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