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;
26 /* workgroup from session setup. */
27 static char *session_workgroup
= NULL
;
29 /* this holds info on user ids that are already validated for this VC */
30 static user_struct
*validated_users
;
31 static int next_vuid
= VUID_OFFSET
;
32 static int num_validated_vuids
;
34 /****************************************************************************
35 Check if a uid has been validated, and return an pointer to the user_struct
36 if it has. NULL if not. vuid is biased by an offset. This allows us to
37 tell random client vuid's (normally zero) from valid vuids.
38 ****************************************************************************/
40 user_struct
*get_valid_user_struct(uint16 vuid
)
45 if (vuid
== UID_FIELD_INVALID
)
48 for (usp
=validated_users
;usp
;usp
=usp
->next
,count
++) {
49 if (vuid
== usp
->vuid
&& usp
->server_info
) {
51 DLIST_PROMOTE(validated_users
, usp
);
60 /****************************************************************************
61 Get the user struct of a partial NTLMSSP login
62 ****************************************************************************/
64 user_struct
*get_partial_auth_user_struct(uint16 vuid
)
69 if (vuid
== UID_FIELD_INVALID
)
72 for (usp
=validated_users
;usp
;usp
=usp
->next
,count
++) {
73 if (vuid
== usp
->vuid
&& !usp
->server_info
) {
75 DLIST_PROMOTE(validated_users
, usp
);
84 /****************************************************************************
86 ****************************************************************************/
88 void invalidate_vuid(uint16 vuid
)
90 user_struct
*vuser
= get_valid_user_struct(vuid
);
97 data_blob_free(&vuser
->session_key
);
99 DLIST_REMOVE(validated_users
, vuser
);
101 /* clear the vuid from the 'cache' on each connection, and
102 from the vuid 'owner' of connections */
103 conn_clear_vuid_cache(vuid
);
106 num_validated_vuids
--;
109 /****************************************************************************
110 Invalidate all vuid entries for this process.
111 ****************************************************************************/
113 void invalidate_all_vuids(void)
115 user_struct
*usp
, *next
=NULL
;
117 for (usp
=validated_users
;usp
;usp
=next
) {
120 invalidate_vuid(usp
->vuid
);
125 * register that a valid login has been performed, establish 'session'.
126 * @param server_info The token returned from the authentication process.
127 * (now 'owned' by register_vuid)
129 * @param session_key The User session key for the login session (now also
130 * 'owned' by register_vuid)
132 * @param respose_blob The NT challenge-response, if available. (May be
133 * freed after this call)
135 * @param smb_name The untranslated name of the user
137 * @return Newly allocated vuid, biased by an offset. (This allows us to
138 * tell random client vuid's (normally zero) from valid vuids.)
142 int register_vuid(auth_serversupplied_info
*server_info
,
143 DATA_BLOB session_key
, DATA_BLOB response_blob
,
144 const char *smb_name
)
148 /* Paranoia check. */
149 if(lp_security() == SEC_SHARE
) {
150 smb_panic("Tried to register uid in security=share\n");
153 /* Limit allowed vuids to 16bits - VUID_OFFSET. */
154 if (num_validated_vuids
>= 0xFFFF-VUID_OFFSET
) {
155 data_blob_free(&session_key
);
156 return UID_FIELD_INVALID
;
159 if((vuser
= talloc_zero(NULL
, user_struct
)) == NULL
) {
160 DEBUG(0,("Failed to talloc users struct!\n"));
161 data_blob_free(&session_key
);
162 return UID_FIELD_INVALID
;
165 /* Allocate a free vuid. Yes this is a linear search... :-) */
166 while( get_valid_user_struct(next_vuid
) != NULL
) {
168 /* Check for vuid wrap. */
169 if (next_vuid
== UID_FIELD_INVALID
)
170 next_vuid
= VUID_OFFSET
;
173 DEBUG(10,("register_vuid: allocated vuid = %u\n",
174 (unsigned int)next_vuid
));
176 vuser
->vuid
= next_vuid
;
180 * This happens in an unfinished NTLMSSP session setup. We
181 * need to allocate a vuid between the first and second calls
185 num_validated_vuids
++;
187 vuser
->server_info
= NULL
;
189 DLIST_ADD(validated_users
, vuser
);
194 /* use this to keep tabs on all our info from the authentication */
195 vuser
->server_info
= server_info
;
196 /* Ensure that the server_info will dissapear with the vuser it is now attached to */
197 talloc_steal(vuser
, vuser
->server_info
);
199 /* the next functions should be done by a SID mapping system (SMS) as
200 * the new real sam db won't have reference to unix uids or gids
203 vuser
->uid
= server_info
->uid
;
204 vuser
->gid
= server_info
->gid
;
206 vuser
->n_groups
= server_info
->n_groups
;
207 if (vuser
->n_groups
) {
208 if (!(vuser
->groups
= (gid_t
*)talloc_memdup(vuser
, server_info
->groups
,
211 DEBUG(0,("register_vuid: failed to talloc_memdup "
213 data_blob_free(&session_key
);
215 return UID_FIELD_INVALID
;
219 vuser
->guest
= server_info
->guest
;
220 fstrcpy(vuser
->user
.unix_name
, server_info
->unix_name
);
222 /* This is a potentially untrusted username */
223 alpha_strcpy(vuser
->user
.smb_name
, smb_name
, ". _-$",
224 sizeof(vuser
->user
.smb_name
));
226 fstrcpy(vuser
->user
.domain
, pdb_get_domain(server_info
->sam_account
));
227 fstrcpy(vuser
->user
.full_name
,
228 pdb_get_fullname(server_info
->sam_account
));
231 /* Keep the homedir handy */
232 const char *homedir
=
233 pdb_get_homedir(server_info
->sam_account
);
234 const char *logon_script
=
235 pdb_get_logon_script(server_info
->sam_account
);
237 if (!IS_SAM_DEFAULT(server_info
->sam_account
,
239 const char *unix_homedir
=
240 pdb_get_unix_homedir(server_info
->sam_account
);
242 vuser
->unix_homedir
= unix_homedir
;
245 struct passwd
*passwd
=
246 getpwnam_alloc(vuser
, vuser
->user
.unix_name
);
248 vuser
->unix_homedir
= passwd
->pw_dir
;
249 /* Ensure that the unix_homedir now
250 * belongs to vuser, so it goes away
251 * with it, not with passwd below: */
252 talloc_steal(vuser
, vuser
->unix_homedir
);
258 vuser
->homedir
= homedir
;
261 vuser
->logon_script
= logon_script
;
265 vuser
->session_key
= session_key
;
267 DEBUG(10,("register_vuid: (%u,%u) %s %s %s guest=%d\n",
268 (unsigned int)vuser
->uid
,
269 (unsigned int)vuser
->gid
,
270 vuser
->user
.unix_name
, vuser
->user
.smb_name
,
271 vuser
->user
.domain
, vuser
->guest
));
273 DEBUG(3, ("User name: %s\tReal name: %s\n", vuser
->user
.unix_name
,
274 vuser
->user
.full_name
));
276 if (server_info
->ptok
) {
277 vuser
->nt_user_token
= dup_nt_token(vuser
, server_info
->ptok
);
279 DEBUG(1, ("server_info does not contain a user_token - "
280 "cannot continue\n"));
282 data_blob_free(&session_key
);
283 return UID_FIELD_INVALID
;
286 DEBUG(3,("UNIX uid %d is UNIX user %s, and will be vuid %u\n",
287 (int)vuser
->uid
,vuser
->user
.unix_name
, vuser
->vuid
));
290 num_validated_vuids
++;
292 DLIST_ADD(validated_users
, vuser
);
294 if (!session_claim(vuser
)) {
295 DEBUG(1, ("Failed to claim session for vuid=%d\n",
297 invalidate_vuid(vuser
->vuid
);
298 return UID_FIELD_INVALID
;
301 /* Register a home dir service for this user iff
303 (a) This is not a guest connection,
304 (b) we have a home directory defined
305 (c) there s not an existing static share by that name
307 If a share exists by this name (autoloaded or not) reuse it . */
309 vuser
->homes_snum
= -1;
311 if ( (!vuser
->guest
) && vuser
->unix_homedir
&& *(vuser
->unix_homedir
))
313 int servicenumber
= lp_servicenumber(vuser
->user
.unix_name
);
315 if ( servicenumber
== -1 ) {
316 DEBUG(3, ("Adding homes service for user '%s' using "
317 "home directory: '%s'\n",
318 vuser
->user
.unix_name
, vuser
->unix_homedir
));
320 add_home_service(vuser
->user
.unix_name
,
321 vuser
->user
.unix_name
,
322 vuser
->unix_homedir
);
324 DEBUG(3, ("Using static (or previously created) "
325 "service for user '%s'; path = '%s'\n",
326 vuser
->user
.unix_name
,
327 lp_pathname(servicenumber
) ));
328 vuser
->homes_snum
= servicenumber
;
332 if (srv_is_signing_negotiated() && !vuser
->guest
&&
333 !srv_signing_started()) {
334 /* Try and turn on server signing on the first non-guest
336 srv_set_signing(vuser
->session_key
, response_blob
);
339 /* fill in the current_user_info struct */
340 set_current_user_info( &vuser
->user
);
346 /****************************************************************************
347 Add a name to the session users list.
348 ****************************************************************************/
350 void add_session_user(const char *user
)
353 struct passwd
*passwd
;
355 if (!(passwd
= Get_Pwnam(user
)))
358 fstrcpy(suser
,passwd
->pw_name
);
363 if( session_userlist
&& in_list(suser
,session_userlist
,False
) )
366 if( !session_userlist
||
367 (strlen(suser
) + strlen(session_userlist
) + 2 >=
368 len_session_userlist
) ) {
371 if (len_session_userlist
> 128 * PSTRING_LEN
) {
372 DEBUG(3,("add_session_user: session userlist already "
376 newlist
= (char *)SMB_REALLOC_KEEP_OLD_ON_ERROR(
378 len_session_userlist
+ PSTRING_LEN
);
379 if( newlist
== NULL
) {
380 DEBUG(1,("Unable to resize session_userlist\n"));
383 if (!session_userlist
) {
386 session_userlist
= newlist
;
387 len_session_userlist
+= PSTRING_LEN
;
390 safe_strcat(session_userlist
," ",len_session_userlist
-1);
391 safe_strcat(session_userlist
,suser
,len_session_userlist
-1);
394 /****************************************************************************
395 In security=share mode we need to store the client workgroup, as that's
396 what Vista uses for the NTLMv2 calculation.
397 ****************************************************************************/
399 void add_session_workgroup(const char *workgroup
)
401 if (session_workgroup
) {
402 SAFE_FREE(session_workgroup
);
404 session_workgroup
= smb_xstrdup(workgroup
);
407 /****************************************************************************
408 In security=share mode we need to return the client workgroup, as that's
409 what Vista uses for the NTLMv2 calculation.
410 ****************************************************************************/
412 const char *get_session_workgroup(void)
414 return session_workgroup
;
417 /****************************************************************************
418 Check if a user is in a netgroup user list. If at first we don't succeed,
420 ****************************************************************************/
422 BOOL
user_in_netgroup(const char *user
, const char *ngname
)
425 static char *mydomain
= NULL
;
426 fstring lowercase_user
;
428 if (mydomain
== NULL
)
429 yp_get_default_domain(&mydomain
);
431 if(mydomain
== NULL
) {
432 DEBUG(5,("Unable to get default yp domain, let's try without specifying it\n"));
435 DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
436 user
, mydomain
?mydomain
:"(ANY)", ngname
));
438 if (innetgr(ngname
, NULL
, user
, mydomain
)) {
439 DEBUG(5,("user_in_netgroup: Found\n"));
444 * Ok, innetgr is case sensitive. Try once more with lowercase
445 * just in case. Attempt to fix #703. JRA.
448 fstrcpy(lowercase_user
, user
);
449 strlower_m(lowercase_user
);
451 DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
452 lowercase_user
, mydomain
?mydomain
:"(ANY)", ngname
));
454 if (innetgr(ngname
, NULL
, lowercase_user
, mydomain
)) {
455 DEBUG(5,("user_in_netgroup: Found\n"));
459 #endif /* HAVE_NETGROUP */
463 /****************************************************************************
464 Check if a user is in a user list - can check combinations of UNIX
466 ****************************************************************************/
468 BOOL
user_in_list(const char *user
,const char **list
)
473 DEBUG(10,("user_in_list: checking user %s in list\n", user
));
477 DEBUG(10,("user_in_list: checking user |%s| against |%s|\n",
481 * Check raw username.
483 if (strequal(user
, *list
))
487 * Now check to see if any combination
488 * of UNIX and netgroups has been specified.
493 * Old behaviour. Check netgroup list
494 * followed by UNIX list.
496 if(user_in_netgroup(user
, *list
+1))
498 if(user_in_group(user
, *list
+1))
500 } else if (**list
== '+') {
502 if((*(*list
+1)) == '&') {
504 * Search UNIX list followed by netgroup.
506 if(user_in_group(user
, *list
+2))
508 if(user_in_netgroup(user
, *list
+2))
514 * Just search UNIX list.
517 if(user_in_group(user
, *list
+1))
521 } else if (**list
== '&') {
523 if(*(*list
+1) == '+') {
525 * Search netgroup list followed by UNIX list.
527 if(user_in_netgroup(user
, *list
+2))
529 if(user_in_group(user
, *list
+2))
533 * Just search netgroup list.
535 if(user_in_netgroup(user
, *list
+1))
545 /****************************************************************************
546 Check if a username is valid.
547 ****************************************************************************/
549 static BOOL
user_ok(const char *user
, int snum
)
551 char **valid
, **invalid
;
554 valid
= invalid
= NULL
;
557 if (lp_invalid_users(snum
)) {
558 str_list_copy(&invalid
, lp_invalid_users(snum
));
560 str_list_substitute(invalid
, "%S", lp_servicename(snum
))) {
562 /* This is used in sec=share only, so no current user
563 * around to pass to str_list_sub_basic() */
565 if ( invalid
&& str_list_sub_basic(invalid
, "", "") ) {
566 ret
= !user_in_list(user
,
567 (const char **)invalid
);
572 str_list_free (&invalid
);
574 if (ret
&& lp_valid_users(snum
)) {
575 str_list_copy(&valid
, lp_valid_users(snum
));
577 str_list_substitute(valid
, "%S", lp_servicename(snum
)) ) {
579 /* This is used in sec=share only, so no current user
580 * around to pass to str_list_sub_basic() */
582 if ( valid
&& str_list_sub_basic(valid
, "", "") ) {
583 ret
= user_in_list(user
, (const char **)valid
);
588 str_list_free (&valid
);
590 if (ret
&& lp_onlyuser(snum
)) {
591 char **user_list
= str_list_make (lp_username(snum
), NULL
);
593 str_list_substitute(user_list
, "%S",
594 lp_servicename(snum
))) {
595 ret
= user_in_list(user
, (const char **)user_list
);
597 if (user_list
) str_list_free (&user_list
);
603 /****************************************************************************
604 Validate a group username entry. Return the username or NULL.
605 ****************************************************************************/
607 static char *validate_group(char *group
, DATA_BLOB password
,int snum
)
611 char *host
, *user
, *domain
;
613 while (getnetgrent(&host
, &user
, &domain
)) {
615 if (user_ok(user
, snum
) &&
616 password_ok(user
,password
)) {
630 while ((gptr
= (struct group
*)getgrent())) {
631 if (strequal(gptr
->gr_name
,group
))
636 * As user_ok can recurse doing a getgrent(), we must
637 * copy the member list into a pstring on the stack before
638 * use. Bug pointed out by leon@eatworms.swmed.edu.
644 size_t copied_len
= 0;
648 member
= member_list
;
650 for(i
= 0; gptr
->gr_mem
&& gptr
->gr_mem
[i
]; i
++) {
651 size_t member_len
= strlen(gptr
->gr_mem
[i
])+1;
652 if(copied_len
+member_len
< sizeof(pstring
)) {
654 DEBUG(10,("validate_group: = gr_mem = "
655 "%s\n", gptr
->gr_mem
[i
]));
657 safe_strcpy(member
, gptr
->gr_mem
[i
],
660 copied_len
+= member_len
;
661 member
+= copied_len
;
669 member
= member_list
;
672 fstrcpy(name
,member
);
673 if (user_ok(name
,snum
) &&
674 password_ok(name
,password
)) {
679 DEBUG(10,("validate_group = member = %s\n",
682 member
+= strlen(member
) + 1;
693 /****************************************************************************
694 Check for authority to login to a service with a given username/password.
695 Note this is *NOT* used when logging on using sessionsetup_and_X.
696 ****************************************************************************/
698 BOOL
authorise_login(int snum
, fstring user
, DATA_BLOB password
,
703 #ifdef DEBUG_PASSWORD
704 DEBUG(100,("authorise_login: checking authorisation on "
705 "user=%s pass=%s\n", user
,password
.data
));
710 /* there are several possibilities:
711 1) login as the given user with given password
712 2) login as a previously registered username with the given
714 3) login as a session list username with the given password
715 4) login as a previously validated user/password pair
716 5) login as the "user =" user with given password
717 6) login as the "user =" user with no password
719 7) login as guest user with no password
721 if the service is guest_only then steps 1 to 5 are skipped
724 /* now check the list of session users */
727 char *user_list
= NULL
;
729 if ( session_userlist
)
730 user_list
= SMB_STRDUP(session_userlist
);
732 user_list
= SMB_STRDUP("");
737 for (auser
=strtok(user_list
,LIST_SEP
); !ok
&& auser
;
738 auser
= strtok(NULL
,LIST_SEP
)) {
740 fstrcpy(user2
,auser
);
741 if (!user_ok(user2
,snum
))
744 if (password_ok(user2
,password
)) {
747 DEBUG(3,("authorise_login: ACCEPTED: session "
748 "list username (%s) and given "
749 "password ok\n", user
));
753 SAFE_FREE(user_list
);
756 /* check the user= fields and the given password */
757 if (!ok
&& lp_username(snum
)) {
760 pstrcpy(user_list
,lp_username(snum
));
762 pstring_sub(user_list
,"%S",lp_servicename(snum
));
764 for (auser
=strtok(user_list
,LIST_SEP
); auser
&& !ok
;
765 auser
= strtok(NULL
,LIST_SEP
)) {
767 auser
= validate_group(auser
+1,password
,snum
);
771 DEBUG(3,("authorise_login: ACCEPTED: "
772 "group username and given "
773 "password ok (%s)\n", user
));
777 fstrcpy(user2
,auser
);
778 if (user_ok(user2
,snum
) &&
779 password_ok(user2
,password
)) {
782 DEBUG(3,("authorise_login: ACCEPTED: "
783 "user list username and "
784 "given password ok (%s)\n",
791 /* check for a normal guest connection */
792 if (!ok
&& GUEST_OK(snum
)) {
794 fstrcpy(guestname
,lp_guestaccount());
795 if (Get_Pwnam(guestname
)) {
796 fstrcpy(user
,guestname
);
798 DEBUG(3,("authorise_login: ACCEPTED: guest account "
799 "and guest ok (%s)\n", user
));
801 DEBUG(0,("authorise_login: Invalid guest account "
802 "%s??\n",guestname
));
807 if (ok
&& !user_ok(user
, snum
)) {
808 DEBUG(0,("authorise_login: rejected invalid user %s\n",user
));