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dnsp: Parse TXT records
[Samba/gebeck_regimport.git] / source3 / smbd / service.c
blob675ae2b0d5644a306f3f6384152e0ba35bcf5315
1 /*
2 Unix SMB/CIFS implementation.
3 service (connection) opening and closing
4 Copyright (C) Andrew Tridgell 1992-1998
5
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 3 of the License, or
9 (at your option) any later version.
10
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.
15
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20 #include "includes.h"
21 #include "smbd/globals.h"
22 #include "../librpc/gen_ndr/netlogon.h"
23
24 extern userdom_struct current_user_info;
25
26 static bool canonicalize_connect_path(connection_struct *conn)
27 {
28 #ifdef REALPATH_TAKES_NULL
29 bool ret;
30 char *resolved_name = SMB_VFS_REALPATH(conn,conn->connectpath,NULL);
31 if (!resolved_name) {
32 return false;
33 }
34 ret = set_conn_connectpath(conn,resolved_name);
35 SAFE_FREE(resolved_name);
36 return ret;
37 #else
38 char resolved_name_buf[PATH_MAX+1];
39 char *resolved_name = SMB_VFS_REALPATH(conn,conn->connectpath,resolved_name_buf);
40 if (!resolved_name) {
41 return false;
42 }
43 return set_conn_connectpath(conn,resolved_name);
44 #endif /* REALPATH_TAKES_NULL */
45 }
46
47 /****************************************************************************
48 Ensure when setting connectpath it is a canonicalized (no ./ // or ../)
49 absolute path stating in / and not ending in /.
50 Observent people will notice a similarity between this and check_path_syntax :-).
51 ****************************************************************************/
52
53 bool set_conn_connectpath(connection_struct *conn, const char *connectpath)
54 {
55 char *destname;
56 char *d;
57 const char *s = connectpath;
58 bool start_of_name_component = true;
59
60 if (connectpath == NULL || connectpath[0] == '\0') {
61 return false;
62 }
63
64 /* Allocate for strlen + '\0' + possible leading '/' */
65 destname = (char *)SMB_MALLOC(strlen(connectpath) + 2);
66 if (!destname) {
67 return false;
68 }
69 d = destname;
70
71 *d++ = '/'; /* Always start with root. */
72
73 while (*s) {
74 if (*s == '/') {
75 /* Eat multiple '/' */
76 while (*s == '/') {
77 s++;
78 }
79 if ((d > destname + 1) && (*s != '\0')) {
80 *d++ = '/';
81 }
82 start_of_name_component = True;
83 continue;
84 }
85
86 if (start_of_name_component) {
87 if ((s[0] == '.') && (s[1] == '.') && (s[2] == '/' || s[2] == '\0')) {
88 /* Uh oh - "/../" or "/..\0" ! */
89
90 /* Go past the ../ or .. */
91 if (s[2] == '/') {
92 s += 3;
93 } else {
94 s += 2; /* Go past the .. */
95 }
96
97 /* If we just added a '/' - delete it */
98 if ((d > destname) && (*(d-1) == '/')) {
99 *(d-1) = '\0';
100 d--;
101 }
102
103 /* Are we at the start ? Can't go back further if so. */
104 if (d <= destname) {
105 *d++ = '/'; /* Can't delete root */
106 continue;
107 }
108 /* Go back one level... */
109 /* Decrement d first as d points to the *next* char to write into. */
110 for (d--; d > destname; d--) {
111 if (*d == '/') {
112 break;
113 }
114 }
115 /* We're still at the start of a name component, just the previous one. */
116 continue;
117 } else if ((s[0] == '.') && ((s[1] == '\0') || s[1] == '/')) {
118 /* Component of pathname can't be "." only - skip the '.' . */
119 if (s[1] == '/') {
120 s += 2;
121 } else {
122 s++;
123 }
124 continue;
125 }
126 }
127
128 if (!(*s & 0x80)) {
129 *d++ = *s++;
130 } else {
131 size_t siz;
132 /* Get the size of the next MB character. */
133 next_codepoint(s,&siz);
134 switch(siz) {
135 case 5:
136 *d++ = *s++;
137 /*fall through*/
138 case 4:
139 *d++ = *s++;
140 /*fall through*/
141 case 3:
142 *d++ = *s++;
143 /*fall through*/
144 case 2:
145 *d++ = *s++;
146 /*fall through*/
147 case 1:
148 *d++ = *s++;
149 break;
150 default:
151 break;
152 }
153 }
154 start_of_name_component = false;
155 }
156 *d = '\0';
157
158 /* And must not end in '/' */
159 if (d > destname + 1 && (*(d-1) == '/')) {
160 *(d-1) = '\0';
161 }
162
163 DEBUG(10,("set_conn_connectpath: service %s, connectpath = %s\n",
164 lp_servicename(SNUM(conn)), destname ));
165
166 string_set(&conn->connectpath, destname);
167 SAFE_FREE(destname);
168 return true;
169 }
170
171 /****************************************************************************
172 Load parameters specific to a connection/service.
173 ****************************************************************************/
174
175 bool set_current_service(connection_struct *conn, uint16 flags, bool do_chdir)
176 {
177 int snum;
178
179 if (!conn) {
180 last_conn = NULL;
181 return(False);
182 }
183
184 conn->lastused_count++;
185
186 snum = SNUM(conn);
187
188 if (do_chdir &&
189 vfs_ChDir(conn,conn->connectpath) != 0 &&
190 vfs_ChDir(conn,conn->origpath) != 0) {
191 DEBUG(((errno!=EACCES)?0:3),("chdir (%s) failed, reason: %s\n",
192 conn->connectpath, strerror(errno)));
193 return(False);
194 }
195
196 if ((conn == last_conn) && (last_flags == flags)) {
197 return(True);
198 }
199
200 last_conn = conn;
201 last_flags = flags;
202
203 /* Obey the client case sensitivity requests - only for clients that support it. */
204 switch (lp_casesensitive(snum)) {
205 case Auto:
206 {
207 /* We need this uglyness due to DOS/Win9x clients that lie about case insensitivity. */
208 enum remote_arch_types ra_type = get_remote_arch();
209 if ((ra_type != RA_SAMBA) && (ra_type != RA_CIFSFS)) {
210 /* Client can't support per-packet case sensitive pathnames. */
211 conn->case_sensitive = False;
212 } else {
213 conn->case_sensitive = !(flags & FLAG_CASELESS_PATHNAMES);
214 }
215 }
216 break;
217 case True:
218 conn->case_sensitive = True;
219 break;
220 default:
221 conn->case_sensitive = False;
222 break;
223 }
224 return(True);
225 }
226
227 static int load_registry_service(const char *servicename)
228 {
229 if (!lp_registry_shares()) {
230 return -1;
231 }
232
233 if ((servicename == NULL) || (*servicename == '\0')) {
234 return -1;
235 }
236
237 if (strequal(servicename, GLOBAL_NAME)) {
238 return -2;
239 }
240
241 if (!process_registry_service(servicename)) {
242 return -1;
243 }
244
245 return lp_servicenumber(servicename);
246 }
247
248 void load_registry_shares(void)
249 {
250 DEBUG(8, ("load_registry_shares()\n"));
251 if (!lp_registry_shares()) {
252 return;
253 }
254
255 process_registry_shares();
256
257 return;
258 }
259
260 /****************************************************************************
261 Add a home service. Returns the new service number or -1 if fail.
262 ****************************************************************************/
263
264 int add_home_service(const char *service, const char *username, const char *homedir)
265 {
266 int iHomeService;
267
268 if (!service || !homedir || homedir[0] == '\0')
269 return -1;
270
271 if ((iHomeService = lp_servicenumber(HOMES_NAME)) < 0) {
272 if ((iHomeService = load_registry_service(HOMES_NAME)) < 0) {
273 return -1;
274 }
275 }
276
277 /*
278 * If this is a winbindd provided username, remove
279 * the domain component before adding the service.
280 * Log a warning if the "path=" parameter does not
281 * include any macros.
282 */
283
284 {
285 const char *p = strchr(service,*lp_winbind_separator());
286
287 /* We only want the 'user' part of the string */
288 if (p) {
289 service = p + 1;
290 }
291 }
292
293 if (!lp_add_home(service, iHomeService, username, homedir)) {
294 return -1;
295 }
296
297 return lp_servicenumber(service);
298
299 }
300
301 /**
302 * Find a service entry.
303 *
304 * @param service is modified (to canonical form??)
305 **/
306
307 int find_service(fstring service)
308 {
309 int iService;
310
311 all_string_sub(service,"\\","/",0);
312
313 iService = lp_servicenumber(service);
314
315 /* now handle the special case of a home directory */
316 if (iService < 0) {
317 char *phome_dir = get_user_home_dir(talloc_tos(), service);
318
319 if(!phome_dir) {
320 /*
321 * Try mapping the servicename, it may
322 * be a Windows to unix mapped user name.
323 */
324 if(map_username(service))
325 phome_dir = get_user_home_dir(
326 talloc_tos(), service);
327 }
328
329 DEBUG(3,("checking for home directory %s gave %s\n",service,
330 phome_dir?phome_dir:"(NULL)"));
331
332 iService = add_home_service(service,service /* 'username' */, phome_dir);
333 }
334
335 /* If we still don't have a service, attempt to add it as a printer. */
336 if (iService < 0) {
337 int iPrinterService;
338
339 if ((iPrinterService = lp_servicenumber(PRINTERS_NAME)) < 0) {
340 iPrinterService = load_registry_service(PRINTERS_NAME);
341 }
342 if (iPrinterService >= 0) {
343 DEBUG(3,("checking whether %s is a valid printer name...\n", service));
344 if (pcap_printername_ok(service)) {
345 DEBUG(3,("%s is a valid printer name\n", service));
346 DEBUG(3,("adding %s as a printer service\n", service));
347 lp_add_printer(service, iPrinterService);
348 iService = lp_servicenumber(service);
349 if (iService < 0) {
350 DEBUG(0,("failed to add %s as a printer service!\n", service));
351 }
352 } else {
353 DEBUG(3,("%s is not a valid printer name\n", service));
354 }
355 }
356 }
357
358 /* Check for default vfs service? Unsure whether to implement this */
359 if (iService < 0) {
360 }
361
362 if (iService < 0) {
363 iService = load_registry_service(service);
364 }
365
366 /* Is it a usershare service ? */
367 if (iService < 0 && *lp_usershare_path()) {
368 /* Ensure the name is canonicalized. */
369 strlower_m(service);
370 iService = load_usershare_service(service);
371 }
372
373 /* just possibly it's a default service? */
374 if (iService < 0) {
375 char *pdefservice = lp_defaultservice();
376 if (pdefservice && *pdefservice && !strequal(pdefservice,service) && !strstr_m(service,"..")) {
377 /*
378 * We need to do a local copy here as lp_defaultservice()
379 * returns one of the rotating lp_string buffers that
380 * could get overwritten by the recursive find_service() call
381 * below. Fix from Josef Hinteregger <joehtg@joehtg.co.at>.
382 */
383 char *defservice = SMB_STRDUP(pdefservice);
384
385 if (!defservice) {
386 goto fail;
387 }
388
389 /* Disallow anything except explicit share names. */
390 if (strequal(defservice,HOMES_NAME) ||
391 strequal(defservice, PRINTERS_NAME) ||
392 strequal(defservice, "IPC$")) {
393 SAFE_FREE(defservice);
394 goto fail;
395 }
396
397 iService = find_service(defservice);
398 if (iService >= 0) {
399 all_string_sub(service, "_","/",0);
400 iService = lp_add_service(service, iService);
401 }
402 SAFE_FREE(defservice);
403 }
404 }
405
406 if (iService >= 0) {
407 if (!VALID_SNUM(iService)) {
408 DEBUG(0,("Invalid snum %d for %s\n",iService, service));
409 iService = -1;
410 }
411 }
412
413 fail:
414
415 if (iService < 0)
416 DEBUG(3,("find_service() failed to find service %s\n", service));
417
418 return (iService);
419 }
420
421
422 /****************************************************************************
423 do some basic sainity checks on the share.
424 This function modifies dev, ecode.
425 ****************************************************************************/
426
427 static NTSTATUS share_sanity_checks(struct client_address *client_id, int snum,
428 fstring dev)
429 {
430 if (!lp_snum_ok(snum) ||
431 !allow_access(lp_hostsdeny(snum), lp_hostsallow(snum),
432 client_id->name, client_id->addr)) {
433 return NT_STATUS_ACCESS_DENIED;
434 }
435
436 if (dev[0] == '?' || !dev[0]) {
437 if (lp_print_ok(snum)) {
438 fstrcpy(dev,"LPT1:");
439 } else if (strequal(lp_fstype(snum), "IPC")) {
440 fstrcpy(dev, "IPC");
441 } else {
442 fstrcpy(dev,"A:");
443 }
444 }
445
446 strupper_m(dev);
447
448 if (lp_print_ok(snum)) {
449 if (!strequal(dev, "LPT1:")) {
450 return NT_STATUS_BAD_DEVICE_TYPE;
451 }
452 } else if (strequal(lp_fstype(snum), "IPC")) {
453 if (!strequal(dev, "IPC")) {
454 return NT_STATUS_BAD_DEVICE_TYPE;
455 }
456 } else if (!strequal(dev, "A:")) {
457 return NT_STATUS_BAD_DEVICE_TYPE;
458 }
459
460 /* Behave as a printer if we are supposed to */
461 if (lp_print_ok(snum) && (strcmp(dev, "A:") == 0)) {
462 fstrcpy(dev, "LPT1:");
463 }
464
465 return NT_STATUS_OK;
466 }
467
468 /*
469 * Go through lookup_name etc to find the force'd group.
470 *
471 * Create a new token from src_token, replacing the primary group sid with the
472 * one found.
473 */
474
475 static NTSTATUS find_forced_group(bool force_user,
476 int snum, const char *username,
477 struct dom_sid *pgroup_sid,
478 gid_t *pgid)
479 {
480 NTSTATUS result = NT_STATUS_NO_SUCH_GROUP;
481 TALLOC_CTX *frame = talloc_stackframe();
482 struct dom_sid group_sid;
483 enum lsa_SidType type;
484 char *groupname;
485 bool user_must_be_member = False;
486 gid_t gid;
487
488 groupname = talloc_strdup(talloc_tos(), lp_force_group(snum));
489 if (groupname == NULL) {
490 DEBUG(1, ("talloc_strdup failed\n"));
491 result = NT_STATUS_NO_MEMORY;
492 goto done;
493 }
494
495 if (groupname[0] == '+') {
496 user_must_be_member = True;
497 groupname += 1;
498 }
499
500 groupname = talloc_string_sub(talloc_tos(), groupname,
501 "%S", lp_servicename(snum));
502 if (groupname == NULL) {
503 DEBUG(1, ("talloc_string_sub failed\n"));
504 result = NT_STATUS_NO_MEMORY;
505 goto done;
506 }
507
508 if (!lookup_name_smbconf(talloc_tos(), groupname,
509 LOOKUP_NAME_ALL|LOOKUP_NAME_GROUP,
510 NULL, NULL, &group_sid, &type)) {
511 DEBUG(10, ("lookup_name_smbconf(%s) failed\n",
512 groupname));
513 goto done;
514 }
515
516 if ((type != SID_NAME_DOM_GRP) && (type != SID_NAME_ALIAS) &&
517 (type != SID_NAME_WKN_GRP)) {
518 DEBUG(10, ("%s is a %s, not a group\n", groupname,
519 sid_type_lookup(type)));
520 goto done;
521 }
522
523 if (!sid_to_gid(&group_sid, &gid)) {
524 DEBUG(10, ("sid_to_gid(%s) for %s failed\n",
525 sid_string_dbg(&group_sid), groupname));
526 goto done;
527 }
528
529 /*
530 * If the user has been forced and the forced group starts with a '+',
531 * then we only set the group to be the forced group if the forced
532 * user is a member of that group. Otherwise, the meaning of the '+'
533 * would be ignored.
534 */
535
536 if (force_user && user_must_be_member) {
537 if (user_in_group_sid(username, &group_sid)) {
538 sid_copy(pgroup_sid, &group_sid);
539 *pgid = gid;
540 DEBUG(3,("Forced group %s for member %s\n",
541 groupname, username));
542 } else {
543 DEBUG(0,("find_forced_group: forced user %s is not a member "
544 "of forced group %s. Disallowing access.\n",
545 username, groupname ));
546 result = NT_STATUS_MEMBER_NOT_IN_GROUP;
547 goto done;
548 }
549 } else {
550 sid_copy(pgroup_sid, &group_sid);
551 *pgid = gid;
552 DEBUG(3,("Forced group %s\n", groupname));
553 }
554
555 result = NT_STATUS_OK;
556 done:
557 TALLOC_FREE(frame);
558 return result;
559 }
560
561 /****************************************************************************
562 Create an auth_serversupplied_info structure for a connection_struct
563 ****************************************************************************/
564
565 static NTSTATUS create_connection_server_info(struct smbd_server_connection *sconn,
566 TALLOC_CTX *mem_ctx, int snum,
567 struct auth_serversupplied_info *vuid_serverinfo,
568 DATA_BLOB password,
569 struct auth_serversupplied_info **presult)
570 {
571 if (lp_guest_only(snum)) {
572 return make_server_info_guest(mem_ctx, presult);
573 }
574
575 if (vuid_serverinfo != NULL) {
576
577 struct auth_serversupplied_info *result;
578
579 /*
580 * This is the normal security != share case where we have a
581 * valid vuid from the session setup. */
582
583 if (vuid_serverinfo->guest) {
584 if (!lp_guest_ok(snum)) {
585 DEBUG(2, ("guest user (from session setup) "
586 "not permitted to access this share "
587 "(%s)\n", lp_servicename(snum)));
588 return NT_STATUS_ACCESS_DENIED;
589 }
590 } else {
591 if (!user_ok_token(vuid_serverinfo->unix_name,
592 vuid_serverinfo->info3->base.domain.string,
593 vuid_serverinfo->ptok, snum)) {
594 DEBUG(2, ("user '%s' (from session setup) not "
595 "permitted to access this share "
596 "(%s)\n",
597 vuid_serverinfo->unix_name,
598 lp_servicename(snum)));
599 return NT_STATUS_ACCESS_DENIED;
600 }
601 }
602
603 result = copy_serverinfo(mem_ctx, vuid_serverinfo);
604 if (result == NULL) {
605 return NT_STATUS_NO_MEMORY;
606 }
607
608 *presult = result;
609 return NT_STATUS_OK;
610 }
611
612 if (lp_security() == SEC_SHARE) {
613
614 fstring user;
615 bool guest;
616
617 /* add the sharename as a possible user name if we
618 are in share mode security */
619
620 add_session_user(sconn, lp_servicename(snum));
621
622 /* shall we let them in? */
623
624 if (!authorise_login(sconn, snum,user,password,&guest)) {
625 DEBUG( 2, ( "Invalid username/password for [%s]\n",
626 lp_servicename(snum)) );
627 return NT_STATUS_WRONG_PASSWORD;
628 }
629
630 return make_serverinfo_from_username(mem_ctx, user, guest,
631 presult);
632 }
633
634 DEBUG(0, ("invalid VUID (vuser) but not in security=share\n"));
635 return NT_STATUS_ACCESS_DENIED;
636 }
637
638
639 /****************************************************************************
640 Make a connection, given the snum to connect to, and the vuser of the
641 connecting user if appropriate.
642 ****************************************************************************/
643
644 connection_struct *make_connection_snum(struct smbd_server_connection *sconn,
645 int snum, user_struct *vuser,
646 DATA_BLOB password,
647 const char *pdev,
648 NTSTATUS *pstatus)
649 {
650 connection_struct *conn = NULL;
651 struct smb_filename *smb_fname_cpath = NULL;
652 fstring dev;
653 int ret;
654 bool on_err_call_dis_hook = false;
655 bool claimed_connection = false;
656 uid_t effuid;
657 gid_t effgid;
658 NTSTATUS status;
659
660 fstrcpy(dev, pdev);
661
662 *pstatus = share_sanity_checks(&sconn->client_id, snum, dev);
663 if (NT_STATUS_IS_ERR(*pstatus)) {
664 goto err_root_exit;
665 }
666
667 conn = conn_new(sconn);
668 if (!conn) {
669 DEBUG(0,("Couldn't find free connection.\n"));
670 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
671 goto err_root_exit;
672 }
673
674 conn->params->service = snum;
675
676 status = create_connection_server_info(sconn,
677 conn, snum, vuser ? vuser->server_info : NULL, password,
678 &conn->server_info);
679
680 if (!NT_STATUS_IS_OK(status)) {
681 DEBUG(1, ("create_connection_server_info failed: %s\n",
682 nt_errstr(status)));
683 *pstatus = status;
684 goto err_root_exit;
685 }
686
687 if ((lp_guest_only(snum)) || (lp_security() == SEC_SHARE)) {
688 conn->force_user = true;
689 }
690
691 add_session_user(sconn, conn->server_info->unix_name);
692
693 conn->num_files_open = 0;
694 conn->lastused = conn->lastused_count = time(NULL);
695 conn->used = True;
696 conn->printer = (strncmp(dev,"LPT",3) == 0);
697 conn->ipc = ( (strncmp(dev,"IPC",3) == 0) ||
698 ( lp_enable_asu_support() && strequal(dev,"ADMIN$")) );
699
700 /* Case options for the share. */
701 if (lp_casesensitive(snum) == Auto) {
702 /* We will be setting this per packet. Set to be case
703 * insensitive for now. */
704 conn->case_sensitive = False;
705 } else {
706 conn->case_sensitive = (bool)lp_casesensitive(snum);
707 }
708
709 conn->case_preserve = lp_preservecase(snum);
710 conn->short_case_preserve = lp_shortpreservecase(snum);
711
712 conn->encrypt_level = lp_smb_encrypt(snum);
713
714 conn->veto_list = NULL;
715 conn->hide_list = NULL;
716 conn->veto_oplock_list = NULL;
717 conn->aio_write_behind_list = NULL;
718
719 conn->read_only = lp_readonly(SNUM(conn));
720
721 if (*lp_force_user(snum)) {
722
723 /*
724 * Replace conn->server_info with a completely faked up one
725 * from the username we are forced into :-)
726 */
727
728 char *fuser;
729 struct auth_serversupplied_info *forced_serverinfo;
730
731 fuser = talloc_string_sub(conn, lp_force_user(snum), "%S",
732 lp_servicename(snum));
733 if (fuser == NULL) {
734 *pstatus = NT_STATUS_NO_MEMORY;
735 goto err_root_exit;
736 }
737
738 status = make_serverinfo_from_username(
739 conn, fuser, conn->server_info->guest,
740 &forced_serverinfo);
741 if (!NT_STATUS_IS_OK(status)) {
742 *pstatus = status;
743 goto err_root_exit;
744 }
745
746 TALLOC_FREE(conn->server_info);
747 conn->server_info = forced_serverinfo;
748
749 conn->force_user = True;
750 DEBUG(3,("Forced user %s\n", fuser));
751 }
752
753 /*
754 * If force group is true, then override
755 * any groupid stored for the connecting user.
756 */
757
758 if (*lp_force_group(snum)) {
759
760 status = find_forced_group(
761 conn->force_user, snum, conn->server_info->unix_name,
762 &conn->server_info->ptok->sids[1],
763 &conn->server_info->utok.gid);
764
765 if (!NT_STATUS_IS_OK(status)) {
766 *pstatus = status;
767 goto err_root_exit;
768 }
769
770 /*
771 * We need to cache this gid, to use within
772 * change_to_user() separately from the conn->server_info
773 * struct. We only use conn->server_info directly if
774 * "force_user" was set.
775 */
776 conn->force_group_gid = conn->server_info->utok.gid;
777 }
778
779 conn->vuid = (vuser != NULL) ? vuser->vuid : UID_FIELD_INVALID;
780
781 {
782 char *s = talloc_sub_advanced(talloc_tos(),
783 lp_servicename(SNUM(conn)),
784 conn->server_info->unix_name,
785 conn->connectpath,
786 conn->server_info->utok.gid,
787 conn->server_info->sanitized_username,
788 conn->server_info->info3->base.domain.string,
789 lp_pathname(snum));
790 if (!s) {
791 *pstatus = NT_STATUS_NO_MEMORY;
792 goto err_root_exit;
793 }
794
795 if (!set_conn_connectpath(conn,s)) {
796 TALLOC_FREE(s);
797 *pstatus = NT_STATUS_NO_MEMORY;
798 goto err_root_exit;
799 }
800 DEBUG(3,("Connect path is '%s' for service [%s]\n",s,
801 lp_servicename(snum)));
802 TALLOC_FREE(s);
803 }
804
805 /*
806 * New code to check if there's a share security descripter
807 * added from NT server manager. This is done after the
808 * smb.conf checks are done as we need a uid and token. JRA.
809 *
810 */
811
812 {
813 bool can_write = False;
814
815 can_write = share_access_check(conn->server_info->ptok,
816 lp_servicename(snum),
817 FILE_WRITE_DATA);
818
819 if (!can_write) {
820 if (!share_access_check(conn->server_info->ptok,
821 lp_servicename(snum),
822 FILE_READ_DATA)) {
823 /* No access, read or write. */
824 DEBUG(0,("make_connection: connection to %s "
825 "denied due to security "
826 "descriptor.\n",
827 lp_servicename(snum)));
828 *pstatus = NT_STATUS_ACCESS_DENIED;
829 goto err_root_exit;
830 } else {
831 conn->read_only = True;
832 }
833 }
834 }
835 /* Initialise VFS function pointers */
836
837 if (!smbd_vfs_init(conn)) {
838 DEBUG(0, ("vfs_init failed for service %s\n",
839 lp_servicename(snum)));
840 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
841 goto err_root_exit;
842 }
843
844 /* ROOT Activities: */
845 /* explicitly check widelinks here so that we can correctly warn
846 * in the logs. */
847 widelinks_warning(snum);
848
849 /*
850 * Enforce the max connections parameter.
851 */
852
853 if ((lp_max_connections(snum) > 0)
854 && (count_current_connections(lp_servicename(SNUM(conn)), True) >=
855 lp_max_connections(snum))) {
856
857 DEBUG(1, ("Max connections (%d) exceeded for %s\n",
858 lp_max_connections(snum), lp_servicename(snum)));
859 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
860 goto err_root_exit;
861 }
862
863 /*
864 * Get us an entry in the connections db
865 */
866 if (!claim_connection(conn, lp_servicename(snum))) {
867 DEBUG(1, ("Could not store connections entry\n"));
868 *pstatus = NT_STATUS_INTERNAL_DB_ERROR;
869 goto err_root_exit;
870 }
871 claimed_connection = true;
872
873 /* Invoke VFS make connection hook - this must be the first
874 filesystem operation that we do. */
875
876 if (SMB_VFS_CONNECT(conn, lp_servicename(snum),
877 conn->server_info->unix_name) < 0) {
878 DEBUG(0,("make_connection: VFS make connection failed!\n"));
879 *pstatus = NT_STATUS_UNSUCCESSFUL;
880 goto err_root_exit;
881 }
882
883 /* Any error exit after here needs to call the disconnect hook. */
884 on_err_call_dis_hook = true;
885
886 if ((!conn->printer) && (!conn->ipc)) {
887 conn->notify_ctx = notify_init(conn,
888 sconn_server_id(sconn),
889 sconn->msg_ctx,
890 smbd_event_context(),
891 conn);
892 }
893
894 /*
895 * Fix compatibility issue pointed out by Volker.
896 * We pass the conn->connectpath to the preexec
897 * scripts as a parameter, so attempt to canonicalize
898 * it here before calling the preexec scripts.
899 * We ignore errors here, as it is possible that
900 * the conn->connectpath doesn't exist yet and
901 * the preexec scripts will create them.
902 */
903
904 (void)canonicalize_connect_path(conn);
905
906 /* Preexecs are done here as they might make the dir we are to ChDir
907 * to below */
908 /* execute any "root preexec = " line */
909 if (*lp_rootpreexec(snum)) {
910 char *cmd = talloc_sub_advanced(talloc_tos(),
911 lp_servicename(SNUM(conn)),
912 conn->server_info->unix_name,
913 conn->connectpath,
914 conn->server_info->utok.gid,
915 conn->server_info->sanitized_username,
916 conn->server_info->info3->base.domain.string,
917 lp_rootpreexec(snum));
918 DEBUG(5,("cmd=%s\n",cmd));
919 ret = smbrun(cmd,NULL);
920 TALLOC_FREE(cmd);
921 if (ret != 0 && lp_rootpreexec_close(snum)) {
922 DEBUG(1,("root preexec gave %d - failing "
923 "connection\n", ret));
924 *pstatus = NT_STATUS_ACCESS_DENIED;
925 goto err_root_exit;
926 }
927 }
928
929 /* USER Activites: */
930 if (!change_to_user(conn, conn->vuid)) {
931 /* No point continuing if they fail the basic checks */
932 DEBUG(0,("Can't become connected user!\n"));
933 *pstatus = NT_STATUS_LOGON_FAILURE;
934 goto err_root_exit;
935 }
936
937 effuid = geteuid();
938 effgid = getegid();
939
940 /* Remember that a different vuid can connect later without these
941 * checks... */
942
943 /* Preexecs are done here as they might make the dir we are to ChDir
944 * to below */
945
946 /* execute any "preexec = " line */
947 if (*lp_preexec(snum)) {
948 char *cmd = talloc_sub_advanced(talloc_tos(),
949 lp_servicename(SNUM(conn)),
950 conn->server_info->unix_name,
951 conn->connectpath,
952 conn->server_info->utok.gid,
953 conn->server_info->sanitized_username,
954 conn->server_info->info3->base.domain.string,
955 lp_preexec(snum));
956 ret = smbrun(cmd,NULL);
957 TALLOC_FREE(cmd);
958 if (ret != 0 && lp_preexec_close(snum)) {
959 DEBUG(1,("preexec gave %d - failing connection\n",
960 ret));
961 *pstatus = NT_STATUS_ACCESS_DENIED;
962 goto err_root_exit;
963 }
964 }
965
966 #ifdef WITH_FAKE_KASERVER
967 if (lp_afs_share(snum)) {
968 afs_login(conn);
969 }
970 #endif
971
972 /*
973 * we've finished with the user stuff - go back to root
974 * so the SMB_VFS_STAT call will only fail on path errors,
975 * not permission problems.
976 */
977 change_to_root_user();
978 /* ROOT Activites: */
979
980 /*
981 * If widelinks are disallowed we need to canonicalise the connect
982 * path here to ensure we don't have any symlinks in the
983 * connectpath. We will be checking all paths on this connection are
984 * below this directory. We must do this after the VFS init as we
985 * depend on the realpath() pointer in the vfs table. JRA.
986 */
987 if (!lp_widelinks(snum)) {
988 if (!canonicalize_connect_path(conn)) {
989 DEBUG(0, ("canonicalize_connect_path failed "
990 "for service %s, path %s\n",
991 lp_servicename(snum),
992 conn->connectpath));
993 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
994 goto err_root_exit;
995 }
996 }
997
998 /* Add veto/hide lists */
999 if (!IS_IPC(conn) && !IS_PRINT(conn)) {
1000 set_namearray( &conn->veto_list, lp_veto_files(snum));
1001 set_namearray( &conn->hide_list, lp_hide_files(snum));
1002 set_namearray( &conn->veto_oplock_list, lp_veto_oplocks(snum));
1003 set_namearray( &conn->aio_write_behind_list,
1004 lp_aio_write_behind(snum));
1005 }
1006 status = create_synthetic_smb_fname(talloc_tos(), conn->connectpath,
1007 NULL, NULL, &smb_fname_cpath);
1008 if (!NT_STATUS_IS_OK(status)) {
1009 *pstatus = status;
1010 goto err_root_exit;
1011 }
1012
1013 /* win2000 does not check the permissions on the directory
1014 during the tree connect, instead relying on permission
1015 check during individual operations. To match this behaviour
1016 I have disabled this chdir check (tridge) */
1017 /* the alternative is just to check the directory exists */
1018
1019 if ((ret = SMB_VFS_STAT(conn, smb_fname_cpath)) != 0 ||
1020 !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
1021 if (ret == 0 && !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
1022 DEBUG(0,("'%s' is not a directory, when connecting to "
1023 "[%s]\n", conn->connectpath,
1024 lp_servicename(snum)));
1025 } else {
1026 DEBUG(0,("'%s' does not exist or permission denied "
1027 "when connecting to [%s] Error was %s\n",
1028 conn->connectpath, lp_servicename(snum),
1029 strerror(errno) ));
1030 }
1031 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
1032 goto err_root_exit;
1033 }
1034 conn->base_share_dev = smb_fname_cpath->st.st_ex_dev;
1035
1036 string_set(&conn->origpath,conn->connectpath);
1037
1038 /* Figure out the characteristics of the underlying filesystem. This
1039 * assumes that all the filesystem mounted withing a share path have
1040 * the same characteristics, which is likely but not guaranteed.
1041 */
1042
1043 conn->fs_capabilities = SMB_VFS_FS_CAPABILITIES(conn, &conn->ts_res);
1044
1045 /*
1046 * Print out the 'connected as' stuff here as we need
1047 * to know the effective uid and gid we will be using
1048 * (at least initially).
1049 */
1050
1051 if( DEBUGLVL( IS_IPC(conn) ? 3 : 1 ) ) {
1052 dbgtext( "%s (%s) ", get_remote_machine_name(),
1053 conn->sconn->client_id.addr );
1054 dbgtext( "%s", srv_is_signing_active(sconn) ? "signed " : "");
1055 dbgtext( "connect to service %s ", lp_servicename(snum) );
1056 dbgtext( "initially as user %s ",
1057 conn->server_info->unix_name );
1058 dbgtext( "(uid=%d, gid=%d) ", (int)effuid, (int)effgid );
1059 dbgtext( "(pid %d)\n", (int)sys_getpid() );
1060 }
1061
1062 return(conn);
1063
1064 err_root_exit:
1065 TALLOC_FREE(smb_fname_cpath);
1066 /* We must exit this function as root. */
1067 if (geteuid() != 0) {
1068 change_to_root_user();
1069 }
1070 if (on_err_call_dis_hook) {
1071 /* Call VFS disconnect hook */
1072 SMB_VFS_DISCONNECT(conn);
1073 }
1074 if (claimed_connection) {
1075 yield_connection(conn, lp_servicename(snum));
1076 }
1077 if (conn) {
1078 conn_free(conn);
1079 }
1080 return NULL;
1081 }
1082
1083 /****************************************************************************
1084 Make a connection to a service.
1085 *
1086 * @param service
1087 ****************************************************************************/
1088
1089 connection_struct *make_connection(struct smbd_server_connection *sconn,
1090 const char *service_in, DATA_BLOB password,
1091 const char *pdev, uint16 vuid,
1092 NTSTATUS *status)
1093 {
1094 uid_t euid;
1095 user_struct *vuser = NULL;
1096 fstring service;
1097 fstring dev;
1098 int snum = -1;
1099
1100 fstrcpy(dev, pdev);
1101
1102 /* This must ONLY BE CALLED AS ROOT. As it exits this function as
1103 * root. */
1104 if (!non_root_mode() && (euid = geteuid()) != 0) {
1105 DEBUG(0,("make_connection: PANIC ERROR. Called as nonroot "
1106 "(%u)\n", (unsigned int)euid ));
1107 smb_panic("make_connection: PANIC ERROR. Called as nonroot\n");
1108 }
1109
1110 if (conn_num_open(sconn) > 2047) {
1111 *status = NT_STATUS_INSUFF_SERVER_RESOURCES;
1112 return NULL;
1113 }
1114
1115 if(lp_security() != SEC_SHARE) {
1116 vuser = get_valid_user_struct(sconn, vuid);
1117 if (!vuser) {
1118 DEBUG(1,("make_connection: refusing to connect with "
1119 "no session setup\n"));
1120 *status = NT_STATUS_ACCESS_DENIED;
1121 return NULL;
1122 }
1123 }
1124
1125 /* Logic to try and connect to the correct [homes] share, preferably
1126 without too many getpwnam() lookups. This is particulary nasty for
1127 winbind usernames, where the share name isn't the same as unix
1128 username.
1129
1130 The snum of the homes share is stored on the vuser at session setup
1131 time.
1132 */
1133
1134 if (strequal(service_in,HOMES_NAME)) {
1135 if(lp_security() != SEC_SHARE) {
1136 DATA_BLOB no_pw = data_blob_null;
1137 if (vuser->homes_snum == -1) {
1138 DEBUG(2, ("[homes] share not available for "
1139 "this user because it was not found "
1140 "or created at session setup "
1141 "time\n"));
1142 *status = NT_STATUS_BAD_NETWORK_NAME;
1143 return NULL;
1144 }
1145 DEBUG(5, ("making a connection to [homes] service "
1146 "created at session setup time\n"));
1147 return make_connection_snum(sconn,
1148 vuser->homes_snum,
1149 vuser, no_pw,
1150 dev, status);
1151 } else {
1152 /* Security = share. Try with
1153 * current_user_info.smb_name as the username. */
1154 if (*current_user_info.smb_name) {
1155 fstring unix_username;
1156 fstrcpy(unix_username,
1157 current_user_info.smb_name);
1158 map_username(unix_username);
1159 snum = find_service(unix_username);
1160 }
1161 if (snum != -1) {
1162 DEBUG(5, ("making a connection to 'homes' "
1163 "service %s based on "
1164 "security=share\n", service_in));
1165 return make_connection_snum(sconn,
1166 snum, NULL,
1167 password,
1168 dev, status);
1169 }
1170 }
1171 } else if ((lp_security() != SEC_SHARE) && (vuser->homes_snum != -1)
1172 && strequal(service_in,
1173 lp_servicename(vuser->homes_snum))) {
1174 DATA_BLOB no_pw = data_blob_null;
1175 DEBUG(5, ("making a connection to 'homes' service [%s] "
1176 "created at session setup time\n", service_in));
1177 return make_connection_snum(sconn,
1178 vuser->homes_snum,
1179 vuser, no_pw,
1180 dev, status);
1181 }
1182
1183 fstrcpy(service, service_in);
1184
1185 strlower_m(service);
1186
1187 snum = find_service(service);
1188
1189 if (snum < 0) {
1190 if (strequal(service,"IPC$") ||
1191 (lp_enable_asu_support() && strequal(service,"ADMIN$"))) {
1192 DEBUG(3,("refusing IPC connection to %s\n", service));
1193 *status = NT_STATUS_ACCESS_DENIED;
1194 return NULL;
1195 }
1196
1197 DEBUG(3,("%s (%s) couldn't find service %s\n",
1198 get_remote_machine_name(),
1199 tsocket_address_string(
1200 sconn->remote_address, talloc_tos()),
1201 service));
1202 *status = NT_STATUS_BAD_NETWORK_NAME;
1203 return NULL;
1204 }
1205
1206 /* Handle non-Dfs clients attempting connections to msdfs proxy */
1207 if (lp_host_msdfs() && (*lp_msdfs_proxy(snum) != '\0')) {
1208 DEBUG(3, ("refusing connection to dfs proxy share '%s' "
1209 "(pointing to %s)\n",
1210 service, lp_msdfs_proxy(snum)));
1211 *status = NT_STATUS_BAD_NETWORK_NAME;
1212 return NULL;
1213 }
1214
1215 DEBUG(5, ("making a connection to 'normal' service %s\n", service));
1216
1217 return make_connection_snum(sconn, snum, vuser,
1218 password,
1219 dev, status);
1220 }
1221
1222 /****************************************************************************
1223 Close a cnum.
1224 ****************************************************************************/
1225
1226 void close_cnum(connection_struct *conn, uint16 vuid)
1227 {
1228 file_close_conn(conn);
1229
1230 if (!IS_IPC(conn)) {
1231 dptr_closecnum(conn);
1232 }
1233
1234 change_to_root_user();
1235
1236 DEBUG(IS_IPC(conn)?3:1, ("%s (%s) closed connection to service %s\n",
1237 get_remote_machine_name(),
1238 conn->sconn->client_id.addr,
1239 lp_servicename(SNUM(conn))));
1240
1241 /* Call VFS disconnect hook */
1242 SMB_VFS_DISCONNECT(conn);
1243
1244 yield_connection(conn, lp_servicename(SNUM(conn)));
1245
1246 /* make sure we leave the directory available for unmount */
1247 vfs_ChDir(conn, "/");
1248
1249 /* execute any "postexec = " line */
1250 if (*lp_postexec(SNUM(conn)) &&
1251 change_to_user(conn, vuid)) {
1252 char *cmd = talloc_sub_advanced(talloc_tos(),
1253 lp_servicename(SNUM(conn)),
1254 conn->server_info->unix_name,
1255 conn->connectpath,
1256 conn->server_info->utok.gid,
1257 conn->server_info->sanitized_username,
1258 conn->server_info->info3->base.domain.string,
1259 lp_postexec(SNUM(conn)));
1260 smbrun(cmd,NULL);
1261 TALLOC_FREE(cmd);
1262 change_to_root_user();
1263 }
1264
1265 change_to_root_user();
1266 /* execute any "root postexec = " line */
1267 if (*lp_rootpostexec(SNUM(conn))) {
1268 char *cmd = talloc_sub_advanced(talloc_tos(),
1269 lp_servicename(SNUM(conn)),
1270 conn->server_info->unix_name,
1271 conn->connectpath,
1272 conn->server_info->utok.gid,
1273 conn->server_info->sanitized_username,
1274 conn->server_info->info3->base.domain.string,
1275 lp_rootpostexec(SNUM(conn)));
1276 smbrun(cmd,NULL);
1277 TALLOC_FREE(cmd);
1278 }
1279
1280 conn_free(conn);
1281 }
reg import