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Fix bug 8710 - connections.tdb - major leak with SMB2.
[Samba.git] / source3 / smbd / service.c
blob34b24f31e1d0d3c2c83c813fc5323c69643c40cb
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 "system/filesys.h"
22 #include "../lib/tsocket/tsocket.h"
23 #include "smbd/smbd.h"
24 #include "smbd/globals.h"
25 #include "../librpc/gen_ndr/netlogon.h"
26 #include "../libcli/security/security.h"
27 #include "printing/pcap.h"
28 #include "passdb/lookup_sid.h"
29 #include "auth.h"
30
31 extern userdom_struct current_user_info;
32
33 static bool canonicalize_connect_path(connection_struct *conn)
34 {
35 bool ret;
36 char *resolved_name = SMB_VFS_REALPATH(conn,conn->connectpath);
37 if (!resolved_name) {
38 return false;
39 }
40 ret = set_conn_connectpath(conn,resolved_name);
41 SAFE_FREE(resolved_name);
42 return ret;
43 }
44
45 /****************************************************************************
46 Ensure when setting connectpath it is a canonicalized (no ./ // or ../)
47 absolute path stating in / and not ending in /.
48 Observent people will notice a similarity between this and check_path_syntax :-).
49 ****************************************************************************/
50
51 bool set_conn_connectpath(connection_struct *conn, const char *connectpath)
52 {
53 char *destname;
54 char *d;
55 const char *s = connectpath;
56 bool start_of_name_component = true;
57
58 if (connectpath == NULL || connectpath[0] == '\0') {
59 return false;
60 }
61
62 /* Allocate for strlen + '\0' + possible leading '/' */
63 destname = (char *)SMB_MALLOC(strlen(connectpath) + 2);
64 if (!destname) {
65 return false;
66 }
67 d = destname;
68
69 *d++ = '/'; /* Always start with root. */
70
71 while (*s) {
72 if (*s == '/') {
73 /* Eat multiple '/' */
74 while (*s == '/') {
75 s++;
76 }
77 if ((d > destname + 1) && (*s != '\0')) {
78 *d++ = '/';
79 }
80 start_of_name_component = True;
81 continue;
82 }
83
84 if (start_of_name_component) {
85 if ((s[0] == '.') && (s[1] == '.') && (s[2] == '/' || s[2] == '\0')) {
86 /* Uh oh - "/../" or "/..\0" ! */
87
88 /* Go past the ../ or .. */
89 if (s[2] == '/') {
90 s += 3;
91 } else {
92 s += 2; /* Go past the .. */
93 }
94
95 /* If we just added a '/' - delete it */
96 if ((d > destname) && (*(d-1) == '/')) {
97 *(d-1) = '\0';
98 d--;
99 }
100
101 /* Are we at the start ? Can't go back further if so. */
102 if (d <= destname) {
103 *d++ = '/'; /* Can't delete root */
104 continue;
105 }
106 /* Go back one level... */
107 /* Decrement d first as d points to the *next* char to write into. */
108 for (d--; d > destname; d--) {
109 if (*d == '/') {
110 break;
111 }
112 }
113 /* We're still at the start of a name component, just the previous one. */
114 continue;
115 } else if ((s[0] == '.') && ((s[1] == '\0') || s[1] == '/')) {
116 /* Component of pathname can't be "." only - skip the '.' . */
117 if (s[1] == '/') {
118 s += 2;
119 } else {
120 s++;
121 }
122 continue;
123 }
124 }
125
126 if (!(*s & 0x80)) {
127 *d++ = *s++;
128 } else {
129 size_t siz;
130 /* Get the size of the next MB character. */
131 next_codepoint(s,&siz);
132 switch(siz) {
133 case 5:
134 *d++ = *s++;
135 /*fall through*/
136 case 4:
137 *d++ = *s++;
138 /*fall through*/
139 case 3:
140 *d++ = *s++;
141 /*fall through*/
142 case 2:
143 *d++ = *s++;
144 /*fall through*/
145 case 1:
146 *d++ = *s++;
147 break;
148 default:
149 break;
150 }
151 }
152 start_of_name_component = false;
153 }
154 *d = '\0';
155
156 /* And must not end in '/' */
157 if (d > destname + 1 && (*(d-1) == '/')) {
158 *(d-1) = '\0';
159 }
160
161 DEBUG(10,("set_conn_connectpath: service %s, connectpath = %s\n",
162 lp_servicename(SNUM(conn)), destname ));
163
164 string_set(&conn->connectpath, destname);
165 SAFE_FREE(destname);
166 return true;
167 }
168
169 /****************************************************************************
170 Load parameters specific to a connection/service.
171 ****************************************************************************/
172
173 bool set_current_service(connection_struct *conn, uint16 flags, bool do_chdir)
174 {
175 int snum;
176
177 if (!conn) {
178 last_conn = NULL;
179 return(False);
180 }
181
182 conn->lastused_count++;
183
184 snum = SNUM(conn);
185
186 if (do_chdir &&
187 vfs_ChDir(conn,conn->connectpath) != 0 &&
188 vfs_ChDir(conn,conn->origpath) != 0) {
189 DEBUG(((errno!=EACCES)?0:3),("chdir (%s) failed, reason: %s\n",
190 conn->connectpath, strerror(errno)));
191 return(False);
192 }
193
194 if ((conn == last_conn) && (last_flags == flags)) {
195 return(True);
196 }
197
198 last_conn = conn;
199 last_flags = flags;
200
201 /* Obey the client case sensitivity requests - only for clients that support it. */
202 switch (lp_casesensitive(snum)) {
203 case Auto:
204 {
205 /* We need this uglyness due to DOS/Win9x clients that lie about case insensitivity. */
206 enum remote_arch_types ra_type = get_remote_arch();
207 if ((ra_type != RA_SAMBA) && (ra_type != RA_CIFSFS)) {
208 /* Client can't support per-packet case sensitive pathnames. */
209 conn->case_sensitive = False;
210 } else {
211 conn->case_sensitive = !(flags & FLAG_CASELESS_PATHNAMES);
212 }
213 }
214 break;
215 case True:
216 conn->case_sensitive = True;
217 break;
218 default:
219 conn->case_sensitive = False;
220 break;
221 }
222 return(True);
223 }
224
225 static int load_registry_service(const char *servicename)
226 {
227 if (!lp_registry_shares()) {
228 return -1;
229 }
230
231 if ((servicename == NULL) || (*servicename == '\0')) {
232 return -1;
233 }
234
235 if (strequal(servicename, GLOBAL_NAME)) {
236 return -2;
237 }
238
239 if (!process_registry_service(servicename)) {
240 return -1;
241 }
242
243 return lp_servicenumber(servicename);
244 }
245
246 void load_registry_shares(void)
247 {
248 DEBUG(8, ("load_registry_shares()\n"));
249 if (!lp_registry_shares()) {
250 return;
251 }
252
253 process_registry_shares();
254
255 return;
256 }
257
258 /****************************************************************************
259 Add a home service. Returns the new service number or -1 if fail.
260 ****************************************************************************/
261
262 int add_home_service(const char *service, const char *username, const char *homedir)
263 {
264 int iHomeService;
265
266 if (!service || !homedir || homedir[0] == '\0')
267 return -1;
268
269 if ((iHomeService = lp_servicenumber(HOMES_NAME)) < 0) {
270 if ((iHomeService = load_registry_service(HOMES_NAME)) < 0) {
271 return -1;
272 }
273 }
274
275 /*
276 * If this is a winbindd provided username, remove
277 * the domain component before adding the service.
278 * Log a warning if the "path=" parameter does not
279 * include any macros.
280 */
281
282 {
283 const char *p = strchr(service,*lp_winbind_separator());
284
285 /* We only want the 'user' part of the string */
286 if (p) {
287 service = p + 1;
288 }
289 }
290
291 if (!lp_add_home(service, iHomeService, username, homedir)) {
292 return -1;
293 }
294
295 return lp_servicenumber(service);
296
297 }
298
299 /**
300 * Find a service entry.
301 *
302 * @param service is modified (to canonical form??)
303 **/
304
305 int find_service(TALLOC_CTX *ctx, const char *service_in, char **p_service_out)
306 {
307 int iService;
308
309 if (!service_in) {
310 return -1;
311 }
312
313 /* First make a copy. */
314 *p_service_out = talloc_strdup(ctx, service_in);
315 if (!*p_service_out) {
316 return -1;
317 }
318
319 all_string_sub(*p_service_out,"\\","/",0);
320
321 iService = lp_servicenumber(*p_service_out);
322
323 /* now handle the special case of a home directory */
324 if (iService < 0) {
325 char *phome_dir = get_user_home_dir(ctx, *p_service_out);
326
327 if(!phome_dir) {
328 /*
329 * Try mapping the servicename, it may
330 * be a Windows to unix mapped user name.
331 */
332 if(map_username(ctx, *p_service_out, p_service_out)) {
333 if (*p_service_out == NULL) {
334 /* Out of memory. */
335 return -1;
336 }
337 phome_dir = get_user_home_dir(
338 ctx, *p_service_out);
339 }
340 }
341
342 DEBUG(3,("checking for home directory %s gave %s\n",*p_service_out,
343 phome_dir?phome_dir:"(NULL)"));
344
345 iService = add_home_service(*p_service_out,*p_service_out /* 'username' */, phome_dir);
346 }
347
348 /* If we still don't have a service, attempt to add it as a printer. */
349 if (iService < 0) {
350 int iPrinterService;
351
352 if ((iPrinterService = lp_servicenumber(PRINTERS_NAME)) < 0) {
353 iPrinterService = load_registry_service(PRINTERS_NAME);
354 }
355 if (iPrinterService >= 0) {
356 DEBUG(3,("checking whether %s is a valid printer name...\n",
357 *p_service_out));
358 if (pcap_printername_ok(*p_service_out)) {
359 DEBUG(3,("%s is a valid printer name\n",
360 *p_service_out));
361 DEBUG(3,("adding %s as a printer service\n",
362 *p_service_out));
363 lp_add_printer(*p_service_out, iPrinterService);
364 iService = lp_servicenumber(*p_service_out);
365 if (iService < 0) {
366 DEBUG(0,("failed to add %s as a printer service!\n",
367 *p_service_out));
368 }
369 } else {
370 DEBUG(3,("%s is not a valid printer name\n",
371 *p_service_out));
372 }
373 }
374 }
375
376 /* Check for default vfs service? Unsure whether to implement this */
377 if (iService < 0) {
378 }
379
380 if (iService < 0) {
381 iService = load_registry_service(*p_service_out);
382 }
383
384 /* Is it a usershare service ? */
385 if (iService < 0 && *lp_usershare_path()) {
386 /* Ensure the name is canonicalized. */
387 strlower_m(*p_service_out);
388 iService = load_usershare_service(*p_service_out);
389 }
390
391 /* just possibly it's a default service? */
392 if (iService < 0) {
393 char *pdefservice = lp_defaultservice();
394 if (pdefservice &&
395 *pdefservice &&
396 !strequal(pdefservice, *p_service_out)
397 && !strstr_m(*p_service_out,"..")) {
398 /*
399 * We need to do a local copy here as lp_defaultservice()
400 * returns one of the rotating lp_string buffers that
401 * could get overwritten by the recursive find_service() call
402 * below. Fix from Josef Hinteregger <joehtg@joehtg.co.at>.
403 */
404 char *defservice = talloc_strdup(ctx, pdefservice);
405
406 if (!defservice) {
407 goto fail;
408 }
409
410 /* Disallow anything except explicit share names. */
411 if (strequal(defservice,HOMES_NAME) ||
412 strequal(defservice, PRINTERS_NAME) ||
413 strequal(defservice, "IPC$")) {
414 TALLOC_FREE(defservice);
415 goto fail;
416 }
417
418 iService = find_service(ctx, defservice, p_service_out);
419 if (!*p_service_out) {
420 TALLOC_FREE(defservice);
421 iService = -1;
422 goto fail;
423 }
424 if (iService >= 0) {
425 all_string_sub(*p_service_out, "_","/",0);
426 iService = lp_add_service(*p_service_out, iService);
427 }
428 TALLOC_FREE(defservice);
429 }
430 }
431
432 if (iService >= 0) {
433 if (!VALID_SNUM(iService)) {
434 DEBUG(0,("Invalid snum %d for %s\n",iService,
435 *p_service_out));
436 iService = -1;
437 }
438 }
439
440 fail:
441
442 if (iService < 0) {
443 DEBUG(3,("find_service() failed to find service %s\n",
444 *p_service_out));
445 }
446
447 return (iService);
448 }
449
450
451 /****************************************************************************
452 do some basic sainity checks on the share.
453 This function modifies dev, ecode.
454 ****************************************************************************/
455
456 static NTSTATUS share_sanity_checks(struct client_address *client_id, int snum,
457 fstring dev)
458 {
459 if (!lp_snum_ok(snum) ||
460 !allow_access(lp_hostsdeny(snum), lp_hostsallow(snum),
461 client_id->name, client_id->addr)) {
462 return NT_STATUS_ACCESS_DENIED;
463 }
464
465 if (dev[0] == '?' || !dev[0]) {
466 if (lp_print_ok(snum)) {
467 fstrcpy(dev,"LPT1:");
468 } else if (strequal(lp_fstype(snum), "IPC")) {
469 fstrcpy(dev, "IPC");
470 } else {
471 fstrcpy(dev,"A:");
472 }
473 }
474
475 strupper_m(dev);
476
477 if (lp_print_ok(snum)) {
478 if (!strequal(dev, "LPT1:")) {
479 return NT_STATUS_BAD_DEVICE_TYPE;
480 }
481 } else if (strequal(lp_fstype(snum), "IPC")) {
482 if (!strequal(dev, "IPC")) {
483 return NT_STATUS_BAD_DEVICE_TYPE;
484 }
485 } else if (!strequal(dev, "A:")) {
486 return NT_STATUS_BAD_DEVICE_TYPE;
487 }
488
489 /* Behave as a printer if we are supposed to */
490 if (lp_print_ok(snum) && (strcmp(dev, "A:") == 0)) {
491 fstrcpy(dev, "LPT1:");
492 }
493
494 return NT_STATUS_OK;
495 }
496
497 /*
498 * Go through lookup_name etc to find the force'd group.
499 *
500 * Create a new token from src_token, replacing the primary group sid with the
501 * one found.
502 */
503
504 static NTSTATUS find_forced_group(bool force_user,
505 int snum, const char *username,
506 struct dom_sid *pgroup_sid,
507 gid_t *pgid)
508 {
509 NTSTATUS result = NT_STATUS_NO_SUCH_GROUP;
510 TALLOC_CTX *frame = talloc_stackframe();
511 struct dom_sid group_sid;
512 enum lsa_SidType type;
513 char *groupname;
514 bool user_must_be_member = False;
515 gid_t gid;
516
517 groupname = talloc_strdup(talloc_tos(), lp_force_group(snum));
518 if (groupname == NULL) {
519 DEBUG(1, ("talloc_strdup failed\n"));
520 result = NT_STATUS_NO_MEMORY;
521 goto done;
522 }
523
524 if (groupname[0] == '+') {
525 user_must_be_member = True;
526 groupname += 1;
527 }
528
529 groupname = talloc_string_sub(talloc_tos(), groupname,
530 "%S", lp_servicename(snum));
531 if (groupname == NULL) {
532 DEBUG(1, ("talloc_string_sub failed\n"));
533 result = NT_STATUS_NO_MEMORY;
534 goto done;
535 }
536
537 if (!lookup_name_smbconf(talloc_tos(), groupname,
538 LOOKUP_NAME_ALL|LOOKUP_NAME_GROUP,
539 NULL, NULL, &group_sid, &type)) {
540 DEBUG(10, ("lookup_name_smbconf(%s) failed\n",
541 groupname));
542 goto done;
543 }
544
545 if ((type != SID_NAME_DOM_GRP) && (type != SID_NAME_ALIAS) &&
546 (type != SID_NAME_WKN_GRP)) {
547 DEBUG(10, ("%s is a %s, not a group\n", groupname,
548 sid_type_lookup(type)));
549 goto done;
550 }
551
552 if (!sid_to_gid(&group_sid, &gid)) {
553 DEBUG(10, ("sid_to_gid(%s) for %s failed\n",
554 sid_string_dbg(&group_sid), groupname));
555 goto done;
556 }
557
558 /*
559 * If the user has been forced and the forced group starts with a '+',
560 * then we only set the group to be the forced group if the forced
561 * user is a member of that group. Otherwise, the meaning of the '+'
562 * would be ignored.
563 */
564
565 if (force_user && user_must_be_member) {
566 if (user_in_group_sid(username, &group_sid)) {
567 sid_copy(pgroup_sid, &group_sid);
568 *pgid = gid;
569 DEBUG(3,("Forced group %s for member %s\n",
570 groupname, username));
571 } else {
572 DEBUG(0,("find_forced_group: forced user %s is not a member "
573 "of forced group %s. Disallowing access.\n",
574 username, groupname ));
575 result = NT_STATUS_MEMBER_NOT_IN_GROUP;
576 goto done;
577 }
578 } else {
579 sid_copy(pgroup_sid, &group_sid);
580 *pgid = gid;
581 DEBUG(3,("Forced group %s\n", groupname));
582 }
583
584 result = NT_STATUS_OK;
585 done:
586 TALLOC_FREE(frame);
587 return result;
588 }
589
590 /****************************************************************************
591 Create an auth_serversupplied_info structure for a connection_struct
592 ****************************************************************************/
593
594 static NTSTATUS create_connection_session_info(struct smbd_server_connection *sconn,
595 TALLOC_CTX *mem_ctx, int snum,
596 struct auth_serversupplied_info *vuid_serverinfo,
597 DATA_BLOB password,
598 struct auth_serversupplied_info **presult)
599 {
600 if (lp_guest_only(snum)) {
601 return make_server_info_guest(mem_ctx, presult);
602 }
603
604 if (vuid_serverinfo != NULL) {
605
606 struct auth_serversupplied_info *result;
607
608 /*
609 * This is the normal security != share case where we have a
610 * valid vuid from the session setup. */
611
612 if (vuid_serverinfo->guest) {
613 if (!lp_guest_ok(snum)) {
614 DEBUG(2, ("guest user (from session setup) "
615 "not permitted to access this share "
616 "(%s)\n", lp_servicename(snum)));
617 return NT_STATUS_ACCESS_DENIED;
618 }
619 } else {
620 if (!user_ok_token(vuid_serverinfo->unix_name,
621 vuid_serverinfo->info3->base.domain.string,
622 vuid_serverinfo->security_token, snum)) {
623 DEBUG(2, ("user '%s' (from session setup) not "
624 "permitted to access this share "
625 "(%s)\n",
626 vuid_serverinfo->unix_name,
627 lp_servicename(snum)));
628 return NT_STATUS_ACCESS_DENIED;
629 }
630 }
631
632 result = copy_serverinfo(mem_ctx, vuid_serverinfo);
633 if (result == NULL) {
634 return NT_STATUS_NO_MEMORY;
635 }
636
637 *presult = result;
638 return NT_STATUS_OK;
639 }
640
641 if (lp_security() == SEC_SHARE) {
642
643 fstring user;
644 bool guest;
645
646 /* add the sharename as a possible user name if we
647 are in share mode security */
648
649 add_session_user(sconn, lp_servicename(snum));
650
651 /* shall we let them in? */
652
653 if (!authorise_login(sconn, snum,user,password,&guest)) {
654 DEBUG( 2, ( "Invalid username/password for [%s]\n",
655 lp_servicename(snum)) );
656 return NT_STATUS_WRONG_PASSWORD;
657 }
658
659 return make_serverinfo_from_username(mem_ctx, user, guest,
660 presult);
661 }
662
663 DEBUG(0, ("invalid VUID (vuser) but not in security=share\n"));
664 return NT_STATUS_ACCESS_DENIED;
665 }
666
667 /****************************************************************************
668 set relavent user and group settings corresponding to force user/group
669 configuration for the given snum.
670 ****************************************************************************/
671
672 NTSTATUS set_conn_force_user_group(connection_struct *conn, int snum)
673 {
674 NTSTATUS status;
675
676 if (*lp_force_user(snum)) {
677
678 /*
679 * Replace conn->session_info with a completely faked up one
680 * from the username we are forced into :-)
681 */
682
683 char *fuser;
684 struct auth_serversupplied_info *forced_serverinfo;
685
686 fuser = talloc_string_sub(conn, lp_force_user(snum), "%S",
687 lp_const_servicename(snum));
688 if (fuser == NULL) {
689 return NT_STATUS_NO_MEMORY;
690 }
691
692 status = make_serverinfo_from_username(
693 conn, fuser, conn->session_info->guest,
694 &forced_serverinfo);
695 if (!NT_STATUS_IS_OK(status)) {
696 return status;
697 }
698
699 TALLOC_FREE(conn->session_info);
700 conn->session_info = forced_serverinfo;
701
702 conn->force_user = true;
703 DEBUG(3,("Forced user %s\n", fuser));
704 }
705
706 /*
707 * If force group is true, then override
708 * any groupid stored for the connecting user.
709 */
710
711 if (*lp_force_group(snum)) {
712
713 status = find_forced_group(
714 conn->force_user, snum, conn->session_info->unix_name,
715 &conn->session_info->security_token->sids[1],
716 &conn->session_info->utok.gid);
717
718 if (!NT_STATUS_IS_OK(status)) {
719 return status;
720 }
721
722 /*
723 * We need to cache this gid, to use within
724 * change_to_user() separately from the conn->session_info
725 * struct. We only use conn->session_info directly if
726 * "force_user" was set.
727 */
728 conn->force_group_gid = conn->session_info->utok.gid;
729 }
730
731 return NT_STATUS_OK;
732 }
733
734 /****************************************************************************
735 Make a connection, given the snum to connect to, and the vuser of the
736 connecting user if appropriate.
737 ****************************************************************************/
738
739 static connection_struct *make_connection_snum(struct smbd_server_connection *sconn,
740 connection_struct *conn,
741 int snum, user_struct *vuser,
742 DATA_BLOB password,
743 const char *pdev,
744 NTSTATUS *pstatus)
745 {
746 struct smb_filename *smb_fname_cpath = NULL;
747 fstring dev;
748 int ret;
749 bool on_err_call_dis_hook = false;
750 bool claimed_connection = false;
751 uid_t effuid;
752 gid_t effgid;
753 NTSTATUS status;
754
755 fstrcpy(dev, pdev);
756
757 *pstatus = share_sanity_checks(&sconn->client_id, snum, dev);
758 if (NT_STATUS_IS_ERR(*pstatus)) {
759 goto err_root_exit;
760 }
761
762 conn->params->service = snum;
763
764 status = create_connection_session_info(sconn,
765 conn, snum, vuser ? vuser->session_info : NULL, password,
766 &conn->session_info);
767
768 if (!NT_STATUS_IS_OK(status)) {
769 DEBUG(1, ("create_connection_session_info failed: %s\n",
770 nt_errstr(status)));
771 *pstatus = status;
772 goto err_root_exit;
773 }
774
775 if ((lp_guest_only(snum)) || (lp_security() == SEC_SHARE)) {
776 conn->force_user = true;
777 }
778
779 add_session_user(sconn, conn->session_info->unix_name);
780
781 conn->num_files_open = 0;
782 conn->lastused = conn->lastused_count = time(NULL);
783 conn->used = True;
784 conn->printer = (strncmp(dev,"LPT",3) == 0);
785 conn->ipc = ( (strncmp(dev,"IPC",3) == 0) ||
786 ( lp_enable_asu_support() && strequal(dev,"ADMIN$")) );
787
788 /* Case options for the share. */
789 if (lp_casesensitive(snum) == Auto) {
790 /* We will be setting this per packet. Set to be case
791 * insensitive for now. */
792 conn->case_sensitive = False;
793 } else {
794 conn->case_sensitive = (bool)lp_casesensitive(snum);
795 }
796
797 conn->case_preserve = lp_preservecase(snum);
798 conn->short_case_preserve = lp_shortpreservecase(snum);
799
800 conn->encrypt_level = lp_smb_encrypt(snum);
801
802 conn->veto_list = NULL;
803 conn->hide_list = NULL;
804 conn->veto_oplock_list = NULL;
805 conn->aio_write_behind_list = NULL;
806
807 conn->read_only = lp_readonly(SNUM(conn));
808
809 status = set_conn_force_user_group(conn, snum);
810 if (!NT_STATUS_IS_OK(status)) {
811 *pstatus = status;
812 return NULL;
813 }
814
815 conn->vuid = (vuser != NULL) ? vuser->vuid : UID_FIELD_INVALID;
816
817 {
818 char *s = talloc_sub_advanced(talloc_tos(),
819 lp_servicename(SNUM(conn)),
820 conn->session_info->unix_name,
821 conn->connectpath,
822 conn->session_info->utok.gid,
823 conn->session_info->sanitized_username,
824 conn->session_info->info3->base.domain.string,
825 lp_pathname(snum));
826 if (!s) {
827 *pstatus = NT_STATUS_NO_MEMORY;
828 goto err_root_exit;
829 }
830
831 if (!set_conn_connectpath(conn,s)) {
832 TALLOC_FREE(s);
833 *pstatus = NT_STATUS_NO_MEMORY;
834 goto err_root_exit;
835 }
836 DEBUG(3,("Connect path is '%s' for service [%s]\n",s,
837 lp_servicename(snum)));
838 TALLOC_FREE(s);
839 }
840
841 /*
842 * New code to check if there's a share security descripter
843 * added from NT server manager. This is done after the
844 * smb.conf checks are done as we need a uid and token. JRA.
845 *
846 */
847
848 share_access_check(conn->session_info->security_token,
849 lp_servicename(snum), MAXIMUM_ALLOWED_ACCESS,
850 &conn->share_access);
851
852 if ((conn->share_access & FILE_WRITE_DATA) == 0) {
853 if ((conn->share_access & FILE_READ_DATA) == 0) {
854 /* No access, read or write. */
855 DEBUG(0,("make_connection: connection to %s "
856 "denied due to security "
857 "descriptor.\n",
858 lp_servicename(snum)));
859 *pstatus = NT_STATUS_ACCESS_DENIED;
860 goto err_root_exit;
861 } else {
862 conn->read_only = True;
863 }
864 }
865 /* Initialise VFS function pointers */
866
867 if (!smbd_vfs_init(conn)) {
868 DEBUG(0, ("vfs_init failed for service %s\n",
869 lp_servicename(snum)));
870 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
871 goto err_root_exit;
872 }
873
874 /* ROOT Activities: */
875 /* explicitly check widelinks here so that we can correctly warn
876 * in the logs. */
877 widelinks_warning(snum);
878
879 /*
880 * Enforce the max connections parameter.
881 */
882
883 if ((lp_max_connections(snum) > 0)
884 && (count_current_connections(lp_servicename(SNUM(conn)), True) >=
885 lp_max_connections(snum))) {
886
887 DEBUG(1, ("Max connections (%d) exceeded for %s\n",
888 lp_max_connections(snum), lp_servicename(snum)));
889 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
890 goto err_root_exit;
891 }
892
893 /*
894 * Get us an entry in the connections db
895 */
896 if (!claim_connection(conn, lp_servicename(snum))) {
897 DEBUG(1, ("Could not store connections entry\n"));
898 *pstatus = NT_STATUS_INTERNAL_DB_ERROR;
899 goto err_root_exit;
900 }
901 claimed_connection = true;
902
903 /* Invoke VFS make connection hook - this must be the first
904 filesystem operation that we do. */
905
906 if (SMB_VFS_CONNECT(conn, lp_servicename(snum),
907 conn->session_info->unix_name) < 0) {
908 DEBUG(0,("make_connection: VFS make connection failed!\n"));
909 *pstatus = NT_STATUS_UNSUCCESSFUL;
910 goto err_root_exit;
911 }
912
913 /* Any error exit after here needs to call the disconnect hook. */
914 on_err_call_dis_hook = true;
915
916 if ((!conn->printer) && (!conn->ipc)) {
917 conn->notify_ctx = notify_init(conn,
918 sconn_server_id(sconn),
919 sconn->msg_ctx,
920 smbd_event_context(),
921 conn);
922 }
923
924 /*
925 * Fix compatibility issue pointed out by Volker.
926 * We pass the conn->connectpath to the preexec
927 * scripts as a parameter, so attempt to canonicalize
928 * it here before calling the preexec scripts.
929 * We ignore errors here, as it is possible that
930 * the conn->connectpath doesn't exist yet and
931 * the preexec scripts will create them.
932 */
933
934 (void)canonicalize_connect_path(conn);
935
936 /* Preexecs are done here as they might make the dir we are to ChDir
937 * to below */
938 /* execute any "root preexec = " line */
939 if (*lp_rootpreexec(snum)) {
940 char *cmd = talloc_sub_advanced(talloc_tos(),
941 lp_servicename(SNUM(conn)),
942 conn->session_info->unix_name,
943 conn->connectpath,
944 conn->session_info->utok.gid,
945 conn->session_info->sanitized_username,
946 conn->session_info->info3->base.domain.string,
947 lp_rootpreexec(snum));
948 DEBUG(5,("cmd=%s\n",cmd));
949 ret = smbrun(cmd,NULL);
950 TALLOC_FREE(cmd);
951 if (ret != 0 && lp_rootpreexec_close(snum)) {
952 DEBUG(1,("root preexec gave %d - failing "
953 "connection\n", ret));
954 *pstatus = NT_STATUS_ACCESS_DENIED;
955 goto err_root_exit;
956 }
957 }
958
959 /* USER Activites: */
960 if (!change_to_user(conn, conn->vuid)) {
961 /* No point continuing if they fail the basic checks */
962 DEBUG(0,("Can't become connected user!\n"));
963 *pstatus = NT_STATUS_LOGON_FAILURE;
964 goto err_root_exit;
965 }
966
967 effuid = geteuid();
968 effgid = getegid();
969
970 /* Remember that a different vuid can connect later without these
971 * checks... */
972
973 /* Preexecs are done here as they might make the dir we are to ChDir
974 * to below */
975
976 /* execute any "preexec = " line */
977 if (*lp_preexec(snum)) {
978 char *cmd = talloc_sub_advanced(talloc_tos(),
979 lp_servicename(SNUM(conn)),
980 conn->session_info->unix_name,
981 conn->connectpath,
982 conn->session_info->utok.gid,
983 conn->session_info->sanitized_username,
984 conn->session_info->info3->base.domain.string,
985 lp_preexec(snum));
986 ret = smbrun(cmd,NULL);
987 TALLOC_FREE(cmd);
988 if (ret != 0 && lp_preexec_close(snum)) {
989 DEBUG(1,("preexec gave %d - failing connection\n",
990 ret));
991 *pstatus = NT_STATUS_ACCESS_DENIED;
992 goto err_root_exit;
993 }
994 }
995
996 #ifdef WITH_FAKE_KASERVER
997 if (lp_afs_share(snum)) {
998 afs_login(conn);
999 }
1000 #endif
1001
1002 /*
1003 * we've finished with the user stuff - go back to root
1004 * so the SMB_VFS_STAT call will only fail on path errors,
1005 * not permission problems.
1006 */
1007 change_to_root_user();
1008 /* ROOT Activites: */
1009
1010 /*
1011 * If widelinks are disallowed we need to canonicalise the connect
1012 * path here to ensure we don't have any symlinks in the
1013 * connectpath. We will be checking all paths on this connection are
1014 * below this directory. We must do this after the VFS init as we
1015 * depend on the realpath() pointer in the vfs table. JRA.
1016 */
1017 if (!lp_widelinks(snum)) {
1018 if (!canonicalize_connect_path(conn)) {
1019 DEBUG(0, ("canonicalize_connect_path failed "
1020 "for service %s, path %s\n",
1021 lp_servicename(snum),
1022 conn->connectpath));
1023 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
1024 goto err_root_exit;
1025 }
1026 }
1027
1028 /* Add veto/hide lists */
1029 if (!IS_IPC(conn) && !IS_PRINT(conn)) {
1030 set_namearray( &conn->veto_list, lp_veto_files(snum));
1031 set_namearray( &conn->hide_list, lp_hide_files(snum));
1032 set_namearray( &conn->veto_oplock_list, lp_veto_oplocks(snum));
1033 set_namearray( &conn->aio_write_behind_list,
1034 lp_aio_write_behind(snum));
1035 }
1036 status = create_synthetic_smb_fname(talloc_tos(), conn->connectpath,
1037 NULL, NULL, &smb_fname_cpath);
1038 if (!NT_STATUS_IS_OK(status)) {
1039 *pstatus = status;
1040 goto err_root_exit;
1041 }
1042
1043 /* win2000 does not check the permissions on the directory
1044 during the tree connect, instead relying on permission
1045 check during individual operations. To match this behaviour
1046 I have disabled this chdir check (tridge) */
1047 /* the alternative is just to check the directory exists */
1048
1049 if ((ret = SMB_VFS_STAT(conn, smb_fname_cpath)) != 0 ||
1050 !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
1051 if (ret == 0 && !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
1052 DEBUG(0,("'%s' is not a directory, when connecting to "
1053 "[%s]\n", conn->connectpath,
1054 lp_servicename(snum)));
1055 } else {
1056 DEBUG(0,("'%s' does not exist or permission denied "
1057 "when connecting to [%s] Error was %s\n",
1058 conn->connectpath, lp_servicename(snum),
1059 strerror(errno) ));
1060 }
1061 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
1062 goto err_root_exit;
1063 }
1064 conn->base_share_dev = smb_fname_cpath->st.st_ex_dev;
1065
1066 string_set(&conn->origpath,conn->connectpath);
1067
1068 /* Figure out the characteristics of the underlying filesystem. This
1069 * assumes that all the filesystem mounted withing a share path have
1070 * the same characteristics, which is likely but not guaranteed.
1071 */
1072
1073 conn->fs_capabilities = SMB_VFS_FS_CAPABILITIES(conn, &conn->ts_res);
1074
1075 /*
1076 * Print out the 'connected as' stuff here as we need
1077 * to know the effective uid and gid we will be using
1078 * (at least initially).
1079 */
1080
1081 if( DEBUGLVL( IS_IPC(conn) ? 3 : 1 ) ) {
1082 dbgtext( "%s (%s) ", get_remote_machine_name(),
1083 conn->sconn->client_id.addr );
1084 dbgtext( "%s", srv_is_signing_active(sconn) ? "signed " : "");
1085 dbgtext( "connect to service %s ", lp_servicename(snum) );
1086 dbgtext( "initially as user %s ",
1087 conn->session_info->unix_name );
1088 dbgtext( "(uid=%d, gid=%d) ", (int)effuid, (int)effgid );
1089 dbgtext( "(pid %d)\n", (int)sys_getpid() );
1090 }
1091
1092 return(conn);
1093
1094 err_root_exit:
1095 TALLOC_FREE(smb_fname_cpath);
1096 /* We must exit this function as root. */
1097 if (geteuid() != 0) {
1098 change_to_root_user();
1099 }
1100 if (on_err_call_dis_hook) {
1101 /* Call VFS disconnect hook */
1102 SMB_VFS_DISCONNECT(conn);
1103 }
1104 if (claimed_connection) {
1105 yield_connection(conn, lp_servicename(snum));
1106 }
1107 return NULL;
1108 }
1109
1110 /****************************************************************************
1111 Make a connection to a service from SMB1. Internal interface.
1112 ****************************************************************************/
1113
1114 static connection_struct *make_connection_smb1(struct smbd_server_connection *sconn,
1115 int snum, user_struct *vuser,
1116 DATA_BLOB password,
1117 const char *pdev,
1118 NTSTATUS *pstatus)
1119 {
1120 connection_struct *ret_conn = NULL;
1121 connection_struct *conn = conn_new(sconn);
1122 if (!conn) {
1123 DEBUG(0,("make_connection_smb1: Couldn't find free connection.\n"));
1124 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
1125 return NULL;
1126 }
1127 ret_conn = make_connection_snum(sconn,
1128 conn,
1129 snum,
1130 vuser,
1131 password,
1132 pdev,
1133 pstatus);
1134 if (ret_conn != conn) {
1135 conn_free(conn);
1136 return NULL;
1137 }
1138 return conn;
1139 }
1140
1141 /****************************************************************************
1142 Make a connection to a service from SMB2. External SMB2 interface.
1143 We must set cnum before claiming connection.
1144 ****************************************************************************/
1145
1146 connection_struct *make_connection_smb2(struct smbd_server_connection *sconn,
1147 struct smbd_smb2_tcon *tcon,
1148 user_struct *vuser,
1149 DATA_BLOB password,
1150 const char *pdev,
1151 NTSTATUS *pstatus)
1152 {
1153 connection_struct *ret_conn = NULL;
1154 connection_struct *conn = conn_new(sconn);
1155 if (!conn) {
1156 DEBUG(0,("make_connection_smb2: Couldn't find free connection.\n"));
1157 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
1158 return NULL;
1159 }
1160 conn->cnum = tcon->tid;
1161 ret_conn = make_connection_snum(sconn,
1162 conn,
1163 tcon->snum,
1164 vuser,
1165 password,
1166 pdev,
1167 pstatus);
1168 if (ret_conn != conn) {
1169 conn_free(conn);
1170 return NULL;
1171 }
1172 return conn;
1173 }
1174
1175 /****************************************************************************
1176 Make a connection to a service. External SMB1 interface.
1177 *
1178 * @param service
1179 ****************************************************************************/
1180
1181 connection_struct *make_connection(struct smbd_server_connection *sconn,
1182 const char *service_in, DATA_BLOB password,
1183 const char *pdev, uint16 vuid,
1184 NTSTATUS *status)
1185 {
1186 uid_t euid;
1187 user_struct *vuser = NULL;
1188 char *service = NULL;
1189 fstring dev;
1190 int snum = -1;
1191
1192 fstrcpy(dev, pdev);
1193
1194 /* This must ONLY BE CALLED AS ROOT. As it exits this function as
1195 * root. */
1196 if (!non_root_mode() && (euid = geteuid()) != 0) {
1197 DEBUG(0,("make_connection: PANIC ERROR. Called as nonroot "
1198 "(%u)\n", (unsigned int)euid ));
1199 smb_panic("make_connection: PANIC ERROR. Called as nonroot\n");
1200 }
1201
1202 if (conn_num_open(sconn) > 2047) {
1203 *status = NT_STATUS_INSUFF_SERVER_RESOURCES;
1204 return NULL;
1205 }
1206
1207 if(lp_security() != SEC_SHARE) {
1208 vuser = get_valid_user_struct(sconn, vuid);
1209 if (!vuser) {
1210 DEBUG(1,("make_connection: refusing to connect with "
1211 "no session setup\n"));
1212 *status = NT_STATUS_ACCESS_DENIED;
1213 return NULL;
1214 }
1215 }
1216
1217 /* Logic to try and connect to the correct [homes] share, preferably
1218 without too many getpwnam() lookups. This is particulary nasty for
1219 winbind usernames, where the share name isn't the same as unix
1220 username.
1221
1222 The snum of the homes share is stored on the vuser at session setup
1223 time.
1224 */
1225
1226 if (strequal(service_in,HOMES_NAME)) {
1227 if(lp_security() != SEC_SHARE) {
1228 DATA_BLOB no_pw = data_blob_null;
1229 if (vuser->homes_snum == -1) {
1230 DEBUG(2, ("[homes] share not available for "
1231 "this user because it was not found "
1232 "or created at session setup "
1233 "time\n"));
1234 *status = NT_STATUS_BAD_NETWORK_NAME;
1235 return NULL;
1236 }
1237 DEBUG(5, ("making a connection to [homes] service "
1238 "created at session setup time\n"));
1239 return make_connection_smb1(sconn,
1240 vuser->homes_snum,
1241 vuser, no_pw,
1242 dev, status);
1243 } else {
1244 /* Security = share. Try with
1245 * current_user_info.smb_name as the username. */
1246 if (*current_user_info.smb_name) {
1247 char *unix_username = NULL;
1248 (void)map_username(talloc_tos(),
1249 current_user_info.smb_name,
1250 &unix_username);
1251 snum = find_service(talloc_tos(),
1252 unix_username,
1253 &unix_username);
1254 if (!unix_username) {
1255 *status = NT_STATUS_NO_MEMORY;
1256 }
1257 return NULL;
1258 }
1259 if (snum != -1) {
1260 DEBUG(5, ("making a connection to 'homes' "
1261 "service %s based on "
1262 "security=share\n", service_in));
1263 return make_connection_smb1(sconn,
1264 snum, NULL,
1265 password,
1266 dev, status);
1267 }
1268 }
1269 } else if ((lp_security() != SEC_SHARE) && (vuser->homes_snum != -1)
1270 && strequal(service_in,
1271 lp_servicename(vuser->homes_snum))) {
1272 DATA_BLOB no_pw = data_blob_null;
1273 DEBUG(5, ("making a connection to 'homes' service [%s] "
1274 "created at session setup time\n", service_in));
1275 return make_connection_smb1(sconn,
1276 vuser->homes_snum,
1277 vuser, no_pw,
1278 dev, status);
1279 }
1280
1281 service = talloc_strdup(talloc_tos(), service_in);
1282 if (!service) {
1283 *status = NT_STATUS_NO_MEMORY;
1284 return NULL;
1285 }
1286
1287 strlower_m(service);
1288
1289 snum = find_service(talloc_tos(), service, &service);
1290 if (!service) {
1291 *status = NT_STATUS_NO_MEMORY;
1292 return NULL;
1293 }
1294
1295 if (snum < 0) {
1296 if (strequal(service,"IPC$") ||
1297 (lp_enable_asu_support() && strequal(service,"ADMIN$"))) {
1298 DEBUG(3,("refusing IPC connection to %s\n", service));
1299 *status = NT_STATUS_ACCESS_DENIED;
1300 return NULL;
1301 }
1302
1303 DEBUG(3,("%s (%s) couldn't find service %s\n",
1304 get_remote_machine_name(),
1305 tsocket_address_string(
1306 sconn->remote_address, talloc_tos()),
1307 service));
1308 *status = NT_STATUS_BAD_NETWORK_NAME;
1309 return NULL;
1310 }
1311
1312 /* Handle non-Dfs clients attempting connections to msdfs proxy */
1313 if (lp_host_msdfs() && (*lp_msdfs_proxy(snum) != '\0')) {
1314 DEBUG(3, ("refusing connection to dfs proxy share '%s' "
1315 "(pointing to %s)\n",
1316 service, lp_msdfs_proxy(snum)));
1317 *status = NT_STATUS_BAD_NETWORK_NAME;
1318 return NULL;
1319 }
1320
1321 DEBUG(5, ("making a connection to 'normal' service %s\n", service));
1322
1323 return make_connection_smb1(sconn, snum, vuser,
1324 password,
1325 dev, status);
1326 }
1327
1328 /****************************************************************************
1329 Close a cnum.
1330 ****************************************************************************/
1331
1332 void close_cnum(connection_struct *conn, uint16 vuid)
1333 {
1334 file_close_conn(conn);
1335
1336 if (!IS_IPC(conn)) {
1337 dptr_closecnum(conn);
1338 }
1339
1340 change_to_root_user();
1341
1342 DEBUG(IS_IPC(conn)?3:1, ("%s (%s) closed connection to service %s\n",
1343 get_remote_machine_name(),
1344 conn->sconn->client_id.addr,
1345 lp_servicename(SNUM(conn))));
1346
1347 /* Call VFS disconnect hook */
1348 SMB_VFS_DISCONNECT(conn);
1349
1350 yield_connection(conn, lp_servicename(SNUM(conn)));
1351
1352 /* make sure we leave the directory available for unmount */
1353 vfs_ChDir(conn, "/");
1354
1355 /* execute any "postexec = " line */
1356 if (*lp_postexec(SNUM(conn)) &&
1357 change_to_user(conn, vuid)) {
1358 char *cmd = talloc_sub_advanced(talloc_tos(),
1359 lp_servicename(SNUM(conn)),
1360 conn->session_info->unix_name,
1361 conn->connectpath,
1362 conn->session_info->utok.gid,
1363 conn->session_info->sanitized_username,
1364 conn->session_info->info3->base.domain.string,
1365 lp_postexec(SNUM(conn)));
1366 smbrun(cmd,NULL);
1367 TALLOC_FREE(cmd);
1368 change_to_root_user();
1369 }
1370
1371 change_to_root_user();
1372 /* execute any "root postexec = " line */
1373 if (*lp_rootpostexec(SNUM(conn))) {
1374 char *cmd = talloc_sub_advanced(talloc_tos(),
1375 lp_servicename(SNUM(conn)),
1376 conn->session_info->unix_name,
1377 conn->connectpath,
1378 conn->session_info->utok.gid,
1379 conn->session_info->sanitized_username,
1380 conn->session_info->info3->base.domain.string,
1381 lp_rootpostexec(SNUM(conn)));
1382 smbrun(cmd,NULL);
1383 TALLOC_FREE(cmd);
1384 }
1385
1386 conn_free(conn);
1387 }
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