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 extern userdom_struct current_user_info;
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 ****************************************************************************/
41 user_struct *get_valid_user_struct(uint16 vuid)
46 if (vuid == UID_FIELD_INVALID)
49 for (usp=validated_users;usp;usp=usp->next,count++) {
50 if (vuid == usp->vuid) {
52 DLIST_PROMOTE(validated_users, usp);
61 /****************************************************************************
63 ****************************************************************************/
65 void invalidate_vuid(uint16 vuid)
67 user_struct *vuser = get_valid_user_struct(vuid);
72 SAFE_FREE(vuser->homedir);
73 SAFE_FREE(vuser->unix_homedir);
74 SAFE_FREE(vuser->logon_script);
77 SAFE_FREE(vuser->session_keystr);
79 free_server_info(&vuser->server_info);
81 data_blob_free(&vuser->session_key);
83 DLIST_REMOVE(validated_users, vuser);
85 /* clear the vuid from the 'cache' on each connection, and
86 from the vuid 'owner' of connections */
87 conn_clear_vuid_cache(vuid);
89 SAFE_FREE(vuser->groups);
90 delete_nt_token(&vuser->nt_user_token);
92 num_validated_vuids--;
95 /****************************************************************************
96 Invalidate all vuid entries for this process.
97 ****************************************************************************/
99 void invalidate_all_vuids(void)
101 user_struct *usp, *next=NULL;
103 for (usp=validated_users;usp;usp=next) {
106 invalidate_vuid(usp->vuid);
111 * register that a valid login has been performed, establish 'session'.
112 * @param server_info The token returned from the authentication process.
113 * (now 'owned' by register_vuid)
115 * @param session_key The User session key for the login session (now also 'owned' by register_vuid)
117 * @param respose_blob The NT challenge-response, if available. (May be freed after this call)
119 * @param smb_name The untranslated name of the user
121 * @return Newly allocated vuid, biased by an offset. (This allows us to
122 * tell random client vuid's (normally zero) from valid vuids.)
126 int register_vuid(auth_serversupplied_info *server_info, DATA_BLOB session_key, DATA_BLOB response_blob, const char *smb_name)
128 user_struct *vuser = NULL;
130 /* Ensure no vuid gets registered in share level security. */
131 if(lp_security() == SEC_SHARE) {
132 data_blob_free(&session_key);
133 return UID_FIELD_INVALID;
136 /* Limit allowed vuids to 16bits - VUID_OFFSET. */
137 if (num_validated_vuids >= 0xFFFF-VUID_OFFSET) {
138 data_blob_free(&session_key);
139 return UID_FIELD_INVALID;
142 if((vuser = (user_struct *)malloc( sizeof(user_struct) )) == NULL) {
143 DEBUG(0,("Failed to malloc users struct!\n"));
144 data_blob_free(&session_key);
145 return UID_FIELD_INVALID;
150 /* Allocate a free vuid. Yes this is a linear search... :-) */
151 while( get_valid_user_struct(next_vuid) != NULL ) {
153 /* Check for vuid wrap. */
154 if (next_vuid == UID_FIELD_INVALID)
155 next_vuid = VUID_OFFSET;
158 DEBUG(10,("register_vuid: allocated vuid = %u\n", (unsigned int)next_vuid ));
160 vuser->vuid = next_vuid;
162 /* the next functions should be done by a SID mapping system (SMS) as
163 * the new real sam db won't have reference to unix uids or gids
166 vuser->uid = server_info->uid;
167 vuser->gid = server_info->gid;
169 vuser->n_groups = server_info->n_groups;
170 if (vuser->n_groups) {
171 if (!(vuser->groups = memdup(server_info->groups, sizeof(gid_t) * vuser->n_groups))) {
172 DEBUG(0,("register_vuid: failed to memdup vuser->groups\n"));
173 data_blob_free(&session_key);
175 free_server_info(&server_info);
176 return UID_FIELD_INVALID;
180 vuser->guest = server_info->guest;
181 fstrcpy(vuser->user.unix_name, server_info->unix_name);
183 /* This is a potentially untrusted username */
184 alpha_strcpy(vuser->user.smb_name, smb_name, ". _-$", sizeof(vuser->user.smb_name));
186 fstrcpy(vuser->user.domain, pdb_get_domain(server_info->sam_account));
187 fstrcpy(vuser->user.full_name, pdb_get_fullname(server_info->sam_account));
190 /* Keep the homedir handy */
191 const char *homedir = pdb_get_homedir(server_info->sam_account);
192 const char *logon_script = pdb_get_logon_script(server_info->sam_account);
194 if (!IS_SAM_DEFAULT(server_info->sam_account, PDB_UNIXHOMEDIR)) {
195 const char *unix_homedir = pdb_get_unix_homedir(server_info->sam_account);
197 vuser->unix_homedir = smb_xstrdup(unix_homedir);
200 struct passwd *passwd = getpwnam_alloc(vuser->user.unix_name);
202 vuser->unix_homedir = smb_xstrdup(passwd->pw_dir);
203 passwd_free(&passwd);
208 vuser->homedir = smb_xstrdup(homedir);
211 vuser->logon_script = smb_xstrdup(logon_script);
215 vuser->session_key = session_key;
217 DEBUG(10,("register_vuid: (%u,%u) %s %s %s guest=%d\n",
218 (unsigned int)vuser->uid,
219 (unsigned int)vuser->gid,
220 vuser->user.unix_name, vuser->user.smb_name, vuser->user.domain, vuser->guest ));
222 DEBUG(3, ("User name: %s\tReal name: %s\n",vuser->user.unix_name,vuser->user.full_name));
224 if (server_info->ptok) {
225 vuser->nt_user_token = dup_nt_token(server_info->ptok);
227 DEBUG(1, ("server_info does not contain a user_token - cannot continue\n"));
228 free_server_info(&server_info);
229 data_blob_free(&session_key);
230 SAFE_FREE(vuser->homedir);
231 SAFE_FREE(vuser->unix_homedir);
232 SAFE_FREE(vuser->logon_script);
235 return UID_FIELD_INVALID;
238 /* use this to keep tabs on all our info from the authentication */
239 vuser->server_info = server_info;
241 DEBUG(3,("UNIX uid %d is UNIX user %s, and will be vuid %u\n",(int)vuser->uid,vuser->user.unix_name, vuser->vuid));
244 num_validated_vuids++;
246 DLIST_ADD(validated_users, vuser);
248 if (!session_claim(vuser)) {
249 DEBUG(1,("Failed to claim session for vuid=%d\n", vuser->vuid));
250 invalidate_vuid(vuser->vuid);
254 /* Register a home dir service for this user iff
255 (a) This is not a guest connection,
256 (b) we have a home directory defined
257 If a share exists by this name (autoloaded or not) reuse it so
258 long as the home directory is the same as the share directory. */
260 if ( (!vuser->guest) && vuser->unix_homedir && *(vuser->unix_homedir)) {
261 int servicenumber = lp_servicenumber(vuser->user.unix_name);
262 if ( servicenumber == -1 ) {
263 DEBUG(3, ("Adding homes service for user '%s' using home directory: '%s'\n",
264 vuser->user.unix_name, vuser->unix_homedir));
265 vuser->homes_snum = add_home_service(vuser->user.unix_name,
266 vuser->user.unix_name, vuser->unix_homedir);
267 } else if (strcmp(lp_pathname(servicenumber),vuser->unix_homedir) == 0) {
268 DEBUG(3, ("Reusing homes service for user '%s' using home directory: '%s'\n",
269 vuser->user.unix_name, vuser->unix_homedir));
271 vuser->homes_snum = servicenumber;
274 vuser->homes_snum = -1;
277 if (srv_is_signing_negotiated() && !vuser->guest && !srv_signing_started()) {
278 /* Try and turn on server signing on the first non-guest sessionsetup. */
279 srv_set_signing(vuser->session_key, response_blob);
282 /* fill in the current_user_info struct */
283 set_current_user_info( &vuser->user );
289 /****************************************************************************
290 Add a name to the session users list.
291 ****************************************************************************/
293 void add_session_user(const char *user)
296 struct passwd *passwd;
298 if (!(passwd = Get_Pwnam(user)))
301 fstrcpy(suser,passwd->pw_name);
306 if( session_userlist && in_list(suser,session_userlist,False) )
309 if( !session_userlist || (strlen(suser) + strlen(session_userlist) + 2 >= len_session_userlist) ) {
312 if (len_session_userlist > 128 * PSTRING_LEN) {
313 DEBUG(3,("add_session_user: session userlist already too large.\n"));
316 newlist = Realloc( session_userlist, len_session_userlist + PSTRING_LEN );
317 if( newlist == NULL ) {
318 DEBUG(1,("Unable to resize session_userlist\n"));
321 if (!session_userlist) {
324 session_userlist = newlist;
325 len_session_userlist += PSTRING_LEN;
328 safe_strcat(session_userlist," ",len_session_userlist-1);
329 safe_strcat(session_userlist,suser,len_session_userlist-1);
332 /****************************************************************************
333 Check if a username is valid.
334 ****************************************************************************/
336 BOOL user_ok(const char *user,int snum, gid_t *groups, size_t n_groups)
338 char **valid, **invalid;
341 valid = invalid = NULL;
344 if (lp_invalid_users(snum)) {
345 str_list_copy(&invalid, lp_invalid_users(snum));
346 if (invalid && str_list_substitute(invalid, "%S", lp_servicename(snum))) {
347 if ( invalid && str_list_sub_basic(invalid, current_user_info.smb_name) ) {
348 ret = !user_in_list(user, (const char **)invalid, groups, n_groups);
353 str_list_free (&invalid);
355 if (ret && lp_valid_users(snum)) {
356 str_list_copy(&valid, lp_valid_users(snum));
357 if ( valid && str_list_substitute(valid, "%S", lp_servicename(snum)) ) {
358 if ( valid && str_list_sub_basic(valid, current_user_info.smb_name) ) {
359 ret = user_in_list(user, (const char **)valid, groups, n_groups);
364 str_list_free (&valid);
366 if (ret && lp_onlyuser(snum)) {
367 char **user_list = str_list_make (lp_username(snum), NULL);
368 if (user_list && str_list_substitute(user_list, "%S", lp_servicename(snum))) {
369 ret = user_in_list(user, (const char **)user_list, groups, n_groups);
371 if (user_list) str_list_free (&user_list);
377 /****************************************************************************
378 Validate a group username entry. Return the username or NULL.
379 ****************************************************************************/
381 static char *validate_group(char *group, DATA_BLOB password,int snum)
385 char *host, *user, *domain;
387 while (getnetgrent(&host, &user, &domain)) {
389 if (user_ok(user, snum, NULL, 0) &&
390 password_ok(user,password)) {
404 while ((gptr = (struct group *)getgrent())) {
405 if (strequal(gptr->gr_name,group))
410 * As user_ok can recurse doing a getgrent(), we must
411 * copy the member list into a pstring on the stack before
412 * use. Bug pointed out by leon@eatworms.swmed.edu.
418 size_t copied_len = 0;
422 member = member_list;
424 for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
425 size_t member_len = strlen(gptr->gr_mem[i]) + 1;
426 if( copied_len + member_len < sizeof(pstring)) {
428 DEBUG(10,("validate_group: = gr_mem = %s\n", gptr->gr_mem[i]));
430 safe_strcpy(member, gptr->gr_mem[i], sizeof(pstring) - copied_len - 1);
431 copied_len += member_len;
432 member += copied_len;
440 member = member_list;
443 fstrcpy(name,member);
444 if (user_ok(name,snum, NULL, 0) &&
445 password_ok(name,password)) {
450 DEBUG(10,("validate_group = member = %s\n", member));
452 member += strlen(member) + 1;
463 /****************************************************************************
464 Check for authority to login to a service with a given username/password.
465 Note this is *NOT* used when logging on using sessionsetup_and_X.
466 ****************************************************************************/
468 BOOL authorise_login(int snum, fstring user, DATA_BLOB password,
474 DEBUG(100,("authorise_login: checking authorisation on user=%s pass=%s\n",
475 user,password.data));
480 /* there are several possibilities:
481 1) login as the given user with given password
482 2) login as a previously registered username with the given password
483 3) login as a session list username with the given password
484 4) login as a previously validated user/password pair
485 5) login as the "user =" user with given password
486 6) login as the "user =" user with no password (guest connection)
487 7) login as guest user with no password
489 if the service is guest_only then steps 1 to 5 are skipped
492 /* now check the list of session users */
495 char *user_list = NULL;
497 if ( session_userlist )
498 user_list = strdup(session_userlist);
500 user_list = strdup("");
505 for (auser=strtok(user_list,LIST_SEP); !ok && auser;
506 auser = strtok(NULL,LIST_SEP)) {
508 fstrcpy(user2,auser);
509 if (!user_ok(user2,snum, NULL, 0))
512 if (password_ok(user2,password)) {
515 DEBUG(3,("authorise_login: ACCEPTED: session list username (%s) \
516 and given password ok\n", user));
520 SAFE_FREE(user_list);
523 /* check the user= fields and the given password */
524 if (!ok && lp_username(snum)) {
527 pstrcpy(user_list,lp_username(snum));
529 pstring_sub(user_list,"%S",lp_servicename(snum));
531 for (auser=strtok(user_list,LIST_SEP); auser && !ok;
532 auser = strtok(NULL,LIST_SEP)) {
534 auser = validate_group(auser+1,password,snum);
538 DEBUG(3,("authorise_login: ACCEPTED: group username \
539 and given password ok (%s)\n", user));
543 fstrcpy(user2,auser);
544 if (user_ok(user2,snum, NULL, 0) && password_ok(user2,password)) {
547 DEBUG(3,("authorise_login: ACCEPTED: user list username \
548 and given password ok (%s)\n", user));
554 /* check for a normal guest connection */
555 if (!ok && GUEST_OK(snum)) {
557 fstrcpy(guestname,lp_guestaccount());
558 if (Get_Pwnam(guestname)) {
559 fstrcpy(user,guestname);
561 DEBUG(3,("authorise_login: ACCEPTED: guest account and guest ok (%s)\n",
564 DEBUG(0,("authorise_login: Invalid guest account %s??\n",guestname));
569 if (ok && !user_ok(user, snum, NULL, 0)) {
570 DEBUG(0,("authorise_login: rejected invalid user %s\n",user));