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 /****************************************************************************
33 Check if a uid has been validated, and return an pointer to the user_struct
34 if it has. NULL if not. vuid is biased by an offset. This allows us to
35 tell random client vuid's (normally zero) from valid vuids.
36 ****************************************************************************/
38 user_struct *get_valid_user_struct(uint16 vuid)
43 if (vuid == UID_FIELD_INVALID)
46 for (usp=validated_users;usp;usp=usp->next,count++) {
47 if (vuid == usp->vuid && usp->server_info) {
49 DLIST_PROMOTE(validated_users, usp);
58 /****************************************************************************
59 Get the user struct of a partial NTLMSSP login
60 ****************************************************************************/
62 user_struct *get_partial_auth_user_struct(uint16 vuid)
67 if (vuid == UID_FIELD_INVALID)
70 for (usp=validated_users;usp;usp=usp->next,count++) {
71 if (vuid == usp->vuid && !usp->server_info) {
73 DLIST_PROMOTE(validated_users, usp);
82 /****************************************************************************
84 ****************************************************************************/
86 void invalidate_vuid(uint16 vuid)
88 user_struct *vuser = get_valid_user_struct(vuid);
93 SAFE_FREE(vuser->homedir);
94 SAFE_FREE(vuser->unix_homedir);
95 SAFE_FREE(vuser->logon_script);
98 SAFE_FREE(vuser->session_keystr);
100 TALLOC_FREE(vuser->server_info);
102 data_blob_free(&vuser->session_key);
104 DLIST_REMOVE(validated_users, vuser);
106 /* clear the vuid from the 'cache' on each connection, and
107 from the vuid 'owner' of connections */
108 conn_clear_vuid_cache(vuid);
110 SAFE_FREE(vuser->groups);
111 TALLOC_FREE(vuser->nt_user_token);
113 num_validated_vuids--;
116 /****************************************************************************
117 Invalidate all vuid entries for this process.
118 ****************************************************************************/
120 void invalidate_all_vuids(void)
122 user_struct *usp, *next=NULL;
124 for (usp=validated_users;usp;usp=next) {
127 invalidate_vuid(usp->vuid);
132 * register that a valid login has been performed, establish 'session'.
133 * @param server_info The token returned from the authentication process.
134 * (now 'owned' by register_vuid)
136 * @param session_key The User session key for the login session (now also
137 * 'owned' by register_vuid)
139 * @param respose_blob The NT challenge-response, if available. (May be
140 * freed after this call)
142 * @param smb_name The untranslated name of the user
144 * @return Newly allocated vuid, biased by an offset. (This allows us to
145 * tell random client vuid's (normally zero) from valid vuids.)
149 int register_vuid(auth_serversupplied_info *server_info,
150 DATA_BLOB session_key, DATA_BLOB response_blob,
151 const char *smb_name)
153 user_struct *vuser = NULL;
155 /* Paranoia check. */
156 if(lp_security() == SEC_SHARE) {
157 smb_panic("Tried to register uid in security=share\n");
160 /* Limit allowed vuids to 16bits - VUID_OFFSET. */
161 if (num_validated_vuids >= 0xFFFF-VUID_OFFSET) {
162 data_blob_free(&session_key);
163 return UID_FIELD_INVALID;
166 if((vuser = SMB_MALLOC_P(user_struct)) == NULL) {
167 DEBUG(0,("Failed to malloc users struct!\n"));
168 data_blob_free(&session_key);
169 return UID_FIELD_INVALID;
174 /* Allocate a free vuid. Yes this is a linear search... :-) */
175 while( get_valid_user_struct(next_vuid) != NULL ) {
177 /* Check for vuid wrap. */
178 if (next_vuid == UID_FIELD_INVALID)
179 next_vuid = VUID_OFFSET;
182 DEBUG(10,("register_vuid: allocated vuid = %u\n",
183 (unsigned int)next_vuid ));
185 vuser->vuid = next_vuid;
189 * This happens in an unfinished NTLMSSP session setup. We
190 * need to allocate a vuid between the first and second calls
194 num_validated_vuids++;
196 vuser->server_info = NULL;
198 DLIST_ADD(validated_users, vuser);
203 /* the next functions should be done by a SID mapping system (SMS) as
204 * the new real sam db won't have reference to unix uids or gids
207 vuser->uid = server_info->uid;
208 vuser->gid = server_info->gid;
210 vuser->n_groups = server_info->n_groups;
211 if (vuser->n_groups) {
212 if (!(vuser->groups = (gid_t *)memdup(server_info->groups,
215 DEBUG(0,("register_vuid: failed to memdup "
217 data_blob_free(&session_key);
219 TALLOC_FREE(server_info);
220 return UID_FIELD_INVALID;
224 vuser->guest = server_info->guest;
225 fstrcpy(vuser->user.unix_name, server_info->unix_name);
227 /* This is a potentially untrusted username */
228 alpha_strcpy(vuser->user.smb_name, smb_name, ". _-$",
229 sizeof(vuser->user.smb_name));
231 fstrcpy(vuser->user.domain, pdb_get_domain(server_info->sam_account));
232 fstrcpy(vuser->user.full_name,
233 pdb_get_fullname(server_info->sam_account));
236 /* Keep the homedir handy */
237 const char *homedir =
238 pdb_get_homedir(server_info->sam_account);
239 const char *logon_script =
240 pdb_get_logon_script(server_info->sam_account);
242 if (!IS_SAM_DEFAULT(server_info->sam_account,
244 const char *unix_homedir =
245 pdb_get_unix_homedir(server_info->sam_account);
247 vuser->unix_homedir =
248 smb_xstrdup(unix_homedir);
251 struct passwd *passwd =
252 getpwnam_alloc(NULL, vuser->user.unix_name);
254 vuser->unix_homedir =
255 smb_xstrdup(passwd->pw_dir);
261 vuser->homedir = smb_xstrdup(homedir);
264 vuser->logon_script = smb_xstrdup(logon_script);
268 vuser->session_key = session_key;
270 DEBUG(10,("register_vuid: (%u,%u) %s %s %s guest=%d\n",
271 (unsigned int)vuser->uid,
272 (unsigned int)vuser->gid,
273 vuser->user.unix_name, vuser->user.smb_name,
274 vuser->user.domain, vuser->guest ));
276 DEBUG(3, ("User name: %s\tReal name: %s\n", vuser->user.unix_name,
277 vuser->user.full_name));
279 if (server_info->ptok) {
280 vuser->nt_user_token = dup_nt_token(NULL, server_info->ptok);
282 DEBUG(1, ("server_info does not contain a user_token - "
283 "cannot continue\n"));
284 TALLOC_FREE(server_info);
285 data_blob_free(&session_key);
286 SAFE_FREE(vuser->homedir);
287 SAFE_FREE(vuser->unix_homedir);
288 SAFE_FREE(vuser->logon_script);
291 return UID_FIELD_INVALID;
294 /* use this to keep tabs on all our info from the authentication */
295 vuser->server_info = server_info;
297 DEBUG(3,("UNIX uid %d is UNIX user %s, and will be vuid %u\n",
298 (int)vuser->uid,vuser->user.unix_name, vuser->vuid));
301 num_validated_vuids++;
303 DLIST_ADD(validated_users, vuser);
305 if (!session_claim(vuser)) {
306 DEBUG(1, ("Failed to claim session for vuid=%d\n",
308 invalidate_vuid(vuser->vuid);
309 return UID_FIELD_INVALID;
312 /* Register a home dir service for this user iff
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
318 If a share exists by this name (autoloaded or not) reuse it . */
320 vuser->homes_snum = -1;
322 if ( (!vuser->guest) && vuser->unix_homedir && *(vuser->unix_homedir))
324 int servicenumber = lp_servicenumber(vuser->user.unix_name);
326 if ( servicenumber == -1 ) {
327 DEBUG(3, ("Adding homes service for user '%s' using "
328 "home directory: '%s'\n",
329 vuser->user.unix_name, vuser->unix_homedir));
331 add_home_service(vuser->user.unix_name,
332 vuser->user.unix_name,
333 vuser->unix_homedir);
335 DEBUG(3, ("Using static (or previously created) "
336 "service for user '%s'; path = '%s'\n",
337 vuser->user.unix_name,
338 lp_pathname(servicenumber) ));
339 vuser->homes_snum = servicenumber;
343 if (srv_is_signing_negotiated() && !vuser->guest &&
344 !srv_signing_started()) {
345 /* Try and turn on server signing on the first non-guest
347 srv_set_signing(vuser->session_key, response_blob);
350 /* fill in the current_user_info struct */
351 set_current_user_info( &vuser->user );
357 /****************************************************************************
358 Add a name to the session users list.
359 ****************************************************************************/
361 void add_session_user(const char *user)
364 struct passwd *passwd;
366 if (!(passwd = Get_Pwnam(user)))
369 fstrcpy(suser,passwd->pw_name);
374 if( session_userlist && in_list(suser,session_userlist,False) )
377 if( !session_userlist ||
378 (strlen(suser) + strlen(session_userlist) + 2 >=
379 len_session_userlist) ) {
382 if (len_session_userlist > 128 * PSTRING_LEN) {
383 DEBUG(3,("add_session_user: session userlist already "
387 newlist = (char *)SMB_REALLOC_KEEP_OLD_ON_ERROR(
389 len_session_userlist + PSTRING_LEN );
390 if( newlist == NULL ) {
391 DEBUG(1,("Unable to resize session_userlist\n"));
394 if (!session_userlist) {
397 session_userlist = newlist;
398 len_session_userlist += PSTRING_LEN;
401 safe_strcat(session_userlist," ",len_session_userlist-1);
402 safe_strcat(session_userlist,suser,len_session_userlist-1);
405 /****************************************************************************
406 Check if a user is in a netgroup user list. If at first we don't succeed,
408 ****************************************************************************/
410 BOOL user_in_netgroup(const char *user, const char *ngname)
413 static char *mydomain = NULL;
414 fstring lowercase_user;
416 if (mydomain == NULL)
417 yp_get_default_domain(&mydomain);
419 if(mydomain == NULL) {
420 DEBUG(5,("Unable to get default yp domain, let's try without specifying it\n"));
423 DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
424 user, mydomain?mydomain:"(ANY)", ngname));
426 if (innetgr(ngname, NULL, user, mydomain)) {
427 DEBUG(5,("user_in_netgroup: Found\n"));
432 * Ok, innetgr is case sensitive. Try once more with lowercase
433 * just in case. Attempt to fix #703. JRA.
436 fstrcpy(lowercase_user, user);
437 strlower_m(lowercase_user);
439 DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
440 lowercase_user, mydomain?mydomain:"(ANY)", ngname));
442 if (innetgr(ngname, NULL, lowercase_user, mydomain)) {
443 DEBUG(5,("user_in_netgroup: Found\n"));
447 #endif /* HAVE_NETGROUP */
451 /****************************************************************************
452 Check if a user is in a user list - can check combinations of UNIX
454 ****************************************************************************/
456 BOOL user_in_list(const char *user,const char **list)
461 DEBUG(10,("user_in_list: checking user %s in list\n", user));
465 DEBUG(10,("user_in_list: checking user |%s| against |%s|\n",
469 * Check raw username.
471 if (strequal(user, *list))
475 * Now check to see if any combination
476 * of UNIX and netgroups has been specified.
481 * Old behaviour. Check netgroup list
482 * followed by UNIX list.
484 if(user_in_netgroup(user, *list +1))
486 if(user_in_group(user, *list +1))
488 } else if (**list == '+') {
490 if((*(*list +1)) == '&') {
492 * Search UNIX list followed by netgroup.
494 if(user_in_group(user, *list +2))
496 if(user_in_netgroup(user, *list +2))
502 * Just search UNIX list.
505 if(user_in_group(user, *list +1))
509 } else if (**list == '&') {
511 if(*(*list +1) == '+') {
513 * Search netgroup list followed by UNIX list.
515 if(user_in_netgroup(user, *list +2))
517 if(user_in_group(user, *list +2))
521 * Just search netgroup list.
523 if(user_in_netgroup(user, *list +1))
533 /****************************************************************************
534 Check if a username is valid.
535 ****************************************************************************/
537 static BOOL user_ok(const char *user, int snum)
539 char **valid, **invalid;
542 valid = invalid = NULL;
545 if (lp_invalid_users(snum)) {
546 str_list_copy(&invalid, lp_invalid_users(snum));
548 str_list_substitute(invalid, "%S", lp_servicename(snum))) {
550 /* This is used in sec=share only, so no current user
551 * around to pass to str_list_sub_basic() */
553 if ( invalid && str_list_sub_basic(invalid, "", "") ) {
554 ret = !user_in_list(user,
555 (const char **)invalid);
560 str_list_free (&invalid);
562 if (ret && lp_valid_users(snum)) {
563 str_list_copy(&valid, lp_valid_users(snum));
565 str_list_substitute(valid, "%S", lp_servicename(snum)) ) {
567 /* This is used in sec=share only, so no current user
568 * around to pass to str_list_sub_basic() */
570 if ( valid && str_list_sub_basic(valid, "", "") ) {
571 ret = user_in_list(user, (const char **)valid);
576 str_list_free (&valid);
578 if (ret && lp_onlyuser(snum)) {
579 char **user_list = str_list_make (lp_username(snum), NULL);
581 str_list_substitute(user_list, "%S",
582 lp_servicename(snum))) {
583 ret = user_in_list(user, (const char **)user_list);
585 if (user_list) str_list_free (&user_list);
591 /****************************************************************************
592 Validate a group username entry. Return the username or NULL.
593 ****************************************************************************/
595 static char *validate_group(char *group, DATA_BLOB password,int snum)
599 char *host, *user, *domain;
601 while (getnetgrent(&host, &user, &domain)) {
603 if (user_ok(user, snum) &&
604 password_ok(user,password)) {
618 while ((gptr = (struct group *)getgrent())) {
619 if (strequal(gptr->gr_name,group))
624 * As user_ok can recurse doing a getgrent(), we must
625 * copy the member list into a pstring on the stack before
626 * use. Bug pointed out by leon@eatworms.swmed.edu.
632 size_t copied_len = 0;
636 member = member_list;
638 for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
639 size_t member_len = strlen(gptr->gr_mem[i])+1;
640 if(copied_len+member_len < sizeof(pstring)) {
642 DEBUG(10,("validate_group: = gr_mem = "
643 "%s\n", gptr->gr_mem[i]));
645 safe_strcpy(member, gptr->gr_mem[i],
648 copied_len += member_len;
649 member += copied_len;
657 member = member_list;
660 fstrcpy(name,member);
661 if (user_ok(name,snum) &&
662 password_ok(name,password)) {
667 DEBUG(10,("validate_group = member = %s\n",
670 member += strlen(member) + 1;
681 /****************************************************************************
682 Check for authority to login to a service with a given username/password.
683 Note this is *NOT* used when logging on using sessionsetup_and_X.
684 ****************************************************************************/
686 BOOL authorise_login(int snum, fstring user, DATA_BLOB password,
691 #ifdef DEBUG_PASSWORD
692 DEBUG(100,("authorise_login: checking authorisation on "
693 "user=%s pass=%s\n", user,password.data));
698 /* there are several possibilities:
699 1) login as the given user with given password
700 2) login as a previously registered username with the given
702 3) login as a session list username with the given password
703 4) login as a previously validated user/password pair
704 5) login as the "user =" user with given password
705 6) login as the "user =" user with no password
707 7) login as guest user with no password
709 if the service is guest_only then steps 1 to 5 are skipped
712 /* now check the list of session users */
715 char *user_list = NULL;
717 if ( session_userlist )
718 user_list = SMB_STRDUP(session_userlist);
720 user_list = SMB_STRDUP("");
725 for (auser=strtok(user_list,LIST_SEP); !ok && auser;
726 auser = strtok(NULL,LIST_SEP)) {
728 fstrcpy(user2,auser);
729 if (!user_ok(user2,snum))
732 if (password_ok(user2,password)) {
735 DEBUG(3,("authorise_login: ACCEPTED: session "
736 "list username (%s) and given "
737 "password ok\n", user));
741 SAFE_FREE(user_list);
744 /* check the user= fields and the given password */
745 if (!ok && lp_username(snum)) {
748 pstrcpy(user_list,lp_username(snum));
750 pstring_sub(user_list,"%S",lp_servicename(snum));
752 for (auser=strtok(user_list,LIST_SEP); auser && !ok;
753 auser = strtok(NULL,LIST_SEP)) {
755 auser = validate_group(auser+1,password,snum);
759 DEBUG(3,("authorise_login: ACCEPTED: "
760 "group username and given "
761 "password ok (%s)\n", user));
765 fstrcpy(user2,auser);
766 if (user_ok(user2,snum) &&
767 password_ok(user2,password)) {
770 DEBUG(3,("authorise_login: ACCEPTED: "
771 "user list username and "
772 "given password ok (%s)\n",
779 /* check for a normal guest connection */
780 if (!ok && GUEST_OK(snum)) {
782 fstrcpy(guestname,lp_guestaccount());
783 if (Get_Pwnam(guestname)) {
784 fstrcpy(user,guestname);
786 DEBUG(3,("authorise_login: ACCEPTED: guest account "
787 "and guest ok (%s)\n", user));
789 DEBUG(0,("authorise_login: Invalid guest account "
790 "%s??\n",guestname));
795 if (ok && !user_ok(user, snum)) {
796 DEBUG(0,("authorise_login: rejected invalid user %s\n",user));