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nsswitch: Remove unused variable in _pam_winbind_change_pwd().
[Samba/bb.git] / nsswitch / pam_winbind.c
blobd4df8b169a33a73c2985ca02dbe7ac3f5aaed3a1
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 int ret;
816 bool retval = false;
817 pmsg = &msg;
818 msg.msg_style = PAM_RADIO_TYPE;
819 msg.msg = _("Do you want to change your password now?");
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 ((resp->resp != NULL) && (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 = NULL;
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 (asprintf(&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 free(var);
1253 }
1254
1255 /**
1256 * Copy unix username if available (further processed in PAM).
1257 *
1258 * @param ctx PAM winbind context
1259 * @param user_ret A pointer that holds a pointer to a string
1260 * @param unix_username A username
1261 *
1262 * @return void.
1263 */
1264
1265 static void _pam_setup_unix_username(struct pwb_context *ctx,
1266 char **user_ret,
1267 struct wbcLogonUserInfo *info)
1268 {
1269 const char *unix_username = NULL;
1270 uint32_t i;
1271
1272 if (!user_ret || !info) {
1273 return;
1274 }
1275
1276 for (i=0; i < info->num_blobs; i++) {
1277 if (strcasecmp(info->blobs[i].name, "unix_username") == 0) {
1278 unix_username = (const char *)info->blobs[i].blob.data;
1279 break;
1280 }
1281 }
1282
1283 if (!unix_username || !unix_username[0]) {
1284 return;
1285 }
1286
1287 *user_ret = strdup(unix_username);
1288 }
1289
1290 /**
1291 * Set string into the PAM stack.
1292 *
1293 * @param ctx PAM winbind context.
1294 * @param data_name Key name for pam_set_data.
1295 * @param value String value.
1296 *
1297 * @return void.
1298 */
1299
1300 static void _pam_set_data_string(struct pwb_context *ctx,
1301 const char *data_name,
1302 const char *value)
1303 {
1304 int ret;
1305
1306 if (!data_name || !value || (strlen(data_name) == 0) ||
1307 (strlen(value) == 0)) {
1308 return;
1309 }
1310
1311 ret = pam_set_data(ctx->pamh, data_name, talloc_strdup(NULL, value),
1312 _pam_winbind_cleanup_func);
1313 if (ret) {
1314 _pam_log_debug(ctx, LOG_DEBUG,
1315 "Could not set data %s: %s\n",
1316 data_name, pam_strerror(ctx->pamh, ret));
1317 }
1318 }
1319
1320 /**
1321 * Set info3 strings into the PAM stack.
1322 *
1323 * @param ctx PAM winbind context.
1324 * @param data_name Key name for pam_set_data.
1325 * @param value String value.
1326 *
1327 * @return void.
1328 */
1329
1330 static void _pam_set_data_info3(struct pwb_context *ctx,
1331 const struct wbcAuthUserInfo *info)
1332 {
1333 _pam_set_data_string(ctx, PAM_WINBIND_HOMEDIR,
1334 info->home_directory);
1335 _pam_set_data_string(ctx, PAM_WINBIND_LOGONSCRIPT,
1336 info->logon_script);
1337 _pam_set_data_string(ctx, PAM_WINBIND_LOGONSERVER,
1338 info->logon_server);
1339 _pam_set_data_string(ctx, PAM_WINBIND_PROFILEPATH,
1340 info->profile_path);
1341 }
1342
1343 /**
1344 * Free info3 strings in the PAM stack.
1345 *
1346 * @param pamh PAM handle
1347 *
1348 * @return void.
1349 */
1350
1351 static void _pam_free_data_info3(pam_handle_t *pamh)
1352 {
1353 pam_set_data(pamh, PAM_WINBIND_HOMEDIR, NULL, NULL);
1354 pam_set_data(pamh, PAM_WINBIND_LOGONSCRIPT, NULL, NULL);
1355 pam_set_data(pamh, PAM_WINBIND_LOGONSERVER, NULL, NULL);
1356 pam_set_data(pamh, PAM_WINBIND_PROFILEPATH, NULL, NULL);
1357 }
1358
1359 /**
1360 * Send PAM_ERROR_MSG for cached or grace logons.
1361 *
1362 * @param ctx PAM winbind context.
1363 * @param username User in PAM request.
1364 * @param info3_user_flgs Info3 flags containing logon type bits.
1365 *
1366 * @return void.
1367 */
1368
1369 static void _pam_warn_logon_type(struct pwb_context *ctx,
1370 const char *username,
1371 uint32_t info3_user_flgs)
1372 {
1373 /* inform about logon type */
1374 if (PAM_WB_GRACE_LOGON(info3_user_flgs)) {
1375
1376 _make_remark(ctx, PAM_ERROR_MSG,
1377 _("Grace login. "
1378 "Please change your password as soon you're "
1379 "online again"));
1380 _pam_log_debug(ctx, LOG_DEBUG,
1381 "User %s logged on using grace logon\n",
1382 username);
1383
1384 } else if (PAM_WB_CACHED_LOGON(info3_user_flgs)) {
1385
1386 _make_remark(ctx, PAM_ERROR_MSG,
1387 _("Domain Controller unreachable, "
1388 "using cached credentials instead. "
1389 "Network resources may be unavailable"));
1390 _pam_log_debug(ctx, LOG_DEBUG,
1391 "User %s logged on using cached credentials\n",
1392 username);
1393 }
1394 }
1395
1396 /**
1397 * Send PAM_ERROR_MSG for krb5 errors.
1398 *
1399 * @param ctx PAM winbind context.
1400 * @param username User in PAM request.
1401 * @param info3_user_flgs Info3 flags containing logon type bits.
1402 *
1403 * @return void.
1404 */
1405
1406 static void _pam_warn_krb5_failure(struct pwb_context *ctx,
1407 const char *username,
1408 uint32_t info3_user_flgs)
1409 {
1410 if (PAM_WB_KRB5_CLOCK_SKEW(info3_user_flgs)) {
1411 _make_remark(ctx, PAM_ERROR_MSG,
1412 _("Failed to establish your Kerberos Ticket cache "
1413 "due time differences\n"
1414 "with the domain controller. "
1415 "Please verify the system time.\n"));
1416 _pam_log_debug(ctx, LOG_DEBUG,
1417 "User %s: Clock skew when getting Krb5 TGT\n",
1418 username);
1419 }
1420 }
1421
1422 static bool _pam_check_remark_auth_err(struct pwb_context *ctx,
1423 const struct wbcAuthErrorInfo *e,
1424 const char *nt_status_string,
1425 int *pam_err)
1426 {
1427 const char *ntstatus = NULL;
1428 const char *error_string = NULL;
1429
1430 if (!e || !pam_err) {
1431 return false;
1432 }
1433
1434 ntstatus = e->nt_string;
1435 if (!ntstatus) {
1436 return false;
1437 }
1438
1439 if (strcasecmp(ntstatus, nt_status_string) == 0) {
1440
1441 error_string = _get_ntstatus_error_string(nt_status_string);
1442 if (error_string) {
1443 _make_remark(ctx, PAM_ERROR_MSG, error_string);
1444 *pam_err = e->pam_error;
1445 return true;
1446 }
1447
1448 if (e->display_string) {
1449 _make_remark(ctx, PAM_ERROR_MSG, _(e->display_string));
1450 *pam_err = e->pam_error;
1451 return true;
1452 }
1453
1454 _make_remark(ctx, PAM_ERROR_MSG, nt_status_string);
1455 *pam_err = e->pam_error;
1456
1457 return true;
1458 }
1459
1460 return false;
1461 };
1462
1463 /**
1464 * Compose Password Restriction String for a PAM_ERROR_MSG conversation.
1465 *
1466 * @param i The wbcUserPasswordPolicyInfo struct.
1467 *
1468 * @return string (caller needs to talloc_free).
1469 */
1470
1471 static char *_pam_compose_pwd_restriction_string(struct pwb_context *ctx,
1472 struct wbcUserPasswordPolicyInfo *i)
1473 {
1474 char *str = NULL;
1475
1476 if (!i) {
1477 goto failed;
1478 }
1479
1480 str = talloc_asprintf(ctx, _("Your password "));
1481 if (!str) {
1482 goto failed;
1483 }
1484
1485 if (i->min_length_password > 0) {
1486 str = talloc_asprintf_append(str,
1487 _("must be at least %d characters; "),
1488 i->min_length_password);
1489 if (!str) {
1490 goto failed;
1491 }
1492 }
1493
1494 if (i->password_history > 0) {
1495 str = talloc_asprintf_append(str,
1496 _("cannot repeat any of your previous %d "
1497 "passwords; "),
1498 i->password_history);
1499 if (!str) {
1500 goto failed;
1501 }
1502 }
1503
1504 if (i->password_properties & WBC_DOMAIN_PASSWORD_COMPLEX) {
1505 str = talloc_asprintf_append(str,
1506 _("must contain capitals, numerals "
1507 "or punctuation; "
1508 "and cannot contain your account "
1509 "or full name; "));
1510 if (!str) {
1511 goto failed;
1512 }
1513 }
1514
1515 str = talloc_asprintf_append(str,
1516 _("Please type a different password. "
1517 "Type a password which meets these requirements in "
1518 "both text boxes."));
1519 if (!str) {
1520 goto failed;
1521 }
1522
1523 return str;
1524
1525 failed:
1526 TALLOC_FREE(str);
1527 return NULL;
1528 }
1529
1530 static int _pam_create_homedir(struct pwb_context *ctx,
1531 const char *dirname,
1532 mode_t mode)
1533 {
1534 struct stat sbuf;
1535
1536 if (stat(dirname, &sbuf) == 0) {
1537 return PAM_SUCCESS;
1538 }
1539
1540 if (mkdir(dirname, mode) != 0) {
1541
1542 _make_remark_format(ctx, PAM_TEXT_INFO,
1543 _("Creating directory: %s failed: %s"),
1544 dirname, strerror(errno));
1545 _pam_log(ctx, LOG_ERR, "could not create dir: %s (%s)",
1546 dirname, strerror(errno));
1547 return PAM_PERM_DENIED;
1548 }
1549
1550 return PAM_SUCCESS;
1551 }
1552
1553 static int _pam_chown_homedir(struct pwb_context *ctx,
1554 const char *dirname,
1555 uid_t uid,
1556 gid_t gid)
1557 {
1558 if (chown(dirname, uid, gid) != 0) {
1559 _pam_log(ctx, LOG_ERR, "failed to chown user homedir: %s (%s)",
1560 dirname, strerror(errno));
1561 return PAM_PERM_DENIED;
1562 }
1563
1564 return PAM_SUCCESS;
1565 }
1566
1567 static int _pam_mkhomedir(struct pwb_context *ctx)
1568 {
1569 struct passwd *pwd = NULL;
1570 char *token = NULL;
1571 char *create_dir = NULL;
1572 char *user_dir = NULL;
1573 int ret;
1574 const char *username;
1575 mode_t mode = 0700;
1576 char *safe_ptr = NULL;
1577 char *p = NULL;
1578
1579 /* Get the username */
1580 ret = pam_get_user(ctx->pamh, &username, NULL);
1581 if ((ret != PAM_SUCCESS) || (!username)) {
1582 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1583 return PAM_SERVICE_ERR;
1584 }
1585
1586 pwd = getpwnam(username);
1587 if (pwd == NULL) {
1588 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1589 return PAM_USER_UNKNOWN;
1590 }
1591 _pam_log_debug(ctx, LOG_DEBUG, "homedir is: %s", pwd->pw_dir);
1592
1593 ret = _pam_create_homedir(ctx, pwd->pw_dir, 0700);
1594 if (ret == PAM_SUCCESS) {
1595 ret = _pam_chown_homedir(ctx, pwd->pw_dir,
1596 pwd->pw_uid,
1597 pwd->pw_gid);
1598 }
1599
1600 if (ret == PAM_SUCCESS) {
1601 return ret;
1602 }
1603
1604 /* maybe we need to create parent dirs */
1605 create_dir = talloc_strdup(ctx, "/");
1606 if (!create_dir) {
1607 return PAM_BUF_ERR;
1608 }
1609
1610 /* find final directory */
1611 user_dir = strrchr(pwd->pw_dir, '/');
1612 if (!user_dir) {
1613 return PAM_BUF_ERR;
1614 }
1615 user_dir++;
1616
1617 _pam_log(ctx, LOG_DEBUG, "final directory: %s", user_dir);
1618
1619 p = pwd->pw_dir;
1620
1621 while ((token = strtok_r(p, "/", &safe_ptr)) != NULL) {
1622
1623 mode = 0755;
1624
1625 p = NULL;
1626
1627 _pam_log_debug(ctx, LOG_DEBUG, "token is %s", token);
1628
1629 create_dir = talloc_asprintf_append(create_dir, "%s/", token);
1630 if (!create_dir) {
1631 return PAM_BUF_ERR;
1632 }
1633 _pam_log_debug(ctx, LOG_DEBUG, "current_dir is %s", create_dir);
1634
1635 if (strcmp(token, user_dir) == 0) {
1636 _pam_log_debug(ctx, LOG_DEBUG, "assuming last directory: %s", token);
1637 mode = 0700;
1638 }
1639
1640 ret = _pam_create_homedir(ctx, create_dir, mode);
1641 if (ret) {
1642 return ret;
1643 }
1644 }
1645
1646 return _pam_chown_homedir(ctx, create_dir,
1647 pwd->pw_uid,
1648 pwd->pw_gid);
1649 }
1650
1651 /* talk to winbindd */
1652 static int winbind_auth_request(struct pwb_context *ctx,
1653 const char *user,
1654 const char *pass,
1655 const char *member,
1656 const char *cctype,
1657 const int warn_pwd_expire,
1658 struct wbcAuthErrorInfo **p_error,
1659 struct wbcLogonUserInfo **p_info,
1660 struct wbcUserPasswordPolicyInfo **p_policy,
1661 time_t *pwd_last_set,
1662 char **user_ret)
1663 {
1664 wbcErr wbc_status;
1665
1666 struct wbcLogonUserParams logon;
1667 char membership_of[1024];
1668 uid_t user_uid = -1;
1669 uint32_t flags = WBFLAG_PAM_INFO3_TEXT |
1670 WBFLAG_PAM_GET_PWD_POLICY;
1671
1672 struct wbcLogonUserInfo *info = NULL;
1673 struct wbcAuthUserInfo *user_info = NULL;
1674 struct wbcAuthErrorInfo *error = NULL;
1675 struct wbcUserPasswordPolicyInfo *policy = NULL;
1676
1677 int ret = PAM_AUTH_ERR;
1678 int i;
1679 const char *codes[] = {
1680 "NT_STATUS_PASSWORD_EXPIRED",
1681 "NT_STATUS_PASSWORD_MUST_CHANGE",
1682 "NT_STATUS_INVALID_WORKSTATION",
1683 "NT_STATUS_INVALID_LOGON_HOURS",
1684 "NT_STATUS_ACCOUNT_EXPIRED",
1685 "NT_STATUS_ACCOUNT_DISABLED",
1686 "NT_STATUS_ACCOUNT_LOCKED_OUT",
1687 "NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
1688 "NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
1689 "NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
1690 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1691 "NT_STATUS_NO_LOGON_SERVERS",
1692 "NT_STATUS_WRONG_PASSWORD",
1693 "NT_STATUS_ACCESS_DENIED"
1694 };
1695
1696 if (pwd_last_set) {
1697 *pwd_last_set = 0;
1698 }
1699
1700 /* Krb5 auth always has to go against the KDC of the user's realm */
1701
1702 if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1703 flags |= WBFLAG_PAM_CONTACT_TRUSTDOM;
1704 }
1705
1706 if (ctx->ctrl & (WINBIND_KRB5_AUTH|WINBIND_CACHED_LOGIN)) {
1707 struct passwd *pwd = NULL;
1708
1709 pwd = getpwnam(user);
1710 if (pwd == NULL) {
1711 return PAM_USER_UNKNOWN;
1712 }
1713 user_uid = pwd->pw_uid;
1714 }
1715
1716 if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1717
1718 _pam_log_debug(ctx, LOG_DEBUG,
1719 "enabling krb5 login flag\n");
1720
1721 flags |= WBFLAG_PAM_KRB5 |
1722 WBFLAG_PAM_FALLBACK_AFTER_KRB5;
1723 }
1724
1725 if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1726 _pam_log_debug(ctx, LOG_DEBUG,
1727 "enabling cached login flag\n");
1728 flags |= WBFLAG_PAM_CACHED_LOGIN;
1729 }
1730
1731 if (user_ret) {
1732 *user_ret = NULL;
1733 flags |= WBFLAG_PAM_UNIX_NAME;
1734 }
1735
1736 if (cctype != NULL) {
1737 _pam_log_debug(ctx, LOG_DEBUG,
1738 "enabling request for a %s krb5 ccache\n",
1739 cctype);
1740 }
1741
1742 if (member != NULL) {
1743
1744 ZERO_STRUCT(membership_of);
1745
1746 if (!winbind_name_list_to_sid_string_list(ctx, user, member,
1747 membership_of,
1748 sizeof(membership_of))) {
1749 _pam_log_debug(ctx, LOG_ERR,
1750 "failed to serialize membership of sid "
1751 "\"%s\"\n", member);
1752 return PAM_AUTH_ERR;
1753 }
1754 }
1755
1756 ZERO_STRUCT(logon);
1757
1758 logon.username = user;
1759 logon.password = pass;
1760
1761 if (cctype) {
1762 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1763 &logon.blobs,
1764 "krb5_cc_type",
1765 0,
1766 discard_const_p(uint8_t, cctype),
1767 strlen(cctype)+1);
1768 if (!WBC_ERROR_IS_OK(wbc_status)) {
1769 goto done;
1770 }
1771 }
1772
1773 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1774 &logon.blobs,
1775 "flags",
1776 0,
1777 (uint8_t *)&flags,
1778 sizeof(flags));
1779 if (!WBC_ERROR_IS_OK(wbc_status)) {
1780 goto done;
1781 }
1782
1783 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1784 &logon.blobs,
1785 "user_uid",
1786 0,
1787 (uint8_t *)&user_uid,
1788 sizeof(user_uid));
1789 if (!WBC_ERROR_IS_OK(wbc_status)) {
1790 goto done;
1791 }
1792
1793 if (member) {
1794 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1795 &logon.blobs,
1796 "membership_of",
1797 0,
1798 (uint8_t *)membership_of,
1799 sizeof(membership_of));
1800 if (!WBC_ERROR_IS_OK(wbc_status)) {
1801 goto done;
1802 }
1803 }
1804
1805 wbc_status = wbcLogonUser(&logon, &info, &error, &policy);
1806 ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1807 user, "wbcLogonUser");
1808 wbcFreeMemory(logon.blobs);
1809 logon.blobs = NULL;
1810
1811 if (info && info->info) {
1812 user_info = info->info;
1813 }
1814
1815 if (pwd_last_set && user_info) {
1816 *pwd_last_set = user_info->pass_last_set_time;
1817 }
1818
1819 if (p_info && info) {
1820 *p_info = info;
1821 }
1822
1823 if (p_policy && policy) {
1824 *p_policy = policy;
1825 }
1826
1827 if (p_error && error) {
1828 /* We want to process the error in the caller. */
1829 *p_error = error;
1830 return ret;
1831 }
1832
1833 for (i=0; i<ARRAY_SIZE(codes); i++) {
1834 int _ret = ret;
1835 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1836 ret = _ret;
1837 goto done;
1838 }
1839 }
1840
1841 if ((ret == PAM_SUCCESS) && user_info && policy && info) {
1842
1843 bool already_expired = false;
1844 bool change_pwd = false;
1845
1846 /* warn a user if the password is about to expire soon */
1847 _pam_warn_password_expiry(ctx, user_info, policy,
1848 warn_pwd_expire,
1849 &already_expired,
1850 &change_pwd);
1851
1852 if (already_expired == true) {
1853
1854 SMB_TIME_T last_set = user_info->pass_last_set_time;
1855
1856 _pam_log_debug(ctx, LOG_DEBUG,
1857 "Password has expired "
1858 "(Password was last set: %lld, "
1859 "the policy says it should expire here "
1860 "%lld (now it's: %ld))\n",
1861 (long long int)last_set,
1862 (long long int)last_set +
1863 policy->expire,
1864 (long)time(NULL));
1865
1866 return PAM_AUTHTOK_EXPIRED;
1867 }
1868
1869 if (change_pwd) {
1870 ret = PAM_NEW_AUTHTOK_REQD;
1871 goto done;
1872 }
1873
1874 /* inform about logon type */
1875 _pam_warn_logon_type(ctx, user, user_info->user_flags);
1876
1877 /* inform about krb5 failures */
1878 _pam_warn_krb5_failure(ctx, user, user_info->user_flags);
1879
1880 /* set some info3 info for other modules in the stack */
1881 _pam_set_data_info3(ctx, user_info);
1882
1883 /* put krb5ccname into env */
1884 _pam_setup_krb5_env(ctx, info);
1885
1886 /* If winbindd returned a username, return the pointer to it
1887 * here. */
1888 _pam_setup_unix_username(ctx, user_ret, info);
1889 }
1890
1891 done:
1892 wbcFreeMemory(logon.blobs);
1893 if (info && info->blobs && !p_info) {
1894 wbcFreeMemory(info->blobs);
1895 }
1896 if (error && !p_error) {
1897 wbcFreeMemory(error);
1898 }
1899 if (info && !p_info) {
1900 wbcFreeMemory(info);
1901 }
1902 if (policy && !p_policy) {
1903 wbcFreeMemory(policy);
1904 }
1905
1906 return ret;
1907 }
1908
1909 /* talk to winbindd */
1910 static int winbind_chauthtok_request(struct pwb_context *ctx,
1911 const char *user,
1912 const char *oldpass,
1913 const char *newpass,
1914 time_t pwd_last_set)
1915 {
1916 wbcErr wbc_status;
1917 struct wbcChangePasswordParams params;
1918 struct wbcAuthErrorInfo *error = NULL;
1919 struct wbcUserPasswordPolicyInfo *policy = NULL;
1920 enum wbcPasswordChangeRejectReason reject_reason = -1;
1921 uint32_t flags = 0;
1922
1923 int i;
1924 const char *codes[] = {
1925 "NT_STATUS_BACKUP_CONTROLLER",
1926 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1927 "NT_STATUS_NO_LOGON_SERVERS",
1928 "NT_STATUS_ACCESS_DENIED",
1929 "NT_STATUS_PWD_TOO_SHORT", /* TODO: tell the min pwd length ? */
1930 "NT_STATUS_PWD_TOO_RECENT", /* TODO: tell the minage ? */
1931 "NT_STATUS_PWD_HISTORY_CONFLICT" /* TODO: tell the history length ? */
1932 };
1933 int ret = PAM_AUTH_ERR;
1934
1935 ZERO_STRUCT(params);
1936
1937 if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1938 flags |= WBFLAG_PAM_KRB5 |
1939 WBFLAG_PAM_CONTACT_TRUSTDOM;
1940 }
1941
1942 if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1943 flags |= WBFLAG_PAM_CACHED_LOGIN;
1944 }
1945
1946 params.account_name = user;
1947 params.level = WBC_CHANGE_PASSWORD_LEVEL_PLAIN;
1948 params.old_password.plaintext = oldpass;
1949 params.new_password.plaintext = newpass;
1950 params.flags = flags;
1951
1952 wbc_status = wbcChangeUserPasswordEx(&params, &error, &reject_reason, &policy);
1953 ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1954 user, "wbcChangeUserPasswordEx");
1955
1956 if (WBC_ERROR_IS_OK(wbc_status)) {
1957 _pam_log(ctx, LOG_NOTICE,
1958 "user '%s' password changed", user);
1959 return PAM_SUCCESS;
1960 }
1961
1962 if (!error) {
1963 wbcFreeMemory(policy);
1964 return ret;
1965 }
1966
1967 for (i=0; i<ARRAY_SIZE(codes); i++) {
1968 int _ret = ret;
1969 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1970 ret = _ret;
1971 goto done;
1972 }
1973 }
1974
1975 if (!strcasecmp(error->nt_string,
1976 "NT_STATUS_PASSWORD_RESTRICTION")) {
1977
1978 char *pwd_restriction_string = NULL;
1979 SMB_TIME_T min_pwd_age = 0;
1980
1981 if (policy) {
1982 min_pwd_age = policy->min_passwordage;
1983 }
1984
1985 /* FIXME: avoid to send multiple PAM messages after another */
1986 switch (reject_reason) {
1987 case -1:
1988 break;
1989 case WBC_PWD_CHANGE_NO_ERROR:
1990 if ((min_pwd_age > 0) &&
1991 (pwd_last_set + min_pwd_age > time(NULL))) {
1992 PAM_WB_REMARK_DIRECT(ctx,
1993 "NT_STATUS_PWD_TOO_RECENT");
1994 }
1995 break;
1996 case WBC_PWD_CHANGE_PASSWORD_TOO_SHORT:
1997 PAM_WB_REMARK_DIRECT(ctx,
1998 "NT_STATUS_PWD_TOO_SHORT");
1999 break;
2000 case WBC_PWD_CHANGE_PWD_IN_HISTORY:
2001 PAM_WB_REMARK_DIRECT(ctx,
2002 "NT_STATUS_PWD_HISTORY_CONFLICT");
2003 break;
2004 case WBC_PWD_CHANGE_NOT_COMPLEX:
2005 _make_remark(ctx, PAM_ERROR_MSG,
2006 _("Password does not meet "
2007 "complexity requirements"));
2008 break;
2009 default:
2010 _pam_log_debug(ctx, LOG_DEBUG,
2011 "unknown password change "
2012 "reject reason: %d",
2013 reject_reason);
2014 break;
2015 }
2016
2017 pwd_restriction_string =
2018 _pam_compose_pwd_restriction_string(ctx, policy);
2019 if (pwd_restriction_string) {
2020 _make_remark(ctx, PAM_ERROR_MSG,
2021 pwd_restriction_string);
2022 TALLOC_FREE(pwd_restriction_string);
2023 }
2024 }
2025 done:
2026 wbcFreeMemory(error);
2027 wbcFreeMemory(policy);
2028
2029 return ret;
2030 }
2031
2032 /*
2033 * Checks if a user has an account
2034 *
2035 * return values:
2036 * 1 = User not found
2037 * 0 = OK
2038 * -1 = System error
2039 */
2040 static int valid_user(struct pwb_context *ctx,
2041 const char *user)
2042 {
2043 /* check not only if the user is available over NSS calls, also make
2044 * sure it's really a winbind user, this is important when stacking PAM
2045 * modules in the 'account' or 'password' facility. */
2046
2047 wbcErr wbc_status;
2048 struct passwd *pwd = NULL;
2049 struct passwd *wb_pwd = NULL;
2050
2051 pwd = getpwnam(user);
2052 if (pwd == NULL) {
2053 return 1;
2054 }
2055
2056 wbc_status = wbcGetpwnam(user, &wb_pwd);
2057 wbcFreeMemory(wb_pwd);
2058 if (!WBC_ERROR_IS_OK(wbc_status)) {
2059 _pam_log(ctx, LOG_DEBUG, "valid_user: wbcGetpwnam gave %s\n",
2060 wbcErrorString(wbc_status));
2061 }
2062
2063 switch (wbc_status) {
2064 case WBC_ERR_UNKNOWN_USER:
2065 /* match other insane libwbclient return codes */
2066 case WBC_ERR_WINBIND_NOT_AVAILABLE:
2067 case WBC_ERR_DOMAIN_NOT_FOUND:
2068 return 1;
2069 case WBC_ERR_SUCCESS:
2070 return 0;
2071 default:
2072 break;
2073 }
2074 return -1;
2075 }
2076
2077 static char *_pam_delete(register char *xx)
2078 {
2079 _pam_overwrite(xx);
2080 _pam_drop(xx);
2081 return NULL;
2082 }
2083
2084 /*
2085 * obtain a password from the user
2086 */
2087
2088 static int _winbind_read_password(struct pwb_context *ctx,
2089 unsigned int ctrl,
2090 const char *comment,
2091 const char *prompt1,
2092 const char *prompt2,
2093 const char **pass)
2094 {
2095 int authtok_flag;
2096 int retval;
2097 const char *item;
2098 char *token;
2099
2100 _pam_log(ctx, LOG_DEBUG, "getting password (0x%08x)", ctrl);
2101
2102 /*
2103 * make sure nothing inappropriate gets returned
2104 */
2105
2106 *pass = token = NULL;
2107
2108 /*
2109 * which authentication token are we getting?
2110 */
2111
2112 if (on(WINBIND__OLD_PASSWORD, ctrl)) {
2113 authtok_flag = PAM_OLDAUTHTOK;
2114 } else {
2115 authtok_flag = PAM_AUTHTOK;
2116 }
2117
2118 /*
2119 * should we obtain the password from a PAM item ?
2120 */
2121
2122 if (on(WINBIND_TRY_FIRST_PASS_ARG, ctrl) ||
2123 on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2124 retval = _pam_get_item(ctx->pamh, authtok_flag, &item);
2125 if (retval != PAM_SUCCESS) {
2126 /* very strange. */
2127 _pam_log(ctx, LOG_ALERT,
2128 "pam_get_item returned error "
2129 "to unix-read-password");
2130 return retval;
2131 } else if (item != NULL) { /* we have a password! */
2132 *pass = item;
2133 item = NULL;
2134 _pam_log(ctx, LOG_DEBUG,
2135 "pam_get_item returned a password");
2136 return PAM_SUCCESS;
2137 } else if (on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2138 return PAM_AUTHTOK_RECOVER_ERR; /* didn't work */
2139 } else if (on(WINBIND_USE_AUTHTOK_ARG, ctrl)
2140 && off(WINBIND__OLD_PASSWORD, ctrl)) {
2141 return PAM_AUTHTOK_RECOVER_ERR;
2142 }
2143 }
2144 /*
2145 * getting here implies we will have to get the password from the
2146 * user directly.
2147 */
2148
2149 {
2150 struct pam_message msg[3], *pmsg[3];
2151 struct pam_response *resp;
2152 int i, replies;
2153
2154 /* prepare to converse */
2155
2156 if (comment != NULL && off(ctrl, WINBIND_SILENT)) {
2157 pmsg[0] = &msg[0];
2158 msg[0].msg_style = PAM_TEXT_INFO;
2159 msg[0].msg = discard_const_p(char, comment);
2160 i = 1;
2161 } else {
2162 i = 0;
2163 }
2164
2165 pmsg[i] = &msg[i];
2166 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2167 msg[i++].msg = discard_const_p(char, prompt1);
2168 replies = 1;
2169
2170 if (prompt2 != NULL) {
2171 pmsg[i] = &msg[i];
2172 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2173 msg[i++].msg = discard_const_p(char, prompt2);
2174 ++replies;
2175 }
2176 /* so call the conversation expecting i responses */
2177 resp = NULL;
2178 retval = converse(ctx->pamh, i, pmsg, &resp);
2179 if (resp == NULL) {
2180 if (retval == PAM_SUCCESS) {
2181 retval = PAM_AUTHTOK_RECOVER_ERR;
2182 }
2183 goto done;
2184 }
2185 if (retval != PAM_SUCCESS) {
2186 _pam_drop_reply(resp, i);
2187 goto done;
2188 }
2189
2190 /* interpret the response */
2191
2192 token = x_strdup(resp[i - replies].resp);
2193 if (!token) {
2194 _pam_log(ctx, LOG_NOTICE,
2195 "could not recover "
2196 "authentication token");
2197 retval = PAM_AUTHTOK_RECOVER_ERR;
2198 goto done;
2199 }
2200
2201 if (replies == 2) {
2202 /* verify that password entered correctly */
2203 if (!resp[i - 1].resp ||
2204 strcmp(token, resp[i - 1].resp)) {
2205 _pam_delete(token); /* mistyped */
2206 retval = PAM_AUTHTOK_RECOVER_ERR;
2207 _make_remark(ctx, PAM_ERROR_MSG,
2208 MISTYPED_PASS);
2209 }
2210 }
2211
2212 /*
2213 * tidy up the conversation (resp_retcode) is ignored
2214 * -- what is it for anyway? AGM
2215 */
2216 _pam_drop_reply(resp, i);
2217 }
2218
2219 done:
2220 if (retval != PAM_SUCCESS) {
2221 _pam_log_debug(ctx, LOG_DEBUG,
2222 "unable to obtain a password");
2223 return retval;
2224 }
2225 /* 'token' is the entered password */
2226
2227 /* we store this password as an item */
2228
2229 retval = pam_set_item(ctx->pamh, authtok_flag, token);
2230 _pam_delete(token); /* clean it up */
2231 if (retval != PAM_SUCCESS ||
2232 (retval = _pam_get_item(ctx->pamh, authtok_flag, &item)) != PAM_SUCCESS) {
2233
2234 _pam_log(ctx, LOG_CRIT, "error manipulating password");
2235 return retval;
2236
2237 }
2238
2239 *pass = item;
2240 item = NULL; /* break link to password */
2241
2242 return PAM_SUCCESS;
2243 }
2244
2245 static const char *get_conf_item_string(struct pwb_context *ctx,
2246 const char *item,
2247 int config_flag)
2248 {
2249 int i = 0;
2250 const char *parm_opt = NULL;
2251
2252 if (!(ctx->ctrl & config_flag)) {
2253 goto out;
2254 }
2255
2256 /* let the pam opt take precedence over the pam_winbind.conf option */
2257 for (i=0; i<ctx->argc; i++) {
2258
2259 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2260 char *p;
2261
2262 if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2263 _pam_log(ctx, LOG_INFO,
2264 "no \"=\" delimiter for \"%s\" found\n",
2265 item);
2266 goto out;
2267 }
2268 _pam_log_debug(ctx, LOG_INFO,
2269 "PAM config: %s '%s'\n", item, p+1);
2270 return p + 1;
2271 }
2272 }
2273
2274 if (ctx->dict) {
2275 char *key = NULL;
2276
2277 key = talloc_asprintf(ctx, "global:%s", item);
2278 if (!key) {
2279 goto out;
2280 }
2281
2282 parm_opt = iniparser_getstring(ctx->dict, key, NULL);
2283 TALLOC_FREE(key);
2284
2285 _pam_log_debug(ctx, LOG_INFO, "CONFIG file: %s '%s'\n",
2286 item, parm_opt);
2287 }
2288 out:
2289 return parm_opt;
2290 }
2291
2292 static int get_config_item_int(struct pwb_context *ctx,
2293 const char *item,
2294 int config_flag)
2295 {
2296 int i, parm_opt = -1;
2297
2298 if (!(ctx->ctrl & config_flag)) {
2299 goto out;
2300 }
2301
2302 /* let the pam opt take precedence over the pam_winbind.conf option */
2303 for (i = 0; i < ctx->argc; i++) {
2304
2305 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2306 char *p;
2307
2308 if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2309 _pam_log(ctx, LOG_INFO,
2310 "no \"=\" delimiter for \"%s\" found\n",
2311 item);
2312 goto out;
2313 }
2314 parm_opt = atoi(p + 1);
2315 _pam_log_debug(ctx, LOG_INFO,
2316 "PAM config: %s '%d'\n",
2317 item, parm_opt);
2318 return parm_opt;
2319 }
2320 }
2321
2322 if (ctx->dict) {
2323 char *key = NULL;
2324
2325 key = talloc_asprintf(ctx, "global:%s", item);
2326 if (!key) {
2327 goto out;
2328 }
2329
2330 parm_opt = iniparser_getint(ctx->dict, key, -1);
2331 TALLOC_FREE(key);
2332
2333 _pam_log_debug(ctx, LOG_INFO,
2334 "CONFIG file: %s '%d'\n",
2335 item, parm_opt);
2336 }
2337 out:
2338 return parm_opt;
2339 }
2340
2341 static const char *get_krb5_cc_type_from_config(struct pwb_context *ctx)
2342 {
2343 return get_conf_item_string(ctx, "krb5_ccache_type",
2344 WINBIND_KRB5_CCACHE_TYPE);
2345 }
2346
2347 static const char *get_member_from_config(struct pwb_context *ctx)
2348 {
2349 const char *ret = NULL;
2350 ret = get_conf_item_string(ctx, "require_membership_of",
2351 WINBIND_REQUIRED_MEMBERSHIP);
2352 if (ret) {
2353 return ret;
2354 }
2355 return get_conf_item_string(ctx, "require-membership-of",
2356 WINBIND_REQUIRED_MEMBERSHIP);
2357 }
2358
2359 static int get_warn_pwd_expire_from_config(struct pwb_context *ctx)
2360 {
2361 int ret;
2362 ret = get_config_item_int(ctx, "warn_pwd_expire",
2363 WINBIND_WARN_PWD_EXPIRE);
2364 /* no or broken setting */
2365 if (ret <= 0) {
2366 return DEFAULT_DAYS_TO_WARN_BEFORE_PWD_EXPIRES;
2367 }
2368 return ret;
2369 }
2370
2371 /**
2372 * Retrieve the winbind separator.
2373 *
2374 * @param ctx PAM winbind context.
2375 *
2376 * @return string separator character. NULL on failure.
2377 */
2378
2379 static char winbind_get_separator(struct pwb_context *ctx)
2380 {
2381 wbcErr wbc_status;
2382 static struct wbcInterfaceDetails *details = NULL;
2383
2384 wbc_status = wbcInterfaceDetails(&details);
2385 if (!WBC_ERROR_IS_OK(wbc_status)) {
2386 _pam_log(ctx, LOG_ERR,
2387 "Could not retrieve winbind interface details: %s",
2388 wbcErrorString(wbc_status));
2389 return '\0';
2390 }
2391
2392 if (!details) {
2393 return '\0';
2394 }
2395
2396 return details->winbind_separator;
2397 }
2398
2399
2400 /**
2401 * Convert a upn to a name.
2402 *
2403 * @param ctx PAM winbind context.
2404 * @param upn USer UPN to be trabslated.
2405 *
2406 * @return converted name. NULL pointer on failure. Caller needs to free.
2407 */
2408
2409 static char* winbind_upn_to_username(struct pwb_context *ctx,
2410 const char *upn)
2411 {
2412 char sep;
2413 wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;
2414 struct wbcDomainSid sid;
2415 enum wbcSidType type;
2416 char *domain = NULL;
2417 char *name;
2418 char *p;
2419
2420 /* This cannot work when the winbind separator = @ */
2421
2422 sep = winbind_get_separator(ctx);
2423 if (!sep || sep == '@') {
2424 return NULL;
2425 }
2426
2427 name = talloc_strdup(ctx, upn);
2428 if (!name) {
2429 return NULL;
2430 }
2431 if ((p = strchr(name, '@')) != NULL) {
2432 *p = 0;
2433 domain = p + 1;
2434 }
2435
2436 /* Convert the UPN to a SID */
2437
2438 wbc_status = wbcLookupName(domain, name, &sid, &type);
2439 if (!WBC_ERROR_IS_OK(wbc_status)) {
2440 return NULL;
2441 }
2442
2443 /* Convert the the SID back to the sAMAccountName */
2444
2445 wbc_status = wbcLookupSid(&sid, &domain, &name, &type);
2446 if (!WBC_ERROR_IS_OK(wbc_status)) {
2447 return NULL;
2448 }
2449
2450 return talloc_asprintf(ctx, "%s\\%s", domain, name);
2451 }
2452
2453 static int _pam_delete_cred(pam_handle_t *pamh, int flags,
2454 int argc, const char **argv)
2455 {
2456 int retval = PAM_SUCCESS;
2457 struct pwb_context *ctx = NULL;
2458 struct wbcLogoffUserParams logoff;
2459 struct wbcAuthErrorInfo *error = NULL;
2460 const char *user;
2461 wbcErr wbc_status = WBC_ERR_SUCCESS;
2462
2463 ZERO_STRUCT(logoff);
2464
2465 retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2466 if (retval) {
2467 goto out;
2468 }
2469
2470 _PAM_LOG_FUNCTION_ENTER("_pam_delete_cred", ctx);
2471
2472 if (ctx->ctrl & WINBIND_KRB5_AUTH) {
2473
2474 /* destroy the ccache here */
2475
2476 uint32_t wbc_flags = 0;
2477 const char *ccname = NULL;
2478 struct passwd *pwd = NULL;
2479
2480 retval = pam_get_user(pamh, &user, _("Username: "));
2481 if (retval) {
2482 _pam_log(ctx, LOG_ERR,
2483 "could not identify user");
2484 goto out;
2485 }
2486
2487 if (user == NULL) {
2488 _pam_log(ctx, LOG_ERR,
2489 "username was NULL!");
2490 retval = PAM_USER_UNKNOWN;
2491 goto out;
2492 }
2493
2494 _pam_log_debug(ctx, LOG_DEBUG,
2495 "username [%s] obtained", user);
2496
2497 ccname = pam_getenv(pamh, "KRB5CCNAME");
2498 if (ccname == NULL) {
2499 _pam_log_debug(ctx, LOG_DEBUG,
2500 "user has no KRB5CCNAME environment");
2501 }
2502
2503 pwd = getpwnam(user);
2504 if (pwd == NULL) {
2505 retval = PAM_USER_UNKNOWN;
2506 goto out;
2507 }
2508
2509 wbc_flags = WBFLAG_PAM_KRB5 |
2510 WBFLAG_PAM_CONTACT_TRUSTDOM;
2511
2512 logoff.username = user;
2513
2514 if (ccname) {
2515 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2516 &logoff.blobs,
2517 "ccfilename",
2518 0,
2519 discard_const_p(uint8_t, ccname),
2520 strlen(ccname)+1);
2521 if (!WBC_ERROR_IS_OK(wbc_status)) {
2522 goto out;
2523 }
2524 }
2525
2526 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2527 &logoff.blobs,
2528 "flags",
2529 0,
2530 (uint8_t *)&wbc_flags,
2531 sizeof(wbc_flags));
2532 if (!WBC_ERROR_IS_OK(wbc_status)) {
2533 goto out;
2534 }
2535
2536 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2537 &logoff.blobs,
2538 "user_uid",
2539 0,
2540 (uint8_t *)&pwd->pw_uid,
2541 sizeof(pwd->pw_uid));
2542 if (!WBC_ERROR_IS_OK(wbc_status)) {
2543 goto out;
2544 }
2545
2546 wbc_status = wbcLogoffUserEx(&logoff, &error);
2547 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2548 user, "wbcLogoffUser");
2549 wbcFreeMemory(error);
2550 wbcFreeMemory(logoff.blobs);
2551 logoff.blobs = NULL;
2552
2553 if (!WBC_ERROR_IS_OK(wbc_status)) {
2554 _pam_log(ctx, LOG_INFO,
2555 "failed to logoff user %s: %s\n",
2556 user, wbcErrorString(wbc_status));
2557 }
2558 }
2559
2560 out:
2561 if (logoff.blobs) {
2562 wbcFreeMemory(logoff.blobs);
2563 }
2564
2565 if (!WBC_ERROR_IS_OK(wbc_status)) {
2566 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2567 user, "wbcLogoffUser");
2568 }
2569
2570 /*
2571 * Delete the krb5 ccname variable from the PAM environment
2572 * if it was set by winbind.
2573 */
2574 if ((ctx->ctrl & WINBIND_KRB5_AUTH) && pam_getenv(pamh, "KRB5CCNAME")) {
2575 pam_putenv(pamh, "KRB5CCNAME");
2576 }
2577
2578 _PAM_LOG_FUNCTION_LEAVE("_pam_delete_cred", ctx, retval);
2579
2580 TALLOC_FREE(ctx);
2581
2582 return retval;
2583 }
2584
2585 PAM_EXTERN
2586 int pam_sm_authenticate(pam_handle_t *pamh, int flags,
2587 int argc, const char **argv)
2588 {
2589 const char *username;
2590 const char *password;
2591 const char *member = NULL;
2592 const char *cctype = NULL;
2593 int warn_pwd_expire;
2594 int retval = PAM_AUTH_ERR;
2595 char *username_ret = NULL;
2596 char *new_authtok_required = NULL;
2597 char *real_username = NULL;
2598 struct pwb_context *ctx = NULL;
2599
2600 retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2601 if (retval) {
2602 goto out;
2603 }
2604
2605 _PAM_LOG_FUNCTION_ENTER("pam_sm_authenticate", ctx);
2606
2607 /* Get the username */
2608 retval = pam_get_user(pamh, &username, NULL);
2609 if ((retval != PAM_SUCCESS) || (!username)) {
2610 _pam_log_debug(ctx, LOG_DEBUG,
2611 "can not get the username");
2612 retval = PAM_SERVICE_ERR;
2613 goto out;
2614 }
2615
2616
2617 #if defined(AIX)
2618 /* Decode the user name since AIX does not support logn user
2619 names by default. The name is encoded as _#uid. */
2620
2621 if (username[0] == '_') {
2622 uid_t id = atoi(&username[1]);
2623 struct passwd *pw = NULL;
2624
2625 if ((id!=0) && ((pw = getpwuid(id)) != NULL)) {
2626 real_username = strdup(pw->pw_name);
2627 }
2628 }
2629 #endif
2630
2631 if (!real_username) {
2632 /* Just making a copy of the username we got from PAM */
2633 if ((real_username = strdup(username)) == NULL) {
2634 _pam_log_debug(ctx, LOG_DEBUG,
2635 "memory allocation failure when copying "
2636 "username");
2637 retval = PAM_SERVICE_ERR;
2638 goto out;
2639 }
2640 }
2641
2642 /* Maybe this was a UPN */
2643
2644 if (strchr(real_username, '@') != NULL) {
2645 char *samaccountname = NULL;
2646
2647 samaccountname = winbind_upn_to_username(ctx,
2648 real_username);
2649 if (samaccountname) {
2650 free(real_username);
2651 real_username = strdup(samaccountname);
2652 }
2653 }
2654
2655 retval = _winbind_read_password(ctx, ctx->ctrl, NULL,
2656 _("Password: "), NULL,
2657 &password);
2658
2659 if (retval != PAM_SUCCESS) {
2660 _pam_log(ctx, LOG_ERR,
2661 "Could not retrieve user's password");
2662 retval = PAM_AUTHTOK_ERR;
2663 goto out;
2664 }
2665
2666 /* Let's not give too much away in the log file */
2667
2668 #ifdef DEBUG_PASSWORD
2669 _pam_log_debug(ctx, LOG_INFO,
2670 "Verify user '%s' with password '%s'",
2671 real_username, password);
2672 #else
2673 _pam_log_debug(ctx, LOG_INFO,
2674 "Verify user '%s'", real_username);
2675 #endif
2676
2677 member = get_member_from_config(ctx);
2678 cctype = get_krb5_cc_type_from_config(ctx);
2679 warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
2680
2681 /* Now use the username to look up password */
2682 retval = winbind_auth_request(ctx, real_username, password,
2683 member, cctype, warn_pwd_expire,
2684 NULL, NULL, NULL,
2685 NULL, &username_ret);
2686
2687 if (retval == PAM_NEW_AUTHTOK_REQD ||
2688 retval == PAM_AUTHTOK_EXPIRED) {
2689
2690 char *new_authtok_required_during_auth = NULL;
2691
2692 new_authtok_required = talloc_asprintf(NULL, "%d", retval);
2693 if (!new_authtok_required) {
2694 retval = PAM_BUF_ERR;
2695 goto out;
2696 }
2697
2698 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2699 new_authtok_required,
2700 _pam_winbind_cleanup_func);
2701
2702 retval = PAM_SUCCESS;
2703
2704 new_authtok_required_during_auth = talloc_asprintf(NULL, "%d", true);
2705 if (!new_authtok_required_during_auth) {
2706 retval = PAM_BUF_ERR;
2707 goto out;
2708 }
2709
2710 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2711 new_authtok_required_during_auth,
2712 _pam_winbind_cleanup_func);
2713
2714 goto out;
2715 }
2716
2717 out:
2718 if (username_ret) {
2719 pam_set_item (pamh, PAM_USER, username_ret);
2720 _pam_log_debug(ctx, LOG_INFO,
2721 "Returned user was '%s'", username_ret);
2722 free(username_ret);
2723 }
2724
2725 if (real_username) {
2726 free(real_username);
2727 }
2728
2729 if (!new_authtok_required) {
2730 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, NULL, NULL);
2731 }
2732
2733 if (retval != PAM_SUCCESS) {
2734 _pam_free_data_info3(pamh);
2735 }
2736
2737 if (ctx != NULL) {
2738 _PAM_LOG_FUNCTION_LEAVE("pam_sm_authenticate", ctx, retval);
2739 TALLOC_FREE(ctx);
2740 }
2741
2742 return retval;
2743 }
2744
2745 PAM_EXTERN
2746 int pam_sm_setcred(pam_handle_t *pamh, int flags,
2747 int argc, const char **argv)
2748 {
2749 int ret = PAM_SYSTEM_ERR;
2750 struct pwb_context *ctx = NULL;
2751
2752 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2753 if (ret) {
2754 goto out;
2755 }
2756
2757 _PAM_LOG_FUNCTION_ENTER("pam_sm_setcred", ctx);
2758
2759 switch (flags & ~PAM_SILENT) {
2760
2761 case PAM_DELETE_CRED:
2762 ret = _pam_delete_cred(pamh, flags, argc, argv);
2763 break;
2764 case PAM_REFRESH_CRED:
2765 _pam_log_debug(ctx, LOG_WARNING,
2766 "PAM_REFRESH_CRED not implemented");
2767 ret = PAM_SUCCESS;
2768 break;
2769 case PAM_REINITIALIZE_CRED:
2770 _pam_log_debug(ctx, LOG_WARNING,
2771 "PAM_REINITIALIZE_CRED not implemented");
2772 ret = PAM_SUCCESS;
2773 break;
2774 case PAM_ESTABLISH_CRED:
2775 _pam_log_debug(ctx, LOG_WARNING,
2776 "PAM_ESTABLISH_CRED not implemented");
2777 ret = PAM_SUCCESS;
2778 break;
2779 default:
2780 ret = PAM_SYSTEM_ERR;
2781 break;
2782 }
2783
2784 out:
2785
2786 _PAM_LOG_FUNCTION_LEAVE("pam_sm_setcred", ctx, ret);
2787
2788 TALLOC_FREE(ctx);
2789
2790 return ret;
2791 }
2792
2793 /*
2794 * Account management. We want to verify that the account exists
2795 * before returning PAM_SUCCESS
2796 */
2797 PAM_EXTERN
2798 int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
2799 int argc, const char **argv)
2800 {
2801 const char *username;
2802 int ret = PAM_USER_UNKNOWN;
2803 void *tmp = NULL;
2804 struct pwb_context *ctx = NULL;
2805
2806 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2807 if (ret) {
2808 goto out;
2809 }
2810
2811 _PAM_LOG_FUNCTION_ENTER("pam_sm_acct_mgmt", ctx);
2812
2813
2814 /* Get the username */
2815 ret = pam_get_user(pamh, &username, NULL);
2816 if ((ret != PAM_SUCCESS) || (!username)) {
2817 _pam_log_debug(ctx, LOG_DEBUG,
2818 "can not get the username");
2819 ret = PAM_SERVICE_ERR;
2820 goto out;
2821 }
2822
2823 /* Verify the username */
2824 ret = valid_user(ctx, username);
2825 switch (ret) {
2826 case -1:
2827 /* some sort of system error. The log was already printed */
2828 ret = PAM_SERVICE_ERR;
2829 goto out;
2830 case 1:
2831 /* the user does not exist */
2832 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
2833 username);
2834 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
2835 ret = PAM_IGNORE;
2836 goto out;
2837 }
2838 ret = PAM_USER_UNKNOWN;
2839 goto out;
2840 case 0:
2841 pam_get_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2842 (const void **)&tmp);
2843 if (tmp != NULL) {
2844 ret = atoi((const char *)tmp);
2845 switch (ret) {
2846 case PAM_AUTHTOK_EXPIRED:
2847 /* fall through, since new token is required in this case */
2848 case PAM_NEW_AUTHTOK_REQD:
2849 _pam_log(ctx, LOG_WARNING,
2850 "pam_sm_acct_mgmt success but %s is set",
2851 PAM_WINBIND_NEW_AUTHTOK_REQD);
2852 _pam_log(ctx, LOG_NOTICE,
2853 "user '%s' needs new password",
2854 username);
2855 /* PAM_AUTHTOKEN_REQD does not exist, but is documented in the manpage */
2856 ret = PAM_NEW_AUTHTOK_REQD;
2857 goto out;
2858 default:
2859 _pam_log(ctx, LOG_WARNING,
2860 "pam_sm_acct_mgmt success");
2861 _pam_log(ctx, LOG_NOTICE,
2862 "user '%s' granted access", username);
2863 ret = PAM_SUCCESS;
2864 goto out;
2865 }
2866 }
2867
2868 /* Otherwise, the authentication looked good */
2869 _pam_log(ctx, LOG_NOTICE,
2870 "user '%s' granted access", username);
2871 ret = PAM_SUCCESS;
2872 goto out;
2873 default:
2874 /* we don't know anything about this return value */
2875 _pam_log(ctx, LOG_ERR,
2876 "internal module error (ret = %d, user = '%s')",
2877 ret, username);
2878 ret = PAM_SERVICE_ERR;
2879 goto out;
2880 }
2881
2882 /* should not be reached */
2883 ret = PAM_IGNORE;
2884
2885 out:
2886
2887 _PAM_LOG_FUNCTION_LEAVE("pam_sm_acct_mgmt", ctx, ret);
2888
2889 TALLOC_FREE(ctx);
2890
2891 return ret;
2892 }
2893
2894 PAM_EXTERN
2895 int pam_sm_open_session(pam_handle_t *pamh, int flags,
2896 int argc, const char **argv)
2897 {
2898 int ret = PAM_SUCCESS;
2899 struct pwb_context *ctx = NULL;
2900
2901 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2902 if (ret) {
2903 goto out;
2904 }
2905
2906 _PAM_LOG_FUNCTION_ENTER("pam_sm_open_session", ctx);
2907
2908 if (ctx->ctrl & WINBIND_MKHOMEDIR) {
2909 /* check and create homedir */
2910 ret = _pam_mkhomedir(ctx);
2911 }
2912 out:
2913 _PAM_LOG_FUNCTION_LEAVE("pam_sm_open_session", ctx, ret);
2914
2915 TALLOC_FREE(ctx);
2916
2917 return ret;
2918 }
2919
2920 PAM_EXTERN
2921 int pam_sm_close_session(pam_handle_t *pamh, int flags,
2922 int argc, const char **argv)
2923 {
2924 int ret = PAM_SUCCESS;
2925 struct pwb_context *ctx = NULL;
2926
2927 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2928 if (ret) {
2929 goto out;
2930 }
2931
2932 _PAM_LOG_FUNCTION_ENTER("pam_sm_close_session", ctx);
2933
2934 out:
2935 _PAM_LOG_FUNCTION_LEAVE("pam_sm_close_session", ctx, ret);
2936
2937 TALLOC_FREE(ctx);
2938
2939 return ret;
2940 }
2941
2942 /**
2943 * evaluate whether we need to re-authenticate with kerberos after a
2944 * password change
2945 *
2946 * @param ctx PAM winbind context.
2947 * @param user The username
2948 *
2949 * @return boolean Returns true if required, false if not.
2950 */
2951
2952 static bool _pam_require_krb5_auth_after_chauthtok(struct pwb_context *ctx,
2953 const char *user)
2954 {
2955
2956 /* Make sure that we only do this if a) the chauthtok got initiated
2957 * during a logon attempt (authenticate->acct_mgmt->chauthtok) b) any
2958 * later password change via the "passwd" command if done by the user
2959 * itself
2960 * NB. If we login from gdm or xdm and the password expires,
2961 * we change the password, but there is no memory cache.
2962 * Thus, even for passthrough login, we should do the
2963 * authentication again to update memory cache.
2964 * --- BoYang
2965 * */
2966
2967 char *new_authtok_reqd_during_auth = NULL;
2968 struct passwd *pwd = NULL;
2969
2970 _pam_get_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2971 &new_authtok_reqd_during_auth);
2972 pam_set_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2973 NULL, NULL);
2974
2975 if (new_authtok_reqd_during_auth) {
2976 return true;
2977 }
2978
2979 pwd = getpwnam(user);
2980 if (!pwd) {
2981 return false;
2982 }
2983
2984 if (getuid() == pwd->pw_uid) {
2985 return true;
2986 }
2987
2988 return false;
2989 }
2990
2991
2992 PAM_EXTERN
2993 int pam_sm_chauthtok(pam_handle_t * pamh, int flags,
2994 int argc, const char **argv)
2995 {
2996 unsigned int lctrl;
2997 int ret;
2998 bool cached_login = false;
2999
3000 /* <DO NOT free() THESE> */
3001 const char *user;
3002 char *pass_old, *pass_new;
3003 /* </DO NOT free() THESE> */
3004
3005 char *Announce;
3006
3007 int retry = 0;
3008 char *username_ret = NULL;
3009 struct wbcAuthErrorInfo *error = NULL;
3010 struct pwb_context *ctx = NULL;
3011
3012 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
3013 if (ret) {
3014 goto out;
3015 }
3016
3017 _PAM_LOG_FUNCTION_ENTER("pam_sm_chauthtok", ctx);
3018
3019 cached_login = (ctx->ctrl & WINBIND_CACHED_LOGIN);
3020
3021 /* clearing offline bit for auth */
3022 ctx->ctrl &= ~WINBIND_CACHED_LOGIN;
3023
3024 /*
3025 * First get the name of a user
3026 */
3027 ret = pam_get_user(pamh, &user, _("Username: "));
3028 if (ret) {
3029 _pam_log(ctx, LOG_ERR,
3030 "password - could not identify user");
3031 goto out;
3032 }
3033
3034 if (user == NULL) {
3035 _pam_log(ctx, LOG_ERR, "username was NULL!");
3036 ret = PAM_USER_UNKNOWN;
3037 goto out;
3038 }
3039
3040 _pam_log_debug(ctx, LOG_DEBUG, "username [%s] obtained", user);
3041
3042 /* check if this is really a user in winbindd, not only in NSS */
3043 ret = valid_user(ctx, user);
3044 switch (ret) {
3045 case 1:
3046 ret = PAM_USER_UNKNOWN;
3047 goto out;
3048 case -1:
3049 ret = PAM_SYSTEM_ERR;
3050 goto out;
3051 default:
3052 break;
3053 }
3054
3055 /*
3056 * obtain and verify the current password (OLDAUTHTOK) for
3057 * the user.
3058 */
3059
3060 if (flags & PAM_PRELIM_CHECK) {
3061 time_t pwdlastset_prelim = 0;
3062
3063 /* instruct user what is happening */
3064
3065 #define greeting _("Changing password for")
3066 Announce = talloc_asprintf(ctx, "%s %s", greeting, user);
3067 if (!Announce) {
3068 _pam_log(ctx, LOG_CRIT,
3069 "password - out of memory");
3070 ret = PAM_BUF_ERR;
3071 goto out;
3072 }
3073 #undef greeting
3074
3075 lctrl = ctx->ctrl | WINBIND__OLD_PASSWORD;
3076 ret = _winbind_read_password(ctx, lctrl,
3077 Announce,
3078 _("(current) NT password: "),
3079 NULL,
3080 (const char **) &pass_old);
3081 TALLOC_FREE(Announce);
3082 if (ret != PAM_SUCCESS) {
3083 _pam_log(ctx, LOG_NOTICE,
3084 "password - (old) token not obtained");
3085 goto out;
3086 }
3087
3088 /* verify that this is the password for this user */
3089
3090 ret = winbind_auth_request(ctx, user, pass_old,
3091 NULL, NULL, 0,
3092 &error, NULL, NULL,
3093 &pwdlastset_prelim, NULL);
3094
3095 if (ret != PAM_ACCT_EXPIRED &&
3096 ret != PAM_AUTHTOK_EXPIRED &&
3097 ret != PAM_NEW_AUTHTOK_REQD &&
3098 ret != PAM_SUCCESS) {
3099 pass_old = NULL;
3100 goto out;
3101 }
3102
3103 pam_set_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3104 (void *)pwdlastset_prelim, NULL);
3105
3106 ret = pam_set_item(pamh, PAM_OLDAUTHTOK,
3107 (const void *) pass_old);
3108 pass_old = NULL;
3109 if (ret != PAM_SUCCESS) {
3110 _pam_log(ctx, LOG_CRIT,
3111 "failed to set PAM_OLDAUTHTOK");
3112 }
3113 } else if (flags & PAM_UPDATE_AUTHTOK) {
3114
3115 time_t pwdlastset_update = 0;
3116
3117 /*
3118 * obtain the proposed password
3119 */
3120
3121 /*
3122 * get the old token back.
3123 */
3124
3125 ret = _pam_get_item(pamh, PAM_OLDAUTHTOK, &pass_old);
3126
3127 if (ret != PAM_SUCCESS) {
3128 _pam_log(ctx, LOG_NOTICE,
3129 "user not authenticated");
3130 goto out;
3131 }
3132
3133 lctrl = ctx->ctrl & ~WINBIND_TRY_FIRST_PASS_ARG;
3134
3135 if (on(WINBIND_USE_AUTHTOK_ARG, lctrl)) {
3136 lctrl |= WINBIND_USE_FIRST_PASS_ARG;
3137 }
3138 retry = 0;
3139 ret = PAM_AUTHTOK_ERR;
3140 while ((ret != PAM_SUCCESS) && (retry++ < MAX_PASSWD_TRIES)) {
3141 /*
3142 * use_authtok is to force the use of a previously entered
3143 * password -- needed for pluggable password strength checking
3144 */
3145
3146 ret = _winbind_read_password(ctx, lctrl,
3147 NULL,
3148 _("Enter new NT password: "),
3149 _("Retype new NT password: "),
3150 (const char **)&pass_new);
3151
3152 if (ret != PAM_SUCCESS) {
3153 _pam_log_debug(ctx, LOG_ALERT,
3154 "password - "
3155 "new password not obtained");
3156 pass_old = NULL;/* tidy up */
3157 goto out;
3158 }
3159
3160 /*
3161 * At this point we know who the user is and what they
3162 * propose as their new password. Verify that the new
3163 * password is acceptable.
3164 */
3165
3166 if (pass_new[0] == '\0') {/* "\0" password = NULL */
3167 pass_new = NULL;
3168 }
3169 }
3170
3171 /*
3172 * By reaching here we have approved the passwords and must now
3173 * rebuild the password database file.
3174 */
3175 _pam_get_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3176 &pwdlastset_update);
3177
3178 /*
3179 * if cached creds were enabled, make sure to set the
3180 * WINBIND_CACHED_LOGIN bit here in order to have winbindd
3181 * update the cached creds storage - gd
3182 */
3183 if (cached_login) {
3184 ctx->ctrl |= WINBIND_CACHED_LOGIN;
3185 }
3186
3187 ret = winbind_chauthtok_request(ctx, user, pass_old,
3188 pass_new, pwdlastset_update);
3189 if (ret) {
3190 pass_old = pass_new = NULL;
3191 goto out;
3192 }
3193
3194 if (_pam_require_krb5_auth_after_chauthtok(ctx, user)) {
3195
3196 const char *member = NULL;
3197 const char *cctype = NULL;
3198 int warn_pwd_expire;
3199 struct wbcLogonUserInfo *info = NULL;
3200 struct wbcUserPasswordPolicyInfo *policy = NULL;
3201
3202 member = get_member_from_config(ctx);
3203 cctype = get_krb5_cc_type_from_config(ctx);
3204 warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
3205
3206 /* Keep WINBIND_CACHED_LOGIN bit for
3207 * authentication after changing the password.
3208 * This will update the cached credentials in case
3209 * that winbindd_dual_pam_chauthtok() fails
3210 * to update them.
3211 * --- BoYang
3212 * */
3213
3214 ret = winbind_auth_request(ctx, user, pass_new,
3215 member, cctype, 0,
3216 &error, &info, &policy,
3217 NULL, &username_ret);
3218 pass_old = pass_new = NULL;
3219
3220 if (ret == PAM_SUCCESS) {
3221
3222 struct wbcAuthUserInfo *user_info = NULL;
3223
3224 if (info && info->info) {
3225 user_info = info->info;
3226 }
3227
3228 /* warn a user if the password is about to
3229 * expire soon */
3230 _pam_warn_password_expiry(ctx, user_info, policy,
3231 warn_pwd_expire,
3232 NULL, NULL);
3233
3234 /* set some info3 info for other modules in the
3235 * stack */
3236 _pam_set_data_info3(ctx, user_info);
3237
3238 /* put krb5ccname into env */
3239 _pam_setup_krb5_env(ctx, info);
3240
3241 if (username_ret) {
3242 pam_set_item(pamh, PAM_USER,
3243 username_ret);
3244 _pam_log_debug(ctx, LOG_INFO,
3245 "Returned user was '%s'",
3246 username_ret);
3247 free(username_ret);
3248 }
3249
3250 }
3251
3252 if (info && info->blobs) {
3253 wbcFreeMemory(info->blobs);
3254 }
3255 wbcFreeMemory(info);
3256 wbcFreeMemory(policy);
3257
3258 goto out;
3259 }
3260 } else {
3261 ret = PAM_SERVICE_ERR;
3262 }
3263
3264 out:
3265 {
3266 /* Deal with offline errors. */
3267 int i;
3268 const char *codes[] = {
3269 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
3270 "NT_STATUS_NO_LOGON_SERVERS",
3271 "NT_STATUS_ACCESS_DENIED"
3272 };
3273
3274 for (i=0; i<ARRAY_SIZE(codes); i++) {
3275 int _ret;
3276 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
3277 break;
3278 }
3279 }
3280 }
3281
3282 wbcFreeMemory(error);
3283
3284 _PAM_LOG_FUNCTION_LEAVE("pam_sm_chauthtok", ctx, ret);
3285
3286 TALLOC_FREE(ctx);
3287
3288 return ret;
3289 }
3290
3291 #ifdef PAM_STATIC
3292
3293 /* static module data */
3294
3295 struct pam_module _pam_winbind_modstruct = {
3296 MODULE_NAME,
3297 pam_sm_authenticate,
3298 pam_sm_setcred,
3299 pam_sm_acct_mgmt,
3300 pam_sm_open_session,
3301 pam_sm_close_session,
3302 pam_sm_chauthtok
3303 };
3304
3305 #endif
3306
3307 /*
3308 * Copyright (c) Andrew Tridgell <tridge@samba.org> 2000
3309 * Copyright (c) Tim Potter <tpot@samba.org> 2000
3310 * Copyright (c) Andrew Bartlettt <abartlet@samba.org> 2002
3311 * Copyright (c) Guenther Deschner <gd@samba.org> 2005-2008
3312 * Copyright (c) Jan Rêkorajski 1999.
3313 * Copyright (c) Andrew G. Morgan 1996-8.
3314 * Copyright (c) Alex O. Yuriev, 1996.
3315 * Copyright (c) Cristian Gafton 1996.
3316 * Copyright (C) Elliot Lee <sopwith@redhat.com> 1996, Red Hat Software.
3317 *
3318 * Redistribution and use in source and binary forms, with or without
3319 * modification, are permitted provided that the following conditions
3320 * are met:
3321 * 1. Redistributions of source code must retain the above copyright
3322 * notice, and the entire permission notice in its entirety,
3323 * including the disclaimer of warranties.
3324 * 2. Redistributions in binary form must reproduce the above copyright
3325 * notice, this list of conditions and the following disclaimer in the
3326 * documentation and/or other materials provided with the distribution.
3327 * 3. The name of the author may not be used to endorse or promote
3328 * products derived from this software without specific prior
3329 * written permission.
3330 *
3331 * ALTERNATIVELY, this product may be distributed under the terms of
3332 * the GNU Public License, in which case the provisions of the GPL are
3333 * required INSTEAD OF the above restrictions. (This clause is
3334 * necessary due to a potential bad interaction between the GPL and
3335 * the restrictions contained in a BSD-style copyright.)
3336 *
3337 * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
3338 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
3339 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
3340 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
3341 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
3342 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
3343 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
3344 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
3345 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
3346 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
3347 * OF THE POSSIBILITY OF SUCH DAMAGE.
3348 */