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s3/smbd: Fix string buffer overflow causing heap corruption
[Samba/fernandojvsilva.git] / source3 / smbd / service.c
blobe8775ffd7b53be983fcfa128ddbf7951f7a98e48
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 /*
854 * If widelinks are disallowed we need to canonicalise the connect
855 * path here to ensure we don't have any symlinks in the
856 * connectpath. We will be checking all paths on this connection are
857 * below this directory. We must do this after the VFS init as we
858 * depend on the realpath() pointer in the vfs table. JRA.
859 */
860 if (!lp_widelinks(snum)) {
861 if (!canonicalize_connect_path(conn)) {
862 DEBUG(0, ("canonicalize_connect_path failed "
863 "for service %s, path %s\n",
864 lp_servicename(snum),
865 conn->connectpath));
866 conn_free(conn);
867 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
868 return NULL;
869 }
870 }
871
872 if ((!conn->printer) && (!conn->ipc)) {
873 conn->notify_ctx = notify_init(conn, server_id_self(),
874 smbd_messaging_context(),
875 smbd_event_context(),
876 conn);
877 }
878
879 /* ROOT Activities: */
880 /*
881 * Enforce the max connections parameter.
882 */
883
884 if ((lp_max_connections(snum) > 0)
885 && (count_current_connections(lp_servicename(SNUM(conn)), True) >=
886 lp_max_connections(snum))) {
887
888 DEBUG(1, ("Max connections (%d) exceeded for %s\n",
889 lp_max_connections(snum), lp_servicename(snum)));
890 conn_free(conn);
891 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
892 return NULL;
893 }
894
895 /*
896 * Get us an entry in the connections db
897 */
898 if (!claim_connection(conn, lp_servicename(snum), 0)) {
899 DEBUG(1, ("Could not store connections entry\n"));
900 conn_free(conn);
901 *pstatus = NT_STATUS_INTERNAL_DB_ERROR;
902 return NULL;
903 }
904
905 /* Preexecs are done here as they might make the dir we are to ChDir
906 * to below */
907 /* execute any "root preexec = " line */
908 if (*lp_rootpreexec(snum)) {
909 char *cmd = talloc_sub_advanced(talloc_tos(),
910 lp_servicename(SNUM(conn)),
911 conn->server_info->unix_name,
912 conn->connectpath,
913 conn->server_info->utok.gid,
914 conn->server_info->sanitized_username,
915 pdb_get_domain(conn->server_info->sam_account),
916 lp_rootpreexec(snum));
917 DEBUG(5,("cmd=%s\n",cmd));
918 ret = smbrun(cmd,NULL);
919 TALLOC_FREE(cmd);
920 if (ret != 0 && lp_rootpreexec_close(snum)) {
921 DEBUG(1,("root preexec gave %d - failing "
922 "connection\n", ret));
923 yield_connection(conn, lp_servicename(snum));
924 conn_free(conn);
925 *pstatus = NT_STATUS_ACCESS_DENIED;
926 return NULL;
927 }
928 }
929
930 /* USER Activites: */
931 if (!change_to_user(conn, conn->vuid)) {
932 /* No point continuing if they fail the basic checks */
933 DEBUG(0,("Can't become connected user!\n"));
934 yield_connection(conn, lp_servicename(snum));
935 conn_free(conn);
936 *pstatus = NT_STATUS_LOGON_FAILURE;
937 return NULL;
938 }
939
940 /* Remember that a different vuid can connect later without these
941 * checks... */
942
943 /* Preexecs are done here as they might make the dir we are to ChDir
944 * to below */
945
946 /* execute any "preexec = " line */
947 if (*lp_preexec(snum)) {
948 char *cmd = talloc_sub_advanced(talloc_tos(),
949 lp_servicename(SNUM(conn)),
950 conn->server_info->unix_name,
951 conn->connectpath,
952 conn->server_info->utok.gid,
953 conn->server_info->sanitized_username,
954 pdb_get_domain(conn->server_info->sam_account),
955 lp_preexec(snum));
956 ret = smbrun(cmd,NULL);
957 TALLOC_FREE(cmd);
958 if (ret != 0 && lp_preexec_close(snum)) {
959 DEBUG(1,("preexec gave %d - failing connection\n",
960 ret));
961 *pstatus = NT_STATUS_ACCESS_DENIED;
962 goto err_root_exit;
963 }
964 }
965
966 #ifdef WITH_FAKE_KASERVER
967 if (lp_afs_share(snum)) {
968 afs_login(conn);
969 }
970 #endif
971
972 /* Add veto/hide lists */
973 if (!IS_IPC(conn) && !IS_PRINT(conn)) {
974 set_namearray( &conn->veto_list, lp_veto_files(snum));
975 set_namearray( &conn->hide_list, lp_hide_files(snum));
976 set_namearray( &conn->veto_oplock_list, lp_veto_oplocks(snum));
977 set_namearray( &conn->aio_write_behind_list,
978 lp_aio_write_behind(snum));
979 }
980
981 /* Invoke VFS make connection hook - do this before the VFS_STAT call
982 to allow any filesystems needing user credentials to initialize
983 themselves. */
984
985 if (SMB_VFS_CONNECT(conn, lp_servicename(snum),
986 conn->server_info->unix_name) < 0) {
987 DEBUG(0,("make_connection: VFS make connection failed!\n"));
988 *pstatus = NT_STATUS_UNSUCCESSFUL;
989 goto err_root_exit;
990 }
991
992 /* Any error exit after here needs to call the disconnect hook. */
993 on_err_call_dis_hook = true;
994
995 status = create_synthetic_smb_fname(talloc_tos(), conn->connectpath,
996 NULL, NULL, &smb_fname_cpath);
997 if (!NT_STATUS_IS_OK(status)) {
998 *pstatus = status;
999 goto err_root_exit;
1000 }
1001
1002 /* win2000 does not check the permissions on the directory
1003 during the tree connect, instead relying on permission
1004 check during individual operations. To match this behaviour
1005 I have disabled this chdir check (tridge) */
1006 /* the alternative is just to check the directory exists */
1007 if ((ret = SMB_VFS_STAT(conn, smb_fname_cpath)) != 0 ||
1008 !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
1009 if (ret == 0 && !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
1010 DEBUG(0,("'%s' is not a directory, when connecting to "
1011 "[%s]\n", conn->connectpath,
1012 lp_servicename(snum)));
1013 } else {
1014 DEBUG(0,("'%s' does not exist or permission denied "
1015 "when connecting to [%s] Error was %s\n",
1016 conn->connectpath, lp_servicename(snum),
1017 strerror(errno) ));
1018 }
1019 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
1020 goto err_root_exit;
1021 }
1022
1023 string_set(&conn->origpath,conn->connectpath);
1024
1025 #if SOFTLINK_OPTIMISATION
1026 /* resolve any soft links early if possible */
1027 if (vfs_ChDir(conn,conn->connectpath) == 0) {
1028 TALLOC_CTX *ctx = talloc_tos();
1029 char *s = vfs_GetWd(ctx,s);
1030 if (!s) {
1031 *status = map_nt_error_from_unix(errno);
1032 goto err_root_exit;
1033 }
1034 if (!set_conn_connectpath(conn,s)) {
1035 *status = NT_STATUS_NO_MEMORY;
1036 goto err_root_exit;
1037 }
1038 vfs_ChDir(conn,conn->connectpath);
1039 }
1040 #endif
1041
1042 /* Figure out the characteristics of the underlying filesystem. This
1043 * assumes that all the filesystem mounted withing a share path have
1044 * the same characteristics, which is likely but not guaranteed.
1045 */
1046
1047 conn->fs_capabilities = SMB_VFS_FS_CAPABILITIES(conn, &conn->ts_res);
1048
1049 /*
1050 * Print out the 'connected as' stuff here as we need
1051 * to know the effective uid and gid we will be using
1052 * (at least initially).
1053 */
1054
1055 if( DEBUGLVL( IS_IPC(conn) ? 3 : 1 ) ) {
1056 dbgtext( "%s (%s) ", get_remote_machine_name(),
1057 conn->client_address );
1058 dbgtext( "%s", srv_is_signing_active(smbd_server_conn) ? "signed " : "");
1059 dbgtext( "connect to service %s ", lp_servicename(snum) );
1060 dbgtext( "initially as user %s ",
1061 conn->server_info->unix_name );
1062 dbgtext( "(uid=%d, gid=%d) ", (int)geteuid(), (int)getegid() );
1063 dbgtext( "(pid %d)\n", (int)sys_getpid() );
1064 }
1065
1066 /* we've finished with the user stuff - go back to root */
1067 change_to_root_user();
1068 return(conn);
1069
1070 err_root_exit:
1071 TALLOC_FREE(smb_fname_cpath);
1072 change_to_root_user();
1073 if (on_err_call_dis_hook) {
1074 /* Call VFS disconnect hook */
1075 SMB_VFS_DISCONNECT(conn);
1076 }
1077 yield_connection(conn, lp_servicename(snum));
1078 conn_free(conn);
1079 return NULL;
1080 }
1081
1082 /****************************************************************************
1083 Make a connection to a service.
1084 *
1085 * @param service
1086 ****************************************************************************/
1087
1088 connection_struct *make_connection(struct smbd_server_connection *sconn,
1089 const char *service_in, DATA_BLOB password,
1090 const char *pdev, uint16 vuid,
1091 NTSTATUS *status)
1092 {
1093 uid_t euid;
1094 user_struct *vuser = NULL;
1095 fstring service;
1096 fstring dev;
1097 int snum = -1;
1098 char addr[INET6_ADDRSTRLEN];
1099
1100 fstrcpy(dev, pdev);
1101
1102 /* This must ONLY BE CALLED AS ROOT. As it exits this function as
1103 * root. */
1104 if (!non_root_mode() && (euid = geteuid()) != 0) {
1105 DEBUG(0,("make_connection: PANIC ERROR. Called as nonroot "
1106 "(%u)\n", (unsigned int)euid ));
1107 smb_panic("make_connection: PANIC ERROR. Called as nonroot\n");
1108 }
1109
1110 if (conn_num_open(sconn) > 2047) {
1111 *status = NT_STATUS_INSUFF_SERVER_RESOURCES;
1112 return NULL;
1113 }
1114
1115 if(lp_security() != SEC_SHARE) {
1116 vuser = get_valid_user_struct(sconn, vuid);
1117 if (!vuser) {
1118 DEBUG(1,("make_connection: refusing to connect with "
1119 "no session setup\n"));
1120 *status = NT_STATUS_ACCESS_DENIED;
1121 return NULL;
1122 }
1123 }
1124
1125 /* Logic to try and connect to the correct [homes] share, preferably
1126 without too many getpwnam() lookups. This is particulary nasty for
1127 winbind usernames, where the share name isn't the same as unix
1128 username.
1129
1130 The snum of the homes share is stored on the vuser at session setup
1131 time.
1132 */
1133
1134 if (strequal(service_in,HOMES_NAME)) {
1135 if(lp_security() != SEC_SHARE) {
1136 DATA_BLOB no_pw = data_blob_null;
1137 if (vuser->homes_snum == -1) {
1138 DEBUG(2, ("[homes] share not available for "
1139 "this user because it was not found "
1140 "or created at session setup "
1141 "time\n"));
1142 *status = NT_STATUS_BAD_NETWORK_NAME;
1143 return NULL;
1144 }
1145 DEBUG(5, ("making a connection to [homes] service "
1146 "created at session setup time\n"));
1147 return make_connection_snum(sconn,
1148 vuser->homes_snum,
1149 vuser, no_pw,
1150 dev, status);
1151 } else {
1152 /* Security = share. Try with
1153 * current_user_info.smb_name as the username. */
1154 if (*current_user_info.smb_name) {
1155 fstring unix_username;
1156 fstrcpy(unix_username,
1157 current_user_info.smb_name);
1158 map_username(sconn, unix_username);
1159 snum = find_service(unix_username);
1160 }
1161 if (snum != -1) {
1162 DEBUG(5, ("making a connection to 'homes' "
1163 "service %s based on "
1164 "security=share\n", service_in));
1165 return make_connection_snum(sconn,
1166 snum, NULL,
1167 password,
1168 dev, status);
1169 }
1170 }
1171 } else if ((lp_security() != SEC_SHARE) && (vuser->homes_snum != -1)
1172 && strequal(service_in,
1173 lp_servicename(vuser->homes_snum))) {
1174 DATA_BLOB no_pw = data_blob_null;
1175 DEBUG(5, ("making a connection to 'homes' service [%s] "
1176 "created at session setup time\n", service_in));
1177 return make_connection_snum(sconn,
1178 vuser->homes_snum,
1179 vuser, no_pw,
1180 dev, status);
1181 }
1182
1183 fstrcpy(service, service_in);
1184
1185 strlower_m(service);
1186
1187 snum = find_service(service);
1188
1189 if (snum < 0) {
1190 if (strequal(service,"IPC$") ||
1191 (lp_enable_asu_support() && strequal(service,"ADMIN$"))) {
1192 DEBUG(3,("refusing IPC connection to %s\n", service));
1193 *status = NT_STATUS_ACCESS_DENIED;
1194 return NULL;
1195 }
1196
1197 DEBUG(3,("%s (%s) couldn't find service %s\n",
1198 get_remote_machine_name(),
1199 client_addr(get_client_fd(),addr,sizeof(addr)),
1200 service));
1201 *status = NT_STATUS_BAD_NETWORK_NAME;
1202 return NULL;
1203 }
1204
1205 /* Handle non-Dfs clients attempting connections to msdfs proxy */
1206 if (lp_host_msdfs() && (*lp_msdfs_proxy(snum) != '\0')) {
1207 DEBUG(3, ("refusing connection to dfs proxy share '%s' "
1208 "(pointing to %s)\n",
1209 service, lp_msdfs_proxy(snum)));
1210 *status = NT_STATUS_BAD_NETWORK_NAME;
1211 return NULL;
1212 }
1213
1214 DEBUG(5, ("making a connection to 'normal' service %s\n", service));
1215
1216 return make_connection_snum(sconn, snum, vuser,
1217 password,
1218 dev, status);
1219 }
1220
1221 /****************************************************************************
1222 Close a cnum.
1223 ****************************************************************************/
1224
1225 void close_cnum(connection_struct *conn, uint16 vuid)
1226 {
1227 file_close_conn(conn);
1228
1229 if (!IS_IPC(conn)) {
1230 dptr_closecnum(conn);
1231 }
1232
1233 change_to_root_user();
1234
1235 DEBUG(IS_IPC(conn)?3:1, ("%s (%s) closed connection to service %s\n",
1236 get_remote_machine_name(),
1237 conn->client_address,
1238 lp_servicename(SNUM(conn))));
1239
1240 /* Call VFS disconnect hook */
1241 SMB_VFS_DISCONNECT(conn);
1242
1243 yield_connection(conn, lp_servicename(SNUM(conn)));
1244
1245 /* make sure we leave the directory available for unmount */
1246 vfs_ChDir(conn, "/");
1247
1248 /* execute any "postexec = " line */
1249 if (*lp_postexec(SNUM(conn)) &&
1250 change_to_user(conn, vuid)) {
1251 char *cmd = talloc_sub_advanced(talloc_tos(),
1252 lp_servicename(SNUM(conn)),
1253 conn->server_info->unix_name,
1254 conn->connectpath,
1255 conn->server_info->utok.gid,
1256 conn->server_info->sanitized_username,
1257 pdb_get_domain(conn->server_info->sam_account),
1258 lp_postexec(SNUM(conn)));
1259 smbrun(cmd,NULL);
1260 TALLOC_FREE(cmd);
1261 change_to_root_user();
1262 }
1263
1264 change_to_root_user();
1265 /* execute any "root postexec = " line */
1266 if (*lp_rootpostexec(SNUM(conn))) {
1267 char *cmd = talloc_sub_advanced(talloc_tos(),
1268 lp_servicename(SNUM(conn)),
1269 conn->server_info->unix_name,
1270 conn->connectpath,
1271 conn->server_info->utok.gid,
1272 conn->server_info->sanitized_username,
1273 pdb_get_domain(conn->server_info->sam_account),
1274 lp_rootpostexec(SNUM(conn)));
1275 smbrun(cmd,NULL);
1276 TALLOC_FREE(cmd);
1277 }
1278
1279 conn_free(conn);
1280 }
fernandojvsilva's samba4 branch