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do not log chdir with level 0 if reason is access denied
[Samba/gebeck_regimport.git] / source3 / smbd / service.c
bloba043288bc90000bc35686b803ca1ba4985d2c122
1 /*
2 Unix SMB/CIFS implementation.
3 service (connection) opening and closing
4 Copyright (C) Andrew Tridgell 1992-1998
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20 #include "includes.h"
21 #include "smbd/globals.h"
22
23 extern userdom_struct current_user_info;
24
25 static bool canonicalize_connect_path(connection_struct *conn)
26 {
27 #ifdef REALPATH_TAKES_NULL
28 bool ret;
29 char *resolved_name = SMB_VFS_REALPATH(conn,conn->connectpath,NULL);
30 if (!resolved_name) {
31 return false;
32 }
33 ret = set_conn_connectpath(conn,resolved_name);
34 SAFE_FREE(resolved_name);
35 return ret;
36 #else
37 char resolved_name_buf[PATH_MAX+1];
38 char *resolved_name = SMB_VFS_REALPATH(conn,conn->connectpath,resolved_name_buf);
39 if (!resolved_name) {
40 return false;
41 }
42 return set_conn_connectpath(conn,resolved_name);
43 #endif /* REALPATH_TAKES_NULL */
44 }
45
46 /****************************************************************************
47 Ensure when setting connectpath it is a canonicalized (no ./ // or ../)
48 absolute path stating in / and not ending in /.
49 Observent people will notice a similarity between this and check_path_syntax :-).
50 ****************************************************************************/
51
52 bool set_conn_connectpath(connection_struct *conn, const char *connectpath)
53 {
54 char *destname;
55 char *d;
56 const char *s = connectpath;
57 bool start_of_name_component = true;
58
59 destname = SMB_STRDUP(connectpath);
60 if (!destname) {
61 return false;
62 }
63 d = destname;
64
65 *d++ = '/'; /* Always start with root. */
66
67 while (*s) {
68 if (*s == '/') {
69 /* Eat multiple '/' */
70 while (*s == '/') {
71 s++;
72 }
73 if ((d > destname + 1) && (*s != '\0')) {
74 *d++ = '/';
75 }
76 start_of_name_component = True;
77 continue;
78 }
79
80 if (start_of_name_component) {
81 if ((s[0] == '.') && (s[1] == '.') && (s[2] == '/' || s[2] == '\0')) {
82 /* Uh oh - "/../" or "/..\0" ! */
83
84 /* Go past the ../ or .. */
85 if (s[2] == '/') {
86 s += 3;
87 } else {
88 s += 2; /* Go past the .. */
89 }
90
91 /* If we just added a '/' - delete it */
92 if ((d > destname) && (*(d-1) == '/')) {
93 *(d-1) = '\0';
94 d--;
95 }
96
97 /* Are we at the start ? Can't go back further if so. */
98 if (d <= destname) {
99 *d++ = '/'; /* Can't delete root */
100 continue;
101 }
102 /* Go back one level... */
103 /* Decrement d first as d points to the *next* char to write into. */
104 for (d--; d > destname; d--) {
105 if (*d == '/') {
106 break;
107 }
108 }
109 /* We're still at the start of a name component, just the previous one. */
110 continue;
111 } else if ((s[0] == '.') && ((s[1] == '\0') || s[1] == '/')) {
112 /* Component of pathname can't be "." only - skip the '.' . */
113 if (s[1] == '/') {
114 s += 2;
115 } else {
116 s++;
117 }
118 continue;
119 }
120 }
121
122 if (!(*s & 0x80)) {
123 *d++ = *s++;
124 } else {
125 size_t siz;
126 /* Get the size of the next MB character. */
127 next_codepoint(s,&siz);
128 switch(siz) {
129 case 5:
130 *d++ = *s++;
131 /*fall through*/
132 case 4:
133 *d++ = *s++;
134 /*fall through*/
135 case 3:
136 *d++ = *s++;
137 /*fall through*/
138 case 2:
139 *d++ = *s++;
140 /*fall through*/
141 case 1:
142 *d++ = *s++;
143 break;
144 default:
145 break;
146 }
147 }
148 start_of_name_component = false;
149 }
150 *d = '\0';
151
152 /* And must not end in '/' */
153 if (d > destname + 1 && (*(d-1) == '/')) {
154 *(d-1) = '\0';
155 }
156
157 DEBUG(10,("set_conn_connectpath: service %s, connectpath = %s\n",
158 lp_servicename(SNUM(conn)), destname ));
159
160 string_set(&conn->connectpath, destname);
161 SAFE_FREE(destname);
162 return true;
163 }
164
165 /****************************************************************************
166 Load parameters specific to a connection/service.
167 ****************************************************************************/
168
169 bool set_current_service(connection_struct *conn, uint16 flags, bool do_chdir)
170 {
171 int snum;
172
173 if (!conn) {
174 last_conn = NULL;
175 return(False);
176 }
177
178 conn->lastused_count++;
179
180 snum = SNUM(conn);
181
182 if (do_chdir &&
183 vfs_ChDir(conn,conn->connectpath) != 0 &&
184 vfs_ChDir(conn,conn->origpath) != 0) {
185 DEBUG(((errno!=EACCES)?0:3),("chdir (%s) failed, reason: %s\n",
186 conn->connectpath, strerror(errno)));
187 return(False);
188 }
189
190 if ((conn == last_conn) && (last_flags == flags)) {
191 return(True);
192 }
193
194 last_conn = conn;
195 last_flags = flags;
196
197 /* Obey the client case sensitivity requests - only for clients that support it. */
198 switch (lp_casesensitive(snum)) {
199 case Auto:
200 {
201 /* We need this uglyness due to DOS/Win9x clients that lie about case insensitivity. */
202 enum remote_arch_types ra_type = get_remote_arch();
203 if ((ra_type != RA_SAMBA) && (ra_type != RA_CIFSFS)) {
204 /* Client can't support per-packet case sensitive pathnames. */
205 conn->case_sensitive = False;
206 } else {
207 conn->case_sensitive = !(flags & FLAG_CASELESS_PATHNAMES);
208 }
209 }
210 break;
211 case True:
212 conn->case_sensitive = True;
213 break;
214 default:
215 conn->case_sensitive = False;
216 break;
217 }
218 return(True);
219 }
220
221 static int load_registry_service(const char *servicename)
222 {
223 if (!lp_registry_shares()) {
224 return -1;
225 }
226
227 if ((servicename == NULL) || (*servicename == '\0')) {
228 return -1;
229 }
230
231 if (strequal(servicename, GLOBAL_NAME)) {
232 return -2;
233 }
234
235 if (!process_registry_service(servicename)) {
236 return -1;
237 }
238
239 return lp_servicenumber(servicename);
240 }
241
242 void load_registry_shares(void)
243 {
244 DEBUG(8, ("load_registry_shares()\n"));
245 if (!lp_registry_shares()) {
246 return;
247 }
248
249 process_registry_shares();
250
251 return;
252 }
253
254 /****************************************************************************
255 Add a home service. Returns the new service number or -1 if fail.
256 ****************************************************************************/
257
258 int add_home_service(const char *service, const char *username, const char *homedir)
259 {
260 int iHomeService;
261
262 if (!service || !homedir)
263 return -1;
264
265 if ((iHomeService = lp_servicenumber(HOMES_NAME)) < 0) {
266 if ((iHomeService = load_registry_service(HOMES_NAME)) < 0) {
267 return -1;
268 }
269 }
270
271 /*
272 * If this is a winbindd provided username, remove
273 * the domain component before adding the service.
274 * Log a warning if the "path=" parameter does not
275 * include any macros.
276 */
277
278 {
279 const char *p = strchr(service,*lp_winbind_separator());
280
281 /* We only want the 'user' part of the string */
282 if (p) {
283 service = p + 1;
284 }
285 }
286
287 if (!lp_add_home(service, iHomeService, username, homedir)) {
288 return -1;
289 }
290
291 return lp_servicenumber(service);
292
293 }
294
295 /**
296 * Find a service entry.
297 *
298 * @param service is modified (to canonical form??)
299 **/
300
301 int find_service(fstring service)
302 {
303 int iService;
304 struct smbd_server_connection *sconn = smbd_server_conn;
305
306 all_string_sub(service,"\\","/",0);
307
308 iService = lp_servicenumber(service);
309
310 /* now handle the special case of a home directory */
311 if (iService < 0) {
312 char *phome_dir = get_user_home_dir(talloc_tos(), service);
313
314 if(!phome_dir) {
315 /*
316 * Try mapping the servicename, it may
317 * be a Windows to unix mapped user name.
318 */
319 if(map_username(sconn, service))
320 phome_dir = get_user_home_dir(
321 talloc_tos(), service);
322 }
323
324 DEBUG(3,("checking for home directory %s gave %s\n",service,
325 phome_dir?phome_dir:"(NULL)"));
326
327 iService = add_home_service(service,service /* 'username' */, phome_dir);
328 }
329
330 /* If we still don't have a service, attempt to add it as a printer. */
331 if (iService < 0) {
332 int iPrinterService;
333
334 if ((iPrinterService = lp_servicenumber(PRINTERS_NAME)) < 0) {
335 iPrinterService = load_registry_service(PRINTERS_NAME);
336 }
337 if (iPrinterService) {
338 DEBUG(3,("checking whether %s is a valid printer name...\n", service));
339 if (pcap_printername_ok(service)) {
340 DEBUG(3,("%s is a valid printer name\n", service));
341 DEBUG(3,("adding %s as a printer service\n", service));
342 lp_add_printer(service, iPrinterService);
343 iService = lp_servicenumber(service);
344 if (iService < 0) {
345 DEBUG(0,("failed to add %s as a printer service!\n", service));
346 }
347 } else {
348 DEBUG(3,("%s is not a valid printer name\n", service));
349 }
350 }
351 }
352
353 /* Check for default vfs service? Unsure whether to implement this */
354 if (iService < 0) {
355 }
356
357 if (iService < 0) {
358 iService = load_registry_service(service);
359 }
360
361 /* Is it a usershare service ? */
362 if (iService < 0 && *lp_usershare_path()) {
363 /* Ensure the name is canonicalized. */
364 strlower_m(service);
365 iService = load_usershare_service(service);
366 }
367
368 /* just possibly it's a default service? */
369 if (iService < 0) {
370 char *pdefservice = lp_defaultservice();
371 if (pdefservice && *pdefservice && !strequal(pdefservice,service) && !strstr_m(service,"..")) {
372 /*
373 * We need to do a local copy here as lp_defaultservice()
374 * returns one of the rotating lp_string buffers that
375 * could get overwritten by the recursive find_service() call
376 * below. Fix from Josef Hinteregger <joehtg@joehtg.co.at>.
377 */
378 char *defservice = SMB_STRDUP(pdefservice);
379
380 if (!defservice) {
381 goto fail;
382 }
383
384 /* Disallow anything except explicit share names. */
385 if (strequal(defservice,HOMES_NAME) ||
386 strequal(defservice, PRINTERS_NAME) ||
387 strequal(defservice, "IPC$")) {
388 SAFE_FREE(defservice);
389 goto fail;
390 }
391
392 iService = find_service(defservice);
393 if (iService >= 0) {
394 all_string_sub(service, "_","/",0);
395 iService = lp_add_service(service, iService);
396 }
397 SAFE_FREE(defservice);
398 }
399 }
400
401 if (iService >= 0) {
402 if (!VALID_SNUM(iService)) {
403 DEBUG(0,("Invalid snum %d for %s\n",iService, service));
404 iService = -1;
405 }
406 }
407
408 fail:
409
410 if (iService < 0)
411 DEBUG(3,("find_service() failed to find service %s\n", service));
412
413 return (iService);
414 }
415
416
417 /****************************************************************************
418 do some basic sainity checks on the share.
419 This function modifies dev, ecode.
420 ****************************************************************************/
421
422 static NTSTATUS share_sanity_checks(int snum, fstring dev)
423 {
424
425 if (!lp_snum_ok(snum) ||
426 !check_access(smbd_server_fd(),
427 lp_hostsallow(snum), lp_hostsdeny(snum))) {
428 return NT_STATUS_ACCESS_DENIED;
429 }
430
431 if (dev[0] == '?' || !dev[0]) {
432 if (lp_print_ok(snum)) {
433 fstrcpy(dev,"LPT1:");
434 } else if (strequal(lp_fstype(snum), "IPC")) {
435 fstrcpy(dev, "IPC");
436 } else {
437 fstrcpy(dev,"A:");
438 }
439 }
440
441 strupper_m(dev);
442
443 if (lp_print_ok(snum)) {
444 if (!strequal(dev, "LPT1:")) {
445 return NT_STATUS_BAD_DEVICE_TYPE;
446 }
447 } else if (strequal(lp_fstype(snum), "IPC")) {
448 if (!strequal(dev, "IPC")) {
449 return NT_STATUS_BAD_DEVICE_TYPE;
450 }
451 } else if (!strequal(dev, "A:")) {
452 return NT_STATUS_BAD_DEVICE_TYPE;
453 }
454
455 /* Behave as a printer if we are supposed to */
456 if (lp_print_ok(snum) && (strcmp(dev, "A:") == 0)) {
457 fstrcpy(dev, "LPT1:");
458 }
459
460 return NT_STATUS_OK;
461 }
462
463 /*
464 * Go through lookup_name etc to find the force'd group.
465 *
466 * Create a new token from src_token, replacing the primary group sid with the
467 * one found.
468 */
469
470 static NTSTATUS find_forced_group(bool force_user,
471 int snum, const char *username,
472 DOM_SID *pgroup_sid,
473 gid_t *pgid)
474 {
475 NTSTATUS result = NT_STATUS_NO_SUCH_GROUP;
476 TALLOC_CTX *frame = talloc_stackframe();
477 DOM_SID group_sid;
478 enum lsa_SidType type;
479 char *groupname;
480 bool user_must_be_member = False;
481 gid_t gid;
482
483 groupname = talloc_strdup(talloc_tos(), lp_force_group(snum));
484 if (groupname == NULL) {
485 DEBUG(1, ("talloc_strdup failed\n"));
486 result = NT_STATUS_NO_MEMORY;
487 goto done;
488 }
489
490 if (groupname[0] == '+') {
491 user_must_be_member = True;
492 groupname += 1;
493 }
494
495 groupname = talloc_string_sub(talloc_tos(), groupname,
496 "%S", lp_servicename(snum));
497 if (groupname == NULL) {
498 DEBUG(1, ("talloc_string_sub failed\n"));
499 result = NT_STATUS_NO_MEMORY;
500 goto done;
501 }
502
503 if (!lookup_name_smbconf(talloc_tos(), groupname,
504 LOOKUP_NAME_ALL|LOOKUP_NAME_GROUP,
505 NULL, NULL, &group_sid, &type)) {
506 DEBUG(10, ("lookup_name_smbconf(%s) failed\n",
507 groupname));
508 goto done;
509 }
510
511 if ((type != SID_NAME_DOM_GRP) && (type != SID_NAME_ALIAS) &&
512 (type != SID_NAME_WKN_GRP)) {
513 DEBUG(10, ("%s is a %s, not a group\n", groupname,
514 sid_type_lookup(type)));
515 goto done;
516 }
517
518 if (!sid_to_gid(&group_sid, &gid)) {
519 DEBUG(10, ("sid_to_gid(%s) for %s failed\n",
520 sid_string_dbg(&group_sid), groupname));
521 goto done;
522 }
523
524 /*
525 * If the user has been forced and the forced group starts with a '+',
526 * then we only set the group to be the forced group if the forced
527 * user is a member of that group. Otherwise, the meaning of the '+'
528 * would be ignored.
529 */
530
531 if (force_user && user_must_be_member) {
532 if (user_in_group_sid(username, &group_sid)) {
533 sid_copy(pgroup_sid, &group_sid);
534 *pgid = gid;
535 DEBUG(3,("Forced group %s for member %s\n",
536 groupname, username));
537 } else {
538 DEBUG(0,("find_forced_group: forced user %s is not a member "
539 "of forced group %s. Disallowing access.\n",
540 username, groupname ));
541 result = NT_STATUS_MEMBER_NOT_IN_GROUP;
542 goto done;
543 }
544 } else {
545 sid_copy(pgroup_sid, &group_sid);
546 *pgid = gid;
547 DEBUG(3,("Forced group %s\n", groupname));
548 }
549
550 result = NT_STATUS_OK;
551 done:
552 TALLOC_FREE(frame);
553 return result;
554 }
555
556 /****************************************************************************
557 Create an auth_serversupplied_info structure for a connection_struct
558 ****************************************************************************/
559
560 static NTSTATUS create_connection_server_info(struct smbd_server_connection *sconn,
561 TALLOC_CTX *mem_ctx, int snum,
562 struct auth_serversupplied_info *vuid_serverinfo,
563 DATA_BLOB password,
564 struct auth_serversupplied_info **presult)
565 {
566 if (lp_guest_only(snum)) {
567 return make_server_info_guest(mem_ctx, presult);
568 }
569
570 if (vuid_serverinfo != NULL) {
571
572 struct auth_serversupplied_info *result;
573
574 /*
575 * This is the normal security != share case where we have a
576 * valid vuid from the session setup. */
577
578 if (vuid_serverinfo->guest) {
579 if (!lp_guest_ok(snum)) {
580 DEBUG(2, ("guest user (from session setup) "
581 "not permitted to access this share "
582 "(%s)\n", lp_servicename(snum)));
583 return NT_STATUS_ACCESS_DENIED;
584 }
585 } else {
586 if (!user_ok_token(vuid_serverinfo->unix_name,
587 pdb_get_domain(vuid_serverinfo->sam_account),
588 vuid_serverinfo->ptok, snum)) {
589 DEBUG(2, ("user '%s' (from session setup) not "
590 "permitted to access this share "
591 "(%s)\n",
592 vuid_serverinfo->unix_name,
593 lp_servicename(snum)));
594 return NT_STATUS_ACCESS_DENIED;
595 }
596 }
597
598 result = copy_serverinfo(mem_ctx, vuid_serverinfo);
599 if (result == NULL) {
600 return NT_STATUS_NO_MEMORY;
601 }
602
603 *presult = result;
604 return NT_STATUS_OK;
605 }
606
607 if (lp_security() == SEC_SHARE) {
608
609 fstring user;
610 bool guest;
611
612 /* add the sharename as a possible user name if we
613 are in share mode security */
614
615 add_session_user(sconn, lp_servicename(snum));
616
617 /* shall we let them in? */
618
619 if (!authorise_login(sconn, snum,user,password,&guest)) {
620 DEBUG( 2, ( "Invalid username/password for [%s]\n",
621 lp_servicename(snum)) );
622 return NT_STATUS_WRONG_PASSWORD;
623 }
624
625 return make_serverinfo_from_username(mem_ctx, user, guest,
626 presult);
627 }
628
629 DEBUG(0, ("invalid VUID (vuser) but not in security=share\n"));
630 return NT_STATUS_ACCESS_DENIED;
631 }
632
633
634 /****************************************************************************
635 Make a connection, given the snum to connect to, and the vuser of the
636 connecting user if appropriate.
637 ****************************************************************************/
638
639 connection_struct *make_connection_snum(struct smbd_server_connection *sconn,
640 int snum, user_struct *vuser,
641 DATA_BLOB password,
642 const char *pdev,
643 NTSTATUS *pstatus)
644 {
645 connection_struct *conn;
646 struct smb_filename *smb_fname_cpath = NULL;
647 fstring dev;
648 int ret;
649 char addr[INET6_ADDRSTRLEN];
650 bool on_err_call_dis_hook = false;
651 NTSTATUS status;
652
653 fstrcpy(dev, pdev);
654
655 if (NT_STATUS_IS_ERR(*pstatus = share_sanity_checks(snum, dev))) {
656 return NULL;
657 }
658
659 conn = conn_new(sconn);
660 if (!conn) {
661 DEBUG(0,("Couldn't find free connection.\n"));
662 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
663 return NULL;
664 }
665
666 conn->params->service = snum;
667
668 status = create_connection_server_info(sconn,
669 conn, snum, vuser ? vuser->server_info : NULL, password,
670 &conn->server_info);
671
672 if (!NT_STATUS_IS_OK(status)) {
673 DEBUG(1, ("create_connection_server_info failed: %s\n",
674 nt_errstr(status)));
675 *pstatus = status;
676 conn_free(sconn, conn);
677 return NULL;
678 }
679
680 if ((lp_guest_only(snum)) || (lp_security() == SEC_SHARE)) {
681 conn->force_user = true;
682 }
683
684 add_session_user(sconn, conn->server_info->unix_name);
685
686 safe_strcpy(conn->client_address,
687 client_addr(get_client_fd(),addr,sizeof(addr)),
688 sizeof(conn->client_address)-1);
689 conn->num_files_open = 0;
690 conn->lastused = conn->lastused_count = time(NULL);
691 conn->used = True;
692 conn->printer = (strncmp(dev,"LPT",3) == 0);
693 conn->ipc = ( (strncmp(dev,"IPC",3) == 0) ||
694 ( lp_enable_asu_support() && strequal(dev,"ADMIN$")) );
695 conn->dirptr = NULL;
696
697 /* Case options for the share. */
698 if (lp_casesensitive(snum) == Auto) {
699 /* We will be setting this per packet. Set to be case
700 * insensitive for now. */
701 conn->case_sensitive = False;
702 } else {
703 conn->case_sensitive = (bool)lp_casesensitive(snum);
704 }
705
706 conn->case_preserve = lp_preservecase(snum);
707 conn->short_case_preserve = lp_shortpreservecase(snum);
708
709 conn->encrypt_level = lp_smb_encrypt(snum);
710
711 conn->veto_list = NULL;
712 conn->hide_list = NULL;
713 conn->veto_oplock_list = NULL;
714 conn->aio_write_behind_list = NULL;
715 string_set(&conn->dirpath,"");
716
717 conn->read_only = lp_readonly(SNUM(conn));
718 conn->admin_user = False;
719
720 if (*lp_force_user(snum)) {
721
722 /*
723 * Replace conn->server_info with a completely faked up one
724 * from the username we are forced into :-)
725 */
726
727 char *fuser;
728 struct auth_serversupplied_info *forced_serverinfo;
729
730 fuser = talloc_string_sub(conn, lp_force_user(snum), "%S",
731 lp_servicename(snum));
732 if (fuser == NULL) {
733 conn_free(sconn, conn);
734 *pstatus = NT_STATUS_NO_MEMORY;
735 return NULL;
736 }
737
738 status = make_serverinfo_from_username(
739 conn, fuser, conn->server_info->guest,
740 &forced_serverinfo);
741 if (!NT_STATUS_IS_OK(status)) {
742 conn_free(sconn, conn);
743 *pstatus = status;
744 return NULL;
745 }
746
747 TALLOC_FREE(conn->server_info);
748 conn->server_info = forced_serverinfo;
749
750 conn->force_user = True;
751 DEBUG(3,("Forced user %s\n", fuser));
752 }
753
754 /*
755 * If force group is true, then override
756 * any groupid stored for the connecting user.
757 */
758
759 if (*lp_force_group(snum)) {
760
761 status = find_forced_group(
762 conn->force_user, snum, conn->server_info->unix_name,
763 &conn->server_info->ptok->user_sids[1],
764 &conn->server_info->utok.gid);
765
766 if (!NT_STATUS_IS_OK(status)) {
767 conn_free(sconn, conn);
768 *pstatus = status;
769 return NULL;
770 }
771
772 /*
773 * We need to cache this gid, to use within
774 * change_to_user() separately from the conn->server_info
775 * struct. We only use conn->server_info directly if
776 * "force_user" was set.
777 */
778 conn->force_group_gid = conn->server_info->utok.gid;
779 }
780
781 conn->vuid = (vuser != NULL) ? vuser->vuid : UID_FIELD_INVALID;
782
783 {
784 char *s = talloc_sub_advanced(talloc_tos(),
785 lp_servicename(SNUM(conn)),
786 conn->server_info->unix_name,
787 conn->connectpath,
788 conn->server_info->utok.gid,
789 conn->server_info->sanitized_username,
790 pdb_get_domain(conn->server_info->sam_account),
791 lp_pathname(snum));
792 if (!s) {
793 conn_free(sconn, conn);
794 *pstatus = NT_STATUS_NO_MEMORY;
795 return NULL;
796 }
797
798 if (!set_conn_connectpath(conn,s)) {
799 TALLOC_FREE(s);
800 conn_free(sconn, conn);
801 *pstatus = NT_STATUS_NO_MEMORY;
802 return NULL;
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 conn_free(sconn, conn);
833 *pstatus = NT_STATUS_ACCESS_DENIED;
834 return NULL;
835 } else {
836 conn->read_only = True;
837 }
838 }
839 }
840 /* Initialise VFS function pointers */
841
842 if (!smbd_vfs_init(conn)) {
843 DEBUG(0, ("vfs_init failed for service %s\n",
844 lp_servicename(snum)));
845 conn_free(sconn, conn);
846 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
847 return NULL;
848 }
849
850 /*
851 * If widelinks are disallowed we need to canonicalise the connect
852 * path here to ensure we don't have any symlinks in the
853 * connectpath. We will be checking all paths on this connection are
854 * below this directory. We must do this after the VFS init as we
855 * depend on the realpath() pointer in the vfs table. JRA.
856 */
857 if (!lp_widelinks(snum)) {
858 if (!canonicalize_connect_path(conn)) {
859 DEBUG(0, ("canonicalize_connect_path failed "
860 "for service %s, path %s\n",
861 lp_servicename(snum),
862 conn->connectpath));
863 conn_free(sconn, conn);
864 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
865 return NULL;
866 }
867 }
868
869 if ((!conn->printer) && (!conn->ipc)) {
870 conn->notify_ctx = notify_init(conn, server_id_self(),
871 smbd_messaging_context(),
872 smbd_event_context(),
873 conn);
874 }
875
876 /* ROOT Activities: */
877 /*
878 * Enforce the max connections parameter.
879 */
880
881 if ((lp_max_connections(snum) > 0)
882 && (count_current_connections(lp_servicename(SNUM(conn)), True) >=
883 lp_max_connections(snum))) {
884
885 DEBUG(1, ("Max connections (%d) exceeded for %s\n",
886 lp_max_connections(snum), lp_servicename(snum)));
887 conn_free(sconn, conn);
888 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
889 return NULL;
890 }
891
892 /*
893 * Get us an entry in the connections db
894 */
895 if (!claim_connection(conn, lp_servicename(snum), 0)) {
896 DEBUG(1, ("Could not store connections entry\n"));
897 conn_free(sconn, conn);
898 *pstatus = NT_STATUS_INTERNAL_DB_ERROR;
899 return NULL;
900 }
901
902 /* Preexecs are done here as they might make the dir we are to ChDir
903 * to below */
904 /* execute any "root preexec = " line */
905 if (*lp_rootpreexec(snum)) {
906 char *cmd = talloc_sub_advanced(talloc_tos(),
907 lp_servicename(SNUM(conn)),
908 conn->server_info->unix_name,
909 conn->connectpath,
910 conn->server_info->utok.gid,
911 conn->server_info->sanitized_username,
912 pdb_get_domain(conn->server_info->sam_account),
913 lp_rootpreexec(snum));
914 DEBUG(5,("cmd=%s\n",cmd));
915 ret = smbrun(cmd,NULL);
916 TALLOC_FREE(cmd);
917 if (ret != 0 && lp_rootpreexec_close(snum)) {
918 DEBUG(1,("root preexec gave %d - failing "
919 "connection\n", ret));
920 yield_connection(conn, lp_servicename(snum));
921 conn_free(sconn, conn);
922 *pstatus = NT_STATUS_ACCESS_DENIED;
923 return NULL;
924 }
925 }
926
927 /* USER Activites: */
928 if (!change_to_user(conn, conn->vuid)) {
929 /* No point continuing if they fail the basic checks */
930 DEBUG(0,("Can't become connected user!\n"));
931 yield_connection(conn, lp_servicename(snum));
932 conn_free(sconn, conn);
933 *pstatus = NT_STATUS_LOGON_FAILURE;
934 return NULL;
935 }
936
937 /* Remember that a different vuid can connect later without these
938 * checks... */
939
940 /* Preexecs are done here as they might make the dir we are to ChDir
941 * to below */
942
943 /* execute any "preexec = " line */
944 if (*lp_preexec(snum)) {
945 char *cmd = talloc_sub_advanced(talloc_tos(),
946 lp_servicename(SNUM(conn)),
947 conn->server_info->unix_name,
948 conn->connectpath,
949 conn->server_info->utok.gid,
950 conn->server_info->sanitized_username,
951 pdb_get_domain(conn->server_info->sam_account),
952 lp_preexec(snum));
953 ret = smbrun(cmd,NULL);
954 TALLOC_FREE(cmd);
955 if (ret != 0 && lp_preexec_close(snum)) {
956 DEBUG(1,("preexec gave %d - failing connection\n",
957 ret));
958 *pstatus = NT_STATUS_ACCESS_DENIED;
959 goto err_root_exit;
960 }
961 }
962
963 #ifdef WITH_FAKE_KASERVER
964 if (lp_afs_share(snum)) {
965 afs_login(conn);
966 }
967 #endif
968
969 /* Add veto/hide lists */
970 if (!IS_IPC(conn) && !IS_PRINT(conn)) {
971 set_namearray( &conn->veto_list, lp_veto_files(snum));
972 set_namearray( &conn->hide_list, lp_hide_files(snum));
973 set_namearray( &conn->veto_oplock_list, lp_veto_oplocks(snum));
974 set_namearray( &conn->aio_write_behind_list,
975 lp_aio_write_behind(snum));
976 }
977
978 /* Invoke VFS make connection hook - do this before the VFS_STAT call
979 to allow any filesystems needing user credentials to initialize
980 themselves. */
981
982 if (SMB_VFS_CONNECT(conn, lp_servicename(snum),
983 conn->server_info->unix_name) < 0) {
984 DEBUG(0,("make_connection: VFS make connection failed!\n"));
985 *pstatus = NT_STATUS_UNSUCCESSFUL;
986 goto err_root_exit;
987 }
988
989 /* Any error exit after here needs to call the disconnect hook. */
990 on_err_call_dis_hook = true;
991
992 status = create_synthetic_smb_fname(talloc_tos(), conn->connectpath,
993 NULL, NULL, &smb_fname_cpath);
994 if (!NT_STATUS_IS_OK(status)) {
995 *pstatus = status;
996 goto err_root_exit;
997 }
998
999 /* win2000 does not check the permissions on the directory
1000 during the tree connect, instead relying on permission
1001 check during individual operations. To match this behaviour
1002 I have disabled this chdir check (tridge) */
1003 /* the alternative is just to check the directory exists */
1004 if ((ret = SMB_VFS_STAT(conn, smb_fname_cpath)) != 0 ||
1005 !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
1006 if (ret == 0 && !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
1007 DEBUG(0,("'%s' is not a directory, when connecting to "
1008 "[%s]\n", conn->connectpath,
1009 lp_servicename(snum)));
1010 } else {
1011 DEBUG(0,("'%s' does not exist or permission denied "
1012 "when connecting to [%s] Error was %s\n",
1013 conn->connectpath, lp_servicename(snum),
1014 strerror(errno) ));
1015 }
1016 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
1017 goto err_root_exit;
1018 }
1019
1020 string_set(&conn->origpath,conn->connectpath);
1021
1022 #if SOFTLINK_OPTIMISATION
1023 /* resolve any soft links early if possible */
1024 if (vfs_ChDir(conn,conn->connectpath) == 0) {
1025 TALLOC_CTX *ctx = talloc_tos();
1026 char *s = vfs_GetWd(ctx,s);
1027 if (!s) {
1028 *status = map_nt_error_from_unix(errno);
1029 goto err_root_exit;
1030 }
1031 if (!set_conn_connectpath(conn,s)) {
1032 *status = NT_STATUS_NO_MEMORY;
1033 goto err_root_exit;
1034 }
1035 vfs_ChDir(conn,conn->connectpath);
1036 }
1037 #endif
1038
1039 /* Figure out the characteristics of the underlying filesystem. This
1040 * assumes that all the filesystem mounted withing a share path have
1041 * the same characteristics, which is likely but not guaranteed.
1042 */
1043
1044 conn->fs_capabilities = SMB_VFS_FS_CAPABILITIES(conn);
1045
1046 /*
1047 * Print out the 'connected as' stuff here as we need
1048 * to know the effective uid and gid we will be using
1049 * (at least initially).
1050 */
1051
1052 if( DEBUGLVL( IS_IPC(conn) ? 3 : 1 ) ) {
1053 dbgtext( "%s (%s) ", get_remote_machine_name(),
1054 conn->client_address );
1055 dbgtext( "%s", srv_is_signing_active(smbd_server_conn) ? "signed " : "");
1056 dbgtext( "connect to service %s ", lp_servicename(snum) );
1057 dbgtext( "initially as user %s ",
1058 conn->server_info->unix_name );
1059 dbgtext( "(uid=%d, gid=%d) ", (int)geteuid(), (int)getegid() );
1060 dbgtext( "(pid %d)\n", (int)sys_getpid() );
1061 }
1062
1063 /* we've finished with the user stuff - go back to root */
1064 change_to_root_user();
1065 return(conn);
1066
1067 err_root_exit:
1068 TALLOC_FREE(smb_fname_cpath);
1069 change_to_root_user();
1070 if (on_err_call_dis_hook) {
1071 /* Call VFS disconnect hook */
1072 SMB_VFS_DISCONNECT(conn);
1073 }
1074 yield_connection(conn, lp_servicename(snum));
1075 conn_free(sconn, conn);
1076 return NULL;
1077 }
1078
1079 /****************************************************************************
1080 Make a connection to a service.
1081 *
1082 * @param service
1083 ****************************************************************************/
1084
1085 connection_struct *make_connection(struct smbd_server_connection *sconn,
1086 const char *service_in, DATA_BLOB password,
1087 const char *pdev, uint16 vuid,
1088 NTSTATUS *status)
1089 {
1090 uid_t euid;
1091 user_struct *vuser = NULL;
1092 fstring service;
1093 fstring dev;
1094 int snum = -1;
1095 char addr[INET6_ADDRSTRLEN];
1096
1097 fstrcpy(dev, pdev);
1098
1099 /* This must ONLY BE CALLED AS ROOT. As it exits this function as
1100 * root. */
1101 if (!non_root_mode() && (euid = geteuid()) != 0) {
1102 DEBUG(0,("make_connection: PANIC ERROR. Called as nonroot "
1103 "(%u)\n", (unsigned int)euid ));
1104 smb_panic("make_connection: PANIC ERROR. Called as nonroot\n");
1105 }
1106
1107 if (conn_num_open(sconn) > 2047) {
1108 *status = NT_STATUS_INSUFF_SERVER_RESOURCES;
1109 return NULL;
1110 }
1111
1112 if(lp_security() != SEC_SHARE) {
1113 vuser = get_valid_user_struct(sconn, vuid);
1114 if (!vuser) {
1115 DEBUG(1,("make_connection: refusing to connect with "
1116 "no session setup\n"));
1117 *status = NT_STATUS_ACCESS_DENIED;
1118 return NULL;
1119 }
1120 }
1121
1122 /* Logic to try and connect to the correct [homes] share, preferably
1123 without too many getpwnam() lookups. This is particulary nasty for
1124 winbind usernames, where the share name isn't the same as unix
1125 username.
1126
1127 The snum of the homes share is stored on the vuser at session setup
1128 time.
1129 */
1130
1131 if (strequal(service_in,HOMES_NAME)) {
1132 if(lp_security() != SEC_SHARE) {
1133 DATA_BLOB no_pw = data_blob_null;
1134 if (vuser->homes_snum == -1) {
1135 DEBUG(2, ("[homes] share not available for "
1136 "this user because it was not found "
1137 "or created at session setup "
1138 "time\n"));
1139 *status = NT_STATUS_BAD_NETWORK_NAME;
1140 return NULL;
1141 }
1142 DEBUG(5, ("making a connection to [homes] service "
1143 "created at session setup time\n"));
1144 return make_connection_snum(sconn,
1145 vuser->homes_snum,
1146 vuser, no_pw,
1147 dev, status);
1148 } else {
1149 /* Security = share. Try with
1150 * current_user_info.smb_name as the username. */
1151 if (*current_user_info.smb_name) {
1152 fstring unix_username;
1153 fstrcpy(unix_username,
1154 current_user_info.smb_name);
1155 map_username(sconn, unix_username);
1156 snum = find_service(unix_username);
1157 }
1158 if (snum != -1) {
1159 DEBUG(5, ("making a connection to 'homes' "
1160 "service %s based on "
1161 "security=share\n", service_in));
1162 return make_connection_snum(sconn,
1163 snum, NULL,
1164 password,
1165 dev, status);
1166 }
1167 }
1168 } else if ((lp_security() != SEC_SHARE) && (vuser->homes_snum != -1)
1169 && strequal(service_in,
1170 lp_servicename(vuser->homes_snum))) {
1171 DATA_BLOB no_pw = data_blob_null;
1172 DEBUG(5, ("making a connection to 'homes' service [%s] "
1173 "created at session setup time\n", service_in));
1174 return make_connection_snum(sconn,
1175 vuser->homes_snum,
1176 vuser, no_pw,
1177 dev, status);
1178 }
1179
1180 fstrcpy(service, service_in);
1181
1182 strlower_m(service);
1183
1184 snum = find_service(service);
1185
1186 if (snum < 0) {
1187 if (strequal(service,"IPC$") ||
1188 (lp_enable_asu_support() && strequal(service,"ADMIN$"))) {
1189 DEBUG(3,("refusing IPC connection to %s\n", service));
1190 *status = NT_STATUS_ACCESS_DENIED;
1191 return NULL;
1192 }
1193
1194 DEBUG(0,("%s (%s) couldn't find service %s\n",
1195 get_remote_machine_name(),
1196 client_addr(get_client_fd(),addr,sizeof(addr)),
1197 service));
1198 *status = NT_STATUS_BAD_NETWORK_NAME;
1199 return NULL;
1200 }
1201
1202 /* Handle non-Dfs clients attempting connections to msdfs proxy */
1203 if (lp_host_msdfs() && (*lp_msdfs_proxy(snum) != '\0')) {
1204 DEBUG(3, ("refusing connection to dfs proxy share '%s' "
1205 "(pointing to %s)\n",
1206 service, lp_msdfs_proxy(snum)));
1207 *status = NT_STATUS_BAD_NETWORK_NAME;
1208 return NULL;
1209 }
1210
1211 DEBUG(5, ("making a connection to 'normal' service %s\n", service));
1212
1213 return make_connection_snum(sconn, snum, vuser,
1214 password,
1215 dev, status);
1216 }
1217
1218 /****************************************************************************
1219 Close a cnum.
1220 ****************************************************************************/
1221
1222 void close_cnum(struct smbd_server_connection *sconn,
1223 connection_struct *conn, uint16 vuid)
1224 {
1225 file_close_conn(conn);
1226
1227 if (!IS_IPC(conn)) {
1228 dptr_closecnum(conn);
1229 }
1230
1231 change_to_root_user();
1232
1233 DEBUG(IS_IPC(conn)?3:1, ("%s (%s) closed connection to service %s\n",
1234 get_remote_machine_name(),
1235 conn->client_address,
1236 lp_servicename(SNUM(conn))));
1237
1238 /* Call VFS disconnect hook */
1239 SMB_VFS_DISCONNECT(conn);
1240
1241 yield_connection(conn, lp_servicename(SNUM(conn)));
1242
1243 /* make sure we leave the directory available for unmount */
1244 vfs_ChDir(conn, "/");
1245
1246 /* execute any "postexec = " line */
1247 if (*lp_postexec(SNUM(conn)) &&
1248 change_to_user(conn, vuid)) {
1249 char *cmd = talloc_sub_advanced(talloc_tos(),
1250 lp_servicename(SNUM(conn)),
1251 conn->server_info->unix_name,
1252 conn->connectpath,
1253 conn->server_info->utok.gid,
1254 conn->server_info->sanitized_username,
1255 pdb_get_domain(conn->server_info->sam_account),
1256 lp_postexec(SNUM(conn)));
1257 smbrun(cmd,NULL);
1258 TALLOC_FREE(cmd);
1259 change_to_root_user();
1260 }
1261
1262 change_to_root_user();
1263 /* execute any "root postexec = " line */
1264 if (*lp_rootpostexec(SNUM(conn))) {
1265 char *cmd = talloc_sub_advanced(talloc_tos(),
1266 lp_servicename(SNUM(conn)),
1267 conn->server_info->unix_name,
1268 conn->connectpath,
1269 conn->server_info->utok.gid,
1270 conn->server_info->sanitized_username,
1271 pdb_get_domain(conn->server_info->sam_account),
1272 lp_rootpostexec(SNUM(conn)));
1273 smbrun(cmd,NULL);
1274 TALLOC_FREE(cmd);
1275 }
1276
1277 conn_free(sconn, conn);
1278 }
reg import