source: branches/samba-3.5.x/nsswitch/pam_winbind.c

Last change on this file was 738, checked in by Silvan Scherrer, 13 years ago

Samba Server 3.5: update branche to 3.5.18
File size: 81.3 KB
RevLine 
[736]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
17static 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
53static 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
153static char initialized = 0;
154
155static inline void textdomain_init(void);
156static 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 */
171static 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}
178static 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
189static 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
197static 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
220static bool _pam_log_is_silent(int ctrl)
221{
222 return on(ctrl, WINBIND_SILENT);
223}
224
225static void _pam_log(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
226static 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}
238static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
239static 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
252static 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
269static 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
278static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
279static 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}
291static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
292static 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
305static 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
353static 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
387static 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_getstring(d, CONST_DISCARD(char *, "global:krb5_ccache_type"), NULL) != NULL) {
441 ctrl |= WINBIND_KRB5_CCACHE_TYPE;
442 }
443
444 if ((iniparser_getstring(d, CONST_DISCARD(char *, "global:require-membership-of"), NULL)
445 != NULL) ||
446 (iniparser_getstring(d, CONST_DISCARD(char *, "global:require_membership_of"), NULL)
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
463config_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
516static 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
529static 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
563static 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
578static 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
624static 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
640static 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
659static 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
685static 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
704static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
705static 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
716static 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
769static int wbc_auth_error_to_pam_error(struct pwb_context *ctx,
770 struct wbcAuthErrorInfo *e,
771 wbcErr status,
772 const char *username,
773 const char *fn)
774{
775 int ret = PAM_AUTH_ERR;
776
777 if (WBC_ERROR_IS_OK(status)) {
778 _pam_log_debug(ctx, LOG_DEBUG, "request %s succeeded",
779 fn);
780 ret = PAM_SUCCESS;
781 return pam_winbind_request_log(ctx, ret, username, fn);
782 }
783
784 if (e) {
785 if (e->pam_error != PAM_SUCCESS) {
786 _pam_log(ctx, LOG_ERR,
787 "request %s failed: %s, "
788 "PAM error: %s (%d), NTSTATUS: %s, "
789 "Error message was: %s",
790 fn,
791 wbcErrorString(status),
792 _pam_error_code_str(e->pam_error),
793 e->pam_error,
794 e->nt_string,
795 e->display_string);
796 ret = e->pam_error;
797 return pam_winbind_request_log(ctx, ret, username, fn);
798 }
799
800 _pam_log(ctx, LOG_ERR, "request %s failed, but PAM error 0!", fn);
801
802 ret = PAM_SERVICE_ERR;
803 return pam_winbind_request_log(ctx, ret, username, fn);
804 }
805
806 ret = wbc_error_to_pam_error(status);
807 return pam_winbind_request_log(ctx, ret, username, fn);
808}
809
810#if defined(HAVE_PAM_RADIO_TYPE)
811static bool _pam_winbind_change_pwd(struct pwb_context *ctx)
812{
813 struct pam_message msg, *pmsg;
814 struct pam_response *resp = NULL;
815 const char *prompt;
816 int ret;
817 bool retval = false;
818 prompt = _("Do you want to change your password now?");
819 pmsg = &msg;
820 msg.msg_style = PAM_RADIO_TYPE;
821 msg.msg = prompt;
822 ret = converse(ctx->pamh, 1, &pmsg, &resp);
823 if (resp == NULL) {
824 if (ret == PAM_SUCCESS) {
825 _pam_log(ctx, LOG_CRIT, "pam_winbind: system error!\n");
826 return false;
827 }
828 }
829 if (ret != PAM_SUCCESS) {
830 return false;
831 }
832 _pam_log(ctx, LOG_CRIT, "Received [%s] reply from application.\n", resp->resp);
833
[738]834 if ((resp->resp != NULL) && (strcasecmp(resp->resp, "yes") == 0)) {
[736]835 retval = true;
836 }
837
838 _pam_drop_reply(resp, 1);
839 return retval;
840}
841#else
842static bool _pam_winbind_change_pwd(struct pwb_context *ctx)
843{
844 return false;
845}
846#endif
847
848/**
849 * send a password expiry message if required
850 *
851 * @param ctx PAM winbind context.
852 * @param next_change expected (calculated) next expiry date.
853 * @param already_expired pointer to a boolean to indicate if the password is
854 * already expired.
855 *
856 * @return boolean Returns true if message has been sent, false if not.
857 */
858
859static bool _pam_send_password_expiry_message(struct pwb_context *ctx,
860 time_t next_change,
861 time_t now,
862 int warn_pwd_expire,
863 bool *already_expired,
864 bool *change_pwd)
865{
866 int days = 0;
867 struct tm tm_now, tm_next_change;
868 bool retval = false;
869 int ret;
870
871 if (already_expired) {
872 *already_expired = false;
873 }
874
875 if (change_pwd) {
876 *change_pwd = false;
877 }
878
879 if (next_change <= now) {
880 PAM_WB_REMARK_DIRECT(ctx, "NT_STATUS_PASSWORD_EXPIRED");
881 if (already_expired) {
882 *already_expired = true;
883 }
884 return true;
885 }
886
887 if ((next_change < 0) ||
888 (next_change > now + warn_pwd_expire * SECONDS_PER_DAY)) {
889 return false;
890 }
891
892 if ((localtime_r(&now, &tm_now) == NULL) ||
893 (localtime_r(&next_change, &tm_next_change) == NULL)) {
894 return false;
895 }
896
897 days = (tm_next_change.tm_yday+tm_next_change.tm_year*365) -
898 (tm_now.tm_yday+tm_now.tm_year*365);
899
900 if (days == 0) {
901 ret = _make_remark(ctx, PAM_TEXT_INFO,
902 _("Your password expires today.\n"));
903
904 /*
905 * If change_pwd and already_expired is null.
906 * We are just sending a notification message.
907 * We don't expect any response in this case.
908 */
909
910 if (!change_pwd && !already_expired) {
911 return true;
912 }
913
914 /*
915 * successfully sent the warning message.
916 * Give the user a chance to change pwd.
917 */
918 if (ret == PAM_SUCCESS) {
919 if (change_pwd) {
920 retval = _pam_winbind_change_pwd(ctx);
921 if (retval) {
922 *change_pwd = true;
923 }
924 }
925 }
926 return true;
927 }
928
929 if (days > 0 && days < warn_pwd_expire) {
930
931 ret = _make_remark_format(ctx, PAM_TEXT_INFO,
932 _("Your password will expire in %d %s.\n"),
933 days, (days > 1) ? _("days"):_("day"));
934 /*
935 * If change_pwd and already_expired is null.
936 * We are just sending a notification message.
937 * We don't expect any response in this case.
938 */
939
940 if (!change_pwd && !already_expired) {
941 return true;
942 }
943
944 /*
945 * successfully sent the warning message.
946 * Give the user a chance to change pwd.
947 */
948 if (ret == PAM_SUCCESS) {
949 if (change_pwd) {
950 retval = _pam_winbind_change_pwd(ctx);
951 if (retval) {
952 *change_pwd = true;
953 }
954 }
955 }
956 return true;
957 }
958
959 return false;
960}
961
962/**
963 * Send a warning if the password expires in the near future
964 *
965 * @param ctx PAM winbind context.
966 * @param response The full authentication response structure.
967 * @param already_expired boolean, is the pwd already expired?
968 *
969 * @return void.
970 */
971
972static void _pam_warn_password_expiry(struct pwb_context *ctx,
973 const struct wbcAuthUserInfo *info,
974 const struct wbcUserPasswordPolicyInfo *policy,
975 int warn_pwd_expire,
976 bool *already_expired,
977 bool *change_pwd)
978{
979 time_t now = time(NULL);
980 time_t next_change = 0;
981
982 if (!info || !policy) {
983 return;
984 }
985
986 if (already_expired) {
987 *already_expired = false;
988 }
989
990 if (change_pwd) {
991 *change_pwd = false;
992 }
993
994 /* accounts with WBC_ACB_PWNOEXP set never receive a warning */
995 if (info->acct_flags & WBC_ACB_PWNOEXP) {
996 return;
997 }
998
999 /* no point in sending a warning if this is a grace logon */
1000 if (PAM_WB_GRACE_LOGON(info->user_flags)) {
1001 return;
1002 }
1003
1004 /* check if the info3 must change timestamp has been set */
1005 next_change = info->pass_must_change_time;
1006
1007 if (_pam_send_password_expiry_message(ctx, next_change, now,
1008 warn_pwd_expire,
1009 already_expired,
1010 change_pwd)) {
1011 return;
1012 }
1013
1014 /* now check for the global password policy */
1015 /* good catch from Ralf Haferkamp: an expiry of "never" is translated
1016 * to -1 */
1017 if ((policy->expire == (int64_t)-1) ||
1018 (policy->expire == 0)) {
1019 return;
1020 }
1021
1022 next_change = info->pass_last_set_time + policy->expire;
1023
1024 if (_pam_send_password_expiry_message(ctx, next_change, now,
1025 warn_pwd_expire,
1026 already_expired,
1027 change_pwd)) {
1028 return;
1029 }
1030
1031 /* no warning sent */
1032}
1033
1034#define IS_SID_STRING(name) (strncmp("S-", name, 2) == 0)
1035
1036/**
1037 * Append a string, making sure not to overflow and to always return a
1038 * NULL-terminated string.
1039 *
1040 * @param dest Destination string buffer (must already be NULL-terminated).
1041 * @param src Source string buffer.
1042 * @param dest_buffer_size Size of dest buffer in bytes.
1043 *
1044 * @return false if dest buffer is not big enough (no bytes copied), true on
1045 * success.
1046 */
1047
1048static bool safe_append_string(char *dest,
1049 const char *src,
1050 int dest_buffer_size)
1051{
1052 int dest_length = strlen(dest);
1053 int src_length = strlen(src);
1054
1055 if (dest_length + src_length + 1 > dest_buffer_size) {
1056 return false;
1057 }
1058
1059 memcpy(dest + dest_length, src, src_length + 1);
1060 return true;
1061}
1062
1063/**
1064 * Convert a names into a SID string, appending it to a buffer.
1065 *
1066 * @param ctx PAM winbind context.
1067 * @param user User in PAM request.
1068 * @param name Name to convert.
1069 * @param sid_list_buffer Where to append the string sid.
1070 * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1071 *
1072 * @return false on failure, true on success.
1073 */
1074static bool winbind_name_to_sid_string(struct pwb_context *ctx,
1075 const char *user,
1076 const char *name,
1077 char *sid_list_buffer,
1078 int sid_list_buffer_size)
1079{
1080 const char* sid_string = NULL;
1081 char *sid_str = NULL;
1082
1083 /* lookup name? */
1084 if (IS_SID_STRING(name)) {
1085 sid_string = name;
1086 } else {
1087 wbcErr wbc_status;
1088 struct wbcDomainSid sid;
1089 enum wbcSidType type;
1090
1091 _pam_log_debug(ctx, LOG_DEBUG,
1092 "no sid given, looking up: %s\n", name);
1093
1094 wbc_status = wbcLookupName("", name, &sid, &type);
1095 if (!WBC_ERROR_IS_OK(wbc_status)) {
1096 _pam_log(ctx, LOG_INFO,
1097 "could not lookup name: %s\n", name);
1098 return false;
1099 }
1100
1101 wbc_status = wbcSidToString(&sid, &sid_str);
1102 if (!WBC_ERROR_IS_OK(wbc_status)) {
1103 return false;
1104 }
1105
1106 sid_string = sid_str;
1107 }
1108
1109 if (!safe_append_string(sid_list_buffer, sid_string,
1110 sid_list_buffer_size)) {
1111 wbcFreeMemory(sid_str);
1112 return false;
1113 }
1114
1115 wbcFreeMemory(sid_str);
1116 return true;
1117}
1118
1119/**
1120 * Convert a list of names into a list of sids.
1121 *
1122 * @param ctx PAM winbind context.
1123 * @param user User in PAM request.
1124 * @param name_list List of names or string sids, separated by commas.
1125 * @param sid_list_buffer Where to put the list of string sids.
1126 * @param sid_list_buffer Size of sid_list_buffer (in bytes).
1127 *
1128 * @return false on failure, true on success.
1129 */
1130static bool winbind_name_list_to_sid_string_list(struct pwb_context *ctx,
1131 const char *user,
1132 const char *name_list,
1133 char *sid_list_buffer,
1134 int sid_list_buffer_size)
1135{
1136 bool result = false;
1137 char *current_name = NULL;
1138 const char *search_location;
1139 const char *comma;
1140 int len;
1141
1142 if (sid_list_buffer_size > 0) {
1143 sid_list_buffer[0] = 0;
1144 }
1145
1146 search_location = name_list;
1147 while ((comma = strstr(search_location, ",")) != NULL) {
1148 current_name = strndup(search_location,
1149 comma - search_location);
1150 if (NULL == current_name) {
1151 goto out;
1152 }
1153
1154 if (!winbind_name_to_sid_string(ctx, user,
1155 current_name,
1156 sid_list_buffer,
1157 sid_list_buffer_size)) {
1158 /*
1159 * If one group name failed, we must not fail
1160 * the authentication totally, continue with
1161 * the following group names. If user belongs to
1162 * one of the valid groups, we must allow it
1163 * login. -- BoYang
1164 */
1165
1166 _pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
1167 "check if group %s is valid group.", current_name,
1168 current_name);
1169 _make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
1170 "to sid, please contact your administrator to see "
1171 "if group %s is valid."), current_name, current_name);
1172 SAFE_FREE(current_name);
1173 search_location = comma + 1;
1174 continue;
1175 }
1176
1177 SAFE_FREE(current_name);
1178
1179 if (!safe_append_string(sid_list_buffer, ",",
1180 sid_list_buffer_size)) {
1181 goto out;
1182 }
1183
1184 search_location = comma + 1;
1185 }
1186
1187 if (!winbind_name_to_sid_string(ctx, user, search_location,
1188 sid_list_buffer,
1189 sid_list_buffer_size)) {
1190 _pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
1191 "check if group %s is valid group.", search_location,
1192 search_location);
1193 _make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
1194 "to sid, please contact your administrator to see "
1195 "if group %s is valid."), search_location, search_location);
1196 /*
1197 * The lookup of the last name failed..
1198 * It results in require_member_of_sid ends with ','
1199 * It is malformated parameter here, overwrite the last ','.
1200 */
1201 len = strlen(sid_list_buffer);
1202 if (len) {
1203 if (sid_list_buffer[len - 1] == ',') {
1204 sid_list_buffer[len - 1] = '\0';
1205 }
1206 }
1207 }
1208
1209 result = true;
1210
1211out:
1212 SAFE_FREE(current_name);
1213 return result;
1214}
1215
1216/**
1217 * put krb5ccname variable into environment
1218 *
1219 * @param ctx PAM winbind context.
1220 * @param krb5ccname env variable retrieved from winbindd.
1221 *
1222 * @return void.
1223 */
1224
1225static void _pam_setup_krb5_env(struct pwb_context *ctx,
1226 struct wbcLogonUserInfo *info)
1227{
1228 char var[PATH_MAX];
1229 int ret;
1230 uint32_t i;
1231 const char *krb5ccname = NULL;
1232
1233 if (off(ctx->ctrl, WINBIND_KRB5_AUTH)) {
1234 return;
1235 }
1236
1237 if (!info) {
1238 return;
1239 }
1240
1241 for (i=0; i < info->num_blobs; i++) {
1242 if (strcasecmp(info->blobs[i].name, "krb5ccname") == 0) {
1243 krb5ccname = (const char *)info->blobs[i].blob.data;
1244 break;
1245 }
1246 }
1247
1248 if (!krb5ccname || (strlen(krb5ccname) == 0)) {
1249 return;
1250 }
1251
1252 _pam_log_debug(ctx, LOG_DEBUG,
1253 "request returned KRB5CCNAME: %s", krb5ccname);
1254
1255 if (snprintf(var, sizeof(var), "KRB5CCNAME=%s", krb5ccname) == -1) {
1256 return;
1257 }
1258
1259 ret = pam_putenv(ctx->pamh, var);
1260 if (ret) {
1261 _pam_log(ctx, LOG_ERR,
1262 "failed to set KRB5CCNAME to %s: %s",
1263 var, pam_strerror(ctx->pamh, ret));
1264 }
1265}
1266
1267/**
1268 * Copy unix username if available (further processed in PAM).
1269 *
1270 * @param ctx PAM winbind context
1271 * @param user_ret A pointer that holds a pointer to a string
1272 * @param unix_username A username
1273 *
1274 * @return void.
1275 */
1276
1277static void _pam_setup_unix_username(struct pwb_context *ctx,
1278 char **user_ret,
1279 struct wbcLogonUserInfo *info)
1280{
1281 const char *unix_username = NULL;
1282 uint32_t i;
1283
1284 if (!user_ret || !info) {
1285 return;
1286 }
1287
1288 for (i=0; i < info->num_blobs; i++) {
1289 if (strcasecmp(info->blobs[i].name, "unix_username") == 0) {
1290 unix_username = (const char *)info->blobs[i].blob.data;
1291 break;
1292 }
1293 }
1294
1295 if (!unix_username || !unix_username[0]) {
1296 return;
1297 }
1298
1299 *user_ret = strdup(unix_username);
1300}
1301
1302/**
1303 * Set string into the PAM stack.
1304 *
1305 * @param ctx PAM winbind context.
1306 * @param data_name Key name for pam_set_data.
1307 * @param value String value.
1308 *
1309 * @return void.
1310 */
1311
1312static void _pam_set_data_string(struct pwb_context *ctx,
1313 const char *data_name,
1314 const char *value)
1315{
1316 int ret;
1317
1318 if (!data_name || !value || (strlen(data_name) == 0) ||
1319 (strlen(value) == 0)) {
1320 return;
1321 }
1322
1323 ret = pam_set_data(ctx->pamh, data_name, talloc_strdup(NULL, value),
1324 _pam_winbind_cleanup_func);
1325 if (ret) {
1326 _pam_log_debug(ctx, LOG_DEBUG,
1327 "Could not set data %s: %s\n",
1328 data_name, pam_strerror(ctx->pamh, ret));
1329 }
1330}
1331
1332/**
1333 * Set info3 strings into the PAM stack.
1334 *
1335 * @param ctx PAM winbind context.
1336 * @param data_name Key name for pam_set_data.
1337 * @param value String value.
1338 *
1339 * @return void.
1340 */
1341
1342static void _pam_set_data_info3(struct pwb_context *ctx,
1343 const struct wbcAuthUserInfo *info)
1344{
1345 _pam_set_data_string(ctx, PAM_WINBIND_HOMEDIR,
1346 info->home_directory);
1347 _pam_set_data_string(ctx, PAM_WINBIND_LOGONSCRIPT,
1348 info->logon_script);
1349 _pam_set_data_string(ctx, PAM_WINBIND_LOGONSERVER,
1350 info->logon_server);
1351 _pam_set_data_string(ctx, PAM_WINBIND_PROFILEPATH,
1352 info->profile_path);
1353}
1354
1355/**
1356 * Free info3 strings in the PAM stack.
1357 *
1358 * @param pamh PAM handle
1359 *
1360 * @return void.
1361 */
1362
1363static void _pam_free_data_info3(pam_handle_t *pamh)
1364{
1365 pam_set_data(pamh, PAM_WINBIND_HOMEDIR, NULL, NULL);
1366 pam_set_data(pamh, PAM_WINBIND_LOGONSCRIPT, NULL, NULL);
1367 pam_set_data(pamh, PAM_WINBIND_LOGONSERVER, NULL, NULL);
1368 pam_set_data(pamh, PAM_WINBIND_PROFILEPATH, NULL, NULL);
1369}
1370
1371/**
1372 * Send PAM_ERROR_MSG for cached or grace logons.
1373 *
1374 * @param ctx PAM winbind context.
1375 * @param username User in PAM request.
1376 * @param info3_user_flgs Info3 flags containing logon type bits.
1377 *
1378 * @return void.
1379 */
1380
1381static void _pam_warn_logon_type(struct pwb_context *ctx,
1382 const char *username,
1383 uint32_t info3_user_flgs)
1384{
1385 /* inform about logon type */
1386 if (PAM_WB_GRACE_LOGON(info3_user_flgs)) {
1387
1388 _make_remark(ctx, PAM_ERROR_MSG,
1389 _("Grace login. "
1390 "Please change your password as soon you're "
1391 "online again"));
1392 _pam_log_debug(ctx, LOG_DEBUG,
1393 "User %s logged on using grace logon\n",
1394 username);
1395
1396 } else if (PAM_WB_CACHED_LOGON(info3_user_flgs)) {
1397
1398 _make_remark(ctx, PAM_ERROR_MSG,
1399 _("Domain Controller unreachable, "
1400 "using cached credentials instead. "
1401 "Network resources may be unavailable"));
1402 _pam_log_debug(ctx, LOG_DEBUG,
1403 "User %s logged on using cached credentials\n",
1404 username);
1405 }
1406}
1407
1408/**
1409 * Send PAM_ERROR_MSG for krb5 errors.
1410 *
1411 * @param ctx PAM winbind context.
1412 * @param username User in PAM request.
1413 * @param info3_user_flgs Info3 flags containing logon type bits.
1414 *
1415 * @return void.
1416 */
1417
1418static void _pam_warn_krb5_failure(struct pwb_context *ctx,
1419 const char *username,
1420 uint32_t info3_user_flgs)
1421{
1422 if (PAM_WB_KRB5_CLOCK_SKEW(info3_user_flgs)) {
1423 _make_remark(ctx, PAM_ERROR_MSG,
1424 _("Failed to establish your Kerberos Ticket cache "
1425 "due time differences\n"
1426 "with the domain controller. "
1427 "Please verify the system time.\n"));
1428 _pam_log_debug(ctx, LOG_DEBUG,
1429 "User %s: Clock skew when getting Krb5 TGT\n",
1430 username);
1431 }
1432}
1433
1434static bool _pam_check_remark_auth_err(struct pwb_context *ctx,
1435 const struct wbcAuthErrorInfo *e,
1436 const char *nt_status_string,
1437 int *pam_error)
1438{
1439 const char *ntstatus = NULL;
1440 const char *error_string = NULL;
1441
1442 if (!e || !pam_error) {
1443 return false;
1444 }
1445
1446 ntstatus = e->nt_string;
1447 if (!ntstatus) {
1448 return false;
1449 }
1450
1451 if (strcasecmp(ntstatus, nt_status_string) == 0) {
1452
1453 error_string = _get_ntstatus_error_string(nt_status_string);
1454 if (error_string) {
1455 _make_remark(ctx, PAM_ERROR_MSG, error_string);
1456 *pam_error = e->pam_error;
1457 return true;
1458 }
1459
1460 if (e->display_string) {
1461 _make_remark(ctx, PAM_ERROR_MSG, e->display_string);
1462 *pam_error = e->pam_error;
1463 return true;
1464 }
1465
1466 _make_remark(ctx, PAM_ERROR_MSG, nt_status_string);
1467 *pam_error = e->pam_error;
1468
1469 return true;
1470 }
1471
1472 return false;
1473};
1474
1475/**
1476 * Compose Password Restriction String for a PAM_ERROR_MSG conversation.
1477 *
1478 * @param i The wbcUserPasswordPolicyInfo struct.
1479 *
1480 * @return string (caller needs to talloc_free).
1481 */
1482
1483static char *_pam_compose_pwd_restriction_string(struct pwb_context *ctx,
1484 struct wbcUserPasswordPolicyInfo *i)
1485{
1486 char *str = NULL;
1487
1488 if (!i) {
1489 goto failed;
1490 }
1491
1492 str = talloc_asprintf(ctx, _("Your password "));
1493 if (!str) {
1494 goto failed;
1495 }
1496
1497 if (i->min_length_password > 0) {
1498 str = talloc_asprintf_append(str,
1499 _("must be at least %d characters; "),
1500 i->min_length_password);
1501 if (!str) {
1502 goto failed;
1503 }
1504 }
1505
1506 if (i->password_history > 0) {
1507 str = talloc_asprintf_append(str,
1508 _("cannot repeat any of your previous %d "
1509 "passwords; "),
1510 i->password_history);
1511 if (!str) {
1512 goto failed;
1513 }
1514 }
1515
1516 if (i->password_properties & WBC_DOMAIN_PASSWORD_COMPLEX) {
1517 str = talloc_asprintf_append(str,
1518 _("must contain capitals, numerals "
1519 "or punctuation; "
1520 "and cannot contain your account "
1521 "or full name; "));
1522 if (!str) {
1523 goto failed;
1524 }
1525 }
1526
1527 str = talloc_asprintf_append(str,
1528 _("Please type a different password. "
1529 "Type a password which meets these requirements in "
1530 "both text boxes."));
1531 if (!str) {
1532 goto failed;
1533 }
1534
1535 return str;
1536
1537 failed:
1538 TALLOC_FREE(str);
1539 return NULL;
1540}
1541
1542static int _pam_create_homedir(struct pwb_context *ctx,
1543 const char *dirname,
1544 mode_t mode)
1545{
1546 struct stat sbuf;
1547
1548 if (stat(dirname, &sbuf) == 0) {
1549 return PAM_SUCCESS;
1550 }
1551
1552 if (mkdir(dirname, mode) != 0) {
1553
1554 _make_remark_format(ctx, PAM_TEXT_INFO,
1555 _("Creating directory: %s failed: %s"),
1556 dirname, strerror(errno));
1557 _pam_log(ctx, LOG_ERR, "could not create dir: %s (%s)",
1558 dirname, strerror(errno));
1559 return PAM_PERM_DENIED;
1560 }
1561
1562 return PAM_SUCCESS;
1563}
1564
1565static int _pam_chown_homedir(struct pwb_context *ctx,
1566 const char *dirname,
1567 uid_t uid,
1568 gid_t gid)
1569{
1570 if (chown(dirname, uid, gid) != 0) {
1571 _pam_log(ctx, LOG_ERR, "failed to chown user homedir: %s (%s)",
1572 dirname, strerror(errno));
1573 return PAM_PERM_DENIED;
1574 }
1575
1576 return PAM_SUCCESS;
1577}
1578
1579static int _pam_mkhomedir(struct pwb_context *ctx)
1580{
1581 struct passwd *pwd = NULL;
1582 char *token = NULL;
1583 char *create_dir = NULL;
1584 char *user_dir = NULL;
1585 int ret;
1586 const char *username;
1587 mode_t mode = 0700;
1588 char *safe_ptr = NULL;
1589 char *p = NULL;
1590
1591 /* Get the username */
1592 ret = pam_get_user(ctx->pamh, &username, NULL);
1593 if ((ret != PAM_SUCCESS) || (!username)) {
1594 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1595 return PAM_SERVICE_ERR;
1596 }
1597
1598 pwd = getpwnam(username);
1599 if (pwd == NULL) {
1600 _pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
1601 return PAM_USER_UNKNOWN;
1602 }
1603 _pam_log_debug(ctx, LOG_DEBUG, "homedir is: %s", pwd->pw_dir);
1604
1605 ret = _pam_create_homedir(ctx, pwd->pw_dir, 0700);
1606 if (ret == PAM_SUCCESS) {
1607 ret = _pam_chown_homedir(ctx, pwd->pw_dir,
1608 pwd->pw_uid,
1609 pwd->pw_gid);
1610 }
1611
1612 if (ret == PAM_SUCCESS) {
1613 return ret;
1614 }
1615
1616 /* maybe we need to create parent dirs */
1617 create_dir = talloc_strdup(ctx, "/");
1618 if (!create_dir) {
1619 return PAM_BUF_ERR;
1620 }
1621
1622 /* find final directory */
1623 user_dir = strrchr(pwd->pw_dir, '/');
1624 if (!user_dir) {
1625 return PAM_BUF_ERR;
1626 }
1627 user_dir++;
1628
1629 _pam_log(ctx, LOG_DEBUG, "final directory: %s", user_dir);
1630
1631 p = pwd->pw_dir;
1632
1633 while ((token = strtok_r(p, "/", &safe_ptr)) != NULL) {
1634
1635 mode = 0755;
1636
1637 p = NULL;
1638
1639 _pam_log_debug(ctx, LOG_DEBUG, "token is %s", token);
1640
1641 create_dir = talloc_asprintf_append(create_dir, "%s/", token);
1642 if (!create_dir) {
1643 return PAM_BUF_ERR;
1644 }
1645 _pam_log_debug(ctx, LOG_DEBUG, "current_dir is %s", create_dir);
1646
1647 if (strcmp(token, user_dir) == 0) {
1648 _pam_log_debug(ctx, LOG_DEBUG, "assuming last directory: %s", token);
1649 mode = 0700;
1650 }
1651
1652 ret = _pam_create_homedir(ctx, create_dir, mode);
1653 if (ret) {
1654 return ret;
1655 }
1656 }
1657
1658 return _pam_chown_homedir(ctx, create_dir,
1659 pwd->pw_uid,
1660 pwd->pw_gid);
1661}
1662
1663/* talk to winbindd */
1664static int winbind_auth_request(struct pwb_context *ctx,
1665 const char *user,
1666 const char *pass,
1667 const char *member,
1668 const char *cctype,
1669 const int warn_pwd_expire,
1670 struct wbcAuthErrorInfo **p_error,
1671 struct wbcLogonUserInfo **p_info,
1672 struct wbcUserPasswordPolicyInfo **p_policy,
1673 time_t *pwd_last_set,
1674 char **user_ret)
1675{
1676 wbcErr wbc_status;
1677
1678 struct wbcLogonUserParams logon;
1679 char membership_of[1024];
1680 uid_t user_uid = -1;
1681 uint32_t flags = WBFLAG_PAM_INFO3_TEXT |
1682 WBFLAG_PAM_GET_PWD_POLICY;
1683
1684 struct wbcLogonUserInfo *info = NULL;
1685 struct wbcAuthUserInfo *user_info = NULL;
1686 struct wbcAuthErrorInfo *error = NULL;
1687 struct wbcUserPasswordPolicyInfo *policy = NULL;
1688
1689 int ret = PAM_AUTH_ERR;
1690 int i;
1691 const char *codes[] = {
1692 "NT_STATUS_PASSWORD_EXPIRED",
1693 "NT_STATUS_PASSWORD_MUST_CHANGE",
1694 "NT_STATUS_INVALID_WORKSTATION",
1695 "NT_STATUS_INVALID_LOGON_HOURS",
1696 "NT_STATUS_ACCOUNT_EXPIRED",
1697 "NT_STATUS_ACCOUNT_DISABLED",
1698 "NT_STATUS_ACCOUNT_LOCKED_OUT",
1699 "NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
1700 "NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
1701 "NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
1702 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1703 "NT_STATUS_NO_LOGON_SERVERS",
1704 "NT_STATUS_WRONG_PASSWORD",
1705 "NT_STATUS_ACCESS_DENIED"
1706 };
1707
1708 if (pwd_last_set) {
1709 *pwd_last_set = 0;
1710 }
1711
1712 /* Krb5 auth always has to go against the KDC of the user's realm */
1713
1714 if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1715 flags |= WBFLAG_PAM_CONTACT_TRUSTDOM;
1716 }
1717
1718 if (ctx->ctrl & (WINBIND_KRB5_AUTH|WINBIND_CACHED_LOGIN)) {
1719 struct passwd *pwd = NULL;
1720
1721 pwd = getpwnam(user);
1722 if (pwd == NULL) {
1723 return PAM_USER_UNKNOWN;
1724 }
1725 user_uid = pwd->pw_uid;
1726 }
1727
1728 if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1729
1730 _pam_log_debug(ctx, LOG_DEBUG,
1731 "enabling krb5 login flag\n");
1732
1733 flags |= WBFLAG_PAM_KRB5 |
1734 WBFLAG_PAM_FALLBACK_AFTER_KRB5;
1735 }
1736
1737 if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1738 _pam_log_debug(ctx, LOG_DEBUG,
1739 "enabling cached login flag\n");
1740 flags |= WBFLAG_PAM_CACHED_LOGIN;
1741 }
1742
1743 if (user_ret) {
1744 *user_ret = NULL;
1745 flags |= WBFLAG_PAM_UNIX_NAME;
1746 }
1747
1748 if (cctype != NULL) {
1749 _pam_log_debug(ctx, LOG_DEBUG,
1750 "enabling request for a %s krb5 ccache\n",
1751 cctype);
1752 }
1753
1754 if (member != NULL) {
1755
1756 ZERO_STRUCT(membership_of);
1757
1758 if (!winbind_name_list_to_sid_string_list(ctx, user, member,
1759 membership_of,
1760 sizeof(membership_of))) {
1761 _pam_log_debug(ctx, LOG_ERR,
1762 "failed to serialize membership of sid "
1763 "\"%s\"\n", member);
1764 return PAM_AUTH_ERR;
1765 }
1766 }
1767
1768 ZERO_STRUCT(logon);
1769
1770 logon.username = user;
1771 logon.password = pass;
1772
1773 if (cctype) {
1774 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1775 &logon.blobs,
1776 "krb5_cc_type",
1777 0,
1778 (uint8_t *)cctype,
1779 strlen(cctype)+1);
1780 if (!WBC_ERROR_IS_OK(wbc_status)) {
1781 goto done;
1782 }
1783 }
1784
1785 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1786 &logon.blobs,
1787 "flags",
1788 0,
1789 (uint8_t *)&flags,
1790 sizeof(flags));
1791 if (!WBC_ERROR_IS_OK(wbc_status)) {
1792 goto done;
1793 }
1794
1795 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1796 &logon.blobs,
1797 "user_uid",
1798 0,
1799 (uint8_t *)&user_uid,
1800 sizeof(user_uid));
1801 if (!WBC_ERROR_IS_OK(wbc_status)) {
1802 goto done;
1803 }
1804
1805 if (member) {
1806 wbc_status = wbcAddNamedBlob(&logon.num_blobs,
1807 &logon.blobs,
1808 "membership_of",
1809 0,
1810 (uint8_t *)membership_of,
1811 sizeof(membership_of));
1812 if (!WBC_ERROR_IS_OK(wbc_status)) {
1813 goto done;
1814 }
1815 }
1816
1817 wbc_status = wbcLogonUser(&logon, &info, &error, &policy);
1818 ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1819 user, "wbcLogonUser");
1820 wbcFreeMemory(logon.blobs);
1821 logon.blobs = NULL;
1822
1823 if (info && info->info) {
1824 user_info = info->info;
1825 }
1826
1827 if (pwd_last_set && user_info) {
1828 *pwd_last_set = user_info->pass_last_set_time;
1829 }
1830
1831 if (p_info && info) {
1832 *p_info = info;
1833 }
1834
1835 if (p_policy && policy) {
1836 *p_policy = policy;
1837 }
1838
1839 if (p_error && error) {
1840 /* We want to process the error in the caller. */
1841 *p_error = error;
1842 return ret;
1843 }
1844
1845 for (i=0; i<ARRAY_SIZE(codes); i++) {
1846 int _ret = ret;
1847 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1848 ret = _ret;
1849 goto done;
1850 }
1851 }
1852
1853 if ((ret == PAM_SUCCESS) && user_info && policy && info) {
1854
1855 bool already_expired = false;
1856 bool change_pwd = false;
1857
1858 /* warn a user if the password is about to expire soon */
1859 _pam_warn_password_expiry(ctx, user_info, policy,
1860 warn_pwd_expire,
1861 &already_expired,
1862 &change_pwd);
1863
1864 if (already_expired == true) {
1865
1866 SMB_TIME_T last_set = user_info->pass_last_set_time;
1867
1868 _pam_log_debug(ctx, LOG_DEBUG,
1869 "Password has expired "
1870 "(Password was last set: %lld, "
1871 "the policy says it should expire here "
1872 "%lld (now it's: %ld))\n",
1873 (long long int)last_set,
1874 (long long int)last_set +
1875 policy->expire,
1876 (long)time(NULL));
1877
1878 return PAM_AUTHTOK_EXPIRED;
1879 }
1880
1881 if (change_pwd) {
1882 ret = PAM_NEW_AUTHTOK_REQD;
1883 goto done;
1884 }
1885
1886 /* inform about logon type */
1887 _pam_warn_logon_type(ctx, user, user_info->user_flags);
1888
1889 /* inform about krb5 failures */
1890 _pam_warn_krb5_failure(ctx, user, user_info->user_flags);
1891
1892 /* set some info3 info for other modules in the stack */
1893 _pam_set_data_info3(ctx, user_info);
1894
1895 /* put krb5ccname into env */
1896 _pam_setup_krb5_env(ctx, info);
1897
1898 /* If winbindd returned a username, return the pointer to it
1899 * here. */
1900 _pam_setup_unix_username(ctx, user_ret, info);
1901 }
1902
1903 done:
1904 if (logon.blobs) {
1905 wbcFreeMemory(logon.blobs);
1906 }
1907 if (info && info->blobs && !p_info) {
1908 wbcFreeMemory(info->blobs);
1909 }
1910 if (error && !p_error) {
1911 wbcFreeMemory(error);
1912 }
1913 if (info && !p_info) {
1914 wbcFreeMemory(info);
1915 }
1916 if (policy && !p_policy) {
1917 wbcFreeMemory(policy);
1918 }
1919
1920 return ret;
1921}
1922
1923/* talk to winbindd */
1924static int winbind_chauthtok_request(struct pwb_context *ctx,
1925 const char *user,
1926 const char *oldpass,
1927 const char *newpass,
1928 time_t pwd_last_set)
1929{
1930 wbcErr wbc_status;
1931 struct wbcChangePasswordParams params;
1932 struct wbcAuthErrorInfo *error = NULL;
1933 struct wbcUserPasswordPolicyInfo *policy = NULL;
1934 enum wbcPasswordChangeRejectReason reject_reason = -1;
1935 uint32_t flags = 0;
1936
1937 int i;
1938 const char *codes[] = {
1939 "NT_STATUS_BACKUP_CONTROLLER",
1940 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
1941 "NT_STATUS_NO_LOGON_SERVERS",
1942 "NT_STATUS_ACCESS_DENIED",
1943 "NT_STATUS_PWD_TOO_SHORT", /* TODO: tell the min pwd length ? */
1944 "NT_STATUS_PWD_TOO_RECENT", /* TODO: tell the minage ? */
1945 "NT_STATUS_PWD_HISTORY_CONFLICT" /* TODO: tell the history length ? */
1946 };
1947 int ret = PAM_AUTH_ERR;
1948
1949 ZERO_STRUCT(params);
1950
1951 if (ctx->ctrl & WINBIND_KRB5_AUTH) {
1952 flags |= WBFLAG_PAM_KRB5 |
1953 WBFLAG_PAM_CONTACT_TRUSTDOM;
1954 }
1955
1956 if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
1957 flags |= WBFLAG_PAM_CACHED_LOGIN;
1958 }
1959
1960 params.account_name = user;
1961 params.level = WBC_AUTH_USER_LEVEL_PLAIN;
1962 params.old_password.plaintext = oldpass;
1963 params.new_password.plaintext = newpass;
1964 params.flags = flags;
1965
1966 wbc_status = wbcChangeUserPasswordEx(&params, &error, &reject_reason, &policy);
1967 ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
1968 user, "wbcChangeUserPasswordEx");
1969
1970 if (WBC_ERROR_IS_OK(wbc_status)) {
1971 _pam_log(ctx, LOG_NOTICE,
1972 "user '%s' password changed", user);
1973 return PAM_SUCCESS;
1974 }
1975
1976 if (!error) {
1977 wbcFreeMemory(policy);
1978 return ret;
1979 }
1980
1981 for (i=0; i<ARRAY_SIZE(codes); i++) {
1982 int _ret = ret;
1983 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
1984 ret = _ret;
1985 goto done;
1986 }
1987 }
1988
1989 if (!strcasecmp(error->nt_string,
1990 "NT_STATUS_PASSWORD_RESTRICTION")) {
1991
1992 char *pwd_restriction_string = NULL;
1993 SMB_TIME_T min_pwd_age = 0;
1994
1995 if (policy) {
1996 min_pwd_age = policy->min_passwordage;
1997 }
1998
1999 /* FIXME: avoid to send multiple PAM messages after another */
2000 switch (reject_reason) {
2001 case -1:
2002 break;
2003 case WBC_PWD_CHANGE_REJECT_OTHER:
2004 if ((min_pwd_age > 0) &&
2005 (pwd_last_set + min_pwd_age > time(NULL))) {
2006 PAM_WB_REMARK_DIRECT(ctx,
2007 "NT_STATUS_PWD_TOO_RECENT");
2008 }
2009 break;
2010 case WBC_PWD_CHANGE_REJECT_TOO_SHORT:
2011 PAM_WB_REMARK_DIRECT(ctx,
2012 "NT_STATUS_PWD_TOO_SHORT");
2013 break;
2014 case WBC_PWD_CHANGE_REJECT_IN_HISTORY:
2015 PAM_WB_REMARK_DIRECT(ctx,
2016 "NT_STATUS_PWD_HISTORY_CONFLICT");
2017 break;
2018 case WBC_PWD_CHANGE_REJECT_COMPLEXITY:
2019 _make_remark(ctx, PAM_ERROR_MSG,
2020 _("Password does not meet "
2021 "complexity requirements"));
2022 break;
2023 default:
2024 _pam_log_debug(ctx, LOG_DEBUG,
2025 "unknown password change "
2026 "reject reason: %d",
2027 reject_reason);
2028 break;
2029 }
2030
2031 pwd_restriction_string =
2032 _pam_compose_pwd_restriction_string(ctx, policy);
2033 if (pwd_restriction_string) {
2034 _make_remark(ctx, PAM_ERROR_MSG,
2035 pwd_restriction_string);
2036 TALLOC_FREE(pwd_restriction_string);
2037 }
2038 }
2039 done:
2040 wbcFreeMemory(error);
2041 wbcFreeMemory(policy);
2042
2043 return ret;
2044}
2045
2046/*
2047 * Checks if a user has an account
2048 *
2049 * return values:
2050 * 1 = User not found
2051 * 0 = OK
2052 * -1 = System error
2053 */
2054static int valid_user(struct pwb_context *ctx,
2055 const char *user)
2056{
2057 /* check not only if the user is available over NSS calls, also make
2058 * sure it's really a winbind user, this is important when stacking PAM
2059 * modules in the 'account' or 'password' facility. */
2060
2061 wbcErr wbc_status;
2062 struct passwd *pwd = NULL;
2063 struct passwd *wb_pwd = NULL;
2064
2065 pwd = getpwnam(user);
2066 if (pwd == NULL) {
2067 return 1;
2068 }
2069
2070 wbc_status = wbcGetpwnam(user, &wb_pwd);
2071 wbcFreeMemory(wb_pwd);
2072 if (!WBC_ERROR_IS_OK(wbc_status)) {
2073 _pam_log(ctx, LOG_DEBUG, "valid_user: wbcGetpwnam gave %s\n",
2074 wbcErrorString(wbc_status));
2075 }
2076
2077 switch (wbc_status) {
2078 case WBC_ERR_UNKNOWN_USER:
2079 return 1;
2080 case WBC_ERR_SUCCESS:
2081 return 0;
2082 default:
2083 break;
2084 }
2085 return -1;
2086}
2087
2088static char *_pam_delete(register char *xx)
2089{
2090 _pam_overwrite(xx);
2091 _pam_drop(xx);
2092 return NULL;
2093}
2094
2095/*
2096 * obtain a password from the user
2097 */
2098
2099static int _winbind_read_password(struct pwb_context *ctx,
2100 unsigned int ctrl,
2101 const char *comment,
2102 const char *prompt1,
2103 const char *prompt2,
2104 const char **pass)
2105{
2106 int authtok_flag;
2107 int retval;
2108 const char *item;
2109 char *token;
2110
2111 _pam_log(ctx, LOG_DEBUG, "getting password (0x%08x)", ctrl);
2112
2113 /*
2114 * make sure nothing inappropriate gets returned
2115 */
2116
2117 *pass = token = NULL;
2118
2119 /*
2120 * which authentication token are we getting?
2121 */
2122
2123 if (on(WINBIND__OLD_PASSWORD, ctrl)) {
2124 authtok_flag = PAM_OLDAUTHTOK;
2125 } else {
2126 authtok_flag = PAM_AUTHTOK;
2127 }
2128
2129 /*
2130 * should we obtain the password from a PAM item ?
2131 */
2132
2133 if (on(WINBIND_TRY_FIRST_PASS_ARG, ctrl) ||
2134 on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2135 retval = _pam_get_item(ctx->pamh, authtok_flag, &item);
2136 if (retval != PAM_SUCCESS) {
2137 /* very strange. */
2138 _pam_log(ctx, LOG_ALERT,
2139 "pam_get_item returned error "
2140 "to unix-read-password");
2141 return retval;
2142 } else if (item != NULL) { /* we have a password! */
2143 *pass = item;
2144 item = NULL;
2145 _pam_log(ctx, LOG_DEBUG,
2146 "pam_get_item returned a password");
2147 return PAM_SUCCESS;
2148 } else if (on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
2149 return PAM_AUTHTOK_RECOVER_ERR; /* didn't work */
2150 } else if (on(WINBIND_USE_AUTHTOK_ARG, ctrl)
2151 && off(WINBIND__OLD_PASSWORD, ctrl)) {
2152 return PAM_AUTHTOK_RECOVER_ERR;
2153 }
2154 }
2155 /*
2156 * getting here implies we will have to get the password from the
2157 * user directly.
2158 */
2159
2160 {
2161 struct pam_message msg[3], *pmsg[3];
2162 struct pam_response *resp;
2163 int i, replies;
2164
2165 /* prepare to converse */
2166
2167 if (comment != NULL && off(ctrl, WINBIND_SILENT)) {
2168 pmsg[0] = &msg[0];
2169 msg[0].msg_style = PAM_TEXT_INFO;
2170 msg[0].msg = discard_const_p(char, comment);
2171 i = 1;
2172 } else {
2173 i = 0;
2174 }
2175
2176 pmsg[i] = &msg[i];
2177 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2178 msg[i++].msg = discard_const_p(char, prompt1);
2179 replies = 1;
2180
2181 if (prompt2 != NULL) {
2182 pmsg[i] = &msg[i];
2183 msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
2184 msg[i++].msg = discard_const_p(char, prompt2);
2185 ++replies;
2186 }
2187 /* so call the conversation expecting i responses */
2188 resp = NULL;
2189 retval = converse(ctx->pamh, i, pmsg, &resp);
2190 if (resp == NULL) {
2191 if (retval == PAM_SUCCESS) {
2192 retval = PAM_AUTHTOK_RECOVER_ERR;
2193 }
2194 goto done;
2195 }
2196 if (retval != PAM_SUCCESS) {
2197 _pam_drop_reply(resp, i);
2198 goto done;
2199 }
2200
2201 /* interpret the response */
2202
2203 token = x_strdup(resp[i - replies].resp);
2204 if (!token) {
2205 _pam_log(ctx, LOG_NOTICE,
2206 "could not recover "
2207 "authentication token");
2208 retval = PAM_AUTHTOK_RECOVER_ERR;
2209 goto done;
2210 }
2211
2212 if (replies == 2) {
2213 /* verify that password entered correctly */
2214 if (!resp[i - 1].resp ||
2215 strcmp(token, resp[i - 1].resp)) {
2216 _pam_delete(token); /* mistyped */
2217 retval = PAM_AUTHTOK_RECOVER_ERR;
2218 _make_remark(ctx, PAM_ERROR_MSG,
2219 MISTYPED_PASS);
2220 }
2221 }
2222
2223 /*
2224 * tidy up the conversation (resp_retcode) is ignored
2225 * -- what is it for anyway? AGM
2226 */
2227 _pam_drop_reply(resp, i);
2228 }
2229
2230 done:
2231 if (retval != PAM_SUCCESS) {
2232 _pam_log_debug(ctx, LOG_DEBUG,
2233 "unable to obtain a password");
2234 return retval;
2235 }
2236 /* 'token' is the entered password */
2237
2238 /* we store this password as an item */
2239
2240 retval = pam_set_item(ctx->pamh, authtok_flag, token);
2241 _pam_delete(token); /* clean it up */
2242 if (retval != PAM_SUCCESS ||
2243 (retval = _pam_get_item(ctx->pamh, authtok_flag, &item)) != PAM_SUCCESS) {
2244
2245 _pam_log(ctx, LOG_CRIT, "error manipulating password");
2246 return retval;
2247
2248 }
2249
2250 *pass = item;
2251 item = NULL; /* break link to password */
2252
2253 return PAM_SUCCESS;
2254}
2255
2256static const char *get_conf_item_string(struct pwb_context *ctx,
2257 const char *item,
2258 int config_flag)
2259{
2260 int i = 0;
2261 const char *parm_opt = NULL;
2262
2263 if (!(ctx->ctrl & config_flag)) {
2264 goto out;
2265 }
2266
2267 /* let the pam opt take precedence over the pam_winbind.conf option */
2268 for (i=0; i<ctx->argc; i++) {
2269
2270 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2271 char *p;
2272
2273 if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2274 _pam_log(ctx, LOG_INFO,
2275 "no \"=\" delimiter for \"%s\" found\n",
2276 item);
2277 goto out;
2278 }
2279 _pam_log_debug(ctx, LOG_INFO,
2280 "PAM config: %s '%s'\n", item, p+1);
2281 return p + 1;
2282 }
2283 }
2284
2285 if (ctx->dict) {
2286 char *key = NULL;
2287
2288 key = talloc_asprintf(ctx, "global:%s", item);
2289 if (!key) {
2290 goto out;
2291 }
2292
2293 parm_opt = iniparser_getstring(ctx->dict, key, NULL);
2294 TALLOC_FREE(key);
2295
2296 _pam_log_debug(ctx, LOG_INFO, "CONFIG file: %s '%s'\n",
2297 item, parm_opt);
2298 }
2299out:
2300 return parm_opt;
2301}
2302
2303static int get_config_item_int(struct pwb_context *ctx,
2304 const char *item,
2305 int config_flag)
2306{
2307 int i, parm_opt = -1;
2308
2309 if (!(ctx->ctrl & config_flag)) {
2310 goto out;
2311 }
2312
2313 /* let the pam opt take precedence over the pam_winbind.conf option */
2314 for (i = 0; i < ctx->argc; i++) {
2315
2316 if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
2317 char *p;
2318
2319 if ((p = strchr(ctx->argv[i], '=')) == NULL) {
2320 _pam_log(ctx, LOG_INFO,
2321 "no \"=\" delimiter for \"%s\" found\n",
2322 item);
2323 goto out;
2324 }
2325 parm_opt = atoi(p + 1);
2326 _pam_log_debug(ctx, LOG_INFO,
2327 "PAM config: %s '%d'\n",
2328 item, parm_opt);
2329 return parm_opt;
2330 }
2331 }
2332
2333 if (ctx->dict) {
2334 char *key = NULL;
2335
2336 key = talloc_asprintf(ctx, "global:%s", item);
2337 if (!key) {
2338 goto out;
2339 }
2340
2341 parm_opt = iniparser_getint(ctx->dict, key, -1);
2342 TALLOC_FREE(key);
2343
2344 _pam_log_debug(ctx, LOG_INFO,
2345 "CONFIG file: %s '%d'\n",
2346 item, parm_opt);
2347 }
2348out:
2349 return parm_opt;
2350}
2351
2352static const char *get_krb5_cc_type_from_config(struct pwb_context *ctx)
2353{
2354 return get_conf_item_string(ctx, "krb5_ccache_type",
2355 WINBIND_KRB5_CCACHE_TYPE);
2356}
2357
2358static const char *get_member_from_config(struct pwb_context *ctx)
2359{
2360 const char *ret = NULL;
2361 ret = get_conf_item_string(ctx, "require_membership_of",
2362 WINBIND_REQUIRED_MEMBERSHIP);
2363 if (ret) {
2364 return ret;
2365 }
2366 return get_conf_item_string(ctx, "require-membership-of",
2367 WINBIND_REQUIRED_MEMBERSHIP);
2368}
2369
2370static int get_warn_pwd_expire_from_config(struct pwb_context *ctx)
2371{
2372 int ret;
2373 ret = get_config_item_int(ctx, "warn_pwd_expire",
2374 WINBIND_WARN_PWD_EXPIRE);
2375 /* no or broken setting */
2376 if (ret <= 0) {
2377 return DEFAULT_DAYS_TO_WARN_BEFORE_PWD_EXPIRES;
2378 }
2379 return ret;
2380}
2381
2382/**
2383 * Retrieve the winbind separator.
2384 *
2385 * @param ctx PAM winbind context.
2386 *
2387 * @return string separator character. NULL on failure.
2388 */
2389
2390static char winbind_get_separator(struct pwb_context *ctx)
2391{
2392 wbcErr wbc_status;
2393 static struct wbcInterfaceDetails *details = NULL;
2394
2395 wbc_status = wbcInterfaceDetails(&details);
2396 if (!WBC_ERROR_IS_OK(wbc_status)) {
2397 _pam_log(ctx, LOG_ERR,
2398 "Could not retrieve winbind interface details: %s",
2399 wbcErrorString(wbc_status));
2400 return '\0';
2401 }
2402
2403 if (!details) {
2404 return '\0';
2405 }
2406
2407 return details->winbind_separator;
2408}
2409
2410
2411/**
2412 * Convert a upn to a name.
2413 *
2414 * @param ctx PAM winbind context.
2415 * @param upn USer UPN to be trabslated.
2416 *
2417 * @return converted name. NULL pointer on failure. Caller needs to free.
2418 */
2419
2420static char* winbind_upn_to_username(struct pwb_context *ctx,
2421 const char *upn)
2422{
2423 char sep;
2424 wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;
2425 struct wbcDomainSid sid;
2426 enum wbcSidType type;
2427 char *domain;
2428 char *name;
2429 char *p;
2430
2431 /* This cannot work when the winbind separator = @ */
2432
2433 sep = winbind_get_separator(ctx);
2434 if (!sep || sep == '@') {
2435 return NULL;
2436 }
2437
2438 name = talloc_strdup(ctx, upn);
2439 if (!name) {
2440 return NULL;
2441 }
2442 if ((p = strchr(name, '@')) != NULL) {
2443 *p = 0;
2444 domain = p + 1;
2445 }
2446
2447 /* Convert the UPN to a SID */
2448
2449 wbc_status = wbcLookupName(domain, name, &sid, &type);
2450 if (!WBC_ERROR_IS_OK(wbc_status)) {
2451 return NULL;
2452 }
2453
2454 /* Convert the the SID back to the sAMAccountName */
2455
2456 wbc_status = wbcLookupSid(&sid, &domain, &name, &type);
2457 if (!WBC_ERROR_IS_OK(wbc_status)) {
2458 return NULL;
2459 }
2460
2461 return talloc_asprintf(ctx, "%s\\%s", domain, name);
2462}
2463
2464static int _pam_delete_cred(pam_handle_t *pamh, int flags,
2465 int argc, const char **argv)
2466{
2467 int retval = PAM_SUCCESS;
2468 struct pwb_context *ctx = NULL;
2469 struct wbcLogoffUserParams logoff;
2470 struct wbcAuthErrorInfo *error = NULL;
2471 const char *user;
2472 wbcErr wbc_status = WBC_ERR_SUCCESS;
2473
2474 ZERO_STRUCT(logoff);
2475
2476 retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2477 if (retval) {
2478 goto out;
2479 }
2480
2481 _PAM_LOG_FUNCTION_ENTER("_pam_delete_cred", ctx);
2482
2483 if (ctx->ctrl & WINBIND_KRB5_AUTH) {
2484
2485 /* destroy the ccache here */
2486
2487 uint32_t wbc_flags = 0;
2488 const char *ccname = NULL;
2489 struct passwd *pwd = NULL;
2490
2491 retval = pam_get_user(pamh, &user, _("Username: "));
2492 if (retval) {
2493 _pam_log(ctx, LOG_ERR,
2494 "could not identify user");
2495 goto out;
2496 }
2497
2498 if (user == NULL) {
2499 _pam_log(ctx, LOG_ERR,
2500 "username was NULL!");
2501 retval = PAM_USER_UNKNOWN;
2502 goto out;
2503 }
2504
2505 _pam_log_debug(ctx, LOG_DEBUG,
2506 "username [%s] obtained", user);
2507
2508 ccname = pam_getenv(pamh, "KRB5CCNAME");
2509 if (ccname == NULL) {
2510 _pam_log_debug(ctx, LOG_DEBUG,
2511 "user has no KRB5CCNAME environment");
2512 }
2513
2514 pwd = getpwnam(user);
2515 if (pwd == NULL) {
2516 retval = PAM_USER_UNKNOWN;
2517 goto out;
2518 }
2519
2520 wbc_flags = WBFLAG_PAM_KRB5 |
2521 WBFLAG_PAM_CONTACT_TRUSTDOM;
2522
2523 logoff.username = user;
2524
2525 if (ccname) {
2526 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2527 &logoff.blobs,
2528 "ccfilename",
2529 0,
2530 (uint8_t *)ccname,
2531 strlen(ccname)+1);
2532 if (!WBC_ERROR_IS_OK(wbc_status)) {
2533 goto out;
2534 }
2535 }
2536
2537 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2538 &logoff.blobs,
2539 "flags",
2540 0,
2541 (uint8_t *)&wbc_flags,
2542 sizeof(wbc_flags));
2543 if (!WBC_ERROR_IS_OK(wbc_status)) {
2544 goto out;
2545 }
2546
2547 wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
2548 &logoff.blobs,
2549 "user_uid",
2550 0,
2551 (uint8_t *)&pwd->pw_uid,
2552 sizeof(pwd->pw_uid));
2553 if (!WBC_ERROR_IS_OK(wbc_status)) {
2554 goto out;
2555 }
2556
2557 wbc_status = wbcLogoffUserEx(&logoff, &error);
2558 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2559 user, "wbcLogoffUser");
2560 wbcFreeMemory(error);
2561 wbcFreeMemory(logoff.blobs);
2562 logoff.blobs = NULL;
2563
2564 if (!WBC_ERROR_IS_OK(wbc_status)) {
2565 _pam_log(ctx, LOG_INFO,
2566 "failed to logoff user %s: %s\n",
2567 user, wbcErrorString(wbc_status));
2568 }
2569 }
2570
2571out:
2572 if (logoff.blobs) {
2573 wbcFreeMemory(logoff.blobs);
2574 }
2575
2576 if (!WBC_ERROR_IS_OK(wbc_status)) {
2577 retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
2578 user, "wbcLogoffUser");
2579 }
2580
2581 /*
2582 * Delete the krb5 ccname variable from the PAM environment
2583 * if it was set by winbind.
2584 */
2585 if ((ctx->ctrl & WINBIND_KRB5_AUTH) && pam_getenv(pamh, "KRB5CCNAME")) {
2586 pam_putenv(pamh, "KRB5CCNAME");
2587 }
2588
2589 _PAM_LOG_FUNCTION_LEAVE("_pam_delete_cred", ctx, retval);
2590
2591 TALLOC_FREE(ctx);
2592
2593 return retval;
2594}
2595
2596PAM_EXTERN
2597int pam_sm_authenticate(pam_handle_t *pamh, int flags,
2598 int argc, const char **argv)
2599{
2600 const char *username;
2601 const char *password;
2602 const char *member = NULL;
2603 const char *cctype = NULL;
2604 int warn_pwd_expire;
2605 int retval = PAM_AUTH_ERR;
2606 char *username_ret = NULL;
2607 char *new_authtok_required = NULL;
2608 char *real_username = NULL;
2609 struct pwb_context *ctx = NULL;
2610
2611 retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2612 if (retval) {
2613 goto out;
2614 }
2615
2616 _PAM_LOG_FUNCTION_ENTER("pam_sm_authenticate", ctx);
2617
2618 /* Get the username */
2619 retval = pam_get_user(pamh, &username, NULL);
2620 if ((retval != PAM_SUCCESS) || (!username)) {
2621 _pam_log_debug(ctx, LOG_DEBUG,
2622 "can not get the username");
2623 retval = PAM_SERVICE_ERR;
2624 goto out;
2625 }
2626
2627
2628#if defined(AIX)
2629 /* Decode the user name since AIX does not support logn user
2630 names by default. The name is encoded as _#uid. */
2631
2632 if (username[0] == '_') {
2633 uid_t id = atoi(&username[1]);
2634 struct passwd *pw = NULL;
2635
2636 if ((id!=0) && ((pw = getpwuid(id)) != NULL)) {
2637 real_username = strdup(pw->pw_name);
2638 }
2639 }
2640#endif
2641
2642 if (!real_username) {
2643 /* Just making a copy of the username we got from PAM */
2644 if ((real_username = strdup(username)) == NULL) {
2645 _pam_log_debug(ctx, LOG_DEBUG,
2646 "memory allocation failure when copying "
2647 "username");
2648 retval = PAM_SERVICE_ERR;
2649 goto out;
2650 }
2651 }
2652
2653 /* Maybe this was a UPN */
2654
2655 if (strchr(real_username, '@') != NULL) {
2656 char *samaccountname = NULL;
2657
2658 samaccountname = winbind_upn_to_username(ctx,
2659 real_username);
2660 if (samaccountname) {
2661 free(real_username);
2662 real_username = strdup(samaccountname);
2663 }
2664 }
2665
2666 retval = _winbind_read_password(ctx, ctx->ctrl, NULL,
2667 _("Password: "), NULL,
2668 &password);
2669
2670 if (retval != PAM_SUCCESS) {
2671 _pam_log(ctx, LOG_ERR,
2672 "Could not retrieve user's password");
2673 retval = PAM_AUTHTOK_ERR;
2674 goto out;
2675 }
2676
2677 /* Let's not give too much away in the log file */
2678
2679#ifdef DEBUG_PASSWORD
2680 _pam_log_debug(ctx, LOG_INFO,
2681 "Verify user '%s' with password '%s'",
2682 real_username, password);
2683#else
2684 _pam_log_debug(ctx, LOG_INFO,
2685 "Verify user '%s'", real_username);
2686#endif
2687
2688 member = get_member_from_config(ctx);
2689 cctype = get_krb5_cc_type_from_config(ctx);
2690 warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
2691
2692 /* Now use the username to look up password */
2693 retval = winbind_auth_request(ctx, real_username, password,
2694 member, cctype, warn_pwd_expire,
2695 NULL, NULL, NULL,
2696 NULL, &username_ret);
2697
2698 if (retval == PAM_NEW_AUTHTOK_REQD ||
2699 retval == PAM_AUTHTOK_EXPIRED) {
2700
2701 char *new_authtok_required_during_auth = NULL;
2702
2703 new_authtok_required = talloc_asprintf(NULL, "%d", retval);
2704 if (!new_authtok_required) {
2705 retval = PAM_BUF_ERR;
2706 goto out;
2707 }
2708
2709 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2710 new_authtok_required,
2711 _pam_winbind_cleanup_func);
2712
2713 retval = PAM_SUCCESS;
2714
2715 new_authtok_required_during_auth = talloc_asprintf(NULL, "%d", true);
2716 if (!new_authtok_required_during_auth) {
2717 retval = PAM_BUF_ERR;
2718 goto out;
2719 }
2720
2721 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2722 new_authtok_required_during_auth,
2723 _pam_winbind_cleanup_func);
2724
2725 goto out;
2726 }
2727
2728out:
2729 if (username_ret) {
2730 pam_set_item (pamh, PAM_USER, username_ret);
2731 _pam_log_debug(ctx, LOG_INFO,
2732 "Returned user was '%s'", username_ret);
2733 free(username_ret);
2734 }
2735
2736 if (real_username) {
2737 free(real_username);
2738 }
2739
2740 if (!new_authtok_required) {
2741 pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, NULL, NULL);
2742 }
2743
2744 if (retval != PAM_SUCCESS) {
2745 _pam_free_data_info3(pamh);
2746 }
2747
2748 _PAM_LOG_FUNCTION_LEAVE("pam_sm_authenticate", ctx, retval);
2749
2750 TALLOC_FREE(ctx);
2751
2752 return retval;
2753}
2754
2755PAM_EXTERN
2756int pam_sm_setcred(pam_handle_t *pamh, int flags,
2757 int argc, const char **argv)
2758{
2759 int ret = PAM_SYSTEM_ERR;
2760 struct pwb_context *ctx = NULL;
2761
2762 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2763 if (ret) {
2764 goto out;
2765 }
2766
2767 _PAM_LOG_FUNCTION_ENTER("pam_sm_setcred", ctx);
2768
2769 switch (flags & ~PAM_SILENT) {
2770
2771 case PAM_DELETE_CRED:
2772 ret = _pam_delete_cred(pamh, flags, argc, argv);
2773 break;
2774 case PAM_REFRESH_CRED:
2775 _pam_log_debug(ctx, LOG_WARNING,
2776 "PAM_REFRESH_CRED not implemented");
2777 ret = PAM_SUCCESS;
2778 break;
2779 case PAM_REINITIALIZE_CRED:
2780 _pam_log_debug(ctx, LOG_WARNING,
2781 "PAM_REINITIALIZE_CRED not implemented");
2782 ret = PAM_SUCCESS;
2783 break;
2784 case PAM_ESTABLISH_CRED:
2785 _pam_log_debug(ctx, LOG_WARNING,
2786 "PAM_ESTABLISH_CRED not implemented");
2787 ret = PAM_SUCCESS;
2788 break;
2789 default:
2790 ret = PAM_SYSTEM_ERR;
2791 break;
2792 }
2793
2794 out:
2795
2796 _PAM_LOG_FUNCTION_LEAVE("pam_sm_setcred", ctx, ret);
2797
2798 TALLOC_FREE(ctx);
2799
2800 return ret;
2801}
2802
2803/*
2804 * Account management. We want to verify that the account exists
2805 * before returning PAM_SUCCESS
2806 */
2807PAM_EXTERN
2808int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
2809 int argc, const char **argv)
2810{
2811 const char *username;
2812 int ret = PAM_USER_UNKNOWN;
2813 void *tmp = NULL;
2814 struct pwb_context *ctx = NULL;
2815
2816 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2817 if (ret) {
2818 goto out;
2819 }
2820
2821 _PAM_LOG_FUNCTION_ENTER("pam_sm_acct_mgmt", ctx);
2822
2823
2824 /* Get the username */
2825 ret = pam_get_user(pamh, &username, NULL);
2826 if ((ret != PAM_SUCCESS) || (!username)) {
2827 _pam_log_debug(ctx, LOG_DEBUG,
2828 "can not get the username");
2829 ret = PAM_SERVICE_ERR;
2830 goto out;
2831 }
2832
2833 /* Verify the username */
2834 ret = valid_user(ctx, username);
2835 switch (ret) {
2836 case -1:
2837 /* some sort of system error. The log was already printed */
2838 ret = PAM_SERVICE_ERR;
2839 goto out;
2840 case 1:
2841 /* the user does not exist */
2842 _pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
2843 username);
2844 if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
2845 ret = PAM_IGNORE;
2846 goto out;
2847 }
2848 ret = PAM_USER_UNKNOWN;
2849 goto out;
2850 case 0:
2851 pam_get_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
2852 (const void **)&tmp);
2853 if (tmp != NULL) {
2854 ret = atoi((const char *)tmp);
2855 switch (ret) {
2856 case PAM_AUTHTOK_EXPIRED:
2857 /* fall through, since new token is required in this case */
2858 case PAM_NEW_AUTHTOK_REQD:
2859 _pam_log(ctx, LOG_WARNING,
2860 "pam_sm_acct_mgmt success but %s is set",
2861 PAM_WINBIND_NEW_AUTHTOK_REQD);
2862 _pam_log(ctx, LOG_NOTICE,
2863 "user '%s' needs new password",
2864 username);
2865 /* PAM_AUTHTOKEN_REQD does not exist, but is documented in the manpage */
2866 ret = PAM_NEW_AUTHTOK_REQD;
2867 goto out;
2868 default:
2869 _pam_log(ctx, LOG_WARNING,
2870 "pam_sm_acct_mgmt success");
2871 _pam_log(ctx, LOG_NOTICE,
2872 "user '%s' granted access", username);
2873 ret = PAM_SUCCESS;
2874 goto out;
2875 }
2876 }
2877
2878 /* Otherwise, the authentication looked good */
2879 _pam_log(ctx, LOG_NOTICE,
2880 "user '%s' granted access", username);
2881 ret = PAM_SUCCESS;
2882 goto out;
2883 default:
2884 /* we don't know anything about this return value */
2885 _pam_log(ctx, LOG_ERR,
2886 "internal module error (ret = %d, user = '%s')",
2887 ret, username);
2888 ret = PAM_SERVICE_ERR;
2889 goto out;
2890 }
2891
2892 /* should not be reached */
2893 ret = PAM_IGNORE;
2894
2895 out:
2896
2897 _PAM_LOG_FUNCTION_LEAVE("pam_sm_acct_mgmt", ctx, ret);
2898
2899 TALLOC_FREE(ctx);
2900
2901 return ret;
2902}
2903
2904PAM_EXTERN
2905int pam_sm_open_session(pam_handle_t *pamh, int flags,
2906 int argc, const char **argv)
2907{
2908 int ret = PAM_SUCCESS;
2909 struct pwb_context *ctx = NULL;
2910
2911 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2912 if (ret) {
2913 goto out;
2914 }
2915
2916 _PAM_LOG_FUNCTION_ENTER("pam_sm_open_session", ctx);
2917
2918 if (ctx->ctrl & WINBIND_MKHOMEDIR) {
2919 /* check and create homedir */
2920 ret = _pam_mkhomedir(ctx);
2921 }
2922 out:
2923 _PAM_LOG_FUNCTION_LEAVE("pam_sm_open_session", ctx, ret);
2924
2925 TALLOC_FREE(ctx);
2926
2927 return ret;
2928}
2929
2930PAM_EXTERN
2931int pam_sm_close_session(pam_handle_t *pamh, int flags,
2932 int argc, const char **argv)
2933{
2934 int ret = PAM_SUCCESS;
2935 struct pwb_context *ctx = NULL;
2936
2937 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
2938 if (ret) {
2939 goto out;
2940 }
2941
2942 _PAM_LOG_FUNCTION_ENTER("pam_sm_close_session", ctx);
2943
2944out:
2945 _PAM_LOG_FUNCTION_LEAVE("pam_sm_close_session", ctx, ret);
2946
2947 TALLOC_FREE(ctx);
2948
2949 return ret;
2950}
2951
2952/**
2953 * evaluate whether we need to re-authenticate with kerberos after a
2954 * password change
2955 *
2956 * @param ctx PAM winbind context.
2957 * @param user The username
2958 *
2959 * @return boolean Returns true if required, false if not.
2960 */
2961
2962static bool _pam_require_krb5_auth_after_chauthtok(struct pwb_context *ctx,
2963 const char *user)
2964{
2965
2966 /* Make sure that we only do this if a) the chauthtok got initiated
2967 * during a logon attempt (authenticate->acct_mgmt->chauthtok) b) any
2968 * later password change via the "passwd" command if done by the user
2969 * itself
2970 * NB. If we login from gdm or xdm and the password expires,
2971 * we change the password, but there is no memory cache.
2972 * Thus, even for passthrough login, we should do the
2973 * authentication again to update memory cache.
2974 * --- BoYang
2975 * */
2976
2977 char *new_authtok_reqd_during_auth = NULL;
2978 struct passwd *pwd = NULL;
2979
2980 _pam_get_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2981 &new_authtok_reqd_during_auth);
2982 pam_set_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
2983 NULL, NULL);
2984
2985 if (new_authtok_reqd_during_auth) {
2986 return true;
2987 }
2988
2989 pwd = getpwnam(user);
2990 if (!pwd) {
2991 return false;
2992 }
2993
2994 if (getuid() == pwd->pw_uid) {
2995 return true;
2996 }
2997
2998 return false;
2999}
3000
3001
3002PAM_EXTERN
3003int pam_sm_chauthtok(pam_handle_t * pamh, int flags,
3004 int argc, const char **argv)
3005{
3006 unsigned int lctrl;
3007 int ret;
3008 bool cached_login = false;
3009
3010 /* <DO NOT free() THESE> */
3011 const char *user;
3012 char *pass_old, *pass_new;
3013 /* </DO NOT free() THESE> */
3014
3015 char *Announce;
3016
3017 int retry = 0;
3018 char *username_ret = NULL;
3019 struct wbcAuthErrorInfo *error = NULL;
3020 struct pwb_context *ctx = NULL;
3021
3022 ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
3023 if (ret) {
3024 goto out;
3025 }
3026
3027 _PAM_LOG_FUNCTION_ENTER("pam_sm_chauthtok", ctx);
3028
3029 cached_login = (ctx->ctrl & WINBIND_CACHED_LOGIN);
3030
3031 /* clearing offline bit for auth */
3032 ctx->ctrl &= ~WINBIND_CACHED_LOGIN;
3033
3034 /*
3035 * First get the name of a user
3036 */
3037 ret = pam_get_user(pamh, &user, _("Username: "));
3038 if (ret) {
3039 _pam_log(ctx, LOG_ERR,
3040 "password - could not identify user");
3041 goto out;
3042 }
3043
3044 if (user == NULL) {
3045 _pam_log(ctx, LOG_ERR, "username was NULL!");
3046 ret = PAM_USER_UNKNOWN;
3047 goto out;
3048 }
3049
3050 _pam_log_debug(ctx, LOG_DEBUG, "username [%s] obtained", user);
3051
3052 /* check if this is really a user in winbindd, not only in NSS */
3053 ret = valid_user(ctx, user);
3054 switch (ret) {
3055 case 1:
3056 ret = PAM_USER_UNKNOWN;
3057 goto out;
3058 case -1:
3059 ret = PAM_SYSTEM_ERR;
3060 goto out;
3061 default:
3062 break;
3063 }
3064
3065 /*
3066 * obtain and verify the current password (OLDAUTHTOK) for
3067 * the user.
3068 */
3069
3070 if (flags & PAM_PRELIM_CHECK) {
3071 time_t pwdlastset_prelim = 0;
3072
3073 /* instruct user what is happening */
3074
3075#define greeting _("Changing password for")
3076 Announce = talloc_asprintf(ctx, "%s %s", greeting, user);
3077 if (!Announce) {
3078 _pam_log(ctx, LOG_CRIT,
3079 "password - out of memory");
3080 ret = PAM_BUF_ERR;
3081 goto out;
3082 }
3083#undef greeting
3084
3085 lctrl = ctx->ctrl | WINBIND__OLD_PASSWORD;
3086 ret = _winbind_read_password(ctx, lctrl,
3087 Announce,
3088 _("(current) NT password: "),
3089 NULL,
3090 (const char **) &pass_old);
3091 TALLOC_FREE(Announce);
3092 if (ret != PAM_SUCCESS) {
3093 _pam_log(ctx, LOG_NOTICE,
3094 "password - (old) token not obtained");
3095 goto out;
3096 }
3097
3098 /* verify that this is the password for this user */
3099
3100 ret = winbind_auth_request(ctx, user, pass_old,
3101 NULL, NULL, 0,
3102 &error, NULL, NULL,
3103 &pwdlastset_prelim, NULL);
3104
3105 if (ret != PAM_ACCT_EXPIRED &&
3106 ret != PAM_AUTHTOK_EXPIRED &&
3107 ret != PAM_NEW_AUTHTOK_REQD &&
3108 ret != PAM_SUCCESS) {
3109 pass_old = NULL;
3110 goto out;
3111 }
3112
3113 pam_set_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3114 (void *)pwdlastset_prelim, NULL);
3115
3116 ret = pam_set_item(pamh, PAM_OLDAUTHTOK,
3117 (const void *) pass_old);
3118 pass_old = NULL;
3119 if (ret != PAM_SUCCESS) {
3120 _pam_log(ctx, LOG_CRIT,
3121 "failed to set PAM_OLDAUTHTOK");
3122 }
3123 } else if (flags & PAM_UPDATE_AUTHTOK) {
3124
3125 time_t pwdlastset_update = 0;
3126
3127 /*
3128 * obtain the proposed password
3129 */
3130
3131 /*
3132 * get the old token back.
3133 */
3134
3135 ret = _pam_get_item(pamh, PAM_OLDAUTHTOK, &pass_old);
3136
3137 if (ret != PAM_SUCCESS) {
3138 _pam_log(ctx, LOG_NOTICE,
3139 "user not authenticated");
3140 goto out;
3141 }
3142
3143 lctrl = ctx->ctrl & ~WINBIND_TRY_FIRST_PASS_ARG;
3144
3145 if (on(WINBIND_USE_AUTHTOK_ARG, lctrl)) {
3146 lctrl |= WINBIND_USE_FIRST_PASS_ARG;
3147 }
3148 retry = 0;
3149 ret = PAM_AUTHTOK_ERR;
3150 while ((ret != PAM_SUCCESS) && (retry++ < MAX_PASSWD_TRIES)) {
3151 /*
3152 * use_authtok is to force the use of a previously entered
3153 * password -- needed for pluggable password strength checking
3154 */
3155
3156 ret = _winbind_read_password(ctx, lctrl,
3157 NULL,
3158 _("Enter new NT password: "),
3159 _("Retype new NT password: "),
3160 (const char **)&pass_new);
3161
3162 if (ret != PAM_SUCCESS) {
3163 _pam_log_debug(ctx, LOG_ALERT,
3164 "password - "
3165 "new password not obtained");
3166 pass_old = NULL;/* tidy up */
3167 goto out;
3168 }
3169
3170 /*
3171 * At this point we know who the user is and what they
3172 * propose as their new password. Verify that the new
3173 * password is acceptable.
3174 */
3175
3176 if (pass_new[0] == '\0') {/* "\0" password = NULL */
3177 pass_new = NULL;
3178 }
3179 }
3180
3181 /*
3182 * By reaching here we have approved the passwords and must now
3183 * rebuild the password database file.
3184 */
3185 _pam_get_data(pamh, PAM_WINBIND_PWD_LAST_SET,
3186 &pwdlastset_update);
3187
3188 /*
3189 * if cached creds were enabled, make sure to set the
3190 * WINBIND_CACHED_LOGIN bit here in order to have winbindd
3191 * update the cached creds storage - gd
3192 */
3193 if (cached_login) {
3194 ctx->ctrl |= WINBIND_CACHED_LOGIN;
3195 }
3196
3197 ret = winbind_chauthtok_request(ctx, user, pass_old,
3198 pass_new, pwdlastset_update);
3199 if (ret) {
3200 pass_old = pass_new = NULL;
3201 goto out;
3202 }
3203
3204 if (_pam_require_krb5_auth_after_chauthtok(ctx, user)) {
3205
3206 const char *member = NULL;
3207 const char *cctype = NULL;
3208 int warn_pwd_expire;
3209 struct wbcLogonUserInfo *info = NULL;
3210 struct wbcUserPasswordPolicyInfo *policy = NULL;
3211
3212 member = get_member_from_config(ctx);
3213 cctype = get_krb5_cc_type_from_config(ctx);
3214 warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
3215
3216 /* Keep WINBIND_CACHED_LOGIN bit for
3217 * authentication after changing the password.
3218 * This will update the cached credentials in case
3219 * that winbindd_dual_pam_chauthtok() fails
3220 * to update them.
3221 * --- BoYang
3222 * */
3223
3224 ret = winbind_auth_request(ctx, user, pass_new,
3225 member, cctype, 0,
3226 &error, &info, &policy,
3227 NULL, &username_ret);
3228 pass_old = pass_new = NULL;
3229
3230 if (ret == PAM_SUCCESS) {
3231
3232 struct wbcAuthUserInfo *user_info = NULL;
3233
3234 if (info && info->info) {
3235 user_info = info->info;
3236 }
3237
3238 /* warn a user if the password is about to
3239 * expire soon */
3240 _pam_warn_password_expiry(ctx, user_info, policy,
3241 warn_pwd_expire,
3242 NULL, NULL);
3243
3244 /* set some info3 info for other modules in the
3245 * stack */
3246 _pam_set_data_info3(ctx, user_info);
3247
3248 /* put krb5ccname into env */
3249 _pam_setup_krb5_env(ctx, info);
3250
3251 if (username_ret) {
3252 pam_set_item(pamh, PAM_USER,
3253 username_ret);
3254 _pam_log_debug(ctx, LOG_INFO,
3255 "Returned user was '%s'",
3256 username_ret);
3257 free(username_ret);
3258 }
3259
3260 }
3261
3262 if (info && info->blobs) {
3263 wbcFreeMemory(info->blobs);
3264 }
3265 wbcFreeMemory(info);
3266 wbcFreeMemory(policy);
3267
3268 goto out;
3269 }
3270 } else {
3271 ret = PAM_SERVICE_ERR;
3272 }
3273
3274out:
3275 {
3276 /* Deal with offline errors. */
3277 int i;
3278 const char *codes[] = {
3279 "NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
3280 "NT_STATUS_NO_LOGON_SERVERS",
3281 "NT_STATUS_ACCESS_DENIED"
3282 };
3283
3284 for (i=0; i<ARRAY_SIZE(codes); i++) {
3285 int _ret;
3286 if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
3287 break;
3288 }
3289 }
3290 }
3291
3292 wbcFreeMemory(error);
3293
3294 _PAM_LOG_FUNCTION_LEAVE("pam_sm_chauthtok", ctx, ret);
3295
3296 TALLOC_FREE(ctx);
3297
3298 return ret;
3299}
3300
3301#ifdef PAM_STATIC
3302
3303/* static module data */
3304
3305struct pam_module _pam_winbind_modstruct = {
3306 MODULE_NAME,
3307 pam_sm_authenticate,
3308 pam_sm_setcred,
3309 pam_sm_acct_mgmt,
3310 pam_sm_open_session,
3311 pam_sm_close_session,
3312 pam_sm_chauthtok
3313};
3314
3315#endif
3316
3317/*
3318 * Copyright (c) Andrew Tridgell <tridge@samba.org> 2000
3319 * Copyright (c) Tim Potter <tpot@samba.org> 2000
3320 * Copyright (c) Andrew Bartlettt <abartlet@samba.org> 2002
3321 * Copyright (c) Guenther Deschner <gd@samba.org> 2005-2008
3322 * Copyright (c) Jan Rêkorajski 1999.
3323 * Copyright (c) Andrew G. Morgan 1996-8.
3324 * Copyright (c) Alex O. Yuriev, 1996.
3325 * Copyright (c) Cristian Gafton 1996.
3326 * Copyright (C) Elliot Lee <sopwith@redhat.com> 1996, Red Hat Software.
3327 *
3328 * Redistribution and use in source and binary forms, with or without
3329 * modification, are permitted provided that the following conditions
3330 * are met:
3331 * 1. Redistributions of source code must retain the above copyright
3332 * notice, and the entire permission notice in its entirety,
3333 * including the disclaimer of warranties.
3334 * 2. Redistributions in binary form must reproduce the above copyright
3335 * notice, this list of conditions and the following disclaimer in the
3336 * documentation and/or other materials provided with the distribution.
3337 * 3. The name of the author may not be used to endorse or promote
3338 * products derived from this software without specific prior
3339 * written permission.
3340 *
3341 * ALTERNATIVELY, this product may be distributed under the terms of
3342 * the GNU Public License, in which case the provisions of the GPL are
3343 * required INSTEAD OF the above restrictions. (This clause is
3344 * necessary due to a potential bad interaction between the GPL and
3345 * the restrictions contained in a BSD-style copyright.)
3346 *
3347 * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
3348 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
3349 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
3350 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
3351 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
3352 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
3353 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
3354 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
3355 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
3356 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
3357 * OF THE POSSIBILITY OF SUCH DAMAGE.
3358 */
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