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More const fixes. Remove CONST_DISCARD.
[Samba/gebeck_regimport.git] / nsswitch / pam_winbind.c
blobf7637e7ea70fca21e6351566d2a72677ed43d063
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_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
151 static char initialized = 0;
152
153 static inline void textdomain_init(void);
154 static inline void textdomain_init(void)
155 {
156 if (!initialized) {
157 bindtextdomain(MODULE_NAME, 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 */
169 static 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 }
176 static 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
187 static 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
195 static 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
218 static bool _pam_log_is_silent(int ctrl)
219 {
220 return on(ctrl, WINBIND_SILENT);
221 }
222
223 static void _pam_log(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
224 static 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 }
236 static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
237 static 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
250 static 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
267 static 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
276 static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
277 static 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 }
289 static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
290 static 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
303 static 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
351 static 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
385 static 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(discard_const_p(char, config_file));
414 if (d == NULL) {
415 goto config_from_pam;
416 }
417
418 if (iniparser_getboolean(d, discard_const_p(char, "global:debug"), false)) {
419 ctrl |= WINBIND_DEBUG_ARG;
420 }
421
422 if (iniparser_getboolean(d, discard_const_p(char, "global:debug_state"), false)) {
423 ctrl |= WINBIND_DEBUG_STATE;
424 }
425
426 if (iniparser_getboolean(d, discard_const_p(char, "global:cached_login"), false)) {
427 ctrl |= WINBIND_CACHED_LOGIN;
428 }
429
430 if (iniparser_getboolean(d, discard_const_p(char, "global:krb5_auth"), false)) {
431 ctrl |= WINBIND_KRB5_AUTH;
432 }
433
434 if (iniparser_getboolean(d, discard_const_p(char, "global:silent"), false)) {
435 ctrl |= WINBIND_SILENT;
436 }
437
438 if (iniparser_getstr(d, discard_const_p(char, "global:krb5_ccache_type")) != NULL) {
439 ctrl |= WINBIND_KRB5_CCACHE_TYPE;
440 }
441
442 if ((iniparser_getstr(d, discard_const_p(char, "global:require-membership-of"))
443 != NULL) ||
444 (iniparser_getstr(d, discard_const_p(char, "global:require_membership_of"))
445 != NULL)) {
446 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
447 }
448
449 if (iniparser_getboolean(d, discard_const_p(char, "global:try_first_pass"), false)) {
450 ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
451 }
452
453 if (iniparser_getint(d, discard_const_p(char, "global:warn_pwd_expire"), 0)) {
454 ctrl |= WINBIND_WARN_PWD_EXPIRE;
455 }
456
457 if (iniparser_getboolean(d, discard_const_p(char, "global:mkhomedir"), false)) {
458 ctrl |= WINBIND_MKHOMEDIR;
459 }
460
461 config_from_pam:
462 /* step through arguments */
463 for (i=argc,v=argv; i-- > 0; ++v) {
464
465 /* generic options */
466 if (!strcmp(*v,"debug"))
467 ctrl |= WINBIND_DEBUG_ARG;
468 else if (!strcasecmp(*v, "debug_state"))
469 ctrl |= WINBIND_DEBUG_STATE;
470 else if (!strcasecmp(*v, "silent"))
471 ctrl |= WINBIND_SILENT;
472 else if (!strcasecmp(*v, "use_authtok"))
473 ctrl |= WINBIND_USE_AUTHTOK_ARG;
474 else if (!strcasecmp(*v, "use_first_pass"))
475 ctrl |= WINBIND_USE_FIRST_PASS_ARG;
476 else if (!strcasecmp(*v, "try_first_pass"))
477 ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
478 else if (!strcasecmp(*v, "unknown_ok"))
479 ctrl |= WINBIND_UNKNOWN_OK_ARG;
480 else if (!strncasecmp(*v, "require_membership_of",
481 strlen("require_membership_of")))
482 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
483 else if (!strncasecmp(*v, "require-membership-of",
484 strlen("require-membership-of")))
485 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
486 else if (!strcasecmp(*v, "krb5_auth"))
487 ctrl |= WINBIND_KRB5_AUTH;
488 else if (!strncasecmp(*v, "krb5_ccache_type",
489 strlen("krb5_ccache_type")))
490 ctrl |= WINBIND_KRB5_CCACHE_TYPE;
491 else if (!strcasecmp(*v, "cached_login"))
492 ctrl |= WINBIND_CACHED_LOGIN;
493 else if (!strcasecmp(*v, "mkhomedir"))
494 ctrl |= WINBIND_MKHOMEDIR;
495 else {
496 __pam_log(pamh, ctrl, LOG_ERR,
497 "pam_parse: unknown option: %s", *v);
498 return -1;
499 }
500
501 }
502
503 if (result_d) {
504 *result_d = d;
505 } else {
506 if (d) {
507 iniparser_freedict(d);
508 }
509 }
510
511 return ctrl;
512 };
513
514 static int _pam_winbind_free_context(struct pwb_context *ctx)
515 {
516 if (!ctx) {
517 return 0;
518 }
519
520 if (ctx->dict) {
521 iniparser_freedict(ctx->dict);
522 }
523
524 return 0;
525 }
526
527 static int _pam_winbind_init_context(pam_handle_t *pamh,
528 int flags,
529 int argc,
530 const char **argv,
531 struct pwb_context **ctx_p)
532 {
533 struct pwb_context *r = NULL;
534
535 #ifdef HAVE_GETTEXT
536 textdomain_init();
537 #endif
538
539 r = TALLOC_ZERO_P(NULL, struct pwb_context);
540 if (!r) {
541 return PAM_BUF_ERR;
542 }
543
544 talloc_set_destructor(r, _pam_winbind_free_context);
545
546 r->pamh = pamh;
547 r->flags = flags;
548 r->argc = argc;
549 r->argv = argv;
550 r->ctrl = _pam_parse(pamh, flags, argc, argv, &r->dict);
551 if (r->ctrl == -1) {
552 TALLOC_FREE(r);
553 return PAM_SYSTEM_ERR;
554 }
555
556 *ctx_p = r;
557
558 return PAM_SUCCESS;
559 }
560
561 static void _pam_winbind_cleanup_func(pam_handle_t *pamh,
562 void *data,
563 int error_status)
564 {
565 int ctrl = _pam_parse(pamh, 0, 0, NULL, NULL);
566 if (_pam_log_is_debug_state_enabled(ctrl)) {
567 __pam_log_debug(pamh, ctrl, LOG_DEBUG,
568 "[pamh: %p] CLEAN: cleaning up PAM data %p "
569 "(error_status = %d)", pamh, data,
570 error_status);
571 }
572 TALLOC_FREE(data);
573 }
574
575
576 static const struct ntstatus_errors {
577 const char *ntstatus_string;
578 const char *error_string;
579 } ntstatus_errors[] = {
580 {"NT_STATUS_OK",
581 N_("Success")},
582 {"NT_STATUS_BACKUP_CONTROLLER",
583 N_("No primary Domain Controler available")},
584 {"NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
585 N_("No domain controllers found")},
586 {"NT_STATUS_NO_LOGON_SERVERS",
587 N_("No logon servers")},
588 {"NT_STATUS_PWD_TOO_SHORT",
589 N_("Password too short")},
590 {"NT_STATUS_PWD_TOO_RECENT",
591 N_("The password of this user is too recent to change")},
592 {"NT_STATUS_PWD_HISTORY_CONFLICT",
593 N_("Password is already in password history")},
594 {"NT_STATUS_PASSWORD_EXPIRED",
595 N_("Your password has expired")},
596 {"NT_STATUS_PASSWORD_MUST_CHANGE",
597 N_("You need to change your password now")},
598 {"NT_STATUS_INVALID_WORKSTATION",
599 N_("You are not allowed to logon from this workstation")},
600 {"NT_STATUS_INVALID_LOGON_HOURS",
601 N_("You are not allowed to logon at this time")},
602 {"NT_STATUS_ACCOUNT_EXPIRED",
603 N_("Your account has expired. "
604 "Please contact your System administrator")}, /* SCNR */
605 {"NT_STATUS_ACCOUNT_DISABLED",
606 N_("Your account is disabled. "
607 "Please contact your System administrator")}, /* SCNR */
608 {"NT_STATUS_ACCOUNT_LOCKED_OUT",
609 N_("Your account has been locked. "
610 "Please contact your System administrator")}, /* SCNR */
611 {"NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
612 N_("Invalid Trust Account")},
613 {"NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
614 N_("Invalid Trust Account")},
615 {"NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
616 N_("Invalid Trust Account")},
617 {"NT_STATUS_ACCESS_DENIED",
618 N_("Access is denied")},
619 {NULL, NULL}
620 };
621
622 static const char *_get_ntstatus_error_string(const char *nt_status_string)
623 {
624 int i;
625 for (i=0; ntstatus_errors[i].ntstatus_string != NULL; i++) {
626 if (!strcasecmp(ntstatus_errors[i].ntstatus_string,
627 nt_status_string)) {
628 return _(ntstatus_errors[i].error_string);
629 }
630 }
631 return NULL;
632 }
633
634 /* --- authentication management functions --- */
635
636 /* Attempt a conversation */
637
638 static int converse(const pam_handle_t *pamh,
639 int nargs,
640 struct pam_message **message,
641 struct pam_response **response)
642 {
643 int retval;
644 struct pam_conv *conv;
645
646 retval = _pam_get_item(pamh, PAM_CONV, &conv);
647 if (retval == PAM_SUCCESS) {
648 retval = conv->conv(nargs,
649 (const struct pam_message **)message,
650 response, conv->appdata_ptr);
651 }
652
653 return retval; /* propagate error status */
654 }
655
656
657 static int _make_remark(struct pwb_context *ctx,
658 int type,
659 const char *text)
660 {
661 int retval = PAM_SUCCESS;
662
663 struct pam_message *pmsg[1], msg[1];
664 struct pam_response *resp;
665
666 if (ctx->flags & WINBIND_SILENT) {
667 return PAM_SUCCESS;
668 }
669
670 pmsg[0] = &msg[0];
671 msg[0].msg = discard_const_p(char, text);
672 msg[0].msg_style = type;
673
674 resp = NULL;
675 retval = converse(ctx->pamh, 1, pmsg, &resp);
676
677 if (resp) {
678 _pam_drop_reply(resp, 1);
679 }
680 return retval;
681 }
682
683 static int _make_remark_v(struct pwb_context *ctx,
684 int type,
685 const char *format,
686 va_list args)
687 {
688 char *var;
689 int ret;
690
691 ret = vasprintf(&var, format, args);
692 if (ret < 0) {
693 _pam_log(ctx, LOG_ERR, "memory allocation failure");
694 return ret;
695 }
696
697 ret = _make_remark(ctx, type, var);
698 SAFE_FREE(var);
699 return ret;
700 }
701
702 static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
703 static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...)
704 {
705 int ret;
706 va_list args;
707
708 va_start(args, format);
709 ret = _make_remark_v(ctx, type, format, args);
710 va_end(args);
711 return ret;
712 }
713
714 static int pam_winbind_request_log(struct pwb_context *ctx,
715 int retval,
716 const char *user,
717 const char *fn)
718 {
719 switch (retval) {
720 case PAM_AUTH_ERR:
721 /* incorrect password */
722 _pam_log(ctx, LOG_WARNING, "user '%s' denied access "
723 "(incorrect password or invalid membership)", user);
724 return retval;
725 case PAM_ACCT_EXPIRED:
726 /* account expired */
727 _pam_log(ctx, LOG_WARNING, "user '%s' account expired",
728 user);
729 return retval;
730 case PAM_AUTHTOK_EXPIRED:
731 /* password expired */
732 _pam_log(ctx, LOG_WARNING, "user '%s' password expired",
733 user);
734 return retval;
735 case PAM_NEW_AUTHTOK_REQD:
736 /* new password required */
737 _pam_log(ctx, LOG_WARNING, "user '%s' new password "
738 "required", user);
739 return retval;
740 case PAM_USER_UNKNOWN:
741 /* the user does not exist */
742 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
743 user);
744 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
745 return PAM_IGNORE;
746 }
747 return retval;
748 case PAM_SUCCESS:
749 /* Otherwise, the authentication looked good */
750 if (strcmp(fn, "wbcLogonUser") == 0) {
751 _pam_log(ctx, LOG_NOTICE,
752 "user '%s' granted access", user);
753 } else {
754 _pam_log(ctx, LOG_NOTICE,
755 "user '%s' OK", user);
756 }
757 return retval;
758 default:
759 /* we don't know anything about this return value */
760 _pam_log(ctx, LOG_ERR,
761 "internal module error (retval = %s(%d), user = '%s')",
762 _pam_error_code_str(retval), retval, user);
763 return retval;
764 }
765 }
766
767 static int wbc_auth_error_to_pam_error(struct pwb_context *ctx,
768 struct wbcAuthErrorInfo *e,
769 wbcErr status,
770 const char *username,
771 const char *fn)
772 {
773 int ret = PAM_AUTH_ERR;
774
775 if (WBC_ERROR_IS_OK(status)) {
776 _pam_log_debug(ctx, LOG_DEBUG, "request %s succeeded",
777 fn);
778 ret = PAM_SUCCESS;
779 return pam_winbind_request_log(ctx, ret, username, fn);
780 }
781
782 if (e) {
783 if (e->pam_error != PAM_SUCCESS) {
784 _pam_log(ctx, LOG_ERR,
785 "request %s failed: %s, "
786 "PAM error: %s (%d), NTSTATUS: %s, "
787 "Error message was: %s",
788 fn,
789 wbcErrorString(status),
790 _pam_error_code_str(e->pam_error),
791 e->pam_error,
792 e->nt_string,
793 e->display_string);
794 ret = e->pam_error;
795 return pam_winbind_request_log(ctx, ret, username, fn);
796 }
797
798 _pam_log(ctx, LOG_ERR, "request %s failed, but PAM error 0!", fn);
799
800 ret = PAM_SERVICE_ERR;
801 return pam_winbind_request_log(ctx, ret, username, fn);
802 }
803
804 ret = wbc_error_to_pam_error(status);
805 return pam_winbind_request_log(ctx, ret, username, fn);
806 }
807
808 #if defined(HAVE_PAM_RADIO_TYPE)
809 static bool _pam_winbind_change_pwd(struct pwb_context *ctx)
810 {
811 struct pam_message msg, *pmsg;
812 struct pam_response *resp = NULL;
813 const char *prompt;
814 int ret;
815 bool retval = false;
816 prompt = _("Do you want to change your password now?");
817 pmsg = &msg;
818 msg.msg_style = PAM_RADIO_TYPE;
819 msg.msg = prompt;
820 ret = converse(ctx->pamh, 1, &pmsg, &resp);
821 if (resp == NULL) {
822 if (ret == PAM_SUCCESS) {
823 _pam_log(ctx, LOG_CRIT, "pam_winbind: system error!\n");
824 return false;
825 }
826 }
827 if (ret != PAM_SUCCESS) {
828 return false;
829 }
830 _pam_log(ctx, LOG_CRIT, "Received [%s] reply from application.\n", resp->resp);
831
832 if (strcasecmp(resp->resp, "yes") == 0) {
833 retval = true;
834 }
835
836 _pam_drop_reply(resp, 1);
837 return retval;
838 }
839 #else
840 static bool _pam_winbind_change_pwd(struct pwb_context *ctx)
841 {
842 return false;
843 }
844 #endif
845
846 /**
847 * send a password expiry message if required
848 *
849 * @param ctx PAM winbind context.
850 * @param next_change expected (calculated) next expiry date.
851 * @param already_expired pointer to a boolean to indicate if the password is
852 * already expired.
853 *
854 * @return boolean Returns true if message has been sent, false if not.
855 */
856
857 static bool _pam_send_password_expiry_message(struct pwb_context *ctx,
858 time_t next_change,
859 time_t now,
860 int warn_pwd_expire,
861 bool *already_expired,
862 bool *change_pwd)
863 {
864 int days = 0;
865 struct tm tm_now, tm_next_change;
866 bool retval = false;
867 int ret;
868
869 if (already_expired) {
870 *already_expired = false;
871 }
872
873 if (change_pwd) {
874 *change_pwd = false;
875 }
876
877 if (next_change <= now) {
878 PAM_WB_REMARK_DIRECT(ctx, "NT_STATUS_PASSWORD_EXPIRED");
879 if (already_expired) {
880 *already_expired = true;
881 }
882 return true;
883 }
884
885 if ((next_change < 0) ||
886 (next_change > now + warn_pwd_expire * SECONDS_PER_DAY)) {
887 return false;
888 }
889
890 if ((localtime_r(&now, &tm_now) == NULL) ||
891 (localtime_r(&next_change, &tm_next_change) == NULL)) {
892 return false;
893 }
894
895 days = (tm_next_change.tm_yday+tm_next_change.tm_year*365) -
896 (tm_now.tm_yday+tm_now.tm_year*365);
897
898 if (days == 0) {
899 ret = _make_remark(ctx, PAM_TEXT_INFO,
900 _("Your password expires today.\n"));
901
902 /*
903 * If change_pwd and already_expired is null.
904 * We are just sending a notification message.
905 * We don't expect any response in this case.
906 */
907
908 if (!change_pwd && !already_expired) {
909 return true;
910 }
911
912 /*
913 * successfully sent the warning message.
914 * Give the user a chance to change pwd.
915 */
916 if (ret == PAM_SUCCESS) {
917 if (change_pwd) {
918 retval = _pam_winbind_change_pwd(ctx);
919 if (retval) {
920 *change_pwd = true;
921 }
922 }
923 }
924 return true;
925 }
926
927 if (days > 0 && days < warn_pwd_expire) {
928
929 ret = _make_remark_format(ctx, PAM_TEXT_INFO,
930 _("Your password will expire in %d %s.\n"),
931 days, (days > 1) ? _("days"):_("day"));
932 /*
933 * If change_pwd and already_expired is null.
934 * We are just sending a notification message.
935 * We don't expect any response in this case.
936 */
937
938 if (!change_pwd && !already_expired) {
939 return true;
940 }
941
942 /*
943 * successfully sent the warning message.
944 * Give the user a chance to change pwd.
945 */
946 if (ret == PAM_SUCCESS) {
947 if (change_pwd) {
948 retval = _pam_winbind_change_pwd(ctx);
949 if (retval) {
950 *change_pwd = true;
951 }
952 }
953 }
954 return true;
955 }
956
957 return false;
958 }
959
960 /**
961 * Send a warning if the password expires in the near future
962 *
963 * @param ctx PAM winbind context.
964 * @param response The full authentication response structure.
965 * @param already_expired boolean, is the pwd already expired?
966 *
967 * @return void.
968 */
969
970 static void _pam_warn_password_expiry(struct pwb_context *ctx,
971 const struct wbcAuthUserInfo *info,
972 const struct wbcUserPasswordPolicyInfo *policy,
973 int warn_pwd_expire,
974 bool *already_expired,
975 bool *change_pwd)
976 {
977 time_t now = time(NULL);
978 time_t next_change = 0;
979
980 if (!info || !policy) {
981 return;
982 }
983
984 if (already_expired) {
985 *already_expired = false;
986 }
987
988 if (change_pwd) {
989 *change_pwd = false;
990 }
991
992 /* accounts with WBC_ACB_PWNOEXP set never receive a warning */
993 if (info->acct_flags & WBC_ACB_PWNOEXP) {
994 return;
995 }
996
997 /* no point in sending a warning if this is a grace logon */
998 if (PAM_WB_GRACE_LOGON(info->user_flags)) {
999 return;
1000 }
1001
1002 /* check if the info3 must change timestamp has been set */
1003 next_change = info->pass_must_change_time;
1004
1005 if (_pam_send_password_expiry_message(ctx, next_change, now,
1006 warn_pwd_expire,
1007 already_expired,
1008 change_pwd)) {
1009 return;
1010 }
1011
1012 /* now check for the global password policy */
1013 /* good catch from Ralf Haferkamp: an expiry of "never" is translated
1014 * to -1 */
1015 if ((policy->expire == (int64_t)-1) ||
1016 (policy->expire == 0)) {
1017 return;
1018 }
1019
1020 next_change = info->pass_last_set_time + policy->expire;
1021
1022 if (_pam_send_password_expiry_message(ctx, next_change, now,
1023 warn_pwd_expire,
1024 already_expired,
1025 change_pwd)) {
1026 return;
1027 }
1028
1029 /* no warning sent */
1030 }
1031
1032 #define IS_SID_STRING(name) (strncmp("S-", name, 2) == 0)
1033
1034 /**
1035 * Append a string, making sure not to overflow and to always return a
1036 * NULL-terminated string.
1037 *
1038 * @param dest Destination string buffer (must already be NULL-terminated).
1039 * @param src Source string buffer.
1040 * @param dest_buffer_size Size of dest buffer in bytes.
1041 *
1042 * @return false if dest buffer is not big enough (no bytes copied), true on
1043 * success.
1044 */
1045
1046 static bool safe_append_string(char *dest,
1047 const char *src,
1048 int dest_buffer_size)
1049 {
1050 int dest_length = strlen(dest);
1051 int src_length = strlen(src);
1052
1053 if (dest_length + src_length + 1 > dest_buffer_size) {
1054 return false;
1055 }
1056
1057 memcpy(dest + dest_length, src, src_length + 1);
1058 return true;
1059 }
1060
1061 /**
1062 * Convert a names into a SID string, appending it to a buffer.
1063 *
1064 * @param ctx PAM winbind context.
1065 * @param user User in PAM request.
1066 * @param name Name to convert.
1067 * @param sid_list_buffer Where to append the string sid.
1068 * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1069 *
1070 * @return false on failure, true on success.
1071 */
1072 static bool winbind_name_to_sid_string(struct pwb_context *ctx,
1073 const char *user,
1074 const char *name,
1075 char *sid_list_buffer,
1076 int sid_list_buffer_size)
1077 {
1078 char sid_string[WBC_SID_STRING_BUFLEN];
1079
1080 /* lookup name? */
1081 if (IS_SID_STRING(name)) {
1082 strlcpy(sid_string, name, sizeof(sid_string));
1083 } else {
1084 wbcErr wbc_status;
1085 struct wbcDomainSid sid;
1086 enum wbcSidType type;
1087
1088 _pam_log_debug(ctx, LOG_DEBUG,
1089 "no sid given, looking up: %s\n", name);
1090
1091 wbc_status = wbcLookupName("", name, &sid, &type);
1092 if (!WBC_ERROR_IS_OK(wbc_status)) {
1093 _pam_log(ctx, LOG_INFO,
1094 "could not lookup name: %s\n", name);
1095 return false;
1096 }
1097
1098 wbcSidToStringBuf(&sid, sid_string, sizeof(sid_string));
1099 }
1100
1101 if (!safe_append_string(sid_list_buffer, sid_string,
1102 sid_list_buffer_size)) {
1103 return false;
1104 }
1105 return true;
1106 }
1107
1108 /**
1109 * Convert a list of names into a list of sids.
1110 *
1111 * @param ctx PAM winbind context.
1112 * @param user User in PAM request.
1113 * @param name_list List of names or string sids, separated by commas.
1114 * @param sid_list_buffer Where to put the list of string sids.
1115 * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1116 *
1117 * @return false on failure, true on success.
1118 */
1119 static bool winbind_name_list_to_sid_string_list(struct pwb_context *ctx,
1120 const char *user,
1121 const char *name_list,
1122 char *sid_list_buffer,
1123 int sid_list_buffer_size)
1124 {
1125 bool result = false;
1126 char *current_name = NULL;
1127 const char *search_location;
1128 const char *comma;
1129 int len;
1130
1131 if (sid_list_buffer_size > 0) {
1132 sid_list_buffer[0] = 0;
1133 }
1134
1135 search_location = name_list;
1136 while ((comma = strchr(search_location, ',')) != NULL) {
1137 current_name = strndup(search_location,
1138 comma - search_location);
1139 if (NULL == current_name) {
1140 goto out;
1141 }
1142
1143 if (!winbind_name_to_sid_string(ctx, user,
1144 current_name,
1145 sid_list_buffer,
1146 sid_list_buffer_size)) {
1147 /*
1148 * If one group name failed, we must not fail
1149 * the authentication totally, continue with
1150 * the following group names. If user belongs to
1151 * one of the valid groups, we must allow it
1152 * login. -- BoYang
1153 */
1154
1155 _pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
1156 "check if group %s is valid group.", current_name,
1157 current_name);
1158 _make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
1159 "to sid, please contact your administrator to see "
1160 "if group %s is valid."), current_name, current_name);
1161 SAFE_FREE(current_name);
1162 search_location = comma + 1;
1163 continue;
1164 }
1165
1166 SAFE_FREE(current_name);
1167
1168 if (!safe_append_string(sid_list_buffer, ",",
1169 sid_list_buffer_size)) {
1170 goto out;
1171 }
1172
1173 search_location = comma + 1;
1174 }
1175
1176 if (!winbind_name_to_sid_string(ctx, user, search_location,
1177 sid_list_buffer,
1178 sid_list_buffer_size)) {
1179 _pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
1180 "check if group %s is valid group.", search_location,
1181 search_location);
1182 _make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
1183 "to sid, please contact your administrator to see "
1184 "if group %s is valid."), search_location, search_location);
1185 /*
1186 * The lookup of the last name failed..
1187 * It results in require_member_of_sid ends with ','
1188 * It is malformated parameter here, overwrite the last ','.
1189 */
1190 len = strlen(sid_list_buffer);
1191 if ((len != 0) && (sid_list_buffer[len - 1] == ',')) {
1192 sid_list_buffer[len - 1] = '\0';
1193 }
1194 }
1195
1196 result = true;
1197
1198 out:
1199 SAFE_FREE(current_name);
1200 return result;
1201 }
1202
1203 /**
1204 * put krb5ccname variable into environment
1205 *
1206 * @param ctx PAM winbind context.
1207 * @param krb5ccname env variable retrieved from winbindd.
1208 *
1209 * @return void.
1210 */
1211
1212 static void _pam_setup_krb5_env(struct pwb_context *ctx,
1213 struct wbcLogonUserInfo *info)
1214 {
1215 char var[PATH_MAX];
1216 int ret;
1217 uint32_t i;
1218 const char *krb5ccname = NULL;
1219
1220 if (off(ctx->ctrl, WINBIND_KRB5_AUTH)) {
1221 return;
1222 }
1223
1224 if (!info) {
1225 return;
1226 }
1227
1228 for (i=0; i < info->num_blobs; i++) {
1229 if (strcasecmp(info->blobs[i].name, "krb5ccname") == 0) {
1230 krb5ccname = (const char *)info->blobs[i].blob.data;
1231 break;
1232 }
1233 }
1234
1235 if (!krb5ccname || (strlen(krb5ccname) == 0)) {
1236 return;
1237 }
1238
1239 _pam_log_debug(ctx, LOG_DEBUG,
1240 "request returned KRB5CCNAME: %s", krb5ccname);
1241
1242 if (snprintf(var, sizeof(var), "KRB5CCNAME=%s", krb5ccname) == -1) {
1243 return;
1244 }
1245
1246 ret = pam_putenv(ctx->pamh, var);
1247 if (ret) {
1248 _pam_log(ctx, LOG_ERR,
1249 "failed to set KRB5CCNAME to %s: %s",
1250 var, pam_strerror(ctx->pamh, ret));
1251 }
1252 }
1253
1254 /**
1255 * Copy unix username if available (further processed in PAM).
1256 *
1257 * @param ctx PAM winbind context
1258 * @param user_ret A pointer that holds a pointer to a string
1259 * @param unix_username A username
1260 *
1261 * @return void.
1262 */
1263
1264 static void _pam_setup_unix_username(struct pwb_context *ctx,
1265 char **user_ret,
1266 struct wbcLogonUserInfo *info)
1267 {
1268 const char *unix_username = NULL;
1269 uint32_t i;
1270
1271 if (!user_ret || !info) {
1272 return;
1273 }
1274
1275 for (i=0; i < info->num_blobs; i++) {
1276 if (strcasecmp(info->blobs[i].name, "unix_username") == 0) {
1277 unix_username = (const char *)info->blobs[i].blob.data;
1278 break;
1279 }
1280 }
1281
1282 if (!unix_username || !unix_username[0]) {
1283 return;
1284 }
1285
1286 *user_ret = strdup(unix_username);
1287 }
1288
1289 /**
1290 * Set string into the PAM stack.
1291 *
1292 * @param ctx PAM winbind context.
1293 * @param data_name Key name for pam_set_data.
1294 * @param value String value.
1295 *
1296 * @return void.
1297 */
1298
1299 static void _pam_set_data_string(struct pwb_context *ctx,
1300 const char *data_name,
1301 const char *value)
1302 {
1303 int ret;
1304
1305 if (!data_name || !value || (strlen(data_name) == 0) ||
1306 (strlen(value) == 0)) {
1307 return;
1308 }
1309
1310 ret = pam_set_data(ctx->pamh, data_name, talloc_strdup(NULL, value),
1311 _pam_winbind_cleanup_func);
1312 if (ret) {
1313 _pam_log_debug(ctx, LOG_DEBUG,
1314 "Could not set data %s: %s\n",
1315 data_name, pam_strerror(ctx->pamh, ret));
1316 }
1317 }
1318
1319 /**
1320 * Set info3 strings into the PAM stack.
1321 *
1322 * @param ctx PAM winbind context.
1323 * @param data_name Key name for pam_set_data.
1324 * @param value String value.
1325 *
1326 * @return void.
1327 */
1328
1329 static void _pam_set_data_info3(struct pwb_context *ctx,
1330 const struct wbcAuthUserInfo *info)
1331 {
1332 _pam_set_data_string(ctx, PAM_WINBIND_HOMEDIR,
1333 info->home_directory);
1334 _pam_set_data_string(ctx, PAM_WINBIND_LOGONSCRIPT,
1335 info->logon_script);
1336 _pam_set_data_string(ctx, PAM_WINBIND_LOGONSERVER,
1337 info->logon_server);
1338 _pam_set_data_string(ctx, PAM_WINBIND_PROFILEPATH,
1339 info->profile_path);
1340 }
1341
1342 /**
1343 * Free info3 strings in the PAM stack.
1344 *
1345 * @param pamh PAM handle
1346 *
1347 * @return void.
1348 */
1349
1350 static void _pam_free_data_info3(pam_handle_t *pamh)
1351 {
1352 pam_set_data(pamh, PAM_WINBIND_HOMEDIR, NULL, NULL);
1353 pam_set_data(pamh, PAM_WINBIND_LOGONSCRIPT, NULL, NULL);
1354 pam_set_data(pamh, PAM_WINBIND_LOGONSERVER, NULL, NULL);
1355 pam_set_data(pamh, PAM_WINBIND_PROFILEPATH, NULL, NULL);
1356 }
1357
1358 /**
1359 * Send PAM_ERROR_MSG for cached or grace logons.
1360 *
1361 * @param ctx PAM winbind context.
1362 * @param username User in PAM request.
1363 * @param info3_user_flgs Info3 flags containing logon type bits.
1364 *
1365 * @return void.
1366 */
1367
1368 static void _pam_warn_logon_type(struct pwb_context *ctx,
1369 const char *username,
1370 uint32_t info3_user_flgs)
1371 {
1372 /* inform about logon type */
1373 if (PAM_WB_GRACE_LOGON(info3_user_flgs)) {
1374
1375 _make_remark(ctx, PAM_ERROR_MSG,
1376 _("Grace login. "
1377 "Please change your password as soon you're "
1378 "online again"));
1379 _pam_log_debug(ctx, LOG_DEBUG,
1380 "User %s logged on using grace logon\n",
1381 username);
1382
1383 } else if (PAM_WB_CACHED_LOGON(info3_user_flgs)) {
1384
1385 _make_remark(ctx, PAM_ERROR_MSG,
1386 _("Domain Controller unreachable, "
1387 "using cached credentials instead. "
1388 "Network resources may be unavailable"));
1389 _pam_log_debug(ctx, LOG_DEBUG,
1390 "User %s logged on using cached credentials\n",
1391 username);
1392 }
1393 }
1394
1395 /**
1396 * Send PAM_ERROR_MSG for krb5 errors.
1397 *
1398 * @param ctx PAM winbind context.
1399 * @param username User in PAM request.
1400 * @param info3_user_flgs Info3 flags containing logon type bits.
1401 *
1402 * @return void.
1403 */
1404
1405 static void _pam_warn_krb5_failure(struct pwb_context *ctx,
1406 const char *username,
1407 uint32_t info3_user_flgs)
1408 {
1409 if (PAM_WB_KRB5_CLOCK_SKEW(info3_user_flgs)) {
1410 _make_remark(ctx, PAM_ERROR_MSG,
1411 _("Failed to establish your Kerberos Ticket cache "
1412 "due time differences\n"
1413 "with the domain controller. "
1414 "Please verify the system time.\n"));
1415 _pam_log_debug(ctx, LOG_DEBUG,
1416 "User %s: Clock skew when getting Krb5 TGT\n",
1417 username);
1418 }
1419 }
1420
1421 static bool _pam_check_remark_auth_err(struct pwb_context *ctx,
1422 const struct wbcAuthErrorInfo *e,
1423 const char *nt_status_string,
1424 int *pam_err)
1425 {
1426 const char *ntstatus = NULL;
1427 const char *error_string = NULL;
1428
1429 if (!e || !pam_err) {
1430 return false;
1431 }
1432
1433 ntstatus = e->nt_string;
1434 if (!ntstatus) {
1435 return false;
1436 }
1437
1438 if (strcasecmp(ntstatus, nt_status_string) == 0) {
1439
1440 error_string = _get_ntstatus_error_string(nt_status_string);
1441 if (error_string) {
1442 _make_remark(ctx, PAM_ERROR_MSG, error_string);
1443 *pam_err = e->pam_error;
1444 return true;
1445 }
1446
1447 if (e->display_string) {
1448 _make_remark(ctx, PAM_ERROR_MSG, _(e->display_string));
1449 *pam_err = e->pam_error;
1450 return true;
1451 }
1452
1453 _make_remark(ctx, PAM_ERROR_MSG, nt_status_string);
1454 *pam_err = e->pam_error;
1455
1456 return true;
1457 }
1458
1459 return false;
1460 };
1461
1462 /**
1463 * Compose Password Restriction String for a PAM_ERROR_MSG conversation.
1464 *
1465 * @param i The wbcUserPasswordPolicyInfo struct.
1466 *
1467 * @return string (caller needs to talloc_free).
1468 */
1469
1470 static char *_pam_compose_pwd_restriction_string(struct pwb_context *ctx,
1471 struct wbcUserPasswordPolicyInfo *i)
1472 {
1473 char *str = NULL;
1474
1475 if (!i) {
1476 goto failed;
1477 }
1478
1479 str = talloc_asprintf(ctx, _("Your password "));
1480 if (!str) {
1481 goto failed;
1482 }
1483
1484 if (i->min_length_password > 0) {
1485 str = talloc_asprintf_append(str,
1486 _("must be at least %d characters; "),
1487 i->min_length_password);
1488 if (!str) {
1489 goto failed;
1490 }
1491 }
1492
1493 if (i->password_history > 0) {
1494 str = talloc_asprintf_append(str,
1495 _("cannot repeat any of your previous %d "
1496 "passwords; "),
1497 i->password_history);
1498 if (!str) {
1499 goto failed;
1500 }
1501 }
1502
1503 if (i->password_properties & WBC_DOMAIN_PASSWORD_COMPLEX) {
1504 str = talloc_asprintf_append(str,
1505 _("must contain capitals, numerals "
1506 "or punctuation; "
1507 "and cannot contain your account "
1508 "or full name; "));
1509 if (!str) {
1510 goto failed;
1511 }
1512 }
1513
1514 str = talloc_asprintf_append(str,
1515 _("Please type a different password. "
1516 "Type a password which meets these requirements in "
1517 "both text boxes."));
1518 if (!str) {
1519 goto failed;
1520 }
1521
1522 return str;
1523
1524 failed:
1525 TALLOC_FREE(str);
1526 return NULL;
1527 }
1528
1529 static int _pam_create_homedir(struct pwb_context *ctx,
1530 const char *dirname,
1531 mode_t mode)
1532 {
1533 struct stat sbuf;
1534
1535 if (stat(dirname, &sbuf) == 0) {
1536 return PAM_SUCCESS;
1537 }
1538
1539 if (mkdir(dirname, mode) != 0) {
1540
1541 _make_remark_format(ctx, PAM_TEXT_INFO,
1542 _("Creating directory: %s failed: %s"),
1543 dirname, strerror(errno));
1544 _pam_log(ctx, LOG_ERR, "could not create dir: %s (%s)",
1545 dirname, strerror(errno));
1546 return PAM_PERM_DENIED;
1547 }
1548
1549 return PAM_SUCCESS;
1550 }
1551
1552 static int _pam_chown_homedir(struct pwb_context *ctx,
1553 const char *dirname,
1554 uid_t uid,
1555 gid_t gid)
1556 {
1557 if (chown(dirname, uid, gid) != 0) {
1558 _pam_log(ctx, LOG_ERR, "failed to chown user homedir: %s (%s)",
1559 dirname, strerror(errno));
1560 return PAM_PERM_DENIED;
1561 }
1562
1563 return PAM_SUCCESS;
1564 }
1565
1566 static int _pam_mkhomedir(struct pwb_context *ctx)
1567 {
1568 struct passwd *pwd = NULL;
1569 char *token = NULL;
1570 char *create_dir = NULL;
1571 char *user_dir = NULL;
1572 int ret;
1573 const char *username;
1574 mode_t mode = 0700;
1575 char *safe_ptr = NULL;
1576 char *p = NULL;
1577
1578 /* Get the username */
1579 ret = pam_get_user(ctx->pamh, &username, NULL);
1580 if ((ret != PAM_SUCCESS) || (!username)) {
1581 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1582 return PAM_SERVICE_ERR;
1583 }
1584
1585 pwd = getpwnam(username);
1586 if (pwd == NULL) {
1587 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1588 return PAM_USER_UNKNOWN;
1589 }
1590 _pam_log_debug(ctx, LOG_DEBUG, "homedir is: %s", pwd->pw_dir);
1591
1592 ret = _pam_create_homedir(ctx, pwd->pw_dir, 0700);
1593 if (ret == PAM_SUCCESS) {
1594 ret = _pam_chown_homedir(ctx, pwd->pw_dir,
1595 pwd->pw_uid,
1596 pwd->pw_gid);
1597 }
1598
1599 if (ret == PAM_SUCCESS) {
1600 return ret;
1601 }
1602
1603 /* maybe we need to create parent dirs */
1604 create_dir = talloc_strdup(ctx, "/");
1605 if (!create_dir) {
1606 return PAM_BUF_ERR;
1607 }
1608
1609 /* find final directory */
1610 user_dir = strrchr(pwd->pw_dir, '/');
1611 if (!user_dir) {
1612 return PAM_BUF_ERR;
1613 }
1614 user_dir++;
1615
1616 _pam_log(ctx, LOG_DEBUG, "final directory: %s", user_dir);
1617
1618 p = pwd->pw_dir;
1619
1620 while ((token = strtok_r(p, "/", &safe_ptr)) != NULL) {
1621
1622 mode = 0755;
1623
1624 p = NULL;
1625
1626 _pam_log_debug(ctx, LOG_DEBUG, "token is %s", token);
1627
1628 create_dir = talloc_asprintf_append(create_dir, "%s/", token);
1629 if (!create_dir) {
1630 return PAM_BUF_ERR;
1631 }
1632 _pam_log_debug(ctx, LOG_DEBUG, "current_dir is %s", create_dir);
1633
1634 if (strcmp(token, user_dir) == 0) {
1635 _pam_log_debug(ctx, LOG_DEBUG, "assuming last directory: %s", token);
1636 mode = 0700;
1637 }
1638
1639 ret = _pam_create_homedir(ctx, create_dir, mode);
1640 if (ret) {
1641 return ret;
1642 }
1643 }
1644
1645 return _pam_chown_homedir(ctx, create_dir,
1646 pwd->pw_uid,
1647 pwd->pw_gid);
1648 }
1649
1650 /* talk to winbindd */
1651 static int winbind_auth_request(struct pwb_context *ctx,
1652 const char *user,
1653 const char *pass,
1654 const char *member,
1655 const char *cctype,
1656 const int warn_pwd_expire,
1657 struct wbcAuthErrorInfo **p_error,
1658 struct wbcLogonUserInfo **p_info,
1659 struct wbcUserPasswordPolicyInfo **p_policy,
1660 time_t *pwd_last_set,
1661 char **user_ret)
1662 {
1663 wbcErr wbc_status;
1664
1665 struct wbcLogonUserParams logon;
1666 char membership_of[1024];
1667 uid_t user_uid = -1;
1668 uint32_t flags = WBFLAG_PAM_INFO3_TEXT |
1669 WBFLAG_PAM_GET_PWD_POLICY;
1670
1671 struct wbcLogonUserInfo *info = NULL;
1672 struct wbcAuthUserInfo *user_info = NULL;
1673 struct wbcAuthErrorInfo *error = NULL;
1674 struct wbcUserPasswordPolicyInfo *policy = NULL;
1675
1676 int ret = PAM_AUTH_ERR;
1677 int i;
1678 const char *codes[] = {
1679 "NT_STATUS_PASSWORD_EXPIRED",
1680 "NT_STATUS_PASSWORD_MUST_CHANGE",
1681 "NT_STATUS_INVALID_WORKSTATION",
1682 "NT_STATUS_INVALID_LOGON_HOURS",
1683 "NT_STATUS_ACCOUNT_EXPIRED",
1684 "NT_STATUS_ACCOUNT_DISABLED",
1685 "NT_STATUS_ACCOUNT_LOCKED_OUT",
1686 "NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
1687 "NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
1688 "NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
1689 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1690 "NT_STATUS_NO_LOGON_SERVERS",
1691 "NT_STATUS_WRONG_PASSWORD",
1692 "NT_STATUS_ACCESS_DENIED"
1693 };
1694
1695 if (pwd_last_set) {
1696 *pwd_last_set = 0;
1697 }
1698
1699 /* Krb5 auth always has to go against the KDC of the user's realm */
1700
1701 if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1702 flags |= WBFLAG_PAM_CONTACT_TRUSTDOM;
1703 }
1704
1705 if (ctx->ctrl & (WINBIND_KRB5_AUTH|WINBIND_CACHED_LOGIN)) {
1706 struct passwd *pwd = NULL;
1707
1708 pwd = getpwnam(user);
1709 if (pwd == NULL) {
1710 return PAM_USER_UNKNOWN;
1711 }
1712 user_uid = pwd->pw_uid;
1713 }
1714
1715 if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1716
1717 _pam_log_debug(ctx, LOG_DEBUG,
1718 "enabling krb5 login flag\n");
1719
1720 flags |= WBFLAG_PAM_KRB5 |
1721 WBFLAG_PAM_FALLBACK_AFTER_KRB5;
1722 }
1723
1724 if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1725 _pam_log_debug(ctx, LOG_DEBUG,
1726 "enabling cached login flag\n");
1727 flags |= WBFLAG_PAM_CACHED_LOGIN;
1728 }
1729
1730 if (user_ret) {
1731 *user_ret = NULL;
1732 flags |= WBFLAG_PAM_UNIX_NAME;
1733 }
1734
1735 if (cctype != NULL) {
1736 _pam_log_debug(ctx, LOG_DEBUG,
1737 "enabling request for a %s krb5 ccache\n",
1738 cctype);
1739 }
1740
1741 if (member != NULL) {
1742
1743 ZERO_STRUCT(membership_of);
1744
1745 if (!winbind_name_list_to_sid_string_list(ctx, user, member,
1746 membership_of,
1747 sizeof(membership_of))) {
1748 _pam_log_debug(ctx, LOG_ERR,
1749 "failed to serialize membership of sid "
1750 "\"%s\"\n", member);
1751 return PAM_AUTH_ERR;
1752 }
1753 }
1754
1755 ZERO_STRUCT(logon);
1756
1757 logon.username = user;
1758 logon.password = pass;
1759
1760 if (cctype) {
1761 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1762 &logon.blobs,
1763 "krb5_cc_type",
1764 0,
1765 discard_const_p(uint8_t, cctype),
1766 strlen(cctype)+1);
1767 if (!WBC_ERROR_IS_OK(wbc_status)) {
1768 goto done;
1769 }
1770 }
1771
1772 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1773 &logon.blobs,
1774 "flags",
1775 0,
1776 (uint8_t *)&flags,
1777 sizeof(flags));
1778 if (!WBC_ERROR_IS_OK(wbc_status)) {
1779 goto done;
1780 }
1781
1782 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1783 &logon.blobs,
1784 "user_uid",
1785 0,
1786 (uint8_t *)&user_uid,
1787 sizeof(user_uid));
1788 if (!WBC_ERROR_IS_OK(wbc_status)) {
1789 goto done;
1790 }
1791
1792 if (member) {
1793 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1794 &logon.blobs,
1795 "membership_of",
1796 0,
1797 (uint8_t *)membership_of,
1798 sizeof(membership_of));
1799 if (!WBC_ERROR_IS_OK(wbc_status)) {
1800 goto done;
1801 }
1802 }
1803
1804 wbc_status = wbcLogonUser(&logon, &info, &error, &policy);
1805 ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1806 user, "wbcLogonUser");
1807 wbcFreeMemory(logon.blobs);
1808 logon.blobs = NULL;
1809
1810 if (info && info->info) {
1811 user_info = info->info;
1812 }
1813
1814 if (pwd_last_set && user_info) {
1815 *pwd_last_set = user_info->pass_last_set_time;
1816 }
1817
1818 if (p_info && info) {
1819 *p_info = info;
1820 }
1821
1822 if (p_policy && policy) {
1823 *p_policy = policy;
1824 }
1825
1826 if (p_error && error) {
1827 /* We want to process the error in the caller. */
1828 *p_error = error;
1829 return ret;
1830 }
1831
1832 for (i=0; i<ARRAY_SIZE(codes); i++) {
1833 int _ret = ret;
1834 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1835 ret = _ret;
1836 goto done;
1837 }
1838 }
1839
1840 if ((ret == PAM_SUCCESS) && user_info && policy && info) {
1841
1842 bool already_expired = false;
1843 bool change_pwd = false;
1844
1845 /* warn a user if the password is about to expire soon */
1846 _pam_warn_password_expiry(ctx, user_info, policy,
1847 warn_pwd_expire,
1848 &already_expired,
1849 &change_pwd);
1850
1851 if (already_expired == true) {
1852
1853 SMB_TIME_T last_set = user_info->pass_last_set_time;
1854
1855 _pam_log_debug(ctx, LOG_DEBUG,
1856 "Password has expired "
1857 "(Password was last set: %lld, "
1858 "the policy says it should expire here "
1859 "%lld (now it's: %ld))\n",
1860 (long long int)last_set,
1861 (long long int)last_set +
1862 policy->expire,
1863 (long)time(NULL));
1864
1865 return PAM_AUTHTOK_EXPIRED;
1866 }
1867
1868 if (change_pwd) {
1869 ret = PAM_NEW_AUTHTOK_REQD;
1870 goto done;
1871 }
1872
1873 /* inform about logon type */
1874 _pam_warn_logon_type(ctx, user, user_info->user_flags);
1875
1876 /* inform about krb5 failures */
1877 _pam_warn_krb5_failure(ctx, user, user_info->user_flags);
1878
1879 /* set some info3 info for other modules in the stack */
1880 _pam_set_data_info3(ctx, user_info);
1881
1882 /* put krb5ccname into env */
1883 _pam_setup_krb5_env(ctx, info);
1884
1885 /* If winbindd returned a username, return the pointer to it
1886 * here. */
1887 _pam_setup_unix_username(ctx, user_ret, info);
1888 }
1889
1890 done:
1891 wbcFreeMemory(logon.blobs);
1892 if (info && info->blobs && !p_info) {
1893 wbcFreeMemory(info->blobs);
1894 }
1895 if (error && !p_error) {
1896 wbcFreeMemory(error);
1897 }
1898 if (info && !p_info) {
1899 wbcFreeMemory(info);
1900 }
1901 if (policy && !p_policy) {
1902 wbcFreeMemory(policy);
1903 }
1904
1905 return ret;
1906 }
1907
1908 /* talk to winbindd */
1909 static int winbind_chauthtok_request(struct pwb_context *ctx,
1910 const char *user,
1911 const char *oldpass,
1912 const char *newpass,
1913 time_t pwd_last_set)
1914 {
1915 wbcErr wbc_status;
1916 struct wbcChangePasswordParams params;
1917 struct wbcAuthErrorInfo *error = NULL;
1918 struct wbcUserPasswordPolicyInfo *policy = NULL;
1919 enum wbcPasswordChangeRejectReason reject_reason = -1;
1920 uint32_t flags = 0;
1921
1922 int i;
1923 const char *codes[] = {
1924 "NT_STATUS_BACKUP_CONTROLLER",
1925 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1926 "NT_STATUS_NO_LOGON_SERVERS",
1927 "NT_STATUS_ACCESS_DENIED",
1928 "NT_STATUS_PWD_TOO_SHORT", /* TODO: tell the min pwd length ? */
1929 "NT_STATUS_PWD_TOO_RECENT", /* TODO: tell the minage ? */
1930 "NT_STATUS_PWD_HISTORY_CONFLICT" /* TODO: tell the history length ? */
1931 };
1932 int ret = PAM_AUTH_ERR;
1933
1934 ZERO_STRUCT(params);
1935
1936 if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1937 flags |= WBFLAG_PAM_KRB5 |
1938 WBFLAG_PAM_CONTACT_TRUSTDOM;
1939 }
1940
1941 if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1942 flags |= WBFLAG_PAM_CACHED_LOGIN;
1943 }
1944
1945 params.account_name = user;
1946 params.level = WBC_AUTH_USER_LEVEL_PLAIN;
1947 params.old_password.plaintext = oldpass;
1948 params.new_password.plaintext = newpass;
1949 params.flags = flags;
1950
1951 wbc_status = wbcChangeUserPasswordEx(&params, &error, &reject_reason, &policy);
1952 ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1953 user, "wbcChangeUserPasswordEx");
1954
1955 if (WBC_ERROR_IS_OK(wbc_status)) {
1956 _pam_log(ctx, LOG_NOTICE,
1957 "user '%s' password changed", user);
1958 return PAM_SUCCESS;
1959 }
1960
1961 if (!error) {
1962 wbcFreeMemory(policy);
1963 return ret;
1964 }
1965
1966 for (i=0; i<ARRAY_SIZE(codes); i++) {
1967 int _ret = ret;
1968 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1969 ret = _ret;
1970 goto done;
1971 }
1972 }
1973
1974 if (!strcasecmp(error->nt_string,
1975 "NT_STATUS_PASSWORD_RESTRICTION")) {
1976
1977 char *pwd_restriction_string = NULL;
1978 SMB_TIME_T min_pwd_age = 0;
1979
1980 if (policy) {
1981 min_pwd_age = policy->min_passwordage;
1982 }
1983
1984 /* FIXME: avoid to send multiple PAM messages after another */
1985 switch (reject_reason) {
1986 case -1:
1987 break;
1988 case WBC_PWD_CHANGE_NO_ERROR:
1989 if ((min_pwd_age > 0) &&
1990 (pwd_last_set + min_pwd_age > time(NULL))) {
1991 PAM_WB_REMARK_DIRECT(ctx,
1992 "NT_STATUS_PWD_TOO_RECENT");
1993 }
1994 break;
1995 case WBC_PWD_CHANGE_PASSWORD_TOO_SHORT:
1996 PAM_WB_REMARK_DIRECT(ctx,
1997 "NT_STATUS_PWD_TOO_SHORT");
1998 break;
1999 case WBC_PWD_CHANGE_PWD_IN_HISTORY:
2000 PAM_WB_REMARK_DIRECT(ctx,
2001 "NT_STATUS_PWD_HISTORY_CONFLICT");
2002 break;
2003 case WBC_PWD_CHANGE_NOT_COMPLEX:
2004 _make_remark(ctx, PAM_ERROR_MSG,
2005 _("Password does not meet "
2006 "complexity requirements"));
2007 break;
2008 default:
2009 _pam_log_debug(ctx, LOG_DEBUG,
2010 "unknown password change "
2011 "reject reason: %d",
2012 reject_reason);
2013 break;
2014 }
2015
2016 pwd_restriction_string =
2017 _pam_compose_pwd_restriction_string(ctx, policy);
2018 if (pwd_restriction_string) {
2019 _make_remark(ctx, PAM_ERROR_MSG,
2020 pwd_restriction_string);
2021 TALLOC_FREE(pwd_restriction_string);
2022 }
2023 }
2024 done:
2025 wbcFreeMemory(error);
2026 wbcFreeMemory(policy);
2027
2028 return ret;
2029 }
2030
2031 /*
2032 * Checks if a user has an account
2033 *
2034 * return values:
2035 * 1 = User not found
2036 * 0 = OK
2037 * -1 = System error
2038 */
2039 static int valid_user(struct pwb_context *ctx,
2040 const char *user)
2041 {
2042 /* check not only if the user is available over NSS calls, also make
2043 * sure it's really a winbind user, this is important when stacking PAM
2044 * modules in the 'account' or 'password' facility. */
2045
2046 wbcErr wbc_status;
2047 struct passwd *pwd = NULL;
2048 struct passwd *wb_pwd = NULL;
2049
2050 pwd = getpwnam(user);
2051 if (pwd == NULL) {
2052 return 1;
2053 }
2054
2055 wbc_status = wbcGetpwnam(user, &wb_pwd);
2056 wbcFreeMemory(wb_pwd);
2057 if (!WBC_ERROR_IS_OK(wbc_status)) {
2058 _pam_log(ctx, LOG_DEBUG, "valid_user: wbcGetpwnam gave %s\n",
2059 wbcErrorString(wbc_status));
2060 }
2061
2062 switch (wbc_status) {
2063 case WBC_ERR_UNKNOWN_USER:
2064 return 1;
2065 case WBC_ERR_SUCCESS:
2066 return 0;
2067 default:
2068 break;
2069 }
2070 return -1;
2071 }
2072
2073 static char *_pam_delete(register char *xx)
2074 {
2075 _pam_overwrite(xx);
2076 _pam_drop(xx);
2077 return NULL;
2078 }
2079
2080 /*
2081 * obtain a password from the user
2082 */
2083
2084 static int _winbind_read_password(struct pwb_context *ctx,
2085 unsigned int ctrl,
2086 const char *comment,
2087 const char *prompt1,
2088 const char *prompt2,
2089 const char **pass)
2090 {
2091 int authtok_flag;
2092 int retval;
2093 const char *item;
2094 char *token;
2095
2096 _pam_log(ctx, LOG_DEBUG, "getting password (0x%08x)", ctrl);
2097
2098 /*
2099 * make sure nothing inappropriate gets returned
2100 */
2101
2102 *pass = token = NULL;
2103
2104 /*
2105 * which authentication token are we getting?
2106 */
2107
2108 if (on(WINBIND__OLD_PASSWORD, ctrl)) {
2109 authtok_flag = PAM_OLDAUTHTOK;
2110 } else {
2111 authtok_flag = PAM_AUTHTOK;
2112 }
2113
2114 /*
2115 * should we obtain the password from a PAM item ?
2116 */
2117
2118 if (on(WINBIND_TRY_FIRST_PASS_ARG, ctrl) ||
2119 on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2120 retval = _pam_get_item(ctx->pamh, authtok_flag, &item);
2121 if (retval != PAM_SUCCESS) {
2122 /* very strange. */
2123 _pam_log(ctx, LOG_ALERT,
2124 "pam_get_item returned error "
2125 "to unix-read-password");
2126 return retval;
2127 } else if (item != NULL) { /* we have a password! */
2128 *pass = item;
2129 item = NULL;
2130 _pam_log(ctx, LOG_DEBUG,
2131 "pam_get_item returned a password");
2132 return PAM_SUCCESS;
2133 } else if (on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2134 return PAM_AUTHTOK_RECOVER_ERR; /* didn't work */
2135 } else if (on(WINBIND_USE_AUTHTOK_ARG, ctrl)
2136 && off(WINBIND__OLD_PASSWORD, ctrl)) {
2137 return PAM_AUTHTOK_RECOVER_ERR;
2138 }
2139 }
2140 /*
2141 * getting here implies we will have to get the password from the
2142 * user directly.
2143 */
2144
2145 {
2146 struct pam_message msg[3], *pmsg[3];
2147 struct pam_response *resp;
2148 int i, replies;
2149
2150 /* prepare to converse */
2151
2152 if (comment != NULL && off(ctrl, WINBIND_SILENT)) {
2153 pmsg[0] = &msg[0];
2154 msg[0].msg_style = PAM_TEXT_INFO;
2155 msg[0].msg = discard_const_p(char, comment);
2156 i = 1;
2157 } else {
2158 i = 0;
2159 }
2160
2161 pmsg[i] = &msg[i];
2162 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2163 msg[i++].msg = discard_const_p(char, prompt1);
2164 replies = 1;
2165
2166 if (prompt2 != NULL) {
2167 pmsg[i] = &msg[i];
2168 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2169 msg[i++].msg = discard_const_p(char, prompt2);
2170 ++replies;
2171 }
2172 /* so call the conversation expecting i responses */
2173 resp = NULL;
2174 retval = converse(ctx->pamh, i, pmsg, &resp);
2175 if (resp == NULL) {
2176 if (retval == PAM_SUCCESS) {
2177 retval = PAM_AUTHTOK_RECOVER_ERR;
2178 }
2179 goto done;
2180 }
2181 if (retval != PAM_SUCCESS) {
2182 _pam_drop_reply(resp, i);
2183 goto done;
2184 }
2185
2186 /* interpret the response */
2187
2188 token = x_strdup(resp[i - replies].resp);
2189 if (!token) {
2190 _pam_log(ctx, LOG_NOTICE,
2191 "could not recover "
2192 "authentication token");
2193 retval = PAM_AUTHTOK_RECOVER_ERR;
2194 goto done;
2195 }
2196
2197 if (replies == 2) {
2198 /* verify that password entered correctly */
2199 if (!resp[i - 1].resp ||
2200 strcmp(token, resp[i - 1].resp)) {
2201 _pam_delete(token); /* mistyped */
2202 retval = PAM_AUTHTOK_RECOVER_ERR;
2203 _make_remark(ctx, PAM_ERROR_MSG,
2204 MISTYPED_PASS);
2205 }
2206 }
2207
2208 /*
2209 * tidy up the conversation (resp_retcode) is ignored
2210 * -- what is it for anyway? AGM
2211 */
2212 _pam_drop_reply(resp, i);
2213 }
2214
2215 done:
2216 if (retval != PAM_SUCCESS) {
2217 _pam_log_debug(ctx, LOG_DEBUG,
2218 "unable to obtain a password");
2219 return retval;
2220 }
2221 /* 'token' is the entered password */
2222
2223 /* we store this password as an item */
2224
2225 retval = pam_set_item(ctx->pamh, authtok_flag, token);
2226 _pam_delete(token); /* clean it up */
2227 if (retval != PAM_SUCCESS ||
2228 (retval = _pam_get_item(ctx->pamh, authtok_flag, &item)) != PAM_SUCCESS) {
2229
2230 _pam_log(ctx, LOG_CRIT, "error manipulating password");
2231 return retval;
2232
2233 }
2234
2235 *pass = item;
2236 item = NULL; /* break link to password */
2237
2238 return PAM_SUCCESS;
2239 }
2240
2241 static const char *get_conf_item_string(struct pwb_context *ctx,
2242 const char *item,
2243 int config_flag)
2244 {
2245 int i = 0;
2246 const char *parm_opt = NULL;
2247
2248 if (!(ctx->ctrl & config_flag)) {
2249 goto out;
2250 }
2251
2252 /* let the pam opt take precedence over the pam_winbind.conf option */
2253 for (i=0; i<ctx->argc; i++) {
2254
2255 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2256 char *p;
2257
2258 if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2259 _pam_log(ctx, LOG_INFO,
2260 "no \"=\" delimiter for \"%s\" found\n",
2261 item);
2262 goto out;
2263 }
2264 _pam_log_debug(ctx, LOG_INFO,
2265 "PAM config: %s '%s'\n", item, p+1);
2266 return p + 1;
2267 }
2268 }
2269
2270 if (ctx->dict) {
2271 char *key = NULL;
2272
2273 key = talloc_asprintf(ctx, "global:%s", item);
2274 if (!key) {
2275 goto out;
2276 }
2277
2278 parm_opt = iniparser_getstr(ctx->dict, key);
2279 TALLOC_FREE(key);
2280
2281 _pam_log_debug(ctx, LOG_INFO, "CONFIG file: %s '%s'\n",
2282 item, parm_opt);
2283 }
2284 out:
2285 return parm_opt;
2286 }
2287
2288 static int get_config_item_int(struct pwb_context *ctx,
2289 const char *item,
2290 int config_flag)
2291 {
2292 int i, parm_opt = -1;
2293
2294 if (!(ctx->ctrl & config_flag)) {
2295 goto out;
2296 }
2297
2298 /* let the pam opt take precedence over the pam_winbind.conf option */
2299 for (i = 0; i < ctx->argc; i++) {
2300
2301 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2302 char *p;
2303
2304 if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2305 _pam_log(ctx, LOG_INFO,
2306 "no \"=\" delimiter for \"%s\" found\n",
2307 item);
2308 goto out;
2309 }
2310 parm_opt = atoi(p + 1);
2311 _pam_log_debug(ctx, LOG_INFO,
2312 "PAM config: %s '%d'\n",
2313 item, parm_opt);
2314 return parm_opt;
2315 }
2316 }
2317
2318 if (ctx->dict) {
2319 char *key = NULL;
2320
2321 key = talloc_asprintf(ctx, "global:%s", item);
2322 if (!key) {
2323 goto out;
2324 }
2325
2326 parm_opt = iniparser_getint(ctx->dict, key, -1);
2327 TALLOC_FREE(key);
2328
2329 _pam_log_debug(ctx, LOG_INFO,
2330 "CONFIG file: %s '%d'\n",
2331 item, parm_opt);
2332 }
2333 out:
2334 return parm_opt;
2335 }
2336
2337 static const char *get_krb5_cc_type_from_config(struct pwb_context *ctx)
2338 {
2339 return get_conf_item_string(ctx, "krb5_ccache_type",
2340 WINBIND_KRB5_CCACHE_TYPE);
2341 }
2342
2343 static const char *get_member_from_config(struct pwb_context *ctx)
2344 {
2345 const char *ret = NULL;
2346 ret = get_conf_item_string(ctx, "require_membership_of",
2347 WINBIND_REQUIRED_MEMBERSHIP);
2348 if (ret) {
2349 return ret;
2350 }
2351 return get_conf_item_string(ctx, "require-membership-of",
2352 WINBIND_REQUIRED_MEMBERSHIP);
2353 }
2354
2355 static int get_warn_pwd_expire_from_config(struct pwb_context *ctx)
2356 {
2357 int ret;
2358 ret = get_config_item_int(ctx, "warn_pwd_expire",
2359 WINBIND_WARN_PWD_EXPIRE);
2360 /* no or broken setting */
2361 if (ret <= 0) {
2362 return DEFAULT_DAYS_TO_WARN_BEFORE_PWD_EXPIRES;
2363 }
2364 return ret;
2365 }
2366
2367 /**
2368 * Retrieve the winbind separator.
2369 *
2370 * @param ctx PAM winbind context.
2371 *
2372 * @return string separator character. NULL on failure.
2373 */
2374
2375 static char winbind_get_separator(struct pwb_context *ctx)
2376 {
2377 wbcErr wbc_status;
2378 static struct wbcInterfaceDetails *details = NULL;
2379
2380 wbc_status = wbcInterfaceDetails(&details);
2381 if (!WBC_ERROR_IS_OK(wbc_status)) {
2382 _pam_log(ctx, LOG_ERR,
2383 "Could not retrieve winbind interface details: %s",
2384 wbcErrorString(wbc_status));
2385 return '\0';
2386 }
2387
2388 if (!details) {
2389 return '\0';
2390 }
2391
2392 return details->winbind_separator;
2393 }
2394
2395
2396 /**
2397 * Convert a upn to a name.
2398 *
2399 * @param ctx PAM winbind context.
2400 * @param upn USer UPN to be trabslated.
2401 *
2402 * @return converted name. NULL pointer on failure. Caller needs to free.
2403 */
2404
2405 static char* winbind_upn_to_username(struct pwb_context *ctx,
2406 const char *upn)
2407 {
2408 char sep;
2409 wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;
2410 struct wbcDomainSid sid;
2411 enum wbcSidType type;
2412 char *domain = NULL;
2413 char *name;
2414 char *p;
2415
2416 /* This cannot work when the winbind separator = @ */
2417
2418 sep = winbind_get_separator(ctx);
2419 if (!sep || sep == '@') {
2420 return NULL;
2421 }
2422
2423 name = talloc_strdup(ctx, upn);
2424 if (!name) {
2425 return NULL;
2426 }
2427 if ((p = strchr(name, '@')) != NULL) {
2428 *p = 0;
2429 domain = p + 1;
2430 }
2431
2432 /* Convert the UPN to a SID */
2433
2434 wbc_status = wbcLookupName(domain, name, &sid, &type);
2435 if (!WBC_ERROR_IS_OK(wbc_status)) {
2436 return NULL;
2437 }
2438
2439 /* Convert the the SID back to the sAMAccountName */
2440
2441 wbc_status = wbcLookupSid(&sid, &domain, &name, &type);
2442 if (!WBC_ERROR_IS_OK(wbc_status)) {
2443 return NULL;
2444 }
2445
2446 return talloc_asprintf(ctx, "%s\\%s", domain, name);
2447 }
2448
2449 static int _pam_delete_cred(pam_handle_t *pamh, int flags,
2450 int argc, const char **argv)
2451 {
2452 int retval = PAM_SUCCESS;
2453 struct pwb_context *ctx = NULL;
2454 struct wbcLogoffUserParams logoff;
2455 struct wbcAuthErrorInfo *error = NULL;
2456 const char *user;
2457 wbcErr wbc_status = WBC_ERR_SUCCESS;
2458
2459 ZERO_STRUCT(logoff);
2460
2461 retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2462 if (retval) {
2463 goto out;
2464 }
2465
2466 _PAM_LOG_FUNCTION_ENTER("_pam_delete_cred", ctx);
2467
2468 if (ctx->ctrl & WINBIND_KRB5_AUTH) {
2469
2470 /* destroy the ccache here */
2471
2472 uint32_t wbc_flags = 0;
2473 const char *ccname = NULL;
2474 struct passwd *pwd = NULL;
2475
2476 retval = pam_get_user(pamh, &user, _("Username: "));
2477 if (retval) {
2478 _pam_log(ctx, LOG_ERR,
2479 "could not identify user");
2480 goto out;
2481 }
2482
2483 if (user == NULL) {
2484 _pam_log(ctx, LOG_ERR,
2485 "username was NULL!");
2486 retval = PAM_USER_UNKNOWN;
2487 goto out;
2488 }
2489
2490 _pam_log_debug(ctx, LOG_DEBUG,
2491 "username [%s] obtained", user);
2492
2493 ccname = pam_getenv(pamh, "KRB5CCNAME");
2494 if (ccname == NULL) {
2495 _pam_log_debug(ctx, LOG_DEBUG,
2496 "user has no KRB5CCNAME environment");
2497 }
2498
2499 pwd = getpwnam(user);
2500 if (pwd == NULL) {
2501 retval = PAM_USER_UNKNOWN;
2502 goto out;
2503 }
2504
2505 wbc_flags = WBFLAG_PAM_KRB5 |
2506 WBFLAG_PAM_CONTACT_TRUSTDOM;
2507
2508 logoff.username = user;
2509
2510 if (ccname) {
2511 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2512 &logoff.blobs,
2513 "ccfilename",
2514 0,
2515 discard_const_p(uint8_t, ccname),
2516 strlen(ccname)+1);
2517 if (!WBC_ERROR_IS_OK(wbc_status)) {
2518 goto out;
2519 }
2520 }
2521
2522 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2523 &logoff.blobs,
2524 "flags",
2525 0,
2526 (uint8_t *)&wbc_flags,
2527 sizeof(wbc_flags));
2528 if (!WBC_ERROR_IS_OK(wbc_status)) {
2529 goto out;
2530 }
2531
2532 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2533 &logoff.blobs,
2534 "user_uid",
2535 0,
2536 (uint8_t *)&pwd->pw_uid,
2537 sizeof(pwd->pw_uid));
2538 if (!WBC_ERROR_IS_OK(wbc_status)) {
2539 goto out;
2540 }
2541
2542 wbc_status = wbcLogoffUserEx(&logoff, &error);
2543 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2544 user, "wbcLogoffUser");
2545 wbcFreeMemory(error);
2546 wbcFreeMemory(logoff.blobs);
2547 logoff.blobs = NULL;
2548
2549 if (!WBC_ERROR_IS_OK(wbc_status)) {
2550 _pam_log(ctx, LOG_INFO,
2551 "failed to logoff user %s: %s\n",
2552 user, wbcErrorString(wbc_status));
2553 }
2554 }
2555
2556 out:
2557 if (logoff.blobs) {
2558 wbcFreeMemory(logoff.blobs);
2559 }
2560
2561 if (!WBC_ERROR_IS_OK(wbc_status)) {
2562 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2563 user, "wbcLogoffUser");
2564 }
2565
2566 /*
2567 * Delete the krb5 ccname variable from the PAM environment
2568 * if it was set by winbind.
2569 */
2570 if ((ctx->ctrl & WINBIND_KRB5_AUTH) && pam_getenv(pamh, "KRB5CCNAME")) {
2571 pam_putenv(pamh, "KRB5CCNAME");
2572 }
2573
2574 _PAM_LOG_FUNCTION_LEAVE("_pam_delete_cred", ctx, retval);
2575
2576 TALLOC_FREE(ctx);
2577
2578 return retval;
2579 }
2580
2581 PAM_EXTERN
2582 int pam_sm_authenticate(pam_handle_t *pamh, int flags,
2583 int argc, const char **argv)
2584 {
2585 const char *username;
2586 const char *password;
2587 const char *member = NULL;
2588 const char *cctype = NULL;
2589 int warn_pwd_expire;
2590 int retval = PAM_AUTH_ERR;
2591 char *username_ret = NULL;
2592 char *new_authtok_required = NULL;
2593 char *real_username = NULL;
2594 struct pwb_context *ctx = NULL;
2595
2596 retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2597 if (retval) {
2598 goto out;
2599 }
2600
2601 _PAM_LOG_FUNCTION_ENTER("pam_sm_authenticate", ctx);
2602
2603 /* Get the username */
2604 retval = pam_get_user(pamh, &username, NULL);
2605 if ((retval != PAM_SUCCESS) || (!username)) {
2606 _pam_log_debug(ctx, LOG_DEBUG,
2607 "can not get the username");
2608 retval = PAM_SERVICE_ERR;
2609 goto out;
2610 }
2611
2612
2613 #if defined(AIX)
2614 /* Decode the user name since AIX does not support logn user
2615 names by default. The name is encoded as _#uid. */
2616
2617 if (username[0] == '_') {
2618 uid_t id = atoi(&username[1]);
2619 struct passwd *pw = NULL;
2620
2621 if ((id!=0) && ((pw = getpwuid(id)) != NULL)) {
2622 real_username = strdup(pw->pw_name);
2623 }
2624 }
2625 #endif
2626
2627 if (!real_username) {
2628 /* Just making a copy of the username we got from PAM */
2629 if ((real_username = strdup(username)) == NULL) {
2630 _pam_log_debug(ctx, LOG_DEBUG,
2631 "memory allocation failure when copying "
2632 "username");
2633 retval = PAM_SERVICE_ERR;
2634 goto out;
2635 }
2636 }
2637
2638 /* Maybe this was a UPN */
2639
2640 if (strchr(real_username, '@') != NULL) {
2641 char *samaccountname = NULL;
2642
2643 samaccountname = winbind_upn_to_username(ctx,
2644 real_username);
2645 if (samaccountname) {
2646 free(real_username);
2647 real_username = strdup(samaccountname);
2648 }
2649 }
2650
2651 retval = _winbind_read_password(ctx, ctx->ctrl, NULL,
2652 _("Password: "), NULL,
2653 &password);
2654
2655 if (retval != PAM_SUCCESS) {
2656 _pam_log(ctx, LOG_ERR,
2657 "Could not retrieve user's password");
2658 retval = PAM_AUTHTOK_ERR;
2659 goto out;
2660 }
2661
2662 /* Let's not give too much away in the log file */
2663
2664 #ifdef DEBUG_PASSWORD
2665 _pam_log_debug(ctx, LOG_INFO,
2666 "Verify user '%s' with password '%s'",
2667 real_username, password);
2668 #else
2669 _pam_log_debug(ctx, LOG_INFO,
2670 "Verify user '%s'", real_username);
2671 #endif
2672
2673 member = get_member_from_config(ctx);
2674 cctype = get_krb5_cc_type_from_config(ctx);
2675 warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
2676
2677 /* Now use the username to look up password */
2678 retval = winbind_auth_request(ctx, real_username, password,
2679 member, cctype, warn_pwd_expire,
2680 NULL, NULL, NULL,
2681 NULL, &username_ret);
2682
2683 if (retval == PAM_NEW_AUTHTOK_REQD ||
2684 retval == PAM_AUTHTOK_EXPIRED) {
2685
2686 char *new_authtok_required_during_auth = NULL;
2687
2688 new_authtok_required = talloc_asprintf(NULL, "%d", retval);
2689 if (!new_authtok_required) {
2690 retval = PAM_BUF_ERR;
2691 goto out;
2692 }
2693
2694 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2695 new_authtok_required,
2696 _pam_winbind_cleanup_func);
2697
2698 retval = PAM_SUCCESS;
2699
2700 new_authtok_required_during_auth = talloc_asprintf(NULL, "%d", true);
2701 if (!new_authtok_required_during_auth) {
2702 retval = PAM_BUF_ERR;
2703 goto out;
2704 }
2705
2706 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2707 new_authtok_required_during_auth,
2708 _pam_winbind_cleanup_func);
2709
2710 goto out;
2711 }
2712
2713 out:
2714 if (username_ret) {
2715 pam_set_item (pamh, PAM_USER, username_ret);
2716 _pam_log_debug(ctx, LOG_INFO,
2717 "Returned user was '%s'", username_ret);
2718 free(username_ret);
2719 }
2720
2721 if (real_username) {
2722 free(real_username);
2723 }
2724
2725 if (!new_authtok_required) {
2726 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, NULL, NULL);
2727 }
2728
2729 if (retval != PAM_SUCCESS) {
2730 _pam_free_data_info3(pamh);
2731 }
2732
2733 _PAM_LOG_FUNCTION_LEAVE("pam_sm_authenticate", ctx, retval);
2734
2735 TALLOC_FREE(ctx);
2736
2737 return retval;
2738 }
2739
2740 PAM_EXTERN
2741 int pam_sm_setcred(pam_handle_t *pamh, int flags,
2742 int argc, const char **argv)
2743 {
2744 int ret = PAM_SYSTEM_ERR;
2745 struct pwb_context *ctx = NULL;
2746
2747 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2748 if (ret) {
2749 goto out;
2750 }
2751
2752 _PAM_LOG_FUNCTION_ENTER("pam_sm_setcred", ctx);
2753
2754 switch (flags & ~PAM_SILENT) {
2755
2756 case PAM_DELETE_CRED:
2757 ret = _pam_delete_cred(pamh, flags, argc, argv);
2758 break;
2759 case PAM_REFRESH_CRED:
2760 _pam_log_debug(ctx, LOG_WARNING,
2761 "PAM_REFRESH_CRED not implemented");
2762 ret = PAM_SUCCESS;
2763 break;
2764 case PAM_REINITIALIZE_CRED:
2765 _pam_log_debug(ctx, LOG_WARNING,
2766 "PAM_REINITIALIZE_CRED not implemented");
2767 ret = PAM_SUCCESS;
2768 break;
2769 case PAM_ESTABLISH_CRED:
2770 _pam_log_debug(ctx, LOG_WARNING,
2771 "PAM_ESTABLISH_CRED not implemented");
2772 ret = PAM_SUCCESS;
2773 break;
2774 default:
2775 ret = PAM_SYSTEM_ERR;
2776 break;
2777 }
2778
2779 out:
2780
2781 _PAM_LOG_FUNCTION_LEAVE("pam_sm_setcred", ctx, ret);
2782
2783 TALLOC_FREE(ctx);
2784
2785 return ret;
2786 }
2787
2788 /*
2789 * Account management. We want to verify that the account exists
2790 * before returning PAM_SUCCESS
2791 */
2792 PAM_EXTERN
2793 int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
2794 int argc, const char **argv)
2795 {
2796 const char *username;
2797 int ret = PAM_USER_UNKNOWN;
2798 void *tmp = NULL;
2799 struct pwb_context *ctx = NULL;
2800
2801 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2802 if (ret) {
2803 goto out;
2804 }
2805
2806 _PAM_LOG_FUNCTION_ENTER("pam_sm_acct_mgmt", ctx);
2807
2808
2809 /* Get the username */
2810 ret = pam_get_user(pamh, &username, NULL);
2811 if ((ret != PAM_SUCCESS) || (!username)) {
2812 _pam_log_debug(ctx, LOG_DEBUG,
2813 "can not get the username");
2814 ret = PAM_SERVICE_ERR;
2815 goto out;
2816 }
2817
2818 /* Verify the username */
2819 ret = valid_user(ctx, username);
2820 switch (ret) {
2821 case -1:
2822 /* some sort of system error. The log was already printed */
2823 ret = PAM_SERVICE_ERR;
2824 goto out;
2825 case 1:
2826 /* the user does not exist */
2827 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
2828 username);
2829 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
2830 ret = PAM_IGNORE;
2831 goto out;
2832 }
2833 ret = PAM_USER_UNKNOWN;
2834 goto out;
2835 case 0:
2836 pam_get_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2837 (const void **)&tmp);
2838 if (tmp != NULL) {
2839 ret = atoi((const char *)tmp);
2840 switch (ret) {
2841 case PAM_AUTHTOK_EXPIRED:
2842 /* fall through, since new token is required in this case */
2843 case PAM_NEW_AUTHTOK_REQD:
2844 _pam_log(ctx, LOG_WARNING,
2845 "pam_sm_acct_mgmt success but %s is set",
2846 PAM_WINBIND_NEW_AUTHTOK_REQD);
2847 _pam_log(ctx, LOG_NOTICE,
2848 "user '%s' needs new password",
2849 username);
2850 /* PAM_AUTHTOKEN_REQD does not exist, but is documented in the manpage */
2851 ret = PAM_NEW_AUTHTOK_REQD;
2852 goto out;
2853 default:
2854 _pam_log(ctx, LOG_WARNING,
2855 "pam_sm_acct_mgmt success");
2856 _pam_log(ctx, LOG_NOTICE,
2857 "user '%s' granted access", username);
2858 ret = PAM_SUCCESS;
2859 goto out;
2860 }
2861 }
2862
2863 /* Otherwise, the authentication looked good */
2864 _pam_log(ctx, LOG_NOTICE,
2865 "user '%s' granted access", username);
2866 ret = PAM_SUCCESS;
2867 goto out;
2868 default:
2869 /* we don't know anything about this return value */
2870 _pam_log(ctx, LOG_ERR,
2871 "internal module error (ret = %d, user = '%s')",
2872 ret, username);
2873 ret = PAM_SERVICE_ERR;
2874 goto out;
2875 }
2876
2877 /* should not be reached */
2878 ret = PAM_IGNORE;
2879
2880 out:
2881
2882 _PAM_LOG_FUNCTION_LEAVE("pam_sm_acct_mgmt", ctx, ret);
2883
2884 TALLOC_FREE(ctx);
2885
2886 return ret;
2887 }
2888
2889 PAM_EXTERN
2890 int pam_sm_open_session(pam_handle_t *pamh, int flags,
2891 int argc, const char **argv)
2892 {
2893 int ret = PAM_SUCCESS;
2894 struct pwb_context *ctx = NULL;
2895
2896 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2897 if (ret) {
2898 goto out;
2899 }
2900
2901 _PAM_LOG_FUNCTION_ENTER("pam_sm_open_session", ctx);
2902
2903 if (ctx->ctrl & WINBIND_MKHOMEDIR) {
2904 /* check and create homedir */
2905 ret = _pam_mkhomedir(ctx);
2906 }
2907 out:
2908 _PAM_LOG_FUNCTION_LEAVE("pam_sm_open_session", ctx, ret);
2909
2910 TALLOC_FREE(ctx);
2911
2912 return ret;
2913 }
2914
2915 PAM_EXTERN
2916 int pam_sm_close_session(pam_handle_t *pamh, int flags,
2917 int argc, const char **argv)
2918 {
2919 int ret = PAM_SUCCESS;
2920 struct pwb_context *ctx = NULL;
2921
2922 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2923 if (ret) {
2924 goto out;
2925 }
2926
2927 _PAM_LOG_FUNCTION_ENTER("pam_sm_close_session", ctx);
2928
2929 out:
2930 _PAM_LOG_FUNCTION_LEAVE("pam_sm_close_session", ctx, ret);
2931
2932 TALLOC_FREE(ctx);
2933
2934 return ret;
2935 }
2936
2937 /**
2938 * evaluate whether we need to re-authenticate with kerberos after a
2939 * password change
2940 *
2941 * @param ctx PAM winbind context.
2942 * @param user The username
2943 *
2944 * @return boolean Returns true if required, false if not.
2945 */
2946
2947 static bool _pam_require_krb5_auth_after_chauthtok(struct pwb_context *ctx,
2948 const char *user)
2949 {
2950
2951 /* Make sure that we only do this if a) the chauthtok got initiated
2952 * during a logon attempt (authenticate->acct_mgmt->chauthtok) b) any
2953 * later password change via the "passwd" command if done by the user
2954 * itself
2955 * NB. If we login from gdm or xdm and the password expires,
2956 * we change the password, but there is no memory cache.
2957 * Thus, even for passthrough login, we should do the
2958 * authentication again to update memory cache.
2959 * --- BoYang
2960 * */
2961
2962 char *new_authtok_reqd_during_auth = NULL;
2963 struct passwd *pwd = NULL;
2964
2965 _pam_get_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2966 &new_authtok_reqd_during_auth);
2967 pam_set_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2968 NULL, NULL);
2969
2970 if (new_authtok_reqd_during_auth) {
2971 return true;
2972 }
2973
2974 pwd = getpwnam(user);
2975 if (!pwd) {
2976 return false;
2977 }
2978
2979 if (getuid() == pwd->pw_uid) {
2980 return true;
2981 }
2982
2983 return false;
2984 }
2985
2986
2987 PAM_EXTERN
2988 int pam_sm_chauthtok(pam_handle_t * pamh, int flags,
2989 int argc, const char **argv)
2990 {
2991 unsigned int lctrl;
2992 int ret;
2993 bool cached_login = false;
2994
2995 /* <DO NOT free() THESE> */
2996 const char *user;
2997 char *pass_old, *pass_new;
2998 /* </DO NOT free() THESE> */
2999
3000 char *Announce;
3001
3002 int retry = 0;
3003 char *username_ret = NULL;
3004 struct wbcAuthErrorInfo *error = NULL;
3005 struct pwb_context *ctx = NULL;
3006
3007 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
3008 if (ret) {
3009 goto out;
3010 }
3011
3012 _PAM_LOG_FUNCTION_ENTER("pam_sm_chauthtok", ctx);
3013
3014 cached_login = (ctx->ctrl & WINBIND_CACHED_LOGIN);
3015
3016 /* clearing offline bit for auth */
3017 ctx->ctrl &= ~WINBIND_CACHED_LOGIN;
3018
3019 /*
3020 * First get the name of a user
3021 */
3022 ret = pam_get_user(pamh, &user, _("Username: "));
3023 if (ret) {
3024 _pam_log(ctx, LOG_ERR,
3025 "password - could not identify user");
3026 goto out;
3027 }
3028
3029 if (user == NULL) {
3030 _pam_log(ctx, LOG_ERR, "username was NULL!");
3031 ret = PAM_USER_UNKNOWN;
3032 goto out;
3033 }
3034
3035 _pam_log_debug(ctx, LOG_DEBUG, "username [%s] obtained", user);
3036
3037 /* check if this is really a user in winbindd, not only in NSS */
3038 ret = valid_user(ctx, user);
3039 switch (ret) {
3040 case 1:
3041 ret = PAM_USER_UNKNOWN;
3042 goto out;
3043 case -1:
3044 ret = PAM_SYSTEM_ERR;
3045 goto out;
3046 default:
3047 break;
3048 }
3049
3050 /*
3051 * obtain and verify the current password (OLDAUTHTOK) for
3052 * the user.
3053 */
3054
3055 if (flags & PAM_PRELIM_CHECK) {
3056 time_t pwdlastset_prelim = 0;
3057
3058 /* instruct user what is happening */
3059
3060 #define greeting _("Changing password for")
3061 Announce = talloc_asprintf(ctx, "%s %s", greeting, user);
3062 if (!Announce) {
3063 _pam_log(ctx, LOG_CRIT,
3064 "password - out of memory");
3065 ret = PAM_BUF_ERR;
3066 goto out;
3067 }
3068 #undef greeting
3069
3070 lctrl = ctx->ctrl | WINBIND__OLD_PASSWORD;
3071 ret = _winbind_read_password(ctx, lctrl,
3072 Announce,
3073 _("(current) NT password: "),
3074 NULL,
3075 (const char **) &pass_old);
3076 TALLOC_FREE(Announce);
3077 if (ret != PAM_SUCCESS) {
3078 _pam_log(ctx, LOG_NOTICE,
3079 "password - (old) token not obtained");
3080 goto out;
3081 }
3082
3083 /* verify that this is the password for this user */
3084
3085 ret = winbind_auth_request(ctx, user, pass_old,
3086 NULL, NULL, 0,
3087 &error, NULL, NULL,
3088 &pwdlastset_prelim, NULL);
3089
3090 if (ret != PAM_ACCT_EXPIRED &&
3091 ret != PAM_AUTHTOK_EXPIRED &&
3092 ret != PAM_NEW_AUTHTOK_REQD &&
3093 ret != PAM_SUCCESS) {
3094 pass_old = NULL;
3095 goto out;
3096 }
3097
3098 pam_set_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3099 (void *)pwdlastset_prelim, NULL);
3100
3101 ret = pam_set_item(pamh, PAM_OLDAUTHTOK,
3102 (const void *) pass_old);
3103 pass_old = NULL;
3104 if (ret != PAM_SUCCESS) {
3105 _pam_log(ctx, LOG_CRIT,
3106 "failed to set PAM_OLDAUTHTOK");
3107 }
3108 } else if (flags & PAM_UPDATE_AUTHTOK) {
3109
3110 time_t pwdlastset_update = 0;
3111
3112 /*
3113 * obtain the proposed password
3114 */
3115
3116 /*
3117 * get the old token back.
3118 */
3119
3120 ret = _pam_get_item(pamh, PAM_OLDAUTHTOK, &pass_old);
3121
3122 if (ret != PAM_SUCCESS) {
3123 _pam_log(ctx, LOG_NOTICE,
3124 "user not authenticated");
3125 goto out;
3126 }
3127
3128 lctrl = ctx->ctrl & ~WINBIND_TRY_FIRST_PASS_ARG;
3129
3130 if (on(WINBIND_USE_AUTHTOK_ARG, lctrl)) {
3131 lctrl |= WINBIND_USE_FIRST_PASS_ARG;
3132 }
3133 retry = 0;
3134 ret = PAM_AUTHTOK_ERR;
3135 while ((ret != PAM_SUCCESS) && (retry++ < MAX_PASSWD_TRIES)) {
3136 /*
3137 * use_authtok is to force the use of a previously entered
3138 * password -- needed for pluggable password strength checking
3139 */
3140
3141 ret = _winbind_read_password(ctx, lctrl,
3142 NULL,
3143 _("Enter new NT password: "),
3144 _("Retype new NT password: "),
3145 (const char **)&pass_new);
3146
3147 if (ret != PAM_SUCCESS) {
3148 _pam_log_debug(ctx, LOG_ALERT,
3149 "password - "
3150 "new password not obtained");
3151 pass_old = NULL;/* tidy up */
3152 goto out;
3153 }
3154
3155 /*
3156 * At this point we know who the user is and what they
3157 * propose as their new password. Verify that the new
3158 * password is acceptable.
3159 */
3160
3161 if (pass_new[0] == '\0') {/* "\0" password = NULL */
3162 pass_new = NULL;
3163 }
3164 }
3165
3166 /*
3167 * By reaching here we have approved the passwords and must now
3168 * rebuild the password database file.
3169 */
3170 _pam_get_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3171 &pwdlastset_update);
3172
3173 /*
3174 * if cached creds were enabled, make sure to set the
3175 * WINBIND_CACHED_LOGIN bit here in order to have winbindd
3176 * update the cached creds storage - gd
3177 */
3178 if (cached_login) {
3179 ctx->ctrl |= WINBIND_CACHED_LOGIN;
3180 }
3181
3182 ret = winbind_chauthtok_request(ctx, user, pass_old,
3183 pass_new, pwdlastset_update);
3184 if (ret) {
3185 pass_old = pass_new = NULL;
3186 goto out;
3187 }
3188
3189 if (_pam_require_krb5_auth_after_chauthtok(ctx, user)) {
3190
3191 const char *member = NULL;
3192 const char *cctype = NULL;
3193 int warn_pwd_expire;
3194 struct wbcLogonUserInfo *info = NULL;
3195 struct wbcUserPasswordPolicyInfo *policy = NULL;
3196
3197 member = get_member_from_config(ctx);
3198 cctype = get_krb5_cc_type_from_config(ctx);
3199 warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
3200
3201 /* Keep WINBIND_CACHED_LOGIN bit for
3202 * authentication after changing the password.
3203 * This will update the cached credentials in case
3204 * that winbindd_dual_pam_chauthtok() fails
3205 * to update them.
3206 * --- BoYang
3207 * */
3208
3209 ret = winbind_auth_request(ctx, user, pass_new,
3210 member, cctype, 0,
3211 &error, &info, &policy,
3212 NULL, &username_ret);
3213 pass_old = pass_new = NULL;
3214
3215 if (ret == PAM_SUCCESS) {
3216
3217 struct wbcAuthUserInfo *user_info = NULL;
3218
3219 if (info && info->info) {
3220 user_info = info->info;
3221 }
3222
3223 /* warn a user if the password is about to
3224 * expire soon */
3225 _pam_warn_password_expiry(ctx, user_info, policy,
3226 warn_pwd_expire,
3227 NULL, NULL);
3228
3229 /* set some info3 info for other modules in the
3230 * stack */
3231 _pam_set_data_info3(ctx, user_info);
3232
3233 /* put krb5ccname into env */
3234 _pam_setup_krb5_env(ctx, info);
3235
3236 if (username_ret) {
3237 pam_set_item(pamh, PAM_USER,
3238 username_ret);
3239 _pam_log_debug(ctx, LOG_INFO,
3240 "Returned user was '%s'",
3241 username_ret);
3242 free(username_ret);
3243 }
3244
3245 }
3246
3247 if (info && info->blobs) {
3248 wbcFreeMemory(info->blobs);
3249 }
3250 wbcFreeMemory(info);
3251 wbcFreeMemory(policy);
3252
3253 goto out;
3254 }
3255 } else {
3256 ret = PAM_SERVICE_ERR;
3257 }
3258
3259 out:
3260 {
3261 /* Deal with offline errors. */
3262 int i;
3263 const char *codes[] = {
3264 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
3265 "NT_STATUS_NO_LOGON_SERVERS",
3266 "NT_STATUS_ACCESS_DENIED"
3267 };
3268
3269 for (i=0; i<ARRAY_SIZE(codes); i++) {
3270 int _ret;
3271 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
3272 break;
3273 }
3274 }
3275 }
3276
3277 wbcFreeMemory(error);
3278
3279 _PAM_LOG_FUNCTION_LEAVE("pam_sm_chauthtok", ctx, ret);
3280
3281 TALLOC_FREE(ctx);
3282
3283 return ret;
3284 }
3285
3286 #ifdef PAM_STATIC
3287
3288 /* static module data */
3289
3290 struct pam_module _pam_winbind_modstruct = {
3291 MODULE_NAME,
3292 pam_sm_authenticate,
3293 pam_sm_setcred,
3294 pam_sm_acct_mgmt,
3295 pam_sm_open_session,
3296 pam_sm_close_session,
3297 pam_sm_chauthtok
3298 };
3299
3300 #endif
3301
3302 /*
3303 * Copyright (c) Andrew Tridgell <tridge@samba.org> 2000
3304 * Copyright (c) Tim Potter <tpot@samba.org> 2000
3305 * Copyright (c) Andrew Bartlettt <abartlet@samba.org> 2002
3306 * Copyright (c) Guenther Deschner <gd@samba.org> 2005-2008
3307 * Copyright (c) Jan Rêkorajski 1999.
3308 * Copyright (c) Andrew G. Morgan 1996-8.
3309 * Copyright (c) Alex O. Yuriev, 1996.
3310 * Copyright (c) Cristian Gafton 1996.
3311 * Copyright (C) Elliot Lee <sopwith@redhat.com> 1996, Red Hat Software.
3312 *
3313 * Redistribution and use in source and binary forms, with or without
3314 * modification, are permitted provided that the following conditions
3315 * are met:
3316 * 1. Redistributions of source code must retain the above copyright
3317 * notice, and the entire permission notice in its entirety,
3318 * including the disclaimer of warranties.
3319 * 2. Redistributions in binary form must reproduce the above copyright
3320 * notice, this list of conditions and the following disclaimer in the
3321 * documentation and/or other materials provided with the distribution.
3322 * 3. The name of the author may not be used to endorse or promote
3323 * products derived from this software without specific prior
3324 * written permission.
3325 *
3326 * ALTERNATIVELY, this product may be distributed under the terms of
3327 * the GNU Public License, in which case the provisions of the GPL are
3328 * required INSTEAD OF the above restrictions. (This clause is
3329 * necessary due to a potential bad interaction between the GPL and
3330 * the restrictions contained in a BSD-style copyright.)
3331 *
3332 * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
3333 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
3334 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
3335 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
3336 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
3337 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
3338 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
3339 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
3340 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
3341 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
3342 * OF THE POSSIBILITY OF SUCH DAMAGE.
3343 */
reg import