source: branches/samba-3.3.x/source/nsswitch/pam_winbind.c

Last change on this file was 411, checked in by Herwig Bauernfeind, 15 years ago

Update Samba 3.3.x to 3.3.11
File size: 78.7 KB
Line 
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
15static 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
51static 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_RECOVER_ERR:
97 return "PAM_AUTHTOK_RECOVER_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#ifdef HAVE_GETTEXT
151static char initialized = 0;
152
153static inline void textdomain_init(void);
154static inline void textdomain_init(void)
155{
156 if (!initialized) {
157 bindtextdomain(MODULE_NAME, dyn_LOCALEDIR);
158 initialized = 1;
159 }
160 return;
161}
162#endif
163
164
165/*
166 * Work around the pam API that has functions with void ** as parameters
167 * These lead to strict aliasing warnings with gcc.
168 */
169static int _pam_get_item(const pam_handle_t *pamh,
170 int item_type,
171 const void *_item)
172{
173 const void **item = (const void **)_item;
174 return pam_get_item(pamh, item_type, item);
175}
176static int _pam_get_data(const pam_handle_t *pamh,
177 const char *module_data_name,
178 const void *_data)
179{
180 const void **data = (const void **)_data;
181 return pam_get_data(pamh, module_data_name, data);
182}
183
184/* some syslogging */
185
186#ifdef HAVE_PAM_VSYSLOG
187static void _pam_log_int(const pam_handle_t *pamh,
188 int err,
189 const char *format,
190 va_list args)
191{
192 pam_vsyslog(pamh, err, format, args);
193}
194#else
195static void _pam_log_int(const pam_handle_t *pamh,
196 int err,
197 const char *format,
198 va_list args)
199{
200 char *format2 = NULL;
201 const char *service;
202
203 _pam_get_item(pamh, PAM_SERVICE, &service);
204
205 format2 = (char *)malloc(strlen(MODULE_NAME)+strlen(format)+strlen(service)+5);
206 if (format2 == NULL) {
207 /* what else todo ? */
208 vsyslog(err, format, args);
209 return;
210 }
211
212 sprintf(format2, "%s(%s): %s", MODULE_NAME, service, format);
213 vsyslog(err, format2, args);
214 SAFE_FREE(format2);
215}
216#endif /* HAVE_PAM_VSYSLOG */
217
218static bool _pam_log_is_silent(int ctrl)
219{
220 return on(ctrl, WINBIND_SILENT);
221}
222
223static void _pam_log(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
224static void _pam_log(struct pwb_context *r, int err, const char *format, ...)
225{
226 va_list args;
227
228 if (_pam_log_is_silent(r->ctrl)) {
229 return;
230 }
231
232 va_start(args, format);
233 _pam_log_int(r->pamh, err, format, args);
234 va_end(args);
235}
236static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
237static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
238{
239 va_list args;
240
241 if (_pam_log_is_silent(ctrl)) {
242 return;
243 }
244
245 va_start(args, format);
246 _pam_log_int(pamh, err, format, args);
247 va_end(args);
248}
249
250static bool _pam_log_is_debug_enabled(int ctrl)
251{
252 if (ctrl == -1) {
253 return false;
254 }
255
256 if (_pam_log_is_silent(ctrl)) {
257 return false;
258 }
259
260 if (!(ctrl & WINBIND_DEBUG_ARG)) {
261 return false;
262 }
263
264 return true;
265}
266
267static bool _pam_log_is_debug_state_enabled(int ctrl)
268{
269 if (!(ctrl & WINBIND_DEBUG_STATE)) {
270 return false;
271 }
272
273 return _pam_log_is_debug_enabled(ctrl);
274}
275
276static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
277static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...)
278{
279 va_list args;
280
281 if (!_pam_log_is_debug_enabled(r->ctrl)) {
282 return;
283 }
284
285 va_start(args, format);
286 _pam_log_int(r->pamh, err, format, args);
287 va_end(args);
288}
289static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
290static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
291{
292 va_list args;
293
294 if (!_pam_log_is_debug_enabled(ctrl)) {
295 return;
296 }
297
298 va_start(args, format);
299 _pam_log_int(pamh, err, format, args);
300 va_end(args);
301}
302
303static void _pam_log_state_datum(struct pwb_context *ctx,
304 int item_type,
305 const char *key,
306 int is_string)
307{
308 const void *data = NULL;
309 if (item_type != 0) {
310 pam_get_item(ctx->pamh, item_type, &data);
311 } else {
312 pam_get_data(ctx->pamh, key, &data);
313 }
314 if (data != NULL) {
315 const char *type = (item_type != 0) ? "ITEM" : "DATA";
316 if (is_string != 0) {
317 _pam_log_debug(ctx, LOG_DEBUG,
318 "[pamh: %p] STATE: %s(%s) = \"%s\" (%p)",
319 ctx->pamh, type, key, (const char *)data,
320 data);
321 } else {
322 _pam_log_debug(ctx, LOG_DEBUG,
323 "[pamh: %p] STATE: %s(%s) = %p",
324 ctx->pamh, type, key, data);
325 }
326 }
327}
328
329#define _PAM_LOG_STATE_DATA_POINTER(ctx, module_data_name) \
330 _pam_log_state_datum(ctx, 0, module_data_name, 0)
331
332#define _PAM_LOG_STATE_DATA_STRING(ctx, module_data_name) \
333 _pam_log_state_datum(ctx, 0, module_data_name, 1)
334
335#define _PAM_LOG_STATE_ITEM_POINTER(ctx, item_type) \
336 _pam_log_state_datum(ctx, item_type, #item_type, 0)
337
338#define _PAM_LOG_STATE_ITEM_STRING(ctx, item_type) \
339 _pam_log_state_datum(ctx, item_type, #item_type, 1)
340
341#ifdef DEBUG_PASSWORD
342#define _LOG_PASSWORD_AS_STRING 1
343#else
344#define _LOG_PASSWORD_AS_STRING 0
345#endif
346
347#define _PAM_LOG_STATE_ITEM_PASSWORD(ctx, item_type) \
348 _pam_log_state_datum(ctx, item_type, #item_type, \
349 _LOG_PASSWORD_AS_STRING)
350
351static void _pam_log_state(struct pwb_context *ctx)
352{
353 if (!_pam_log_is_debug_state_enabled(ctx->ctrl)) {
354 return;
355 }
356
357 _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_SERVICE);
358 _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER);
359 _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_TTY);
360 _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RHOST);
361 _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RUSER);
362 _PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_OLDAUTHTOK);
363 _PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_AUTHTOK);
364 _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER_PROMPT);
365 _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_CONV);
366#ifdef PAM_FAIL_DELAY
367 _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_FAIL_DELAY);
368#endif
369#ifdef PAM_REPOSITORY
370 _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_REPOSITORY);
371#endif
372
373 _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_HOMEDIR);
374 _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSCRIPT);
375 _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSERVER);
376 _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_PROFILEPATH);
377 _PAM_LOG_STATE_DATA_STRING(ctx,
378 PAM_WINBIND_NEW_AUTHTOK_REQD);
379 /* Use atoi to get PAM result code */
380 _PAM_LOG_STATE_DATA_STRING(ctx,
381 PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH);
382 _PAM_LOG_STATE_DATA_POINTER(ctx, PAM_WINBIND_PWD_LAST_SET);
383}
384
385static int _pam_parse(const pam_handle_t *pamh,
386 int flags,
387 int argc,
388 const char **argv,
389 dictionary **result_d)
390{
391 int ctrl = 0;
392 const char *config_file = NULL;
393 int i;
394 const char **v;
395 dictionary *d = NULL;
396
397 if (flags & PAM_SILENT) {
398 ctrl |= WINBIND_SILENT;
399 }
400
401 for (i=argc,v=argv; i-- > 0; ++v) {
402 if (!strncasecmp(*v, "config", strlen("config"))) {
403 ctrl |= WINBIND_CONFIG_FILE;
404 config_file = v[i];
405 break;
406 }
407 }
408
409 if (config_file == NULL) {
410 config_file = PAM_WINBIND_CONFIG_FILE;
411 }
412
413 d = iniparser_load(config_file);
414 if (d == NULL) {
415 goto config_from_pam;
416 }
417
418 if (iniparser_getboolean(d, "global:debug", false)) {
419 ctrl |= WINBIND_DEBUG_ARG;
420 }
421
422 if (iniparser_getboolean(d, "global:debug_state", false)) {
423 ctrl |= WINBIND_DEBUG_STATE;
424 }
425
426 if (iniparser_getboolean(d, "global:cached_login", false)) {
427 ctrl |= WINBIND_CACHED_LOGIN;
428 }
429
430 if (iniparser_getboolean(d, "global:krb5_auth", false)) {
431 ctrl |= WINBIND_KRB5_AUTH;
432 }
433
434 if (iniparser_getboolean(d, "global:silent", false)) {
435 ctrl |= WINBIND_SILENT;
436 }
437
438 if (iniparser_getstr(d, "global:krb5_ccache_type") != NULL) {
439 ctrl |= WINBIND_KRB5_CCACHE_TYPE;
440 }
441
442 if ((iniparser_getstr(d, "global:require-membership-of") != NULL) ||
443 (iniparser_getstr(d, "global:require_membership_of") != NULL)) {
444 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
445 }
446
447 if (iniparser_getboolean(d, "global:try_first_pass", false)) {
448 ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
449 }
450
451 if (iniparser_getint(d, "global:warn_pwd_expire", 0)) {
452 ctrl |= WINBIND_WARN_PWD_EXPIRE;
453 }
454
455 if (iniparser_getboolean(d, "global:mkhomedir", false)) {
456 ctrl |= WINBIND_MKHOMEDIR;
457 }
458
459config_from_pam:
460 /* step through arguments */
461 for (i=argc,v=argv; i-- > 0; ++v) {
462
463 /* generic options */
464 if (!strcmp(*v,"debug"))
465 ctrl |= WINBIND_DEBUG_ARG;
466 else if (!strcasecmp(*v, "debug_state"))
467 ctrl |= WINBIND_DEBUG_STATE;
468 else if (!strcasecmp(*v, "silent"))
469 ctrl |= WINBIND_SILENT;
470 else if (!strcasecmp(*v, "use_authtok"))
471 ctrl |= WINBIND_USE_AUTHTOK_ARG;
472 else if (!strcasecmp(*v, "use_first_pass"))
473 ctrl |= WINBIND_USE_FIRST_PASS_ARG;
474 else if (!strcasecmp(*v, "try_first_pass"))
475 ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
476 else if (!strcasecmp(*v, "unknown_ok"))
477 ctrl |= WINBIND_UNKNOWN_OK_ARG;
478 else if (!strncasecmp(*v, "require_membership_of",
479 strlen("require_membership_of")))
480 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
481 else if (!strncasecmp(*v, "require-membership-of",
482 strlen("require-membership-of")))
483 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
484 else if (!strcasecmp(*v, "krb5_auth"))
485 ctrl |= WINBIND_KRB5_AUTH;
486 else if (!strncasecmp(*v, "krb5_ccache_type",
487 strlen("krb5_ccache_type")))
488 ctrl |= WINBIND_KRB5_CCACHE_TYPE;
489 else if (!strcasecmp(*v, "cached_login"))
490 ctrl |= WINBIND_CACHED_LOGIN;
491 else if (!strcasecmp(*v, "mkhomedir"))
492 ctrl |= WINBIND_MKHOMEDIR;
493 else {
494 __pam_log(pamh, ctrl, LOG_ERR,
495 "pam_parse: unknown option: %s", *v);
496 return -1;
497 }
498
499 }
500
501 if (result_d) {
502 *result_d = d;
503 } else {
504 if (d) {
505 iniparser_freedict(d);
506 }
507 }
508
509 return ctrl;
510};
511
512static int _pam_winbind_free_context(struct pwb_context *ctx)
513{
514 if (!ctx) {
515 return 0;
516 }
517
518 if (ctx->dict) {
519 iniparser_freedict(ctx->dict);
520 }
521
522 return 0;
523}
524
525static int _pam_winbind_init_context(pam_handle_t *pamh,
526 int flags,
527 int argc,
528 const char **argv,
529 struct pwb_context **ctx_p)
530{
531 struct pwb_context *r = NULL;
532
533#ifdef HAVE_GETTEXT
534 textdomain_init();
535#endif
536
537 r = TALLOC_ZERO_P(NULL, struct pwb_context);
538 if (!r) {
539 return PAM_BUF_ERR;
540 }
541
542 talloc_set_destructor(r, _pam_winbind_free_context);
543
544 r->pamh = pamh;
545 r->flags = flags;
546 r->argc = argc;
547 r->argv = argv;
548 r->ctrl = _pam_parse(pamh, flags, argc, argv, &r->dict);
549 if (r->ctrl == -1) {
550 TALLOC_FREE(r);
551 return PAM_SYSTEM_ERR;
552 }
553
554 *ctx_p = r;
555
556 return PAM_SUCCESS;
557}
558
559static void _pam_winbind_cleanup_func(pam_handle_t *pamh,
560 void *data,
561 int error_status)
562{
563 int ctrl = _pam_parse(pamh, 0, 0, NULL, NULL);
564 if (_pam_log_is_debug_state_enabled(ctrl)) {
565 __pam_log_debug(pamh, ctrl, LOG_DEBUG,
566 "[pamh: %p] CLEAN: cleaning up PAM data %p "
567 "(error_status = %d)", pamh, data,
568 error_status);
569 }
570 TALLOC_FREE(data);
571}
572
573
574static const struct ntstatus_errors {
575 const char *ntstatus_string;
576 const char *error_string;
577} ntstatus_errors[] = {
578 {"NT_STATUS_OK",
579 N_("Success")},
580 {"NT_STATUS_BACKUP_CONTROLLER",
581 N_("No primary Domain Controler available")},
582 {"NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
583 N_("No domain controllers found")},
584 {"NT_STATUS_NO_LOGON_SERVERS",
585 N_("No logon servers")},
586 {"NT_STATUS_PWD_TOO_SHORT",
587 N_("Password too short")},
588 {"NT_STATUS_PWD_TOO_RECENT",
589 N_("The password of this user is too recent to change")},
590 {"NT_STATUS_PWD_HISTORY_CONFLICT",
591 N_("Password is already in password history")},
592 {"NT_STATUS_PASSWORD_EXPIRED",
593 N_("Your password has expired")},
594 {"NT_STATUS_PASSWORD_MUST_CHANGE",
595 N_("You need to change your password now")},
596 {"NT_STATUS_INVALID_WORKSTATION",
597 N_("You are not allowed to logon from this workstation")},
598 {"NT_STATUS_INVALID_LOGON_HOURS",
599 N_("You are not allowed to logon at this time")},
600 {"NT_STATUS_ACCOUNT_EXPIRED",
601 N_("Your account has expired. "
602 "Please contact your System administrator")}, /* SCNR */
603 {"NT_STATUS_ACCOUNT_DISABLED",
604 N_("Your account is disabled. "
605 "Please contact your System administrator")}, /* SCNR */
606 {"NT_STATUS_ACCOUNT_LOCKED_OUT",
607 N_("Your account has been locked. "
608 "Please contact your System administrator")}, /* SCNR */
609 {"NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
610 N_("Invalid Trust Account")},
611 {"NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
612 N_("Invalid Trust Account")},
613 {"NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
614 N_("Invalid Trust Account")},
615 {"NT_STATUS_ACCESS_DENIED",
616 N_("Access is denied")},
617 {NULL, NULL}
618};
619
620static const char *_get_ntstatus_error_string(const char *nt_status_string)
621{
622 int i;
623 for (i=0; ntstatus_errors[i].ntstatus_string != NULL; i++) {
624 if (!strcasecmp(ntstatus_errors[i].ntstatus_string,
625 nt_status_string)) {
626 return _(ntstatus_errors[i].error_string);
627 }
628 }
629 return NULL;
630}
631
632/* --- authentication management functions --- */
633
634/* Attempt a conversation */
635
636static int converse(const pam_handle_t *pamh,
637 int nargs,
638 struct pam_message **message,
639 struct pam_response **response)
640{
641 int retval;
642 struct pam_conv *conv;
643
644 retval = _pam_get_item(pamh, PAM_CONV, &conv);
645 if (retval == PAM_SUCCESS) {
646 retval = conv->conv(nargs,
647 (const struct pam_message **)message,
648 response, conv->appdata_ptr);
649 }
650
651 return retval; /* propagate error status */
652}
653
654
655static int _make_remark(struct pwb_context *ctx,
656 int type,
657 const char *text)
658{
659 int retval = PAM_SUCCESS;
660
661 struct pam_message *pmsg[1], msg[1];
662 struct pam_response *resp;
663
664 if (ctx->flags & WINBIND_SILENT) {
665 return PAM_SUCCESS;
666 }
667
668 pmsg[0] = &msg[0];
669 msg[0].msg = discard_const_p(char, text);
670 msg[0].msg_style = type;
671
672 resp = NULL;
673 retval = converse(ctx->pamh, 1, pmsg, &resp);
674
675 if (resp) {
676 _pam_drop_reply(resp, 1);
677 }
678 return retval;
679}
680
681static int _make_remark_v(struct pwb_context *ctx,
682 int type,
683 const char *format,
684 va_list args)
685{
686 char *var;
687 int ret;
688
689 ret = vasprintf(&var, format, args);
690 if (ret < 0) {
691 _pam_log(ctx, LOG_ERR, "memory allocation failure");
692 return ret;
693 }
694
695 ret = _make_remark(ctx, type, var);
696 SAFE_FREE(var);
697 return ret;
698}
699
700static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
701static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...)
702{
703 int ret;
704 va_list args;
705
706 va_start(args, format);
707 ret = _make_remark_v(ctx, type, format, args);
708 va_end(args);
709 return ret;
710}
711
712static int pam_winbind_request_log(struct pwb_context *ctx,
713 int retval,
714 const char *user,
715 const char *fn)
716{
717 switch (retval) {
718 case PAM_AUTH_ERR:
719 /* incorrect password */
720 _pam_log(ctx, LOG_WARNING, "user '%s' denied access "
721 "(incorrect password or invalid membership)", user);
722 return retval;
723 case PAM_ACCT_EXPIRED:
724 /* account expired */
725 _pam_log(ctx, LOG_WARNING, "user '%s' account expired",
726 user);
727 return retval;
728 case PAM_AUTHTOK_EXPIRED:
729 /* password expired */
730 _pam_log(ctx, LOG_WARNING, "user '%s' password expired",
731 user);
732 return retval;
733 case PAM_NEW_AUTHTOK_REQD:
734 /* new password required */
735 _pam_log(ctx, LOG_WARNING, "user '%s' new password "
736 "required", user);
737 return retval;
738 case PAM_USER_UNKNOWN:
739 /* the user does not exist */
740 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
741 user);
742 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
743 return PAM_IGNORE;
744 }
745 return retval;
746 case PAM_SUCCESS:
747 /* Otherwise, the authentication looked good */
748 if (strcmp(fn, "wbcLogonUser") == 0) {
749 _pam_log(ctx, LOG_NOTICE,
750 "user '%s' granted access", user);
751 } else {
752 _pam_log(ctx, LOG_NOTICE,
753 "user '%s' OK", user);
754 }
755 return retval;
756 default:
757 /* we don't know anything about this return value */
758 _pam_log(ctx, LOG_ERR,
759 "internal module error (retval = %s(%d), user = '%s')",
760 _pam_error_code_str(retval), retval, user);
761 return retval;
762 }
763}
764
765static int wbc_auth_error_to_pam_error(struct pwb_context *ctx,
766 struct wbcAuthErrorInfo *e,
767 wbcErr status,
768 const char *username,
769 const char *fn)
770{
771 int ret = PAM_AUTH_ERR;
772
773 if (WBC_ERROR_IS_OK(status)) {
774 _pam_log_debug(ctx, LOG_DEBUG, "request %s succeeded",
775 fn);
776 ret = PAM_SUCCESS;
777 return pam_winbind_request_log(ctx, ret, username, fn);
778 }
779
780 if (e) {
781 if (e->pam_error != PAM_SUCCESS) {
782 _pam_log(ctx, LOG_ERR,
783 "request %s failed: %s, "
784 "PAM error: %s (%d), NTSTATUS: %s, "
785 "Error message was: %s",
786 fn,
787 wbcErrorString(status),
788 _pam_error_code_str(e->pam_error),
789 e->pam_error,
790 e->nt_string,
791 e->display_string);
792 ret = e->pam_error;
793 return pam_winbind_request_log(ctx, ret, username, fn);
794 }
795
796 _pam_log(ctx, LOG_ERR, "request %s failed, but PAM error 0!", fn);
797
798 ret = PAM_SERVICE_ERR;
799 return pam_winbind_request_log(ctx, ret, username, fn);
800 }
801
802 ret = wbc_error_to_pam_error(status);
803 return pam_winbind_request_log(ctx, ret, username, fn);
804}
805
806
807/**
808 * send a password expiry message if required
809 *
810 * @param ctx PAM winbind context.
811 * @param next_change expected (calculated) next expiry date.
812 * @param already_expired pointer to a boolean to indicate if the password is
813 * already expired.
814 *
815 * @return boolean Returns true if message has been sent, false if not.
816 */
817
818static bool _pam_send_password_expiry_message(struct pwb_context *ctx,
819 time_t next_change,
820 time_t now,
821 int warn_pwd_expire,
822 bool *already_expired)
823{
824 int days = 0;
825 struct tm tm_now, tm_next_change;
826
827 if (already_expired) {
828 *already_expired = false;
829 }
830
831 if (next_change <= now) {
832 PAM_WB_REMARK_DIRECT(ctx, "NT_STATUS_PASSWORD_EXPIRED");
833 if (already_expired) {
834 *already_expired = true;
835 }
836 return true;
837 }
838
839 if ((next_change < 0) ||
840 (next_change > now + warn_pwd_expire * SECONDS_PER_DAY)) {
841 return false;
842 }
843
844 if ((localtime_r(&now, &tm_now) == NULL) ||
845 (localtime_r(&next_change, &tm_next_change) == NULL)) {
846 return false;
847 }
848
849 days = (tm_next_change.tm_yday+tm_next_change.tm_year*365) -
850 (tm_now.tm_yday+tm_now.tm_year*365);
851
852 if (days == 0) {
853 _make_remark(ctx, PAM_TEXT_INFO,
854 _("Your password expires today"));
855 return true;
856 }
857
858 if (days > 0 && days < warn_pwd_expire) {
859 _make_remark_format(ctx, PAM_TEXT_INFO,
860 _("Your password will expire in %d %s"),
861 days, (days > 1) ? _("days"):_("day"));
862 return true;
863 }
864
865 return false;
866}
867
868/**
869 * Send a warning if the password expires in the near future
870 *
871 * @param ctx PAM winbind context.
872 * @param response The full authentication response structure.
873 * @param already_expired boolean, is the pwd already expired?
874 *
875 * @return void.
876 */
877
878static void _pam_warn_password_expiry(struct pwb_context *ctx,
879 const struct wbcAuthUserInfo *info,
880 const struct wbcUserPasswordPolicyInfo *policy,
881 int warn_pwd_expire,
882 bool *already_expired)
883{
884 time_t now = time(NULL);
885 time_t next_change = 0;
886
887 if (!info || !policy) {
888 return;
889 }
890
891 if (already_expired) {
892 *already_expired = false;
893 }
894
895 /* accounts with WBC_ACB_PWNOEXP set never receive a warning */
896 if (info->acct_flags & WBC_ACB_PWNOEXP) {
897 return;
898 }
899
900 /* no point in sending a warning if this is a grace logon */
901 if (PAM_WB_GRACE_LOGON(info->user_flags)) {
902 return;
903 }
904
905 /* check if the info3 must change timestamp has been set */
906 next_change = info->pass_must_change_time;
907
908 if (_pam_send_password_expiry_message(ctx, next_change, now,
909 warn_pwd_expire,
910 already_expired)) {
911 return;
912 }
913
914 /* now check for the global password policy */
915 /* good catch from Ralf Haferkamp: an expiry of "never" is translated
916 * to -1 */
917 if ((policy->expire == (int64_t)-1) ||
918 (policy->expire == 0)) {
919 return;
920 }
921
922 next_change = info->pass_last_set_time + policy->expire;
923
924 if (_pam_send_password_expiry_message(ctx, next_change, now,
925 warn_pwd_expire,
926 already_expired)) {
927 return;
928 }
929
930 /* no warning sent */
931}
932
933#define IS_SID_STRING(name) (strncmp("S-", name, 2) == 0)
934
935/**
936 * Append a string, making sure not to overflow and to always return a
937 * NULL-terminated string.
938 *
939 * @param dest Destination string buffer (must already be NULL-terminated).
940 * @param src Source string buffer.
941 * @param dest_buffer_size Size of dest buffer in bytes.
942 *
943 * @return false if dest buffer is not big enough (no bytes copied), true on
944 * success.
945 */
946
947static bool safe_append_string(char *dest,
948 const char *src,
949 int dest_buffer_size)
950{
951 int dest_length = strlen(dest);
952 int src_length = strlen(src);
953
954 if (dest_length + src_length + 1 > dest_buffer_size) {
955 return false;
956 }
957
958 memcpy(dest + dest_length, src, src_length + 1);
959 return true;
960}
961
962/**
963 * Convert a names into a SID string, appending it to a buffer.
964 *
965 * @param ctx PAM winbind context.
966 * @param user User in PAM request.
967 * @param name Name to convert.
968 * @param sid_list_buffer Where to append the string sid.
969 * @param sid_list_buffer Size of sid_list_buffer (in bytes).
970 *
971 * @return false on failure, true on success.
972 */
973static bool winbind_name_to_sid_string(struct pwb_context *ctx,
974 const char *user,
975 const char *name,
976 char *sid_list_buffer,
977 int sid_list_buffer_size)
978{
979 const char* sid_string = NULL;
980 char *sid_str = NULL;
981
982 /* lookup name? */
983 if (IS_SID_STRING(name)) {
984 sid_string = name;
985 } else {
986 wbcErr wbc_status;
987 struct wbcDomainSid sid;
988 enum wbcSidType type;
989
990 _pam_log_debug(ctx, LOG_DEBUG,
991 "no sid given, looking up: %s\n", name);
992
993 wbc_status = wbcLookupName("", name, &sid, &type);
994 if (!WBC_ERROR_IS_OK(wbc_status)) {
995 _pam_log(ctx, LOG_INFO,
996 "could not lookup name: %s\n", name);
997 return false;
998 }
999
1000 wbc_status = wbcSidToString(&sid, &sid_str);
1001 if (!WBC_ERROR_IS_OK(wbc_status)) {
1002 return false;
1003 }
1004
1005 sid_string = sid_str;
1006 }
1007
1008 if (!safe_append_string(sid_list_buffer, sid_string,
1009 sid_list_buffer_size)) {
1010 wbcFreeMemory(sid_str);
1011 return false;
1012 }
1013
1014 wbcFreeMemory(sid_str);
1015 return true;
1016}
1017
1018/**
1019 * Convert a list of names into a list of sids.
1020 *
1021 * @param ctx PAM winbind context.
1022 * @param user User in PAM request.
1023 * @param name_list List of names or string sids, separated by commas.
1024 * @param sid_list_buffer Where to put the list of string sids.
1025 * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1026 *
1027 * @return false on failure, true on success.
1028 */
1029static bool winbind_name_list_to_sid_string_list(struct pwb_context *ctx,
1030 const char *user,
1031 const char *name_list,
1032 char *sid_list_buffer,
1033 int sid_list_buffer_size)
1034{
1035 bool result = false;
1036 char *current_name = NULL;
1037 const char *search_location;
1038 const char *comma;
1039 int len;
1040
1041 if (sid_list_buffer_size > 0) {
1042 sid_list_buffer[0] = 0;
1043 }
1044
1045 search_location = name_list;
1046 while ((comma = strstr(search_location, ",")) != NULL) {
1047 current_name = strndup(search_location,
1048 comma - search_location);
1049 if (NULL == current_name) {
1050 goto out;
1051 }
1052
1053 if (!winbind_name_to_sid_string(ctx, user,
1054 current_name,
1055 sid_list_buffer,
1056 sid_list_buffer_size)) {
1057 /*
1058 * If one group name failed, we must not fail
1059 * the authentication totally, continue with
1060 * the following group names. If user belongs to
1061 * one of the valid groups, we must allow it
1062 * login. -- BoYang
1063 */
1064
1065 _pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
1066 "check if group %s is valid group.", current_name,
1067 current_name);
1068 _make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
1069 "to sid, please contact your administrator to see "
1070 "if group %s is valid."), current_name, current_name);
1071 SAFE_FREE(current_name);
1072 search_location = comma + 1;
1073 continue;
1074 }
1075
1076 SAFE_FREE(current_name);
1077
1078 if (!safe_append_string(sid_list_buffer, ",",
1079 sid_list_buffer_size)) {
1080 goto out;
1081 }
1082
1083 search_location = comma + 1;
1084 }
1085
1086 if (!winbind_name_to_sid_string(ctx, user, search_location,
1087 sid_list_buffer,
1088 sid_list_buffer_size)) {
1089 _pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
1090 "check if group %s is valid group.", search_location,
1091 search_location);
1092 _make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
1093 "to sid, please contact your administrator to see "
1094 "if group %s is valid."), search_location, search_location);
1095 /*
1096 * The lookup of the last name failed..
1097 * It results in require_member_of_sid ends with ','
1098 * It is malformated parameter here, overwrite the last ','.
1099 */
1100 len = strlen(sid_list_buffer);
1101 if (len) {
1102 if (sid_list_buffer[len - 1] == ',') {
1103 sid_list_buffer[len - 1] = '\0';
1104 }
1105 }
1106 }
1107
1108 result = true;
1109
1110out:
1111 SAFE_FREE(current_name);
1112 return result;
1113}
1114
1115/**
1116 * put krb5ccname variable into environment
1117 *
1118 * @param ctx PAM winbind context.
1119 * @param krb5ccname env variable retrieved from winbindd.
1120 *
1121 * @return void.
1122 */
1123
1124static void _pam_setup_krb5_env(struct pwb_context *ctx,
1125 struct wbcLogonUserInfo *info)
1126{
1127 char var[PATH_MAX];
1128 int ret;
1129 uint32_t i;
1130 const char *krb5ccname = NULL;
1131
1132 if (off(ctx->ctrl, WINBIND_KRB5_AUTH)) {
1133 return;
1134 }
1135
1136 if (!info) {
1137 return;
1138 }
1139
1140 for (i=0; i < info->num_blobs; i++) {
1141 if (strcasecmp(info->blobs[i].name, "krb5ccname") == 0) {
1142 krb5ccname = (const char *)info->blobs[i].blob.data;
1143 break;
1144 }
1145 }
1146
1147 if (!krb5ccname || (strlen(krb5ccname) == 0)) {
1148 return;
1149 }
1150
1151 _pam_log_debug(ctx, LOG_DEBUG,
1152 "request returned KRB5CCNAME: %s", krb5ccname);
1153
1154 if (snprintf(var, sizeof(var), "KRB5CCNAME=%s", krb5ccname) == -1) {
1155 return;
1156 }
1157
1158 ret = pam_putenv(ctx->pamh, var);
1159 if (ret) {
1160 _pam_log(ctx, LOG_ERR,
1161 "failed to set KRB5CCNAME to %s: %s",
1162 var, pam_strerror(ctx->pamh, ret));
1163 }
1164}
1165
1166/**
1167 * Copy unix username if available (further processed in PAM).
1168 *
1169 * @param ctx PAM winbind context
1170 * @param user_ret A pointer that holds a pointer to a string
1171 * @param unix_username A username
1172 *
1173 * @return void.
1174 */
1175
1176static void _pam_setup_unix_username(struct pwb_context *ctx,
1177 char **user_ret,
1178 struct wbcLogonUserInfo *info)
1179{
1180 const char *unix_username = NULL;
1181 uint32_t i;
1182
1183 if (!user_ret || !info) {
1184 return;
1185 }
1186
1187 for (i=0; i < info->num_blobs; i++) {
1188 if (strcasecmp(info->blobs[i].name, "unix_username") == 0) {
1189 unix_username = (const char *)info->blobs[i].blob.data;
1190 break;
1191 }
1192 }
1193
1194 if (!unix_username || !unix_username[0]) {
1195 return;
1196 }
1197
1198 *user_ret = strdup(unix_username);
1199}
1200
1201/**
1202 * Set string into the PAM stack.
1203 *
1204 * @param ctx PAM winbind context.
1205 * @param data_name Key name for pam_set_data.
1206 * @param value String value.
1207 *
1208 * @return void.
1209 */
1210
1211static void _pam_set_data_string(struct pwb_context *ctx,
1212 const char *data_name,
1213 const char *value)
1214{
1215 int ret;
1216
1217 if (!data_name || !value || (strlen(data_name) == 0) ||
1218 (strlen(value) == 0)) {
1219 return;
1220 }
1221
1222 ret = pam_set_data(ctx->pamh, data_name, talloc_strdup(NULL, value),
1223 _pam_winbind_cleanup_func);
1224 if (ret) {
1225 _pam_log_debug(ctx, LOG_DEBUG,
1226 "Could not set data %s: %s\n",
1227 data_name, pam_strerror(ctx->pamh, ret));
1228 }
1229}
1230
1231/**
1232 * Set info3 strings into the PAM stack.
1233 *
1234 * @param ctx PAM winbind context.
1235 * @param data_name Key name for pam_set_data.
1236 * @param value String value.
1237 *
1238 * @return void.
1239 */
1240
1241static void _pam_set_data_info3(struct pwb_context *ctx,
1242 const struct wbcAuthUserInfo *info)
1243{
1244 _pam_set_data_string(ctx, PAM_WINBIND_HOMEDIR,
1245 info->home_directory);
1246 _pam_set_data_string(ctx, PAM_WINBIND_LOGONSCRIPT,
1247 info->logon_script);
1248 _pam_set_data_string(ctx, PAM_WINBIND_LOGONSERVER,
1249 info->logon_server);
1250 _pam_set_data_string(ctx, PAM_WINBIND_PROFILEPATH,
1251 info->profile_path);
1252}
1253
1254/**
1255 * Free info3 strings in the PAM stack.
1256 *
1257 * @param pamh PAM handle
1258 *
1259 * @return void.
1260 */
1261
1262static void _pam_free_data_info3(pam_handle_t *pamh)
1263{
1264 pam_set_data(pamh, PAM_WINBIND_HOMEDIR, NULL, NULL);
1265 pam_set_data(pamh, PAM_WINBIND_LOGONSCRIPT, NULL, NULL);
1266 pam_set_data(pamh, PAM_WINBIND_LOGONSERVER, NULL, NULL);
1267 pam_set_data(pamh, PAM_WINBIND_PROFILEPATH, NULL, NULL);
1268}
1269
1270/**
1271 * Send PAM_ERROR_MSG for cached or grace logons.
1272 *
1273 * @param ctx PAM winbind context.
1274 * @param username User in PAM request.
1275 * @param info3_user_flgs Info3 flags containing logon type bits.
1276 *
1277 * @return void.
1278 */
1279
1280static void _pam_warn_logon_type(struct pwb_context *ctx,
1281 const char *username,
1282 uint32_t info3_user_flgs)
1283{
1284 /* inform about logon type */
1285 if (PAM_WB_GRACE_LOGON(info3_user_flgs)) {
1286
1287 _make_remark(ctx, PAM_ERROR_MSG,
1288 _("Grace login. "
1289 "Please change your password as soon you're "
1290 "online again"));
1291 _pam_log_debug(ctx, LOG_DEBUG,
1292 "User %s logged on using grace logon\n",
1293 username);
1294
1295 } else if (PAM_WB_CACHED_LOGON(info3_user_flgs)) {
1296
1297 _make_remark(ctx, PAM_ERROR_MSG,
1298 _("Domain Controller unreachable, "
1299 "using cached credentials instead. "
1300 "Network resources may be unavailable"));
1301 _pam_log_debug(ctx, LOG_DEBUG,
1302 "User %s logged on using cached credentials\n",
1303 username);
1304 }
1305}
1306
1307/**
1308 * Send PAM_ERROR_MSG for krb5 errors.
1309 *
1310 * @param ctx PAM winbind context.
1311 * @param username User in PAM request.
1312 * @param info3_user_flgs Info3 flags containing logon type bits.
1313 *
1314 * @return void.
1315 */
1316
1317static void _pam_warn_krb5_failure(struct pwb_context *ctx,
1318 const char *username,
1319 uint32_t info3_user_flgs)
1320{
1321 if (PAM_WB_KRB5_CLOCK_SKEW(info3_user_flgs)) {
1322 _make_remark(ctx, PAM_ERROR_MSG,
1323 _("Failed to establish your Kerberos Ticket cache "
1324 "due time differences\n"
1325 "with the domain controller. "
1326 "Please verify the system time.\n"));
1327 _pam_log_debug(ctx, LOG_DEBUG,
1328 "User %s: Clock skew when getting Krb5 TGT\n",
1329 username);
1330 }
1331}
1332
1333static bool _pam_check_remark_auth_err(struct pwb_context *ctx,
1334 const struct wbcAuthErrorInfo *e,
1335 const char *nt_status_string,
1336 int *pam_error)
1337{
1338 const char *ntstatus = NULL;
1339 const char *error_string = NULL;
1340
1341 if (!e || !pam_error) {
1342 return false;
1343 }
1344
1345 ntstatus = e->nt_string;
1346 if (!ntstatus) {
1347 return false;
1348 }
1349
1350 if (strcasecmp(ntstatus, nt_status_string) == 0) {
1351
1352 error_string = _get_ntstatus_error_string(nt_status_string);
1353 if (error_string) {
1354 _make_remark(ctx, PAM_ERROR_MSG, error_string);
1355 *pam_error = e->pam_error;
1356 return true;
1357 }
1358
1359 if (e->display_string) {
1360 _make_remark(ctx, PAM_ERROR_MSG, e->display_string);
1361 *pam_error = e->pam_error;
1362 return true;
1363 }
1364
1365 _make_remark(ctx, PAM_ERROR_MSG, nt_status_string);
1366 *pam_error = e->pam_error;
1367
1368 return true;
1369 }
1370
1371 return false;
1372};
1373
1374/**
1375 * Compose Password Restriction String for a PAM_ERROR_MSG conversation.
1376 *
1377 * @param i The wbcUserPasswordPolicyInfo struct.
1378 *
1379 * @return string (caller needs to talloc_free).
1380 */
1381
1382static char *_pam_compose_pwd_restriction_string(struct pwb_context *ctx,
1383 struct wbcUserPasswordPolicyInfo *i)
1384{
1385 char *str = NULL;
1386
1387 if (!i) {
1388 goto failed;
1389 }
1390
1391 str = talloc_asprintf(ctx, _("Your password "));
1392 if (!str) {
1393 goto failed;
1394 }
1395
1396 if (i->min_length_password > 0) {
1397 str = talloc_asprintf_append(str,
1398 _("must be at least %d characters; "),
1399 i->min_length_password);
1400 if (!str) {
1401 goto failed;
1402 }
1403 }
1404
1405 if (i->password_history > 0) {
1406 str = talloc_asprintf_append(str,
1407 _("cannot repeat any of your previous %d "
1408 "passwords; "),
1409 i->password_history);
1410 if (!str) {
1411 goto failed;
1412 }
1413 }
1414
1415 if (i->password_properties & WBC_DOMAIN_PASSWORD_COMPLEX) {
1416 str = talloc_asprintf_append(str,
1417 _("must contain capitals, numerals "
1418 "or punctuation; "
1419 "and cannot contain your account "
1420 "or full name; "));
1421 if (!str) {
1422 goto failed;
1423 }
1424 }
1425
1426 str = talloc_asprintf_append(str,
1427 _("Please type a different password. "
1428 "Type a password which meets these requirements in "
1429 "both text boxes."));
1430 if (!str) {
1431 goto failed;
1432 }
1433
1434 return str;
1435
1436 failed:
1437 TALLOC_FREE(str);
1438 return NULL;
1439}
1440
1441static int _pam_create_homedir(struct pwb_context *ctx,
1442 const char *dirname,
1443 mode_t mode)
1444{
1445 struct stat sbuf;
1446
1447 if (stat(dirname, &sbuf) == 0) {
1448 return PAM_SUCCESS;
1449 }
1450
1451 if (mkdir(dirname, mode) != 0) {
1452
1453 _make_remark_format(ctx, PAM_TEXT_INFO,
1454 _("Creating directory: %s failed: %s"),
1455 dirname, strerror(errno));
1456 _pam_log(ctx, LOG_ERR, "could not create dir: %s (%s)",
1457 dirname, strerror(errno));
1458 return PAM_PERM_DENIED;
1459 }
1460
1461 return PAM_SUCCESS;
1462}
1463
1464static int _pam_chown_homedir(struct pwb_context *ctx,
1465 const char *dirname,
1466 uid_t uid,
1467 gid_t gid)
1468{
1469 if (chown(dirname, uid, gid) != 0) {
1470 _pam_log(ctx, LOG_ERR, "failed to chown user homedir: %s (%s)",
1471 dirname, strerror(errno));
1472 return PAM_PERM_DENIED;
1473 }
1474
1475 return PAM_SUCCESS;
1476}
1477
1478static int _pam_mkhomedir(struct pwb_context *ctx)
1479{
1480 struct passwd *pwd = NULL;
1481 char *token = NULL;
1482 char *create_dir = NULL;
1483 char *user_dir = NULL;
1484 int ret;
1485 const char *username;
1486 mode_t mode = 0700;
1487 char *safe_ptr = NULL;
1488 char *p = NULL;
1489
1490 /* Get the username */
1491 ret = pam_get_user(ctx->pamh, &username, NULL);
1492 if ((ret != PAM_SUCCESS) || (!username)) {
1493 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1494 return PAM_SERVICE_ERR;
1495 }
1496
1497 pwd = getpwnam(username);
1498 if (pwd == NULL) {
1499 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1500 return PAM_USER_UNKNOWN;
1501 }
1502 _pam_log_debug(ctx, LOG_DEBUG, "homedir is: %s", pwd->pw_dir);
1503
1504 ret = _pam_create_homedir(ctx, pwd->pw_dir, 0700);
1505 if (ret == PAM_SUCCESS) {
1506 ret = _pam_chown_homedir(ctx, pwd->pw_dir,
1507 pwd->pw_uid,
1508 pwd->pw_gid);
1509 }
1510
1511 if (ret == PAM_SUCCESS) {
1512 return ret;
1513 }
1514
1515 /* maybe we need to create parent dirs */
1516 create_dir = talloc_strdup(ctx, "/");
1517 if (!create_dir) {
1518 return PAM_BUF_ERR;
1519 }
1520
1521 /* find final directory */
1522 user_dir = strrchr(pwd->pw_dir, '/');
1523 if (!user_dir) {
1524 return PAM_BUF_ERR;
1525 }
1526 user_dir++;
1527
1528 _pam_log(ctx, LOG_DEBUG, "final directory: %s", user_dir);
1529
1530 p = pwd->pw_dir;
1531
1532 while ((token = strtok_r(p, "/", &safe_ptr)) != NULL) {
1533
1534 mode = 0755;
1535
1536 p = NULL;
1537
1538 _pam_log_debug(ctx, LOG_DEBUG, "token is %s", token);
1539
1540 create_dir = talloc_asprintf_append(create_dir, "%s/", token);
1541 if (!create_dir) {
1542 return PAM_BUF_ERR;
1543 }
1544 _pam_log_debug(ctx, LOG_DEBUG, "current_dir is %s", create_dir);
1545
1546 if (strcmp(token, user_dir) == 0) {
1547 _pam_log_debug(ctx, LOG_DEBUG, "assuming last directory: %s", token);
1548 mode = 0700;
1549 }
1550
1551 ret = _pam_create_homedir(ctx, create_dir, mode);
1552 if (ret) {
1553 return ret;
1554 }
1555 }
1556
1557 return _pam_chown_homedir(ctx, create_dir,
1558 pwd->pw_uid,
1559 pwd->pw_gid);
1560}
1561
1562/* talk to winbindd */
1563static int winbind_auth_request(struct pwb_context *ctx,
1564 const char *user,
1565 const char *pass,
1566 const char *member,
1567 const char *cctype,
1568 const int warn_pwd_expire,
1569 struct wbcAuthErrorInfo **p_error,
1570 struct wbcLogonUserInfo **p_info,
1571 struct wbcUserPasswordPolicyInfo **p_policy,
1572 time_t *pwd_last_set,
1573 char **user_ret)
1574{
1575 wbcErr wbc_status;
1576
1577 struct wbcLogonUserParams logon;
1578 char membership_of[1024];
1579 uid_t user_uid = -1;
1580 uint32_t flags = WBFLAG_PAM_INFO3_TEXT |
1581 WBFLAG_PAM_GET_PWD_POLICY;
1582
1583 struct wbcLogonUserInfo *info = NULL;
1584 struct wbcAuthUserInfo *user_info = NULL;
1585 struct wbcAuthErrorInfo *error = NULL;
1586 struct wbcUserPasswordPolicyInfo *policy = NULL;
1587
1588 int ret = PAM_AUTH_ERR;
1589 int i;
1590 const char *codes[] = {
1591 "NT_STATUS_PASSWORD_EXPIRED",
1592 "NT_STATUS_PASSWORD_MUST_CHANGE",
1593 "NT_STATUS_INVALID_WORKSTATION",
1594 "NT_STATUS_INVALID_LOGON_HOURS",
1595 "NT_STATUS_ACCOUNT_EXPIRED",
1596 "NT_STATUS_ACCOUNT_DISABLED",
1597 "NT_STATUS_ACCOUNT_LOCKED_OUT",
1598 "NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
1599 "NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
1600 "NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
1601 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1602 "NT_STATUS_NO_LOGON_SERVERS",
1603 "NT_STATUS_WRONG_PASSWORD",
1604 "NT_STATUS_ACCESS_DENIED"
1605 };
1606
1607 if (pwd_last_set) {
1608 *pwd_last_set = 0;
1609 }
1610
1611 /* Krb5 auth always has to go against the KDC of the user's realm */
1612
1613 if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1614 flags |= WBFLAG_PAM_CONTACT_TRUSTDOM;
1615 }
1616
1617 if (ctx->ctrl & (WINBIND_KRB5_AUTH|WINBIND_CACHED_LOGIN)) {
1618 struct passwd *pwd = NULL;
1619
1620 pwd = getpwnam(user);
1621 if (pwd == NULL) {
1622 return PAM_USER_UNKNOWN;
1623 }
1624 user_uid = pwd->pw_uid;
1625 }
1626
1627 if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1628
1629 _pam_log_debug(ctx, LOG_DEBUG,
1630 "enabling krb5 login flag\n");
1631
1632 flags |= WBFLAG_PAM_KRB5 |
1633 WBFLAG_PAM_FALLBACK_AFTER_KRB5;
1634 }
1635
1636 if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1637 _pam_log_debug(ctx, LOG_DEBUG,
1638 "enabling cached login flag\n");
1639 flags |= WBFLAG_PAM_CACHED_LOGIN;
1640 }
1641
1642 if (user_ret) {
1643 *user_ret = NULL;
1644 flags |= WBFLAG_PAM_UNIX_NAME;
1645 }
1646
1647 if (cctype != NULL) {
1648 _pam_log_debug(ctx, LOG_DEBUG,
1649 "enabling request for a %s krb5 ccache\n",
1650 cctype);
1651 }
1652
1653 if (member != NULL) {
1654
1655 ZERO_STRUCT(membership_of);
1656
1657 if (!winbind_name_list_to_sid_string_list(ctx, user, member,
1658 membership_of,
1659 sizeof(membership_of))) {
1660 _pam_log_debug(ctx, LOG_ERR,
1661 "failed to serialize membership of sid "
1662 "\"%s\"\n", member);
1663 return PAM_AUTH_ERR;
1664 }
1665 }
1666
1667 ZERO_STRUCT(logon);
1668
1669 logon.username = user;
1670 logon.password = pass;
1671
1672 if (cctype) {
1673 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1674 &logon.blobs,
1675 "krb5_cc_type",
1676 0,
1677 (uint8_t *)cctype,
1678 strlen(cctype)+1);
1679 if (!WBC_ERROR_IS_OK(wbc_status)) {
1680 goto done;
1681 }
1682 }
1683
1684 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1685 &logon.blobs,
1686 "flags",
1687 0,
1688 (uint8_t *)&flags,
1689 sizeof(flags));
1690 if (!WBC_ERROR_IS_OK(wbc_status)) {
1691 goto done;
1692 }
1693
1694 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1695 &logon.blobs,
1696 "user_uid",
1697 0,
1698 (uint8_t *)&user_uid,
1699 sizeof(user_uid));
1700 if (!WBC_ERROR_IS_OK(wbc_status)) {
1701 goto done;
1702 }
1703
1704 if (member) {
1705 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1706 &logon.blobs,
1707 "membership_of",
1708 0,
1709 (uint8_t *)membership_of,
1710 sizeof(membership_of));
1711 if (!WBC_ERROR_IS_OK(wbc_status)) {
1712 goto done;
1713 }
1714 }
1715
1716 wbc_status = wbcLogonUser(&logon, &info, &error, &policy);
1717 ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1718 user, "wbcLogonUser");
1719 wbcFreeMemory(logon.blobs);
1720 logon.blobs = NULL;
1721
1722 if (info && info->info) {
1723 user_info = info->info;
1724 }
1725
1726 if (pwd_last_set && user_info) {
1727 *pwd_last_set = user_info->pass_last_set_time;
1728 }
1729
1730 if (p_info && info) {
1731 *p_info = info;
1732 }
1733
1734 if (p_policy && policy) {
1735 *p_policy = policy;
1736 }
1737
1738 if (p_error && error) {
1739 /* We want to process the error in the caller. */
1740 *p_error = error;
1741 return ret;
1742 }
1743
1744 for (i=0; i<ARRAY_SIZE(codes); i++) {
1745 int _ret = ret;
1746 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1747 ret = _ret;
1748 goto done;
1749 }
1750 }
1751
1752 if ((ret == PAM_SUCCESS) && user_info && policy && info) {
1753
1754 bool already_expired = false;
1755
1756 /* warn a user if the password is about to expire soon */
1757 _pam_warn_password_expiry(ctx, user_info, policy,
1758 warn_pwd_expire,
1759 &already_expired);
1760
1761 if (already_expired == true) {
1762
1763 SMB_TIME_T last_set = user_info->pass_last_set_time;
1764
1765 _pam_log_debug(ctx, LOG_DEBUG,
1766 "Password has expired "
1767 "(Password was last set: %lld, "
1768 "the policy says it should expire here "
1769 "%lld (now it's: %lu))\n",
1770 (long long int)last_set,
1771 (long long int)last_set +
1772 policy->expire,
1773 time(NULL));
1774
1775 return PAM_AUTHTOK_EXPIRED;
1776 }
1777
1778 /* inform about logon type */
1779 _pam_warn_logon_type(ctx, user, user_info->user_flags);
1780
1781 /* inform about krb5 failures */
1782 _pam_warn_krb5_failure(ctx, user, user_info->user_flags);
1783
1784 /* set some info3 info for other modules in the stack */
1785 _pam_set_data_info3(ctx, user_info);
1786
1787 /* put krb5ccname into env */
1788 _pam_setup_krb5_env(ctx, info);
1789
1790 /* If winbindd returned a username, return the pointer to it
1791 * here. */
1792 _pam_setup_unix_username(ctx, user_ret, info);
1793 }
1794
1795 done:
1796 if (logon.blobs) {
1797 wbcFreeMemory(logon.blobs);
1798 }
1799 if (info && info->blobs && !p_info) {
1800 wbcFreeMemory(info->blobs);
1801 }
1802 if (error && !p_error) {
1803 wbcFreeMemory(error);
1804 }
1805 if (info && !p_info) {
1806 wbcFreeMemory(info);
1807 }
1808 if (policy && !p_policy) {
1809 wbcFreeMemory(policy);
1810 }
1811
1812 return ret;
1813}
1814
1815/* talk to winbindd */
1816static int winbind_chauthtok_request(struct pwb_context *ctx,
1817 const char *user,
1818 const char *oldpass,
1819 const char *newpass,
1820 time_t pwd_last_set)
1821{
1822 wbcErr wbc_status;
1823 struct wbcChangePasswordParams params;
1824 struct wbcAuthErrorInfo *error = NULL;
1825 struct wbcUserPasswordPolicyInfo *policy = NULL;
1826 enum wbcPasswordChangeRejectReason reject_reason = -1;
1827 uint32_t flags = 0;
1828
1829 int i;
1830 const char *codes[] = {
1831 "NT_STATUS_BACKUP_CONTROLLER",
1832 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1833 "NT_STATUS_NO_LOGON_SERVERS",
1834 "NT_STATUS_ACCESS_DENIED",
1835 "NT_STATUS_PWD_TOO_SHORT", /* TODO: tell the min pwd length ? */
1836 "NT_STATUS_PWD_TOO_RECENT", /* TODO: tell the minage ? */
1837 "NT_STATUS_PWD_HISTORY_CONFLICT" /* TODO: tell the history length ? */
1838 };
1839 int ret = PAM_AUTH_ERR;
1840
1841 ZERO_STRUCT(params);
1842
1843 if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1844 flags |= WBFLAG_PAM_KRB5 |
1845 WBFLAG_PAM_CONTACT_TRUSTDOM;
1846 }
1847
1848 if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1849 flags |= WBFLAG_PAM_CACHED_LOGIN;
1850 }
1851
1852 params.account_name = user;
1853 params.level = WBC_AUTH_USER_LEVEL_PLAIN;
1854 params.old_password.plaintext = oldpass;
1855 params.new_password.plaintext = newpass;
1856 params.flags = flags;
1857
1858 wbc_status = wbcChangeUserPasswordEx(&params, &error, &reject_reason, &policy);
1859 ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1860 user, "wbcChangeUserPasswordEx");
1861
1862 if (WBC_ERROR_IS_OK(wbc_status)) {
1863 _pam_log(ctx, LOG_NOTICE,
1864 "user '%s' password changed", user);
1865 return PAM_SUCCESS;
1866 }
1867
1868 if (!error) {
1869 wbcFreeMemory(policy);
1870 return ret;
1871 }
1872
1873 for (i=0; i<ARRAY_SIZE(codes); i++) {
1874 int _ret = ret;
1875 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1876 ret = _ret;
1877 goto done;
1878 }
1879 }
1880
1881 if (!strcasecmp(error->nt_string,
1882 "NT_STATUS_PASSWORD_RESTRICTION")) {
1883
1884 char *pwd_restriction_string = NULL;
1885 SMB_TIME_T min_pwd_age = 0;
1886
1887 if (policy) {
1888 min_pwd_age = policy->min_passwordage;
1889 }
1890
1891 /* FIXME: avoid to send multiple PAM messages after another */
1892 switch (reject_reason) {
1893 case -1:
1894 break;
1895 case WBC_PWD_CHANGE_REJECT_OTHER:
1896 if ((min_pwd_age > 0) &&
1897 (pwd_last_set + min_pwd_age > time(NULL))) {
1898 PAM_WB_REMARK_DIRECT(ctx,
1899 "NT_STATUS_PWD_TOO_RECENT");
1900 }
1901 break;
1902 case WBC_PWD_CHANGE_REJECT_TOO_SHORT:
1903 PAM_WB_REMARK_DIRECT(ctx,
1904 "NT_STATUS_PWD_TOO_SHORT");
1905 break;
1906 case WBC_PWD_CHANGE_REJECT_IN_HISTORY:
1907 PAM_WB_REMARK_DIRECT(ctx,
1908 "NT_STATUS_PWD_HISTORY_CONFLICT");
1909 break;
1910 case WBC_PWD_CHANGE_REJECT_COMPLEXITY:
1911 _make_remark(ctx, PAM_ERROR_MSG,
1912 _("Password does not meet "
1913 "complexity requirements"));
1914 break;
1915 default:
1916 _pam_log_debug(ctx, LOG_DEBUG,
1917 "unknown password change "
1918 "reject reason: %d",
1919 reject_reason);
1920 break;
1921 }
1922
1923 pwd_restriction_string =
1924 _pam_compose_pwd_restriction_string(ctx, policy);
1925 if (pwd_restriction_string) {
1926 _make_remark(ctx, PAM_ERROR_MSG,
1927 pwd_restriction_string);
1928 TALLOC_FREE(pwd_restriction_string);
1929 }
1930 }
1931 done:
1932 wbcFreeMemory(error);
1933 wbcFreeMemory(policy);
1934
1935 return ret;
1936}
1937
1938/*
1939 * Checks if a user has an account
1940 *
1941 * return values:
1942 * 1 = User not found
1943 * 0 = OK
1944 * -1 = System error
1945 */
1946static int valid_user(struct pwb_context *ctx,
1947 const char *user)
1948{
1949 /* check not only if the user is available over NSS calls, also make
1950 * sure it's really a winbind user, this is important when stacking PAM
1951 * modules in the 'account' or 'password' facility. */
1952
1953 wbcErr wbc_status;
1954 struct passwd *pwd = NULL;
1955 struct passwd *wb_pwd = NULL;
1956
1957 pwd = getpwnam(user);
1958 if (pwd == NULL) {
1959 return 1;
1960 }
1961
1962 wbc_status = wbcGetpwnam(user, &wb_pwd);
1963 wbcFreeMemory(wb_pwd);
1964 if (!WBC_ERROR_IS_OK(wbc_status)) {
1965 _pam_log(ctx, LOG_DEBUG, "valid_user: wbcGetpwnam gave %s\n",
1966 wbcErrorString(wbc_status));
1967 }
1968
1969 switch (wbc_status) {
1970 case WBC_ERR_UNKNOWN_USER:
1971 return 1;
1972 case WBC_ERR_SUCCESS:
1973 return 0;
1974 default:
1975 break;
1976 }
1977 return -1;
1978}
1979
1980static char *_pam_delete(register char *xx)
1981{
1982 _pam_overwrite(xx);
1983 _pam_drop(xx);
1984 return NULL;
1985}
1986
1987/*
1988 * obtain a password from the user
1989 */
1990
1991static int _winbind_read_password(struct pwb_context *ctx,
1992 unsigned int ctrl,
1993 const char *comment,
1994 const char *prompt1,
1995 const char *prompt2,
1996 const char **pass)
1997{
1998 int authtok_flag;
1999 int retval;
2000 const char *item;
2001 char *token;
2002
2003 _pam_log(ctx, LOG_DEBUG, "getting password (0x%08x)", ctrl);
2004
2005 /*
2006 * make sure nothing inappropriate gets returned
2007 */
2008
2009 *pass = token = NULL;
2010
2011 /*
2012 * which authentication token are we getting?
2013 */
2014
2015 if (on(WINBIND__OLD_PASSWORD, ctrl)) {
2016 authtok_flag = PAM_OLDAUTHTOK;
2017 } else {
2018 authtok_flag = PAM_AUTHTOK;
2019 }
2020
2021 /*
2022 * should we obtain the password from a PAM item ?
2023 */
2024
2025 if (on(WINBIND_TRY_FIRST_PASS_ARG, ctrl) ||
2026 on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2027 retval = _pam_get_item(ctx->pamh, authtok_flag, &item);
2028 if (retval != PAM_SUCCESS) {
2029 /* very strange. */
2030 _pam_log(ctx, LOG_ALERT,
2031 "pam_get_item returned error "
2032 "to unix-read-password");
2033 return retval;
2034 } else if (item != NULL) { /* we have a password! */
2035 *pass = item;
2036 item = NULL;
2037 _pam_log(ctx, LOG_DEBUG,
2038 "pam_get_item returned a password");
2039 return PAM_SUCCESS;
2040 } else if (on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2041 return PAM_AUTHTOK_RECOVER_ERR; /* didn't work */
2042 } else if (on(WINBIND_USE_AUTHTOK_ARG, ctrl)
2043 && off(WINBIND__OLD_PASSWORD, ctrl)) {
2044 return PAM_AUTHTOK_RECOVER_ERR;
2045 }
2046 }
2047 /*
2048 * getting here implies we will have to get the password from the
2049 * user directly.
2050 */
2051
2052 {
2053 struct pam_message msg[3], *pmsg[3];
2054 struct pam_response *resp;
2055 int i, replies;
2056
2057 /* prepare to converse */
2058
2059 if (comment != NULL && off(ctrl, WINBIND_SILENT)) {
2060 pmsg[0] = &msg[0];
2061 msg[0].msg_style = PAM_TEXT_INFO;
2062 msg[0].msg = discard_const_p(char, comment);
2063 i = 1;
2064 } else {
2065 i = 0;
2066 }
2067
2068 pmsg[i] = &msg[i];
2069 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2070 msg[i++].msg = discard_const_p(char, prompt1);
2071 replies = 1;
2072
2073 if (prompt2 != NULL) {
2074 pmsg[i] = &msg[i];
2075 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2076 msg[i++].msg = discard_const_p(char, prompt2);
2077 ++replies;
2078 }
2079 /* so call the conversation expecting i responses */
2080 resp = NULL;
2081 retval = converse(ctx->pamh, i, pmsg, &resp);
2082 if (resp == NULL) {
2083 if (retval == PAM_SUCCESS) {
2084 retval = PAM_AUTHTOK_RECOVER_ERR;
2085 }
2086 goto done;
2087 }
2088 if (retval != PAM_SUCCESS) {
2089 _pam_drop_reply(resp, i);
2090 goto done;
2091 }
2092
2093 /* interpret the response */
2094
2095 token = x_strdup(resp[i - replies].resp);
2096 if (!token) {
2097 _pam_log(ctx, LOG_NOTICE,
2098 "could not recover "
2099 "authentication token");
2100 retval = PAM_AUTHTOK_RECOVER_ERR;
2101 goto done;
2102 }
2103
2104 if (replies == 2) {
2105 /* verify that password entered correctly */
2106 if (!resp[i - 1].resp ||
2107 strcmp(token, resp[i - 1].resp)) {
2108 _pam_delete(token); /* mistyped */
2109 retval = PAM_AUTHTOK_RECOVER_ERR;
2110 _make_remark(ctx, PAM_ERROR_MSG,
2111 MISTYPED_PASS);
2112 }
2113 }
2114
2115 /*
2116 * tidy up the conversation (resp_retcode) is ignored
2117 * -- what is it for anyway? AGM
2118 */
2119 _pam_drop_reply(resp, i);
2120 }
2121
2122 done:
2123 if (retval != PAM_SUCCESS) {
2124 _pam_log_debug(ctx, LOG_DEBUG,
2125 "unable to obtain a password");
2126 return retval;
2127 }
2128 /* 'token' is the entered password */
2129
2130 /* we store this password as an item */
2131
2132 retval = pam_set_item(ctx->pamh, authtok_flag, token);
2133 _pam_delete(token); /* clean it up */
2134 if (retval != PAM_SUCCESS ||
2135 (retval = _pam_get_item(ctx->pamh, authtok_flag, &item)) != PAM_SUCCESS) {
2136
2137 _pam_log(ctx, LOG_CRIT, "error manipulating password");
2138 return retval;
2139
2140 }
2141
2142 *pass = item;
2143 item = NULL; /* break link to password */
2144
2145 return PAM_SUCCESS;
2146}
2147
2148static const char *get_conf_item_string(struct pwb_context *ctx,
2149 const char *item,
2150 int config_flag)
2151{
2152 int i = 0;
2153 const char *parm_opt = NULL;
2154
2155 if (!(ctx->ctrl & config_flag)) {
2156 goto out;
2157 }
2158
2159 /* let the pam opt take precedence over the pam_winbind.conf option */
2160 for (i=0; i<ctx->argc; i++) {
2161
2162 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2163 char *p;
2164
2165 if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2166 _pam_log(ctx, LOG_INFO,
2167 "no \"=\" delimiter for \"%s\" found\n",
2168 item);
2169 goto out;
2170 }
2171 _pam_log_debug(ctx, LOG_INFO,
2172 "PAM config: %s '%s'\n", item, p+1);
2173 return p + 1;
2174 }
2175 }
2176
2177 if (ctx->dict) {
2178 char *key = NULL;
2179
2180 key = talloc_asprintf(ctx, "global:%s", item);
2181 if (!key) {
2182 goto out;
2183 }
2184
2185 parm_opt = iniparser_getstr(ctx->dict, key);
2186 TALLOC_FREE(key);
2187
2188 _pam_log_debug(ctx, LOG_INFO, "CONFIG file: %s '%s'\n",
2189 item, parm_opt);
2190 }
2191out:
2192 return parm_opt;
2193}
2194
2195static int get_config_item_int(struct pwb_context *ctx,
2196 const char *item,
2197 int config_flag)
2198{
2199 int i, parm_opt = -1;
2200
2201 if (!(ctx->ctrl & config_flag)) {
2202 goto out;
2203 }
2204
2205 /* let the pam opt take precedence over the pam_winbind.conf option */
2206 for (i = 0; i < ctx->argc; i++) {
2207
2208 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2209 char *p;
2210
2211 if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2212 _pam_log(ctx, LOG_INFO,
2213 "no \"=\" delimiter for \"%s\" found\n",
2214 item);
2215 goto out;
2216 }
2217 parm_opt = atoi(p + 1);
2218 _pam_log_debug(ctx, LOG_INFO,
2219 "PAM config: %s '%d'\n",
2220 item, parm_opt);
2221 return parm_opt;
2222 }
2223 }
2224
2225 if (ctx->dict) {
2226 char *key = NULL;
2227
2228 key = talloc_asprintf(ctx, "global:%s", item);
2229 if (!key) {
2230 goto out;
2231 }
2232
2233 parm_opt = iniparser_getint(ctx->dict, key, -1);
2234 TALLOC_FREE(key);
2235
2236 _pam_log_debug(ctx, LOG_INFO,
2237 "CONFIG file: %s '%d'\n",
2238 item, parm_opt);
2239 }
2240out:
2241 return parm_opt;
2242}
2243
2244static const char *get_krb5_cc_type_from_config(struct pwb_context *ctx)
2245{
2246 return get_conf_item_string(ctx, "krb5_ccache_type",
2247 WINBIND_KRB5_CCACHE_TYPE);
2248}
2249
2250static const char *get_member_from_config(struct pwb_context *ctx)
2251{
2252 const char *ret = NULL;
2253 ret = get_conf_item_string(ctx, "require_membership_of",
2254 WINBIND_REQUIRED_MEMBERSHIP);
2255 if (ret) {
2256 return ret;
2257 }
2258 return get_conf_item_string(ctx, "require-membership-of",
2259 WINBIND_REQUIRED_MEMBERSHIP);
2260}
2261
2262static int get_warn_pwd_expire_from_config(struct pwb_context *ctx)
2263{
2264 int ret;
2265 ret = get_config_item_int(ctx, "warn_pwd_expire",
2266 WINBIND_WARN_PWD_EXPIRE);
2267 /* no or broken setting */
2268 if (ret <= 0) {
2269 return DEFAULT_DAYS_TO_WARN_BEFORE_PWD_EXPIRES;
2270 }
2271 return ret;
2272}
2273
2274/**
2275 * Retrieve the winbind separator.
2276 *
2277 * @param ctx PAM winbind context.
2278 *
2279 * @return string separator character. NULL on failure.
2280 */
2281
2282static char winbind_get_separator(struct pwb_context *ctx)
2283{
2284 wbcErr wbc_status;
2285 static struct wbcInterfaceDetails *details = NULL;
2286
2287 wbc_status = wbcInterfaceDetails(&details);
2288 if (!WBC_ERROR_IS_OK(wbc_status)) {
2289 _pam_log(ctx, LOG_ERR,
2290 "Could not retrieve winbind interface details: %s",
2291 wbcErrorString(wbc_status));
2292 return '\0';
2293 }
2294
2295 if (!details) {
2296 return '\0';
2297 }
2298
2299 return details->winbind_separator;
2300}
2301
2302
2303/**
2304 * Convert a upn to a name.
2305 *
2306 * @param ctx PAM winbind context.
2307 * @param upn USer UPN to be trabslated.
2308 *
2309 * @return converted name. NULL pointer on failure. Caller needs to free.
2310 */
2311
2312static char* winbind_upn_to_username(struct pwb_context *ctx,
2313 const char *upn)
2314{
2315 char sep;
2316 wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;
2317 struct wbcDomainSid sid;
2318 enum wbcSidType type;
2319 char *domain;
2320 char *name;
2321 char *p;
2322
2323 /* This cannot work when the winbind separator = @ */
2324
2325 sep = winbind_get_separator(ctx);
2326 if (!sep || sep == '@') {
2327 return NULL;
2328 }
2329
2330 name = talloc_strdup(ctx, upn);
2331 if (!name) {
2332 return NULL;
2333 }
2334
2335 if ((p = strchr(name, '@')) != NULL) {
2336 *p = 0;
2337 domain = p + 1;
2338 }
2339
2340 /* Convert the UPN to a SID */
2341
2342 wbc_status = wbcLookupName(domain, name, &sid, &type);
2343 if (!WBC_ERROR_IS_OK(wbc_status)) {
2344 return NULL;
2345 }
2346
2347 /* Convert the the SID back to the sAMAccountName */
2348
2349 wbc_status = wbcLookupSid(&sid, &domain, &name, &type);
2350 if (!WBC_ERROR_IS_OK(wbc_status)) {
2351 return NULL;
2352 }
2353
2354 return talloc_asprintf(ctx, "%s\\%s", domain, name);
2355}
2356
2357static int _pam_delete_cred(pam_handle_t *pamh, int flags,
2358 int argc, const char **argv)
2359{
2360 int retval = PAM_SUCCESS;
2361 struct pwb_context *ctx = NULL;
2362 struct wbcLogoffUserParams logoff;
2363 struct wbcAuthErrorInfo *error = NULL;
2364 const char *user;
2365 wbcErr wbc_status = WBC_ERR_SUCCESS;
2366
2367 ZERO_STRUCT(logoff);
2368
2369 retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2370 if (retval) {
2371 goto out;
2372 }
2373
2374 _PAM_LOG_FUNCTION_ENTER("_pam_delete_cred", ctx);
2375
2376 if (ctx->ctrl & WINBIND_KRB5_AUTH) {
2377
2378 /* destroy the ccache here */
2379
2380 uint32_t wbc_flags = 0;
2381 const char *ccname = NULL;
2382 struct passwd *pwd = NULL;
2383
2384 retval = pam_get_user(pamh, &user, _("Username: "));
2385 if (retval) {
2386 _pam_log(ctx, LOG_ERR,
2387 "could not identify user");
2388 goto out;
2389 }
2390
2391 if (user == NULL) {
2392 _pam_log(ctx, LOG_ERR,
2393 "username was NULL!");
2394 retval = PAM_USER_UNKNOWN;
2395 goto out;
2396 }
2397
2398 _pam_log_debug(ctx, LOG_DEBUG,
2399 "username [%s] obtained", user);
2400
2401 ccname = pam_getenv(pamh, "KRB5CCNAME");
2402 if (ccname == NULL) {
2403 _pam_log_debug(ctx, LOG_DEBUG,
2404 "user has no KRB5CCNAME environment");
2405 }
2406
2407 pwd = getpwnam(user);
2408 if (pwd == NULL) {
2409 retval = PAM_USER_UNKNOWN;
2410 goto out;
2411 }
2412
2413 wbc_flags = WBFLAG_PAM_KRB5 |
2414 WBFLAG_PAM_CONTACT_TRUSTDOM;
2415
2416 logoff.username = user;
2417
2418 if (ccname) {
2419 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2420 &logoff.blobs,
2421 "ccfilename",
2422 0,
2423 (uint8_t *)ccname,
2424 strlen(ccname)+1);
2425 if (!WBC_ERROR_IS_OK(wbc_status)) {
2426 goto out;
2427 }
2428 }
2429
2430 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2431 &logoff.blobs,
2432 "flags",
2433 0,
2434 (uint8_t *)&wbc_flags,
2435 sizeof(wbc_flags));
2436 if (!WBC_ERROR_IS_OK(wbc_status)) {
2437 goto out;
2438 }
2439
2440 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2441 &logoff.blobs,
2442 "user_uid",
2443 0,
2444 (uint8_t *)&pwd->pw_uid,
2445 sizeof(pwd->pw_uid));
2446 if (!WBC_ERROR_IS_OK(wbc_status)) {
2447 goto out;
2448 }
2449
2450 wbc_status = wbcLogoffUserEx(&logoff, &error);
2451 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2452 user, "wbcLogoffUser");
2453 wbcFreeMemory(error);
2454 wbcFreeMemory(logoff.blobs);
2455 logoff.blobs = NULL;
2456
2457 if (!WBC_ERROR_IS_OK(wbc_status)) {
2458 _pam_log(ctx, LOG_INFO,
2459 "failed to logoff user %s: %s\n",
2460 user, wbcErrorString(wbc_status));
2461 }
2462 }
2463
2464out:
2465 if (logoff.blobs) {
2466 wbcFreeMemory(logoff.blobs);
2467 }
2468
2469 if (!WBC_ERROR_IS_OK(wbc_status)) {
2470 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2471 user, "wbcLogoffUser");
2472 }
2473
2474 /*
2475 * Delete the krb5 ccname variable from the PAM environment
2476 * if it was set by winbind.
2477 */
2478 if ((ctx->ctrl & WINBIND_KRB5_AUTH) && pam_getenv(pamh, "KRB5CCNAME")) {
2479 pam_putenv(pamh, "KRB5CCNAME");
2480 }
2481
2482 _PAM_LOG_FUNCTION_LEAVE("_pam_delete_cred", ctx, retval);
2483
2484 TALLOC_FREE(ctx);
2485
2486 return retval;
2487}
2488
2489PAM_EXTERN
2490int pam_sm_authenticate(pam_handle_t *pamh, int flags,
2491 int argc, const char **argv)
2492{
2493 const char *username;
2494 const char *password;
2495 const char *member = NULL;
2496 const char *cctype = NULL;
2497 int warn_pwd_expire;
2498 int retval = PAM_AUTH_ERR;
2499 char *username_ret = NULL;
2500 char *new_authtok_required = NULL;
2501 char *real_username = NULL;
2502 struct pwb_context *ctx = NULL;
2503
2504 retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2505 if (retval) {
2506 goto out;
2507 }
2508
2509 _PAM_LOG_FUNCTION_ENTER("pam_sm_authenticate", ctx);
2510
2511 /* Get the username */
2512 retval = pam_get_user(pamh, &username, NULL);
2513 if ((retval != PAM_SUCCESS) || (!username)) {
2514 _pam_log_debug(ctx, LOG_DEBUG,
2515 "can not get the username");
2516 retval = PAM_SERVICE_ERR;
2517 goto out;
2518 }
2519
2520
2521#if defined(AIX)
2522 /* Decode the user name since AIX does not support logn user
2523 names by default. The name is encoded as _#uid. */
2524
2525 if (username[0] == '_') {
2526 uid_t id = atoi(&username[1]);
2527 struct passwd *pw = NULL;
2528
2529 if ((id!=0) && ((pw = getpwuid(id)) != NULL)) {
2530 real_username = strdup(pw->pw_name);
2531 }
2532 }
2533#endif
2534
2535 if (!real_username) {
2536 /* Just making a copy of the username we got from PAM */
2537 if ((real_username = strdup(username)) == NULL) {
2538 _pam_log_debug(ctx, LOG_DEBUG,
2539 "memory allocation failure when copying "
2540 "username");
2541 retval = PAM_SERVICE_ERR;
2542 goto out;
2543 }
2544 }
2545
2546 /* Maybe this was a UPN */
2547
2548 if (strchr(real_username, '@') != NULL) {
2549 char *samaccountname = NULL;
2550
2551 samaccountname = winbind_upn_to_username(ctx,
2552 real_username);
2553 if (samaccountname) {
2554 free(real_username);
2555 real_username = strdup(samaccountname);
2556 }
2557 }
2558
2559 retval = _winbind_read_password(ctx, ctx->ctrl, NULL,
2560 _("Password: "), NULL,
2561 &password);
2562
2563 if (retval != PAM_SUCCESS) {
2564 _pam_log(ctx, LOG_ERR,
2565 "Could not retrieve user's password");
2566 retval = PAM_AUTHTOK_ERR;
2567 goto out;
2568 }
2569
2570 /* Let's not give too much away in the log file */
2571
2572#ifdef DEBUG_PASSWORD
2573 _pam_log_debug(ctx, LOG_INFO,
2574 "Verify user '%s' with password '%s'",
2575 real_username, password);
2576#else
2577 _pam_log_debug(ctx, LOG_INFO,
2578 "Verify user '%s'", real_username);
2579#endif
2580
2581 member = get_member_from_config(ctx);
2582 cctype = get_krb5_cc_type_from_config(ctx);
2583 warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
2584
2585 /* Now use the username to look up password */
2586 retval = winbind_auth_request(ctx, real_username, password,
2587 member, cctype, warn_pwd_expire,
2588 NULL, NULL, NULL,
2589 NULL, &username_ret);
2590
2591 if (retval == PAM_NEW_AUTHTOK_REQD ||
2592 retval == PAM_AUTHTOK_EXPIRED) {
2593
2594 char *new_authtok_required_during_auth = NULL;
2595
2596 new_authtok_required = talloc_asprintf(NULL, "%d", retval);
2597 if (!new_authtok_required) {
2598 retval = PAM_BUF_ERR;
2599 goto out;
2600 }
2601
2602 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2603 new_authtok_required,
2604 _pam_winbind_cleanup_func);
2605
2606 retval = PAM_SUCCESS;
2607
2608 new_authtok_required_during_auth = talloc_asprintf(NULL, "%d", true);
2609 if (!new_authtok_required_during_auth) {
2610 retval = PAM_BUF_ERR;
2611 goto out;
2612 }
2613
2614 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2615 new_authtok_required_during_auth,
2616 _pam_winbind_cleanup_func);
2617
2618 goto out;
2619 }
2620
2621out:
2622 if (username_ret) {
2623 pam_set_item (pamh, PAM_USER, username_ret);
2624 _pam_log_debug(ctx, LOG_INFO,
2625 "Returned user was '%s'", username_ret);
2626 free(username_ret);
2627 }
2628
2629 if (real_username) {
2630 free(real_username);
2631 }
2632
2633 if (!new_authtok_required) {
2634 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, NULL, NULL);
2635 }
2636
2637 if (retval != PAM_SUCCESS) {
2638 _pam_free_data_info3(pamh);
2639 }
2640
2641 _PAM_LOG_FUNCTION_LEAVE("pam_sm_authenticate", ctx, retval);
2642
2643 TALLOC_FREE(ctx);
2644
2645 return retval;
2646}
2647
2648PAM_EXTERN
2649int pam_sm_setcred(pam_handle_t *pamh, int flags,
2650 int argc, const char **argv)
2651{
2652 int ret = PAM_SYSTEM_ERR;
2653 struct pwb_context *ctx = NULL;
2654
2655 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2656 if (ret) {
2657 goto out;
2658 }
2659
2660 _PAM_LOG_FUNCTION_ENTER("pam_sm_setcred", ctx);
2661
2662 switch (flags & ~PAM_SILENT) {
2663
2664 case PAM_DELETE_CRED:
2665 ret = _pam_delete_cred(pamh, flags, argc, argv);
2666 break;
2667 case PAM_REFRESH_CRED:
2668 _pam_log_debug(ctx, LOG_WARNING,
2669 "PAM_REFRESH_CRED not implemented");
2670 ret = PAM_SUCCESS;
2671 break;
2672 case PAM_REINITIALIZE_CRED:
2673 _pam_log_debug(ctx, LOG_WARNING,
2674 "PAM_REINITIALIZE_CRED not implemented");
2675 ret = PAM_SUCCESS;
2676 break;
2677 case PAM_ESTABLISH_CRED:
2678 _pam_log_debug(ctx, LOG_WARNING,
2679 "PAM_ESTABLISH_CRED not implemented");
2680 ret = PAM_SUCCESS;
2681 break;
2682 default:
2683 ret = PAM_SYSTEM_ERR;
2684 break;
2685 }
2686
2687 out:
2688
2689 _PAM_LOG_FUNCTION_LEAVE("pam_sm_setcred", ctx, ret);
2690
2691 TALLOC_FREE(ctx);
2692
2693 return ret;
2694}
2695
2696/*
2697 * Account management. We want to verify that the account exists
2698 * before returning PAM_SUCCESS
2699 */
2700PAM_EXTERN
2701int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
2702 int argc, const char **argv)
2703{
2704 const char *username;
2705 int ret = PAM_USER_UNKNOWN;
2706 void *tmp = NULL;
2707 struct pwb_context *ctx = NULL;
2708
2709 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2710 if (ret) {
2711 goto out;
2712 }
2713
2714 _PAM_LOG_FUNCTION_ENTER("pam_sm_acct_mgmt", ctx);
2715
2716
2717 /* Get the username */
2718 ret = pam_get_user(pamh, &username, NULL);
2719 if ((ret != PAM_SUCCESS) || (!username)) {
2720 _pam_log_debug(ctx, LOG_DEBUG,
2721 "can not get the username");
2722 ret = PAM_SERVICE_ERR;
2723 goto out;
2724 }
2725
2726 /* Verify the username */
2727 ret = valid_user(ctx, username);
2728 switch (ret) {
2729 case -1:
2730 /* some sort of system error. The log was already printed */
2731 ret = PAM_SERVICE_ERR;
2732 goto out;
2733 case 1:
2734 /* the user does not exist */
2735 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
2736 username);
2737 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
2738 ret = PAM_IGNORE;
2739 goto out;
2740 }
2741 ret = PAM_USER_UNKNOWN;
2742 goto out;
2743 case 0:
2744 pam_get_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2745 (const void **)&tmp);
2746 if (tmp != NULL) {
2747 ret = atoi((const char *)tmp);
2748 switch (ret) {
2749 case PAM_AUTHTOK_EXPIRED:
2750 /* fall through, since new token is required in this case */
2751 case PAM_NEW_AUTHTOK_REQD:
2752 _pam_log(ctx, LOG_WARNING,
2753 "pam_sm_acct_mgmt success but %s is set",
2754 PAM_WINBIND_NEW_AUTHTOK_REQD);
2755 _pam_log(ctx, LOG_NOTICE,
2756 "user '%s' needs new password",
2757 username);
2758 /* PAM_AUTHTOKEN_REQD does not exist, but is documented in the manpage */
2759 ret = PAM_NEW_AUTHTOK_REQD;
2760 goto out;
2761 default:
2762 _pam_log(ctx, LOG_WARNING,
2763 "pam_sm_acct_mgmt success");
2764 _pam_log(ctx, LOG_NOTICE,
2765 "user '%s' granted access", username);
2766 ret = PAM_SUCCESS;
2767 goto out;
2768 }
2769 }
2770
2771 /* Otherwise, the authentication looked good */
2772 _pam_log(ctx, LOG_NOTICE,
2773 "user '%s' granted access", username);
2774 ret = PAM_SUCCESS;
2775 goto out;
2776 default:
2777 /* we don't know anything about this return value */
2778 _pam_log(ctx, LOG_ERR,
2779 "internal module error (ret = %d, user = '%s')",
2780 ret, username);
2781 ret = PAM_SERVICE_ERR;
2782 goto out;
2783 }
2784
2785 /* should not be reached */
2786 ret = PAM_IGNORE;
2787
2788 out:
2789
2790 _PAM_LOG_FUNCTION_LEAVE("pam_sm_acct_mgmt", ctx, ret);
2791
2792 TALLOC_FREE(ctx);
2793
2794 return ret;
2795}
2796
2797PAM_EXTERN
2798int pam_sm_open_session(pam_handle_t *pamh, int flags,
2799 int argc, const char **argv)
2800{
2801 int ret = PAM_SUCCESS;
2802 struct pwb_context *ctx = NULL;
2803
2804 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2805 if (ret) {
2806 goto out;
2807 }
2808
2809 _PAM_LOG_FUNCTION_ENTER("pam_sm_open_session", ctx);
2810
2811 if (ctx->ctrl & WINBIND_MKHOMEDIR) {
2812 /* check and create homedir */
2813 ret = _pam_mkhomedir(ctx);
2814 }
2815 out:
2816 _PAM_LOG_FUNCTION_LEAVE("pam_sm_open_session", ctx, ret);
2817
2818 TALLOC_FREE(ctx);
2819
2820 return ret;
2821}
2822
2823PAM_EXTERN
2824int pam_sm_close_session(pam_handle_t *pamh, int flags,
2825 int argc, const char **argv)
2826{
2827 int ret = PAM_SUCCESS;
2828 struct pwb_context *ctx = NULL;
2829
2830 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2831 if (ret) {
2832 goto out;
2833 }
2834
2835 _PAM_LOG_FUNCTION_ENTER("pam_sm_close_session", ctx);
2836
2837out:
2838 _PAM_LOG_FUNCTION_LEAVE("pam_sm_close_session", ctx, ret);
2839
2840 TALLOC_FREE(ctx);
2841
2842 return ret;
2843}
2844
2845/**
2846 * evaluate whether we need to re-authenticate with kerberos after a
2847 * password change
2848 *
2849 * @param ctx PAM winbind context.
2850 * @param user The username
2851 *
2852 * @return boolean Returns true if required, false if not.
2853 */
2854
2855static bool _pam_require_krb5_auth_after_chauthtok(struct pwb_context *ctx,
2856 const char *user)
2857{
2858
2859 /* Make sure that we only do this if a) the chauthtok got initiated
2860 * during a logon attempt (authenticate->acct_mgmt->chauthtok) b) any
2861 * later password change via the "passwd" command if done by the user
2862 * itself
2863 * NB. If we login from gdm or xdm and the password expires,
2864 * we change the password, but there is no memory cache.
2865 * Thus, even for passthrough login, we should do the
2866 * authentication again to update memory cache.
2867 * --- BoYang
2868 * */
2869
2870 char *new_authtok_reqd_during_auth = NULL;
2871 struct passwd *pwd = NULL;
2872
2873 _pam_get_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2874 &new_authtok_reqd_during_auth);
2875 pam_set_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2876 NULL, NULL);
2877
2878 if (new_authtok_reqd_during_auth) {
2879 return true;
2880 }
2881
2882 pwd = getpwnam(user);
2883 if (!pwd) {
2884 return false;
2885 }
2886
2887 if (getuid() == pwd->pw_uid) {
2888 return true;
2889 }
2890
2891 return false;
2892}
2893
2894
2895PAM_EXTERN
2896int pam_sm_chauthtok(pam_handle_t * pamh, int flags,
2897 int argc, const char **argv)
2898{
2899 unsigned int lctrl;
2900 int ret;
2901 bool cached_login = false;
2902
2903 /* <DO NOT free() THESE> */
2904 const char *user;
2905 char *pass_old, *pass_new;
2906 /* </DO NOT free() THESE> */
2907
2908 char *Announce;
2909
2910 int retry = 0;
2911 char *username_ret = NULL;
2912 struct wbcAuthErrorInfo *error = NULL;
2913 struct pwb_context *ctx = NULL;
2914
2915 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2916 if (ret) {
2917 goto out;
2918 }
2919
2920 _PAM_LOG_FUNCTION_ENTER("pam_sm_chauthtok", ctx);
2921
2922 cached_login = (ctx->ctrl & WINBIND_CACHED_LOGIN);
2923
2924 /* clearing offline bit for auth */
2925 ctx->ctrl &= ~WINBIND_CACHED_LOGIN;
2926
2927 /*
2928 * First get the name of a user
2929 */
2930 ret = pam_get_user(pamh, &user, _("Username: "));
2931 if (ret) {
2932 _pam_log(ctx, LOG_ERR,
2933 "password - could not identify user");
2934 goto out;
2935 }
2936
2937 if (user == NULL) {
2938 _pam_log(ctx, LOG_ERR, "username was NULL!");
2939 ret = PAM_USER_UNKNOWN;
2940 goto out;
2941 }
2942
2943 _pam_log_debug(ctx, LOG_DEBUG, "username [%s] obtained", user);
2944
2945 /* check if this is really a user in winbindd, not only in NSS */
2946 ret = valid_user(ctx, user);
2947 switch (ret) {
2948 case 1:
2949 ret = PAM_USER_UNKNOWN;
2950 goto out;
2951 case -1:
2952 ret = PAM_SYSTEM_ERR;
2953 goto out;
2954 default:
2955 break;
2956 }
2957
2958 /*
2959 * obtain and verify the current password (OLDAUTHTOK) for
2960 * the user.
2961 */
2962
2963 if (flags & PAM_PRELIM_CHECK) {
2964 time_t pwdlastset_prelim = 0;
2965
2966 /* instruct user what is happening */
2967
2968#define greeting _("Changing password for ")
2969 Announce = talloc_asprintf(ctx, "%s %s", greeting, user);
2970 if (!Announce) {
2971 _pam_log(ctx, LOG_CRIT,
2972 "password - out of memory");
2973 ret = PAM_BUF_ERR;
2974 goto out;
2975 }
2976#undef greeting
2977
2978 lctrl = ctx->ctrl | WINBIND__OLD_PASSWORD;
2979 ret = _winbind_read_password(ctx, lctrl,
2980 Announce,
2981 _("(current) NT password: "),
2982 NULL,
2983 (const char **) &pass_old);
2984 TALLOC_FREE(Announce);
2985 if (ret != PAM_SUCCESS) {
2986 _pam_log(ctx, LOG_NOTICE,
2987 "password - (old) token not obtained");
2988 goto out;
2989 }
2990
2991 /* verify that this is the password for this user */
2992
2993 ret = winbind_auth_request(ctx, user, pass_old,
2994 NULL, NULL, 0,
2995 &error, NULL, NULL,
2996 &pwdlastset_prelim, NULL);
2997
2998 if (ret != PAM_ACCT_EXPIRED &&
2999 ret != PAM_AUTHTOK_EXPIRED &&
3000 ret != PAM_NEW_AUTHTOK_REQD &&
3001 ret != PAM_SUCCESS) {
3002 pass_old = NULL;
3003 goto out;
3004 }
3005
3006 pam_set_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3007 (void *)pwdlastset_prelim, NULL);
3008
3009 ret = pam_set_item(pamh, PAM_OLDAUTHTOK,
3010 (const void *) pass_old);
3011 pass_old = NULL;
3012 if (ret != PAM_SUCCESS) {
3013 _pam_log(ctx, LOG_CRIT,
3014 "failed to set PAM_OLDAUTHTOK");
3015 }
3016 } else if (flags & PAM_UPDATE_AUTHTOK) {
3017
3018 time_t pwdlastset_update = 0;
3019
3020 /*
3021 * obtain the proposed password
3022 */
3023
3024 /*
3025 * get the old token back.
3026 */
3027
3028 ret = _pam_get_item(pamh, PAM_OLDAUTHTOK, &pass_old);
3029
3030 if (ret != PAM_SUCCESS) {
3031 _pam_log(ctx, LOG_NOTICE,
3032 "user not authenticated");
3033 goto out;
3034 }
3035
3036 lctrl = ctx->ctrl & ~WINBIND_TRY_FIRST_PASS_ARG;
3037
3038 if (on(WINBIND_USE_AUTHTOK_ARG, lctrl)) {
3039 lctrl |= WINBIND_USE_FIRST_PASS_ARG;
3040 }
3041 retry = 0;
3042 ret = PAM_AUTHTOK_ERR;
3043 while ((ret != PAM_SUCCESS) && (retry++ < MAX_PASSWD_TRIES)) {
3044 /*
3045 * use_authtok is to force the use of a previously entered
3046 * password -- needed for pluggable password strength checking
3047 */
3048
3049 ret = _winbind_read_password(ctx, lctrl,
3050 NULL,
3051 _("Enter new NT password: "),
3052 _("Retype new NT password: "),
3053 (const char **)&pass_new);
3054
3055 if (ret != PAM_SUCCESS) {
3056 _pam_log_debug(ctx, LOG_ALERT,
3057 "password - "
3058 "new password not obtained");
3059 pass_old = NULL;/* tidy up */
3060 goto out;
3061 }
3062
3063 /*
3064 * At this point we know who the user is and what they
3065 * propose as their new password. Verify that the new
3066 * password is acceptable.
3067 */
3068
3069 if (pass_new[0] == '\0') {/* "\0" password = NULL */
3070 pass_new = NULL;
3071 }
3072 }
3073
3074 /*
3075 * By reaching here we have approved the passwords and must now
3076 * rebuild the password database file.
3077 */
3078 _pam_get_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3079 &pwdlastset_update);
3080
3081 /*
3082 * if cached creds were enabled, make sure to set the
3083 * WINBIND_CACHED_LOGIN bit here in order to have winbindd
3084 * update the cached creds storage - gd
3085 */
3086 if (cached_login) {
3087 ctx->ctrl |= WINBIND_CACHED_LOGIN;
3088 }
3089
3090 ret = winbind_chauthtok_request(ctx, user, pass_old,
3091 pass_new, pwdlastset_update);
3092 if (ret) {
3093 pass_old = pass_new = NULL;
3094 goto out;
3095 }
3096
3097 if (_pam_require_krb5_auth_after_chauthtok(ctx, user)) {
3098
3099 const char *member = NULL;
3100 const char *cctype = NULL;
3101 int warn_pwd_expire;
3102 struct wbcLogonUserInfo *info = NULL;
3103 struct wbcUserPasswordPolicyInfo *policy = NULL;
3104
3105 member = get_member_from_config(ctx);
3106 cctype = get_krb5_cc_type_from_config(ctx);
3107 warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
3108
3109 /* Keep WINBIND_CACHED_LOGIN bit for
3110 * authentication after changing the password.
3111 * This will update the cached credentials in case
3112 * that winbindd_dual_pam_chauthtok() fails
3113 * to update them.
3114 * --- BoYang
3115 * */
3116
3117 ret = winbind_auth_request(ctx, user, pass_new,
3118 member, cctype, 0,
3119 &error, &info, &policy,
3120 NULL, &username_ret);
3121 pass_old = pass_new = NULL;
3122
3123 if (ret == PAM_SUCCESS) {
3124
3125 struct wbcAuthUserInfo *user_info = NULL;
3126
3127 if (info && info->info) {
3128 user_info = info->info;
3129 }
3130
3131 /* warn a user if the password is about to
3132 * expire soon */
3133 _pam_warn_password_expiry(ctx, user_info, policy,
3134 warn_pwd_expire,
3135 NULL);
3136
3137 /* set some info3 info for other modules in the
3138 * stack */
3139 _pam_set_data_info3(ctx, user_info);
3140
3141 /* put krb5ccname into env */
3142 _pam_setup_krb5_env(ctx, info);
3143
3144 if (username_ret) {
3145 pam_set_item(pamh, PAM_USER,
3146 username_ret);
3147 _pam_log_debug(ctx, LOG_INFO,
3148 "Returned user was '%s'",
3149 username_ret);
3150 free(username_ret);
3151 }
3152
3153 }
3154
3155 if (info && info->blobs) {
3156 wbcFreeMemory(info->blobs);
3157 }
3158 wbcFreeMemory(info);
3159 wbcFreeMemory(policy);
3160
3161 goto out;
3162 }
3163 } else {
3164 ret = PAM_SERVICE_ERR;
3165 }
3166
3167out:
3168 {
3169 /* Deal with offline errors. */
3170 int i;
3171 const char *codes[] = {
3172 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
3173 "NT_STATUS_NO_LOGON_SERVERS",
3174 "NT_STATUS_ACCESS_DENIED"
3175 };
3176
3177 for (i=0; i<ARRAY_SIZE(codes); i++) {
3178 int _ret;
3179 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
3180 break;
3181 }
3182 }
3183 }
3184
3185 wbcFreeMemory(error);
3186
3187 _PAM_LOG_FUNCTION_LEAVE("pam_sm_chauthtok", ctx, ret);
3188
3189 TALLOC_FREE(ctx);
3190
3191 return ret;
3192}
3193
3194#ifdef PAM_STATIC
3195
3196/* static module data */
3197
3198struct pam_module _pam_winbind_modstruct = {
3199 MODULE_NAME,
3200 pam_sm_authenticate,
3201 pam_sm_setcred,
3202 pam_sm_acct_mgmt,
3203 pam_sm_open_session,
3204 pam_sm_close_session,
3205 pam_sm_chauthtok
3206};
3207
3208#endif
3209
3210/*
3211 * Copyright (c) Andrew Tridgell <tridge@samba.org> 2000
3212 * Copyright (c) Tim Potter <tpot@samba.org> 2000
3213 * Copyright (c) Andrew Bartlettt <abartlet@samba.org> 2002
3214 * Copyright (c) Guenther Deschner <gd@samba.org> 2005-2008
3215 * Copyright (c) Jan Rêkorajski 1999.
3216 * Copyright (c) Andrew G. Morgan 1996-8.
3217 * Copyright (c) Alex O. Yuriev, 1996.
3218 * Copyright (c) Cristian Gafton 1996.
3219 * Copyright (C) Elliot Lee <sopwith@redhat.com> 1996, Red Hat Software.
3220 *
3221 * Redistribution and use in source and binary forms, with or without
3222 * modification, are permitted provided that the following conditions
3223 * are met:
3224 * 1. Redistributions of source code must retain the above copyright
3225 * notice, and the entire permission notice in its entirety,
3226 * including the disclaimer of warranties.
3227 * 2. Redistributions in binary form must reproduce the above copyright
3228 * notice, this list of conditions and the following disclaimer in the
3229 * documentation and/or other materials provided with the distribution.
3230 * 3. The name of the author may not be used to endorse or promote
3231 * products derived from this software without specific prior
3232 * written permission.
3233 *
3234 * ALTERNATIVELY, this product may be distributed under the terms of
3235 * the GNU Public License, in which case the provisions of the GPL are
3236 * required INSTEAD OF the above restrictions. (This clause is
3237 * necessary due to a potential bad interaction between the GPL and
3238 * the restrictions contained in a BSD-style copyright.)
3239 *
3240 * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
3241 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
3242 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
3243 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
3244 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
3245 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
3246 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
3247 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
3248 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
3249 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
3250 * OF THE POSSIBILITY OF SUCH DAMAGE.
3251 */
Note: See TracBrowser for help on using the repository browser.