s3:smbd make yp cache local.
[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         static char *my_yp_domain = NULL;
416         fstring lowercase_user;
417
418         if (my_yp_domain == NULL) {
419                 yp_get_default_domain(&my_yp_domain);
420         }
421
422         if (my_yp_domain == NULL) {
423                 DEBUG(5,("Unable to get default yp domain, "
424                         "let's try without specifying it\n"));
425         }
426
427         DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
428                 user, my_yp_domain?my_yp_domain:"(ANY)", ngname));
429
430         if (innetgr(ngname, NULL, user, my_yp_domain)) {
431                 DEBUG(5,("user_in_netgroup: Found\n"));
432                 return true;
433         }
434
435         /*
436          * Ok, innetgr is case sensitive. Try once more with lowercase
437          * just in case. Attempt to fix #703. JRA.
438          */
439         fstrcpy(lowercase_user, user);
440         strlower_m(lowercase_user);
441
442         if (strcmp(user,lowercase_user) == 0) {
443                 /* user name was already lower case! */
444                 return false;
445         }
446
447         DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
448                 lowercase_user, my_yp_domain?my_yp_domain:"(ANY)", ngname));
449
450         if (innetgr(ngname, NULL, lowercase_user, my_yp_domain)) {
451                 DEBUG(5,("user_in_netgroup: Found\n"));
452                 return true;
453         }
454 #endif /* HAVE_NETGROUP */
455         return false;
456 }
457
458 /****************************************************************************
459  Check if a user is in a user list - can check combinations of UNIX
460  and netgroup lists.
461 ****************************************************************************/
462
463 bool user_in_list(struct smbd_server_connection *sconn,
464                   const char *user,const char **list)
465 {
466         if (!list || !*list)
467                 return False;
468
469         DEBUG(10,("user_in_list: checking user %s in list\n", user));
470
471         while (*list) {
472
473                 DEBUG(10,("user_in_list: checking user |%s| against |%s|\n",
474                           user, *list));
475
476                 /*
477                  * Check raw username.
478                  */
479                 if (strequal(user, *list))
480                         return(True);
481
482                 /*
483                  * Now check to see if any combination
484                  * of UNIX and netgroups has been specified.
485                  */
486
487                 if(**list == '@') {
488                         /*
489                          * Old behaviour. Check netgroup list
490                          * followed by UNIX list.
491                          */
492                         if(user_in_netgroup(sconn, user, *list +1))
493                                 return True;
494                         if(user_in_group(user, *list +1))
495                                 return True;
496                 } else if (**list == '+') {
497
498                         if((*(*list +1)) == '&') {
499                                 /*
500                                  * Search UNIX list followed by netgroup.
501                                  */
502                                 if(user_in_group(user, *list +2))
503                                         return True;
504                                 if(user_in_netgroup(sconn, user, *list +2))
505                                         return True;
506
507                         } else {
508
509                                 /*
510                                  * Just search UNIX list.
511                                  */
512
513                                 if(user_in_group(user, *list +1))
514                                         return True;
515                         }
516
517                 } else if (**list == '&') {
518
519                         if(*(*list +1) == '+') {
520                                 /*
521                                  * Search netgroup list followed by UNIX list.
522                                  */
523                                 if(user_in_netgroup(sconn, user, *list +2))
524                                         return True;
525                                 if(user_in_group(user, *list +2))
526                                         return True;
527                         } else {
528                                 /*
529                                  * Just search netgroup list.
530                                  */
531                                 if(user_in_netgroup(sconn, user, *list +1))
532                                         return True;
533                         }
534                 }
535
536                 list++;
537         }
538         return(False);
539 }
540
541 /****************************************************************************
542  Check if a username is valid.
543 ****************************************************************************/
544
545 static bool user_ok(struct smbd_server_connection *sconn,
546                     const char *user, int snum)
547 {
548         bool ret;
549
550         ret = True;
551
552         if (lp_invalid_users(snum)) {
553                 char **invalid = str_list_copy(talloc_tos(),
554                         lp_invalid_users(snum));
555                 if (invalid &&
556                     str_list_substitute(invalid, "%S", lp_servicename(snum))) {
557
558                         /* This is used in sec=share only, so no current user
559                          * around to pass to str_list_sub_basic() */
560
561                         if ( invalid && str_list_sub_basic(invalid, "", "") ) {
562                                 ret = !user_in_list(sconn, user,
563                                                     (const char **)invalid);
564                         }
565                 }
566                 TALLOC_FREE(invalid);
567         }
568
569         if (ret && lp_valid_users(snum)) {
570                 char **valid = str_list_copy(talloc_tos(),
571                         lp_valid_users(snum));
572                 if ( valid &&
573                      str_list_substitute(valid, "%S", lp_servicename(snum)) ) {
574
575                         /* This is used in sec=share only, so no current user
576                          * around to pass to str_list_sub_basic() */
577
578                         if ( valid && str_list_sub_basic(valid, "", "") ) {
579                                 ret = user_in_list(sconn, user,
580                                                    (const char **)valid);
581                         }
582                 }
583                 TALLOC_FREE(valid);
584         }
585
586         if (ret && lp_onlyuser(snum)) {
587                 char **user_list = str_list_make_v3(
588                         talloc_tos(), lp_username(snum), NULL);
589                 if (user_list &&
590                     str_list_substitute(user_list, "%S",
591                                         lp_servicename(snum))) {
592                         ret = user_in_list(sconn, user,
593                                            (const char **)user_list);
594                 }
595                 TALLOC_FREE(user_list);
596         }
597
598         return(ret);
599 }
600
601 /****************************************************************************
602  Validate a group username entry. Return the username or NULL.
603 ****************************************************************************/
604
605 static char *validate_group(struct smbd_server_connection *sconn,
606                             char *group, DATA_BLOB password,int snum)
607 {
608 #ifdef HAVE_NETGROUP
609         {
610                 char *host, *user, *domain;
611                 struct auth_context *actx = sconn->smb1.negprot.auth_context;
612                 bool enc = sconn->smb1.negprot.encrypted_passwords;
613                 setnetgrent(group);
614                 while (getnetgrent(&host, &user, &domain)) {
615                         if (user) {
616                                 if (user_ok(sconn, user, snum) &&
617                                     password_ok(actx, enc,
618                                                 get_session_workgroup(sconn),
619                                                 user,password)) {
620                                         endnetgrent();
621                                         return(user);
622                                 }
623                         }
624                 }
625                 endnetgrent();
626         }
627 #endif
628
629 #ifdef HAVE_GETGRENT
630         {
631                 struct group *gptr;
632                 struct auth_context *actx = sconn->smb1.negprot.auth_context;
633                 bool enc = sconn->smb1.negprot.encrypted_passwords;
634
635                 setgrent();
636                 while ((gptr = (struct group *)getgrent())) {
637                         if (strequal(gptr->gr_name,group))
638                                 break;
639                 }
640
641                 /*
642                  * As user_ok can recurse doing a getgrent(), we must
643                  * copy the member list onto the heap before
644                  * use. Bug pointed out by leon@eatworms.swmed.edu.
645                  */
646
647                 if (gptr) {
648                         char *member_list = NULL;
649                         size_t list_len = 0;
650                         char *member;
651                         int i;
652
653                         for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
654                                 list_len += strlen(gptr->gr_mem[i])+1;
655                         }
656                         list_len++;
657
658                         member_list = (char *)SMB_MALLOC(list_len);
659                         if (!member_list) {
660                                 endgrent();
661                                 return NULL;
662                         }
663
664                         *member_list = '\0';
665                         member = member_list;
666
667                         for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
668                                 size_t member_len = strlen(gptr->gr_mem[i])+1;
669
670                                 DEBUG(10,("validate_group: = gr_mem = "
671                                           "%s\n", gptr->gr_mem[i]));
672
673                                 safe_strcpy(member, gptr->gr_mem[i],
674                                         list_len - (member-member_list));
675                                 member += member_len;
676                         }
677
678                         endgrent();
679
680                         member = member_list;
681                         while (*member) {
682                                 if (user_ok(sconn, member,snum) &&
683                                     password_ok(actx, enc,
684                                                 get_session_workgroup(sconn),
685                                                 member,password)) {
686                                         char *name = talloc_strdup(talloc_tos(),
687                                                                 member);
688                                         SAFE_FREE(member_list);
689                                         return name;
690                                 }
691
692                                 DEBUG(10,("validate_group = member = %s\n",
693                                           member));
694
695                                 member += strlen(member) + 1;
696                         }
697
698                         SAFE_FREE(member_list);
699                 } else {
700                         endgrent();
701                         return NULL;
702                 }
703         }
704 #endif
705         return(NULL);
706 }
707
708 /****************************************************************************
709  Check for authority to login to a service with a given username/password.
710  Note this is *NOT* used when logging on using sessionsetup_and_X.
711 ****************************************************************************/
712
713 bool authorise_login(struct smbd_server_connection *sconn,
714                      int snum, fstring user, DATA_BLOB password,
715                      bool *guest)
716 {
717         bool ok = False;
718         struct auth_context *actx = sconn->smb1.negprot.auth_context;
719         bool enc = sconn->smb1.negprot.encrypted_passwords;
720
721 #ifdef DEBUG_PASSWORD
722         DEBUG(100,("authorise_login: checking authorisation on "
723                    "user=%s pass=%s\n", user,password.data));
724 #endif
725
726         *guest = False;
727
728         /* there are several possibilities:
729                 1) login as the given user with given password
730                 2) login as a previously registered username with the given
731                    password
732                 3) login as a session list username with the given password
733                 4) login as a previously validated user/password pair
734                 5) login as the "user =" user with given password
735                 6) login as the "user =" user with no password
736                    (guest connection)
737                 7) login as guest user with no password
738
739                 if the service is guest_only then steps 1 to 5 are skipped
740         */
741
742         /* now check the list of session users */
743         if (!ok) {
744                 char *auser;
745                 char *user_list = NULL;
746                 char *saveptr;
747
748                 if (sconn->smb1.sessions.session_userlist)
749                         user_list = SMB_STRDUP(sconn->smb1.sessions.session_userlist);
750                 else
751                         user_list = SMB_STRDUP("");
752
753                 if (!user_list)
754                         return(False);
755
756                 for (auser = strtok_r(user_list, LIST_SEP, &saveptr);
757                      !ok && auser;
758                      auser = strtok_r(NULL, LIST_SEP, &saveptr)) {
759                         fstring user2;
760                         fstrcpy(user2,auser);
761                         if (!user_ok(sconn,user2,snum))
762                                 continue;
763
764                         if (password_ok(actx, enc,
765                                         get_session_workgroup(sconn),
766                                         user2,password)) {
767                                 ok = True;
768                                 fstrcpy(user,user2);
769                                 DEBUG(3,("authorise_login: ACCEPTED: session "
770                                          "list username (%s) and given "
771                                          "password ok\n", user));
772                         }
773                 }
774
775                 SAFE_FREE(user_list);
776         }
777
778         /* check the user= fields and the given password */
779         if (!ok && lp_username(snum)) {
780                 TALLOC_CTX *ctx = talloc_tos();
781                 char *auser;
782                 char *user_list = talloc_strdup(ctx, lp_username(snum));
783                 char *saveptr;
784
785                 if (!user_list) {
786                         goto check_guest;
787                 }
788
789                 user_list = talloc_string_sub(ctx,
790                                 user_list,
791                                 "%S",
792                                 lp_servicename(snum));
793
794                 if (!user_list) {
795                         goto check_guest;
796                 }
797
798                 for (auser = strtok_r(user_list, LIST_SEP, &saveptr);
799                      auser && !ok;
800                      auser = strtok_r(NULL, LIST_SEP, &saveptr)) {
801                         if (*auser == '@') {
802                                 auser = validate_group(sconn,auser+1,
803                                                        password,snum);
804                                 if (auser) {
805                                         ok = True;
806                                         fstrcpy(user,auser);
807                                         DEBUG(3,("authorise_login: ACCEPTED: "
808                                                  "group username and given "
809                                                  "password ok (%s)\n", user));
810                                 }
811                         } else {
812                                 fstring user2;
813                                 fstrcpy(user2,auser);
814                                 if (user_ok(sconn,user2,snum) &&
815                                     password_ok(actx, enc,
816                                                 get_session_workgroup(sconn),
817                                                 user2,password)) {
818                                         ok = True;
819                                         fstrcpy(user,user2);
820                                         DEBUG(3,("authorise_login: ACCEPTED: "
821                                                  "user list username and "
822                                                  "given password ok (%s)\n",
823                                                  user));
824                                 }
825                         }
826                 }
827         }
828
829   check_guest:
830
831         /* check for a normal guest connection */
832         if (!ok && GUEST_OK(snum)) {
833                 struct passwd *guest_pw;
834                 fstring guestname;
835                 fstrcpy(guestname,lp_guestaccount());
836                 guest_pw = Get_Pwnam_alloc(talloc_tos(), guestname);
837                 if (guest_pw != NULL) {
838                         fstrcpy(user,guestname);
839                         ok = True;
840                         DEBUG(3,("authorise_login: ACCEPTED: guest account "
841                                  "and guest ok (%s)\n", user));
842                 } else {
843                         DEBUG(0,("authorise_login: Invalid guest account "
844                                  "%s??\n",guestname));
845                 }
846                 TALLOC_FREE(guest_pw);
847                 *guest = True;
848         }
849
850         if (ok && !user_ok(sconn, user, snum)) {
851                 DEBUG(0,("authorise_login: rejected invalid user %s\n",user));
852                 ok = False;
853         }
854
855         return(ok);
856 }