2 Unix SMB/CIFS implementation.
3 Password and authentication handling
4 Copyright (C) Andrew Tridgell 1992-1998
5 Copyright (C) Jeremy Allison 2007.
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 3 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, see <http://www.gnu.org/licenses/>.
22 #include "system/passwd.h"
23 #include "smbd/smbd.h"
24 #include "smbd/globals.h"
25 #include "../librpc/gen_ndr/netlogon.h"
27 #include "../libcli/security/security.h"
29 /* Fix up prototypes for OSX 10.4, where they're missing */
30 #ifndef HAVE_SETNETGRENT_PROTOTYPE
31 extern int setnetgrent(const char* netgroup);
33 #ifndef HAVE_GETNETGRENT_PROTOTYPE
34 extern int getnetgrent(char **host, char **user, char **domain);
36 #ifndef HAVE_ENDNETGRENT_PROTOTYPE
37 extern void endnetgrent(void);
40 enum server_allocated_state { SERVER_ALLOCATED_REQUIRED_YES,
41 SERVER_ALLOCATED_REQUIRED_NO,
42 SERVER_ALLOCATED_REQUIRED_ANY};
44 static user_struct *get_valid_user_struct_internal(
45 struct smbd_server_connection *sconn,
47 enum server_allocated_state server_allocated)
52 if (vuid == UID_FIELD_INVALID)
55 usp=sconn->smb1.sessions.validated_users;
56 for (;usp;usp=usp->next,count++) {
57 if (vuid == usp->vuid) {
58 switch (server_allocated) {
59 case SERVER_ALLOCATED_REQUIRED_YES:
60 if (usp->session_info == NULL) {
64 case SERVER_ALLOCATED_REQUIRED_NO:
65 if (usp->session_info != NULL) {
68 case SERVER_ALLOCATED_REQUIRED_ANY:
72 DLIST_PROMOTE(sconn->smb1.sessions.validated_users,
82 /****************************************************************************
83 Check if a uid has been validated, and return an pointer to the user_struct
84 if it has. NULL if not. vuid is biased by an offset. This allows us to
85 tell random client vuid's (normally zero) from valid vuids.
86 ****************************************************************************/
88 user_struct *get_valid_user_struct(struct smbd_server_connection *sconn,
91 return get_valid_user_struct_internal(sconn, vuid,
92 SERVER_ALLOCATED_REQUIRED_YES);
95 bool is_partial_auth_vuid(struct smbd_server_connection *sconn, uint16 vuid)
97 return (get_partial_auth_user_struct(sconn, vuid) != NULL);
100 /****************************************************************************
101 Get the user struct of a partial NTLMSSP login
102 ****************************************************************************/
104 user_struct *get_partial_auth_user_struct(struct smbd_server_connection *sconn,
107 return get_valid_user_struct_internal(sconn, vuid,
108 SERVER_ALLOCATED_REQUIRED_NO);
111 /****************************************************************************
113 ****************************************************************************/
115 void invalidate_vuid(struct smbd_server_connection *sconn, uint16 vuid)
117 user_struct *vuser = NULL;
119 vuser = get_valid_user_struct_internal(sconn, vuid,
120 SERVER_ALLOCATED_REQUIRED_ANY);
125 session_yield(vuser);
127 if (vuser->auth_ntlmssp_state) {
128 TALLOC_FREE(vuser->auth_ntlmssp_state);
131 DLIST_REMOVE(sconn->smb1.sessions.validated_users, vuser);
133 /* clear the vuid from the 'cache' on each connection, and
134 from the vuid 'owner' of connections */
135 conn_clear_vuid_caches(sconn, vuid);
138 sconn->smb1.sessions.num_validated_vuids--;
141 /****************************************************************************
142 Invalidate all vuid entries for this process.
143 ****************************************************************************/
145 void invalidate_all_vuids(struct smbd_server_connection *sconn)
147 if (sconn->using_smb2) {
151 while (sconn->smb1.sessions.validated_users != NULL) {
152 invalidate_vuid(sconn,
153 sconn->smb1.sessions.validated_users->vuid);
157 static void increment_next_vuid(uint16_t *vuid)
161 /* Check for vuid wrap. */
162 if (*vuid == UID_FIELD_INVALID) {
167 /****************************************************
168 Create a new partial auth user struct.
169 *****************************************************/
171 int register_initial_vuid(struct smbd_server_connection *sconn)
175 /* Paranoia check. */
176 if(lp_security() == SEC_SHARE) {
177 smb_panic("register_initial_vuid: "
178 "Tried to register uid in security=share");
181 /* Limit allowed vuids to 16bits - VUID_OFFSET. */
182 if (sconn->smb1.sessions.num_validated_vuids >= 0xFFFF-VUID_OFFSET) {
183 return UID_FIELD_INVALID;
186 if((vuser = talloc_zero(NULL, user_struct)) == NULL) {
187 DEBUG(0,("register_initial_vuid: "
188 "Failed to talloc users struct!\n"));
189 return UID_FIELD_INVALID;
192 /* Allocate a free vuid. Yes this is a linear search... */
193 while( get_valid_user_struct_internal(sconn,
194 sconn->smb1.sessions.next_vuid,
195 SERVER_ALLOCATED_REQUIRED_ANY) != NULL ) {
196 increment_next_vuid(&sconn->smb1.sessions.next_vuid);
199 DEBUG(10,("register_initial_vuid: allocated vuid = %u\n",
200 (unsigned int)sconn->smb1.sessions.next_vuid ));
202 vuser->vuid = sconn->smb1.sessions.next_vuid;
205 * This happens in an unfinished NTLMSSP session setup. We
206 * need to allocate a vuid between the first and second calls
209 increment_next_vuid(&sconn->smb1.sessions.next_vuid);
210 sconn->smb1.sessions.num_validated_vuids++;
212 DLIST_ADD(sconn->smb1.sessions.validated_users, vuser);
216 int register_homes_share(const char *username)
221 result = lp_servicenumber(username);
223 DEBUG(3, ("Using static (or previously created) service for "
224 "user '%s'; path = '%s'\n", username,
225 lp_pathname(result)));
229 pwd = Get_Pwnam_alloc(talloc_tos(), username);
231 if ((pwd == NULL) || (pwd->pw_dir[0] == '\0')) {
232 DEBUG(3, ("No home directory defined for user '%s'\n",
238 DEBUG(3, ("Adding homes service for user '%s' using home directory: "
239 "'%s'\n", username, pwd->pw_dir));
241 result = add_home_service(username, username, pwd->pw_dir);
248 * register that a valid login has been performed, establish 'session'.
249 * @param session_info The token returned from the authentication process.
250 * (now 'owned' by register_existing_vuid)
252 * @param session_key The User session key for the login session (now also
253 * 'owned' by register_existing_vuid)
255 * @param respose_blob The NT challenge-response, if available. (May be
256 * freed after this call)
258 * @param smb_name The untranslated name of the user
260 * @return Newly allocated vuid, biased by an offset. (This allows us to
261 * tell random client vuid's (normally zero) from valid vuids.)
265 int register_existing_vuid(struct smbd_server_connection *sconn,
267 struct auth_session_info *session_info,
268 DATA_BLOB response_blob,
269 const char *smb_name)
273 bool guest = security_session_user_level(session_info, NULL) < SECURITY_USER;
275 vuser = get_partial_auth_user_struct(sconn, vuid);
280 /* Use this to keep tabs on all our info from the authentication */
281 vuser->session_info = talloc_move(vuser, &session_info);
283 /* This is a potentially untrusted username */
284 alpha_strcpy(tmp, smb_name, ". _-$", sizeof(tmp));
286 vuser->session_info->unix_info->sanitized_username = talloc_strdup(
287 vuser->session_info, tmp);
289 /* Make clear that we require the optional unix_token and unix_info in the source3 code */
290 SMB_ASSERT(vuser->session_info->unix_token);
291 SMB_ASSERT(vuser->session_info->unix_info);
293 DEBUG(10,("register_existing_vuid: (%u,%u) %s %s %s guest=%d\n",
294 (unsigned int)vuser->session_info->unix_token->uid,
295 (unsigned int)vuser->session_info->unix_token->gid,
296 vuser->session_info->unix_info->unix_name,
297 vuser->session_info->unix_info->sanitized_username,
298 vuser->session_info->info->domain_name,
301 DEBUG(3, ("register_existing_vuid: User name: %s\t"
302 "Real name: %s\n", vuser->session_info->unix_info->unix_name,
303 vuser->session_info->info->full_name));
305 if (!vuser->session_info->security_token) {
306 DEBUG(1, ("register_existing_vuid: session_info does not "
307 "contain a user_token - cannot continue\n"));
311 /* Make clear that we require the optional unix_token in the source3 code */
312 SMB_ASSERT(vuser->session_info->unix_token);
314 DEBUG(3,("register_existing_vuid: UNIX uid %d is UNIX user %s, "
315 "and will be vuid %u\n", (int)vuser->session_info->unix_token->uid,
316 vuser->session_info->unix_info->unix_name, vuser->vuid));
318 if (!session_claim(sconn, vuser)) {
319 DEBUG(1, ("register_existing_vuid: Failed to claim session "
325 /* Register a home dir service for this user if
326 (a) This is not a guest connection,
327 (b) we have a home directory defined
328 (c) there s not an existing static share by that name
329 If a share exists by this name (autoloaded or not) reuse it . */
331 vuser->homes_snum = -1;
335 vuser->homes_snum = register_homes_share(
336 vuser->session_info->unix_info->unix_name);
339 if (srv_is_signing_negotiated(sconn) &&
341 /* Try and turn on server signing on the first non-guest
343 srv_set_signing(sconn,
344 vuser->session_info->session_key,
348 /* fill in the current_user_info struct */
349 set_current_user_info(
350 vuser->session_info->unix_info->sanitized_username,
351 vuser->session_info->unix_info->unix_name,
352 vuser->session_info->info->domain_name);
359 invalidate_vuid(sconn, vuid);
361 return UID_FIELD_INVALID;
364 /****************************************************************************
365 Add a name to the session users list.
366 ****************************************************************************/
368 void add_session_user(struct smbd_server_connection *sconn,
374 pw = Get_Pwnam_alloc(talloc_tos(), user);
380 if (sconn->smb1.sessions.session_userlist == NULL) {
381 sconn->smb1.sessions.session_userlist = SMB_STRDUP(pw->pw_name);
385 if (in_list(pw->pw_name,sconn->smb1.sessions.session_userlist,false)) {
389 if (strlen(sconn->smb1.sessions.session_userlist) > 128 * 1024) {
390 DEBUG(3,("add_session_user: session userlist already "
395 if (asprintf(&tmp, "%s %s",
396 sconn->smb1.sessions.session_userlist, pw->pw_name) == -1) {
397 DEBUG(3, ("asprintf failed\n"));
401 SAFE_FREE(sconn->smb1.sessions.session_userlist);
402 sconn->smb1.sessions.session_userlist = tmp;
407 /****************************************************************************
408 In security=share mode we need to store the client workgroup, as that's
409 what Vista uses for the NTLMv2 calculation.
410 ****************************************************************************/
412 void add_session_workgroup(struct smbd_server_connection *sconn,
413 const char *workgroup)
415 if (sconn->smb1.sessions.session_workgroup) {
416 SAFE_FREE(sconn->smb1.sessions.session_workgroup);
418 sconn->smb1.sessions.session_workgroup = smb_xstrdup(workgroup);
421 /****************************************************************************
422 In security=share mode we need to return the client workgroup, as that's
423 what Vista uses for the NTLMv2 calculation.
424 ****************************************************************************/
426 const char *get_session_workgroup(struct smbd_server_connection *sconn)
428 return sconn->smb1.sessions.session_workgroup;
431 /****************************************************************************
432 Check if a username is valid.
433 ****************************************************************************/
435 static bool user_ok(const char *user, int snum)
441 if (lp_invalid_users(snum)) {
442 char **invalid = str_list_copy(talloc_tos(),
443 lp_invalid_users(snum));
445 str_list_substitute(invalid, "%S", lp_servicename(snum))) {
447 /* This is used in sec=share only, so no current user
448 * around to pass to str_list_sub_basic() */
450 if ( invalid && str_list_sub_basic(invalid, "", "") ) {
451 ret = !user_in_list(talloc_tos(), user,
452 (const char **)invalid);
455 TALLOC_FREE(invalid);
458 if (ret && lp_valid_users(snum)) {
459 char **valid = str_list_copy(talloc_tos(),
460 lp_valid_users(snum));
462 str_list_substitute(valid, "%S", lp_servicename(snum)) ) {
464 /* This is used in sec=share only, so no current user
465 * around to pass to str_list_sub_basic() */
467 if ( valid && str_list_sub_basic(valid, "", "") ) {
468 ret = user_in_list(talloc_tos(), user,
469 (const char **)valid);
475 if (ret && lp_onlyuser(snum)) {
476 char **user_list = str_list_make_v3(
477 talloc_tos(), lp_username(snum), NULL);
479 str_list_substitute(user_list, "%S",
480 lp_servicename(snum))) {
481 ret = user_in_list(talloc_tos(), user,
482 (const char **)user_list);
484 TALLOC_FREE(user_list);
490 /****************************************************************************
491 Validate a group username entry. Return the username or NULL.
492 ****************************************************************************/
494 static char *validate_group(struct smbd_server_connection *sconn,
495 char *group, DATA_BLOB password,int snum)
499 char *host, *user, *domain;
500 struct auth_context *actx = sconn->smb1.negprot.auth_context;
501 bool enc = sconn->smb1.negprot.encrypted_passwords;
503 while (getnetgrent(&host, &user, &domain)) {
505 if (user_ok(user, snum) &&
506 password_ok(actx, enc,
507 get_session_workgroup(sconn),
509 sconn->remote_address,
523 struct auth_context *actx = sconn->smb1.negprot.auth_context;
524 bool enc = sconn->smb1.negprot.encrypted_passwords;
527 while ((gptr = (struct group *)getgrent())) {
528 if (strequal(gptr->gr_name,group))
533 * As user_ok can recurse doing a getgrent(), we must
534 * copy the member list onto the heap before
535 * use. Bug pointed out by leon@eatworms.swmed.edu.
539 char *member_list = NULL;
544 for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
545 list_len += strlen(gptr->gr_mem[i])+1;
549 member_list = (char *)SMB_MALLOC(list_len);
556 member = member_list;
558 for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
559 size_t member_len = strlen(gptr->gr_mem[i])+1;
561 DEBUG(10,("validate_group: = gr_mem = "
562 "%s\n", gptr->gr_mem[i]));
564 strlcpy(member, gptr->gr_mem[i],
565 list_len - (member-member_list));
566 member += member_len;
571 member = member_list;
573 if (user_ok(member,snum) &&
574 password_ok(actx, enc,
575 get_session_workgroup(sconn),
577 sconn->remote_address,
579 char *name = talloc_strdup(talloc_tos(),
581 SAFE_FREE(member_list);
585 DEBUG(10,("validate_group = member = %s\n",
588 member += strlen(member) + 1;
591 SAFE_FREE(member_list);
601 /****************************************************************************
602 Check for authority to login to a service with a given username/password.
603 Note this is *NOT* used when logging on using sessionsetup_and_X.
604 ****************************************************************************/
606 bool authorise_login(struct smbd_server_connection *sconn,
607 int snum, fstring user, DATA_BLOB password,
611 struct auth_context *actx = sconn->smb1.negprot.auth_context;
612 bool enc = sconn->smb1.negprot.encrypted_passwords;
614 #ifdef DEBUG_PASSWORD
615 DEBUG(100,("authorise_login: checking authorisation on "
616 "user=%s pass=%s\n", user,password.data));
621 /* there are several possibilities:
622 1) login as the given user with given password
623 2) login as a previously registered username with the given
625 3) login as a session list username with the given password
626 4) login as a previously validated user/password pair
627 5) login as the "user =" user with given password
628 6) login as the "user =" user with no password
630 7) login as guest user with no password
632 if the service is guest_only then steps 1 to 5 are skipped
635 /* now check the list of session users */
638 char *user_list = NULL;
641 if (sconn->smb1.sessions.session_userlist)
642 user_list = SMB_STRDUP(sconn->smb1.sessions.session_userlist);
644 user_list = SMB_STRDUP("");
649 for (auser = strtok_r(user_list, LIST_SEP, &saveptr);
651 auser = strtok_r(NULL, LIST_SEP, &saveptr)) {
653 fstrcpy(user2,auser);
654 if (!user_ok(user2,snum))
657 if (password_ok(actx, enc,
658 get_session_workgroup(sconn),
660 sconn->remote_address,
663 strlcpy(user,user2,sizeof(fstring));
664 DEBUG(3,("authorise_login: ACCEPTED: session "
665 "list username (%s) and given "
666 "password ok\n", user));
670 SAFE_FREE(user_list);
673 /* check the user= fields and the given password */
674 if (!ok && lp_username(snum)) {
675 TALLOC_CTX *ctx = talloc_tos();
677 char *user_list = talloc_strdup(ctx, lp_username(snum));
684 user_list = talloc_string_sub(ctx,
687 lp_servicename(snum));
693 for (auser = strtok_r(user_list, LIST_SEP, &saveptr);
695 auser = strtok_r(NULL, LIST_SEP, &saveptr)) {
697 auser = validate_group(sconn,auser+1,
702 DEBUG(3,("authorise_login: ACCEPTED: "
703 "group username and given "
704 "password ok (%s)\n", user));
708 fstrcpy(user2,auser);
709 if (user_ok(user2,snum) &&
710 password_ok(actx, enc,
711 get_session_workgroup(sconn),
713 sconn->remote_address,
716 strlcpy(user,user2,sizeof(fstring));
717 DEBUG(3,("authorise_login: ACCEPTED: "
718 "user list username and "
719 "given password ok (%s)\n",
728 /* check for a normal guest connection */
729 if (!ok && GUEST_OK(snum)) {
730 struct passwd *guest_pw;
732 fstrcpy(guestname,lp_guestaccount());
733 guest_pw = Get_Pwnam_alloc(talloc_tos(), guestname);
734 if (guest_pw != NULL) {
735 strlcpy(user,guestname,sizeof(fstring));
737 DEBUG(3,("authorise_login: ACCEPTED: guest account "
738 "and guest ok (%s)\n", user));
740 DEBUG(0,("authorise_login: Invalid guest account "
741 "%s??\n",guestname));
743 TALLOC_FREE(guest_pw);
747 if (ok && !user_ok(user, snum)) {
748 DEBUG(0,("authorise_login: rejected invalid user %s\n",user));