809a913d6c7f5a2c320eea9ab68151aa23d57751
[idra/samba.git] / source3 / smbd / password.c
1 /*
2    Unix SMB/CIFS implementation.
3    Password and authentication handling
4    Copyright (C) Andrew Tridgell 1992-1998
5    Copyright (C) Jeremy Allison 2007.
6
7    This program is free software; you can redistribute it and/or modify
8    it under the terms of the GNU General Public License as published by
9    the Free Software Foundation; either version 3 of the License, or
10    (at your option) any later version.
11
12    This program is distributed in the hope that it will be useful,
13    but WITHOUT ANY WARRANTY; without even the implied warranty of
14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15    GNU General Public License for more details.
16
17    You should have received a copy of the GNU General Public License
18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
19 */
20
21 #include "includes.h"
22 #include "smbd/globals.h"
23
24 enum server_allocated_state { SERVER_ALLOCATED_REQUIRED_YES,
25                                 SERVER_ALLOCATED_REQUIRED_NO,
26                                 SERVER_ALLOCATED_REQUIRED_ANY};
27
28 static user_struct *get_valid_user_struct_internal(
29                         struct smbd_server_connection *sconn,
30                         uint16 vuid,
31                         enum server_allocated_state server_allocated)
32 {
33         user_struct *usp;
34         int count=0;
35
36         if (vuid == UID_FIELD_INVALID)
37                 return NULL;
38
39         usp=sconn->smb1.sessions.validated_users;
40         for (;usp;usp=usp->next,count++) {
41                 if (vuid == usp->vuid) {
42                         switch (server_allocated) {
43                                 case SERVER_ALLOCATED_REQUIRED_YES:
44                                         if (usp->server_info == NULL) {
45                                                 continue;
46                                         }
47                                         break;
48                                 case SERVER_ALLOCATED_REQUIRED_NO:
49                                         if (usp->server_info != NULL) {
50                                                 continue;
51                                         }
52                                 case SERVER_ALLOCATED_REQUIRED_ANY:
53                                         break;
54                         }
55                         if (count > 10) {
56                                 DLIST_PROMOTE(sconn->smb1.sessions.validated_users,
57                                               usp);
58                         }
59                         return usp;
60                 }
61         }
62
63         return NULL;
64 }
65
66 /****************************************************************************
67  Check if a uid has been validated, and return an pointer to the user_struct
68  if it has. NULL if not. vuid is biased by an offset. This allows us to
69  tell random client vuid's (normally zero) from valid vuids.
70 ****************************************************************************/
71
72 user_struct *get_valid_user_struct(struct smbd_server_connection *sconn,
73                                    uint16 vuid)
74 {
75         return get_valid_user_struct_internal(sconn, vuid,
76                         SERVER_ALLOCATED_REQUIRED_YES);
77 }
78
79 bool is_partial_auth_vuid(struct smbd_server_connection *sconn, uint16 vuid)
80 {
81         return (get_partial_auth_user_struct(sconn, vuid) != NULL);
82 }
83
84 /****************************************************************************
85  Get the user struct of a partial NTLMSSP login
86 ****************************************************************************/
87
88 user_struct *get_partial_auth_user_struct(struct smbd_server_connection *sconn,
89                                           uint16 vuid)
90 {
91         return get_valid_user_struct_internal(sconn, vuid,
92                         SERVER_ALLOCATED_REQUIRED_NO);
93 }
94
95 /****************************************************************************
96  Invalidate a uid.
97 ****************************************************************************/
98
99 void invalidate_vuid(struct smbd_server_connection *sconn, uint16 vuid)
100 {
101         user_struct *vuser = NULL;
102
103         vuser = get_valid_user_struct_internal(sconn, vuid,
104                         SERVER_ALLOCATED_REQUIRED_ANY);
105         if (vuser == NULL) {
106                 return;
107         }
108
109         session_yield(vuser);
110
111         if (vuser->auth_ntlmssp_state) {
112                 auth_ntlmssp_end(&vuser->auth_ntlmssp_state);
113         }
114
115         DLIST_REMOVE(sconn->smb1.sessions.validated_users, vuser);
116
117         /* clear the vuid from the 'cache' on each connection, and
118            from the vuid 'owner' of connections */
119         conn_clear_vuid_caches(sconn, vuid);
120
121         TALLOC_FREE(vuser);
122         sconn->smb1.sessions.num_validated_vuids--;
123 }
124
125 /****************************************************************************
126  Invalidate all vuid entries for this process.
127 ****************************************************************************/
128
129 void invalidate_all_vuids(struct smbd_server_connection *sconn)
130 {
131         if (sconn->allow_smb2) {
132                 return;
133         }
134
135         while (sconn->smb1.sessions.validated_users != NULL) {
136                 invalidate_vuid(sconn,
137                                 sconn->smb1.sessions.validated_users->vuid);
138         }
139 }
140
141 static void increment_next_vuid(uint16_t *vuid)
142 {
143         *vuid += 1;
144
145         /* Check for vuid wrap. */
146         if (*vuid == UID_FIELD_INVALID) {
147                 *vuid = VUID_OFFSET;
148         }
149 }
150
151 /****************************************************
152  Create a new partial auth user struct.
153 *****************************************************/
154
155 int register_initial_vuid(struct smbd_server_connection *sconn)
156 {
157         user_struct *vuser;
158
159         /* Paranoia check. */
160         if(lp_security() == SEC_SHARE) {
161                 smb_panic("register_initial_vuid: "
162                         "Tried to register uid in security=share");
163         }
164
165         /* Limit allowed vuids to 16bits - VUID_OFFSET. */
166         if (sconn->smb1.sessions.num_validated_vuids >= 0xFFFF-VUID_OFFSET) {
167                 return UID_FIELD_INVALID;
168         }
169
170         if((vuser = talloc_zero(NULL, user_struct)) == NULL) {
171                 DEBUG(0,("register_initial_vuid: "
172                                 "Failed to talloc users struct!\n"));
173                 return UID_FIELD_INVALID;
174         }
175
176         /* Allocate a free vuid. Yes this is a linear search... */
177         while( get_valid_user_struct_internal(sconn,
178                         sconn->smb1.sessions.next_vuid,
179                         SERVER_ALLOCATED_REQUIRED_ANY) != NULL ) {
180                 increment_next_vuid(&sconn->smb1.sessions.next_vuid);
181         }
182
183         DEBUG(10,("register_initial_vuid: allocated vuid = %u\n",
184                 (unsigned int)sconn->smb1.sessions.next_vuid ));
185
186         vuser->vuid = sconn->smb1.sessions.next_vuid;
187
188         /*
189          * This happens in an unfinished NTLMSSP session setup. We
190          * need to allocate a vuid between the first and second calls
191          * to NTLMSSP.
192          */
193         increment_next_vuid(&sconn->smb1.sessions.next_vuid);
194         sconn->smb1.sessions.num_validated_vuids++;
195
196         DLIST_ADD(sconn->smb1.sessions.validated_users, vuser);
197         return vuser->vuid;
198 }
199
200 int register_homes_share(const char *username)
201 {
202         int result;
203         struct passwd *pwd;
204
205         result = lp_servicenumber(username);
206         if (result != -1) {
207                 DEBUG(3, ("Using static (or previously created) service for "
208                           "user '%s'; path = '%s'\n", username,
209                           lp_pathname(result)));
210                 return result;
211         }
212
213         pwd = getpwnam_alloc(talloc_tos(), username);
214
215         if ((pwd == NULL) || (pwd->pw_dir[0] == '\0')) {
216                 DEBUG(3, ("No home directory defined for user '%s'\n",
217                           username));
218                 TALLOC_FREE(pwd);
219                 return -1;
220         }
221
222         DEBUG(3, ("Adding homes service for user '%s' using home directory: "
223                   "'%s'\n", username, pwd->pw_dir));
224
225         result = add_home_service(username, username, pwd->pw_dir);
226
227         TALLOC_FREE(pwd);
228         return result;
229 }
230
231 /**
232  *  register that a valid login has been performed, establish 'session'.
233  *  @param server_info The token returned from the authentication process.
234  *   (now 'owned' by register_existing_vuid)
235  *
236  *  @param session_key The User session key for the login session (now also
237  *  'owned' by register_existing_vuid)
238  *
239  *  @param respose_blob The NT challenge-response, if available.  (May be
240  *  freed after this call)
241  *
242  *  @param smb_name The untranslated name of the user
243  *
244  *  @return Newly allocated vuid, biased by an offset. (This allows us to
245  *   tell random client vuid's (normally zero) from valid vuids.)
246  *
247  */
248
249 int register_existing_vuid(struct smbd_server_connection *sconn,
250                         uint16 vuid,
251                         struct auth_serversupplied_info *server_info,
252                         DATA_BLOB response_blob,
253                         const char *smb_name)
254 {
255         fstring tmp;
256         user_struct *vuser;
257
258         vuser = get_partial_auth_user_struct(sconn, vuid);
259         if (!vuser) {
260                 goto fail;
261         }
262
263         /* Use this to keep tabs on all our info from the authentication */
264         vuser->server_info = talloc_move(vuser, &server_info);
265
266         /* This is a potentially untrusted username */
267         alpha_strcpy(tmp, smb_name, ". _-$", sizeof(tmp));
268
269         vuser->server_info->sanitized_username = talloc_strdup(
270                 vuser->server_info, tmp);
271
272         DEBUG(10,("register_existing_vuid: (%u,%u) %s %s %s guest=%d\n",
273                   (unsigned int)vuser->server_info->utok.uid,
274                   (unsigned int)vuser->server_info->utok.gid,
275                   vuser->server_info->unix_name,
276                   vuser->server_info->sanitized_username,
277                   vuser->server_info->info3->base.domain.string,
278                   vuser->server_info->guest ));
279
280         DEBUG(3, ("register_existing_vuid: User name: %s\t"
281                   "Real name: %s\n", vuser->server_info->unix_name,
282                   vuser->server_info->info3->base.full_name.string));
283
284         if (!vuser->server_info->ptok) {
285                 DEBUG(1, ("register_existing_vuid: server_info does not "
286                         "contain a user_token - cannot continue\n"));
287                 goto fail;
288         }
289
290         DEBUG(3,("register_existing_vuid: UNIX uid %d is UNIX user %s, "
291                 "and will be vuid %u\n", (int)vuser->server_info->utok.uid,
292                  vuser->server_info->unix_name, vuser->vuid));
293
294         if (!session_claim(vuser)) {
295                 DEBUG(1, ("register_existing_vuid: Failed to claim session "
296                         "for vuid=%d\n",
297                         vuser->vuid));
298                 goto fail;
299         }
300
301         /* Register a home dir service for this user if
302         (a) This is not a guest connection,
303         (b) we have a home directory defined
304         (c) there s not an existing static share by that name
305         If a share exists by this name (autoloaded or not) reuse it . */
306
307         vuser->homes_snum = -1;
308
309         if (!vuser->server_info->guest) {
310                 vuser->homes_snum = register_homes_share(
311                         vuser->server_info->unix_name);
312         }
313
314         if (srv_is_signing_negotiated(smbd_server_conn) &&
315             !vuser->server_info->guest) {
316                 /* Try and turn on server signing on the first non-guest
317                  * sessionsetup. */
318                 srv_set_signing(smbd_server_conn,
319                                 vuser->server_info->user_session_key,
320                                 response_blob);
321         }
322
323         /* fill in the current_user_info struct */
324         set_current_user_info(
325                 vuser->server_info->sanitized_username,
326                 vuser->server_info->unix_name,
327                 vuser->server_info->info3->base.domain.string);
328
329         return vuser->vuid;
330
331   fail:
332
333         if (vuser) {
334                 invalidate_vuid(sconn, vuid);
335         }
336         return UID_FIELD_INVALID;
337 }
338
339 /****************************************************************************
340  Add a name to the session users list.
341 ****************************************************************************/
342
343 void add_session_user(struct smbd_server_connection *sconn,
344                       const char *user)
345 {
346         struct passwd *pw;
347         char *tmp;
348
349         pw = Get_Pwnam_alloc(talloc_tos(), user);
350
351         if (pw == NULL) {
352                 return;
353         }
354
355         if (sconn->smb1.sessions.session_userlist == NULL) {
356                 sconn->smb1.sessions.session_userlist = SMB_STRDUP(pw->pw_name);
357                 goto done;
358         }
359
360         if (in_list(pw->pw_name,sconn->smb1.sessions.session_userlist,false)) {
361                 goto done;
362         }
363
364         if (strlen(sconn->smb1.sessions.session_userlist) > 128 * 1024) {
365                 DEBUG(3,("add_session_user: session userlist already "
366                          "too large.\n"));
367                 goto done;
368         }
369
370         if (asprintf(&tmp, "%s %s",
371                      sconn->smb1.sessions.session_userlist, pw->pw_name) == -1) {
372                 DEBUG(3, ("asprintf failed\n"));
373                 goto done;
374         }
375
376         SAFE_FREE(sconn->smb1.sessions.session_userlist);
377         sconn->smb1.sessions.session_userlist = tmp;
378  done:
379         TALLOC_FREE(pw);
380 }
381
382 /****************************************************************************
383  In security=share mode we need to store the client workgroup, as that's
384   what Vista uses for the NTLMv2 calculation.
385 ****************************************************************************/
386
387 void add_session_workgroup(struct smbd_server_connection *sconn,
388                            const char *workgroup)
389 {
390         if (sconn->smb1.sessions.session_workgroup) {
391                 SAFE_FREE(sconn->smb1.sessions.session_workgroup);
392         }
393         sconn->smb1.sessions.session_workgroup = smb_xstrdup(workgroup);
394 }
395
396 /****************************************************************************
397  In security=share mode we need to return the client workgroup, as that's
398   what Vista uses for the NTLMv2 calculation.
399 ****************************************************************************/
400
401 const char *get_session_workgroup(struct smbd_server_connection *sconn)
402 {
403         return sconn->smb1.sessions.session_workgroup;
404 }
405
406 /****************************************************************************
407  Check if a user is in a netgroup user list. If at first we don't succeed,
408  try lower case.
409 ****************************************************************************/
410
411 bool user_in_netgroup(struct smbd_server_connection *sconn,
412                       const char *user, const char *ngname)
413 {
414 #ifdef HAVE_NETGROUP
415         fstring lowercase_user;
416
417         if (sconn->smb1.sessions.my_yp_domain == NULL) {
418                 yp_get_default_domain(&sconn->smb1.sessions.my_yp_domain);
419         }
420
421         if (sconn->smb1.sessions.my_yp_domain == NULL) {
422                 DEBUG(5,("Unable to get default yp domain, "
423                         "let's try without specifying it\n"));
424         }
425
426         DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
427                 user,
428                 sconn->smb1.sessions.my_yp_domain?
429                 sconn->smb1.sessions.my_yp_domain:"(ANY)",
430                 ngname));
431
432         if (innetgr(ngname, NULL, user, sconn->smb1.sessions.my_yp_domain)) {
433                 DEBUG(5,("user_in_netgroup: Found\n"));
434                 return true;
435         }
436
437         /*
438          * Ok, innetgr is case sensitive. Try once more with lowercase
439          * just in case. Attempt to fix #703. JRA.
440          */
441         fstrcpy(lowercase_user, user);
442         strlower_m(lowercase_user);
443
444         if (strcmp(user,lowercase_user) == 0) {
445                 /* user name was already lower case! */
446                 return false;
447         }
448
449         DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
450                 lowercase_user,
451                 sconn->smb1.sessions.my_yp_domain?
452                 sconn->smb1.sessions.my_yp_domain:"(ANY)",
453                 ngname));
454
455         if (innetgr(ngname, NULL, lowercase_user,
456                     sconn->smb1.sessions.my_yp_domain)) {
457                 DEBUG(5,("user_in_netgroup: Found\n"));
458                 return true;
459         }
460 #endif /* HAVE_NETGROUP */
461         return false;
462 }
463
464 /****************************************************************************
465  Check if a user is in a user list - can check combinations of UNIX
466  and netgroup lists.
467 ****************************************************************************/
468
469 bool user_in_list(struct smbd_server_connection *sconn,
470                   const char *user,const char **list)
471 {
472         if (!list || !*list)
473                 return False;
474
475         DEBUG(10,("user_in_list: checking user %s in list\n", user));
476
477         while (*list) {
478
479                 DEBUG(10,("user_in_list: checking user |%s| against |%s|\n",
480                           user, *list));
481
482                 /*
483                  * Check raw username.
484                  */
485                 if (strequal(user, *list))
486                         return(True);
487
488                 /*
489                  * Now check to see if any combination
490                  * of UNIX and netgroups has been specified.
491                  */
492
493                 if(**list == '@') {
494                         /*
495                          * Old behaviour. Check netgroup list
496                          * followed by UNIX list.
497                          */
498                         if(user_in_netgroup(sconn, user, *list +1))
499                                 return True;
500                         if(user_in_group(user, *list +1))
501                                 return True;
502                 } else if (**list == '+') {
503
504                         if((*(*list +1)) == '&') {
505                                 /*
506                                  * Search UNIX list followed by netgroup.
507                                  */
508                                 if(user_in_group(user, *list +2))
509                                         return True;
510                                 if(user_in_netgroup(sconn, user, *list +2))
511                                         return True;
512
513                         } else {
514
515                                 /*
516                                  * Just search UNIX list.
517                                  */
518
519                                 if(user_in_group(user, *list +1))
520                                         return True;
521                         }
522
523                 } else if (**list == '&') {
524
525                         if(*(*list +1) == '+') {
526                                 /*
527                                  * Search netgroup list followed by UNIX list.
528                                  */
529                                 if(user_in_netgroup(sconn, user, *list +2))
530                                         return True;
531                                 if(user_in_group(user, *list +2))
532                                         return True;
533                         } else {
534                                 /*
535                                  * Just search netgroup list.
536                                  */
537                                 if(user_in_netgroup(sconn, user, *list +1))
538                                         return True;
539                         }
540                 }
541
542                 list++;
543         }
544         return(False);
545 }
546
547 /****************************************************************************
548  Check if a username is valid.
549 ****************************************************************************/
550
551 static bool user_ok(struct smbd_server_connection *sconn,
552                     const char *user, int snum)
553 {
554         bool ret;
555
556         ret = True;
557
558         if (lp_invalid_users(snum)) {
559                 char **invalid = str_list_copy(talloc_tos(),
560                         lp_invalid_users(snum));
561                 if (invalid &&
562                     str_list_substitute(invalid, "%S", lp_servicename(snum))) {
563
564                         /* This is used in sec=share only, so no current user
565                          * around to pass to str_list_sub_basic() */
566
567                         if ( invalid && str_list_sub_basic(invalid, "", "") ) {
568                                 ret = !user_in_list(sconn, user,
569                                                     (const char **)invalid);
570                         }
571                 }
572                 TALLOC_FREE(invalid);
573         }
574
575         if (ret && lp_valid_users(snum)) {
576                 char **valid = str_list_copy(talloc_tos(),
577                         lp_valid_users(snum));
578                 if ( valid &&
579                      str_list_substitute(valid, "%S", lp_servicename(snum)) ) {
580
581                         /* This is used in sec=share only, so no current user
582                          * around to pass to str_list_sub_basic() */
583
584                         if ( valid && str_list_sub_basic(valid, "", "") ) {
585                                 ret = user_in_list(sconn, user,
586                                                    (const char **)valid);
587                         }
588                 }
589                 TALLOC_FREE(valid);
590         }
591
592         if (ret && lp_onlyuser(snum)) {
593                 char **user_list = str_list_make_v3(
594                         talloc_tos(), lp_username(snum), NULL);
595                 if (user_list &&
596                     str_list_substitute(user_list, "%S",
597                                         lp_servicename(snum))) {
598                         ret = user_in_list(sconn, user,
599                                            (const char **)user_list);
600                 }
601                 TALLOC_FREE(user_list);
602         }
603
604         return(ret);
605 }
606
607 /****************************************************************************
608  Validate a group username entry. Return the username or NULL.
609 ****************************************************************************/
610
611 static char *validate_group(struct smbd_server_connection *sconn,
612                             char *group, DATA_BLOB password,int snum)
613 {
614 #ifdef HAVE_NETGROUP
615         {
616                 char *host, *user, *domain;
617                 struct auth_context *actx = sconn->smb1.negprot.auth_context;
618                 bool enc = sconn->smb1.negprot.encrypted_passwords;
619                 setnetgrent(group);
620                 while (getnetgrent(&host, &user, &domain)) {
621                         if (user) {
622                                 if (user_ok(sconn, user, snum) &&
623                                     password_ok(actx, enc,
624                                                 get_session_workgroup(sconn),
625                                                 user,password)) {
626                                         endnetgrent();
627                                         return(user);
628                                 }
629                         }
630                 }
631                 endnetgrent();
632         }
633 #endif
634
635 #ifdef HAVE_GETGRENT
636         {
637                 struct group *gptr;
638                 struct auth_context *actx = sconn->smb1.negprot.auth_context;
639                 bool enc = sconn->smb1.negprot.encrypted_passwords;
640
641                 setgrent();
642                 while ((gptr = (struct group *)getgrent())) {
643                         if (strequal(gptr->gr_name,group))
644                                 break;
645                 }
646
647                 /*
648                  * As user_ok can recurse doing a getgrent(), we must
649                  * copy the member list onto the heap before
650                  * use. Bug pointed out by leon@eatworms.swmed.edu.
651                  */
652
653                 if (gptr) {
654                         char *member_list = NULL;
655                         size_t list_len = 0;
656                         char *member;
657                         int i;
658
659                         for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
660                                 list_len += strlen(gptr->gr_mem[i])+1;
661                         }
662                         list_len++;
663
664                         member_list = (char *)SMB_MALLOC(list_len);
665                         if (!member_list) {
666                                 endgrent();
667                                 return NULL;
668                         }
669
670                         *member_list = '\0';
671                         member = member_list;
672
673                         for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
674                                 size_t member_len = strlen(gptr->gr_mem[i])+1;
675
676                                 DEBUG(10,("validate_group: = gr_mem = "
677                                           "%s\n", gptr->gr_mem[i]));
678
679                                 safe_strcpy(member, gptr->gr_mem[i],
680                                         list_len - (member-member_list));
681                                 member += member_len;
682                         }
683
684                         endgrent();
685
686                         member = member_list;
687                         while (*member) {
688                                 if (user_ok(sconn, member,snum) &&
689                                     password_ok(actx, enc,
690                                                 get_session_workgroup(sconn),
691                                                 member,password)) {
692                                         char *name = talloc_strdup(talloc_tos(),
693                                                                 member);
694                                         SAFE_FREE(member_list);
695                                         return name;
696                                 }
697
698                                 DEBUG(10,("validate_group = member = %s\n",
699                                           member));
700
701                                 member += strlen(member) + 1;
702                         }
703
704                         SAFE_FREE(member_list);
705                 } else {
706                         endgrent();
707                         return NULL;
708                 }
709         }
710 #endif
711         return(NULL);
712 }
713
714 /****************************************************************************
715  Check for authority to login to a service with a given username/password.
716  Note this is *NOT* used when logging on using sessionsetup_and_X.
717 ****************************************************************************/
718
719 bool authorise_login(struct smbd_server_connection *sconn,
720                      int snum, fstring user, DATA_BLOB password,
721                      bool *guest)
722 {
723         bool ok = False;
724         struct auth_context *actx = sconn->smb1.negprot.auth_context;
725         bool enc = sconn->smb1.negprot.encrypted_passwords;
726
727 #ifdef DEBUG_PASSWORD
728         DEBUG(100,("authorise_login: checking authorisation on "
729                    "user=%s pass=%s\n", user,password.data));
730 #endif
731
732         *guest = False;
733
734         /* there are several possibilities:
735                 1) login as the given user with given password
736                 2) login as a previously registered username with the given
737                    password
738                 3) login as a session list username with the given password
739                 4) login as a previously validated user/password pair
740                 5) login as the "user =" user with given password
741                 6) login as the "user =" user with no password
742                    (guest connection)
743                 7) login as guest user with no password
744
745                 if the service is guest_only then steps 1 to 5 are skipped
746         */
747
748         /* now check the list of session users */
749         if (!ok) {
750                 char *auser;
751                 char *user_list = NULL;
752                 char *saveptr;
753
754                 if (sconn->smb1.sessions.session_userlist)
755                         user_list = SMB_STRDUP(sconn->smb1.sessions.session_userlist);
756                 else
757                         user_list = SMB_STRDUP("");
758
759                 if (!user_list)
760                         return(False);
761
762                 for (auser = strtok_r(user_list, LIST_SEP, &saveptr);
763                      !ok && auser;
764                      auser = strtok_r(NULL, LIST_SEP, &saveptr)) {
765                         fstring user2;
766                         fstrcpy(user2,auser);
767                         if (!user_ok(sconn,user2,snum))
768                                 continue;
769
770                         if (password_ok(actx, enc,
771                                         get_session_workgroup(sconn),
772                                         user2,password)) {
773                                 ok = True;
774                                 fstrcpy(user,user2);
775                                 DEBUG(3,("authorise_login: ACCEPTED: session "
776                                          "list username (%s) and given "
777                                          "password ok\n", user));
778                         }
779                 }
780
781                 SAFE_FREE(user_list);
782         }
783
784         /* check the user= fields and the given password */
785         if (!ok && lp_username(snum)) {
786                 TALLOC_CTX *ctx = talloc_tos();
787                 char *auser;
788                 char *user_list = talloc_strdup(ctx, lp_username(snum));
789                 char *saveptr;
790
791                 if (!user_list) {
792                         goto check_guest;
793                 }
794
795                 user_list = talloc_string_sub(ctx,
796                                 user_list,
797                                 "%S",
798                                 lp_servicename(snum));
799
800                 if (!user_list) {
801                         goto check_guest;
802                 }
803
804                 for (auser = strtok_r(user_list, LIST_SEP, &saveptr);
805                      auser && !ok;
806                      auser = strtok_r(NULL, LIST_SEP, &saveptr)) {
807                         if (*auser == '@') {
808                                 auser = validate_group(sconn,auser+1,
809                                                        password,snum);
810                                 if (auser) {
811                                         ok = True;
812                                         fstrcpy(user,auser);
813                                         DEBUG(3,("authorise_login: ACCEPTED: "
814                                                  "group username and given "
815                                                  "password ok (%s)\n", user));
816                                 }
817                         } else {
818                                 fstring user2;
819                                 fstrcpy(user2,auser);
820                                 if (user_ok(sconn,user2,snum) &&
821                                     password_ok(actx, enc,
822                                                 get_session_workgroup(sconn),
823                                                 user2,password)) {
824                                         ok = True;
825                                         fstrcpy(user,user2);
826                                         DEBUG(3,("authorise_login: ACCEPTED: "
827                                                  "user list username and "
828                                                  "given password ok (%s)\n",
829                                                  user));
830                                 }
831                         }
832                 }
833         }
834
835   check_guest:
836
837         /* check for a normal guest connection */
838         if (!ok && GUEST_OK(snum)) {
839                 struct passwd *guest_pw;
840                 fstring guestname;
841                 fstrcpy(guestname,lp_guestaccount());
842                 guest_pw = Get_Pwnam_alloc(talloc_tos(), guestname);
843                 if (guest_pw != NULL) {
844                         fstrcpy(user,guestname);
845                         ok = True;
846                         DEBUG(3,("authorise_login: ACCEPTED: guest account "
847                                  "and guest ok (%s)\n", user));
848                 } else {
849                         DEBUG(0,("authorise_login: Invalid guest account "
850                                  "%s??\n",guestname));
851                 }
852                 TALLOC_FREE(guest_pw);
853                 *guest = True;
854         }
855
856         if (ok && !user_ok(sconn, user, snum)) {
857                 DEBUG(0,("authorise_login: rejected invalid user %s\n",user));
858                 ok = False;
859         }
860
861         return(ok);
862 }