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Replace short-lived NULL talloc contexts with talloc_tos().
[Samba/aatanasov.git] / nsswitch / pam_winbind.c
blobe90f1b75ad63973e1dcca996ef97b30cc78f5727
1 /* pam_winbind module
2
3 Copyright Andrew Tridgell <tridge@samba.org> 2000
4 Copyright Tim Potter <tpot@samba.org> 2000
5 Copyright Andrew Bartlett <abartlet@samba.org> 2002
6 Copyright Guenther Deschner <gd@samba.org> 2005-2008
7
8 largely based on pam_userdb by Cristian Gafton <gafton@redhat.com> also
9 contains large slabs of code from pam_unix by Elliot Lee
10 <sopwith@redhat.com> (see copyright below for full details)
11 */
12
13 #include "pam_winbind.h"
14
15 static int wbc_error_to_pam_error(wbcErr status)
16 {
17 switch (status) {
18 case WBC_ERR_SUCCESS:
19 return PAM_SUCCESS;
20 case WBC_ERR_NOT_IMPLEMENTED:
21 return PAM_SERVICE_ERR;
22 case WBC_ERR_UNKNOWN_FAILURE:
23 break;
24 case WBC_ERR_NO_MEMORY:
25 return PAM_BUF_ERR;
26 case WBC_ERR_INVALID_SID:
27 case WBC_ERR_INVALID_PARAM:
28 break;
29 case WBC_ERR_WINBIND_NOT_AVAILABLE:
30 return PAM_AUTHINFO_UNAVAIL;
31 case WBC_ERR_DOMAIN_NOT_FOUND:
32 return PAM_AUTHINFO_UNAVAIL;
33 case WBC_ERR_INVALID_RESPONSE:
34 return PAM_BUF_ERR;
35 case WBC_ERR_NSS_ERROR:
36 return PAM_USER_UNKNOWN;
37 case WBC_ERR_AUTH_ERROR:
38 return PAM_AUTH_ERR;
39 case WBC_ERR_UNKNOWN_USER:
40 return PAM_USER_UNKNOWN;
41 case WBC_ERR_UNKNOWN_GROUP:
42 return PAM_USER_UNKNOWN;
43 case WBC_ERR_PWD_CHANGE_FAILED:
44 break;
45 }
46
47 /* be paranoid */
48 return PAM_AUTH_ERR;
49 }
50
51 static const char *_pam_error_code_str(int err)
52 {
53 switch (err) {
54 case PAM_SUCCESS:
55 return "PAM_SUCCESS";
56 case PAM_OPEN_ERR:
57 return "PAM_OPEN_ERR";
58 case PAM_SYMBOL_ERR:
59 return "PAM_SYMBOL_ERR";
60 case PAM_SERVICE_ERR:
61 return "PAM_SERVICE_ERR";
62 case PAM_SYSTEM_ERR:
63 return "PAM_SYSTEM_ERR";
64 case PAM_BUF_ERR:
65 return "PAM_BUF_ERR";
66 case PAM_PERM_DENIED:
67 return "PAM_PERM_DENIED";
68 case PAM_AUTH_ERR:
69 return "PAM_AUTH_ERR";
70 case PAM_CRED_INSUFFICIENT:
71 return "PAM_CRED_INSUFFICIENT";
72 case PAM_AUTHINFO_UNAVAIL:
73 return "PAM_AUTHINFO_UNAVAIL";
74 case PAM_USER_UNKNOWN:
75 return "PAM_USER_UNKNOWN";
76 case PAM_MAXTRIES:
77 return "PAM_MAXTRIES";
78 case PAM_NEW_AUTHTOK_REQD:
79 return "PAM_NEW_AUTHTOK_REQD";
80 case PAM_ACCT_EXPIRED:
81 return "PAM_ACCT_EXPIRED";
82 case PAM_SESSION_ERR:
83 return "PAM_SESSION_ERR";
84 case PAM_CRED_UNAVAIL:
85 return "PAM_CRED_UNAVAIL";
86 case PAM_CRED_EXPIRED:
87 return "PAM_CRED_EXPIRED";
88 case PAM_CRED_ERR:
89 return "PAM_CRED_ERR";
90 case PAM_NO_MODULE_DATA:
91 return "PAM_NO_MODULE_DATA";
92 case PAM_CONV_ERR:
93 return "PAM_CONV_ERR";
94 case PAM_AUTHTOK_ERR:
95 return "PAM_AUTHTOK_ERR";
96 case PAM_AUTHTOK_RECOVER_ERR:
97 return "PAM_AUTHTOK_RECOVER_ERR";
98 case PAM_AUTHTOK_LOCK_BUSY:
99 return "PAM_AUTHTOK_LOCK_BUSY";
100 case PAM_AUTHTOK_DISABLE_AGING:
101 return "PAM_AUTHTOK_DISABLE_AGING";
102 case PAM_TRY_AGAIN:
103 return "PAM_TRY_AGAIN";
104 case PAM_IGNORE:
105 return "PAM_IGNORE";
106 case PAM_ABORT:
107 return "PAM_ABORT";
108 case PAM_AUTHTOK_EXPIRED:
109 return "PAM_AUTHTOK_EXPIRED";
110 #ifdef PAM_MODULE_UNKNOWN
111 case PAM_MODULE_UNKNOWN:
112 return "PAM_MODULE_UNKNOWN";
113 #endif
114 #ifdef PAM_BAD_ITEM
115 case PAM_BAD_ITEM:
116 return "PAM_BAD_ITEM";
117 #endif
118 #ifdef PAM_CONV_AGAIN
119 case PAM_CONV_AGAIN:
120 return "PAM_CONV_AGAIN";
121 #endif
122 #ifdef PAM_INCOMPLETE
123 case PAM_INCOMPLETE:
124 return "PAM_INCOMPLETE";
125 #endif
126 default:
127 return NULL;
128 }
129 }
130
131 #define _PAM_LOG_FUNCTION_ENTER(function, ctx) \
132 do { \
133 _pam_log_debug(ctx, LOG_DEBUG, "[pamh: %p] ENTER: " \
134 function " (flags: 0x%04x)", ctx->pamh, ctx->flags); \
135 _pam_log_state(ctx); \
136 } while (0)
137
138 #define _PAM_LOG_FUNCTION_LEAVE(function, ctx, retval) \
139 do { \
140 _pam_log_debug(ctx, LOG_DEBUG, "[pamh: %p] LEAVE: " \
141 function " returning %d (%s)", ctx->pamh, retval, \
142 _pam_error_code_str(retval)); \
143 _pam_log_state(ctx); \
144 } while (0)
145
146 /* data tokens */
147
148 #define MAX_PASSWD_TRIES 3
149
150 #ifdef HAVE_GETTEXT
151 static char initialized = 0;
152
153 static inline void textdomain_init(void);
154 static inline void textdomain_init(void)
155 {
156 if (!initialized) {
157 bindtextdomain(MODULE_NAME, dyn_LOCALEDIR);
158 initialized = 1;
159 }
160 return;
161 }
162 #endif
163
164
165 /*
166 * Work around the pam API that has functions with void ** as parameters
167 * These lead to strict aliasing warnings with gcc.
168 */
169 static int _pam_get_item(const pam_handle_t *pamh,
170 int item_type,
171 const void *_item)
172 {
173 const void **item = (const void **)_item;
174 return pam_get_item(pamh, item_type, item);
175 }
176 static int _pam_get_data(const pam_handle_t *pamh,
177 const char *module_data_name,
178 const void *_data)
179 {
180 const void **data = (const void **)_data;
181 return pam_get_data(pamh, module_data_name, data);
182 }
183
184 /* some syslogging */
185
186 #ifdef HAVE_PAM_VSYSLOG
187 static void _pam_log_int(const pam_handle_t *pamh,
188 int err,
189 const char *format,
190 va_list args)
191 {
192 pam_vsyslog(pamh, err, format, args);
193 }
194 #else
195 static void _pam_log_int(const pam_handle_t *pamh,
196 int err,
197 const char *format,
198 va_list args)
199 {
200 char *format2 = NULL;
201 const char *service;
202
203 _pam_get_item(pamh, PAM_SERVICE, &service);
204
205 format2 = (char *)malloc(strlen(MODULE_NAME)+strlen(format)+strlen(service)+5);
206 if (format2 == NULL) {
207 /* what else todo ? */
208 vsyslog(err, format, args);
209 return;
210 }
211
212 sprintf(format2, "%s(%s): %s", MODULE_NAME, service, format);
213 vsyslog(err, format2, args);
214 SAFE_FREE(format2);
215 }
216 #endif /* HAVE_PAM_VSYSLOG */
217
218 static bool _pam_log_is_silent(int ctrl)
219 {
220 return on(ctrl, WINBIND_SILENT);
221 }
222
223 static void _pam_log(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
224 static void _pam_log(struct pwb_context *r, int err, const char *format, ...)
225 {
226 va_list args;
227
228 if (_pam_log_is_silent(r->ctrl)) {
229 return;
230 }
231
232 va_start(args, format);
233 _pam_log_int(r->pamh, err, format, args);
234 va_end(args);
235 }
236 static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
237 static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
238 {
239 va_list args;
240
241 if (_pam_log_is_silent(ctrl)) {
242 return;
243 }
244
245 va_start(args, format);
246 _pam_log_int(pamh, err, format, args);
247 va_end(args);
248 }
249
250 static bool _pam_log_is_debug_enabled(int ctrl)
251 {
252 if (ctrl == -1) {
253 return false;
254 }
255
256 if (_pam_log_is_silent(ctrl)) {
257 return false;
258 }
259
260 if (!(ctrl & WINBIND_DEBUG_ARG)) {
261 return false;
262 }
263
264 return true;
265 }
266
267 static bool _pam_log_is_debug_state_enabled(int ctrl)
268 {
269 if (!(ctrl & WINBIND_DEBUG_STATE)) {
270 return false;
271 }
272
273 return _pam_log_is_debug_enabled(ctrl);
274 }
275
276 static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
277 static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...)
278 {
279 va_list args;
280
281 if (!_pam_log_is_debug_enabled(r->ctrl)) {
282 return;
283 }
284
285 va_start(args, format);
286 _pam_log_int(r->pamh, err, format, args);
287 va_end(args);
288 }
289 static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
290 static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
291 {
292 va_list args;
293
294 if (!_pam_log_is_debug_enabled(ctrl)) {
295 return;
296 }
297
298 va_start(args, format);
299 _pam_log_int(pamh, err, format, args);
300 va_end(args);
301 }
302
303 static void _pam_log_state_datum(struct pwb_context *ctx,
304 int item_type,
305 const char *key,
306 int is_string)
307 {
308 const void *data = NULL;
309 if (item_type != 0) {
310 pam_get_item(ctx->pamh, item_type, &data);
311 } else {
312 pam_get_data(ctx->pamh, key, &data);
313 }
314 if (data != NULL) {
315 const char *type = (item_type != 0) ? "ITEM" : "DATA";
316 if (is_string != 0) {
317 _pam_log_debug(ctx, LOG_DEBUG,
318 "[pamh: %p] STATE: %s(%s) = \"%s\" (%p)",
319 ctx->pamh, type, key, (const char *)data,
320 data);
321 } else {
322 _pam_log_debug(ctx, LOG_DEBUG,
323 "[pamh: %p] STATE: %s(%s) = %p",
324 ctx->pamh, type, key, data);
325 }
326 }
327 }
328
329 #define _PAM_LOG_STATE_DATA_POINTER(ctx, module_data_name) \
330 _pam_log_state_datum(ctx, 0, module_data_name, 0)
331
332 #define _PAM_LOG_STATE_DATA_STRING(ctx, module_data_name) \
333 _pam_log_state_datum(ctx, 0, module_data_name, 1)
334
335 #define _PAM_LOG_STATE_ITEM_POINTER(ctx, item_type) \
336 _pam_log_state_datum(ctx, item_type, #item_type, 0)
337
338 #define _PAM_LOG_STATE_ITEM_STRING(ctx, item_type) \
339 _pam_log_state_datum(ctx, item_type, #item_type, 1)
340
341 #ifdef DEBUG_PASSWORD
342 #define _LOG_PASSWORD_AS_STRING 1
343 #else
344 #define _LOG_PASSWORD_AS_STRING 0
345 #endif
346
347 #define _PAM_LOG_STATE_ITEM_PASSWORD(ctx, item_type) \
348 _pam_log_state_datum(ctx, item_type, #item_type, \
349 _LOG_PASSWORD_AS_STRING)
350
351 static void _pam_log_state(struct pwb_context *ctx)
352 {
353 if (!_pam_log_is_debug_state_enabled(ctx->ctrl)) {
354 return;
355 }
356
357 _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_SERVICE);
358 _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER);
359 _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_TTY);
360 _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RHOST);
361 _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RUSER);
362 _PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_OLDAUTHTOK);
363 _PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_AUTHTOK);
364 _PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER_PROMPT);
365 _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_CONV);
366 #ifdef PAM_FAIL_DELAY
367 _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_FAIL_DELAY);
368 #endif
369 #ifdef PAM_REPOSITORY
370 _PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_REPOSITORY);
371 #endif
372
373 _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_HOMEDIR);
374 _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSCRIPT);
375 _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSERVER);
376 _PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_PROFILEPATH);
377 _PAM_LOG_STATE_DATA_STRING(ctx,
378 PAM_WINBIND_NEW_AUTHTOK_REQD);
379 /* Use atoi to get PAM result code */
380 _PAM_LOG_STATE_DATA_STRING(ctx,
381 PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH);
382 _PAM_LOG_STATE_DATA_POINTER(ctx, PAM_WINBIND_PWD_LAST_SET);
383 }
384
385 static int _pam_parse(const pam_handle_t *pamh,
386 int flags,
387 int argc,
388 const char **argv,
389 dictionary **result_d)
390 {
391 int ctrl = 0;
392 const char *config_file = NULL;
393 int i;
394 const char **v;
395 dictionary *d = NULL;
396
397 if (flags & PAM_SILENT) {
398 ctrl |= WINBIND_SILENT;
399 }
400
401 for (i=argc,v=argv; i-- > 0; ++v) {
402 if (!strncasecmp(*v, "config", strlen("config"))) {
403 ctrl |= WINBIND_CONFIG_FILE;
404 config_file = v[i];
405 break;
406 }
407 }
408
409 if (config_file == NULL) {
410 config_file = PAM_WINBIND_CONFIG_FILE;
411 }
412
413 d = iniparser_load(config_file);
414 if (d == NULL) {
415 goto config_from_pam;
416 }
417
418 if (iniparser_getboolean(d, "global:debug", false)) {
419 ctrl |= WINBIND_DEBUG_ARG;
420 }
421
422 if (iniparser_getboolean(d, "global:debug_state", false)) {
423 ctrl |= WINBIND_DEBUG_STATE;
424 }
425
426 if (iniparser_getboolean(d, "global:cached_login", false)) {
427 ctrl |= WINBIND_CACHED_LOGIN;
428 }
429
430 if (iniparser_getboolean(d, "global:krb5_auth", false)) {
431 ctrl |= WINBIND_KRB5_AUTH;
432 }
433
434 if (iniparser_getboolean(d, "global:silent", false)) {
435 ctrl |= WINBIND_SILENT;
436 }
437
438 if (iniparser_getstr(d, "global:krb5_ccache_type") != NULL) {
439 ctrl |= WINBIND_KRB5_CCACHE_TYPE;
440 }
441
442 if ((iniparser_getstr(d, "global:require-membership-of") != NULL) ||
443 (iniparser_getstr(d, "global:require_membership_of") != NULL)) {
444 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
445 }
446
447 if (iniparser_getboolean(d, "global:try_first_pass", false)) {
448 ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
449 }
450
451 if (iniparser_getint(d, "global:warn_pwd_expire", 0)) {
452 ctrl |= WINBIND_WARN_PWD_EXPIRE;
453 }
454
455 if (iniparser_getboolean(d, "global:mkhomedir", false)) {
456 ctrl |= WINBIND_MKHOMEDIR;
457 }
458
459 config_from_pam:
460 /* step through arguments */
461 for (i=argc,v=argv; i-- > 0; ++v) {
462
463 /* generic options */
464 if (!strcmp(*v,"debug"))
465 ctrl |= WINBIND_DEBUG_ARG;
466 else if (!strcasecmp(*v, "debug_state"))
467 ctrl |= WINBIND_DEBUG_STATE;
468 else if (!strcasecmp(*v, "silent"))
469 ctrl |= WINBIND_SILENT;
470 else if (!strcasecmp(*v, "use_authtok"))
471 ctrl |= WINBIND_USE_AUTHTOK_ARG;
472 else if (!strcasecmp(*v, "use_first_pass"))
473 ctrl |= WINBIND_USE_FIRST_PASS_ARG;
474 else if (!strcasecmp(*v, "try_first_pass"))
475 ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
476 else if (!strcasecmp(*v, "unknown_ok"))
477 ctrl |= WINBIND_UNKNOWN_OK_ARG;
478 else if (!strncasecmp(*v, "require_membership_of",
479 strlen("require_membership_of")))
480 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
481 else if (!strncasecmp(*v, "require-membership-of",
482 strlen("require-membership-of")))
483 ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
484 else if (!strcasecmp(*v, "krb5_auth"))
485 ctrl |= WINBIND_KRB5_AUTH;
486 else if (!strncasecmp(*v, "krb5_ccache_type",
487 strlen("krb5_ccache_type")))
488 ctrl |= WINBIND_KRB5_CCACHE_TYPE;
489 else if (!strcasecmp(*v, "cached_login"))
490 ctrl |= WINBIND_CACHED_LOGIN;
491 else if (!strcasecmp(*v, "mkhomedir"))
492 ctrl |= WINBIND_MKHOMEDIR;
493 else {
494 __pam_log(pamh, ctrl, LOG_ERR,
495 "pam_parse: unknown option: %s", *v);
496 return -1;
497 }
498
499 }
500
501 if (result_d) {
502 *result_d = d;
503 } else {
504 if (d) {
505 iniparser_freedict(d);
506 }
507 }
508
509 return ctrl;
510 };
511
512 static int _pam_winbind_free_context(struct pwb_context *ctx)
513 {
514 if (!ctx) {
515 return 0;
516 }
517
518 if (ctx->dict) {
519 iniparser_freedict(ctx->dict);
520 }
521
522 return 0;
523 }
524
525 static int _pam_winbind_init_context(pam_handle_t *pamh,
526 int flags,
527 int argc,
528 const char **argv,
529 struct pwb_context **ctx_p)
530 {
531 struct pwb_context *r = NULL;
532
533 #ifdef HAVE_GETTEXT
534 textdomain_init();
535 #endif
536
537 r = TALLOC_ZERO_P(NULL, struct pwb_context);
538 if (!r) {
539 return PAM_BUF_ERR;
540 }
541
542 talloc_set_destructor(r, _pam_winbind_free_context);
543
544 r->pamh = pamh;
545 r->flags = flags;
546 r->argc = argc;
547 r->argv = argv;
548 r->ctrl = _pam_parse(pamh, flags, argc, argv, &r->dict);
549 if (r->ctrl == -1) {
550 TALLOC_FREE(r);
551 return PAM_SYSTEM_ERR;
552 }
553
554 *ctx_p = r;
555
556 return PAM_SUCCESS;
557 }
558
559 static void _pam_winbind_cleanup_func(pam_handle_t *pamh,
560 void *data,
561 int error_status)
562 {
563 int ctrl = _pam_parse(pamh, 0, 0, NULL, NULL);
564 if (_pam_log_is_debug_state_enabled(ctrl)) {
565 __pam_log_debug(pamh, ctrl, LOG_DEBUG,
566 "[pamh: %p] CLEAN: cleaning up PAM data %p "
567 "(error_status = %d)", pamh, data,
568 error_status);
569 }
570 TALLOC_FREE(data);
571 }
572
573
574 static const struct ntstatus_errors {
575 const char *ntstatus_string;
576 const char *error_string;
577 } ntstatus_errors[] = {
578 {"NT_STATUS_OK",
579 N_("Success")},
580 {"NT_STATUS_BACKUP_CONTROLLER",
581 N_("No primary Domain Controler available")},
582 {"NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
583 N_("No domain controllers found")},
584 {"NT_STATUS_NO_LOGON_SERVERS",
585 N_("No logon servers")},
586 {"NT_STATUS_PWD_TOO_SHORT",
587 N_("Password too short")},
588 {"NT_STATUS_PWD_TOO_RECENT",
589 N_("The password of this user is too recent to change")},
590 {"NT_STATUS_PWD_HISTORY_CONFLICT",
591 N_("Password is already in password history")},
592 {"NT_STATUS_PASSWORD_EXPIRED",
593 N_("Your password has expired")},
594 {"NT_STATUS_PASSWORD_MUST_CHANGE",
595 N_("You need to change your password now")},
596 {"NT_STATUS_INVALID_WORKSTATION",
597 N_("You are not allowed to logon from this workstation")},
598 {"NT_STATUS_INVALID_LOGON_HOURS",
599 N_("You are not allowed to logon at this time")},
600 {"NT_STATUS_ACCOUNT_EXPIRED",
601 N_("Your account has expired. "
602 "Please contact your System administrator")}, /* SCNR */
603 {"NT_STATUS_ACCOUNT_DISABLED",
604 N_("Your account is disabled. "
605 "Please contact your System administrator")}, /* SCNR */
606 {"NT_STATUS_ACCOUNT_LOCKED_OUT",
607 N_("Your account has been locked. "
608 "Please contact your System administrator")}, /* SCNR */
609 {"NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
610 N_("Invalid Trust Account")},
611 {"NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
612 N_("Invalid Trust Account")},
613 {"NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
614 N_("Invalid Trust Account")},
615 {"NT_STATUS_ACCESS_DENIED",
616 N_("Access is denied")},
617 {NULL, NULL}
618 };
619
620 static const char *_get_ntstatus_error_string(const char *nt_status_string)
621 {
622 int i;
623 for (i=0; ntstatus_errors[i].ntstatus_string != NULL; i++) {
624 if (!strcasecmp(ntstatus_errors[i].ntstatus_string,
625 nt_status_string)) {
626 return _(ntstatus_errors[i].error_string);
627 }
628 }
629 return NULL;
630 }
631
632 /* --- authentication management functions --- */
633
634 /* Attempt a conversation */
635
636 static int converse(const pam_handle_t *pamh,
637 int nargs,
638 struct pam_message **message,
639 struct pam_response **response)
640 {
641 int retval;
642 struct pam_conv *conv;
643
644 retval = _pam_get_item(pamh, PAM_CONV, &conv);
645 if (retval == PAM_SUCCESS) {
646 retval = conv->conv(nargs,
647 (const struct pam_message **)message,
648 response, conv->appdata_ptr);
649 }
650
651 return retval; /* propagate error status */
652 }
653
654
655 static int _make_remark(struct pwb_context *ctx,
656 int type,
657 const char *text)
658 {
659 int retval = PAM_SUCCESS;
660
661 struct pam_message *pmsg[1], msg[1];
662 struct pam_response *resp;
663
664 if (ctx->flags & WINBIND_SILENT) {
665 return PAM_SUCCESS;
666 }
667
668 pmsg[0] = &msg[0];
669 msg[0].msg = discard_const_p(char, text);
670 msg[0].msg_style = type;
671
672 resp = NULL;
673 retval = converse(ctx->pamh, 1, pmsg, &resp);
674
675 if (resp) {
676 _pam_drop_reply(resp, 1);
677 }
678 return retval;
679 }
680
681 static int _make_remark_v(struct pwb_context *ctx,
682 int type,
683 const char *format,
684 va_list args)
685 {
686 char *var;
687 int ret;
688
689 ret = vasprintf(&var, format, args);
690 if (ret < 0) {
691 _pam_log(ctx, LOG_ERR, "memory allocation failure");
692 return ret;
693 }
694
695 ret = _make_remark(ctx, type, var);
696 SAFE_FREE(var);
697 return ret;
698 }
699
700 static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
701 static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...)
702 {
703 int ret;
704 va_list args;
705
706 va_start(args, format);
707 ret = _make_remark_v(ctx, type, format, args);
708 va_end(args);
709 return ret;
710 }
711
712 static int pam_winbind_request_log(struct pwb_context *ctx,
713 int retval,
714 const char *user,
715 const char *fn)
716 {
717 switch (retval) {
718 case PAM_AUTH_ERR:
719 /* incorrect password */
720 _pam_log(ctx, LOG_WARNING, "user '%s' denied access "
721 "(incorrect password or invalid membership)", user);
722 return retval;
723 case PAM_ACCT_EXPIRED:
724 /* account expired */
725 _pam_log(ctx, LOG_WARNING, "user '%s' account expired",
726 user);
727 return retval;
728 case PAM_AUTHTOK_EXPIRED:
729 /* password expired */
730 _pam_log(ctx, LOG_WARNING, "user '%s' password expired",
731 user);
732 return retval;
733 case PAM_NEW_AUTHTOK_REQD:
734 /* new password required */
735 _pam_log(ctx, LOG_WARNING, "user '%s' new password "
736 "required", user);
737 return retval;
738 case PAM_USER_UNKNOWN:
739 /* the user does not exist */
740 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
741 user);
742 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
743 return PAM_IGNORE;
744 }
745 return retval;
746 case PAM_SUCCESS:
747 /* Otherwise, the authentication looked good */
748 if (strcmp(fn, "wbcLogonUser") == 0) {
749 _pam_log(ctx, LOG_NOTICE,
750 "user '%s' granted access", user);
751 } else {
752 _pam_log(ctx, LOG_NOTICE,
753 "user '%s' OK", user);
754 }
755 return retval;
756 default:
757 /* we don't know anything about this return value */
758 _pam_log(ctx, LOG_ERR,
759 "internal module error (retval = %s(%d), user = '%s')",
760 _pam_error_code_str(retval), retval, user);
761 return retval;
762 }
763 }
764
765 static int wbc_auth_error_to_pam_error(struct pwb_context *ctx,
766 struct wbcAuthErrorInfo *e,
767 wbcErr status,
768 const char *username,
769 const char *fn)
770 {
771 int ret = PAM_AUTH_ERR;
772
773 if (WBC_ERROR_IS_OK(status)) {
774 _pam_log_debug(ctx, LOG_DEBUG, "request %s succeeded",
775 fn);
776 ret = PAM_SUCCESS;
777 return pam_winbind_request_log(ctx, ret, username, fn);
778 }
779
780 if (e) {
781 if (e->pam_error != PAM_SUCCESS) {
782 _pam_log(ctx, LOG_ERR,
783 "request %s failed: %s, "
784 "PAM error: %s (%d), NTSTATUS: %s, "
785 "Error message was: %s",
786 fn,
787 wbcErrorString(status),
788 _pam_error_code_str(e->pam_error),
789 e->pam_error,
790 e->nt_string,
791 e->display_string);
792 ret = e->pam_error;
793 return pam_winbind_request_log(ctx, ret, username, fn);
794 }
795
796 _pam_log(ctx, LOG_ERR, "request %s failed, but PAM error 0!", fn);
797
798 ret = PAM_SERVICE_ERR;
799 return pam_winbind_request_log(ctx, ret, username, fn);
800 }
801
802 ret = wbc_error_to_pam_error(status);
803 return pam_winbind_request_log(ctx, ret, username, fn);
804 }
805
806
807 /**
808 * send a password expiry message if required
809 *
810 * @param ctx PAM winbind context.
811 * @param next_change expected (calculated) next expiry date.
812 * @param already_expired pointer to a boolean to indicate if the password is
813 * already expired.
814 *
815 * @return boolean Returns true if message has been sent, false if not.
816 */
817
818 static bool _pam_send_password_expiry_message(struct pwb_context *ctx,
819 time_t next_change,
820 time_t now,
821 int warn_pwd_expire,
822 bool *already_expired)
823 {
824 int days = 0;
825 struct tm tm_now, tm_next_change;
826
827 if (already_expired) {
828 *already_expired = false;
829 }
830
831 if (next_change <= now) {
832 PAM_WB_REMARK_DIRECT(ctx, "NT_STATUS_PASSWORD_EXPIRED");
833 if (already_expired) {
834 *already_expired = true;
835 }
836 return true;
837 }
838
839 if ((next_change < 0) ||
840 (next_change > now + warn_pwd_expire * SECONDS_PER_DAY)) {
841 return false;
842 }
843
844 if ((localtime_r(&now, &tm_now) == NULL) ||
845 (localtime_r(&next_change, &tm_next_change) == NULL)) {
846 return false;
847 }
848
849 days = (tm_next_change.tm_yday+tm_next_change.tm_year*365) -
850 (tm_now.tm_yday+tm_now.tm_year*365);
851
852 if (days == 0) {
853 _make_remark(ctx, PAM_TEXT_INFO,
854 _("Your password expires today"));
855 return true;
856 }
857
858 if (days > 0 && days < warn_pwd_expire) {
859 _make_remark_format(ctx, PAM_TEXT_INFO,
860 _("Your password will expire in %d %s"),
861 days, (days > 1) ? _("days"):_("day"));
862 return true;
863 }
864
865 return false;
866 }
867
868 /**
869 * Send a warning if the password expires in the near future
870 *
871 * @param ctx PAM winbind context.
872 * @param response The full authentication response structure.
873 * @param already_expired boolean, is the pwd already expired?
874 *
875 * @return void.
876 */
877
878 static void _pam_warn_password_expiry(struct pwb_context *ctx,
879 const struct wbcAuthUserInfo *info,
880 const struct wbcUserPasswordPolicyInfo *policy,
881 int warn_pwd_expire,
882 bool *already_expired)
883 {
884 time_t now = time(NULL);
885 time_t next_change = 0;
886
887 if (!info || !policy) {
888 return;
889 }
890
891 if (already_expired) {
892 *already_expired = false;
893 }
894
895 /* accounts with WBC_ACB_PWNOEXP set never receive a warning */
896 if (info->acct_flags & WBC_ACB_PWNOEXP) {
897 return;
898 }
899
900 /* no point in sending a warning if this is a grace logon */
901 if (PAM_WB_GRACE_LOGON(info->user_flags)) {
902 return;
903 }
904
905 /* check if the info3 must change timestamp has been set */
906 next_change = info->pass_must_change_time;
907
908 if (_pam_send_password_expiry_message(ctx, next_change, now,
909 warn_pwd_expire,
910 already_expired)) {
911 return;
912 }
913
914 /* now check for the global password policy */
915 /* good catch from Ralf Haferkamp: an expiry of "never" is translated
916 * to -1 */
917 if ((policy->expire == (int64_t)-1) ||
918 (policy->expire == 0)) {
919 return;
920 }
921
922 next_change = info->pass_last_set_time + policy->expire;
923
924 if (_pam_send_password_expiry_message(ctx, next_change, now,
925 warn_pwd_expire,
926 already_expired)) {
927 return;
928 }
929
930 /* no warning sent */
931 }
932
933 #define IS_SID_STRING(name) (strncmp("S-", name, 2) == 0)
934
935 /**
936 * Append a string, making sure not to overflow and to always return a
937 * NULL-terminated string.
938 *
939 * @param dest Destination string buffer (must already be NULL-terminated).
940 * @param src Source string buffer.
941 * @param dest_buffer_size Size of dest buffer in bytes.
942 *
943 * @return false if dest buffer is not big enough (no bytes copied), true on
944 * success.
945 */
946
947 static bool safe_append_string(char *dest,
948 const char *src,
949 int dest_buffer_size)
950 {
951 int dest_length = strlen(dest);
952 int src_length = strlen(src);
953
954 if (dest_length + src_length + 1 > dest_buffer_size) {
955 return false;
956 }
957
958 memcpy(dest + dest_length, src, src_length + 1);
959 return true;
960 }
961
962 /**
963 * Convert a names into a SID string, appending it to a buffer.
964 *
965 * @param ctx PAM winbind context.
966 * @param user User in PAM request.
967 * @param name Name to convert.
968 * @param sid_list_buffer Where to append the string sid.
969 * @param sid_list_buffer Size of sid_list_buffer (in bytes).
970 *
971 * @return false on failure, true on success.
972 */
973 static bool winbind_name_to_sid_string(struct pwb_context *ctx,
974 const char *user,
975 const char *name,
976 char *sid_list_buffer,
977 int sid_list_buffer_size)
978 {
979 const char* sid_string;
980
981 /* lookup name? */
982 if (IS_SID_STRING(name)) {
983 sid_string = name;
984 } else {
985 wbcErr wbc_status;
986 struct wbcDomainSid sid;
987 enum wbcSidType type;
988 char *sid_str;
989
990 _pam_log_debug(ctx, LOG_DEBUG,
991 "no sid given, looking up: %s\n", name);
992
993 wbc_status = wbcLookupName("", name, &sid, &type);
994 if (!WBC_ERROR_IS_OK(wbc_status)) {
995 _pam_log(ctx, LOG_INFO,
996 "could not lookup name: %s\n", name);
997 return false;
998 }
999
1000 wbc_status = wbcSidToString(&sid, &sid_str);
1001 if (!WBC_ERROR_IS_OK(wbc_status)) {
1002 return false;
1003 }
1004
1005 wbcFreeMemory(sid_str);
1006 sid_string = sid_str;
1007 }
1008
1009 if (!safe_append_string(sid_list_buffer, sid_string,
1010 sid_list_buffer_size)) {
1011 return false;
1012 }
1013
1014 return true;
1015 }
1016
1017 /**
1018 * Convert a list of names into a list of sids.
1019 *
1020 * @param ctx PAM winbind context.
1021 * @param user User in PAM request.
1022 * @param name_list List of names or string sids, separated by commas.
1023 * @param sid_list_buffer Where to put the list of string sids.
1024 * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1025 *
1026 * @return false on failure, true on success.
1027 */
1028 static bool winbind_name_list_to_sid_string_list(struct pwb_context *ctx,
1029 const char *user,
1030 const char *name_list,
1031 char *sid_list_buffer,
1032 int sid_list_buffer_size)
1033 {
1034 bool result = false;
1035 char *current_name = NULL;
1036 const char *search_location;
1037 const char *comma;
1038
1039 if (sid_list_buffer_size > 0) {
1040 sid_list_buffer[0] = 0;
1041 }
1042
1043 search_location = name_list;
1044 while ((comma = strstr(search_location, ",")) != NULL) {
1045 current_name = strndup(search_location,
1046 comma - search_location);
1047 if (NULL == current_name) {
1048 goto out;
1049 }
1050
1051 if (!winbind_name_to_sid_string(ctx, user,
1052 current_name,
1053 sid_list_buffer,
1054 sid_list_buffer_size)) {
1055 goto out;
1056 }
1057
1058 SAFE_FREE(current_name);
1059
1060 if (!safe_append_string(sid_list_buffer, ",",
1061 sid_list_buffer_size)) {
1062 goto out;
1063 }
1064
1065 search_location = comma + 1;
1066 }
1067
1068 if (!winbind_name_to_sid_string(ctx, user, search_location,
1069 sid_list_buffer,
1070 sid_list_buffer_size)) {
1071 goto out;
1072 }
1073
1074 result = true;
1075
1076 out:
1077 SAFE_FREE(current_name);
1078 return result;
1079 }
1080
1081 /**
1082 * put krb5ccname variable into environment
1083 *
1084 * @param ctx PAM winbind context.
1085 * @param krb5ccname env variable retrieved from winbindd.
1086 *
1087 * @return void.
1088 */
1089
1090 static void _pam_setup_krb5_env(struct pwb_context *ctx,
1091 struct wbcLogonUserInfo *info)
1092 {
1093 char var[PATH_MAX];
1094 int ret;
1095 uint32_t i;
1096 const char *krb5ccname = NULL;
1097
1098 if (off(ctx->ctrl, WINBIND_KRB5_AUTH)) {
1099 return;
1100 }
1101
1102 if (!info) {
1103 return;
1104 }
1105
1106 for (i=0; i < info->num_blobs; i++) {
1107 if (strcasecmp(info->blobs[i].name, "krb5ccname") == 0) {
1108 krb5ccname = (const char *)info->blobs[i].blob.data;
1109 break;
1110 }
1111 }
1112
1113 if (!krb5ccname || (strlen(krb5ccname) == 0)) {
1114 return;
1115 }
1116
1117 _pam_log_debug(ctx, LOG_DEBUG,
1118 "request returned KRB5CCNAME: %s", krb5ccname);
1119
1120 if (snprintf(var, sizeof(var), "KRB5CCNAME=%s", krb5ccname) == -1) {
1121 return;
1122 }
1123
1124 ret = pam_putenv(ctx->pamh, var);
1125 if (ret) {
1126 _pam_log(ctx, LOG_ERR,
1127 "failed to set KRB5CCNAME to %s: %s",
1128 var, pam_strerror(ctx->pamh, ret));
1129 }
1130 }
1131
1132 /**
1133 * Copy unix username if available (further processed in PAM).
1134 *
1135 * @param ctx PAM winbind context
1136 * @param user_ret A pointer that holds a pointer to a string
1137 * @param unix_username A username
1138 *
1139 * @return void.
1140 */
1141
1142 static void _pam_setup_unix_username(struct pwb_context *ctx,
1143 char **user_ret,
1144 struct wbcLogonUserInfo *info)
1145 {
1146 const char *unix_username = NULL;
1147 uint32_t i;
1148
1149 if (!user_ret || !info) {
1150 return;
1151 }
1152
1153 for (i=0; i < info->num_blobs; i++) {
1154 if (strcasecmp(info->blobs[i].name, "unix_username") == 0) {
1155 unix_username = (const char *)info->blobs[i].blob.data;
1156 break;
1157 }
1158 }
1159
1160 if (!unix_username || !unix_username[0]) {
1161 return;
1162 }
1163
1164 *user_ret = strdup(unix_username);
1165 }
1166
1167 /**
1168 * Set string into the PAM stack.
1169 *
1170 * @param ctx PAM winbind context.
1171 * @param data_name Key name for pam_set_data.
1172 * @param value String value.
1173 *
1174 * @return void.
1175 */
1176
1177 static void _pam_set_data_string(struct pwb_context *ctx,
1178 const char *data_name,
1179 const char *value)
1180 {
1181 int ret;
1182
1183 if (!data_name || !value || (strlen(data_name) == 0) ||
1184 (strlen(value) == 0)) {
1185 return;
1186 }
1187
1188 ret = pam_set_data(ctx->pamh, data_name, talloc_strdup(NULL, value),
1189 _pam_winbind_cleanup_func);
1190 if (ret) {
1191 _pam_log_debug(ctx, LOG_DEBUG,
1192 "Could not set data %s: %s\n",
1193 data_name, pam_strerror(ctx->pamh, ret));
1194 }
1195 }
1196
1197 /**
1198 * Set info3 strings into the PAM stack.
1199 *
1200 * @param ctx PAM winbind context.
1201 * @param data_name Key name for pam_set_data.
1202 * @param value String value.
1203 *
1204 * @return void.
1205 */
1206
1207 static void _pam_set_data_info3(struct pwb_context *ctx,
1208 const struct wbcAuthUserInfo *info)
1209 {
1210 _pam_set_data_string(ctx, PAM_WINBIND_HOMEDIR,
1211 info->home_directory);
1212 _pam_set_data_string(ctx, PAM_WINBIND_LOGONSCRIPT,
1213 info->logon_script);
1214 _pam_set_data_string(ctx, PAM_WINBIND_LOGONSERVER,
1215 info->logon_server);
1216 _pam_set_data_string(ctx, PAM_WINBIND_PROFILEPATH,
1217 info->profile_path);
1218 }
1219
1220 /**
1221 * Free info3 strings in the PAM stack.
1222 *
1223 * @param pamh PAM handle
1224 *
1225 * @return void.
1226 */
1227
1228 static void _pam_free_data_info3(pam_handle_t *pamh)
1229 {
1230 pam_set_data(pamh, PAM_WINBIND_HOMEDIR, NULL, NULL);
1231 pam_set_data(pamh, PAM_WINBIND_LOGONSCRIPT, NULL, NULL);
1232 pam_set_data(pamh, PAM_WINBIND_LOGONSERVER, NULL, NULL);
1233 pam_set_data(pamh, PAM_WINBIND_PROFILEPATH, NULL, NULL);
1234 }
1235
1236 /**
1237 * Send PAM_ERROR_MSG for cached or grace logons.
1238 *
1239 * @param ctx PAM winbind context.
1240 * @param username User in PAM request.
1241 * @param info3_user_flgs Info3 flags containing logon type bits.
1242 *
1243 * @return void.
1244 */
1245
1246 static void _pam_warn_logon_type(struct pwb_context *ctx,
1247 const char *username,
1248 uint32_t info3_user_flgs)
1249 {
1250 /* inform about logon type */
1251 if (PAM_WB_GRACE_LOGON(info3_user_flgs)) {
1252
1253 _make_remark(ctx, PAM_ERROR_MSG,
1254 _("Grace login. "
1255 "Please change your password as soon you're "
1256 "online again"));
1257 _pam_log_debug(ctx, LOG_DEBUG,
1258 "User %s logged on using grace logon\n",
1259 username);
1260
1261 } else if (PAM_WB_CACHED_LOGON(info3_user_flgs)) {
1262
1263 _make_remark(ctx, PAM_ERROR_MSG,
1264 _("Domain Controller unreachable, "
1265 "using cached credentials instead. "
1266 "Network resources may be unavailable"));
1267 _pam_log_debug(ctx, LOG_DEBUG,
1268 "User %s logged on using cached credentials\n",
1269 username);
1270 }
1271 }
1272
1273 /**
1274 * Send PAM_ERROR_MSG for krb5 errors.
1275 *
1276 * @param ctx PAM winbind context.
1277 * @param username User in PAM request.
1278 * @param info3_user_flgs Info3 flags containing logon type bits.
1279 *
1280 * @return void.
1281 */
1282
1283 static void _pam_warn_krb5_failure(struct pwb_context *ctx,
1284 const char *username,
1285 uint32_t info3_user_flgs)
1286 {
1287 if (PAM_WB_KRB5_CLOCK_SKEW(info3_user_flgs)) {
1288 _make_remark(ctx, PAM_ERROR_MSG,
1289 _("Failed to establish your Kerberos Ticket cache "
1290 "due time differences\n"
1291 "with the domain controller. "
1292 "Please verify the system time.\n"));
1293 _pam_log_debug(ctx, LOG_DEBUG,
1294 "User %s: Clock skew when getting Krb5 TGT\n",
1295 username);
1296 }
1297 }
1298
1299 static bool _pam_check_remark_auth_err(struct pwb_context *ctx,
1300 const struct wbcAuthErrorInfo *e,
1301 const char *nt_status_string,
1302 int *pam_error)
1303 {
1304 const char *ntstatus = NULL;
1305 const char *error_string = NULL;
1306
1307 if (!e || !pam_error) {
1308 return false;
1309 }
1310
1311 ntstatus = e->nt_string;
1312 if (!ntstatus) {
1313 return false;
1314 }
1315
1316 if (strcasecmp(ntstatus, nt_status_string) == 0) {
1317
1318 error_string = _get_ntstatus_error_string(nt_status_string);
1319 if (error_string) {
1320 _make_remark(ctx, PAM_ERROR_MSG, error_string);
1321 *pam_error = e->pam_error;
1322 return true;
1323 }
1324
1325 if (e->display_string) {
1326 _make_remark(ctx, PAM_ERROR_MSG, e->display_string);
1327 *pam_error = e->pam_error;
1328 return true;
1329 }
1330
1331 _make_remark(ctx, PAM_ERROR_MSG, nt_status_string);
1332 *pam_error = e->pam_error;
1333
1334 return true;
1335 }
1336
1337 return false;
1338 };
1339
1340 /**
1341 * Compose Password Restriction String for a PAM_ERROR_MSG conversation.
1342 *
1343 * @param i The wbcUserPasswordPolicyInfo struct.
1344 *
1345 * @return string (caller needs to talloc_free).
1346 */
1347
1348 static char *_pam_compose_pwd_restriction_string(struct pwb_context *ctx,
1349 struct wbcUserPasswordPolicyInfo *i)
1350 {
1351 char *str = NULL;
1352
1353 if (!i) {
1354 goto failed;
1355 }
1356
1357 str = talloc_asprintf(ctx, _("Your password "));
1358 if (!str) {
1359 goto failed;
1360 }
1361
1362 if (i->min_length_password > 0) {
1363 str = talloc_asprintf_append(str,
1364 _("must be at least %d characters; "),
1365 i->min_length_password);
1366 if (!str) {
1367 goto failed;
1368 }
1369 }
1370
1371 if (i->password_history > 0) {
1372 str = talloc_asprintf_append(str,
1373 _("cannot repeat any of your previous %d "
1374 "passwords; "),
1375 i->password_history);
1376 if (!str) {
1377 goto failed;
1378 }
1379 }
1380
1381 if (i->password_properties & WBC_DOMAIN_PASSWORD_COMPLEX) {
1382 str = talloc_asprintf_append(str,
1383 _("must contain capitals, numerals "
1384 "or punctuation; "
1385 "and cannot contain your account "
1386 "or full name; "));
1387 if (!str) {
1388 goto failed;
1389 }
1390 }
1391
1392 str = talloc_asprintf_append(str,
1393 _("Please type a different password. "
1394 "Type a password which meets these requirements in "
1395 "both text boxes."));
1396 if (!str) {
1397 goto failed;
1398 }
1399
1400 return str;
1401
1402 failed:
1403 TALLOC_FREE(str);
1404 return NULL;
1405 }
1406
1407 static int _pam_create_homedir(struct pwb_context *ctx,
1408 const char *dirname,
1409 mode_t mode)
1410 {
1411 struct stat sbuf;
1412
1413 if (stat(dirname, &sbuf) == 0) {
1414 return PAM_SUCCESS;
1415 }
1416
1417 if (mkdir(dirname, mode) != 0) {
1418
1419 _make_remark_format(ctx, PAM_TEXT_INFO,
1420 _("Creating directory: %s failed: %s"),
1421 dirname, strerror(errno));
1422 _pam_log(ctx, LOG_ERR, "could not create dir: %s (%s)",
1423 dirname, strerror(errno));
1424 return PAM_PERM_DENIED;
1425 }
1426
1427 return PAM_SUCCESS;
1428 }
1429
1430 static int _pam_chown_homedir(struct pwb_context *ctx,
1431 const char *dirname,
1432 uid_t uid,
1433 gid_t gid)
1434 {
1435 if (chown(dirname, uid, gid) != 0) {
1436 _pam_log(ctx, LOG_ERR, "failed to chown user homedir: %s (%s)",
1437 dirname, strerror(errno));
1438 return PAM_PERM_DENIED;
1439 }
1440
1441 return PAM_SUCCESS;
1442 }
1443
1444 static int _pam_mkhomedir(struct pwb_context *ctx)
1445 {
1446 struct passwd *pwd = NULL;
1447 char *token = NULL;
1448 char *create_dir = NULL;
1449 char *user_dir = NULL;
1450 int ret;
1451 const char *username;
1452 mode_t mode = 0700;
1453 char *safe_ptr = NULL;
1454 char *p = NULL;
1455
1456 /* Get the username */
1457 ret = pam_get_user(ctx->pamh, &username, NULL);
1458 if ((ret != PAM_SUCCESS) || (!username)) {
1459 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1460 return PAM_SERVICE_ERR;
1461 }
1462
1463 pwd = getpwnam(username);
1464 if (pwd == NULL) {
1465 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1466 return PAM_USER_UNKNOWN;
1467 }
1468 _pam_log_debug(ctx, LOG_DEBUG, "homedir is: %s", pwd->pw_dir);
1469
1470 ret = _pam_create_homedir(ctx, pwd->pw_dir, 0700);
1471 if (ret == PAM_SUCCESS) {
1472 ret = _pam_chown_homedir(ctx, pwd->pw_dir,
1473 pwd->pw_uid,
1474 pwd->pw_gid);
1475 }
1476
1477 if (ret == PAM_SUCCESS) {
1478 return ret;
1479 }
1480
1481 /* maybe we need to create parent dirs */
1482 create_dir = talloc_strdup(ctx, "/");
1483 if (!create_dir) {
1484 return PAM_BUF_ERR;
1485 }
1486
1487 /* find final directory */
1488 user_dir = strrchr(pwd->pw_dir, '/');
1489 if (!user_dir) {
1490 return PAM_BUF_ERR;
1491 }
1492 user_dir++;
1493
1494 _pam_log(ctx, LOG_DEBUG, "final directory: %s", user_dir);
1495
1496 p = pwd->pw_dir;
1497
1498 while ((token = strtok_r(p, "/", &safe_ptr)) != NULL) {
1499
1500 mode = 0755;
1501
1502 p = NULL;
1503
1504 _pam_log_debug(ctx, LOG_DEBUG, "token is %s", token);
1505
1506 create_dir = talloc_asprintf_append(create_dir, "%s/", token);
1507 if (!create_dir) {
1508 return PAM_BUF_ERR;
1509 }
1510 _pam_log_debug(ctx, LOG_DEBUG, "current_dir is %s", create_dir);
1511
1512 if (strcmp(token, user_dir) == 0) {
1513 _pam_log_debug(ctx, LOG_DEBUG, "assuming last directory: %s", token);
1514 mode = 0700;
1515 }
1516
1517 ret = _pam_create_homedir(ctx, create_dir, mode);
1518 if (ret) {
1519 return ret;
1520 }
1521 }
1522
1523 return _pam_chown_homedir(ctx, create_dir,
1524 pwd->pw_uid,
1525 pwd->pw_gid);
1526 }
1527
1528 /* talk to winbindd */
1529 static int winbind_auth_request(struct pwb_context *ctx,
1530 const char *user,
1531 const char *pass,
1532 const char *member,
1533 const char *cctype,
1534 const int warn_pwd_expire,
1535 struct wbcAuthErrorInfo **p_error,
1536 struct wbcLogonUserInfo **p_info,
1537 struct wbcUserPasswordPolicyInfo **p_policy,
1538 time_t *pwd_last_set,
1539 char **user_ret)
1540 {
1541 wbcErr wbc_status;
1542
1543 struct wbcLogonUserParams logon;
1544 char membership_of[1024];
1545 uid_t user_uid = -1;
1546 uint32_t flags = WBFLAG_PAM_INFO3_TEXT |
1547 WBFLAG_PAM_GET_PWD_POLICY;
1548
1549 struct wbcLogonUserInfo *info = NULL;
1550 struct wbcAuthUserInfo *user_info = NULL;
1551 struct wbcAuthErrorInfo *error = NULL;
1552 struct wbcUserPasswordPolicyInfo *policy = NULL;
1553
1554 int ret = PAM_AUTH_ERR;
1555 int i;
1556 const char *codes[] = {
1557 "NT_STATUS_PASSWORD_EXPIRED",
1558 "NT_STATUS_PASSWORD_MUST_CHANGE",
1559 "NT_STATUS_INVALID_WORKSTATION",
1560 "NT_STATUS_INVALID_LOGON_HOURS",
1561 "NT_STATUS_ACCOUNT_EXPIRED",
1562 "NT_STATUS_ACCOUNT_DISABLED",
1563 "NT_STATUS_ACCOUNT_LOCKED_OUT",
1564 "NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
1565 "NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
1566 "NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
1567 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1568 "NT_STATUS_NO_LOGON_SERVERS",
1569 "NT_STATUS_WRONG_PASSWORD",
1570 "NT_STATUS_ACCESS_DENIED"
1571 };
1572
1573 if (pwd_last_set) {
1574 *pwd_last_set = 0;
1575 }
1576
1577 /* Krb5 auth always has to go against the KDC of the user's realm */
1578
1579 if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1580 flags |= WBFLAG_PAM_CONTACT_TRUSTDOM;
1581 }
1582
1583 if (ctx->ctrl & (WINBIND_KRB5_AUTH|WINBIND_CACHED_LOGIN)) {
1584 struct passwd *pwd = NULL;
1585
1586 pwd = getpwnam(user);
1587 if (pwd == NULL) {
1588 return PAM_USER_UNKNOWN;
1589 }
1590 user_uid = pwd->pw_uid;
1591 }
1592
1593 if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1594
1595 _pam_log_debug(ctx, LOG_DEBUG,
1596 "enabling krb5 login flag\n");
1597
1598 flags |= WBFLAG_PAM_KRB5 |
1599 WBFLAG_PAM_FALLBACK_AFTER_KRB5;
1600 }
1601
1602 if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1603 _pam_log_debug(ctx, LOG_DEBUG,
1604 "enabling cached login flag\n");
1605 flags |= WBFLAG_PAM_CACHED_LOGIN;
1606 }
1607
1608 if (user_ret) {
1609 *user_ret = NULL;
1610 flags |= WBFLAG_PAM_UNIX_NAME;
1611 }
1612
1613 if (cctype != NULL) {
1614 _pam_log_debug(ctx, LOG_DEBUG,
1615 "enabling request for a %s krb5 ccache\n",
1616 cctype);
1617 }
1618
1619 if (member != NULL) {
1620
1621 ZERO_STRUCT(membership_of);
1622
1623 if (!winbind_name_list_to_sid_string_list(ctx, user, member,
1624 membership_of,
1625 sizeof(membership_of))) {
1626 _pam_log_debug(ctx, LOG_ERR,
1627 "failed to serialize membership of sid "
1628 "\"%s\"\n", member);
1629 return PAM_AUTH_ERR;
1630 }
1631 }
1632
1633 ZERO_STRUCT(logon);
1634
1635 logon.username = user;
1636 logon.password = pass;
1637
1638 if (cctype) {
1639 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1640 &logon.blobs,
1641 "krb5_cc_type",
1642 0,
1643 (uint8_t *)cctype,
1644 strlen(cctype)+1);
1645 if (!WBC_ERROR_IS_OK(wbc_status)) {
1646 goto done;
1647 }
1648 }
1649
1650 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1651 &logon.blobs,
1652 "flags",
1653 0,
1654 (uint8_t *)&flags,
1655 sizeof(flags));
1656 if (!WBC_ERROR_IS_OK(wbc_status)) {
1657 goto done;
1658 }
1659
1660 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1661 &logon.blobs,
1662 "user_uid",
1663 0,
1664 (uint8_t *)&user_uid,
1665 sizeof(user_uid));
1666 if (!WBC_ERROR_IS_OK(wbc_status)) {
1667 goto done;
1668 }
1669
1670 if (member) {
1671 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1672 &logon.blobs,
1673 "membership_of",
1674 0,
1675 (uint8_t *)membership_of,
1676 sizeof(membership_of));
1677 if (!WBC_ERROR_IS_OK(wbc_status)) {
1678 goto done;
1679 }
1680 }
1681
1682 wbc_status = wbcLogonUser(&logon, &info, &error, &policy);
1683 ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1684 user, "wbcLogonUser");
1685 wbcFreeMemory(logon.blobs);
1686 logon.blobs = NULL;
1687
1688 if (info && info->info) {
1689 user_info = info->info;
1690 }
1691
1692 if (pwd_last_set && user_info) {
1693 *pwd_last_set = user_info->pass_last_set_time;
1694 }
1695
1696 if (p_info && info) {
1697 *p_info = info;
1698 }
1699
1700 if (p_policy && policy) {
1701 *p_policy = policy;
1702 }
1703
1704 if (p_error && error) {
1705 /* We want to process the error in the caller. */
1706 *p_error = error;
1707 return ret;
1708 }
1709
1710 for (i=0; i<ARRAY_SIZE(codes); i++) {
1711 int _ret = ret;
1712 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1713 ret = _ret;
1714 goto done;
1715 }
1716 }
1717
1718 if ((ret == PAM_SUCCESS) && user_info && policy && info) {
1719
1720 bool already_expired = false;
1721
1722 /* warn a user if the password is about to expire soon */
1723 _pam_warn_password_expiry(ctx, user_info, policy,
1724 warn_pwd_expire,
1725 &already_expired);
1726
1727 if (already_expired == true) {
1728
1729 SMB_TIME_T last_set = user_info->pass_last_set_time;
1730
1731 _pam_log_debug(ctx, LOG_DEBUG,
1732 "Password has expired "
1733 "(Password was last set: %lld, "
1734 "the policy says it should expire here "
1735 "%lld (now it's: %lu))\n",
1736 (long long int)last_set,
1737 (long long int)last_set +
1738 policy->expire,
1739 time(NULL));
1740
1741 return PAM_AUTHTOK_EXPIRED;
1742 }
1743
1744 /* inform about logon type */
1745 _pam_warn_logon_type(ctx, user, user_info->user_flags);
1746
1747 /* inform about krb5 failures */
1748 _pam_warn_krb5_failure(ctx, user, user_info->user_flags);
1749
1750 /* set some info3 info for other modules in the stack */
1751 _pam_set_data_info3(ctx, user_info);
1752
1753 /* put krb5ccname into env */
1754 _pam_setup_krb5_env(ctx, info);
1755
1756 /* If winbindd returned a username, return the pointer to it
1757 * here. */
1758 _pam_setup_unix_username(ctx, user_ret, info);
1759 }
1760
1761 done:
1762 if (logon.blobs) {
1763 wbcFreeMemory(logon.blobs);
1764 }
1765 if (info && info->blobs) {
1766 wbcFreeMemory(info->blobs);
1767 }
1768 if (error && !p_error) {
1769 wbcFreeMemory(error);
1770 }
1771 if (info && !p_info) {
1772 wbcFreeMemory(info);
1773 }
1774 if (policy && !p_policy) {
1775 wbcFreeMemory(policy);
1776 }
1777
1778 return ret;
1779 }
1780
1781 /* talk to winbindd */
1782 static int winbind_chauthtok_request(struct pwb_context *ctx,
1783 const char *user,
1784 const char *oldpass,
1785 const char *newpass,
1786 time_t pwd_last_set)
1787 {
1788 wbcErr wbc_status;
1789 struct wbcChangePasswordParams params;
1790 struct wbcAuthErrorInfo *error = NULL;
1791 struct wbcUserPasswordPolicyInfo *policy = NULL;
1792 enum wbcPasswordChangeRejectReason reject_reason = -1;
1793 uint32_t flags = 0;
1794
1795 int i;
1796 const char *codes[] = {
1797 "NT_STATUS_BACKUP_CONTROLLER",
1798 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1799 "NT_STATUS_NO_LOGON_SERVERS",
1800 "NT_STATUS_ACCESS_DENIED",
1801 "NT_STATUS_PWD_TOO_SHORT", /* TODO: tell the min pwd length ? */
1802 "NT_STATUS_PWD_TOO_RECENT", /* TODO: tell the minage ? */
1803 "NT_STATUS_PWD_HISTORY_CONFLICT" /* TODO: tell the history length ? */
1804 };
1805 int ret = PAM_AUTH_ERR;
1806
1807 ZERO_STRUCT(params);
1808
1809 if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1810 flags |= WBFLAG_PAM_KRB5 |
1811 WBFLAG_PAM_CONTACT_TRUSTDOM;
1812 }
1813
1814 if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1815 flags |= WBFLAG_PAM_CACHED_LOGIN;
1816 }
1817
1818 params.account_name = user;
1819 params.level = WBC_AUTH_USER_LEVEL_PLAIN;
1820 params.old_password.plaintext = oldpass;
1821 params.new_password.plaintext = newpass;
1822 params.flags = flags;
1823
1824 wbc_status = wbcChangeUserPasswordEx(&params, &error, &reject_reason, &policy);
1825 ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1826 user, "wbcChangeUserPasswordEx");
1827
1828 if (WBC_ERROR_IS_OK(wbc_status)) {
1829 _pam_log(ctx, LOG_NOTICE,
1830 "user '%s' password changed", user);
1831 return PAM_SUCCESS;
1832 }
1833
1834 if (!error) {
1835 wbcFreeMemory(policy);
1836 return ret;
1837 }
1838
1839 for (i=0; i<ARRAY_SIZE(codes); i++) {
1840 int _ret = ret;
1841 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1842 ret = _ret;
1843 goto done;
1844 }
1845 }
1846
1847 if (!strcasecmp(error->nt_string,
1848 "NT_STATUS_PASSWORD_RESTRICTION")) {
1849
1850 char *pwd_restriction_string = NULL;
1851 SMB_TIME_T min_pwd_age = 0;
1852
1853 if (policy) {
1854 min_pwd_age = policy->min_passwordage;
1855 }
1856
1857 /* FIXME: avoid to send multiple PAM messages after another */
1858 switch (reject_reason) {
1859 case -1:
1860 break;
1861 case WBC_PWD_CHANGE_REJECT_OTHER:
1862 if ((min_pwd_age > 0) &&
1863 (pwd_last_set + min_pwd_age > time(NULL))) {
1864 PAM_WB_REMARK_DIRECT(ctx,
1865 "NT_STATUS_PWD_TOO_RECENT");
1866 }
1867 break;
1868 case WBC_PWD_CHANGE_REJECT_TOO_SHORT:
1869 PAM_WB_REMARK_DIRECT(ctx,
1870 "NT_STATUS_PWD_TOO_SHORT");
1871 break;
1872 case WBC_PWD_CHANGE_REJECT_IN_HISTORY:
1873 PAM_WB_REMARK_DIRECT(ctx,
1874 "NT_STATUS_PWD_HISTORY_CONFLICT");
1875 break;
1876 case WBC_PWD_CHANGE_REJECT_COMPLEXITY:
1877 _make_remark(ctx, PAM_ERROR_MSG,
1878 _("Password does not meet "
1879 "complexity requirements"));
1880 break;
1881 default:
1882 _pam_log_debug(ctx, LOG_DEBUG,
1883 "unknown password change "
1884 "reject reason: %d",
1885 reject_reason);
1886 break;
1887 }
1888
1889 pwd_restriction_string =
1890 _pam_compose_pwd_restriction_string(ctx, policy);
1891 if (pwd_restriction_string) {
1892 _make_remark(ctx, PAM_ERROR_MSG,
1893 pwd_restriction_string);
1894 TALLOC_FREE(pwd_restriction_string);
1895 }
1896 }
1897 done:
1898 wbcFreeMemory(error);
1899 wbcFreeMemory(policy);
1900
1901 return ret;
1902 }
1903
1904 /*
1905 * Checks if a user has an account
1906 *
1907 * return values:
1908 * 1 = User not found
1909 * 0 = OK
1910 * -1 = System error
1911 */
1912 static int valid_user(struct pwb_context *ctx,
1913 const char *user)
1914 {
1915 /* check not only if the user is available over NSS calls, also make
1916 * sure it's really a winbind user, this is important when stacking PAM
1917 * modules in the 'account' or 'password' facility. */
1918
1919 wbcErr wbc_status;
1920 struct passwd *pwd = NULL;
1921 struct passwd *wb_pwd = NULL;
1922
1923 pwd = getpwnam(user);
1924 if (pwd == NULL) {
1925 return 1;
1926 }
1927
1928 wbc_status = wbcGetpwnam(user, &wb_pwd);
1929 wbcFreeMemory(wb_pwd);
1930 if (!WBC_ERROR_IS_OK(wbc_status)) {
1931 _pam_log(ctx, LOG_DEBUG, "valid_user: wbcGetpwnam gave %s\n",
1932 wbcErrorString(wbc_status));
1933 }
1934
1935 switch (wbc_status) {
1936 case WBC_ERR_UNKNOWN_USER:
1937 return 1;
1938 case WBC_ERR_SUCCESS:
1939 return 0;
1940 default:
1941 break;
1942 }
1943 return -1;
1944 }
1945
1946 static char *_pam_delete(register char *xx)
1947 {
1948 _pam_overwrite(xx);
1949 _pam_drop(xx);
1950 return NULL;
1951 }
1952
1953 /*
1954 * obtain a password from the user
1955 */
1956
1957 static int _winbind_read_password(struct pwb_context *ctx,
1958 unsigned int ctrl,
1959 const char *comment,
1960 const char *prompt1,
1961 const char *prompt2,
1962 const char **pass)
1963 {
1964 int authtok_flag;
1965 int retval;
1966 const char *item;
1967 char *token;
1968
1969 _pam_log(ctx, LOG_DEBUG, "getting password (0x%08x)", ctrl);
1970
1971 /*
1972 * make sure nothing inappropriate gets returned
1973 */
1974
1975 *pass = token = NULL;
1976
1977 /*
1978 * which authentication token are we getting?
1979 */
1980
1981 if (on(WINBIND__OLD_PASSWORD, ctrl)) {
1982 authtok_flag = PAM_OLDAUTHTOK;
1983 } else {
1984 authtok_flag = PAM_AUTHTOK;
1985 }
1986
1987 /*
1988 * should we obtain the password from a PAM item ?
1989 */
1990
1991 if (on(WINBIND_TRY_FIRST_PASS_ARG, ctrl) ||
1992 on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
1993 retval = _pam_get_item(ctx->pamh, authtok_flag, &item);
1994 if (retval != PAM_SUCCESS) {
1995 /* very strange. */
1996 _pam_log(ctx, LOG_ALERT,
1997 "pam_get_item returned error "
1998 "to unix-read-password");
1999 return retval;
2000 } else if (item != NULL) { /* we have a password! */
2001 *pass = item;
2002 item = NULL;
2003 _pam_log(ctx, LOG_DEBUG,
2004 "pam_get_item returned a password");
2005 return PAM_SUCCESS;
2006 } else if (on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2007 return PAM_AUTHTOK_RECOVER_ERR; /* didn't work */
2008 } else if (on(WINBIND_USE_AUTHTOK_ARG, ctrl)
2009 && off(WINBIND__OLD_PASSWORD, ctrl)) {
2010 return PAM_AUTHTOK_RECOVER_ERR;
2011 }
2012 }
2013 /*
2014 * getting here implies we will have to get the password from the
2015 * user directly.
2016 */
2017
2018 {
2019 struct pam_message msg[3], *pmsg[3];
2020 struct pam_response *resp;
2021 int i, replies;
2022
2023 /* prepare to converse */
2024
2025 if (comment != NULL && off(ctrl, WINBIND_SILENT)) {
2026 pmsg[0] = &msg[0];
2027 msg[0].msg_style = PAM_TEXT_INFO;
2028 msg[0].msg = discard_const_p(char, comment);
2029 i = 1;
2030 } else {
2031 i = 0;
2032 }
2033
2034 pmsg[i] = &msg[i];
2035 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2036 msg[i++].msg = discard_const_p(char, prompt1);
2037 replies = 1;
2038
2039 if (prompt2 != NULL) {
2040 pmsg[i] = &msg[i];
2041 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2042 msg[i++].msg = discard_const_p(char, prompt2);
2043 ++replies;
2044 }
2045 /* so call the conversation expecting i responses */
2046 resp = NULL;
2047 retval = converse(ctx->pamh, i, pmsg, &resp);
2048 if (resp == NULL) {
2049 if (retval == PAM_SUCCESS) {
2050 retval = PAM_AUTHTOK_RECOVER_ERR;
2051 }
2052 goto done;
2053 }
2054 if (retval != PAM_SUCCESS) {
2055 _pam_drop_reply(resp, i);
2056 goto done;
2057 }
2058
2059 /* interpret the response */
2060
2061 token = x_strdup(resp[i - replies].resp);
2062 if (!token) {
2063 _pam_log(ctx, LOG_NOTICE,
2064 "could not recover "
2065 "authentication token");
2066 retval = PAM_AUTHTOK_RECOVER_ERR;
2067 goto done;
2068 }
2069
2070 if (replies == 2) {
2071 /* verify that password entered correctly */
2072 if (!resp[i - 1].resp ||
2073 strcmp(token, resp[i - 1].resp)) {
2074 _pam_delete(token); /* mistyped */
2075 retval = PAM_AUTHTOK_RECOVER_ERR;
2076 _make_remark(ctx, PAM_ERROR_MSG,
2077 MISTYPED_PASS);
2078 }
2079 }
2080
2081 /*
2082 * tidy up the conversation (resp_retcode) is ignored
2083 * -- what is it for anyway? AGM
2084 */
2085 _pam_drop_reply(resp, i);
2086 }
2087
2088 done:
2089 if (retval != PAM_SUCCESS) {
2090 _pam_log_debug(ctx, LOG_DEBUG,
2091 "unable to obtain a password");
2092 return retval;
2093 }
2094 /* 'token' is the entered password */
2095
2096 /* we store this password as an item */
2097
2098 retval = pam_set_item(ctx->pamh, authtok_flag, token);
2099 _pam_delete(token); /* clean it up */
2100 if (retval != PAM_SUCCESS ||
2101 (retval = _pam_get_item(ctx->pamh, authtok_flag, &item)) != PAM_SUCCESS) {
2102
2103 _pam_log(ctx, LOG_CRIT, "error manipulating password");
2104 return retval;
2105
2106 }
2107
2108 *pass = item;
2109 item = NULL; /* break link to password */
2110
2111 return PAM_SUCCESS;
2112 }
2113
2114 static const char *get_conf_item_string(struct pwb_context *ctx,
2115 const char *item,
2116 int config_flag)
2117 {
2118 int i = 0;
2119 const char *parm_opt = NULL;
2120
2121 if (!(ctx->ctrl & config_flag)) {
2122 goto out;
2123 }
2124
2125 /* let the pam opt take precedence over the pam_winbind.conf option */
2126 for (i=0; i<ctx->argc; i++) {
2127
2128 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2129 char *p;
2130
2131 if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2132 _pam_log(ctx, LOG_INFO,
2133 "no \"=\" delimiter for \"%s\" found\n",
2134 item);
2135 goto out;
2136 }
2137 _pam_log_debug(ctx, LOG_INFO,
2138 "PAM config: %s '%s'\n", item, p+1);
2139 return p + 1;
2140 }
2141 }
2142
2143 if (ctx->dict) {
2144 char *key = NULL;
2145
2146 key = talloc_asprintf(ctx, "global:%s", item);
2147 if (!key) {
2148 goto out;
2149 }
2150
2151 parm_opt = iniparser_getstr(ctx->dict, key);
2152 TALLOC_FREE(key);
2153
2154 _pam_log_debug(ctx, LOG_INFO, "CONFIG file: %s '%s'\n",
2155 item, parm_opt);
2156 }
2157 out:
2158 return parm_opt;
2159 }
2160
2161 static int get_config_item_int(struct pwb_context *ctx,
2162 const char *item,
2163 int config_flag)
2164 {
2165 int i, parm_opt = -1;
2166
2167 if (!(ctx->ctrl & config_flag)) {
2168 goto out;
2169 }
2170
2171 /* let the pam opt take precedence over the pam_winbind.conf option */
2172 for (i = 0; i < ctx->argc; i++) {
2173
2174 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2175 char *p;
2176
2177 if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2178 _pam_log(ctx, LOG_INFO,
2179 "no \"=\" delimiter for \"%s\" found\n",
2180 item);
2181 goto out;
2182 }
2183 parm_opt = atoi(p + 1);
2184 _pam_log_debug(ctx, LOG_INFO,
2185 "PAM config: %s '%d'\n",
2186 item, parm_opt);
2187 return parm_opt;
2188 }
2189 }
2190
2191 if (ctx->dict) {
2192 char *key = NULL;
2193
2194 key = talloc_asprintf(ctx, "global:%s", item);
2195 if (!key) {
2196 goto out;
2197 }
2198
2199 parm_opt = iniparser_getint(ctx->dict, key, -1);
2200 TALLOC_FREE(key);
2201
2202 _pam_log_debug(ctx, LOG_INFO,
2203 "CONFIG file: %s '%d'\n",
2204 item, parm_opt);
2205 }
2206 out:
2207 return parm_opt;
2208 }
2209
2210 static const char *get_krb5_cc_type_from_config(struct pwb_context *ctx)
2211 {
2212 return get_conf_item_string(ctx, "krb5_ccache_type",
2213 WINBIND_KRB5_CCACHE_TYPE);
2214 }
2215
2216 static const char *get_member_from_config(struct pwb_context *ctx)
2217 {
2218 const char *ret = NULL;
2219 ret = get_conf_item_string(ctx, "require_membership_of",
2220 WINBIND_REQUIRED_MEMBERSHIP);
2221 if (ret) {
2222 return ret;
2223 }
2224 return get_conf_item_string(ctx, "require-membership-of",
2225 WINBIND_REQUIRED_MEMBERSHIP);
2226 }
2227
2228 static int get_warn_pwd_expire_from_config(struct pwb_context *ctx)
2229 {
2230 int ret;
2231 ret = get_config_item_int(ctx, "warn_pwd_expire",
2232 WINBIND_WARN_PWD_EXPIRE);
2233 /* no or broken setting */
2234 if (ret <= 0) {
2235 return DEFAULT_DAYS_TO_WARN_BEFORE_PWD_EXPIRES;
2236 }
2237 return ret;
2238 }
2239
2240 /**
2241 * Retrieve the winbind separator.
2242 *
2243 * @param ctx PAM winbind context.
2244 *
2245 * @return string separator character. NULL on failure.
2246 */
2247
2248 static char winbind_get_separator(struct pwb_context *ctx)
2249 {
2250 wbcErr wbc_status;
2251 static struct wbcInterfaceDetails *details = NULL;
2252
2253 wbc_status = wbcInterfaceDetails(&details);
2254 if (!WBC_ERROR_IS_OK(wbc_status)) {
2255 _pam_log(ctx, LOG_ERR,
2256 "Could not retrieve winbind interface details: %s",
2257 wbcErrorString(wbc_status));
2258 return '\0';
2259 }
2260
2261 if (!details) {
2262 return '\0';
2263 }
2264
2265 return details->winbind_separator;
2266 }
2267
2268
2269 /**
2270 * Convert a upn to a name.
2271 *
2272 * @param ctx PAM winbind context.
2273 * @param upn USer UPN to be trabslated.
2274 *
2275 * @return converted name. NULL pointer on failure. Caller needs to free.
2276 */
2277
2278 static char* winbind_upn_to_username(struct pwb_context *ctx,
2279 const char *upn)
2280 {
2281 char sep;
2282 wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;
2283 struct wbcDomainSid sid;
2284 enum wbcSidType type;
2285 char *domain;
2286 char *name;
2287
2288 /* This cannot work when the winbind separator = @ */
2289
2290 sep = winbind_get_separator(ctx);
2291 if (!sep || sep == '@') {
2292 return NULL;
2293 }
2294
2295 /* Convert the UPN to a SID */
2296
2297 wbc_status = wbcLookupName("", upn, &sid, &type);
2298 if (!WBC_ERROR_IS_OK(wbc_status)) {
2299 return NULL;
2300 }
2301
2302 /* Convert the the SID back to the sAMAccountName */
2303
2304 wbc_status = wbcLookupSid(&sid, &domain, &name, &type);
2305 if (!WBC_ERROR_IS_OK(wbc_status)) {
2306 return NULL;
2307 }
2308
2309 return talloc_asprintf(ctx, "%s\\%s", domain, name);
2310 }
2311
2312 static int _pam_delete_cred(pam_handle_t *pamh, int flags,
2313 int argc, const char **argv)
2314 {
2315 int retval = PAM_SUCCESS;
2316 struct pwb_context *ctx = NULL;
2317 struct wbcLogoffUserParams logoff;
2318 struct wbcAuthErrorInfo *error = NULL;
2319 const char *user;
2320 wbcErr wbc_status = WBC_ERR_SUCCESS;
2321
2322 ZERO_STRUCT(logoff);
2323
2324 retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2325 if (retval) {
2326 goto out;
2327 }
2328
2329 _PAM_LOG_FUNCTION_ENTER("_pam_delete_cred", ctx);
2330
2331 if (ctx->ctrl & WINBIND_KRB5_AUTH) {
2332
2333 /* destroy the ccache here */
2334
2335 uint32_t wbc_flags = 0;
2336 const char *ccname = NULL;
2337 struct passwd *pwd = NULL;
2338
2339 retval = pam_get_user(pamh, &user, _("Username: "));
2340 if (retval) {
2341 _pam_log(ctx, LOG_ERR,
2342 "could not identify user");
2343 goto out;
2344 }
2345
2346 if (user == NULL) {
2347 _pam_log(ctx, LOG_ERR,
2348 "username was NULL!");
2349 retval = PAM_USER_UNKNOWN;
2350 goto out;
2351 }
2352
2353 _pam_log_debug(ctx, LOG_DEBUG,
2354 "username [%s] obtained", user);
2355
2356 ccname = pam_getenv(pamh, "KRB5CCNAME");
2357 if (ccname == NULL) {
2358 _pam_log_debug(ctx, LOG_DEBUG,
2359 "user has no KRB5CCNAME environment");
2360 }
2361
2362 pwd = getpwnam(user);
2363 if (pwd == NULL) {
2364 retval = PAM_USER_UNKNOWN;
2365 goto out;
2366 }
2367
2368 wbc_flags = WBFLAG_PAM_KRB5 |
2369 WBFLAG_PAM_CONTACT_TRUSTDOM;
2370
2371 logoff.username = user;
2372
2373 if (ccname) {
2374 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2375 &logoff.blobs,
2376 "ccfilename",
2377 0,
2378 (uint8_t *)ccname,
2379 strlen(ccname)+1);
2380 if (!WBC_ERROR_IS_OK(wbc_status)) {
2381 goto out;
2382 }
2383 }
2384
2385 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2386 &logoff.blobs,
2387 "flags",
2388 0,
2389 (uint8_t *)&wbc_flags,
2390 sizeof(wbc_flags));
2391 if (!WBC_ERROR_IS_OK(wbc_status)) {
2392 goto out;
2393 }
2394
2395 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2396 &logoff.blobs,
2397 "user_uid",
2398 0,
2399 (uint8_t *)&pwd->pw_uid,
2400 sizeof(pwd->pw_uid));
2401 if (!WBC_ERROR_IS_OK(wbc_status)) {
2402 goto out;
2403 }
2404
2405 wbc_status = wbcLogoffUserEx(&logoff, &error);
2406 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2407 user, "wbcLogoffUser");
2408 wbcFreeMemory(error);
2409 wbcFreeMemory(logoff.blobs);
2410 logoff.blobs = NULL;
2411
2412 if (!WBC_ERROR_IS_OK(wbc_status)) {
2413 _pam_log(ctx, LOG_INFO,
2414 "failed to logoff user %s: %s\n",
2415 user, wbcErrorString(wbc_status));
2416 }
2417 }
2418
2419 out:
2420 if (logoff.blobs) {
2421 wbcFreeMemory(logoff.blobs);
2422 }
2423
2424 if (!WBC_ERROR_IS_OK(wbc_status)) {
2425 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2426 user, "wbcLogoffUser");
2427 }
2428
2429 /*
2430 * Delete the krb5 ccname variable from the PAM environment
2431 * if it was set by winbind.
2432 */
2433 if ((ctx->ctrl & WINBIND_KRB5_AUTH) && pam_getenv(pamh, "KRB5CCNAME")) {
2434 pam_putenv(pamh, "KRB5CCNAME");
2435 }
2436
2437 _PAM_LOG_FUNCTION_LEAVE("_pam_delete_cred", ctx, retval);
2438
2439 TALLOC_FREE(ctx);
2440
2441 return retval;
2442 }
2443
2444 PAM_EXTERN
2445 int pam_sm_authenticate(pam_handle_t *pamh, int flags,
2446 int argc, const char **argv)
2447 {
2448 const char *username;
2449 const char *password;
2450 const char *member = NULL;
2451 const char *cctype = NULL;
2452 int warn_pwd_expire;
2453 int retval = PAM_AUTH_ERR;
2454 char *username_ret = NULL;
2455 char *new_authtok_required = NULL;
2456 char *real_username = NULL;
2457 struct pwb_context *ctx = NULL;
2458
2459 retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2460 if (retval) {
2461 goto out;
2462 }
2463
2464 _PAM_LOG_FUNCTION_ENTER("pam_sm_authenticate", ctx);
2465
2466 /* Get the username */
2467 retval = pam_get_user(pamh, &username, NULL);
2468 if ((retval != PAM_SUCCESS) || (!username)) {
2469 _pam_log_debug(ctx, LOG_DEBUG,
2470 "can not get the username");
2471 retval = PAM_SERVICE_ERR;
2472 goto out;
2473 }
2474
2475
2476 #if defined(AIX)
2477 /* Decode the user name since AIX does not support logn user
2478 names by default. The name is encoded as _#uid. */
2479
2480 if (username[0] == '_') {
2481 uid_t id = atoi(&username[1]);
2482 struct passwd *pw = NULL;
2483
2484 if ((id!=0) && ((pw = getpwuid(id)) != NULL)) {
2485 real_username = strdup(pw->pw_name);
2486 }
2487 }
2488 #endif
2489
2490 if (!real_username) {
2491 /* Just making a copy of the username we got from PAM */
2492 if ((real_username = strdup(username)) == NULL) {
2493 _pam_log_debug(ctx, LOG_DEBUG,
2494 "memory allocation failure when copying "
2495 "username");
2496 retval = PAM_SERVICE_ERR;
2497 goto out;
2498 }
2499 }
2500
2501 /* Maybe this was a UPN */
2502
2503 if (strchr(real_username, '@') != NULL) {
2504 char *samaccountname = NULL;
2505
2506 samaccountname = winbind_upn_to_username(ctx,
2507 real_username);
2508 if (samaccountname) {
2509 free(real_username);
2510 real_username = strdup(samaccountname);
2511 }
2512 }
2513
2514 retval = _winbind_read_password(ctx, ctx->ctrl, NULL,
2515 _("Password: "), NULL,
2516 &password);
2517
2518 if (retval != PAM_SUCCESS) {
2519 _pam_log(ctx, LOG_ERR,
2520 "Could not retrieve user's password");
2521 retval = PAM_AUTHTOK_ERR;
2522 goto out;
2523 }
2524
2525 /* Let's not give too much away in the log file */
2526
2527 #ifdef DEBUG_PASSWORD
2528 _pam_log_debug(ctx, LOG_INFO,
2529 "Verify user '%s' with password '%s'",
2530 real_username, password);
2531 #else
2532 _pam_log_debug(ctx, LOG_INFO,
2533 "Verify user '%s'", real_username);
2534 #endif
2535
2536 member = get_member_from_config(ctx);
2537 cctype = get_krb5_cc_type_from_config(ctx);
2538 warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
2539
2540 /* Now use the username to look up password */
2541 retval = winbind_auth_request(ctx, real_username, password,
2542 member, cctype, warn_pwd_expire,
2543 NULL, NULL, NULL,
2544 NULL, &username_ret);
2545
2546 if (retval == PAM_NEW_AUTHTOK_REQD ||
2547 retval == PAM_AUTHTOK_EXPIRED) {
2548
2549 char *new_authtok_required_during_auth = NULL;
2550
2551 new_authtok_required = talloc_asprintf(NULL, "%d", retval);
2552 if (!new_authtok_required) {
2553 retval = PAM_BUF_ERR;
2554 goto out;
2555 }
2556
2557 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2558 new_authtok_required,
2559 _pam_winbind_cleanup_func);
2560
2561 retval = PAM_SUCCESS;
2562
2563 new_authtok_required_during_auth = talloc_asprintf(NULL, "%d", true);
2564 if (!new_authtok_required_during_auth) {
2565 retval = PAM_BUF_ERR;
2566 goto out;
2567 }
2568
2569 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2570 new_authtok_required_during_auth,
2571 _pam_winbind_cleanup_func);
2572
2573 goto out;
2574 }
2575
2576 out:
2577 if (username_ret) {
2578 pam_set_item (pamh, PAM_USER, username_ret);
2579 _pam_log_debug(ctx, LOG_INFO,
2580 "Returned user was '%s'", username_ret);
2581 free(username_ret);
2582 }
2583
2584 if (real_username) {
2585 free(real_username);
2586 }
2587
2588 if (!new_authtok_required) {
2589 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, NULL, NULL);
2590 }
2591
2592 if (retval != PAM_SUCCESS) {
2593 _pam_free_data_info3(pamh);
2594 }
2595
2596 _PAM_LOG_FUNCTION_LEAVE("pam_sm_authenticate", ctx, retval);
2597
2598 TALLOC_FREE(ctx);
2599
2600 return retval;
2601 }
2602
2603 PAM_EXTERN
2604 int pam_sm_setcred(pam_handle_t *pamh, int flags,
2605 int argc, const char **argv)
2606 {
2607 int ret = PAM_SYSTEM_ERR;
2608 struct pwb_context *ctx = NULL;
2609
2610 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2611 if (ret) {
2612 goto out;
2613 }
2614
2615 _PAM_LOG_FUNCTION_ENTER("pam_sm_setcred", ctx);
2616
2617 switch (flags & ~PAM_SILENT) {
2618
2619 case PAM_DELETE_CRED:
2620 ret = _pam_delete_cred(pamh, flags, argc, argv);
2621 break;
2622 case PAM_REFRESH_CRED:
2623 _pam_log_debug(ctx, LOG_WARNING,
2624 "PAM_REFRESH_CRED not implemented");
2625 ret = PAM_SUCCESS;
2626 break;
2627 case PAM_REINITIALIZE_CRED:
2628 _pam_log_debug(ctx, LOG_WARNING,
2629 "PAM_REINITIALIZE_CRED not implemented");
2630 ret = PAM_SUCCESS;
2631 break;
2632 case PAM_ESTABLISH_CRED:
2633 _pam_log_debug(ctx, LOG_WARNING,
2634 "PAM_ESTABLISH_CRED not implemented");
2635 ret = PAM_SUCCESS;
2636 break;
2637 default:
2638 ret = PAM_SYSTEM_ERR;
2639 break;
2640 }
2641
2642 out:
2643
2644 _PAM_LOG_FUNCTION_LEAVE("pam_sm_setcred", ctx, ret);
2645
2646 TALLOC_FREE(ctx);
2647
2648 return ret;
2649 }
2650
2651 /*
2652 * Account management. We want to verify that the account exists
2653 * before returning PAM_SUCCESS
2654 */
2655 PAM_EXTERN
2656 int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
2657 int argc, const char **argv)
2658 {
2659 const char *username;
2660 int ret = PAM_USER_UNKNOWN;
2661 void *tmp = NULL;
2662 struct pwb_context *ctx = NULL;
2663
2664 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2665 if (ret) {
2666 goto out;
2667 }
2668
2669 _PAM_LOG_FUNCTION_ENTER("pam_sm_acct_mgmt", ctx);
2670
2671
2672 /* Get the username */
2673 ret = pam_get_user(pamh, &username, NULL);
2674 if ((ret != PAM_SUCCESS) || (!username)) {
2675 _pam_log_debug(ctx, LOG_DEBUG,
2676 "can not get the username");
2677 ret = PAM_SERVICE_ERR;
2678 goto out;
2679 }
2680
2681 /* Verify the username */
2682 ret = valid_user(ctx, username);
2683 switch (ret) {
2684 case -1:
2685 /* some sort of system error. The log was already printed */
2686 ret = PAM_SERVICE_ERR;
2687 goto out;
2688 case 1:
2689 /* the user does not exist */
2690 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
2691 username);
2692 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
2693 ret = PAM_IGNORE;
2694 goto out;
2695 }
2696 ret = PAM_USER_UNKNOWN;
2697 goto out;
2698 case 0:
2699 pam_get_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2700 (const void **)&tmp);
2701 if (tmp != NULL) {
2702 ret = atoi((const char *)tmp);
2703 switch (ret) {
2704 case PAM_AUTHTOK_EXPIRED:
2705 /* fall through, since new token is required in this case */
2706 case PAM_NEW_AUTHTOK_REQD:
2707 _pam_log(ctx, LOG_WARNING,
2708 "pam_sm_acct_mgmt success but %s is set",
2709 PAM_WINBIND_NEW_AUTHTOK_REQD);
2710 _pam_log(ctx, LOG_NOTICE,
2711 "user '%s' needs new password",
2712 username);
2713 /* PAM_AUTHTOKEN_REQD does not exist, but is documented in the manpage */
2714 ret = PAM_NEW_AUTHTOK_REQD;
2715 goto out;
2716 default:
2717 _pam_log(ctx, LOG_WARNING,
2718 "pam_sm_acct_mgmt success");
2719 _pam_log(ctx, LOG_NOTICE,
2720 "user '%s' granted access", username);
2721 ret = PAM_SUCCESS;
2722 goto out;
2723 }
2724 }
2725
2726 /* Otherwise, the authentication looked good */
2727 _pam_log(ctx, LOG_NOTICE,
2728 "user '%s' granted access", username);
2729 ret = PAM_SUCCESS;
2730 goto out;
2731 default:
2732 /* we don't know anything about this return value */
2733 _pam_log(ctx, LOG_ERR,
2734 "internal module error (ret = %d, user = '%s')",
2735 ret, username);
2736 ret = PAM_SERVICE_ERR;
2737 goto out;
2738 }
2739
2740 /* should not be reached */
2741 ret = PAM_IGNORE;
2742
2743 out:
2744
2745 _PAM_LOG_FUNCTION_LEAVE("pam_sm_acct_mgmt", ctx, ret);
2746
2747 TALLOC_FREE(ctx);
2748
2749 return ret;
2750 }
2751
2752 PAM_EXTERN
2753 int pam_sm_open_session(pam_handle_t *pamh, int flags,
2754 int argc, const char **argv)
2755 {
2756 int ret = PAM_SUCCESS;
2757 struct pwb_context *ctx = NULL;
2758
2759 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2760 if (ret) {
2761 goto out;
2762 }
2763
2764 _PAM_LOG_FUNCTION_ENTER("pam_sm_open_session", ctx);
2765
2766 if (ctx->ctrl & WINBIND_MKHOMEDIR) {
2767 /* check and create homedir */
2768 ret = _pam_mkhomedir(ctx);
2769 }
2770 out:
2771 _PAM_LOG_FUNCTION_LEAVE("pam_sm_open_session", ctx, ret);
2772
2773 TALLOC_FREE(ctx);
2774
2775 return ret;
2776 }
2777
2778 PAM_EXTERN
2779 int pam_sm_close_session(pam_handle_t *pamh, int flags,
2780 int argc, const char **argv)
2781 {
2782 int ret = PAM_SUCCESS;
2783 struct pwb_context *ctx = NULL;
2784
2785 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2786 if (ret) {
2787 goto out;
2788 }
2789
2790 _PAM_LOG_FUNCTION_ENTER("pam_sm_close_session", ctx);
2791
2792 out:
2793 _PAM_LOG_FUNCTION_LEAVE("pam_sm_close_session", ctx, ret);
2794
2795 TALLOC_FREE(ctx);
2796
2797 return ret;
2798 }
2799
2800 /**
2801 * evaluate whether we need to re-authenticate with kerberos after a
2802 * password change
2803 *
2804 * @param ctx PAM winbind context.
2805 * @param user The username
2806 *
2807 * @return boolean Returns true if required, false if not.
2808 */
2809
2810 static bool _pam_require_krb5_auth_after_chauthtok(struct pwb_context *ctx,
2811 const char *user)
2812 {
2813
2814 /* Make sure that we only do this if a) the chauthtok got initiated
2815 * during a logon attempt (authenticate->acct_mgmt->chauthtok) b) any
2816 * later password change via the "passwd" command if done by the user
2817 * itself
2818 * NB. If we login from gdm or xdm and the password expires,
2819 * we change the password, but there is no memory cache.
2820 * Thus, even for passthrough login, we should do the
2821 * authentication again to update memory cache.
2822 * --- BoYang
2823 * */
2824
2825 char *new_authtok_reqd_during_auth = NULL;
2826 struct passwd *pwd = NULL;
2827
2828 _pam_get_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2829 &new_authtok_reqd_during_auth);
2830 pam_set_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2831 NULL, NULL);
2832
2833 if (new_authtok_reqd_during_auth) {
2834 return true;
2835 }
2836
2837 pwd = getpwnam(user);
2838 if (!pwd) {
2839 return false;
2840 }
2841
2842 if (getuid() == pwd->pw_uid) {
2843 return true;
2844 }
2845
2846 return false;
2847 }
2848
2849
2850 PAM_EXTERN
2851 int pam_sm_chauthtok(pam_handle_t * pamh, int flags,
2852 int argc, const char **argv)
2853 {
2854 unsigned int lctrl;
2855 int ret;
2856 bool cached_login = false;
2857
2858 /* <DO NOT free() THESE> */
2859 const char *user;
2860 char *pass_old, *pass_new;
2861 /* </DO NOT free() THESE> */
2862
2863 char *Announce;
2864
2865 int retry = 0;
2866 char *username_ret = NULL;
2867 struct wbcAuthErrorInfo *error = NULL;
2868 struct pwb_context *ctx = NULL;
2869
2870 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2871 if (ret) {
2872 goto out;
2873 }
2874
2875 _PAM_LOG_FUNCTION_ENTER("pam_sm_chauthtok", ctx);
2876
2877 cached_login = (ctx->ctrl & WINBIND_CACHED_LOGIN);
2878
2879 /* clearing offline bit for auth */
2880 ctx->ctrl &= ~WINBIND_CACHED_LOGIN;
2881
2882 /*
2883 * First get the name of a user
2884 */
2885 ret = pam_get_user(pamh, &user, _("Username: "));
2886 if (ret) {
2887 _pam_log(ctx, LOG_ERR,
2888 "password - could not identify user");
2889 goto out;
2890 }
2891
2892 if (user == NULL) {
2893 _pam_log(ctx, LOG_ERR, "username was NULL!");
2894 ret = PAM_USER_UNKNOWN;
2895 goto out;
2896 }
2897
2898 _pam_log_debug(ctx, LOG_DEBUG, "username [%s] obtained", user);
2899
2900 /* check if this is really a user in winbindd, not only in NSS */
2901 ret = valid_user(ctx, user);
2902 switch (ret) {
2903 case 1:
2904 ret = PAM_USER_UNKNOWN;
2905 goto out;
2906 case -1:
2907 ret = PAM_SYSTEM_ERR;
2908 goto out;
2909 default:
2910 break;
2911 }
2912
2913 /*
2914 * obtain and verify the current password (OLDAUTHTOK) for
2915 * the user.
2916 */
2917
2918 if (flags & PAM_PRELIM_CHECK) {
2919 time_t pwdlastset_prelim = 0;
2920
2921 /* instruct user what is happening */
2922
2923 #define greeting _("Changing password for")
2924 Announce = talloc_asprintf(ctx, "%s %s", greeting, user);
2925 if (!Announce) {
2926 _pam_log(ctx, LOG_CRIT,
2927 "password - out of memory");
2928 ret = PAM_BUF_ERR;
2929 goto out;
2930 }
2931 #undef greeting
2932
2933 lctrl = ctx->ctrl | WINBIND__OLD_PASSWORD;
2934 ret = _winbind_read_password(ctx, lctrl,
2935 Announce,
2936 _("(current) NT password: "),
2937 NULL,
2938 (const char **) &pass_old);
2939 TALLOC_FREE(Announce);
2940 if (ret != PAM_SUCCESS) {
2941 _pam_log(ctx, LOG_NOTICE,
2942 "password - (old) token not obtained");
2943 goto out;
2944 }
2945
2946 /* verify that this is the password for this user */
2947
2948 ret = winbind_auth_request(ctx, user, pass_old,
2949 NULL, NULL, 0,
2950 &error, NULL, NULL,
2951 &pwdlastset_prelim, NULL);
2952
2953 if (ret != PAM_ACCT_EXPIRED &&
2954 ret != PAM_AUTHTOK_EXPIRED &&
2955 ret != PAM_NEW_AUTHTOK_REQD &&
2956 ret != PAM_SUCCESS) {
2957 pass_old = NULL;
2958 goto out;
2959 }
2960
2961 pam_set_data(pamh, PAM_WINBIND_PWD_LAST_SET,
2962 (void *)pwdlastset_prelim, NULL);
2963
2964 ret = pam_set_item(pamh, PAM_OLDAUTHTOK,
2965 (const void *) pass_old);
2966 pass_old = NULL;
2967 if (ret != PAM_SUCCESS) {
2968 _pam_log(ctx, LOG_CRIT,
2969 "failed to set PAM_OLDAUTHTOK");
2970 }
2971 } else if (flags & PAM_UPDATE_AUTHTOK) {
2972
2973 time_t pwdlastset_update = 0;
2974
2975 /*
2976 * obtain the proposed password
2977 */
2978
2979 /*
2980 * get the old token back.
2981 */
2982
2983 ret = _pam_get_item(pamh, PAM_OLDAUTHTOK, &pass_old);
2984
2985 if (ret != PAM_SUCCESS) {
2986 _pam_log(ctx, LOG_NOTICE,
2987 "user not authenticated");
2988 goto out;
2989 }
2990
2991 lctrl = ctx->ctrl & ~WINBIND_TRY_FIRST_PASS_ARG;
2992
2993 if (on(WINBIND_USE_AUTHTOK_ARG, lctrl)) {
2994 lctrl |= WINBIND_USE_FIRST_PASS_ARG;
2995 }
2996 retry = 0;
2997 ret = PAM_AUTHTOK_ERR;
2998 while ((ret != PAM_SUCCESS) && (retry++ < MAX_PASSWD_TRIES)) {
2999 /*
3000 * use_authtok is to force the use of a previously entered
3001 * password -- needed for pluggable password strength checking
3002 */
3003
3004 ret = _winbind_read_password(ctx, lctrl,
3005 NULL,
3006 _("Enter new NT password: "),
3007 _("Retype new NT password: "),
3008 (const char **)&pass_new);
3009
3010 if (ret != PAM_SUCCESS) {
3011 _pam_log_debug(ctx, LOG_ALERT,
3012 "password - "
3013 "new password not obtained");
3014 pass_old = NULL;/* tidy up */
3015 goto out;
3016 }
3017
3018 /*
3019 * At this point we know who the user is and what they
3020 * propose as their new password. Verify that the new
3021 * password is acceptable.
3022 */
3023
3024 if (pass_new[0] == '\0') {/* "\0" password = NULL */
3025 pass_new = NULL;
3026 }
3027 }
3028
3029 /*
3030 * By reaching here we have approved the passwords and must now
3031 * rebuild the password database file.
3032 */
3033 _pam_get_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3034 &pwdlastset_update);
3035
3036 /*
3037 * if cached creds were enabled, make sure to set the
3038 * WINBIND_CACHED_LOGIN bit here in order to have winbindd
3039 * update the cached creds storage - gd
3040 */
3041 if (cached_login) {
3042 ctx->ctrl |= WINBIND_CACHED_LOGIN;
3043 }
3044
3045 ret = winbind_chauthtok_request(ctx, user, pass_old,
3046 pass_new, pwdlastset_update);
3047 if (ret) {
3048 _pam_overwrite(pass_new);
3049 _pam_overwrite(pass_old);
3050 pass_old = pass_new = NULL;
3051 goto out;
3052 }
3053
3054 if (_pam_require_krb5_auth_after_chauthtok(ctx, user)) {
3055
3056 const char *member = NULL;
3057 const char *cctype = NULL;
3058 int warn_pwd_expire;
3059 struct wbcLogonUserInfo *info = NULL;
3060 struct wbcUserPasswordPolicyInfo *policy = NULL;
3061
3062 member = get_member_from_config(ctx);
3063 cctype = get_krb5_cc_type_from_config(ctx);
3064 warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
3065
3066 /* Keep WINBIND_CACHED_LOGIN bit for
3067 * authentication after changing the password.
3068 * This will update the cached credentials in case
3069 * that winbindd_dual_pam_chauthtok() fails
3070 * to update them.
3071 * --- BoYang
3072 * */
3073
3074 ret = winbind_auth_request(ctx, user, pass_new,
3075 member, cctype, 0,
3076 &error, &info, &policy,
3077 NULL, &username_ret);
3078 _pam_overwrite(pass_new);
3079 _pam_overwrite(pass_old);
3080 pass_old = pass_new = NULL;
3081
3082 if (ret == PAM_SUCCESS) {
3083
3084 struct wbcAuthUserInfo *user_info = NULL;
3085
3086 if (info && info->info) {
3087 user_info = info->info;
3088 }
3089
3090 /* warn a user if the password is about to
3091 * expire soon */
3092 _pam_warn_password_expiry(ctx, user_info, policy,
3093 warn_pwd_expire,
3094 NULL);
3095
3096 /* set some info3 info for other modules in the
3097 * stack */
3098 _pam_set_data_info3(ctx, user_info);
3099
3100 /* put krb5ccname into env */
3101 _pam_setup_krb5_env(ctx, info);
3102
3103 if (username_ret) {
3104 pam_set_item(pamh, PAM_USER,
3105 username_ret);
3106 _pam_log_debug(ctx, LOG_INFO,
3107 "Returned user was '%s'",
3108 username_ret);
3109 free(username_ret);
3110 }
3111
3112 wbcFreeMemory(info);
3113 wbcFreeMemory(policy);
3114 }
3115
3116 goto out;
3117 }
3118 } else {
3119 ret = PAM_SERVICE_ERR;
3120 }
3121
3122 out:
3123 {
3124 /* Deal with offline errors. */
3125 int i;
3126 const char *codes[] = {
3127 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
3128 "NT_STATUS_NO_LOGON_SERVERS",
3129 "NT_STATUS_ACCESS_DENIED"
3130 };
3131
3132 for (i=0; i<ARRAY_SIZE(codes); i++) {
3133 int _ret;
3134 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
3135 break;
3136 }
3137 }
3138 }
3139
3140 wbcFreeMemory(error);
3141
3142 _PAM_LOG_FUNCTION_LEAVE("pam_sm_chauthtok", ctx, ret);
3143
3144 TALLOC_FREE(ctx);
3145
3146 return ret;
3147 }
3148
3149 #ifdef PAM_STATIC
3150
3151 /* static module data */
3152
3153 struct pam_module _pam_winbind_modstruct = {
3154 MODULE_NAME,
3155 pam_sm_authenticate,
3156 pam_sm_setcred,
3157 pam_sm_acct_mgmt,
3158 pam_sm_open_session,
3159 pam_sm_close_session,
3160 pam_sm_chauthtok
3161 };
3162
3163 #endif
3164
3165 /*
3166 * Copyright (c) Andrew Tridgell <tridge@samba.org> 2000
3167 * Copyright (c) Tim Potter <tpot@samba.org> 2000
3168 * Copyright (c) Andrew Bartlettt <abartlet@samba.org> 2002
3169 * Copyright (c) Guenther Deschner <gd@samba.org> 2005-2008
3170 * Copyright (c) Jan Rêkorajski 1999.
3171 * Copyright (c) Andrew G. Morgan 1996-8.
3172 * Copyright (c) Alex O. Yuriev, 1996.
3173 * Copyright (c) Cristian Gafton 1996.
3174 * Copyright (C) Elliot Lee <sopwith@redhat.com> 1996, Red Hat Software.
3175 *
3176 * Redistribution and use in source and binary forms, with or without
3177 * modification, are permitted provided that the following conditions
3178 * are met:
3179 * 1. Redistributions of source code must retain the above copyright
3180 * notice, and the entire permission notice in its entirety,
3181 * including the disclaimer of warranties.
3182 * 2. Redistributions in binary form must reproduce the above copyright
3183 * notice, this list of conditions and the following disclaimer in the
3184 * documentation and/or other materials provided with the distribution.
3185 * 3. The name of the author may not be used to endorse or promote
3186 * products derived from this software without specific prior
3187 * written permission.
3188 *
3189 * ALTERNATIVELY, this product may be distributed under the terms of
3190 * the GNU Public License, in which case the provisions of the GPL are
3191 * required INSTEAD OF the above restrictions. (This clause is
3192 * necessary due to a potential bad interaction between the GPL and
3193 * the restrictions contained in a BSD-style copyright.)
3194 *
3195 * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
3196 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
3197 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
3198 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
3199 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
3200 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
3201 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
3202 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
3203 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
3204 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
3205 * OF THE POSSIBILITY OF SUCH DAMAGE.
3206 */
aatanasov's samba4 branch