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libcli/smbreadline/smbreadline.h: fix licence/copyright
[Samba.git] / source3 / smbd / service.c
bloba8cd756f38ddb77c8b1b1cf875fe613fcfb6a2d5
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
31 extern userdom_struct current_user_info;
32
33 static 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
51 bool 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
173 bool 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
225 static 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
246 void 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
262 int 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
305 int 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
456 static 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
504 static 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
594 static 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
672 NTSTATUS 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
739 connection_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 {
857 bool can_write = False;
858
859 can_write = share_access_check(conn->session_info->security_token,
860 lp_servicename(snum),
861 FILE_WRITE_DATA);
862
863 if (!can_write) {
864 if (!share_access_check(conn->session_info->security_token,
865 lp_servicename(snum),
866 FILE_READ_DATA)) {
867 /* No access, read or write. */
868 DEBUG(0,("make_connection: connection to %s "
869 "denied due to security "
870 "descriptor.\n",
871 lp_servicename(snum)));
872 *pstatus = NT_STATUS_ACCESS_DENIED;
873 goto err_root_exit;
874 } else {
875 conn->read_only = True;
876 }
877 }
878 }
879 /* Initialise VFS function pointers */
880
881 if (!smbd_vfs_init(conn)) {
882 DEBUG(0, ("vfs_init failed for service %s\n",
883 lp_servicename(snum)));
884 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
885 goto err_root_exit;
886 }
887
888 /* ROOT Activities: */
889 /* explicitly check widelinks here so that we can correctly warn
890 * in the logs. */
891 widelinks_warning(snum);
892
893 /*
894 * Enforce the max connections parameter.
895 */
896
897 if ((lp_max_connections(snum) > 0)
898 && (count_current_connections(lp_servicename(SNUM(conn)), True) >=
899 lp_max_connections(snum))) {
900
901 DEBUG(1, ("Max connections (%d) exceeded for %s\n",
902 lp_max_connections(snum), lp_servicename(snum)));
903 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
904 goto err_root_exit;
905 }
906
907 /*
908 * Get us an entry in the connections db
909 */
910 if (!claim_connection(conn, lp_servicename(snum))) {
911 DEBUG(1, ("Could not store connections entry\n"));
912 *pstatus = NT_STATUS_INTERNAL_DB_ERROR;
913 goto err_root_exit;
914 }
915 claimed_connection = true;
916
917 /* Invoke VFS make connection hook - this must be the first
918 filesystem operation that we do. */
919
920 if (SMB_VFS_CONNECT(conn, lp_servicename(snum),
921 conn->session_info->unix_name) < 0) {
922 DEBUG(0,("make_connection: VFS make connection failed!\n"));
923 *pstatus = NT_STATUS_UNSUCCESSFUL;
924 goto err_root_exit;
925 }
926
927 /* Any error exit after here needs to call the disconnect hook. */
928 on_err_call_dis_hook = true;
929
930 if ((!conn->printer) && (!conn->ipc)) {
931 conn->notify_ctx = notify_init(conn,
932 sconn_server_id(sconn),
933 sconn->msg_ctx,
934 smbd_event_context(),
935 conn);
936 }
937
938 /*
939 * Fix compatibility issue pointed out by Volker.
940 * We pass the conn->connectpath to the preexec
941 * scripts as a parameter, so attempt to canonicalize
942 * it here before calling the preexec scripts.
943 * We ignore errors here, as it is possible that
944 * the conn->connectpath doesn't exist yet and
945 * the preexec scripts will create them.
946 */
947
948 (void)canonicalize_connect_path(conn);
949
950 /* Preexecs are done here as they might make the dir we are to ChDir
951 * to below */
952 /* execute any "root preexec = " line */
953 if (*lp_rootpreexec(snum)) {
954 char *cmd = talloc_sub_advanced(talloc_tos(),
955 lp_servicename(SNUM(conn)),
956 conn->session_info->unix_name,
957 conn->connectpath,
958 conn->session_info->utok.gid,
959 conn->session_info->sanitized_username,
960 conn->session_info->info3->base.domain.string,
961 lp_rootpreexec(snum));
962 DEBUG(5,("cmd=%s\n",cmd));
963 ret = smbrun(cmd,NULL);
964 TALLOC_FREE(cmd);
965 if (ret != 0 && lp_rootpreexec_close(snum)) {
966 DEBUG(1,("root preexec gave %d - failing "
967 "connection\n", ret));
968 *pstatus = NT_STATUS_ACCESS_DENIED;
969 goto err_root_exit;
970 }
971 }
972
973 /* USER Activites: */
974 if (!change_to_user(conn, conn->vuid)) {
975 /* No point continuing if they fail the basic checks */
976 DEBUG(0,("Can't become connected user!\n"));
977 *pstatus = NT_STATUS_LOGON_FAILURE;
978 goto err_root_exit;
979 }
980
981 effuid = geteuid();
982 effgid = getegid();
983
984 /* Remember that a different vuid can connect later without these
985 * checks... */
986
987 /* Preexecs are done here as they might make the dir we are to ChDir
988 * to below */
989
990 /* execute any "preexec = " line */
991 if (*lp_preexec(snum)) {
992 char *cmd = talloc_sub_advanced(talloc_tos(),
993 lp_servicename(SNUM(conn)),
994 conn->session_info->unix_name,
995 conn->connectpath,
996 conn->session_info->utok.gid,
997 conn->session_info->sanitized_username,
998 conn->session_info->info3->base.domain.string,
999 lp_preexec(snum));
1000 ret = smbrun(cmd,NULL);
1001 TALLOC_FREE(cmd);
1002 if (ret != 0 && lp_preexec_close(snum)) {
1003 DEBUG(1,("preexec gave %d - failing connection\n",
1004 ret));
1005 *pstatus = NT_STATUS_ACCESS_DENIED;
1006 goto err_root_exit;
1007 }
1008 }
1009
1010 #ifdef WITH_FAKE_KASERVER
1011 if (lp_afs_share(snum)) {
1012 afs_login(conn);
1013 }
1014 #endif
1015
1016 /*
1017 * we've finished with the user stuff - go back to root
1018 * so the SMB_VFS_STAT call will only fail on path errors,
1019 * not permission problems.
1020 */
1021 change_to_root_user();
1022 /* ROOT Activites: */
1023
1024 /*
1025 * If widelinks are disallowed we need to canonicalise the connect
1026 * path here to ensure we don't have any symlinks in the
1027 * connectpath. We will be checking all paths on this connection are
1028 * below this directory. We must do this after the VFS init as we
1029 * depend on the realpath() pointer in the vfs table. JRA.
1030 */
1031 if (!lp_widelinks(snum)) {
1032 if (!canonicalize_connect_path(conn)) {
1033 DEBUG(0, ("canonicalize_connect_path failed "
1034 "for service %s, path %s\n",
1035 lp_servicename(snum),
1036 conn->connectpath));
1037 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
1038 goto err_root_exit;
1039 }
1040 }
1041
1042 /* Add veto/hide lists */
1043 if (!IS_IPC(conn) && !IS_PRINT(conn)) {
1044 set_namearray( &conn->veto_list, lp_veto_files(snum));
1045 set_namearray( &conn->hide_list, lp_hide_files(snum));
1046 set_namearray( &conn->veto_oplock_list, lp_veto_oplocks(snum));
1047 set_namearray( &conn->aio_write_behind_list,
1048 lp_aio_write_behind(snum));
1049 }
1050 status = create_synthetic_smb_fname(talloc_tos(), conn->connectpath,
1051 NULL, NULL, &smb_fname_cpath);
1052 if (!NT_STATUS_IS_OK(status)) {
1053 *pstatus = status;
1054 goto err_root_exit;
1055 }
1056
1057 /* win2000 does not check the permissions on the directory
1058 during the tree connect, instead relying on permission
1059 check during individual operations. To match this behaviour
1060 I have disabled this chdir check (tridge) */
1061 /* the alternative is just to check the directory exists */
1062
1063 if ((ret = SMB_VFS_STAT(conn, smb_fname_cpath)) != 0 ||
1064 !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
1065 if (ret == 0 && !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
1066 DEBUG(0,("'%s' is not a directory, when connecting to "
1067 "[%s]\n", conn->connectpath,
1068 lp_servicename(snum)));
1069 } else {
1070 DEBUG(0,("'%s' does not exist or permission denied "
1071 "when connecting to [%s] Error was %s\n",
1072 conn->connectpath, lp_servicename(snum),
1073 strerror(errno) ));
1074 }
1075 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
1076 goto err_root_exit;
1077 }
1078 conn->base_share_dev = smb_fname_cpath->st.st_ex_dev;
1079
1080 string_set(&conn->origpath,conn->connectpath);
1081
1082 /* Figure out the characteristics of the underlying filesystem. This
1083 * assumes that all the filesystem mounted withing a share path have
1084 * the same characteristics, which is likely but not guaranteed.
1085 */
1086
1087 conn->fs_capabilities = SMB_VFS_FS_CAPABILITIES(conn, &conn->ts_res);
1088
1089 /*
1090 * Print out the 'connected as' stuff here as we need
1091 * to know the effective uid and gid we will be using
1092 * (at least initially).
1093 */
1094
1095 if( DEBUGLVL( IS_IPC(conn) ? 3 : 1 ) ) {
1096 dbgtext( "%s (%s) ", get_remote_machine_name(),
1097 conn->sconn->client_id.addr );
1098 dbgtext( "%s", srv_is_signing_active(sconn) ? "signed " : "");
1099 dbgtext( "connect to service %s ", lp_servicename(snum) );
1100 dbgtext( "initially as user %s ",
1101 conn->session_info->unix_name );
1102 dbgtext( "(uid=%d, gid=%d) ", (int)effuid, (int)effgid );
1103 dbgtext( "(pid %d)\n", (int)sys_getpid() );
1104 }
1105
1106 return(conn);
1107
1108 err_root_exit:
1109 TALLOC_FREE(smb_fname_cpath);
1110 /* We must exit this function as root. */
1111 if (geteuid() != 0) {
1112 change_to_root_user();
1113 }
1114 if (on_err_call_dis_hook) {
1115 /* Call VFS disconnect hook */
1116 SMB_VFS_DISCONNECT(conn);
1117 }
1118 if (claimed_connection) {
1119 yield_connection(conn, lp_servicename(snum));
1120 }
1121 if (conn) {
1122 conn_free(conn);
1123 }
1124 return NULL;
1125 }
1126
1127 /****************************************************************************
1128 Make a connection to a service.
1129 *
1130 * @param service
1131 ****************************************************************************/
1132
1133 connection_struct *make_connection(struct smbd_server_connection *sconn,
1134 const char *service_in, DATA_BLOB password,
1135 const char *pdev, uint16 vuid,
1136 NTSTATUS *status)
1137 {
1138 uid_t euid;
1139 user_struct *vuser = NULL;
1140 char *service = NULL;
1141 fstring dev;
1142 int snum = -1;
1143
1144 fstrcpy(dev, pdev);
1145
1146 /* This must ONLY BE CALLED AS ROOT. As it exits this function as
1147 * root. */
1148 if (!non_root_mode() && (euid = geteuid()) != 0) {
1149 DEBUG(0,("make_connection: PANIC ERROR. Called as nonroot "
1150 "(%u)\n", (unsigned int)euid ));
1151 smb_panic("make_connection: PANIC ERROR. Called as nonroot\n");
1152 }
1153
1154 if (conn_num_open(sconn) > 2047) {
1155 *status = NT_STATUS_INSUFF_SERVER_RESOURCES;
1156 return NULL;
1157 }
1158
1159 if(lp_security() != SEC_SHARE) {
1160 vuser = get_valid_user_struct(sconn, vuid);
1161 if (!vuser) {
1162 DEBUG(1,("make_connection: refusing to connect with "
1163 "no session setup\n"));
1164 *status = NT_STATUS_ACCESS_DENIED;
1165 return NULL;
1166 }
1167 }
1168
1169 /* Logic to try and connect to the correct [homes] share, preferably
1170 without too many getpwnam() lookups. This is particulary nasty for
1171 winbind usernames, where the share name isn't the same as unix
1172 username.
1173
1174 The snum of the homes share is stored on the vuser at session setup
1175 time.
1176 */
1177
1178 if (strequal(service_in,HOMES_NAME)) {
1179 if(lp_security() != SEC_SHARE) {
1180 DATA_BLOB no_pw = data_blob_null;
1181 if (vuser->homes_snum == -1) {
1182 DEBUG(2, ("[homes] share not available for "
1183 "this user because it was not found "
1184 "or created at session setup "
1185 "time\n"));
1186 *status = NT_STATUS_BAD_NETWORK_NAME;
1187 return NULL;
1188 }
1189 DEBUG(5, ("making a connection to [homes] service "
1190 "created at session setup time\n"));
1191 return make_connection_snum(sconn,
1192 vuser->homes_snum,
1193 vuser, no_pw,
1194 dev, status);
1195 } else {
1196 /* Security = share. Try with
1197 * current_user_info.smb_name as the username. */
1198 if (*current_user_info.smb_name) {
1199 char *unix_username = NULL;
1200 (void)map_username(talloc_tos(),
1201 current_user_info.smb_name,
1202 &unix_username);
1203 snum = find_service(talloc_tos(),
1204 unix_username,
1205 &unix_username);
1206 if (!unix_username) {
1207 *status = NT_STATUS_NO_MEMORY;
1208 }
1209 return NULL;
1210 }
1211 if (snum != -1) {
1212 DEBUG(5, ("making a connection to 'homes' "
1213 "service %s based on "
1214 "security=share\n", service_in));
1215 return make_connection_snum(sconn,
1216 snum, NULL,
1217 password,
1218 dev, status);
1219 }
1220 }
1221 } else if ((lp_security() != SEC_SHARE) && (vuser->homes_snum != -1)
1222 && strequal(service_in,
1223 lp_servicename(vuser->homes_snum))) {
1224 DATA_BLOB no_pw = data_blob_null;
1225 DEBUG(5, ("making a connection to 'homes' service [%s] "
1226 "created at session setup time\n", service_in));
1227 return make_connection_snum(sconn,
1228 vuser->homes_snum,
1229 vuser, no_pw,
1230 dev, status);
1231 }
1232
1233 service = talloc_strdup(talloc_tos(), service_in);
1234 if (!service) {
1235 *status = NT_STATUS_NO_MEMORY;
1236 return NULL;
1237 }
1238
1239 strlower_m(service);
1240
1241 snum = find_service(talloc_tos(), service, &service);
1242 if (!service) {
1243 *status = NT_STATUS_NO_MEMORY;
1244 return NULL;
1245 }
1246
1247 if (snum < 0) {
1248 if (strequal(service,"IPC$") ||
1249 (lp_enable_asu_support() && strequal(service,"ADMIN$"))) {
1250 DEBUG(3,("refusing IPC connection to %s\n", service));
1251 *status = NT_STATUS_ACCESS_DENIED;
1252 return NULL;
1253 }
1254
1255 DEBUG(3,("%s (%s) couldn't find service %s\n",
1256 get_remote_machine_name(),
1257 tsocket_address_string(
1258 sconn->remote_address, talloc_tos()),
1259 service));
1260 *status = NT_STATUS_BAD_NETWORK_NAME;
1261 return NULL;
1262 }
1263
1264 /* Handle non-Dfs clients attempting connections to msdfs proxy */
1265 if (lp_host_msdfs() && (*lp_msdfs_proxy(snum) != '\0')) {
1266 DEBUG(3, ("refusing connection to dfs proxy share '%s' "
1267 "(pointing to %s)\n",
1268 service, lp_msdfs_proxy(snum)));
1269 *status = NT_STATUS_BAD_NETWORK_NAME;
1270 return NULL;
1271 }
1272
1273 DEBUG(5, ("making a connection to 'normal' service %s\n", service));
1274
1275 return make_connection_snum(sconn, snum, vuser,
1276 password,
1277 dev, status);
1278 }
1279
1280 /****************************************************************************
1281 Close a cnum.
1282 ****************************************************************************/
1283
1284 void close_cnum(connection_struct *conn, uint16 vuid)
1285 {
1286 file_close_conn(conn);
1287
1288 if (!IS_IPC(conn)) {
1289 dptr_closecnum(conn);
1290 }
1291
1292 change_to_root_user();
1293
1294 DEBUG(IS_IPC(conn)?3:1, ("%s (%s) closed connection to service %s\n",
1295 get_remote_machine_name(),
1296 conn->sconn->client_id.addr,
1297 lp_servicename(SNUM(conn))));
1298
1299 /* Call VFS disconnect hook */
1300 SMB_VFS_DISCONNECT(conn);
1301
1302 yield_connection(conn, lp_servicename(SNUM(conn)));
1303
1304 /* make sure we leave the directory available for unmount */
1305 vfs_ChDir(conn, "/");
1306
1307 /* execute any "postexec = " line */
1308 if (*lp_postexec(SNUM(conn)) &&
1309 change_to_user(conn, vuid)) {
1310 char *cmd = talloc_sub_advanced(talloc_tos(),
1311 lp_servicename(SNUM(conn)),
1312 conn->session_info->unix_name,
1313 conn->connectpath,
1314 conn->session_info->utok.gid,
1315 conn->session_info->sanitized_username,
1316 conn->session_info->info3->base.domain.string,
1317 lp_postexec(SNUM(conn)));
1318 smbrun(cmd,NULL);
1319 TALLOC_FREE(cmd);
1320 change_to_root_user();
1321 }
1322
1323 change_to_root_user();
1324 /* execute any "root postexec = " line */
1325 if (*lp_rootpostexec(SNUM(conn))) {
1326 char *cmd = talloc_sub_advanced(talloc_tos(),
1327 lp_servicename(SNUM(conn)),
1328 conn->session_info->unix_name,
1329 conn->connectpath,
1330 conn->session_info->utok.gid,
1331 conn->session_info->sanitized_username,
1332 conn->session_info->info3->base.domain.string,
1333 lp_rootpostexec(SNUM(conn)));
1334 smbrun(cmd,NULL);
1335 TALLOC_FREE(cmd);
1336 }
1337
1338 conn_free(conn);
1339 }
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