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VERSION: Re-enable GIT_SNAPSHOT.
[Samba.git] / nsswitch / pam_winbind.c
blob757fdae6e3c631d131bbcfdc446a4651d1a4bd76
1 /* pam_winbind module
2
3 Copyright Andrew Tridgell <tridge@samba.org> 2000
4 Copyright Tim Potter <tpot@samba.org> 2000
5 Copyright Andrew Bartlett <abartlet@samba.org> 2002
6 Copyright Guenther Deschner <gd@samba.org> 2005-2008
7
8 largely based on pam_userdb by Cristian Gafton <gafton@redhat.com> also
9 contains large slabs of code from pam_unix by Elliot Lee
10 <sopwith@redhat.com> (see copyright below for full details)
11 */
12
13 #include "pam_winbind.h"
14
15 enum pam_winbind_request_type
16 {
17 PAM_WINBIND_AUTHENTICATE,
18 PAM_WINBIND_SETCRED,
19 PAM_WINBIND_ACCT_MGMT,
20 PAM_WINBIND_OPEN_SESSION,
21 PAM_WINBIND_CLOSE_SESSION,
22 PAM_WINBIND_CHAUTHTOK,
23 PAM_WINBIND_CLEANUP
24 };
25
26 static int wbc_error_to_pam_error(wbcErr status)
27 {
28 switch (status) {
29 case WBC_ERR_SUCCESS:
30 return PAM_SUCCESS;
31 case WBC_ERR_NOT_IMPLEMENTED:
32 return PAM_SERVICE_ERR;
33 case WBC_ERR_UNKNOWN_FAILURE:
34 break;
35 case WBC_ERR_NO_MEMORY:
36 return PAM_BUF_ERR;
37 case WBC_ERR_INVALID_SID:
38 case WBC_ERR_INVALID_PARAM:
39 break;
40 case WBC_ERR_WINBIND_NOT_AVAILABLE:
41 return PAM_AUTHINFO_UNAVAIL;
42 case WBC_ERR_DOMAIN_NOT_FOUND:
43 return PAM_AUTHINFO_UNAVAIL;
44 case WBC_ERR_INVALID_RESPONSE:
45 return PAM_BUF_ERR;
46 case WBC_ERR_NSS_ERROR:
47 return PAM_USER_UNKNOWN;
48 case WBC_ERR_AUTH_ERROR:
49 return PAM_AUTH_ERR;
50 case WBC_ERR_UNKNOWN_USER:
51 return PAM_USER_UNKNOWN;
52 case WBC_ERR_UNKNOWN_GROUP:
53 return PAM_USER_UNKNOWN;
54 case WBC_ERR_PWD_CHANGE_FAILED:
55 break;
56 }
57
58 /* be paranoid */
59 return PAM_AUTH_ERR;
60 }
61
62 static const char *_pam_error_code_str(int err)
63 {
64 switch (err) {
65 case PAM_SUCCESS:
66 return "PAM_SUCCESS";
67 case PAM_OPEN_ERR:
68 return "PAM_OPEN_ERR";
69 case PAM_SYMBOL_ERR:
70 return "PAM_SYMBOL_ERR";
71 case PAM_SERVICE_ERR:
72 return "PAM_SERVICE_ERR";
73 case PAM_SYSTEM_ERR:
74 return "PAM_SYSTEM_ERR";
75 case PAM_BUF_ERR:
76 return "PAM_BUF_ERR";
77 case PAM_PERM_DENIED:
78 return "PAM_PERM_DENIED";
79 case PAM_AUTH_ERR:
80 return "PAM_AUTH_ERR";
81 case PAM_CRED_INSUFFICIENT:
82 return "PAM_CRED_INSUFFICIENT";
83 case PAM_AUTHINFO_UNAVAIL:
84 return "PAM_AUTHINFO_UNAVAIL";
85 case PAM_USER_UNKNOWN:
86 return "PAM_USER_UNKNOWN";
87 case PAM_MAXTRIES:
88 return "PAM_MAXTRIES";
89 case PAM_NEW_AUTHTOK_REQD:
90 return "PAM_NEW_AUTHTOK_REQD";
91 case PAM_ACCT_EXPIRED:
92 return "PAM_ACCT_EXPIRED";
93 case PAM_SESSION_ERR:
94 return "PAM_SESSION_ERR";
95 case PAM_CRED_UNAVAIL:
96 return "PAM_CRED_UNAVAIL";
97 case PAM_CRED_EXPIRED:
98 return "PAM_CRED_EXPIRED";
99 case PAM_CRED_ERR:
100 return "PAM_CRED_ERR";
101 case PAM_NO_MODULE_DATA:
102 return "PAM_NO_MODULE_DATA";
103 case PAM_CONV_ERR:
104 return "PAM_CONV_ERR";
105 case PAM_AUTHTOK_ERR:
106 return "PAM_AUTHTOK_ERR";
107 case PAM_AUTHTOK_RECOVER_ERR:
108 return "PAM_AUTHTOK_RECOVER_ERR";
109 case PAM_AUTHTOK_LOCK_BUSY:
110 return "PAM_AUTHTOK_LOCK_BUSY";
111 case PAM_AUTHTOK_DISABLE_AGING:
112 return "PAM_AUTHTOK_DISABLE_AGING";
113 case PAM_TRY_AGAIN:
114 return "PAM_TRY_AGAIN";
115 case PAM_IGNORE:
116 return "PAM_IGNORE";
117 case PAM_ABORT:
118 return "PAM_ABORT";
119 case PAM_AUTHTOK_EXPIRED:
120 return "PAM_AUTHTOK_EXPIRED";
121 #ifdef PAM_MODULE_UNKNOWN
122 case PAM_MODULE_UNKNOWN:
123 return "PAM_MODULE_UNKNOWN";
124 #endif
125 #ifdef PAM_BAD_ITEM
126 case PAM_BAD_ITEM:
127 return "PAM_BAD_ITEM";
128 #endif
129 #ifdef PAM_CONV_AGAIN
130 case PAM_CONV_AGAIN:
131 return "PAM_CONV_AGAIN";
132 #endif
133 #ifdef PAM_INCOMPLETE
134 case PAM_INCOMPLETE:
135 return "PAM_INCOMPLETE";
136 #endif
137 default:
138 return NULL;
139 }
140 }
141
142 #define _PAM_LOG_FUNCTION_ENTER(function, ctx) \
143 do { \
144 _pam_log_debug(ctx, LOG_DEBUG, "[pamh: %p] ENTER: " \
145 function " (flags: 0x%04x)", ctx->pamh, ctx->flags); \
146 _pam_log_state(ctx); \
147 } while (0)
148
149 #define _PAM_LOG_FUNCTION_LEAVE(function, ctx, retval) \
150 do { \
151 _pam_log_debug(ctx, LOG_DEBUG, "[pamh: %p] LEAVE: " \
152 function " returning %d (%s)", ctx ? ctx->pamh : NULL, retval, \
153 _pam_error_code_str(retval)); \
154 _pam_log_state(ctx); \
155 } while (0)
156
157 /* data tokens */
158
159 #define MAX_PASSWD_TRIES 3
160
161 #ifdef HAVE_GETTEXT
162 static char initialized = 0;
163
164 static inline void textdomain_init(void);
165 static inline void textdomain_init(void)
166 {
167 if (!initialized) {
168 bindtextdomain(MODULE_NAME, LOCALEDIR);
169 initialized = 1;
170 }
171 return;
172 }
173 #endif
174
175
176 /* some syslogging */
177 static void _pam_log_int(const pam_handle_t *pamh,
178 int err,
179 const char *format,
180 va_list args) PRINTF_ATTRIBUTE(3, 0);
181
182 #ifdef HAVE_PAM_VSYSLOG
183 static void _pam_log_int(const pam_handle_t *pamh,
184 int err,
185 const char *format,
186 va_list args)
187 {
188 pam_vsyslog(pamh, err, format, args);
189 }
190 #else
191 static void _pam_log_int(const pam_handle_t *pamh,
192 int err,
193 const char *format,
194 va_list args)
195 {
196 char *base = NULL;
197 va_list args2;
198 const char *service;
199 int ret;
200
201 va_copy(args2, args);
202
203 pam_get_item(pamh, PAM_SERVICE, (const void **) &service);
204
205 ret = vasprintf(&base, format, args);
206 if (ret == -1) {
207 /* what else todo ? */
208 vsyslog(err, format, args2);
209 va_end(args2);
210 return;
211 }
212
213 syslog(err, "%s(%s): %s", MODULE_NAME, service, base);
214 SAFE_FREE(base);
215 va_end(args2);
216 }
217 #endif /* HAVE_PAM_VSYSLOG */
218
219 static bool _pam_log_is_silent(int ctrl)
220 {
221 return on(ctrl, WINBIND_SILENT);
222 }
223
224 static void _pam_log(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
225 static void _pam_log(struct pwb_context *r, int err, const char *format, ...)
226 {
227 va_list args;
228
229 if (_pam_log_is_silent(r->ctrl)) {
230 return;
231 }
232
233 va_start(args, format);
234 _pam_log_int(r->pamh, err, format, args);
235 va_end(args);
236 }
237 static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
238 static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
239 {
240 va_list args;
241
242 if (_pam_log_is_silent(ctrl)) {
243 return;
244 }
245
246 va_start(args, format);
247 _pam_log_int(pamh, err, format, args);
248 va_end(args);
249 }
250
251 static bool _pam_log_is_debug_enabled(int ctrl)
252 {
253 if (ctrl == -1) {
254 return false;
255 }
256
257 if (_pam_log_is_silent(ctrl)) {
258 return false;
259 }
260
261 if (!(ctrl & WINBIND_DEBUG_ARG)) {
262 return false;
263 }
264
265 return true;
266 }
267
268 static bool _pam_log_is_debug_state_enabled(int ctrl)
269 {
270 if (!(ctrl & WINBIND_DEBUG_STATE)) {
271 return false;
272 }
273
274 return _pam_log_is_debug_enabled(ctrl);
275 }
276
277 static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
278 static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...)
279 {
280 va_list args;
281
282 if (!r || !_pam_log_is_debug_enabled(r->ctrl)) {
283 return;
284 }
285
286 va_start(args, format);
287 _pam_log_int(r->pamh, err, format, args);
288 va_end(args);
289 }
290 static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
291 static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
292 {
293 va_list args;
294
295 if (!_pam_log_is_debug_enabled(ctrl)) {
296 return;
297 }
298
299 va_start(args, format);
300 _pam_log_int(pamh, err, format, args);
301 va_end(args);
302 }
303
304 static void _pam_log_state_datum(struct pwb_context *ctx,
305 int item_type,
306 const char *key,
307 int is_string)
308 {
309 const void *data = NULL;
310 if (item_type != 0) {
311 pam_get_item(ctx->pamh, item_type, &data);
312 } else {
313 pam_get_data(ctx->pamh, key, &data);
314 }
315 if (data != NULL) {
316 const char *type = (item_type != 0) ? "ITEM" : "DATA";
317 if (is_string != 0) {
318 _pam_log_debug(ctx, LOG_DEBUG,
319 "[pamh: %p] STATE: %s(%s) = \"%s\" (%p)",
320 ctx->pamh, type, key, (const char *)data,
321 data);
322 } else {
323 _pam_log_debug(ctx, LOG_DEBUG,
324 "[pamh: %p] STATE: %s(%s) = %p",
325 ctx->pamh, type, key, data);
326 }
327 }
328 }
329
330 #define _PAM_LOG_STATE_DATA_POINTER(ctx, module_data_name) \
331 _pam_log_state_datum(ctx, 0, module_data_name, 0)
332
333 #define _PAM_LOG_STATE_DATA_STRING(ctx, module_data_name) \
334 _pam_log_state_datum(ctx, 0, module_data_name, 1)
335
336 #define _PAM_LOG_STATE_ITEM_POINTER(ctx, item_type) \
337 _pam_log_state_datum(ctx, item_type, #item_type, 0)
338
339 #define _PAM_LOG_STATE_ITEM_STRING(ctx, item_type) \
340 _pam_log_state_datum(ctx, item_type, #item_type, 1)
341
342 #ifdef DEBUG_PASSWORD
343 #define _LOG_PASSWORD_AS_STRING 1
344 #else
345 #define _LOG_PASSWORD_AS_STRING 0
346 #endif
347
348 #define _PAM_LOG_STATE_ITEM_PASSWORD(ctx, item_type) \
349 _pam_log_state_datum(ctx, item_type, #item_type, \
350 _LOG_PASSWORD_AS_STRING)
351 /*
352 * wrapper to preserve old behaviour of iniparser which ignored
353 * key values that had no value assigned like
354 * key =
355 * for a key like above newer iniparser will return a zero-length
356 * string, previously iniparser would return NULL
357 *
358 * JRA: For compatibility, tiniparser behaves like iniparser.
359 */
360 static const char *tiniparser_getstring_nonempty(struct tiniparser_dictionary *d,
361 const char *key,
362 const char *def)
363 {
364 const char *ret = tiniparser_getstring(d, key, def);
365 if (ret && strlen(ret) == 0) {
366 ret = NULL;
367 }
368 return ret;
369 }
370
371 static void _pam_log_state(struct pwb_context *ctx)
372 {
373 if (!ctx || !_pam_log_is_debug_state_enabled(ctx->ctrl)) {
374 return;
375 }
376
377 _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_SERVICE);
378 _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER);
379 _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_TTY);
380 _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RHOST);
381 _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RUSER);
382 _PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_OLDAUTHTOK);
383 _PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_AUTHTOK);
384 _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER_PROMPT);
385 _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_CONV);
386 #ifdef PAM_FAIL_DELAY
387 _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_FAIL_DELAY);
388 #endif
389 #ifdef PAM_REPOSITORY
390 _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_REPOSITORY);
391 #endif
392
393 _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_HOMEDIR);
394 _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSCRIPT);
395 _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSERVER);
396 _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_PROFILEPATH);
397 _PAM_LOG_STATE_DATA_STRING(ctx,
398 PAM_WINBIND_NEW_AUTHTOK_REQD);
399 /* Use atoi to get PAM result code */
400 _PAM_LOG_STATE_DATA_STRING(ctx,
401 PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH);
402 _PAM_LOG_STATE_DATA_POINTER(ctx, PAM_WINBIND_PWD_LAST_SET);
403 }
404
405 static int _pam_parse(const pam_handle_t *pamh,
406 int flags,
407 int argc,
408 const char **argv,
409 enum pam_winbind_request_type type,
410 struct tiniparser_dictionary **result_d)
411 {
412 int ctrl = 0;
413 const char *config_file = NULL;
414 int i;
415 const char **v;
416 struct tiniparser_dictionary *d = NULL;
417
418 if (flags & PAM_SILENT) {
419 ctrl |= WINBIND_SILENT;
420 }
421
422 for (i=argc,v=argv; i-- > 0; ++v) {
423 if (!strncasecmp(*v, "config", strlen("config"))) {
424 ctrl |= WINBIND_CONFIG_FILE;
425 config_file = v[i];
426 break;
427 }
428 }
429
430 if (config_file == NULL) {
431 config_file = PAM_WINBIND_CONFIG_FILE;
432 }
433
434 d = tiniparser_load(config_file);
435 if (d == NULL) {
436 goto config_from_pam;
437 }
438
439 if (tiniparser_getboolean(d, "global:debug", false)) {
440 ctrl |= WINBIND_DEBUG_ARG;
441 }
442
443 if (tiniparser_getboolean(d, "global:debug_state", false)) {
444 ctrl |= WINBIND_DEBUG_STATE;
445 }
446
447 if (tiniparser_getboolean(d, "global:cached_login", false)) {
448 ctrl |= WINBIND_CACHED_LOGIN;
449 }
450
451 if (tiniparser_getboolean(d, "global:krb5_auth", false)) {
452 ctrl |= WINBIND_KRB5_AUTH;
453 }
454
455 if (tiniparser_getboolean(d, "global:silent", false)) {
456 ctrl |= WINBIND_SILENT;
457 }
458
459 if (tiniparser_getstring_nonempty(d, "global:krb5_ccache_type", NULL) != NULL) {
460 ctrl |= WINBIND_KRB5_CCACHE_TYPE;
461 }
462
463 if ((tiniparser_getstring_nonempty(d, "global:require-membership-of", NULL)
464 != NULL) ||
465 (tiniparser_getstring_nonempty(d, "global:require_membership_of", NULL)
466 != NULL)) {
467 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
468 }
469
470 if (tiniparser_getboolean(d, "global:try_first_pass", false)) {
471 ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
472 }
473
474 if (tiniparser_getint(d, "global:warn_pwd_expire", 0)) {
475 ctrl |= WINBIND_WARN_PWD_EXPIRE;
476 }
477
478 if (tiniparser_getboolean(d, "global:mkhomedir", false)) {
479 ctrl |= WINBIND_MKHOMEDIR;
480 }
481
482 config_from_pam:
483 /* step through arguments */
484 for (i=argc,v=argv; i-- > 0; ++v) {
485
486 /* generic options */
487 if (!strcmp(*v,"debug"))
488 ctrl |= WINBIND_DEBUG_ARG;
489 else if (!strcasecmp(*v, "debug_state"))
490 ctrl |= WINBIND_DEBUG_STATE;
491 else if (!strcasecmp(*v, "silent"))
492 ctrl |= WINBIND_SILENT;
493 else if (!strcasecmp(*v, "use_authtok"))
494 ctrl |= WINBIND_USE_AUTHTOK_ARG;
495 else if (!strcasecmp(*v, "try_authtok"))
496 ctrl |= WINBIND_TRY_AUTHTOK_ARG;
497 else if (!strcasecmp(*v, "use_first_pass"))
498 ctrl |= WINBIND_USE_FIRST_PASS_ARG;
499 else if (!strcasecmp(*v, "try_first_pass"))
500 ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
501 else if (!strcasecmp(*v, "unknown_ok"))
502 ctrl |= WINBIND_UNKNOWN_OK_ARG;
503 else if ((type == PAM_WINBIND_AUTHENTICATE
504 || type == PAM_WINBIND_SETCRED)
505 && !strncasecmp(*v, "require_membership_of",
506 strlen("require_membership_of")))
507 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
508 else if ((type == PAM_WINBIND_AUTHENTICATE
509 || type == PAM_WINBIND_SETCRED)
510 && !strncasecmp(*v, "require-membership-of",
511 strlen("require-membership-of")))
512 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
513 else if (!strcasecmp(*v, "krb5_auth"))
514 ctrl |= WINBIND_KRB5_AUTH;
515 else if (!strncasecmp(*v, "krb5_ccache_type",
516 strlen("krb5_ccache_type")))
517 ctrl |= WINBIND_KRB5_CCACHE_TYPE;
518 else if (!strcasecmp(*v, "cached_login"))
519 ctrl |= WINBIND_CACHED_LOGIN;
520 else if (!strcasecmp(*v, "mkhomedir"))
521 ctrl |= WINBIND_MKHOMEDIR;
522 else if (!strncasecmp(*v, "warn_pwd_expire",
523 strlen("warn_pwd_expire")))
524 ctrl |= WINBIND_WARN_PWD_EXPIRE;
525 else if (type != PAM_WINBIND_CLEANUP) {
526 __pam_log(pamh, ctrl, LOG_ERR,
527 "pam_parse: unknown option: %s", *v);
528 return -1;
529 }
530
531 }
532
533 if (result_d) {
534 *result_d = d;
535 } else {
536 if (d) {
537 tiniparser_freedict(d);
538 }
539 }
540
541 return ctrl;
542 };
543
544 static int _pam_winbind_free_context(struct pwb_context *ctx)
545 {
546 if (!ctx) {
547 return 0;
548 }
549
550 if (ctx->dict) {
551 tiniparser_freedict(ctx->dict);
552 }
553
554 wbcCtxFree(ctx->wbc_ctx);
555
556 return 0;
557 }
558
559 static int _pam_winbind_init_context(pam_handle_t *pamh,
560 int flags,
561 int argc,
562 const char **argv,
563 enum pam_winbind_request_type type,
564 struct pwb_context **ctx_p)
565 {
566 struct pwb_context *r = NULL;
567 const char *service = NULL;
568 char service_name[32] = {0};
569 int ctrl_code;
570
571 #ifdef HAVE_GETTEXT
572 textdomain_init();
573 #endif
574
575 r = talloc_zero(NULL, struct pwb_context);
576 if (!r) {
577 return PAM_BUF_ERR;
578 }
579
580 talloc_set_destructor(r, _pam_winbind_free_context);
581
582 r->pamh = pamh;
583 r->flags = flags;
584 r->argc = argc;
585 r->argv = argv;
586 ctrl_code = _pam_parse(pamh, flags, argc, argv, type, &r->dict);
587 if (ctrl_code == -1) {
588 TALLOC_FREE(r);
589 return PAM_SYSTEM_ERR;
590 }
591 r->ctrl = ctrl_code;
592
593 r->wbc_ctx = wbcCtxCreate();
594 if (r->wbc_ctx == NULL) {
595 TALLOC_FREE(r);
596 return PAM_SYSTEM_ERR;
597 }
598
599 pam_get_item(pamh, PAM_SERVICE, (const void **)&service);
600
601 snprintf(service_name, sizeof(service_name), "PAM_WINBIND[%s]", service);
602
603 wbcSetClientProcessName(service_name);
604
605 *ctx_p = r;
606
607 return PAM_SUCCESS;
608 }
609
610 static void _pam_winbind_cleanup_func(pam_handle_t *pamh,
611 void *data,
612 int error_status)
613 {
614 int ctrl = _pam_parse(pamh, 0, 0, NULL, PAM_WINBIND_CLEANUP, NULL);
615 if (_pam_log_is_debug_state_enabled(ctrl)) {
616 __pam_log_debug(pamh, ctrl, LOG_DEBUG,
617 "[pamh: %p] CLEAN: cleaning up PAM data %p "
618 "(error_status = %d)", pamh, data,
619 error_status);
620 }
621 TALLOC_FREE(data);
622 }
623
624
625 static const struct ntstatus_errors {
626 const char *ntstatus_string;
627 const char *error_string;
628 } ntstatus_errors[] = {
629 {"NT_STATUS_OK",
630 N_("Success")},
631 {"NT_STATUS_BACKUP_CONTROLLER",
632 N_("No primary Domain Controller available")},
633 {"NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
634 N_("No domain controllers found")},
635 {"NT_STATUS_NO_LOGON_SERVERS",
636 N_("No logon servers")},
637 {"NT_STATUS_PWD_TOO_SHORT",
638 N_("Password too short")},
639 {"NT_STATUS_PWD_TOO_RECENT",
640 N_("The password of this user is too recent to change")},
641 {"NT_STATUS_PWD_HISTORY_CONFLICT",
642 N_("Password is already in password history")},
643 {"NT_STATUS_PASSWORD_EXPIRED",
644 N_("Your password has expired")},
645 {"NT_STATUS_PASSWORD_MUST_CHANGE",
646 N_("You need to change your password now")},
647 {"NT_STATUS_INVALID_WORKSTATION",
648 N_("You are not allowed to logon from this workstation")},
649 {"NT_STATUS_INVALID_LOGON_HOURS",
650 N_("You are not allowed to logon at this time")},
651 {"NT_STATUS_ACCOUNT_EXPIRED",
652 N_("Your account has expired. "
653 "Please contact your System administrator")}, /* SCNR */
654 {"NT_STATUS_ACCOUNT_DISABLED",
655 N_("Your account is disabled. "
656 "Please contact your System administrator")}, /* SCNR */
657 {"NT_STATUS_ACCOUNT_LOCKED_OUT",
658 N_("Your account has been locked. "
659 "Please contact your System administrator")}, /* SCNR */
660 {"NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
661 N_("Invalid Trust Account")},
662 {"NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
663 N_("Invalid Trust Account")},
664 {"NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
665 N_("Invalid Trust Account")},
666 {"NT_STATUS_ACCESS_DENIED",
667 N_("Access is denied")},
668 {NULL, NULL}
669 };
670
671 static const char *_get_ntstatus_error_string(const char *nt_status_string)
672 {
673 int i;
674 for (i=0; ntstatus_errors[i].ntstatus_string != NULL; i++) {
675 if (!strcasecmp(ntstatus_errors[i].ntstatus_string,
676 nt_status_string)) {
677 return _(ntstatus_errors[i].error_string);
678 }
679 }
680 return NULL;
681 }
682
683 /* --- authentication management functions --- */
684
685 /* Attempt a conversation */
686
687 static int converse(const pam_handle_t *pamh,
688 int nargs,
689 const struct pam_message **message,
690 struct pam_response **response)
691 {
692 int retval;
693 const struct pam_conv *conv;
694
695 retval = pam_get_item(pamh, PAM_CONV, (const void **) &conv);
696 if (retval == PAM_SUCCESS) {
697 retval = conv->conv(nargs,
698 discard_const_p(const struct pam_message *, message),
699 response, conv->appdata_ptr);
700 }
701
702 return retval; /* propagate error status */
703 }
704
705
706 static int _make_remark(struct pwb_context *ctx,
707 int type,
708 const char *text)
709 {
710 int retval = PAM_SUCCESS;
711
712 const struct pam_message *pmsg[1];
713 struct pam_message msg[1];
714 struct pam_response *resp;
715
716 if (ctx->flags & WINBIND_SILENT) {
717 return PAM_SUCCESS;
718 }
719
720 pmsg[0] = &msg[0];
721 msg[0].msg = discard_const_p(char, text);
722 msg[0].msg_style = type;
723
724 resp = NULL;
725 retval = converse(ctx->pamh, 1, pmsg, &resp);
726
727 if (resp) {
728 _pam_drop_reply(resp, 1);
729 }
730 return retval;
731 }
732
733 static int _make_remark_v(struct pwb_context *ctx,
734 int type,
735 const char *format,
736 va_list args) PRINTF_ATTRIBUTE(3, 0);
737
738 static int _make_remark_v(struct pwb_context *ctx,
739 int type,
740 const char *format,
741 va_list args)
742 {
743 char *var;
744 int ret;
745
746 ret = vasprintf(&var, format, args);
747 if (ret < 0) {
748 _pam_log(ctx, LOG_ERR, "memory allocation failure");
749 return ret;
750 }
751
752 ret = _make_remark(ctx, type, var);
753 SAFE_FREE(var);
754 return ret;
755 }
756
757 static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
758 static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...)
759 {
760 int ret;
761 va_list args;
762
763 va_start(args, format);
764 ret = _make_remark_v(ctx, type, format, args);
765 va_end(args);
766 return ret;
767 }
768
769 static int pam_winbind_request_log(struct pwb_context *ctx,
770 int retval,
771 const char *user,
772 const char *fn)
773 {
774 switch (retval) {
775 case PAM_AUTH_ERR:
776 /* incorrect password */
777 _pam_log(ctx, LOG_WARNING, "user '%s' denied access "
778 "(incorrect password or invalid membership)", user);
779 return retval;
780 case PAM_ACCT_EXPIRED:
781 /* account expired */
782 _pam_log(ctx, LOG_WARNING, "user '%s' account expired",
783 user);
784 return retval;
785 case PAM_AUTHTOK_EXPIRED:
786 /* password expired */
787 _pam_log(ctx, LOG_WARNING, "user '%s' password expired",
788 user);
789 return retval;
790 case PAM_NEW_AUTHTOK_REQD:
791 /* new password required */
792 _pam_log(ctx, LOG_WARNING, "user '%s' new password "
793 "required", user);
794 return retval;
795 case PAM_USER_UNKNOWN:
796 /* the user does not exist */
797 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
798 user);
799 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
800 return PAM_IGNORE;
801 }
802 return retval;
803 case PAM_AUTHTOK_ERR:
804 /* Authentication token manipulation error */
805 _pam_log(ctx, LOG_WARNING, "user `%s' authentication token change failed "
806 "(pwd complexity/history/min_age not met?)", user);
807 return retval;
808 case PAM_SUCCESS:
809 /* Otherwise, the authentication looked good */
810 if (strcmp(fn, "wbcLogonUser") == 0) {
811 _pam_log(ctx, LOG_NOTICE,
812 "user '%s' granted access", user);
813 } else {
814 _pam_log(ctx, LOG_NOTICE,
815 "user '%s' OK", user);
816 }
817 return retval;
818 default:
819 /* we don't know anything about this return value */
820 _pam_log(ctx, LOG_ERR,
821 "internal module error (retval = %s(%d), user = '%s')",
822 _pam_error_code_str(retval), retval, user);
823 return retval;
824 }
825 }
826
827 static int wbc_auth_error_to_pam_error(struct pwb_context *ctx,
828 struct wbcAuthErrorInfo *e,
829 wbcErr status,
830 const char *username,
831 const char *fn)
832 {
833 int ret = PAM_AUTH_ERR;
834
835 if (WBC_ERROR_IS_OK(status)) {
836 _pam_log_debug(ctx, LOG_DEBUG, "request %s succeeded",
837 fn);
838 ret = PAM_SUCCESS;
839 return pam_winbind_request_log(ctx, ret, username, fn);
840 }
841
842 if (e) {
843 if (e->pam_error != PAM_SUCCESS) {
844 _pam_log(ctx, LOG_ERR,
845 "request %s failed: %s, "
846 "PAM error: %s (%d), NTSTATUS: %s, "
847 "Error message was: %s",
848 fn,
849 wbcErrorString(status),
850 _pam_error_code_str(e->pam_error),
851 e->pam_error,
852 e->nt_string,
853 e->display_string);
854 ret = e->pam_error;
855 return pam_winbind_request_log(ctx, ret, username, fn);
856 }
857
858 _pam_log(ctx, LOG_ERR, "request %s failed, but PAM error 0!", fn);
859
860 ret = PAM_SERVICE_ERR;
861 return pam_winbind_request_log(ctx, ret, username, fn);
862 }
863
864 ret = wbc_error_to_pam_error(status);
865 return pam_winbind_request_log(ctx, ret, username, fn);
866 }
867
868 #if defined(HAVE_PAM_RADIO_TYPE)
869 static bool _pam_winbind_change_pwd(struct pwb_context *ctx)
870 {
871 struct pam_message msg;
872 const struct pam_message *pmsg;
873 struct pam_response *resp = NULL;
874 int ret;
875 bool retval = false;
876 pmsg = &msg;
877 msg.msg_style = PAM_RADIO_TYPE;
878 msg.msg = _("Do you want to change your password now?");
879 ret = converse(ctx->pamh, 1, &pmsg, &resp);
880 if (resp == NULL) {
881 if (ret == PAM_SUCCESS) {
882 _pam_log(ctx, LOG_CRIT, "pam_winbind: system error!\n");
883 return false;
884 }
885 }
886 if (ret != PAM_SUCCESS) {
887 return false;
888 }
889 _pam_log(ctx, LOG_CRIT, "Received [%s] reply from application.\n", resp->resp);
890
891 if ((resp->resp != NULL) && (strcasecmp(resp->resp, "yes") == 0)) {
892 retval = true;
893 }
894
895 _pam_drop_reply(resp, 1);
896 return retval;
897 }
898 #else
899 static bool _pam_winbind_change_pwd(struct pwb_context *ctx)
900 {
901 return false;
902 }
903 #endif
904
905 /**
906 * send a password expiry message if required
907 *
908 * @param ctx PAM winbind context.
909 * @param next_change expected (calculated) next expiry date.
910 * @param already_expired pointer to a boolean to indicate if the password is
911 * already expired.
912 *
913 * @return boolean Returns true if message has been sent, false if not.
914 */
915
916 static bool _pam_send_password_expiry_message(struct pwb_context *ctx,
917 time_t next_change,
918 time_t now,
919 int warn_pwd_expire,
920 bool *already_expired,
921 bool *change_pwd)
922 {
923 int days = 0;
924 struct tm tm_now, tm_next_change;
925 bool retval = false;
926 int ret;
927
928 if (already_expired) {
929 *already_expired = false;
930 }
931
932 if (change_pwd) {
933 *change_pwd = false;
934 }
935
936 if (next_change <= now) {
937 PAM_WB_REMARK_DIRECT(ctx, "NT_STATUS_PASSWORD_EXPIRED");
938 if (already_expired) {
939 *already_expired = true;
940 }
941 return true;
942 }
943
944 if ((next_change < 0) ||
945 (next_change > now + warn_pwd_expire * SECONDS_PER_DAY)) {
946 return false;
947 }
948
949 if ((localtime_r(&now, &tm_now) == NULL) ||
950 (localtime_r(&next_change, &tm_next_change) == NULL)) {
951 return false;
952 }
953
954 days = (tm_next_change.tm_yday+tm_next_change.tm_year*365) -
955 (tm_now.tm_yday+tm_now.tm_year*365);
956
957 if (days == 0) {
958 ret = _make_remark(ctx, PAM_TEXT_INFO,
959 _("Your password expires today.\n"));
960
961 /*
962 * If change_pwd and already_expired is null.
963 * We are just sending a notification message.
964 * We don't expect any response in this case.
965 */
966
967 if (!change_pwd && !already_expired) {
968 return true;
969 }
970
971 /*
972 * successfully sent the warning message.
973 * Give the user a chance to change pwd.
974 */
975 if (ret == PAM_SUCCESS) {
976 if (change_pwd) {
977 retval = _pam_winbind_change_pwd(ctx);
978 if (retval) {
979 *change_pwd = true;
980 }
981 }
982 }
983 return true;
984 }
985
986 if (days > 0 && days < warn_pwd_expire) {
987
988 ret = _make_remark_format(ctx, PAM_TEXT_INFO,
989 _("Your password will expire in %d %s.\n"),
990 days, (days > 1) ? _("days"):_("day"));
991 /*
992 * If change_pwd and already_expired is null.
993 * We are just sending a notification message.
994 * We don't expect any response in this case.
995 */
996
997 if (!change_pwd && !already_expired) {
998 return true;
999 }
1000
1001 /*
1002 * successfully sent the warning message.
1003 * Give the user a chance to change pwd.
1004 */
1005 if (ret == PAM_SUCCESS) {
1006 if (change_pwd) {
1007 retval = _pam_winbind_change_pwd(ctx);
1008 if (retval) {
1009 *change_pwd = true;
1010 }
1011 }
1012 }
1013 return true;
1014 }
1015
1016 return false;
1017 }
1018
1019 /**
1020 * Send a warning if the password expires in the near future
1021 *
1022 * @param ctx PAM winbind context.
1023 * @param response The full authentication response structure.
1024 * @param already_expired boolean, is the pwd already expired?
1025 *
1026 * @return void.
1027 */
1028
1029 static void _pam_warn_password_expiry(struct pwb_context *ctx,
1030 const struct wbcAuthUserInfo *info,
1031 int warn_pwd_expire,
1032 bool *already_expired,
1033 bool *change_pwd)
1034 {
1035 time_t now = time(NULL);
1036 time_t next_change = 0;
1037
1038 if (info == NULL) {
1039 return;
1040 }
1041
1042 if (already_expired) {
1043 *already_expired = false;
1044 }
1045
1046 if (change_pwd) {
1047 *change_pwd = false;
1048 }
1049
1050 /* accounts with WBC_ACB_PWNOEXP set never receive a warning */
1051 if (info->acct_flags & WBC_ACB_PWNOEXP) {
1052 return;
1053 }
1054
1055 /* no point in sending a warning if this is a grace logon */
1056 if (PAM_WB_GRACE_LOGON(info->user_flags)) {
1057 return;
1058 }
1059
1060 /* check if the info3 must change timestamp has been set */
1061 next_change = info->pass_must_change_time;
1062
1063 if (_pam_send_password_expiry_message(ctx, next_change, now,
1064 warn_pwd_expire,
1065 already_expired,
1066 change_pwd)) {
1067 return;
1068 }
1069
1070 /* no warning sent */
1071 }
1072
1073 #define IS_SID_STRING(name) (strncmp("S-", name, 2) == 0)
1074
1075 /**
1076 * Append a string, making sure not to overflow and to always return a
1077 * NULL-terminated string.
1078 *
1079 * @param dest Destination string buffer (must already be NULL-terminated).
1080 * @param src Source string buffer.
1081 * @param dest_buffer_size Size of dest buffer in bytes.
1082 *
1083 * @return false if dest buffer is not big enough (no bytes copied), true on
1084 * success.
1085 */
1086
1087 static bool safe_append_string(char *dest,
1088 const char *src,
1089 int dest_buffer_size)
1090 {
1091 size_t len;
1092 len = strlcat(dest, src, dest_buffer_size);
1093 return (len < dest_buffer_size);
1094 }
1095
1096 /**
1097 * Convert a names into a SID string, appending it to a buffer.
1098 *
1099 * @param ctx PAM winbind context.
1100 * @param user User in PAM request.
1101 * @param name Name to convert.
1102 * @param sid_list_buffer Where to append the string sid.
1103 * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1104 *
1105 * @return false on failure, true on success.
1106 */
1107 static bool winbind_name_to_sid_string(struct pwb_context *ctx,
1108 const char *user,
1109 const char *name,
1110 char *sid_list_buffer,
1111 int sid_list_buffer_size)
1112 {
1113 char sid_string[WBC_SID_STRING_BUFLEN];
1114
1115 /* lookup name? */
1116 if (IS_SID_STRING(name)) {
1117 strlcpy(sid_string, name, sizeof(sid_string));
1118 } else {
1119 wbcErr wbc_status;
1120 struct wbcDomainSid sid;
1121 enum wbcSidType type;
1122
1123 _pam_log_debug(ctx, LOG_DEBUG,
1124 "no sid given, looking up: %s\n", name);
1125
1126 wbc_status = wbcCtxLookupName(ctx->wbc_ctx,
1127 "",
1128 name,
1129 &sid,
1130 &type);
1131 if (!WBC_ERROR_IS_OK(wbc_status)) {
1132 _pam_log(ctx, LOG_INFO,
1133 "could not lookup name: %s\n", name);
1134 return false;
1135 }
1136
1137 wbcSidToStringBuf(&sid, sid_string, sizeof(sid_string));
1138 }
1139
1140 if (!safe_append_string(sid_list_buffer, sid_string,
1141 sid_list_buffer_size)) {
1142 return false;
1143 }
1144 return true;
1145 }
1146
1147 /**
1148 * Convert a list of names into a list of sids.
1149 *
1150 * @param ctx PAM winbind context.
1151 * @param user User in PAM request.
1152 * @param name_list List of names or string sids, separated by commas.
1153 * @param sid_list_buffer Where to put the list of string sids.
1154 * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1155 *
1156 * @return false on failure, true on success.
1157 */
1158 static bool winbind_name_list_to_sid_string_list(struct pwb_context *ctx,
1159 const char *user,
1160 const char *name_list,
1161 char *sid_list_buffer,
1162 int sid_list_buffer_size)
1163 {
1164 bool result = false;
1165 char *current_name = NULL;
1166 const char *search_location;
1167 const char *comma;
1168 int len;
1169
1170 if (sid_list_buffer_size > 0) {
1171 sid_list_buffer[0] = 0;
1172 }
1173
1174 search_location = name_list;
1175 while ((comma = strchr(search_location, ',')) != NULL) {
1176 current_name = strndup(search_location,
1177 comma - search_location);
1178 if (NULL == current_name) {
1179 goto out;
1180 }
1181
1182 if (!winbind_name_to_sid_string(ctx, user,
1183 current_name,
1184 sid_list_buffer,
1185 sid_list_buffer_size)) {
1186 /*
1187 * If one group name failed, we must not fail
1188 * the authentication totally, continue with
1189 * the following group names. If user belongs to
1190 * one of the valid groups, we must allow it
1191 * login. -- BoYang
1192 */
1193
1194 _pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
1195 "check if group %s is valid group.", current_name,
1196 current_name);
1197 _make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
1198 "to sid, please contact your administrator to see "
1199 "if group %s is valid."), current_name, current_name);
1200 SAFE_FREE(current_name);
1201 search_location = comma + 1;
1202 continue;
1203 }
1204
1205 SAFE_FREE(current_name);
1206
1207 if (!safe_append_string(sid_list_buffer, ",",
1208 sid_list_buffer_size)) {
1209 goto out;
1210 }
1211
1212 search_location = comma + 1;
1213 }
1214
1215 if (!winbind_name_to_sid_string(ctx, user, search_location,
1216 sid_list_buffer,
1217 sid_list_buffer_size)) {
1218 _pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
1219 "check if group %s is valid group.", search_location,
1220 search_location);
1221 _make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
1222 "to sid, please contact your administrator to see "
1223 "if group %s is valid."), search_location, search_location);
1224
1225 /* If no valid groups were converted we should fail outright */
1226 if (name_list != NULL && strlen(sid_list_buffer) == 0) {
1227 result = false;
1228 goto out;
1229 }
1230 /*
1231 * The lookup of the last name failed..
1232 * It results in require_member_of_sid ends with ','
1233 * It is malformatted parameter here, overwrite the last ','.
1234 */
1235 len = strlen(sid_list_buffer);
1236 if ((len != 0) && (sid_list_buffer[len - 1] == ',')) {
1237 sid_list_buffer[len - 1] = '\0';
1238 }
1239 }
1240
1241 result = true;
1242
1243 out:
1244 SAFE_FREE(current_name);
1245 return result;
1246 }
1247
1248 /**
1249 * put krb5ccname variable into environment
1250 *
1251 * @param ctx PAM winbind context.
1252 * @param krb5ccname env variable retrieved from winbindd.
1253 *
1254 * @return void.
1255 */
1256
1257 static void _pam_setup_krb5_env(struct pwb_context *ctx,
1258 struct wbcLogonUserInfo *info)
1259 {
1260 char *var = NULL;
1261 int ret;
1262 uint32_t i;
1263 const char *krb5ccname = NULL;
1264
1265 if (off(ctx->ctrl, WINBIND_KRB5_AUTH)) {
1266 return;
1267 }
1268
1269 if (!info) {
1270 return;
1271 }
1272
1273 for (i=0; i < info->num_blobs; i++) {
1274 if (strcasecmp(info->blobs[i].name, "krb5ccname") == 0) {
1275 krb5ccname = (const char *)info->blobs[i].blob.data;
1276 break;
1277 }
1278 }
1279
1280 if (!krb5ccname || (strlen(krb5ccname) == 0)) {
1281 return;
1282 }
1283
1284 _pam_log_debug(ctx, LOG_DEBUG,
1285 "request returned KRB5CCNAME: %s", krb5ccname);
1286
1287 if (asprintf(&var, "KRB5CCNAME=%s", krb5ccname) == -1) {
1288 return;
1289 }
1290
1291 ret = pam_putenv(ctx->pamh, var);
1292 if (ret != PAM_SUCCESS) {
1293 _pam_log(ctx, LOG_ERR,
1294 "failed to set KRB5CCNAME to %s: %s",
1295 var, pam_strerror(ctx->pamh, ret));
1296 }
1297 free(var);
1298 }
1299
1300 /**
1301 * Copy unix username if available (further processed in PAM).
1302 *
1303 * @param ctx PAM winbind context
1304 * @param user_ret A pointer that holds a pointer to a string
1305 * @param unix_username A username
1306 *
1307 * @return void.
1308 */
1309
1310 static void _pam_setup_unix_username(struct pwb_context *ctx,
1311 char **user_ret,
1312 struct wbcLogonUserInfo *info)
1313 {
1314 const char *unix_username = NULL;
1315 uint32_t i;
1316
1317 if (!user_ret || !info) {
1318 return;
1319 }
1320
1321 for (i=0; i < info->num_blobs; i++) {
1322 if (strcasecmp(info->blobs[i].name, "unix_username") == 0) {
1323 unix_username = (const char *)info->blobs[i].blob.data;
1324 break;
1325 }
1326 }
1327
1328 if (!unix_username || !unix_username[0]) {
1329 return;
1330 }
1331
1332 *user_ret = strdup(unix_username);
1333 }
1334
1335 /**
1336 * Set string into the PAM stack.
1337 *
1338 * @param ctx PAM winbind context.
1339 * @param data_name Key name for pam_set_data.
1340 * @param value String value.
1341 *
1342 * @return void.
1343 */
1344
1345 static void _pam_set_data_string(struct pwb_context *ctx,
1346 const char *data_name,
1347 const char *value)
1348 {
1349 int ret;
1350
1351 if (!data_name || !value || (strlen(data_name) == 0) ||
1352 (strlen(value) == 0)) {
1353 return;
1354 }
1355
1356 ret = pam_set_data(ctx->pamh, data_name, talloc_strdup(NULL, value),
1357 _pam_winbind_cleanup_func);
1358 if (ret != PAM_SUCCESS) {
1359 _pam_log_debug(ctx, LOG_DEBUG,
1360 "Could not set data %s: %s\n",
1361 data_name, pam_strerror(ctx->pamh, ret));
1362 }
1363 }
1364
1365 /**
1366 * Set info3 strings into the PAM stack.
1367 *
1368 * @param ctx PAM winbind context.
1369 * @param data_name Key name for pam_set_data.
1370 * @param value String value.
1371 *
1372 * @return void.
1373 */
1374
1375 static void _pam_set_data_info3(struct pwb_context *ctx,
1376 const struct wbcAuthUserInfo *info)
1377 {
1378 _pam_set_data_string(ctx, PAM_WINBIND_HOMEDIR,
1379 info->home_directory);
1380 _pam_set_data_string(ctx, PAM_WINBIND_LOGONSCRIPT,
1381 info->logon_script);
1382 _pam_set_data_string(ctx, PAM_WINBIND_LOGONSERVER,
1383 info->logon_server);
1384 _pam_set_data_string(ctx, PAM_WINBIND_PROFILEPATH,
1385 info->profile_path);
1386 }
1387
1388 /**
1389 * Free info3 strings in the PAM stack.
1390 *
1391 * @param pamh PAM handle
1392 *
1393 * @return void.
1394 */
1395
1396 static void _pam_free_data_info3(pam_handle_t *pamh)
1397 {
1398 pam_set_data(pamh, PAM_WINBIND_HOMEDIR, NULL, NULL);
1399 pam_set_data(pamh, PAM_WINBIND_LOGONSCRIPT, NULL, NULL);
1400 pam_set_data(pamh, PAM_WINBIND_LOGONSERVER, NULL, NULL);
1401 pam_set_data(pamh, PAM_WINBIND_PROFILEPATH, NULL, NULL);
1402 }
1403
1404 /**
1405 * Send PAM_ERROR_MSG for cached or grace logons.
1406 *
1407 * @param ctx PAM winbind context.
1408 * @param username User in PAM request.
1409 * @param info3_user_flgs Info3 flags containing logon type bits.
1410 *
1411 * @return void.
1412 */
1413
1414 static void _pam_warn_logon_type(struct pwb_context *ctx,
1415 const char *username,
1416 uint32_t info3_user_flgs)
1417 {
1418 /* inform about logon type */
1419 if (PAM_WB_GRACE_LOGON(info3_user_flgs)) {
1420
1421 _make_remark(ctx, PAM_ERROR_MSG,
1422 _("Grace login. "
1423 "Please change your password as soon you're "
1424 "online again"));
1425 _pam_log_debug(ctx, LOG_DEBUG,
1426 "User %s logged on using grace logon\n",
1427 username);
1428
1429 } else if (PAM_WB_CACHED_LOGON(info3_user_flgs)) {
1430
1431 _make_remark(ctx, PAM_ERROR_MSG,
1432 _("Domain Controller unreachable, "
1433 "using cached credentials instead. "
1434 "Network resources may be unavailable"));
1435 _pam_log_debug(ctx, LOG_DEBUG,
1436 "User %s logged on using cached credentials\n",
1437 username);
1438 }
1439 }
1440
1441 /**
1442 * Send PAM_ERROR_MSG for krb5 errors.
1443 *
1444 * @param ctx PAM winbind context.
1445 * @param username User in PAM request.
1446 * @param info3_user_flgs Info3 flags containing logon type bits.
1447 *
1448 * @return void.
1449 */
1450
1451 static void _pam_warn_krb5_failure(struct pwb_context *ctx,
1452 const char *username,
1453 uint32_t info3_user_flgs)
1454 {
1455 if (PAM_WB_KRB5_CLOCK_SKEW(info3_user_flgs)) {
1456 _make_remark(ctx, PAM_ERROR_MSG,
1457 _("Failed to establish your Kerberos Ticket cache "
1458 "due time differences\n"
1459 "with the domain controller. "
1460 "Please verify the system time.\n"));
1461 _pam_log_debug(ctx, LOG_DEBUG,
1462 "User %s: Clock skew when getting Krb5 TGT\n",
1463 username);
1464 }
1465 }
1466
1467 static bool _pam_check_remark_auth_err(struct pwb_context *ctx,
1468 const struct wbcAuthErrorInfo *e,
1469 const char *nt_status_string,
1470 int *pam_err)
1471 {
1472 const char *ntstatus = NULL;
1473 const char *error_string = NULL;
1474
1475 if (!e || !pam_err) {
1476 return false;
1477 }
1478
1479 ntstatus = e->nt_string;
1480 if (!ntstatus) {
1481 return false;
1482 }
1483
1484 if (strcasecmp(ntstatus, nt_status_string) == 0) {
1485
1486 error_string = _get_ntstatus_error_string(nt_status_string);
1487 if (error_string) {
1488 _make_remark(ctx, PAM_ERROR_MSG, error_string);
1489 *pam_err = e->pam_error;
1490 return true;
1491 }
1492
1493 if (e->display_string) {
1494 _make_remark(ctx, PAM_ERROR_MSG, _(e->display_string));
1495 *pam_err = e->pam_error;
1496 return true;
1497 }
1498
1499 _make_remark(ctx, PAM_ERROR_MSG, nt_status_string);
1500 *pam_err = e->pam_error;
1501
1502 return true;
1503 }
1504
1505 return false;
1506 };
1507
1508 /**
1509 * Compose Password Restriction String for a PAM_ERROR_MSG conversation.
1510 *
1511 * @param i The wbcUserPasswordPolicyInfo struct.
1512 *
1513 * @return string (caller needs to talloc_free).
1514 */
1515
1516 static char *_pam_compose_pwd_restriction_string(struct pwb_context *ctx,
1517 struct wbcUserPasswordPolicyInfo *i)
1518 {
1519 char *str = NULL;
1520
1521 if (!i) {
1522 goto failed;
1523 }
1524
1525 str = talloc_asprintf(ctx, _("Your password "));
1526 if (!str) {
1527 goto failed;
1528 }
1529
1530 if (i->min_length_password > 0) {
1531 str = talloc_asprintf_append(str,
1532 _("must be at least %d characters; "),
1533 i->min_length_password);
1534 if (!str) {
1535 goto failed;
1536 }
1537 }
1538
1539 if (i->password_history > 0) {
1540 str = talloc_asprintf_append(str,
1541 _("cannot repeat any of your previous %d "
1542 "passwords; "),
1543 i->password_history);
1544 if (!str) {
1545 goto failed;
1546 }
1547 }
1548
1549 if (i->password_properties & WBC_DOMAIN_PASSWORD_COMPLEX) {
1550 str = talloc_asprintf_append(str,
1551 _("must contain capitals, numerals "
1552 "or punctuation; "
1553 "and cannot contain your account "
1554 "or full name; "));
1555 if (!str) {
1556 goto failed;
1557 }
1558 }
1559
1560 str = talloc_asprintf_append(str,
1561 _("Please type a different password. "
1562 "Type a password which meets these requirements in "
1563 "both text boxes."));
1564 if (!str) {
1565 goto failed;
1566 }
1567
1568 return str;
1569
1570 failed:
1571 TALLOC_FREE(str);
1572 return NULL;
1573 }
1574
1575 static int _pam_create_homedir(struct pwb_context *ctx,
1576 const char *dirname,
1577 mode_t mode)
1578 {
1579 struct stat sbuf;
1580
1581 if (stat(dirname, &sbuf) == 0) {
1582 return PAM_SUCCESS;
1583 }
1584
1585 if (mkdir(dirname, mode) != 0) {
1586
1587 _make_remark_format(ctx, PAM_TEXT_INFO,
1588 _("Creating directory: %s failed: %s"),
1589 dirname, strerror(errno));
1590 _pam_log(ctx, LOG_ERR, "could not create dir: %s (%s)",
1591 dirname, strerror(errno));
1592 return PAM_PERM_DENIED;
1593 }
1594
1595 return PAM_SUCCESS;
1596 }
1597
1598 static int _pam_chown_homedir(struct pwb_context *ctx,
1599 const char *dirname,
1600 uid_t uid,
1601 gid_t gid)
1602 {
1603 if (chown(dirname, uid, gid) != 0) {
1604 _pam_log(ctx, LOG_ERR, "failed to chown user homedir: %s (%s)",
1605 dirname, strerror(errno));
1606 return PAM_PERM_DENIED;
1607 }
1608
1609 return PAM_SUCCESS;
1610 }
1611
1612 static int _pam_mkhomedir(struct pwb_context *ctx)
1613 {
1614 struct passwd *pwd = NULL;
1615 char *token = NULL;
1616 char *create_dir = NULL;
1617 char *user_dir = NULL;
1618 int ret;
1619 const char *username;
1620 mode_t mode = 0700;
1621 char *safe_ptr = NULL;
1622 char *p = NULL;
1623
1624 /* Get the username */
1625 ret = pam_get_user(ctx->pamh, &username, NULL);
1626 if ((ret != PAM_SUCCESS) || (!username)) {
1627 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1628 return PAM_SERVICE_ERR;
1629 }
1630
1631 pwd = getpwnam(username);
1632 if (pwd == NULL) {
1633 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1634 return PAM_USER_UNKNOWN;
1635 }
1636 _pam_log_debug(ctx, LOG_DEBUG, "homedir is: %s", pwd->pw_dir);
1637
1638 ret = _pam_create_homedir(ctx, pwd->pw_dir, 0700);
1639 if (ret == PAM_SUCCESS) {
1640 ret = _pam_chown_homedir(ctx, pwd->pw_dir,
1641 pwd->pw_uid,
1642 pwd->pw_gid);
1643 }
1644
1645 if (ret == PAM_SUCCESS) {
1646 return ret;
1647 }
1648
1649 /* maybe we need to create parent dirs */
1650 create_dir = talloc_strdup(ctx, "/");
1651 if (!create_dir) {
1652 return PAM_BUF_ERR;
1653 }
1654
1655 /* find final directory */
1656 user_dir = strrchr(pwd->pw_dir, '/');
1657 if (!user_dir) {
1658 return PAM_BUF_ERR;
1659 }
1660 user_dir++;
1661
1662 _pam_log(ctx, LOG_DEBUG, "final directory: %s", user_dir);
1663
1664 p = pwd->pw_dir;
1665
1666 while ((token = strtok_r(p, "/", &safe_ptr)) != NULL) {
1667
1668 mode = 0755;
1669
1670 p = NULL;
1671
1672 _pam_log_debug(ctx, LOG_DEBUG, "token is %s", token);
1673
1674 create_dir = talloc_asprintf_append(create_dir, "%s/", token);
1675 if (!create_dir) {
1676 return PAM_BUF_ERR;
1677 }
1678 _pam_log_debug(ctx, LOG_DEBUG, "current_dir is %s", create_dir);
1679
1680 if (strcmp(token, user_dir) == 0) {
1681 _pam_log_debug(ctx, LOG_DEBUG, "assuming last directory: %s", token);
1682 mode = 0700;
1683 }
1684
1685 ret = _pam_create_homedir(ctx, create_dir, mode);
1686 if (ret != PAM_SUCCESS) {
1687 return ret;
1688 }
1689 }
1690
1691 return _pam_chown_homedir(ctx, create_dir,
1692 pwd->pw_uid,
1693 pwd->pw_gid);
1694 }
1695
1696 /* talk to winbindd */
1697 static int winbind_auth_request(struct pwb_context *ctx,
1698 const char *user,
1699 const char *pass,
1700 const char *member,
1701 const char *cctype,
1702 const int warn_pwd_expire,
1703 struct wbcAuthErrorInfo **p_error,
1704 struct wbcLogonUserInfo **p_info,
1705 time_t *pwd_last_set,
1706 char **user_ret)
1707 {
1708 wbcErr wbc_status;
1709 struct wbcLogonUserParams logon;
1710 char membership_of[1024];
1711 uid_t user_uid = -1;
1712 uint32_t flags = WBFLAG_PAM_INFO3_TEXT;
1713 struct wbcLogonUserInfo *info = NULL;
1714 struct wbcAuthUserInfo *user_info = NULL;
1715 struct wbcAuthErrorInfo *error = NULL;
1716 int ret = PAM_AUTH_ERR;
1717 int i;
1718 const char *codes[] = {
1719 "NT_STATUS_PASSWORD_EXPIRED",
1720 "NT_STATUS_PASSWORD_MUST_CHANGE",
1721 "NT_STATUS_INVALID_WORKSTATION",
1722 "NT_STATUS_INVALID_LOGON_HOURS",
1723 "NT_STATUS_ACCOUNT_EXPIRED",
1724 "NT_STATUS_ACCOUNT_DISABLED",
1725 "NT_STATUS_ACCOUNT_LOCKED_OUT",
1726 "NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
1727 "NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
1728 "NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
1729 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1730 "NT_STATUS_NO_LOGON_SERVERS",
1731 "NT_STATUS_WRONG_PASSWORD",
1732 "NT_STATUS_ACCESS_DENIED"
1733 };
1734
1735 if (pwd_last_set) {
1736 *pwd_last_set = 0;
1737 }
1738
1739 /* Krb5 auth always has to go against the KDC of the user's realm */
1740
1741 if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1742 flags |= WBFLAG_PAM_CONTACT_TRUSTDOM;
1743 }
1744
1745 if (ctx->ctrl & (WINBIND_KRB5_AUTH|WINBIND_CACHED_LOGIN)) {
1746 struct passwd *pwd = NULL;
1747
1748 pwd = getpwnam(user);
1749 if (pwd == NULL) {
1750 return PAM_USER_UNKNOWN;
1751 }
1752 user_uid = pwd->pw_uid;
1753 }
1754
1755 if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1756
1757 _pam_log_debug(ctx, LOG_DEBUG,
1758 "enabling krb5 login flag\n");
1759
1760 flags |= WBFLAG_PAM_KRB5 |
1761 WBFLAG_PAM_FALLBACK_AFTER_KRB5;
1762 }
1763
1764 if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1765 _pam_log_debug(ctx, LOG_DEBUG,
1766 "enabling cached login flag\n");
1767 flags |= WBFLAG_PAM_CACHED_LOGIN;
1768 }
1769
1770 if (user_ret) {
1771 *user_ret = NULL;
1772 flags |= WBFLAG_PAM_UNIX_NAME;
1773 }
1774
1775 if (cctype != NULL) {
1776 _pam_log_debug(ctx, LOG_DEBUG,
1777 "enabling request for a %s krb5 ccache\n",
1778 cctype);
1779 }
1780
1781 if (member != NULL) {
1782
1783 ZERO_STRUCT(membership_of);
1784
1785 if (!winbind_name_list_to_sid_string_list(ctx, user, member,
1786 membership_of,
1787 sizeof(membership_of))) {
1788 _pam_log_debug(ctx, LOG_ERR,
1789 "failed to serialize membership of sid "
1790 "\"%s\"\n", member);
1791 return PAM_AUTH_ERR;
1792 }
1793 }
1794
1795 ZERO_STRUCT(logon);
1796
1797 logon.username = user;
1798 logon.password = pass;
1799
1800 if (cctype) {
1801 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1802 &logon.blobs,
1803 "krb5_cc_type",
1804 0,
1805 discard_const_p(uint8_t, cctype),
1806 strlen(cctype)+1);
1807 if (!WBC_ERROR_IS_OK(wbc_status)) {
1808 goto done;
1809 }
1810 }
1811
1812 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1813 &logon.blobs,
1814 "flags",
1815 0,
1816 (uint8_t *)&flags,
1817 sizeof(flags));
1818 if (!WBC_ERROR_IS_OK(wbc_status)) {
1819 goto done;
1820 }
1821
1822 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1823 &logon.blobs,
1824 "user_uid",
1825 0,
1826 (uint8_t *)&user_uid,
1827 sizeof(user_uid));
1828 if (!WBC_ERROR_IS_OK(wbc_status)) {
1829 goto done;
1830 }
1831
1832 if (member) {
1833 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1834 &logon.blobs,
1835 "membership_of",
1836 0,
1837 (uint8_t *)membership_of,
1838 sizeof(membership_of));
1839 if (!WBC_ERROR_IS_OK(wbc_status)) {
1840 goto done;
1841 }
1842 }
1843
1844 wbc_status = wbcCtxLogonUser(ctx->wbc_ctx,
1845 &logon,
1846 &info,
1847 &error,
1848 NULL);
1849 ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1850 user, "wbcLogonUser");
1851 wbcFreeMemory(logon.blobs);
1852 logon.blobs = NULL;
1853
1854 if (info && info->info) {
1855 user_info = info->info;
1856 }
1857
1858 if (pwd_last_set && user_info) {
1859 *pwd_last_set = user_info->pass_last_set_time;
1860 }
1861
1862 if (p_info && info) {
1863 *p_info = info;
1864 }
1865
1866 if (p_error && error) {
1867 /* We want to process the error in the caller. */
1868 *p_error = error;
1869 return ret;
1870 }
1871
1872 for (i=0; i<ARRAY_SIZE(codes); i++) {
1873 int _ret = ret;
1874 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1875 ret = _ret;
1876 goto done;
1877 }
1878 }
1879
1880 if ((ret == PAM_SUCCESS) && user_info && info) {
1881
1882 bool already_expired = false;
1883 bool change_pwd = false;
1884
1885 /* warn a user if the password is about to expire soon */
1886 _pam_warn_password_expiry(ctx, user_info,
1887 warn_pwd_expire,
1888 &already_expired,
1889 &change_pwd);
1890
1891 if (already_expired == true) {
1892
1893 SMB_TIME_T last_set = user_info->pass_last_set_time;
1894 SMB_TIME_T must_set = user_info->pass_must_change_time;
1895
1896 _pam_log_debug(ctx, LOG_DEBUG,
1897 "Password has expired "
1898 "(Password was last set: %lld, "
1899 "it must be changed here "
1900 "%lld (now it's: %ld))\n",
1901 (long long int)last_set,
1902 (long long int)must_set,
1903 (long)time(NULL));
1904
1905 return PAM_AUTHTOK_EXPIRED;
1906 }
1907
1908 if (change_pwd) {
1909 ret = PAM_NEW_AUTHTOK_REQD;
1910 goto done;
1911 }
1912
1913 /* inform about logon type */
1914 _pam_warn_logon_type(ctx, user, user_info->user_flags);
1915
1916 /* inform about krb5 failures */
1917 _pam_warn_krb5_failure(ctx, user, user_info->user_flags);
1918
1919 /* set some info3 info for other modules in the stack */
1920 _pam_set_data_info3(ctx, user_info);
1921
1922 /* put krb5ccname into env */
1923 _pam_setup_krb5_env(ctx, info);
1924
1925 /* If winbindd returned a username, return the pointer to it
1926 * here. */
1927 _pam_setup_unix_username(ctx, user_ret, info);
1928 }
1929
1930 done:
1931 wbcFreeMemory(logon.blobs);
1932 if (info && info->blobs && !p_info) {
1933 wbcFreeMemory(info->blobs);
1934 }
1935 if (error && !p_error) {
1936 wbcFreeMemory(error);
1937 }
1938 if (info && !p_info) {
1939 wbcFreeMemory(info);
1940 }
1941
1942 return ret;
1943 }
1944
1945 /* talk to winbindd */
1946 static int winbind_chauthtok_request(struct pwb_context *ctx,
1947 const char *user,
1948 const char *oldpass,
1949 const char *newpass,
1950 time_t pwd_last_set)
1951 {
1952 wbcErr wbc_status;
1953 struct wbcChangePasswordParams params;
1954 struct wbcAuthErrorInfo *error = NULL;
1955 struct wbcUserPasswordPolicyInfo *policy = NULL;
1956 enum wbcPasswordChangeRejectReason reject_reason = -1;
1957 uint32_t flags = 0;
1958
1959 int i;
1960 const char *codes[] = {
1961 "NT_STATUS_BACKUP_CONTROLLER",
1962 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1963 "NT_STATUS_NO_LOGON_SERVERS",
1964 "NT_STATUS_ACCESS_DENIED",
1965 "NT_STATUS_PWD_TOO_SHORT", /* TODO: tell the min pwd length ? */
1966 "NT_STATUS_PWD_TOO_RECENT", /* TODO: tell the minage ? */
1967 "NT_STATUS_PWD_HISTORY_CONFLICT" /* TODO: tell the history length ? */
1968 };
1969 int ret = PAM_AUTH_ERR;
1970
1971 ZERO_STRUCT(params);
1972
1973 if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1974 flags |= WBFLAG_PAM_KRB5 |
1975 WBFLAG_PAM_CONTACT_TRUSTDOM;
1976 }
1977
1978 if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1979 flags |= WBFLAG_PAM_CACHED_LOGIN;
1980 }
1981
1982 params.account_name = user;
1983 params.level = WBC_CHANGE_PASSWORD_LEVEL_PLAIN;
1984 params.old_password.plaintext = oldpass;
1985 params.new_password.plaintext = newpass;
1986 params.flags = flags;
1987
1988 wbc_status = wbcCtxChangeUserPasswordEx(ctx->wbc_ctx,
1989 &params,
1990 &error,
1991 &reject_reason,
1992 &policy);
1993 ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1994 user, "wbcChangeUserPasswordEx");
1995
1996 if (WBC_ERROR_IS_OK(wbc_status)) {
1997 _pam_log(ctx, LOG_NOTICE,
1998 "user '%s' password changed", user);
1999 return PAM_SUCCESS;
2000 }
2001
2002 if (!error) {
2003 wbcFreeMemory(policy);
2004 return ret;
2005 }
2006
2007 for (i=0; i<ARRAY_SIZE(codes); i++) {
2008 int _ret = ret;
2009 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
2010 ret = _ret;
2011 goto done;
2012 }
2013 }
2014
2015 if (!strcasecmp(error->nt_string,
2016 "NT_STATUS_PASSWORD_RESTRICTION")) {
2017
2018 char *pwd_restriction_string = NULL;
2019 SMB_TIME_T min_pwd_age = 0;
2020
2021 if (policy) {
2022 min_pwd_age = policy->min_passwordage;
2023 }
2024
2025 /* FIXME: avoid to send multiple PAM messages after another */
2026 switch ((int)reject_reason) {
2027 case -1:
2028 break;
2029 case WBC_PWD_CHANGE_NO_ERROR:
2030 if ((min_pwd_age > 0) &&
2031 (pwd_last_set + min_pwd_age > time(NULL))) {
2032 PAM_WB_REMARK_DIRECT(ctx,
2033 "NT_STATUS_PWD_TOO_RECENT");
2034 }
2035 break;
2036 case WBC_PWD_CHANGE_PASSWORD_TOO_SHORT:
2037 PAM_WB_REMARK_DIRECT(ctx,
2038 "NT_STATUS_PWD_TOO_SHORT");
2039 break;
2040 case WBC_PWD_CHANGE_PWD_IN_HISTORY:
2041 PAM_WB_REMARK_DIRECT(ctx,
2042 "NT_STATUS_PWD_HISTORY_CONFLICT");
2043 break;
2044 case WBC_PWD_CHANGE_NOT_COMPLEX:
2045 _make_remark(ctx, PAM_ERROR_MSG,
2046 _("Password does not meet "
2047 "complexity requirements"));
2048 break;
2049 default:
2050 _pam_log_debug(ctx, LOG_DEBUG,
2051 "unknown password change "
2052 "reject reason: %d",
2053 reject_reason);
2054 break;
2055 }
2056
2057 pwd_restriction_string =
2058 _pam_compose_pwd_restriction_string(ctx, policy);
2059 if (pwd_restriction_string) {
2060 _make_remark(ctx, PAM_ERROR_MSG,
2061 pwd_restriction_string);
2062 TALLOC_FREE(pwd_restriction_string);
2063 }
2064 }
2065 done:
2066 wbcFreeMemory(error);
2067 wbcFreeMemory(policy);
2068
2069 return ret;
2070 }
2071
2072 /*
2073 * Checks if a user has an account
2074 *
2075 * return values:
2076 * 1 = User not found
2077 * 0 = OK
2078 * -1 = System error
2079 */
2080 static int valid_user(struct pwb_context *ctx,
2081 const char *user)
2082 {
2083 /* check not only if the user is available over NSS calls, also make
2084 * sure it's really a winbind user, this is important when stacking PAM
2085 * modules in the 'account' or 'password' facility. */
2086
2087 wbcErr wbc_status;
2088 struct passwd *pwd = NULL;
2089 struct passwd *wb_pwd = NULL;
2090
2091 pwd = getpwnam(user);
2092 if (pwd == NULL) {
2093 return 1;
2094 }
2095
2096 wbc_status = wbcCtxGetpwnam(ctx->wbc_ctx, user, &wb_pwd);
2097 wbcFreeMemory(wb_pwd);
2098 if (!WBC_ERROR_IS_OK(wbc_status)) {
2099 _pam_log(ctx, LOG_DEBUG, "valid_user: wbcGetpwnam gave %s\n",
2100 wbcErrorString(wbc_status));
2101 }
2102
2103 switch (wbc_status) {
2104 case WBC_ERR_UNKNOWN_USER:
2105 /* match other insane libwbclient return codes */
2106 case WBC_ERR_WINBIND_NOT_AVAILABLE:
2107 case WBC_ERR_DOMAIN_NOT_FOUND:
2108 return 1;
2109 case WBC_ERR_SUCCESS:
2110 return 0;
2111 default:
2112 break;
2113 }
2114 return -1;
2115 }
2116
2117 static char *_pam_delete(register char *xx)
2118 {
2119 _pam_overwrite(xx);
2120 _pam_drop(xx);
2121 return NULL;
2122 }
2123
2124 /*
2125 * obtain a password from the user
2126 */
2127
2128 static int _winbind_read_password(struct pwb_context *ctx,
2129 unsigned int ctrl,
2130 const char *comment,
2131 const char *prompt1,
2132 const char *prompt2,
2133 const char **pass)
2134 {
2135 int authtok_flag;
2136 int retval;
2137 const char *item;
2138 char *token;
2139
2140 _pam_log(ctx, LOG_DEBUG, "getting password (0x%08x)", ctrl);
2141
2142 /*
2143 * make sure nothing inappropriate gets returned
2144 */
2145
2146 *pass = token = NULL;
2147
2148 /*
2149 * which authentication token are we getting?
2150 */
2151
2152 if (on(WINBIND__OLD_PASSWORD, ctrl)) {
2153 authtok_flag = PAM_OLDAUTHTOK;
2154 } else {
2155 authtok_flag = PAM_AUTHTOK;
2156 }
2157
2158 /*
2159 * should we obtain the password from a PAM item ?
2160 */
2161
2162 if (on(WINBIND_TRY_FIRST_PASS_ARG, ctrl) ||
2163 on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2164 retval = pam_get_item(ctx->pamh,
2165 authtok_flag,
2166 (const void **) &item);
2167 if (retval != PAM_SUCCESS) {
2168 /* very strange. */
2169 _pam_log(ctx, LOG_ALERT,
2170 "pam_get_item returned error "
2171 "to unix-read-password");
2172 return retval;
2173 } else if (item != NULL) { /* we have a password! */
2174 *pass = item;
2175 item = NULL;
2176 _pam_log(ctx, LOG_DEBUG,
2177 "pam_get_item returned a password");
2178 return PAM_SUCCESS;
2179 } else if (on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2180 return PAM_AUTHTOK_RECOVER_ERR; /* didn't work */
2181 } else if (on(WINBIND_USE_AUTHTOK_ARG, ctrl)
2182 && off(WINBIND__OLD_PASSWORD, ctrl)) {
2183 return PAM_AUTHTOK_RECOVER_ERR;
2184 }
2185 }
2186 /*
2187 * getting here implies we will have to get the password from the
2188 * user directly.
2189 */
2190
2191 {
2192 struct pam_message msg[3];
2193 const struct pam_message *pmsg[3];
2194 struct pam_response *resp;
2195 int i, replies;
2196
2197 /* prepare to converse */
2198
2199 if (comment != NULL && off(ctrl, WINBIND_SILENT)) {
2200 pmsg[0] = &msg[0];
2201 msg[0].msg_style = PAM_TEXT_INFO;
2202 msg[0].msg = discard_const_p(char, comment);
2203 i = 1;
2204 } else {
2205 i = 0;
2206 }
2207
2208 pmsg[i] = &msg[i];
2209 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2210 msg[i++].msg = discard_const_p(char, prompt1);
2211 replies = 1;
2212
2213 if (prompt2 != NULL) {
2214 pmsg[i] = &msg[i];
2215 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2216 msg[i++].msg = discard_const_p(char, prompt2);
2217 ++replies;
2218 }
2219 /* so call the conversation expecting i responses */
2220 resp = NULL;
2221 retval = converse(ctx->pamh, i, pmsg, &resp);
2222 if (resp == NULL) {
2223 if (retval == PAM_SUCCESS) {
2224 retval = PAM_AUTHTOK_RECOVER_ERR;
2225 }
2226 goto done;
2227 }
2228 if (retval != PAM_SUCCESS) {
2229 _pam_drop_reply(resp, i);
2230 goto done;
2231 }
2232
2233 /* interpret the response */
2234
2235 token = x_strdup(resp[i - replies].resp);
2236 if (!token) {
2237 _pam_log(ctx, LOG_NOTICE,
2238 "could not recover "
2239 "authentication token");
2240 retval = PAM_AUTHTOK_RECOVER_ERR;
2241 goto done;
2242 }
2243
2244 if (replies == 2) {
2245 /* verify that password entered correctly */
2246 if (!resp[i - 1].resp ||
2247 strcmp(token, resp[i - 1].resp)) {
2248 _pam_delete(token); /* mistyped */
2249 retval = PAM_AUTHTOK_RECOVER_ERR;
2250 _make_remark(ctx, PAM_ERROR_MSG,
2251 MISTYPED_PASS);
2252 }
2253 }
2254
2255 /*
2256 * tidy up the conversation (resp_retcode) is ignored
2257 * -- what is it for anyway? AGM
2258 */
2259 _pam_drop_reply(resp, i);
2260 }
2261
2262 done:
2263 if (retval != PAM_SUCCESS) {
2264 _pam_log_debug(ctx, LOG_DEBUG,
2265 "unable to obtain a password");
2266 return retval;
2267 }
2268 /* 'token' is the entered password */
2269
2270 /* we store this password as an item */
2271
2272 retval = pam_set_item(ctx->pamh, authtok_flag, token);
2273 _pam_delete(token); /* clean it up */
2274 if (retval != PAM_SUCCESS ||
2275 (retval = pam_get_item(ctx->pamh, authtok_flag, (const void **) &item)) != PAM_SUCCESS) {
2276
2277 _pam_log(ctx, LOG_CRIT, "error manipulating password");
2278 return retval;
2279
2280 }
2281
2282 *pass = item;
2283 item = NULL; /* break link to password */
2284
2285 return PAM_SUCCESS;
2286 }
2287
2288 static const char *get_conf_item_string(struct pwb_context *ctx,
2289 const char *item,
2290 int config_flag)
2291 {
2292 int i = 0;
2293 const char *parm_opt = NULL;
2294
2295 if (!(ctx->ctrl & config_flag)) {
2296 goto out;
2297 }
2298
2299 /* let the pam opt take precedence over the pam_winbind.conf option */
2300 for (i=0; i<ctx->argc; i++) {
2301
2302 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2303 char *p;
2304
2305 if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2306 _pam_log(ctx, LOG_INFO,
2307 "no \"=\" delimiter for \"%s\" found\n",
2308 item);
2309 goto out;
2310 }
2311 _pam_log_debug(ctx, LOG_INFO,
2312 "PAM config: %s '%s'\n", item, p+1);
2313 return p + 1;
2314 }
2315 }
2316
2317 if (ctx->dict) {
2318 char *key = NULL;
2319
2320 key = talloc_asprintf(ctx, "global:%s", item);
2321 if (!key) {
2322 goto out;
2323 }
2324
2325 parm_opt = tiniparser_getstring_nonempty(ctx->dict, key, NULL);
2326 TALLOC_FREE(key);
2327
2328 _pam_log_debug(ctx, LOG_INFO, "CONFIG file: %s '%s'\n",
2329 item, parm_opt);
2330 }
2331 out:
2332 return parm_opt;
2333 }
2334
2335 static int get_config_item_int(struct pwb_context *ctx,
2336 const char *item,
2337 int config_flag)
2338 {
2339 int i, parm_opt = -1;
2340
2341 if (!(ctx->ctrl & config_flag)) {
2342 goto out;
2343 }
2344
2345 /* let the pam opt take precedence over the pam_winbind.conf option */
2346 for (i = 0; i < ctx->argc; i++) {
2347
2348 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2349 char *p;
2350
2351 if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2352 _pam_log(ctx, LOG_INFO,
2353 "no \"=\" delimiter for \"%s\" found\n",
2354 item);
2355 goto out;
2356 }
2357 parm_opt = atoi(p + 1);
2358 _pam_log_debug(ctx, LOG_INFO,
2359 "PAM config: %s '%d'\n",
2360 item, parm_opt);
2361 return parm_opt;
2362 }
2363 }
2364
2365 if (ctx->dict) {
2366 char *key = NULL;
2367
2368 key = talloc_asprintf(ctx, "global:%s", item);
2369 if (!key) {
2370 goto out;
2371 }
2372
2373 parm_opt = tiniparser_getint(ctx->dict, key, -1);
2374 TALLOC_FREE(key);
2375
2376 _pam_log_debug(ctx, LOG_INFO,
2377 "CONFIG file: %s '%d'\n",
2378 item, parm_opt);
2379 }
2380 out:
2381 return parm_opt;
2382 }
2383
2384 static const char *get_krb5_cc_type_from_config(struct pwb_context *ctx)
2385 {
2386 return get_conf_item_string(ctx, "krb5_ccache_type",
2387 WINBIND_KRB5_CCACHE_TYPE);
2388 }
2389
2390 static const char *get_member_from_config(struct pwb_context *ctx)
2391 {
2392 const char *ret = NULL;
2393 ret = get_conf_item_string(ctx, "require_membership_of",
2394 WINBIND_REQUIRED_MEMBERSHIP);
2395 if (ret != NULL) {
2396 return ret;
2397 }
2398 return get_conf_item_string(ctx, "require-membership-of",
2399 WINBIND_REQUIRED_MEMBERSHIP);
2400 }
2401
2402 static int get_warn_pwd_expire_from_config(struct pwb_context *ctx)
2403 {
2404 int ret;
2405 ret = get_config_item_int(ctx, "warn_pwd_expire",
2406 WINBIND_WARN_PWD_EXPIRE);
2407 /* no or broken setting */
2408 if (ret < 0) {
2409 return DEFAULT_DAYS_TO_WARN_BEFORE_PWD_EXPIRES;
2410 }
2411 return ret;
2412 }
2413
2414 /**
2415 * Retrieve the winbind separator.
2416 *
2417 * @param ctx PAM winbind context.
2418 *
2419 * @return string separator character. NULL on failure.
2420 */
2421
2422 static char winbind_get_separator(struct pwb_context *ctx)
2423 {
2424 wbcErr wbc_status;
2425 static struct wbcInterfaceDetails *details = NULL;
2426
2427 wbc_status = wbcCtxInterfaceDetails(ctx->wbc_ctx, &details);
2428 if (!WBC_ERROR_IS_OK(wbc_status)) {
2429 _pam_log(ctx, LOG_ERR,
2430 "Could not retrieve winbind interface details: %s",
2431 wbcErrorString(wbc_status));
2432 return '\0';
2433 }
2434
2435 if (!details) {
2436 return '\0';
2437 }
2438
2439 return details->winbind_separator;
2440 }
2441
2442
2443 /**
2444 * Convert a upn to a name.
2445 *
2446 * @param ctx PAM winbind context.
2447 * @param upn User UPN to be translated.
2448 *
2449 * @return converted name. NULL pointer on failure. Caller needs to free.
2450 */
2451
2452 static char* winbind_upn_to_username(struct pwb_context *ctx,
2453 const char *upn)
2454 {
2455 char sep;
2456 wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;
2457 struct wbcDomainSid sid;
2458 enum wbcSidType type;
2459 char *domain = NULL;
2460 char *name;
2461 char *p;
2462 char *result;
2463
2464 /* This cannot work when the winbind separator = @ */
2465
2466 sep = winbind_get_separator(ctx);
2467 if (!sep || sep == '@') {
2468 return NULL;
2469 }
2470
2471 name = talloc_strdup(ctx, upn);
2472 if (!name) {
2473 return NULL;
2474 }
2475
2476 p = strchr(name, '@');
2477 if (p == NULL) {
2478 TALLOC_FREE(name);
2479 return NULL;
2480 }
2481 *p = '\0';
2482 domain = p + 1;
2483
2484 /* Convert the UPN to a SID */
2485
2486 wbc_status = wbcCtxLookupName(ctx->wbc_ctx, domain, name, &sid, &type);
2487 if (!WBC_ERROR_IS_OK(wbc_status)) {
2488 return NULL;
2489 }
2490
2491 /* Convert the the SID back to the sAMAccountName */
2492
2493 wbc_status = wbcCtxLookupSid(ctx->wbc_ctx, &sid, &domain, &name, &type);
2494 if (!WBC_ERROR_IS_OK(wbc_status)) {
2495 return NULL;
2496 }
2497
2498 result = talloc_asprintf(ctx, "%s%c%s", domain, sep, name);
2499 wbcFreeMemory(domain);
2500 wbcFreeMemory(name);
2501 return result;
2502 }
2503
2504 static int _pam_delete_cred(pam_handle_t *pamh, int flags,
2505 int argc, enum pam_winbind_request_type type,
2506 const char **argv)
2507 {
2508 int retval = PAM_SUCCESS;
2509 struct pwb_context *ctx = NULL;
2510 struct wbcLogoffUserParams logoff;
2511 struct wbcAuthErrorInfo *error = NULL;
2512 const char *user;
2513 wbcErr wbc_status = WBC_ERR_SUCCESS;
2514
2515 ZERO_STRUCT(logoff);
2516
2517 retval = _pam_winbind_init_context(pamh, flags, argc, argv, type, &ctx);
2518 if (retval != PAM_SUCCESS) {
2519 return retval;
2520 }
2521
2522 _PAM_LOG_FUNCTION_ENTER("_pam_delete_cred", ctx);
2523
2524 if (ctx->ctrl & WINBIND_KRB5_AUTH) {
2525
2526 /* destroy the ccache here */
2527
2528 uint32_t wbc_flags = 0;
2529 const char *ccname = NULL;
2530 struct passwd *pwd = NULL;
2531
2532 retval = pam_get_user(pamh, &user, _("Username: "));
2533 if (retval != PAM_SUCCESS) {
2534 _pam_log(ctx, LOG_ERR,
2535 "could not identify user");
2536 goto out;
2537 }
2538
2539 if (user == NULL) {
2540 _pam_log(ctx, LOG_ERR,
2541 "username was NULL!");
2542 retval = PAM_USER_UNKNOWN;
2543 goto out;
2544 }
2545
2546 _pam_log_debug(ctx, LOG_DEBUG,
2547 "username [%s] obtained", user);
2548
2549 ccname = pam_getenv(pamh, "KRB5CCNAME");
2550 if (ccname == NULL) {
2551 _pam_log_debug(ctx, LOG_DEBUG,
2552 "user has no KRB5CCNAME environment");
2553 }
2554
2555 pwd = getpwnam(user);
2556 if (pwd == NULL) {
2557 retval = PAM_USER_UNKNOWN;
2558 goto out;
2559 }
2560
2561 wbc_flags = WBFLAG_PAM_KRB5 |
2562 WBFLAG_PAM_CONTACT_TRUSTDOM;
2563
2564 logoff.username = user;
2565
2566 if (ccname) {
2567 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2568 &logoff.blobs,
2569 "ccfilename",
2570 0,
2571 discard_const_p(uint8_t, ccname),
2572 strlen(ccname)+1);
2573 if (!WBC_ERROR_IS_OK(wbc_status)) {
2574 goto out;
2575 }
2576 }
2577
2578 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2579 &logoff.blobs,
2580 "flags",
2581 0,
2582 (uint8_t *)&wbc_flags,
2583 sizeof(wbc_flags));
2584 if (!WBC_ERROR_IS_OK(wbc_status)) {
2585 goto out;
2586 }
2587
2588 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2589 &logoff.blobs,
2590 "user_uid",
2591 0,
2592 (uint8_t *)&pwd->pw_uid,
2593 sizeof(pwd->pw_uid));
2594 if (!WBC_ERROR_IS_OK(wbc_status)) {
2595 goto out;
2596 }
2597
2598 wbc_status = wbcCtxLogoffUserEx(ctx->wbc_ctx, &logoff, &error);
2599 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2600 user, "wbcLogoffUser");
2601 wbcFreeMemory(error);
2602 wbcFreeMemory(logoff.blobs);
2603 logoff.blobs = NULL;
2604
2605 if (!WBC_ERROR_IS_OK(wbc_status)) {
2606 _pam_log(ctx, LOG_INFO,
2607 "failed to logoff user %s: %s\n",
2608 user, wbcErrorString(wbc_status));
2609 }
2610 }
2611
2612 out:
2613 if (logoff.blobs) {
2614 wbcFreeMemory(logoff.blobs);
2615 }
2616
2617 if (!WBC_ERROR_IS_OK(wbc_status)) {
2618 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2619 user, "wbcLogoffUser");
2620 }
2621
2622 /*
2623 * Delete the krb5 ccname variable from the PAM environment
2624 * if it was set by winbind.
2625 */
2626 if ((ctx->ctrl & WINBIND_KRB5_AUTH) && pam_getenv(pamh, "KRB5CCNAME")) {
2627 pam_putenv(pamh, "KRB5CCNAME");
2628 }
2629
2630 _PAM_LOG_FUNCTION_LEAVE("_pam_delete_cred", ctx, retval);
2631
2632 TALLOC_FREE(ctx);
2633
2634 return retval;
2635 }
2636
2637 PAM_EXTERN
2638 int pam_sm_authenticate(pam_handle_t *pamh, int flags,
2639 int argc, const char **argv)
2640 {
2641 const char *username;
2642 const char *password;
2643 const char *member = NULL;
2644 const char *cctype = NULL;
2645 int warn_pwd_expire;
2646 int retval = PAM_AUTH_ERR;
2647 char *username_ret = NULL;
2648 char *new_authtok_required = NULL;
2649 char *real_username = NULL;
2650 struct pwb_context *ctx = NULL;
2651
2652 retval = _pam_winbind_init_context(pamh, flags, argc, argv,
2653 PAM_WINBIND_AUTHENTICATE, &ctx);
2654 if (retval != PAM_SUCCESS) {
2655 return retval;
2656 }
2657
2658 _PAM_LOG_FUNCTION_ENTER("pam_sm_authenticate", ctx);
2659
2660 /* Get the username */
2661 retval = pam_get_user(pamh, &username, NULL);
2662 if ((retval != PAM_SUCCESS) || (!username)) {
2663 _pam_log_debug(ctx, LOG_DEBUG,
2664 "can not get the username");
2665 retval = PAM_SERVICE_ERR;
2666 goto out;
2667 }
2668
2669
2670 #if defined(AIX)
2671 /* Decode the user name since AIX does not support logn user
2672 names by default. The name is encoded as _#uid. */
2673
2674 if (username[0] == '_') {
2675 uid_t id = atoi(&username[1]);
2676 struct passwd *pw = NULL;
2677
2678 if ((id!=0) && ((pw = getpwuid(id)) != NULL)) {
2679 real_username = strdup(pw->pw_name);
2680 }
2681 }
2682 #endif
2683
2684 if (!real_username) {
2685 /* Just making a copy of the username we got from PAM */
2686 if ((real_username = strdup(username)) == NULL) {
2687 _pam_log_debug(ctx, LOG_DEBUG,
2688 "memory allocation failure when copying "
2689 "username");
2690 retval = PAM_SERVICE_ERR;
2691 goto out;
2692 }
2693 }
2694
2695 /* Maybe this was a UPN */
2696
2697 if (strchr(real_username, '@') != NULL) {
2698 char *samaccountname = NULL;
2699
2700 samaccountname = winbind_upn_to_username(ctx,
2701 real_username);
2702 if (samaccountname) {
2703 free(real_username);
2704 real_username = strdup(samaccountname);
2705 }
2706 }
2707
2708 retval = _winbind_read_password(ctx, ctx->ctrl, NULL,
2709 _("Password: "), NULL,
2710 &password);
2711
2712 if (retval != PAM_SUCCESS) {
2713 _pam_log(ctx, LOG_ERR,
2714 "Could not retrieve user's password");
2715 retval = PAM_AUTHTOK_ERR;
2716 goto out;
2717 }
2718
2719 /* Let's not give too much away in the log file */
2720
2721 #ifdef DEBUG_PASSWORD
2722 _pam_log_debug(ctx, LOG_INFO,
2723 "Verify user '%s' with password '%s'",
2724 real_username, password);
2725 #else
2726 _pam_log_debug(ctx, LOG_INFO,
2727 "Verify user '%s'", real_username);
2728 #endif
2729
2730 member = get_member_from_config(ctx);
2731 cctype = get_krb5_cc_type_from_config(ctx);
2732 warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
2733
2734 /* Now use the username to look up password */
2735 retval = winbind_auth_request(ctx, real_username, password,
2736 member, cctype, warn_pwd_expire,
2737 NULL, NULL, NULL, &username_ret);
2738
2739 if (retval == PAM_NEW_AUTHTOK_REQD ||
2740 retval == PAM_AUTHTOK_EXPIRED) {
2741
2742 char *new_authtok_required_during_auth = NULL;
2743
2744 new_authtok_required = talloc_asprintf(NULL, "%d", retval);
2745 if (!new_authtok_required) {
2746 retval = PAM_BUF_ERR;
2747 goto out;
2748 }
2749
2750 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2751 new_authtok_required,
2752 _pam_winbind_cleanup_func);
2753
2754 retval = PAM_SUCCESS;
2755
2756 new_authtok_required_during_auth = talloc_asprintf(NULL, "%d", true);
2757 if (!new_authtok_required_during_auth) {
2758 retval = PAM_BUF_ERR;
2759 goto out;
2760 }
2761
2762 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2763 new_authtok_required_during_auth,
2764 _pam_winbind_cleanup_func);
2765
2766 goto out;
2767 }
2768
2769 out:
2770 if (username_ret) {
2771 pam_set_item (pamh, PAM_USER, username_ret);
2772 _pam_log_debug(ctx, LOG_INFO,
2773 "Returned user was '%s'", username_ret);
2774 free(username_ret);
2775 }
2776
2777 if (real_username) {
2778 free(real_username);
2779 }
2780
2781 if (!new_authtok_required) {
2782 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, NULL, NULL);
2783 }
2784
2785 if (retval != PAM_SUCCESS) {
2786 _pam_free_data_info3(pamh);
2787 }
2788
2789 _PAM_LOG_FUNCTION_LEAVE("pam_sm_authenticate", ctx, retval);
2790
2791 TALLOC_FREE(ctx);
2792
2793 return retval;
2794 }
2795
2796 PAM_EXTERN
2797 int pam_sm_setcred(pam_handle_t *pamh, int flags,
2798 int argc, const char **argv)
2799 {
2800 int ret = PAM_SYSTEM_ERR;
2801 struct pwb_context *ctx = NULL;
2802
2803 ret = _pam_winbind_init_context(pamh, flags, argc, argv,
2804 PAM_WINBIND_SETCRED, &ctx);
2805 if (ret != PAM_SUCCESS) {
2806 return ret;
2807 }
2808
2809 _PAM_LOG_FUNCTION_ENTER("pam_sm_setcred", ctx);
2810
2811 switch (flags & ~PAM_SILENT) {
2812
2813 case PAM_DELETE_CRED:
2814 ret = _pam_delete_cred(pamh, flags, argc,
2815 PAM_WINBIND_SETCRED, argv);
2816 break;
2817 case PAM_REFRESH_CRED:
2818 _pam_log_debug(ctx, LOG_WARNING,
2819 "PAM_REFRESH_CRED not implemented");
2820 ret = PAM_SUCCESS;
2821 break;
2822 case PAM_REINITIALIZE_CRED:
2823 _pam_log_debug(ctx, LOG_WARNING,
2824 "PAM_REINITIALIZE_CRED not implemented");
2825 ret = PAM_SUCCESS;
2826 break;
2827 case PAM_ESTABLISH_CRED:
2828 _pam_log_debug(ctx, LOG_WARNING,
2829 "PAM_ESTABLISH_CRED not implemented");
2830 ret = PAM_SUCCESS;
2831 break;
2832 default:
2833 ret = PAM_SYSTEM_ERR;
2834 break;
2835 }
2836
2837 _PAM_LOG_FUNCTION_LEAVE("pam_sm_setcred", ctx, ret);
2838
2839 TALLOC_FREE(ctx);
2840
2841 return ret;
2842 }
2843
2844 /*
2845 * Account management. We want to verify that the account exists
2846 * before returning PAM_SUCCESS
2847 */
2848 PAM_EXTERN
2849 int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
2850 int argc, const char **argv)
2851 {
2852 const char *username;
2853 int ret = PAM_USER_UNKNOWN;
2854 const char *tmp = NULL;
2855 struct pwb_context *ctx = NULL;
2856
2857 ret = _pam_winbind_init_context(pamh, flags, argc, argv,
2858 PAM_WINBIND_ACCT_MGMT, &ctx);
2859 if (ret != PAM_SUCCESS) {
2860 return ret;
2861 }
2862
2863 _PAM_LOG_FUNCTION_ENTER("pam_sm_acct_mgmt", ctx);
2864
2865
2866 /* Get the username */
2867 ret = pam_get_user(pamh, &username, NULL);
2868 if ((ret != PAM_SUCCESS) || (!username)) {
2869 _pam_log_debug(ctx, LOG_DEBUG,
2870 "can not get the username");
2871 ret = PAM_SERVICE_ERR;
2872 goto out;
2873 }
2874
2875 /* Verify the username */
2876 ret = valid_user(ctx, username);
2877 switch (ret) {
2878 case -1:
2879 /* some sort of system error. The log was already printed */
2880 ret = PAM_SERVICE_ERR;
2881 goto out;
2882 case 1:
2883 /* the user does not exist */
2884 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
2885 username);
2886 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
2887 ret = PAM_IGNORE;
2888 goto out;
2889 }
2890 ret = PAM_USER_UNKNOWN;
2891 goto out;
2892 case 0:
2893 pam_get_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2894 (const void **)&tmp);
2895 if (tmp != NULL) {
2896 ret = atoi(tmp);
2897 switch (ret) {
2898 case PAM_AUTHTOK_EXPIRED:
2899 /* Since new token is required in this case */
2900 FALL_THROUGH;
2901 case PAM_NEW_AUTHTOK_REQD:
2902 _pam_log(ctx, LOG_WARNING,
2903 "pam_sm_acct_mgmt success but %s is set",
2904 PAM_WINBIND_NEW_AUTHTOK_REQD);
2905 _pam_log(ctx, LOG_NOTICE,
2906 "user '%s' needs new password",
2907 username);
2908 /* PAM_AUTHTOKEN_REQD does not exist, but is documented in the manpage */
2909 ret = PAM_NEW_AUTHTOK_REQD;
2910 goto out;
2911 default:
2912 _pam_log(ctx, LOG_WARNING,
2913 "pam_sm_acct_mgmt success");
2914 _pam_log(ctx, LOG_NOTICE,
2915 "user '%s' granted access", username);
2916 ret = PAM_SUCCESS;
2917 goto out;
2918 }
2919 }
2920
2921 /* Otherwise, the authentication looked good */
2922 _pam_log(ctx, LOG_NOTICE,
2923 "user '%s' granted access", username);
2924 ret = PAM_SUCCESS;
2925 goto out;
2926 default:
2927 /* we don't know anything about this return value */
2928 _pam_log(ctx, LOG_ERR,
2929 "internal module error (ret = %d, user = '%s')",
2930 ret, username);
2931 ret = PAM_SERVICE_ERR;
2932 goto out;
2933 }
2934
2935 /* should not be reached */
2936 ret = PAM_IGNORE;
2937
2938 out:
2939
2940 _PAM_LOG_FUNCTION_LEAVE("pam_sm_acct_mgmt", ctx, ret);
2941
2942 TALLOC_FREE(ctx);
2943
2944 return ret;
2945 }
2946
2947 PAM_EXTERN
2948 int pam_sm_open_session(pam_handle_t *pamh, int flags,
2949 int argc, const char **argv)
2950 {
2951 int ret = PAM_SUCCESS;
2952 struct pwb_context *ctx = NULL;
2953
2954 ret = _pam_winbind_init_context(pamh, flags, argc, argv,
2955 PAM_WINBIND_OPEN_SESSION, &ctx);
2956 if (ret != PAM_SUCCESS) {
2957 return ret;
2958 }
2959
2960 _PAM_LOG_FUNCTION_ENTER("pam_sm_open_session", ctx);
2961
2962 if (ctx->ctrl & WINBIND_MKHOMEDIR) {
2963 /* check and create homedir */
2964 ret = _pam_mkhomedir(ctx);
2965 }
2966
2967 _PAM_LOG_FUNCTION_LEAVE("pam_sm_open_session", ctx, ret);
2968
2969 TALLOC_FREE(ctx);
2970
2971 return ret;
2972 }
2973
2974 PAM_EXTERN
2975 int pam_sm_close_session(pam_handle_t *pamh, int flags,
2976 int argc, const char **argv)
2977 {
2978 int ret = PAM_SUCCESS;
2979 struct pwb_context *ctx = NULL;
2980
2981 ret = _pam_winbind_init_context(pamh, flags, argc, argv,
2982 PAM_WINBIND_CLOSE_SESSION, &ctx);
2983 if (ret != PAM_SUCCESS) {
2984 return ret;
2985 }
2986
2987 _PAM_LOG_FUNCTION_ENTER("pam_sm_close_session", ctx);
2988
2989 _PAM_LOG_FUNCTION_LEAVE("pam_sm_close_session", ctx, ret);
2990
2991 TALLOC_FREE(ctx);
2992
2993 return ret;
2994 }
2995
2996 /**
2997 * evaluate whether we need to re-authenticate with kerberos after a
2998 * password change
2999 *
3000 * @param ctx PAM winbind context.
3001 * @param user The username
3002 *
3003 * @return boolean Returns true if required, false if not.
3004 */
3005
3006 static bool _pam_require_krb5_auth_after_chauthtok(struct pwb_context *ctx,
3007 const char *user)
3008 {
3009
3010 /* Make sure that we only do this if a) the chauthtok got initiated
3011 * during a logon attempt (authenticate->acct_mgmt->chauthtok) b) any
3012 * later password change via the "passwd" command if done by the user
3013 * itself
3014 * NB. If we login from gdm or xdm and the password expires,
3015 * we change the password, but there is no memory cache.
3016 * Thus, even for passthrough login, we should do the
3017 * authentication again to update memory cache.
3018 * --- BoYang
3019 * */
3020
3021 const char *new_authtok_reqd_during_auth = NULL;
3022 struct passwd *pwd = NULL;
3023
3024 pam_get_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
3025 (const void **) &new_authtok_reqd_during_auth);
3026 pam_set_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
3027 NULL, NULL);
3028
3029 if (new_authtok_reqd_during_auth) {
3030 return true;
3031 }
3032
3033 pwd = getpwnam(user);
3034 if (!pwd) {
3035 return false;
3036 }
3037
3038 if (getuid() == pwd->pw_uid) {
3039 return true;
3040 }
3041
3042 return false;
3043 }
3044
3045
3046 PAM_EXTERN
3047 int pam_sm_chauthtok(pam_handle_t * pamh, int flags,
3048 int argc, const char **argv)
3049 {
3050 unsigned int lctrl;
3051 int ret;
3052 bool cached_login = false;
3053
3054 /* <DO NOT free() THESE> */
3055 const char *user;
3056 const char *pass_old;
3057 const char *pass_new;
3058 /* </DO NOT free() THESE> */
3059
3060 char *Announce;
3061
3062 int retry = 0;
3063 char *username_ret = NULL;
3064 struct wbcAuthErrorInfo *error = NULL;
3065 struct pwb_context *ctx = NULL;
3066
3067 ret = _pam_winbind_init_context(pamh, flags, argc, argv,
3068 PAM_WINBIND_CHAUTHTOK, &ctx);
3069 if (ret != PAM_SUCCESS) {
3070 return ret;
3071 }
3072
3073 _PAM_LOG_FUNCTION_ENTER("pam_sm_chauthtok", ctx);
3074
3075 cached_login = (ctx->ctrl & WINBIND_CACHED_LOGIN);
3076
3077 /* clearing offline bit for auth */
3078 ctx->ctrl &= ~WINBIND_CACHED_LOGIN;
3079
3080 /*
3081 * First get the name of a user
3082 */
3083 ret = pam_get_user(pamh, &user, _("Username: "));
3084 if (ret != PAM_SUCCESS) {
3085 _pam_log(ctx, LOG_ERR,
3086 "password - could not identify user");
3087 goto out;
3088 }
3089
3090 if (user == NULL) {
3091 _pam_log(ctx, LOG_ERR, "username was NULL!");
3092 ret = PAM_USER_UNKNOWN;
3093 goto out;
3094 }
3095
3096 _pam_log_debug(ctx, LOG_DEBUG, "username [%s] obtained", user);
3097
3098 /* check if this is really a user in winbindd, not only in NSS */
3099 ret = valid_user(ctx, user);
3100 switch (ret) {
3101 case 1:
3102 ret = PAM_USER_UNKNOWN;
3103 goto out;
3104 case -1:
3105 ret = PAM_SYSTEM_ERR;
3106 goto out;
3107 default:
3108 break;
3109 }
3110
3111 /*
3112 * obtain and verify the current password (OLDAUTHTOK) for
3113 * the user.
3114 */
3115
3116 if (flags & PAM_PRELIM_CHECK) {
3117 time_t pwdlastset_prelim = 0;
3118
3119 /* instruct user what is happening */
3120
3121 #define greeting _("Changing password for")
3122 Announce = talloc_asprintf(ctx, "%s %s", greeting, user);
3123 if (!Announce) {
3124 _pam_log(ctx, LOG_CRIT,
3125 "password - out of memory");
3126 ret = PAM_BUF_ERR;
3127 goto out;
3128 }
3129 #undef greeting
3130
3131 lctrl = ctx->ctrl | WINBIND__OLD_PASSWORD;
3132 ret = _winbind_read_password(ctx, lctrl,
3133 Announce,
3134 _("(current) NT password: "),
3135 NULL,
3136 (const char **) &pass_old);
3137 TALLOC_FREE(Announce);
3138 if (ret != PAM_SUCCESS) {
3139 _pam_log(ctx, LOG_NOTICE,
3140 "password - (old) token not obtained");
3141 goto out;
3142 }
3143
3144 /* verify that this is the password for this user */
3145
3146 ret = winbind_auth_request(ctx, user, pass_old,
3147 NULL, NULL, 0,
3148 &error, NULL,
3149 &pwdlastset_prelim, NULL);
3150
3151 if (ret != PAM_ACCT_EXPIRED &&
3152 ret != PAM_AUTHTOK_EXPIRED &&
3153 ret != PAM_NEW_AUTHTOK_REQD &&
3154 ret != PAM_SUCCESS) {
3155 pass_old = NULL;
3156 goto out;
3157 }
3158
3159 pam_set_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3160 (void *)pwdlastset_prelim, NULL);
3161
3162 ret = pam_set_item(pamh, PAM_OLDAUTHTOK,
3163 (const void *) pass_old);
3164 pass_old = NULL;
3165 if (ret != PAM_SUCCESS) {
3166 _pam_log(ctx, LOG_CRIT,
3167 "failed to set PAM_OLDAUTHTOK");
3168 }
3169 } else if (flags & PAM_UPDATE_AUTHTOK) {
3170
3171 time_t pwdlastset_update = 0;
3172
3173 /*
3174 * obtain the proposed password
3175 */
3176
3177 /*
3178 * get the old token back.
3179 */
3180
3181 ret = pam_get_item(pamh, PAM_OLDAUTHTOK, (const void **) &pass_old);
3182
3183 if (ret != PAM_SUCCESS) {
3184 _pam_log(ctx, LOG_NOTICE,
3185 "user not authenticated");
3186 goto out;
3187 }
3188
3189 lctrl = ctx->ctrl & ~WINBIND_TRY_FIRST_PASS_ARG;
3190
3191 if (on(WINBIND_USE_AUTHTOK_ARG, lctrl)) {
3192 lctrl |= WINBIND_USE_FIRST_PASS_ARG;
3193 }
3194 if (on(WINBIND_TRY_AUTHTOK_ARG, lctrl)) {
3195 lctrl |= WINBIND_TRY_FIRST_PASS_ARG;
3196 }
3197 retry = 0;
3198 ret = PAM_AUTHTOK_ERR;
3199 while ((ret != PAM_SUCCESS) && (retry++ < MAX_PASSWD_TRIES)) {
3200 /*
3201 * use_authtok is to force the use of a previously entered
3202 * password -- needed for pluggable password strength checking
3203 */
3204
3205 ret = _winbind_read_password(ctx, lctrl,
3206 NULL,
3207 _("Enter new NT password: "),
3208 _("Retype new NT password: "),
3209 (const char **)&pass_new);
3210
3211 if (ret != PAM_SUCCESS) {
3212 _pam_log_debug(ctx, LOG_ALERT,
3213 "password - "
3214 "new password not obtained");
3215 pass_old = NULL;/* tidy up */
3216 goto out;
3217 }
3218
3219 /*
3220 * At this point we know who the user is and what they
3221 * propose as their new password. Verify that the new
3222 * password is acceptable.
3223 */
3224
3225 if (pass_new[0] == '\0') {/* "\0" password = NULL */
3226 pass_new = NULL;
3227 }
3228 }
3229
3230 /*
3231 * By reaching here we have approved the passwords and must now
3232 * rebuild the password database file.
3233 */
3234 pam_get_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3235 (const void **) &pwdlastset_update);
3236
3237 /*
3238 * if cached creds were enabled, make sure to set the
3239 * WINBIND_CACHED_LOGIN bit here in order to have winbindd
3240 * update the cached creds storage - gd
3241 */
3242 if (cached_login) {
3243 ctx->ctrl |= WINBIND_CACHED_LOGIN;
3244 }
3245
3246 ret = winbind_chauthtok_request(ctx, user, pass_old,
3247 pass_new, pwdlastset_update);
3248 if (ret != PAM_SUCCESS) {
3249 pass_old = pass_new = NULL;
3250 goto out;
3251 }
3252
3253 if (_pam_require_krb5_auth_after_chauthtok(ctx, user)) {
3254
3255 const char *member = NULL;
3256 const char *cctype = NULL;
3257 int warn_pwd_expire;
3258 struct wbcLogonUserInfo *info = NULL;
3259
3260 member = get_member_from_config(ctx);
3261 cctype = get_krb5_cc_type_from_config(ctx);
3262 warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
3263
3264 /* Keep WINBIND_CACHED_LOGIN bit for
3265 * authentication after changing the password.
3266 * This will update the cached credentials in case
3267 * that winbindd_dual_pam_chauthtok() fails
3268 * to update them.
3269 * --- BoYang
3270 * */
3271
3272 ret = winbind_auth_request(ctx, user, pass_new,
3273 member, cctype, 0,
3274 &error, &info,
3275 NULL, &username_ret);
3276 pass_old = pass_new = NULL;
3277
3278 if (ret == PAM_SUCCESS) {
3279
3280 struct wbcAuthUserInfo *user_info = NULL;
3281
3282 if (info && info->info) {
3283 user_info = info->info;
3284 }
3285
3286 /* warn a user if the password is about to
3287 * expire soon */
3288 _pam_warn_password_expiry(ctx, user_info,
3289 warn_pwd_expire,
3290 NULL, NULL);
3291
3292 /* set some info3 info for other modules in the
3293 * stack */
3294 _pam_set_data_info3(ctx, user_info);
3295
3296 /* put krb5ccname into env */
3297 _pam_setup_krb5_env(ctx, info);
3298
3299 if (username_ret) {
3300 pam_set_item(pamh, PAM_USER,
3301 username_ret);
3302 _pam_log_debug(ctx, LOG_INFO,
3303 "Returned user was '%s'",
3304 username_ret);
3305 free(username_ret);
3306 }
3307
3308 }
3309
3310 if (info && info->blobs) {
3311 wbcFreeMemory(info->blobs);
3312 }
3313 wbcFreeMemory(info);
3314
3315 goto out;
3316 }
3317 } else {
3318 ret = PAM_SERVICE_ERR;
3319 }
3320
3321 out:
3322 {
3323 /* Deal with offline errors. */
3324 int i;
3325 const char *codes[] = {
3326 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
3327 "NT_STATUS_NO_LOGON_SERVERS",
3328 "NT_STATUS_ACCESS_DENIED"
3329 };
3330
3331 for (i=0; i<ARRAY_SIZE(codes); i++) {
3332 int _ret;
3333 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
3334 break;
3335 }
3336 }
3337 }
3338
3339 wbcFreeMemory(error);
3340
3341 _PAM_LOG_FUNCTION_LEAVE("pam_sm_chauthtok", ctx, ret);
3342
3343 TALLOC_FREE(ctx);
3344
3345 return ret;
3346 }
3347
3348 #ifdef PAM_STATIC
3349
3350 /* static module data */
3351
3352 struct pam_module _pam_winbind_modstruct = {
3353 MODULE_NAME,
3354 pam_sm_authenticate,
3355 pam_sm_setcred,
3356 pam_sm_acct_mgmt,
3357 pam_sm_open_session,
3358 pam_sm_close_session,
3359 pam_sm_chauthtok
3360 };
3361
3362 #endif
3363
3364 /*
3365 * Copyright (c) Andrew Tridgell <tridge@samba.org> 2000
3366 * Copyright (c) Tim Potter <tpot@samba.org> 2000
3367 * Copyright (c) Andrew Bartlettt <abartlet@samba.org> 2002
3368 * Copyright (c) Guenther Deschner <gd@samba.org> 2005-2008
3369 * Copyright (c) Jan Rêkorajski 1999.
3370 * Copyright (c) Andrew G. Morgan 1996-8.
3371 * Copyright (c) Alex O. Yuriev, 1996.
3372 * Copyright (c) Cristian Gafton 1996.
3373 * Copyright (C) Elliot Lee <sopwith@redhat.com> 1996, Red Hat Software.
3374 *
3375 * Redistribution and use in source and binary forms, with or without
3376 * modification, are permitted provided that the following conditions
3377 * are met:
3378 * 1. Redistributions of source code must retain the above copyright
3379 * notice, and the entire permission notice in its entirety,
3380 * including the disclaimer of warranties.
3381 * 2. Redistributions in binary form must reproduce the above copyright
3382 * notice, this list of conditions and the following disclaimer in the
3383 * documentation and/or other materials provided with the distribution.
3384 * 3. The name of the author may not be used to endorse or promote
3385 * products derived from this software without specific prior
3386 * written permission.
3387 *
3388 * ALTERNATIVELY, this product may be distributed under the terms of
3389 * the GNU Public License, in which case the provisions of the GPL are
3390 * required INSTEAD OF the above restrictions. (This clause is
3391 * necessary due to a potential bad interaction between the GPL and
3392 * the restrictions contained in a BSD-style copyright.)
3393 *
3394 * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
3395 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
3396 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
3397 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
3398 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
3399 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
3400 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
3401 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
3402 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
3403 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
3404 * OF THE POSSIBILITY OF SUCH DAMAGE.
3405 */
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