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s3: For read-only shares, filter out write bits from conn->access_mask
[Samba/gebeck_regimport.git] / source3 / smbd / service.c
blobb74192cec873833ceb29f82df03becbbbf12f4e9
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 static void create_share_access_mask(connection_struct *conn, int snum)
519 {
520 const struct security_token *token = conn->session_info->security_token;
521
522 share_access_check(token,
523 lp_servicename(talloc_tos(), snum),
524 MAXIMUM_ALLOWED_ACCESS,
525 &conn->share_access);
526
527 if (!CAN_WRITE(conn)) {
528 conn->share_access &=
529 ~(SEC_FILE_WRITE_DATA | SEC_FILE_APPEND_DATA |
530 SEC_FILE_WRITE_EA | SEC_FILE_WRITE_ATTRIBUTE |
531 SEC_DIR_DELETE_CHILD );
532 }
533
534 if (security_token_has_privilege(token, SEC_PRIV_SECURITY)) {
535 conn->share_access |= SEC_FLAG_SYSTEM_SECURITY;
536 }
537 if (security_token_has_privilege(token, SEC_PRIV_RESTORE)) {
538 conn->share_access |= (SEC_RIGHTS_PRIV_RESTORE);
539 }
540 if (security_token_has_privilege(token, SEC_PRIV_BACKUP)) {
541 conn->share_access |= (SEC_RIGHTS_PRIV_BACKUP);
542 }
543 if (security_token_has_privilege(token, SEC_PRIV_TAKE_OWNERSHIP)) {
544 conn->share_access |= (SEC_STD_WRITE_OWNER);
545 }
546 }
547
548 /****************************************************************************
549 Make a connection, given the snum to connect to, and the vuser of the
550 connecting user if appropriate.
551 ****************************************************************************/
552
553 static NTSTATUS make_connection_snum(struct smbd_server_connection *sconn,
554 connection_struct *conn,
555 int snum, struct user_struct *vuser,
556 const char *pdev)
557 {
558 struct smb_filename *smb_fname_cpath = NULL;
559 fstring dev;
560 int ret;
561 bool on_err_call_dis_hook = false;
562 bool claimed_connection = false;
563 uid_t effuid;
564 gid_t effgid;
565 NTSTATUS status;
566
567 fstrcpy(dev, pdev);
568
569 status = share_sanity_checks(sconn->remote_address,
570 sconn->remote_hostname,
571 snum,
572 dev);
573 if (NT_STATUS_IS_ERR(status)) {
574 goto err_root_exit;
575 }
576
577 conn->params->service = snum;
578
579 status = create_connection_session_info(sconn,
580 conn, snum, vuser->session_info,
581 &conn->session_info);
582
583 if (!NT_STATUS_IS_OK(status)) {
584 DEBUG(1, ("create_connection_session_info failed: %s\n",
585 nt_errstr(status)));
586 goto err_root_exit;
587 }
588
589 if (lp_guest_only(snum)) {
590 conn->force_user = true;
591 }
592
593 conn->num_files_open = 0;
594 conn->lastused = conn->lastused_count = time(NULL);
595 conn->printer = (strncmp(dev,"LPT",3) == 0);
596 conn->ipc = ( (strncmp(dev,"IPC",3) == 0) ||
597 ( lp_enable_asu_support() && strequal(dev,"ADMIN$")) );
598
599 /* Case options for the share. */
600 if (lp_casesensitive(snum) == Auto) {
601 /* We will be setting this per packet. Set to be case
602 * insensitive for now. */
603 conn->case_sensitive = False;
604 } else {
605 conn->case_sensitive = (bool)lp_casesensitive(snum);
606 }
607
608 conn->case_preserve = lp_preservecase(snum);
609 conn->short_case_preserve = lp_shortpreservecase(snum);
610
611 conn->encrypt_level = lp_smb_encrypt(snum);
612
613 conn->veto_list = NULL;
614 conn->hide_list = NULL;
615 conn->veto_oplock_list = NULL;
616 conn->aio_write_behind_list = NULL;
617
618 conn->read_only = lp_readonly(SNUM(conn));
619
620 status = set_conn_force_user_group(conn, snum);
621 if (!NT_STATUS_IS_OK(status)) {
622 goto err_root_exit;
623 }
624
625 conn->vuid = vuser->vuid;
626
627 {
628 char *s = talloc_sub_advanced(talloc_tos(),
629 lp_servicename(talloc_tos(), SNUM(conn)),
630 conn->session_info->unix_info->unix_name,
631 conn->connectpath,
632 conn->session_info->unix_token->gid,
633 conn->session_info->unix_info->sanitized_username,
634 conn->session_info->info->domain_name,
635 lp_pathname(talloc_tos(), snum));
636 if (!s) {
637 status = NT_STATUS_NO_MEMORY;
638 goto err_root_exit;
639 }
640
641 if (!set_conn_connectpath(conn,s)) {
642 TALLOC_FREE(s);
643 status = NT_STATUS_NO_MEMORY;
644 goto err_root_exit;
645 }
646 DEBUG(3,("Connect path is '%s' for service [%s]\n",s,
647 lp_servicename(talloc_tos(), snum)));
648 TALLOC_FREE(s);
649 }
650
651 /*
652 * New code to check if there's a share security descripter
653 * added from NT server manager. This is done after the
654 * smb.conf checks are done as we need a uid and token. JRA.
655 *
656 */
657
658 create_share_access_mask(conn, snum);
659
660 if ((conn->share_access & FILE_WRITE_DATA) == 0) {
661 if ((conn->share_access & FILE_READ_DATA) == 0) {
662 /* No access, read or write. */
663 DEBUG(0,("make_connection: connection to %s "
664 "denied due to security "
665 "descriptor.\n",
666 lp_servicename(talloc_tos(), snum)));
667 status = NT_STATUS_ACCESS_DENIED;
668 goto err_root_exit;
669 } else {
670 conn->read_only = True;
671 }
672 }
673 /* Initialise VFS function pointers */
674
675 if (!smbd_vfs_init(conn)) {
676 DEBUG(0, ("vfs_init failed for service %s\n",
677 lp_servicename(talloc_tos(), snum)));
678 status = NT_STATUS_BAD_NETWORK_NAME;
679 goto err_root_exit;
680 }
681
682 /* ROOT Activities: */
683 /* explicitly check widelinks here so that we can correctly warn
684 * in the logs. */
685 widelinks_warning(snum);
686
687 /*
688 * Enforce the max connections parameter.
689 */
690
691 if ((lp_max_connections(snum) > 0)
692 && (count_current_connections(lp_servicename(talloc_tos(), SNUM(conn)), True) >=
693 lp_max_connections(snum))) {
694
695 DEBUG(1, ("Max connections (%d) exceeded for %s\n",
696 lp_max_connections(snum),
697 lp_servicename(talloc_tos(), snum)));
698 status = NT_STATUS_INSUFFICIENT_RESOURCES;
699 goto err_root_exit;
700 }
701
702 /*
703 * Get us an entry in the connections db
704 */
705 if (!claim_connection(conn, lp_servicename(talloc_tos(), snum))) {
706 DEBUG(1, ("Could not store connections entry\n"));
707 status = NT_STATUS_INTERNAL_DB_ERROR;
708 goto err_root_exit;
709 }
710 claimed_connection = true;
711
712 /* Invoke VFS make connection hook - this must be the first
713 filesystem operation that we do. */
714
715 if (SMB_VFS_CONNECT(conn, lp_servicename(talloc_tos(), snum),
716 conn->session_info->unix_info->unix_name) < 0) {
717 DEBUG(0,("make_connection: VFS make connection failed!\n"));
718 status = NT_STATUS_UNSUCCESSFUL;
719 goto err_root_exit;
720 }
721
722 /* Any error exit after here needs to call the disconnect hook. */
723 on_err_call_dis_hook = true;
724
725 if ((!conn->printer) && (!conn->ipc) &&
726 lp_change_notify(conn->params)) {
727 if (sconn->notify_ctx == NULL) {
728 sconn->notify_ctx = notify_init(
729 sconn, sconn->msg_ctx, sconn->ev_ctx);
730 }
731 if (sconn->sys_notify_ctx == NULL) {
732 sconn->sys_notify_ctx = sys_notify_context_create(
733 sconn, sconn->ev_ctx);
734 }
735 }
736
737 if (lp_kernel_oplocks(snum)) {
738 init_kernel_oplocks(conn->sconn);
739 }
740
741 /*
742 * Fix compatibility issue pointed out by Volker.
743 * We pass the conn->connectpath to the preexec
744 * scripts as a parameter, so attempt to canonicalize
745 * it here before calling the preexec scripts.
746 * We ignore errors here, as it is possible that
747 * the conn->connectpath doesn't exist yet and
748 * the preexec scripts will create them.
749 */
750
751 (void)canonicalize_connect_path(conn);
752
753 /* Preexecs are done here as they might make the dir we are to ChDir
754 * to below */
755 /* execute any "root preexec = " line */
756 if (*lp_rootpreexec(talloc_tos(), snum)) {
757 char *cmd = talloc_sub_advanced(talloc_tos(),
758 lp_servicename(talloc_tos(), SNUM(conn)),
759 conn->session_info->unix_info->unix_name,
760 conn->connectpath,
761 conn->session_info->unix_token->gid,
762 conn->session_info->unix_info->sanitized_username,
763 conn->session_info->info->domain_name,
764 lp_rootpreexec(talloc_tos(), snum));
765 DEBUG(5,("cmd=%s\n",cmd));
766 ret = smbrun(cmd,NULL);
767 TALLOC_FREE(cmd);
768 if (ret != 0 && lp_rootpreexec_close(snum)) {
769 DEBUG(1,("root preexec gave %d - failing "
770 "connection\n", ret));
771 status = NT_STATUS_ACCESS_DENIED;
772 goto err_root_exit;
773 }
774 }
775
776 /* USER Activites: */
777 if (!change_to_user(conn, conn->vuid)) {
778 /* No point continuing if they fail the basic checks */
779 DEBUG(0,("Can't become connected user!\n"));
780 status = NT_STATUS_LOGON_FAILURE;
781 goto err_root_exit;
782 }
783
784 effuid = geteuid();
785 effgid = getegid();
786
787 /* Remember that a different vuid can connect later without these
788 * checks... */
789
790 /* Preexecs are done here as they might make the dir we are to ChDir
791 * to below */
792
793 /* execute any "preexec = " line */
794 if (*lp_preexec(talloc_tos(), snum)) {
795 char *cmd = talloc_sub_advanced(talloc_tos(),
796 lp_servicename(talloc_tos(), SNUM(conn)),
797 conn->session_info->unix_info->unix_name,
798 conn->connectpath,
799 conn->session_info->unix_token->gid,
800 conn->session_info->unix_info->sanitized_username,
801 conn->session_info->info->domain_name,
802 lp_preexec(talloc_tos(), snum));
803 ret = smbrun(cmd,NULL);
804 TALLOC_FREE(cmd);
805 if (ret != 0 && lp_preexec_close(snum)) {
806 DEBUG(1,("preexec gave %d - failing connection\n",
807 ret));
808 status = NT_STATUS_ACCESS_DENIED;
809 goto err_root_exit;
810 }
811 }
812
813 #ifdef WITH_FAKE_KASERVER
814 if (lp_afs_share(snum)) {
815 afs_login(conn);
816 }
817 #endif
818
819 /*
820 * we've finished with the user stuff - go back to root
821 * so the SMB_VFS_STAT call will only fail on path errors,
822 * not permission problems.
823 */
824 change_to_root_user();
825 /* ROOT Activites: */
826
827 /*
828 * If widelinks are disallowed we need to canonicalise the connect
829 * path here to ensure we don't have any symlinks in the
830 * connectpath. We will be checking all paths on this connection are
831 * below this directory. We must do this after the VFS init as we
832 * depend on the realpath() pointer in the vfs table. JRA.
833 */
834 if (!lp_widelinks(snum)) {
835 if (!canonicalize_connect_path(conn)) {
836 DEBUG(0, ("canonicalize_connect_path failed "
837 "for service %s, path %s\n",
838 lp_servicename(talloc_tos(), snum),
839 conn->connectpath));
840 status = NT_STATUS_BAD_NETWORK_NAME;
841 goto err_root_exit;
842 }
843 }
844
845 /* Add veto/hide lists */
846 if (!IS_IPC(conn) && !IS_PRINT(conn)) {
847 set_namearray( &conn->veto_list,
848 lp_veto_files(talloc_tos(), snum));
849 set_namearray( &conn->hide_list,
850 lp_hide_files(talloc_tos(), snum));
851 set_namearray( &conn->veto_oplock_list,
852 lp_veto_oplocks(talloc_tos(), snum));
853 set_namearray( &conn->aio_write_behind_list,
854 lp_aio_write_behind(talloc_tos(), snum));
855 }
856 status = create_synthetic_smb_fname(talloc_tos(), conn->connectpath,
857 NULL, NULL, &smb_fname_cpath);
858 if (!NT_STATUS_IS_OK(status)) {
859 goto err_root_exit;
860 }
861
862 /* win2000 does not check the permissions on the directory
863 during the tree connect, instead relying on permission
864 check during individual operations. To match this behaviour
865 I have disabled this chdir check (tridge) */
866 /* the alternative is just to check the directory exists */
867
868 if ((ret = SMB_VFS_STAT(conn, smb_fname_cpath)) != 0 ||
869 !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
870 if (ret == 0 && !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
871 DEBUG(0,("'%s' is not a directory, when connecting to "
872 "[%s]\n", conn->connectpath,
873 lp_servicename(talloc_tos(), snum)));
874 } else {
875 DEBUG(0,("'%s' does not exist or permission denied "
876 "when connecting to [%s] Error was %s\n",
877 conn->connectpath,
878 lp_servicename(talloc_tos(), snum),
879 strerror(errno) ));
880 }
881 status = NT_STATUS_BAD_NETWORK_NAME;
882 goto err_root_exit;
883 }
884 conn->base_share_dev = smb_fname_cpath->st.st_ex_dev;
885
886 talloc_free(conn->origpath);
887 conn->origpath = talloc_strdup(conn, conn->connectpath);
888
889 /* Figure out the characteristics of the underlying filesystem. This
890 * assumes that all the filesystem mounted withing a share path have
891 * the same characteristics, which is likely but not guaranteed.
892 */
893
894 conn->fs_capabilities = SMB_VFS_FS_CAPABILITIES(conn, &conn->ts_res);
895
896 /*
897 * Print out the 'connected as' stuff here as we need
898 * to know the effective uid and gid we will be using
899 * (at least initially).
900 */
901
902 if( DEBUGLVL( IS_IPC(conn) ? 3 : 1 ) ) {
903 dbgtext( "%s (%s) ", get_remote_machine_name(),
904 tsocket_address_string(conn->sconn->remote_address,
905 talloc_tos()) );
906 dbgtext( "%s", srv_is_signing_active(sconn) ? "signed " : "");
907 dbgtext( "connect to service %s ",
908 lp_servicename(talloc_tos(), snum) );
909 dbgtext( "initially as user %s ",
910 conn->session_info->unix_info->unix_name );
911 dbgtext( "(uid=%d, gid=%d) ", (int)effuid, (int)effgid );
912 dbgtext( "(pid %d)\n", (int)getpid() );
913 }
914
915 return status;
916
917 err_root_exit:
918
919 TALLOC_FREE(smb_fname_cpath);
920 /* We must exit this function as root. */
921 if (geteuid() != 0) {
922 change_to_root_user();
923 }
924 if (on_err_call_dis_hook) {
925 /* Call VFS disconnect hook */
926 SMB_VFS_DISCONNECT(conn);
927 }
928 if (claimed_connection) {
929 yield_connection(conn, lp_servicename(talloc_tos(), snum));
930 }
931 return status;
932 }
933
934 /****************************************************************************
935 Make a connection to a service from SMB1. Internal interface.
936 ****************************************************************************/
937
938 static connection_struct *make_connection_smb1(struct smbd_server_connection *sconn,
939 int snum, struct user_struct *vuser,
940 const char *pdev,
941 NTSTATUS *pstatus)
942 {
943 struct smbXsrv_tcon *tcon;
944 NTSTATUS status;
945 NTTIME now = 0;
946 struct connection_struct *conn;
947
948 status = smb1srv_tcon_create(sconn->conn, now, &tcon);
949 if (!NT_STATUS_IS_OK(status)) {
950 DEBUG(0,("make_connection_smb1: Couldn't find free tcon %s.\n",
951 nt_errstr(status)));
952 *pstatus = status;
953 return NULL;
954 }
955
956 conn = conn_new(sconn);
957 if (!conn) {
958 TALLOC_FREE(tcon);
959
960 DEBUG(0,("make_connection_smb1: Couldn't find free connection.\n"));
961 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
962 return NULL;
963 }
964
965 conn->cnum = tcon->global->tcon_wire_id;
966 conn->tcon = tcon;
967
968 *pstatus = make_connection_snum(sconn,
969 conn,
970 snum,
971 vuser,
972 pdev);
973 if (!NT_STATUS_IS_OK(*pstatus)) {
974 conn_free(conn);
975 TALLOC_FREE(tcon);
976 return NULL;
977 }
978
979 tcon->global->share_name = lp_servicename(tcon->global, SNUM(conn));
980 if (tcon->global->share_name == NULL) {
981 conn_free(conn);
982 TALLOC_FREE(tcon);
983 *pstatus = NT_STATUS_NO_MEMORY;
984 return NULL;
985 }
986
987 tcon->compat = talloc_move(tcon, &conn);
988 tcon->status = NT_STATUS_OK;
989
990 *pstatus = smbXsrv_tcon_update(tcon);
991 if (!NT_STATUS_IS_OK(*pstatus)) {
992 TALLOC_FREE(tcon);
993 return NULL;
994 }
995
996 return tcon->compat;
997 }
998
999 /****************************************************************************
1000 Make a connection to a service from SMB2. External SMB2 interface.
1001 We must set cnum before claiming connection.
1002 ****************************************************************************/
1003
1004 connection_struct *make_connection_smb2(struct smbd_server_connection *sconn,
1005 struct smbXsrv_tcon *tcon,
1006 int snum,
1007 struct user_struct *vuser,
1008 const char *pdev,
1009 NTSTATUS *pstatus)
1010 {
1011 connection_struct *conn = conn_new(sconn);
1012 if (!conn) {
1013 DEBUG(0,("make_connection_smb2: Couldn't find free connection.\n"));
1014 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
1015 return NULL;
1016 }
1017
1018 conn->cnum = tcon->global->tcon_wire_id;
1019 conn->tcon = tcon;
1020
1021 *pstatus = make_connection_snum(sconn,
1022 conn,
1023 snum,
1024 vuser,
1025 pdev);
1026 if (!NT_STATUS_IS_OK(*pstatus)) {
1027 conn_free(conn);
1028 return NULL;
1029 }
1030 return conn;
1031 }
1032
1033 /****************************************************************************
1034 Make a connection to a service. External SMB1 interface.
1035 *
1036 * @param service
1037 ****************************************************************************/
1038
1039 connection_struct *make_connection(struct smbd_server_connection *sconn,
1040 const char *service_in,
1041 const char *pdev, uint64_t vuid,
1042 NTSTATUS *status)
1043 {
1044 uid_t euid;
1045 struct user_struct *vuser = NULL;
1046 char *service = NULL;
1047 fstring dev;
1048 int snum = -1;
1049
1050 fstrcpy(dev, pdev);
1051
1052 /* This must ONLY BE CALLED AS ROOT. As it exits this function as
1053 * root. */
1054 if (!non_root_mode() && (euid = geteuid()) != 0) {
1055 DEBUG(0,("make_connection: PANIC ERROR. Called as nonroot "
1056 "(%u)\n", (unsigned int)euid ));
1057 smb_panic("make_connection: PANIC ERROR. Called as nonroot\n");
1058 }
1059
1060 if (conn_num_open(sconn) > 2047) {
1061 *status = NT_STATUS_INSUFF_SERVER_RESOURCES;
1062 return NULL;
1063 }
1064
1065 vuser = get_valid_user_struct(sconn, vuid);
1066 if (!vuser) {
1067 DEBUG(1,("make_connection: refusing to connect with "
1068 "no session setup\n"));
1069 *status = NT_STATUS_ACCESS_DENIED;
1070 return NULL;
1071 }
1072
1073 /* Logic to try and connect to the correct [homes] share, preferably
1074 without too many getpwnam() lookups. This is particulary nasty for
1075 winbind usernames, where the share name isn't the same as unix
1076 username.
1077
1078 The snum of the homes share is stored on the vuser at session setup
1079 time.
1080 */
1081
1082 if (strequal(service_in,HOMES_NAME)) {
1083 if (vuser->homes_snum == -1) {
1084 DEBUG(2, ("[homes] share not available for "
1085 "this user because it was not found "
1086 "or created at session setup "
1087 "time\n"));
1088 *status = NT_STATUS_BAD_NETWORK_NAME;
1089 return NULL;
1090 }
1091 DEBUG(5, ("making a connection to [homes] service "
1092 "created at session setup time\n"));
1093 return make_connection_smb1(sconn,
1094 vuser->homes_snum,
1095 vuser,
1096 dev, status);
1097 } else if ((vuser->homes_snum != -1)
1098 && strequal(service_in,
1099 lp_servicename(talloc_tos(), vuser->homes_snum))) {
1100 DEBUG(5, ("making a connection to 'homes' service [%s] "
1101 "created at session setup time\n", service_in));
1102 return make_connection_smb1(sconn,
1103 vuser->homes_snum,
1104 vuser,
1105 dev, status);
1106 }
1107
1108 service = talloc_strdup(talloc_tos(), service_in);
1109 if (!service) {
1110 *status = NT_STATUS_NO_MEMORY;
1111 return NULL;
1112 }
1113
1114 if (!strlower_m(service)) {
1115 DEBUG(2, ("strlower_m %s failed\n", service));
1116 *status = NT_STATUS_INVALID_PARAMETER;
1117 return NULL;
1118 }
1119
1120 snum = find_service(talloc_tos(), service, &service);
1121 if (!service) {
1122 *status = NT_STATUS_NO_MEMORY;
1123 return NULL;
1124 }
1125
1126 if (snum < 0) {
1127 if (strequal(service,"IPC$") ||
1128 (lp_enable_asu_support() && strequal(service,"ADMIN$"))) {
1129 DEBUG(3,("refusing IPC connection to %s\n", service));
1130 *status = NT_STATUS_ACCESS_DENIED;
1131 return NULL;
1132 }
1133
1134 DEBUG(3,("%s (%s) couldn't find service %s\n",
1135 get_remote_machine_name(),
1136 tsocket_address_string(
1137 sconn->remote_address, talloc_tos()),
1138 service));
1139 *status = NT_STATUS_BAD_NETWORK_NAME;
1140 return NULL;
1141 }
1142
1143 /* Handle non-Dfs clients attempting connections to msdfs proxy */
1144 if (lp_host_msdfs() && (*lp_msdfs_proxy(talloc_tos(), snum) != '\0')) {
1145 DEBUG(3, ("refusing connection to dfs proxy share '%s' "
1146 "(pointing to %s)\n",
1147 service, lp_msdfs_proxy(talloc_tos(), snum)));
1148 *status = NT_STATUS_BAD_NETWORK_NAME;
1149 return NULL;
1150 }
1151
1152 DEBUG(5, ("making a connection to 'normal' service %s\n", service));
1153
1154 return make_connection_smb1(sconn, snum, vuser,
1155 dev, status);
1156 }
1157
1158 /****************************************************************************
1159 Close a cnum.
1160 ****************************************************************************/
1161
1162 void close_cnum(connection_struct *conn, uint64_t vuid)
1163 {
1164 file_close_conn(conn);
1165
1166 if (!IS_IPC(conn)) {
1167 dptr_closecnum(conn);
1168 }
1169
1170 change_to_root_user();
1171
1172 DEBUG(IS_IPC(conn)?3:1, ("%s (%s) closed connection to service %s\n",
1173 get_remote_machine_name(),
1174 tsocket_address_string(conn->sconn->remote_address,
1175 talloc_tos()),
1176 lp_servicename(talloc_tos(), SNUM(conn))));
1177
1178 /* Call VFS disconnect hook */
1179 SMB_VFS_DISCONNECT(conn);
1180
1181 yield_connection(conn, lp_servicename(talloc_tos(), SNUM(conn)));
1182
1183 /* make sure we leave the directory available for unmount */
1184 vfs_ChDir(conn, "/");
1185
1186 /* execute any "postexec = " line */
1187 if (*lp_postexec(talloc_tos(), SNUM(conn)) &&
1188 change_to_user(conn, vuid)) {
1189 char *cmd = talloc_sub_advanced(talloc_tos(),
1190 lp_servicename(talloc_tos(), SNUM(conn)),
1191 conn->session_info->unix_info->unix_name,
1192 conn->connectpath,
1193 conn->session_info->unix_token->gid,
1194 conn->session_info->unix_info->sanitized_username,
1195 conn->session_info->info->domain_name,
1196 lp_postexec(talloc_tos(), SNUM(conn)));
1197 smbrun(cmd,NULL);
1198 TALLOC_FREE(cmd);
1199 change_to_root_user();
1200 }
1201
1202 change_to_root_user();
1203 /* execute any "root postexec = " line */
1204 if (*lp_rootpostexec(talloc_tos(), SNUM(conn))) {
1205 char *cmd = talloc_sub_advanced(talloc_tos(),
1206 lp_servicename(talloc_tos(), SNUM(conn)),
1207 conn->session_info->unix_info->unix_name,
1208 conn->connectpath,
1209 conn->session_info->unix_token->gid,
1210 conn->session_info->unix_info->sanitized_username,
1211 conn->session_info->info->domain_name,
1212 lp_rootpostexec(talloc_tos(), SNUM(conn)));
1213 smbrun(cmd,NULL);
1214 TALLOC_FREE(cmd);
1215 }
1216
1217 conn_free(conn);
1218 }
reg import