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Fix bug #9016 - Connection to outbound trusted domain goes offline.
[Samba.git] / source3 / smbd / service.c
blob2de9384893568d8cec52c5fcf3da8d82c062debe
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 if (connectpath == NULL || connectpath[0] == '\0') {
60 return false;
61 }
62
63 /* Allocate for strlen + '\0' + possible leading '/' */
64 destname = SMB_MALLOC(strlen(connectpath) + 2);
65 if (!destname) {
66 return false;
67 }
68 d = destname;
69
70 *d++ = '/'; /* Always start with root. */
71
72 while (*s) {
73 if (*s == '/') {
74 /* Eat multiple '/' */
75 while (*s == '/') {
76 s++;
77 }
78 if ((d > destname + 1) && (*s != '\0')) {
79 *d++ = '/';
80 }
81 start_of_name_component = True;
82 continue;
83 }
84
85 if (start_of_name_component) {
86 if ((s[0] == '.') && (s[1] == '.') && (s[2] == '/' || s[2] == '\0')) {
87 /* Uh oh - "/../" or "/..\0" ! */
88
89 /* Go past the ../ or .. */
90 if (s[2] == '/') {
91 s += 3;
92 } else {
93 s += 2; /* Go past the .. */
94 }
95
96 /* If we just added a '/' - delete it */
97 if ((d > destname) && (*(d-1) == '/')) {
98 *(d-1) = '\0';
99 d--;
100 }
101
102 /* Are we at the start ? Can't go back further if so. */
103 if (d <= destname) {
104 *d++ = '/'; /* Can't delete root */
105 continue;
106 }
107 /* Go back one level... */
108 /* Decrement d first as d points to the *next* char to write into. */
109 for (d--; d > destname; d--) {
110 if (*d == '/') {
111 break;
112 }
113 }
114 /* We're still at the start of a name component, just the previous one. */
115 continue;
116 } else if ((s[0] == '.') && ((s[1] == '\0') || s[1] == '/')) {
117 /* Component of pathname can't be "." only - skip the '.' . */
118 if (s[1] == '/') {
119 s += 2;
120 } else {
121 s++;
122 }
123 continue;
124 }
125 }
126
127 if (!(*s & 0x80)) {
128 *d++ = *s++;
129 } else {
130 size_t siz;
131 /* Get the size of the next MB character. */
132 next_codepoint(s,&siz);
133 switch(siz) {
134 case 5:
135 *d++ = *s++;
136 /*fall through*/
137 case 4:
138 *d++ = *s++;
139 /*fall through*/
140 case 3:
141 *d++ = *s++;
142 /*fall through*/
143 case 2:
144 *d++ = *s++;
145 /*fall through*/
146 case 1:
147 *d++ = *s++;
148 break;
149 default:
150 break;
151 }
152 }
153 start_of_name_component = false;
154 }
155 *d = '\0';
156
157 /* And must not end in '/' */
158 if (d > destname + 1 && (*(d-1) == '/')) {
159 *(d-1) = '\0';
160 }
161
162 DEBUG(10,("set_conn_connectpath: service %s, connectpath = %s\n",
163 lp_servicename(SNUM(conn)), destname ));
164
165 string_set(&conn->connectpath, destname);
166 SAFE_FREE(destname);
167 return true;
168 }
169
170 /****************************************************************************
171 Load parameters specific to a connection/service.
172 ****************************************************************************/
173
174 bool set_current_service(connection_struct *conn, uint16 flags, bool do_chdir)
175 {
176 int snum;
177
178 if (!conn) {
179 last_conn = NULL;
180 return(False);
181 }
182
183 conn->lastused_count++;
184
185 snum = SNUM(conn);
186
187 if (do_chdir &&
188 vfs_ChDir(conn,conn->connectpath) != 0 &&
189 vfs_ChDir(conn,conn->origpath) != 0) {
190 DEBUG(((errno!=EACCES)?0:3),("chdir (%s) failed, reason: %s\n",
191 conn->connectpath, strerror(errno)));
192 return(False);
193 }
194
195 if ((conn == last_conn) && (last_flags == flags)) {
196 return(True);
197 }
198
199 last_conn = conn;
200 last_flags = flags;
201
202 /* Obey the client case sensitivity requests - only for clients that support it. */
203 switch (lp_casesensitive(snum)) {
204 case Auto:
205 {
206 /* We need this uglyness due to DOS/Win9x clients that lie about case insensitivity. */
207 enum remote_arch_types ra_type = get_remote_arch();
208 if ((ra_type != RA_SAMBA) && (ra_type != RA_CIFSFS)) {
209 /* Client can't support per-packet case sensitive pathnames. */
210 conn->case_sensitive = False;
211 } else {
212 conn->case_sensitive = !(flags & FLAG_CASELESS_PATHNAMES);
213 }
214 }
215 break;
216 case True:
217 conn->case_sensitive = True;
218 break;
219 default:
220 conn->case_sensitive = False;
221 break;
222 }
223 return(True);
224 }
225
226 static int load_registry_service(const char *servicename)
227 {
228 if (!lp_registry_shares()) {
229 return -1;
230 }
231
232 if ((servicename == NULL) || (*servicename == '\0')) {
233 return -1;
234 }
235
236 if (strequal(servicename, GLOBAL_NAME)) {
237 return -2;
238 }
239
240 if (!process_registry_service(servicename)) {
241 return -1;
242 }
243
244 return lp_servicenumber(servicename);
245 }
246
247 void load_registry_shares(void)
248 {
249 DEBUG(8, ("load_registry_shares()\n"));
250 if (!lp_registry_shares()) {
251 return;
252 }
253
254 process_registry_shares();
255
256 return;
257 }
258
259 /****************************************************************************
260 Add a home service. Returns the new service number or -1 if fail.
261 ****************************************************************************/
262
263 int add_home_service(const char *service, const char *username, const char *homedir)
264 {
265 int iHomeService;
266
267 if (!service || !homedir || homedir[0] == '\0')
268 return -1;
269
270 if ((iHomeService = lp_servicenumber(HOMES_NAME)) < 0) {
271 if ((iHomeService = load_registry_service(HOMES_NAME)) < 0) {
272 return -1;
273 }
274 }
275
276 /*
277 * If this is a winbindd provided username, remove
278 * the domain component before adding the service.
279 * Log a warning if the "path=" parameter does not
280 * include any macros.
281 */
282
283 {
284 const char *p = strchr(service,*lp_winbind_separator());
285
286 /* We only want the 'user' part of the string */
287 if (p) {
288 service = p + 1;
289 }
290 }
291
292 if (!lp_add_home(service, iHomeService, username, homedir)) {
293 return -1;
294 }
295
296 return lp_servicenumber(service);
297
298 }
299
300 /**
301 * Find a service entry.
302 *
303 * @param service is modified (to canonical form??)
304 **/
305
306 int find_service(fstring service)
307 {
308 int iService;
309 struct smbd_server_connection *sconn = smbd_server_conn;
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(sconn, 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(int snum, fstring dev)
428 {
429
430 if (!lp_snum_ok(snum) ||
431 !check_access(smbd_server_fd(),
432 lp_hostsallow(snum), lp_hostsdeny(snum))) {
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 DOM_SID *pgroup_sid,
478 gid_t *pgid)
479 {
480 NTSTATUS result = NT_STATUS_NO_SUCH_GROUP;
481 TALLOC_CTX *frame = talloc_stackframe();
482 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 pdb_get_domain(vuid_serverinfo->sam_account),
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;
651 struct smb_filename *smb_fname_cpath = NULL;
652 fstring dev;
653 int ret;
654 char addr[INET6_ADDRSTRLEN];
655 NTSTATUS status;
656
657 fstrcpy(dev, pdev);
658
659 if (NT_STATUS_IS_ERR(*pstatus = share_sanity_checks(snum, dev))) {
660 return NULL;
661 }
662
663 conn = conn_new(sconn);
664 if (!conn) {
665 DEBUG(0,("Couldn't find free connection.\n"));
666 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
667 return NULL;
668 }
669
670 conn->params->service = snum;
671
672 status = create_connection_server_info(sconn,
673 conn, snum, vuser ? vuser->server_info : NULL, password,
674 &conn->server_info);
675
676 if (!NT_STATUS_IS_OK(status)) {
677 DEBUG(1, ("create_connection_server_info failed: %s\n",
678 nt_errstr(status)));
679 *pstatus = status;
680 conn_free(conn);
681 return NULL;
682 }
683
684 if ((lp_guest_only(snum)) || (lp_security() == SEC_SHARE)) {
685 conn->force_user = true;
686 }
687
688 add_session_user(sconn, conn->server_info->unix_name);
689
690 safe_strcpy(conn->client_address,
691 client_addr(get_client_fd(),addr,sizeof(addr)),
692 sizeof(conn->client_address)-1);
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 conn->admin_user = False;
721
722 if (*lp_force_user(snum)) {
723
724 /*
725 * Replace conn->server_info with a completely faked up one
726 * from the username we are forced into :-)
727 */
728
729 char *fuser;
730 struct auth_serversupplied_info *forced_serverinfo;
731
732 fuser = talloc_string_sub(conn, lp_force_user(snum), "%S",
733 lp_servicename(snum));
734 if (fuser == NULL) {
735 conn_free(conn);
736 *pstatus = NT_STATUS_NO_MEMORY;
737 return NULL;
738 }
739
740 status = make_serverinfo_from_username(
741 conn, fuser, conn->server_info->guest,
742 &forced_serverinfo);
743 if (!NT_STATUS_IS_OK(status)) {
744 conn_free(conn);
745 *pstatus = status;
746 return NULL;
747 }
748
749 /* We don't want to replace the original sanitized_username
750 as it is the original user given in the connect attempt.
751 This is used in '%U' substitutions. */
752 TALLOC_FREE(forced_serverinfo->sanitized_username);
753 forced_serverinfo->sanitized_username =
754 talloc_move(forced_serverinfo,
755 &conn->server_info->sanitized_username);
756
757 TALLOC_FREE(conn->server_info);
758 conn->server_info = forced_serverinfo;
759
760 conn->force_user = True;
761 DEBUG(3,("Forced user %s\n", fuser));
762 }
763
764 /*
765 * If force group is true, then override
766 * any groupid stored for the connecting user.
767 */
768
769 if (*lp_force_group(snum)) {
770
771 status = find_forced_group(
772 conn->force_user, snum, conn->server_info->unix_name,
773 &conn->server_info->ptok->user_sids[1],
774 &conn->server_info->utok.gid);
775
776 if (!NT_STATUS_IS_OK(status)) {
777 conn_free(conn);
778 *pstatus = status;
779 return NULL;
780 }
781
782 /*
783 * We need to cache this gid, to use within
784 * change_to_user() separately from the conn->server_info
785 * struct. We only use conn->server_info directly if
786 * "force_user" was set.
787 */
788 conn->force_group_gid = conn->server_info->utok.gid;
789 }
790
791 conn->vuid = (vuser != NULL) ? vuser->vuid : UID_FIELD_INVALID;
792
793 {
794 char *s = talloc_sub_advanced(talloc_tos(),
795 lp_servicename(SNUM(conn)),
796 conn->server_info->unix_name,
797 conn->connectpath,
798 conn->server_info->utok.gid,
799 conn->server_info->sanitized_username,
800 pdb_get_domain(conn->server_info->sam_account),
801 lp_pathname(snum));
802 if (!s) {
803 conn_free(conn);
804 *pstatus = NT_STATUS_NO_MEMORY;
805 return NULL;
806 }
807
808 if (!set_conn_connectpath(conn,s)) {
809 TALLOC_FREE(s);
810 conn_free(conn);
811 *pstatus = NT_STATUS_NO_MEMORY;
812 return NULL;
813 }
814 DEBUG(3,("Connect path is '%s' for service [%s]\n",s,
815 lp_servicename(snum)));
816 TALLOC_FREE(s);
817 }
818
819 /*
820 * New code to check if there's a share security descripter
821 * added from NT server manager. This is done after the
822 * smb.conf checks are done as we need a uid and token. JRA.
823 *
824 */
825
826 {
827 bool can_write = False;
828
829 can_write = share_access_check(conn->server_info->ptok,
830 lp_servicename(snum),
831 FILE_WRITE_DATA);
832
833 if (!can_write) {
834 if (!share_access_check(conn->server_info->ptok,
835 lp_servicename(snum),
836 FILE_READ_DATA)) {
837 /* No access, read or write. */
838 DEBUG(0,("make_connection: connection to %s "
839 "denied due to security "
840 "descriptor.\n",
841 lp_servicename(snum)));
842 conn_free(conn);
843 *pstatus = NT_STATUS_ACCESS_DENIED;
844 return NULL;
845 } else {
846 conn->read_only = True;
847 }
848 }
849 }
850 /* Initialise VFS function pointers */
851
852 if (!smbd_vfs_init(conn)) {
853 DEBUG(0, ("vfs_init failed for service %s\n",
854 lp_servicename(snum)));
855 conn_free(conn);
856 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
857 return NULL;
858 }
859
860 if ((!conn->printer) && (!conn->ipc)) {
861 conn->notify_ctx = notify_init(conn, server_id_self(),
862 smbd_messaging_context(),
863 smbd_event_context(),
864 conn);
865 }
866
867 /* ROOT Activities: */
868 /* explicitly check widelinks here so that we can correctly warn
869 * in the logs. */
870 widelinks_warning(snum);
871
872 /*
873 * Enforce the max connections parameter.
874 */
875
876 if ((lp_max_connections(snum) > 0)
877 && (count_current_connections(lp_servicename(SNUM(conn)), True) >=
878 lp_max_connections(snum))) {
879
880 DEBUG(1, ("Max connections (%d) exceeded for %s\n",
881 lp_max_connections(snum), lp_servicename(snum)));
882 conn_free(conn);
883 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
884 return NULL;
885 }
886
887 /*
888 * Get us an entry in the connections db
889 */
890 if (!claim_connection(conn, lp_servicename(snum), 0)) {
891 DEBUG(1, ("Could not store connections entry\n"));
892 conn_free(conn);
893 *pstatus = NT_STATUS_INTERNAL_DB_ERROR;
894 return NULL;
895 }
896
897 /* Invoke VFS make connection hook - must be the first
898 VFS operation we do. */
899
900 if (SMB_VFS_CONNECT(conn, lp_servicename(snum),
901 conn->server_info->unix_name) < 0) {
902 DEBUG(0,("make_connection: VFS make connection failed!\n"));
903 yield_connection(conn, lp_servicename(snum));
904 conn_free(conn);
905 *pstatus = NT_STATUS_UNSUCCESSFUL;
906 return NULL;
907 }
908
909 /*
910 * Fix compatibility issue pointed out by Volker.
911 * We pass the conn->connectpath to the preexec
912 * scripts as a parameter, so attempt to canonicalize
913 * it here before calling the preexec scripts.
914 * We ignore errors here, as it is possible that
915 * the conn->connectpath doesn't exist yet and
916 * the preexec scripts will create them.
917 */
918
919 (void)canonicalize_connect_path(conn);
920
921 /* Preexecs are done here as they might make the dir we are to ChDir
922 * to below */
923 /* execute any "root preexec = " line */
924 if (*lp_rootpreexec(snum)) {
925 char *cmd = talloc_sub_advanced(talloc_tos(),
926 lp_servicename(SNUM(conn)),
927 conn->server_info->unix_name,
928 conn->connectpath,
929 conn->server_info->utok.gid,
930 conn->server_info->sanitized_username,
931 pdb_get_domain(conn->server_info->sam_account),
932 lp_rootpreexec(snum));
933 DEBUG(5,("cmd=%s\n",cmd));
934 ret = smbrun(cmd,NULL);
935 TALLOC_FREE(cmd);
936 if (ret != 0 && lp_rootpreexec_close(snum)) {
937 DEBUG(1,("root preexec gave %d - failing "
938 "connection\n", ret));
939 SMB_VFS_DISCONNECT(conn);
940 yield_connection(conn, lp_servicename(snum));
941 conn_free(conn);
942 *pstatus = NT_STATUS_ACCESS_DENIED;
943 return NULL;
944 }
945 }
946
947 /* USER Activites: */
948 if (!change_to_user(conn, conn->vuid)) {
949 /* No point continuing if they fail the basic checks */
950 DEBUG(0,("Can't become connected user!\n"));
951 SMB_VFS_DISCONNECT(conn);
952 yield_connection(conn, lp_servicename(snum));
953 conn_free(conn);
954 *pstatus = NT_STATUS_LOGON_FAILURE;
955 return NULL;
956 }
957
958 /* Remember that a different vuid can connect later without these
959 * checks... */
960
961 /* Preexecs are done here as they might make the dir we are to ChDir
962 * to below */
963
964 /* execute any "preexec = " line */
965 if (*lp_preexec(snum)) {
966 char *cmd = talloc_sub_advanced(talloc_tos(),
967 lp_servicename(SNUM(conn)),
968 conn->server_info->unix_name,
969 conn->connectpath,
970 conn->server_info->utok.gid,
971 conn->server_info->sanitized_username,
972 pdb_get_domain(conn->server_info->sam_account),
973 lp_preexec(snum));
974 ret = smbrun(cmd,NULL);
975 TALLOC_FREE(cmd);
976 if (ret != 0 && lp_preexec_close(snum)) {
977 DEBUG(1,("preexec gave %d - failing connection\n",
978 ret));
979 *pstatus = NT_STATUS_ACCESS_DENIED;
980 goto err_root_exit;
981 }
982 }
983
984 /*
985 * If widelinks are disallowed we need to canonicalise the connect
986 * path here to ensure we don't have any symlinks in the
987 * connectpath. We will be checking all paths on this connection are
988 * below this directory. We must do this after the VFS init as we
989 * depend on the realpath() pointer in the vfs table. JRA.
990 */
991 if (!lp_widelinks(snum)) {
992 if (!canonicalize_connect_path(conn)) {
993 DEBUG(0, ("canonicalize_connect_path failed "
994 "for service %s, path %s\n",
995 lp_servicename(snum),
996 conn->connectpath));
997 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
998 goto err_root_exit;
999 }
1000 }
1001
1002 #ifdef WITH_FAKE_KASERVER
1003 if (lp_afs_share(snum)) {
1004 afs_login(conn);
1005 }
1006 #endif
1007
1008 /* Add veto/hide lists */
1009 if (!IS_IPC(conn) && !IS_PRINT(conn)) {
1010 set_namearray( &conn->veto_list, lp_veto_files(snum));
1011 set_namearray( &conn->hide_list, lp_hide_files(snum));
1012 set_namearray( &conn->veto_oplock_list, lp_veto_oplocks(snum));
1013 set_namearray( &conn->aio_write_behind_list,
1014 lp_aio_write_behind(snum));
1015 }
1016
1017 status = create_synthetic_smb_fname(talloc_tos(), conn->connectpath,
1018 NULL, NULL, &smb_fname_cpath);
1019 if (!NT_STATUS_IS_OK(status)) {
1020 *pstatus = status;
1021 goto err_root_exit;
1022 }
1023
1024 /* win2000 does not check the permissions on the directory
1025 during the tree connect, instead relying on permission
1026 check during individual operations. To match this behaviour
1027 I have disabled this chdir check (tridge) */
1028 /* the alternative is just to check the directory exists */
1029 if ((ret = SMB_VFS_STAT(conn, smb_fname_cpath)) != 0 ||
1030 !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
1031 if (ret == 0 && !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
1032 DEBUG(0,("'%s' is not a directory, when connecting to "
1033 "[%s]\n", conn->connectpath,
1034 lp_servicename(snum)));
1035 } else {
1036 DEBUG(0,("'%s' does not exist or permission denied "
1037 "when connecting to [%s] Error was %s\n",
1038 conn->connectpath, lp_servicename(snum),
1039 strerror(errno) ));
1040 }
1041 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
1042 goto err_root_exit;
1043 }
1044 conn->base_share_dev = smb_fname_cpath->st.st_ex_dev;
1045
1046 string_set(&conn->origpath,conn->connectpath);
1047
1048 #if SOFTLINK_OPTIMISATION
1049 /* resolve any soft links early if possible */
1050 if (vfs_ChDir(conn,conn->connectpath) == 0) {
1051 TALLOC_CTX *ctx = talloc_tos();
1052 char *s = vfs_GetWd(ctx,s);
1053 if (!s) {
1054 *status = map_nt_error_from_unix(errno);
1055 goto err_root_exit;
1056 }
1057 if (!set_conn_connectpath(conn,s)) {
1058 *status = NT_STATUS_NO_MEMORY;
1059 goto err_root_exit;
1060 }
1061 vfs_ChDir(conn,conn->connectpath);
1062 }
1063 #endif
1064
1065 /* Figure out the characteristics of the underlying filesystem. This
1066 * assumes that all the filesystem mounted withing a share path have
1067 * the same characteristics, which is likely but not guaranteed.
1068 */
1069
1070 conn->fs_capabilities = SMB_VFS_FS_CAPABILITIES(conn, &conn->ts_res);
1071
1072 /*
1073 * Print out the 'connected as' stuff here as we need
1074 * to know the effective uid and gid we will be using
1075 * (at least initially).
1076 */
1077
1078 if( DEBUGLVL( IS_IPC(conn) ? 3 : 1 ) ) {
1079 dbgtext( "%s (%s) ", get_remote_machine_name(),
1080 conn->client_address );
1081 dbgtext( "%s", srv_is_signing_active(smbd_server_conn) ? "signed " : "");
1082 dbgtext( "connect to service %s ", lp_servicename(snum) );
1083 dbgtext( "initially as user %s ",
1084 conn->server_info->unix_name );
1085 dbgtext( "(uid=%d, gid=%d) ", (int)geteuid(), (int)getegid() );
1086 dbgtext( "(pid %d)\n", (int)sys_getpid() );
1087 }
1088
1089 /* we've finished with the user stuff - go back to root */
1090 change_to_root_user();
1091 return(conn);
1092
1093 err_root_exit:
1094 TALLOC_FREE(smb_fname_cpath);
1095 change_to_root_user();
1096 /* Call VFS disconnect hook */
1097 SMB_VFS_DISCONNECT(conn);
1098 yield_connection(conn, lp_servicename(snum));
1099 conn_free(conn);
1100 return NULL;
1101 }
1102
1103 /****************************************************************************
1104 Make a connection to a service.
1105 *
1106 * @param service
1107 ****************************************************************************/
1108
1109 connection_struct *make_connection(struct smbd_server_connection *sconn,
1110 const char *service_in, DATA_BLOB password,
1111 const char *pdev, uint16 vuid,
1112 NTSTATUS *status)
1113 {
1114 uid_t euid;
1115 user_struct *vuser = NULL;
1116 fstring service;
1117 fstring dev;
1118 int snum = -1;
1119 char addr[INET6_ADDRSTRLEN];
1120
1121 fstrcpy(dev, pdev);
1122
1123 /* This must ONLY BE CALLED AS ROOT. As it exits this function as
1124 * root. */
1125 if (!non_root_mode() && (euid = geteuid()) != 0) {
1126 DEBUG(0,("make_connection: PANIC ERROR. Called as nonroot "
1127 "(%u)\n", (unsigned int)euid ));
1128 smb_panic("make_connection: PANIC ERROR. Called as nonroot\n");
1129 }
1130
1131 if (conn_num_open(sconn) > 2047) {
1132 *status = NT_STATUS_INSUFF_SERVER_RESOURCES;
1133 return NULL;
1134 }
1135
1136 if(lp_security() != SEC_SHARE) {
1137 vuser = get_valid_user_struct(sconn, vuid);
1138 if (!vuser) {
1139 DEBUG(1,("make_connection: refusing to connect with "
1140 "no session setup\n"));
1141 *status = NT_STATUS_ACCESS_DENIED;
1142 return NULL;
1143 }
1144 }
1145
1146 /* Logic to try and connect to the correct [homes] share, preferably
1147 without too many getpwnam() lookups. This is particulary nasty for
1148 winbind usernames, where the share name isn't the same as unix
1149 username.
1150
1151 The snum of the homes share is stored on the vuser at session setup
1152 time.
1153 */
1154
1155 if (strequal(service_in,HOMES_NAME)) {
1156 if(lp_security() != SEC_SHARE) {
1157 DATA_BLOB no_pw = data_blob_null;
1158 if (vuser->homes_snum == -1) {
1159 DEBUG(2, ("[homes] share not available for "
1160 "this user because it was not found "
1161 "or created at session setup "
1162 "time\n"));
1163 *status = NT_STATUS_BAD_NETWORK_NAME;
1164 return NULL;
1165 }
1166 DEBUG(5, ("making a connection to [homes] service "
1167 "created at session setup time\n"));
1168 return make_connection_snum(sconn,
1169 vuser->homes_snum,
1170 vuser, no_pw,
1171 dev, status);
1172 } else {
1173 /* Security = share. Try with
1174 * current_user_info.smb_name as the username. */
1175 if (*current_user_info.smb_name) {
1176 fstring unix_username;
1177 fstrcpy(unix_username,
1178 current_user_info.smb_name);
1179 map_username(sconn, unix_username);
1180 snum = find_service(unix_username);
1181 }
1182 if (snum != -1) {
1183 DEBUG(5, ("making a connection to 'homes' "
1184 "service %s based on "
1185 "security=share\n", service_in));
1186 return make_connection_snum(sconn,
1187 snum, NULL,
1188 password,
1189 dev, status);
1190 }
1191 }
1192 } else if ((lp_security() != SEC_SHARE) && (vuser->homes_snum != -1)
1193 && strequal(service_in,
1194 lp_servicename(vuser->homes_snum))) {
1195 DATA_BLOB no_pw = data_blob_null;
1196 DEBUG(5, ("making a connection to 'homes' service [%s] "
1197 "created at session setup time\n", service_in));
1198 return make_connection_snum(sconn,
1199 vuser->homes_snum,
1200 vuser, no_pw,
1201 dev, status);
1202 }
1203
1204 fstrcpy(service, service_in);
1205
1206 strlower_m(service);
1207
1208 snum = find_service(service);
1209
1210 if (snum < 0) {
1211 if (strequal(service,"IPC$") ||
1212 (lp_enable_asu_support() && strequal(service,"ADMIN$"))) {
1213 DEBUG(3,("refusing IPC connection to %s\n", service));
1214 *status = NT_STATUS_ACCESS_DENIED;
1215 return NULL;
1216 }
1217
1218 DEBUG(3,("%s (%s) couldn't find service %s\n",
1219 get_remote_machine_name(),
1220 client_addr(get_client_fd(),addr,sizeof(addr)),
1221 service));
1222 *status = NT_STATUS_BAD_NETWORK_NAME;
1223 return NULL;
1224 }
1225
1226 /* Handle non-Dfs clients attempting connections to msdfs proxy */
1227 if (lp_host_msdfs() && (*lp_msdfs_proxy(snum) != '\0')) {
1228 DEBUG(3, ("refusing connection to dfs proxy share '%s' "
1229 "(pointing to %s)\n",
1230 service, lp_msdfs_proxy(snum)));
1231 *status = NT_STATUS_BAD_NETWORK_NAME;
1232 return NULL;
1233 }
1234
1235 DEBUG(5, ("making a connection to 'normal' service %s\n", service));
1236
1237 return make_connection_snum(sconn, snum, vuser,
1238 password,
1239 dev, status);
1240 }
1241
1242 /****************************************************************************
1243 Close a cnum.
1244 ****************************************************************************/
1245
1246 void close_cnum(connection_struct *conn, uint16 vuid)
1247 {
1248 file_close_conn(conn);
1249
1250 if (!IS_IPC(conn)) {
1251 dptr_closecnum(conn);
1252 }
1253
1254 change_to_root_user();
1255
1256 DEBUG(IS_IPC(conn)?3:1, ("%s (%s) closed connection to service %s\n",
1257 get_remote_machine_name(),
1258 conn->client_address,
1259 lp_servicename(SNUM(conn))));
1260
1261 /* Call VFS disconnect hook */
1262 SMB_VFS_DISCONNECT(conn);
1263
1264 yield_connection(conn, lp_servicename(SNUM(conn)));
1265
1266 /* make sure we leave the directory available for unmount */
1267 vfs_ChDir(conn, "/");
1268
1269 /* execute any "postexec = " line */
1270 if (*lp_postexec(SNUM(conn)) &&
1271 change_to_user(conn, vuid)) {
1272 char *cmd = talloc_sub_advanced(talloc_tos(),
1273 lp_servicename(SNUM(conn)),
1274 conn->server_info->unix_name,
1275 conn->connectpath,
1276 conn->server_info->utok.gid,
1277 conn->server_info->sanitized_username,
1278 pdb_get_domain(conn->server_info->sam_account),
1279 lp_postexec(SNUM(conn)));
1280 smbrun(cmd,NULL);
1281 TALLOC_FREE(cmd);
1282 change_to_root_user();
1283 }
1284
1285 change_to_root_user();
1286 /* execute any "root postexec = " line */
1287 if (*lp_rootpostexec(SNUM(conn))) {
1288 char *cmd = talloc_sub_advanced(talloc_tos(),
1289 lp_servicename(SNUM(conn)),
1290 conn->server_info->unix_name,
1291 conn->connectpath,
1292 conn->server_info->utok.gid,
1293 conn->server_info->sanitized_username,
1294 pdb_get_domain(conn->server_info->sam_account),
1295 lp_rootpostexec(SNUM(conn)));
1296 smbrun(cmd,NULL);
1297 TALLOC_FREE(cmd);
1298 }
1299
1300 conn_free(conn);
1301 }
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