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 pstring session_users="";
26 /* this holds info on user ids that are already validated for this VC */
27 static user_struct *validated_users;
28 static int next_vuid = VUID_OFFSET;
29 static int num_validated_vuids;
31 extern userdom_struct current_user_info;
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 ****************************************************************************/
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 ****************************************************************************/
64 void invalidate_vuid(uint16 vuid)
66 user_struct *vuser = get_valid_user_struct(vuid);
71 SAFE_FREE(vuser->homedir);
72 SAFE_FREE(vuser->unix_homedir);
73 SAFE_FREE(vuser->logon_script);
76 SAFE_FREE(vuser->session_keystr);
78 free_server_info(&vuser->server_info);
80 DLIST_REMOVE(validated_users, vuser);
82 /* clear the vuid from the 'cache' on each connection, and
83 from the vuid 'owner' of connections */
84 conn_clear_vuid_cache(vuid);
86 SAFE_FREE(vuser->groups);
87 delete_nt_token(&vuser->nt_user_token);
89 num_validated_vuids--;
92 /****************************************************************************
93 Invalidate all vuid entries for this process.
94 ****************************************************************************/
96 void invalidate_all_vuids(void)
98 user_struct *usp, *next=NULL;
100 for (usp=validated_users;usp;usp=next) {
103 invalidate_vuid(usp->vuid);
108 * register that a valid login has been performed, establish 'session'.
109 * @param server_info The token returned from the authentication process.
110 * (now 'owned' by register_vuid)
112 * @return Newly allocated vuid, biased by an offset. (This allows us to
113 * tell random client vuid's (normally zero) from valid vuids.)
117 int register_vuid(auth_serversupplied_info *server_info, DATA_BLOB response_blob, const char *smb_name)
119 user_struct *vuser = NULL;
121 /* Ensure no vuid gets registered in share level security. */
122 if(lp_security() == SEC_SHARE)
123 return UID_FIELD_INVALID;
125 /* Limit allowed vuids to 16bits - VUID_OFFSET. */
126 if (num_validated_vuids >= 0xFFFF-VUID_OFFSET)
127 return UID_FIELD_INVALID;
129 if((vuser = (user_struct *)malloc( sizeof(user_struct) )) == NULL) {
130 DEBUG(0,("Failed to malloc users struct!\n"));
131 return UID_FIELD_INVALID;
136 /* Allocate a free vuid. Yes this is a linear search... :-) */
137 while( get_valid_user_struct(next_vuid) != NULL ) {
139 /* Check for vuid wrap. */
140 if (next_vuid == UID_FIELD_INVALID)
141 next_vuid = VUID_OFFSET;
144 DEBUG(10,("register_vuid: allocated vuid = %u\n", (unsigned int)next_vuid ));
146 vuser->vuid = next_vuid;
148 /* the next functions should be done by a SID mapping system (SMS) as
149 * the new real sam db won't have reference to unix uids or gids
152 vuser->uid = server_info->uid;
153 vuser->gid = server_info->gid;
155 vuser->n_groups = server_info->n_groups;
156 if (vuser->n_groups) {
157 if (!(vuser->groups = memdup(server_info->groups, sizeof(gid_t) * vuser->n_groups))) {
158 DEBUG(0,("register_vuid: failed to memdup vuser->groups\n"));
160 free_server_info(&server_info);
161 return UID_FIELD_INVALID;
165 vuser->guest = server_info->guest;
166 fstrcpy(vuser->user.unix_name, server_info->unix_name);
168 /* This is a potentially untrusted username */
169 alpha_strcpy(vuser->user.smb_name, smb_name, ". _-$", sizeof(vuser->user.smb_name));
171 fstrcpy(vuser->user.domain, pdb_get_domain(server_info->sam_account));
172 fstrcpy(vuser->user.full_name, pdb_get_fullname(server_info->sam_account));
175 /* Keep the homedir handy */
176 const char *homedir = pdb_get_homedir(server_info->sam_account);
177 const char *logon_script = pdb_get_logon_script(server_info->sam_account);
179 if (!IS_SAM_DEFAULT(server_info->sam_account, PDB_UNIXHOMEDIR)) {
180 const char *unix_homedir = pdb_get_unix_homedir(server_info->sam_account);
182 vuser->unix_homedir = smb_xstrdup(unix_homedir);
185 struct passwd *passwd = getpwnam_alloc(vuser->user.unix_name);
187 vuser->unix_homedir = smb_xstrdup(passwd->pw_dir);
188 passwd_free(&passwd);
193 vuser->homedir = smb_xstrdup(homedir);
196 vuser->logon_script = smb_xstrdup(logon_script);
200 memcpy(vuser->session_key, server_info->session_key, sizeof(vuser->session_key));
202 DEBUG(10,("register_vuid: (%u,%u) %s %s %s guest=%d\n",
203 (unsigned int)vuser->uid,
204 (unsigned int)vuser->gid,
205 vuser->user.unix_name, vuser->user.smb_name, vuser->user.domain, vuser->guest ));
207 DEBUG(3, ("User name: %s\tReal name: %s\n",vuser->user.unix_name,vuser->user.full_name));
209 if (server_info->ptok) {
210 vuser->nt_user_token = dup_nt_token(server_info->ptok);
212 DEBUG(1, ("server_info does not contain a user_token - cannot continue\n"));
213 free_server_info(&server_info);
214 SAFE_FREE(vuser->homedir);
215 SAFE_FREE(vuser->unix_homedir);
216 SAFE_FREE(vuser->logon_script);
219 return UID_FIELD_INVALID;
222 /* use this to keep tabs on all our info from the authentication */
223 vuser->server_info = server_info;
225 DEBUG(3,("UNIX uid %d is UNIX user %s, and will be vuid %u\n",(int)vuser->uid,vuser->user.unix_name, vuser->vuid));
228 num_validated_vuids++;
230 DLIST_ADD(validated_users, vuser);
232 if (!session_claim(vuser)) {
233 DEBUG(1,("Failed to claim session for vuid=%d\n", vuser->vuid));
234 invalidate_vuid(vuser->vuid);
238 /* Register a home dir service for this user */
239 if ((!vuser->guest) && vuser->unix_homedir && *(vuser->unix_homedir)) {
240 DEBUG(3, ("Adding/updating homes service for user '%s' using home directory: '%s'\n",
241 vuser->user.unix_name, vuser->unix_homedir));
242 vuser->homes_snum = add_home_service(vuser->user.unix_name, vuser->user.unix_name, vuser->unix_homedir);
244 vuser->homes_snum = -1;
247 if (lp_server_signing() && !vuser->guest && !srv_is_signing_active()) {
248 /* Try and turn on server signing on the first non-guest sessionsetup. */
249 srv_set_signing(vuser->session_key, response_blob);
255 /****************************************************************************
256 Add a name to the session users list.
257 ****************************************************************************/
259 void add_session_user(const char *user)
262 struct passwd *passwd;
264 if (!(passwd = Get_Pwnam(user)))
267 fstrcpy(suser,passwd->pw_name);
269 if (suser && *suser && !in_list(suser,session_users,False)) {
270 if (strlen(suser) + strlen(session_users) + 2 >= sizeof(pstring)) {
271 DEBUG(1,("Too many session users??\n"));
273 pstrcat(session_users," ");
274 pstrcat(session_users,suser);
279 /****************************************************************************
280 Check if a username is valid.
281 ****************************************************************************/
283 BOOL user_ok(const char *user,int snum, gid_t *groups, size_t n_groups)
285 char **valid, **invalid;
288 valid = invalid = NULL;
291 if (lp_invalid_users(snum)) {
292 str_list_copy(&invalid, lp_invalid_users(snum));
293 if (invalid && str_list_substitute(invalid, "%S", lp_servicename(snum))) {
294 if ( invalid && str_list_sub_basic(invalid, current_user_info.smb_name) ) {
295 ret = !user_in_list(user, (const char **)invalid, groups, n_groups);
300 str_list_free (&invalid);
302 if (ret && lp_valid_users(snum)) {
303 str_list_copy(&valid, lp_valid_users(snum));
304 if ( valid && str_list_substitute(valid, "%S", lp_servicename(snum)) ) {
305 if ( valid && str_list_sub_basic(valid, current_user_info.smb_name) ) {
306 ret = user_in_list(user, (const char **)valid, groups, n_groups);
311 str_list_free (&valid);
313 if (ret && lp_onlyuser(snum)) {
314 char **user_list = str_list_make (lp_username(snum), NULL);
315 if (user_list && str_list_substitute(user_list, "%S", lp_servicename(snum))) {
316 ret = user_in_list(user, (const char **)user_list, groups, n_groups);
318 if (user_list) str_list_free (&user_list);
324 /****************************************************************************
325 Validate a group username entry. Return the username or NULL.
326 ****************************************************************************/
328 static char *validate_group(char *group, DATA_BLOB password,int snum)
332 char *host, *user, *domain;
334 while (getnetgrent(&host, &user, &domain)) {
336 if (user_ok(user, snum, NULL, 0) &&
337 password_ok(user,password)) {
351 while ((gptr = (struct group *)getgrent())) {
352 if (strequal(gptr->gr_name,group))
357 * As user_ok can recurse doing a getgrent(), we must
358 * copy the member list into a pstring on the stack before
359 * use. Bug pointed out by leon@eatworms.swmed.edu.
365 size_t copied_len = 0;
369 member = member_list;
371 for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
372 size_t member_len = strlen(gptr->gr_mem[i]) + 1;
373 if( copied_len + member_len < sizeof(pstring)) {
375 DEBUG(10,("validate_group: = gr_mem = %s\n", gptr->gr_mem[i]));
377 safe_strcpy(member, gptr->gr_mem[i], sizeof(pstring) - copied_len - 1);
378 copied_len += member_len;
379 member += copied_len;
387 member = member_list;
390 fstrcpy(name,member);
391 if (user_ok(name,snum, NULL, 0) &&
392 password_ok(name,password)) {
397 DEBUG(10,("validate_group = member = %s\n", member));
399 member += strlen(member) + 1;
410 /****************************************************************************
411 Check for authority to login to a service with a given username/password.
412 Note this is *NOT* used when logging on using sessionsetup_and_X.
413 ****************************************************************************/
415 BOOL authorise_login(int snum, fstring user, DATA_BLOB password,
421 DEBUG(100,("authorise_login: checking authorisation on user=%s pass=%s\n",
422 user,password.data));
427 /* there are several possibilities:
428 1) login as the given user with given password
429 2) login as a previously registered username with the given password
430 3) login as a session list username with the given password
431 4) login as a previously validated user/password pair
432 5) login as the "user =" user with given password
433 6) login as the "user =" user with no password (guest connection)
434 7) login as guest user with no password
436 if the service is guest_only then steps 1 to 5 are skipped
439 /* now check the list of session users */
442 char *user_list = strdup(session_users);
446 for (auser=strtok(user_list,LIST_SEP); !ok && auser;
447 auser = strtok(NULL,LIST_SEP)) {
449 fstrcpy(user2,auser);
450 if (!user_ok(user2,snum, NULL, 0))
453 if (password_ok(user2,password)) {
456 DEBUG(3,("authorise_login: ACCEPTED: session list username (%s) \
457 and given password ok\n", user));
461 SAFE_FREE(user_list);
464 /* check the user= fields and the given password */
465 if (!ok && lp_username(snum)) {
468 pstrcpy(user_list,lp_username(snum));
470 pstring_sub(user_list,"%S",lp_servicename(snum));
472 for (auser=strtok(user_list,LIST_SEP); auser && !ok;
473 auser = strtok(NULL,LIST_SEP)) {
475 auser = validate_group(auser+1,password,snum);
479 DEBUG(3,("authorise_login: ACCEPTED: group username \
480 and given password ok (%s)\n", user));
484 fstrcpy(user2,auser);
485 if (user_ok(user2,snum, NULL, 0) && password_ok(user2,password)) {
488 DEBUG(3,("authorise_login: ACCEPTED: user list username \
489 and given password ok (%s)\n", user));
495 /* check for a normal guest connection */
496 if (!ok && GUEST_OK(snum)) {
498 fstrcpy(guestname,lp_guestaccount());
499 if (Get_Pwnam(guestname)) {
500 fstrcpy(user,guestname);
502 DEBUG(3,("authorise_login: ACCEPTED: guest account and guest ok (%s)\n",
505 DEBUG(0,("authorise_login: Invalid guest account %s??\n",guestname));
510 if (ok && !user_ok(user, snum, NULL, 0)) {
511 DEBUG(0,("authorise_login: rejected invalid user %s\n",user));