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Fix bug 7297 - smbd crashes with CUPS printers and no [printers] share defined.
[Samba/bb.git] / source3 / smbd / service.c
blob25e0eb10f8e6dd77bc925e5643167f53f853db72
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 TALLOC_FREE(conn->server_info);
750 conn->server_info = forced_serverinfo;
751
752 conn->force_user = True;
753 DEBUG(3,("Forced user %s\n", fuser));
754 }
755
756 /*
757 * If force group is true, then override
758 * any groupid stored for the connecting user.
759 */
760
761 if (*lp_force_group(snum)) {
762
763 status = find_forced_group(
764 conn->force_user, snum, conn->server_info->unix_name,
765 &conn->server_info->ptok->user_sids[1],
766 &conn->server_info->utok.gid);
767
768 if (!NT_STATUS_IS_OK(status)) {
769 conn_free(conn);
770 *pstatus = status;
771 return NULL;
772 }
773
774 /*
775 * We need to cache this gid, to use within
776 * change_to_user() separately from the conn->server_info
777 * struct. We only use conn->server_info directly if
778 * "force_user" was set.
779 */
780 conn->force_group_gid = conn->server_info->utok.gid;
781 }
782
783 conn->vuid = (vuser != NULL) ? vuser->vuid : UID_FIELD_INVALID;
784
785 {
786 char *s = talloc_sub_advanced(talloc_tos(),
787 lp_servicename(SNUM(conn)),
788 conn->server_info->unix_name,
789 conn->connectpath,
790 conn->server_info->utok.gid,
791 conn->server_info->sanitized_username,
792 pdb_get_domain(conn->server_info->sam_account),
793 lp_pathname(snum));
794 if (!s) {
795 conn_free(conn);
796 *pstatus = NT_STATUS_NO_MEMORY;
797 return NULL;
798 }
799
800 if (!set_conn_connectpath(conn,s)) {
801 TALLOC_FREE(s);
802 conn_free(conn);
803 *pstatus = NT_STATUS_NO_MEMORY;
804 return NULL;
805 }
806 DEBUG(3,("Connect path is '%s' for service [%s]\n",s,
807 lp_servicename(snum)));
808 TALLOC_FREE(s);
809 }
810
811 /*
812 * New code to check if there's a share security descripter
813 * added from NT server manager. This is done after the
814 * smb.conf checks are done as we need a uid and token. JRA.
815 *
816 */
817
818 {
819 bool can_write = False;
820
821 can_write = share_access_check(conn->server_info->ptok,
822 lp_servicename(snum),
823 FILE_WRITE_DATA);
824
825 if (!can_write) {
826 if (!share_access_check(conn->server_info->ptok,
827 lp_servicename(snum),
828 FILE_READ_DATA)) {
829 /* No access, read or write. */
830 DEBUG(0,("make_connection: connection to %s "
831 "denied due to security "
832 "descriptor.\n",
833 lp_servicename(snum)));
834 conn_free(conn);
835 *pstatus = NT_STATUS_ACCESS_DENIED;
836 return NULL;
837 } else {
838 conn->read_only = True;
839 }
840 }
841 }
842 /* Initialise VFS function pointers */
843
844 if (!smbd_vfs_init(conn)) {
845 DEBUG(0, ("vfs_init failed for service %s\n",
846 lp_servicename(snum)));
847 conn_free(conn);
848 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
849 return NULL;
850 }
851
852 if ((!conn->printer) && (!conn->ipc)) {
853 conn->notify_ctx = notify_init(conn, server_id_self(),
854 smbd_messaging_context(),
855 smbd_event_context(),
856 conn);
857 }
858
859 /* ROOT Activities: */
860 /* explicitly check widelinks here so that we can correctly warn
861 * in the logs. */
862 widelinks_warning(snum);
863
864 /*
865 * Enforce the max connections parameter.
866 */
867
868 if ((lp_max_connections(snum) > 0)
869 && (count_current_connections(lp_servicename(SNUM(conn)), True) >=
870 lp_max_connections(snum))) {
871
872 DEBUG(1, ("Max connections (%d) exceeded for %s\n",
873 lp_max_connections(snum), lp_servicename(snum)));
874 conn_free(conn);
875 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
876 return NULL;
877 }
878
879 /*
880 * Get us an entry in the connections db
881 */
882 if (!claim_connection(conn, lp_servicename(snum), 0)) {
883 DEBUG(1, ("Could not store connections entry\n"));
884 conn_free(conn);
885 *pstatus = NT_STATUS_INTERNAL_DB_ERROR;
886 return NULL;
887 }
888
889 /* Invoke VFS make connection hook - must be the first
890 VFS operation we do. */
891
892 if (SMB_VFS_CONNECT(conn, lp_servicename(snum),
893 conn->server_info->unix_name) < 0) {
894 DEBUG(0,("make_connection: VFS make connection failed!\n"));
895 yield_connection(conn, lp_servicename(snum));
896 conn_free(conn);
897 *pstatus = NT_STATUS_UNSUCCESSFUL;
898 return NULL;
899 }
900
901 /*
902 * Fix compatibility issue pointed out by Volker.
903 * We pass the conn->connectpath to the preexec
904 * scripts as a parameter, so attempt to canonicalize
905 * it here before calling the preexec scripts.
906 * We ignore errors here, as it is possible that
907 * the conn->connectpath doesn't exist yet and
908 * the preexec scripts will create them.
909 */
910
911 (void)canonicalize_connect_path(conn);
912
913 /* Preexecs are done here as they might make the dir we are to ChDir
914 * to below */
915 /* execute any "root preexec = " line */
916 if (*lp_rootpreexec(snum)) {
917 char *cmd = talloc_sub_advanced(talloc_tos(),
918 lp_servicename(SNUM(conn)),
919 conn->server_info->unix_name,
920 conn->connectpath,
921 conn->server_info->utok.gid,
922 conn->server_info->sanitized_username,
923 pdb_get_domain(conn->server_info->sam_account),
924 lp_rootpreexec(snum));
925 DEBUG(5,("cmd=%s\n",cmd));
926 ret = smbrun(cmd,NULL);
927 TALLOC_FREE(cmd);
928 if (ret != 0 && lp_rootpreexec_close(snum)) {
929 DEBUG(1,("root preexec gave %d - failing "
930 "connection\n", ret));
931 SMB_VFS_DISCONNECT(conn);
932 yield_connection(conn, lp_servicename(snum));
933 conn_free(conn);
934 *pstatus = NT_STATUS_ACCESS_DENIED;
935 return NULL;
936 }
937 }
938
939 /* USER Activites: */
940 if (!change_to_user(conn, conn->vuid)) {
941 /* No point continuing if they fail the basic checks */
942 DEBUG(0,("Can't become connected user!\n"));
943 SMB_VFS_DISCONNECT(conn);
944 yield_connection(conn, lp_servicename(snum));
945 conn_free(conn);
946 *pstatus = NT_STATUS_LOGON_FAILURE;
947 return NULL;
948 }
949
950 /* Remember that a different vuid can connect later without these
951 * checks... */
952
953 /* Preexecs are done here as they might make the dir we are to ChDir
954 * to below */
955
956 /* execute any "preexec = " line */
957 if (*lp_preexec(snum)) {
958 char *cmd = talloc_sub_advanced(talloc_tos(),
959 lp_servicename(SNUM(conn)),
960 conn->server_info->unix_name,
961 conn->connectpath,
962 conn->server_info->utok.gid,
963 conn->server_info->sanitized_username,
964 pdb_get_domain(conn->server_info->sam_account),
965 lp_preexec(snum));
966 ret = smbrun(cmd,NULL);
967 TALLOC_FREE(cmd);
968 if (ret != 0 && lp_preexec_close(snum)) {
969 DEBUG(1,("preexec gave %d - failing connection\n",
970 ret));
971 *pstatus = NT_STATUS_ACCESS_DENIED;
972 goto err_root_exit;
973 }
974 }
975
976 /*
977 * If widelinks are disallowed we need to canonicalise the connect
978 * path here to ensure we don't have any symlinks in the
979 * connectpath. We will be checking all paths on this connection are
980 * below this directory. We must do this after the VFS init as we
981 * depend on the realpath() pointer in the vfs table. JRA.
982 */
983 if (!lp_widelinks(snum)) {
984 if (!canonicalize_connect_path(conn)) {
985 DEBUG(0, ("canonicalize_connect_path failed "
986 "for service %s, path %s\n",
987 lp_servicename(snum),
988 conn->connectpath));
989 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
990 goto err_root_exit;
991 }
992 }
993
994 #ifdef WITH_FAKE_KASERVER
995 if (lp_afs_share(snum)) {
996 afs_login(conn);
997 }
998 #endif
999
1000 /* Add veto/hide lists */
1001 if (!IS_IPC(conn) && !IS_PRINT(conn)) {
1002 set_namearray( &conn->veto_list, lp_veto_files(snum));
1003 set_namearray( &conn->hide_list, lp_hide_files(snum));
1004 set_namearray( &conn->veto_oplock_list, lp_veto_oplocks(snum));
1005 set_namearray( &conn->aio_write_behind_list,
1006 lp_aio_write_behind(snum));
1007 }
1008
1009 status = create_synthetic_smb_fname(talloc_tos(), conn->connectpath,
1010 NULL, NULL, &smb_fname_cpath);
1011 if (!NT_STATUS_IS_OK(status)) {
1012 *pstatus = status;
1013 goto err_root_exit;
1014 }
1015
1016 /* win2000 does not check the permissions on the directory
1017 during the tree connect, instead relying on permission
1018 check during individual operations. To match this behaviour
1019 I have disabled this chdir check (tridge) */
1020 /* the alternative is just to check the directory exists */
1021 if ((ret = SMB_VFS_STAT(conn, smb_fname_cpath)) != 0 ||
1022 !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
1023 if (ret == 0 && !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
1024 DEBUG(0,("'%s' is not a directory, when connecting to "
1025 "[%s]\n", conn->connectpath,
1026 lp_servicename(snum)));
1027 } else {
1028 DEBUG(0,("'%s' does not exist or permission denied "
1029 "when connecting to [%s] Error was %s\n",
1030 conn->connectpath, lp_servicename(snum),
1031 strerror(errno) ));
1032 }
1033 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
1034 goto err_root_exit;
1035 }
1036
1037 string_set(&conn->origpath,conn->connectpath);
1038
1039 #if SOFTLINK_OPTIMISATION
1040 /* resolve any soft links early if possible */
1041 if (vfs_ChDir(conn,conn->connectpath) == 0) {
1042 TALLOC_CTX *ctx = talloc_tos();
1043 char *s = vfs_GetWd(ctx,s);
1044 if (!s) {
1045 *status = map_nt_error_from_unix(errno);
1046 goto err_root_exit;
1047 }
1048 if (!set_conn_connectpath(conn,s)) {
1049 *status = NT_STATUS_NO_MEMORY;
1050 goto err_root_exit;
1051 }
1052 vfs_ChDir(conn,conn->connectpath);
1053 }
1054 #endif
1055
1056 /* Figure out the characteristics of the underlying filesystem. This
1057 * assumes that all the filesystem mounted withing a share path have
1058 * the same characteristics, which is likely but not guaranteed.
1059 */
1060
1061 conn->fs_capabilities = SMB_VFS_FS_CAPABILITIES(conn, &conn->ts_res);
1062
1063 /*
1064 * Print out the 'connected as' stuff here as we need
1065 * to know the effective uid and gid we will be using
1066 * (at least initially).
1067 */
1068
1069 if( DEBUGLVL( IS_IPC(conn) ? 3 : 1 ) ) {
1070 dbgtext( "%s (%s) ", get_remote_machine_name(),
1071 conn->client_address );
1072 dbgtext( "%s", srv_is_signing_active(smbd_server_conn) ? "signed " : "");
1073 dbgtext( "connect to service %s ", lp_servicename(snum) );
1074 dbgtext( "initially as user %s ",
1075 conn->server_info->unix_name );
1076 dbgtext( "(uid=%d, gid=%d) ", (int)geteuid(), (int)getegid() );
1077 dbgtext( "(pid %d)\n", (int)sys_getpid() );
1078 }
1079
1080 /* we've finished with the user stuff - go back to root */
1081 change_to_root_user();
1082 return(conn);
1083
1084 err_root_exit:
1085 TALLOC_FREE(smb_fname_cpath);
1086 change_to_root_user();
1087 /* Call VFS disconnect hook */
1088 SMB_VFS_DISCONNECT(conn);
1089 yield_connection(conn, lp_servicename(snum));
1090 conn_free(conn);
1091 return NULL;
1092 }
1093
1094 /****************************************************************************
1095 Make a connection to a service.
1096 *
1097 * @param service
1098 ****************************************************************************/
1099
1100 connection_struct *make_connection(struct smbd_server_connection *sconn,
1101 const char *service_in, DATA_BLOB password,
1102 const char *pdev, uint16 vuid,
1103 NTSTATUS *status)
1104 {
1105 uid_t euid;
1106 user_struct *vuser = NULL;
1107 fstring service;
1108 fstring dev;
1109 int snum = -1;
1110 char addr[INET6_ADDRSTRLEN];
1111
1112 fstrcpy(dev, pdev);
1113
1114 /* This must ONLY BE CALLED AS ROOT. As it exits this function as
1115 * root. */
1116 if (!non_root_mode() && (euid = geteuid()) != 0) {
1117 DEBUG(0,("make_connection: PANIC ERROR. Called as nonroot "
1118 "(%u)\n", (unsigned int)euid ));
1119 smb_panic("make_connection: PANIC ERROR. Called as nonroot\n");
1120 }
1121
1122 if (conn_num_open(sconn) > 2047) {
1123 *status = NT_STATUS_INSUFF_SERVER_RESOURCES;
1124 return NULL;
1125 }
1126
1127 if(lp_security() != SEC_SHARE) {
1128 vuser = get_valid_user_struct(sconn, vuid);
1129 if (!vuser) {
1130 DEBUG(1,("make_connection: refusing to connect with "
1131 "no session setup\n"));
1132 *status = NT_STATUS_ACCESS_DENIED;
1133 return NULL;
1134 }
1135 }
1136
1137 /* Logic to try and connect to the correct [homes] share, preferably
1138 without too many getpwnam() lookups. This is particulary nasty for
1139 winbind usernames, where the share name isn't the same as unix
1140 username.
1141
1142 The snum of the homes share is stored on the vuser at session setup
1143 time.
1144 */
1145
1146 if (strequal(service_in,HOMES_NAME)) {
1147 if(lp_security() != SEC_SHARE) {
1148 DATA_BLOB no_pw = data_blob_null;
1149 if (vuser->homes_snum == -1) {
1150 DEBUG(2, ("[homes] share not available for "
1151 "this user because it was not found "
1152 "or created at session setup "
1153 "time\n"));
1154 *status = NT_STATUS_BAD_NETWORK_NAME;
1155 return NULL;
1156 }
1157 DEBUG(5, ("making a connection to [homes] service "
1158 "created at session setup time\n"));
1159 return make_connection_snum(sconn,
1160 vuser->homes_snum,
1161 vuser, no_pw,
1162 dev, status);
1163 } else {
1164 /* Security = share. Try with
1165 * current_user_info.smb_name as the username. */
1166 if (*current_user_info.smb_name) {
1167 fstring unix_username;
1168 fstrcpy(unix_username,
1169 current_user_info.smb_name);
1170 map_username(sconn, unix_username);
1171 snum = find_service(unix_username);
1172 }
1173 if (snum != -1) {
1174 DEBUG(5, ("making a connection to 'homes' "
1175 "service %s based on "
1176 "security=share\n", service_in));
1177 return make_connection_snum(sconn,
1178 snum, NULL,
1179 password,
1180 dev, status);
1181 }
1182 }
1183 } else if ((lp_security() != SEC_SHARE) && (vuser->homes_snum != -1)
1184 && strequal(service_in,
1185 lp_servicename(vuser->homes_snum))) {
1186 DATA_BLOB no_pw = data_blob_null;
1187 DEBUG(5, ("making a connection to 'homes' service [%s] "
1188 "created at session setup time\n", service_in));
1189 return make_connection_snum(sconn,
1190 vuser->homes_snum,
1191 vuser, no_pw,
1192 dev, status);
1193 }
1194
1195 fstrcpy(service, service_in);
1196
1197 strlower_m(service);
1198
1199 snum = find_service(service);
1200
1201 if (snum < 0) {
1202 if (strequal(service,"IPC$") ||
1203 (lp_enable_asu_support() && strequal(service,"ADMIN$"))) {
1204 DEBUG(3,("refusing IPC connection to %s\n", service));
1205 *status = NT_STATUS_ACCESS_DENIED;
1206 return NULL;
1207 }
1208
1209 DEBUG(3,("%s (%s) couldn't find service %s\n",
1210 get_remote_machine_name(),
1211 client_addr(get_client_fd(),addr,sizeof(addr)),
1212 service));
1213 *status = NT_STATUS_BAD_NETWORK_NAME;
1214 return NULL;
1215 }
1216
1217 /* Handle non-Dfs clients attempting connections to msdfs proxy */
1218 if (lp_host_msdfs() && (*lp_msdfs_proxy(snum) != '\0')) {
1219 DEBUG(3, ("refusing connection to dfs proxy share '%s' "
1220 "(pointing to %s)\n",
1221 service, lp_msdfs_proxy(snum)));
1222 *status = NT_STATUS_BAD_NETWORK_NAME;
1223 return NULL;
1224 }
1225
1226 DEBUG(5, ("making a connection to 'normal' service %s\n", service));
1227
1228 return make_connection_snum(sconn, snum, vuser,
1229 password,
1230 dev, status);
1231 }
1232
1233 /****************************************************************************
1234 Close a cnum.
1235 ****************************************************************************/
1236
1237 void close_cnum(connection_struct *conn, uint16 vuid)
1238 {
1239 file_close_conn(conn);
1240
1241 if (!IS_IPC(conn)) {
1242 dptr_closecnum(conn);
1243 }
1244
1245 change_to_root_user();
1246
1247 DEBUG(IS_IPC(conn)?3:1, ("%s (%s) closed connection to service %s\n",
1248 get_remote_machine_name(),
1249 conn->client_address,
1250 lp_servicename(SNUM(conn))));
1251
1252 /* Call VFS disconnect hook */
1253 SMB_VFS_DISCONNECT(conn);
1254
1255 yield_connection(conn, lp_servicename(SNUM(conn)));
1256
1257 /* make sure we leave the directory available for unmount */
1258 vfs_ChDir(conn, "/");
1259
1260 /* execute any "postexec = " line */
1261 if (*lp_postexec(SNUM(conn)) &&
1262 change_to_user(conn, vuid)) {
1263 char *cmd = talloc_sub_advanced(talloc_tos(),
1264 lp_servicename(SNUM(conn)),
1265 conn->server_info->unix_name,
1266 conn->connectpath,
1267 conn->server_info->utok.gid,
1268 conn->server_info->sanitized_username,
1269 pdb_get_domain(conn->server_info->sam_account),
1270 lp_postexec(SNUM(conn)));
1271 smbrun(cmd,NULL);
1272 TALLOC_FREE(cmd);
1273 change_to_root_user();
1274 }
1275
1276 change_to_root_user();
1277 /* execute any "root postexec = " line */
1278 if (*lp_rootpostexec(SNUM(conn))) {
1279 char *cmd = talloc_sub_advanced(talloc_tos(),
1280 lp_servicename(SNUM(conn)),
1281 conn->server_info->unix_name,
1282 conn->connectpath,
1283 conn->server_info->utok.gid,
1284 conn->server_info->sanitized_username,
1285 pdb_get_domain(conn->server_info->sam_account),
1286 lp_rootpostexec(SNUM(conn)));
1287 smbrun(cmd,NULL);
1288 TALLOC_FREE(cmd);
1289 }
1290
1291 conn_free(conn);
1292 }