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s4-netlogon: implement dcesrv_netr_DsRAddressToSitenamesExW
[Samba/aatanasov.git] / source3 / smbd / service.c
blob3520f0d411becbf0bef70ecaf939613f097ee7c9
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
23 extern userdom_struct current_user_info;
24
25 static bool canonicalize_connect_path(connection_struct *conn)
26 {
27 #ifdef REALPATH_TAKES_NULL
28 bool ret;
29 char *resolved_name = SMB_VFS_REALPATH(conn,conn->connectpath,NULL);
30 if (!resolved_name) {
31 return false;
32 }
33 ret = set_conn_connectpath(conn,resolved_name);
34 SAFE_FREE(resolved_name);
35 return ret;
36 #else
37 char resolved_name_buf[PATH_MAX+1];
38 char *resolved_name = SMB_VFS_REALPATH(conn,conn->connectpath,resolved_name_buf);
39 if (!resolved_name) {
40 return false;
41 }
42 return set_conn_connectpath(conn,resolved_name);
43 #endif /* REALPATH_TAKES_NULL */
44 }
45
46 /****************************************************************************
47 Ensure when setting connectpath it is a canonicalized (no ./ // or ../)
48 absolute path stating in / and not ending in /.
49 Observent people will notice a similarity between this and check_path_syntax :-).
50 ****************************************************************************/
51
52 bool set_conn_connectpath(connection_struct *conn, const char *connectpath)
53 {
54 char *destname;
55 char *d;
56 const char *s = connectpath;
57 bool start_of_name_component = true;
58
59 destname = SMB_STRDUP(connectpath);
60 if (!destname) {
61 return false;
62 }
63 d = destname;
64
65 *d++ = '/'; /* Always start with root. */
66
67 while (*s) {
68 if (*s == '/') {
69 /* Eat multiple '/' */
70 while (*s == '/') {
71 s++;
72 }
73 if ((d > destname + 1) && (*s != '\0')) {
74 *d++ = '/';
75 }
76 start_of_name_component = True;
77 continue;
78 }
79
80 if (start_of_name_component) {
81 if ((s[0] == '.') && (s[1] == '.') && (s[2] == '/' || s[2] == '\0')) {
82 /* Uh oh - "/../" or "/..\0" ! */
83
84 /* Go past the ../ or .. */
85 if (s[2] == '/') {
86 s += 3;
87 } else {
88 s += 2; /* Go past the .. */
89 }
90
91 /* If we just added a '/' - delete it */
92 if ((d > destname) && (*(d-1) == '/')) {
93 *(d-1) = '\0';
94 d--;
95 }
96
97 /* Are we at the start ? Can't go back further if so. */
98 if (d <= destname) {
99 *d++ = '/'; /* Can't delete root */
100 continue;
101 }
102 /* Go back one level... */
103 /* Decrement d first as d points to the *next* char to write into. */
104 for (d--; d > destname; d--) {
105 if (*d == '/') {
106 break;
107 }
108 }
109 /* We're still at the start of a name component, just the previous one. */
110 continue;
111 } else if ((s[0] == '.') && ((s[1] == '\0') || s[1] == '/')) {
112 /* Component of pathname can't be "." only - skip the '.' . */
113 if (s[1] == '/') {
114 s += 2;
115 } else {
116 s++;
117 }
118 continue;
119 }
120 }
121
122 if (!(*s & 0x80)) {
123 *d++ = *s++;
124 } else {
125 size_t siz;
126 /* Get the size of the next MB character. */
127 next_codepoint(s,&siz);
128 switch(siz) {
129 case 5:
130 *d++ = *s++;
131 /*fall through*/
132 case 4:
133 *d++ = *s++;
134 /*fall through*/
135 case 3:
136 *d++ = *s++;
137 /*fall through*/
138 case 2:
139 *d++ = *s++;
140 /*fall through*/
141 case 1:
142 *d++ = *s++;
143 break;
144 default:
145 break;
146 }
147 }
148 start_of_name_component = false;
149 }
150 *d = '\0';
151
152 /* And must not end in '/' */
153 if (d > destname + 1 && (*(d-1) == '/')) {
154 *(d-1) = '\0';
155 }
156
157 DEBUG(10,("set_conn_connectpath: service %s, connectpath = %s\n",
158 lp_servicename(SNUM(conn)), destname ));
159
160 string_set(&conn->connectpath, destname);
161 SAFE_FREE(destname);
162 return true;
163 }
164
165 /****************************************************************************
166 Load parameters specific to a connection/service.
167 ****************************************************************************/
168
169 bool set_current_service(connection_struct *conn, uint16 flags, bool do_chdir)
170 {
171 int snum;
172
173 if (!conn) {
174 last_conn = NULL;
175 return(False);
176 }
177
178 conn->lastused_count++;
179
180 snum = SNUM(conn);
181
182 if (do_chdir &&
183 vfs_ChDir(conn,conn->connectpath) != 0 &&
184 vfs_ChDir(conn,conn->origpath) != 0) {
185 DEBUG(((errno!=EACCES)?0:3),("chdir (%s) failed, reason: %s\n",
186 conn->connectpath, strerror(errno)));
187 return(False);
188 }
189
190 if ((conn == last_conn) && (last_flags == flags)) {
191 return(True);
192 }
193
194 last_conn = conn;
195 last_flags = flags;
196
197 /* Obey the client case sensitivity requests - only for clients that support it. */
198 switch (lp_casesensitive(snum)) {
199 case Auto:
200 {
201 /* We need this uglyness due to DOS/Win9x clients that lie about case insensitivity. */
202 enum remote_arch_types ra_type = get_remote_arch();
203 if ((ra_type != RA_SAMBA) && (ra_type != RA_CIFSFS)) {
204 /* Client can't support per-packet case sensitive pathnames. */
205 conn->case_sensitive = False;
206 } else {
207 conn->case_sensitive = !(flags & FLAG_CASELESS_PATHNAMES);
208 }
209 }
210 break;
211 case True:
212 conn->case_sensitive = True;
213 break;
214 default:
215 conn->case_sensitive = False;
216 break;
217 }
218 return(True);
219 }
220
221 static int load_registry_service(const char *servicename)
222 {
223 if (!lp_registry_shares()) {
224 return -1;
225 }
226
227 if ((servicename == NULL) || (*servicename == '\0')) {
228 return -1;
229 }
230
231 if (strequal(servicename, GLOBAL_NAME)) {
232 return -2;
233 }
234
235 if (!process_registry_service(servicename)) {
236 return -1;
237 }
238
239 return lp_servicenumber(servicename);
240 }
241
242 void load_registry_shares(void)
243 {
244 DEBUG(8, ("load_registry_shares()\n"));
245 if (!lp_registry_shares()) {
246 return;
247 }
248
249 process_registry_shares();
250
251 return;
252 }
253
254 /****************************************************************************
255 Add a home service. Returns the new service number or -1 if fail.
256 ****************************************************************************/
257
258 int add_home_service(const char *service, const char *username, const char *homedir)
259 {
260 int iHomeService;
261
262 if (!service || !homedir)
263 return -1;
264
265 if ((iHomeService = lp_servicenumber(HOMES_NAME)) < 0) {
266 if ((iHomeService = load_registry_service(HOMES_NAME)) < 0) {
267 return -1;
268 }
269 }
270
271 /*
272 * If this is a winbindd provided username, remove
273 * the domain component before adding the service.
274 * Log a warning if the "path=" parameter does not
275 * include any macros.
276 */
277
278 {
279 const char *p = strchr(service,*lp_winbind_separator());
280
281 /* We only want the 'user' part of the string */
282 if (p) {
283 service = p + 1;
284 }
285 }
286
287 if (!lp_add_home(service, iHomeService, username, homedir)) {
288 return -1;
289 }
290
291 return lp_servicenumber(service);
292
293 }
294
295 /**
296 * Find a service entry.
297 *
298 * @param service is modified (to canonical form??)
299 **/
300
301 int find_service(fstring service)
302 {
303 int iService;
304 struct smbd_server_connection *sconn = smbd_server_conn;
305
306 all_string_sub(service,"\\","/",0);
307
308 iService = lp_servicenumber(service);
309
310 /* now handle the special case of a home directory */
311 if (iService < 0) {
312 char *phome_dir = get_user_home_dir(talloc_tos(), service);
313
314 if(!phome_dir) {
315 /*
316 * Try mapping the servicename, it may
317 * be a Windows to unix mapped user name.
318 */
319 if(map_username(sconn, service))
320 phome_dir = get_user_home_dir(
321 talloc_tos(), service);
322 }
323
324 DEBUG(3,("checking for home directory %s gave %s\n",service,
325 phome_dir?phome_dir:"(NULL)"));
326
327 iService = add_home_service(service,service /* 'username' */, phome_dir);
328 }
329
330 /* If we still don't have a service, attempt to add it as a printer. */
331 if (iService < 0) {
332 int iPrinterService;
333
334 if ((iPrinterService = lp_servicenumber(PRINTERS_NAME)) < 0) {
335 iPrinterService = load_registry_service(PRINTERS_NAME);
336 }
337 if (iPrinterService) {
338 DEBUG(3,("checking whether %s is a valid printer name...\n", service));
339 if (pcap_printername_ok(service)) {
340 DEBUG(3,("%s is a valid printer name\n", service));
341 DEBUG(3,("adding %s as a printer service\n", service));
342 lp_add_printer(service, iPrinterService);
343 iService = lp_servicenumber(service);
344 if (iService < 0) {
345 DEBUG(0,("failed to add %s as a printer service!\n", service));
346 }
347 } else {
348 DEBUG(3,("%s is not a valid printer name\n", service));
349 }
350 }
351 }
352
353 /* Check for default vfs service? Unsure whether to implement this */
354 if (iService < 0) {
355 }
356
357 if (iService < 0) {
358 iService = load_registry_service(service);
359 }
360
361 /* Is it a usershare service ? */
362 if (iService < 0 && *lp_usershare_path()) {
363 /* Ensure the name is canonicalized. */
364 strlower_m(service);
365 iService = load_usershare_service(service);
366 }
367
368 /* just possibly it's a default service? */
369 if (iService < 0) {
370 char *pdefservice = lp_defaultservice();
371 if (pdefservice && *pdefservice && !strequal(pdefservice,service) && !strstr_m(service,"..")) {
372 /*
373 * We need to do a local copy here as lp_defaultservice()
374 * returns one of the rotating lp_string buffers that
375 * could get overwritten by the recursive find_service() call
376 * below. Fix from Josef Hinteregger <joehtg@joehtg.co.at>.
377 */
378 char *defservice = SMB_STRDUP(pdefservice);
379
380 if (!defservice) {
381 goto fail;
382 }
383
384 /* Disallow anything except explicit share names. */
385 if (strequal(defservice,HOMES_NAME) ||
386 strequal(defservice, PRINTERS_NAME) ||
387 strequal(defservice, "IPC$")) {
388 SAFE_FREE(defservice);
389 goto fail;
390 }
391
392 iService = find_service(defservice);
393 if (iService >= 0) {
394 all_string_sub(service, "_","/",0);
395 iService = lp_add_service(service, iService);
396 }
397 SAFE_FREE(defservice);
398 }
399 }
400
401 if (iService >= 0) {
402 if (!VALID_SNUM(iService)) {
403 DEBUG(0,("Invalid snum %d for %s\n",iService, service));
404 iService = -1;
405 }
406 }
407
408 fail:
409
410 if (iService < 0)
411 DEBUG(3,("find_service() failed to find service %s\n", service));
412
413 return (iService);
414 }
415
416
417 /****************************************************************************
418 do some basic sainity checks on the share.
419 This function modifies dev, ecode.
420 ****************************************************************************/
421
422 static NTSTATUS share_sanity_checks(int snum, fstring dev)
423 {
424
425 if (!lp_snum_ok(snum) ||
426 !check_access(smbd_server_fd(),
427 lp_hostsallow(snum), lp_hostsdeny(snum))) {
428 return NT_STATUS_ACCESS_DENIED;
429 }
430
431 if (dev[0] == '?' || !dev[0]) {
432 if (lp_print_ok(snum)) {
433 fstrcpy(dev,"LPT1:");
434 } else if (strequal(lp_fstype(snum), "IPC")) {
435 fstrcpy(dev, "IPC");
436 } else {
437 fstrcpy(dev,"A:");
438 }
439 }
440
441 strupper_m(dev);
442
443 if (lp_print_ok(snum)) {
444 if (!strequal(dev, "LPT1:")) {
445 return NT_STATUS_BAD_DEVICE_TYPE;
446 }
447 } else if (strequal(lp_fstype(snum), "IPC")) {
448 if (!strequal(dev, "IPC")) {
449 return NT_STATUS_BAD_DEVICE_TYPE;
450 }
451 } else if (!strequal(dev, "A:")) {
452 return NT_STATUS_BAD_DEVICE_TYPE;
453 }
454
455 /* Behave as a printer if we are supposed to */
456 if (lp_print_ok(snum) && (strcmp(dev, "A:") == 0)) {
457 fstrcpy(dev, "LPT1:");
458 }
459
460 return NT_STATUS_OK;
461 }
462
463 /*
464 * Go through lookup_name etc to find the force'd group.
465 *
466 * Create a new token from src_token, replacing the primary group sid with the
467 * one found.
468 */
469
470 static NTSTATUS find_forced_group(bool force_user,
471 int snum, const char *username,
472 DOM_SID *pgroup_sid,
473 gid_t *pgid)
474 {
475 NTSTATUS result = NT_STATUS_NO_SUCH_GROUP;
476 TALLOC_CTX *frame = talloc_stackframe();
477 DOM_SID group_sid;
478 enum lsa_SidType type;
479 char *groupname;
480 bool user_must_be_member = False;
481 gid_t gid;
482
483 groupname = talloc_strdup(talloc_tos(), lp_force_group(snum));
484 if (groupname == NULL) {
485 DEBUG(1, ("talloc_strdup failed\n"));
486 result = NT_STATUS_NO_MEMORY;
487 goto done;
488 }
489
490 if (groupname[0] == '+') {
491 user_must_be_member = True;
492 groupname += 1;
493 }
494
495 groupname = talloc_string_sub(talloc_tos(), groupname,
496 "%S", lp_servicename(snum));
497 if (groupname == NULL) {
498 DEBUG(1, ("talloc_string_sub failed\n"));
499 result = NT_STATUS_NO_MEMORY;
500 goto done;
501 }
502
503 if (!lookup_name_smbconf(talloc_tos(), groupname,
504 LOOKUP_NAME_ALL|LOOKUP_NAME_GROUP,
505 NULL, NULL, &group_sid, &type)) {
506 DEBUG(10, ("lookup_name_smbconf(%s) failed\n",
507 groupname));
508 goto done;
509 }
510
511 if ((type != SID_NAME_DOM_GRP) && (type != SID_NAME_ALIAS) &&
512 (type != SID_NAME_WKN_GRP)) {
513 DEBUG(10, ("%s is a %s, not a group\n", groupname,
514 sid_type_lookup(type)));
515 goto done;
516 }
517
518 if (!sid_to_gid(&group_sid, &gid)) {
519 DEBUG(10, ("sid_to_gid(%s) for %s failed\n",
520 sid_string_dbg(&group_sid), groupname));
521 goto done;
522 }
523
524 /*
525 * If the user has been forced and the forced group starts with a '+',
526 * then we only set the group to be the forced group if the forced
527 * user is a member of that group. Otherwise, the meaning of the '+'
528 * would be ignored.
529 */
530
531 if (force_user && user_must_be_member) {
532 if (user_in_group_sid(username, &group_sid)) {
533 sid_copy(pgroup_sid, &group_sid);
534 *pgid = gid;
535 DEBUG(3,("Forced group %s for member %s\n",
536 groupname, username));
537 } else {
538 DEBUG(0,("find_forced_group: forced user %s is not a member "
539 "of forced group %s. Disallowing access.\n",
540 username, groupname ));
541 result = NT_STATUS_MEMBER_NOT_IN_GROUP;
542 goto done;
543 }
544 } else {
545 sid_copy(pgroup_sid, &group_sid);
546 *pgid = gid;
547 DEBUG(3,("Forced group %s\n", groupname));
548 }
549
550 result = NT_STATUS_OK;
551 done:
552 TALLOC_FREE(frame);
553 return result;
554 }
555
556 /****************************************************************************
557 Create an auth_serversupplied_info structure for a connection_struct
558 ****************************************************************************/
559
560 static NTSTATUS create_connection_server_info(struct smbd_server_connection *sconn,
561 TALLOC_CTX *mem_ctx, int snum,
562 struct auth_serversupplied_info *vuid_serverinfo,
563 DATA_BLOB password,
564 struct auth_serversupplied_info **presult)
565 {
566 if (lp_guest_only(snum)) {
567 return make_server_info_guest(mem_ctx, presult);
568 }
569
570 if (vuid_serverinfo != NULL) {
571
572 struct auth_serversupplied_info *result;
573
574 /*
575 * This is the normal security != share case where we have a
576 * valid vuid from the session setup. */
577
578 if (vuid_serverinfo->guest) {
579 if (!lp_guest_ok(snum)) {
580 DEBUG(2, ("guest user (from session setup) "
581 "not permitted to access this share "
582 "(%s)\n", lp_servicename(snum)));
583 return NT_STATUS_ACCESS_DENIED;
584 }
585 } else {
586 if (!user_ok_token(vuid_serverinfo->unix_name,
587 pdb_get_domain(vuid_serverinfo->sam_account),
588 vuid_serverinfo->ptok, snum)) {
589 DEBUG(2, ("user '%s' (from session setup) not "
590 "permitted to access this share "
591 "(%s)\n",
592 vuid_serverinfo->unix_name,
593 lp_servicename(snum)));
594 return NT_STATUS_ACCESS_DENIED;
595 }
596 }
597
598 result = copy_serverinfo(mem_ctx, vuid_serverinfo);
599 if (result == NULL) {
600 return NT_STATUS_NO_MEMORY;
601 }
602
603 *presult = result;
604 return NT_STATUS_OK;
605 }
606
607 if (lp_security() == SEC_SHARE) {
608
609 fstring user;
610 bool guest;
611
612 /* add the sharename as a possible user name if we
613 are in share mode security */
614
615 add_session_user(sconn, lp_servicename(snum));
616
617 /* shall we let them in? */
618
619 if (!authorise_login(sconn, snum,user,password,&guest)) {
620 DEBUG( 2, ( "Invalid username/password for [%s]\n",
621 lp_servicename(snum)) );
622 return NT_STATUS_WRONG_PASSWORD;
623 }
624
625 return make_serverinfo_from_username(mem_ctx, user, guest,
626 presult);
627 }
628
629 DEBUG(0, ("invalid VUID (vuser) but not in security=share\n"));
630 return NT_STATUS_ACCESS_DENIED;
631 }
632
633
634 /****************************************************************************
635 Make a connection, given the snum to connect to, and the vuser of the
636 connecting user if appropriate.
637 ****************************************************************************/
638
639 connection_struct *make_connection_snum(struct smbd_server_connection *sconn,
640 int snum, user_struct *vuser,
641 DATA_BLOB password,
642 const char *pdev,
643 NTSTATUS *pstatus)
644 {
645 connection_struct *conn;
646 struct smb_filename *smb_fname_cpath = NULL;
647 fstring dev;
648 int ret;
649 char addr[INET6_ADDRSTRLEN];
650 bool on_err_call_dis_hook = false;
651 NTSTATUS status;
652
653 fstrcpy(dev, pdev);
654
655 if (NT_STATUS_IS_ERR(*pstatus = share_sanity_checks(snum, dev))) {
656 return NULL;
657 }
658
659 conn = conn_new(sconn);
660 if (!conn) {
661 DEBUG(0,("Couldn't find free connection.\n"));
662 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
663 return NULL;
664 }
665
666 conn->params->service = snum;
667
668 status = create_connection_server_info(sconn,
669 conn, snum, vuser ? vuser->server_info : NULL, password,
670 &conn->server_info);
671
672 if (!NT_STATUS_IS_OK(status)) {
673 DEBUG(1, ("create_connection_server_info failed: %s\n",
674 nt_errstr(status)));
675 *pstatus = status;
676 conn_free(conn);
677 return NULL;
678 }
679
680 if ((lp_guest_only(snum)) || (lp_security() == SEC_SHARE)) {
681 conn->force_user = true;
682 }
683
684 add_session_user(sconn, conn->server_info->unix_name);
685
686 safe_strcpy(conn->client_address,
687 client_addr(get_client_fd(),addr,sizeof(addr)),
688 sizeof(conn->client_address)-1);
689 conn->num_files_open = 0;
690 conn->lastused = conn->lastused_count = time(NULL);
691 conn->used = True;
692 conn->printer = (strncmp(dev,"LPT",3) == 0);
693 conn->ipc = ( (strncmp(dev,"IPC",3) == 0) ||
694 ( lp_enable_asu_support() && strequal(dev,"ADMIN$")) );
695
696 /* Case options for the share. */
697 if (lp_casesensitive(snum) == Auto) {
698 /* We will be setting this per packet. Set to be case
699 * insensitive for now. */
700 conn->case_sensitive = False;
701 } else {
702 conn->case_sensitive = (bool)lp_casesensitive(snum);
703 }
704
705 conn->case_preserve = lp_preservecase(snum);
706 conn->short_case_preserve = lp_shortpreservecase(snum);
707
708 conn->encrypt_level = lp_smb_encrypt(snum);
709
710 conn->veto_list = NULL;
711 conn->hide_list = NULL;
712 conn->veto_oplock_list = NULL;
713 conn->aio_write_behind_list = NULL;
714
715 conn->read_only = lp_readonly(SNUM(conn));
716 conn->admin_user = False;
717
718 if (*lp_force_user(snum)) {
719
720 /*
721 * Replace conn->server_info with a completely faked up one
722 * from the username we are forced into :-)
723 */
724
725 char *fuser;
726 struct auth_serversupplied_info *forced_serverinfo;
727
728 fuser = talloc_string_sub(conn, lp_force_user(snum), "%S",
729 lp_servicename(snum));
730 if (fuser == NULL) {
731 conn_free(conn);
732 *pstatus = NT_STATUS_NO_MEMORY;
733 return NULL;
734 }
735
736 status = make_serverinfo_from_username(
737 conn, fuser, conn->server_info->guest,
738 &forced_serverinfo);
739 if (!NT_STATUS_IS_OK(status)) {
740 conn_free(conn);
741 *pstatus = status;
742 return NULL;
743 }
744
745 TALLOC_FREE(conn->server_info);
746 conn->server_info = forced_serverinfo;
747
748 conn->force_user = True;
749 DEBUG(3,("Forced user %s\n", fuser));
750 }
751
752 /*
753 * If force group is true, then override
754 * any groupid stored for the connecting user.
755 */
756
757 if (*lp_force_group(snum)) {
758
759 status = find_forced_group(
760 conn->force_user, snum, conn->server_info->unix_name,
761 &conn->server_info->ptok->user_sids[1],
762 &conn->server_info->utok.gid);
763
764 if (!NT_STATUS_IS_OK(status)) {
765 conn_free(conn);
766 *pstatus = status;
767 return NULL;
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 pdb_get_domain(conn->server_info->sam_account),
789 lp_pathname(snum));
790 if (!s) {
791 conn_free(conn);
792 *pstatus = NT_STATUS_NO_MEMORY;
793 return NULL;
794 }
795
796 if (!set_conn_connectpath(conn,s)) {
797 TALLOC_FREE(s);
798 conn_free(conn);
799 *pstatus = NT_STATUS_NO_MEMORY;
800 return NULL;
801 }
802 DEBUG(3,("Connect path is '%s' for service [%s]\n",s,
803 lp_servicename(snum)));
804 TALLOC_FREE(s);
805 }
806
807 /*
808 * New code to check if there's a share security descripter
809 * added from NT server manager. This is done after the
810 * smb.conf checks are done as we need a uid and token. JRA.
811 *
812 */
813
814 {
815 bool can_write = False;
816
817 can_write = share_access_check(conn->server_info->ptok,
818 lp_servicename(snum),
819 FILE_WRITE_DATA);
820
821 if (!can_write) {
822 if (!share_access_check(conn->server_info->ptok,
823 lp_servicename(snum),
824 FILE_READ_DATA)) {
825 /* No access, read or write. */
826 DEBUG(0,("make_connection: connection to %s "
827 "denied due to security "
828 "descriptor.\n",
829 lp_servicename(snum)));
830 conn_free(conn);
831 *pstatus = NT_STATUS_ACCESS_DENIED;
832 return NULL;
833 } else {
834 conn->read_only = True;
835 }
836 }
837 }
838 /* Initialise VFS function pointers */
839
840 if (!smbd_vfs_init(conn)) {
841 DEBUG(0, ("vfs_init failed for service %s\n",
842 lp_servicename(snum)));
843 conn_free(conn);
844 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
845 return NULL;
846 }
847
848 /*
849 * If widelinks are disallowed we need to canonicalise the connect
850 * path here to ensure we don't have any symlinks in the
851 * connectpath. We will be checking all paths on this connection are
852 * below this directory. We must do this after the VFS init as we
853 * depend on the realpath() pointer in the vfs table. JRA.
854 */
855 if (!lp_widelinks(snum)) {
856 if (!canonicalize_connect_path(conn)) {
857 DEBUG(0, ("canonicalize_connect_path failed "
858 "for service %s, path %s\n",
859 lp_servicename(snum),
860 conn->connectpath));
861 conn_free(conn);
862 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
863 return NULL;
864 }
865 }
866
867 if ((!conn->printer) && (!conn->ipc)) {
868 conn->notify_ctx = notify_init(conn, server_id_self(),
869 smbd_messaging_context(),
870 smbd_event_context(),
871 conn);
872 }
873
874 /* ROOT Activities: */
875 /*
876 * Enforce the max connections parameter.
877 */
878
879 if ((lp_max_connections(snum) > 0)
880 && (count_current_connections(lp_servicename(SNUM(conn)), True) >=
881 lp_max_connections(snum))) {
882
883 DEBUG(1, ("Max connections (%d) exceeded for %s\n",
884 lp_max_connections(snum), lp_servicename(snum)));
885 conn_free(conn);
886 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
887 return NULL;
888 }
889
890 /*
891 * Get us an entry in the connections db
892 */
893 if (!claim_connection(conn, lp_servicename(snum), 0)) {
894 DEBUG(1, ("Could not store connections entry\n"));
895 conn_free(conn);
896 *pstatus = NT_STATUS_INTERNAL_DB_ERROR;
897 return NULL;
898 }
899
900 /* Preexecs are done here as they might make the dir we are to ChDir
901 * to below */
902 /* execute any "root preexec = " line */
903 if (*lp_rootpreexec(snum)) {
904 char *cmd = talloc_sub_advanced(talloc_tos(),
905 lp_servicename(SNUM(conn)),
906 conn->server_info->unix_name,
907 conn->connectpath,
908 conn->server_info->utok.gid,
909 conn->server_info->sanitized_username,
910 pdb_get_domain(conn->server_info->sam_account),
911 lp_rootpreexec(snum));
912 DEBUG(5,("cmd=%s\n",cmd));
913 ret = smbrun(cmd,NULL);
914 TALLOC_FREE(cmd);
915 if (ret != 0 && lp_rootpreexec_close(snum)) {
916 DEBUG(1,("root preexec gave %d - failing "
917 "connection\n", ret));
918 yield_connection(conn, lp_servicename(snum));
919 conn_free(conn);
920 *pstatus = NT_STATUS_ACCESS_DENIED;
921 return NULL;
922 }
923 }
924
925 /* USER Activites: */
926 if (!change_to_user(conn, conn->vuid)) {
927 /* No point continuing if they fail the basic checks */
928 DEBUG(0,("Can't become connected user!\n"));
929 yield_connection(conn, lp_servicename(snum));
930 conn_free(conn);
931 *pstatus = NT_STATUS_LOGON_FAILURE;
932 return NULL;
933 }
934
935 /* Remember that a different vuid can connect later without these
936 * checks... */
937
938 /* Preexecs are done here as they might make the dir we are to ChDir
939 * to below */
940
941 /* execute any "preexec = " line */
942 if (*lp_preexec(snum)) {
943 char *cmd = talloc_sub_advanced(talloc_tos(),
944 lp_servicename(SNUM(conn)),
945 conn->server_info->unix_name,
946 conn->connectpath,
947 conn->server_info->utok.gid,
948 conn->server_info->sanitized_username,
949 pdb_get_domain(conn->server_info->sam_account),
950 lp_preexec(snum));
951 ret = smbrun(cmd,NULL);
952 TALLOC_FREE(cmd);
953 if (ret != 0 && lp_preexec_close(snum)) {
954 DEBUG(1,("preexec gave %d - failing connection\n",
955 ret));
956 *pstatus = NT_STATUS_ACCESS_DENIED;
957 goto err_root_exit;
958 }
959 }
960
961 #ifdef WITH_FAKE_KASERVER
962 if (lp_afs_share(snum)) {
963 afs_login(conn);
964 }
965 #endif
966
967 /* Add veto/hide lists */
968 if (!IS_IPC(conn) && !IS_PRINT(conn)) {
969 set_namearray( &conn->veto_list, lp_veto_files(snum));
970 set_namearray( &conn->hide_list, lp_hide_files(snum));
971 set_namearray( &conn->veto_oplock_list, lp_veto_oplocks(snum));
972 set_namearray( &conn->aio_write_behind_list,
973 lp_aio_write_behind(snum));
974 }
975
976 /* Invoke VFS make connection hook - do this before the VFS_STAT call
977 to allow any filesystems needing user credentials to initialize
978 themselves. */
979
980 if (SMB_VFS_CONNECT(conn, lp_servicename(snum),
981 conn->server_info->unix_name) < 0) {
982 DEBUG(0,("make_connection: VFS make connection failed!\n"));
983 *pstatus = NT_STATUS_UNSUCCESSFUL;
984 goto err_root_exit;
985 }
986
987 /* Any error exit after here needs to call the disconnect hook. */
988 on_err_call_dis_hook = true;
989
990 status = create_synthetic_smb_fname(talloc_tos(), conn->connectpath,
991 NULL, NULL, &smb_fname_cpath);
992 if (!NT_STATUS_IS_OK(status)) {
993 *pstatus = status;
994 goto err_root_exit;
995 }
996
997 /* win2000 does not check the permissions on the directory
998 during the tree connect, instead relying on permission
999 check during individual operations. To match this behaviour
1000 I have disabled this chdir check (tridge) */
1001 /* the alternative is just to check the directory exists */
1002 if ((ret = SMB_VFS_STAT(conn, smb_fname_cpath)) != 0 ||
1003 !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
1004 if (ret == 0 && !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
1005 DEBUG(0,("'%s' is not a directory, when connecting to "
1006 "[%s]\n", conn->connectpath,
1007 lp_servicename(snum)));
1008 } else {
1009 DEBUG(0,("'%s' does not exist or permission denied "
1010 "when connecting to [%s] Error was %s\n",
1011 conn->connectpath, lp_servicename(snum),
1012 strerror(errno) ));
1013 }
1014 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
1015 goto err_root_exit;
1016 }
1017
1018 string_set(&conn->origpath,conn->connectpath);
1019
1020 #if SOFTLINK_OPTIMISATION
1021 /* resolve any soft links early if possible */
1022 if (vfs_ChDir(conn,conn->connectpath) == 0) {
1023 TALLOC_CTX *ctx = talloc_tos();
1024 char *s = vfs_GetWd(ctx,s);
1025 if (!s) {
1026 *status = map_nt_error_from_unix(errno);
1027 goto err_root_exit;
1028 }
1029 if (!set_conn_connectpath(conn,s)) {
1030 *status = NT_STATUS_NO_MEMORY;
1031 goto err_root_exit;
1032 }
1033 vfs_ChDir(conn,conn->connectpath);
1034 }
1035 #endif
1036
1037 /* Figure out the characteristics of the underlying filesystem. This
1038 * assumes that all the filesystem mounted withing a share path have
1039 * the same characteristics, which is likely but not guaranteed.
1040 */
1041
1042 conn->fs_capabilities = SMB_VFS_FS_CAPABILITIES(conn, &conn->ts_res);
1043
1044 /*
1045 * Print out the 'connected as' stuff here as we need
1046 * to know the effective uid and gid we will be using
1047 * (at least initially).
1048 */
1049
1050 if( DEBUGLVL( IS_IPC(conn) ? 3 : 1 ) ) {
1051 dbgtext( "%s (%s) ", get_remote_machine_name(),
1052 conn->client_address );
1053 dbgtext( "%s", srv_is_signing_active(smbd_server_conn) ? "signed " : "");
1054 dbgtext( "connect to service %s ", lp_servicename(snum) );
1055 dbgtext( "initially as user %s ",
1056 conn->server_info->unix_name );
1057 dbgtext( "(uid=%d, gid=%d) ", (int)geteuid(), (int)getegid() );
1058 dbgtext( "(pid %d)\n", (int)sys_getpid() );
1059 }
1060
1061 /* we've finished with the user stuff - go back to root */
1062 change_to_root_user();
1063 return(conn);
1064
1065 err_root_exit:
1066 TALLOC_FREE(smb_fname_cpath);
1067 change_to_root_user();
1068 if (on_err_call_dis_hook) {
1069 /* Call VFS disconnect hook */
1070 SMB_VFS_DISCONNECT(conn);
1071 }
1072 yield_connection(conn, lp_servicename(snum));
1073 conn_free(conn);
1074 return NULL;
1075 }
1076
1077 /****************************************************************************
1078 Make a connection to a service.
1079 *
1080 * @param service
1081 ****************************************************************************/
1082
1083 connection_struct *make_connection(struct smbd_server_connection *sconn,
1084 const char *service_in, DATA_BLOB password,
1085 const char *pdev, uint16 vuid,
1086 NTSTATUS *status)
1087 {
1088 uid_t euid;
1089 user_struct *vuser = NULL;
1090 fstring service;
1091 fstring dev;
1092 int snum = -1;
1093 char addr[INET6_ADDRSTRLEN];
1094
1095 fstrcpy(dev, pdev);
1096
1097 /* This must ONLY BE CALLED AS ROOT. As it exits this function as
1098 * root. */
1099 if (!non_root_mode() && (euid = geteuid()) != 0) {
1100 DEBUG(0,("make_connection: PANIC ERROR. Called as nonroot "
1101 "(%u)\n", (unsigned int)euid ));
1102 smb_panic("make_connection: PANIC ERROR. Called as nonroot\n");
1103 }
1104
1105 if (conn_num_open(sconn) > 2047) {
1106 *status = NT_STATUS_INSUFF_SERVER_RESOURCES;
1107 return NULL;
1108 }
1109
1110 if(lp_security() != SEC_SHARE) {
1111 vuser = get_valid_user_struct(sconn, vuid);
1112 if (!vuser) {
1113 DEBUG(1,("make_connection: refusing to connect with "
1114 "no session setup\n"));
1115 *status = NT_STATUS_ACCESS_DENIED;
1116 return NULL;
1117 }
1118 }
1119
1120 /* Logic to try and connect to the correct [homes] share, preferably
1121 without too many getpwnam() lookups. This is particulary nasty for
1122 winbind usernames, where the share name isn't the same as unix
1123 username.
1124
1125 The snum of the homes share is stored on the vuser at session setup
1126 time.
1127 */
1128
1129 if (strequal(service_in,HOMES_NAME)) {
1130 if(lp_security() != SEC_SHARE) {
1131 DATA_BLOB no_pw = data_blob_null;
1132 if (vuser->homes_snum == -1) {
1133 DEBUG(2, ("[homes] share not available for "
1134 "this user because it was not found "
1135 "or created at session setup "
1136 "time\n"));
1137 *status = NT_STATUS_BAD_NETWORK_NAME;
1138 return NULL;
1139 }
1140 DEBUG(5, ("making a connection to [homes] service "
1141 "created at session setup time\n"));
1142 return make_connection_snum(sconn,
1143 vuser->homes_snum,
1144 vuser, no_pw,
1145 dev, status);
1146 } else {
1147 /* Security = share. Try with
1148 * current_user_info.smb_name as the username. */
1149 if (*current_user_info.smb_name) {
1150 fstring unix_username;
1151 fstrcpy(unix_username,
1152 current_user_info.smb_name);
1153 map_username(sconn, unix_username);
1154 snum = find_service(unix_username);
1155 }
1156 if (snum != -1) {
1157 DEBUG(5, ("making a connection to 'homes' "
1158 "service %s based on "
1159 "security=share\n", service_in));
1160 return make_connection_snum(sconn,
1161 snum, NULL,
1162 password,
1163 dev, status);
1164 }
1165 }
1166 } else if ((lp_security() != SEC_SHARE) && (vuser->homes_snum != -1)
1167 && strequal(service_in,
1168 lp_servicename(vuser->homes_snum))) {
1169 DATA_BLOB no_pw = data_blob_null;
1170 DEBUG(5, ("making a connection to 'homes' service [%s] "
1171 "created at session setup time\n", service_in));
1172 return make_connection_snum(sconn,
1173 vuser->homes_snum,
1174 vuser, no_pw,
1175 dev, status);
1176 }
1177
1178 fstrcpy(service, service_in);
1179
1180 strlower_m(service);
1181
1182 snum = find_service(service);
1183
1184 if (snum < 0) {
1185 if (strequal(service,"IPC$") ||
1186 (lp_enable_asu_support() && strequal(service,"ADMIN$"))) {
1187 DEBUG(3,("refusing IPC connection to %s\n", service));
1188 *status = NT_STATUS_ACCESS_DENIED;
1189 return NULL;
1190 }
1191
1192 DEBUG(0,("%s (%s) couldn't find service %s\n",
1193 get_remote_machine_name(),
1194 client_addr(get_client_fd(),addr,sizeof(addr)),
1195 service));
1196 *status = NT_STATUS_BAD_NETWORK_NAME;
1197 return NULL;
1198 }
1199
1200 /* Handle non-Dfs clients attempting connections to msdfs proxy */
1201 if (lp_host_msdfs() && (*lp_msdfs_proxy(snum) != '\0')) {
1202 DEBUG(3, ("refusing connection to dfs proxy share '%s' "
1203 "(pointing to %s)\n",
1204 service, lp_msdfs_proxy(snum)));
1205 *status = NT_STATUS_BAD_NETWORK_NAME;
1206 return NULL;
1207 }
1208
1209 DEBUG(5, ("making a connection to 'normal' service %s\n", service));
1210
1211 return make_connection_snum(sconn, snum, vuser,
1212 password,
1213 dev, status);
1214 }
1215
1216 /****************************************************************************
1217 Close a cnum.
1218 ****************************************************************************/
1219
1220 void close_cnum(connection_struct *conn, uint16 vuid)
1221 {
1222 file_close_conn(conn);
1223
1224 if (!IS_IPC(conn)) {
1225 dptr_closecnum(conn);
1226 }
1227
1228 change_to_root_user();
1229
1230 DEBUG(IS_IPC(conn)?3:1, ("%s (%s) closed connection to service %s\n",
1231 get_remote_machine_name(),
1232 conn->client_address,
1233 lp_servicename(SNUM(conn))));
1234
1235 /* Call VFS disconnect hook */
1236 SMB_VFS_DISCONNECT(conn);
1237
1238 yield_connection(conn, lp_servicename(SNUM(conn)));
1239
1240 /* make sure we leave the directory available for unmount */
1241 vfs_ChDir(conn, "/");
1242
1243 /* execute any "postexec = " line */
1244 if (*lp_postexec(SNUM(conn)) &&
1245 change_to_user(conn, vuid)) {
1246 char *cmd = talloc_sub_advanced(talloc_tos(),
1247 lp_servicename(SNUM(conn)),
1248 conn->server_info->unix_name,
1249 conn->connectpath,
1250 conn->server_info->utok.gid,
1251 conn->server_info->sanitized_username,
1252 pdb_get_domain(conn->server_info->sam_account),
1253 lp_postexec(SNUM(conn)));
1254 smbrun(cmd,NULL);
1255 TALLOC_FREE(cmd);
1256 change_to_root_user();
1257 }
1258
1259 change_to_root_user();
1260 /* execute any "root postexec = " line */
1261 if (*lp_rootpostexec(SNUM(conn))) {
1262 char *cmd = talloc_sub_advanced(talloc_tos(),
1263 lp_servicename(SNUM(conn)),
1264 conn->server_info->unix_name,
1265 conn->connectpath,
1266 conn->server_info->utok.gid,
1267 conn->server_info->sanitized_username,
1268 pdb_get_domain(conn->server_info->sam_account),
1269 lp_rootpostexec(SNUM(conn)));
1270 smbrun(cmd,NULL);
1271 TALLOC_FREE(cmd);
1272 }
1273
1274 conn_free(conn);
1275 }
aatanasov's samba4 branch