source: vendor/3.6.0/source3/smbd/password.c

Last change on this file was 740, checked in by Silvan Scherrer, 13 years ago

Samba Server: update vendor to 3.6.0
File size: 20.1 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 DEBUG(3, ("Adding homes service for user '%s' using home directory: "
238 "'%s'\n", username, pwd->pw_dir));
239
240 result = add_home_service(username, username, pwd->pw_dir);
241
242 TALLOC_FREE(pwd);
243 return result;
244}
245
246/**
247 * register that a valid login has been performed, establish 'session'.
248 * @param session_info The token returned from the authentication process.
249 * (now 'owned' by register_existing_vuid)
250 *
251 * @param session_key The User session key for the login session (now also
252 * 'owned' by register_existing_vuid)
253 *
254 * @param respose_blob The NT challenge-response, if available. (May be
255 * freed after this call)
256 *
257 * @param smb_name The untranslated name of the user
258 *
259 * @return Newly allocated vuid, biased by an offset. (This allows us to
260 * tell random client vuid's (normally zero) from valid vuids.)
261 *
262 */
263
264int register_existing_vuid(struct smbd_server_connection *sconn,
265 uint16 vuid,
266 struct auth_serversupplied_info *session_info,
267 DATA_BLOB response_blob,
268 const char *smb_name)
269{
270 fstring tmp;
271 user_struct *vuser;
272
273 vuser = get_partial_auth_user_struct(sconn, vuid);
274 if (!vuser) {
275 goto fail;
276 }
277
278 /* Use this to keep tabs on all our info from the authentication */
279 vuser->session_info = talloc_move(vuser, &session_info);
280
281 /* This is a potentially untrusted username */
282 alpha_strcpy(tmp, smb_name, ". _-$", sizeof(tmp));
283
284 vuser->session_info->sanitized_username = talloc_strdup(
285 vuser->session_info, tmp);
286
287 DEBUG(10,("register_existing_vuid: (%u,%u) %s %s %s guest=%d\n",
288 (unsigned int)vuser->session_info->utok.uid,
289 (unsigned int)vuser->session_info->utok.gid,
290 vuser->session_info->unix_name,
291 vuser->session_info->sanitized_username,
292 vuser->session_info->info3->base.domain.string,
293 vuser->session_info->guest ));
294
295 DEBUG(3, ("register_existing_vuid: User name: %s\t"
296 "Real name: %s\n", vuser->session_info->unix_name,
297 vuser->session_info->info3->base.full_name.string));
298
299 if (!vuser->session_info->security_token) {
300 DEBUG(1, ("register_existing_vuid: session_info does not "
301 "contain a user_token - cannot continue\n"));
302 goto fail;
303 }
304
305 DEBUG(3,("register_existing_vuid: UNIX uid %d is UNIX user %s, "
306 "and will be vuid %u\n", (int)vuser->session_info->utok.uid,
307 vuser->session_info->unix_name, vuser->vuid));
308
309 if (!session_claim(sconn, vuser)) {
310 DEBUG(1, ("register_existing_vuid: Failed to claim session "
311 "for vuid=%d\n",
312 vuser->vuid));
313 goto fail;
314 }
315
316 /* Register a home dir service for this user if
317 (a) This is not a guest connection,
318 (b) we have a home directory defined
319 (c) there s not an existing static share by that name
320 If a share exists by this name (autoloaded or not) reuse it . */
321
322 vuser->homes_snum = -1;
323
324 if (!vuser->session_info->guest) {
325 vuser->homes_snum = register_homes_share(
326 vuser->session_info->unix_name);
327 }
328
329 if (srv_is_signing_negotiated(sconn) &&
330 !vuser->session_info->guest) {
331 /* Try and turn on server signing on the first non-guest
332 * sessionsetup. */
333 srv_set_signing(sconn,
334 vuser->session_info->user_session_key,
335 response_blob);
336 }
337
338 /* fill in the current_user_info struct */
339 set_current_user_info(
340 vuser->session_info->sanitized_username,
341 vuser->session_info->unix_name,
342 vuser->session_info->info3->base.domain.string);
343
344 return vuser->vuid;
345
346 fail:
347
348 if (vuser) {
349 invalidate_vuid(sconn, vuid);
350 }
351 return UID_FIELD_INVALID;
352}
353
354/****************************************************************************
355 Add a name to the session users list.
356****************************************************************************/
357
358void add_session_user(struct smbd_server_connection *sconn,
359 const char *user)
360{
361 struct passwd *pw;
362 char *tmp;
363
364 pw = Get_Pwnam_alloc(talloc_tos(), user);
365
366 if (pw == NULL) {
367 return;
368 }
369
370 if (sconn->smb1.sessions.session_userlist == NULL) {
371 sconn->smb1.sessions.session_userlist = SMB_STRDUP(pw->pw_name);
372 goto done;
373 }
374
375 if (in_list(pw->pw_name,sconn->smb1.sessions.session_userlist,false)) {
376 goto done;
377 }
378
379 if (strlen(sconn->smb1.sessions.session_userlist) > 128 * 1024) {
380 DEBUG(3,("add_session_user: session userlist already "
381 "too large.\n"));
382 goto done;
383 }
384
385 if (asprintf(&tmp, "%s %s",
386 sconn->smb1.sessions.session_userlist, pw->pw_name) == -1) {
387 DEBUG(3, ("asprintf failed\n"));
388 goto done;
389 }
390
391 SAFE_FREE(sconn->smb1.sessions.session_userlist);
392 sconn->smb1.sessions.session_userlist = tmp;
393 done:
394 TALLOC_FREE(pw);
395}
396
397/****************************************************************************
398 In security=share mode we need to store the client workgroup, as that's
399 what Vista uses for the NTLMv2 calculation.
400****************************************************************************/
401
402void add_session_workgroup(struct smbd_server_connection *sconn,
403 const char *workgroup)
404{
405 if (sconn->smb1.sessions.session_workgroup) {
406 SAFE_FREE(sconn->smb1.sessions.session_workgroup);
407 }
408 sconn->smb1.sessions.session_workgroup = smb_xstrdup(workgroup);
409}
410
411/****************************************************************************
412 In security=share mode we need to return the client workgroup, as that's
413 what Vista uses for the NTLMv2 calculation.
414****************************************************************************/
415
416const char *get_session_workgroup(struct smbd_server_connection *sconn)
417{
418 return sconn->smb1.sessions.session_workgroup;
419}
420
421/****************************************************************************
422 Check if a username is valid.
423****************************************************************************/
424
425static bool user_ok(const char *user, int snum)
426{
427 bool ret;
428
429 ret = True;
430
431 if (lp_invalid_users(snum)) {
432 char **invalid = str_list_copy(talloc_tos(),
433 lp_invalid_users(snum));
434 if (invalid &&
435 str_list_substitute(invalid, "%S", lp_servicename(snum))) {
436
437 /* This is used in sec=share only, so no current user
438 * around to pass to str_list_sub_basic() */
439
440 if ( invalid && str_list_sub_basic(invalid, "", "") ) {
441 ret = !user_in_list(talloc_tos(), user,
442 (const char **)invalid);
443 }
444 }
445 TALLOC_FREE(invalid);
446 }
447
448 if (ret && lp_valid_users(snum)) {
449 char **valid = str_list_copy(talloc_tos(),
450 lp_valid_users(snum));
451 if ( valid &&
452 str_list_substitute(valid, "%S", lp_servicename(snum)) ) {
453
454 /* This is used in sec=share only, so no current user
455 * around to pass to str_list_sub_basic() */
456
457 if ( valid && str_list_sub_basic(valid, "", "") ) {
458 ret = user_in_list(talloc_tos(), user,
459 (const char **)valid);
460 }
461 }
462 TALLOC_FREE(valid);
463 }
464
465 if (ret && lp_onlyuser(snum)) {
466 char **user_list = str_list_make_v3(
467 talloc_tos(), lp_username(snum), NULL);
468 if (user_list &&
469 str_list_substitute(user_list, "%S",
470 lp_servicename(snum))) {
471 ret = user_in_list(talloc_tos(), user,
472 (const char **)user_list);
473 }
474 TALLOC_FREE(user_list);
475 }
476
477 return(ret);
478}
479
480/****************************************************************************
481 Validate a group username entry. Return the username or NULL.
482****************************************************************************/
483
484static char *validate_group(struct smbd_server_connection *sconn,
485 char *group, DATA_BLOB password,int snum)
486{
487#ifdef HAVE_NETGROUP
488 {
489 char *host, *user, *domain;
490 struct auth_context *actx = sconn->smb1.negprot.auth_context;
491 bool enc = sconn->smb1.negprot.encrypted_passwords;
492 setnetgrent(group);
493 while (getnetgrent(&host, &user, &domain)) {
494 if (user) {
495 if (user_ok(user, snum) &&
496 password_ok(actx, enc,
497 get_session_workgroup(sconn),
498 user,password)) {
499 endnetgrent();
500 return(user);
501 }
502 }
503 }
504 endnetgrent();
505 }
506#endif
507
508#ifdef HAVE_GETGRENT
509 {
510 struct group *gptr;
511 struct auth_context *actx = sconn->smb1.negprot.auth_context;
512 bool enc = sconn->smb1.negprot.encrypted_passwords;
513
514 setgrent();
515 while ((gptr = (struct group *)getgrent())) {
516 if (strequal(gptr->gr_name,group))
517 break;
518 }
519
520 /*
521 * As user_ok can recurse doing a getgrent(), we must
522 * copy the member list onto the heap before
523 * use. Bug pointed out by leon@eatworms.swmed.edu.
524 */
525
526 if (gptr) {
527 char *member_list = NULL;
528 size_t list_len = 0;
529 char *member;
530 int i;
531
532 for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
533 list_len += strlen(gptr->gr_mem[i])+1;
534 }
535 list_len++;
536
537 member_list = (char *)SMB_MALLOC(list_len);
538 if (!member_list) {
539 endgrent();
540 return NULL;
541 }
542
543 *member_list = '\0';
544 member = member_list;
545
546 for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
547 size_t member_len = strlen(gptr->gr_mem[i])+1;
548
549 DEBUG(10,("validate_group: = gr_mem = "
550 "%s\n", gptr->gr_mem[i]));
551
552 strlcpy(member, gptr->gr_mem[i],
553 list_len - (member-member_list));
554 member += member_len;
555 }
556
557 endgrent();
558
559 member = member_list;
560 while (*member) {
561 if (user_ok(member,snum) &&
562 password_ok(actx, enc,
563 get_session_workgroup(sconn),
564 member,password)) {
565 char *name = talloc_strdup(talloc_tos(),
566 member);
567 SAFE_FREE(member_list);
568 return name;
569 }
570
571 DEBUG(10,("validate_group = member = %s\n",
572 member));
573
574 member += strlen(member) + 1;
575 }
576
577 SAFE_FREE(member_list);
578 } else {
579 endgrent();
580 return NULL;
581 }
582 }
583#endif
584 return(NULL);
585}
586
587/****************************************************************************
588 Check for authority to login to a service with a given username/password.
589 Note this is *NOT* used when logging on using sessionsetup_and_X.
590****************************************************************************/
591
592bool authorise_login(struct smbd_server_connection *sconn,
593 int snum, fstring user, DATA_BLOB password,
594 bool *guest)
595{
596 bool ok = False;
597 struct auth_context *actx = sconn->smb1.negprot.auth_context;
598 bool enc = sconn->smb1.negprot.encrypted_passwords;
599
600#ifdef DEBUG_PASSWORD
601 DEBUG(100,("authorise_login: checking authorisation on "
602 "user=%s pass=%s\n", user,password.data));
603#endif
604
605 *guest = False;
606
607 /* there are several possibilities:
608 1) login as the given user with given password
609 2) login as a previously registered username with the given
610 password
611 3) login as a session list username with the given password
612 4) login as a previously validated user/password pair
613 5) login as the "user =" user with given password
614 6) login as the "user =" user with no password
615 (guest connection)
616 7) login as guest user with no password
617
618 if the service is guest_only then steps 1 to 5 are skipped
619 */
620
621 /* now check the list of session users */
622 if (!ok) {
623 char *auser;
624 char *user_list = NULL;
625 char *saveptr;
626
627 if (sconn->smb1.sessions.session_userlist)
628 user_list = SMB_STRDUP(sconn->smb1.sessions.session_userlist);
629 else
630 user_list = SMB_STRDUP("");
631
632 if (!user_list)
633 return(False);
634
635 for (auser = strtok_r(user_list, LIST_SEP, &saveptr);
636 !ok && auser;
637 auser = strtok_r(NULL, LIST_SEP, &saveptr)) {
638 fstring user2;
639 fstrcpy(user2,auser);
640 if (!user_ok(user2,snum))
641 continue;
642
643 if (password_ok(actx, enc,
644 get_session_workgroup(sconn),
645 user2,password)) {
646 ok = True;
647 fstrcpy(user,user2);
648 DEBUG(3,("authorise_login: ACCEPTED: session "
649 "list username (%s) and given "
650 "password ok\n", user));
651 }
652 }
653
654 SAFE_FREE(user_list);
655 }
656
657 /* check the user= fields and the given password */
658 if (!ok && lp_username(snum)) {
659 TALLOC_CTX *ctx = talloc_tos();
660 char *auser;
661 char *user_list = talloc_strdup(ctx, lp_username(snum));
662 char *saveptr;
663
664 if (!user_list) {
665 goto check_guest;
666 }
667
668 user_list = talloc_string_sub(ctx,
669 user_list,
670 "%S",
671 lp_servicename(snum));
672
673 if (!user_list) {
674 goto check_guest;
675 }
676
677 for (auser = strtok_r(user_list, LIST_SEP, &saveptr);
678 auser && !ok;
679 auser = strtok_r(NULL, LIST_SEP, &saveptr)) {
680 if (*auser == '@') {
681 auser = validate_group(sconn,auser+1,
682 password,snum);
683 if (auser) {
684 ok = True;
685 fstrcpy(user,auser);
686 DEBUG(3,("authorise_login: ACCEPTED: "
687 "group username and given "
688 "password ok (%s)\n", user));
689 }
690 } else {
691 fstring user2;
692 fstrcpy(user2,auser);
693 if (user_ok(user2,snum) &&
694 password_ok(actx, enc,
695 get_session_workgroup(sconn),
696 user2,password)) {
697 ok = True;
698 fstrcpy(user,user2);
699 DEBUG(3,("authorise_login: ACCEPTED: "
700 "user list username and "
701 "given password ok (%s)\n",
702 user));
703 }
704 }
705 }
706 }
707
708 check_guest:
709
710 /* check for a normal guest connection */
711 if (!ok && GUEST_OK(snum)) {
712 struct passwd *guest_pw;
713 fstring guestname;
714 fstrcpy(guestname,lp_guestaccount());
715 guest_pw = Get_Pwnam_alloc(talloc_tos(), guestname);
716 if (guest_pw != NULL) {
717 fstrcpy(user,guestname);
718 ok = True;
719 DEBUG(3,("authorise_login: ACCEPTED: guest account "
720 "and guest ok (%s)\n", user));
721 } else {
722 DEBUG(0,("authorise_login: Invalid guest account "
723 "%s??\n",guestname));
724 }
725 TALLOC_FREE(guest_pw);
726 *guest = True;
727 }
728
729 if (ok && !user_ok(user, snum)) {
730 DEBUG(0,("authorise_login: rejected invalid user %s\n",user));
731 ok = False;
732 }
733
734 return(ok);
735}
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