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winreg: Use the ntstatus return code for client side errors
[Samba/gebeck_regimport.git] / source3 / smbd / service.c
blob5c410be02a68e47443d874298d8edac80bfff23f
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 #include "lib/param/loadparm.h"
31
32 extern userdom_struct current_user_info;
33
34 static bool canonicalize_connect_path(connection_struct *conn)
35 {
36 bool ret;
37 char *resolved_name = SMB_VFS_REALPATH(conn,conn->connectpath);
38 if (!resolved_name) {
39 return false;
40 }
41 ret = set_conn_connectpath(conn,resolved_name);
42 SAFE_FREE(resolved_name);
43 return ret;
44 }
45
46 /****************************************************************************
47 Ensure when setting connectpath it is a canonicalized (no ./ // or ../)
48 absolute path stating in / and not ending in /.
49 Observent people will notice a similarity between this and check_path_syntax :-).
50 ****************************************************************************/
51
52 bool set_conn_connectpath(connection_struct *conn, const char *connectpath)
53 {
54 char *destname;
55 char *d;
56 const char *s = connectpath;
57 bool start_of_name_component = true;
58
59 if (connectpath == NULL || connectpath[0] == '\0') {
60 return false;
61 }
62
63 /* Allocate for strlen + '\0' + possible leading '/' */
64 destname = (char *)SMB_MALLOC(strlen(connectpath) + 2);
65 if (!destname) {
66 return false;
67 }
68 d = destname;
69
70 *d++ = '/'; /* Always start with root. */
71
72 while (*s) {
73 if (*s == '/') {
74 /* Eat multiple '/' */
75 while (*s == '/') {
76 s++;
77 }
78 if ((d > destname + 1) && (*s != '\0')) {
79 *d++ = '/';
80 }
81 start_of_name_component = True;
82 continue;
83 }
84
85 if (start_of_name_component) {
86 if ((s[0] == '.') && (s[1] == '.') && (s[2] == '/' || s[2] == '\0')) {
87 /* Uh oh - "/../" or "/..\0" ! */
88
89 /* Go past the ../ or .. */
90 if (s[2] == '/') {
91 s += 3;
92 } else {
93 s += 2; /* Go past the .. */
94 }
95
96 /* If we just added a '/' - delete it */
97 if ((d > destname) && (*(d-1) == '/')) {
98 *(d-1) = '\0';
99 d--;
100 }
101
102 /* Are we at the start ? Can't go back further if so. */
103 if (d <= destname) {
104 *d++ = '/'; /* Can't delete root */
105 continue;
106 }
107 /* Go back one level... */
108 /* Decrement d first as d points to the *next* char to write into. */
109 for (d--; d > destname; d--) {
110 if (*d == '/') {
111 break;
112 }
113 }
114 /* We're still at the start of a name component, just the previous one. */
115 continue;
116 } else if ((s[0] == '.') && ((s[1] == '\0') || s[1] == '/')) {
117 /* Component of pathname can't be "." only - skip the '.' . */
118 if (s[1] == '/') {
119 s += 2;
120 } else {
121 s++;
122 }
123 continue;
124 }
125 }
126
127 if (!(*s & 0x80)) {
128 *d++ = *s++;
129 } else {
130 size_t siz;
131 /* Get the size of the next MB character. */
132 next_codepoint(s,&siz);
133 switch(siz) {
134 case 5:
135 *d++ = *s++;
136 /*fall through*/
137 case 4:
138 *d++ = *s++;
139 /*fall through*/
140 case 3:
141 *d++ = *s++;
142 /*fall through*/
143 case 2:
144 *d++ = *s++;
145 /*fall through*/
146 case 1:
147 *d++ = *s++;
148 break;
149 default:
150 break;
151 }
152 }
153 start_of_name_component = false;
154 }
155 *d = '\0';
156
157 /* And must not end in '/' */
158 if (d > destname + 1 && (*(d-1) == '/')) {
159 *(d-1) = '\0';
160 }
161
162 DEBUG(10,("set_conn_connectpath: service %s, connectpath = %s\n",
163 lp_servicename(SNUM(conn)), destname ));
164
165 string_set(&conn->connectpath, destname);
166 SAFE_FREE(destname);
167 return true;
168 }
169
170 /****************************************************************************
171 Load parameters specific to a connection/service.
172 ****************************************************************************/
173
174 bool set_current_service(connection_struct *conn, uint16 flags, bool do_chdir)
175 {
176 int snum;
177
178 if (!conn) {
179 last_conn = NULL;
180 return(False);
181 }
182
183 conn->lastused_count++;
184
185 snum = SNUM(conn);
186
187 if (do_chdir &&
188 vfs_ChDir(conn,conn->connectpath) != 0 &&
189 vfs_ChDir(conn,conn->origpath) != 0) {
190 DEBUG(((errno!=EACCES)?0:3),("chdir (%s) failed, reason: %s\n",
191 conn->connectpath, strerror(errno)));
192 return(False);
193 }
194
195 if ((conn == last_conn) && (last_flags == flags)) {
196 return(True);
197 }
198
199 last_conn = conn;
200 last_flags = flags;
201
202 /* Obey the client case sensitivity requests - only for clients that support it. */
203 switch (lp_casesensitive(snum)) {
204 case Auto:
205 {
206 /* We need this uglyness due to DOS/Win9x clients that lie about case insensitivity. */
207 enum remote_arch_types ra_type = get_remote_arch();
208 if ((ra_type != RA_SAMBA) && (ra_type != RA_CIFSFS)) {
209 /* Client can't support per-packet case sensitive pathnames. */
210 conn->case_sensitive = False;
211 } else {
212 conn->case_sensitive = !(flags & FLAG_CASELESS_PATHNAMES);
213 }
214 }
215 break;
216 case True:
217 conn->case_sensitive = True;
218 break;
219 default:
220 conn->case_sensitive = False;
221 break;
222 }
223 return(True);
224 }
225
226 /****************************************************************************
227 do some basic sainity checks on the share.
228 This function modifies dev, ecode.
229 ****************************************************************************/
230
231 static NTSTATUS share_sanity_checks(const struct tsocket_address *remote_address,
232 const char *rhost,
233 int snum,
234 fstring dev)
235 {
236 char *raddr;
237
238 raddr = tsocket_address_inet_addr_string(remote_address,
239 talloc_tos());
240 if (raddr == NULL) {
241 return NT_STATUS_NO_MEMORY;
242 }
243
244 if (!lp_snum_ok(snum) ||
245 !allow_access(lp_hostsdeny(snum), lp_hostsallow(snum),
246 rhost, raddr)) {
247 return NT_STATUS_ACCESS_DENIED;
248 }
249
250 if (dev[0] == '?' || !dev[0]) {
251 if (lp_print_ok(snum)) {
252 fstrcpy(dev,"LPT1:");
253 } else if (strequal(lp_fstype(snum), "IPC")) {
254 fstrcpy(dev, "IPC");
255 } else {
256 fstrcpy(dev,"A:");
257 }
258 }
259
260 strupper_m(dev);
261
262 if (lp_print_ok(snum)) {
263 if (!strequal(dev, "LPT1:")) {
264 return NT_STATUS_BAD_DEVICE_TYPE;
265 }
266 } else if (strequal(lp_fstype(snum), "IPC")) {
267 if (!strequal(dev, "IPC")) {
268 return NT_STATUS_BAD_DEVICE_TYPE;
269 }
270 } else if (!strequal(dev, "A:")) {
271 return NT_STATUS_BAD_DEVICE_TYPE;
272 }
273
274 /* Behave as a printer if we are supposed to */
275 if (lp_print_ok(snum) && (strcmp(dev, "A:") == 0)) {
276 fstrcpy(dev, "LPT1:");
277 }
278
279 return NT_STATUS_OK;
280 }
281
282 /*
283 * Go through lookup_name etc to find the force'd group.
284 *
285 * Create a new token from src_token, replacing the primary group sid with the
286 * one found.
287 */
288
289 static NTSTATUS find_forced_group(bool force_user,
290 int snum, const char *username,
291 struct dom_sid *pgroup_sid,
292 gid_t *pgid)
293 {
294 NTSTATUS result = NT_STATUS_NO_SUCH_GROUP;
295 TALLOC_CTX *frame = talloc_stackframe();
296 struct dom_sid group_sid;
297 enum lsa_SidType type;
298 char *groupname;
299 bool user_must_be_member = False;
300 gid_t gid;
301
302 groupname = talloc_strdup(talloc_tos(), lp_force_group(snum));
303 if (groupname == NULL) {
304 DEBUG(1, ("talloc_strdup failed\n"));
305 result = NT_STATUS_NO_MEMORY;
306 goto done;
307 }
308
309 if (groupname[0] == '+') {
310 user_must_be_member = True;
311 groupname += 1;
312 }
313
314 groupname = talloc_string_sub(talloc_tos(), groupname,
315 "%S", lp_servicename(snum));
316 if (groupname == NULL) {
317 DEBUG(1, ("talloc_string_sub failed\n"));
318 result = NT_STATUS_NO_MEMORY;
319 goto done;
320 }
321
322 if (!lookup_name_smbconf(talloc_tos(), groupname,
323 LOOKUP_NAME_ALL|LOOKUP_NAME_GROUP,
324 NULL, NULL, &group_sid, &type)) {
325 DEBUG(10, ("lookup_name_smbconf(%s) failed\n",
326 groupname));
327 goto done;
328 }
329
330 if ((type != SID_NAME_DOM_GRP) && (type != SID_NAME_ALIAS) &&
331 (type != SID_NAME_WKN_GRP)) {
332 DEBUG(10, ("%s is a %s, not a group\n", groupname,
333 sid_type_lookup(type)));
334 goto done;
335 }
336
337 if (!sid_to_gid(&group_sid, &gid)) {
338 DEBUG(10, ("sid_to_gid(%s) for %s failed\n",
339 sid_string_dbg(&group_sid), groupname));
340 goto done;
341 }
342
343 /*
344 * If the user has been forced and the forced group starts with a '+',
345 * then we only set the group to be the forced group if the forced
346 * user is a member of that group. Otherwise, the meaning of the '+'
347 * would be ignored.
348 */
349
350 if (force_user && user_must_be_member) {
351 if (user_in_group_sid(username, &group_sid)) {
352 sid_copy(pgroup_sid, &group_sid);
353 *pgid = gid;
354 DEBUG(3,("Forced group %s for member %s\n",
355 groupname, username));
356 } else {
357 DEBUG(0,("find_forced_group: forced user %s is not a member "
358 "of forced group %s. Disallowing access.\n",
359 username, groupname ));
360 result = NT_STATUS_MEMBER_NOT_IN_GROUP;
361 goto done;
362 }
363 } else {
364 sid_copy(pgroup_sid, &group_sid);
365 *pgid = gid;
366 DEBUG(3,("Forced group %s\n", groupname));
367 }
368
369 result = NT_STATUS_OK;
370 done:
371 TALLOC_FREE(frame);
372 return result;
373 }
374
375 /****************************************************************************
376 Create an auth_serversupplied_info structure for a connection_struct
377 ****************************************************************************/
378
379 static NTSTATUS create_connection_session_info(struct smbd_server_connection *sconn,
380 TALLOC_CTX *mem_ctx, int snum,
381 struct auth_serversupplied_info *vuid_serverinfo,
382 DATA_BLOB password,
383 struct auth_serversupplied_info **presult)
384 {
385 if (lp_guest_only(snum)) {
386 return make_server_info_guest(mem_ctx, presult);
387 }
388
389 if (vuid_serverinfo != NULL) {
390
391 struct auth_serversupplied_info *result;
392
393 /*
394 * This is the normal security != share case where we have a
395 * valid vuid from the session setup. */
396
397 if (vuid_serverinfo->guest) {
398 if (!lp_guest_ok(snum)) {
399 DEBUG(2, ("guest user (from session setup) "
400 "not permitted to access this share "
401 "(%s)\n", lp_servicename(snum)));
402 return NT_STATUS_ACCESS_DENIED;
403 }
404 } else {
405 if (!user_ok_token(vuid_serverinfo->unix_name,
406 vuid_serverinfo->info3->base.domain.string,
407 vuid_serverinfo->security_token, snum)) {
408 DEBUG(2, ("user '%s' (from session setup) not "
409 "permitted to access this share "
410 "(%s)\n",
411 vuid_serverinfo->unix_name,
412 lp_servicename(snum)));
413 return NT_STATUS_ACCESS_DENIED;
414 }
415 }
416
417 result = copy_serverinfo(mem_ctx, vuid_serverinfo);
418 if (result == NULL) {
419 return NT_STATUS_NO_MEMORY;
420 }
421
422 *presult = result;
423 return NT_STATUS_OK;
424 }
425
426 if (lp_security() == SEC_SHARE) {
427
428 fstring user;
429 bool guest;
430
431 /* add the sharename as a possible user name if we
432 are in share mode security */
433
434 add_session_user(sconn, lp_servicename(snum));
435
436 /* shall we let them in? */
437
438 if (!authorise_login(sconn, snum,user,password,&guest)) {
439 DEBUG( 2, ( "Invalid username/password for [%s]\n",
440 lp_servicename(snum)) );
441 return NT_STATUS_WRONG_PASSWORD;
442 }
443
444 return make_session_info_from_username(mem_ctx, user, guest,
445 presult);
446 }
447
448 DEBUG(0, ("invalid VUID (vuser) but not in security=share\n"));
449 return NT_STATUS_ACCESS_DENIED;
450 }
451
452 /****************************************************************************
453 set relavent user and group settings corresponding to force user/group
454 configuration for the given snum.
455 ****************************************************************************/
456
457 NTSTATUS set_conn_force_user_group(connection_struct *conn, int snum)
458 {
459 NTSTATUS status;
460
461 if (*lp_force_user(snum)) {
462
463 /*
464 * Replace conn->session_info with a completely faked up one
465 * from the username we are forced into :-)
466 */
467
468 char *fuser;
469 struct auth_serversupplied_info *forced_serverinfo;
470
471 fuser = talloc_string_sub(conn, lp_force_user(snum), "%S",
472 lp_const_servicename(snum));
473 if (fuser == NULL) {
474 return NT_STATUS_NO_MEMORY;
475 }
476
477 status = make_session_info_from_username(
478 conn, fuser, conn->session_info->guest,
479 &forced_serverinfo);
480 if (!NT_STATUS_IS_OK(status)) {
481 return status;
482 }
483
484 TALLOC_FREE(conn->session_info);
485 conn->session_info = forced_serverinfo;
486
487 conn->force_user = true;
488 DEBUG(3,("Forced user %s\n", fuser));
489 }
490
491 /*
492 * If force group is true, then override
493 * any groupid stored for the connecting user.
494 */
495
496 if (*lp_force_group(snum)) {
497
498 status = find_forced_group(
499 conn->force_user, snum, conn->session_info->unix_name,
500 &conn->session_info->security_token->sids[1],
501 &conn->session_info->utok.gid);
502
503 if (!NT_STATUS_IS_OK(status)) {
504 return status;
505 }
506
507 /*
508 * We need to cache this gid, to use within
509 * change_to_user() separately from the conn->session_info
510 * struct. We only use conn->session_info directly if
511 * "force_user" was set.
512 */
513 conn->force_group_gid = conn->session_info->utok.gid;
514 }
515
516 return NT_STATUS_OK;
517 }
518
519 /****************************************************************************
520 Make a connection, given the snum to connect to, and the vuser of the
521 connecting user if appropriate.
522 ****************************************************************************/
523
524 connection_struct *make_connection_snum(struct smbd_server_connection *sconn,
525 int snum, user_struct *vuser,
526 DATA_BLOB password,
527 const char *pdev,
528 NTSTATUS *pstatus)
529 {
530 connection_struct *conn = NULL;
531 struct smb_filename *smb_fname_cpath = NULL;
532 fstring dev;
533 int ret;
534 bool on_err_call_dis_hook = false;
535 bool claimed_connection = false;
536 uid_t effuid;
537 gid_t effgid;
538 NTSTATUS status;
539
540 fstrcpy(dev, pdev);
541
542 *pstatus = share_sanity_checks(sconn->remote_address,
543 sconn->remote_hostname,
544 snum,
545 dev);
546 if (NT_STATUS_IS_ERR(*pstatus)) {
547 goto err_root_exit;
548 }
549
550 conn = conn_new(sconn);
551 if (!conn) {
552 DEBUG(0,("Couldn't find free connection.\n"));
553 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
554 goto err_root_exit;
555 }
556
557 conn->params->service = snum;
558
559 status = create_connection_session_info(sconn,
560 conn, snum, vuser ? vuser->session_info : NULL, password,
561 &conn->session_info);
562
563 if (!NT_STATUS_IS_OK(status)) {
564 DEBUG(1, ("create_connection_session_info failed: %s\n",
565 nt_errstr(status)));
566 *pstatus = status;
567 goto err_root_exit;
568 }
569
570 if ((lp_guest_only(snum)) || (lp_security() == SEC_SHARE)) {
571 conn->force_user = true;
572 }
573
574 add_session_user(sconn, conn->session_info->unix_name);
575
576 conn->num_files_open = 0;
577 conn->lastused = conn->lastused_count = time(NULL);
578 conn->used = True;
579 conn->printer = (strncmp(dev,"LPT",3) == 0);
580 conn->ipc = ( (strncmp(dev,"IPC",3) == 0) ||
581 ( lp_enable_asu_support() && strequal(dev,"ADMIN$")) );
582
583 /* Case options for the share. */
584 if (lp_casesensitive(snum) == Auto) {
585 /* We will be setting this per packet. Set to be case
586 * insensitive for now. */
587 conn->case_sensitive = False;
588 } else {
589 conn->case_sensitive = (bool)lp_casesensitive(snum);
590 }
591
592 conn->case_preserve = lp_preservecase(snum);
593 conn->short_case_preserve = lp_shortpreservecase(snum);
594
595 conn->encrypt_level = lp_smb_encrypt(snum);
596
597 conn->veto_list = NULL;
598 conn->hide_list = NULL;
599 conn->veto_oplock_list = NULL;
600 conn->aio_write_behind_list = NULL;
601
602 conn->read_only = lp_readonly(SNUM(conn));
603
604 status = set_conn_force_user_group(conn, snum);
605 if (!NT_STATUS_IS_OK(status)) {
606 conn_free(conn);
607 *pstatus = status;
608 return NULL;
609 }
610
611 conn->vuid = (vuser != NULL) ? vuser->vuid : UID_FIELD_INVALID;
612
613 {
614 char *s = talloc_sub_advanced(talloc_tos(),
615 lp_servicename(SNUM(conn)),
616 conn->session_info->unix_name,
617 conn->connectpath,
618 conn->session_info->utok.gid,
619 conn->session_info->sanitized_username,
620 conn->session_info->info3->base.domain.string,
621 lp_pathname(snum));
622 if (!s) {
623 *pstatus = NT_STATUS_NO_MEMORY;
624 goto err_root_exit;
625 }
626
627 if (!set_conn_connectpath(conn,s)) {
628 TALLOC_FREE(s);
629 *pstatus = NT_STATUS_NO_MEMORY;
630 goto err_root_exit;
631 }
632 DEBUG(3,("Connect path is '%s' for service [%s]\n",s,
633 lp_servicename(snum)));
634 TALLOC_FREE(s);
635 }
636
637 /*
638 * New code to check if there's a share security descripter
639 * added from NT server manager. This is done after the
640 * smb.conf checks are done as we need a uid and token. JRA.
641 *
642 */
643
644 share_access_check(conn->session_info->security_token,
645 lp_servicename(snum), MAXIMUM_ALLOWED_ACCESS,
646 &conn->share_access);
647
648 if ((conn->share_access & FILE_WRITE_DATA) == 0) {
649 if ((conn->share_access & FILE_READ_DATA) == 0) {
650 /* No access, read or write. */
651 DEBUG(0,("make_connection: connection to %s "
652 "denied due to security "
653 "descriptor.\n",
654 lp_servicename(snum)));
655 *pstatus = NT_STATUS_ACCESS_DENIED;
656 goto err_root_exit;
657 } else {
658 conn->read_only = True;
659 }
660 }
661 /* Initialise VFS function pointers */
662
663 if (!smbd_vfs_init(conn)) {
664 DEBUG(0, ("vfs_init failed for service %s\n",
665 lp_servicename(snum)));
666 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
667 goto err_root_exit;
668 }
669
670 /* ROOT Activities: */
671 /* explicitly check widelinks here so that we can correctly warn
672 * in the logs. */
673 widelinks_warning(snum);
674
675 /*
676 * Enforce the max connections parameter.
677 */
678
679 if ((lp_max_connections(snum) > 0)
680 && (count_current_connections(lp_servicename(SNUM(conn)), True) >=
681 lp_max_connections(snum))) {
682
683 DEBUG(1, ("Max connections (%d) exceeded for %s\n",
684 lp_max_connections(snum), lp_servicename(snum)));
685 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
686 goto err_root_exit;
687 }
688
689 /*
690 * Get us an entry in the connections db
691 */
692 if (!claim_connection(conn, lp_servicename(snum))) {
693 DEBUG(1, ("Could not store connections entry\n"));
694 *pstatus = NT_STATUS_INTERNAL_DB_ERROR;
695 goto err_root_exit;
696 }
697 claimed_connection = true;
698
699 /* Invoke VFS make connection hook - this must be the first
700 filesystem operation that we do. */
701
702 if (SMB_VFS_CONNECT(conn, lp_servicename(snum),
703 conn->session_info->unix_name) < 0) {
704 DEBUG(0,("make_connection: VFS make connection failed!\n"));
705 *pstatus = NT_STATUS_UNSUCCESSFUL;
706 goto err_root_exit;
707 }
708
709 /* Any error exit after here needs to call the disconnect hook. */
710 on_err_call_dis_hook = true;
711
712 if ((!conn->printer) && (!conn->ipc)) {
713 conn->notify_ctx = notify_init(conn,
714 sconn_server_id(sconn),
715 sconn->msg_ctx,
716 server_event_context(),
717 conn);
718 }
719
720 /*
721 * Fix compatibility issue pointed out by Volker.
722 * We pass the conn->connectpath to the preexec
723 * scripts as a parameter, so attempt to canonicalize
724 * it here before calling the preexec scripts.
725 * We ignore errors here, as it is possible that
726 * the conn->connectpath doesn't exist yet and
727 * the preexec scripts will create them.
728 */
729
730 (void)canonicalize_connect_path(conn);
731
732 /* Preexecs are done here as they might make the dir we are to ChDir
733 * to below */
734 /* execute any "root preexec = " line */
735 if (*lp_rootpreexec(snum)) {
736 char *cmd = talloc_sub_advanced(talloc_tos(),
737 lp_servicename(SNUM(conn)),
738 conn->session_info->unix_name,
739 conn->connectpath,
740 conn->session_info->utok.gid,
741 conn->session_info->sanitized_username,
742 conn->session_info->info3->base.domain.string,
743 lp_rootpreexec(snum));
744 DEBUG(5,("cmd=%s\n",cmd));
745 ret = smbrun(cmd,NULL);
746 TALLOC_FREE(cmd);
747 if (ret != 0 && lp_rootpreexec_close(snum)) {
748 DEBUG(1,("root preexec gave %d - failing "
749 "connection\n", ret));
750 *pstatus = NT_STATUS_ACCESS_DENIED;
751 goto err_root_exit;
752 }
753 }
754
755 /* USER Activites: */
756 if (!change_to_user(conn, conn->vuid)) {
757 /* No point continuing if they fail the basic checks */
758 DEBUG(0,("Can't become connected user!\n"));
759 *pstatus = NT_STATUS_LOGON_FAILURE;
760 goto err_root_exit;
761 }
762
763 effuid = geteuid();
764 effgid = getegid();
765
766 /* Remember that a different vuid can connect later without these
767 * checks... */
768
769 /* Preexecs are done here as they might make the dir we are to ChDir
770 * to below */
771
772 /* execute any "preexec = " line */
773 if (*lp_preexec(snum)) {
774 char *cmd = talloc_sub_advanced(talloc_tos(),
775 lp_servicename(SNUM(conn)),
776 conn->session_info->unix_name,
777 conn->connectpath,
778 conn->session_info->utok.gid,
779 conn->session_info->sanitized_username,
780 conn->session_info->info3->base.domain.string,
781 lp_preexec(snum));
782 ret = smbrun(cmd,NULL);
783 TALLOC_FREE(cmd);
784 if (ret != 0 && lp_preexec_close(snum)) {
785 DEBUG(1,("preexec gave %d - failing connection\n",
786 ret));
787 *pstatus = NT_STATUS_ACCESS_DENIED;
788 goto err_root_exit;
789 }
790 }
791
792 #ifdef WITH_FAKE_KASERVER
793 if (lp_afs_share(snum)) {
794 afs_login(conn);
795 }
796 #endif
797
798 /*
799 * we've finished with the user stuff - go back to root
800 * so the SMB_VFS_STAT call will only fail on path errors,
801 * not permission problems.
802 */
803 change_to_root_user();
804 /* ROOT Activites: */
805
806 /*
807 * If widelinks are disallowed we need to canonicalise the connect
808 * path here to ensure we don't have any symlinks in the
809 * connectpath. We will be checking all paths on this connection are
810 * below this directory. We must do this after the VFS init as we
811 * depend on the realpath() pointer in the vfs table. JRA.
812 */
813 if (!lp_widelinks(snum)) {
814 if (!canonicalize_connect_path(conn)) {
815 DEBUG(0, ("canonicalize_connect_path failed "
816 "for service %s, path %s\n",
817 lp_servicename(snum),
818 conn->connectpath));
819 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
820 goto err_root_exit;
821 }
822 }
823
824 /* Add veto/hide lists */
825 if (!IS_IPC(conn) && !IS_PRINT(conn)) {
826 set_namearray( &conn->veto_list, lp_veto_files(snum));
827 set_namearray( &conn->hide_list, lp_hide_files(snum));
828 set_namearray( &conn->veto_oplock_list, lp_veto_oplocks(snum));
829 set_namearray( &conn->aio_write_behind_list,
830 lp_aio_write_behind(snum));
831 }
832 status = create_synthetic_smb_fname(talloc_tos(), conn->connectpath,
833 NULL, NULL, &smb_fname_cpath);
834 if (!NT_STATUS_IS_OK(status)) {
835 *pstatus = status;
836 goto err_root_exit;
837 }
838
839 /* win2000 does not check the permissions on the directory
840 during the tree connect, instead relying on permission
841 check during individual operations. To match this behaviour
842 I have disabled this chdir check (tridge) */
843 /* the alternative is just to check the directory exists */
844
845 if ((ret = SMB_VFS_STAT(conn, smb_fname_cpath)) != 0 ||
846 !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
847 if (ret == 0 && !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
848 DEBUG(0,("'%s' is not a directory, when connecting to "
849 "[%s]\n", conn->connectpath,
850 lp_servicename(snum)));
851 } else {
852 DEBUG(0,("'%s' does not exist or permission denied "
853 "when connecting to [%s] Error was %s\n",
854 conn->connectpath, lp_servicename(snum),
855 strerror(errno) ));
856 }
857 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
858 goto err_root_exit;
859 }
860 conn->base_share_dev = smb_fname_cpath->st.st_ex_dev;
861
862 string_set(&conn->origpath,conn->connectpath);
863
864 /* Figure out the characteristics of the underlying filesystem. This
865 * assumes that all the filesystem mounted withing a share path have
866 * the same characteristics, which is likely but not guaranteed.
867 */
868
869 conn->fs_capabilities = SMB_VFS_FS_CAPABILITIES(conn, &conn->ts_res);
870
871 /*
872 * Print out the 'connected as' stuff here as we need
873 * to know the effective uid and gid we will be using
874 * (at least initially).
875 */
876
877 if( DEBUGLVL( IS_IPC(conn) ? 3 : 1 ) ) {
878 dbgtext( "%s (%s) ", get_remote_machine_name(),
879 tsocket_address_string(conn->sconn->remote_address,
880 talloc_tos()) );
881 dbgtext( "%s", srv_is_signing_active(sconn) ? "signed " : "");
882 dbgtext( "connect to service %s ", lp_servicename(snum) );
883 dbgtext( "initially as user %s ",
884 conn->session_info->unix_name );
885 dbgtext( "(uid=%d, gid=%d) ", (int)effuid, (int)effgid );
886 dbgtext( "(pid %d)\n", (int)sys_getpid() );
887 }
888
889 return(conn);
890
891 err_root_exit:
892 TALLOC_FREE(smb_fname_cpath);
893 /* We must exit this function as root. */
894 if (geteuid() != 0) {
895 change_to_root_user();
896 }
897 if (on_err_call_dis_hook) {
898 /* Call VFS disconnect hook */
899 SMB_VFS_DISCONNECT(conn);
900 }
901 if (claimed_connection) {
902 yield_connection(conn, lp_servicename(snum));
903 }
904 if (conn) {
905 conn_free(conn);
906 }
907 return NULL;
908 }
909
910 /****************************************************************************
911 Make a connection to a service.
912 *
913 * @param service
914 ****************************************************************************/
915
916 connection_struct *make_connection(struct smbd_server_connection *sconn,
917 const char *service_in, DATA_BLOB password,
918 const char *pdev, uint16 vuid,
919 NTSTATUS *status)
920 {
921 uid_t euid;
922 user_struct *vuser = NULL;
923 char *service = NULL;
924 fstring dev;
925 int snum = -1;
926
927 fstrcpy(dev, pdev);
928
929 /* This must ONLY BE CALLED AS ROOT. As it exits this function as
930 * root. */
931 if (!non_root_mode() && (euid = geteuid()) != 0) {
932 DEBUG(0,("make_connection: PANIC ERROR. Called as nonroot "
933 "(%u)\n", (unsigned int)euid ));
934 smb_panic("make_connection: PANIC ERROR. Called as nonroot\n");
935 }
936
937 if (conn_num_open(sconn) > 2047) {
938 *status = NT_STATUS_INSUFF_SERVER_RESOURCES;
939 return NULL;
940 }
941
942 if(lp_security() != SEC_SHARE) {
943 vuser = get_valid_user_struct(sconn, vuid);
944 if (!vuser) {
945 DEBUG(1,("make_connection: refusing to connect with "
946 "no session setup\n"));
947 *status = NT_STATUS_ACCESS_DENIED;
948 return NULL;
949 }
950 }
951
952 /* Logic to try and connect to the correct [homes] share, preferably
953 without too many getpwnam() lookups. This is particulary nasty for
954 winbind usernames, where the share name isn't the same as unix
955 username.
956
957 The snum of the homes share is stored on the vuser at session setup
958 time.
959 */
960
961 if (strequal(service_in,HOMES_NAME)) {
962 if(lp_security() != SEC_SHARE) {
963 DATA_BLOB no_pw = data_blob_null;
964 if (vuser->homes_snum == -1) {
965 DEBUG(2, ("[homes] share not available for "
966 "this user because it was not found "
967 "or created at session setup "
968 "time\n"));
969 *status = NT_STATUS_BAD_NETWORK_NAME;
970 return NULL;
971 }
972 DEBUG(5, ("making a connection to [homes] service "
973 "created at session setup time\n"));
974 return make_connection_snum(sconn,
975 vuser->homes_snum,
976 vuser, no_pw,
977 dev, status);
978 } else {
979 /* Security = share. Try with
980 * current_user_info.smb_name as the username. */
981 if (*current_user_info.smb_name) {
982 char *unix_username = NULL;
983 (void)map_username(talloc_tos(),
984 current_user_info.smb_name,
985 &unix_username);
986 snum = find_service(talloc_tos(),
987 unix_username,
988 &unix_username);
989 if (!unix_username) {
990 *status = NT_STATUS_NO_MEMORY;
991 }
992 return NULL;
993 }
994 if (snum != -1) {
995 DEBUG(5, ("making a connection to 'homes' "
996 "service %s based on "
997 "security=share\n", service_in));
998 return make_connection_snum(sconn,
999 snum, NULL,
1000 password,
1001 dev, status);
1002 }
1003 }
1004 } else if ((lp_security() != SEC_SHARE) && (vuser->homes_snum != -1)
1005 && strequal(service_in,
1006 lp_servicename(vuser->homes_snum))) {
1007 DATA_BLOB no_pw = data_blob_null;
1008 DEBUG(5, ("making a connection to 'homes' service [%s] "
1009 "created at session setup time\n", service_in));
1010 return make_connection_snum(sconn,
1011 vuser->homes_snum,
1012 vuser, no_pw,
1013 dev, status);
1014 }
1015
1016 service = talloc_strdup(talloc_tos(), service_in);
1017 if (!service) {
1018 *status = NT_STATUS_NO_MEMORY;
1019 return NULL;
1020 }
1021
1022 strlower_m(service);
1023
1024 snum = find_service(talloc_tos(), service, &service);
1025 if (!service) {
1026 *status = NT_STATUS_NO_MEMORY;
1027 return NULL;
1028 }
1029
1030 if (snum < 0) {
1031 if (strequal(service,"IPC$") ||
1032 (lp_enable_asu_support() && strequal(service,"ADMIN$"))) {
1033 DEBUG(3,("refusing IPC connection to %s\n", service));
1034 *status = NT_STATUS_ACCESS_DENIED;
1035 return NULL;
1036 }
1037
1038 DEBUG(3,("%s (%s) couldn't find service %s\n",
1039 get_remote_machine_name(),
1040 tsocket_address_string(
1041 sconn->remote_address, talloc_tos()),
1042 service));
1043 *status = NT_STATUS_BAD_NETWORK_NAME;
1044 return NULL;
1045 }
1046
1047 /* Handle non-Dfs clients attempting connections to msdfs proxy */
1048 if (lp_host_msdfs() && (*lp_msdfs_proxy(snum) != '\0')) {
1049 DEBUG(3, ("refusing connection to dfs proxy share '%s' "
1050 "(pointing to %s)\n",
1051 service, lp_msdfs_proxy(snum)));
1052 *status = NT_STATUS_BAD_NETWORK_NAME;
1053 return NULL;
1054 }
1055
1056 DEBUG(5, ("making a connection to 'normal' service %s\n", service));
1057
1058 return make_connection_snum(sconn, snum, vuser,
1059 password,
1060 dev, status);
1061 }
1062
1063 /****************************************************************************
1064 Close a cnum.
1065 ****************************************************************************/
1066
1067 void close_cnum(connection_struct *conn, uint16 vuid)
1068 {
1069 file_close_conn(conn);
1070
1071 if (!IS_IPC(conn)) {
1072 dptr_closecnum(conn);
1073 }
1074
1075 change_to_root_user();
1076
1077 DEBUG(IS_IPC(conn)?3:1, ("%s (%s) closed connection to service %s\n",
1078 get_remote_machine_name(),
1079 tsocket_address_string(conn->sconn->remote_address,
1080 talloc_tos()),
1081 lp_servicename(SNUM(conn))));
1082
1083 /* Call VFS disconnect hook */
1084 SMB_VFS_DISCONNECT(conn);
1085
1086 yield_connection(conn, lp_servicename(SNUM(conn)));
1087
1088 /* make sure we leave the directory available for unmount */
1089 vfs_ChDir(conn, "/");
1090
1091 /* execute any "postexec = " line */
1092 if (*lp_postexec(SNUM(conn)) &&
1093 change_to_user(conn, vuid)) {
1094 char *cmd = talloc_sub_advanced(talloc_tos(),
1095 lp_servicename(SNUM(conn)),
1096 conn->session_info->unix_name,
1097 conn->connectpath,
1098 conn->session_info->utok.gid,
1099 conn->session_info->sanitized_username,
1100 conn->session_info->info3->base.domain.string,
1101 lp_postexec(SNUM(conn)));
1102 smbrun(cmd,NULL);
1103 TALLOC_FREE(cmd);
1104 change_to_root_user();
1105 }
1106
1107 change_to_root_user();
1108 /* execute any "root postexec = " line */
1109 if (*lp_rootpostexec(SNUM(conn))) {
1110 char *cmd = talloc_sub_advanced(talloc_tos(),
1111 lp_servicename(SNUM(conn)),
1112 conn->session_info->unix_name,
1113 conn->connectpath,
1114 conn->session_info->utok.gid,
1115 conn->session_info->sanitized_username,
1116 conn->session_info->info3->base.domain.string,
1117 lp_rootpostexec(SNUM(conn)));
1118 smbrun(cmd,NULL);
1119 TALLOC_FREE(cmd);
1120 }
1121
1122 conn_free(conn);
1123 }
reg import