source: trunk/server/source3/smbd/password.c

Last change on this file was 751, checked in by Silvan Scherrer, 13 years ago

Samba Server: updated trunk to 3.6.9
File size: 20.5 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3 Password and authentication handling
4 Copyright (C) Andrew Tridgell 1992-1998
5 Copyright (C) Jeremy Allison 2007.
6
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.
11
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.
16
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/>.
19*/
20
21#include "includes.h"
22#include "system/passwd.h"
23#include "smbd/smbd.h"
24#include "smbd/globals.h"
25#include "../librpc/gen_ndr/netlogon.h"
26#include "auth.h"
27
28/* Fix up prototypes for OSX 10.4, where they're missing */
29#ifndef HAVE_SETNETGRENT_PROTOTYPE
30extern int setnetgrent(const char* netgroup);
31#endif
32#ifndef HAVE_GETNETGRENT_PROTOTYPE
33extern int getnetgrent(char **host, char **user, char **domain);
34#endif
35#ifndef HAVE_ENDNETGRENT_PROTOTYPE
36extern void endnetgrent(void);
37#endif
38
39enum server_allocated_state { SERVER_ALLOCATED_REQUIRED_YES,
40 SERVER_ALLOCATED_REQUIRED_NO,
41 SERVER_ALLOCATED_REQUIRED_ANY};
42
43static user_struct *get_valid_user_struct_internal(
44 struct smbd_server_connection *sconn,
45 uint16 vuid,
46 enum server_allocated_state server_allocated)
47{
48 user_struct *usp;
49 int count=0;
50
51 if (vuid == UID_FIELD_INVALID)
52 return NULL;
53
54 usp=sconn->smb1.sessions.validated_users;
55 for (;usp;usp=usp->next,count++) {
56 if (vuid == usp->vuid) {
57 switch (server_allocated) {
58 case SERVER_ALLOCATED_REQUIRED_YES:
59 if (usp->session_info == NULL) {
60 continue;
61 }
62 break;
63 case SERVER_ALLOCATED_REQUIRED_NO:
64 if (usp->session_info != NULL) {
65 continue;
66 }
67 case SERVER_ALLOCATED_REQUIRED_ANY:
68 break;
69 }
70 if (count > 10) {
71 DLIST_PROMOTE(sconn->smb1.sessions.validated_users,
72 usp);
73 }
74 return usp;
75 }
76 }
77
78 return NULL;
79}
80
81/****************************************************************************
82 Check if a uid has been validated, and return an pointer to the user_struct
83 if it has. NULL if not. vuid is biased by an offset. This allows us to
84 tell random client vuid's (normally zero) from valid vuids.
85****************************************************************************/
86
87user_struct *get_valid_user_struct(struct smbd_server_connection *sconn,
88 uint16 vuid)
89{
90 return get_valid_user_struct_internal(sconn, vuid,
91 SERVER_ALLOCATED_REQUIRED_YES);
92}
93
94bool is_partial_auth_vuid(struct smbd_server_connection *sconn, uint16 vuid)
95{
96 return (get_partial_auth_user_struct(sconn, vuid) != NULL);
97}
98
99/****************************************************************************
100 Get the user struct of a partial NTLMSSP login
101****************************************************************************/
102
103user_struct *get_partial_auth_user_struct(struct smbd_server_connection *sconn,
104 uint16 vuid)
105{
106 return get_valid_user_struct_internal(sconn, vuid,
107 SERVER_ALLOCATED_REQUIRED_NO);
108}
109
110/****************************************************************************
111 Invalidate a uid.
112****************************************************************************/
113
114void invalidate_vuid(struct smbd_server_connection *sconn, uint16 vuid)
115{
116 user_struct *vuser = NULL;
117
118 vuser = get_valid_user_struct_internal(sconn, vuid,
119 SERVER_ALLOCATED_REQUIRED_ANY);
120 if (vuser == NULL) {
121 return;
122 }
123
124 session_yield(vuser);
125
126 if (vuser->auth_ntlmssp_state) {
127 TALLOC_FREE(vuser->auth_ntlmssp_state);
128 }
129
130 DLIST_REMOVE(sconn->smb1.sessions.validated_users, vuser);
131
132 /* clear the vuid from the 'cache' on each connection, and
133 from the vuid 'owner' of connections */
134 conn_clear_vuid_caches(sconn, vuid);
135
136 TALLOC_FREE(vuser);
137 sconn->smb1.sessions.num_validated_vuids--;
138}
139
140/****************************************************************************
141 Invalidate all vuid entries for this process.
142****************************************************************************/
143
144void invalidate_all_vuids(struct smbd_server_connection *sconn)
145{
146 if (sconn->using_smb2) {
147 return;
148 }
149
150 while (sconn->smb1.sessions.validated_users != NULL) {
151 invalidate_vuid(sconn,
152 sconn->smb1.sessions.validated_users->vuid);
153 }
154}
155
156static void increment_next_vuid(uint16_t *vuid)
157{
158 *vuid += 1;
159
160 /* Check for vuid wrap. */
161 if (*vuid == UID_FIELD_INVALID) {
162 *vuid = VUID_OFFSET;
163 }
164}
165
166/****************************************************
167 Create a new partial auth user struct.
168*****************************************************/
169
170int register_initial_vuid(struct smbd_server_connection *sconn)
171{
172 user_struct *vuser;
173
174 /* Paranoia check. */
175 if(lp_security() == SEC_SHARE) {
176 smb_panic("register_initial_vuid: "
177 "Tried to register uid in security=share");
178 }
179
180 /* Limit allowed vuids to 16bits - VUID_OFFSET. */
181 if (sconn->smb1.sessions.num_validated_vuids >= 0xFFFF-VUID_OFFSET) {
182 return UID_FIELD_INVALID;
183 }
184
185 if((vuser = talloc_zero(NULL, user_struct)) == NULL) {
186 DEBUG(0,("register_initial_vuid: "
187 "Failed to talloc users struct!\n"));
188 return UID_FIELD_INVALID;
189 }
190
191 /* Allocate a free vuid. Yes this is a linear search... */
192 while( get_valid_user_struct_internal(sconn,
193 sconn->smb1.sessions.next_vuid,
194 SERVER_ALLOCATED_REQUIRED_ANY) != NULL ) {
195 increment_next_vuid(&sconn->smb1.sessions.next_vuid);
196 }
197
198 DEBUG(10,("register_initial_vuid: allocated vuid = %u\n",
199 (unsigned int)sconn->smb1.sessions.next_vuid ));
200
201 vuser->vuid = sconn->smb1.sessions.next_vuid;
202
203 /*
204 * This happens in an unfinished NTLMSSP session setup. We
205 * need to allocate a vuid between the first and second calls
206 * to NTLMSSP.
207 */
208 increment_next_vuid(&sconn->smb1.sessions.next_vuid);
209 sconn->smb1.sessions.num_validated_vuids++;
210
211 DLIST_ADD(sconn->smb1.sessions.validated_users, vuser);
212 return vuser->vuid;
213}
214
215int register_homes_share(const char *username)
216{
217 int result;
218 struct passwd *pwd;
219
220 result = lp_servicenumber(username);
221 if (result != -1) {
222 DEBUG(3, ("Using static (or previously created) service for "
223 "user '%s'; path = '%s'\n", username,
224 lp_pathname(result)));
225 return result;
226 }
227
228 pwd = Get_Pwnam_alloc(talloc_tos(), username);
229
230 if ((pwd == NULL) || (pwd->pw_dir[0] == '\0')) {
231 DEBUG(3, ("No home directory defined for user '%s'\n",
232 username));
233 TALLOC_FREE(pwd);
234 return -1;
235 }
236
237#ifdef __OS2__
238 /* On OS/2 we use drive letters which have a colon. This is also the field
239 separator in master.passwd, so we use a $ instead of a colon for the drive
240 separator, ie e$/user instead of e:/user. This code simply exchanges any $
241 for a : in the user's homedir */
242 if (pwd->pw_dir[1] == '$')
243 pwd->pw_dir[1] = ':';
244#endif
245
246 DEBUG(3, ("Adding homes service for user '%s' using home directory: "
247 "'%s'\n", username, pwd->pw_dir));
248
249 result = add_home_service(username, username, pwd->pw_dir);
250
251 TALLOC_FREE(pwd);
252 return result;
253}
254
255/**
256 * register that a valid login has been performed, establish 'session'.
257 * @param session_info The token returned from the authentication process.
258 * (now 'owned' by register_existing_vuid)
259 *
260 * @param session_key The User session key for the login session (now also
261 * 'owned' by register_existing_vuid)
262 *
263 * @param respose_blob The NT challenge-response, if available. (May be
264 * freed after this call)
265 *
266 * @param smb_name The untranslated name of the user
267 *
268 * @return Newly allocated vuid, biased by an offset. (This allows us to
269 * tell random client vuid's (normally zero) from valid vuids.)
270 *
271 */
272
273int register_existing_vuid(struct smbd_server_connection *sconn,
274 uint16 vuid,
275 struct auth_serversupplied_info *session_info,
276 DATA_BLOB response_blob,
277 const char *smb_name)
278{
279 fstring tmp;
280 user_struct *vuser;
281
282 vuser = get_partial_auth_user_struct(sconn, vuid);
283 if (!vuser) {
284 goto fail;
285 }
286
287 /* Use this to keep tabs on all our info from the authentication */
288 vuser->session_info = talloc_move(vuser, &session_info);
289
290 /* This is a potentially untrusted username */
291 alpha_strcpy(tmp, smb_name, ". _-$", sizeof(tmp));
292
293 vuser->session_info->sanitized_username = talloc_strdup(
294 vuser->session_info, tmp);
295
296 DEBUG(10,("register_existing_vuid: (%u,%u) %s %s %s guest=%d\n",
297 (unsigned int)vuser->session_info->utok.uid,
298 (unsigned int)vuser->session_info->utok.gid,
299 vuser->session_info->unix_name,
300 vuser->session_info->sanitized_username,
301 vuser->session_info->info3->base.domain.string,
302 vuser->session_info->guest ));
303
304 DEBUG(3, ("register_existing_vuid: User name: %s\t"
305 "Real name: %s\n", vuser->session_info->unix_name,
306 vuser->session_info->info3->base.full_name.string ?
307 vuser->session_info->info3->base.full_name.string : ""));
308
309 if (!vuser->session_info->security_token) {
310 DEBUG(1, ("register_existing_vuid: session_info does not "
311 "contain a user_token - cannot continue\n"));
312 goto fail;
313 }
314
315 DEBUG(3,("register_existing_vuid: UNIX uid %d is UNIX user %s, "
316 "and will be vuid %u\n", (int)vuser->session_info->utok.uid,
317 vuser->session_info->unix_name, vuser->vuid));
318
319 if (!session_claim(sconn, vuser)) {
320 DEBUG(1, ("register_existing_vuid: Failed to claim session "
321 "for vuid=%d\n",
322 vuser->vuid));
323 goto fail;
324 }
325
326 /* Register a home dir service for this user if
327 (a) This is not a guest connection,
328 (b) we have a home directory defined
329 (c) there s not an existing static share by that name
330 If a share exists by this name (autoloaded or not) reuse it . */
331
332 vuser->homes_snum = -1;
333
334 if (!vuser->session_info->guest) {
335 vuser->homes_snum = register_homes_share(
336 vuser->session_info->unix_name);
337 }
338
339 if (srv_is_signing_negotiated(sconn) &&
340 !vuser->session_info->guest) {
341 /* Try and turn on server signing on the first non-guest
342 * sessionsetup. */
343 srv_set_signing(sconn,
344 vuser->session_info->user_session_key,
345 response_blob);
346 }
347
348 /* fill in the current_user_info struct */
349 set_current_user_info(
350 vuser->session_info->sanitized_username,
351 vuser->session_info->unix_name,
352 vuser->session_info->info3->base.domain.string);
353
354 return vuser->vuid;
355
356 fail:
357
358 if (vuser) {
359 invalidate_vuid(sconn, vuid);
360 }
361 return UID_FIELD_INVALID;
362}
363
364/****************************************************************************
365 Add a name to the session users list.
366****************************************************************************/
367
368void add_session_user(struct smbd_server_connection *sconn,
369 const char *user)
370{
371 struct passwd *pw;
372 char *tmp;
373
374 pw = Get_Pwnam_alloc(talloc_tos(), user);
375
376 if (pw == NULL) {
377 return;
378 }
379
380 if (sconn->smb1.sessions.session_userlist == NULL) {
381 sconn->smb1.sessions.session_userlist = SMB_STRDUP(pw->pw_name);
382 goto done;
383 }
384
385 if (in_list(pw->pw_name,sconn->smb1.sessions.session_userlist,false)) {
386 goto done;
387 }
388
389 if (strlen(sconn->smb1.sessions.session_userlist) > 128 * 1024) {
390 DEBUG(3,("add_session_user: session userlist already "
391 "too large.\n"));
392 goto done;
393 }
394
395 if (asprintf(&tmp, "%s %s",
396 sconn->smb1.sessions.session_userlist, pw->pw_name) == -1) {
397 DEBUG(3, ("asprintf failed\n"));
398 goto done;
399 }
400
401 SAFE_FREE(sconn->smb1.sessions.session_userlist);
402 sconn->smb1.sessions.session_userlist = tmp;
403 done:
404 TALLOC_FREE(pw);
405}
406
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****************************************************************************/
411
412void add_session_workgroup(struct smbd_server_connection *sconn,
413 const char *workgroup)
414{
415 if (sconn->smb1.sessions.session_workgroup) {
416 SAFE_FREE(sconn->smb1.sessions.session_workgroup);
417 }
418 sconn->smb1.sessions.session_workgroup = smb_xstrdup(workgroup);
419}
420
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****************************************************************************/
425
426const char *get_session_workgroup(struct smbd_server_connection *sconn)
427{
428 return sconn->smb1.sessions.session_workgroup;
429}
430
431/****************************************************************************
432 Check if a username is valid.
433****************************************************************************/
434
435static bool user_ok(const char *user, int snum)
436{
437 bool ret;
438
439 ret = True;
440
441 if (lp_invalid_users(snum)) {
442 char **invalid = str_list_copy(talloc_tos(),
443 lp_invalid_users(snum));
444 if (invalid &&
445 str_list_substitute(invalid, "%S", lp_servicename(snum))) {
446
447 /* This is used in sec=share only, so no current user
448 * around to pass to str_list_sub_basic() */
449
450 if ( invalid && str_list_sub_basic(invalid, "", "") ) {
451 ret = !user_in_list(talloc_tos(), user,
452 (const char **)invalid);
453 }
454 }
455 TALLOC_FREE(invalid);
456 }
457
458 if (ret && lp_valid_users(snum)) {
459 char **valid = str_list_copy(talloc_tos(),
460 lp_valid_users(snum));
461 if ( valid &&
462 str_list_substitute(valid, "%S", lp_servicename(snum)) ) {
463
464 /* This is used in sec=share only, so no current user
465 * around to pass to str_list_sub_basic() */
466
467 if ( valid && str_list_sub_basic(valid, "", "") ) {
468 ret = user_in_list(talloc_tos(), user,
469 (const char **)valid);
470 }
471 }
472 TALLOC_FREE(valid);
473 }
474
475 if (ret && lp_onlyuser(snum)) {
476 char **user_list = str_list_make_v3(
477 talloc_tos(), lp_username(snum), NULL);
478 if (user_list &&
479 str_list_substitute(user_list, "%S",
480 lp_servicename(snum))) {
481 ret = user_in_list(talloc_tos(), user,
482 (const char **)user_list);
483 }
484 TALLOC_FREE(user_list);
485 }
486
487 return(ret);
488}
489
490/****************************************************************************
491 Validate a group username entry. Return the username or NULL.
492****************************************************************************/
493
494static char *validate_group(struct smbd_server_connection *sconn,
495 char *group, DATA_BLOB password,int snum)
496{
497#ifdef HAVE_NETGROUP
498 {
499 char *host, *user, *domain;
500 struct auth_context *actx = sconn->smb1.negprot.auth_context;
501 bool enc = sconn->smb1.negprot.encrypted_passwords;
502 setnetgrent(group);
503 while (getnetgrent(&host, &user, &domain)) {
504 if (user) {
505 if (user_ok(user, snum) &&
506 password_ok(actx, enc,
507 get_session_workgroup(sconn),
508 user,password)) {
509 endnetgrent();
510 return(user);
511 }
512 }
513 }
514 endnetgrent();
515 }
516#endif
517
518#ifdef HAVE_GETGRENT
519 {
520 struct group *gptr;
521 struct auth_context *actx = sconn->smb1.negprot.auth_context;
522 bool enc = sconn->smb1.negprot.encrypted_passwords;
523
524 setgrent();
525 while ((gptr = (struct group *)getgrent())) {
526 if (strequal(gptr->gr_name,group))
527 break;
528 }
529
530 /*
531 * As user_ok can recurse doing a getgrent(), we must
532 * copy the member list onto the heap before
533 * use. Bug pointed out by leon@eatworms.swmed.edu.
534 */
535
536 if (gptr) {
537 char *member_list = NULL;
538 size_t list_len = 0;
539 char *member;
540 int i;
541
542 for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
543 list_len += strlen(gptr->gr_mem[i])+1;
544 }
545 list_len++;
546
547 member_list = (char *)SMB_MALLOC(list_len);
548 if (!member_list) {
549 endgrent();
550 return NULL;
551 }
552
553 *member_list = '\0';
554 member = member_list;
555
556 for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
557 size_t member_len = strlen(gptr->gr_mem[i])+1;
558
559 DEBUG(10,("validate_group: = gr_mem = "
560 "%s\n", gptr->gr_mem[i]));
561
562 strlcpy(member, gptr->gr_mem[i],
563 list_len - (member-member_list));
564 member += member_len;
565 }
566
567 endgrent();
568
569 member = member_list;
570 while (*member) {
571 if (user_ok(member,snum) &&
572 password_ok(actx, enc,
573 get_session_workgroup(sconn),
574 member,password)) {
575 char *name = talloc_strdup(talloc_tos(),
576 member);
577 SAFE_FREE(member_list);
578 return name;
579 }
580
581 DEBUG(10,("validate_group = member = %s\n",
582 member));
583
584 member += strlen(member) + 1;
585 }
586
587 SAFE_FREE(member_list);
588 } else {
589 endgrent();
590 return NULL;
591 }
592 }
593#endif
594 return(NULL);
595}
596
597/****************************************************************************
598 Check for authority to login to a service with a given username/password.
599 Note this is *NOT* used when logging on using sessionsetup_and_X.
600****************************************************************************/
601
602bool authorise_login(struct smbd_server_connection *sconn,
603 int snum, fstring user, DATA_BLOB password,
604 bool *guest)
605{
606 bool ok = False;
607 struct auth_context *actx = sconn->smb1.negprot.auth_context;
608 bool enc = sconn->smb1.negprot.encrypted_passwords;
609
610#ifdef DEBUG_PASSWORD
611 DEBUG(100,("authorise_login: checking authorisation on "
612 "user=%s pass=%s\n", user,password.data));
613#endif
614
615 *guest = False;
616
617 /* there are several possibilities:
618 1) login as the given user with given password
619 2) login as a previously registered username with the given
620 password
621 3) login as a session list username with the given password
622 4) login as a previously validated user/password pair
623 5) login as the "user =" user with given password
624 6) login as the "user =" user with no password
625 (guest connection)
626 7) login as guest user with no password
627
628 if the service is guest_only then steps 1 to 5 are skipped
629 */
630
631 /* now check the list of session users */
632 if (!ok) {
633 char *auser;
634 char *user_list = NULL;
635 char *saveptr;
636
637 if (sconn->smb1.sessions.session_userlist)
638 user_list = SMB_STRDUP(sconn->smb1.sessions.session_userlist);
639 else
640 user_list = SMB_STRDUP("");
641
642 if (!user_list)
643 return(False);
644
645 for (auser = strtok_r(user_list, LIST_SEP, &saveptr);
646 !ok && auser;
647 auser = strtok_r(NULL, LIST_SEP, &saveptr)) {
648 fstring user2;
649 fstrcpy(user2,auser);
650 if (!user_ok(user2,snum))
651 continue;
652
653 if (password_ok(actx, enc,
654 get_session_workgroup(sconn),
655 user2,password)) {
656 ok = True;
657 fstrcpy(user,user2);
658 DEBUG(3,("authorise_login: ACCEPTED: session "
659 "list username (%s) and given "
660 "password ok\n", user));
661 }
662 }
663
664 SAFE_FREE(user_list);
665 }
666
667 /* check the user= fields and the given password */
668 if (!ok && lp_username(snum)) {
669 TALLOC_CTX *ctx = talloc_tos();
670 char *auser;
671 char *user_list = talloc_strdup(ctx, lp_username(snum));
672 char *saveptr;
673
674 if (!user_list) {
675 goto check_guest;
676 }
677
678 user_list = talloc_string_sub(ctx,
679 user_list,
680 "%S",
681 lp_servicename(snum));
682
683 if (!user_list) {
684 goto check_guest;
685 }
686
687 for (auser = strtok_r(user_list, LIST_SEP, &saveptr);
688 auser && !ok;
689 auser = strtok_r(NULL, LIST_SEP, &saveptr)) {
690 if (*auser == '@') {
691 auser = validate_group(sconn,auser+1,
692 password,snum);
693 if (auser) {
694 ok = True;
695 fstrcpy(user,auser);
696 DEBUG(3,("authorise_login: ACCEPTED: "
697 "group username and given "
698 "password ok (%s)\n", user));
699 }
700 } else {
701 fstring user2;
702 fstrcpy(user2,auser);
703 if (user_ok(user2,snum) &&
704 password_ok(actx, enc,
705 get_session_workgroup(sconn),
706 user2,password)) {
707 ok = True;
708 fstrcpy(user,user2);
709 DEBUG(3,("authorise_login: ACCEPTED: "
710 "user list username and "
711 "given password ok (%s)\n",
712 user));
713 }
714 }
715 }
716 }
717
718 check_guest:
719
720 /* check for a normal guest connection */
721 if (!ok && GUEST_OK(snum)) {
722 struct passwd *guest_pw;
723 fstring guestname;
724 fstrcpy(guestname,lp_guestaccount());
725 guest_pw = Get_Pwnam_alloc(talloc_tos(), guestname);
726 if (guest_pw != NULL) {
727 fstrcpy(user,guestname);
728 ok = True;
729 DEBUG(3,("authorise_login: ACCEPTED: guest account "
730 "and guest ok (%s)\n", user));
731 } else {
732 DEBUG(0,("authorise_login: Invalid guest account "
733 "%s??\n",guestname));
734 }
735 TALLOC_FREE(guest_pw);
736 *guest = True;
737 }
738
739 if (ok && !user_ok(user, snum)) {
740 DEBUG(0,("authorise_login: rejected invalid user %s\n",user));
741 ok = False;
742 }
743
744 return(ok);
745}
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