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Change API for create_share_access_mask() to pass in the token.
[Samba.git] / source3 / smbd / service.c
blob3e1d87f1f00c4678d17f339a980c53b6f4d77efb
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 "system/passwd.h" /* uid_wrapper */
23 #include "../lib/tsocket/tsocket.h"
24 #include "smbd/smbd.h"
25 #include "smbd/globals.h"
26 #include "../librpc/gen_ndr/netlogon.h"
27 #include "../libcli/security/security.h"
28 #include "printing/pcap.h"
29 #include "passdb/lookup_sid.h"
30 #include "auth.h"
31 #include "lib/param/loadparm.h"
32 #include "messages.h"
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 *)talloc_size(conn, 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(talloc_tos(), SNUM(conn)), destname ));
164
165 talloc_free(conn->connectpath);
166 conn->connectpath = destname;
167 /* Ensure conn->cwd is initialized - start as conn->connectpath. */
168 TALLOC_FREE(conn->cwd);
169 conn->cwd = talloc_strdup(conn, conn->connectpath);
170 if (!conn->cwd) {
171 return false;
172 }
173 return true;
174 }
175
176 /****************************************************************************
177 Load parameters specific to a connection/service.
178 ****************************************************************************/
179
180 bool set_current_service(connection_struct *conn, uint16 flags, bool do_chdir)
181 {
182 int snum;
183
184 if (!conn) {
185 last_conn = NULL;
186 return(False);
187 }
188
189 conn->lastused_count++;
190
191 snum = SNUM(conn);
192
193 if (do_chdir &&
194 vfs_ChDir(conn,conn->connectpath) != 0 &&
195 vfs_ChDir(conn,conn->origpath) != 0) {
196 DEBUG(((errno!=EACCES)?0:3),("chdir (%s) failed, reason: %s\n",
197 conn->connectpath, strerror(errno)));
198 return(False);
199 }
200
201 if ((conn == last_conn) && (last_flags == flags)) {
202 return(True);
203 }
204
205 last_conn = conn;
206 last_flags = flags;
207
208 /* Obey the client case sensitivity requests - only for clients that support it. */
209 switch (lp_casesensitive(snum)) {
210 case Auto:
211 {
212 /* We need this uglyness due to DOS/Win9x clients that lie about case insensitivity. */
213 enum remote_arch_types ra_type = get_remote_arch();
214 if ((ra_type != RA_SAMBA) && (ra_type != RA_CIFSFS)) {
215 /* Client can't support per-packet case sensitive pathnames. */
216 conn->case_sensitive = False;
217 } else {
218 conn->case_sensitive = !(flags & FLAG_CASELESS_PATHNAMES);
219 }
220 }
221 break;
222 case True:
223 conn->case_sensitive = True;
224 break;
225 default:
226 conn->case_sensitive = False;
227 break;
228 }
229 return(True);
230 }
231
232 /****************************************************************************
233 do some basic sainity checks on the share.
234 This function modifies dev, ecode.
235 ****************************************************************************/
236
237 static NTSTATUS share_sanity_checks(const struct tsocket_address *remote_address,
238 const char *rhost,
239 int snum,
240 fstring dev)
241 {
242 char *raddr;
243
244 raddr = tsocket_address_inet_addr_string(remote_address,
245 talloc_tos());
246 if (raddr == NULL) {
247 return NT_STATUS_NO_MEMORY;
248 }
249
250 if (!lp_snum_ok(snum) ||
251 !allow_access(lp_hostsdeny(snum), lp_hostsallow(snum),
252 rhost, raddr)) {
253 return NT_STATUS_ACCESS_DENIED;
254 }
255
256 if (dev[0] == '?' || !dev[0]) {
257 if (lp_print_ok(snum)) {
258 fstrcpy(dev,"LPT1:");
259 } else if (strequal(lp_fstype(talloc_tos(), snum), "IPC")) {
260 fstrcpy(dev, "IPC");
261 } else {
262 fstrcpy(dev,"A:");
263 }
264 }
265
266 if (!strupper_m(dev)) {
267 DEBUG(2,("strupper_m %s failed\n", dev));
268 return NT_STATUS_INVALID_PARAMETER;
269 }
270
271 if (lp_print_ok(snum)) {
272 if (!strequal(dev, "LPT1:")) {
273 return NT_STATUS_BAD_DEVICE_TYPE;
274 }
275 } else if (strequal(lp_fstype(talloc_tos(), snum), "IPC")) {
276 if (!strequal(dev, "IPC")) {
277 return NT_STATUS_BAD_DEVICE_TYPE;
278 }
279 } else if (!strequal(dev, "A:")) {
280 return NT_STATUS_BAD_DEVICE_TYPE;
281 }
282
283 /* Behave as a printer if we are supposed to */
284 if (lp_print_ok(snum) && (strcmp(dev, "A:") == 0)) {
285 fstrcpy(dev, "LPT1:");
286 }
287
288 return NT_STATUS_OK;
289 }
290
291 /*
292 * Go through lookup_name etc to find the force'd group.
293 *
294 * Create a new token from src_token, replacing the primary group sid with the
295 * one found.
296 */
297
298 static NTSTATUS find_forced_group(bool force_user,
299 int snum, const char *username,
300 struct dom_sid *pgroup_sid,
301 gid_t *pgid)
302 {
303 NTSTATUS result = NT_STATUS_NO_SUCH_GROUP;
304 TALLOC_CTX *frame = talloc_stackframe();
305 struct dom_sid group_sid;
306 enum lsa_SidType type;
307 char *groupname;
308 bool user_must_be_member = False;
309 gid_t gid;
310
311 groupname = lp_force_group(talloc_tos(), snum);
312 if (groupname == NULL) {
313 DEBUG(1, ("talloc_strdup failed\n"));
314 result = NT_STATUS_NO_MEMORY;
315 goto done;
316 }
317
318 if (groupname[0] == '+') {
319 user_must_be_member = True;
320 groupname += 1;
321 }
322
323 groupname = talloc_string_sub(talloc_tos(), groupname,
324 "%S", lp_servicename(talloc_tos(), snum));
325 if (groupname == NULL) {
326 DEBUG(1, ("talloc_string_sub failed\n"));
327 result = NT_STATUS_NO_MEMORY;
328 goto done;
329 }
330
331 if (!lookup_name_smbconf(talloc_tos(), groupname,
332 LOOKUP_NAME_ALL|LOOKUP_NAME_GROUP,
333 NULL, NULL, &group_sid, &type)) {
334 DEBUG(10, ("lookup_name_smbconf(%s) failed\n",
335 groupname));
336 goto done;
337 }
338
339 if ((type != SID_NAME_DOM_GRP) && (type != SID_NAME_ALIAS) &&
340 (type != SID_NAME_WKN_GRP)) {
341 DEBUG(10, ("%s is a %s, not a group\n", groupname,
342 sid_type_lookup(type)));
343 goto done;
344 }
345
346 if (!sid_to_gid(&group_sid, &gid)) {
347 DEBUG(10, ("sid_to_gid(%s) for %s failed\n",
348 sid_string_dbg(&group_sid), groupname));
349 goto done;
350 }
351
352 /*
353 * If the user has been forced and the forced group starts with a '+',
354 * then we only set the group to be the forced group if the forced
355 * user is a member of that group. Otherwise, the meaning of the '+'
356 * would be ignored.
357 */
358
359 if (force_user && user_must_be_member) {
360 if (user_in_group_sid(username, &group_sid)) {
361 sid_copy(pgroup_sid, &group_sid);
362 *pgid = gid;
363 DEBUG(3,("Forced group %s for member %s\n",
364 groupname, username));
365 } else {
366 DEBUG(0,("find_forced_group: forced user %s is not a member "
367 "of forced group %s. Disallowing access.\n",
368 username, groupname ));
369 result = NT_STATUS_MEMBER_NOT_IN_GROUP;
370 goto done;
371 }
372 } else {
373 sid_copy(pgroup_sid, &group_sid);
374 *pgid = gid;
375 DEBUG(3,("Forced group %s\n", groupname));
376 }
377
378 result = NT_STATUS_OK;
379 done:
380 TALLOC_FREE(frame);
381 return result;
382 }
383
384 /****************************************************************************
385 Create an auth_session_info structure for a connection_struct
386 ****************************************************************************/
387
388 static NTSTATUS create_connection_session_info(struct smbd_server_connection *sconn,
389 TALLOC_CTX *mem_ctx, int snum,
390 struct auth_session_info *session_info,
391 struct auth_session_info **presult)
392 {
393 struct auth_session_info *result;
394
395 if (lp_guest_only(snum)) {
396 return make_session_info_guest(mem_ctx, presult);
397 }
398
399 /*
400 * This is the normal security != share case where we have a
401 * valid vuid from the session setup. */
402
403 if (security_session_user_level(session_info, NULL) < SECURITY_USER) {
404 if (!lp_guest_ok(snum)) {
405 DEBUG(2, ("guest user (from session setup) "
406 "not permitted to access this share "
407 "(%s)\n", lp_servicename(talloc_tos(), snum)));
408 return NT_STATUS_ACCESS_DENIED;
409 }
410 } else {
411 if (!user_ok_token(session_info->unix_info->unix_name,
412 session_info->info->domain_name,
413 session_info->security_token, snum)) {
414 DEBUG(2, ("user '%s' (from session setup) not "
415 "permitted to access this share "
416 "(%s)\n",
417 session_info->unix_info->unix_name,
418 lp_servicename(talloc_tos(), snum)));
419 return NT_STATUS_ACCESS_DENIED;
420 }
421 }
422
423 result = copy_session_info(mem_ctx, session_info);
424 if (result == NULL) {
425 return NT_STATUS_NO_MEMORY;
426 }
427
428 *presult = result;
429 return NT_STATUS_OK;
430 }
431
432 /****************************************************************************
433 set relavent user and group settings corresponding to force user/group
434 configuration for the given snum.
435 ****************************************************************************/
436
437 NTSTATUS set_conn_force_user_group(connection_struct *conn, int snum)
438 {
439 NTSTATUS status;
440
441 if (*lp_force_user(talloc_tos(), snum)) {
442
443 /*
444 * Replace conn->session_info with a completely faked up one
445 * from the username we are forced into :-)
446 */
447
448 char *fuser;
449 char *sanitized_username;
450 struct auth_session_info *forced_serverinfo;
451 bool guest;
452
453 fuser = talloc_string_sub(conn, lp_force_user(talloc_tos(), snum), "%S",
454 lp_const_servicename(snum));
455 if (fuser == NULL) {
456 return NT_STATUS_NO_MEMORY;
457 }
458
459 guest = security_session_user_level(conn->session_info, NULL) < SECURITY_USER;
460
461 status = make_session_info_from_username(
462 conn, fuser,
463 guest,
464 &forced_serverinfo);
465 if (!NT_STATUS_IS_OK(status)) {
466 return status;
467 }
468
469 /* We don't want to replace the original sanitized_username
470 as it is the original user given in the connect attempt.
471 This is used in '%U' substitutions. */
472 sanitized_username = discard_const_p(char,
473 forced_serverinfo->unix_info->sanitized_username);
474 TALLOC_FREE(sanitized_username);
475 forced_serverinfo->unix_info->sanitized_username =
476 talloc_move(forced_serverinfo->unix_info,
477 &conn->session_info->unix_info->sanitized_username);
478
479 TALLOC_FREE(conn->session_info);
480 conn->session_info = forced_serverinfo;
481
482 conn->force_user = true;
483 DEBUG(3,("Forced user %s\n", fuser));
484 }
485
486 /*
487 * If force group is true, then override
488 * any groupid stored for the connecting user.
489 */
490
491 if (*lp_force_group(talloc_tos(), snum)) {
492
493 status = find_forced_group(
494 conn->force_user, snum, conn->session_info->unix_info->unix_name,
495 &conn->session_info->security_token->sids[1],
496 &conn->session_info->unix_token->gid);
497
498 if (!NT_STATUS_IS_OK(status)) {
499 return status;
500 }
501
502 /*
503 * We need to cache this gid, to use within
504 * change_to_user() separately from the conn->session_info
505 * struct. We only use conn->session_info directly if
506 * "force_user" was set.
507 */
508 conn->force_group_gid = conn->session_info->unix_token->gid;
509 }
510
511 return NT_STATUS_OK;
512 }
513
514 /****************************************************************************
515 Setup the share access mask for a connection.
516 ****************************************************************************/
517
518 uint32_t create_share_access_mask(connection_struct *conn,
519 int snum,
520 const struct security_token *token)
521 {
522 uint32_t share_access = 0;
523
524 share_access_check(token,
525 lp_servicename(talloc_tos(), snum),
526 MAXIMUM_ALLOWED_ACCESS,
527 &share_access);
528
529 if (!CAN_WRITE(conn)) {
530 share_access &=
531 ~(SEC_FILE_WRITE_DATA | SEC_FILE_APPEND_DATA |
532 SEC_FILE_WRITE_EA | SEC_FILE_WRITE_ATTRIBUTE |
533 SEC_DIR_DELETE_CHILD );
534 }
535
536 if (security_token_has_privilege(token, SEC_PRIV_SECURITY)) {
537 share_access |= SEC_FLAG_SYSTEM_SECURITY;
538 }
539 if (security_token_has_privilege(token, SEC_PRIV_RESTORE)) {
540 share_access |= (SEC_RIGHTS_PRIV_RESTORE);
541 }
542 if (security_token_has_privilege(token, SEC_PRIV_BACKUP)) {
543 share_access |= (SEC_RIGHTS_PRIV_BACKUP);
544 }
545 if (security_token_has_privilege(token, SEC_PRIV_TAKE_OWNERSHIP)) {
546 share_access |= (SEC_STD_WRITE_OWNER);
547 }
548
549 return share_access;
550 }
551
552 /****************************************************************************
553 Make a connection, given the snum to connect to, and the vuser of the
554 connecting user if appropriate.
555 ****************************************************************************/
556
557 static NTSTATUS make_connection_snum(struct smbd_server_connection *sconn,
558 connection_struct *conn,
559 int snum, struct user_struct *vuser,
560 const char *pdev)
561 {
562 struct smb_filename *smb_fname_cpath = NULL;
563 fstring dev;
564 int ret;
565 bool on_err_call_dis_hook = false;
566 uid_t effuid;
567 gid_t effgid;
568 NTSTATUS status;
569
570 fstrcpy(dev, pdev);
571
572 status = share_sanity_checks(sconn->remote_address,
573 sconn->remote_hostname,
574 snum,
575 dev);
576 if (NT_STATUS_IS_ERR(status)) {
577 goto err_root_exit;
578 }
579
580 conn->params->service = snum;
581
582 status = create_connection_session_info(sconn,
583 conn, snum, vuser->session_info,
584 &conn->session_info);
585
586 if (!NT_STATUS_IS_OK(status)) {
587 DEBUG(1, ("create_connection_session_info failed: %s\n",
588 nt_errstr(status)));
589 goto err_root_exit;
590 }
591
592 if (lp_guest_only(snum)) {
593 conn->force_user = true;
594 }
595
596 conn->num_files_open = 0;
597 conn->lastused = conn->lastused_count = time(NULL);
598 conn->printer = (strncmp(dev,"LPT",3) == 0);
599 conn->ipc = ( (strncmp(dev,"IPC",3) == 0) ||
600 ( lp_enable_asu_support() && strequal(dev,"ADMIN$")) );
601
602 /* Case options for the share. */
603 if (lp_casesensitive(snum) == Auto) {
604 /* We will be setting this per packet. Set to be case
605 * insensitive for now. */
606 conn->case_sensitive = False;
607 } else {
608 conn->case_sensitive = (bool)lp_casesensitive(snum);
609 }
610
611 conn->case_preserve = lp_preservecase(snum);
612 conn->short_case_preserve = lp_shortpreservecase(snum);
613
614 conn->encrypt_level = lp_smb_encrypt(snum);
615
616 conn->veto_list = NULL;
617 conn->hide_list = NULL;
618 conn->veto_oplock_list = NULL;
619 conn->aio_write_behind_list = NULL;
620
621 conn->read_only = lp_readonly(SNUM(conn));
622
623 status = set_conn_force_user_group(conn, snum);
624 if (!NT_STATUS_IS_OK(status)) {
625 goto err_root_exit;
626 }
627
628 conn->vuid = vuser->vuid;
629
630 {
631 char *s = talloc_sub_advanced(talloc_tos(),
632 lp_servicename(talloc_tos(), SNUM(conn)),
633 conn->session_info->unix_info->unix_name,
634 conn->connectpath,
635 conn->session_info->unix_token->gid,
636 conn->session_info->unix_info->sanitized_username,
637 conn->session_info->info->domain_name,
638 lp_pathname(talloc_tos(), snum));
639 if (!s) {
640 status = NT_STATUS_NO_MEMORY;
641 goto err_root_exit;
642 }
643
644 if (!set_conn_connectpath(conn,s)) {
645 TALLOC_FREE(s);
646 status = NT_STATUS_NO_MEMORY;
647 goto err_root_exit;
648 }
649 DEBUG(3,("Connect path is '%s' for service [%s]\n",s,
650 lp_servicename(talloc_tos(), snum)));
651 TALLOC_FREE(s);
652 }
653
654 /*
655 * New code to check if there's a share security descripter
656 * added from NT server manager. This is done after the
657 * smb.conf checks are done as we need a uid and token. JRA.
658 *
659 */
660
661 conn->share_access = create_share_access_mask(conn,
662 snum,
663 conn->session_info->security_token);
664
665 if ((conn->share_access & FILE_WRITE_DATA) == 0) {
666 if ((conn->share_access & FILE_READ_DATA) == 0) {
667 /* No access, read or write. */
668 DEBUG(0,("make_connection: connection to %s "
669 "denied due to security "
670 "descriptor.\n",
671 lp_servicename(talloc_tos(), snum)));
672 status = NT_STATUS_ACCESS_DENIED;
673 goto err_root_exit;
674 } else {
675 conn->read_only = True;
676 }
677 }
678 /* Initialise VFS function pointers */
679
680 if (!smbd_vfs_init(conn)) {
681 DEBUG(0, ("vfs_init failed for service %s\n",
682 lp_servicename(talloc_tos(), snum)));
683 status = NT_STATUS_BAD_NETWORK_NAME;
684 goto err_root_exit;
685 }
686
687 /* ROOT Activities: */
688 /* explicitly check widelinks here so that we can correctly warn
689 * in the logs. */
690 widelinks_warning(snum);
691
692 /*
693 * Enforce the max connections parameter.
694 */
695
696 if ((lp_max_connections(snum) > 0)
697 && (count_current_connections(lp_servicename(talloc_tos(), SNUM(conn)), True) >=
698 lp_max_connections(snum))) {
699
700 DEBUG(1, ("Max connections (%d) exceeded for %s\n",
701 lp_max_connections(snum),
702 lp_servicename(talloc_tos(), snum)));
703 status = NT_STATUS_INSUFFICIENT_RESOURCES;
704 goto err_root_exit;
705 }
706
707 /* Invoke VFS make connection hook - this must be the first
708 filesystem operation that we do. */
709
710 if (SMB_VFS_CONNECT(conn, lp_servicename(talloc_tos(), snum),
711 conn->session_info->unix_info->unix_name) < 0) {
712 DEBUG(0,("make_connection: VFS make connection failed!\n"));
713 status = NT_STATUS_UNSUCCESSFUL;
714 goto err_root_exit;
715 }
716
717 /* Any error exit after here needs to call the disconnect hook. */
718 on_err_call_dis_hook = true;
719
720 if ((!conn->printer) && (!conn->ipc) &&
721 lp_change_notify(conn->params)) {
722 if (sconn->notify_ctx == NULL) {
723 sconn->notify_ctx = notify_init(
724 sconn, sconn->msg_ctx, sconn->ev_ctx);
725 }
726 if (sconn->sys_notify_ctx == NULL) {
727 sconn->sys_notify_ctx = sys_notify_context_create(
728 sconn, sconn->ev_ctx);
729 }
730 }
731
732 if (lp_kernel_oplocks(snum)) {
733 init_kernel_oplocks(conn->sconn);
734 }
735
736 /*
737 * Fix compatibility issue pointed out by Volker.
738 * We pass the conn->connectpath to the preexec
739 * scripts as a parameter, so attempt to canonicalize
740 * it here before calling the preexec scripts.
741 * We ignore errors here, as it is possible that
742 * the conn->connectpath doesn't exist yet and
743 * the preexec scripts will create them.
744 */
745
746 (void)canonicalize_connect_path(conn);
747
748 /* Preexecs are done here as they might make the dir we are to ChDir
749 * to below */
750 /* execute any "root preexec = " line */
751 if (*lp_rootpreexec(talloc_tos(), snum)) {
752 char *cmd = talloc_sub_advanced(talloc_tos(),
753 lp_servicename(talloc_tos(), SNUM(conn)),
754 conn->session_info->unix_info->unix_name,
755 conn->connectpath,
756 conn->session_info->unix_token->gid,
757 conn->session_info->unix_info->sanitized_username,
758 conn->session_info->info->domain_name,
759 lp_rootpreexec(talloc_tos(), snum));
760 DEBUG(5,("cmd=%s\n",cmd));
761 ret = smbrun(cmd,NULL);
762 TALLOC_FREE(cmd);
763 if (ret != 0 && lp_rootpreexec_close(snum)) {
764 DEBUG(1,("root preexec gave %d - failing "
765 "connection\n", ret));
766 status = NT_STATUS_ACCESS_DENIED;
767 goto err_root_exit;
768 }
769 }
770
771 /* USER Activites: */
772 if (!change_to_user(conn, conn->vuid)) {
773 /* No point continuing if they fail the basic checks */
774 DEBUG(0,("Can't become connected user!\n"));
775 status = NT_STATUS_LOGON_FAILURE;
776 goto err_root_exit;
777 }
778
779 effuid = geteuid();
780 effgid = getegid();
781
782 /* Remember that a different vuid can connect later without these
783 * checks... */
784
785 /* Preexecs are done here as they might make the dir we are to ChDir
786 * to below */
787
788 /* execute any "preexec = " line */
789 if (*lp_preexec(talloc_tos(), snum)) {
790 char *cmd = talloc_sub_advanced(talloc_tos(),
791 lp_servicename(talloc_tos(), SNUM(conn)),
792 conn->session_info->unix_info->unix_name,
793 conn->connectpath,
794 conn->session_info->unix_token->gid,
795 conn->session_info->unix_info->sanitized_username,
796 conn->session_info->info->domain_name,
797 lp_preexec(talloc_tos(), snum));
798 ret = smbrun(cmd,NULL);
799 TALLOC_FREE(cmd);
800 if (ret != 0 && lp_preexec_close(snum)) {
801 DEBUG(1,("preexec gave %d - failing connection\n",
802 ret));
803 status = NT_STATUS_ACCESS_DENIED;
804 goto err_root_exit;
805 }
806 }
807
808 #ifdef WITH_FAKE_KASERVER
809 if (lp_afs_share(snum)) {
810 afs_login(conn);
811 }
812 #endif
813
814 /*
815 * we've finished with the user stuff - go back to root
816 * so the SMB_VFS_STAT call will only fail on path errors,
817 * not permission problems.
818 */
819 change_to_root_user();
820 /* ROOT Activites: */
821
822 /*
823 * If widelinks are disallowed we need to canonicalise the connect
824 * path here to ensure we don't have any symlinks in the
825 * connectpath. We will be checking all paths on this connection are
826 * below this directory. We must do this after the VFS init as we
827 * depend on the realpath() pointer in the vfs table. JRA.
828 */
829 if (!lp_widelinks(snum)) {
830 if (!canonicalize_connect_path(conn)) {
831 DEBUG(0, ("canonicalize_connect_path failed "
832 "for service %s, path %s\n",
833 lp_servicename(talloc_tos(), snum),
834 conn->connectpath));
835 status = NT_STATUS_BAD_NETWORK_NAME;
836 goto err_root_exit;
837 }
838 }
839
840 /* Add veto/hide lists */
841 if (!IS_IPC(conn) && !IS_PRINT(conn)) {
842 set_namearray( &conn->veto_list,
843 lp_veto_files(talloc_tos(), snum));
844 set_namearray( &conn->hide_list,
845 lp_hide_files(talloc_tos(), snum));
846 set_namearray( &conn->veto_oplock_list,
847 lp_veto_oplocks(talloc_tos(), snum));
848 set_namearray( &conn->aio_write_behind_list,
849 lp_aio_write_behind(talloc_tos(), snum));
850 }
851 status = create_synthetic_smb_fname(talloc_tos(), conn->connectpath,
852 NULL, NULL, &smb_fname_cpath);
853 if (!NT_STATUS_IS_OK(status)) {
854 goto err_root_exit;
855 }
856
857 /* win2000 does not check the permissions on the directory
858 during the tree connect, instead relying on permission
859 check during individual operations. To match this behaviour
860 I have disabled this chdir check (tridge) */
861 /* the alternative is just to check the directory exists */
862
863 if ((ret = SMB_VFS_STAT(conn, smb_fname_cpath)) != 0 ||
864 !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
865 if (ret == 0 && !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
866 DEBUG(0,("'%s' is not a directory, when connecting to "
867 "[%s]\n", conn->connectpath,
868 lp_servicename(talloc_tos(), snum)));
869 } else {
870 DEBUG(0,("'%s' does not exist or permission denied "
871 "when connecting to [%s] Error was %s\n",
872 conn->connectpath,
873 lp_servicename(talloc_tos(), snum),
874 strerror(errno) ));
875 }
876 status = NT_STATUS_BAD_NETWORK_NAME;
877 goto err_root_exit;
878 }
879 conn->base_share_dev = smb_fname_cpath->st.st_ex_dev;
880
881 talloc_free(conn->origpath);
882 conn->origpath = talloc_strdup(conn, conn->connectpath);
883
884 /* Figure out the characteristics of the underlying filesystem. This
885 * assumes that all the filesystem mounted withing a share path have
886 * the same characteristics, which is likely but not guaranteed.
887 */
888
889 conn->fs_capabilities = SMB_VFS_FS_CAPABILITIES(conn, &conn->ts_res);
890
891 /*
892 * Print out the 'connected as' stuff here as we need
893 * to know the effective uid and gid we will be using
894 * (at least initially).
895 */
896
897 if( DEBUGLVL( IS_IPC(conn) ? 3 : 1 ) ) {
898 dbgtext( "%s (%s) ", get_remote_machine_name(),
899 tsocket_address_string(conn->sconn->remote_address,
900 talloc_tos()) );
901 dbgtext( "%s", srv_is_signing_active(sconn) ? "signed " : "");
902 dbgtext( "connect to service %s ",
903 lp_servicename(talloc_tos(), snum) );
904 dbgtext( "initially as user %s ",
905 conn->session_info->unix_info->unix_name );
906 dbgtext( "(uid=%d, gid=%d) ", (int)effuid, (int)effgid );
907 dbgtext( "(pid %d)\n", (int)getpid() );
908 }
909
910 return status;
911
912 err_root_exit:
913
914 TALLOC_FREE(smb_fname_cpath);
915 /* We must exit this function as root. */
916 if (geteuid() != 0) {
917 change_to_root_user();
918 }
919 if (on_err_call_dis_hook) {
920 /* Call VFS disconnect hook */
921 SMB_VFS_DISCONNECT(conn);
922 }
923 return status;
924 }
925
926 /****************************************************************************
927 Make a connection to a service from SMB1. Internal interface.
928 ****************************************************************************/
929
930 static connection_struct *make_connection_smb1(struct smbd_server_connection *sconn,
931 NTTIME now,
932 int snum, struct user_struct *vuser,
933 const char *pdev,
934 NTSTATUS *pstatus)
935 {
936 struct smbXsrv_tcon *tcon;
937 NTSTATUS status;
938 struct connection_struct *conn;
939
940 status = smb1srv_tcon_create(sconn->conn, now, &tcon);
941 if (!NT_STATUS_IS_OK(status)) {
942 DEBUG(0,("make_connection_smb1: Couldn't find free tcon %s.\n",
943 nt_errstr(status)));
944 *pstatus = status;
945 return NULL;
946 }
947
948 conn = conn_new(sconn);
949 if (!conn) {
950 TALLOC_FREE(tcon);
951
952 DEBUG(0,("make_connection_smb1: Couldn't find free connection.\n"));
953 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
954 return NULL;
955 }
956
957 conn->cnum = tcon->global->tcon_wire_id;
958 conn->tcon = tcon;
959
960 *pstatus = make_connection_snum(sconn,
961 conn,
962 snum,
963 vuser,
964 pdev);
965 if (!NT_STATUS_IS_OK(*pstatus)) {
966 conn_free(conn);
967 TALLOC_FREE(tcon);
968 return NULL;
969 }
970
971 tcon->global->share_name = lp_servicename(tcon->global, SNUM(conn));
972 if (tcon->global->share_name == NULL) {
973 conn_free(conn);
974 TALLOC_FREE(tcon);
975 *pstatus = NT_STATUS_NO_MEMORY;
976 return NULL;
977 }
978 tcon->global->session_global_id =
979 vuser->session->global->session_global_id;
980
981 tcon->compat = talloc_move(tcon, &conn);
982 tcon->status = NT_STATUS_OK;
983
984 *pstatus = smbXsrv_tcon_update(tcon);
985 if (!NT_STATUS_IS_OK(*pstatus)) {
986 TALLOC_FREE(tcon);
987 return NULL;
988 }
989
990 return tcon->compat;
991 }
992
993 /****************************************************************************
994 Make a connection to a service from SMB2. External SMB2 interface.
995 We must set cnum before claiming connection.
996 ****************************************************************************/
997
998 connection_struct *make_connection_smb2(struct smbd_server_connection *sconn,
999 struct smbXsrv_tcon *tcon,
1000 int snum,
1001 struct user_struct *vuser,
1002 const char *pdev,
1003 NTSTATUS *pstatus)
1004 {
1005 connection_struct *conn = conn_new(sconn);
1006 if (!conn) {
1007 DEBUG(0,("make_connection_smb2: Couldn't find free connection.\n"));
1008 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
1009 return NULL;
1010 }
1011
1012 conn->cnum = tcon->global->tcon_wire_id;
1013 conn->tcon = tcon;
1014
1015 *pstatus = make_connection_snum(sconn,
1016 conn,
1017 snum,
1018 vuser,
1019 pdev);
1020 if (!NT_STATUS_IS_OK(*pstatus)) {
1021 conn_free(conn);
1022 return NULL;
1023 }
1024 return conn;
1025 }
1026
1027 /****************************************************************************
1028 Make a connection to a service. External SMB1 interface.
1029 *
1030 * @param service
1031 ****************************************************************************/
1032
1033 connection_struct *make_connection(struct smbd_server_connection *sconn,
1034 NTTIME now,
1035 const char *service_in,
1036 const char *pdev, uint64_t vuid,
1037 NTSTATUS *status)
1038 {
1039 uid_t euid;
1040 struct user_struct *vuser = NULL;
1041 char *service = NULL;
1042 fstring dev;
1043 int snum = -1;
1044
1045 fstrcpy(dev, pdev);
1046
1047 /* This must ONLY BE CALLED AS ROOT. As it exits this function as
1048 * root. */
1049 if (!non_root_mode() && (euid = geteuid()) != 0) {
1050 DEBUG(0,("make_connection: PANIC ERROR. Called as nonroot "
1051 "(%u)\n", (unsigned int)euid ));
1052 smb_panic("make_connection: PANIC ERROR. Called as nonroot\n");
1053 }
1054
1055 if (conn_num_open(sconn) > 2047) {
1056 *status = NT_STATUS_INSUFF_SERVER_RESOURCES;
1057 return NULL;
1058 }
1059
1060 vuser = get_valid_user_struct(sconn, vuid);
1061 if (!vuser) {
1062 DEBUG(1,("make_connection: refusing to connect with "
1063 "no session setup\n"));
1064 *status = NT_STATUS_ACCESS_DENIED;
1065 return NULL;
1066 }
1067
1068 /* Logic to try and connect to the correct [homes] share, preferably
1069 without too many getpwnam() lookups. This is particulary nasty for
1070 winbind usernames, where the share name isn't the same as unix
1071 username.
1072
1073 The snum of the homes share is stored on the vuser at session setup
1074 time.
1075 */
1076
1077 if (strequal(service_in,HOMES_NAME)) {
1078 if (vuser->homes_snum == -1) {
1079 DEBUG(2, ("[homes] share not available for "
1080 "this user because it was not found "
1081 "or created at session setup "
1082 "time\n"));
1083 *status = NT_STATUS_BAD_NETWORK_NAME;
1084 return NULL;
1085 }
1086 DEBUG(5, ("making a connection to [homes] service "
1087 "created at session setup time\n"));
1088 return make_connection_smb1(sconn, now,
1089 vuser->homes_snum,
1090 vuser,
1091 dev, status);
1092 } else if ((vuser->homes_snum != -1)
1093 && strequal(service_in,
1094 lp_servicename(talloc_tos(), vuser->homes_snum))) {
1095 DEBUG(5, ("making a connection to 'homes' service [%s] "
1096 "created at session setup time\n", service_in));
1097 return make_connection_smb1(sconn, now,
1098 vuser->homes_snum,
1099 vuser,
1100 dev, status);
1101 }
1102
1103 service = talloc_strdup(talloc_tos(), service_in);
1104 if (!service) {
1105 *status = NT_STATUS_NO_MEMORY;
1106 return NULL;
1107 }
1108
1109 if (!strlower_m(service)) {
1110 DEBUG(2, ("strlower_m %s failed\n", service));
1111 *status = NT_STATUS_INVALID_PARAMETER;
1112 return NULL;
1113 }
1114
1115 snum = find_service(talloc_tos(), service, &service);
1116 if (!service) {
1117 *status = NT_STATUS_NO_MEMORY;
1118 return NULL;
1119 }
1120
1121 if (snum < 0) {
1122 if (strequal(service,"IPC$") ||
1123 (lp_enable_asu_support() && strequal(service,"ADMIN$"))) {
1124 DEBUG(3,("refusing IPC connection to %s\n", service));
1125 *status = NT_STATUS_ACCESS_DENIED;
1126 return NULL;
1127 }
1128
1129 DEBUG(3,("%s (%s) couldn't find service %s\n",
1130 get_remote_machine_name(),
1131 tsocket_address_string(
1132 sconn->remote_address, talloc_tos()),
1133 service));
1134 *status = NT_STATUS_BAD_NETWORK_NAME;
1135 return NULL;
1136 }
1137
1138 /* Handle non-Dfs clients attempting connections to msdfs proxy */
1139 if (lp_host_msdfs() && (*lp_msdfs_proxy(talloc_tos(), snum) != '\0')) {
1140 DEBUG(3, ("refusing connection to dfs proxy share '%s' "
1141 "(pointing to %s)\n",
1142 service, lp_msdfs_proxy(talloc_tos(), snum)));
1143 *status = NT_STATUS_BAD_NETWORK_NAME;
1144 return NULL;
1145 }
1146
1147 DEBUG(5, ("making a connection to 'normal' service %s\n", service));
1148
1149 return make_connection_smb1(sconn, now, snum, vuser,
1150 dev, status);
1151 }
1152
1153 /****************************************************************************
1154 Close a cnum.
1155 ****************************************************************************/
1156
1157 void close_cnum(connection_struct *conn, uint64_t vuid)
1158 {
1159 file_close_conn(conn);
1160
1161 if (!IS_IPC(conn)) {
1162 dptr_closecnum(conn);
1163 }
1164
1165 change_to_root_user();
1166
1167 DEBUG(IS_IPC(conn)?3:1, ("%s (%s) closed connection to service %s\n",
1168 get_remote_machine_name(),
1169 tsocket_address_string(conn->sconn->remote_address,
1170 talloc_tos()),
1171 lp_servicename(talloc_tos(), SNUM(conn))));
1172
1173 /* Call VFS disconnect hook */
1174 SMB_VFS_DISCONNECT(conn);
1175
1176 /* make sure we leave the directory available for unmount */
1177 vfs_ChDir(conn, "/");
1178
1179 /* execute any "postexec = " line */
1180 if (*lp_postexec(talloc_tos(), SNUM(conn)) &&
1181 change_to_user(conn, vuid)) {
1182 char *cmd = talloc_sub_advanced(talloc_tos(),
1183 lp_servicename(talloc_tos(), SNUM(conn)),
1184 conn->session_info->unix_info->unix_name,
1185 conn->connectpath,
1186 conn->session_info->unix_token->gid,
1187 conn->session_info->unix_info->sanitized_username,
1188 conn->session_info->info->domain_name,
1189 lp_postexec(talloc_tos(), SNUM(conn)));
1190 smbrun(cmd,NULL);
1191 TALLOC_FREE(cmd);
1192 change_to_root_user();
1193 }
1194
1195 change_to_root_user();
1196 /* execute any "root postexec = " line */
1197 if (*lp_rootpostexec(talloc_tos(), SNUM(conn))) {
1198 char *cmd = talloc_sub_advanced(talloc_tos(),
1199 lp_servicename(talloc_tos(), SNUM(conn)),
1200 conn->session_info->unix_info->unix_name,
1201 conn->connectpath,
1202 conn->session_info->unix_token->gid,
1203 conn->session_info->unix_info->sanitized_username,
1204 conn->session_info->info->domain_name,
1205 lp_rootpostexec(talloc_tos(), SNUM(conn)));
1206 smbrun(cmd,NULL);
1207 TALLOC_FREE(cmd);
1208 }
1209
1210 conn_free(conn);
1211 }
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