ebc72350b5a74f21b10bd1865fb1ffdf7c845960
[kai/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
23 /* users from session setup */
24 static char *session_userlist = NULL;
25 /* workgroup from session setup. */
26 static char *session_workgroup = NULL;
27
28 /* this holds info on user ids that are already validated for this VC */
29 static user_struct *validated_users;
30 static int next_vuid = VUID_OFFSET;
31 static int num_validated_vuids;
32
33 enum server_allocated_state { SERVER_ALLOCATED_REQUIRED_YES,
34                                 SERVER_ALLOCATED_REQUIRED_NO,
35                                 SERVER_ALLOCATED_REQUIRED_ANY};
36
37 static user_struct *get_valid_user_struct_internal(uint16 vuid,
38                         enum server_allocated_state server_allocated)
39 {
40         user_struct *usp;
41         int count=0;
42
43         if (vuid == UID_FIELD_INVALID)
44                 return NULL;
45
46         for (usp=validated_users;usp;usp=usp->next,count++) {
47                 if (vuid == usp->vuid) {
48                         switch (server_allocated) {
49                                 case SERVER_ALLOCATED_REQUIRED_YES:
50                                         if (usp->server_info == NULL) {
51                                                 continue;
52                                         }
53                                         break;
54                                 case SERVER_ALLOCATED_REQUIRED_NO:
55                                         if (usp->server_info != NULL) {
56                                                 continue;
57                                         }
58                                 case SERVER_ALLOCATED_REQUIRED_ANY:
59                                         break;
60                         }
61                         if (count > 10) {
62                                 DLIST_PROMOTE(validated_users, usp);
63                         }
64                         return usp;
65                 }
66         }
67
68         return NULL;
69 }
70
71 /****************************************************************************
72  Check if a uid has been validated, and return an pointer to the user_struct
73  if it has. NULL if not. vuid is biased by an offset. This allows us to
74  tell random client vuid's (normally zero) from valid vuids.
75 ****************************************************************************/
76
77 user_struct *get_valid_user_struct(uint16 vuid)
78 {
79         return get_valid_user_struct_internal(vuid,
80                         SERVER_ALLOCATED_REQUIRED_YES);
81 }
82
83 bool is_partial_auth_vuid(uint16 vuid)
84 {
85         if (vuid == UID_FIELD_INVALID) {
86                 return False;
87         }
88         return get_valid_user_struct_internal(vuid,
89                         SERVER_ALLOCATED_REQUIRED_NO) ? True : False;
90 }
91
92 /****************************************************************************
93  Get the user struct of a partial NTLMSSP login
94 ****************************************************************************/
95
96 user_struct *get_partial_auth_user_struct(uint16 vuid)
97 {
98         return get_valid_user_struct_internal(vuid,
99                         SERVER_ALLOCATED_REQUIRED_NO);
100 }
101
102 /****************************************************************************
103  Invalidate a uid.
104 ****************************************************************************/
105
106 void invalidate_vuid(uint16 vuid)
107 {
108         user_struct *vuser = NULL;
109
110         if (vuid == UID_FIELD_INVALID) {
111                 return;
112         }
113
114         vuser = get_valid_user_struct_internal(vuid,
115                         SERVER_ALLOCATED_REQUIRED_ANY);
116         if (vuser == NULL) {
117                 return;
118         }
119
120         session_yield(vuser);
121
122         if (vuser->auth_ntlmssp_state) {
123                 auth_ntlmssp_end(&vuser->auth_ntlmssp_state);
124         }
125
126         DLIST_REMOVE(validated_users, vuser);
127
128         /* clear the vuid from the 'cache' on each connection, and
129            from the vuid 'owner' of connections */
130         conn_clear_vuid_caches(vuid);
131
132         TALLOC_FREE(vuser);
133         num_validated_vuids--;
134 }
135
136 /****************************************************************************
137  Invalidate all vuid entries for this process.
138 ****************************************************************************/
139
140 void invalidate_all_vuids(void)
141 {
142         user_struct *usp, *next=NULL;
143
144         for (usp=validated_users;usp;usp=next) {
145                 next = usp->next;
146                 invalidate_vuid(usp->vuid);
147         }
148 }
149
150 /****************************************************
151  Create a new partial auth user struct.
152 *****************************************************/
153
154 int register_initial_vuid(void)
155 {
156         user_struct *vuser;
157
158         /* Paranoia check. */
159         if(lp_security() == SEC_SHARE) {
160                 smb_panic("register_initial_vuid: "
161                         "Tried to register uid in security=share");
162         }
163
164         /* Limit allowed vuids to 16bits - VUID_OFFSET. */
165         if (num_validated_vuids >= 0xFFFF-VUID_OFFSET) {
166                 return UID_FIELD_INVALID;
167         }
168
169         if((vuser = talloc_zero(NULL, user_struct)) == NULL) {
170                 DEBUG(0,("register_initial_vuid: "
171                                 "Failed to talloc users struct!\n"));
172                 return UID_FIELD_INVALID;
173         }
174
175         /* Allocate a free vuid. Yes this is a linear search... */
176         while( get_valid_user_struct_internal(next_vuid,
177                         SERVER_ALLOCATED_REQUIRED_ANY) != NULL ) {
178                 next_vuid++;
179                 /* Check for vuid wrap. */
180                 if (next_vuid == UID_FIELD_INVALID) {
181                         next_vuid = VUID_OFFSET;
182                 }
183         }
184
185         DEBUG(10,("register_initial_vuid: allocated vuid = %u\n",
186                 (unsigned int)next_vuid ));
187
188         vuser->vuid = next_vuid;
189
190         /*
191          * This happens in an unfinished NTLMSSP session setup. We
192          * need to allocate a vuid between the first and second calls
193          * to NTLMSSP.
194          */
195         next_vuid++;
196         num_validated_vuids++;
197
198         DLIST_ADD(validated_users, vuser);
199         return vuser->vuid;
200 }
201
202 static int register_homes_share(const char *username)
203 {
204         int result;
205         struct passwd *pwd;
206
207         result = lp_servicenumber(username);
208         if (result != -1) {
209                 DEBUG(3, ("Using static (or previously created) service for "
210                           "user '%s'; path = '%s'\n", username,
211                           lp_pathname(result)));
212                 return result;
213         }
214
215         pwd = getpwnam_alloc(talloc_tos(), username);
216
217         if ((pwd == NULL) || (pwd->pw_dir[0] == '\0')) {
218                 DEBUG(3, ("No home directory defined for user '%s'\n",
219                           username));
220                 TALLOC_FREE(pwd);
221                 return -1;
222         }
223
224         DEBUG(3, ("Adding homes service for user '%s' using home directory: "
225                   "'%s'\n", username, pwd->pw_dir));
226
227         result = add_home_service(username, username, pwd->pw_dir);
228
229         TALLOC_FREE(pwd);
230         return result;
231 }
232
233 /**
234  *  register that a valid login has been performed, establish 'session'.
235  *  @param server_info The token returned from the authentication process.
236  *   (now 'owned' by register_existing_vuid)
237  *
238  *  @param session_key The User session key for the login session (now also
239  *  'owned' by register_existing_vuid)
240  *
241  *  @param respose_blob The NT challenge-response, if available.  (May be
242  *  freed after this call)
243  *
244  *  @param smb_name The untranslated name of the user
245  *
246  *  @return Newly allocated vuid, biased by an offset. (This allows us to
247  *   tell random client vuid's (normally zero) from valid vuids.)
248  *
249  */
250
251 int register_existing_vuid(uint16 vuid,
252                         auth_serversupplied_info *server_info,
253                         DATA_BLOB response_blob,
254                         const char *smb_name)
255 {
256         fstring tmp;
257         user_struct *vuser;
258
259         vuser = get_partial_auth_user_struct(vuid);
260         if (!vuser) {
261                 goto fail;
262         }
263
264         /* Use this to keep tabs on all our info from the authentication */
265         vuser->server_info = talloc_move(vuser, &server_info);
266
267         /* This is a potentially untrusted username */
268         alpha_strcpy(tmp, smb_name, ". _-$", sizeof(tmp));
269
270         vuser->server_info->sanitized_username = talloc_strdup(
271                 vuser->server_info, tmp);
272
273         DEBUG(10,("register_existing_vuid: (%u,%u) %s %s %s guest=%d\n",
274                   (unsigned int)vuser->server_info->uid,
275                   (unsigned int)vuser->server_info->gid,
276                   vuser->server_info->unix_name,
277                   vuser->server_info->sanitized_username,
278                   pdb_get_domain(vuser->server_info->sam_account),
279                   vuser->server_info->guest ));
280
281         DEBUG(3, ("register_existing_vuid: User name: %s\t"
282                   "Real name: %s\n", vuser->server_info->unix_name,
283                   pdb_get_fullname(vuser->server_info->sam_account)));
284
285         if (!vuser->server_info->ptok) {
286                 DEBUG(1, ("register_existing_vuid: server_info does not "
287                         "contain a user_token - cannot continue\n"));
288                 goto fail;
289         }
290
291         DEBUG(3,("register_existing_vuid: UNIX uid %d is UNIX user %s, "
292                 "and will be vuid %u\n", (int)vuser->server_info->uid,
293                  vuser->server_info->unix_name, vuser->vuid));
294
295         next_vuid++;
296         num_validated_vuids++;
297
298         if (!session_claim(vuser)) {
299                 DEBUG(1, ("register_existing_vuid: Failed to claim session "
300                         "for vuid=%d\n",
301                         vuser->vuid));
302                 goto fail;
303         }
304
305         /* Register a home dir service for this user if
306         (a) This is not a guest connection,
307         (b) we have a home directory defined
308         (c) there s not an existing static share by that name
309         If a share exists by this name (autoloaded or not) reuse it . */
310
311         vuser->homes_snum = -1;
312
313         if (!vuser->server_info->guest) {
314                 vuser->homes_snum = register_homes_share(
315                         vuser->server_info->unix_name);
316         }
317
318         if (srv_is_signing_negotiated() && !vuser->server_info->guest &&
319                         !srv_signing_started()) {
320                 /* Try and turn on server signing on the first non-guest
321                  * sessionsetup. */
322                 srv_set_signing(vuser->server_info->user_session_key, response_blob);
323         }
324
325         /* fill in the current_user_info struct */
326         set_current_user_info(
327                 vuser->server_info->sanitized_username,
328                 vuser->server_info->unix_name,
329                 pdb_get_fullname(vuser->server_info->sam_account),
330                 pdb_get_domain(vuser->server_info->sam_account));
331
332         return vuser->vuid;
333
334   fail:
335
336         if (vuser) {
337                 invalidate_vuid(vuid);
338         }
339         return UID_FIELD_INVALID;
340 }
341
342 /****************************************************************************
343  Add a name to the session users list.
344 ****************************************************************************/
345
346 void add_session_user(const char *user)
347 {
348         struct passwd *pw;
349         char *tmp;
350
351         pw = Get_Pwnam_alloc(talloc_tos(), user);
352
353         if (pw == NULL) {
354                 return;
355         }
356
357         if (session_userlist == NULL) {
358                 session_userlist = SMB_STRDUP(pw->pw_name);
359                 goto done;
360         }
361
362         if (in_list(pw->pw_name,session_userlist,False) ) {
363                 goto done;
364         }
365
366         if (strlen(session_userlist) > 128 * 1024) {
367                 DEBUG(3,("add_session_user: session userlist already "
368                          "too large.\n"));
369                 goto done;
370         }
371
372         if (asprintf(&tmp, "%s %s", session_userlist, pw->pw_name) == -1) {
373                 DEBUG(3, ("asprintf failed\n"));
374                 goto done;
375         }
376
377         SAFE_FREE(session_userlist);
378         session_userlist = tmp;
379  done:
380         TALLOC_FREE(pw);
381 }
382
383 /****************************************************************************
384  In security=share mode we need to store the client workgroup, as that's
385   what Vista uses for the NTLMv2 calculation.
386 ****************************************************************************/
387
388 void add_session_workgroup(const char *workgroup)
389 {
390         if (session_workgroup) {
391                 SAFE_FREE(session_workgroup);
392         }
393         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(void)
402 {
403         return 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(const char *user, const char *ngname)
412 {
413 #ifdef HAVE_NETGROUP
414         static char *mydomain = NULL;
415         fstring lowercase_user;
416
417         if (mydomain == NULL)
418                 yp_get_default_domain(&mydomain);
419
420         if(mydomain == NULL) {
421                 DEBUG(5,("Unable to get default yp domain, "
422                         "let's try without specifying it\n"));
423         }
424
425         DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
426                 user, mydomain?mydomain:"(ANY)", ngname));
427
428         if (innetgr(ngname, NULL, user, mydomain)) {
429                 DEBUG(5,("user_in_netgroup: Found\n"));
430                 return (True);
431         } else {
432
433                 /*
434                  * Ok, innetgr is case sensitive. Try once more with lowercase
435                  * just in case. Attempt to fix #703. JRA.
436                  */
437
438                 fstrcpy(lowercase_user, user);
439                 strlower_m(lowercase_user);
440
441                 DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
442                         lowercase_user, mydomain?mydomain:"(ANY)", ngname));
443
444                 if (innetgr(ngname, NULL, lowercase_user, mydomain)) {
445                         DEBUG(5,("user_in_netgroup: Found\n"));
446                         return (True);
447                 }
448         }
449 #endif /* HAVE_NETGROUP */
450         return False;
451 }
452
453 /****************************************************************************
454  Check if a user is in a user list - can check combinations of UNIX
455  and netgroup lists.
456 ****************************************************************************/
457
458 bool user_in_list(const char *user,const char **list)
459 {
460         if (!list || !*list)
461                 return False;
462
463         DEBUG(10,("user_in_list: checking user %s in list\n", user));
464
465         while (*list) {
466
467                 DEBUG(10,("user_in_list: checking user |%s| against |%s|\n",
468                           user, *list));
469
470                 /*
471                  * Check raw username.
472                  */
473                 if (strequal(user, *list))
474                         return(True);
475
476                 /*
477                  * Now check to see if any combination
478                  * of UNIX and netgroups has been specified.
479                  */
480
481                 if(**list == '@') {
482                         /*
483                          * Old behaviour. Check netgroup list
484                          * followed by UNIX list.
485                          */
486                         if(user_in_netgroup(user, *list +1))
487                                 return True;
488                         if(user_in_group(user, *list +1))
489                                 return True;
490                 } else if (**list == '+') {
491
492                         if((*(*list +1)) == '&') {
493                                 /*
494                                  * Search UNIX list followed by netgroup.
495                                  */
496                                 if(user_in_group(user, *list +2))
497                                         return True;
498                                 if(user_in_netgroup(user, *list +2))
499                                         return True;
500
501                         } else {
502
503                                 /*
504                                  * Just search UNIX list.
505                                  */
506
507                                 if(user_in_group(user, *list +1))
508                                         return True;
509                         }
510
511                 } else if (**list == '&') {
512
513                         if(*(*list +1) == '+') {
514                                 /*
515                                  * Search netgroup list followed by UNIX list.
516                                  */
517                                 if(user_in_netgroup(user, *list +2))
518                                         return True;
519                                 if(user_in_group(user, *list +2))
520                                         return True;
521                         } else {
522                                 /*
523                                  * Just search netgroup list.
524                                  */
525                                 if(user_in_netgroup(user, *list +1))
526                                         return True;
527                         }
528                 }
529
530                 list++;
531         }
532         return(False);
533 }
534
535 /****************************************************************************
536  Check if a username is valid.
537 ****************************************************************************/
538
539 static bool user_ok(const char *user, int snum)
540 {
541         char **valid, **invalid;
542         bool ret;
543
544         valid = invalid = NULL;
545         ret = True;
546
547         if (lp_invalid_users(snum)) {
548                 str_list_copy(talloc_tos(), &invalid, lp_invalid_users(snum));
549                 if (invalid &&
550                     str_list_substitute(invalid, "%S", lp_servicename(snum))) {
551
552                         /* This is used in sec=share only, so no current user
553                          * around to pass to str_list_sub_basic() */
554
555                         if ( invalid && str_list_sub_basic(invalid, "", "") ) {
556                                 ret = !user_in_list(user,
557                                                     (const char **)invalid);
558                         }
559                 }
560         }
561         TALLOC_FREE(invalid);
562
563         if (ret && lp_valid_users(snum)) {
564                 str_list_copy(talloc_tos(), &valid, lp_valid_users(snum));
565                 if ( valid &&
566                      str_list_substitute(valid, "%S", lp_servicename(snum)) ) {
567
568                         /* This is used in sec=share only, so no current user
569                          * around to pass to str_list_sub_basic() */
570
571                         if ( valid && str_list_sub_basic(valid, "", "") ) {
572                                 ret = user_in_list(user, (const char **)valid);
573                         }
574                 }
575         }
576         TALLOC_FREE(valid);
577
578         if (ret && lp_onlyuser(snum)) {
579                 char **user_list = str_list_make(
580                         talloc_tos(), lp_username(snum), NULL);
581                 if (user_list &&
582                     str_list_substitute(user_list, "%S",
583                                         lp_servicename(snum))) {
584                         ret = user_in_list(user, (const char **)user_list);
585                 }
586                 TALLOC_FREE(user_list);
587         }
588
589         return(ret);
590 }
591
592 /****************************************************************************
593  Validate a group username entry. Return the username or NULL.
594 ****************************************************************************/
595
596 static char *validate_group(char *group, DATA_BLOB password,int snum)
597 {
598 #ifdef HAVE_NETGROUP
599         {
600                 char *host, *user, *domain;
601                 setnetgrent(group);
602                 while (getnetgrent(&host, &user, &domain)) {
603                         if (user) {
604                                 if (user_ok(user, snum) && 
605                                     password_ok(user,password)) {
606                                         endnetgrent();
607                                         return(user);
608                                 }
609                         }
610                 }
611                 endnetgrent();
612         }
613 #endif
614
615 #ifdef HAVE_GETGRENT
616         {
617                 struct group *gptr;
618                 setgrent();
619                 while ((gptr = (struct group *)getgrent())) {
620                         if (strequal(gptr->gr_name,group))
621                                 break;
622                 }
623
624                 /*
625                  * As user_ok can recurse doing a getgrent(), we must
626                  * copy the member list onto the heap before
627                  * use. Bug pointed out by leon@eatworms.swmed.edu.
628                  */
629
630                 if (gptr) {
631                         char *member_list = NULL;
632                         size_t list_len = 0;
633                         char *member;
634                         int i;
635
636                         for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
637                                 list_len += strlen(gptr->gr_mem[i])+1;
638                         }
639                         list_len++;
640
641                         member_list = (char *)SMB_MALLOC(list_len);
642                         if (!member_list) {
643                                 endgrent();
644                                 return NULL;
645                         }
646
647                         *member_list = '\0';
648                         member = member_list;
649
650                         for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
651                                 size_t member_len = strlen(gptr->gr_mem[i])+1;
652
653                                 DEBUG(10,("validate_group: = gr_mem = "
654                                           "%s\n", gptr->gr_mem[i]));
655
656                                 safe_strcpy(member, gptr->gr_mem[i],
657                                         list_len - (member-member_list));
658                                 member += member_len;
659                         }
660
661                         endgrent();
662
663                         member = member_list;
664                         while (*member) {
665                                 if (user_ok(member,snum) &&
666                                     password_ok(member,password)) {
667                                         char *name = talloc_strdup(talloc_tos(),
668                                                                 member);
669                                         SAFE_FREE(member_list);
670                                         return name;
671                                 }
672
673                                 DEBUG(10,("validate_group = member = %s\n",
674                                           member));
675
676                                 member += strlen(member) + 1;
677                         }
678
679                         SAFE_FREE(member_list);
680                 } else {
681                         endgrent();
682                         return NULL;
683                 }
684         }
685 #endif
686         return(NULL);
687 }
688
689 /****************************************************************************
690  Check for authority to login to a service with a given username/password.
691  Note this is *NOT* used when logging on using sessionsetup_and_X.
692 ****************************************************************************/
693
694 bool authorise_login(int snum, fstring user, DATA_BLOB password,
695                      bool *guest)
696 {
697         bool ok = False;
698
699 #ifdef DEBUG_PASSWORD
700         DEBUG(100,("authorise_login: checking authorisation on "
701                    "user=%s pass=%s\n", user,password.data));
702 #endif
703
704         *guest = False;
705
706         /* there are several possibilities:
707                 1) login as the given user with given password
708                 2) login as a previously registered username with the given
709                    password
710                 3) login as a session list username with the given password
711                 4) login as a previously validated user/password pair
712                 5) login as the "user =" user with given password
713                 6) login as the "user =" user with no password
714                    (guest connection)
715                 7) login as guest user with no password
716
717                 if the service is guest_only then steps 1 to 5 are skipped
718         */
719
720         /* now check the list of session users */
721         if (!ok) {
722                 char *auser;
723                 char *user_list = NULL;
724                 char *saveptr;
725
726                 if ( session_userlist )
727                         user_list = SMB_STRDUP(session_userlist);
728                 else
729                         user_list = SMB_STRDUP("");
730
731                 if (!user_list)
732                         return(False);
733
734                 for (auser = strtok_r(user_list, LIST_SEP, &saveptr);
735                      !ok && auser;
736                      auser = strtok_r(NULL, LIST_SEP, &saveptr)) {
737                         fstring user2;
738                         fstrcpy(user2,auser);
739                         if (!user_ok(user2,snum))
740                                 continue;
741
742                         if (password_ok(user2,password)) {
743                                 ok = True;
744                                 fstrcpy(user,user2);
745                                 DEBUG(3,("authorise_login: ACCEPTED: session "
746                                          "list username (%s) and given "
747                                          "password ok\n", user));
748                         }
749                 }
750
751                 SAFE_FREE(user_list);
752         }
753
754         /* check the user= fields and the given password */
755         if (!ok && lp_username(snum)) {
756                 TALLOC_CTX *ctx = talloc_tos();
757                 char *auser;
758                 char *user_list = talloc_strdup(ctx, lp_username(snum));
759                 char *saveptr;
760
761                 if (!user_list) {
762                         goto check_guest;
763                 }
764
765                 user_list = talloc_string_sub(ctx,
766                                 user_list,
767                                 "%S",
768                                 lp_servicename(snum));
769
770                 if (!user_list) {
771                         goto check_guest;
772                 }
773
774                 for (auser = strtok_r(user_list, LIST_SEP, &saveptr);
775                      auser && !ok;
776                      auser = strtok_r(NULL, LIST_SEP, &saveptr)) {
777                         if (*auser == '@') {
778                                 auser = validate_group(auser+1,password,snum);
779                                 if (auser) {
780                                         ok = True;
781                                         fstrcpy(user,auser);
782                                         DEBUG(3,("authorise_login: ACCEPTED: "
783                                                  "group username and given "
784                                                  "password ok (%s)\n", user));
785                                 }
786                         } else {
787                                 fstring user2;
788                                 fstrcpy(user2,auser);
789                                 if (user_ok(user2,snum) &&
790                                     password_ok(user2,password)) {
791                                         ok = True;
792                                         fstrcpy(user,user2);
793                                         DEBUG(3,("authorise_login: ACCEPTED: "
794                                                  "user list username and "
795                                                  "given password ok (%s)\n",
796                                                  user));
797                                 }
798                         }
799                 }
800         }
801
802   check_guest:
803
804         /* check for a normal guest connection */
805         if (!ok && GUEST_OK(snum)) {
806                 struct passwd *guest_pw;
807                 fstring guestname;
808                 fstrcpy(guestname,lp_guestaccount());
809                 guest_pw = Get_Pwnam_alloc(talloc_tos(), guestname);
810                 if (guest_pw != NULL) {
811                         fstrcpy(user,guestname);
812                         ok = True;
813                         DEBUG(3,("authorise_login: ACCEPTED: guest account "
814                                  "and guest ok (%s)\n", user));
815                 } else {
816                         DEBUG(0,("authorise_login: Invalid guest account "
817                                  "%s??\n",guestname));
818                 }
819                 TALLOC_FREE(guest_pw);
820                 *guest = True;
821         }
822
823         if (ok && !user_ok(user, snum)) {
824                 DEBUG(0,("authorise_login: rejected invalid user %s\n",user));
825                 ok = False;
826         }
827
828         return(ok);
829 }