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 int DEBUGLEVEL;
25 extern struct in_addr ipzero;
27 /* users from session setup */
28 static pstring session_users="";
30 /* this holds info on user ids that are already validated for this VC */
31 static user_struct *validated_users;
32 static int next_vuid = VUID_OFFSET;
33 static int num_validated_vuids;
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 ****************************************************************************/
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) {
51 DLIST_PROMOTE(validated_users, usp);
60 /****************************************************************************
62 ****************************************************************************/
63 void invalidate_vuid(uint16 vuid)
65 user_struct *vuser = get_valid_user_struct(vuid);
72 DLIST_REMOVE(validated_users, vuser);
74 SAFE_FREE(vuser->groups);
75 delete_nt_token(&vuser->nt_user_token);
77 num_validated_vuids--;
80 /****************************************************************************
81 invalidate all vuid entries for this process
82 ****************************************************************************/
83 void invalidate_all_vuids(void)
85 user_struct *usp, *next=NULL;
87 for (usp=validated_users;usp;usp=next) {
90 invalidate_vuid(usp->vuid);
94 /****************************************************************************
95 return a validated username
96 ****************************************************************************/
97 char *validated_username(uint16 vuid)
99 user_struct *vuser = get_valid_user_struct(vuid);
102 return(vuser->user.unix_name);
105 /****************************************************************************
106 return a validated domain
107 ****************************************************************************/
108 char *validated_domain(uint16 vuid)
110 user_struct *vuser = get_valid_user_struct(vuid);
113 return(vuser->user.domain);
117 /****************************************************************************
118 Create the SID list for this user.
119 ****************************************************************************/
121 NT_USER_TOKEN *create_nt_token(uid_t uid, gid_t gid, int ngroups, gid_t *groups, BOOL is_guest)
123 extern DOM_SID global_sid_World;
124 extern DOM_SID global_sid_Network;
125 extern DOM_SID global_sid_Builtin_Guests;
126 extern DOM_SID global_sid_Authenticated_Users;
127 NT_USER_TOKEN *token;
133 if ((token = (NT_USER_TOKEN *)malloc( sizeof(NT_USER_TOKEN) ) ) == NULL)
138 /* We always have uid/gid plus World and Network and Authenticated Users or Guest SIDs. */
139 num_sids = 5 + ngroups;
141 if ((token->user_sids = (DOM_SID *)malloc( num_sids*sizeof(DOM_SID))) == NULL) {
146 psids = token->user_sids;
149 * Note - user SID *MUST* be first in token !
150 * se_access_check depends on this.
153 uid_to_sid( &psids[psid_ndx++], uid);
156 * Primary group SID is second in token. Convention.
159 gid_to_sid( &psids[psid_ndx++], gid);
161 /* Now add the group SIDs. */
163 for (i = 0; i < ngroups; i++) {
164 if (groups[i] != gid) {
165 gid_to_sid( &psids[psid_ndx++], groups[i]);
170 * Finally add the "standard" SIDs.
171 * The only difference between guest and "anonymous" (which we
172 * don't really support) is the addition of Authenticated_Users.
175 sid_copy( &psids[psid_ndx++], &global_sid_World);
176 sid_copy( &psids[psid_ndx++], &global_sid_Network);
179 sid_copy( &psids[psid_ndx++], &global_sid_Builtin_Guests);
181 sid_copy( &psids[psid_ndx++], &global_sid_Authenticated_Users);
183 token->num_sids = psid_ndx;
185 /* Dump list of sids in token */
187 for (i = 0; i < token->num_sids; i++) {
188 DEBUG(5, ("user token sid %s\n",
189 sid_to_string(sid_str, &token->user_sids[i])));
195 /****************************************************************************
196 register a uid/name pair as being valid and that a valid password
197 has been given. vuid is biased by an offset. This allows us to
198 tell random client vuid's (normally zero) from valid vuids.
199 ****************************************************************************/
201 int register_vuid(uid_t uid,gid_t gid, char *unix_name, char *requested_name,
202 char *domain,BOOL guest, char *full_name)
204 user_struct *vuser = NULL;
206 /* Ensure no vuid gets registered in share level security. */
207 if(lp_security() == SEC_SHARE)
208 return UID_FIELD_INVALID;
210 /* Limit allowed vuids to 16bits - VUID_OFFSET. */
211 if (num_validated_vuids >= 0xFFFF-VUID_OFFSET)
212 return UID_FIELD_INVALID;
214 if((vuser = (user_struct *)malloc( sizeof(user_struct) )) == NULL) {
215 DEBUG(0,("Failed to malloc users struct!\n"));
216 return UID_FIELD_INVALID;
221 DEBUG(10,("register_vuid: (%u,%u) %s %s %s guest=%d\n", (unsigned int)uid, (unsigned int)gid,
222 unix_name, requested_name, domain, guest ));
224 /* Allocate a free vuid. Yes this is a linear search... :-) */
225 while( get_valid_user_struct(next_vuid) != NULL ) {
227 /* Check for vuid wrap. */
228 if (next_vuid == UID_FIELD_INVALID)
229 next_vuid = VUID_OFFSET;
232 DEBUG(10,("register_vuid: allocated vuid = %u\n", (unsigned int)next_vuid ));
234 vuser->vuid = next_vuid;
237 vuser->guest = guest;
238 fstrcpy(vuser->user.unix_name,unix_name);
239 fstrcpy(vuser->user.smb_name,requested_name);
240 fstrcpy(vuser->user.domain,domain);
241 fstrcpy(vuser->user.full_name, full_name);
242 DEBUG(3, ("User name: %s\tReal name: %s\n",vuser->user.unix_name,vuser->user.full_name));
245 vuser->groups = NULL;
247 /* Find all the groups this uid is in and store them.
248 Used by become_user() */
249 initialise_groups(vuser->user.unix_name, vuser->uid, vuser->gid);
250 get_current_groups( &vuser->n_groups, &vuser->groups);
252 /* Create an NT_USER_TOKEN struct for this user. */
253 vuser->nt_user_token = create_nt_token(vuser->uid, vuser->gid, vuser->n_groups, vuser->groups, guest);
255 DEBUG(3,("uid %d registered to name %s\n",(int)vuser->uid,vuser->user.unix_name));
258 num_validated_vuids++;
260 DLIST_ADD(validated_users, vuser);
262 if (!session_claim(vuser->vuid)) {
263 DEBUG(1,("Failed to claim session for vuid=%d\n", vuser->vuid));
264 invalidate_vuid(vuser->vuid);
272 /****************************************************************************
273 add a name to the session users list
274 ****************************************************************************/
275 void add_session_user(char *user)
278 StrnCpy(suser,user,sizeof(suser)-1);
280 if (!Get_Pwnam(suser,True)) return;
282 if (suser && *suser && !in_list(suser,session_users,False))
284 if (strlen(suser) + strlen(session_users) + 2 >= sizeof(pstring))
285 DEBUG(1,("Too many session users??\n"));
288 pstrcat(session_users," ");
289 pstrcat(session_users,suser);
295 /****************************************************************************
296 check if a username is valid
297 ****************************************************************************/
298 BOOL user_ok(char *user,int snum)
300 char **valid, **invalid;
303 valid = invalid = NULL;
306 if (lp_invalid_users(snum)) {
307 lp_list_copy(&invalid, lp_invalid_users(snum));
308 if (invalid && lp_list_substitute(invalid, "%S", lp_servicename(snum))) {
309 ret = !user_in_list(user, invalid);
312 if (invalid) lp_list_free (&invalid);
314 if (ret && lp_valid_users(snum)) {
315 lp_list_copy(&valid, lp_valid_users(snum));
316 if (valid && lp_list_substitute(valid, "%S", lp_servicename(snum))) {
317 ret = user_in_list(user,valid);
320 if (valid) lp_list_free (&valid);
322 if (ret && lp_onlyuser(snum)) {
323 char **user_list = lp_list_make (lp_username(snum));
324 if (user_list && lp_list_substitute(user_list, "%S", lp_servicename(snum))) {
325 ret = user_in_list(user, user_list);
327 if (user_list) lp_list_free (&user_list);
333 /****************************************************************************
334 validate a group username entry. Return the username or NULL
335 ****************************************************************************/
336 static char *validate_group(char *group,char *password,int pwlen,int snum)
340 char *host, *user, *domain;
342 while (getnetgrent(&host, &user, &domain)) {
344 if (user_ok(user, snum) &&
345 password_ok(user,password,pwlen)) {
359 while ((gptr = (struct group *)getgrent())) {
360 if (strequal(gptr->gr_name,group))
365 * As user_ok can recurse doing a getgrent(), we must
366 * copy the member list into a pstring on the stack before
367 * use. Bug pointed out by leon@eatworms.swmed.edu.
373 size_t copied_len = 0;
377 member = member_list;
379 for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
380 size_t member_len = strlen(gptr->gr_mem[i]) + 1;
381 if( copied_len + member_len < sizeof(pstring)) {
383 DEBUG(10,("validate_group: = gr_mem = %s\n", gptr->gr_mem[i]));
385 safe_strcpy(member, gptr->gr_mem[i], sizeof(pstring) - copied_len - 1);
386 copied_len += member_len;
387 member += copied_len;
395 member = member_list;
398 fstrcpy(name,member);
399 if (user_ok(name,snum) &&
400 password_ok(name,password,pwlen)) {
405 DEBUG(10,("validate_group = member = %s\n", member));
407 member += strlen(member) + 1;
418 /****************************************************************************
419 Check for authority to login to a service with a given username/password.
420 Note this is *NOT* used when logging on using sessionsetup_and_X.
421 ****************************************************************************/
423 BOOL authorise_login(int snum,char *user,char *password, int pwlen,
424 BOOL *guest,BOOL *force,uint16 vuid)
427 user_struct *vuser = get_valid_user_struct(vuid);
430 DEBUG(100,("authorise_login: checking authorisation on user=%s pass=%s\n",
436 if (GUEST_ONLY(snum))
439 if (!GUEST_ONLY(snum) && (lp_security() > SEC_SHARE)) {
442 * We should just use the given vuid from a sessionsetup_and_X.
446 DEBUG(1,("authorise_login: refusing user %s with no session setup\n",
451 if (!vuser->guest && user_ok(vuser->user.unix_name,snum)) {
452 fstrcpy(user,vuser->user.unix_name);
454 DEBUG(3,("authorise_login: ACCEPTED: validated uid ok as non-guest \
455 (user=%s)\n", user));
460 /* there are several possibilities:
461 1) login as the given user with given password
462 2) login as a previously registered username with the given password
463 3) login as a session list username with the given password
464 4) login as a previously validated user/password pair
465 5) login as the "user =" user with given password
466 6) login as the "user =" user with no password (guest connection)
467 7) login as guest user with no password
469 if the service is guest_only then steps 1 to 5 are skipped
472 if (!(GUEST_ONLY(snum) && GUEST_OK(snum))) {
473 /* check for a previously registered guest username */
474 if (!ok && (vuser != 0) && vuser->guest) {
475 if (user_ok(vuser->user.unix_name,snum) &&
476 password_ok(vuser->user.unix_name, password, pwlen)) {
477 fstrcpy(user, vuser->user.unix_name);
478 vuser->guest = False;
479 DEBUG(3,("authorise_login: ACCEPTED: given password with registered user %s\n", user));
484 /* now check the list of session users */
487 char *user_list = strdup(session_users);
491 for (auser=strtok(user_list,LIST_SEP); !ok && auser;
492 auser = strtok(NULL,LIST_SEP)) {
494 fstrcpy(user2,auser);
495 if (!user_ok(user2,snum))
498 if (password_ok(user2,password, pwlen)) {
501 DEBUG(3,("authorise_login: ACCEPTED: session list username (%s) \
502 and given password ok\n", user));
506 SAFE_FREE(user_list);
509 /* check for a previously validated username/password pair */
510 if (!ok && (lp_security() > SEC_SHARE) && (vuser != 0) && !vuser->guest &&
511 user_ok(vuser->user.unix_name,snum)) {
512 fstrcpy(user,vuser->user.unix_name);
514 DEBUG(3,("authorise_login: ACCEPTED: validated uid (%s) as non-guest\n",
519 /* check the user= fields and the given password */
520 if (!ok && lp_username(snum)) {
523 StrnCpy(user_list,lp_username(snum),sizeof(pstring));
525 pstring_sub(user_list,"%S",lp_servicename(snum));
527 for (auser=strtok(user_list,LIST_SEP); auser && !ok;
528 auser = strtok(NULL,LIST_SEP)) {
530 auser = validate_group(auser+1,password,pwlen,snum);
534 DEBUG(3,("authorise_login: ACCEPTED: group username \
535 and given password ok (%s)\n", user));
539 fstrcpy(user2,auser);
540 if (user_ok(user2,snum) && password_ok(user2,password,pwlen)) {
543 DEBUG(3,("authorise_login: ACCEPTED: user list username \
544 and given password ok (%s)\n", user));
549 } /* not guest only */
551 /* check for a normal guest connection */
552 if (!ok && GUEST_OK(snum)) {
554 StrnCpy(guestname,lp_guestaccount(snum),sizeof(guestname)-1);
555 if (Get_Pwnam(guestname,True)) {
556 fstrcpy(user,guestname);
558 DEBUG(3,("authorise_login: ACCEPTED: guest account and guest ok (%s)\n",
561 DEBUG(0,("authorise_login: Invalid guest account %s??\n",guestname));
566 if (ok && !user_ok(user,snum)) {
567 DEBUG(0,("authorise_login: rejected invalid user %s\n",user));