source: vendor/3.6.23/source3/smbd/service.c

Last change on this file was 860, checked in by Silvan Scherrer, 11 years ago

Samba 3.6: updated vendor to latest version
File size: 38.4 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3 service (connection) opening and closing
4 Copyright (C) Andrew Tridgell 1992-1998
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
18*/
19
20#include "includes.h"
21#include "system/filesys.h"
22#include "../lib/tsocket/tsocket.h"
23#include "smbd/smbd.h"
24#include "smbd/globals.h"
25#include "../librpc/gen_ndr/netlogon.h"
26#include "../libcli/security/security.h"
27#include "printing/pcap.h"
28#include "passdb/lookup_sid.h"
29#include "auth.h"
30
31extern userdom_struct current_user_info;
32
33static bool canonicalize_connect_path(connection_struct *conn)
34{
35 bool ret;
36 char *resolved_name = SMB_VFS_REALPATH(conn,conn->connectpath);
37 if (!resolved_name) {
38 return false;
39 }
40 ret = set_conn_connectpath(conn,resolved_name);
41 SAFE_FREE(resolved_name);
42 return ret;
43}
44
45/****************************************************************************
46 Ensure when setting connectpath it is a canonicalized (no ./ // or ../)
47 absolute path stating in / and not ending in /.
48 Observent people will notice a similarity between this and check_path_syntax :-).
49****************************************************************************/
50
51bool set_conn_connectpath(connection_struct *conn, const char *connectpath)
52{
53 char *destname;
54 char *d;
55 const char *s = connectpath;
56 bool start_of_name_component = true;
57
58 if (connectpath == NULL || connectpath[0] == '\0') {
59 return false;
60 }
61
62 /* Allocate for strlen + '\0' + possible leading '/' */
63 destname = (char *)SMB_MALLOC(strlen(connectpath) + 2);
64 if (!destname) {
65 return false;
66 }
67 d = destname;
68
69 *d++ = '/'; /* Always start with root. */
70
71 while (*s) {
72 if (*s == '/') {
73 /* Eat multiple '/' */
74 while (*s == '/') {
75 s++;
76 }
77 if ((d > destname + 1) && (*s != '\0')) {
78 *d++ = '/';
79 }
80 start_of_name_component = True;
81 continue;
82 }
83
84 if (start_of_name_component) {
85 if ((s[0] == '.') && (s[1] == '.') && (s[2] == '/' || s[2] == '\0')) {
86 /* Uh oh - "/../" or "/..\0" ! */
87
88 /* Go past the ../ or .. */
89 if (s[2] == '/') {
90 s += 3;
91 } else {
92 s += 2; /* Go past the .. */
93 }
94
95 /* If we just added a '/' - delete it */
96 if ((d > destname) && (*(d-1) == '/')) {
97 *(d-1) = '\0';
98 d--;
99 }
100
101 /* Are we at the start ? Can't go back further if so. */
102 if (d <= destname) {
103 *d++ = '/'; /* Can't delete root */
104 continue;
105 }
106 /* Go back one level... */
107 /* Decrement d first as d points to the *next* char to write into. */
108 for (d--; d > destname; d--) {
109 if (*d == '/') {
110 break;
111 }
112 }
113 /* We're still at the start of a name component, just the previous one. */
114 continue;
115 } else if ((s[0] == '.') && ((s[1] == '\0') || s[1] == '/')) {
116 /* Component of pathname can't be "." only - skip the '.' . */
117 if (s[1] == '/') {
118 s += 2;
119 } else {
120 s++;
121 }
122 continue;
123 }
124 }
125
126 if (!(*s & 0x80)) {
127 *d++ = *s++;
128 } else {
129 size_t siz;
130 /* Get the size of the next MB character. */
131 next_codepoint(s,&siz);
132 switch(siz) {
133 case 5:
134 *d++ = *s++;
135 /*fall through*/
136 case 4:
137 *d++ = *s++;
138 /*fall through*/
139 case 3:
140 *d++ = *s++;
141 /*fall through*/
142 case 2:
143 *d++ = *s++;
144 /*fall through*/
145 case 1:
146 *d++ = *s++;
147 break;
148 default:
149 break;
150 }
151 }
152 start_of_name_component = false;
153 }
154 *d = '\0';
155
156 /* And must not end in '/' */
157 if (d > destname + 1 && (*(d-1) == '/')) {
158 *(d-1) = '\0';
159 }
160
161 DEBUG(10,("set_conn_connectpath: service %s, connectpath = %s\n",
162 lp_servicename(SNUM(conn)), destname ));
163
164 string_set(&conn->connectpath, destname);
165 SAFE_FREE(destname);
166 return true;
167}
168
169/****************************************************************************
170 Load parameters specific to a connection/service.
171****************************************************************************/
172
173bool set_current_service(connection_struct *conn, uint16 flags, bool do_chdir)
174{
175 int snum;
176
177 if (!conn) {
178 last_conn = NULL;
179 return(False);
180 }
181
182 conn->lastused_count++;
183
184 snum = SNUM(conn);
185
186 if (do_chdir &&
187 vfs_ChDir(conn,conn->connectpath) != 0 &&
188 vfs_ChDir(conn,conn->origpath) != 0) {
189 DEBUG(((errno!=EACCES)?0:3),("chdir (%s) failed, reason: %s\n",
190 conn->connectpath, strerror(errno)));
191 return(False);
192 }
193
194 if ((conn == last_conn) && (last_flags == flags)) {
195 return(True);
196 }
197
198 last_conn = conn;
199 last_flags = flags;
200
201 /* Obey the client case sensitivity requests - only for clients that support it. */
202 switch (lp_casesensitive(snum)) {
203 case Auto:
204 {
205 /* We need this uglyness due to DOS/Win9x clients that lie about case insensitivity. */
206 enum remote_arch_types ra_type = get_remote_arch();
207 if ((ra_type != RA_SAMBA) && (ra_type != RA_CIFSFS)) {
208 /* Client can't support per-packet case sensitive pathnames. */
209 conn->case_sensitive = False;
210 } else {
211 conn->case_sensitive = !(flags & FLAG_CASELESS_PATHNAMES);
212 }
213 }
214 break;
215 case True:
216 conn->case_sensitive = True;
217 break;
218 default:
219 conn->case_sensitive = False;
220 break;
221 }
222 return(True);
223}
224
225static int load_registry_service(const char *servicename)
226{
227 if (!lp_registry_shares()) {
228 return -1;
229 }
230
231 if ((servicename == NULL) || (*servicename == '\0')) {
232 return -1;
233 }
234
235 if (strequal(servicename, GLOBAL_NAME)) {
236 return -2;
237 }
238
239 if (!process_registry_service(servicename)) {
240 return -1;
241 }
242
243 return lp_servicenumber(servicename);
244}
245
246void load_registry_shares(void)
247{
248 DEBUG(8, ("load_registry_shares()\n"));
249 if (!lp_registry_shares()) {
250 return;
251 }
252
253 process_registry_shares();
254
255 return;
256}
257
258/****************************************************************************
259 Add a home service. Returns the new service number or -1 if fail.
260****************************************************************************/
261
262int add_home_service(const char *service, const char *username, const char *homedir)
263{
264 int iHomeService;
265
266 if (!service || !homedir || homedir[0] == '\0')
267 return -1;
268
269 if ((iHomeService = lp_servicenumber(HOMES_NAME)) < 0) {
270 if ((iHomeService = load_registry_service(HOMES_NAME)) < 0) {
271 return -1;
272 }
273 }
274
275 /*
276 * If this is a winbindd provided username, remove
277 * the domain component before adding the service.
278 * Log a warning if the "path=" parameter does not
279 * include any macros.
280 */
281
282 {
283 const char *p = strchr(service,*lp_winbind_separator());
284
285 /* We only want the 'user' part of the string */
286 if (p) {
287 service = p + 1;
288 }
289 }
290
291 if (!lp_add_home(service, iHomeService, username, homedir)) {
292 return -1;
293 }
294
295 return lp_servicenumber(service);
296
297}
298
299/**
300 * Find a service entry.
301 *
302 * @param service is modified (to canonical form??)
303 **/
304
305int find_service(TALLOC_CTX *ctx, const char *service_in, char **p_service_out)
306{
307 int iService;
308
309 if (!service_in) {
310 return -1;
311 }
312
313 /* First make a copy. */
314 *p_service_out = talloc_strdup(ctx, service_in);
315 if (!*p_service_out) {
316 return -1;
317 }
318
319 all_string_sub(*p_service_out,"\\","/",0);
320
321 iService = lp_servicenumber(*p_service_out);
322
323 /* now handle the special case of a home directory */
324 if (iService < 0) {
325 char *phome_dir = get_user_home_dir(ctx, *p_service_out);
326
327 if(!phome_dir) {
328 /*
329 * Try mapping the servicename, it may
330 * be a Windows to unix mapped user name.
331 */
332 if(map_username(ctx, *p_service_out, p_service_out)) {
333 if (*p_service_out == NULL) {
334 /* Out of memory. */
335 return -1;
336 }
337 phome_dir = get_user_home_dir(
338 ctx, *p_service_out);
339 }
340 }
341
342 DEBUG(3,("checking for home directory %s gave %s\n",*p_service_out,
343 phome_dir?phome_dir:"(NULL)"));
344
345 iService = add_home_service(*p_service_out,*p_service_out /* 'username' */, phome_dir);
346 }
347
348 /* If we still don't have a service, attempt to add it as a printer. */
349 if (iService < 0) {
350 int iPrinterService;
351
352 if ((iPrinterService = lp_servicenumber(PRINTERS_NAME)) < 0) {
353 iPrinterService = load_registry_service(PRINTERS_NAME);
354 }
355 if (iPrinterService >= 0) {
356 DEBUG(3,("checking whether %s is a valid printer name...\n",
357 *p_service_out));
358 if (pcap_printername_ok(*p_service_out)) {
359 DEBUG(3,("%s is a valid printer name\n",
360 *p_service_out));
361 DEBUG(3,("adding %s as a printer service\n",
362 *p_service_out));
363 lp_add_printer(*p_service_out, iPrinterService);
364 iService = lp_servicenumber(*p_service_out);
365 if (iService < 0) {
366 DEBUG(0,("failed to add %s as a printer service!\n",
367 *p_service_out));
368 }
369 } else {
370 DEBUG(3,("%s is not a valid printer name\n",
371 *p_service_out));
372 }
373 }
374 }
375
376 /* Check for default vfs service? Unsure whether to implement this */
377 if (iService < 0) {
378 }
379
380 if (iService < 0) {
381 iService = load_registry_service(*p_service_out);
382 }
383
384 /* Is it a usershare service ? */
385 if (iService < 0 && *lp_usershare_path()) {
386 /* Ensure the name is canonicalized. */
387 strlower_m(*p_service_out);
388 iService = load_usershare_service(*p_service_out);
389 }
390
391 /* just possibly it's a default service? */
392 if (iService < 0) {
393 char *pdefservice = lp_defaultservice();
394 if (pdefservice &&
395 *pdefservice &&
396 !strequal(pdefservice, *p_service_out)
397 && !strstr_m(*p_service_out,"..")) {
398 /*
399 * We need to do a local copy here as lp_defaultservice()
400 * returns one of the rotating lp_string buffers that
401 * could get overwritten by the recursive find_service() call
402 * below. Fix from Josef Hinteregger <joehtg@joehtg.co.at>.
403 */
404 char *defservice = talloc_strdup(ctx, pdefservice);
405
406 if (!defservice) {
407 goto fail;
408 }
409
410 /* Disallow anything except explicit share names. */
411 if (strequal(defservice,HOMES_NAME) ||
412 strequal(defservice, PRINTERS_NAME) ||
413 strequal(defservice, "IPC$")) {
414 TALLOC_FREE(defservice);
415 goto fail;
416 }
417
418 iService = find_service(ctx, defservice, p_service_out);
419 if (!*p_service_out) {
420 TALLOC_FREE(defservice);
421 iService = -1;
422 goto fail;
423 }
424 if (iService >= 0) {
425 all_string_sub(*p_service_out, "_","/",0);
426 iService = lp_add_service(*p_service_out, iService);
427 }
428 TALLOC_FREE(defservice);
429 }
430 }
431
432 if (iService >= 0) {
433 if (!VALID_SNUM(iService)) {
434 DEBUG(0,("Invalid snum %d for %s\n",iService,
435 *p_service_out));
436 iService = -1;
437 }
438 }
439
440 fail:
441
442 if (iService < 0) {
443 DEBUG(3,("find_service() failed to find service %s\n",
444 *p_service_out));
445 }
446
447 return (iService);
448}
449
450
451/****************************************************************************
452 do some basic sainity checks on the share.
453 This function modifies dev, ecode.
454****************************************************************************/
455
456static NTSTATUS share_sanity_checks(struct client_address *client_id, int snum,
457 fstring dev)
458{
459 if (!lp_snum_ok(snum) ||
460 !allow_access(lp_hostsdeny(snum), lp_hostsallow(snum),
461 client_id->name, client_id->addr)) {
462 return NT_STATUS_ACCESS_DENIED;
463 }
464
465 if (dev[0] == '?' || !dev[0]) {
466 if (lp_print_ok(snum)) {
467 fstrcpy(dev,"LPT1:");
468 } else if (strequal(lp_fstype(snum), "IPC")) {
469 fstrcpy(dev, "IPC");
470 } else {
471 fstrcpy(dev,"A:");
472 }
473 }
474
475 strupper_m(dev);
476
477 if (lp_print_ok(snum)) {
478 if (!strequal(dev, "LPT1:")) {
479 return NT_STATUS_BAD_DEVICE_TYPE;
480 }
481 } else if (strequal(lp_fstype(snum), "IPC")) {
482 if (!strequal(dev, "IPC")) {
483 return NT_STATUS_BAD_DEVICE_TYPE;
484 }
485 } else if (!strequal(dev, "A:")) {
486 return NT_STATUS_BAD_DEVICE_TYPE;
487 }
488
489 /* Behave as a printer if we are supposed to */
490 if (lp_print_ok(snum) && (strcmp(dev, "A:") == 0)) {
491 fstrcpy(dev, "LPT1:");
492 }
493
494 return NT_STATUS_OK;
495}
496
497/*
498 * Go through lookup_name etc to find the force'd group.
499 *
500 * Create a new token from src_token, replacing the primary group sid with the
501 * one found.
502 */
503
504static NTSTATUS find_forced_group(bool force_user,
505 int snum, const char *username,
506 struct dom_sid *pgroup_sid,
507 gid_t *pgid)
508{
509 NTSTATUS result = NT_STATUS_NO_SUCH_GROUP;
510 TALLOC_CTX *frame = talloc_stackframe();
511 struct dom_sid group_sid;
512 enum lsa_SidType type;
513 char *groupname;
514 bool user_must_be_member = False;
515 gid_t gid;
516
517 groupname = talloc_strdup(talloc_tos(), lp_force_group(snum));
518 if (groupname == NULL) {
519 DEBUG(1, ("talloc_strdup failed\n"));
520 result = NT_STATUS_NO_MEMORY;
521 goto done;
522 }
523
524 if (groupname[0] == '+') {
525 user_must_be_member = True;
526 groupname += 1;
527 }
528
529 groupname = talloc_string_sub(talloc_tos(), groupname,
530 "%S", lp_servicename(snum));
531 if (groupname == NULL) {
532 DEBUG(1, ("talloc_string_sub failed\n"));
533 result = NT_STATUS_NO_MEMORY;
534 goto done;
535 }
536
537 if (!lookup_name_smbconf(talloc_tos(), groupname,
538 LOOKUP_NAME_ALL|LOOKUP_NAME_GROUP,
539 NULL, NULL, &group_sid, &type)) {
540 DEBUG(10, ("lookup_name_smbconf(%s) failed\n",
541 groupname));
542 goto done;
543 }
544
545 if ((type != SID_NAME_DOM_GRP) && (type != SID_NAME_ALIAS) &&
546 (type != SID_NAME_WKN_GRP)) {
547 DEBUG(10, ("%s is a %s, not a group\n", groupname,
548 sid_type_lookup(type)));
549 goto done;
550 }
551
552 if (!sid_to_gid(&group_sid, &gid)) {
553 DEBUG(10, ("sid_to_gid(%s) for %s failed\n",
554 sid_string_dbg(&group_sid), groupname));
555 goto done;
556 }
557
558 /*
559 * If the user has been forced and the forced group starts with a '+',
560 * then we only set the group to be the forced group if the forced
561 * user is a member of that group. Otherwise, the meaning of the '+'
562 * would be ignored.
563 */
564
565 if (force_user && user_must_be_member) {
566 if (user_in_group_sid(username, &group_sid)) {
567 sid_copy(pgroup_sid, &group_sid);
568 *pgid = gid;
569 DEBUG(3,("Forced group %s for member %s\n",
570 groupname, username));
571 } else {
572 DEBUG(0,("find_forced_group: forced user %s is not a member "
573 "of forced group %s. Disallowing access.\n",
574 username, groupname ));
575 result = NT_STATUS_MEMBER_NOT_IN_GROUP;
576 goto done;
577 }
578 } else {
579 sid_copy(pgroup_sid, &group_sid);
580 *pgid = gid;
581 DEBUG(3,("Forced group %s\n", groupname));
582 }
583
584 result = NT_STATUS_OK;
585 done:
586 TALLOC_FREE(frame);
587 return result;
588}
589
590/****************************************************************************
591 Create an auth_serversupplied_info structure for a connection_struct
592****************************************************************************/
593
594static NTSTATUS create_connection_session_info(struct smbd_server_connection *sconn,
595 TALLOC_CTX *mem_ctx, int snum,
596 struct auth_serversupplied_info *vuid_serverinfo,
597 DATA_BLOB password,
598 struct auth_serversupplied_info **presult)
599{
600 if (lp_guest_only(snum)) {
601 return make_server_info_guest(mem_ctx, presult);
602 }
603
604 if (vuid_serverinfo != NULL) {
605
606 struct auth_serversupplied_info *result;
607
608 /*
609 * This is the normal security != share case where we have a
610 * valid vuid from the session setup. */
611
612 if (vuid_serverinfo->guest) {
613 if (!lp_guest_ok(snum)) {
614 DEBUG(2, ("guest user (from session setup) "
615 "not permitted to access this share "
616 "(%s)\n", lp_servicename(snum)));
617 return NT_STATUS_ACCESS_DENIED;
618 }
619 } else {
620 if (!user_ok_token(vuid_serverinfo->unix_name,
621 vuid_serverinfo->info3->base.domain.string,
622 vuid_serverinfo->security_token, snum)) {
623 DEBUG(2, ("user '%s' (from session setup) not "
624 "permitted to access this share "
625 "(%s)\n",
626 vuid_serverinfo->unix_name,
627 lp_servicename(snum)));
628 return NT_STATUS_ACCESS_DENIED;
629 }
630 }
631
632 result = copy_serverinfo(mem_ctx, vuid_serverinfo);
633 if (result == NULL) {
634 return NT_STATUS_NO_MEMORY;
635 }
636
637 *presult = result;
638 return NT_STATUS_OK;
639 }
640
641 if (lp_security() == SEC_SHARE) {
642
643 fstring user;
644 bool guest;
645
646 /* add the sharename as a possible user name if we
647 are in share mode security */
648
649 add_session_user(sconn, lp_servicename(snum));
650
651 /* shall we let them in? */
652
653 if (!authorise_login(sconn, snum,user,password,&guest)) {
654 DEBUG( 2, ( "Invalid username/password for [%s]\n",
655 lp_servicename(snum)) );
656 return NT_STATUS_WRONG_PASSWORD;
657 }
658
659 return make_serverinfo_from_username(mem_ctx, user, guest, guest,
660 presult);
661 }
662
663 DEBUG(0, ("invalid VUID (vuser) but not in security=share\n"));
664 return NT_STATUS_ACCESS_DENIED;
665}
666
667/****************************************************************************
668 set relavent user and group settings corresponding to force user/group
669 configuration for the given snum.
670****************************************************************************/
671
672NTSTATUS set_conn_force_user_group(connection_struct *conn, int snum)
673{
674 NTSTATUS status;
675
676 if (*lp_force_user(snum)) {
677
678 /*
679 * Replace conn->session_info with a completely faked up one
680 * from the username we are forced into :-)
681 */
682
683 char *fuser;
684 struct auth_serversupplied_info *forced_serverinfo;
685
686 fuser = talloc_string_sub(conn, lp_force_user(snum), "%S",
687 lp_const_servicename(snum));
688 if (fuser == NULL) {
689 return NT_STATUS_NO_MEMORY;
690 }
691
692 status = make_serverinfo_from_username(
693 conn, fuser, false, conn->session_info->guest,
694 &forced_serverinfo);
695 if (!NT_STATUS_IS_OK(status)) {
696 return status;
697 }
698
699 /* We don't want to replace the original sanitized_username
700 as it is the original user given in the connect attempt.
701 This is used in '%U' substitutions. */
702 TALLOC_FREE(forced_serverinfo->sanitized_username);
703 forced_serverinfo->sanitized_username =
704 talloc_move(forced_serverinfo,
705 &conn->session_info->sanitized_username);
706
707 TALLOC_FREE(conn->session_info);
708 conn->session_info = forced_serverinfo;
709
710 conn->force_user = true;
711 DEBUG(3,("Forced user %s\n", fuser));
712 }
713
714 /*
715 * If force group is true, then override
716 * any groupid stored for the connecting user.
717 */
718
719 if (*lp_force_group(snum)) {
720
721 status = find_forced_group(
722 conn->force_user, snum, conn->session_info->unix_name,
723 &conn->session_info->security_token->sids[1],
724 &conn->session_info->utok.gid);
725
726 if (!NT_STATUS_IS_OK(status)) {
727 return status;
728 }
729
730 /*
731 * We need to cache this gid, to use within
732 * change_to_user() separately from the conn->session_info
733 * struct. We only use conn->session_info directly if
734 * "force_user" was set.
735 */
736 conn->force_group_gid = conn->session_info->utok.gid;
737 }
738
739 return NT_STATUS_OK;
740}
741
742/****************************************************************************
743 Setup the share access mask for a connection.
744****************************************************************************/
745
746static void create_share_access_mask(connection_struct *conn, int snum)
747{
748 const struct security_token *token = conn->session_info->security_token;
749
750 share_access_check(token,
751 lp_servicename(snum),
752 MAXIMUM_ALLOWED_ACCESS,
753 &conn->share_access);
754
755 if (security_token_has_privilege(token, SEC_PRIV_SECURITY)) {
756 conn->share_access |= SEC_FLAG_SYSTEM_SECURITY;
757 }
758 if (security_token_has_privilege(token, SEC_PRIV_RESTORE)) {
759 conn->share_access |= (SEC_RIGHTS_PRIV_RESTORE);
760 }
761 if (security_token_has_privilege(token, SEC_PRIV_BACKUP)) {
762 conn->share_access |= (SEC_RIGHTS_PRIV_BACKUP);
763 }
764 if (security_token_has_privilege(token, SEC_PRIV_TAKE_OWNERSHIP)) {
765 conn->share_access |= (SEC_STD_WRITE_OWNER);
766 }
767}
768
769/****************************************************************************
770 Make a connection, given the snum to connect to, and the vuser of the
771 connecting user if appropriate.
772****************************************************************************/
773
774static connection_struct *make_connection_snum(struct smbd_server_connection *sconn,
775 connection_struct *conn,
776 int snum, user_struct *vuser,
777 DATA_BLOB password,
778 const char *pdev,
779 NTSTATUS *pstatus)
780{
781 struct smb_filename *smb_fname_cpath = NULL;
782 fstring dev;
783 int ret;
784 bool on_err_call_dis_hook = false;
785 bool claimed_connection = false;
786 uid_t effuid;
787 gid_t effgid;
788 NTSTATUS status;
789
790 fstrcpy(dev, pdev);
791
792 *pstatus = share_sanity_checks(&sconn->client_id, snum, dev);
793 if (NT_STATUS_IS_ERR(*pstatus)) {
794 goto err_root_exit;
795 }
796
797 conn->params->service = snum;
798
799 status = create_connection_session_info(sconn,
800 conn, snum, vuser ? vuser->session_info : NULL, password,
801 &conn->session_info);
802
803 if (!NT_STATUS_IS_OK(status)) {
804 DEBUG(1, ("create_connection_session_info failed: %s\n",
805 nt_errstr(status)));
806 *pstatus = status;
807 goto err_root_exit;
808 }
809
810 if ((lp_guest_only(snum)) || (lp_security() == SEC_SHARE)) {
811 conn->force_user = true;
812 }
813
814 add_session_user(sconn, conn->session_info->unix_name);
815
816 conn->num_files_open = 0;
817 conn->lastused = conn->lastused_count = time(NULL);
818 conn->used = True;
819 conn->printer = (strncmp(dev,"LPT",3) == 0);
820 conn->ipc = ( (strncmp(dev,"IPC",3) == 0) ||
821 ( lp_enable_asu_support() && strequal(dev,"ADMIN$")) );
822
823 /* Case options for the share. */
824 if (lp_casesensitive(snum) == Auto) {
825 /* We will be setting this per packet. Set to be case
826 * insensitive for now. */
827 conn->case_sensitive = False;
828 } else {
829 conn->case_sensitive = (bool)lp_casesensitive(snum);
830 }
831
832 conn->case_preserve = lp_preservecase(snum);
833 conn->short_case_preserve = lp_shortpreservecase(snum);
834
835 conn->encrypt_level = lp_smb_encrypt(snum);
836
837 conn->veto_list = NULL;
838 conn->hide_list = NULL;
839 conn->veto_oplock_list = NULL;
840 conn->aio_write_behind_list = NULL;
841
842 conn->read_only = lp_readonly(SNUM(conn));
843
844 status = set_conn_force_user_group(conn, snum);
845 if (!NT_STATUS_IS_OK(status)) {
846 *pstatus = status;
847 return NULL;
848 }
849
850 conn->vuid = (vuser != NULL) ? vuser->vuid : UID_FIELD_INVALID;
851
852 {
853 char *s = talloc_sub_advanced(talloc_tos(),
854 lp_servicename(SNUM(conn)),
855 conn->session_info->unix_name,
856 conn->connectpath,
857 conn->session_info->utok.gid,
858 conn->session_info->sanitized_username,
859 conn->session_info->info3->base.domain.string,
860 lp_pathname(snum));
861 if (!s) {
862 *pstatus = NT_STATUS_NO_MEMORY;
863 goto err_root_exit;
864 }
865
866 if (!set_conn_connectpath(conn,s)) {
867 TALLOC_FREE(s);
868 *pstatus = NT_STATUS_NO_MEMORY;
869 goto err_root_exit;
870 }
871 DEBUG(3,("Connect path is '%s' for service [%s]\n",s,
872 lp_servicename(snum)));
873 TALLOC_FREE(s);
874 }
875
876 /*
877 * New code to check if there's a share security descripter
878 * added from NT server manager. This is done after the
879 * smb.conf checks are done as we need a uid and token. JRA.
880 *
881 */
882
883 create_share_access_mask(conn, snum);
884
885 if ((conn->share_access & FILE_WRITE_DATA) == 0) {
886 if ((conn->share_access & FILE_READ_DATA) == 0) {
887 /* No access, read or write. */
888 DEBUG(0,("make_connection: connection to %s "
889 "denied due to security "
890 "descriptor.\n",
891 lp_servicename(snum)));
892 *pstatus = NT_STATUS_ACCESS_DENIED;
893 goto err_root_exit;
894 } else {
895 conn->read_only = True;
896 }
897 }
898 /* Initialise VFS function pointers */
899
900 if (!smbd_vfs_init(conn)) {
901 DEBUG(0, ("vfs_init failed for service %s\n",
902 lp_servicename(snum)));
903 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
904 goto err_root_exit;
905 }
906
907/* ROOT Activities: */
908 /* explicitly check widelinks here so that we can correctly warn
909 * in the logs. */
910 widelinks_warning(snum);
911
912 /*
913 * Enforce the max connections parameter.
914 */
915
916 if ((lp_max_connections(snum) > 0)
917 && (count_current_connections(lp_servicename(SNUM(conn)), True) >=
918 lp_max_connections(snum))) {
919
920 DEBUG(1, ("Max connections (%d) exceeded for %s\n",
921 lp_max_connections(snum), lp_servicename(snum)));
922 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
923 goto err_root_exit;
924 }
925
926 /*
927 * Get us an entry in the connections db
928 */
929 if (!claim_connection(conn, lp_servicename(snum))) {
930 DEBUG(1, ("Could not store connections entry\n"));
931 *pstatus = NT_STATUS_INTERNAL_DB_ERROR;
932 goto err_root_exit;
933 }
934 claimed_connection = true;
935
936 /* Invoke VFS make connection hook - this must be the first
937 filesystem operation that we do. */
938
939 if (SMB_VFS_CONNECT(conn, lp_servicename(snum),
940 conn->session_info->unix_name) < 0) {
941 DEBUG(0,("make_connection: VFS make connection failed!\n"));
942 *pstatus = NT_STATUS_UNSUCCESSFUL;
943 goto err_root_exit;
944 }
945
946 /* Any error exit after here needs to call the disconnect hook. */
947 on_err_call_dis_hook = true;
948
949 if ((!conn->printer) && (!conn->ipc)) {
950 conn->notify_ctx = notify_init(conn,
951 sconn_server_id(sconn),
952 sconn->msg_ctx,
953 smbd_event_context(),
954 conn);
955 }
956
957 /*
958 * Fix compatibility issue pointed out by Volker.
959 * We pass the conn->connectpath to the preexec
960 * scripts as a parameter, so attempt to canonicalize
961 * it here before calling the preexec scripts.
962 * We ignore errors here, as it is possible that
963 * the conn->connectpath doesn't exist yet and
964 * the preexec scripts will create them.
965 */
966
967 (void)canonicalize_connect_path(conn);
968
969 /* Preexecs are done here as they might make the dir we are to ChDir
970 * to below */
971 /* execute any "root preexec = " line */
972 if (*lp_rootpreexec(snum)) {
973 char *cmd = talloc_sub_advanced(talloc_tos(),
974 lp_servicename(SNUM(conn)),
975 conn->session_info->unix_name,
976 conn->connectpath,
977 conn->session_info->utok.gid,
978 conn->session_info->sanitized_username,
979 conn->session_info->info3->base.domain.string,
980 lp_rootpreexec(snum));
981 DEBUG(5,("cmd=%s\n",cmd));
982 ret = smbrun(cmd,NULL);
983 TALLOC_FREE(cmd);
984 if (ret != 0 && lp_rootpreexec_close(snum)) {
985 DEBUG(1,("root preexec gave %d - failing "
986 "connection\n", ret));
987 *pstatus = NT_STATUS_ACCESS_DENIED;
988 goto err_root_exit;
989 }
990 }
991
992/* USER Activites: */
993 if (!change_to_user(conn, conn->vuid)) {
994 /* No point continuing if they fail the basic checks */
995 DEBUG(0,("Can't become connected user!\n"));
996 *pstatus = NT_STATUS_LOGON_FAILURE;
997 goto err_root_exit;
998 }
999
1000 effuid = geteuid();
1001 effgid = getegid();
1002
1003 /* Remember that a different vuid can connect later without these
1004 * checks... */
1005
1006 /* Preexecs are done here as they might make the dir we are to ChDir
1007 * to below */
1008
1009 /* execute any "preexec = " line */
1010 if (*lp_preexec(snum)) {
1011 char *cmd = talloc_sub_advanced(talloc_tos(),
1012 lp_servicename(SNUM(conn)),
1013 conn->session_info->unix_name,
1014 conn->connectpath,
1015 conn->session_info->utok.gid,
1016 conn->session_info->sanitized_username,
1017 conn->session_info->info3->base.domain.string,
1018 lp_preexec(snum));
1019 ret = smbrun(cmd,NULL);
1020 TALLOC_FREE(cmd);
1021 if (ret != 0 && lp_preexec_close(snum)) {
1022 DEBUG(1,("preexec gave %d - failing connection\n",
1023 ret));
1024 *pstatus = NT_STATUS_ACCESS_DENIED;
1025 goto err_root_exit;
1026 }
1027 }
1028
1029#ifdef WITH_FAKE_KASERVER
1030 if (lp_afs_share(snum)) {
1031 afs_login(conn);
1032 }
1033#endif
1034
1035 /*
1036 * we've finished with the user stuff - go back to root
1037 * so the SMB_VFS_STAT call will only fail on path errors,
1038 * not permission problems.
1039 */
1040 change_to_root_user();
1041/* ROOT Activites: */
1042
1043 /*
1044 * If widelinks are disallowed we need to canonicalise the connect
1045 * path here to ensure we don't have any symlinks in the
1046 * connectpath. We will be checking all paths on this connection are
1047 * below this directory. We must do this after the VFS init as we
1048 * depend on the realpath() pointer in the vfs table. JRA.
1049 */
1050 if (!lp_widelinks(snum)) {
1051 if (!canonicalize_connect_path(conn)) {
1052 DEBUG(0, ("canonicalize_connect_path failed "
1053 "for service %s, path %s\n",
1054 lp_servicename(snum),
1055 conn->connectpath));
1056 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
1057 goto err_root_exit;
1058 }
1059 }
1060
1061 /* Add veto/hide lists */
1062 if (!IS_IPC(conn) && !IS_PRINT(conn)) {
1063 set_namearray( &conn->veto_list, lp_veto_files(snum));
1064 set_namearray( &conn->hide_list, lp_hide_files(snum));
1065 set_namearray( &conn->veto_oplock_list, lp_veto_oplocks(snum));
1066 set_namearray( &conn->aio_write_behind_list,
1067 lp_aio_write_behind(snum));
1068 }
1069 status = create_synthetic_smb_fname(talloc_tos(), conn->connectpath,
1070 NULL, NULL, &smb_fname_cpath);
1071 if (!NT_STATUS_IS_OK(status)) {
1072 *pstatus = status;
1073 goto err_root_exit;
1074 }
1075
1076 /* win2000 does not check the permissions on the directory
1077 during the tree connect, instead relying on permission
1078 check during individual operations. To match this behaviour
1079 I have disabled this chdir check (tridge) */
1080 /* the alternative is just to check the directory exists */
1081
1082 if ((ret = SMB_VFS_STAT(conn, smb_fname_cpath)) != 0 ||
1083 !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
1084 if (ret == 0 && !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
1085 DEBUG(0,("'%s' is not a directory, when connecting to "
1086 "[%s]\n", conn->connectpath,
1087 lp_servicename(snum)));
1088 } else {
1089 DEBUG(0,("'%s' does not exist or permission denied "
1090 "when connecting to [%s] Error was %s\n",
1091 conn->connectpath, lp_servicename(snum),
1092 strerror(errno) ));
1093 }
1094 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
1095 goto err_root_exit;
1096 }
1097 conn->base_share_dev = smb_fname_cpath->st.st_ex_dev;
1098
1099 string_set(&conn->origpath,conn->connectpath);
1100
1101 /* Figure out the characteristics of the underlying filesystem. This
1102 * assumes that all the filesystem mounted withing a share path have
1103 * the same characteristics, which is likely but not guaranteed.
1104 */
1105
1106 conn->fs_capabilities = SMB_VFS_FS_CAPABILITIES(conn, &conn->ts_res);
1107
1108 /*
1109 * Print out the 'connected as' stuff here as we need
1110 * to know the effective uid and gid we will be using
1111 * (at least initially).
1112 */
1113
1114 if( DEBUGLVL( IS_IPC(conn) ? 3 : 1 ) ) {
1115 dbgtext( "%s (%s) ", get_remote_machine_name(),
1116 conn->sconn->client_id.addr );
1117 dbgtext( "%s", srv_is_signing_active(sconn) ? "signed " : "");
1118 dbgtext( "connect to service %s ", lp_servicename(snum) );
1119 dbgtext( "initially as user %s ",
1120 conn->session_info->unix_name );
1121 dbgtext( "(uid=%d, gid=%d) ", (int)effuid, (int)effgid );
1122 dbgtext( "(pid %d)\n", (int)sys_getpid() );
1123 }
1124
1125 return(conn);
1126
1127 err_root_exit:
1128 TALLOC_FREE(smb_fname_cpath);
1129 /* We must exit this function as root. */
1130 if (geteuid() != 0) {
1131 change_to_root_user();
1132 }
1133 if (on_err_call_dis_hook) {
1134 /* Call VFS disconnect hook */
1135 SMB_VFS_DISCONNECT(conn);
1136 }
1137 if (claimed_connection) {
1138 yield_connection(conn, lp_servicename(snum));
1139 }
1140 return NULL;
1141}
1142
1143/****************************************************************************
1144 Make a connection to a service from SMB1. Internal interface.
1145****************************************************************************/
1146
1147static connection_struct *make_connection_smb1(struct smbd_server_connection *sconn,
1148 int snum, user_struct *vuser,
1149 DATA_BLOB password,
1150 const char *pdev,
1151 NTSTATUS *pstatus)
1152{
1153 connection_struct *ret_conn = NULL;
1154 connection_struct *conn = conn_new(sconn);
1155 if (!conn) {
1156 DEBUG(0,("make_connection_smb1: Couldn't find free connection.\n"));
1157 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
1158 return NULL;
1159 }
1160 ret_conn = make_connection_snum(sconn,
1161 conn,
1162 snum,
1163 vuser,
1164 password,
1165 pdev,
1166 pstatus);
1167 if (ret_conn != conn) {
1168 conn_free(conn);
1169 return NULL;
1170 }
1171 return conn;
1172}
1173
1174/****************************************************************************
1175 Make a connection to a service from SMB2. External SMB2 interface.
1176 We must set cnum before claiming connection.
1177****************************************************************************/
1178
1179connection_struct *make_connection_smb2(struct smbd_server_connection *sconn,
1180 struct smbd_smb2_tcon *tcon,
1181 user_struct *vuser,
1182 DATA_BLOB password,
1183 const char *pdev,
1184 NTSTATUS *pstatus)
1185{
1186 connection_struct *ret_conn = NULL;
1187 connection_struct *conn = conn_new(sconn);
1188 if (!conn) {
1189 DEBUG(0,("make_connection_smb2: Couldn't find free connection.\n"));
1190 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
1191 return NULL;
1192 }
1193 conn->cnum = tcon->tid;
1194 ret_conn = make_connection_snum(sconn,
1195 conn,
1196 tcon->snum,
1197 vuser,
1198 password,
1199 pdev,
1200 pstatus);
1201 if (ret_conn != conn) {
1202 conn_free(conn);
1203 return NULL;
1204 }
1205 return conn;
1206}
1207
1208/****************************************************************************
1209 Make a connection to a service. External SMB1 interface.
1210 *
1211 * @param service
1212****************************************************************************/
1213
1214connection_struct *make_connection(struct smbd_server_connection *sconn,
1215 const char *service_in, DATA_BLOB password,
1216 const char *pdev, uint16 vuid,
1217 NTSTATUS *status)
1218{
1219 uid_t euid;
1220 user_struct *vuser = NULL;
1221 char *service = NULL;
1222 fstring dev;
1223 int snum = -1;
1224
1225 fstrcpy(dev, pdev);
1226
1227 /* This must ONLY BE CALLED AS ROOT. As it exits this function as
1228 * root. */
1229 if (!non_root_mode() && (euid = geteuid()) != 0) {
1230 DEBUG(0,("make_connection: PANIC ERROR. Called as nonroot "
1231 "(%u)\n", (unsigned int)euid ));
1232 smb_panic("make_connection: PANIC ERROR. Called as nonroot\n");
1233 }
1234
1235 if (conn_num_open(sconn) > 2047) {
1236 *status = NT_STATUS_INSUFF_SERVER_RESOURCES;
1237 return NULL;
1238 }
1239
1240 if(lp_security() != SEC_SHARE) {
1241 vuser = get_valid_user_struct(sconn, vuid);
1242 if (!vuser) {
1243 DEBUG(1,("make_connection: refusing to connect with "
1244 "no session setup\n"));
1245 *status = NT_STATUS_ACCESS_DENIED;
1246 return NULL;
1247 }
1248 }
1249
1250 /* Logic to try and connect to the correct [homes] share, preferably
1251 without too many getpwnam() lookups. This is particulary nasty for
1252 winbind usernames, where the share name isn't the same as unix
1253 username.
1254
1255 The snum of the homes share is stored on the vuser at session setup
1256 time.
1257 */
1258
1259 if (strequal(service_in,HOMES_NAME)) {
1260 if(lp_security() != SEC_SHARE) {
1261 DATA_BLOB no_pw = data_blob_null;
1262 if (vuser->homes_snum == -1) {
1263 DEBUG(2, ("[homes] share not available for "
1264 "this user because it was not found "
1265 "or created at session setup "
1266 "time\n"));
1267 *status = NT_STATUS_BAD_NETWORK_NAME;
1268 return NULL;
1269 }
1270 DEBUG(5, ("making a connection to [homes] service "
1271 "created at session setup time\n"));
1272 return make_connection_smb1(sconn,
1273 vuser->homes_snum,
1274 vuser, no_pw,
1275 dev, status);
1276 } else {
1277 /* Security = share. Try with
1278 * current_user_info.smb_name as the username. */
1279 if (*current_user_info.smb_name) {
1280 char *unix_username = NULL;
1281 (void)map_username(talloc_tos(),
1282 current_user_info.smb_name,
1283 &unix_username);
1284 snum = find_service(talloc_tos(),
1285 unix_username,
1286 &unix_username);
1287 if (!unix_username) {
1288 *status = NT_STATUS_NO_MEMORY;
1289 }
1290 return NULL;
1291 }
1292 if (snum != -1) {
1293 DEBUG(5, ("making a connection to 'homes' "
1294 "service %s based on "
1295 "security=share\n", service_in));
1296 return make_connection_smb1(sconn,
1297 snum, NULL,
1298 password,
1299 dev, status);
1300 }
1301 }
1302 } else if ((lp_security() != SEC_SHARE) && (vuser->homes_snum != -1)
1303 && strequal(service_in,
1304 lp_servicename(vuser->homes_snum))) {
1305 DATA_BLOB no_pw = data_blob_null;
1306 DEBUG(5, ("making a connection to 'homes' service [%s] "
1307 "created at session setup time\n", service_in));
1308 return make_connection_smb1(sconn,
1309 vuser->homes_snum,
1310 vuser, no_pw,
1311 dev, status);
1312 }
1313
1314 service = talloc_strdup(talloc_tos(), service_in);
1315 if (!service) {
1316 *status = NT_STATUS_NO_MEMORY;
1317 return NULL;
1318 }
1319
1320 strlower_m(service);
1321
1322 snum = find_service(talloc_tos(), service, &service);
1323 if (!service) {
1324 *status = NT_STATUS_NO_MEMORY;
1325 return NULL;
1326 }
1327
1328 if (snum < 0) {
1329 if (strequal(service,"IPC$") ||
1330 (lp_enable_asu_support() && strequal(service,"ADMIN$"))) {
1331 DEBUG(3,("refusing IPC connection to %s\n", service));
1332 *status = NT_STATUS_ACCESS_DENIED;
1333 return NULL;
1334 }
1335
1336 DEBUG(3,("%s (%s) couldn't find service %s\n",
1337 get_remote_machine_name(),
1338 tsocket_address_string(
1339 sconn->remote_address, talloc_tos()),
1340 service));
1341 *status = NT_STATUS_BAD_NETWORK_NAME;
1342 return NULL;
1343 }
1344
1345 /* Handle non-Dfs clients attempting connections to msdfs proxy */
1346 if (lp_host_msdfs() && (*lp_msdfs_proxy(snum) != '\0')) {
1347 DEBUG(3, ("refusing connection to dfs proxy share '%s' "
1348 "(pointing to %s)\n",
1349 service, lp_msdfs_proxy(snum)));
1350 *status = NT_STATUS_BAD_NETWORK_NAME;
1351 return NULL;
1352 }
1353
1354 DEBUG(5, ("making a connection to 'normal' service %s\n", service));
1355
1356 return make_connection_smb1(sconn, snum, vuser,
1357 password,
1358 dev, status);
1359}
1360
1361/****************************************************************************
1362 Close a cnum.
1363****************************************************************************/
1364
1365void close_cnum(connection_struct *conn, uint16 vuid)
1366{
1367 file_close_conn(conn);
1368
1369 if (!IS_IPC(conn)) {
1370 dptr_closecnum(conn);
1371 }
1372
1373 change_to_root_user();
1374
1375 DEBUG(IS_IPC(conn)?3:1, ("%s (%s) closed connection to service %s\n",
1376 get_remote_machine_name(),
1377 conn->sconn->client_id.addr,
1378 lp_servicename(SNUM(conn))));
1379
1380 /* Call VFS disconnect hook */
1381 SMB_VFS_DISCONNECT(conn);
1382
1383 yield_connection(conn, lp_servicename(SNUM(conn)));
1384
1385 /* make sure we leave the directory available for unmount */
1386 vfs_ChDir(conn, "/");
1387
1388 /* execute any "postexec = " line */
1389 if (*lp_postexec(SNUM(conn)) &&
1390 change_to_user(conn, vuid)) {
1391 char *cmd = talloc_sub_advanced(talloc_tos(),
1392 lp_servicename(SNUM(conn)),
1393 conn->session_info->unix_name,
1394 conn->connectpath,
1395 conn->session_info->utok.gid,
1396 conn->session_info->sanitized_username,
1397 conn->session_info->info3->base.domain.string,
1398 lp_postexec(SNUM(conn)));
1399 smbrun(cmd,NULL);
1400 TALLOC_FREE(cmd);
1401 change_to_root_user();
1402 }
1403
1404 change_to_root_user();
1405 /* execute any "root postexec = " line */
1406 if (*lp_rootpostexec(SNUM(conn))) {
1407 char *cmd = talloc_sub_advanced(talloc_tos(),
1408 lp_servicename(SNUM(conn)),
1409 conn->session_info->unix_name,
1410 conn->connectpath,
1411 conn->session_info->utok.gid,
1412 conn->session_info->sanitized_username,
1413 conn->session_info->info3->base.domain.string,
1414 lp_rootpostexec(SNUM(conn)));
1415 smbrun(cmd,NULL);
1416 TALLOC_FREE(cmd);
1417 }
1418
1419 conn_free(conn);
1420}
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