2 Unix SMB/CIFS implementation.
3 Password and authentication handling
4 Copyright (C) Andrew Tridgell 1992-1998
5 Copyright (C) Jeremy Allison 2007.
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.
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.
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/>.
22 #include "smbd/globals.h"
23 #include "../librpc/gen_ndr/netlogon.h"
25 /* Fix up prototypes for OSX 10.4, where they're missing */
26 #ifndef HAVE_SETNETGRENT_PROTOTYPE
27 extern int setnetgrent(const char* netgroup
);
29 #ifndef HAVE_GETNETGRENT_PROTOTYPE
30 extern int getnetgrent(char **host
, char **user
, char **domain
);
32 #ifndef HAVE_ENDNETGRENT_PROTOTYPE
33 extern void endnetgrent(void);
36 enum server_allocated_state
{ SERVER_ALLOCATED_REQUIRED_YES
,
37 SERVER_ALLOCATED_REQUIRED_NO
,
38 SERVER_ALLOCATED_REQUIRED_ANY
};
40 static user_struct
*get_valid_user_struct_internal(
41 struct smbd_server_connection
*sconn
,
43 enum server_allocated_state server_allocated
)
48 if (vuid
== UID_FIELD_INVALID
)
51 usp
=sconn
->smb1
.sessions
.validated_users
;
52 for (;usp
;usp
=usp
->next
,count
++) {
53 if (vuid
== usp
->vuid
) {
54 switch (server_allocated
) {
55 case SERVER_ALLOCATED_REQUIRED_YES
:
56 if (usp
->server_info
== NULL
) {
60 case SERVER_ALLOCATED_REQUIRED_NO
:
61 if (usp
->server_info
!= NULL
) {
64 case SERVER_ALLOCATED_REQUIRED_ANY
:
68 DLIST_PROMOTE(sconn
->smb1
.sessions
.validated_users
,
78 /****************************************************************************
79 Check if a uid has been validated, and return an pointer to the user_struct
80 if it has. NULL if not. vuid is biased by an offset. This allows us to
81 tell random client vuid's (normally zero) from valid vuids.
82 ****************************************************************************/
84 user_struct
*get_valid_user_struct(struct smbd_server_connection
*sconn
,
87 return get_valid_user_struct_internal(sconn
, vuid
,
88 SERVER_ALLOCATED_REQUIRED_YES
);
91 bool is_partial_auth_vuid(struct smbd_server_connection
*sconn
, uint16 vuid
)
93 return (get_partial_auth_user_struct(sconn
, vuid
) != NULL
);
96 /****************************************************************************
97 Get the user struct of a partial NTLMSSP login
98 ****************************************************************************/
100 user_struct
*get_partial_auth_user_struct(struct smbd_server_connection
*sconn
,
103 return get_valid_user_struct_internal(sconn
, vuid
,
104 SERVER_ALLOCATED_REQUIRED_NO
);
107 /****************************************************************************
109 ****************************************************************************/
111 void invalidate_vuid(struct smbd_server_connection
*sconn
, uint16 vuid
)
113 user_struct
*vuser
= NULL
;
115 vuser
= get_valid_user_struct_internal(sconn
, vuid
,
116 SERVER_ALLOCATED_REQUIRED_ANY
);
121 session_yield(vuser
);
123 if (vuser
->auth_ntlmssp_state
) {
124 TALLOC_FREE(vuser
->auth_ntlmssp_state
);
127 DLIST_REMOVE(sconn
->smb1
.sessions
.validated_users
, vuser
);
129 /* clear the vuid from the 'cache' on each connection, and
130 from the vuid 'owner' of connections */
131 conn_clear_vuid_caches(sconn
, vuid
);
134 sconn
->smb1
.sessions
.num_validated_vuids
--;
137 /****************************************************************************
138 Invalidate all vuid entries for this process.
139 ****************************************************************************/
141 void invalidate_all_vuids(struct smbd_server_connection
*sconn
)
143 if (sconn
->using_smb2
) {
147 while (sconn
->smb1
.sessions
.validated_users
!= NULL
) {
148 invalidate_vuid(sconn
,
149 sconn
->smb1
.sessions
.validated_users
->vuid
);
153 static void increment_next_vuid(uint16_t *vuid
)
157 /* Check for vuid wrap. */
158 if (*vuid
== UID_FIELD_INVALID
) {
163 /****************************************************
164 Create a new partial auth user struct.
165 *****************************************************/
167 int register_initial_vuid(struct smbd_server_connection
*sconn
)
171 /* Paranoia check. */
172 if(lp_security() == SEC_SHARE
) {
173 smb_panic("register_initial_vuid: "
174 "Tried to register uid in security=share");
177 /* Limit allowed vuids to 16bits - VUID_OFFSET. */
178 if (sconn
->smb1
.sessions
.num_validated_vuids
>= 0xFFFF-VUID_OFFSET
) {
179 return UID_FIELD_INVALID
;
182 if((vuser
= talloc_zero(NULL
, user_struct
)) == NULL
) {
183 DEBUG(0,("register_initial_vuid: "
184 "Failed to talloc users struct!\n"));
185 return UID_FIELD_INVALID
;
188 /* Allocate a free vuid. Yes this is a linear search... */
189 while( get_valid_user_struct_internal(sconn
,
190 sconn
->smb1
.sessions
.next_vuid
,
191 SERVER_ALLOCATED_REQUIRED_ANY
) != NULL
) {
192 increment_next_vuid(&sconn
->smb1
.sessions
.next_vuid
);
195 DEBUG(10,("register_initial_vuid: allocated vuid = %u\n",
196 (unsigned int)sconn
->smb1
.sessions
.next_vuid
));
198 vuser
->vuid
= sconn
->smb1
.sessions
.next_vuid
;
201 * This happens in an unfinished NTLMSSP session setup. We
202 * need to allocate a vuid between the first and second calls
205 increment_next_vuid(&sconn
->smb1
.sessions
.next_vuid
);
206 sconn
->smb1
.sessions
.num_validated_vuids
++;
208 DLIST_ADD(sconn
->smb1
.sessions
.validated_users
, vuser
);
212 int register_homes_share(const char *username
)
217 result
= lp_servicenumber(username
);
219 DEBUG(3, ("Using static (or previously created) service for "
220 "user '%s'; path = '%s'\n", username
,
221 lp_pathname(result
)));
225 pwd
= getpwnam_alloc(talloc_tos(), username
);
227 if ((pwd
== NULL
) || (pwd
->pw_dir
[0] == '\0')) {
228 DEBUG(3, ("No home directory defined for user '%s'\n",
234 DEBUG(3, ("Adding homes service for user '%s' using home directory: "
235 "'%s'\n", username
, pwd
->pw_dir
));
237 result
= add_home_service(username
, username
, pwd
->pw_dir
);
244 * register that a valid login has been performed, establish 'session'.
245 * @param server_info The token returned from the authentication process.
246 * (now 'owned' by register_existing_vuid)
248 * @param session_key The User session key for the login session (now also
249 * 'owned' by register_existing_vuid)
251 * @param respose_blob The NT challenge-response, if available. (May be
252 * freed after this call)
254 * @param smb_name The untranslated name of the user
256 * @return Newly allocated vuid, biased by an offset. (This allows us to
257 * tell random client vuid's (normally zero) from valid vuids.)
261 int register_existing_vuid(struct smbd_server_connection
*sconn
,
263 struct auth_serversupplied_info
*server_info
,
264 DATA_BLOB response_blob
,
265 const char *smb_name
)
270 vuser
= get_partial_auth_user_struct(sconn
, vuid
);
275 /* Use this to keep tabs on all our info from the authentication */
276 vuser
->server_info
= talloc_move(vuser
, &server_info
);
278 /* This is a potentially untrusted username */
279 alpha_strcpy(tmp
, smb_name
, ". _-$", sizeof(tmp
));
281 vuser
->server_info
->sanitized_username
= talloc_strdup(
282 vuser
->server_info
, tmp
);
284 DEBUG(10,("register_existing_vuid: (%u,%u) %s %s %s guest=%d\n",
285 (unsigned int)vuser
->server_info
->utok
.uid
,
286 (unsigned int)vuser
->server_info
->utok
.gid
,
287 vuser
->server_info
->unix_name
,
288 vuser
->server_info
->sanitized_username
,
289 vuser
->server_info
->info3
->base
.domain
.string
,
290 vuser
->server_info
->guest
));
292 DEBUG(3, ("register_existing_vuid: User name: %s\t"
293 "Real name: %s\n", vuser
->server_info
->unix_name
,
294 vuser
->server_info
->info3
->base
.full_name
.string
));
296 if (!vuser
->server_info
->ptok
) {
297 DEBUG(1, ("register_existing_vuid: server_info does not "
298 "contain a user_token - cannot continue\n"));
302 DEBUG(3,("register_existing_vuid: UNIX uid %d is UNIX user %s, "
303 "and will be vuid %u\n", (int)vuser
->server_info
->utok
.uid
,
304 vuser
->server_info
->unix_name
, vuser
->vuid
));
306 if (!session_claim(sconn
, vuser
)) {
307 DEBUG(1, ("register_existing_vuid: Failed to claim session "
313 /* Register a home dir service for this user if
314 (a) This is not a guest connection,
315 (b) we have a home directory defined
316 (c) there s not an existing static share by that name
317 If a share exists by this name (autoloaded or not) reuse it . */
319 vuser
->homes_snum
= -1;
321 if (!vuser
->server_info
->guest
) {
322 vuser
->homes_snum
= register_homes_share(
323 vuser
->server_info
->unix_name
);
326 if (srv_is_signing_negotiated(sconn
) &&
327 !vuser
->server_info
->guest
) {
328 /* Try and turn on server signing on the first non-guest
330 srv_set_signing(sconn
,
331 vuser
->server_info
->user_session_key
,
335 /* fill in the current_user_info struct */
336 set_current_user_info(
337 vuser
->server_info
->sanitized_username
,
338 vuser
->server_info
->unix_name
,
339 vuser
->server_info
->info3
->base
.domain
.string
);
346 invalidate_vuid(sconn
, vuid
);
348 return UID_FIELD_INVALID
;
351 /****************************************************************************
352 Add a name to the session users list.
353 ****************************************************************************/
355 void add_session_user(struct smbd_server_connection
*sconn
,
361 pw
= Get_Pwnam_alloc(talloc_tos(), user
);
367 if (sconn
->smb1
.sessions
.session_userlist
== NULL
) {
368 sconn
->smb1
.sessions
.session_userlist
= SMB_STRDUP(pw
->pw_name
);
372 if (in_list(pw
->pw_name
,sconn
->smb1
.sessions
.session_userlist
,false)) {
376 if (strlen(sconn
->smb1
.sessions
.session_userlist
) > 128 * 1024) {
377 DEBUG(3,("add_session_user: session userlist already "
382 if (asprintf(&tmp
, "%s %s",
383 sconn
->smb1
.sessions
.session_userlist
, pw
->pw_name
) == -1) {
384 DEBUG(3, ("asprintf failed\n"));
388 SAFE_FREE(sconn
->smb1
.sessions
.session_userlist
);
389 sconn
->smb1
.sessions
.session_userlist
= tmp
;
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(struct smbd_server_connection
*sconn
,
400 const char *workgroup
)
402 if (sconn
->smb1
.sessions
.session_workgroup
) {
403 SAFE_FREE(sconn
->smb1
.sessions
.session_workgroup
);
405 sconn
->smb1
.sessions
.session_workgroup
= smb_xstrdup(workgroup
);
408 /****************************************************************************
409 In security=share mode we need to return the client workgroup, as that's
410 what Vista uses for the NTLMv2 calculation.
411 ****************************************************************************/
413 const char *get_session_workgroup(struct smbd_server_connection
*sconn
)
415 return sconn
->smb1
.sessions
.session_workgroup
;
418 /****************************************************************************
419 Check if a username is valid.
420 ****************************************************************************/
422 static bool user_ok(const char *user
, int snum
)
428 if (lp_invalid_users(snum
)) {
429 char **invalid
= str_list_copy(talloc_tos(),
430 lp_invalid_users(snum
));
432 str_list_substitute(invalid
, "%S", lp_servicename(snum
))) {
434 /* This is used in sec=share only, so no current user
435 * around to pass to str_list_sub_basic() */
437 if ( invalid
&& str_list_sub_basic(invalid
, "", "") ) {
438 ret
= !user_in_list(user
,
439 (const char **)invalid
);
442 TALLOC_FREE(invalid
);
445 if (ret
&& lp_valid_users(snum
)) {
446 char **valid
= str_list_copy(talloc_tos(),
447 lp_valid_users(snum
));
449 str_list_substitute(valid
, "%S", lp_servicename(snum
)) ) {
451 /* This is used in sec=share only, so no current user
452 * around to pass to str_list_sub_basic() */
454 if ( valid
&& str_list_sub_basic(valid
, "", "") ) {
455 ret
= user_in_list(user
,
456 (const char **)valid
);
462 if (ret
&& lp_onlyuser(snum
)) {
463 char **user_list
= str_list_make_v3(
464 talloc_tos(), lp_username(snum
), NULL
);
466 str_list_substitute(user_list
, "%S",
467 lp_servicename(snum
))) {
468 ret
= user_in_list(user
,
469 (const char **)user_list
);
471 TALLOC_FREE(user_list
);
477 /****************************************************************************
478 Validate a group username entry. Return the username or NULL.
479 ****************************************************************************/
481 static char *validate_group(struct smbd_server_connection
*sconn
,
482 char *group
, DATA_BLOB password
,int snum
)
486 char *host
, *user
, *domain
;
487 struct auth_context
*actx
= sconn
->smb1
.negprot
.auth_context
;
488 bool enc
= sconn
->smb1
.negprot
.encrypted_passwords
;
490 while (getnetgrent(&host
, &user
, &domain
)) {
492 if (user_ok(user
, snum
) &&
493 password_ok(actx
, enc
,
494 get_session_workgroup(sconn
),
508 struct auth_context
*actx
= sconn
->smb1
.negprot
.auth_context
;
509 bool enc
= sconn
->smb1
.negprot
.encrypted_passwords
;
512 while ((gptr
= (struct group
*)getgrent())) {
513 if (strequal(gptr
->gr_name
,group
))
518 * As user_ok can recurse doing a getgrent(), we must
519 * copy the member list onto the heap before
520 * use. Bug pointed out by leon@eatworms.swmed.edu.
524 char *member_list
= NULL
;
529 for(i
= 0; gptr
->gr_mem
&& gptr
->gr_mem
[i
]; i
++) {
530 list_len
+= strlen(gptr
->gr_mem
[i
])+1;
534 member_list
= (char *)SMB_MALLOC(list_len
);
541 member
= member_list
;
543 for(i
= 0; gptr
->gr_mem
&& gptr
->gr_mem
[i
]; i
++) {
544 size_t member_len
= strlen(gptr
->gr_mem
[i
])+1;
546 DEBUG(10,("validate_group: = gr_mem = "
547 "%s\n", gptr
->gr_mem
[i
]));
549 safe_strcpy(member
, gptr
->gr_mem
[i
],
550 list_len
- (member
-member_list
));
551 member
+= member_len
;
556 member
= member_list
;
558 if (user_ok(member
,snum
) &&
559 password_ok(actx
, enc
,
560 get_session_workgroup(sconn
),
562 char *name
= talloc_strdup(talloc_tos(),
564 SAFE_FREE(member_list
);
568 DEBUG(10,("validate_group = member = %s\n",
571 member
+= strlen(member
) + 1;
574 SAFE_FREE(member_list
);
584 /****************************************************************************
585 Check for authority to login to a service with a given username/password.
586 Note this is *NOT* used when logging on using sessionsetup_and_X.
587 ****************************************************************************/
589 bool authorise_login(struct smbd_server_connection
*sconn
,
590 int snum
, fstring user
, DATA_BLOB password
,
594 struct auth_context
*actx
= sconn
->smb1
.negprot
.auth_context
;
595 bool enc
= sconn
->smb1
.negprot
.encrypted_passwords
;
597 #ifdef DEBUG_PASSWORD
598 DEBUG(100,("authorise_login: checking authorisation on "
599 "user=%s pass=%s\n", user
,password
.data
));
604 /* there are several possibilities:
605 1) login as the given user with given password
606 2) login as a previously registered username with the given
608 3) login as a session list username with the given password
609 4) login as a previously validated user/password pair
610 5) login as the "user =" user with given password
611 6) login as the "user =" user with no password
613 7) login as guest user with no password
615 if the service is guest_only then steps 1 to 5 are skipped
618 /* now check the list of session users */
621 char *user_list
= NULL
;
624 if (sconn
->smb1
.sessions
.session_userlist
)
625 user_list
= SMB_STRDUP(sconn
->smb1
.sessions
.session_userlist
);
627 user_list
= SMB_STRDUP("");
632 for (auser
= strtok_r(user_list
, LIST_SEP
, &saveptr
);
634 auser
= strtok_r(NULL
, LIST_SEP
, &saveptr
)) {
636 fstrcpy(user2
,auser
);
637 if (!user_ok(user2
,snum
))
640 if (password_ok(actx
, enc
,
641 get_session_workgroup(sconn
),
645 DEBUG(3,("authorise_login: ACCEPTED: session "
646 "list username (%s) and given "
647 "password ok\n", user
));
651 SAFE_FREE(user_list
);
654 /* check the user= fields and the given password */
655 if (!ok
&& lp_username(snum
)) {
656 TALLOC_CTX
*ctx
= talloc_tos();
658 char *user_list
= talloc_strdup(ctx
, lp_username(snum
));
665 user_list
= talloc_string_sub(ctx
,
668 lp_servicename(snum
));
674 for (auser
= strtok_r(user_list
, LIST_SEP
, &saveptr
);
676 auser
= strtok_r(NULL
, LIST_SEP
, &saveptr
)) {
678 auser
= validate_group(sconn
,auser
+1,
683 DEBUG(3,("authorise_login: ACCEPTED: "
684 "group username and given "
685 "password ok (%s)\n", user
));
689 fstrcpy(user2
,auser
);
690 if (user_ok(user2
,snum
) &&
691 password_ok(actx
, enc
,
692 get_session_workgroup(sconn
),
696 DEBUG(3,("authorise_login: ACCEPTED: "
697 "user list username and "
698 "given password ok (%s)\n",
707 /* check for a normal guest connection */
708 if (!ok
&& GUEST_OK(snum
)) {
709 struct passwd
*guest_pw
;
711 fstrcpy(guestname
,lp_guestaccount());
712 guest_pw
= Get_Pwnam_alloc(talloc_tos(), guestname
);
713 if (guest_pw
!= NULL
) {
714 fstrcpy(user
,guestname
);
716 DEBUG(3,("authorise_login: ACCEPTED: guest account "
717 "and guest ok (%s)\n", user
));
719 DEBUG(0,("authorise_login: Invalid guest account "
720 "%s??\n",guestname
));
722 TALLOC_FREE(guest_pw
);
726 if (ok
&& !user_ok(user
, snum
)) {
727 DEBUG(0,("authorise_login: rejected invalid user %s\n",user
));