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libutil: Remove obsolete signal type cast.
[Samba/nascimento.git] / source3 / smbd / service.c
blob4bc5ca1a5cfd60e93d4368af648a006c8d9518d1
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 = (char *)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) {
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 = NULL;
651 struct smb_filename *smb_fname_cpath = NULL;
652 fstring dev;
653 int ret;
654 char addr[INET6_ADDRSTRLEN];
655 bool on_err_call_dis_hook = false;
656 bool claimed_connection = false;
657 uid_t effuid;
658 gid_t effgid;
659 NTSTATUS status;
660
661 fstrcpy(dev, pdev);
662
663 if (NT_STATUS_IS_ERR(*pstatus = share_sanity_checks(snum, dev))) {
664 goto err_root_exit;
665 }
666
667 conn = conn_new(sconn);
668 if (!conn) {
669 DEBUG(0,("Couldn't find free connection.\n"));
670 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
671 goto err_root_exit;
672 }
673
674 conn->params->service = snum;
675
676 status = create_connection_server_info(sconn,
677 conn, snum, vuser ? vuser->server_info : NULL, password,
678 &conn->server_info);
679
680 if (!NT_STATUS_IS_OK(status)) {
681 DEBUG(1, ("create_connection_server_info failed: %s\n",
682 nt_errstr(status)));
683 *pstatus = status;
684 goto err_root_exit;
685 }
686
687 if ((lp_guest_only(snum)) || (lp_security() == SEC_SHARE)) {
688 conn->force_user = true;
689 }
690
691 add_session_user(sconn, conn->server_info->unix_name);
692
693 safe_strcpy(conn->client_address,
694 client_addr(get_client_fd(),addr,sizeof(addr)),
695 sizeof(conn->client_address)-1);
696 conn->num_files_open = 0;
697 conn->lastused = conn->lastused_count = time(NULL);
698 conn->used = True;
699 conn->printer = (strncmp(dev,"LPT",3) == 0);
700 conn->ipc = ( (strncmp(dev,"IPC",3) == 0) ||
701 ( lp_enable_asu_support() && strequal(dev,"ADMIN$")) );
702
703 /* Case options for the share. */
704 if (lp_casesensitive(snum) == Auto) {
705 /* We will be setting this per packet. Set to be case
706 * insensitive for now. */
707 conn->case_sensitive = False;
708 } else {
709 conn->case_sensitive = (bool)lp_casesensitive(snum);
710 }
711
712 conn->case_preserve = lp_preservecase(snum);
713 conn->short_case_preserve = lp_shortpreservecase(snum);
714
715 conn->encrypt_level = lp_smb_encrypt(snum);
716
717 conn->veto_list = NULL;
718 conn->hide_list = NULL;
719 conn->veto_oplock_list = NULL;
720 conn->aio_write_behind_list = NULL;
721
722 conn->read_only = lp_readonly(SNUM(conn));
723 conn->admin_user = False;
724
725 if (*lp_force_user(snum)) {
726
727 /*
728 * Replace conn->server_info with a completely faked up one
729 * from the username we are forced into :-)
730 */
731
732 char *fuser;
733 struct auth_serversupplied_info *forced_serverinfo;
734
735 fuser = talloc_string_sub(conn, lp_force_user(snum), "%S",
736 lp_servicename(snum));
737 if (fuser == NULL) {
738 *pstatus = NT_STATUS_NO_MEMORY;
739 goto err_root_exit;
740 }
741
742 status = make_serverinfo_from_username(
743 conn, fuser, conn->server_info->guest,
744 &forced_serverinfo);
745 if (!NT_STATUS_IS_OK(status)) {
746 *pstatus = status;
747 goto err_root_exit;
748 }
749
750 TALLOC_FREE(conn->server_info);
751 conn->server_info = forced_serverinfo;
752
753 conn->force_user = True;
754 DEBUG(3,("Forced user %s\n", fuser));
755 }
756
757 /*
758 * If force group is true, then override
759 * any groupid stored for the connecting user.
760 */
761
762 if (*lp_force_group(snum)) {
763
764 status = find_forced_group(
765 conn->force_user, snum, conn->server_info->unix_name,
766 &conn->server_info->ptok->user_sids[1],
767 &conn->server_info->utok.gid);
768
769 if (!NT_STATUS_IS_OK(status)) {
770 *pstatus = status;
771 goto err_root_exit;
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 *pstatus = NT_STATUS_NO_MEMORY;
796 goto err_root_exit;
797 }
798
799 if (!set_conn_connectpath(conn,s)) {
800 TALLOC_FREE(s);
801 *pstatus = NT_STATUS_NO_MEMORY;
802 goto err_root_exit;
803 }
804 DEBUG(3,("Connect path is '%s' for service [%s]\n",s,
805 lp_servicename(snum)));
806 TALLOC_FREE(s);
807 }
808
809 /*
810 * New code to check if there's a share security descripter
811 * added from NT server manager. This is done after the
812 * smb.conf checks are done as we need a uid and token. JRA.
813 *
814 */
815
816 {
817 bool can_write = False;
818
819 can_write = share_access_check(conn->server_info->ptok,
820 lp_servicename(snum),
821 FILE_WRITE_DATA);
822
823 if (!can_write) {
824 if (!share_access_check(conn->server_info->ptok,
825 lp_servicename(snum),
826 FILE_READ_DATA)) {
827 /* No access, read or write. */
828 DEBUG(0,("make_connection: connection to %s "
829 "denied due to security "
830 "descriptor.\n",
831 lp_servicename(snum)));
832 *pstatus = NT_STATUS_ACCESS_DENIED;
833 goto err_root_exit;
834 } else {
835 conn->read_only = True;
836 }
837 }
838 }
839 /* Initialise VFS function pointers */
840
841 if (!smbd_vfs_init(conn)) {
842 DEBUG(0, ("vfs_init failed for service %s\n",
843 lp_servicename(snum)));
844 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
845 goto err_root_exit;
846 }
847
848 /* ROOT Activities: */
849 /* explicitly check widelinks here so that we can correctly warn
850 * in the logs. */
851 widelinks_warning(snum);
852
853 /*
854 * Enforce the max connections parameter.
855 */
856
857 if ((lp_max_connections(snum) > 0)
858 && (count_current_connections(lp_servicename(SNUM(conn)), True) >=
859 lp_max_connections(snum))) {
860
861 DEBUG(1, ("Max connections (%d) exceeded for %s\n",
862 lp_max_connections(snum), lp_servicename(snum)));
863 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
864 goto err_root_exit;
865 }
866
867 /*
868 * Get us an entry in the connections db
869 */
870 if (!claim_connection(conn, lp_servicename(snum), 0)) {
871 DEBUG(1, ("Could not store connections entry\n"));
872 *pstatus = NT_STATUS_INTERNAL_DB_ERROR;
873 goto err_root_exit;
874 }
875 claimed_connection = true;
876
877 /* Invoke VFS make connection hook - this must be the first
878 filesystem operation that we do. */
879
880 if (SMB_VFS_CONNECT(conn, lp_servicename(snum),
881 conn->server_info->unix_name) < 0) {
882 DEBUG(0,("make_connection: VFS make connection failed!\n"));
883 *pstatus = NT_STATUS_UNSUCCESSFUL;
884 goto err_root_exit;
885 }
886
887 /* Any error exit after here needs to call the disconnect hook. */
888 on_err_call_dis_hook = true;
889
890 if ((!conn->printer) && (!conn->ipc)) {
891 conn->notify_ctx = notify_init(conn, server_id_self(),
892 smbd_messaging_context(),
893 smbd_event_context(),
894 conn);
895 }
896
897 /*
898 * Fix compatibility issue pointed out by Volker.
899 * We pass the conn->connectpath to the preexec
900 * scripts as a parameter, so attempt to canonicalize
901 * it here before calling the preexec scripts.
902 * We ignore errors here, as it is possible that
903 * the conn->connectpath doesn't exist yet and
904 * the preexec scripts will create them.
905 */
906
907 (void)canonicalize_connect_path(conn);
908
909 /* Preexecs are done here as they might make the dir we are to ChDir
910 * to below */
911 /* execute any "root preexec = " line */
912 if (*lp_rootpreexec(snum)) {
913 char *cmd = talloc_sub_advanced(talloc_tos(),
914 lp_servicename(SNUM(conn)),
915 conn->server_info->unix_name,
916 conn->connectpath,
917 conn->server_info->utok.gid,
918 conn->server_info->sanitized_username,
919 pdb_get_domain(conn->server_info->sam_account),
920 lp_rootpreexec(snum));
921 DEBUG(5,("cmd=%s\n",cmd));
922 ret = smbrun(cmd,NULL);
923 TALLOC_FREE(cmd);
924 if (ret != 0 && lp_rootpreexec_close(snum)) {
925 DEBUG(1,("root preexec gave %d - failing "
926 "connection\n", ret));
927 *pstatus = NT_STATUS_ACCESS_DENIED;
928 goto err_root_exit;
929 }
930 }
931
932 /* USER Activites: */
933 if (!change_to_user(conn, conn->vuid)) {
934 /* No point continuing if they fail the basic checks */
935 DEBUG(0,("Can't become connected user!\n"));
936 *pstatus = NT_STATUS_LOGON_FAILURE;
937 goto err_root_exit;
938 }
939
940 effuid = geteuid();
941 effgid = getegid();
942
943 /* Remember that a different vuid can connect later without these
944 * checks... */
945
946 /* Preexecs are done here as they might make the dir we are to ChDir
947 * to below */
948
949 /* execute any "preexec = " line */
950 if (*lp_preexec(snum)) {
951 char *cmd = talloc_sub_advanced(talloc_tos(),
952 lp_servicename(SNUM(conn)),
953 conn->server_info->unix_name,
954 conn->connectpath,
955 conn->server_info->utok.gid,
956 conn->server_info->sanitized_username,
957 pdb_get_domain(conn->server_info->sam_account),
958 lp_preexec(snum));
959 ret = smbrun(cmd,NULL);
960 TALLOC_FREE(cmd);
961 if (ret != 0 && lp_preexec_close(snum)) {
962 DEBUG(1,("preexec gave %d - failing connection\n",
963 ret));
964 *pstatus = NT_STATUS_ACCESS_DENIED;
965 goto err_root_exit;
966 }
967 }
968
969 #ifdef WITH_FAKE_KASERVER
970 if (lp_afs_share(snum)) {
971 afs_login(conn);
972 }
973 #endif
974
975 /*
976 * we've finished with the user stuff - go back to root
977 * so the SMB_VFS_STAT call will only fail on path errors,
978 * not permission problems.
979 */
980 change_to_root_user();
981 /* ROOT Activites: */
982
983 /*
984 * If widelinks are disallowed we need to canonicalise the connect
985 * path here to ensure we don't have any symlinks in the
986 * connectpath. We will be checking all paths on this connection are
987 * below this directory. We must do this after the VFS init as we
988 * depend on the realpath() pointer in the vfs table. JRA.
989 */
990 if (!lp_widelinks(snum)) {
991 if (!canonicalize_connect_path(conn)) {
992 DEBUG(0, ("canonicalize_connect_path failed "
993 "for service %s, path %s\n",
994 lp_servicename(snum),
995 conn->connectpath));
996 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
997 goto err_root_exit;
998 }
999 }
1000
1001 /* Add veto/hide lists */
1002 if (!IS_IPC(conn) && !IS_PRINT(conn)) {
1003 set_namearray( &conn->veto_list, lp_veto_files(snum));
1004 set_namearray( &conn->hide_list, lp_hide_files(snum));
1005 set_namearray( &conn->veto_oplock_list, lp_veto_oplocks(snum));
1006 set_namearray( &conn->aio_write_behind_list,
1007 lp_aio_write_behind(snum));
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
1022 if ((ret = SMB_VFS_STAT(conn, smb_fname_cpath)) != 0 ||
1023 !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
1024 if (ret == 0 && !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
1025 DEBUG(0,("'%s' is not a directory, when connecting to "
1026 "[%s]\n", conn->connectpath,
1027 lp_servicename(snum)));
1028 } else {
1029 DEBUG(0,("'%s' does not exist or permission denied "
1030 "when connecting to [%s] Error was %s\n",
1031 conn->connectpath, lp_servicename(snum),
1032 strerror(errno) ));
1033 }
1034 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
1035 goto err_root_exit;
1036 }
1037
1038 string_set(&conn->origpath,conn->connectpath);
1039
1040 /* Figure out the characteristics of the underlying filesystem. This
1041 * assumes that all the filesystem mounted withing a share path have
1042 * the same characteristics, which is likely but not guaranteed.
1043 */
1044
1045 conn->fs_capabilities = SMB_VFS_FS_CAPABILITIES(conn, &conn->ts_res);
1046
1047 /*
1048 * Print out the 'connected as' stuff here as we need
1049 * to know the effective uid and gid we will be using
1050 * (at least initially).
1051 */
1052
1053 if( DEBUGLVL( IS_IPC(conn) ? 3 : 1 ) ) {
1054 dbgtext( "%s (%s) ", get_remote_machine_name(),
1055 conn->client_address );
1056 dbgtext( "%s", srv_is_signing_active(smbd_server_conn) ? "signed " : "");
1057 dbgtext( "connect to service %s ", lp_servicename(snum) );
1058 dbgtext( "initially as user %s ",
1059 conn->server_info->unix_name );
1060 dbgtext( "(uid=%d, gid=%d) ", (int)effuid, (int)effgid );
1061 dbgtext( "(pid %d)\n", (int)sys_getpid() );
1062 }
1063
1064 return(conn);
1065
1066 err_root_exit:
1067 TALLOC_FREE(smb_fname_cpath);
1068 /* We must exit this function as root. */
1069 if (geteuid() != 0) {
1070 change_to_root_user();
1071 }
1072 if (on_err_call_dis_hook) {
1073 /* Call VFS disconnect hook */
1074 SMB_VFS_DISCONNECT(conn);
1075 }
1076 if (claimed_connection) {
1077 yield_connection(conn, lp_servicename(snum));
1078 }
1079 if (conn) {
1080 conn_free(conn);
1081 }
1082 return NULL;
1083 }
1084
1085 /****************************************************************************
1086 Make a connection to a service.
1087 *
1088 * @param service
1089 ****************************************************************************/
1090
1091 connection_struct *make_connection(struct smbd_server_connection *sconn,
1092 const char *service_in, DATA_BLOB password,
1093 const char *pdev, uint16 vuid,
1094 NTSTATUS *status)
1095 {
1096 uid_t euid;
1097 user_struct *vuser = NULL;
1098 fstring service;
1099 fstring dev;
1100 int snum = -1;
1101 char addr[INET6_ADDRSTRLEN];
1102
1103 fstrcpy(dev, pdev);
1104
1105 /* This must ONLY BE CALLED AS ROOT. As it exits this function as
1106 * root. */
1107 if (!non_root_mode() && (euid = geteuid()) != 0) {
1108 DEBUG(0,("make_connection: PANIC ERROR. Called as nonroot "
1109 "(%u)\n", (unsigned int)euid ));
1110 smb_panic("make_connection: PANIC ERROR. Called as nonroot\n");
1111 }
1112
1113 if (conn_num_open(sconn) > 2047) {
1114 *status = NT_STATUS_INSUFF_SERVER_RESOURCES;
1115 return NULL;
1116 }
1117
1118 if(lp_security() != SEC_SHARE) {
1119 vuser = get_valid_user_struct(sconn, vuid);
1120 if (!vuser) {
1121 DEBUG(1,("make_connection: refusing to connect with "
1122 "no session setup\n"));
1123 *status = NT_STATUS_ACCESS_DENIED;
1124 return NULL;
1125 }
1126 }
1127
1128 /* Logic to try and connect to the correct [homes] share, preferably
1129 without too many getpwnam() lookups. This is particulary nasty for
1130 winbind usernames, where the share name isn't the same as unix
1131 username.
1132
1133 The snum of the homes share is stored on the vuser at session setup
1134 time.
1135 */
1136
1137 if (strequal(service_in,HOMES_NAME)) {
1138 if(lp_security() != SEC_SHARE) {
1139 DATA_BLOB no_pw = data_blob_null;
1140 if (vuser->homes_snum == -1) {
1141 DEBUG(2, ("[homes] share not available for "
1142 "this user because it was not found "
1143 "or created at session setup "
1144 "time\n"));
1145 *status = NT_STATUS_BAD_NETWORK_NAME;
1146 return NULL;
1147 }
1148 DEBUG(5, ("making a connection to [homes] service "
1149 "created at session setup time\n"));
1150 return make_connection_snum(sconn,
1151 vuser->homes_snum,
1152 vuser, no_pw,
1153 dev, status);
1154 } else {
1155 /* Security = share. Try with
1156 * current_user_info.smb_name as the username. */
1157 if (*current_user_info.smb_name) {
1158 fstring unix_username;
1159 fstrcpy(unix_username,
1160 current_user_info.smb_name);
1161 map_username(sconn, unix_username);
1162 snum = find_service(unix_username);
1163 }
1164 if (snum != -1) {
1165 DEBUG(5, ("making a connection to 'homes' "
1166 "service %s based on "
1167 "security=share\n", service_in));
1168 return make_connection_snum(sconn,
1169 snum, NULL,
1170 password,
1171 dev, status);
1172 }
1173 }
1174 } else if ((lp_security() != SEC_SHARE) && (vuser->homes_snum != -1)
1175 && strequal(service_in,
1176 lp_servicename(vuser->homes_snum))) {
1177 DATA_BLOB no_pw = data_blob_null;
1178 DEBUG(5, ("making a connection to 'homes' service [%s] "
1179 "created at session setup time\n", service_in));
1180 return make_connection_snum(sconn,
1181 vuser->homes_snum,
1182 vuser, no_pw,
1183 dev, status);
1184 }
1185
1186 fstrcpy(service, service_in);
1187
1188 strlower_m(service);
1189
1190 snum = find_service(service);
1191
1192 if (snum < 0) {
1193 if (strequal(service,"IPC$") ||
1194 (lp_enable_asu_support() && strequal(service,"ADMIN$"))) {
1195 DEBUG(3,("refusing IPC connection to %s\n", service));
1196 *status = NT_STATUS_ACCESS_DENIED;
1197 return NULL;
1198 }
1199
1200 DEBUG(3,("%s (%s) couldn't find service %s\n",
1201 get_remote_machine_name(),
1202 client_addr(get_client_fd(),addr,sizeof(addr)),
1203 service));
1204 *status = NT_STATUS_BAD_NETWORK_NAME;
1205 return NULL;
1206 }
1207
1208 /* Handle non-Dfs clients attempting connections to msdfs proxy */
1209 if (lp_host_msdfs() && (*lp_msdfs_proxy(snum) != '\0')) {
1210 DEBUG(3, ("refusing connection to dfs proxy share '%s' "
1211 "(pointing to %s)\n",
1212 service, lp_msdfs_proxy(snum)));
1213 *status = NT_STATUS_BAD_NETWORK_NAME;
1214 return NULL;
1215 }
1216
1217 DEBUG(5, ("making a connection to 'normal' service %s\n", service));
1218
1219 return make_connection_snum(sconn, snum, vuser,
1220 password,
1221 dev, status);
1222 }
1223
1224 /****************************************************************************
1225 Close a cnum.
1226 ****************************************************************************/
1227
1228 void close_cnum(connection_struct *conn, uint16 vuid)
1229 {
1230 file_close_conn(conn);
1231
1232 if (!IS_IPC(conn)) {
1233 dptr_closecnum(conn);
1234 }
1235
1236 change_to_root_user();
1237
1238 DEBUG(IS_IPC(conn)?3:1, ("%s (%s) closed connection to service %s\n",
1239 get_remote_machine_name(),
1240 conn->client_address,
1241 lp_servicename(SNUM(conn))));
1242
1243 /* Call VFS disconnect hook */
1244 SMB_VFS_DISCONNECT(conn);
1245
1246 yield_connection(conn, lp_servicename(SNUM(conn)));
1247
1248 /* make sure we leave the directory available for unmount */
1249 vfs_ChDir(conn, "/");
1250
1251 /* execute any "postexec = " line */
1252 if (*lp_postexec(SNUM(conn)) &&
1253 change_to_user(conn, vuid)) {
1254 char *cmd = talloc_sub_advanced(talloc_tos(),
1255 lp_servicename(SNUM(conn)),
1256 conn->server_info->unix_name,
1257 conn->connectpath,
1258 conn->server_info->utok.gid,
1259 conn->server_info->sanitized_username,
1260 pdb_get_domain(conn->server_info->sam_account),
1261 lp_postexec(SNUM(conn)));
1262 smbrun(cmd,NULL);
1263 TALLOC_FREE(cmd);
1264 change_to_root_user();
1265 }
1266
1267 change_to_root_user();
1268 /* execute any "root postexec = " line */
1269 if (*lp_rootpostexec(SNUM(conn))) {
1270 char *cmd = talloc_sub_advanced(talloc_tos(),
1271 lp_servicename(SNUM(conn)),
1272 conn->server_info->unix_name,
1273 conn->connectpath,
1274 conn->server_info->utok.gid,
1275 conn->server_info->sanitized_username,
1276 pdb_get_domain(conn->server_info->sam_account),
1277 lp_rootpostexec(SNUM(conn)));
1278 smbrun(cmd,NULL);
1279 TALLOC_FREE(cmd);
1280 }
1281
1282 conn_free(conn);
1283 }