInfo *error = NULL;
2295 const char *user;
2296 wbcErr wbc_status;
2297
2298 retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2299 if (retval) {
2300 goto out;
2301 }
2302
2303 _PAM_LOG_FUNCTION_ENTER("_pam_delete_cred", ctx);
2304
2305 if (ctx->ctrl & WINBIND_KRB5_AUTH) {
2306
2307 /* destroy the ccache here */
2308
2309 uint32_t wbc_flags = 0;
2310 const char *ccname = NULL;
2311 struct passwd *pwd = NULL;
2312
2313 retval = pam_get_user(pamh, &user, "Username: ");
2314 if (retval) {
2315 _pam_log(ctx, LOG_ERR,
2316 "could not identify user");
2317 goto out;
2318 }
2319
2320 if (user == NULL) {
2321 _pam_log(ctx, LOG_ERR,
2322 "username was NULL!");
2323 retval = PAM_USER_UNKNOWN;
2324 goto out;
2325 }
2326
2327 _pam_log_debug(ctx, LOG_DEBUG,
2328 "username [%s] obtained", user);
2329
2330 ccname = pam_getenv(pamh, "KRB5CCNAME");
2331 if (ccname == NULL) {
2332 _pam_log_debug(ctx, LOG_DEBUG,
2333 "user has no KRB5CCNAME environment");
2334 }
2335
2336 pwd = getpwnam(user);
2337 if (pwd == NULL) {
2338 retval = PAM_USER_UNKNOWN;
2339 goto out;
2340 }
2341
2342 wbc_flags = WBFLAG_PAM_KRB5 |
2343 WBFLAG_PAM_CONTACT_TRUSTDOM;
2344
2345 ZERO_STRUCT(logoff);
2346
2347 logoff.username = user;
2348
2349 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2350 &logoff.blobs,
2351 "ccfilename",
2352 0,
2353 (uint8_t *)ccname,
2354 strlen(ccname)+1);
2355 if (!WBC_ERROR_IS_OK(wbc_status)) {
2356 goto out;
2357 }
2358
2359 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2360 &logoff.blobs,
2361 "flags",
2362 0,
2363 (uint8_t *)&wbc_flags,
2364 sizeof(wbc_flags));
2365 if (!WBC_ERROR_IS_OK(wbc_status)) {
2366 goto out;
2367 }
2368
2369 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2370 &logoff.blobs,
2371 "user_uid",
2372 0,
2373 (uint8_t *)&pwd->pw_uid,
2374 sizeof(pwd->pw_uid));
2375 if (!WBC_ERROR_IS_OK(wbc_status)) {
2376 goto out;
2377 }
2378
2379 wbc_status = wbcLogoffUserEx(&logoff, &error);
2380 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2381 user, "wbcLogoffUser");
2382 wbcFreeMemory(error);
2383 wbcFreeMemory(logoff.blobs);
2384
2385 if (!WBC_ERROR_IS_OK(wbc_status)) {
2386 _pam_log(ctx, LOG_INFO,
2387 "failed to logoff user %s: %s\n",
2388 user, wbcErrorString(wbc_status));
2389 }
2390 }
2391
2392 out:
2393 if (logoff.blobs) {
2394 wbcFreeMemory(logoff.blobs);
2395 }
2396
2397 if (!WBC_ERROR_IS_OK(wbc_status)) {
2398 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2399 user, "wbcLogoffUser");
2400 }
2401
2402 /*
2403 * Delete the krb5 ccname variable from the PAM environment
2404 * if it was set by winbind.
2405 */
2406 if (ctx->ctrl & WINBIND_KRB5_AUTH) {
2407 pam_putenv(pamh, "KRB5CCNAME");
2408 }
2409
2410 _PAM_LOG_FUNCTION_LEAVE("_pam_delete_cred", ctx, retval);
2411
2412 TALLOC_FREE(ctx);
2413
2414 return retval;
2415 }
2416
2417 PAM_EXTERN
2418 int pam_sm_authenticate(pam_handle_t *pamh, int flags,
2419 int argc, const char **argv)
2420 {
2421 const char *username;
2422 const char *password;
2423 const char *member = NULL;
2424 const char *cctype = NULL;
2425 int warn_pwd_expire;
2426 int retval = PAM_AUTH_ERR;
2427 char *username_ret = NULL;
2428 char *new_authtok_required = NULL;
2429 char *real_username = NULL;
2430 struct pwb_context *ctx = NULL;
2431
2432 retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2433 if (retval) {
2434 goto out;
2435 }
2436
2437 _PAM_LOG_FUNCTION_ENTER("pam_sm_authenticate", ctx);
2438
2439 /* Get the username */
2440 retval = pam_get_user(pamh, &username, NULL);
2441 if ((retval != PAM_SUCCESS) || (!username)) {
2442 _pam_log_debug(ctx, LOG_DEBUG,
2443 "can not get the username");
2444 retval = PAM_SERVICE_ERR;
2445 goto out;
2446 }
2447
2448
2449 #if defined(AIX)
2450 /* Decode the user name since AIX does not support logn user
2451 names by default. The name is encoded as _#uid. */
2452
2453 if (username[0] == '_') {
2454 uid_t id = atoi(&username[1]);
2455 struct passwd *pw = NULL;
2456
2457 if ((id!=0) && ((pw = getpwuid(id)) != NULL)) {
2458 real_username = strdup(pw->pw_name);
2459 }
2460 }
2461 #endif
2462
2463 if (!real_username) {
2464 /* Just making a copy of the username we got from PAM */
2465 if ((real_username = strdup(username)) == NULL) {
2466 _pam_log_debug(ctx, LOG_DEBUG,
2467 "memory allocation failure when copying "
2468 "username");
2469 retval = PAM_SERVICE_ERR;
2470 goto out;
2471 }
2472 }
2473
2474 /* Maybe this was a UPN */
2475
2476 if (strchr(real_username, '@') != NULL) {
2477 char *samaccountname = NULL;
2478
2479 samaccountname = winbind_upn_to_username(ctx,
2480 real_username);
2481 if (samaccountname) {
2482 free(real_username);
2483 real_username = strdup(samaccountname);
2484 }
2485 }
2486
2487 retval = _winbind_read_password(ctx, ctx->ctrl, NULL,
2488 "Password: ", NULL,
2489 &password);
2490
2491 if (retval != PAM_SUCCESS) {
2492 _pam_log(ctx, LOG_ERR,
2493 "Could not retrieve user's password");
2494 retval = PAM_AUTHTOK_ERR;
2495 goto out;
2496 }
2497
2498 /* Let's not give too much away in the log file */
2499
2500 #ifdef DEBUG_PASSWORD
2501 _pam_log_debug(ctx, LOG_INFO,
2502 "Verify user '%s' with password '%s'",
2503 real_username, password);
2504 #else
2505 _pam_log_debug(ctx, LOG_INFO,
2506 "Verify user '%s'", real_username);
2507 #endif
2508
2509 member = get_member_from_config(ctx);
2510 cctype = get_krb5_cc_type_from_config(ctx);
2511 warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
2512
2513 /* Now use the username to look up password */
2514 retval = winbind_auth_request(ctx, real_username, password,
2515 member, cctype, warn_pwd_expire,
2516 NULL, NULL, NULL,
2517 NULL, &username_ret);
2518
2519 if (retval == PAM_NEW_AUTHTOK_REQD ||
2520 retval == PAM_AUTHTOK_EXPIRED) {
2521
2522 char *new_authtok_required_during_auth = NULL;
2523
2524 new_authtok_required = talloc_asprintf(NULL, "%d", retval);
2525 if (!new_authtok_required) {
2526 retval = PAM_BUF_ERR;
2527 goto out;
2528 }
2529
2530 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2531 new_authtok_required,
2532 _pam_winbind_cleanup_func);
2533
2534 retval = PAM_SUCCESS;
2535
2536 new_authtok_required_during_auth = talloc_asprintf(NULL, "%d", true);
2537 if (!new_authtok_required_during_auth) {
2538 retval = PAM_BUF_ERR;
2539 goto out;
2540 }
2541
2542 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2543 new_authtok_required_during_auth,
2544 _pam_winbind_cleanup_func);
2545
2546 goto out;
2547 }
2548
2549 out:
2550 if (username_ret) {
2551 pam_set_item (pamh, PAM_USER, username_ret);
2552 _pam_log_debug(ctx, LOG_INFO,
2553 "Returned user was '%s'", username_ret);
2554 free(username_ret);
2555 }
2556
2557 if (real_username) {
2558 free(real_username);
2559 }
2560
2561 if (!new_authtok_required) {
2562 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, NULL, NULL);
2563 }
2564
2565 if (retval != PAM_SUCCESS) {
2566 _pam_free_data_info3(pamh);
2567 }
2568
2569 _PAM_LOG_FUNCTION_LEAVE("pam_sm_authenticate", ctx, retval);
2570
2571 TALLOC_FREE(ctx);
2572
2573 return retval;
2574 }
2575
2576 PAM_EXTERN
2577 int pam_sm_setcred(pam_handle_t *pamh, int flags,
2578 int argc, const char **argv)
2579 {
2580 int ret = PAM_SYSTEM_ERR;
2581 struct pwb_context *ctx = NULL;
2582
2583 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2584 if (ret) {
2585 goto out;
2586 }
2587
2588 _PAM_LOG_FUNCTION_ENTER("pam_sm_setcred", ctx);
2589
2590 switch (flags & ~PAM_SILENT) {
2591
2592 case PAM_DELETE_CRED:
2593 ret = _pam_delete_cred(pamh, flags, argc, argv);
2594 break;
2595 case PAM_REFRESH_CRED:
2596 _pam_log_debug(ctx, LOG_WARNING,
2597 "PAM_REFRESH_CRED not implemented");
2598 ret = PAM_SUCCESS;
2599 break;
2600 case PAM_REINITIALIZE_CRED:
2601 _pam_log_debug(ctx, LOG_WARNING,
2602 "PAM_REINITIALIZE_CRED not implemented");
2603 ret = PAM_SUCCESS;
2604 break;
2605 case PAM_ESTABLISH_CRED:
2606 _pam_log_debug(ctx, LOG_WARNING,
2607 "PAM_ESTABLISH_CRED not implemented");
2608 ret = PAM_SUCCESS;
2609 break;
2610 default:
2611 ret = PAM_SYSTEM_ERR;
2612 break;
2613 }
2614
2615 out:
2616
2617 _PAM_LOG_FUNCTION_LEAVE("pam_sm_setcred", ctx, ret);
2618
2619 TALLOC_FREE(ctx);
2620
2621 return ret;
2622 }
2623
2624 /*
2625 * Account management. We want to verify that the account exists
2626 * before returning PAM_SUCCESS
2627 */
2628 PAM_EXTERN
2629 int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
2630 int argc, const char **argv)
2631 {
2632 const char *username;
2633 int ret = PAM_USER_UNKNOWN;
2634 void *tmp = NULL;
2635 struct pwb_context *ctx = NULL;
2636
2637 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2638 if (ret) {
2639 goto out;
2640 }
2641
2642 _PAM_LOG_FUNCTION_ENTER("pam_sm_acct_mgmt", ctx);
2643
2644
2645 /* Get the username */
2646 ret = pam_get_user(pamh, &username, NULL);
2647 if ((ret != PAM_SUCCESS) || (!username)) {
2648 _pam_log_debug(ctx, LOG_DEBUG,
2649 "can not get the username");
2650 ret = PAM_SERVICE_ERR;
2651 goto out;
2652 }
2653
2654 /* Verify the username */
2655 ret = valid_user(ctx, username);
2656 switch (ret) {
2657 case -1:
2658 /* some sort of system error. The log was already printed */
2659 ret = PAM_SERVICE_ERR;
2660 goto out;
2661 case 1:
2662 /* the user does not exist */
2663 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
2664 username);
2665 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
2666 ret = PAM_IGNORE;
2667 goto out;
2668 }
2669 ret = PAM_USER_UNKNOWN;
2670 goto out;
2671 case 0:
2672 pam_get_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2673 (const void **)&tmp);
2674 if (tmp != NULL) {
2675 ret = atoi((const char *)tmp);
2676 switch (ret) {
2677 case PAM_AUTHTOK_EXPIRED:
2678 /* fall through, since new token is required in this case */
2679 case PAM_NEW_AUTHTOK_REQD:
2680 _pam_log(ctx, LOG_WARNING,
2681 "pam_sm_acct_mgmt success but %s is set",
2682 PAM_WINBIND_NEW_AUTHTOK_REQD);
2683 _pam_log(ctx, LOG_NOTICE,
2684 "user '%s' needs new password",
2685 username);
2686 /* PAM_AUTHTOKEN_REQD does not exist, but is documented in the manpage */
2687 ret = PAM_NEW_AUTHTOK_REQD;
2688 goto out;
2689 default:
2690 _pam_log(ctx, LOG_WARNING,
2691 "pam_sm_acct_mgmt success");
2692 _pam_log(ctx, LOG_NOTICE,
2693 "user '%s' granted access", username);
2694 ret = PAM_SUCCESS;
2695 goto out;
2696 }
2697 }
2698
2699 /* Otherwise, the authentication looked good */
2700 _pam_log(ctx, LOG_NOTICE,
2701 "user '%s' granted access", username);
2702 ret = PAM_SUCCESS;
2703 goto out;
2704 default:
2705 /* we don't know anything about this return value */
2706 _pam_log(ctx, LOG_ERR,
2707 "internal module error (ret = %d, user = '%s')",
2708 ret, username);
2709 ret = PAM_SERVICE_ERR;
2710 goto out;
2711 }
2712
2713 /* should not be reached */
2714 ret = PAM_IGNORE;
2715
2716 out:
2717
2718 _PAM_LOG_FUNCTION_LEAVE("pam_sm_acct_mgmt", ctx, ret);
2719
2720 TALLOC_FREE(ctx);
2721
2722 return ret;
2723 }
2724
2725 PAM_EXTERN
2726 int pam_sm_open_session(pam_handle_t *pamh, int flags,
2727 int argc, const char **argv)
2728 {
2729 int ret = PAM_SUCCESS;
2730 struct pwb_context *ctx = NULL;
2731
2732 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2733 if (ret) {
2734 goto out;
2735 }
2736
2737 _PAM_LOG_FUNCTION_ENTER("pam_sm_open_session", ctx);
2738
2739 if (ctx->ctrl & WINBIND_MKHOMEDIR) {
2740 /* check and create homedir */
2741 ret = _pam_mkhomedir(ctx);
2742 }
2743 out:
2744 _PAM_LOG_FUNCTION_LEAVE("pam_sm_open_session", ctx, ret);
2745
2746 TALLOC_FREE(ctx);
2747
2748 return ret;
2749 }
2750
2751 PAM_EXTERN
2752 int pam_sm_close_session(pam_handle_t *pamh, int flags,
2753 int argc, const char **argv)
2754 {
2755 int ret = PAM_SUCCESS;
2756 struct pwb_context *ctx = NULL;
2757
2758 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2759 if (ret) {
2760 goto out;
2761 }
2762
2763 _PAM_LOG_FUNCTION_ENTER("pam_sm_close_session", ctx);
2764
2765 out:
2766 _PAM_LOG_FUNCTION_LEAVE("pam_sm_close_session", ctx, ret);
2767
2768 TALLOC_FREE(ctx);
2769
2770 return ret;
2771 }
2772
2773 /**
2774 * evaluate whether we need to re-authenticate with kerberos after a
2775 * password change
2776 *
2777 * @param ctx PAM winbind context.
2778 * @param user The username
2779 *
2780 * @return boolean Returns true if required, false if not.
2781 */
2782
2783 static bool _pam_require_krb5_auth_after_chauthtok(struct pwb_context *ctx,
2784 const char *user)
2785 {
2786
2787 /* Make sure that we only do this if a) the chauthtok got initiated
2788 * during a logon attempt (authenticate->acct_mgmt->chauthtok) b) any
2789 * later password change via the "passwd" command if done by the user
2790 * itself
2791 * NB. If we login from gdm or xdm and the password expires,
2792 * we change the password, but there is no memory cache.
2793 * Thus, even for passthrough login, we should do the
2794 * authentication again to update memory cache.
2795 * --- BoYang
2796 * */
2797
2798 char *new_authtok_reqd_during_auth = NULL;
2799 struct passwd *pwd = NULL;
2800
2801 _pam_get_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2802 &new_authtok_reqd_during_auth);
2803 pam_set_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2804 NULL, NULL);
2805
2806 if (new_authtok_reqd_during_auth) {
2807 return true;
2808 }
2809
2810 pwd = getpwnam(user);
2811 if (!pwd) {
2812 return false;
2813 }
2814
2815 if (getuid() == pwd->pw_uid) {
2816 return true;
2817 }
2818
2819 return false;
2820 }
2821
2822
2823 PAM_EXTERN
2824 int pam_sm_chauthtok(pam_handle_t * pamh, int flags,
2825 int argc, const char **argv)
2826 {
2827 unsigned int lctrl;
2828 int ret;
2829 bool cached_login = false;
2830
2831 /* <DO NOT free() THESE> */
2832 const char *user;
2833 char *pass_old, *pass_new;
2834 /* </DO NOT free() THESE> */
2835
2836 char *Announce;
2837
2838 int retry = 0;
2839 char *username_ret = NULL;
2840 struct wbcAuthErrorInfo *error = NULL;
2841 struct pwb_context *ctx = NULL;
2842
2843 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2844 if (ret) {
2845 goto out;
2846 }
2847
2848 _PAM_LOG_FUNCTION_ENTER("pam_sm_chauthtok", ctx);
2849
2850 cached_login = (ctx->ctrl & WINBIND_CACHED_LOGIN);
2851
2852 /* clearing offline bit for auth */
2853 ctx->ctrl &= ~WINBIND_CACHED_LOGIN;
2854
2855 /*
2856 * First get the name of a user
2857 */
2858 ret = pam_get_user(pamh, &user, "Username: ");
2859 if (ret) {
2860 _pam_log(ctx, LOG_ERR,
2861 "password - could not identify user");
2862 goto out;
2863 }
2864
2865 if (user == NULL) {
2866 _pam_log(ctx, LOG_ERR, "username was NULL!");
2867 ret = PAM_USER_UNKNOWN;
2868 goto out;
2869 }
2870
2871 _pam_log_debug(ctx, LOG_DEBUG, "username [%s] obtained", user);
2872
2873 /* check if this is really a user in winbindd, not only in NSS */
2874 ret = valid_user(ctx, user);
2875 switch (ret) {
2876 case 1:
2877 ret = PAM_USER_UNKNOWN;
2878 goto out;
2879 case -1:
2880 ret = PAM_SYSTEM_ERR;
2881 goto out;
2882 default:
2883 break;
2884 }
2885
2886 /*
2887 * obtain and verify the current password (OLDAUTHTOK) for
2888 * the user.
2889 */
2890
2891 if (flags & PAM_PRELIM_CHECK) {
2892 time_t pwdlastset_prelim = 0;
2893
2894 /* instruct user what is happening */
2895
2896 #define greeting "Changing password for"
2897 Announce = talloc_asprintf(ctx, "%s %s", greeting, user);
2898 if (!Announce) {
2899 _pam_log(ctx, LOG_CRIT,
2900 "password - out of memory");
2901 ret = PAM_BUF_ERR;
2902 goto out;
2903 }
2904 #undef greeting
2905
2906 lctrl = ctx->ctrl | WINBIND__OLD_PASSWORD;
2907 ret = _winbind_read_password(ctx, lctrl,
2908 Announce,
2909 "(current) NT password: ",
2910 NULL,
2911 (const char **) &pass_old);
2912 TALLOC_FREE(Announce);
2913 if (ret != PAM_SUCCESS) {
2914 _pam_log(ctx, LOG_NOTICE,
2915 "password - (old) token not obtained");
2916 goto out;
2917 }
2918
2919 /* verify that this is the password for this user */
2920
2921 ret = winbind_auth_request(ctx, user, pass_old,
2922 NULL, NULL, 0,
2923 &error, NULL, NULL,
2924 &pwdlastset_prelim, NULL);
2925
2926 if (ret != PAM_ACCT_EXPIRED &&
2927 ret != PAM_AUTHTOK_EXPIRED &&
2928 ret != PAM_NEW_AUTHTOK_REQD &&
2929 ret != PAM_SUCCESS) {
2930 pass_old = NULL;
2931 goto out;
2932 }
2933
2934 pam_set_data(pamh, PAM_WINBIND_PWD_LAST_SET,
2935 (void *)pwdlastset_prelim, NULL);
2936
2937 ret = pam_set_item(pamh, PAM_OLDAUTHTOK,
2938 (const void *) pass_old);
2939 pass_old = NULL;
2940 if (ret != PAM_SUCCESS) {
2941 _pam_log(ctx, LOG_CRIT,
2942 "failed to set PAM_OLDAUTHTOK");
2943 }
2944 } else if (flags & PAM_UPDATE_AUTHTOK) {
2945
2946 time_t pwdlastset_update = 0;
2947
2948 /*
2949 * obtain the proposed password
2950 */
2951
2952 /*
2953 * get the old token back.
2954 */
2955
2956 ret = _pam_get_item(pamh, PAM_OLDAUTHTOK, &pass_old);
2957
2958 if (ret != PAM_SUCCESS) {
2959 _pam_log(ctx, LOG_NOTICE,
2960 "user not authenticated");
2961 goto out;
2962 }
2963
2964 lctrl = ctx->ctrl & ~WINBIND_TRY_FIRST_PASS_ARG;
2965
2966 if (on(WINBIND_USE_AUTHTOK_ARG, lctrl)) {
2967 lctrl |= WINBIND_USE_FIRST_PASS_ARG;
2968 }
2969 retry = 0;
2970 ret = PAM_AUTHTOK_ERR;
2971 while ((ret != PAM_SUCCESS) && (retry++ < MAX_PASSWD_TRIES)) {
2972 /*
2973 * use_authtok is to force the use of a previously entered
2974 * password -- needed for pluggable password strength checking
2975 */
2976
2977 ret = _winbind_read_password(ctx, lctrl,
2978 NULL,
2979 "Enter new NT password: ",
2980 "Retype new NT password: ",
2981 (const char **)&pass_new);
2982
2983 if (ret != PAM_SUCCESS) {
2984 _pam_log_debug(ctx, LOG_ALERT,
2985 "password - "
2986 "new password not obtained");
2987 pass_old = NULL;/* tidy up */
2988 goto out;
2989 }
2990
2991 /*
2992 * At this point we know who the user is and what they
2993 * propose as their new password. Verify that the new
2994 * password is acceptable.
2995 */
2996
2997 if (pass_new[0] == '\0') {/* "\0" password = NULL */
2998 pass_new = NULL;
2999 }
3000 }
3001
3002 /*
3003 * By reaching here we have approved the passwords and must now
3004 * rebuild the password database file.
3005 */
3006 _pam_get_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3007 &pwdlastset_update);
3008
3009 /*
3010 * if cached creds were enabled, make sure to set the
3011 * WINBIND_CACHED_LOGIN bit here in order to have winbindd
3012 * update the cached creds storage - gd
3013 */
3014 if (cached_login) {
3015 ctx->ctrl |= WINBIND_CACHED_LOGIN;
3016 }
3017
3018 ret = winbind_chauthtok_request(ctx, user, pass_old,
3019 pass_new, pwdlastset_update);
3020 if (ret) {
3021 _pam_overwrite(pass_new);
3022 _pam_overwrite(pass_old);
3023 pass_old = pass_new = NULL;
3024 goto out;
3025 }
3026
3027 if (_pam_require_krb5_auth_after_chauthtok(ctx, user)) {
3028
3029 const char *member = NULL;
3030 const char *cctype = NULL;
3031 int warn_pwd_expire;
3032 struct wbcLogonUserInfo *info = NULL;
3033 struct wbcUserPasswordPolicyInfo *policy = NULL;
3034
3035 member = get_member_from_config(ctx);
3036 cctype = get_krb5_cc_type_from_config(ctx);
3037 warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
3038
3039 /* Keep WINBIND_CACHED_LOGIN bit for
3040 * authentication after changing the password.
3041 * This will update the cached credentials in case
3042 * that winbindd_dual_pam_chauthtok() fails
3043 * to update them.
3044 * --- BoYang
3045 * */
3046
3047 ret = winbind_auth_request(ctx, user, pass_new,
3048 member, cctype, 0,
3049 &error, &info, &policy,
3050 NULL, &username_ret);
3051 _pam_overwrite(pass_new);
3052 _pam_overwrite(pass_old);
3053 pass_old = pass_new = NULL;
3054
3055 if (ret == PAM_SUCCESS) {
3056
3057 struct wbcAuthUserInfo *user_info = NULL;
3058
3059 if (info && info->info) {
3060 user_info = info->info;
3061 }
3062
3063 /* warn a user if the password is about to
3064 * expire soon */
3065 _pam_warn_password_expiry(ctx, user_info, policy,
3066 warn_pwd_expire,
3067 NULL);
3068
3069 /* set some info3 info for other modules in the
3070 * stack */
3071 _pam_set_data_info3(ctx, user_info);
3072
3073 /* put krb5ccname into env */
3074 _pam_setup_krb5_env(ctx, info);
3075
3076 if (username_ret) {
3077 pam_set_item(pamh, PAM_USER,
3078 username_ret);
3079 _pam_log_debug(ctx, LOG_INFO,
3080 "Returned user was '%s'",
3081 username_ret);
3082 free(username_ret);
3083 }
3084
3085 wbcFreeMemory(info);
3086 wbcFreeMemory(policy);
3087 }
3088
3089 goto out;
3090 }
3091 } else {
3092 ret = PAM_SERVICE_ERR;
3093 }
3094
3095 out:
3096 {
3097 /* Deal with offline errors. */
3098 int i;
3099 const char *codes[] = {
3100 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
3101 "NT_STATUS_NO_LOGON_SERVERS",
3102 "NT_STATUS_ACCESS_DENIED"
3103 };
3104
3105 for (i=0; i<ARRAY_SIZE(codes); i++) {
3106 int _ret;
3107 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
3108 break;
3109 }
3110 }
3111 }
3112
3113 wbcFreeMemory(error);
3114
3115 _PAM_LOG_FUNCTION_LEAVE("pam_sm_chauthtok", ctx, ret);
3116
3117 TALLOC_FREE(ctx);
3118
3119 return ret;
3120 }
3121
3122 #ifdef PAM_STATIC
3123
3124 /* static module data */
3125
3126 struct pam_module _pam_winbind_modstruct = {
3127 MODULE_NAME,
3128 pam_sm_authenticate,
3129 pam_sm_setcred,
3130 pam_sm_acct_mgmt,
3131 pam_sm_open_session,
3132 pam_sm_close_session,
3133 pam_sm_chauthtok
3134 };
3135
3136 #endif
3137
3138 /*
3139 * Copyright (c) Andrew Tridgell <tridge@samba.org> 2000
3140 * Copyright (c) Tim Potter <tpot@samba.org> 2000
3141 * Copyright (c) Andrew Bartlettt <abartlet@samba.org> 2002
3142 * Copyright (c) Guenther Deschner <gd@samba.org> 2005-2008
3143 * Copyright (c) Jan Rêkorajski 1999.
3144 * Copyright (c) Andrew G. Morgan 1996-8.
3145 * Copyright (c) Alex O. Yuriev, 1996.
3146 * Copyright (c) Cristian Gafton 1996.
3147 * Copyright (C) Elliot Lee <sopwith@redhat.com> 1996, Red Hat Software.
3148 *
3149 * Redistribution and use in source and binary forms, with or without
3150 * modification, are permitted provided that the following conditions
3151 * are met:
3152 * 1. Redistributions of source code must retain the above copyright
3153 * notice, and the entire permission notice in its entirety,
3154 * including the disclaimer of warranties.
3155 * 2. Redistributions in binary form must reproduce the above copyright
3156 * notice, this list of conditions and the following disclaimer in the
3157 * documentation and/or other materials provided with the distribution.
3158 * 3. The name of the author may not be used to endorse or promote
3159 * products derived from this software without specific prior
3160 * written permission.
3161 *
3162 * ALTERNATIVELY, this product may be distributed under the terms of
3163 * the GNU Public License, in which case the provisions of the GPL are
3164 * required INSTEAD OF the above restrictions. (This clause is
3165 * necessary due to a potential bad interaction between the GPL and
3166 * the restrictions contained in a BSD-style copyright.)
3167 *
3168 * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
3169 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
3170 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
3171 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
3172 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
3173 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
3174 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
3175 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
3176 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
3177 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
3178 * OF THE POSSIBILITY OF SUCH DAMAGE.
3179 */
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