source: vendor/3.6.9/source3/smbd/password.c

Last change on this file was 746, checked in by Silvan Scherrer, 13 years ago

Samba Server: updated vendor to 3.6.9
File size: 20.2 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 vuser->session_info->info3->base.full_name.string : ""));
299
300 if (!vuser->session_info->security_token) {
301 DEBUG(1, ("register_existing_vuid: session_info does not "
302 "contain a user_token - cannot continue\n"));
303 goto fail;
304 }
305
306 DEBUG(3,("register_existing_vuid: UNIX uid %d is UNIX user %s, "
307 "and will be vuid %u\n", (int)vuser->session_info->utok.uid,
308 vuser->session_info->unix_name, vuser->vuid));
309
310 if (!session_claim(sconn, vuser)) {
311 DEBUG(1, ("register_existing_vuid: Failed to claim session "
312 "for vuid=%d\n",
313 vuser->vuid));
314 goto fail;
315 }
316
317 /* Register a home dir service for this user if
318 (a) This is not a guest connection,
319 (b) we have a home directory defined
320 (c) there s not an existing static share by that name
321 If a share exists by this name (autoloaded or not) reuse it . */
322
323 vuser->homes_snum = -1;
324
325 if (!vuser->session_info->guest) {
326 vuser->homes_snum = register_homes_share(
327 vuser->session_info->unix_name);
328 }
329
330 if (srv_is_signing_negotiated(sconn) &&
331 !vuser->session_info->guest) {
332 /* Try and turn on server signing on the first non-guest
333 * sessionsetup. */
334 srv_set_signing(sconn,
335 vuser->session_info->user_session_key,
336 response_blob);
337 }
338
339 /* fill in the current_user_info struct */
340 set_current_user_info(
341 vuser->session_info->sanitized_username,
342 vuser->session_info->unix_name,
343 vuser->session_info->info3->base.domain.string);
344
345 return vuser->vuid;
346
347 fail:
348
349 if (vuser) {
350 invalidate_vuid(sconn, vuid);
351 }
352 return UID_FIELD_INVALID;
353}
354
355/****************************************************************************
356 Add a name to the session users list.
357****************************************************************************/
358
359void add_session_user(struct smbd_server_connection *sconn,
360 const char *user)
361{
362 struct passwd *pw;
363 char *tmp;
364
365 pw = Get_Pwnam_alloc(talloc_tos(), user);
366
367 if (pw == NULL) {
368 return;
369 }
370
371 if (sconn->smb1.sessions.session_userlist == NULL) {
372 sconn->smb1.sessions.session_userlist = SMB_STRDUP(pw->pw_name);
373 goto done;
374 }
375
376 if (in_list(pw->pw_name,sconn->smb1.sessions.session_userlist,false)) {
377 goto done;
378 }
379
380 if (strlen(sconn->smb1.sessions.session_userlist) > 128 * 1024) {
381 DEBUG(3,("add_session_user: session userlist already "
382 "too large.\n"));
383 goto done;
384 }
385
386 if (asprintf(&tmp, "%s %s",
387 sconn->smb1.sessions.session_userlist, pw->pw_name) == -1) {
388 DEBUG(3, ("asprintf failed\n"));
389 goto done;
390 }
391
392 SAFE_FREE(sconn->smb1.sessions.session_userlist);
393 sconn->smb1.sessions.session_userlist = tmp;
394 done:
395 TALLOC_FREE(pw);
396}
397
398/****************************************************************************
399 In security=share mode we need to store the client workgroup, as that's
400 what Vista uses for the NTLMv2 calculation.
401****************************************************************************/
402
403void add_session_workgroup(struct smbd_server_connection *sconn,
404 const char *workgroup)
405{
406 if (sconn->smb1.sessions.session_workgroup) {
407 SAFE_FREE(sconn->smb1.sessions.session_workgroup);
408 }
409 sconn->smb1.sessions.session_workgroup = smb_xstrdup(workgroup);
410}
411
412/****************************************************************************
413 In security=share mode we need to return the client workgroup, as that's
414 what Vista uses for the NTLMv2 calculation.
415****************************************************************************/
416
417const char *get_session_workgroup(struct smbd_server_connection *sconn)
418{
419 return sconn->smb1.sessions.session_workgroup;
420}
421
422/****************************************************************************
423 Check if a username is valid.
424****************************************************************************/
425
426static bool user_ok(const char *user, int snum)
427{
428 bool ret;
429
430 ret = True;
431
432 if (lp_invalid_users(snum)) {
433 char **invalid = str_list_copy(talloc_tos(),
434 lp_invalid_users(snum));
435 if (invalid &&
436 str_list_substitute(invalid, "%S", lp_servicename(snum))) {
437
438 /* This is used in sec=share only, so no current user
439 * around to pass to str_list_sub_basic() */
440
441 if ( invalid && str_list_sub_basic(invalid, "", "") ) {
442 ret = !user_in_list(talloc_tos(), user,
443 (const char **)invalid);
444 }
445 }
446 TALLOC_FREE(invalid);
447 }
448
449 if (ret && lp_valid_users(snum)) {
450 char **valid = str_list_copy(talloc_tos(),
451 lp_valid_users(snum));
452 if ( valid &&
453 str_list_substitute(valid, "%S", lp_servicename(snum)) ) {
454
455 /* This is used in sec=share only, so no current user
456 * around to pass to str_list_sub_basic() */
457
458 if ( valid && str_list_sub_basic(valid, "", "") ) {
459 ret = user_in_list(talloc_tos(), user,
460 (const char **)valid);
461 }
462 }
463 TALLOC_FREE(valid);
464 }
465
466 if (ret && lp_onlyuser(snum)) {
467 char **user_list = str_list_make_v3(
468 talloc_tos(), lp_username(snum), NULL);
469 if (user_list &&
470 str_list_substitute(user_list, "%S",
471 lp_servicename(snum))) {
472 ret = user_in_list(talloc_tos(), user,
473 (const char **)user_list);
474 }
475 TALLOC_FREE(user_list);
476 }
477
478 return(ret);
479}
480
481/****************************************************************************
482 Validate a group username entry. Return the username or NULL.
483****************************************************************************/
484
485static char *validate_group(struct smbd_server_connection *sconn,
486 char *group, DATA_BLOB password,int snum)
487{
488#ifdef HAVE_NETGROUP
489 {
490 char *host, *user, *domain;
491 struct auth_context *actx = sconn->smb1.negprot.auth_context;
492 bool enc = sconn->smb1.negprot.encrypted_passwords;
493 setnetgrent(group);
494 while (getnetgrent(&host, &user, &domain)) {
495 if (user) {
496 if (user_ok(user, snum) &&
497 password_ok(actx, enc,
498 get_session_workgroup(sconn),
499 user,password)) {
500 endnetgrent();
501 return(user);
502 }
503 }
504 }
505 endnetgrent();
506 }
507#endif
508
509#ifdef HAVE_GETGRENT
510 {
511 struct group *gptr;
512 struct auth_context *actx = sconn->smb1.negprot.auth_context;
513 bool enc = sconn->smb1.negprot.encrypted_passwords;
514
515 setgrent();
516 while ((gptr = (struct group *)getgrent())) {
517 if (strequal(gptr->gr_name,group))
518 break;
519 }
520
521 /*
522 * As user_ok can recurse doing a getgrent(), we must
523 * copy the member list onto the heap before
524 * use. Bug pointed out by leon@eatworms.swmed.edu.
525 */
526
527 if (gptr) {
528 char *member_list = NULL;
529 size_t list_len = 0;
530 char *member;
531 int i;
532
533 for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
534 list_len += strlen(gptr->gr_mem[i])+1;
535 }
536 list_len++;
537
538 member_list = (char *)SMB_MALLOC(list_len);
539 if (!member_list) {
540 endgrent();
541 return NULL;
542 }
543
544 *member_list = '\0';
545 member = member_list;
546
547 for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
548 size_t member_len = strlen(gptr->gr_mem[i])+1;
549
550 DEBUG(10,("validate_group: = gr_mem = "
551 "%s\n", gptr->gr_mem[i]));
552
553 strlcpy(member, gptr->gr_mem[i],
554 list_len - (member-member_list));
555 member += member_len;
556 }
557
558 endgrent();
559
560 member = member_list;
561 while (*member) {
562 if (user_ok(member,snum) &&
563 password_ok(actx, enc,
564 get_session_workgroup(sconn),
565 member,password)) {
566 char *name = talloc_strdup(talloc_tos(),
567 member);
568 SAFE_FREE(member_list);
569 return name;
570 }
571
572 DEBUG(10,("validate_group = member = %s\n",
573 member));
574
575 member += strlen(member) + 1;
576 }
577
578 SAFE_FREE(member_list);
579 } else {
580 endgrent();
581 return NULL;
582 }
583 }
584#endif
585 return(NULL);
586}
587
588/****************************************************************************
589 Check for authority to login to a service with a given username/password.
590 Note this is *NOT* used when logging on using sessionsetup_and_X.
591****************************************************************************/
592
593bool authorise_login(struct smbd_server_connection *sconn,
594 int snum, fstring user, DATA_BLOB password,
595 bool *guest)
596{
597 bool ok = False;
598 struct auth_context *actx = sconn->smb1.negprot.auth_context;
599 bool enc = sconn->smb1.negprot.encrypted_passwords;
600
601#ifdef DEBUG_PASSWORD
602 DEBUG(100,("authorise_login: checking authorisation on "
603 "user=%s pass=%s\n", user,password.data));
604#endif
605
606 *guest = False;
607
608 /* there are several possibilities:
609 1) login as the given user with given password
610 2) login as a previously registered username with the given
611 password
612 3) login as a session list username with the given password
613 4) login as a previously validated user/password pair
614 5) login as the "user =" user with given password
615 6) login as the "user =" user with no password
616 (guest connection)
617 7) login as guest user with no password
618
619 if the service is guest_only then steps 1 to 5 are skipped
620 */
621
622 /* now check the list of session users */
623 if (!ok) {
624 char *auser;
625 char *user_list = NULL;
626 char *saveptr;
627
628 if (sconn->smb1.sessions.session_userlist)
629 user_list = SMB_STRDUP(sconn->smb1.sessions.session_userlist);
630 else
631 user_list = SMB_STRDUP("");
632
633 if (!user_list)
634 return(False);
635
636 for (auser = strtok_r(user_list, LIST_SEP, &saveptr);
637 !ok && auser;
638 auser = strtok_r(NULL, LIST_SEP, &saveptr)) {
639 fstring user2;
640 fstrcpy(user2,auser);
641 if (!user_ok(user2,snum))
642 continue;
643
644 if (password_ok(actx, enc,
645 get_session_workgroup(sconn),
646 user2,password)) {
647 ok = True;
648 fstrcpy(user,user2);
649 DEBUG(3,("authorise_login: ACCEPTED: session "
650 "list username (%s) and given "
651 "password ok\n", user));
652 }
653 }
654
655 SAFE_FREE(user_list);
656 }
657
658 /* check the user= fields and the given password */
659 if (!ok && lp_username(snum)) {
660 TALLOC_CTX *ctx = talloc_tos();
661 char *auser;
662 char *user_list = talloc_strdup(ctx, lp_username(snum));
663 char *saveptr;
664
665 if (!user_list) {
666 goto check_guest;
667 }
668
669 user_list = talloc_string_sub(ctx,
670 user_list,
671 "%S",
672 lp_servicename(snum));
673
674 if (!user_list) {
675 goto check_guest;
676 }
677
678 for (auser = strtok_r(user_list, LIST_SEP, &saveptr);
679 auser && !ok;
680 auser = strtok_r(NULL, LIST_SEP, &saveptr)) {
681 if (*auser == '@') {
682 auser = validate_group(sconn,auser+1,
683 password,snum);
684 if (auser) {
685 ok = True;
686 fstrcpy(user,auser);
687 DEBUG(3,("authorise_login: ACCEPTED: "
688 "group username and given "
689 "password ok (%s)\n", user));
690 }
691 } else {
692 fstring user2;
693 fstrcpy(user2,auser);
694 if (user_ok(user2,snum) &&
695 password_ok(actx, enc,
696 get_session_workgroup(sconn),
697 user2,password)) {
698 ok = True;
699 fstrcpy(user,user2);
700 DEBUG(3,("authorise_login: ACCEPTED: "
701 "user list username and "
702 "given password ok (%s)\n",
703 user));
704 }
705 }
706 }
707 }
708
709 check_guest:
710
711 /* check for a normal guest connection */
712 if (!ok && GUEST_OK(snum)) {
713 struct passwd *guest_pw;
714 fstring guestname;
715 fstrcpy(guestname,lp_guestaccount());
716 guest_pw = Get_Pwnam_alloc(talloc_tos(), guestname);
717 if (guest_pw != NULL) {
718 fstrcpy(user,guestname);
719 ok = True;
720 DEBUG(3,("authorise_login: ACCEPTED: guest account "
721 "and guest ok (%s)\n", user));
722 } else {
723 DEBUG(0,("authorise_login: Invalid guest account "
724 "%s??\n",guestname));
725 }
726 TALLOC_FREE(guest_pw);
727 *guest = True;
728 }
729
730 if (ok && !user_ok(user, snum)) {
731 DEBUG(0,("authorise_login: rejected invalid user %s\n",user));
732 ok = False;
733 }
734
735 return(ok);
736}
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