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s3:lib/select: don't overwrite errno in the signal handler
[Samba.git] / nsswitch / pam_winbind.c
blob324bede9ea38ec3854c050cdc80081dde059755f
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 #define CONST_DISCARD(type,ptr) ((type)(void *)ptr)
15
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, dyn_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(CONST_DISCARD(char *, config_file));
416 if (d == NULL) {
417 goto config_from_pam;
418 }
419
420 if (iniparser_getboolean(d, CONST_DISCARD(char *, "global:debug"), false)) {
421 ctrl |= WINBIND_DEBUG_ARG;
422 }
423
424 if (iniparser_getboolean(d, CONST_DISCARD(char *, "global:debug_state"), false)) {
425 ctrl |= WINBIND_DEBUG_STATE;
426 }
427
428 if (iniparser_getboolean(d, CONST_DISCARD(char *, "global:cached_login"), false)) {
429 ctrl |= WINBIND_CACHED_LOGIN;
430 }
431
432 if (iniparser_getboolean(d, CONST_DISCARD(char *, "global:krb5_auth"), false)) {
433 ctrl |= WINBIND_KRB5_AUTH;
434 }
435
436 if (iniparser_getboolean(d, CONST_DISCARD(char *, "global:silent"), false)) {
437 ctrl |= WINBIND_SILENT;
438 }
439
440 if (iniparser_getstr(d, CONST_DISCARD(char *, "global:krb5_ccache_type")) != NULL) {
441 ctrl |= WINBIND_KRB5_CCACHE_TYPE;
442 }
443
444 if ((iniparser_getstr(d, CONST_DISCARD(char *, "global:require-membership-of"))
445 != NULL) ||
446 (iniparser_getstr(d, CONST_DISCARD(char *, "global:require_membership_of"))
447 != NULL)) {
448 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
449 }
450
451 if (iniparser_getboolean(d, CONST_DISCARD(char *, "global:try_first_pass"), false)) {
452 ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
453 }
454
455 if (iniparser_getint(d, CONST_DISCARD(char *, "global:warn_pwd_expire"), 0)) {
456 ctrl |= WINBIND_WARN_PWD_EXPIRE;
457 }
458
459 if (iniparser_getboolean(d, CONST_DISCARD(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_P(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
811 /**
812 * send a password expiry message if required
813 *
814 * @param ctx PAM winbind context.
815 * @param next_change expected (calculated) next expiry date.
816 * @param already_expired pointer to a boolean to indicate if the password is
817 * already expired.
818 *
819 * @return boolean Returns true if message has been sent, false if not.
820 */
821
822 static bool _pam_send_password_expiry_message(struct pwb_context *ctx,
823 time_t next_change,
824 time_t now,
825 int warn_pwd_expire,
826 bool *already_expired)
827 {
828 int days = 0;
829 struct tm tm_now, tm_next_change;
830
831 if (already_expired) {
832 *already_expired = false;
833 }
834
835 if (next_change <= now) {
836 PAM_WB_REMARK_DIRECT(ctx, "NT_STATUS_PASSWORD_EXPIRED");
837 if (already_expired) {
838 *already_expired = true;
839 }
840 return true;
841 }
842
843 if ((next_change < 0) ||
844 (next_change > now + warn_pwd_expire * SECONDS_PER_DAY)) {
845 return false;
846 }
847
848 if ((localtime_r(&now, &tm_now) == NULL) ||
849 (localtime_r(&next_change, &tm_next_change) == NULL)) {
850 return false;
851 }
852
853 days = (tm_next_change.tm_yday+tm_next_change.tm_year*365) -
854 (tm_now.tm_yday+tm_now.tm_year*365);
855
856 if (days == 0) {
857 _make_remark(ctx, PAM_TEXT_INFO,
858 _("Your password expires today"));
859 return true;
860 }
861
862 if (days > 0 && days < warn_pwd_expire) {
863 _make_remark_format(ctx, PAM_TEXT_INFO,
864 _("Your password will expire in %d %s"),
865 days, (days > 1) ? _("days"):_("day"));
866 return true;
867 }
868
869 return false;
870 }
871
872 /**
873 * Send a warning if the password expires in the near future
874 *
875 * @param ctx PAM winbind context.
876 * @param response The full authentication response structure.
877 * @param already_expired boolean, is the pwd already expired?
878 *
879 * @return void.
880 */
881
882 static void _pam_warn_password_expiry(struct pwb_context *ctx,
883 const struct wbcAuthUserInfo *info,
884 const struct wbcUserPasswordPolicyInfo *policy,
885 int warn_pwd_expire,
886 bool *already_expired)
887 {
888 time_t now = time(NULL);
889 time_t next_change = 0;
890
891 if (!info || !policy) {
892 return;
893 }
894
895 if (already_expired) {
896 *already_expired = false;
897 }
898
899 /* accounts with WBC_ACB_PWNOEXP set never receive a warning */
900 if (info->acct_flags & WBC_ACB_PWNOEXP) {
901 return;
902 }
903
904 /* no point in sending a warning if this is a grace logon */
905 if (PAM_WB_GRACE_LOGON(info->user_flags)) {
906 return;
907 }
908
909 /* check if the info3 must change timestamp has been set */
910 next_change = info->pass_must_change_time;
911
912 if (_pam_send_password_expiry_message(ctx, next_change, now,
913 warn_pwd_expire,
914 already_expired)) {
915 return;
916 }
917
918 /* now check for the global password policy */
919 /* good catch from Ralf Haferkamp: an expiry of "never" is translated
920 * to -1 */
921 if ((policy->expire == (int64_t)-1) ||
922 (policy->expire == 0)) {
923 return;
924 }
925
926 next_change = info->pass_last_set_time + policy->expire;
927
928 if (_pam_send_password_expiry_message(ctx, next_change, now,
929 warn_pwd_expire,
930 already_expired)) {
931 return;
932 }
933
934 /* no warning sent */
935 }
936
937 #define IS_SID_STRING(name) (strncmp("S-", name, 2) == 0)
938
939 /**
940 * Append a string, making sure not to overflow and to always return a
941 * NULL-terminated string.
942 *
943 * @param dest Destination string buffer (must already be NULL-terminated).
944 * @param src Source string buffer.
945 * @param dest_buffer_size Size of dest buffer in bytes.
946 *
947 * @return false if dest buffer is not big enough (no bytes copied), true on
948 * success.
949 */
950
951 static bool safe_append_string(char *dest,
952 const char *src,
953 int dest_buffer_size)
954 {
955 int dest_length = strlen(dest);
956 int src_length = strlen(src);
957
958 if (dest_length + src_length + 1 > dest_buffer_size) {
959 return false;
960 }
961
962 memcpy(dest + dest_length, src, src_length + 1);
963 return true;
964 }
965
966 /**
967 * Convert a names into a SID string, appending it to a buffer.
968 *
969 * @param ctx PAM winbind context.
970 * @param user User in PAM request.
971 * @param name Name to convert.
972 * @param sid_list_buffer Where to append the string sid.
973 * @param sid_list_buffer Size of sid_list_buffer (in bytes).
974 *
975 * @return false on failure, true on success.
976 */
977 static bool winbind_name_to_sid_string(struct pwb_context *ctx,
978 const char *user,
979 const char *name,
980 char *sid_list_buffer,
981 int sid_list_buffer_size)
982 {
983 const char* sid_string;
984
985 /* lookup name? */
986 if (IS_SID_STRING(name)) {
987 sid_string = name;
988 } else {
989 wbcErr wbc_status;
990 struct wbcDomainSid sid;
991 enum wbcSidType type;
992 char *sid_str;
993
994 _pam_log_debug(ctx, LOG_DEBUG,
995 "no sid given, looking up: %s\n", name);
996
997 wbc_status = wbcLookupName("", name, &sid, &type);
998 if (!WBC_ERROR_IS_OK(wbc_status)) {
999 _pam_log(ctx, LOG_INFO,
1000 "could not lookup name: %s\n", name);
1001 return false;
1002 }
1003
1004 wbc_status = wbcSidToString(&sid, &sid_str);
1005 if (!WBC_ERROR_IS_OK(wbc_status)) {
1006 return false;
1007 }
1008
1009 wbcFreeMemory(sid_str);
1010 sid_string = sid_str;
1011 }
1012
1013 if (!safe_append_string(sid_list_buffer, sid_string,
1014 sid_list_buffer_size)) {
1015 return false;
1016 }
1017
1018 return true;
1019 }
1020
1021 /**
1022 * Convert a list of names into a list of sids.
1023 *
1024 * @param ctx PAM winbind context.
1025 * @param user User in PAM request.
1026 * @param name_list List of names or string sids, separated by commas.
1027 * @param sid_list_buffer Where to put the list of string sids.
1028 * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1029 *
1030 * @return false on failure, true on success.
1031 */
1032 static bool winbind_name_list_to_sid_string_list(struct pwb_context *ctx,
1033 const char *user,
1034 const char *name_list,
1035 char *sid_list_buffer,
1036 int sid_list_buffer_size)
1037 {
1038 bool result = false;
1039 char *current_name = NULL;
1040 const char *search_location;
1041 const char *comma;
1042
1043 if (sid_list_buffer_size > 0) {
1044 sid_list_buffer[0] = 0;
1045 }
1046
1047 search_location = name_list;
1048 while ((comma = strstr(search_location, ",")) != NULL) {
1049 current_name = strndup(search_location,
1050 comma - search_location);
1051 if (NULL == current_name) {
1052 goto out;
1053 }
1054
1055 if (!winbind_name_to_sid_string(ctx, user,
1056 current_name,
1057 sid_list_buffer,
1058 sid_list_buffer_size)) {
1059 goto out;
1060 }
1061
1062 SAFE_FREE(current_name);
1063
1064 if (!safe_append_string(sid_list_buffer, ",",
1065 sid_list_buffer_size)) {
1066 goto out;
1067 }
1068
1069 search_location = comma + 1;
1070 }
1071
1072 if (!winbind_name_to_sid_string(ctx, user, search_location,
1073 sid_list_buffer,
1074 sid_list_buffer_size)) {
1075 goto out;
1076 }
1077
1078 result = true;
1079
1080 out:
1081 SAFE_FREE(current_name);
1082 return result;
1083 }
1084
1085 /**
1086 * put krb5ccname variable into environment
1087 *
1088 * @param ctx PAM winbind context.
1089 * @param krb5ccname env variable retrieved from winbindd.
1090 *
1091 * @return void.
1092 */
1093
1094 static void _pam_setup_krb5_env(struct pwb_context *ctx,
1095 struct wbcLogonUserInfo *info)
1096 {
1097 char var[PATH_MAX];
1098 int ret;
1099 uint32_t i;
1100 const char *krb5ccname = NULL;
1101
1102 if (off(ctx->ctrl, WINBIND_KRB5_AUTH)) {
1103 return;
1104 }
1105
1106 if (!info) {
1107 return;
1108 }
1109
1110 for (i=0; i < info->num_blobs; i++) {
1111 if (strcasecmp(info->blobs[i].name, "krb5ccname") == 0) {
1112 krb5ccname = (const char *)info->blobs[i].blob.data;
1113 break;
1114 }
1115 }
1116
1117 if (!krb5ccname || (strlen(krb5ccname) == 0)) {
1118 return;
1119 }
1120
1121 _pam_log_debug(ctx, LOG_DEBUG,
1122 "request returned KRB5CCNAME: %s", krb5ccname);
1123
1124 if (snprintf(var, sizeof(var), "KRB5CCNAME=%s", krb5ccname) == -1) {
1125 return;
1126 }
1127
1128 ret = pam_putenv(ctx->pamh, var);
1129 if (ret) {
1130 _pam_log(ctx, LOG_ERR,
1131 "failed to set KRB5CCNAME to %s: %s",
1132 var, pam_strerror(ctx->pamh, ret));
1133 }
1134 }
1135
1136 /**
1137 * Copy unix username if available (further processed in PAM).
1138 *
1139 * @param ctx PAM winbind context
1140 * @param user_ret A pointer that holds a pointer to a string
1141 * @param unix_username A username
1142 *
1143 * @return void.
1144 */
1145
1146 static void _pam_setup_unix_username(struct pwb_context *ctx,
1147 char **user_ret,
1148 struct wbcLogonUserInfo *info)
1149 {
1150 const char *unix_username = NULL;
1151 uint32_t i;
1152
1153 if (!user_ret || !info) {
1154 return;
1155 }
1156
1157 for (i=0; i < info->num_blobs; i++) {
1158 if (strcasecmp(info->blobs[i].name, "unix_username") == 0) {
1159 unix_username = (const char *)info->blobs[i].blob.data;
1160 break;
1161 }
1162 }
1163
1164 if (!unix_username || !unix_username[0]) {
1165 return;
1166 }
1167
1168 *user_ret = strdup(unix_username);
1169 }
1170
1171 /**
1172 * Set string into the PAM stack.
1173 *
1174 * @param ctx PAM winbind context.
1175 * @param data_name Key name for pam_set_data.
1176 * @param value String value.
1177 *
1178 * @return void.
1179 */
1180
1181 static void _pam_set_data_string(struct pwb_context *ctx,
1182 const char *data_name,
1183 const char *value)
1184 {
1185 int ret;
1186
1187 if (!data_name || !value || (strlen(data_name) == 0) ||
1188 (strlen(value) == 0)) {
1189 return;
1190 }
1191
1192 ret = pam_set_data(ctx->pamh, data_name, talloc_strdup(NULL, value),
1193 _pam_winbind_cleanup_func);
1194 if (ret) {
1195 _pam_log_debug(ctx, LOG_DEBUG,
1196 "Could not set data %s: %s\n",
1197 data_name, pam_strerror(ctx->pamh, ret));
1198 }
1199 }
1200
1201 /**
1202 * Set info3 strings into the PAM stack.
1203 *
1204 * @param ctx PAM winbind context.
1205 * @param data_name Key name for pam_set_data.
1206 * @param value String value.
1207 *
1208 * @return void.
1209 */
1210
1211 static void _pam_set_data_info3(struct pwb_context *ctx,
1212 const struct wbcAuthUserInfo *info)
1213 {
1214 _pam_set_data_string(ctx, PAM_WINBIND_HOMEDIR,
1215 info->home_directory);
1216 _pam_set_data_string(ctx, PAM_WINBIND_LOGONSCRIPT,
1217 info->logon_script);
1218 _pam_set_data_string(ctx, PAM_WINBIND_LOGONSERVER,
1219 info->logon_server);
1220 _pam_set_data_string(ctx, PAM_WINBIND_PROFILEPATH,
1221 info->profile_path);
1222 }
1223
1224 /**
1225 * Free info3 strings in the PAM stack.
1226 *
1227 * @param pamh PAM handle
1228 *
1229 * @return void.
1230 */
1231
1232 static void _pam_free_data_info3(pam_handle_t *pamh)
1233 {
1234 pam_set_data(pamh, PAM_WINBIND_HOMEDIR, NULL, NULL);
1235 pam_set_data(pamh, PAM_WINBIND_LOGONSCRIPT, NULL, NULL);
1236 pam_set_data(pamh, PAM_WINBIND_LOGONSERVER, NULL, NULL);
1237 pam_set_data(pamh, PAM_WINBIND_PROFILEPATH, NULL, NULL);
1238 }
1239
1240 /**
1241 * Send PAM_ERROR_MSG for cached or grace logons.
1242 *
1243 * @param ctx PAM winbind context.
1244 * @param username User in PAM request.
1245 * @param info3_user_flgs Info3 flags containing logon type bits.
1246 *
1247 * @return void.
1248 */
1249
1250 static void _pam_warn_logon_type(struct pwb_context *ctx,
1251 const char *username,
1252 uint32_t info3_user_flgs)
1253 {
1254 /* inform about logon type */
1255 if (PAM_WB_GRACE_LOGON(info3_user_flgs)) {
1256
1257 _make_remark(ctx, PAM_ERROR_MSG,
1258 _("Grace login. "
1259 "Please change your password as soon you're "
1260 "online again"));
1261 _pam_log_debug(ctx, LOG_DEBUG,
1262 "User %s logged on using grace logon\n",
1263 username);
1264
1265 } else if (PAM_WB_CACHED_LOGON(info3_user_flgs)) {
1266
1267 _make_remark(ctx, PAM_ERROR_MSG,
1268 _("Domain Controller unreachable, "
1269 "using cached credentials instead. "
1270 "Network resources may be unavailable"));
1271 _pam_log_debug(ctx, LOG_DEBUG,
1272 "User %s logged on using cached credentials\n",
1273 username);
1274 }
1275 }
1276
1277 /**
1278 * Send PAM_ERROR_MSG for krb5 errors.
1279 *
1280 * @param ctx PAM winbind context.
1281 * @param username User in PAM request.
1282 * @param info3_user_flgs Info3 flags containing logon type bits.
1283 *
1284 * @return void.
1285 */
1286
1287 static void _pam_warn_krb5_failure(struct pwb_context *ctx,
1288 const char *username,
1289 uint32_t info3_user_flgs)
1290 {
1291 if (PAM_WB_KRB5_CLOCK_SKEW(info3_user_flgs)) {
1292 _make_remark(ctx, PAM_ERROR_MSG,
1293 _("Failed to establish your Kerberos Ticket cache "
1294 "due time differences\n"
1295 "with the domain controller. "
1296 "Please verify the system time.\n"));
1297 _pam_log_debug(ctx, LOG_DEBUG,
1298 "User %s: Clock skew when getting Krb5 TGT\n",
1299 username);
1300 }
1301 }
1302
1303 static bool _pam_check_remark_auth_err(struct pwb_context *ctx,
1304 const struct wbcAuthErrorInfo *e,
1305 const char *nt_status_string,
1306 int *pam_error)
1307 {
1308 const char *ntstatus = NULL;
1309 const char *error_string = NULL;
1310
1311 if (!e || !pam_error) {
1312 return false;
1313 }
1314
1315 ntstatus = e->nt_string;
1316 if (!ntstatus) {
1317 return false;
1318 }
1319
1320 if (strcasecmp(ntstatus, nt_status_string) == 0) {
1321
1322 error_string = _get_ntstatus_error_string(nt_status_string);
1323 if (error_string) {
1324 _make_remark(ctx, PAM_ERROR_MSG, error_string);
1325 *pam_error = e->pam_error;
1326 return true;
1327 }
1328
1329 if (e->display_string) {
1330 _make_remark(ctx, PAM_ERROR_MSG, e->display_string);
1331 *pam_error = e->pam_error;
1332 return true;
1333 }
1334
1335 _make_remark(ctx, PAM_ERROR_MSG, nt_status_string);
1336 *pam_error = e->pam_error;
1337
1338 return true;
1339 }
1340
1341 return false;
1342 };
1343
1344 /**
1345 * Compose Password Restriction String for a PAM_ERROR_MSG conversation.
1346 *
1347 * @param i The wbcUserPasswordPolicyInfo struct.
1348 *
1349 * @return string (caller needs to talloc_free).
1350 */
1351
1352 static char *_pam_compose_pwd_restriction_string(struct pwb_context *ctx,
1353 struct wbcUserPasswordPolicyInfo *i)
1354 {
1355 char *str = NULL;
1356
1357 if (!i) {
1358 goto failed;
1359 }
1360
1361 str = talloc_asprintf(ctx, _("Your password "));
1362 if (!str) {
1363 goto failed;
1364 }
1365
1366 if (i->min_length_password > 0) {
1367 str = talloc_asprintf_append(str,
1368 _("must be at least %d characters; "),
1369 i->min_length_password);
1370 if (!str) {
1371 goto failed;
1372 }
1373 }
1374
1375 if (i->password_history > 0) {
1376 str = talloc_asprintf_append(str,
1377 _("cannot repeat any of your previous %d "
1378 "passwords; "),
1379 i->password_history);
1380 if (!str) {
1381 goto failed;
1382 }
1383 }
1384
1385 if (i->password_properties & WBC_DOMAIN_PASSWORD_COMPLEX) {
1386 str = talloc_asprintf_append(str,
1387 _("must contain capitals, numerals "
1388 "or punctuation; "
1389 "and cannot contain your account "
1390 "or full name; "));
1391 if (!str) {
1392 goto failed;
1393 }
1394 }
1395
1396 str = talloc_asprintf_append(str,
1397 _("Please type a different password. "
1398 "Type a password which meets these requirements in "
1399 "both text boxes."));
1400 if (!str) {
1401 goto failed;
1402 }
1403
1404 return str;
1405
1406 failed:
1407 TALLOC_FREE(str);
1408 return NULL;
1409 }
1410
1411 static int _pam_create_homedir(struct pwb_context *ctx,
1412 const char *dirname,
1413 mode_t mode)
1414 {
1415 struct stat sbuf;
1416
1417 if (stat(dirname, &sbuf) == 0) {
1418 return PAM_SUCCESS;
1419 }
1420
1421 if (mkdir(dirname, mode) != 0) {
1422
1423 _make_remark_format(ctx, PAM_TEXT_INFO,
1424 _("Creating directory: %s failed: %s"),
1425 dirname, strerror(errno));
1426 _pam_log(ctx, LOG_ERR, "could not create dir: %s (%s)",
1427 dirname, strerror(errno));
1428 return PAM_PERM_DENIED;
1429 }
1430
1431 return PAM_SUCCESS;
1432 }
1433
1434 static int _pam_chown_homedir(struct pwb_context *ctx,
1435 const char *dirname,
1436 uid_t uid,
1437 gid_t gid)
1438 {
1439 if (chown(dirname, uid, gid) != 0) {
1440 _pam_log(ctx, LOG_ERR, "failed to chown user homedir: %s (%s)",
1441 dirname, strerror(errno));
1442 return PAM_PERM_DENIED;
1443 }
1444
1445 return PAM_SUCCESS;
1446 }
1447
1448 static int _pam_mkhomedir(struct pwb_context *ctx)
1449 {
1450 struct passwd *pwd = NULL;
1451 char *token = NULL;
1452 char *create_dir = NULL;
1453 char *user_dir = NULL;
1454 int ret;
1455 const char *username;
1456 mode_t mode = 0700;
1457 char *safe_ptr = NULL;
1458 char *p = NULL;
1459
1460 /* Get the username */
1461 ret = pam_get_user(ctx->pamh, &username, NULL);
1462 if ((ret != PAM_SUCCESS) || (!username)) {
1463 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1464 return PAM_SERVICE_ERR;
1465 }
1466
1467 pwd = getpwnam(username);
1468 if (pwd == NULL) {
1469 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1470 return PAM_USER_UNKNOWN;
1471 }
1472 _pam_log_debug(ctx, LOG_DEBUG, "homedir is: %s", pwd->pw_dir);
1473
1474 ret = _pam_create_homedir(ctx, pwd->pw_dir, 0700);
1475 if (ret == PAM_SUCCESS) {
1476 ret = _pam_chown_homedir(ctx, pwd->pw_dir,
1477 pwd->pw_uid,
1478 pwd->pw_gid);
1479 }
1480
1481 if (ret == PAM_SUCCESS) {
1482 return ret;
1483 }
1484
1485 /* maybe we need to create parent dirs */
1486 create_dir = talloc_strdup(ctx, "/");
1487 if (!create_dir) {
1488 return PAM_BUF_ERR;
1489 }
1490
1491 /* find final directory */
1492 user_dir = strrchr(pwd->pw_dir, '/');
1493 if (!user_dir) {
1494 return PAM_BUF_ERR;
1495 }
1496 user_dir++;
1497
1498 _pam_log(ctx, LOG_DEBUG, "final directory: %s", user_dir);
1499
1500 p = pwd->pw_dir;
1501
1502 while ((token = strtok_r(p, "/", &safe_ptr)) != NULL) {
1503
1504 mode = 0755;
1505
1506 p = NULL;
1507
1508 _pam_log_debug(ctx, LOG_DEBUG, "token is %s", token);
1509
1510 create_dir = talloc_asprintf_append(create_dir, "%s/", token);
1511 if (!create_dir) {
1512 return PAM_BUF_ERR;
1513 }
1514 _pam_log_debug(ctx, LOG_DEBUG, "current_dir is %s", create_dir);
1515
1516 if (strcmp(token, user_dir) == 0) {
1517 _pam_log_debug(ctx, LOG_DEBUG, "assuming last directory: %s", token);
1518 mode = 0700;
1519 }
1520
1521 ret = _pam_create_homedir(ctx, create_dir, mode);
1522 if (ret) {
1523 return ret;
1524 }
1525 }
1526
1527 return _pam_chown_homedir(ctx, create_dir,
1528 pwd->pw_uid,
1529 pwd->pw_gid);
1530 }
1531
1532 /* talk to winbindd */
1533 static int winbind_auth_request(struct pwb_context *ctx,
1534 const char *user,
1535 const char *pass,
1536 const char *member,
1537 const char *cctype,
1538 const int warn_pwd_expire,
1539 struct wbcAuthErrorInfo **p_error,
1540 struct wbcLogonUserInfo **p_info,
1541 struct wbcUserPasswordPolicyInfo **p_policy,
1542 time_t *pwd_last_set,
1543 char **user_ret)
1544 {
1545 wbcErr wbc_status;
1546
1547 struct wbcLogonUserParams logon;
1548 char membership_of[1024];
1549 uid_t user_uid = -1;
1550 uint32_t flags = WBFLAG_PAM_INFO3_TEXT |
1551 WBFLAG_PAM_GET_PWD_POLICY;
1552
1553 struct wbcLogonUserInfo *info = NULL;
1554 struct wbcAuthUserInfo *user_info = NULL;
1555 struct wbcAuthErrorInfo *error = NULL;
1556 struct wbcUserPasswordPolicyInfo *policy = NULL;
1557
1558 int ret = PAM_AUTH_ERR;
1559 int i;
1560 const char *codes[] = {
1561 "NT_STATUS_PASSWORD_EXPIRED",
1562 "NT_STATUS_PASSWORD_MUST_CHANGE",
1563 "NT_STATUS_INVALID_WORKSTATION",
1564 "NT_STATUS_INVALID_LOGON_HOURS",
1565 "NT_STATUS_ACCOUNT_EXPIRED",
1566 "NT_STATUS_ACCOUNT_DISABLED",
1567 "NT_STATUS_ACCOUNT_LOCKED_OUT",
1568 "NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
1569 "NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
1570 "NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
1571 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1572 "NT_STATUS_NO_LOGON_SERVERS",
1573 "NT_STATUS_WRONG_PASSWORD",
1574 "NT_STATUS_ACCESS_DENIED"
1575 };
1576
1577 if (pwd_last_set) {
1578 *pwd_last_set = 0;
1579 }
1580
1581 /* Krb5 auth always has to go against the KDC of the user's realm */
1582
1583 if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1584 flags |= WBFLAG_PAM_CONTACT_TRUSTDOM;
1585 }
1586
1587 if (ctx->ctrl & (WINBIND_KRB5_AUTH|WINBIND_CACHED_LOGIN)) {
1588 struct passwd *pwd = NULL;
1589
1590 pwd = getpwnam(user);
1591 if (pwd == NULL) {
1592 return PAM_USER_UNKNOWN;
1593 }
1594 user_uid = pwd->pw_uid;
1595 }
1596
1597 if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1598
1599 _pam_log_debug(ctx, LOG_DEBUG,
1600 "enabling krb5 login flag\n");
1601
1602 flags |= WBFLAG_PAM_KRB5 |
1603 WBFLAG_PAM_FALLBACK_AFTER_KRB5;
1604 }
1605
1606 if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1607 _pam_log_debug(ctx, LOG_DEBUG,
1608 "enabling cached login flag\n");
1609 flags |= WBFLAG_PAM_CACHED_LOGIN;
1610 }
1611
1612 if (user_ret) {
1613 *user_ret = NULL;
1614 flags |= WBFLAG_PAM_UNIX_NAME;
1615 }
1616
1617 if (cctype != NULL) {
1618 _pam_log_debug(ctx, LOG_DEBUG,
1619 "enabling request for a %s krb5 ccache\n",
1620 cctype);
1621 }
1622
1623 if (member != NULL) {
1624
1625 ZERO_STRUCT(membership_of);
1626
1627 if (!winbind_name_list_to_sid_string_list(ctx, user, member,
1628 membership_of,
1629 sizeof(membership_of))) {
1630 _pam_log_debug(ctx, LOG_ERR,
1631 "failed to serialize membership of sid "
1632 "\"%s\"\n", member);
1633 return PAM_AUTH_ERR;
1634 }
1635 }
1636
1637 ZERO_STRUCT(logon);
1638
1639 logon.username = user;
1640 logon.password = pass;
1641
1642 if (cctype) {
1643 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1644 &logon.blobs,
1645 "krb5_cc_type",
1646 0,
1647 (uint8_t *)cctype,
1648 strlen(cctype)+1);
1649 if (!WBC_ERROR_IS_OK(wbc_status)) {
1650 goto done;
1651 }
1652 }
1653
1654 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1655 &logon.blobs,
1656 "flags",
1657 0,
1658 (uint8_t *)&flags,
1659 sizeof(flags));
1660 if (!WBC_ERROR_IS_OK(wbc_status)) {
1661 goto done;
1662 }
1663
1664 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1665 &logon.blobs,
1666 "user_uid",
1667 0,
1668 (uint8_t *)&user_uid,
1669 sizeof(user_uid));
1670 if (!WBC_ERROR_IS_OK(wbc_status)) {
1671 goto done;
1672 }
1673
1674 if (member) {
1675 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1676 &logon.blobs,
1677 "membership_of",
1678 0,
1679 (uint8_t *)membership_of,
1680 sizeof(membership_of));
1681 if (!WBC_ERROR_IS_OK(wbc_status)) {
1682 goto done;
1683 }
1684 }
1685
1686 wbc_status = wbcLogonUser(&logon, &info, &error, &policy);
1687 ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1688 user, "wbcLogonUser");
1689 wbcFreeMemory(logon.blobs);
1690 logon.blobs = NULL;
1691
1692 if (info && info->info) {
1693 user_info = info->info;
1694 }
1695
1696 if (pwd_last_set && user_info) {
1697 *pwd_last_set = user_info->pass_last_set_time;
1698 }
1699
1700 if (p_info && info) {
1701 *p_info = info;
1702 }
1703
1704 if (p_policy && policy) {
1705 *p_policy = policy;
1706 }
1707
1708 if (p_error && error) {
1709 /* We want to process the error in the caller. */
1710 *p_error = error;
1711 return ret;
1712 }
1713
1714 for (i=0; i<ARRAY_SIZE(codes); i++) {
1715 int _ret = ret;
1716 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1717 ret = _ret;
1718 goto done;
1719 }
1720 }
1721
1722 if ((ret == PAM_SUCCESS) && user_info && policy && info) {
1723
1724 bool already_expired = false;
1725
1726 /* warn a user if the password is about to expire soon */
1727 _pam_warn_password_expiry(ctx, user_info, policy,
1728 warn_pwd_expire,
1729 &already_expired);
1730
1731 if (already_expired == true) {
1732
1733 SMB_TIME_T last_set = user_info->pass_last_set_time;
1734
1735 _pam_log_debug(ctx, LOG_DEBUG,
1736 "Password has expired "
1737 "(Password was last set: %lld, "
1738 "the policy says it should expire here "
1739 "%lld (now it's: %lu))\n",
1740 (long long int)last_set,
1741 (long long int)last_set +
1742 policy->expire,
1743 time(NULL));
1744
1745 return PAM_AUTHTOK_EXPIRED;
1746 }
1747
1748 /* inform about logon type */
1749 _pam_warn_logon_type(ctx, user, user_info->user_flags);
1750
1751 /* inform about krb5 failures */
1752 _pam_warn_krb5_failure(ctx, user, user_info->user_flags);
1753
1754 /* set some info3 info for other modules in the stack */
1755 _pam_set_data_info3(ctx, user_info);
1756
1757 /* put krb5ccname into env */
1758 _pam_setup_krb5_env(ctx, info);
1759
1760 /* If winbindd returned a username, return the pointer to it
1761 * here. */
1762 _pam_setup_unix_username(ctx, user_ret, info);
1763 }
1764
1765 done:
1766 if (logon.blobs) {
1767 wbcFreeMemory(logon.blobs);
1768 }
1769 if (info && info->blobs) {
1770 wbcFreeMemory(info->blobs);
1771 }
1772 if (error && !p_error) {
1773 wbcFreeMemory(error);
1774 }
1775 if (info && !p_info) {
1776 wbcFreeMemory(info);
1777 }
1778 if (policy && !p_policy) {
1779 wbcFreeMemory(policy);
1780 }
1781
1782 return ret;
1783 }
1784
1785 /* talk to winbindd */
1786 static int winbind_chauthtok_request(struct pwb_context *ctx,
1787 const char *user,
1788 const char *oldpass,
1789 const char *newpass,
1790 time_t pwd_last_set)
1791 {
1792 wbcErr wbc_status;
1793 struct wbcChangePasswordParams params;
1794 struct wbcAuthErrorInfo *error = NULL;
1795 struct wbcUserPasswordPolicyInfo *policy = NULL;
1796 enum wbcPasswordChangeRejectReason reject_reason = -1;
1797 uint32_t flags = 0;
1798
1799 int i;
1800 const char *codes[] = {
1801 "NT_STATUS_BACKUP_CONTROLLER",
1802 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1803 "NT_STATUS_NO_LOGON_SERVERS",
1804 "NT_STATUS_ACCESS_DENIED",
1805 "NT_STATUS_PWD_TOO_SHORT", /* TODO: tell the min pwd length ? */
1806 "NT_STATUS_PWD_TOO_RECENT", /* TODO: tell the minage ? */
1807 "NT_STATUS_PWD_HISTORY_CONFLICT" /* TODO: tell the history length ? */
1808 };
1809 int ret = PAM_AUTH_ERR;
1810
1811 ZERO_STRUCT(params);
1812
1813 if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1814 flags |= WBFLAG_PAM_KRB5 |
1815 WBFLAG_PAM_CONTACT_TRUSTDOM;
1816 }
1817
1818 if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1819 flags |= WBFLAG_PAM_CACHED_LOGIN;
1820 }
1821
1822 params.account_name = user;
1823 params.level = WBC_AUTH_USER_LEVEL_PLAIN;
1824 params.old_password.plaintext = oldpass;
1825 params.new_password.plaintext = newpass;
1826 params.flags = flags;
1827
1828 wbc_status = wbcChangeUserPasswordEx(&params, &error, &reject_reason, &policy);
1829 ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1830 user, "wbcChangeUserPasswordEx");
1831
1832 if (WBC_ERROR_IS_OK(wbc_status)) {
1833 _pam_log(ctx, LOG_NOTICE,
1834 "user '%s' password changed", user);
1835 return PAM_SUCCESS;
1836 }
1837
1838 if (!error) {
1839 wbcFreeMemory(policy);
1840 return ret;
1841 }
1842
1843 for (i=0; i<ARRAY_SIZE(codes); i++) {
1844 int _ret = ret;
1845 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1846 ret = _ret;
1847 goto done;
1848 }
1849 }
1850
1851 if (!strcasecmp(error->nt_string,
1852 "NT_STATUS_PASSWORD_RESTRICTION")) {
1853
1854 char *pwd_restriction_string = NULL;
1855 SMB_TIME_T min_pwd_age = 0;
1856
1857 if (policy) {
1858 min_pwd_age = policy->min_passwordage;
1859 }
1860
1861 /* FIXME: avoid to send multiple PAM messages after another */
1862 switch (reject_reason) {
1863 case -1:
1864 break;
1865 case WBC_PWD_CHANGE_REJECT_OTHER:
1866 if ((min_pwd_age > 0) &&
1867 (pwd_last_set + min_pwd_age > time(NULL))) {
1868 PAM_WB_REMARK_DIRECT(ctx,
1869 "NT_STATUS_PWD_TOO_RECENT");
1870 }
1871 break;
1872 case WBC_PWD_CHANGE_REJECT_TOO_SHORT:
1873 PAM_WB_REMARK_DIRECT(ctx,
1874 "NT_STATUS_PWD_TOO_SHORT");
1875 break;
1876 case WBC_PWD_CHANGE_REJECT_IN_HISTORY:
1877 PAM_WB_REMARK_DIRECT(ctx,
1878 "NT_STATUS_PWD_HISTORY_CONFLICT");
1879 break;
1880 case WBC_PWD_CHANGE_REJECT_COMPLEXITY:
1881 _make_remark(ctx, PAM_ERROR_MSG,
1882 _("Password does not meet "
1883 "complexity requirements"));
1884 break;
1885 default:
1886 _pam_log_debug(ctx, LOG_DEBUG,
1887 "unknown password change "
1888 "reject reason: %d",
1889 reject_reason);
1890 break;
1891 }
1892
1893 pwd_restriction_string =
1894 _pam_compose_pwd_restriction_string(ctx, policy);
1895 if (pwd_restriction_string) {
1896 _make_remark(ctx, PAM_ERROR_MSG,
1897 pwd_restriction_string);
1898 TALLOC_FREE(pwd_restriction_string);
1899 }
1900 }
1901 done:
1902 wbcFreeMemory(error);
1903 wbcFreeMemory(policy);
1904
1905 return ret;
1906 }
1907
1908 /*
1909 * Checks if a user has an account
1910 *
1911 * return values:
1912 * 1 = User not found
1913 * 0 = OK
1914 * -1 = System error
1915 */
1916 static int valid_user(struct pwb_context *ctx,
1917 const char *user)
1918 {
1919 /* check not only if the user is available over NSS calls, also make
1920 * sure it's really a winbind user, this is important when stacking PAM
1921 * modules in the 'account' or 'password' facility. */
1922
1923 wbcErr wbc_status;
1924 struct passwd *pwd = NULL;
1925 struct passwd *wb_pwd = NULL;
1926
1927 pwd = getpwnam(user);
1928 if (pwd == NULL) {
1929 return 1;
1930 }
1931
1932 wbc_status = wbcGetpwnam(user, &wb_pwd);
1933 wbcFreeMemory(wb_pwd);
1934 if (!WBC_ERROR_IS_OK(wbc_status)) {
1935 _pam_log(ctx, LOG_DEBUG, "valid_user: wbcGetpwnam gave %s\n",
1936 wbcErrorString(wbc_status));
1937 }
1938
1939 switch (wbc_status) {
1940 case WBC_ERR_UNKNOWN_USER:
1941 return 1;
1942 case WBC_ERR_SUCCESS:
1943 return 0;
1944 default:
1945 break;
1946 }
1947 return -1;
1948 }
1949
1950 static char *_pam_delete(register char *xx)
1951 {
1952 _pam_overwrite(xx);
1953 _pam_drop(xx);
1954 return NULL;
1955 }
1956
1957 /*
1958 * obtain a password from the user
1959 */
1960
1961 static int _winbind_read_password(struct pwb_context *ctx,
1962 unsigned int ctrl,
1963 const char *comment,
1964 const char *prompt1,
1965 const char *prompt2,
1966 const char **pass)
1967 {
1968 int authtok_flag;
1969 int retval;
1970 const char *item;
1971 char *token;
1972
1973 _pam_log(ctx, LOG_DEBUG, "getting password (0x%08x)", ctrl);
1974
1975 /*
1976 * make sure nothing inappropriate gets returned
1977 */
1978
1979 *pass = token = NULL;
1980
1981 /*
1982 * which authentication token are we getting?
1983 */
1984
1985 if (on(WINBIND__OLD_PASSWORD, ctrl)) {
1986 authtok_flag = PAM_OLDAUTHTOK;
1987 } else {
1988 authtok_flag = PAM_AUTHTOK;
1989 }
1990
1991 /*
1992 * should we obtain the password from a PAM item ?
1993 */
1994
1995 if (on(WINBIND_TRY_FIRST_PASS_ARG, ctrl) ||
1996 on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
1997 retval = _pam_get_item(ctx->pamh, authtok_flag, &item);
1998 if (retval != PAM_SUCCESS) {
1999 /* very strange. */
2000 _pam_log(ctx, LOG_ALERT,
2001 "pam_get_item returned error "
2002 "to unix-read-password");
2003 return retval;
2004 } else if (item != NULL) { /* we have a password! */
2005 *pass = item;
2006 item = NULL;
2007 _pam_log(ctx, LOG_DEBUG,
2008 "pam_get_item returned a password");
2009 return PAM_SUCCESS;
2010 } else if (on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2011 return PAM_AUTHTOK_RECOVER_ERR; /* didn't work */
2012 } else if (on(WINBIND_USE_AUTHTOK_ARG, ctrl)
2013 && off(WINBIND__OLD_PASSWORD, ctrl)) {
2014 return PAM_AUTHTOK_RECOVER_ERR;
2015 }
2016 }
2017 /*
2018 * getting here implies we will have to get the password from the
2019 * user directly.
2020 */
2021
2022 {
2023 struct pam_message msg[3], *pmsg[3];
2024 struct pam_response *resp;
2025 int i, replies;
2026
2027 /* prepare to converse */
2028
2029 if (comment != NULL && off(ctrl, WINBIND_SILENT)) {
2030 pmsg[0] = &msg[0];
2031 msg[0].msg_style = PAM_TEXT_INFO;
2032 msg[0].msg = discard_const_p(char, comment);
2033 i = 1;
2034 } else {
2035 i = 0;
2036 }
2037
2038 pmsg[i] = &msg[i];
2039 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2040 msg[i++].msg = discard_const_p(char, prompt1);
2041 replies = 1;
2042
2043 if (prompt2 != NULL) {
2044 pmsg[i] = &msg[i];
2045 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2046 msg[i++].msg = discard_const_p(char, prompt2);
2047 ++replies;
2048 }
2049 /* so call the conversation expecting i responses */
2050 resp = NULL;
2051 retval = converse(ctx->pamh, i, pmsg, &resp);
2052 if (resp == NULL) {
2053 if (retval == PAM_SUCCESS) {
2054 retval = PAM_AUTHTOK_RECOVER_ERR;
2055 }
2056 goto done;
2057 }
2058 if (retval != PAM_SUCCESS) {
2059 _pam_drop_reply(resp, i);
2060 goto done;
2061 }
2062
2063 /* interpret the response */
2064
2065 token = x_strdup(resp[i - replies].resp);
2066 if (!token) {
2067 _pam_log(ctx, LOG_NOTICE,
2068 "could not recover "
2069 "authentication token");
2070 retval = PAM_AUTHTOK_RECOVER_ERR;
2071 goto done;
2072 }
2073
2074 if (replies == 2) {
2075 /* verify that password entered correctly */
2076 if (!resp[i - 1].resp ||
2077 strcmp(token, resp[i - 1].resp)) {
2078 _pam_delete(token); /* mistyped */
2079 retval = PAM_AUTHTOK_RECOVER_ERR;
2080 _make_remark(ctx, PAM_ERROR_MSG,
2081 MISTYPED_PASS);
2082 }
2083 }
2084
2085 /*
2086 * tidy up the conversation (resp_retcode) is ignored
2087 * -- what is it for anyway? AGM
2088 */
2089 _pam_drop_reply(resp, i);
2090 }
2091
2092 done:
2093 if (retval != PAM_SUCCESS) {
2094 _pam_log_debug(ctx, LOG_DEBUG,
2095 "unable to obtain a password");
2096 return retval;
2097 }
2098 /* 'token' is the entered password */
2099
2100 /* we store this password as an item */
2101
2102 retval = pam_set_item(ctx->pamh, authtok_flag, token);
2103 _pam_delete(token); /* clean it up */
2104 if (retval != PAM_SUCCESS ||
2105 (retval = _pam_get_item(ctx->pamh, authtok_flag, &item)) != PAM_SUCCESS) {
2106
2107 _pam_log(ctx, LOG_CRIT, "error manipulating password");
2108 return retval;
2109
2110 }
2111
2112 *pass = item;
2113 item = NULL; /* break link to password */
2114
2115 return PAM_SUCCESS;
2116 }
2117
2118 static const char *get_conf_item_string(struct pwb_context *ctx,
2119 const char *item,
2120 int config_flag)
2121 {
2122 int i = 0;
2123 const char *parm_opt = NULL;
2124
2125 if (!(ctx->ctrl & config_flag)) {
2126 goto out;
2127 }
2128
2129 /* let the pam opt take precedence over the pam_winbind.conf option */
2130 for (i=0; i<ctx->argc; i++) {
2131
2132 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2133 char *p;
2134
2135 if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2136 _pam_log(ctx, LOG_INFO,
2137 "no \"=\" delimiter for \"%s\" found\n",
2138 item);
2139 goto out;
2140 }
2141 _pam_log_debug(ctx, LOG_INFO,
2142 "PAM config: %s '%s'\n", item, p+1);
2143 return p + 1;
2144 }
2145 }
2146
2147 if (ctx->dict) {
2148 char *key = NULL;
2149
2150 key = talloc_asprintf(ctx, "global:%s", item);
2151 if (!key) {
2152 goto out;
2153 }
2154
2155 parm_opt = iniparser_getstr(ctx->dict, key);
2156 TALLOC_FREE(key);
2157
2158 _pam_log_debug(ctx, LOG_INFO, "CONFIG file: %s '%s'\n",
2159 item, parm_opt);
2160 }
2161 out:
2162 return parm_opt;
2163 }
2164
2165 static int get_config_item_int(struct pwb_context *ctx,
2166 const char *item,
2167 int config_flag)
2168 {
2169 int i, parm_opt = -1;
2170
2171 if (!(ctx->ctrl & config_flag)) {
2172 goto out;
2173 }
2174
2175 /* let the pam opt take precedence over the pam_winbind.conf option */
2176 for (i = 0; i < ctx->argc; i++) {
2177
2178 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2179 char *p;
2180
2181 if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2182 _pam_log(ctx, LOG_INFO,
2183 "no \"=\" delimiter for \"%s\" found\n",
2184 item);
2185 goto out;
2186 }
2187 parm_opt = atoi(p + 1);
2188 _pam_log_debug(ctx, LOG_INFO,
2189 "PAM config: %s '%d'\n",
2190 item, parm_opt);
2191 return parm_opt;
2192 }
2193 }
2194
2195 if (ctx->dict) {
2196 char *key = NULL;
2197
2198 key = talloc_asprintf(ctx, "global:%s", item);
2199 if (!key) {
2200 goto out;
2201 }
2202
2203 parm_opt = iniparser_getint(ctx->dict, key, -1);
2204 TALLOC_FREE(key);
2205
2206 _pam_log_debug(ctx, LOG_INFO,
2207 "CONFIG file: %s '%d'\n",
2208 item, parm_opt);
2209 }
2210 out:
2211 return parm_opt;
2212 }
2213
2214 static const char *get_krb5_cc_type_from_config(struct pwb_context *ctx)
2215 {
2216 return get_conf_item_string(ctx, "krb5_ccache_type",
2217 WINBIND_KRB5_CCACHE_TYPE);
2218 }
2219
2220 static const char *get_member_from_config(struct pwb_context *ctx)
2221 {
2222 const char *ret = NULL;
2223 ret = get_conf_item_string(ctx, "require_membership_of",
2224 WINBIND_REQUIRED_MEMBERSHIP);
2225 if (ret) {
2226 return ret;
2227 }
2228 return get_conf_item_string(ctx, "require-membership-of",
2229 WINBIND_REQUIRED_MEMBERSHIP);
2230 }
2231
2232 static int get_warn_pwd_expire_from_config(struct pwb_context *ctx)
2233 {
2234 int ret;
2235 ret = get_config_item_int(ctx, "warn_pwd_expire",
2236 WINBIND_WARN_PWD_EXPIRE);
2237 /* no or broken setting */
2238 if (ret <= 0) {
2239 return DEFAULT_DAYS_TO_WARN_BEFORE_PWD_EXPIRES;
2240 }
2241 return ret;
2242 }
2243
2244 /**
2245 * Retrieve the winbind separator.
2246 *
2247 * @param ctx PAM winbind context.
2248 *
2249 * @return string separator character. NULL on failure.
2250 */
2251
2252 static char winbind_get_separator(struct pwb_context *ctx)
2253 {
2254 wbcErr wbc_status;
2255 static struct wbcInterfaceDetails *details = NULL;
2256
2257 wbc_status = wbcInterfaceDetails(&details);
2258 if (!WBC_ERROR_IS_OK(wbc_status)) {
2259 _pam_log(ctx, LOG_ERR,
2260 "Could not retrieve winbind interface details: %s",
2261 wbcErrorString(wbc_status));
2262 return '\0';
2263 }
2264
2265 if (!details) {
2266 return '\0';
2267 }
2268
2269 return details->winbind_separator;
2270 }
2271
2272
2273 /**
2274 * Convert a upn to a name.
2275 *
2276 * @param ctx PAM winbind context.
2277 * @param upn USer UPN to be trabslated.
2278 *
2279 * @return converted name. NULL pointer on failure. Caller needs to free.
2280 */
2281
2282 static char* winbind_upn_to_username(struct pwb_context *ctx,
2283 const char *upn)
2284 {
2285 char sep;
2286 wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;
2287 struct wbcDomainSid sid;
2288 enum wbcSidType type;
2289 char *domain;
2290 char *name;
2291 char *p;
2292
2293 /* This cannot work when the winbind separator = @ */
2294
2295 sep = winbind_get_separator(ctx);
2296 if (!sep || sep == '@') {
2297 return NULL;
2298 }
2299
2300 name = talloc_strdup(ctx, upn);
2301 if (!name) {
2302 return NULL;
2303 }
2304 if ((p = strchr(name, '@')) != NULL) {
2305 *p = 0;
2306 domain = p + 1;
2307 }
2308
2309 /* Convert the UPN to a SID */
2310
2311 wbc_status = wbcLookupName(domain, name, &sid, &type);
2312 if (!WBC_ERROR_IS_OK(wbc_status)) {
2313 return NULL;
2314 }
2315
2316 /* Convert the the SID back to the sAMAccountName */
2317
2318 wbc_status = wbcLookupSid(&sid, &domain, &name, &type);
2319 if (!WBC_ERROR_IS_OK(wbc_status)) {
2320 return NULL;
2321 }
2322
2323 return talloc_asprintf(ctx, "%s\\%s", domain, name);
2324 }
2325
2326 static int _pam_delete_cred(pam_handle_t *pamh, int flags,
2327 int argc, const char **argv)
2328 {
2329 int retval = PAM_SUCCESS;
2330 struct pwb_context *ctx = NULL;
2331 struct wbcLogoffUserParams logoff;
2332 struct wbcAuthErrorInfo *error = NULL;
2333 const char *user;
2334 wbcErr wbc_status = WBC_ERR_SUCCESS;
2335
2336 ZERO_STRUCT(logoff);
2337
2338 retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2339 if (retval) {
2340 goto out;
2341 }
2342
2343 _PAM_LOG_FUNCTION_ENTER("_pam_delete_cred", ctx);
2344
2345 if (ctx->ctrl & WINBIND_KRB5_AUTH) {
2346
2347 /* destroy the ccache here */
2348
2349 uint32_t wbc_flags = 0;
2350 const char *ccname = NULL;
2351 struct passwd *pwd = NULL;
2352
2353 retval = pam_get_user(pamh, &user, _("Username: "));
2354 if (retval) {
2355 _pam_log(ctx, LOG_ERR,
2356 "could not identify user");
2357 goto out;
2358 }
2359
2360 if (user == NULL) {
2361 _pam_log(ctx, LOG_ERR,
2362 "username was NULL!");
2363 retval = PAM_USER_UNKNOWN;
2364 goto out;
2365 }
2366
2367 _pam_log_debug(ctx, LOG_DEBUG,
2368 "username [%s] obtained", user);
2369
2370 ccname = pam_getenv(pamh, "KRB5CCNAME");
2371 if (ccname == NULL) {
2372 _pam_log_debug(ctx, LOG_DEBUG,
2373 "user has no KRB5CCNAME environment");
2374 }
2375
2376 pwd = getpwnam(user);
2377 if (pwd == NULL) {
2378 retval = PAM_USER_UNKNOWN;
2379 goto out;
2380 }
2381
2382 wbc_flags = WBFLAG_PAM_KRB5 |
2383 WBFLAG_PAM_CONTACT_TRUSTDOM;
2384
2385 logoff.username = user;
2386
2387 if (ccname) {
2388 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2389 &logoff.blobs,
2390 "ccfilename",
2391 0,
2392 (uint8_t *)ccname,
2393 strlen(ccname)+1);
2394 if (!WBC_ERROR_IS_OK(wbc_status)) {
2395 goto out;
2396 }
2397 }
2398
2399 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2400 &logoff.blobs,
2401 "flags",
2402 0,
2403 (uint8_t *)&wbc_flags,
2404 sizeof(wbc_flags));
2405 if (!WBC_ERROR_IS_OK(wbc_status)) {
2406 goto out;
2407 }
2408
2409 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2410 &logoff.blobs,
2411 "user_uid",
2412 0,
2413 (uint8_t *)&pwd->pw_uid,
2414 sizeof(pwd->pw_uid));
2415 if (!WBC_ERROR_IS_OK(wbc_status)) {
2416 goto out;
2417 }
2418
2419 wbc_status = wbcLogoffUserEx(&logoff, &error);
2420 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2421 user, "wbcLogoffUser");
2422 wbcFreeMemory(error);
2423 wbcFreeMemory(logoff.blobs);
2424 logoff.blobs = NULL;
2425
2426 if (!WBC_ERROR_IS_OK(wbc_status)) {
2427 _pam_log(ctx, LOG_INFO,
2428 "failed to logoff user %s: %s\n",
2429 user, wbcErrorString(wbc_status));
2430 }
2431 }
2432
2433 out:
2434 if (logoff.blobs) {
2435 wbcFreeMemory(logoff.blobs);
2436 }
2437
2438 if (!WBC_ERROR_IS_OK(wbc_status)) {
2439 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2440 user, "wbcLogoffUser");
2441 }
2442
2443 /*
2444 * Delete the krb5 ccname variable from the PAM environment
2445 * if it was set by winbind.
2446 */
2447 if ((ctx->ctrl & WINBIND_KRB5_AUTH) && pam_getenv(pamh, "KRB5CCNAME")) {
2448 pam_putenv(pamh, "KRB5CCNAME");
2449 }
2450
2451 _PAM_LOG_FUNCTION_LEAVE("_pam_delete_cred", ctx, retval);
2452
2453 TALLOC_FREE(ctx);
2454
2455 return retval;
2456 }
2457
2458 PAM_EXTERN
2459 int pam_sm_authenticate(pam_handle_t *pamh, int flags,
2460 int argc, const char **argv)
2461 {
2462 const char *username;
2463 const char *password;
2464 const char *member = NULL;
2465 const char *cctype = NULL;
2466 int warn_pwd_expire;
2467 int retval = PAM_AUTH_ERR;
2468 char *username_ret = NULL;
2469 char *new_authtok_required = NULL;
2470 char *real_username = NULL;
2471 struct pwb_context *ctx = NULL;
2472
2473 retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2474 if (retval) {
2475 goto out;
2476 }
2477
2478 _PAM_LOG_FUNCTION_ENTER("pam_sm_authenticate", ctx);
2479
2480 /* Get the username */
2481 retval = pam_get_user(pamh, &username, NULL);
2482 if ((retval != PAM_SUCCESS) || (!username)) {
2483 _pam_log_debug(ctx, LOG_DEBUG,
2484 "can not get the username");
2485 retval = PAM_SERVICE_ERR;
2486 goto out;
2487 }
2488
2489
2490 #if defined(AIX)
2491 /* Decode the user name since AIX does not support logn user
2492 names by default. The name is encoded as _#uid. */
2493
2494 if (username[0] == '_') {
2495 uid_t id = atoi(&username[1]);
2496 struct passwd *pw = NULL;
2497
2498 if ((id!=0) && ((pw = getpwuid(id)) != NULL)) {
2499 real_username = strdup(pw->pw_name);
2500 }
2501 }
2502 #endif
2503
2504 if (!real_username) {
2505 /* Just making a copy of the username we got from PAM */
2506 if ((real_username = strdup(username)) == NULL) {
2507 _pam_log_debug(ctx, LOG_DEBUG,
2508 "memory allocation failure when copying "
2509 "username");
2510 retval = PAM_SERVICE_ERR;
2511 goto out;
2512 }
2513 }
2514
2515 /* Maybe this was a UPN */
2516
2517 if (strchr(real_username, '@') != NULL) {
2518 char *samaccountname = NULL;
2519
2520 samaccountname = winbind_upn_to_username(ctx,
2521 real_username);
2522 if (samaccountname) {
2523 free(real_username);
2524 real_username = strdup(samaccountname);
2525 }
2526 }
2527
2528 retval = _winbind_read_password(ctx, ctx->ctrl, NULL,
2529 _("Password: "), NULL,
2530 &password);
2531
2532 if (retval != PAM_SUCCESS) {
2533 _pam_log(ctx, LOG_ERR,
2534 "Could not retrieve user's password");
2535 retval = PAM_AUTHTOK_ERR;
2536 goto out;
2537 }
2538
2539 /* Let's not give too much away in the log file */
2540
2541 #ifdef DEBUG_PASSWORD
2542 _pam_log_debug(ctx, LOG_INFO,
2543 "Verify user '%s' with password '%s'",
2544 real_username, password);
2545 #else
2546 _pam_log_debug(ctx, LOG_INFO,
2547 "Verify user '%s'", real_username);
2548 #endif
2549
2550 member = get_member_from_config(ctx);
2551 cctype = get_krb5_cc_type_from_config(ctx);
2552 warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
2553
2554 /* Now use the username to look up password */
2555 retval = winbind_auth_request(ctx, real_username, password,
2556 member, cctype, warn_pwd_expire,
2557 NULL, NULL, NULL,
2558 NULL, &username_ret);
2559
2560 if (retval == PAM_NEW_AUTHTOK_REQD ||
2561 retval == PAM_AUTHTOK_EXPIRED) {
2562
2563 char *new_authtok_required_during_auth = NULL;
2564
2565 new_authtok_required = talloc_asprintf(NULL, "%d", retval);
2566 if (!new_authtok_required) {
2567 retval = PAM_BUF_ERR;
2568 goto out;
2569 }
2570
2571 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2572 new_authtok_required,
2573 _pam_winbind_cleanup_func);
2574
2575 retval = PAM_SUCCESS;
2576
2577 new_authtok_required_during_auth = talloc_asprintf(NULL, "%d", true);
2578 if (!new_authtok_required_during_auth) {
2579 retval = PAM_BUF_ERR;
2580 goto out;
2581 }
2582
2583 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2584 new_authtok_required_during_auth,
2585 _pam_winbind_cleanup_func);
2586
2587 goto out;
2588 }
2589
2590 out:
2591 if (username_ret) {
2592 pam_set_item (pamh, PAM_USER, username_ret);
2593 _pam_log_debug(ctx, LOG_INFO,
2594 "Returned user was '%s'", username_ret);
2595 free(username_ret);
2596 }
2597
2598 if (real_username) {
2599 free(real_username);
2600 }
2601
2602 if (!new_authtok_required) {
2603 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, NULL, NULL);
2604 }
2605
2606 if (retval != PAM_SUCCESS) {
2607 _pam_free_data_info3(pamh);
2608 }
2609
2610 _PAM_LOG_FUNCTION_LEAVE("pam_sm_authenticate", ctx, retval);
2611
2612 TALLOC_FREE(ctx);
2613
2614 return retval;
2615 }
2616
2617 PAM_EXTERN
2618 int pam_sm_setcred(pam_handle_t *pamh, int flags,
2619 int argc, const char **argv)
2620 {
2621 int ret = PAM_SYSTEM_ERR;
2622 struct pwb_context *ctx = NULL;
2623
2624 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2625 if (ret) {
2626 goto out;
2627 }
2628
2629 _PAM_LOG_FUNCTION_ENTER("pam_sm_setcred", ctx);
2630
2631 switch (flags & ~PAM_SILENT) {
2632
2633 case PAM_DELETE_CRED:
2634 ret = _pam_delete_cred(pamh, flags, argc, argv);
2635 break;
2636 case PAM_REFRESH_CRED:
2637 _pam_log_debug(ctx, LOG_WARNING,
2638 "PAM_REFRESH_CRED not implemented");
2639 ret = PAM_SUCCESS;
2640 break;
2641 case PAM_REINITIALIZE_CRED:
2642 _pam_log_debug(ctx, LOG_WARNING,
2643 "PAM_REINITIALIZE_CRED not implemented");
2644 ret = PAM_SUCCESS;
2645 break;
2646 case PAM_ESTABLISH_CRED:
2647 _pam_log_debug(ctx, LOG_WARNING,
2648 "PAM_ESTABLISH_CRED not implemented");
2649 ret = PAM_SUCCESS;
2650 break;
2651 default:
2652 ret = PAM_SYSTEM_ERR;
2653 break;
2654 }
2655
2656 out:
2657
2658 _PAM_LOG_FUNCTION_LEAVE("pam_sm_setcred", ctx, ret);
2659
2660 TALLOC_FREE(ctx);
2661
2662 return ret;
2663 }
2664
2665 /*
2666 * Account management. We want to verify that the account exists
2667 * before returning PAM_SUCCESS
2668 */
2669 PAM_EXTERN
2670 int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
2671 int argc, const char **argv)
2672 {
2673 const char *username;
2674 int ret = PAM_USER_UNKNOWN;
2675 void *tmp = NULL;
2676 struct pwb_context *ctx = NULL;
2677
2678 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2679 if (ret) {
2680 goto out;
2681 }
2682
2683 _PAM_LOG_FUNCTION_ENTER("pam_sm_acct_mgmt", ctx);
2684
2685
2686 /* Get the username */
2687 ret = pam_get_user(pamh, &username, NULL);
2688 if ((ret != PAM_SUCCESS) || (!username)) {
2689 _pam_log_debug(ctx, LOG_DEBUG,
2690 "can not get the username");
2691 ret = PAM_SERVICE_ERR;
2692 goto out;
2693 }
2694
2695 /* Verify the username */
2696 ret = valid_user(ctx, username);
2697 switch (ret) {
2698 case -1:
2699 /* some sort of system error. The log was already printed */
2700 ret = PAM_SERVICE_ERR;
2701 goto out;
2702 case 1:
2703 /* the user does not exist */
2704 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
2705 username);
2706 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
2707 ret = PAM_IGNORE;
2708 goto out;
2709 }
2710 ret = PAM_USER_UNKNOWN;
2711 goto out;
2712 case 0:
2713 pam_get_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2714 (const void **)&tmp);
2715 if (tmp != NULL) {
2716 ret = atoi((const char *)tmp);
2717 switch (ret) {
2718 case PAM_AUTHTOK_EXPIRED:
2719 /* fall through, since new token is required in this case */
2720 case PAM_NEW_AUTHTOK_REQD:
2721 _pam_log(ctx, LOG_WARNING,
2722 "pam_sm_acct_mgmt success but %s is set",
2723 PAM_WINBIND_NEW_AUTHTOK_REQD);
2724 _pam_log(ctx, LOG_NOTICE,
2725 "user '%s' needs new password",
2726 username);
2727 /* PAM_AUTHTOKEN_REQD does not exist, but is documented in the manpage */
2728 ret = PAM_NEW_AUTHTOK_REQD;
2729 goto out;
2730 default:
2731 _pam_log(ctx, LOG_WARNING,
2732 "pam_sm_acct_mgmt success");
2733 _pam_log(ctx, LOG_NOTICE,
2734 "user '%s' granted access", username);
2735 ret = PAM_SUCCESS;
2736 goto out;
2737 }
2738 }
2739
2740 /* Otherwise, the authentication looked good */
2741 _pam_log(ctx, LOG_NOTICE,
2742 "user '%s' granted access", username);
2743 ret = PAM_SUCCESS;
2744 goto out;
2745 default:
2746 /* we don't know anything about this return value */
2747 _pam_log(ctx, LOG_ERR,
2748 "internal module error (ret = %d, user = '%s')",
2749 ret, username);
2750 ret = PAM_SERVICE_ERR;
2751 goto out;
2752 }
2753
2754 /* should not be reached */
2755 ret = PAM_IGNORE;
2756
2757 out:
2758
2759 _PAM_LOG_FUNCTION_LEAVE("pam_sm_acct_mgmt", ctx, ret);
2760
2761 TALLOC_FREE(ctx);
2762
2763 return ret;
2764 }
2765
2766 PAM_EXTERN
2767 int pam_sm_open_session(pam_handle_t *pamh, int flags,
2768 int argc, const char **argv)
2769 {
2770 int ret = PAM_SUCCESS;
2771 struct pwb_context *ctx = NULL;
2772
2773 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2774 if (ret) {
2775 goto out;
2776 }
2777
2778 _PAM_LOG_FUNCTION_ENTER("pam_sm_open_session", ctx);
2779
2780 if (ctx->ctrl & WINBIND_MKHOMEDIR) {
2781 /* check and create homedir */
2782 ret = _pam_mkhomedir(ctx);
2783 }
2784 out:
2785 _PAM_LOG_FUNCTION_LEAVE("pam_sm_open_session", ctx, ret);
2786
2787 TALLOC_FREE(ctx);
2788
2789 return ret;
2790 }
2791
2792 PAM_EXTERN
2793 int pam_sm_close_session(pam_handle_t *pamh, int flags,
2794 int argc, const char **argv)
2795 {
2796 int ret = PAM_SUCCESS;
2797 struct pwb_context *ctx = NULL;
2798
2799 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2800 if (ret) {
2801 goto out;
2802 }
2803
2804 _PAM_LOG_FUNCTION_ENTER("pam_sm_close_session", ctx);
2805
2806 out:
2807 _PAM_LOG_FUNCTION_LEAVE("pam_sm_close_session", ctx, ret);
2808
2809 TALLOC_FREE(ctx);
2810
2811 return ret;
2812 }
2813
2814 /**
2815 * evaluate whether we need to re-authenticate with kerberos after a
2816 * password change
2817 *
2818 * @param ctx PAM winbind context.
2819 * @param user The username
2820 *
2821 * @return boolean Returns true if required, false if not.
2822 */
2823
2824 static bool _pam_require_krb5_auth_after_chauthtok(struct pwb_context *ctx,
2825 const char *user)
2826 {
2827
2828 /* Make sure that we only do this if a) the chauthtok got initiated
2829 * during a logon attempt (authenticate->acct_mgmt->chauthtok) b) any
2830 * later password change via the "passwd" command if done by the user
2831 * itself
2832 * NB. If we login from gdm or xdm and the password expires,
2833 * we change the password, but there is no memory cache.
2834 * Thus, even for passthrough login, we should do the
2835 * authentication again to update memory cache.
2836 * --- BoYang
2837 * */
2838
2839 char *new_authtok_reqd_during_auth = NULL;
2840 struct passwd *pwd = NULL;
2841
2842 _pam_get_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2843 &new_authtok_reqd_during_auth);
2844 pam_set_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2845 NULL, NULL);
2846
2847 if (new_authtok_reqd_during_auth) {
2848 return true;
2849 }
2850
2851 pwd = getpwnam(user);
2852 if (!pwd) {
2853 return false;
2854 }
2855
2856 if (getuid() == pwd->pw_uid) {
2857 return true;
2858 }
2859
2860 return false;
2861 }
2862
2863
2864 PAM_EXTERN
2865 int pam_sm_chauthtok(pam_handle_t * pamh, int flags,
2866 int argc, const char **argv)
2867 {
2868 unsigned int lctrl;
2869 int ret;
2870 bool cached_login = false;
2871
2872 /* <DO NOT free() THESE> */
2873 const char *user;
2874 char *pass_old, *pass_new;
2875 /* </DO NOT free() THESE> */
2876
2877 char *Announce;
2878
2879 int retry = 0;
2880 char *username_ret = NULL;
2881 struct wbcAuthErrorInfo *error = NULL;
2882 struct pwb_context *ctx = NULL;
2883
2884 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2885 if (ret) {
2886 goto out;
2887 }
2888
2889 _PAM_LOG_FUNCTION_ENTER("pam_sm_chauthtok", ctx);
2890
2891 cached_login = (ctx->ctrl & WINBIND_CACHED_LOGIN);
2892
2893 /* clearing offline bit for auth */
2894 ctx->ctrl &= ~WINBIND_CACHED_LOGIN;
2895
2896 /*
2897 * First get the name of a user
2898 */
2899 ret = pam_get_user(pamh, &user, _("Username: "));
2900 if (ret) {
2901 _pam_log(ctx, LOG_ERR,
2902 "password - could not identify user");
2903 goto out;
2904 }
2905
2906 if (user == NULL) {
2907 _pam_log(ctx, LOG_ERR, "username was NULL!");
2908 ret = PAM_USER_UNKNOWN;
2909 goto out;
2910 }
2911
2912 _pam_log_debug(ctx, LOG_DEBUG, "username [%s] obtained", user);
2913
2914 /* check if this is really a user in winbindd, not only in NSS */
2915 ret = valid_user(ctx, user);
2916 switch (ret) {
2917 case 1:
2918 ret = PAM_USER_UNKNOWN;
2919 goto out;
2920 case -1:
2921 ret = PAM_SYSTEM_ERR;
2922 goto out;
2923 default:
2924 break;
2925 }
2926
2927 /*
2928 * obtain and verify the current password (OLDAUTHTOK) for
2929 * the user.
2930 */
2931
2932 if (flags & PAM_PRELIM_CHECK) {
2933 time_t pwdlastset_prelim = 0;
2934
2935 /* instruct user what is happening */
2936
2937 #define greeting _("Changing password for")
2938 Announce = talloc_asprintf(ctx, "%s %s", greeting, user);
2939 if (!Announce) {
2940 _pam_log(ctx, LOG_CRIT,
2941 "password - out of memory");
2942 ret = PAM_BUF_ERR;
2943 goto out;
2944 }
2945 #undef greeting
2946
2947 lctrl = ctx->ctrl | WINBIND__OLD_PASSWORD;
2948 ret = _winbind_read_password(ctx, lctrl,
2949 Announce,
2950 _("(current) NT password: "),
2951 NULL,
2952 (const char **) &pass_old);
2953 TALLOC_FREE(Announce);
2954 if (ret != PAM_SUCCESS) {
2955 _pam_log(ctx, LOG_NOTICE,
2956 "password - (old) token not obtained");
2957 goto out;
2958 }
2959
2960 /* verify that this is the password for this user */
2961
2962 ret = winbind_auth_request(ctx, user, pass_old,
2963 NULL, NULL, 0,
2964 &error, NULL, NULL,
2965 &pwdlastset_prelim, NULL);
2966
2967 if (ret != PAM_ACCT_EXPIRED &&
2968 ret != PAM_AUTHTOK_EXPIRED &&
2969 ret != PAM_NEW_AUTHTOK_REQD &&
2970 ret != PAM_SUCCESS) {
2971 pass_old = NULL;
2972 goto out;
2973 }
2974
2975 pam_set_data(pamh, PAM_WINBIND_PWD_LAST_SET,
2976 (void *)pwdlastset_prelim, NULL);
2977
2978 ret = pam_set_item(pamh, PAM_OLDAUTHTOK,
2979 (const void *) pass_old);
2980 pass_old = NULL;
2981 if (ret != PAM_SUCCESS) {
2982 _pam_log(ctx, LOG_CRIT,
2983 "failed to set PAM_OLDAUTHTOK");
2984 }
2985 } else if (flags & PAM_UPDATE_AUTHTOK) {
2986
2987 time_t pwdlastset_update = 0;
2988
2989 /*
2990 * obtain the proposed password
2991 */
2992
2993 /*
2994 * get the old token back.
2995 */
2996
2997 ret = _pam_get_item(pamh, PAM_OLDAUTHTOK, &pass_old);
2998
2999 if (ret != PAM_SUCCESS) {
3000 _pam_log(ctx, LOG_NOTICE,
3001 "user not authenticated");
3002 goto out;
3003 }
3004
3005 lctrl = ctx->ctrl & ~WINBIND_TRY_FIRST_PASS_ARG;
3006
3007 if (on(WINBIND_USE_AUTHTOK_ARG, lctrl)) {
3008 lctrl |= WINBIND_USE_FIRST_PASS_ARG;
3009 }
3010 retry = 0;
3011 ret = PAM_AUTHTOK_ERR;
3012 while ((ret != PAM_SUCCESS) && (retry++ < MAX_PASSWD_TRIES)) {
3013 /*
3014 * use_authtok is to force the use of a previously entered
3015 * password -- needed for pluggable password strength checking
3016 */
3017
3018 ret = _winbind_read_password(ctx, lctrl,
3019 NULL,
3020 _("Enter new NT password: "),
3021 _("Retype new NT password: "),
3022 (const char **)&pass_new);
3023
3024 if (ret != PAM_SUCCESS) {
3025 _pam_log_debug(ctx, LOG_ALERT,
3026 "password - "
3027 "new password not obtained");
3028 pass_old = NULL;/* tidy up */
3029 goto out;
3030 }
3031
3032 /*
3033 * At this point we know who the user is and what they
3034 * propose as their new password. Verify that the new
3035 * password is acceptable.
3036 */
3037
3038 if (pass_new[0] == '\0') {/* "\0" password = NULL */
3039 pass_new = NULL;
3040 }
3041 }
3042
3043 /*
3044 * By reaching here we have approved the passwords and must now
3045 * rebuild the password database file.
3046 */
3047 _pam_get_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3048 &pwdlastset_update);
3049
3050 /*
3051 * if cached creds were enabled, make sure to set the
3052 * WINBIND_CACHED_LOGIN bit here in order to have winbindd
3053 * update the cached creds storage - gd
3054 */
3055 if (cached_login) {
3056 ctx->ctrl |= WINBIND_CACHED_LOGIN;
3057 }
3058
3059 ret = winbind_chauthtok_request(ctx, user, pass_old,
3060 pass_new, pwdlastset_update);
3061 if (ret) {
3062 pass_old = pass_new = NULL;
3063 goto out;
3064 }
3065
3066 if (_pam_require_krb5_auth_after_chauthtok(ctx, user)) {
3067
3068 const char *member = NULL;
3069 const char *cctype = NULL;
3070 int warn_pwd_expire;
3071 struct wbcLogonUserInfo *info = NULL;
3072 struct wbcUserPasswordPolicyInfo *policy = NULL;
3073
3074 member = get_member_from_config(ctx);
3075 cctype = get_krb5_cc_type_from_config(ctx);
3076 warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
3077
3078 /* Keep WINBIND_CACHED_LOGIN bit for
3079 * authentication after changing the password.
3080 * This will update the cached credentials in case
3081 * that winbindd_dual_pam_chauthtok() fails
3082 * to update them.
3083 * --- BoYang
3084 * */
3085
3086 ret = winbind_auth_request(ctx, user, pass_new,
3087 member, cctype, 0,
3088 &error, &info, &policy,
3089 NULL, &username_ret);
3090 pass_old = pass_new = NULL;
3091
3092 if (ret == PAM_SUCCESS) {
3093
3094 struct wbcAuthUserInfo *user_info = NULL;
3095
3096 if (info && info->info) {
3097 user_info = info->info;
3098 }
3099
3100 /* warn a user if the password is about to
3101 * expire soon */
3102 _pam_warn_password_expiry(ctx, user_info, policy,
3103 warn_pwd_expire,
3104 NULL);
3105
3106 /* set some info3 info for other modules in the
3107 * stack */
3108 _pam_set_data_info3(ctx, user_info);
3109
3110 /* put krb5ccname into env */
3111 _pam_setup_krb5_env(ctx, info);
3112
3113 if (username_ret) {
3114 pam_set_item(pamh, PAM_USER,
3115 username_ret);
3116 _pam_log_debug(ctx, LOG_INFO,
3117 "Returned user was '%s'",
3118 username_ret);
3119 free(username_ret);
3120 }
3121
3122 wbcFreeMemory(info);
3123 wbcFreeMemory(policy);
3124 }
3125
3126 goto out;
3127 }
3128 } else {
3129 ret = PAM_SERVICE_ERR;
3130 }
3131
3132 out:
3133 {
3134 /* Deal with offline errors. */
3135 int i;
3136 const char *codes[] = {
3137 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
3138 "NT_STATUS_NO_LOGON_SERVERS",
3139 "NT_STATUS_ACCESS_DENIED"
3140 };
3141
3142 for (i=0; i<ARRAY_SIZE(codes); i++) {
3143 int _ret;
3144 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
3145 break;
3146 }
3147 }
3148 }
3149
3150 wbcFreeMemory(error);
3151
3152 _PAM_LOG_FUNCTION_LEAVE("pam_sm_chauthtok", ctx, ret);
3153
3154 TALLOC_FREE(ctx);
3155
3156 return ret;
3157 }
3158
3159 #ifdef PAM_STATIC
3160
3161 /* static module data */
3162
3163 struct pam_module _pam_winbind_modstruct = {
3164 MODULE_NAME,
3165 pam_sm_authenticate,
3166 pam_sm_setcred,
3167 pam_sm_acct_mgmt,
3168 pam_sm_open_session,
3169 pam_sm_close_session,
3170 pam_sm_chauthtok
3171 };
3172
3173 #endif
3174
3175 /*
3176 * Copyright (c) Andrew Tridgell <tridge@samba.org> 2000
3177 * Copyright (c) Tim Potter <tpot@samba.org> 2000
3178 * Copyright (c) Andrew Bartlettt <abartlet@samba.org> 2002
3179 * Copyright (c) Guenther Deschner <gd@samba.org> 2005-2008
3180 * Copyright (c) Jan Rêkorajski 1999.
3181 * Copyright (c) Andrew G. Morgan 1996-8.
3182 * Copyright (c) Alex O. Yuriev, 1996.
3183 * Copyright (c) Cristian Gafton 1996.
3184 * Copyright (C) Elliot Lee <sopwith@redhat.com> 1996, Red Hat Software.
3185 *
3186 * Redistribution and use in source and binary forms, with or without
3187 * modification, are permitted provided that the following conditions
3188 * are met:
3189 * 1. Redistributions of source code must retain the above copyright
3190 * notice, and the entire permission notice in its entirety,
3191 * including the disclaimer of warranties.
3192 * 2. Redistributions in binary form must reproduce the above copyright
3193 * notice, this list of conditions and the following disclaimer in the
3194 * documentation and/or other materials provided with the distribution.
3195 * 3. The name of the author may not be used to endorse or promote
3196 * products derived from this software without specific prior
3197 * written permission.
3198 *
3199 * ALTERNATIVELY, this product may be distributed under the terms of
3200 * the GNU Public License, in which case the provisions of the GPL are
3201 * required INSTEAD OF the above restrictions. (This clause is
3202 * necessary due to a potential bad interaction between the GPL and
3203 * the restrictions contained in a BSD-style copyright.)
3204 *
3205 * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
3206 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
3207 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
3208 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
3209 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
3210 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
3211 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
3212 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
3213 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
3214 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
3215 * OF THE POSSIBILITY OF SUCH DAMAGE.
3216 */
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