source: vendor/3.6.0/source3/smbd/service.c

Last change on this file was 740, checked in by Silvan Scherrer, 13 years ago

Samba Server: update vendor to 3.6.0
File size: 36.9 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,
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, conn->session_info->guest,
694 &forced_serverinfo);
695 if (!NT_STATUS_IS_OK(status)) {
696 return status;
697 }
698
699 TALLOC_FREE(conn->session_info);
700 conn->session_info = forced_serverinfo;
701
702 conn->force_user = true;
703 DEBUG(3,("Forced user %s\n", fuser));
704 }
705
706 /*
707 * If force group is true, then override
708 * any groupid stored for the connecting user.
709 */
710
711 if (*lp_force_group(snum)) {
712
713 status = find_forced_group(
714 conn->force_user, snum, conn->session_info->unix_name,
715 &conn->session_info->security_token->sids[1],
716 &conn->session_info->utok.gid);
717
718 if (!NT_STATUS_IS_OK(status)) {
719 return status;
720 }
721
722 /*
723 * We need to cache this gid, to use within
724 * change_to_user() separately from the conn->session_info
725 * struct. We only use conn->session_info directly if
726 * "force_user" was set.
727 */
728 conn->force_group_gid = conn->session_info->utok.gid;
729 }
730
731 return NT_STATUS_OK;
732}
733
734/****************************************************************************
735 Make a connection, given the snum to connect to, and the vuser of the
736 connecting user if appropriate.
737****************************************************************************/
738
739connection_struct *make_connection_snum(struct smbd_server_connection *sconn,
740 int snum, user_struct *vuser,
741 DATA_BLOB password,
742 const char *pdev,
743 NTSTATUS *pstatus)
744{
745 connection_struct *conn = NULL;
746 struct smb_filename *smb_fname_cpath = NULL;
747 fstring dev;
748 int ret;
749 bool on_err_call_dis_hook = false;
750 bool claimed_connection = false;
751 uid_t effuid;
752 gid_t effgid;
753 NTSTATUS status;
754
755 fstrcpy(dev, pdev);
756
757 *pstatus = share_sanity_checks(&sconn->client_id, snum, dev);
758 if (NT_STATUS_IS_ERR(*pstatus)) {
759 goto err_root_exit;
760 }
761
762 conn = conn_new(sconn);
763 if (!conn) {
764 DEBUG(0,("Couldn't find free connection.\n"));
765 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
766 goto err_root_exit;
767 }
768
769 conn->params->service = snum;
770
771 status = create_connection_session_info(sconn,
772 conn, snum, vuser ? vuser->session_info : NULL, password,
773 &conn->session_info);
774
775 if (!NT_STATUS_IS_OK(status)) {
776 DEBUG(1, ("create_connection_session_info failed: %s\n",
777 nt_errstr(status)));
778 *pstatus = status;
779 goto err_root_exit;
780 }
781
782 if ((lp_guest_only(snum)) || (lp_security() == SEC_SHARE)) {
783 conn->force_user = true;
784 }
785
786 add_session_user(sconn, conn->session_info->unix_name);
787
788 conn->num_files_open = 0;
789 conn->lastused = conn->lastused_count = time(NULL);
790 conn->used = True;
791 conn->printer = (strncmp(dev,"LPT",3) == 0);
792 conn->ipc = ( (strncmp(dev,"IPC",3) == 0) ||
793 ( lp_enable_asu_support() && strequal(dev,"ADMIN$")) );
794
795 /* Case options for the share. */
796 if (lp_casesensitive(snum) == Auto) {
797 /* We will be setting this per packet. Set to be case
798 * insensitive for now. */
799 conn->case_sensitive = False;
800 } else {
801 conn->case_sensitive = (bool)lp_casesensitive(snum);
802 }
803
804 conn->case_preserve = lp_preservecase(snum);
805 conn->short_case_preserve = lp_shortpreservecase(snum);
806
807 conn->encrypt_level = lp_smb_encrypt(snum);
808
809 conn->veto_list = NULL;
810 conn->hide_list = NULL;
811 conn->veto_oplock_list = NULL;
812 conn->aio_write_behind_list = NULL;
813
814 conn->read_only = lp_readonly(SNUM(conn));
815
816 status = set_conn_force_user_group(conn, snum);
817 if (!NT_STATUS_IS_OK(status)) {
818 conn_free(conn);
819 *pstatus = status;
820 return NULL;
821 }
822
823 conn->vuid = (vuser != NULL) ? vuser->vuid : UID_FIELD_INVALID;
824
825 {
826 char *s = talloc_sub_advanced(talloc_tos(),
827 lp_servicename(SNUM(conn)),
828 conn->session_info->unix_name,
829 conn->connectpath,
830 conn->session_info->utok.gid,
831 conn->session_info->sanitized_username,
832 conn->session_info->info3->base.domain.string,
833 lp_pathname(snum));
834 if (!s) {
835 *pstatus = NT_STATUS_NO_MEMORY;
836 goto err_root_exit;
837 }
838
839 if (!set_conn_connectpath(conn,s)) {
840 TALLOC_FREE(s);
841 *pstatus = NT_STATUS_NO_MEMORY;
842 goto err_root_exit;
843 }
844 DEBUG(3,("Connect path is '%s' for service [%s]\n",s,
845 lp_servicename(snum)));
846 TALLOC_FREE(s);
847 }
848
849 /*
850 * New code to check if there's a share security descripter
851 * added from NT server manager. This is done after the
852 * smb.conf checks are done as we need a uid and token. JRA.
853 *
854 */
855
856 share_access_check(conn->session_info->security_token,
857 lp_servicename(snum), MAXIMUM_ALLOWED_ACCESS,
858 &conn->share_access);
859
860 if ((conn->share_access & FILE_WRITE_DATA) == 0) {
861 if ((conn->share_access & FILE_READ_DATA) == 0) {
862 /* No access, read or write. */
863 DEBUG(0,("make_connection: connection to %s "
864 "denied due to security "
865 "descriptor.\n",
866 lp_servicename(snum)));
867 *pstatus = NT_STATUS_ACCESS_DENIED;
868 goto err_root_exit;
869 } else {
870 conn->read_only = True;
871 }
872 }
873 /* Initialise VFS function pointers */
874
875 if (!smbd_vfs_init(conn)) {
876 DEBUG(0, ("vfs_init failed for service %s\n",
877 lp_servicename(snum)));
878 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
879 goto err_root_exit;
880 }
881
882/* ROOT Activities: */
883 /* explicitly check widelinks here so that we can correctly warn
884 * in the logs. */
885 widelinks_warning(snum);
886
887 /*
888 * Enforce the max connections parameter.
889 */
890
891 if ((lp_max_connections(snum) > 0)
892 && (count_current_connections(lp_servicename(SNUM(conn)), True) >=
893 lp_max_connections(snum))) {
894
895 DEBUG(1, ("Max connections (%d) exceeded for %s\n",
896 lp_max_connections(snum), lp_servicename(snum)));
897 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
898 goto err_root_exit;
899 }
900
901 /*
902 * Get us an entry in the connections db
903 */
904 if (!claim_connection(conn, lp_servicename(snum))) {
905 DEBUG(1, ("Could not store connections entry\n"));
906 *pstatus = NT_STATUS_INTERNAL_DB_ERROR;
907 goto err_root_exit;
908 }
909 claimed_connection = true;
910
911 /* Invoke VFS make connection hook - this must be the first
912 filesystem operation that we do. */
913
914 if (SMB_VFS_CONNECT(conn, lp_servicename(snum),
915 conn->session_info->unix_name) < 0) {
916 DEBUG(0,("make_connection: VFS make connection failed!\n"));
917 *pstatus = NT_STATUS_UNSUCCESSFUL;
918 goto err_root_exit;
919 }
920
921 /* Any error exit after here needs to call the disconnect hook. */
922 on_err_call_dis_hook = true;
923
924 if ((!conn->printer) && (!conn->ipc)) {
925 conn->notify_ctx = notify_init(conn,
926 sconn_server_id(sconn),
927 sconn->msg_ctx,
928 smbd_event_context(),
929 conn);
930 }
931
932 /*
933 * Fix compatibility issue pointed out by Volker.
934 * We pass the conn->connectpath to the preexec
935 * scripts as a parameter, so attempt to canonicalize
936 * it here before calling the preexec scripts.
937 * We ignore errors here, as it is possible that
938 * the conn->connectpath doesn't exist yet and
939 * the preexec scripts will create them.
940 */
941
942 (void)canonicalize_connect_path(conn);
943
944 /* Preexecs are done here as they might make the dir we are to ChDir
945 * to below */
946 /* execute any "root preexec = " line */
947 if (*lp_rootpreexec(snum)) {
948 char *cmd = talloc_sub_advanced(talloc_tos(),
949 lp_servicename(SNUM(conn)),
950 conn->session_info->unix_name,
951 conn->connectpath,
952 conn->session_info->utok.gid,
953 conn->session_info->sanitized_username,
954 conn->session_info->info3->base.domain.string,
955 lp_rootpreexec(snum));
956 DEBUG(5,("cmd=%s\n",cmd));
957 ret = smbrun(cmd,NULL);
958 TALLOC_FREE(cmd);
959 if (ret != 0 && lp_rootpreexec_close(snum)) {
960 DEBUG(1,("root preexec gave %d - failing "
961 "connection\n", ret));
962 *pstatus = NT_STATUS_ACCESS_DENIED;
963 goto err_root_exit;
964 }
965 }
966
967/* USER Activites: */
968 if (!change_to_user(conn, conn->vuid)) {
969 /* No point continuing if they fail the basic checks */
970 DEBUG(0,("Can't become connected user!\n"));
971 *pstatus = NT_STATUS_LOGON_FAILURE;
972 goto err_root_exit;
973 }
974
975 effuid = geteuid();
976 effgid = getegid();
977
978 /* Remember that a different vuid can connect later without these
979 * checks... */
980
981 /* Preexecs are done here as they might make the dir we are to ChDir
982 * to below */
983
984 /* execute any "preexec = " line */
985 if (*lp_preexec(snum)) {
986 char *cmd = talloc_sub_advanced(talloc_tos(),
987 lp_servicename(SNUM(conn)),
988 conn->session_info->unix_name,
989 conn->connectpath,
990 conn->session_info->utok.gid,
991 conn->session_info->sanitized_username,
992 conn->session_info->info3->base.domain.string,
993 lp_preexec(snum));
994 ret = smbrun(cmd,NULL);
995 TALLOC_FREE(cmd);
996 if (ret != 0 && lp_preexec_close(snum)) {
997 DEBUG(1,("preexec gave %d - failing connection\n",
998 ret));
999 *pstatus = NT_STATUS_ACCESS_DENIED;
1000 goto err_root_exit;
1001 }
1002 }
1003
1004#ifdef WITH_FAKE_KASERVER
1005 if (lp_afs_share(snum)) {
1006 afs_login(conn);
1007 }
1008#endif
1009
1010 /*
1011 * we've finished with the user stuff - go back to root
1012 * so the SMB_VFS_STAT call will only fail on path errors,
1013 * not permission problems.
1014 */
1015 change_to_root_user();
1016/* ROOT Activites: */
1017
1018 /*
1019 * If widelinks are disallowed we need to canonicalise the connect
1020 * path here to ensure we don't have any symlinks in the
1021 * connectpath. We will be checking all paths on this connection are
1022 * below this directory. We must do this after the VFS init as we
1023 * depend on the realpath() pointer in the vfs table. JRA.
1024 */
1025 if (!lp_widelinks(snum)) {
1026 if (!canonicalize_connect_path(conn)) {
1027 DEBUG(0, ("canonicalize_connect_path failed "
1028 "for service %s, path %s\n",
1029 lp_servicename(snum),
1030 conn->connectpath));
1031 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
1032 goto err_root_exit;
1033 }
1034 }
1035
1036 /* Add veto/hide lists */
1037 if (!IS_IPC(conn) && !IS_PRINT(conn)) {
1038 set_namearray( &conn->veto_list, lp_veto_files(snum));
1039 set_namearray( &conn->hide_list, lp_hide_files(snum));
1040 set_namearray( &conn->veto_oplock_list, lp_veto_oplocks(snum));
1041 set_namearray( &conn->aio_write_behind_list,
1042 lp_aio_write_behind(snum));
1043 }
1044 status = create_synthetic_smb_fname(talloc_tos(), conn->connectpath,
1045 NULL, NULL, &smb_fname_cpath);
1046 if (!NT_STATUS_IS_OK(status)) {
1047 *pstatus = status;
1048 goto err_root_exit;
1049 }
1050
1051 /* win2000 does not check the permissions on the directory
1052 during the tree connect, instead relying on permission
1053 check during individual operations. To match this behaviour
1054 I have disabled this chdir check (tridge) */
1055 /* the alternative is just to check the directory exists */
1056
1057 if ((ret = SMB_VFS_STAT(conn, smb_fname_cpath)) != 0 ||
1058 !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
1059 if (ret == 0 && !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
1060 DEBUG(0,("'%s' is not a directory, when connecting to "
1061 "[%s]\n", conn->connectpath,
1062 lp_servicename(snum)));
1063 } else {
1064 DEBUG(0,("'%s' does not exist or permission denied "
1065 "when connecting to [%s] Error was %s\n",
1066 conn->connectpath, lp_servicename(snum),
1067 strerror(errno) ));
1068 }
1069 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
1070 goto err_root_exit;
1071 }
1072 conn->base_share_dev = smb_fname_cpath->st.st_ex_dev;
1073
1074 string_set(&conn->origpath,conn->connectpath);
1075
1076 /* Figure out the characteristics of the underlying filesystem. This
1077 * assumes that all the filesystem mounted withing a share path have
1078 * the same characteristics, which is likely but not guaranteed.
1079 */
1080
1081 conn->fs_capabilities = SMB_VFS_FS_CAPABILITIES(conn, &conn->ts_res);
1082
1083 /*
1084 * Print out the 'connected as' stuff here as we need
1085 * to know the effective uid and gid we will be using
1086 * (at least initially).
1087 */
1088
1089 if( DEBUGLVL( IS_IPC(conn) ? 3 : 1 ) ) {
1090 dbgtext( "%s (%s) ", get_remote_machine_name(),
1091 conn->sconn->client_id.addr );
1092 dbgtext( "%s", srv_is_signing_active(sconn) ? "signed " : "");
1093 dbgtext( "connect to service %s ", lp_servicename(snum) );
1094 dbgtext( "initially as user %s ",
1095 conn->session_info->unix_name );
1096 dbgtext( "(uid=%d, gid=%d) ", (int)effuid, (int)effgid );
1097 dbgtext( "(pid %d)\n", (int)sys_getpid() );
1098 }
1099
1100 return(conn);
1101
1102 err_root_exit:
1103 TALLOC_FREE(smb_fname_cpath);
1104 /* We must exit this function as root. */
1105 if (geteuid() != 0) {
1106 change_to_root_user();
1107 }
1108 if (on_err_call_dis_hook) {
1109 /* Call VFS disconnect hook */
1110 SMB_VFS_DISCONNECT(conn);
1111 }
1112 if (claimed_connection) {
1113 yield_connection(conn, lp_servicename(snum));
1114 }
1115 if (conn) {
1116 conn_free(conn);
1117 }
1118 return NULL;
1119}
1120
1121/****************************************************************************
1122 Make a connection to a service.
1123 *
1124 * @param service
1125****************************************************************************/
1126
1127connection_struct *make_connection(struct smbd_server_connection *sconn,
1128 const char *service_in, DATA_BLOB password,
1129 const char *pdev, uint16 vuid,
1130 NTSTATUS *status)
1131{
1132 uid_t euid;
1133 user_struct *vuser = NULL;
1134 char *service = NULL;
1135 fstring dev;
1136 int snum = -1;
1137
1138 fstrcpy(dev, pdev);
1139
1140 /* This must ONLY BE CALLED AS ROOT. As it exits this function as
1141 * root. */
1142 if (!non_root_mode() && (euid = geteuid()) != 0) {
1143 DEBUG(0,("make_connection: PANIC ERROR. Called as nonroot "
1144 "(%u)\n", (unsigned int)euid ));
1145 smb_panic("make_connection: PANIC ERROR. Called as nonroot\n");
1146 }
1147
1148 if (conn_num_open(sconn) > 2047) {
1149 *status = NT_STATUS_INSUFF_SERVER_RESOURCES;
1150 return NULL;
1151 }
1152
1153 if(lp_security() != SEC_SHARE) {
1154 vuser = get_valid_user_struct(sconn, vuid);
1155 if (!vuser) {
1156 DEBUG(1,("make_connection: refusing to connect with "
1157 "no session setup\n"));
1158 *status = NT_STATUS_ACCESS_DENIED;
1159 return NULL;
1160 }
1161 }
1162
1163 /* Logic to try and connect to the correct [homes] share, preferably
1164 without too many getpwnam() lookups. This is particulary nasty for
1165 winbind usernames, where the share name isn't the same as unix
1166 username.
1167
1168 The snum of the homes share is stored on the vuser at session setup
1169 time.
1170 */
1171
1172 if (strequal(service_in,HOMES_NAME)) {
1173 if(lp_security() != SEC_SHARE) {
1174 DATA_BLOB no_pw = data_blob_null;
1175 if (vuser->homes_snum == -1) {
1176 DEBUG(2, ("[homes] share not available for "
1177 "this user because it was not found "
1178 "or created at session setup "
1179 "time\n"));
1180 *status = NT_STATUS_BAD_NETWORK_NAME;
1181 return NULL;
1182 }
1183 DEBUG(5, ("making a connection to [homes] service "
1184 "created at session setup time\n"));
1185 return make_connection_snum(sconn,
1186 vuser->homes_snum,
1187 vuser, no_pw,
1188 dev, status);
1189 } else {
1190 /* Security = share. Try with
1191 * current_user_info.smb_name as the username. */
1192 if (*current_user_info.smb_name) {
1193 char *unix_username = NULL;
1194 (void)map_username(talloc_tos(),
1195 current_user_info.smb_name,
1196 &unix_username);
1197 snum = find_service(talloc_tos(),
1198 unix_username,
1199 &unix_username);
1200 if (!unix_username) {
1201 *status = NT_STATUS_NO_MEMORY;
1202 }
1203 return NULL;
1204 }
1205 if (snum != -1) {
1206 DEBUG(5, ("making a connection to 'homes' "
1207 "service %s based on "
1208 "security=share\n", service_in));
1209 return make_connection_snum(sconn,
1210 snum, NULL,
1211 password,
1212 dev, status);
1213 }
1214 }
1215 } else if ((lp_security() != SEC_SHARE) && (vuser->homes_snum != -1)
1216 && strequal(service_in,
1217 lp_servicename(vuser->homes_snum))) {
1218 DATA_BLOB no_pw = data_blob_null;
1219 DEBUG(5, ("making a connection to 'homes' service [%s] "
1220 "created at session setup time\n", service_in));
1221 return make_connection_snum(sconn,
1222 vuser->homes_snum,
1223 vuser, no_pw,
1224 dev, status);
1225 }
1226
1227 service = talloc_strdup(talloc_tos(), service_in);
1228 if (!service) {
1229 *status = NT_STATUS_NO_MEMORY;
1230 return NULL;
1231 }
1232
1233 strlower_m(service);
1234
1235 snum = find_service(talloc_tos(), service, &service);
1236 if (!service) {
1237 *status = NT_STATUS_NO_MEMORY;
1238 return NULL;
1239 }
1240
1241 if (snum < 0) {
1242 if (strequal(service,"IPC$") ||
1243 (lp_enable_asu_support() && strequal(service,"ADMIN$"))) {
1244 DEBUG(3,("refusing IPC connection to %s\n", service));
1245 *status = NT_STATUS_ACCESS_DENIED;
1246 return NULL;
1247 }
1248
1249 DEBUG(3,("%s (%s) couldn't find service %s\n",
1250 get_remote_machine_name(),
1251 tsocket_address_string(
1252 sconn->remote_address, talloc_tos()),
1253 service));
1254 *status = NT_STATUS_BAD_NETWORK_NAME;
1255 return NULL;
1256 }
1257
1258 /* Handle non-Dfs clients attempting connections to msdfs proxy */
1259 if (lp_host_msdfs() && (*lp_msdfs_proxy(snum) != '\0')) {
1260 DEBUG(3, ("refusing connection to dfs proxy share '%s' "
1261 "(pointing to %s)\n",
1262 service, lp_msdfs_proxy(snum)));
1263 *status = NT_STATUS_BAD_NETWORK_NAME;
1264 return NULL;
1265 }
1266
1267 DEBUG(5, ("making a connection to 'normal' service %s\n", service));
1268
1269 return make_connection_snum(sconn, snum, vuser,
1270 password,
1271 dev, status);
1272}
1273
1274/****************************************************************************
1275 Close a cnum.
1276****************************************************************************/
1277
1278void close_cnum(connection_struct *conn, uint16 vuid)
1279{
1280 file_close_conn(conn);
1281
1282 if (!IS_IPC(conn)) {
1283 dptr_closecnum(conn);
1284 }
1285
1286 change_to_root_user();
1287
1288 DEBUG(IS_IPC(conn)?3:1, ("%s (%s) closed connection to service %s\n",
1289 get_remote_machine_name(),
1290 conn->sconn->client_id.addr,
1291 lp_servicename(SNUM(conn))));
1292
1293 /* Call VFS disconnect hook */
1294 SMB_VFS_DISCONNECT(conn);
1295
1296 yield_connection(conn, lp_servicename(SNUM(conn)));
1297
1298 /* make sure we leave the directory available for unmount */
1299 vfs_ChDir(conn, "/");
1300
1301 /* execute any "postexec = " line */
1302 if (*lp_postexec(SNUM(conn)) &&
1303 change_to_user(conn, vuid)) {
1304 char *cmd = talloc_sub_advanced(talloc_tos(),
1305 lp_servicename(SNUM(conn)),
1306 conn->session_info->unix_name,
1307 conn->connectpath,
1308 conn->session_info->utok.gid,
1309 conn->session_info->sanitized_username,
1310 conn->session_info->info3->base.domain.string,
1311 lp_postexec(SNUM(conn)));
1312 smbrun(cmd,NULL);
1313 TALLOC_FREE(cmd);
1314 change_to_root_user();
1315 }
1316
1317 change_to_root_user();
1318 /* execute any "root postexec = " line */
1319 if (*lp_rootpostexec(SNUM(conn))) {
1320 char *cmd = talloc_sub_advanced(talloc_tos(),
1321 lp_servicename(SNUM(conn)),
1322 conn->session_info->unix_name,
1323 conn->connectpath,
1324 conn->session_info->utok.gid,
1325 conn->session_info->sanitized_username,
1326 conn->session_info->info3->base.domain.string,
1327 lp_rootpostexec(SNUM(conn)));
1328 smbrun(cmd,NULL);
1329 TALLOC_FREE(cmd);
1330 }
1331
1332 conn_free(conn);
1333}
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