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librpc: Shorten dcerpc_binding_handle_call a bit
[Samba/gebeck_regimport.git] / source3 / smbd / service.c
bloba7464f0722c5011c44ccb3c845a6e7ad54cf6da9
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 Make a connection, given the snum to connect to, and the vuser of the
516 connecting user if appropriate.
517 ****************************************************************************/
518
519 static NTSTATUS make_connection_snum(struct smbd_server_connection *sconn,
520 connection_struct *conn,
521 int snum, struct user_struct *vuser,
522 const char *pdev)
523 {
524 struct smb_filename *smb_fname_cpath = NULL;
525 fstring dev;
526 int ret;
527 bool on_err_call_dis_hook = false;
528 uid_t effuid;
529 gid_t effgid;
530 NTSTATUS status;
531
532 fstrcpy(dev, pdev);
533
534 status = share_sanity_checks(sconn->remote_address,
535 sconn->remote_hostname,
536 snum,
537 dev);
538 if (NT_STATUS_IS_ERR(status)) {
539 goto err_root_exit;
540 }
541
542 conn->params->service = snum;
543
544 status = create_connection_session_info(sconn,
545 conn, snum, vuser->session_info,
546 &conn->session_info);
547
548 if (!NT_STATUS_IS_OK(status)) {
549 DEBUG(1, ("create_connection_session_info failed: %s\n",
550 nt_errstr(status)));
551 goto err_root_exit;
552 }
553
554 if (lp_guest_only(snum)) {
555 conn->force_user = true;
556 }
557
558 conn->num_files_open = 0;
559 conn->lastused = conn->lastused_count = time(NULL);
560 conn->printer = (strncmp(dev,"LPT",3) == 0);
561 conn->ipc = ( (strncmp(dev,"IPC",3) == 0) ||
562 ( lp_enable_asu_support() && strequal(dev,"ADMIN$")) );
563
564 /* Case options for the share. */
565 if (lp_casesensitive(snum) == Auto) {
566 /* We will be setting this per packet. Set to be case
567 * insensitive for now. */
568 conn->case_sensitive = False;
569 } else {
570 conn->case_sensitive = (bool)lp_casesensitive(snum);
571 }
572
573 conn->case_preserve = lp_preservecase(snum);
574 conn->short_case_preserve = lp_shortpreservecase(snum);
575
576 conn->encrypt_level = lp_smb_encrypt(snum);
577
578 conn->veto_list = NULL;
579 conn->hide_list = NULL;
580 conn->veto_oplock_list = NULL;
581 conn->aio_write_behind_list = NULL;
582
583 conn->read_only = lp_readonly(SNUM(conn));
584
585 status = set_conn_force_user_group(conn, snum);
586 if (!NT_STATUS_IS_OK(status)) {
587 goto err_root_exit;
588 }
589
590 conn->vuid = vuser->vuid;
591
592 {
593 char *s = talloc_sub_advanced(talloc_tos(),
594 lp_servicename(talloc_tos(), SNUM(conn)),
595 conn->session_info->unix_info->unix_name,
596 conn->connectpath,
597 conn->session_info->unix_token->gid,
598 conn->session_info->unix_info->sanitized_username,
599 conn->session_info->info->domain_name,
600 lp_pathname(talloc_tos(), snum));
601 if (!s) {
602 status = NT_STATUS_NO_MEMORY;
603 goto err_root_exit;
604 }
605
606 if (!set_conn_connectpath(conn,s)) {
607 TALLOC_FREE(s);
608 status = NT_STATUS_NO_MEMORY;
609 goto err_root_exit;
610 }
611 DEBUG(3,("Connect path is '%s' for service [%s]\n",s,
612 lp_servicename(talloc_tos(), snum)));
613 TALLOC_FREE(s);
614 }
615
616 /*
617 * Set up the share security descriptor
618 */
619
620 status = check_user_share_access(conn,
621 conn->session_info,
622 &conn->share_access,
623 &conn->read_only);
624 if (!NT_STATUS_IS_OK(status)) {
625 goto err_root_exit;
626 }
627
628 /* Initialise VFS function pointers */
629
630 if (!smbd_vfs_init(conn)) {
631 DEBUG(0, ("vfs_init failed for service %s\n",
632 lp_servicename(talloc_tos(), snum)));
633 status = NT_STATUS_BAD_NETWORK_NAME;
634 goto err_root_exit;
635 }
636
637 /* ROOT Activities: */
638 /* explicitly check widelinks here so that we can correctly warn
639 * in the logs. */
640 widelinks_warning(snum);
641
642 /*
643 * Enforce the max connections parameter.
644 */
645
646 if ((lp_max_connections(snum) > 0)
647 && (count_current_connections(lp_servicename(talloc_tos(), SNUM(conn)), True) >=
648 lp_max_connections(snum))) {
649
650 DEBUG(1, ("Max connections (%d) exceeded for %s\n",
651 lp_max_connections(snum),
652 lp_servicename(talloc_tos(), snum)));
653 status = NT_STATUS_INSUFFICIENT_RESOURCES;
654 goto err_root_exit;
655 }
656
657 /* Invoke VFS make connection hook - this must be the first
658 filesystem operation that we do. */
659
660 if (SMB_VFS_CONNECT(conn, lp_servicename(talloc_tos(), snum),
661 conn->session_info->unix_info->unix_name) < 0) {
662 DEBUG(0,("make_connection: VFS make connection failed!\n"));
663 status = NT_STATUS_UNSUCCESSFUL;
664 goto err_root_exit;
665 }
666
667 /* Any error exit after here needs to call the disconnect hook. */
668 on_err_call_dis_hook = true;
669
670 if ((!conn->printer) && (!conn->ipc) &&
671 lp_change_notify(conn->params)) {
672 if (sconn->notify_ctx == NULL) {
673 sconn->notify_ctx = notify_init(
674 sconn, sconn->msg_ctx, sconn->ev_ctx);
675 }
676 if (sconn->sys_notify_ctx == NULL) {
677 sconn->sys_notify_ctx = sys_notify_context_create(
678 sconn, sconn->ev_ctx);
679 }
680 }
681
682 if (lp_kernel_oplocks(snum)) {
683 init_kernel_oplocks(conn->sconn);
684 }
685
686 /*
687 * Fix compatibility issue pointed out by Volker.
688 * We pass the conn->connectpath to the preexec
689 * scripts as a parameter, so attempt to canonicalize
690 * it here before calling the preexec scripts.
691 * We ignore errors here, as it is possible that
692 * the conn->connectpath doesn't exist yet and
693 * the preexec scripts will create them.
694 */
695
696 (void)canonicalize_connect_path(conn);
697
698 /* Preexecs are done here as they might make the dir we are to ChDir
699 * to below */
700 /* execute any "root preexec = " line */
701 if (*lp_rootpreexec(talloc_tos(), snum)) {
702 char *cmd = talloc_sub_advanced(talloc_tos(),
703 lp_servicename(talloc_tos(), SNUM(conn)),
704 conn->session_info->unix_info->unix_name,
705 conn->connectpath,
706 conn->session_info->unix_token->gid,
707 conn->session_info->unix_info->sanitized_username,
708 conn->session_info->info->domain_name,
709 lp_rootpreexec(talloc_tos(), snum));
710 DEBUG(5,("cmd=%s\n",cmd));
711 ret = smbrun(cmd,NULL);
712 TALLOC_FREE(cmd);
713 if (ret != 0 && lp_rootpreexec_close(snum)) {
714 DEBUG(1,("root preexec gave %d - failing "
715 "connection\n", ret));
716 status = NT_STATUS_ACCESS_DENIED;
717 goto err_root_exit;
718 }
719 }
720
721 /* USER Activites: */
722 if (!change_to_user(conn, conn->vuid)) {
723 /* No point continuing if they fail the basic checks */
724 DEBUG(0,("Can't become connected user!\n"));
725 status = NT_STATUS_LOGON_FAILURE;
726 goto err_root_exit;
727 }
728
729 effuid = geteuid();
730 effgid = getegid();
731
732 /* Remember that a different vuid can connect later without these
733 * checks... */
734
735 /* Preexecs are done here as they might make the dir we are to ChDir
736 * to below */
737
738 /* execute any "preexec = " line */
739 if (*lp_preexec(talloc_tos(), snum)) {
740 char *cmd = talloc_sub_advanced(talloc_tos(),
741 lp_servicename(talloc_tos(), SNUM(conn)),
742 conn->session_info->unix_info->unix_name,
743 conn->connectpath,
744 conn->session_info->unix_token->gid,
745 conn->session_info->unix_info->sanitized_username,
746 conn->session_info->info->domain_name,
747 lp_preexec(talloc_tos(), snum));
748 ret = smbrun(cmd,NULL);
749 TALLOC_FREE(cmd);
750 if (ret != 0 && lp_preexec_close(snum)) {
751 DEBUG(1,("preexec gave %d - failing connection\n",
752 ret));
753 status = NT_STATUS_ACCESS_DENIED;
754 goto err_root_exit;
755 }
756 }
757
758 #ifdef WITH_FAKE_KASERVER
759 if (lp_afs_share(snum)) {
760 afs_login(conn);
761 }
762 #endif
763
764 /*
765 * we've finished with the user stuff - go back to root
766 * so the SMB_VFS_STAT call will only fail on path errors,
767 * not permission problems.
768 */
769 change_to_root_user();
770 /* ROOT Activites: */
771
772 /*
773 * If widelinks are disallowed we need to canonicalise the connect
774 * path here to ensure we don't have any symlinks in the
775 * connectpath. We will be checking all paths on this connection are
776 * below this directory. We must do this after the VFS init as we
777 * depend on the realpath() pointer in the vfs table. JRA.
778 */
779 if (!lp_widelinks(snum)) {
780 if (!canonicalize_connect_path(conn)) {
781 DEBUG(0, ("canonicalize_connect_path failed "
782 "for service %s, path %s\n",
783 lp_servicename(talloc_tos(), snum),
784 conn->connectpath));
785 status = NT_STATUS_BAD_NETWORK_NAME;
786 goto err_root_exit;
787 }
788 }
789
790 /* Add veto/hide lists */
791 if (!IS_IPC(conn) && !IS_PRINT(conn)) {
792 set_namearray( &conn->veto_list,
793 lp_veto_files(talloc_tos(), snum));
794 set_namearray( &conn->hide_list,
795 lp_hide_files(talloc_tos(), snum));
796 set_namearray( &conn->veto_oplock_list,
797 lp_veto_oplocks(talloc_tos(), snum));
798 set_namearray( &conn->aio_write_behind_list,
799 lp_aio_write_behind(talloc_tos(), snum));
800 }
801 smb_fname_cpath = synthetic_smb_fname(talloc_tos(), conn->connectpath,
802 NULL, NULL);
803 if (smb_fname_cpath == NULL) {
804 status = NT_STATUS_NO_MEMORY;
805 goto err_root_exit;
806 }
807
808 /* win2000 does not check the permissions on the directory
809 during the tree connect, instead relying on permission
810 check during individual operations. To match this behaviour
811 I have disabled this chdir check (tridge) */
812 /* the alternative is just to check the directory exists */
813
814 if ((ret = SMB_VFS_STAT(conn, smb_fname_cpath)) != 0 ||
815 !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
816 if (ret == 0 && !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
817 DEBUG(0,("'%s' is not a directory, when connecting to "
818 "[%s]\n", conn->connectpath,
819 lp_servicename(talloc_tos(), snum)));
820 } else {
821 DEBUG(0,("'%s' does not exist or permission denied "
822 "when connecting to [%s] Error was %s\n",
823 conn->connectpath,
824 lp_servicename(talloc_tos(), snum),
825 strerror(errno) ));
826 }
827 status = NT_STATUS_BAD_NETWORK_NAME;
828 goto err_root_exit;
829 }
830 conn->base_share_dev = smb_fname_cpath->st.st_ex_dev;
831
832 talloc_free(conn->origpath);
833 conn->origpath = talloc_strdup(conn, conn->connectpath);
834
835 /* Figure out the characteristics of the underlying filesystem. This
836 * assumes that all the filesystem mounted withing a share path have
837 * the same characteristics, which is likely but not guaranteed.
838 */
839
840 conn->fs_capabilities = SMB_VFS_FS_CAPABILITIES(conn, &conn->ts_res);
841
842 /*
843 * Print out the 'connected as' stuff here as we need
844 * to know the effective uid and gid we will be using
845 * (at least initially).
846 */
847
848 if( DEBUGLVL( IS_IPC(conn) ? 3 : 2 ) ) {
849 dbgtext( "%s (%s) ", get_remote_machine_name(),
850 tsocket_address_string(conn->sconn->remote_address,
851 talloc_tos()) );
852 dbgtext( "%s", srv_is_signing_active(sconn) ? "signed " : "");
853 dbgtext( "connect to service %s ",
854 lp_servicename(talloc_tos(), snum) );
855 dbgtext( "initially as user %s ",
856 conn->session_info->unix_info->unix_name );
857 dbgtext( "(uid=%d, gid=%d) ", (int)effuid, (int)effgid );
858 dbgtext( "(pid %d)\n", (int)getpid() );
859 }
860
861 return status;
862
863 err_root_exit:
864
865 TALLOC_FREE(smb_fname_cpath);
866 /* We must exit this function as root. */
867 if (geteuid() != 0) {
868 change_to_root_user();
869 }
870 if (on_err_call_dis_hook) {
871 /* Call VFS disconnect hook */
872 SMB_VFS_DISCONNECT(conn);
873 }
874 return status;
875 }
876
877 /****************************************************************************
878 Make a connection to a service from SMB1. Internal interface.
879 ****************************************************************************/
880
881 static connection_struct *make_connection_smb1(struct smbd_server_connection *sconn,
882 NTTIME now,
883 int snum, struct user_struct *vuser,
884 const char *pdev,
885 NTSTATUS *pstatus)
886 {
887 struct smbXsrv_tcon *tcon;
888 NTSTATUS status;
889 struct connection_struct *conn;
890
891 status = smb1srv_tcon_create(sconn->conn, now, &tcon);
892 if (!NT_STATUS_IS_OK(status)) {
893 DEBUG(0,("make_connection_smb1: Couldn't find free tcon %s.\n",
894 nt_errstr(status)));
895 *pstatus = status;
896 return NULL;
897 }
898
899 conn = conn_new(sconn);
900 if (!conn) {
901 TALLOC_FREE(tcon);
902
903 DEBUG(0,("make_connection_smb1: Couldn't find free connection.\n"));
904 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
905 return NULL;
906 }
907
908 conn->cnum = tcon->global->tcon_wire_id;
909 conn->tcon = tcon;
910
911 *pstatus = make_connection_snum(sconn,
912 conn,
913 snum,
914 vuser,
915 pdev);
916 if (!NT_STATUS_IS_OK(*pstatus)) {
917 conn_free(conn);
918 TALLOC_FREE(tcon);
919 return NULL;
920 }
921
922 tcon->global->share_name = lp_servicename(tcon->global, SNUM(conn));
923 if (tcon->global->share_name == NULL) {
924 conn_free(conn);
925 TALLOC_FREE(tcon);
926 *pstatus = NT_STATUS_NO_MEMORY;
927 return NULL;
928 }
929 tcon->global->session_global_id =
930 vuser->session->global->session_global_id;
931
932 tcon->compat = talloc_move(tcon, &conn);
933 tcon->status = NT_STATUS_OK;
934
935 *pstatus = smbXsrv_tcon_update(tcon);
936 if (!NT_STATUS_IS_OK(*pstatus)) {
937 TALLOC_FREE(tcon);
938 return NULL;
939 }
940
941 return tcon->compat;
942 }
943
944 /****************************************************************************
945 Make a connection to a service from SMB2. External SMB2 interface.
946 We must set cnum before claiming connection.
947 ****************************************************************************/
948
949 connection_struct *make_connection_smb2(struct smbd_server_connection *sconn,
950 struct smbXsrv_tcon *tcon,
951 int snum,
952 struct user_struct *vuser,
953 const char *pdev,
954 NTSTATUS *pstatus)
955 {
956 connection_struct *conn = conn_new(sconn);
957 if (!conn) {
958 DEBUG(0,("make_connection_smb2: Couldn't find free connection.\n"));
959 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
960 return NULL;
961 }
962
963 conn->cnum = tcon->global->tcon_wire_id;
964 conn->tcon = tcon;
965
966 *pstatus = make_connection_snum(sconn,
967 conn,
968 snum,
969 vuser,
970 pdev);
971 if (!NT_STATUS_IS_OK(*pstatus)) {
972 conn_free(conn);
973 return NULL;
974 }
975 return conn;
976 }
977
978 /****************************************************************************
979 Make a connection to a service. External SMB1 interface.
980 *
981 * @param service
982 ****************************************************************************/
983
984 connection_struct *make_connection(struct smbd_server_connection *sconn,
985 NTTIME now,
986 const char *service_in,
987 const char *pdev, uint64_t vuid,
988 NTSTATUS *status)
989 {
990 uid_t euid;
991 struct user_struct *vuser = NULL;
992 char *service = NULL;
993 fstring dev;
994 int snum = -1;
995
996 fstrcpy(dev, pdev);
997
998 /* This must ONLY BE CALLED AS ROOT. As it exits this function as
999 * root. */
1000 if (!non_root_mode() && (euid = geteuid()) != 0) {
1001 DEBUG(0,("make_connection: PANIC ERROR. Called as nonroot "
1002 "(%u)\n", (unsigned int)euid ));
1003 smb_panic("make_connection: PANIC ERROR. Called as nonroot\n");
1004 }
1005
1006 if (conn_num_open(sconn) > 2047) {
1007 *status = NT_STATUS_INSUFF_SERVER_RESOURCES;
1008 return NULL;
1009 }
1010
1011 vuser = get_valid_user_struct(sconn, vuid);
1012 if (!vuser) {
1013 DEBUG(1,("make_connection: refusing to connect with "
1014 "no session setup\n"));
1015 *status = NT_STATUS_ACCESS_DENIED;
1016 return NULL;
1017 }
1018
1019 /* Logic to try and connect to the correct [homes] share, preferably
1020 without too many getpwnam() lookups. This is particulary nasty for
1021 winbind usernames, where the share name isn't the same as unix
1022 username.
1023
1024 The snum of the homes share is stored on the vuser at session setup
1025 time.
1026 */
1027
1028 if (strequal(service_in,HOMES_NAME)) {
1029 if (vuser->homes_snum == -1) {
1030 DEBUG(2, ("[homes] share not available for "
1031 "this user because it was not found "
1032 "or created at session setup "
1033 "time\n"));
1034 *status = NT_STATUS_BAD_NETWORK_NAME;
1035 return NULL;
1036 }
1037 DEBUG(5, ("making a connection to [homes] service "
1038 "created at session setup time\n"));
1039 return make_connection_smb1(sconn, now,
1040 vuser->homes_snum,
1041 vuser,
1042 dev, status);
1043 } else if ((vuser->homes_snum != -1)
1044 && strequal(service_in,
1045 lp_servicename(talloc_tos(), vuser->homes_snum))) {
1046 DEBUG(5, ("making a connection to 'homes' service [%s] "
1047 "created at session setup time\n", service_in));
1048 return make_connection_smb1(sconn, now,
1049 vuser->homes_snum,
1050 vuser,
1051 dev, status);
1052 }
1053
1054 service = talloc_strdup(talloc_tos(), service_in);
1055 if (!service) {
1056 *status = NT_STATUS_NO_MEMORY;
1057 return NULL;
1058 }
1059
1060 if (!strlower_m(service)) {
1061 DEBUG(2, ("strlower_m %s failed\n", service));
1062 *status = NT_STATUS_INVALID_PARAMETER;
1063 return NULL;
1064 }
1065
1066 snum = find_service(talloc_tos(), service, &service);
1067 if (!service) {
1068 *status = NT_STATUS_NO_MEMORY;
1069 return NULL;
1070 }
1071
1072 if (snum < 0) {
1073 if (strequal(service,"IPC$") ||
1074 (lp_enable_asu_support() && strequal(service,"ADMIN$"))) {
1075 DEBUG(3,("refusing IPC connection to %s\n", service));
1076 *status = NT_STATUS_ACCESS_DENIED;
1077 return NULL;
1078 }
1079
1080 DEBUG(3,("%s (%s) couldn't find service %s\n",
1081 get_remote_machine_name(),
1082 tsocket_address_string(
1083 sconn->remote_address, talloc_tos()),
1084 service));
1085 *status = NT_STATUS_BAD_NETWORK_NAME;
1086 return NULL;
1087 }
1088
1089 /* Handle non-Dfs clients attempting connections to msdfs proxy */
1090 if (lp_host_msdfs() && (*lp_msdfs_proxy(talloc_tos(), snum) != '\0')) {
1091 DEBUG(3, ("refusing connection to dfs proxy share '%s' "
1092 "(pointing to %s)\n",
1093 service, lp_msdfs_proxy(talloc_tos(), snum)));
1094 *status = NT_STATUS_BAD_NETWORK_NAME;
1095 return NULL;
1096 }
1097
1098 DEBUG(5, ("making a connection to 'normal' service %s\n", service));
1099
1100 return make_connection_smb1(sconn, now, snum, vuser,
1101 dev, status);
1102 }
1103
1104 /****************************************************************************
1105 Close a cnum.
1106 ****************************************************************************/
1107
1108 void close_cnum(connection_struct *conn, uint64_t vuid)
1109 {
1110 file_close_conn(conn);
1111
1112 if (!IS_IPC(conn)) {
1113 dptr_closecnum(conn);
1114 }
1115
1116 change_to_root_user();
1117
1118 DEBUG(IS_IPC(conn)?3:1, ("%s (%s) closed connection to service %s\n",
1119 get_remote_machine_name(),
1120 tsocket_address_string(conn->sconn->remote_address,
1121 talloc_tos()),
1122 lp_servicename(talloc_tos(), SNUM(conn))));
1123
1124 /* Call VFS disconnect hook */
1125 SMB_VFS_DISCONNECT(conn);
1126
1127 /* make sure we leave the directory available for unmount */
1128 vfs_ChDir(conn, "/");
1129
1130 /* execute any "postexec = " line */
1131 if (*lp_postexec(talloc_tos(), SNUM(conn)) &&
1132 change_to_user(conn, vuid)) {
1133 char *cmd = talloc_sub_advanced(talloc_tos(),
1134 lp_servicename(talloc_tos(), SNUM(conn)),
1135 conn->session_info->unix_info->unix_name,
1136 conn->connectpath,
1137 conn->session_info->unix_token->gid,
1138 conn->session_info->unix_info->sanitized_username,
1139 conn->session_info->info->domain_name,
1140 lp_postexec(talloc_tos(), SNUM(conn)));
1141 smbrun(cmd,NULL);
1142 TALLOC_FREE(cmd);
1143 change_to_root_user();
1144 }
1145
1146 change_to_root_user();
1147 /* execute any "root postexec = " line */
1148 if (*lp_rootpostexec(talloc_tos(), SNUM(conn))) {
1149 char *cmd = talloc_sub_advanced(talloc_tos(),
1150 lp_servicename(talloc_tos(), SNUM(conn)),
1151 conn->session_info->unix_info->unix_name,
1152 conn->connectpath,
1153 conn->session_info->unix_token->gid,
1154 conn->session_info->unix_info->sanitized_username,
1155 conn->session_info->info->domain_name,
1156 lp_rootpostexec(talloc_tos(), SNUM(conn)));
1157 smbrun(cmd,NULL);
1158 TALLOC_FREE(cmd);
1159 }
1160
1161 conn_free(conn);
1162 }
reg import