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s3:libsmb: add cli_{query,set}_security_descriptor() which take sec_info flags
[Samba/gebeck_regimport.git] / source3 / smbd / service.c
blob2214ac0a2dd8657c22ec6dd870e7a112c3ac7bda
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 uid_t effuid;
563 gid_t effgid;
564 NTSTATUS status;
565
566 fstrcpy(dev, pdev);
567
568 status = share_sanity_checks(sconn->remote_address,
569 sconn->remote_hostname,
570 snum,
571 dev);
572 if (NT_STATUS_IS_ERR(status)) {
573 goto err_root_exit;
574 }
575
576 conn->params->service = snum;
577
578 status = create_connection_session_info(sconn,
579 conn, snum, vuser->session_info,
580 &conn->session_info);
581
582 if (!NT_STATUS_IS_OK(status)) {
583 DEBUG(1, ("create_connection_session_info failed: %s\n",
584 nt_errstr(status)));
585 goto err_root_exit;
586 }
587
588 if (lp_guest_only(snum)) {
589 conn->force_user = true;
590 }
591
592 conn->num_files_open = 0;
593 conn->lastused = conn->lastused_count = time(NULL);
594 conn->printer = (strncmp(dev,"LPT",3) == 0);
595 conn->ipc = ( (strncmp(dev,"IPC",3) == 0) ||
596 ( lp_enable_asu_support() && strequal(dev,"ADMIN$")) );
597
598 /* Case options for the share. */
599 if (lp_casesensitive(snum) == Auto) {
600 /* We will be setting this per packet. Set to be case
601 * insensitive for now. */
602 conn->case_sensitive = False;
603 } else {
604 conn->case_sensitive = (bool)lp_casesensitive(snum);
605 }
606
607 conn->case_preserve = lp_preservecase(snum);
608 conn->short_case_preserve = lp_shortpreservecase(snum);
609
610 conn->encrypt_level = lp_smb_encrypt(snum);
611
612 conn->veto_list = NULL;
613 conn->hide_list = NULL;
614 conn->veto_oplock_list = NULL;
615 conn->aio_write_behind_list = NULL;
616
617 conn->read_only = lp_readonly(SNUM(conn));
618
619 status = set_conn_force_user_group(conn, snum);
620 if (!NT_STATUS_IS_OK(status)) {
621 goto err_root_exit;
622 }
623
624 conn->vuid = vuser->vuid;
625
626 {
627 char *s = talloc_sub_advanced(talloc_tos(),
628 lp_servicename(talloc_tos(), SNUM(conn)),
629 conn->session_info->unix_info->unix_name,
630 conn->connectpath,
631 conn->session_info->unix_token->gid,
632 conn->session_info->unix_info->sanitized_username,
633 conn->session_info->info->domain_name,
634 lp_pathname(talloc_tos(), snum));
635 if (!s) {
636 status = NT_STATUS_NO_MEMORY;
637 goto err_root_exit;
638 }
639
640 if (!set_conn_connectpath(conn,s)) {
641 TALLOC_FREE(s);
642 status = NT_STATUS_NO_MEMORY;
643 goto err_root_exit;
644 }
645 DEBUG(3,("Connect path is '%s' for service [%s]\n",s,
646 lp_servicename(talloc_tos(), snum)));
647 TALLOC_FREE(s);
648 }
649
650 /*
651 * New code to check if there's a share security descripter
652 * added from NT server manager. This is done after the
653 * smb.conf checks are done as we need a uid and token. JRA.
654 *
655 */
656
657 create_share_access_mask(conn, snum);
658
659 if ((conn->share_access & FILE_WRITE_DATA) == 0) {
660 if ((conn->share_access & FILE_READ_DATA) == 0) {
661 /* No access, read or write. */
662 DEBUG(0,("make_connection: connection to %s "
663 "denied due to security "
664 "descriptor.\n",
665 lp_servicename(talloc_tos(), snum)));
666 status = NT_STATUS_ACCESS_DENIED;
667 goto err_root_exit;
668 } else {
669 conn->read_only = True;
670 }
671 }
672 /* Initialise VFS function pointers */
673
674 if (!smbd_vfs_init(conn)) {
675 DEBUG(0, ("vfs_init failed for service %s\n",
676 lp_servicename(talloc_tos(), snum)));
677 status = NT_STATUS_BAD_NETWORK_NAME;
678 goto err_root_exit;
679 }
680
681 /* ROOT Activities: */
682 /* explicitly check widelinks here so that we can correctly warn
683 * in the logs. */
684 widelinks_warning(snum);
685
686 /*
687 * Enforce the max connections parameter.
688 */
689
690 if ((lp_max_connections(snum) > 0)
691 && (count_current_connections(lp_servicename(talloc_tos(), SNUM(conn)), True) >=
692 lp_max_connections(snum))) {
693
694 DEBUG(1, ("Max connections (%d) exceeded for %s\n",
695 lp_max_connections(snum),
696 lp_servicename(talloc_tos(), snum)));
697 status = NT_STATUS_INSUFFICIENT_RESOURCES;
698 goto err_root_exit;
699 }
700
701 /* Invoke VFS make connection hook - this must be the first
702 filesystem operation that we do. */
703
704 if (SMB_VFS_CONNECT(conn, lp_servicename(talloc_tos(), snum),
705 conn->session_info->unix_info->unix_name) < 0) {
706 DEBUG(0,("make_connection: VFS make connection failed!\n"));
707 status = NT_STATUS_UNSUCCESSFUL;
708 goto err_root_exit;
709 }
710
711 /* Any error exit after here needs to call the disconnect hook. */
712 on_err_call_dis_hook = true;
713
714 if ((!conn->printer) && (!conn->ipc) &&
715 lp_change_notify(conn->params)) {
716 if (sconn->notify_ctx == NULL) {
717 sconn->notify_ctx = notify_init(
718 sconn, sconn->msg_ctx, sconn->ev_ctx);
719 }
720 if (sconn->sys_notify_ctx == NULL) {
721 sconn->sys_notify_ctx = sys_notify_context_create(
722 sconn, sconn->ev_ctx);
723 }
724 }
725
726 if (lp_kernel_oplocks(snum)) {
727 init_kernel_oplocks(conn->sconn);
728 }
729
730 /*
731 * Fix compatibility issue pointed out by Volker.
732 * We pass the conn->connectpath to the preexec
733 * scripts as a parameter, so attempt to canonicalize
734 * it here before calling the preexec scripts.
735 * We ignore errors here, as it is possible that
736 * the conn->connectpath doesn't exist yet and
737 * the preexec scripts will create them.
738 */
739
740 (void)canonicalize_connect_path(conn);
741
742 /* Preexecs are done here as they might make the dir we are to ChDir
743 * to below */
744 /* execute any "root preexec = " line */
745 if (*lp_rootpreexec(talloc_tos(), snum)) {
746 char *cmd = talloc_sub_advanced(talloc_tos(),
747 lp_servicename(talloc_tos(), SNUM(conn)),
748 conn->session_info->unix_info->unix_name,
749 conn->connectpath,
750 conn->session_info->unix_token->gid,
751 conn->session_info->unix_info->sanitized_username,
752 conn->session_info->info->domain_name,
753 lp_rootpreexec(talloc_tos(), snum));
754 DEBUG(5,("cmd=%s\n",cmd));
755 ret = smbrun(cmd,NULL);
756 TALLOC_FREE(cmd);
757 if (ret != 0 && lp_rootpreexec_close(snum)) {
758 DEBUG(1,("root preexec gave %d - failing "
759 "connection\n", ret));
760 status = NT_STATUS_ACCESS_DENIED;
761 goto err_root_exit;
762 }
763 }
764
765 /* USER Activites: */
766 if (!change_to_user(conn, conn->vuid)) {
767 /* No point continuing if they fail the basic checks */
768 DEBUG(0,("Can't become connected user!\n"));
769 status = NT_STATUS_LOGON_FAILURE;
770 goto err_root_exit;
771 }
772
773 effuid = geteuid();
774 effgid = getegid();
775
776 /* Remember that a different vuid can connect later without these
777 * checks... */
778
779 /* Preexecs are done here as they might make the dir we are to ChDir
780 * to below */
781
782 /* execute any "preexec = " line */
783 if (*lp_preexec(talloc_tos(), snum)) {
784 char *cmd = talloc_sub_advanced(talloc_tos(),
785 lp_servicename(talloc_tos(), SNUM(conn)),
786 conn->session_info->unix_info->unix_name,
787 conn->connectpath,
788 conn->session_info->unix_token->gid,
789 conn->session_info->unix_info->sanitized_username,
790 conn->session_info->info->domain_name,
791 lp_preexec(talloc_tos(), snum));
792 ret = smbrun(cmd,NULL);
793 TALLOC_FREE(cmd);
794 if (ret != 0 && lp_preexec_close(snum)) {
795 DEBUG(1,("preexec gave %d - failing connection\n",
796 ret));
797 status = NT_STATUS_ACCESS_DENIED;
798 goto err_root_exit;
799 }
800 }
801
802 #ifdef WITH_FAKE_KASERVER
803 if (lp_afs_share(snum)) {
804 afs_login(conn);
805 }
806 #endif
807
808 /*
809 * we've finished with the user stuff - go back to root
810 * so the SMB_VFS_STAT call will only fail on path errors,
811 * not permission problems.
812 */
813 change_to_root_user();
814 /* ROOT Activites: */
815
816 /*
817 * If widelinks are disallowed we need to canonicalise the connect
818 * path here to ensure we don't have any symlinks in the
819 * connectpath. We will be checking all paths on this connection are
820 * below this directory. We must do this after the VFS init as we
821 * depend on the realpath() pointer in the vfs table. JRA.
822 */
823 if (!lp_widelinks(snum)) {
824 if (!canonicalize_connect_path(conn)) {
825 DEBUG(0, ("canonicalize_connect_path failed "
826 "for service %s, path %s\n",
827 lp_servicename(talloc_tos(), snum),
828 conn->connectpath));
829 status = NT_STATUS_BAD_NETWORK_NAME;
830 goto err_root_exit;
831 }
832 }
833
834 /* Add veto/hide lists */
835 if (!IS_IPC(conn) && !IS_PRINT(conn)) {
836 set_namearray( &conn->veto_list,
837 lp_veto_files(talloc_tos(), snum));
838 set_namearray( &conn->hide_list,
839 lp_hide_files(talloc_tos(), snum));
840 set_namearray( &conn->veto_oplock_list,
841 lp_veto_oplocks(talloc_tos(), snum));
842 set_namearray( &conn->aio_write_behind_list,
843 lp_aio_write_behind(talloc_tos(), snum));
844 }
845 status = create_synthetic_smb_fname(talloc_tos(), conn->connectpath,
846 NULL, NULL, &smb_fname_cpath);
847 if (!NT_STATUS_IS_OK(status)) {
848 goto err_root_exit;
849 }
850
851 /* win2000 does not check the permissions on the directory
852 during the tree connect, instead relying on permission
853 check during individual operations. To match this behaviour
854 I have disabled this chdir check (tridge) */
855 /* the alternative is just to check the directory exists */
856
857 if ((ret = SMB_VFS_STAT(conn, smb_fname_cpath)) != 0 ||
858 !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
859 if (ret == 0 && !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
860 DEBUG(0,("'%s' is not a directory, when connecting to "
861 "[%s]\n", conn->connectpath,
862 lp_servicename(talloc_tos(), snum)));
863 } else {
864 DEBUG(0,("'%s' does not exist or permission denied "
865 "when connecting to [%s] Error was %s\n",
866 conn->connectpath,
867 lp_servicename(talloc_tos(), snum),
868 strerror(errno) ));
869 }
870 status = NT_STATUS_BAD_NETWORK_NAME;
871 goto err_root_exit;
872 }
873 conn->base_share_dev = smb_fname_cpath->st.st_ex_dev;
874
875 talloc_free(conn->origpath);
876 conn->origpath = talloc_strdup(conn, conn->connectpath);
877
878 /* Figure out the characteristics of the underlying filesystem. This
879 * assumes that all the filesystem mounted withing a share path have
880 * the same characteristics, which is likely but not guaranteed.
881 */
882
883 conn->fs_capabilities = SMB_VFS_FS_CAPABILITIES(conn, &conn->ts_res);
884
885 /*
886 * Print out the 'connected as' stuff here as we need
887 * to know the effective uid and gid we will be using
888 * (at least initially).
889 */
890
891 if( DEBUGLVL( IS_IPC(conn) ? 3 : 1 ) ) {
892 dbgtext( "%s (%s) ", get_remote_machine_name(),
893 tsocket_address_string(conn->sconn->remote_address,
894 talloc_tos()) );
895 dbgtext( "%s", srv_is_signing_active(sconn) ? "signed " : "");
896 dbgtext( "connect to service %s ",
897 lp_servicename(talloc_tos(), snum) );
898 dbgtext( "initially as user %s ",
899 conn->session_info->unix_info->unix_name );
900 dbgtext( "(uid=%d, gid=%d) ", (int)effuid, (int)effgid );
901 dbgtext( "(pid %d)\n", (int)getpid() );
902 }
903
904 return status;
905
906 err_root_exit:
907
908 TALLOC_FREE(smb_fname_cpath);
909 /* We must exit this function as root. */
910 if (geteuid() != 0) {
911 change_to_root_user();
912 }
913 if (on_err_call_dis_hook) {
914 /* Call VFS disconnect hook */
915 SMB_VFS_DISCONNECT(conn);
916 }
917 return status;
918 }
919
920 /****************************************************************************
921 Make a connection to a service from SMB1. Internal interface.
922 ****************************************************************************/
923
924 static connection_struct *make_connection_smb1(struct smbd_server_connection *sconn,
925 NTTIME now,
926 int snum, struct user_struct *vuser,
927 const char *pdev,
928 NTSTATUS *pstatus)
929 {
930 struct smbXsrv_tcon *tcon;
931 NTSTATUS status;
932 struct connection_struct *conn;
933
934 status = smb1srv_tcon_create(sconn->conn, now, &tcon);
935 if (!NT_STATUS_IS_OK(status)) {
936 DEBUG(0,("make_connection_smb1: Couldn't find free tcon %s.\n",
937 nt_errstr(status)));
938 *pstatus = status;
939 return NULL;
940 }
941
942 conn = conn_new(sconn);
943 if (!conn) {
944 TALLOC_FREE(tcon);
945
946 DEBUG(0,("make_connection_smb1: Couldn't find free connection.\n"));
947 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
948 return NULL;
949 }
950
951 conn->cnum = tcon->global->tcon_wire_id;
952 conn->tcon = tcon;
953
954 *pstatus = make_connection_snum(sconn,
955 conn,
956 snum,
957 vuser,
958 pdev);
959 if (!NT_STATUS_IS_OK(*pstatus)) {
960 conn_free(conn);
961 TALLOC_FREE(tcon);
962 return NULL;
963 }
964
965 tcon->global->share_name = lp_servicename(tcon->global, SNUM(conn));
966 if (tcon->global->share_name == NULL) {
967 conn_free(conn);
968 TALLOC_FREE(tcon);
969 *pstatus = NT_STATUS_NO_MEMORY;
970 return NULL;
971 }
972 tcon->global->session_global_id =
973 vuser->session->global->session_global_id;
974
975 tcon->compat = talloc_move(tcon, &conn);
976 tcon->status = NT_STATUS_OK;
977
978 *pstatus = smbXsrv_tcon_update(tcon);
979 if (!NT_STATUS_IS_OK(*pstatus)) {
980 TALLOC_FREE(tcon);
981 return NULL;
982 }
983
984 return tcon->compat;
985 }
986
987 /****************************************************************************
988 Make a connection to a service from SMB2. External SMB2 interface.
989 We must set cnum before claiming connection.
990 ****************************************************************************/
991
992 connection_struct *make_connection_smb2(struct smbd_server_connection *sconn,
993 struct smbXsrv_tcon *tcon,
994 int snum,
995 struct user_struct *vuser,
996 const char *pdev,
997 NTSTATUS *pstatus)
998 {
999 connection_struct *conn = conn_new(sconn);
1000 if (!conn) {
1001 DEBUG(0,("make_connection_smb2: Couldn't find free connection.\n"));
1002 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
1003 return NULL;
1004 }
1005
1006 conn->cnum = tcon->global->tcon_wire_id;
1007 conn->tcon = tcon;
1008
1009 *pstatus = make_connection_snum(sconn,
1010 conn,
1011 snum,
1012 vuser,
1013 pdev);
1014 if (!NT_STATUS_IS_OK(*pstatus)) {
1015 conn_free(conn);
1016 return NULL;
1017 }
1018 return conn;
1019 }
1020
1021 /****************************************************************************
1022 Make a connection to a service. External SMB1 interface.
1023 *
1024 * @param service
1025 ****************************************************************************/
1026
1027 connection_struct *make_connection(struct smbd_server_connection *sconn,
1028 NTTIME now,
1029 const char *service_in,
1030 const char *pdev, uint64_t vuid,
1031 NTSTATUS *status)
1032 {
1033 uid_t euid;
1034 struct user_struct *vuser = NULL;
1035 char *service = NULL;
1036 fstring dev;
1037 int snum = -1;
1038
1039 fstrcpy(dev, pdev);
1040
1041 /* This must ONLY BE CALLED AS ROOT. As it exits this function as
1042 * root. */
1043 if (!non_root_mode() && (euid = geteuid()) != 0) {
1044 DEBUG(0,("make_connection: PANIC ERROR. Called as nonroot "
1045 "(%u)\n", (unsigned int)euid ));
1046 smb_panic("make_connection: PANIC ERROR. Called as nonroot\n");
1047 }
1048
1049 if (conn_num_open(sconn) > 2047) {
1050 *status = NT_STATUS_INSUFF_SERVER_RESOURCES;
1051 return NULL;
1052 }
1053
1054 vuser = get_valid_user_struct(sconn, vuid);
1055 if (!vuser) {
1056 DEBUG(1,("make_connection: refusing to connect with "
1057 "no session setup\n"));
1058 *status = NT_STATUS_ACCESS_DENIED;
1059 return NULL;
1060 }
1061
1062 /* Logic to try and connect to the correct [homes] share, preferably
1063 without too many getpwnam() lookups. This is particulary nasty for
1064 winbind usernames, where the share name isn't the same as unix
1065 username.
1066
1067 The snum of the homes share is stored on the vuser at session setup
1068 time.
1069 */
1070
1071 if (strequal(service_in,HOMES_NAME)) {
1072 if (vuser->homes_snum == -1) {
1073 DEBUG(2, ("[homes] share not available for "
1074 "this user because it was not found "
1075 "or created at session setup "
1076 "time\n"));
1077 *status = NT_STATUS_BAD_NETWORK_NAME;
1078 return NULL;
1079 }
1080 DEBUG(5, ("making a connection to [homes] service "
1081 "created at session setup time\n"));
1082 return make_connection_smb1(sconn, now,
1083 vuser->homes_snum,
1084 vuser,
1085 dev, status);
1086 } else if ((vuser->homes_snum != -1)
1087 && strequal(service_in,
1088 lp_servicename(talloc_tos(), vuser->homes_snum))) {
1089 DEBUG(5, ("making a connection to 'homes' service [%s] "
1090 "created at session setup time\n", service_in));
1091 return make_connection_smb1(sconn, now,
1092 vuser->homes_snum,
1093 vuser,
1094 dev, status);
1095 }
1096
1097 service = talloc_strdup(talloc_tos(), service_in);
1098 if (!service) {
1099 *status = NT_STATUS_NO_MEMORY;
1100 return NULL;
1101 }
1102
1103 if (!strlower_m(service)) {
1104 DEBUG(2, ("strlower_m %s failed\n", service));
1105 *status = NT_STATUS_INVALID_PARAMETER;
1106 return NULL;
1107 }
1108
1109 snum = find_service(talloc_tos(), service, &service);
1110 if (!service) {
1111 *status = NT_STATUS_NO_MEMORY;
1112 return NULL;
1113 }
1114
1115 if (snum < 0) {
1116 if (strequal(service,"IPC$") ||
1117 (lp_enable_asu_support() && strequal(service,"ADMIN$"))) {
1118 DEBUG(3,("refusing IPC connection to %s\n", service));
1119 *status = NT_STATUS_ACCESS_DENIED;
1120 return NULL;
1121 }
1122
1123 DEBUG(3,("%s (%s) couldn't find service %s\n",
1124 get_remote_machine_name(),
1125 tsocket_address_string(
1126 sconn->remote_address, talloc_tos()),
1127 service));
1128 *status = NT_STATUS_BAD_NETWORK_NAME;
1129 return NULL;
1130 }
1131
1132 /* Handle non-Dfs clients attempting connections to msdfs proxy */
1133 if (lp_host_msdfs() && (*lp_msdfs_proxy(talloc_tos(), snum) != '\0')) {
1134 DEBUG(3, ("refusing connection to dfs proxy share '%s' "
1135 "(pointing to %s)\n",
1136 service, lp_msdfs_proxy(talloc_tos(), snum)));
1137 *status = NT_STATUS_BAD_NETWORK_NAME;
1138 return NULL;
1139 }
1140
1141 DEBUG(5, ("making a connection to 'normal' service %s\n", service));
1142
1143 return make_connection_smb1(sconn, now, snum, vuser,
1144 dev, status);
1145 }
1146
1147 /****************************************************************************
1148 Close a cnum.
1149 ****************************************************************************/
1150
1151 void close_cnum(connection_struct *conn, uint64_t vuid)
1152 {
1153 file_close_conn(conn);
1154
1155 if (!IS_IPC(conn)) {
1156 dptr_closecnum(conn);
1157 }
1158
1159 change_to_root_user();
1160
1161 DEBUG(IS_IPC(conn)?3:1, ("%s (%s) closed connection to service %s\n",
1162 get_remote_machine_name(),
1163 tsocket_address_string(conn->sconn->remote_address,
1164 talloc_tos()),
1165 lp_servicename(talloc_tos(), SNUM(conn))));
1166
1167 /* Call VFS disconnect hook */
1168 SMB_VFS_DISCONNECT(conn);
1169
1170 /* make sure we leave the directory available for unmount */
1171 vfs_ChDir(conn, "/");
1172
1173 /* execute any "postexec = " line */
1174 if (*lp_postexec(talloc_tos(), SNUM(conn)) &&
1175 change_to_user(conn, vuid)) {
1176 char *cmd = talloc_sub_advanced(talloc_tos(),
1177 lp_servicename(talloc_tos(), SNUM(conn)),
1178 conn->session_info->unix_info->unix_name,
1179 conn->connectpath,
1180 conn->session_info->unix_token->gid,
1181 conn->session_info->unix_info->sanitized_username,
1182 conn->session_info->info->domain_name,
1183 lp_postexec(talloc_tos(), SNUM(conn)));
1184 smbrun(cmd,NULL);
1185 TALLOC_FREE(cmd);
1186 change_to_root_user();
1187 }
1188
1189 change_to_root_user();
1190 /* execute any "root postexec = " line */
1191 if (*lp_rootpostexec(talloc_tos(), SNUM(conn))) {
1192 char *cmd = talloc_sub_advanced(talloc_tos(),
1193 lp_servicename(talloc_tos(), SNUM(conn)),
1194 conn->session_info->unix_info->unix_name,
1195 conn->connectpath,
1196 conn->session_info->unix_token->gid,
1197 conn->session_info->unix_info->sanitized_username,
1198 conn->session_info->info->domain_name,
1199 lp_rootpostexec(talloc_tos(), SNUM(conn)));
1200 smbrun(cmd,NULL);
1201 TALLOC_FREE(cmd);
1202 }
1203
1204 conn_free(conn);
1205 }
reg import