?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Suplementary patch for bug #7104 - "wide links" and "unix extensions" are incompatible.
[Samba.git] / source3 / smbd / service.c
blob9d3da8352ace1a1201e59742988e8f5c8301b67e
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) {
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 bool on_err_call_dis_hook = false;
656 NTSTATUS status;
657
658 fstrcpy(dev, pdev);
659
660 if (NT_STATUS_IS_ERR(*pstatus = share_sanity_checks(snum, dev))) {
661 return NULL;
662 }
663
664 conn = conn_new(sconn);
665 if (!conn) {
666 DEBUG(0,("Couldn't find free connection.\n"));
667 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
668 return NULL;
669 }
670
671 conn->params->service = snum;
672
673 status = create_connection_server_info(sconn,
674 conn, snum, vuser ? vuser->server_info : NULL, password,
675 &conn->server_info);
676
677 if (!NT_STATUS_IS_OK(status)) {
678 DEBUG(1, ("create_connection_server_info failed: %s\n",
679 nt_errstr(status)));
680 *pstatus = status;
681 conn_free(conn);
682 return NULL;
683 }
684
685 if ((lp_guest_only(snum)) || (lp_security() == SEC_SHARE)) {
686 conn->force_user = true;
687 }
688
689 add_session_user(sconn, conn->server_info->unix_name);
690
691 safe_strcpy(conn->client_address,
692 client_addr(get_client_fd(),addr,sizeof(addr)),
693 sizeof(conn->client_address)-1);
694 conn->num_files_open = 0;
695 conn->lastused = conn->lastused_count = time(NULL);
696 conn->used = True;
697 conn->printer = (strncmp(dev,"LPT",3) == 0);
698 conn->ipc = ( (strncmp(dev,"IPC",3) == 0) ||
699 ( lp_enable_asu_support() && strequal(dev,"ADMIN$")) );
700
701 /* Case options for the share. */
702 if (lp_casesensitive(snum) == Auto) {
703 /* We will be setting this per packet. Set to be case
704 * insensitive for now. */
705 conn->case_sensitive = False;
706 } else {
707 conn->case_sensitive = (bool)lp_casesensitive(snum);
708 }
709
710 conn->case_preserve = lp_preservecase(snum);
711 conn->short_case_preserve = lp_shortpreservecase(snum);
712
713 conn->encrypt_level = lp_smb_encrypt(snum);
714
715 conn->veto_list = NULL;
716 conn->hide_list = NULL;
717 conn->veto_oplock_list = NULL;
718 conn->aio_write_behind_list = NULL;
719
720 conn->read_only = lp_readonly(SNUM(conn));
721 conn->admin_user = False;
722
723 if (*lp_force_user(snum)) {
724
725 /*
726 * Replace conn->server_info with a completely faked up one
727 * from the username we are forced into :-)
728 */
729
730 char *fuser;
731 struct auth_serversupplied_info *forced_serverinfo;
732
733 fuser = talloc_string_sub(conn, lp_force_user(snum), "%S",
734 lp_servicename(snum));
735 if (fuser == NULL) {
736 conn_free(conn);
737 *pstatus = NT_STATUS_NO_MEMORY;
738 return NULL;
739 }
740
741 status = make_serverinfo_from_username(
742 conn, fuser, conn->server_info->guest,
743 &forced_serverinfo);
744 if (!NT_STATUS_IS_OK(status)) {
745 conn_free(conn);
746 *pstatus = status;
747 return NULL;
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 conn_free(conn);
771 *pstatus = status;
772 return NULL;
773 }
774
775 /*
776 * We need to cache this gid, to use within
777 * change_to_user() separately from the conn->server_info
778 * struct. We only use conn->server_info directly if
779 * "force_user" was set.
780 */
781 conn->force_group_gid = conn->server_info->utok.gid;
782 }
783
784 conn->vuid = (vuser != NULL) ? vuser->vuid : UID_FIELD_INVALID;
785
786 {
787 char *s = talloc_sub_advanced(talloc_tos(),
788 lp_servicename(SNUM(conn)),
789 conn->server_info->unix_name,
790 conn->connectpath,
791 conn->server_info->utok.gid,
792 conn->server_info->sanitized_username,
793 pdb_get_domain(conn->server_info->sam_account),
794 lp_pathname(snum));
795 if (!s) {
796 conn_free(conn);
797 *pstatus = NT_STATUS_NO_MEMORY;
798 return NULL;
799 }
800
801 if (!set_conn_connectpath(conn,s)) {
802 TALLOC_FREE(s);
803 conn_free(conn);
804 *pstatus = NT_STATUS_NO_MEMORY;
805 return NULL;
806 }
807 DEBUG(3,("Connect path is '%s' for service [%s]\n",s,
808 lp_servicename(snum)));
809 TALLOC_FREE(s);
810 }
811
812 /*
813 * New code to check if there's a share security descripter
814 * added from NT server manager. This is done after the
815 * smb.conf checks are done as we need a uid and token. JRA.
816 *
817 */
818
819 {
820 bool can_write = False;
821
822 can_write = share_access_check(conn->server_info->ptok,
823 lp_servicename(snum),
824 FILE_WRITE_DATA);
825
826 if (!can_write) {
827 if (!share_access_check(conn->server_info->ptok,
828 lp_servicename(snum),
829 FILE_READ_DATA)) {
830 /* No access, read or write. */
831 DEBUG(0,("make_connection: connection to %s "
832 "denied due to security "
833 "descriptor.\n",
834 lp_servicename(snum)));
835 conn_free(conn);
836 *pstatus = NT_STATUS_ACCESS_DENIED;
837 return NULL;
838 } else {
839 conn->read_only = True;
840 }
841 }
842 }
843 /* Initialise VFS function pointers */
844
845 if (!smbd_vfs_init(conn)) {
846 DEBUG(0, ("vfs_init failed for service %s\n",
847 lp_servicename(snum)));
848 conn_free(conn);
849 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
850 return NULL;
851 }
852
853 if ((!conn->printer) && (!conn->ipc)) {
854 conn->notify_ctx = notify_init(conn, server_id_self(),
855 smbd_messaging_context(),
856 smbd_event_context(),
857 conn);
858 }
859
860 /* ROOT Activities: */
861 if (lp_unix_extensions() && lp_widelinks(snum)) {
862 DEBUG(0,("Share '%s' has wide links and unix extensions enabled. "
863 "These parameters are incompatible. "
864 "Disabling wide links for this share.\n",
865 lp_servicename(snum) ));
866 lp_do_parameter(snum, "wide links", "False");
867 }
868
869 /*
870 * Enforce the max connections parameter.
871 */
872
873 if ((lp_max_connections(snum) > 0)
874 && (count_current_connections(lp_servicename(SNUM(conn)), True) >=
875 lp_max_connections(snum))) {
876
877 DEBUG(1, ("Max connections (%d) exceeded for %s\n",
878 lp_max_connections(snum), lp_servicename(snum)));
879 conn_free(conn);
880 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
881 return NULL;
882 }
883
884 /*
885 * Get us an entry in the connections db
886 */
887 if (!claim_connection(conn, lp_servicename(snum), 0)) {
888 DEBUG(1, ("Could not store connections entry\n"));
889 conn_free(conn);
890 *pstatus = NT_STATUS_INTERNAL_DB_ERROR;
891 return NULL;
892 }
893
894 /* Preexecs are done here as they might make the dir we are to ChDir
895 * to below */
896 /* execute any "root preexec = " line */
897 if (*lp_rootpreexec(snum)) {
898 char *cmd = talloc_sub_advanced(talloc_tos(),
899 lp_servicename(SNUM(conn)),
900 conn->server_info->unix_name,
901 conn->connectpath,
902 conn->server_info->utok.gid,
903 conn->server_info->sanitized_username,
904 pdb_get_domain(conn->server_info->sam_account),
905 lp_rootpreexec(snum));
906 DEBUG(5,("cmd=%s\n",cmd));
907 ret = smbrun(cmd,NULL);
908 TALLOC_FREE(cmd);
909 if (ret != 0 && lp_rootpreexec_close(snum)) {
910 DEBUG(1,("root preexec gave %d - failing "
911 "connection\n", ret));
912 yield_connection(conn, lp_servicename(snum));
913 conn_free(conn);
914 *pstatus = NT_STATUS_ACCESS_DENIED;
915 return NULL;
916 }
917 }
918
919 /*
920 * If widelinks are disallowed we need to canonicalise the connect
921 * path here to ensure we don't have any symlinks in the
922 * connectpath. We will be checking all paths on this connection are
923 * below this directory. We must do this after the VFS init as we
924 * depend on the realpath() pointer in the vfs table. JRA.
925 */
926 if (!lp_widelinks(snum)) {
927 if (!canonicalize_connect_path(conn)) {
928 DEBUG(0, ("canonicalize_connect_path failed "
929 "for service %s, path %s\n",
930 lp_servicename(snum),
931 conn->connectpath));
932 yield_connection(conn, lp_servicename(snum));
933 conn_free(conn);
934 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
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 yield_connection(conn, lp_servicename(snum));
944 conn_free(conn);
945 *pstatus = NT_STATUS_LOGON_FAILURE;
946 return NULL;
947 }
948
949 /* Remember that a different vuid can connect later without these
950 * checks... */
951
952 /* Preexecs are done here as they might make the dir we are to ChDir
953 * to below */
954
955 /* execute any "preexec = " line */
956 if (*lp_preexec(snum)) {
957 char *cmd = talloc_sub_advanced(talloc_tos(),
958 lp_servicename(SNUM(conn)),
959 conn->server_info->unix_name,
960 conn->connectpath,
961 conn->server_info->utok.gid,
962 conn->server_info->sanitized_username,
963 pdb_get_domain(conn->server_info->sam_account),
964 lp_preexec(snum));
965 ret = smbrun(cmd,NULL);
966 TALLOC_FREE(cmd);
967 if (ret != 0 && lp_preexec_close(snum)) {
968 DEBUG(1,("preexec gave %d - failing connection\n",
969 ret));
970 *pstatus = NT_STATUS_ACCESS_DENIED;
971 goto err_root_exit;
972 }
973 }
974
975 #ifdef WITH_FAKE_KASERVER
976 if (lp_afs_share(snum)) {
977 afs_login(conn);
978 }
979 #endif
980
981 /* Add veto/hide lists */
982 if (!IS_IPC(conn) && !IS_PRINT(conn)) {
983 set_namearray( &conn->veto_list, lp_veto_files(snum));
984 set_namearray( &conn->hide_list, lp_hide_files(snum));
985 set_namearray( &conn->veto_oplock_list, lp_veto_oplocks(snum));
986 set_namearray( &conn->aio_write_behind_list,
987 lp_aio_write_behind(snum));
988 }
989
990 /* Invoke VFS make connection hook - do this before the VFS_STAT call
991 to allow any filesystems needing user credentials to initialize
992 themselves. */
993
994 if (SMB_VFS_CONNECT(conn, lp_servicename(snum),
995 conn->server_info->unix_name) < 0) {
996 DEBUG(0,("make_connection: VFS make connection failed!\n"));
997 *pstatus = NT_STATUS_UNSUCCESSFUL;
998 goto err_root_exit;
999 }
1000
1001 /* Any error exit after here needs to call the disconnect hook. */
1002 on_err_call_dis_hook = true;
1003
1004 status = create_synthetic_smb_fname(talloc_tos(), conn->connectpath,
1005 NULL, NULL, &smb_fname_cpath);
1006 if (!NT_STATUS_IS_OK(status)) {
1007 *pstatus = status;
1008 goto err_root_exit;
1009 }
1010
1011 /* win2000 does not check the permissions on the directory
1012 during the tree connect, instead relying on permission
1013 check during individual operations. To match this behaviour
1014 I have disabled this chdir check (tridge) */
1015 /* the alternative is just to check the directory exists */
1016 if ((ret = SMB_VFS_STAT(conn, smb_fname_cpath)) != 0 ||
1017 !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
1018 if (ret == 0 && !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
1019 DEBUG(0,("'%s' is not a directory, when connecting to "
1020 "[%s]\n", conn->connectpath,
1021 lp_servicename(snum)));
1022 } else {
1023 DEBUG(0,("'%s' does not exist or permission denied "
1024 "when connecting to [%s] Error was %s\n",
1025 conn->connectpath, lp_servicename(snum),
1026 strerror(errno) ));
1027 }
1028 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
1029 goto err_root_exit;
1030 }
1031
1032 string_set(&conn->origpath,conn->connectpath);
1033
1034 #if SOFTLINK_OPTIMISATION
1035 /* resolve any soft links early if possible */
1036 if (vfs_ChDir(conn,conn->connectpath) == 0) {
1037 TALLOC_CTX *ctx = talloc_tos();
1038 char *s = vfs_GetWd(ctx,s);
1039 if (!s) {
1040 *status = map_nt_error_from_unix(errno);
1041 goto err_root_exit;
1042 }
1043 if (!set_conn_connectpath(conn,s)) {
1044 *status = NT_STATUS_NO_MEMORY;
1045 goto err_root_exit;
1046 }
1047 vfs_ChDir(conn,conn->connectpath);
1048 }
1049 #endif
1050
1051 /* Figure out the characteristics of the underlying filesystem. This
1052 * assumes that all the filesystem mounted withing a share path have
1053 * the same characteristics, which is likely but not guaranteed.
1054 */
1055
1056 conn->fs_capabilities = SMB_VFS_FS_CAPABILITIES(conn, &conn->ts_res);
1057
1058 /*
1059 * Print out the 'connected as' stuff here as we need
1060 * to know the effective uid and gid we will be using
1061 * (at least initially).
1062 */
1063
1064 if( DEBUGLVL( IS_IPC(conn) ? 3 : 1 ) ) {
1065 dbgtext( "%s (%s) ", get_remote_machine_name(),
1066 conn->client_address );
1067 dbgtext( "%s", srv_is_signing_active(smbd_server_conn) ? "signed " : "");
1068 dbgtext( "connect to service %s ", lp_servicename(snum) );
1069 dbgtext( "initially as user %s ",
1070 conn->server_info->unix_name );
1071 dbgtext( "(uid=%d, gid=%d) ", (int)geteuid(), (int)getegid() );
1072 dbgtext( "(pid %d)\n", (int)sys_getpid() );
1073 }
1074
1075 /* we've finished with the user stuff - go back to root */
1076 change_to_root_user();
1077 return(conn);
1078
1079 err_root_exit:
1080 TALLOC_FREE(smb_fname_cpath);
1081 change_to_root_user();
1082 if (on_err_call_dis_hook) {
1083 /* Call VFS disconnect hook */
1084 SMB_VFS_DISCONNECT(conn);
1085 }
1086 yield_connection(conn, lp_servicename(snum));
1087 conn_free(conn);
1088 return NULL;
1089 }
1090
1091 /****************************************************************************
1092 Make a connection to a service.
1093 *
1094 * @param service
1095 ****************************************************************************/
1096
1097 connection_struct *make_connection(struct smbd_server_connection *sconn,
1098 const char *service_in, DATA_BLOB password,
1099 const char *pdev, uint16 vuid,
1100 NTSTATUS *status)
1101 {
1102 uid_t euid;
1103 user_struct *vuser = NULL;
1104 fstring service;
1105 fstring dev;
1106 int snum = -1;
1107 char addr[INET6_ADDRSTRLEN];
1108
1109 fstrcpy(dev, pdev);
1110
1111 /* This must ONLY BE CALLED AS ROOT. As it exits this function as
1112 * root. */
1113 if (!non_root_mode() && (euid = geteuid()) != 0) {
1114 DEBUG(0,("make_connection: PANIC ERROR. Called as nonroot "
1115 "(%u)\n", (unsigned int)euid ));
1116 smb_panic("make_connection: PANIC ERROR. Called as nonroot\n");
1117 }
1118
1119 if (conn_num_open(sconn) > 2047) {
1120 *status = NT_STATUS_INSUFF_SERVER_RESOURCES;
1121 return NULL;
1122 }
1123
1124 if(lp_security() != SEC_SHARE) {
1125 vuser = get_valid_user_struct(sconn, vuid);
1126 if (!vuser) {
1127 DEBUG(1,("make_connection: refusing to connect with "
1128 "no session setup\n"));
1129 *status = NT_STATUS_ACCESS_DENIED;
1130 return NULL;
1131 }
1132 }
1133
1134 /* Logic to try and connect to the correct [homes] share, preferably
1135 without too many getpwnam() lookups. This is particulary nasty for
1136 winbind usernames, where the share name isn't the same as unix
1137 username.
1138
1139 The snum of the homes share is stored on the vuser at session setup
1140 time.
1141 */
1142
1143 if (strequal(service_in,HOMES_NAME)) {
1144 if(lp_security() != SEC_SHARE) {
1145 DATA_BLOB no_pw = data_blob_null;
1146 if (vuser->homes_snum == -1) {
1147 DEBUG(2, ("[homes] share not available for "
1148 "this user because it was not found "
1149 "or created at session setup "
1150 "time\n"));
1151 *status = NT_STATUS_BAD_NETWORK_NAME;
1152 return NULL;
1153 }
1154 DEBUG(5, ("making a connection to [homes] service "
1155 "created at session setup time\n"));
1156 return make_connection_snum(sconn,
1157 vuser->homes_snum,
1158 vuser, no_pw,
1159 dev, status);
1160 } else {
1161 /* Security = share. Try with
1162 * current_user_info.smb_name as the username. */
1163 if (*current_user_info.smb_name) {
1164 fstring unix_username;
1165 fstrcpy(unix_username,
1166 current_user_info.smb_name);
1167 map_username(sconn, unix_username);
1168 snum = find_service(unix_username);
1169 }
1170 if (snum != -1) {
1171 DEBUG(5, ("making a connection to 'homes' "
1172 "service %s based on "
1173 "security=share\n", service_in));
1174 return make_connection_snum(sconn,
1175 snum, NULL,
1176 password,
1177 dev, status);
1178 }
1179 }
1180 } else if ((lp_security() != SEC_SHARE) && (vuser->homes_snum != -1)
1181 && strequal(service_in,
1182 lp_servicename(vuser->homes_snum))) {
1183 DATA_BLOB no_pw = data_blob_null;
1184 DEBUG(5, ("making a connection to 'homes' service [%s] "
1185 "created at session setup time\n", service_in));
1186 return make_connection_snum(sconn,
1187 vuser->homes_snum,
1188 vuser, no_pw,
1189 dev, status);
1190 }
1191
1192 fstrcpy(service, service_in);
1193
1194 strlower_m(service);
1195
1196 snum = find_service(service);
1197
1198 if (snum < 0) {
1199 if (strequal(service,"IPC$") ||
1200 (lp_enable_asu_support() && strequal(service,"ADMIN$"))) {
1201 DEBUG(3,("refusing IPC connection to %s\n", service));
1202 *status = NT_STATUS_ACCESS_DENIED;
1203 return NULL;
1204 }
1205
1206 DEBUG(3,("%s (%s) couldn't find service %s\n",
1207 get_remote_machine_name(),
1208 client_addr(get_client_fd(),addr,sizeof(addr)),
1209 service));
1210 *status = NT_STATUS_BAD_NETWORK_NAME;
1211 return NULL;
1212 }
1213
1214 /* Handle non-Dfs clients attempting connections to msdfs proxy */
1215 if (lp_host_msdfs() && (*lp_msdfs_proxy(snum) != '\0')) {
1216 DEBUG(3, ("refusing connection to dfs proxy share '%s' "
1217 "(pointing to %s)\n",
1218 service, lp_msdfs_proxy(snum)));
1219 *status = NT_STATUS_BAD_NETWORK_NAME;
1220 return NULL;
1221 }
1222
1223 DEBUG(5, ("making a connection to 'normal' service %s\n", service));
1224
1225 return make_connection_snum(sconn, snum, vuser,
1226 password,
1227 dev, status);
1228 }
1229
1230 /****************************************************************************
1231 Close a cnum.
1232 ****************************************************************************/
1233
1234 void close_cnum(connection_struct *conn, uint16 vuid)
1235 {
1236 file_close_conn(conn);
1237
1238 if (!IS_IPC(conn)) {
1239 dptr_closecnum(conn);
1240 }
1241
1242 change_to_root_user();
1243
1244 DEBUG(IS_IPC(conn)?3:1, ("%s (%s) closed connection to service %s\n",
1245 get_remote_machine_name(),
1246 conn->client_address,
1247 lp_servicename(SNUM(conn))));
1248
1249 /* Call VFS disconnect hook */
1250 SMB_VFS_DISCONNECT(conn);
1251
1252 yield_connection(conn, lp_servicename(SNUM(conn)));
1253
1254 /* make sure we leave the directory available for unmount */
1255 vfs_ChDir(conn, "/");
1256
1257 /* execute any "postexec = " line */
1258 if (*lp_postexec(SNUM(conn)) &&
1259 change_to_user(conn, vuid)) {
1260 char *cmd = talloc_sub_advanced(talloc_tos(),
1261 lp_servicename(SNUM(conn)),
1262 conn->server_info->unix_name,
1263 conn->connectpath,
1264 conn->server_info->utok.gid,
1265 conn->server_info->sanitized_username,
1266 pdb_get_domain(conn->server_info->sam_account),
1267 lp_postexec(SNUM(conn)));
1268 smbrun(cmd,NULL);
1269 TALLOC_FREE(cmd);
1270 change_to_root_user();
1271 }
1272
1273 change_to_root_user();
1274 /* execute any "root postexec = " line */
1275 if (*lp_rootpostexec(SNUM(conn))) {
1276 char *cmd = talloc_sub_advanced(talloc_tos(),
1277 lp_servicename(SNUM(conn)),
1278 conn->server_info->unix_name,
1279 conn->connectpath,
1280 conn->server_info->utok.gid,
1281 conn->server_info->sanitized_username,
1282 pdb_get_domain(conn->server_info->sam_account),
1283 lp_rootpostexec(SNUM(conn)));
1284 smbrun(cmd,NULL);
1285 TALLOC_FREE(cmd);
1286 }
1287
1288 conn_free(conn);
1289 }
Samba GIT mirror