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 /****************************************************************************
32 check if a uid has been validated, and return an pointer to the user_struct
33 if it has. NULL if not. vuid is biased by an offset. This allows us to
34 tell random client vuid's (normally zero) from valid vuids.
35 ****************************************************************************/
36 user_struct *get_valid_user_struct(uint16 vuid)
41 if (vuid == UID_FIELD_INVALID)
44 for (usp=validated_users;usp;usp=usp->next,count++) {
45 if (vuid == usp->vuid) {
47 DLIST_PROMOTE(validated_users, usp);
56 /****************************************************************************
58 ****************************************************************************/
59 void invalidate_vuid(uint16 vuid)
61 user_struct *vuser = get_valid_user_struct(vuid);
66 SAFE_FREE(vuser->homedir);
67 SAFE_FREE(vuser->unix_homedir);
68 SAFE_FREE(vuser->logon_script);
71 SAFE_FREE(vuser->session_keystr);
73 free_server_info(&vuser->server_info);
75 DLIST_REMOVE(validated_users, vuser);
77 /* clear the vuid from the 'cache' on each connection, and
78 from the vuid 'owner' of connections */
79 conn_clear_vuid_cache(vuid);
81 SAFE_FREE(vuser->groups);
82 delete_nt_token(&vuser->nt_user_token);
84 num_validated_vuids--;
87 /****************************************************************************
88 invalidate all vuid entries for this process
89 ****************************************************************************/
90 void invalidate_all_vuids(void)
92 user_struct *usp, *next=NULL;
94 for (usp=validated_users;usp;usp=next) {
97 invalidate_vuid(usp->vuid);
102 * register that a valid login has been performed, establish 'session'.
103 * @param server_info The token returned from the authentication process.
104 * (now 'owned' by register_vuid)
106 * @return Newly allocated vuid, biased by an offset. (This allows us to
107 * tell random client vuid's (normally zero) from valid vuids.)
111 int register_vuid(auth_serversupplied_info *server_info, const char *smb_name)
113 user_struct *vuser = NULL;
115 /* Ensure no vuid gets registered in share level security. */
116 if(lp_security() == SEC_SHARE)
117 return UID_FIELD_INVALID;
119 /* Limit allowed vuids to 16bits - VUID_OFFSET. */
120 if (num_validated_vuids >= 0xFFFF-VUID_OFFSET)
121 return UID_FIELD_INVALID;
123 if((vuser = (user_struct *)malloc( sizeof(user_struct) )) == NULL) {
124 DEBUG(0,("Failed to malloc users struct!\n"));
125 return UID_FIELD_INVALID;
130 /* Allocate a free vuid. Yes this is a linear search... :-) */
131 while( get_valid_user_struct(next_vuid) != NULL ) {
133 /* Check for vuid wrap. */
134 if (next_vuid == UID_FIELD_INVALID)
135 next_vuid = VUID_OFFSET;
138 DEBUG(10,("register_vuid: allocated vuid = %u\n", (unsigned int)next_vuid ));
140 vuser->vuid = next_vuid;
142 /* the next functions should be done by a SID mapping system (SMS) as
143 * the new real sam db won't have reference to unix uids or gids
145 if (!IS_SAM_UNIX_USER(server_info->sam_account)) {
146 DEBUG(0,("Attempted session setup with invalid user. No uid/gid in SAM_ACCOUNT\n"));
148 free_server_info(&server_info);
149 return UID_FIELD_INVALID;
152 vuser->uid = pdb_get_uid(server_info->sam_account);
153 vuser->gid = pdb_get_gid(server_info->sam_account);
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, pdb_get_username(server_info->sam_account));
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 *unix_homedir = pdb_get_unix_homedir(server_info->sam_account);
178 const char *logon_script = pdb_get_logon_script(server_info->sam_account);
180 vuser->homedir = smb_xstrdup(homedir);
184 vuser->unix_homedir = smb_xstrdup(unix_homedir);
188 vuser->logon_script = smb_xstrdup(logon_script);
192 memcpy(vuser->session_key, server_info->session_key, sizeof(vuser->session_key));
194 DEBUG(10,("register_vuid: (%u,%u) %s %s %s guest=%d\n",
195 (unsigned int)vuser->uid,
196 (unsigned int)vuser->gid,
197 vuser->user.unix_name, vuser->user.smb_name, vuser->user.domain, vuser->guest ));
199 DEBUG(3, ("User name: %s\tReal name: %s\n",vuser->user.unix_name,vuser->user.full_name));
201 if (server_info->ptok) {
202 vuser->nt_user_token = dup_nt_token(server_info->ptok);
204 DEBUG(1, ("server_info does not contain a user_token - cannot continue\n"));
205 free_server_info(&server_info);
206 SAFE_FREE(vuser->homedir);
207 SAFE_FREE(vuser->unix_homedir);
208 SAFE_FREE(vuser->logon_script);
211 return UID_FIELD_INVALID;
214 /* use this to keep tabs on all our info from the authentication */
215 vuser->server_info = server_info;
217 DEBUG(3,("UNIX uid %d is UNIX user %s, and will be vuid %u\n",(int)vuser->uid,vuser->user.unix_name, vuser->vuid));
220 num_validated_vuids++;
222 DLIST_ADD(validated_users, vuser);
224 if (!session_claim(vuser)) {
225 DEBUG(1,("Failed to claim session for vuid=%d\n", vuser->vuid));
226 invalidate_vuid(vuser->vuid);
230 /* Register a home dir service for this user */
231 if ((!vuser->guest) && vuser->unix_homedir && *(vuser->unix_homedir)) {
232 DEBUG(3, ("Adding/updating homes service for user '%s' using home directory: '%s'\n",
233 vuser->user.unix_name, vuser->unix_homedir));
234 vuser->homes_snum = add_home_service(vuser->user.unix_name, vuser->user.unix_name, vuser->unix_homedir);
236 vuser->homes_snum = -1;
243 /****************************************************************************
244 add a name to the session users list
245 ****************************************************************************/
246 void add_session_user(const char *user)
249 struct passwd *passwd;
251 if (!(passwd = Get_Pwnam(user))) return;
253 fstrcpy(suser,passwd->pw_name);
255 if (suser && *suser && !in_list(suser,session_users,False))
257 if (strlen(suser) + strlen(session_users) + 2 >= sizeof(pstring))
258 DEBUG(1,("Too many session users??\n"));
261 pstrcat(session_users," ");
262 pstrcat(session_users,suser);
268 /****************************************************************************
269 check if a username is valid
270 ****************************************************************************/
271 BOOL user_ok(const char *user,int snum, gid_t *groups, size_t n_groups)
273 char **valid, **invalid;
276 valid = invalid = NULL;
279 if (lp_invalid_users(snum)) {
280 str_list_copy(&invalid, lp_invalid_users(snum));
281 if (invalid && str_list_substitute(invalid, "%S", lp_servicename(snum))) {
282 ret = !user_in_list(user, (const char **)invalid, groups, n_groups);
286 str_list_free (&invalid);
288 if (ret && lp_valid_users(snum)) {
289 str_list_copy(&valid, lp_valid_users(snum));
290 if (valid && str_list_substitute(valid, "%S", lp_servicename(snum))) {
291 ret = user_in_list(user, (const char **)valid, groups, n_groups);
295 str_list_free (&valid);
297 if (ret && lp_onlyuser(snum)) {
298 char **user_list = str_list_make (lp_username(snum), NULL);
299 if (user_list && str_list_substitute(user_list, "%S", lp_servicename(snum))) {
300 ret = user_in_list(user, (const char **)user_list, groups, n_groups);
302 if (user_list) str_list_free (&user_list);
308 /****************************************************************************
309 validate a group username entry. Return the username or NULL
310 ****************************************************************************/
311 static char *validate_group(char *group, DATA_BLOB password,int snum)
315 char *host, *user, *domain;
317 while (getnetgrent(&host, &user, &domain)) {
319 if (user_ok(user, snum, NULL, 0) &&
320 password_ok(user,password)) {
334 while ((gptr = (struct group *)getgrent())) {
335 if (strequal(gptr->gr_name,group))
340 * As user_ok can recurse doing a getgrent(), we must
341 * copy the member list into a pstring on the stack before
342 * use. Bug pointed out by leon@eatworms.swmed.edu.
348 size_t copied_len = 0;
352 member = member_list;
354 for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
355 size_t member_len = strlen(gptr->gr_mem[i]) + 1;
356 if( copied_len + member_len < sizeof(pstring)) {
358 DEBUG(10,("validate_group: = gr_mem = %s\n", gptr->gr_mem[i]));
360 safe_strcpy(member, gptr->gr_mem[i], sizeof(pstring) - copied_len - 1);
361 copied_len += member_len;
362 member += copied_len;
370 member = member_list;
373 fstrcpy(name,member);
374 if (user_ok(name,snum, NULL, 0) &&
375 password_ok(name,password)) {
380 DEBUG(10,("validate_group = member = %s\n", member));
382 member += strlen(member) + 1;
393 /****************************************************************************
394 Check for authority to login to a service with a given username/password.
395 Note this is *NOT* used when logging on using sessionsetup_and_X.
396 ****************************************************************************/
398 BOOL authorise_login(int snum, fstring user, DATA_BLOB password,
404 DEBUG(100,("authorise_login: checking authorisation on user=%s pass=%s\n",
405 user,password.data));
410 /* there are several possibilities:
411 1) login as the given user with given password
412 2) login as a previously registered username with the given password
413 3) login as a session list username with the given password
414 4) login as a previously validated user/password pair
415 5) login as the "user =" user with given password
416 6) login as the "user =" user with no password (guest connection)
417 7) login as guest user with no password
419 if the service is guest_only then steps 1 to 5 are skipped
422 /* now check the list of session users */
425 char *user_list = strdup(session_users);
429 for (auser=strtok(user_list,LIST_SEP); !ok && auser;
430 auser = strtok(NULL,LIST_SEP)) {
432 fstrcpy(user2,auser);
433 if (!user_ok(user2,snum, NULL, 0))
436 if (password_ok(user2,password)) {
439 DEBUG(3,("authorise_login: ACCEPTED: session list username (%s) \
440 and given password ok\n", user));
444 SAFE_FREE(user_list);
447 /* check the user= fields and the given password */
448 if (!ok && lp_username(snum)) {
451 pstrcpy(user_list,lp_username(snum));
453 pstring_sub(user_list,"%S",lp_servicename(snum));
455 for (auser=strtok(user_list,LIST_SEP); auser && !ok;
456 auser = strtok(NULL,LIST_SEP)) {
458 auser = validate_group(auser+1,password,snum);
462 DEBUG(3,("authorise_login: ACCEPTED: group username \
463 and given password ok (%s)\n", user));
467 fstrcpy(user2,auser);
468 if (user_ok(user2,snum, NULL, 0) && password_ok(user2,password)) {
471 DEBUG(3,("authorise_login: ACCEPTED: user list username \
472 and given password ok (%s)\n", user));
478 /* check for a normal guest connection */
479 if (!ok && GUEST_OK(snum)) {
481 fstrcpy(guestname,lp_guestaccount());
482 if (Get_Pwnam(guestname)) {
483 fstrcpy(user,guestname);
485 DEBUG(3,("authorise_login: ACCEPTED: guest account and guest ok (%s)\n",
488 DEBUG(0,("authorise_login: Invalid guest account %s??\n",guestname));
493 if (ok && !user_ok(user, snum, NULL, 0)) {
494 DEBUG(0,("authorise_login: rejected invalid user %s\n",user));