2 Unix SMB/CIFS implementation.
3 Password and authentication handling
4 Copyright (C) Andrew Tridgell 1992-1998
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 /* users from session setup */
24 static char *session_userlist
= NULL
;
25 static int len_session_userlist
= 0;
27 /* this holds info on user ids that are already validated for this VC */
28 static user_struct
*validated_users
;
29 static int next_vuid
= VUID_OFFSET
;
30 static int num_validated_vuids
;
32 extern userdom_struct current_user_info
;
35 /****************************************************************************
36 Check if a uid has been validated, and return an pointer to the user_struct
37 if it has. NULL if not. vuid is biased by an offset. This allows us to
38 tell random client vuid's (normally zero) from valid vuids.
39 ****************************************************************************/
41 user_struct
*get_valid_user_struct(uint16 vuid
)
46 if (vuid
== UID_FIELD_INVALID
)
49 for (usp
=validated_users
;usp
;usp
=usp
->next
,count
++) {
50 if (vuid
== usp
->vuid
&& usp
->server_info
) {
52 DLIST_PROMOTE(validated_users
, usp
);
61 /****************************************************************************
62 Get the user struct of a partial NTLMSSP login
63 ****************************************************************************/
65 user_struct
*get_partial_auth_user_struct(uint16 vuid
)
70 if (vuid
== UID_FIELD_INVALID
)
73 for (usp
=validated_users
;usp
;usp
=usp
->next
,count
++) {
74 if (vuid
== usp
->vuid
&& !usp
->server_info
) {
76 DLIST_PROMOTE(validated_users
, usp
);
85 /****************************************************************************
87 ****************************************************************************/
89 void invalidate_vuid(uint16 vuid
)
91 user_struct
*vuser
= get_valid_user_struct(vuid
);
96 SAFE_FREE(vuser
->homedir
);
97 SAFE_FREE(vuser
->unix_homedir
);
98 SAFE_FREE(vuser
->logon_script
);
100 session_yield(vuser
);
101 SAFE_FREE(vuser
->session_keystr
);
103 TALLOC_FREE(vuser
->server_info
);
105 data_blob_free(&vuser
->session_key
);
107 DLIST_REMOVE(validated_users
, vuser
);
109 /* clear the vuid from the 'cache' on each connection, and
110 from the vuid 'owner' of connections */
111 conn_clear_vuid_cache(vuid
);
113 SAFE_FREE(vuser
->groups
);
114 TALLOC_FREE(vuser
->nt_user_token
);
116 num_validated_vuids
--;
119 /****************************************************************************
120 Invalidate all vuid entries for this process.
121 ****************************************************************************/
123 void invalidate_all_vuids(void)
125 user_struct
*usp
, *next
=NULL
;
127 for (usp
=validated_users
;usp
;usp
=next
) {
130 invalidate_vuid(usp
->vuid
);
135 * register that a valid login has been performed, establish 'session'.
136 * @param server_info The token returned from the authentication process.
137 * (now 'owned' by register_vuid)
139 * @param session_key The User session key for the login session (now also
140 * 'owned' by register_vuid)
142 * @param respose_blob The NT challenge-response, if available. (May be
143 * freed after this call)
145 * @param smb_name The untranslated name of the user
147 * @return Newly allocated vuid, biased by an offset. (This allows us to
148 * tell random client vuid's (normally zero) from valid vuids.)
152 int register_vuid(auth_serversupplied_info
*server_info
,
153 DATA_BLOB session_key
, DATA_BLOB response_blob
,
154 const char *smb_name
)
156 user_struct
*vuser
= NULL
;
158 /* Paranoia check. */
159 if(lp_security() == SEC_SHARE
) {
160 smb_panic("Tried to register uid in security=share\n");
163 /* Limit allowed vuids to 16bits - VUID_OFFSET. */
164 if (num_validated_vuids
>= 0xFFFF-VUID_OFFSET
) {
165 data_blob_free(&session_key
);
166 return UID_FIELD_INVALID
;
169 if((vuser
= SMB_MALLOC_P(user_struct
)) == NULL
) {
170 DEBUG(0,("Failed to malloc users struct!\n"));
171 data_blob_free(&session_key
);
172 return UID_FIELD_INVALID
;
177 /* Allocate a free vuid. Yes this is a linear search... :-) */
178 while( get_valid_user_struct(next_vuid
) != NULL
) {
180 /* Check for vuid wrap. */
181 if (next_vuid
== UID_FIELD_INVALID
)
182 next_vuid
= VUID_OFFSET
;
185 DEBUG(10,("register_vuid: allocated vuid = %u\n",
186 (unsigned int)next_vuid
));
188 vuser
->vuid
= next_vuid
;
192 * This happens in an unfinished NTLMSSP session setup. We
193 * need to allocate a vuid between the first and second calls
197 num_validated_vuids
++;
199 vuser
->server_info
= NULL
;
201 DLIST_ADD(validated_users
, vuser
);
206 /* the next functions should be done by a SID mapping system (SMS) as
207 * the new real sam db won't have reference to unix uids or gids
210 vuser
->uid
= server_info
->uid
;
211 vuser
->gid
= server_info
->gid
;
213 vuser
->n_groups
= server_info
->n_groups
;
214 if (vuser
->n_groups
) {
215 if (!(vuser
->groups
= (gid_t
*)memdup(server_info
->groups
,
218 DEBUG(0,("register_vuid: failed to memdup "
220 data_blob_free(&session_key
);
222 TALLOC_FREE(server_info
);
223 return UID_FIELD_INVALID
;
227 vuser
->guest
= server_info
->guest
;
228 fstrcpy(vuser
->user
.unix_name
, server_info
->unix_name
);
230 /* This is a potentially untrusted username */
231 alpha_strcpy(vuser
->user
.smb_name
, smb_name
, ". _-$",
232 sizeof(vuser
->user
.smb_name
));
234 fstrcpy(vuser
->user
.domain
, pdb_get_domain(server_info
->sam_account
));
235 fstrcpy(vuser
->user
.full_name
,
236 pdb_get_fullname(server_info
->sam_account
));
239 /* Keep the homedir handy */
240 const char *homedir
=
241 pdb_get_homedir(server_info
->sam_account
);
242 const char *logon_script
=
243 pdb_get_logon_script(server_info
->sam_account
);
245 if (!IS_SAM_DEFAULT(server_info
->sam_account
,
247 const char *unix_homedir
=
248 pdb_get_unix_homedir(server_info
->sam_account
);
250 vuser
->unix_homedir
=
251 smb_xstrdup(unix_homedir
);
254 struct passwd
*passwd
=
255 getpwnam_alloc(NULL
, vuser
->user
.unix_name
);
257 vuser
->unix_homedir
=
258 smb_xstrdup(passwd
->pw_dir
);
264 vuser
->homedir
= smb_xstrdup(homedir
);
267 vuser
->logon_script
= smb_xstrdup(logon_script
);
271 vuser
->session_key
= session_key
;
273 DEBUG(10,("register_vuid: (%u,%u) %s %s %s guest=%d\n",
274 (unsigned int)vuser
->uid
,
275 (unsigned int)vuser
->gid
,
276 vuser
->user
.unix_name
, vuser
->user
.smb_name
,
277 vuser
->user
.domain
, vuser
->guest
));
279 DEBUG(3, ("User name: %s\tReal name: %s\n", vuser
->user
.unix_name
,
280 vuser
->user
.full_name
));
282 if (server_info
->ptok
) {
283 vuser
->nt_user_token
= dup_nt_token(NULL
, server_info
->ptok
);
285 DEBUG(1, ("server_info does not contain a user_token - "
286 "cannot continue\n"));
287 TALLOC_FREE(server_info
);
288 data_blob_free(&session_key
);
289 SAFE_FREE(vuser
->homedir
);
290 SAFE_FREE(vuser
->unix_homedir
);
291 SAFE_FREE(vuser
->logon_script
);
294 return UID_FIELD_INVALID
;
297 /* use this to keep tabs on all our info from the authentication */
298 vuser
->server_info
= server_info
;
300 DEBUG(3,("UNIX uid %d is UNIX user %s, and will be vuid %u\n",
301 (int)vuser
->uid
,vuser
->user
.unix_name
, vuser
->vuid
));
304 num_validated_vuids
++;
306 DLIST_ADD(validated_users
, vuser
);
308 if (!session_claim(vuser
)) {
309 DEBUG(1, ("Failed to claim session for vuid=%d\n",
311 invalidate_vuid(vuser
->vuid
);
312 return UID_FIELD_INVALID
;
315 /* Register a home dir service for this user iff
317 (a) This is not a guest connection,
318 (b) we have a home directory defined
319 (c) there s not an existing static share by that name
321 If a share exists by this name (autoloaded or not) reuse it . */
323 vuser
->homes_snum
= -1;
325 if ( (!vuser
->guest
) && vuser
->unix_homedir
&& *(vuser
->unix_homedir
))
327 int servicenumber
= lp_servicenumber(vuser
->user
.unix_name
);
329 if ( servicenumber
== -1 ) {
330 DEBUG(3, ("Adding homes service for user '%s' using "
331 "home directory: '%s'\n",
332 vuser
->user
.unix_name
, vuser
->unix_homedir
));
334 add_home_service(vuser
->user
.unix_name
,
335 vuser
->user
.unix_name
,
336 vuser
->unix_homedir
);
338 DEBUG(3, ("Using static (or previously created) "
339 "service for user '%s'; path = '%s'\n",
340 vuser
->user
.unix_name
,
341 lp_pathname(servicenumber
) ));
342 vuser
->homes_snum
= servicenumber
;
346 if (srv_is_signing_negotiated() && !vuser
->guest
&&
347 !srv_signing_started()) {
348 /* Try and turn on server signing on the first non-guest
350 srv_set_signing(vuser
->session_key
, response_blob
);
353 /* fill in the current_user_info struct */
354 set_current_user_info( &vuser
->user
);
360 /****************************************************************************
361 Add a name to the session users list.
362 ****************************************************************************/
364 void add_session_user(const char *user
)
367 struct passwd
*passwd
;
369 if (!(passwd
= Get_Pwnam(user
)))
372 fstrcpy(suser
,passwd
->pw_name
);
377 if( session_userlist
&& in_list(suser
,session_userlist
,False
) )
380 if( !session_userlist
||
381 (strlen(suser
) + strlen(session_userlist
) + 2 >=
382 len_session_userlist
) ) {
385 if (len_session_userlist
> 128 * PSTRING_LEN
) {
386 DEBUG(3,("add_session_user: session userlist already "
390 newlist
= (char *)SMB_REALLOC_KEEP_OLD_ON_ERROR(
392 len_session_userlist
+ PSTRING_LEN
);
393 if( newlist
== NULL
) {
394 DEBUG(1,("Unable to resize session_userlist\n"));
397 if (!session_userlist
) {
400 session_userlist
= newlist
;
401 len_session_userlist
+= PSTRING_LEN
;
404 safe_strcat(session_userlist
," ",len_session_userlist
-1);
405 safe_strcat(session_userlist
,suser
,len_session_userlist
-1);
408 /****************************************************************************
409 Check if a user is in a netgroup user list. If at first we don't succeed,
411 ****************************************************************************/
413 BOOL
user_in_netgroup(const char *user
, const char *ngname
)
416 static char *mydomain
= NULL
;
417 fstring lowercase_user
;
419 if (mydomain
== NULL
)
420 yp_get_default_domain(&mydomain
);
422 if(mydomain
== NULL
) {
423 DEBUG(5,("Unable to get default yp domain, let's try without specifying it\n"));
426 DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
427 user
, mydomain
?mydomain
:"(ANY)", ngname
));
429 if (innetgr(ngname
, NULL
, user
, mydomain
)) {
430 DEBUG(5,("user_in_netgroup: Found\n"));
435 * Ok, innetgr is case sensitive. Try once more with lowercase
436 * just in case. Attempt to fix #703. JRA.
439 fstrcpy(lowercase_user
, user
);
440 strlower_m(lowercase_user
);
442 DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
443 lowercase_user
, mydomain
?mydomain
:"(ANY)", ngname
));
445 if (innetgr(ngname
, NULL
, lowercase_user
, mydomain
)) {
446 DEBUG(5,("user_in_netgroup: Found\n"));
450 #endif /* HAVE_NETGROUP */
454 /****************************************************************************
455 Check if a user is in a user list - can check combinations of UNIX
457 ****************************************************************************/
459 BOOL
user_in_list(const char *user
,const char **list
)
464 DEBUG(10,("user_in_list: checking user %s in list\n", user
));
468 DEBUG(10,("user_in_list: checking user |%s| against |%s|\n",
472 * Check raw username.
474 if (strequal(user
, *list
))
478 * Now check to see if any combination
479 * of UNIX and netgroups has been specified.
484 * Old behaviour. Check netgroup list
485 * followed by UNIX list.
487 if(user_in_netgroup(user
, *list
+1))
489 if(user_in_group(user
, *list
+1))
491 } else if (**list
== '+') {
493 if((*(*list
+1)) == '&') {
495 * Search UNIX list followed by netgroup.
497 if(user_in_group(user
, *list
+2))
499 if(user_in_netgroup(user
, *list
+2))
505 * Just search UNIX list.
508 if(user_in_group(user
, *list
+1))
512 } else if (**list
== '&') {
514 if(*(*list
+1) == '+') {
516 * Search netgroup list followed by UNIX list.
518 if(user_in_netgroup(user
, *list
+2))
520 if(user_in_group(user
, *list
+2))
524 * Just search netgroup list.
526 if(user_in_netgroup(user
, *list
+1))
536 /****************************************************************************
537 Check if a username is valid.
538 ****************************************************************************/
540 static BOOL
user_ok(const char *user
, int snum
)
542 char **valid
, **invalid
;
545 valid
= invalid
= NULL
;
548 if (lp_invalid_users(snum
)) {
549 str_list_copy(&invalid
, lp_invalid_users(snum
));
551 str_list_substitute(invalid
, "%S", lp_servicename(snum
))) {
553 str_list_sub_basic(invalid
,
554 current_user_info
.smb_name
) ) {
555 ret
= !user_in_list(user
,
556 (const char **)invalid
);
561 str_list_free (&invalid
);
563 if (ret
&& lp_valid_users(snum
)) {
564 str_list_copy(&valid
, lp_valid_users(snum
));
566 str_list_substitute(valid
, "%S", lp_servicename(snum
)) ) {
568 str_list_sub_basic(valid
,
569 current_user_info
.smb_name
) ) {
570 ret
= user_in_list(user
, (const char **)valid
);
575 str_list_free (&valid
);
577 if (ret
&& lp_onlyuser(snum
)) {
578 char **user_list
= str_list_make (lp_username(snum
), NULL
);
580 str_list_substitute(user_list
, "%S",
581 lp_servicename(snum
))) {
582 ret
= user_in_list(user
, (const char **)user_list
);
584 if (user_list
) str_list_free (&user_list
);
590 /****************************************************************************
591 Validate a group username entry. Return the username or NULL.
592 ****************************************************************************/
594 static char *validate_group(char *group
, DATA_BLOB password
,int snum
)
598 char *host
, *user
, *domain
;
600 while (getnetgrent(&host
, &user
, &domain
)) {
602 if (user_ok(user
, snum
) &&
603 password_ok(user
,password
)) {
617 while ((gptr
= (struct group
*)getgrent())) {
618 if (strequal(gptr
->gr_name
,group
))
623 * As user_ok can recurse doing a getgrent(), we must
624 * copy the member list into a pstring on the stack before
625 * use. Bug pointed out by leon@eatworms.swmed.edu.
631 size_t copied_len
= 0;
635 member
= member_list
;
637 for(i
= 0; gptr
->gr_mem
&& gptr
->gr_mem
[i
]; i
++) {
638 size_t member_len
= strlen(gptr
->gr_mem
[i
])+1;
639 if(copied_len
+member_len
< sizeof(pstring
)) {
641 DEBUG(10,("validate_group: = gr_mem = "
642 "%s\n", gptr
->gr_mem
[i
]));
644 safe_strcpy(member
, gptr
->gr_mem
[i
],
647 copied_len
+= member_len
;
648 member
+= copied_len
;
656 member
= member_list
;
659 fstrcpy(name
,member
);
660 if (user_ok(name
,snum
) &&
661 password_ok(name
,password
)) {
666 DEBUG(10,("validate_group = member = %s\n",
669 member
+= strlen(member
) + 1;
680 /****************************************************************************
681 Check for authority to login to a service with a given username/password.
682 Note this is *NOT* used when logging on using sessionsetup_and_X.
683 ****************************************************************************/
685 BOOL
authorise_login(int snum
, fstring user
, DATA_BLOB password
,
690 #ifdef DEBUG_PASSWORD
691 DEBUG(100,("authorise_login: checking authorisation on "
692 "user=%s pass=%s\n", user
,password
.data
));
697 /* there are several possibilities:
698 1) login as the given user with given password
699 2) login as a previously registered username with the given
701 3) login as a session list username with the given password
702 4) login as a previously validated user/password pair
703 5) login as the "user =" user with given password
704 6) login as the "user =" user with no password
706 7) login as guest user with no password
708 if the service is guest_only then steps 1 to 5 are skipped
711 /* now check the list of session users */
714 char *user_list
= NULL
;
716 if ( session_userlist
)
717 user_list
= SMB_STRDUP(session_userlist
);
719 user_list
= SMB_STRDUP("");
724 for (auser
=strtok(user_list
,LIST_SEP
); !ok
&& auser
;
725 auser
= strtok(NULL
,LIST_SEP
)) {
727 fstrcpy(user2
,auser
);
728 if (!user_ok(user2
,snum
))
731 if (password_ok(user2
,password
)) {
734 DEBUG(3,("authorise_login: ACCEPTED: session "
735 "list username (%s) and given "
736 "password ok\n", user
));
740 SAFE_FREE(user_list
);
743 /* check the user= fields and the given password */
744 if (!ok
&& lp_username(snum
)) {
747 pstrcpy(user_list
,lp_username(snum
));
749 pstring_sub(user_list
,"%S",lp_servicename(snum
));
751 for (auser
=strtok(user_list
,LIST_SEP
); auser
&& !ok
;
752 auser
= strtok(NULL
,LIST_SEP
)) {
754 auser
= validate_group(auser
+1,password
,snum
);
758 DEBUG(3,("authorise_login: ACCEPTED: "
759 "group username and given "
760 "password ok (%s)\n", user
));
764 fstrcpy(user2
,auser
);
765 if (user_ok(user2
,snum
) &&
766 password_ok(user2
,password
)) {
769 DEBUG(3,("authorise_login: ACCEPTED: "
770 "user list username and "
771 "given password ok (%s)\n",
778 /* check for a normal guest connection */
779 if (!ok
&& GUEST_OK(snum
)) {
781 fstrcpy(guestname
,lp_guestaccount());
782 if (Get_Pwnam(guestname
)) {
783 fstrcpy(user
,guestname
);
785 DEBUG(3,("authorise_login: ACCEPTED: guest account "
786 "and guest ok (%s)\n", user
));
788 DEBUG(0,("authorise_login: Invalid guest account "
789 "%s??\n",guestname
));
794 if (ok
&& !user_ok(user
, snum
)) {
795 DEBUG(0,("authorise_login: rejected invalid user %s\n",user
));