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dsdb: Simplify DsCrackNameOneFilter a bit
[Samba.git] / nsswitch / pam_winbind.c
blob29d6f7c7bc37de8c7bebfeccab0f8c54d90887d7
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 #define UID_WRAPPER_NOT_REPLACE
14
15 #include "pam_winbind.h"
16
17 static int wbc_error_to_pam_error(wbcErr status)
18 {
19 switch (status) {
20 case WBC_ERR_SUCCESS:
21 return PAM_SUCCESS;
22 case WBC_ERR_NOT_IMPLEMENTED:
23 return PAM_SERVICE_ERR;
24 case WBC_ERR_UNKNOWN_FAILURE:
25 break;
26 case WBC_ERR_NO_MEMORY:
27 return PAM_BUF_ERR;
28 case WBC_ERR_INVALID_SID:
29 case WBC_ERR_INVALID_PARAM:
30 break;
31 case WBC_ERR_WINBIND_NOT_AVAILABLE:
32 return PAM_AUTHINFO_UNAVAIL;
33 case WBC_ERR_DOMAIN_NOT_FOUND:
34 return PAM_AUTHINFO_UNAVAIL;
35 case WBC_ERR_INVALID_RESPONSE:
36 return PAM_BUF_ERR;
37 case WBC_ERR_NSS_ERROR:
38 return PAM_USER_UNKNOWN;
39 case WBC_ERR_AUTH_ERROR:
40 return PAM_AUTH_ERR;
41 case WBC_ERR_UNKNOWN_USER:
42 return PAM_USER_UNKNOWN;
43 case WBC_ERR_UNKNOWN_GROUP:
44 return PAM_USER_UNKNOWN;
45 case WBC_ERR_PWD_CHANGE_FAILED:
46 break;
47 }
48
49 /* be paranoid */
50 return PAM_AUTH_ERR;
51 }
52
53 static const char *_pam_error_code_str(int err)
54 {
55 switch (err) {
56 case PAM_SUCCESS:
57 return "PAM_SUCCESS";
58 case PAM_OPEN_ERR:
59 return "PAM_OPEN_ERR";
60 case PAM_SYMBOL_ERR:
61 return "PAM_SYMBOL_ERR";
62 case PAM_SERVICE_ERR:
63 return "PAM_SERVICE_ERR";
64 case PAM_SYSTEM_ERR:
65 return "PAM_SYSTEM_ERR";
66 case PAM_BUF_ERR:
67 return "PAM_BUF_ERR";
68 case PAM_PERM_DENIED:
69 return "PAM_PERM_DENIED";
70 case PAM_AUTH_ERR:
71 return "PAM_AUTH_ERR";
72 case PAM_CRED_INSUFFICIENT:
73 return "PAM_CRED_INSUFFICIENT";
74 case PAM_AUTHINFO_UNAVAIL:
75 return "PAM_AUTHINFO_UNAVAIL";
76 case PAM_USER_UNKNOWN:
77 return "PAM_USER_UNKNOWN";
78 case PAM_MAXTRIES:
79 return "PAM_MAXTRIES";
80 case PAM_NEW_AUTHTOK_REQD:
81 return "PAM_NEW_AUTHTOK_REQD";
82 case PAM_ACCT_EXPIRED:
83 return "PAM_ACCT_EXPIRED";
84 case PAM_SESSION_ERR:
85 return "PAM_SESSION_ERR";
86 case PAM_CRED_UNAVAIL:
87 return "PAM_CRED_UNAVAIL";
88 case PAM_CRED_EXPIRED:
89 return "PAM_CRED_EXPIRED";
90 case PAM_CRED_ERR:
91 return "PAM_CRED_ERR";
92 case PAM_NO_MODULE_DATA:
93 return "PAM_NO_MODULE_DATA";
94 case PAM_CONV_ERR:
95 return "PAM_CONV_ERR";
96 case PAM_AUTHTOK_ERR:
97 return "PAM_AUTHTOK_ERR";
98 case PAM_AUTHTOK_RECOVER_ERR:
99 return "PAM_AUTHTOK_RECOVER_ERR";
100 case PAM_AUTHTOK_LOCK_BUSY:
101 return "PAM_AUTHTOK_LOCK_BUSY";
102 case PAM_AUTHTOK_DISABLE_AGING:
103 return "PAM_AUTHTOK_DISABLE_AGING";
104 case PAM_TRY_AGAIN:
105 return "PAM_TRY_AGAIN";
106 case PAM_IGNORE:
107 return "PAM_IGNORE";
108 case PAM_ABORT:
109 return "PAM_ABORT";
110 case PAM_AUTHTOK_EXPIRED:
111 return "PAM_AUTHTOK_EXPIRED";
112 #ifdef PAM_MODULE_UNKNOWN
113 case PAM_MODULE_UNKNOWN:
114 return "PAM_MODULE_UNKNOWN";
115 #endif
116 #ifdef PAM_BAD_ITEM
117 case PAM_BAD_ITEM:
118 return "PAM_BAD_ITEM";
119 #endif
120 #ifdef PAM_CONV_AGAIN
121 case PAM_CONV_AGAIN:
122 return "PAM_CONV_AGAIN";
123 #endif
124 #ifdef PAM_INCOMPLETE
125 case PAM_INCOMPLETE:
126 return "PAM_INCOMPLETE";
127 #endif
128 default:
129 return NULL;
130 }
131 }
132
133 #define _PAM_LOG_FUNCTION_ENTER(function, ctx) \
134 do { \
135 _pam_log_debug(ctx, LOG_DEBUG, "[pamh: %p] ENTER: " \
136 function " (flags: 0x%04x)", ctx->pamh, ctx->flags); \
137 _pam_log_state(ctx); \
138 } while (0)
139
140 #define _PAM_LOG_FUNCTION_LEAVE(function, ctx, retval) \
141 do { \
142 _pam_log_debug(ctx, LOG_DEBUG, "[pamh: %p] LEAVE: " \
143 function " returning %d (%s)", ctx->pamh, retval, \
144 _pam_error_code_str(retval)); \
145 _pam_log_state(ctx); \
146 } while (0)
147
148 /* data tokens */
149
150 #define MAX_PASSWD_TRIES 3
151
152 #ifdef HAVE_GETTEXT
153 static char initialized = 0;
154
155 static inline void textdomain_init(void);
156 static inline void textdomain_init(void)
157 {
158 if (!initialized) {
159 bindtextdomain(MODULE_NAME, LOCALEDIR);
160 initialized = 1;
161 }
162 return;
163 }
164 #endif
165
166
167 /*
168 * Work around the pam API that has functions with void ** as parameters
169 * These lead to strict aliasing warnings with gcc.
170 */
171 static int _pam_get_item(const pam_handle_t *pamh,
172 int item_type,
173 const void *_item)
174 {
175 const void **item = (const void **)_item;
176 return pam_get_item(pamh, item_type, item);
177 }
178 static int _pam_get_data(const pam_handle_t *pamh,
179 const char *module_data_name,
180 const void *_data)
181 {
182 const void **data = (const void **)_data;
183 return pam_get_data(pamh, module_data_name, data);
184 }
185
186 /* some syslogging */
187
188 #ifdef HAVE_PAM_VSYSLOG
189 static void _pam_log_int(const pam_handle_t *pamh,
190 int err,
191 const char *format,
192 va_list args)
193 {
194 pam_vsyslog(pamh, err, format, args);
195 }
196 #else
197 static void _pam_log_int(const pam_handle_t *pamh,
198 int err,
199 const char *format,
200 va_list args)
201 {
202 char *format2 = NULL;
203 const char *service;
204
205 _pam_get_item(pamh, PAM_SERVICE, &service);
206
207 format2 = (char *)malloc(strlen(MODULE_NAME)+strlen(format)+strlen(service)+5);
208 if (format2 == NULL) {
209 /* what else todo ? */
210 vsyslog(err, format, args);
211 return;
212 }
213
214 sprintf(format2, "%s(%s): %s", MODULE_NAME, service, format);
215 vsyslog(err, format2, args);
216 SAFE_FREE(format2);
217 }
218 #endif /* HAVE_PAM_VSYSLOG */
219
220 static bool _pam_log_is_silent(int ctrl)
221 {
222 return on(ctrl, WINBIND_SILENT);
223 }
224
225 static void _pam_log(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
226 static void _pam_log(struct pwb_context *r, int err, const char *format, ...)
227 {
228 va_list args;
229
230 if (_pam_log_is_silent(r->ctrl)) {
231 return;
232 }
233
234 va_start(args, format);
235 _pam_log_int(r->pamh, err, format, args);
236 va_end(args);
237 }
238 static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
239 static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
240 {
241 va_list args;
242
243 if (_pam_log_is_silent(ctrl)) {
244 return;
245 }
246
247 va_start(args, format);
248 _pam_log_int(pamh, err, format, args);
249 va_end(args);
250 }
251
252 static bool _pam_log_is_debug_enabled(int ctrl)
253 {
254 if (ctrl == -1) {
255 return false;
256 }
257
258 if (_pam_log_is_silent(ctrl)) {
259 return false;
260 }
261
262 if (!(ctrl & WINBIND_DEBUG_ARG)) {
263 return false;
264 }
265
266 return true;
267 }
268
269 static bool _pam_log_is_debug_state_enabled(int ctrl)
270 {
271 if (!(ctrl & WINBIND_DEBUG_STATE)) {
272 return false;
273 }
274
275 return _pam_log_is_debug_enabled(ctrl);
276 }
277
278 static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
279 static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...)
280 {
281 va_list args;
282
283 if (!_pam_log_is_debug_enabled(r->ctrl)) {
284 return;
285 }
286
287 va_start(args, format);
288 _pam_log_int(r->pamh, err, format, args);
289 va_end(args);
290 }
291 static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
292 static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
293 {
294 va_list args;
295
296 if (!_pam_log_is_debug_enabled(ctrl)) {
297 return;
298 }
299
300 va_start(args, format);
301 _pam_log_int(pamh, err, format, args);
302 va_end(args);
303 }
304
305 static void _pam_log_state_datum(struct pwb_context *ctx,
306 int item_type,
307 const char *key,
308 int is_string)
309 {
310 const void *data = NULL;
311 if (item_type != 0) {
312 pam_get_item(ctx->pamh, item_type, &data);
313 } else {
314 pam_get_data(ctx->pamh, key, &data);
315 }
316 if (data != NULL) {
317 const char *type = (item_type != 0) ? "ITEM" : "DATA";
318 if (is_string != 0) {
319 _pam_log_debug(ctx, LOG_DEBUG,
320 "[pamh: %p] STATE: %s(%s) = \"%s\" (%p)",
321 ctx->pamh, type, key, (const char *)data,
322 data);
323 } else {
324 _pam_log_debug(ctx, LOG_DEBUG,
325 "[pamh: %p] STATE: %s(%s) = %p",
326 ctx->pamh, type, key, data);
327 }
328 }
329 }
330
331 #define _PAM_LOG_STATE_DATA_POINTER(ctx, module_data_name) \
332 _pam_log_state_datum(ctx, 0, module_data_name, 0)
333
334 #define _PAM_LOG_STATE_DATA_STRING(ctx, module_data_name) \
335 _pam_log_state_datum(ctx, 0, module_data_name, 1)
336
337 #define _PAM_LOG_STATE_ITEM_POINTER(ctx, item_type) \
338 _pam_log_state_datum(ctx, item_type, #item_type, 0)
339
340 #define _PAM_LOG_STATE_ITEM_STRING(ctx, item_type) \
341 _pam_log_state_datum(ctx, item_type, #item_type, 1)
342
343 #ifdef DEBUG_PASSWORD
344 #define _LOG_PASSWORD_AS_STRING 1
345 #else
346 #define _LOG_PASSWORD_AS_STRING 0
347 #endif
348
349 #define _PAM_LOG_STATE_ITEM_PASSWORD(ctx, item_type) \
350 _pam_log_state_datum(ctx, item_type, #item_type, \
351 _LOG_PASSWORD_AS_STRING)
352
353 static void _pam_log_state(struct pwb_context *ctx)
354 {
355 if (!_pam_log_is_debug_state_enabled(ctx->ctrl)) {
356 return;
357 }
358
359 _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_SERVICE);
360 _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER);
361 _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_TTY);
362 _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RHOST);
363 _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RUSER);
364 _PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_OLDAUTHTOK);
365 _PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_AUTHTOK);
366 _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER_PROMPT);
367 _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_CONV);
368 #ifdef PAM_FAIL_DELAY
369 _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_FAIL_DELAY);
370 #endif
371 #ifdef PAM_REPOSITORY
372 _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_REPOSITORY);
373 #endif
374
375 _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_HOMEDIR);
376 _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSCRIPT);
377 _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSERVER);
378 _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_PROFILEPATH);
379 _PAM_LOG_STATE_DATA_STRING(ctx,
380 PAM_WINBIND_NEW_AUTHTOK_REQD);
381 /* Use atoi to get PAM result code */
382 _PAM_LOG_STATE_DATA_STRING(ctx,
383 PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH);
384 _PAM_LOG_STATE_DATA_POINTER(ctx, PAM_WINBIND_PWD_LAST_SET);
385 }
386
387 static int _pam_parse(const pam_handle_t *pamh,
388 int flags,
389 int argc,
390 const char **argv,
391 dictionary **result_d)
392 {
393 int ctrl = 0;
394 const char *config_file = NULL;
395 int i;
396 const char **v;
397 dictionary *d = NULL;
398
399 if (flags & PAM_SILENT) {
400 ctrl |= WINBIND_SILENT;
401 }
402
403 for (i=argc,v=argv; i-- > 0; ++v) {
404 if (!strncasecmp(*v, "config", strlen("config"))) {
405 ctrl |= WINBIND_CONFIG_FILE;
406 config_file = v[i];
407 break;
408 }
409 }
410
411 if (config_file == NULL) {
412 config_file = PAM_WINBIND_CONFIG_FILE;
413 }
414
415 d = iniparser_load(discard_const_p(char, config_file));
416 if (d == NULL) {
417 goto config_from_pam;
418 }
419
420 if (iniparser_getboolean(d, discard_const_p(char, "global:debug"), false)) {
421 ctrl |= WINBIND_DEBUG_ARG;
422 }
423
424 if (iniparser_getboolean(d, discard_const_p(char, "global:debug_state"), false)) {
425 ctrl |= WINBIND_DEBUG_STATE;
426 }
427
428 if (iniparser_getboolean(d, discard_const_p(char, "global:cached_login"), false)) {
429 ctrl |= WINBIND_CACHED_LOGIN;
430 }
431
432 if (iniparser_getboolean(d, discard_const_p(char, "global:krb5_auth"), false)) {
433 ctrl |= WINBIND_KRB5_AUTH;
434 }
435
436 if (iniparser_getboolean(d, discard_const_p(char, "global:silent"), false)) {
437 ctrl |= WINBIND_SILENT;
438 }
439
440 if (iniparser_getstring(d, discard_const_p(char, "global:krb5_ccache_type"), NULL) != NULL) {
441 ctrl |= WINBIND_KRB5_CCACHE_TYPE;
442 }
443
444 if ((iniparser_getstring(d, discard_const_p(char, "global:require-membership-of"), NULL)
445 != NULL) ||
446 (iniparser_getstring(d, discard_const_p(char, "global:require_membership_of"), NULL)
447 != NULL)) {
448 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
449 }
450
451 if (iniparser_getboolean(d, discard_const_p(char, "global:try_first_pass"), false)) {
452 ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
453 }
454
455 if (iniparser_getint(d, discard_const_p(char, "global:warn_pwd_expire"), 0)) {
456 ctrl |= WINBIND_WARN_PWD_EXPIRE;
457 }
458
459 if (iniparser_getboolean(d, discard_const_p(char, "global:mkhomedir"), false)) {
460 ctrl |= WINBIND_MKHOMEDIR;
461 }
462
463 config_from_pam:
464 /* step through arguments */
465 for (i=argc,v=argv; i-- > 0; ++v) {
466
467 /* generic options */
468 if (!strcmp(*v,"debug"))
469 ctrl |= WINBIND_DEBUG_ARG;
470 else if (!strcasecmp(*v, "debug_state"))
471 ctrl |= WINBIND_DEBUG_STATE;
472 else if (!strcasecmp(*v, "silent"))
473 ctrl |= WINBIND_SILENT;
474 else if (!strcasecmp(*v, "use_authtok"))
475 ctrl |= WINBIND_USE_AUTHTOK_ARG;
476 else if (!strcasecmp(*v, "use_first_pass"))
477 ctrl |= WINBIND_USE_FIRST_PASS_ARG;
478 else if (!strcasecmp(*v, "try_first_pass"))
479 ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
480 else if (!strcasecmp(*v, "unknown_ok"))
481 ctrl |= WINBIND_UNKNOWN_OK_ARG;
482 else if (!strncasecmp(*v, "require_membership_of",
483 strlen("require_membership_of")))
484 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
485 else if (!strncasecmp(*v, "require-membership-of",
486 strlen("require-membership-of")))
487 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
488 else if (!strcasecmp(*v, "krb5_auth"))
489 ctrl |= WINBIND_KRB5_AUTH;
490 else if (!strncasecmp(*v, "krb5_ccache_type",
491 strlen("krb5_ccache_type")))
492 ctrl |= WINBIND_KRB5_CCACHE_TYPE;
493 else if (!strcasecmp(*v, "cached_login"))
494 ctrl |= WINBIND_CACHED_LOGIN;
495 else if (!strcasecmp(*v, "mkhomedir"))
496 ctrl |= WINBIND_MKHOMEDIR;
497 else {
498 __pam_log(pamh, ctrl, LOG_ERR,
499 "pam_parse: unknown option: %s", *v);
500 return -1;
501 }
502
503 }
504
505 if (result_d) {
506 *result_d = d;
507 } else {
508 if (d) {
509 iniparser_freedict(d);
510 }
511 }
512
513 return ctrl;
514 };
515
516 static int _pam_winbind_free_context(struct pwb_context *ctx)
517 {
518 if (!ctx) {
519 return 0;
520 }
521
522 if (ctx->dict) {
523 iniparser_freedict(ctx->dict);
524 }
525
526 return 0;
527 }
528
529 static int _pam_winbind_init_context(pam_handle_t *pamh,
530 int flags,
531 int argc,
532 const char **argv,
533 struct pwb_context **ctx_p)
534 {
535 struct pwb_context *r = NULL;
536
537 #ifdef HAVE_GETTEXT
538 textdomain_init();
539 #endif
540
541 r = talloc_zero(NULL, struct pwb_context);
542 if (!r) {
543 return PAM_BUF_ERR;
544 }
545
546 talloc_set_destructor(r, _pam_winbind_free_context);
547
548 r->pamh = pamh;
549 r->flags = flags;
550 r->argc = argc;
551 r->argv = argv;
552 r->ctrl = _pam_parse(pamh, flags, argc, argv, &r->dict);
553 if (r->ctrl == -1) {
554 TALLOC_FREE(r);
555 return PAM_SYSTEM_ERR;
556 }
557
558 *ctx_p = r;
559
560 return PAM_SUCCESS;
561 }
562
563 static void _pam_winbind_cleanup_func(pam_handle_t *pamh,
564 void *data,
565 int error_status)
566 {
567 int ctrl = _pam_parse(pamh, 0, 0, NULL, NULL);
568 if (_pam_log_is_debug_state_enabled(ctrl)) {
569 __pam_log_debug(pamh, ctrl, LOG_DEBUG,
570 "[pamh: %p] CLEAN: cleaning up PAM data %p "
571 "(error_status = %d)", pamh, data,
572 error_status);
573 }
574 TALLOC_FREE(data);
575 }
576
577
578 static const struct ntstatus_errors {
579 const char *ntstatus_string;
580 const char *error_string;
581 } ntstatus_errors[] = {
582 {"NT_STATUS_OK",
583 N_("Success")},
584 {"NT_STATUS_BACKUP_CONTROLLER",
585 N_("No primary Domain Controler available")},
586 {"NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
587 N_("No domain controllers found")},
588 {"NT_STATUS_NO_LOGON_SERVERS",
589 N_("No logon servers")},
590 {"NT_STATUS_PWD_TOO_SHORT",
591 N_("Password too short")},
592 {"NT_STATUS_PWD_TOO_RECENT",
593 N_("The password of this user is too recent to change")},
594 {"NT_STATUS_PWD_HISTORY_CONFLICT",
595 N_("Password is already in password history")},
596 {"NT_STATUS_PASSWORD_EXPIRED",
597 N_("Your password has expired")},
598 {"NT_STATUS_PASSWORD_MUST_CHANGE",
599 N_("You need to change your password now")},
600 {"NT_STATUS_INVALID_WORKSTATION",
601 N_("You are not allowed to logon from this workstation")},
602 {"NT_STATUS_INVALID_LOGON_HOURS",
603 N_("You are not allowed to logon at this time")},
604 {"NT_STATUS_ACCOUNT_EXPIRED",
605 N_("Your account has expired. "
606 "Please contact your System administrator")}, /* SCNR */
607 {"NT_STATUS_ACCOUNT_DISABLED",
608 N_("Your account is disabled. "
609 "Please contact your System administrator")}, /* SCNR */
610 {"NT_STATUS_ACCOUNT_LOCKED_OUT",
611 N_("Your account has been locked. "
612 "Please contact your System administrator")}, /* SCNR */
613 {"NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
614 N_("Invalid Trust Account")},
615 {"NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
616 N_("Invalid Trust Account")},
617 {"NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
618 N_("Invalid Trust Account")},
619 {"NT_STATUS_ACCESS_DENIED",
620 N_("Access is denied")},
621 {NULL, NULL}
622 };
623
624 static const char *_get_ntstatus_error_string(const char *nt_status_string)
625 {
626 int i;
627 for (i=0; ntstatus_errors[i].ntstatus_string != NULL; i++) {
628 if (!strcasecmp(ntstatus_errors[i].ntstatus_string,
629 nt_status_string)) {
630 return _(ntstatus_errors[i].error_string);
631 }
632 }
633 return NULL;
634 }
635
636 /* --- authentication management functions --- */
637
638 /* Attempt a conversation */
639
640 static int converse(const pam_handle_t *pamh,
641 int nargs,
642 struct pam_message **message,
643 struct pam_response **response)
644 {
645 int retval;
646 struct pam_conv *conv;
647
648 retval = _pam_get_item(pamh, PAM_CONV, &conv);
649 if (retval == PAM_SUCCESS) {
650 retval = conv->conv(nargs,
651 (const struct pam_message **)message,
652 response, conv->appdata_ptr);
653 }
654
655 return retval; /* propagate error status */
656 }
657
658
659 static int _make_remark(struct pwb_context *ctx,
660 int type,
661 const char *text)
662 {
663 int retval = PAM_SUCCESS;
664
665 struct pam_message *pmsg[1], msg[1];
666 struct pam_response *resp;
667
668 if (ctx->flags & WINBIND_SILENT) {
669 return PAM_SUCCESS;
670 }
671
672 pmsg[0] = &msg[0];
673 msg[0].msg = discard_const_p(char, text);
674 msg[0].msg_style = type;
675
676 resp = NULL;
677 retval = converse(ctx->pamh, 1, pmsg, &resp);
678
679 if (resp) {
680 _pam_drop_reply(resp, 1);
681 }
682 return retval;
683 }
684
685 static int _make_remark_v(struct pwb_context *ctx,
686 int type,
687 const char *format,
688 va_list args)
689 {
690 char *var;
691 int ret;
692
693 ret = vasprintf(&var, format, args);
694 if (ret < 0) {
695 _pam_log(ctx, LOG_ERR, "memory allocation failure");
696 return ret;
697 }
698
699 ret = _make_remark(ctx, type, var);
700 SAFE_FREE(var);
701 return ret;
702 }
703
704 static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
705 static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...)
706 {
707 int ret;
708 va_list args;
709
710 va_start(args, format);
711 ret = _make_remark_v(ctx, type, format, args);
712 va_end(args);
713 return ret;
714 }
715
716 static int pam_winbind_request_log(struct pwb_context *ctx,
717 int retval,
718 const char *user,
719 const char *fn)
720 {
721 switch (retval) {
722 case PAM_AUTH_ERR:
723 /* incorrect password */
724 _pam_log(ctx, LOG_WARNING, "user '%s' denied access "
725 "(incorrect password or invalid membership)", user);
726 return retval;
727 case PAM_ACCT_EXPIRED:
728 /* account expired */
729 _pam_log(ctx, LOG_WARNING, "user '%s' account expired",
730 user);
731 return retval;
732 case PAM_AUTHTOK_EXPIRED:
733 /* password expired */
734 _pam_log(ctx, LOG_WARNING, "user '%s' password expired",
735 user);
736 return retval;
737 case PAM_NEW_AUTHTOK_REQD:
738 /* new password required */
739 _pam_log(ctx, LOG_WARNING, "user '%s' new password "
740 "required", user);
741 return retval;
742 case PAM_USER_UNKNOWN:
743 /* the user does not exist */
744 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
745 user);
746 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
747 return PAM_IGNORE;
748 }
749 return retval;
750 case PAM_SUCCESS:
751 /* Otherwise, the authentication looked good */
752 if (strcmp(fn, "wbcLogonUser") == 0) {
753 _pam_log(ctx, LOG_NOTICE,
754 "user '%s' granted access", user);
755 } else {
756 _pam_log(ctx, LOG_NOTICE,
757 "user '%s' OK", user);
758 }
759 return retval;
760 default:
761 /* we don't know anything about this return value */
762 _pam_log(ctx, LOG_ERR,
763 "internal module error (retval = %s(%d), user = '%s')",
764 _pam_error_code_str(retval), retval, user);
765 return retval;
766 }
767 }
768
769 static int wbc_auth_error_to_pam_error(struct pwb_context *ctx,
770 struct wbcAuthErrorInfo *e,
771 wbcErr status,
772 const char *username,
773 const char *fn)
774 {
775 int ret = PAM_AUTH_ERR;
776
777 if (WBC_ERROR_IS_OK(status)) {
778 _pam_log_debug(ctx, LOG_DEBUG, "request %s succeeded",
779 fn);
780 ret = PAM_SUCCESS;
781 return pam_winbind_request_log(ctx, ret, username, fn);
782 }
783
784 if (e) {
785 if (e->pam_error != PAM_SUCCESS) {
786 _pam_log(ctx, LOG_ERR,
787 "request %s failed: %s, "
788 "PAM error: %s (%d), NTSTATUS: %s, "
789 "Error message was: %s",
790 fn,
791 wbcErrorString(status),
792 _pam_error_code_str(e->pam_error),
793 e->pam_error,
794 e->nt_string,
795 e->display_string);
796 ret = e->pam_error;
797 return pam_winbind_request_log(ctx, ret, username, fn);
798 }
799
800 _pam_log(ctx, LOG_ERR, "request %s failed, but PAM error 0!", fn);
801
802 ret = PAM_SERVICE_ERR;
803 return pam_winbind_request_log(ctx, ret, username, fn);
804 }
805
806 ret = wbc_error_to_pam_error(status);
807 return pam_winbind_request_log(ctx, ret, username, fn);
808 }
809
810 #if defined(HAVE_PAM_RADIO_TYPE)
811 static bool _pam_winbind_change_pwd(struct pwb_context *ctx)
812 {
813 struct pam_message msg, *pmsg;
814 struct pam_response *resp = NULL;
815 const char *prompt;
816 int ret;
817 bool retval = false;
818 prompt = _("Do you want to change your password now?");
819 pmsg = &msg;
820 msg.msg_style = PAM_RADIO_TYPE;
821 msg.msg = prompt;
822 ret = converse(ctx->pamh, 1, &pmsg, &resp);
823 if (resp == NULL) {
824 if (ret == PAM_SUCCESS) {
825 _pam_log(ctx, LOG_CRIT, "pam_winbind: system error!\n");
826 return false;
827 }
828 }
829 if (ret != PAM_SUCCESS) {
830 return false;
831 }
832 _pam_log(ctx, LOG_CRIT, "Received [%s] reply from application.\n", resp->resp);
833
834 if ((resp->resp != NULL) && (strcasecmp(resp->resp, "yes") == 0)) {
835 retval = true;
836 }
837
838 _pam_drop_reply(resp, 1);
839 return retval;
840 }
841 #else
842 static bool _pam_winbind_change_pwd(struct pwb_context *ctx)
843 {
844 return false;
845 }
846 #endif
847
848 /**
849 * send a password expiry message if required
850 *
851 * @param ctx PAM winbind context.
852 * @param next_change expected (calculated) next expiry date.
853 * @param already_expired pointer to a boolean to indicate if the password is
854 * already expired.
855 *
856 * @return boolean Returns true if message has been sent, false if not.
857 */
858
859 static bool _pam_send_password_expiry_message(struct pwb_context *ctx,
860 time_t next_change,
861 time_t now,
862 int warn_pwd_expire,
863 bool *already_expired,
864 bool *change_pwd)
865 {
866 int days = 0;
867 struct tm tm_now, tm_next_change;
868 bool retval = false;
869 int ret;
870
871 if (already_expired) {
872 *already_expired = false;
873 }
874
875 if (change_pwd) {
876 *change_pwd = false;
877 }
878
879 if (next_change <= now) {
880 PAM_WB_REMARK_DIRECT(ctx, "NT_STATUS_PASSWORD_EXPIRED");
881 if (already_expired) {
882 *already_expired = true;
883 }
884 return true;
885 }
886
887 if ((next_change < 0) ||
888 (next_change > now + warn_pwd_expire * SECONDS_PER_DAY)) {
889 return false;
890 }
891
892 if ((localtime_r(&now, &tm_now) == NULL) ||
893 (localtime_r(&next_change, &tm_next_change) == NULL)) {
894 return false;
895 }
896
897 days = (tm_next_change.tm_yday+tm_next_change.tm_year*365) -
898 (tm_now.tm_yday+tm_now.tm_year*365);
899
900 if (days == 0) {
901 ret = _make_remark(ctx, PAM_TEXT_INFO,
902 _("Your password expires today.\n"));
903
904 /*
905 * If change_pwd and already_expired is null.
906 * We are just sending a notification message.
907 * We don't expect any response in this case.
908 */
909
910 if (!change_pwd && !already_expired) {
911 return true;
912 }
913
914 /*
915 * successfully sent the warning message.
916 * Give the user a chance to change pwd.
917 */
918 if (ret == PAM_SUCCESS) {
919 if (change_pwd) {
920 retval = _pam_winbind_change_pwd(ctx);
921 if (retval) {
922 *change_pwd = true;
923 }
924 }
925 }
926 return true;
927 }
928
929 if (days > 0 && days < warn_pwd_expire) {
930
931 ret = _make_remark_format(ctx, PAM_TEXT_INFO,
932 _("Your password will expire in %d %s.\n"),
933 days, (days > 1) ? _("days"):_("day"));
934 /*
935 * If change_pwd and already_expired is null.
936 * We are just sending a notification message.
937 * We don't expect any response in this case.
938 */
939
940 if (!change_pwd && !already_expired) {
941 return true;
942 }
943
944 /*
945 * successfully sent the warning message.
946 * Give the user a chance to change pwd.
947 */
948 if (ret == PAM_SUCCESS) {
949 if (change_pwd) {
950 retval = _pam_winbind_change_pwd(ctx);
951 if (retval) {
952 *change_pwd = true;
953 }
954 }
955 }
956 return true;
957 }
958
959 return false;
960 }
961
962 /**
963 * Send a warning if the password expires in the near future
964 *
965 * @param ctx PAM winbind context.
966 * @param response The full authentication response structure.
967 * @param already_expired boolean, is the pwd already expired?
968 *
969 * @return void.
970 */
971
972 static void _pam_warn_password_expiry(struct pwb_context *ctx,
973 const struct wbcAuthUserInfo *info,
974 const struct wbcUserPasswordPolicyInfo *policy,
975 int warn_pwd_expire,
976 bool *already_expired,
977 bool *change_pwd)
978 {
979 time_t now = time(NULL);
980 time_t next_change = 0;
981
982 if (!info || !policy) {
983 return;
984 }
985
986 if (already_expired) {
987 *already_expired = false;
988 }
989
990 if (change_pwd) {
991 *change_pwd = false;
992 }
993
994 /* accounts with WBC_ACB_PWNOEXP set never receive a warning */
995 if (info->acct_flags & WBC_ACB_PWNOEXP) {
996 return;
997 }
998
999 /* no point in sending a warning if this is a grace logon */
1000 if (PAM_WB_GRACE_LOGON(info->user_flags)) {
1001 return;
1002 }
1003
1004 /* check if the info3 must change timestamp has been set */
1005 next_change = info->pass_must_change_time;
1006
1007 if (_pam_send_password_expiry_message(ctx, next_change, now,
1008 warn_pwd_expire,
1009 already_expired,
1010 change_pwd)) {
1011 return;
1012 }
1013
1014 /* now check for the global password policy */
1015 /* good catch from Ralf Haferkamp: an expiry of "never" is translated
1016 * to -1 */
1017 if ((policy->expire == (int64_t)-1) ||
1018 (policy->expire == 0)) {
1019 return;
1020 }
1021
1022 next_change = info->pass_last_set_time + policy->expire;
1023
1024 if (_pam_send_password_expiry_message(ctx, next_change, now,
1025 warn_pwd_expire,
1026 already_expired,
1027 change_pwd)) {
1028 return;
1029 }
1030
1031 /* no warning sent */
1032 }
1033
1034 #define IS_SID_STRING(name) (strncmp("S-", name, 2) == 0)
1035
1036 /**
1037 * Append a string, making sure not to overflow and to always return a
1038 * NULL-terminated string.
1039 *
1040 * @param dest Destination string buffer (must already be NULL-terminated).
1041 * @param src Source string buffer.
1042 * @param dest_buffer_size Size of dest buffer in bytes.
1043 *
1044 * @return false if dest buffer is not big enough (no bytes copied), true on
1045 * success.
1046 */
1047
1048 static bool safe_append_string(char *dest,
1049 const char *src,
1050 int dest_buffer_size)
1051 {
1052 int dest_length = strlen(dest);
1053 int src_length = strlen(src);
1054
1055 if (dest_length + src_length + 1 > dest_buffer_size) {
1056 return false;
1057 }
1058
1059 memcpy(dest + dest_length, src, src_length + 1);
1060 return true;
1061 }
1062
1063 /**
1064 * Convert a names into a SID string, appending it to a buffer.
1065 *
1066 * @param ctx PAM winbind context.
1067 * @param user User in PAM request.
1068 * @param name Name to convert.
1069 * @param sid_list_buffer Where to append the string sid.
1070 * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1071 *
1072 * @return false on failure, true on success.
1073 */
1074 static bool winbind_name_to_sid_string(struct pwb_context *ctx,
1075 const char *user,
1076 const char *name,
1077 char *sid_list_buffer,
1078 int sid_list_buffer_size)
1079 {
1080 char sid_string[WBC_SID_STRING_BUFLEN];
1081
1082 /* lookup name? */
1083 if (IS_SID_STRING(name)) {
1084 strlcpy(sid_string, name, sizeof(sid_string));
1085 } else {
1086 wbcErr wbc_status;
1087 struct wbcDomainSid sid;
1088 enum wbcSidType type;
1089
1090 _pam_log_debug(ctx, LOG_DEBUG,
1091 "no sid given, looking up: %s\n", name);
1092
1093 wbc_status = wbcLookupName("", name, &sid, &type);
1094 if (!WBC_ERROR_IS_OK(wbc_status)) {
1095 _pam_log(ctx, LOG_INFO,
1096 "could not lookup name: %s\n", name);
1097 return false;
1098 }
1099
1100 wbcSidToStringBuf(&sid, sid_string, sizeof(sid_string));
1101 }
1102
1103 if (!safe_append_string(sid_list_buffer, sid_string,
1104 sid_list_buffer_size)) {
1105 return false;
1106 }
1107 return true;
1108 }
1109
1110 /**
1111 * Convert a list of names into a list of sids.
1112 *
1113 * @param ctx PAM winbind context.
1114 * @param user User in PAM request.
1115 * @param name_list List of names or string sids, separated by commas.
1116 * @param sid_list_buffer Where to put the list of string sids.
1117 * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1118 *
1119 * @return false on failure, true on success.
1120 */
1121 static bool winbind_name_list_to_sid_string_list(struct pwb_context *ctx,
1122 const char *user,
1123 const char *name_list,
1124 char *sid_list_buffer,
1125 int sid_list_buffer_size)
1126 {
1127 bool result = false;
1128 char *current_name = NULL;
1129 const char *search_location;
1130 const char *comma;
1131 int len;
1132
1133 if (sid_list_buffer_size > 0) {
1134 sid_list_buffer[0] = 0;
1135 }
1136
1137 search_location = name_list;
1138 while ((comma = strchr(search_location, ',')) != NULL) {
1139 current_name = strndup(search_location,
1140 comma - search_location);
1141 if (NULL == current_name) {
1142 goto out;
1143 }
1144
1145 if (!winbind_name_to_sid_string(ctx, user,
1146 current_name,
1147 sid_list_buffer,
1148 sid_list_buffer_size)) {
1149 /*
1150 * If one group name failed, we must not fail
1151 * the authentication totally, continue with
1152 * the following group names. If user belongs to
1153 * one of the valid groups, we must allow it
1154 * login. -- BoYang
1155 */
1156
1157 _pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
1158 "check if group %s is valid group.", current_name,
1159 current_name);
1160 _make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
1161 "to sid, please contact your administrator to see "
1162 "if group %s is valid."), current_name, current_name);
1163 SAFE_FREE(current_name);
1164 search_location = comma + 1;
1165 continue;
1166 }
1167
1168 SAFE_FREE(current_name);
1169
1170 if (!safe_append_string(sid_list_buffer, ",",
1171 sid_list_buffer_size)) {
1172 goto out;
1173 }
1174
1175 search_location = comma + 1;
1176 }
1177
1178 if (!winbind_name_to_sid_string(ctx, user, search_location,
1179 sid_list_buffer,
1180 sid_list_buffer_size)) {
1181 _pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
1182 "check if group %s is valid group.", search_location,
1183 search_location);
1184 _make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
1185 "to sid, please contact your administrator to see "
1186 "if group %s is valid."), search_location, search_location);
1187 /*
1188 * The lookup of the last name failed..
1189 * It results in require_member_of_sid ends with ','
1190 * It is malformated parameter here, overwrite the last ','.
1191 */
1192 len = strlen(sid_list_buffer);
1193 if ((len != 0) && (sid_list_buffer[len - 1] == ',')) {
1194 sid_list_buffer[len - 1] = '\0';
1195 }
1196 }
1197
1198 result = true;
1199
1200 out:
1201 SAFE_FREE(current_name);
1202 return result;
1203 }
1204
1205 /**
1206 * put krb5ccname variable into environment
1207 *
1208 * @param ctx PAM winbind context.
1209 * @param krb5ccname env variable retrieved from winbindd.
1210 *
1211 * @return void.
1212 */
1213
1214 static void _pam_setup_krb5_env(struct pwb_context *ctx,
1215 struct wbcLogonUserInfo *info)
1216 {
1217 char *var = NULL;
1218 int ret;
1219 uint32_t i;
1220 const char *krb5ccname = NULL;
1221
1222 if (off(ctx->ctrl, WINBIND_KRB5_AUTH)) {
1223 return;
1224 }
1225
1226 if (!info) {
1227 return;
1228 }
1229
1230 for (i=0; i < info->num_blobs; i++) {
1231 if (strcasecmp(info->blobs[i].name, "krb5ccname") == 0) {
1232 krb5ccname = (const char *)info->blobs[i].blob.data;
1233 break;
1234 }
1235 }
1236
1237 if (!krb5ccname || (strlen(krb5ccname) == 0)) {
1238 return;
1239 }
1240
1241 _pam_log_debug(ctx, LOG_DEBUG,
1242 "request returned KRB5CCNAME: %s", krb5ccname);
1243
1244 if (asprintf(&var, "KRB5CCNAME=%s", krb5ccname) == -1) {
1245 return;
1246 }
1247
1248 ret = pam_putenv(ctx->pamh, var);
1249 if (ret) {
1250 _pam_log(ctx, LOG_ERR,
1251 "failed to set KRB5CCNAME to %s: %s",
1252 var, pam_strerror(ctx->pamh, ret));
1253 }
1254 free(var);
1255 }
1256
1257 /**
1258 * Copy unix username if available (further processed in PAM).
1259 *
1260 * @param ctx PAM winbind context
1261 * @param user_ret A pointer that holds a pointer to a string
1262 * @param unix_username A username
1263 *
1264 * @return void.
1265 */
1266
1267 static void _pam_setup_unix_username(struct pwb_context *ctx,
1268 char **user_ret,
1269 struct wbcLogonUserInfo *info)
1270 {
1271 const char *unix_username = NULL;
1272 uint32_t i;
1273
1274 if (!user_ret || !info) {
1275 return;
1276 }
1277
1278 for (i=0; i < info->num_blobs; i++) {
1279 if (strcasecmp(info->blobs[i].name, "unix_username") == 0) {
1280 unix_username = (const char *)info->blobs[i].blob.data;
1281 break;
1282 }
1283 }
1284
1285 if (!unix_username || !unix_username[0]) {
1286 return;
1287 }
1288
1289 *user_ret = strdup(unix_username);
1290 }
1291
1292 /**
1293 * Set string into the PAM stack.
1294 *
1295 * @param ctx PAM winbind context.
1296 * @param data_name Key name for pam_set_data.
1297 * @param value String value.
1298 *
1299 * @return void.
1300 */
1301
1302 static void _pam_set_data_string(struct pwb_context *ctx,
1303 const char *data_name,
1304 const char *value)
1305 {
1306 int ret;
1307
1308 if (!data_name || !value || (strlen(data_name) == 0) ||
1309 (strlen(value) == 0)) {
1310 return;
1311 }
1312
1313 ret = pam_set_data(ctx->pamh, data_name, talloc_strdup(NULL, value),
1314 _pam_winbind_cleanup_func);
1315 if (ret) {
1316 _pam_log_debug(ctx, LOG_DEBUG,
1317 "Could not set data %s: %s\n",
1318 data_name, pam_strerror(ctx->pamh, ret));
1319 }
1320 }
1321
1322 /**
1323 * Set info3 strings into the PAM stack.
1324 *
1325 * @param ctx PAM winbind context.
1326 * @param data_name Key name for pam_set_data.
1327 * @param value String value.
1328 *
1329 * @return void.
1330 */
1331
1332 static void _pam_set_data_info3(struct pwb_context *ctx,
1333 const struct wbcAuthUserInfo *info)
1334 {
1335 _pam_set_data_string(ctx, PAM_WINBIND_HOMEDIR,
1336 info->home_directory);
1337 _pam_set_data_string(ctx, PAM_WINBIND_LOGONSCRIPT,
1338 info->logon_script);
1339 _pam_set_data_string(ctx, PAM_WINBIND_LOGONSERVER,
1340 info->logon_server);
1341 _pam_set_data_string(ctx, PAM_WINBIND_PROFILEPATH,
1342 info->profile_path);
1343 }
1344
1345 /**
1346 * Free info3 strings in the PAM stack.
1347 *
1348 * @param pamh PAM handle
1349 *
1350 * @return void.
1351 */
1352
1353 static void _pam_free_data_info3(pam_handle_t *pamh)
1354 {
1355 pam_set_data(pamh, PAM_WINBIND_HOMEDIR, NULL, NULL);
1356 pam_set_data(pamh, PAM_WINBIND_LOGONSCRIPT, NULL, NULL);
1357 pam_set_data(pamh, PAM_WINBIND_LOGONSERVER, NULL, NULL);
1358 pam_set_data(pamh, PAM_WINBIND_PROFILEPATH, NULL, NULL);
1359 }
1360
1361 /**
1362 * Send PAM_ERROR_MSG for cached or grace logons.
1363 *
1364 * @param ctx PAM winbind context.
1365 * @param username User in PAM request.
1366 * @param info3_user_flgs Info3 flags containing logon type bits.
1367 *
1368 * @return void.
1369 */
1370
1371 static void _pam_warn_logon_type(struct pwb_context *ctx,
1372 const char *username,
1373 uint32_t info3_user_flgs)
1374 {
1375 /* inform about logon type */
1376 if (PAM_WB_GRACE_LOGON(info3_user_flgs)) {
1377
1378 _make_remark(ctx, PAM_ERROR_MSG,
1379 _("Grace login. "
1380 "Please change your password as soon you're "
1381 "online again"));
1382 _pam_log_debug(ctx, LOG_DEBUG,
1383 "User %s logged on using grace logon\n",
1384 username);
1385
1386 } else if (PAM_WB_CACHED_LOGON(info3_user_flgs)) {
1387
1388 _make_remark(ctx, PAM_ERROR_MSG,
1389 _("Domain Controller unreachable, "
1390 "using cached credentials instead. "
1391 "Network resources may be unavailable"));
1392 _pam_log_debug(ctx, LOG_DEBUG,
1393 "User %s logged on using cached credentials\n",
1394 username);
1395 }
1396 }
1397
1398 /**
1399 * Send PAM_ERROR_MSG for krb5 errors.
1400 *
1401 * @param ctx PAM winbind context.
1402 * @param username User in PAM request.
1403 * @param info3_user_flgs Info3 flags containing logon type bits.
1404 *
1405 * @return void.
1406 */
1407
1408 static void _pam_warn_krb5_failure(struct pwb_context *ctx,
1409 const char *username,
1410 uint32_t info3_user_flgs)
1411 {
1412 if (PAM_WB_KRB5_CLOCK_SKEW(info3_user_flgs)) {
1413 _make_remark(ctx, PAM_ERROR_MSG,
1414 _("Failed to establish your Kerberos Ticket cache "
1415 "due time differences\n"
1416 "with the domain controller. "
1417 "Please verify the system time.\n"));
1418 _pam_log_debug(ctx, LOG_DEBUG,
1419 "User %s: Clock skew when getting Krb5 TGT\n",
1420 username);
1421 }
1422 }
1423
1424 static bool _pam_check_remark_auth_err(struct pwb_context *ctx,
1425 const struct wbcAuthErrorInfo *e,
1426 const char *nt_status_string,
1427 int *pam_err)
1428 {
1429 const char *ntstatus = NULL;
1430 const char *error_string = NULL;
1431
1432 if (!e || !pam_err) {
1433 return false;
1434 }
1435
1436 ntstatus = e->nt_string;
1437 if (!ntstatus) {
1438 return false;
1439 }
1440
1441 if (strcasecmp(ntstatus, nt_status_string) == 0) {
1442
1443 error_string = _get_ntstatus_error_string(nt_status_string);
1444 if (error_string) {
1445 _make_remark(ctx, PAM_ERROR_MSG, error_string);
1446 *pam_err = e->pam_error;
1447 return true;
1448 }
1449
1450 if (e->display_string) {
1451 _make_remark(ctx, PAM_ERROR_MSG, _(e->display_string));
1452 *pam_err = e->pam_error;
1453 return true;
1454 }
1455
1456 _make_remark(ctx, PAM_ERROR_MSG, nt_status_string);
1457 *pam_err = e->pam_error;
1458
1459 return true;
1460 }
1461
1462 return false;
1463 };
1464
1465 /**
1466 * Compose Password Restriction String for a PAM_ERROR_MSG conversation.
1467 *
1468 * @param i The wbcUserPasswordPolicyInfo struct.
1469 *
1470 * @return string (caller needs to talloc_free).
1471 */
1472
1473 static char *_pam_compose_pwd_restriction_string(struct pwb_context *ctx,
1474 struct wbcUserPasswordPolicyInfo *i)
1475 {
1476 char *str = NULL;
1477
1478 if (!i) {
1479 goto failed;
1480 }
1481
1482 str = talloc_asprintf(ctx, _("Your password "));
1483 if (!str) {
1484 goto failed;
1485 }
1486
1487 if (i->min_length_password > 0) {
1488 str = talloc_asprintf_append(str,
1489 _("must be at least %d characters; "),
1490 i->min_length_password);
1491 if (!str) {
1492 goto failed;
1493 }
1494 }
1495
1496 if (i->password_history > 0) {
1497 str = talloc_asprintf_append(str,
1498 _("cannot repeat any of your previous %d "
1499 "passwords; "),
1500 i->password_history);
1501 if (!str) {
1502 goto failed;
1503 }
1504 }
1505
1506 if (i->password_properties & WBC_DOMAIN_PASSWORD_COMPLEX) {
1507 str = talloc_asprintf_append(str,
1508 _("must contain capitals, numerals "
1509 "or punctuation; "
1510 "and cannot contain your account "
1511 "or full name; "));
1512 if (!str) {
1513 goto failed;
1514 }
1515 }
1516
1517 str = talloc_asprintf_append(str,
1518 _("Please type a different password. "
1519 "Type a password which meets these requirements in "
1520 "both text boxes."));
1521 if (!str) {
1522 goto failed;
1523 }
1524
1525 return str;
1526
1527 failed:
1528 TALLOC_FREE(str);
1529 return NULL;
1530 }
1531
1532 static int _pam_create_homedir(struct pwb_context *ctx,
1533 const char *dirname,
1534 mode_t mode)
1535 {
1536 struct stat sbuf;
1537
1538 if (stat(dirname, &sbuf) == 0) {
1539 return PAM_SUCCESS;
1540 }
1541
1542 if (mkdir(dirname, mode) != 0) {
1543
1544 _make_remark_format(ctx, PAM_TEXT_INFO,
1545 _("Creating directory: %s failed: %s"),
1546 dirname, strerror(errno));
1547 _pam_log(ctx, LOG_ERR, "could not create dir: %s (%s)",
1548 dirname, strerror(errno));
1549 return PAM_PERM_DENIED;
1550 }
1551
1552 return PAM_SUCCESS;
1553 }
1554
1555 static int _pam_chown_homedir(struct pwb_context *ctx,
1556 const char *dirname,
1557 uid_t uid,
1558 gid_t gid)
1559 {
1560 if (chown(dirname, uid, gid) != 0) {
1561 _pam_log(ctx, LOG_ERR, "failed to chown user homedir: %s (%s)",
1562 dirname, strerror(errno));
1563 return PAM_PERM_DENIED;
1564 }
1565
1566 return PAM_SUCCESS;
1567 }
1568
1569 static int _pam_mkhomedir(struct pwb_context *ctx)
1570 {
1571 struct passwd *pwd = NULL;
1572 char *token = NULL;
1573 char *create_dir = NULL;
1574 char *user_dir = NULL;
1575 int ret;
1576 const char *username;
1577 mode_t mode = 0700;
1578 char *safe_ptr = NULL;
1579 char *p = NULL;
1580
1581 /* Get the username */
1582 ret = pam_get_user(ctx->pamh, &username, NULL);
1583 if ((ret != PAM_SUCCESS) || (!username)) {
1584 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1585 return PAM_SERVICE_ERR;
1586 }
1587
1588 pwd = getpwnam(username);
1589 if (pwd == NULL) {
1590 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1591 return PAM_USER_UNKNOWN;
1592 }
1593 _pam_log_debug(ctx, LOG_DEBUG, "homedir is: %s", pwd->pw_dir);
1594
1595 ret = _pam_create_homedir(ctx, pwd->pw_dir, 0700);
1596 if (ret == PAM_SUCCESS) {
1597 ret = _pam_chown_homedir(ctx, pwd->pw_dir,
1598 pwd->pw_uid,
1599 pwd->pw_gid);
1600 }
1601
1602 if (ret == PAM_SUCCESS) {
1603 return ret;
1604 }
1605
1606 /* maybe we need to create parent dirs */
1607 create_dir = talloc_strdup(ctx, "/");
1608 if (!create_dir) {
1609 return PAM_BUF_ERR;
1610 }
1611
1612 /* find final directory */
1613 user_dir = strrchr(pwd->pw_dir, '/');
1614 if (!user_dir) {
1615 return PAM_BUF_ERR;
1616 }
1617 user_dir++;
1618
1619 _pam_log(ctx, LOG_DEBUG, "final directory: %s", user_dir);
1620
1621 p = pwd->pw_dir;
1622
1623 while ((token = strtok_r(p, "/", &safe_ptr)) != NULL) {
1624
1625 mode = 0755;
1626
1627 p = NULL;
1628
1629 _pam_log_debug(ctx, LOG_DEBUG, "token is %s", token);
1630
1631 create_dir = talloc_asprintf_append(create_dir, "%s/", token);
1632 if (!create_dir) {
1633 return PAM_BUF_ERR;
1634 }
1635 _pam_log_debug(ctx, LOG_DEBUG, "current_dir is %s", create_dir);
1636
1637 if (strcmp(token, user_dir) == 0) {
1638 _pam_log_debug(ctx, LOG_DEBUG, "assuming last directory: %s", token);
1639 mode = 0700;
1640 }
1641
1642 ret = _pam_create_homedir(ctx, create_dir, mode);
1643 if (ret) {
1644 return ret;
1645 }
1646 }
1647
1648 return _pam_chown_homedir(ctx, create_dir,
1649 pwd->pw_uid,
1650 pwd->pw_gid);
1651 }
1652
1653 /* talk to winbindd */
1654 static int winbind_auth_request(struct pwb_context *ctx,
1655 const char *user,
1656 const char *pass,
1657 const char *member,
1658 const char *cctype,
1659 const int warn_pwd_expire,
1660 struct wbcAuthErrorInfo **p_error,
1661 struct wbcLogonUserInfo **p_info,
1662 struct wbcUserPasswordPolicyInfo **p_policy,
1663 time_t *pwd_last_set,
1664 char **user_ret)
1665 {
1666 wbcErr wbc_status;
1667
1668 struct wbcLogonUserParams logon;
1669 char membership_of[1024];
1670 uid_t user_uid = -1;
1671 uint32_t flags = WBFLAG_PAM_INFO3_TEXT |
1672 WBFLAG_PAM_GET_PWD_POLICY;
1673
1674 struct wbcLogonUserInfo *info = NULL;
1675 struct wbcAuthUserInfo *user_info = NULL;
1676 struct wbcAuthErrorInfo *error = NULL;
1677 struct wbcUserPasswordPolicyInfo *policy = NULL;
1678
1679 int ret = PAM_AUTH_ERR;
1680 int i;
1681 const char *codes[] = {
1682 "NT_STATUS_PASSWORD_EXPIRED",
1683 "NT_STATUS_PASSWORD_MUST_CHANGE",
1684 "NT_STATUS_INVALID_WORKSTATION",
1685 "NT_STATUS_INVALID_LOGON_HOURS",
1686 "NT_STATUS_ACCOUNT_EXPIRED",
1687 "NT_STATUS_ACCOUNT_DISABLED",
1688 "NT_STATUS_ACCOUNT_LOCKED_OUT",
1689 "NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
1690 "NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
1691 "NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
1692 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1693 "NT_STATUS_NO_LOGON_SERVERS",
1694 "NT_STATUS_WRONG_PASSWORD",
1695 "NT_STATUS_ACCESS_DENIED"
1696 };
1697
1698 if (pwd_last_set) {
1699 *pwd_last_set = 0;
1700 }
1701
1702 /* Krb5 auth always has to go against the KDC of the user's realm */
1703
1704 if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1705 flags |= WBFLAG_PAM_CONTACT_TRUSTDOM;
1706 }
1707
1708 if (ctx->ctrl & (WINBIND_KRB5_AUTH|WINBIND_CACHED_LOGIN)) {
1709 struct passwd *pwd = NULL;
1710
1711 pwd = getpwnam(user);
1712 if (pwd == NULL) {
1713 return PAM_USER_UNKNOWN;
1714 }
1715 user_uid = pwd->pw_uid;
1716 }
1717
1718 if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1719
1720 _pam_log_debug(ctx, LOG_DEBUG,
1721 "enabling krb5 login flag\n");
1722
1723 flags |= WBFLAG_PAM_KRB5 |
1724 WBFLAG_PAM_FALLBACK_AFTER_KRB5;
1725 }
1726
1727 if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1728 _pam_log_debug(ctx, LOG_DEBUG,
1729 "enabling cached login flag\n");
1730 flags |= WBFLAG_PAM_CACHED_LOGIN;
1731 }
1732
1733 if (user_ret) {
1734 *user_ret = NULL;
1735 flags |= WBFLAG_PAM_UNIX_NAME;
1736 }
1737
1738 if (cctype != NULL) {
1739 _pam_log_debug(ctx, LOG_DEBUG,
1740 "enabling request for a %s krb5 ccache\n",
1741 cctype);
1742 }
1743
1744 if (member != NULL) {
1745
1746 ZERO_STRUCT(membership_of);
1747
1748 if (!winbind_name_list_to_sid_string_list(ctx, user, member,
1749 membership_of,
1750 sizeof(membership_of))) {
1751 _pam_log_debug(ctx, LOG_ERR,
1752 "failed to serialize membership of sid "
1753 "\"%s\"\n", member);
1754 return PAM_AUTH_ERR;
1755 }
1756 }
1757
1758 ZERO_STRUCT(logon);
1759
1760 logon.username = user;
1761 logon.password = pass;
1762
1763 if (cctype) {
1764 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1765 &logon.blobs,
1766 "krb5_cc_type",
1767 0,
1768 discard_const_p(uint8_t, cctype),
1769 strlen(cctype)+1);
1770 if (!WBC_ERROR_IS_OK(wbc_status)) {
1771 goto done;
1772 }
1773 }
1774
1775 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1776 &logon.blobs,
1777 "flags",
1778 0,
1779 (uint8_t *)&flags,
1780 sizeof(flags));
1781 if (!WBC_ERROR_IS_OK(wbc_status)) {
1782 goto done;
1783 }
1784
1785 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1786 &logon.blobs,
1787 "user_uid",
1788 0,
1789 (uint8_t *)&user_uid,
1790 sizeof(user_uid));
1791 if (!WBC_ERROR_IS_OK(wbc_status)) {
1792 goto done;
1793 }
1794
1795 if (member) {
1796 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1797 &logon.blobs,
1798 "membership_of",
1799 0,
1800 (uint8_t *)membership_of,
1801 sizeof(membership_of));
1802 if (!WBC_ERROR_IS_OK(wbc_status)) {
1803 goto done;
1804 }
1805 }
1806
1807 wbc_status = wbcLogonUser(&logon, &info, &error, &policy);
1808 ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1809 user, "wbcLogonUser");
1810 wbcFreeMemory(logon.blobs);
1811 logon.blobs = NULL;
1812
1813 if (info && info->info) {
1814 user_info = info->info;
1815 }
1816
1817 if (pwd_last_set && user_info) {
1818 *pwd_last_set = user_info->pass_last_set_time;
1819 }
1820
1821 if (p_info && info) {
1822 *p_info = info;
1823 }
1824
1825 if (p_policy && policy) {
1826 *p_policy = policy;
1827 }
1828
1829 if (p_error && error) {
1830 /* We want to process the error in the caller. */
1831 *p_error = error;
1832 return ret;
1833 }
1834
1835 for (i=0; i<ARRAY_SIZE(codes); i++) {
1836 int _ret = ret;
1837 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1838 ret = _ret;
1839 goto done;
1840 }
1841 }
1842
1843 if ((ret == PAM_SUCCESS) && user_info && policy && info) {
1844
1845 bool already_expired = false;
1846 bool change_pwd = false;
1847
1848 /* warn a user if the password is about to expire soon */
1849 _pam_warn_password_expiry(ctx, user_info, policy,
1850 warn_pwd_expire,
1851 &already_expired,
1852 &change_pwd);
1853
1854 if (already_expired == true) {
1855
1856 SMB_TIME_T last_set = user_info->pass_last_set_time;
1857
1858 _pam_log_debug(ctx, LOG_DEBUG,
1859 "Password has expired "
1860 "(Password was last set: %lld, "
1861 "the policy says it should expire here "
1862 "%lld (now it's: %ld))\n",
1863 (long long int)last_set,
1864 (long long int)last_set +
1865 policy->expire,
1866 (long)time(NULL));
1867
1868 return PAM_AUTHTOK_EXPIRED;
1869 }
1870
1871 if (change_pwd) {
1872 ret = PAM_NEW_AUTHTOK_REQD;
1873 goto done;
1874 }
1875
1876 /* inform about logon type */
1877 _pam_warn_logon_type(ctx, user, user_info->user_flags);
1878
1879 /* inform about krb5 failures */
1880 _pam_warn_krb5_failure(ctx, user, user_info->user_flags);
1881
1882 /* set some info3 info for other modules in the stack */
1883 _pam_set_data_info3(ctx, user_info);
1884
1885 /* put krb5ccname into env */
1886 _pam_setup_krb5_env(ctx, info);
1887
1888 /* If winbindd returned a username, return the pointer to it
1889 * here. */
1890 _pam_setup_unix_username(ctx, user_ret, info);
1891 }
1892
1893 done:
1894 wbcFreeMemory(logon.blobs);
1895 if (info && info->blobs && !p_info) {
1896 wbcFreeMemory(info->blobs);
1897 }
1898 if (error && !p_error) {
1899 wbcFreeMemory(error);
1900 }
1901 if (info && !p_info) {
1902 wbcFreeMemory(info);
1903 }
1904 if (policy && !p_policy) {
1905 wbcFreeMemory(policy);
1906 }
1907
1908 return ret;
1909 }
1910
1911 /* talk to winbindd */
1912 static int winbind_chauthtok_request(struct pwb_context *ctx,
1913 const char *user,
1914 const char *oldpass,
1915 const char *newpass,
1916 time_t pwd_last_set)
1917 {
1918 wbcErr wbc_status;
1919 struct wbcChangePasswordParams params;
1920 struct wbcAuthErrorInfo *error = NULL;
1921 struct wbcUserPasswordPolicyInfo *policy = NULL;
1922 enum wbcPasswordChangeRejectReason reject_reason = -1;
1923 uint32_t flags = 0;
1924
1925 int i;
1926 const char *codes[] = {
1927 "NT_STATUS_BACKUP_CONTROLLER",
1928 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1929 "NT_STATUS_NO_LOGON_SERVERS",
1930 "NT_STATUS_ACCESS_DENIED",
1931 "NT_STATUS_PWD_TOO_SHORT", /* TODO: tell the min pwd length ? */
1932 "NT_STATUS_PWD_TOO_RECENT", /* TODO: tell the minage ? */
1933 "NT_STATUS_PWD_HISTORY_CONFLICT" /* TODO: tell the history length ? */
1934 };
1935 int ret = PAM_AUTH_ERR;
1936
1937 ZERO_STRUCT(params);
1938
1939 if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1940 flags |= WBFLAG_PAM_KRB5 |
1941 WBFLAG_PAM_CONTACT_TRUSTDOM;
1942 }
1943
1944 if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1945 flags |= WBFLAG_PAM_CACHED_LOGIN;
1946 }
1947
1948 params.account_name = user;
1949 params.level = WBC_CHANGE_PASSWORD_LEVEL_PLAIN;
1950 params.old_password.plaintext = oldpass;
1951 params.new_password.plaintext = newpass;
1952 params.flags = flags;
1953
1954 wbc_status = wbcChangeUserPasswordEx(&params, &error, &reject_reason, &policy);
1955 ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1956 user, "wbcChangeUserPasswordEx");
1957
1958 if (WBC_ERROR_IS_OK(wbc_status)) {
1959 _pam_log(ctx, LOG_NOTICE,
1960 "user '%s' password changed", user);
1961 return PAM_SUCCESS;
1962 }
1963
1964 if (!error) {
1965 wbcFreeMemory(policy);
1966 return ret;
1967 }
1968
1969 for (i=0; i<ARRAY_SIZE(codes); i++) {
1970 int _ret = ret;
1971 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1972 ret = _ret;
1973 goto done;
1974 }
1975 }
1976
1977 if (!strcasecmp(error->nt_string,
1978 "NT_STATUS_PASSWORD_RESTRICTION")) {
1979
1980 char *pwd_restriction_string = NULL;
1981 SMB_TIME_T min_pwd_age = 0;
1982
1983 if (policy) {
1984 min_pwd_age = policy->min_passwordage;
1985 }
1986
1987 /* FIXME: avoid to send multiple PAM messages after another */
1988 switch (reject_reason) {
1989 case -1:
1990 break;
1991 case WBC_PWD_CHANGE_NO_ERROR:
1992 if ((min_pwd_age > 0) &&
1993 (pwd_last_set + min_pwd_age > time(NULL))) {
1994 PAM_WB_REMARK_DIRECT(ctx,
1995 "NT_STATUS_PWD_TOO_RECENT");
1996 }
1997 break;
1998 case WBC_PWD_CHANGE_PASSWORD_TOO_SHORT:
1999 PAM_WB_REMARK_DIRECT(ctx,
2000 "NT_STATUS_PWD_TOO_SHORT");
2001 break;
2002 case WBC_PWD_CHANGE_PWD_IN_HISTORY:
2003 PAM_WB_REMARK_DIRECT(ctx,
2004 "NT_STATUS_PWD_HISTORY_CONFLICT");
2005 break;
2006 case WBC_PWD_CHANGE_NOT_COMPLEX:
2007 _make_remark(ctx, PAM_ERROR_MSG,
2008 _("Password does not meet "
2009 "complexity requirements"));
2010 break;
2011 default:
2012 _pam_log_debug(ctx, LOG_DEBUG,
2013 "unknown password change "
2014 "reject reason: %d",
2015 reject_reason);
2016 break;
2017 }
2018
2019 pwd_restriction_string =
2020 _pam_compose_pwd_restriction_string(ctx, policy);
2021 if (pwd_restriction_string) {
2022 _make_remark(ctx, PAM_ERROR_MSG,
2023 pwd_restriction_string);
2024 TALLOC_FREE(pwd_restriction_string);
2025 }
2026 }
2027 done:
2028 wbcFreeMemory(error);
2029 wbcFreeMemory(policy);
2030
2031 return ret;
2032 }
2033
2034 /*
2035 * Checks if a user has an account
2036 *
2037 * return values:
2038 * 1 = User not found
2039 * 0 = OK
2040 * -1 = System error
2041 */
2042 static int valid_user(struct pwb_context *ctx,
2043 const char *user)
2044 {
2045 /* check not only if the user is available over NSS calls, also make
2046 * sure it's really a winbind user, this is important when stacking PAM
2047 * modules in the 'account' or 'password' facility. */
2048
2049 wbcErr wbc_status;
2050 struct passwd *pwd = NULL;
2051 struct passwd *wb_pwd = NULL;
2052
2053 pwd = getpwnam(user);
2054 if (pwd == NULL) {
2055 return 1;
2056 }
2057
2058 wbc_status = wbcGetpwnam(user, &wb_pwd);
2059 wbcFreeMemory(wb_pwd);
2060 if (!WBC_ERROR_IS_OK(wbc_status)) {
2061 _pam_log(ctx, LOG_DEBUG, "valid_user: wbcGetpwnam gave %s\n",
2062 wbcErrorString(wbc_status));
2063 }
2064
2065 switch (wbc_status) {
2066 case WBC_ERR_UNKNOWN_USER:
2067 /* match other insane libwbclient return codes */
2068 case WBC_ERR_WINBIND_NOT_AVAILABLE:
2069 case WBC_ERR_DOMAIN_NOT_FOUND:
2070 return 1;
2071 case WBC_ERR_SUCCESS:
2072 return 0;
2073 default:
2074 break;
2075 }
2076 return -1;
2077 }
2078
2079 static char *_pam_delete(register char *xx)
2080 {
2081 _pam_overwrite(xx);
2082 _pam_drop(xx);
2083 return NULL;
2084 }
2085
2086 /*
2087 * obtain a password from the user
2088 */
2089
2090 static int _winbind_read_password(struct pwb_context *ctx,
2091 unsigned int ctrl,
2092 const char *comment,
2093 const char *prompt1,
2094 const char *prompt2,
2095 const char **pass)
2096 {
2097 int authtok_flag;
2098 int retval;
2099 const char *item;
2100 char *token;
2101
2102 _pam_log(ctx, LOG_DEBUG, "getting password (0x%08x)", ctrl);
2103
2104 /*
2105 * make sure nothing inappropriate gets returned
2106 */
2107
2108 *pass = token = NULL;
2109
2110 /*
2111 * which authentication token are we getting?
2112 */
2113
2114 if (on(WINBIND__OLD_PASSWORD, ctrl)) {
2115 authtok_flag = PAM_OLDAUTHTOK;
2116 } else {
2117 authtok_flag = PAM_AUTHTOK;
2118 }
2119
2120 /*
2121 * should we obtain the password from a PAM item ?
2122 */
2123
2124 if (on(WINBIND_TRY_FIRST_PASS_ARG, ctrl) ||
2125 on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2126 retval = _pam_get_item(ctx->pamh, authtok_flag, &item);
2127 if (retval != PAM_SUCCESS) {
2128 /* very strange. */
2129 _pam_log(ctx, LOG_ALERT,
2130 "pam_get_item returned error "
2131 "to unix-read-password");
2132 return retval;
2133 } else if (item != NULL) { /* we have a password! */
2134 *pass = item;
2135 item = NULL;
2136 _pam_log(ctx, LOG_DEBUG,
2137 "pam_get_item returned a password");
2138 return PAM_SUCCESS;
2139 } else if (on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2140 return PAM_AUTHTOK_RECOVER_ERR; /* didn't work */
2141 } else if (on(WINBIND_USE_AUTHTOK_ARG, ctrl)
2142 && off(WINBIND__OLD_PASSWORD, ctrl)) {
2143 return PAM_AUTHTOK_RECOVER_ERR;
2144 }
2145 }
2146 /*
2147 * getting here implies we will have to get the password from the
2148 * user directly.
2149 */
2150
2151 {
2152 struct pam_message msg[3], *pmsg[3];
2153 struct pam_response *resp;
2154 int i, replies;
2155
2156 /* prepare to converse */
2157
2158 if (comment != NULL && off(ctrl, WINBIND_SILENT)) {
2159 pmsg[0] = &msg[0];
2160 msg[0].msg_style = PAM_TEXT_INFO;
2161 msg[0].msg = discard_const_p(char, comment);
2162 i = 1;
2163 } else {
2164 i = 0;
2165 }
2166
2167 pmsg[i] = &msg[i];
2168 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2169 msg[i++].msg = discard_const_p(char, prompt1);
2170 replies = 1;
2171
2172 if (prompt2 != NULL) {
2173 pmsg[i] = &msg[i];
2174 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2175 msg[i++].msg = discard_const_p(char, prompt2);
2176 ++replies;
2177 }
2178 /* so call the conversation expecting i responses */
2179 resp = NULL;
2180 retval = converse(ctx->pamh, i, pmsg, &resp);
2181 if (resp == NULL) {
2182 if (retval == PAM_SUCCESS) {
2183 retval = PAM_AUTHTOK_RECOVER_ERR;
2184 }
2185 goto done;
2186 }
2187 if (retval != PAM_SUCCESS) {
2188 _pam_drop_reply(resp, i);
2189 goto done;
2190 }
2191
2192 /* interpret the response */
2193
2194 token = x_strdup(resp[i - replies].resp);
2195 if (!token) {
2196 _pam_log(ctx, LOG_NOTICE,
2197 "could not recover "
2198 "authentication token");
2199 retval = PAM_AUTHTOK_RECOVER_ERR;
2200 goto done;
2201 }
2202
2203 if (replies == 2) {
2204 /* verify that password entered correctly */
2205 if (!resp[i - 1].resp ||
2206 strcmp(token, resp[i - 1].resp)) {
2207 _pam_delete(token); /* mistyped */
2208 retval = PAM_AUTHTOK_RECOVER_ERR;
2209 _make_remark(ctx, PAM_ERROR_MSG,
2210 MISTYPED_PASS);
2211 }
2212 }
2213
2214 /*
2215 * tidy up the conversation (resp_retcode) is ignored
2216 * -- what is it for anyway? AGM
2217 */
2218 _pam_drop_reply(resp, i);
2219 }
2220
2221 done:
2222 if (retval != PAM_SUCCESS) {
2223 _pam_log_debug(ctx, LOG_DEBUG,
2224 "unable to obtain a password");
2225 return retval;
2226 }
2227 /* 'token' is the entered password */
2228
2229 /* we store this password as an item */
2230
2231 retval = pam_set_item(ctx->pamh, authtok_flag, token);
2232 _pam_delete(token); /* clean it up */
2233 if (retval != PAM_SUCCESS ||
2234 (retval = _pam_get_item(ctx->pamh, authtok_flag, &item)) != PAM_SUCCESS) {
2235
2236 _pam_log(ctx, LOG_CRIT, "error manipulating password");
2237 return retval;
2238
2239 }
2240
2241 *pass = item;
2242 item = NULL; /* break link to password */
2243
2244 return PAM_SUCCESS;
2245 }
2246
2247 static const char *get_conf_item_string(struct pwb_context *ctx,
2248 const char *item,
2249 int config_flag)
2250 {
2251 int i = 0;
2252 const char *parm_opt = NULL;
2253
2254 if (!(ctx->ctrl & config_flag)) {
2255 goto out;
2256 }
2257
2258 /* let the pam opt take precedence over the pam_winbind.conf option */
2259 for (i=0; i<ctx->argc; i++) {
2260
2261 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2262 char *p;
2263
2264 if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2265 _pam_log(ctx, LOG_INFO,
2266 "no \"=\" delimiter for \"%s\" found\n",
2267 item);
2268 goto out;
2269 }
2270 _pam_log_debug(ctx, LOG_INFO,
2271 "PAM config: %s '%s'\n", item, p+1);
2272 return p + 1;
2273 }
2274 }
2275
2276 if (ctx->dict) {
2277 char *key = NULL;
2278
2279 key = talloc_asprintf(ctx, "global:%s", item);
2280 if (!key) {
2281 goto out;
2282 }
2283
2284 parm_opt = iniparser_getstring(ctx->dict, key, NULL);
2285 TALLOC_FREE(key);
2286
2287 _pam_log_debug(ctx, LOG_INFO, "CONFIG file: %s '%s'\n",
2288 item, parm_opt);
2289 }
2290 out:
2291 return parm_opt;
2292 }
2293
2294 static int get_config_item_int(struct pwb_context *ctx,
2295 const char *item,
2296 int config_flag)
2297 {
2298 int i, parm_opt = -1;
2299
2300 if (!(ctx->ctrl & config_flag)) {
2301 goto out;
2302 }
2303
2304 /* let the pam opt take precedence over the pam_winbind.conf option */
2305 for (i = 0; i < ctx->argc; i++) {
2306
2307 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2308 char *p;
2309
2310 if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2311 _pam_log(ctx, LOG_INFO,
2312 "no \"=\" delimiter for \"%s\" found\n",
2313 item);
2314 goto out;
2315 }
2316 parm_opt = atoi(p + 1);
2317 _pam_log_debug(ctx, LOG_INFO,
2318 "PAM config: %s '%d'\n",
2319 item, parm_opt);
2320 return parm_opt;
2321 }
2322 }
2323
2324 if (ctx->dict) {
2325 char *key = NULL;
2326
2327 key = talloc_asprintf(ctx, "global:%s", item);
2328 if (!key) {
2329 goto out;
2330 }
2331
2332 parm_opt = iniparser_getint(ctx->dict, key, -1);
2333 TALLOC_FREE(key);
2334
2335 _pam_log_debug(ctx, LOG_INFO,
2336 "CONFIG file: %s '%d'\n",
2337 item, parm_opt);
2338 }
2339 out:
2340 return parm_opt;
2341 }
2342
2343 static const char *get_krb5_cc_type_from_config(struct pwb_context *ctx)
2344 {
2345 return get_conf_item_string(ctx, "krb5_ccache_type",
2346 WINBIND_KRB5_CCACHE_TYPE);
2347 }
2348
2349 static const char *get_member_from_config(struct pwb_context *ctx)
2350 {
2351 const char *ret = NULL;
2352 ret = get_conf_item_string(ctx, "require_membership_of",
2353 WINBIND_REQUIRED_MEMBERSHIP);
2354 if (ret) {
2355 return ret;
2356 }
2357 return get_conf_item_string(ctx, "require-membership-of",
2358 WINBIND_REQUIRED_MEMBERSHIP);
2359 }
2360
2361 static int get_warn_pwd_expire_from_config(struct pwb_context *ctx)
2362 {
2363 int ret;
2364 ret = get_config_item_int(ctx, "warn_pwd_expire",
2365 WINBIND_WARN_PWD_EXPIRE);
2366 /* no or broken setting */
2367 if (ret <= 0) {
2368 return DEFAULT_DAYS_TO_WARN_BEFORE_PWD_EXPIRES;
2369 }
2370 return ret;
2371 }
2372
2373 /**
2374 * Retrieve the winbind separator.
2375 *
2376 * @param ctx PAM winbind context.
2377 *
2378 * @return string separator character. NULL on failure.
2379 */
2380
2381 static char winbind_get_separator(struct pwb_context *ctx)
2382 {
2383 wbcErr wbc_status;
2384 static struct wbcInterfaceDetails *details = NULL;
2385
2386 wbc_status = wbcInterfaceDetails(&details);
2387 if (!WBC_ERROR_IS_OK(wbc_status)) {
2388 _pam_log(ctx, LOG_ERR,
2389 "Could not retrieve winbind interface details: %s",
2390 wbcErrorString(wbc_status));
2391 return '\0';
2392 }
2393
2394 if (!details) {
2395 return '\0';
2396 }
2397
2398 return details->winbind_separator;
2399 }
2400
2401
2402 /**
2403 * Convert a upn to a name.
2404 *
2405 * @param ctx PAM winbind context.
2406 * @param upn USer UPN to be trabslated.
2407 *
2408 * @return converted name. NULL pointer on failure. Caller needs to free.
2409 */
2410
2411 static char* winbind_upn_to_username(struct pwb_context *ctx,
2412 const char *upn)
2413 {
2414 char sep;
2415 wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;
2416 struct wbcDomainSid sid;
2417 enum wbcSidType type;
2418 char *domain = NULL;
2419 char *name;
2420 char *p;
2421
2422 /* This cannot work when the winbind separator = @ */
2423
2424 sep = winbind_get_separator(ctx);
2425 if (!sep || sep == '@') {
2426 return NULL;
2427 }
2428
2429 name = talloc_strdup(ctx, upn);
2430 if (!name) {
2431 return NULL;
2432 }
2433 if ((p = strchr(name, '@')) != NULL) {
2434 *p = 0;
2435 domain = p + 1;
2436 }
2437
2438 /* Convert the UPN to a SID */
2439
2440 wbc_status = wbcLookupName(domain, name, &sid, &type);
2441 if (!WBC_ERROR_IS_OK(wbc_status)) {
2442 return NULL;
2443 }
2444
2445 /* Convert the the SID back to the sAMAccountName */
2446
2447 wbc_status = wbcLookupSid(&sid, &domain, &name, &type);
2448 if (!WBC_ERROR_IS_OK(wbc_status)) {
2449 return NULL;
2450 }
2451
2452 return talloc_asprintf(ctx, "%s\\%s", domain, name);
2453 }
2454
2455 static int _pam_delete_cred(pam_handle_t *pamh, int flags,
2456 int argc, const char **argv)
2457 {
2458 int retval = PAM_SUCCESS;
2459 struct pwb_context *ctx = NULL;
2460 struct wbcLogoffUserParams logoff;
2461 struct wbcAuthErrorInfo *error = NULL;
2462 const char *user;
2463 wbcErr wbc_status = WBC_ERR_SUCCESS;
2464
2465 ZERO_STRUCT(logoff);
2466
2467 retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2468 if (retval) {
2469 goto out;
2470 }
2471
2472 _PAM_LOG_FUNCTION_ENTER("_pam_delete_cred", ctx);
2473
2474 if (ctx->ctrl & WINBIND_KRB5_AUTH) {
2475
2476 /* destroy the ccache here */
2477
2478 uint32_t wbc_flags = 0;
2479 const char *ccname = NULL;
2480 struct passwd *pwd = NULL;
2481
2482 retval = pam_get_user(pamh, &user, _("Username: "));
2483 if (retval) {
2484 _pam_log(ctx, LOG_ERR,
2485 "could not identify user");
2486 goto out;
2487 }
2488
2489 if (user == NULL) {
2490 _pam_log(ctx, LOG_ERR,
2491 "username was NULL!");
2492 retval = PAM_USER_UNKNOWN;
2493 goto out;
2494 }
2495
2496 _pam_log_debug(ctx, LOG_DEBUG,
2497 "username [%s] obtained", user);
2498
2499 ccname = pam_getenv(pamh, "KRB5CCNAME");
2500 if (ccname == NULL) {
2501 _pam_log_debug(ctx, LOG_DEBUG,
2502 "user has no KRB5CCNAME environment");
2503 }
2504
2505 pwd = getpwnam(user);
2506 if (pwd == NULL) {
2507 retval = PAM_USER_UNKNOWN;
2508 goto out;
2509 }
2510
2511 wbc_flags = WBFLAG_PAM_KRB5 |
2512 WBFLAG_PAM_CONTACT_TRUSTDOM;
2513
2514 logoff.username = user;
2515
2516 if (ccname) {
2517 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2518 &logoff.blobs,
2519 "ccfilename",
2520 0,
2521 discard_const_p(uint8_t, ccname),
2522 strlen(ccname)+1);
2523 if (!WBC_ERROR_IS_OK(wbc_status)) {
2524 goto out;
2525 }
2526 }
2527
2528 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2529 &logoff.blobs,
2530 "flags",
2531 0,
2532 (uint8_t *)&wbc_flags,
2533 sizeof(wbc_flags));
2534 if (!WBC_ERROR_IS_OK(wbc_status)) {
2535 goto out;
2536 }
2537
2538 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2539 &logoff.blobs,
2540 "user_uid",
2541 0,
2542 (uint8_t *)&pwd->pw_uid,
2543 sizeof(pwd->pw_uid));
2544 if (!WBC_ERROR_IS_OK(wbc_status)) {
2545 goto out;
2546 }
2547
2548 wbc_status = wbcLogoffUserEx(&logoff, &error);
2549 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2550 user, "wbcLogoffUser");
2551 wbcFreeMemory(error);
2552 wbcFreeMemory(logoff.blobs);
2553 logoff.blobs = NULL;
2554
2555 if (!WBC_ERROR_IS_OK(wbc_status)) {
2556 _pam_log(ctx, LOG_INFO,
2557 "failed to logoff user %s: %s\n",
2558 user, wbcErrorString(wbc_status));
2559 }
2560 }
2561
2562 out:
2563 if (logoff.blobs) {
2564 wbcFreeMemory(logoff.blobs);
2565 }
2566
2567 if (!WBC_ERROR_IS_OK(wbc_status)) {
2568 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2569 user, "wbcLogoffUser");
2570 }
2571
2572 /*
2573 * Delete the krb5 ccname variable from the PAM environment
2574 * if it was set by winbind.
2575 */
2576 if ((ctx->ctrl & WINBIND_KRB5_AUTH) && pam_getenv(pamh, "KRB5CCNAME")) {
2577 pam_putenv(pamh, "KRB5CCNAME");
2578 }
2579
2580 _PAM_LOG_FUNCTION_LEAVE("_pam_delete_cred", ctx, retval);
2581
2582 TALLOC_FREE(ctx);
2583
2584 return retval;
2585 }
2586
2587 PAM_EXTERN
2588 int pam_sm_authenticate(pam_handle_t *pamh, int flags,
2589 int argc, const char **argv)
2590 {
2591 const char *username;
2592 const char *password;
2593 const char *member = NULL;
2594 const char *cctype = NULL;
2595 int warn_pwd_expire;
2596 int retval = PAM_AUTH_ERR;
2597 char *username_ret = NULL;
2598 char *new_authtok_required = NULL;
2599 char *real_username = NULL;
2600 struct pwb_context *ctx = NULL;
2601
2602 retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2603 if (retval) {
2604 goto out;
2605 }
2606
2607 _PAM_LOG_FUNCTION_ENTER("pam_sm_authenticate", ctx);
2608
2609 /* Get the username */
2610 retval = pam_get_user(pamh, &username, NULL);
2611 if ((retval != PAM_SUCCESS) || (!username)) {
2612 _pam_log_debug(ctx, LOG_DEBUG,
2613 "can not get the username");
2614 retval = PAM_SERVICE_ERR;
2615 goto out;
2616 }
2617
2618
2619 #if defined(AIX)
2620 /* Decode the user name since AIX does not support logn user
2621 names by default. The name is encoded as _#uid. */
2622
2623 if (username[0] == '_') {
2624 uid_t id = atoi(&username[1]);
2625 struct passwd *pw = NULL;
2626
2627 if ((id!=0) && ((pw = getpwuid(id)) != NULL)) {
2628 real_username = strdup(pw->pw_name);
2629 }
2630 }
2631 #endif
2632
2633 if (!real_username) {
2634 /* Just making a copy of the username we got from PAM */
2635 if ((real_username = strdup(username)) == NULL) {
2636 _pam_log_debug(ctx, LOG_DEBUG,
2637 "memory allocation failure when copying "
2638 "username");
2639 retval = PAM_SERVICE_ERR;
2640 goto out;
2641 }
2642 }
2643
2644 /* Maybe this was a UPN */
2645
2646 if (strchr(real_username, '@') != NULL) {
2647 char *samaccountname = NULL;
2648
2649 samaccountname = winbind_upn_to_username(ctx,
2650 real_username);
2651 if (samaccountname) {
2652 free(real_username);
2653 real_username = strdup(samaccountname);
2654 }
2655 }
2656
2657 retval = _winbind_read_password(ctx, ctx->ctrl, NULL,
2658 _("Password: "), NULL,
2659 &password);
2660
2661 if (retval != PAM_SUCCESS) {
2662 _pam_log(ctx, LOG_ERR,
2663 "Could not retrieve user's password");
2664 retval = PAM_AUTHTOK_ERR;
2665 goto out;
2666 }
2667
2668 /* Let's not give too much away in the log file */
2669
2670 #ifdef DEBUG_PASSWORD
2671 _pam_log_debug(ctx, LOG_INFO,
2672 "Verify user '%s' with password '%s'",
2673 real_username, password);
2674 #else
2675 _pam_log_debug(ctx, LOG_INFO,
2676 "Verify user '%s'", real_username);
2677 #endif
2678
2679 member = get_member_from_config(ctx);
2680 cctype = get_krb5_cc_type_from_config(ctx);
2681 warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
2682
2683 /* Now use the username to look up password */
2684 retval = winbind_auth_request(ctx, real_username, password,
2685 member, cctype, warn_pwd_expire,
2686 NULL, NULL, NULL,
2687 NULL, &username_ret);
2688
2689 if (retval == PAM_NEW_AUTHTOK_REQD ||
2690 retval == PAM_AUTHTOK_EXPIRED) {
2691
2692 char *new_authtok_required_during_auth = NULL;
2693
2694 new_authtok_required = talloc_asprintf(NULL, "%d", retval);
2695 if (!new_authtok_required) {
2696 retval = PAM_BUF_ERR;
2697 goto out;
2698 }
2699
2700 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2701 new_authtok_required,
2702 _pam_winbind_cleanup_func);
2703
2704 retval = PAM_SUCCESS;
2705
2706 new_authtok_required_during_auth = talloc_asprintf(NULL, "%d", true);
2707 if (!new_authtok_required_during_auth) {
2708 retval = PAM_BUF_ERR;
2709 goto out;
2710 }
2711
2712 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2713 new_authtok_required_during_auth,
2714 _pam_winbind_cleanup_func);
2715
2716 goto out;
2717 }
2718
2719 out:
2720 if (username_ret) {
2721 pam_set_item (pamh, PAM_USER, username_ret);
2722 _pam_log_debug(ctx, LOG_INFO,
2723 "Returned user was '%s'", username_ret);
2724 free(username_ret);
2725 }
2726
2727 if (real_username) {
2728 free(real_username);
2729 }
2730
2731 if (!new_authtok_required) {
2732 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, NULL, NULL);
2733 }
2734
2735 if (retval != PAM_SUCCESS) {
2736 _pam_free_data_info3(pamh);
2737 }
2738
2739 if (ctx != NULL) {
2740 _PAM_LOG_FUNCTION_LEAVE("pam_sm_authenticate", ctx, retval);
2741 TALLOC_FREE(ctx);
2742 }
2743
2744 return retval;
2745 }
2746
2747 PAM_EXTERN
2748 int pam_sm_setcred(pam_handle_t *pamh, int flags,
2749 int argc, const char **argv)
2750 {
2751 int ret = PAM_SYSTEM_ERR;
2752 struct pwb_context *ctx = NULL;
2753
2754 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2755 if (ret) {
2756 goto out;
2757 }
2758
2759 _PAM_LOG_FUNCTION_ENTER("pam_sm_setcred", ctx);
2760
2761 switch (flags & ~PAM_SILENT) {
2762
2763 case PAM_DELETE_CRED:
2764 ret = _pam_delete_cred(pamh, flags, argc, argv);
2765 break;
2766 case PAM_REFRESH_CRED:
2767 _pam_log_debug(ctx, LOG_WARNING,
2768 "PAM_REFRESH_CRED not implemented");
2769 ret = PAM_SUCCESS;
2770 break;
2771 case PAM_REINITIALIZE_CRED:
2772 _pam_log_debug(ctx, LOG_WARNING,
2773 "PAM_REINITIALIZE_CRED not implemented");
2774 ret = PAM_SUCCESS;
2775 break;
2776 case PAM_ESTABLISH_CRED:
2777 _pam_log_debug(ctx, LOG_WARNING,
2778 "PAM_ESTABLISH_CRED not implemented");
2779 ret = PAM_SUCCESS;
2780 break;
2781 default:
2782 ret = PAM_SYSTEM_ERR;
2783 break;
2784 }
2785
2786 out:
2787
2788 _PAM_LOG_FUNCTION_LEAVE("pam_sm_setcred", ctx, ret);
2789
2790 TALLOC_FREE(ctx);
2791
2792 return ret;
2793 }
2794
2795 /*
2796 * Account management. We want to verify that the account exists
2797 * before returning PAM_SUCCESS
2798 */
2799 PAM_EXTERN
2800 int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
2801 int argc, const char **argv)
2802 {
2803 const char *username;
2804 int ret = PAM_USER_UNKNOWN;
2805 void *tmp = NULL;
2806 struct pwb_context *ctx = NULL;
2807
2808 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2809 if (ret) {
2810 goto out;
2811 }
2812
2813 _PAM_LOG_FUNCTION_ENTER("pam_sm_acct_mgmt", ctx);
2814
2815
2816 /* Get the username */
2817 ret = pam_get_user(pamh, &username, NULL);
2818 if ((ret != PAM_SUCCESS) || (!username)) {
2819 _pam_log_debug(ctx, LOG_DEBUG,
2820 "can not get the username");
2821 ret = PAM_SERVICE_ERR;
2822 goto out;
2823 }
2824
2825 /* Verify the username */
2826 ret = valid_user(ctx, username);
2827 switch (ret) {
2828 case -1:
2829 /* some sort of system error. The log was already printed */
2830 ret = PAM_SERVICE_ERR;
2831 goto out;
2832 case 1:
2833 /* the user does not exist */
2834 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
2835 username);
2836 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
2837 ret = PAM_IGNORE;
2838 goto out;
2839 }
2840 ret = PAM_USER_UNKNOWN;
2841 goto out;
2842 case 0:
2843 pam_get_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2844 (const void **)&tmp);
2845 if (tmp != NULL) {
2846 ret = atoi((const char *)tmp);
2847 switch (ret) {
2848 case PAM_AUTHTOK_EXPIRED:
2849 /* fall through, since new token is required in this case */
2850 case PAM_NEW_AUTHTOK_REQD:
2851 _pam_log(ctx, LOG_WARNING,
2852 "pam_sm_acct_mgmt success but %s is set",
2853 PAM_WINBIND_NEW_AUTHTOK_REQD);
2854 _pam_log(ctx, LOG_NOTICE,
2855 "user '%s' needs new password",
2856 username);
2857 /* PAM_AUTHTOKEN_REQD does not exist, but is documented in the manpage */
2858 ret = PAM_NEW_AUTHTOK_REQD;
2859 goto out;
2860 default:
2861 _pam_log(ctx, LOG_WARNING,
2862 "pam_sm_acct_mgmt success");
2863 _pam_log(ctx, LOG_NOTICE,
2864 "user '%s' granted access", username);
2865 ret = PAM_SUCCESS;
2866 goto out;
2867 }
2868 }
2869
2870 /* Otherwise, the authentication looked good */
2871 _pam_log(ctx, LOG_NOTICE,
2872 "user '%s' granted access", username);
2873 ret = PAM_SUCCESS;
2874 goto out;
2875 default:
2876 /* we don't know anything about this return value */
2877 _pam_log(ctx, LOG_ERR,
2878 "internal module error (ret = %d, user = '%s')",
2879 ret, username);
2880 ret = PAM_SERVICE_ERR;
2881 goto out;
2882 }
2883
2884 /* should not be reached */
2885 ret = PAM_IGNORE;
2886
2887 out:
2888
2889 _PAM_LOG_FUNCTION_LEAVE("pam_sm_acct_mgmt", ctx, ret);
2890
2891 TALLOC_FREE(ctx);
2892
2893 return ret;
2894 }
2895
2896 PAM_EXTERN
2897 int pam_sm_open_session(pam_handle_t *pamh, int flags,
2898 int argc, const char **argv)
2899 {
2900 int ret = PAM_SUCCESS;
2901 struct pwb_context *ctx = NULL;
2902
2903 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2904 if (ret) {
2905 goto out;
2906 }
2907
2908 _PAM_LOG_FUNCTION_ENTER("pam_sm_open_session", ctx);
2909
2910 if (ctx->ctrl & WINBIND_MKHOMEDIR) {
2911 /* check and create homedir */
2912 ret = _pam_mkhomedir(ctx);
2913 }
2914 out:
2915 _PAM_LOG_FUNCTION_LEAVE("pam_sm_open_session", ctx, ret);
2916
2917 TALLOC_FREE(ctx);
2918
2919 return ret;
2920 }
2921
2922 PAM_EXTERN
2923 int pam_sm_close_session(pam_handle_t *pamh, int flags,
2924 int argc, const char **argv)
2925 {
2926 int ret = PAM_SUCCESS;
2927 struct pwb_context *ctx = NULL;
2928
2929 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2930 if (ret) {
2931 goto out;
2932 }
2933
2934 _PAM_LOG_FUNCTION_ENTER("pam_sm_close_session", ctx);
2935
2936 out:
2937 _PAM_LOG_FUNCTION_LEAVE("pam_sm_close_session", ctx, ret);
2938
2939 TALLOC_FREE(ctx);
2940
2941 return ret;
2942 }
2943
2944 /**
2945 * evaluate whether we need to re-authenticate with kerberos after a
2946 * password change
2947 *
2948 * @param ctx PAM winbind context.
2949 * @param user The username
2950 *
2951 * @return boolean Returns true if required, false if not.
2952 */
2953
2954 static bool _pam_require_krb5_auth_after_chauthtok(struct pwb_context *ctx,
2955 const char *user)
2956 {
2957
2958 /* Make sure that we only do this if a) the chauthtok got initiated
2959 * during a logon attempt (authenticate->acct_mgmt->chauthtok) b) any
2960 * later password change via the "passwd" command if done by the user
2961 * itself
2962 * NB. If we login from gdm or xdm and the password expires,
2963 * we change the password, but there is no memory cache.
2964 * Thus, even for passthrough login, we should do the
2965 * authentication again to update memory cache.
2966 * --- BoYang
2967 * */
2968
2969 char *new_authtok_reqd_during_auth = NULL;
2970 struct passwd *pwd = NULL;
2971
2972 _pam_get_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2973 &new_authtok_reqd_during_auth);
2974 pam_set_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2975 NULL, NULL);
2976
2977 if (new_authtok_reqd_during_auth) {
2978 return true;
2979 }
2980
2981 pwd = getpwnam(user);
2982 if (!pwd) {
2983 return false;
2984 }
2985
2986 if (getuid() == pwd->pw_uid) {
2987 return true;
2988 }
2989
2990 return false;
2991 }
2992
2993
2994 PAM_EXTERN
2995 int pam_sm_chauthtok(pam_handle_t * pamh, int flags,
2996 int argc, const char **argv)
2997 {
2998 unsigned int lctrl;
2999 int ret;
3000 bool cached_login = false;
3001
3002 /* <DO NOT free() THESE> */
3003 const char *user;
3004 char *pass_old, *pass_new;
3005 /* </DO NOT free() THESE> */
3006
3007 char *Announce;
3008
3009 int retry = 0;
3010 char *username_ret = NULL;
3011 struct wbcAuthErrorInfo *error = NULL;
3012 struct pwb_context *ctx = NULL;
3013
3014 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
3015 if (ret) {
3016 goto out;
3017 }
3018
3019 _PAM_LOG_FUNCTION_ENTER("pam_sm_chauthtok", ctx);
3020
3021 cached_login = (ctx->ctrl & WINBIND_CACHED_LOGIN);
3022
3023 /* clearing offline bit for auth */
3024 ctx->ctrl &= ~WINBIND_CACHED_LOGIN;
3025
3026 /*
3027 * First get the name of a user
3028 */
3029 ret = pam_get_user(pamh, &user, _("Username: "));
3030 if (ret) {
3031 _pam_log(ctx, LOG_ERR,
3032 "password - could not identify user");
3033 goto out;
3034 }
3035
3036 if (user == NULL) {
3037 _pam_log(ctx, LOG_ERR, "username was NULL!");
3038 ret = PAM_USER_UNKNOWN;
3039 goto out;
3040 }
3041
3042 _pam_log_debug(ctx, LOG_DEBUG, "username [%s] obtained", user);
3043
3044 /* check if this is really a user in winbindd, not only in NSS */
3045 ret = valid_user(ctx, user);
3046 switch (ret) {
3047 case 1:
3048 ret = PAM_USER_UNKNOWN;
3049 goto out;
3050 case -1:
3051 ret = PAM_SYSTEM_ERR;
3052 goto out;
3053 default:
3054 break;
3055 }
3056
3057 /*
3058 * obtain and verify the current password (OLDAUTHTOK) for
3059 * the user.
3060 */
3061
3062 if (flags & PAM_PRELIM_CHECK) {
3063 time_t pwdlastset_prelim = 0;
3064
3065 /* instruct user what is happening */
3066
3067 #define greeting _("Changing password for")
3068 Announce = talloc_asprintf(ctx, "%s %s", greeting, user);
3069 if (!Announce) {
3070 _pam_log(ctx, LOG_CRIT,
3071 "password - out of memory");
3072 ret = PAM_BUF_ERR;
3073 goto out;
3074 }
3075 #undef greeting
3076
3077 lctrl = ctx->ctrl | WINBIND__OLD_PASSWORD;
3078 ret = _winbind_read_password(ctx, lctrl,
3079 Announce,
3080 _("(current) NT password: "),
3081 NULL,
3082 (const char **) &pass_old);
3083 TALLOC_FREE(Announce);
3084 if (ret != PAM_SUCCESS) {
3085 _pam_log(ctx, LOG_NOTICE,
3086 "password - (old) token not obtained");
3087 goto out;
3088 }
3089
3090 /* verify that this is the password for this user */
3091
3092 ret = winbind_auth_request(ctx, user, pass_old,
3093 NULL, NULL, 0,
3094 &error, NULL, NULL,
3095 &pwdlastset_prelim, NULL);
3096
3097 if (ret != PAM_ACCT_EXPIRED &&
3098 ret != PAM_AUTHTOK_EXPIRED &&
3099 ret != PAM_NEW_AUTHTOK_REQD &&
3100 ret != PAM_SUCCESS) {
3101 pass_old = NULL;
3102 goto out;
3103 }
3104
3105 pam_set_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3106 (void *)pwdlastset_prelim, NULL);
3107
3108 ret = pam_set_item(pamh, PAM_OLDAUTHTOK,
3109 (const void *) pass_old);
3110 pass_old = NULL;
3111 if (ret != PAM_SUCCESS) {
3112 _pam_log(ctx, LOG_CRIT,
3113 "failed to set PAM_OLDAUTHTOK");
3114 }
3115 } else if (flags & PAM_UPDATE_AUTHTOK) {
3116
3117 time_t pwdlastset_update = 0;
3118
3119 /*
3120 * obtain the proposed password
3121 */
3122
3123 /*
3124 * get the old token back.
3125 */
3126
3127 ret = _pam_get_item(pamh, PAM_OLDAUTHTOK, &pass_old);
3128
3129 if (ret != PAM_SUCCESS) {
3130 _pam_log(ctx, LOG_NOTICE,
3131 "user not authenticated");
3132 goto out;
3133 }
3134
3135 lctrl = ctx->ctrl & ~WINBIND_TRY_FIRST_PASS_ARG;
3136
3137 if (on(WINBIND_USE_AUTHTOK_ARG, lctrl)) {
3138 lctrl |= WINBIND_USE_FIRST_PASS_ARG;
3139 }
3140 retry = 0;
3141 ret = PAM_AUTHTOK_ERR;
3142 while ((ret != PAM_SUCCESS) && (retry++ < MAX_PASSWD_TRIES)) {
3143 /*
3144 * use_authtok is to force the use of a previously entered
3145 * password -- needed for pluggable password strength checking
3146 */
3147
3148 ret = _winbind_read_password(ctx, lctrl,
3149 NULL,
3150 _("Enter new NT password: "),
3151 _("Retype new NT password: "),
3152 (const char **)&pass_new);
3153
3154 if (ret != PAM_SUCCESS) {
3155 _pam_log_debug(ctx, LOG_ALERT,
3156 "password - "
3157 "new password not obtained");
3158 pass_old = NULL;/* tidy up */
3159 goto out;
3160 }
3161
3162 /*
3163 * At this point we know who the user is and what they
3164 * propose as their new password. Verify that the new
3165 * password is acceptable.
3166 */
3167
3168 if (pass_new[0] == '\0') {/* "\0" password = NULL */
3169 pass_new = NULL;
3170 }
3171 }
3172
3173 /*
3174 * By reaching here we have approved the passwords and must now
3175 * rebuild the password database file.
3176 */
3177 _pam_get_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3178 &pwdlastset_update);
3179
3180 /*
3181 * if cached creds were enabled, make sure to set the
3182 * WINBIND_CACHED_LOGIN bit here in order to have winbindd
3183 * update the cached creds storage - gd
3184 */
3185 if (cached_login) {
3186 ctx->ctrl |= WINBIND_CACHED_LOGIN;
3187 }
3188
3189 ret = winbind_chauthtok_request(ctx, user, pass_old,
3190 pass_new, pwdlastset_update);
3191 if (ret) {
3192 pass_old = pass_new = NULL;
3193 goto out;
3194 }
3195
3196 if (_pam_require_krb5_auth_after_chauthtok(ctx, user)) {
3197
3198 const char *member = NULL;
3199 const char *cctype = NULL;
3200 int warn_pwd_expire;
3201 struct wbcLogonUserInfo *info = NULL;
3202 struct wbcUserPasswordPolicyInfo *policy = NULL;
3203
3204 member = get_member_from_config(ctx);
3205 cctype = get_krb5_cc_type_from_config(ctx);
3206 warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
3207
3208 /* Keep WINBIND_CACHED_LOGIN bit for
3209 * authentication after changing the password.
3210 * This will update the cached credentials in case
3211 * that winbindd_dual_pam_chauthtok() fails
3212 * to update them.
3213 * --- BoYang
3214 * */
3215
3216 ret = winbind_auth_request(ctx, user, pass_new,
3217 member, cctype, 0,
3218 &error, &info, &policy,
3219 NULL, &username_ret);
3220 pass_old = pass_new = NULL;
3221
3222 if (ret == PAM_SUCCESS) {
3223
3224 struct wbcAuthUserInfo *user_info = NULL;
3225
3226 if (info && info->info) {
3227 user_info = info->info;
3228 }
3229
3230 /* warn a user if the password is about to
3231 * expire soon */
3232 _pam_warn_password_expiry(ctx, user_info, policy,
3233 warn_pwd_expire,
3234 NULL, NULL);
3235
3236 /* set some info3 info for other modules in the
3237 * stack */
3238 _pam_set_data_info3(ctx, user_info);
3239
3240 /* put krb5ccname into env */
3241 _pam_setup_krb5_env(ctx, info);
3242
3243 if (username_ret) {
3244 pam_set_item(pamh, PAM_USER,
3245 username_ret);
3246 _pam_log_debug(ctx, LOG_INFO,
3247 "Returned user was '%s'",
3248 username_ret);
3249 free(username_ret);
3250 }
3251
3252 }
3253
3254 if (info && info->blobs) {
3255 wbcFreeMemory(info->blobs);
3256 }
3257 wbcFreeMemory(info);
3258 wbcFreeMemory(policy);
3259
3260 goto out;
3261 }
3262 } else {
3263 ret = PAM_SERVICE_ERR;
3264 }
3265
3266 out:
3267 {
3268 /* Deal with offline errors. */
3269 int i;
3270 const char *codes[] = {
3271 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
3272 "NT_STATUS_NO_LOGON_SERVERS",
3273 "NT_STATUS_ACCESS_DENIED"
3274 };
3275
3276 for (i=0; i<ARRAY_SIZE(codes); i++) {
3277 int _ret;
3278 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
3279 break;
3280 }
3281 }
3282 }
3283
3284 wbcFreeMemory(error);
3285
3286 _PAM_LOG_FUNCTION_LEAVE("pam_sm_chauthtok", ctx, ret);
3287
3288 TALLOC_FREE(ctx);
3289
3290 return ret;
3291 }
3292
3293 #ifdef PAM_STATIC
3294
3295 /* static module data */
3296
3297 struct pam_module _pam_winbind_modstruct = {
3298 MODULE_NAME,
3299 pam_sm_authenticate,
3300 pam_sm_setcred,
3301 pam_sm_acct_mgmt,
3302 pam_sm_open_session,
3303 pam_sm_close_session,
3304 pam_sm_chauthtok
3305 };
3306
3307 #endif
3308
3309 /*
3310 * Copyright (c) Andrew Tridgell <tridge@samba.org> 2000
3311 * Copyright (c) Tim Potter <tpot@samba.org> 2000
3312 * Copyright (c) Andrew Bartlettt <abartlet@samba.org> 2002
3313 * Copyright (c) Guenther Deschner <gd@samba.org> 2005-2008
3314 * Copyright (c) Jan Rêkorajski 1999.
3315 * Copyright (c) Andrew G. Morgan 1996-8.
3316 * Copyright (c) Alex O. Yuriev, 1996.
3317 * Copyright (c) Cristian Gafton 1996.
3318 * Copyright (C) Elliot Lee <sopwith@redhat.com> 1996, Red Hat Software.
3319 *
3320 * Redistribution and use in source and binary forms, with or without
3321 * modification, are permitted provided that the following conditions
3322 * are met:
3323 * 1. Redistributions of source code must retain the above copyright
3324 * notice, and the entire permission notice in its entirety,
3325 * including the disclaimer of warranties.
3326 * 2. Redistributions in binary form must reproduce the above copyright
3327 * notice, this list of conditions and the following disclaimer in the
3328 * documentation and/or other materials provided with the distribution.
3329 * 3. The name of the author may not be used to endorse or promote
3330 * products derived from this software without specific prior
3331 * written permission.
3332 *
3333 * ALTERNATIVELY, this product may be distributed under the terms of
3334 * the GNU Public License, in which case the provisions of the GPL are
3335 * required INSTEAD OF the above restrictions. (This clause is
3336 * necessary due to a potential bad interaction between the GPL and
3337 * the restrictions contained in a BSD-style copyright.)
3338 *
3339 * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
3340 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
3341 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
3342 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
3343 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
3344 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
3345 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
3346 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
3347 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
3348 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
3349 * OF THE POSSIBILITY OF SUCH DAMAGE.
3350 */
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