2 Unix SMB/Netbios implementation.
4 Password and authentication handling
5 Copyright (C) Andrew Tridgell 1992-1998
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 2 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, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 extern struct in_addr ipzero;
26 /* users from session setup */
27 static pstring session_users="";
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 ****************************************************************************/
39 user_struct *get_valid_user_struct(uint16 vuid)
44 if (vuid == UID_FIELD_INVALID)
47 for (usp=validated_users;usp;usp=usp->next,count++) {
48 if (vuid == usp->vuid) {
50 DLIST_PROMOTE(validated_users, usp);
59 /****************************************************************************
61 ****************************************************************************/
62 void invalidate_vuid(uint16 vuid)
64 user_struct *vuser = get_valid_user_struct(vuid);
71 DLIST_REMOVE(validated_users, vuser);
73 SAFE_FREE(vuser->groups);
74 delete_nt_token(&vuser->nt_user_token);
76 num_validated_vuids--;
79 /****************************************************************************
80 invalidate all vuid entries for this process
81 ****************************************************************************/
82 void invalidate_all_vuids(void)
84 user_struct *usp, *next=NULL;
86 for (usp=validated_users;usp;usp=next) {
89 invalidate_vuid(usp->vuid);
93 /****************************************************************************
94 return a validated username
95 ****************************************************************************/
96 char *validated_username(uint16 vuid)
98 user_struct *vuser = get_valid_user_struct(vuid);
101 return(vuser->user.unix_name);
104 /****************************************************************************
105 return a validated domain
106 ****************************************************************************/
107 char *validated_domain(uint16 vuid)
109 user_struct *vuser = get_valid_user_struct(vuid);
112 return(vuser->user.domain);
116 /****************************************************************************
117 Create the SID list for this user.
118 ****************************************************************************/
120 NT_USER_TOKEN *create_nt_token(uid_t uid, gid_t gid, int ngroups, gid_t *groups, BOOL is_guest, NT_USER_TOKEN *sup_tok)
122 extern DOM_SID global_sid_World;
123 extern DOM_SID global_sid_Network;
124 extern DOM_SID global_sid_Builtin_Guests;
125 extern DOM_SID global_sid_Authenticated_Users;
126 NT_USER_TOKEN *token;
132 if ((token = (NT_USER_TOKEN *)malloc( sizeof(NT_USER_TOKEN) ) ) == NULL)
137 /* We always have uid/gid plus World and Network and Authenticated Users or Guest SIDs. */
138 num_sids = 5 + ngroups;
140 if (sup_tok && sup_tok->num_sids)
141 num_sids += sup_tok->num_sids;
143 if ((token->user_sids = (DOM_SID *)malloc( num_sids*sizeof(DOM_SID))) == NULL) {
148 psids = token->user_sids;
151 * Note - user SID *MUST* be first in token !
152 * se_access_check depends on this.
155 uid_to_sid( &psids[PRIMARY_USER_SID_INDEX], uid);
159 * Primary group SID is second in token. Convention.
162 gid_to_sid( &psids[PRIMARY_GROUP_SID_INDEX], gid);
165 /* Now add the group SIDs. */
167 for (i = 0; i < ngroups; i++) {
168 if (groups[i] != gid) {
169 gid_to_sid( &psids[psid_ndx++], groups[i]);
173 /* Now add the additional SIDs from the supplimentary token. */
174 for (i = 0; i < sup_tok->num_sids; i++)
175 sid_copy( &psids[psid_ndx++], &sup_tok->user_sids[i] );
178 * Finally add the "standard" SIDs.
179 * The only difference between guest and "anonymous" (which we
180 * don't really support) is the addition of Authenticated_Users.
183 sid_copy( &psids[psid_ndx++], &global_sid_World);
184 sid_copy( &psids[psid_ndx++], &global_sid_Network);
187 sid_copy( &psids[psid_ndx++], &global_sid_Builtin_Guests);
189 sid_copy( &psids[psid_ndx++], &global_sid_Authenticated_Users);
191 token->num_sids = psid_ndx;
193 /* Dump list of sids in token */
195 for (i = 0; i < token->num_sids; i++) {
196 DEBUG(5, ("user token sid %s\n",
197 sid_to_string(sid_str, &token->user_sids[i])));
203 /****************************************************************************
204 register a uid/name pair as being valid and that a valid password
205 has been given. vuid is biased by an offset. This allows us to
206 tell random client vuid's (normally zero) from valid vuids.
207 ****************************************************************************/
209 int register_vuid(auth_serversupplied_info *server_info, char *smb_name, BOOL guest)
211 user_struct *vuser = NULL;
215 /* Ensure no vuid gets registered in share level security. */
216 if(lp_security() == SEC_SHARE)
217 return UID_FIELD_INVALID;
219 /* Limit allowed vuids to 16bits - VUID_OFFSET. */
220 if (num_validated_vuids >= 0xFFFF-VUID_OFFSET)
221 return UID_FIELD_INVALID;
223 if((vuser = (user_struct *)malloc( sizeof(user_struct) )) == NULL) {
224 DEBUG(0,("Failed to malloc users struct!\n"));
225 return UID_FIELD_INVALID;
230 puid = pdb_get_uid(server_info->sam_account);
231 pgid = pdb_get_gid(server_info->sam_account);
233 if (!puid || !pgid) {
234 DEBUG(0,("Attempted session setup with invalid user. No uid/gid in SAM_ACCOUNT\n"));
236 return UID_FIELD_INVALID;
239 /* Allocate a free vuid. Yes this is a linear search... :-) */
240 while( get_valid_user_struct(next_vuid) != NULL ) {
242 /* Check for vuid wrap. */
243 if (next_vuid == UID_FIELD_INVALID)
244 next_vuid = VUID_OFFSET;
247 DEBUG(10,("register_vuid: allocated vuid = %u\n", (unsigned int)next_vuid ));
249 vuser->vuid = next_vuid;
252 vuser->guest = guest;
253 fstrcpy(vuser->user.unix_name, pdb_get_username(server_info->sam_account));
254 fstrcpy(vuser->user.smb_name, smb_name);
255 fstrcpy(vuser->user.domain, pdb_get_domain(server_info->sam_account));
256 fstrcpy(vuser->user.full_name, pdb_get_fullname(server_info->sam_account));
258 DEBUG(10,("register_vuid: (%u,%u) %s %s %s guest=%d\n",
259 (unsigned int)vuser->uid,
260 (unsigned int)vuser->gid,
261 vuser->user.unix_name, vuser->user.smb_name, vuser->user.domain, guest ));
263 DEBUG(3, ("User name: %s\tReal name: %s\n",vuser->user.unix_name,vuser->user.full_name));
266 vuser->groups = NULL;
268 /* Find all the groups this uid is in and store them.
269 Used by change_to_user() */
270 initialise_groups(vuser->user.unix_name, vuser->uid, vuser->gid);
271 get_current_groups( &vuser->n_groups, &vuser->groups);
273 if (server_info->ptok)
274 add_supplementary_nt_login_groups(&vuser->n_groups, &vuser->groups, &server_info->ptok);
276 /* Create an NT_USER_TOKEN struct for this user. */
277 vuser->nt_user_token = create_nt_token(vuser->uid, vuser->gid, vuser->n_groups, vuser->groups, guest, server_info->ptok);
279 DEBUG(3,("uid %d registered to name %s\n",(int)vuser->uid,vuser->user.unix_name));
282 num_validated_vuids++;
284 DLIST_ADD(validated_users, vuser);
286 if (!session_claim(vuser->vuid)) {
287 DEBUG(1,("Failed to claim session for vuid=%d\n", vuser->vuid));
288 invalidate_vuid(vuser->vuid);
296 /****************************************************************************
297 add a name to the session users list
298 ****************************************************************************/
299 void add_session_user(char *user)
302 StrnCpy(suser,user,sizeof(suser)-1);
304 if (!Get_Pwnam_Modify(suser)) return;
306 if (suser && *suser && !in_list(suser,session_users,False))
308 if (strlen(suser) + strlen(session_users) + 2 >= sizeof(pstring))
309 DEBUG(1,("Too many session users??\n"));
312 pstrcat(session_users," ");
313 pstrcat(session_users,suser);
319 /****************************************************************************
320 check if a username is valid
321 ****************************************************************************/
322 BOOL user_ok(char *user,int snum)
324 char **valid, **invalid;
327 valid = invalid = NULL;
330 if (lp_invalid_users(snum)) {
331 lp_list_copy(&invalid, lp_invalid_users(snum));
332 if (invalid && lp_list_substitute(invalid, "%S", lp_servicename(snum))) {
333 ret = !user_in_list(user, invalid);
336 if (invalid) lp_list_free (&invalid);
338 if (ret && lp_valid_users(snum)) {
339 lp_list_copy(&valid, lp_valid_users(snum));
340 if (valid && lp_list_substitute(valid, "%S", lp_servicename(snum))) {
341 ret = user_in_list(user,valid);
344 if (valid) lp_list_free (&valid);
346 if (ret && lp_onlyuser(snum)) {
347 char **user_list = lp_list_make (lp_username(snum));
348 if (user_list && lp_list_substitute(user_list, "%S", lp_servicename(snum))) {
349 ret = user_in_list(user, user_list);
351 if (user_list) lp_list_free (&user_list);
357 /****************************************************************************
358 validate a group username entry. Return the username or NULL
359 ****************************************************************************/
360 static char *validate_group(char *group, DATA_BLOB password,int snum)
364 char *host, *user, *domain;
366 while (getnetgrent(&host, &user, &domain)) {
368 if (user_ok(user, snum) &&
369 password_ok(user,password)) {
383 while ((gptr = (struct group *)getgrent())) {
384 if (strequal(gptr->gr_name,group))
389 * As user_ok can recurse doing a getgrent(), we must
390 * copy the member list into a pstring on the stack before
391 * use. Bug pointed out by leon@eatworms.swmed.edu.
397 size_t copied_len = 0;
401 member = member_list;
403 for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
404 size_t member_len = strlen(gptr->gr_mem[i]) + 1;
405 if( copied_len + member_len < sizeof(pstring)) {
407 DEBUG(10,("validate_group: = gr_mem = %s\n", gptr->gr_mem[i]));
409 safe_strcpy(member, gptr->gr_mem[i], sizeof(pstring) - copied_len - 1);
410 copied_len += member_len;
411 member += copied_len;
419 member = member_list;
422 fstrcpy(name,member);
423 if (user_ok(name,snum) &&
424 password_ok(name,password)) {
429 DEBUG(10,("validate_group = member = %s\n", member));
431 member += strlen(member) + 1;
442 /****************************************************************************
443 Check for authority to login to a service with a given username/password.
444 Note this is *NOT* used when logging on using sessionsetup_and_X.
445 ****************************************************************************/
447 BOOL authorise_login(int snum,char *user, DATA_BLOB password,
448 BOOL *guest,BOOL *force,uint16 vuid)
451 user_struct *vuser = get_valid_user_struct(vuid);
454 DEBUG(100,("authorise_login: checking authorisation on user=%s pass=%s\n",
455 user,password.data));
460 if (GUEST_ONLY(snum))
463 if (!GUEST_ONLY(snum) && (lp_security() > SEC_SHARE)) {
466 * We should just use the given vuid from a sessionsetup_and_X.
470 DEBUG(1,("authorise_login: refusing user %s with no session setup\n",
475 if (!vuser->guest && user_ok(vuser->user.unix_name,snum)) {
476 fstrcpy(user,vuser->user.unix_name);
478 DEBUG(3,("authorise_login: ACCEPTED: validated uid ok as non-guest \
479 (user=%s)\n", user));
484 /* there are several possibilities:
485 1) login as the given user with given password
486 2) login as a previously registered username with the given password
487 3) login as a session list username with the given password
488 4) login as a previously validated user/password pair
489 5) login as the "user =" user with given password
490 6) login as the "user =" user with no password (guest connection)
491 7) login as guest user with no password
493 if the service is guest_only then steps 1 to 5 are skipped
496 if (!(GUEST_ONLY(snum) && GUEST_OK(snum))) {
497 /* check for a previously registered guest username */
498 if (!ok && (vuser != 0) && vuser->guest) {
499 if (user_ok(vuser->user.unix_name,snum) &&
500 password_ok(vuser->user.unix_name, password)) {
501 fstrcpy(user, vuser->user.unix_name);
502 vuser->guest = False;
503 DEBUG(3,("authorise_login: ACCEPTED: given password with registered user %s\n", user));
508 /* now check the list of session users */
511 char *user_list = strdup(session_users);
515 for (auser=strtok(user_list,LIST_SEP); !ok && auser;
516 auser = strtok(NULL,LIST_SEP)) {
518 fstrcpy(user2,auser);
519 if (!user_ok(user2,snum))
522 if (password_ok(user2,password)) {
525 DEBUG(3,("authorise_login: ACCEPTED: session list username (%s) \
526 and given password ok\n", user));
530 SAFE_FREE(user_list);
533 /* check for a previously validated username/password pair */
534 if (!ok && (lp_security() > SEC_SHARE) && (vuser != 0) && !vuser->guest &&
535 user_ok(vuser->user.unix_name,snum)) {
536 fstrcpy(user,vuser->user.unix_name);
538 DEBUG(3,("authorise_login: ACCEPTED: validated uid (%s) as non-guest\n",
543 /* check the user= fields and the given password */
544 if (!ok && lp_username(snum)) {
547 StrnCpy(user_list,lp_username(snum),sizeof(pstring));
549 pstring_sub(user_list,"%S",lp_servicename(snum));
551 for (auser=strtok(user_list,LIST_SEP); auser && !ok;
552 auser = strtok(NULL,LIST_SEP)) {
554 auser = validate_group(auser+1,password,snum);
558 DEBUG(3,("authorise_login: ACCEPTED: group username \
559 and given password ok (%s)\n", user));
563 fstrcpy(user2,auser);
564 if (user_ok(user2,snum) && password_ok(user2,password)) {
567 DEBUG(3,("authorise_login: ACCEPTED: user list username \
568 and given password ok (%s)\n", user));
573 } /* not guest only */
575 /* check for a normal guest connection */
576 if (!ok && GUEST_OK(snum)) {
578 StrnCpy(guestname,lp_guestaccount(snum),sizeof(guestname)-1);
579 if (Get_Pwnam(guestname)) {
580 fstrcpy(user,guestname);
582 DEBUG(3,("authorise_login: ACCEPTED: guest account and guest ok (%s)\n",
585 DEBUG(0,("authorise_login: Invalid guest account %s??\n",guestname));
590 if (ok && !user_ok(user,snum)) {
591 DEBUG(0,("authorise_login: rejected invalid user %s\n",user));