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s3-printing: follow force user/group for driver IO
[Samba.git] / source3 / smbd / service.c
blob00b5294be66843c07f62acdcc217ea45ddbbb96e
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 "smbd/globals.h"
22 #include "../librpc/gen_ndr/netlogon.h"
23 #include "../libcli/security/security.h"
24 #include "printing/pcap.h"
25
26 extern userdom_struct current_user_info;
27
28 static bool canonicalize_connect_path(connection_struct *conn)
29 {
30 bool ret;
31 char *resolved_name = SMB_VFS_REALPATH(conn,conn->connectpath);
32 if (!resolved_name) {
33 return false;
34 }
35 ret = set_conn_connectpath(conn,resolved_name);
36 SAFE_FREE(resolved_name);
37 return ret;
38 }
39
40 /****************************************************************************
41 Ensure when setting connectpath it is a canonicalized (no ./ // or ../)
42 absolute path stating in / and not ending in /.
43 Observent people will notice a similarity between this and check_path_syntax :-).
44 ****************************************************************************/
45
46 bool set_conn_connectpath(connection_struct *conn, const char *connectpath)
47 {
48 char *destname;
49 char *d;
50 const char *s = connectpath;
51 bool start_of_name_component = true;
52
53 if (connectpath == NULL || connectpath[0] == '\0') {
54 return false;
55 }
56
57 /* Allocate for strlen + '\0' + possible leading '/' */
58 destname = (char *)SMB_MALLOC(strlen(connectpath) + 2);
59 if (!destname) {
60 return false;
61 }
62 d = destname;
63
64 *d++ = '/'; /* Always start with root. */
65
66 while (*s) {
67 if (*s == '/') {
68 /* Eat multiple '/' */
69 while (*s == '/') {
70 s++;
71 }
72 if ((d > destname + 1) && (*s != '\0')) {
73 *d++ = '/';
74 }
75 start_of_name_component = True;
76 continue;
77 }
78
79 if (start_of_name_component) {
80 if ((s[0] == '.') && (s[1] == '.') && (s[2] == '/' || s[2] == '\0')) {
81 /* Uh oh - "/../" or "/..\0" ! */
82
83 /* Go past the ../ or .. */
84 if (s[2] == '/') {
85 s += 3;
86 } else {
87 s += 2; /* Go past the .. */
88 }
89
90 /* If we just added a '/' - delete it */
91 if ((d > destname) && (*(d-1) == '/')) {
92 *(d-1) = '\0';
93 d--;
94 }
95
96 /* Are we at the start ? Can't go back further if so. */
97 if (d <= destname) {
98 *d++ = '/'; /* Can't delete root */
99 continue;
100 }
101 /* Go back one level... */
102 /* Decrement d first as d points to the *next* char to write into. */
103 for (d--; d > destname; d--) {
104 if (*d == '/') {
105 break;
106 }
107 }
108 /* We're still at the start of a name component, just the previous one. */
109 continue;
110 } else if ((s[0] == '.') && ((s[1] == '\0') || s[1] == '/')) {
111 /* Component of pathname can't be "." only - skip the '.' . */
112 if (s[1] == '/') {
113 s += 2;
114 } else {
115 s++;
116 }
117 continue;
118 }
119 }
120
121 if (!(*s & 0x80)) {
122 *d++ = *s++;
123 } else {
124 size_t siz;
125 /* Get the size of the next MB character. */
126 next_codepoint(s,&siz);
127 switch(siz) {
128 case 5:
129 *d++ = *s++;
130 /*fall through*/
131 case 4:
132 *d++ = *s++;
133 /*fall through*/
134 case 3:
135 *d++ = *s++;
136 /*fall through*/
137 case 2:
138 *d++ = *s++;
139 /*fall through*/
140 case 1:
141 *d++ = *s++;
142 break;
143 default:
144 break;
145 }
146 }
147 start_of_name_component = false;
148 }
149 *d = '\0';
150
151 /* And must not end in '/' */
152 if (d > destname + 1 && (*(d-1) == '/')) {
153 *(d-1) = '\0';
154 }
155
156 DEBUG(10,("set_conn_connectpath: service %s, connectpath = %s\n",
157 lp_servicename(SNUM(conn)), destname ));
158
159 string_set(&conn->connectpath, destname);
160 SAFE_FREE(destname);
161 return true;
162 }
163
164 /****************************************************************************
165 Load parameters specific to a connection/service.
166 ****************************************************************************/
167
168 bool set_current_service(connection_struct *conn, uint16 flags, bool do_chdir)
169 {
170 int snum;
171
172 if (!conn) {
173 last_conn = NULL;
174 return(False);
175 }
176
177 conn->lastused_count++;
178
179 snum = SNUM(conn);
180
181 if (do_chdir &&
182 vfs_ChDir(conn,conn->connectpath) != 0 &&
183 vfs_ChDir(conn,conn->origpath) != 0) {
184 DEBUG(((errno!=EACCES)?0:3),("chdir (%s) failed, reason: %s\n",
185 conn->connectpath, strerror(errno)));
186 return(False);
187 }
188
189 if ((conn == last_conn) && (last_flags == flags)) {
190 return(True);
191 }
192
193 last_conn = conn;
194 last_flags = flags;
195
196 /* Obey the client case sensitivity requests - only for clients that support it. */
197 switch (lp_casesensitive(snum)) {
198 case Auto:
199 {
200 /* We need this uglyness due to DOS/Win9x clients that lie about case insensitivity. */
201 enum remote_arch_types ra_type = get_remote_arch();
202 if ((ra_type != RA_SAMBA) && (ra_type != RA_CIFSFS)) {
203 /* Client can't support per-packet case sensitive pathnames. */
204 conn->case_sensitive = False;
205 } else {
206 conn->case_sensitive = !(flags & FLAG_CASELESS_PATHNAMES);
207 }
208 }
209 break;
210 case True:
211 conn->case_sensitive = True;
212 break;
213 default:
214 conn->case_sensitive = False;
215 break;
216 }
217 return(True);
218 }
219
220 static int load_registry_service(const char *servicename)
221 {
222 if (!lp_registry_shares()) {
223 return -1;
224 }
225
226 if ((servicename == NULL) || (*servicename == '\0')) {
227 return -1;
228 }
229
230 if (strequal(servicename, GLOBAL_NAME)) {
231 return -2;
232 }
233
234 if (!process_registry_service(servicename)) {
235 return -1;
236 }
237
238 return lp_servicenumber(servicename);
239 }
240
241 void load_registry_shares(void)
242 {
243 DEBUG(8, ("load_registry_shares()\n"));
244 if (!lp_registry_shares()) {
245 return;
246 }
247
248 process_registry_shares();
249
250 return;
251 }
252
253 /****************************************************************************
254 Add a home service. Returns the new service number or -1 if fail.
255 ****************************************************************************/
256
257 int add_home_service(const char *service, const char *username, const char *homedir)
258 {
259 int iHomeService;
260
261 if (!service || !homedir || homedir[0] == '\0')
262 return -1;
263
264 if ((iHomeService = lp_servicenumber(HOMES_NAME)) < 0) {
265 if ((iHomeService = load_registry_service(HOMES_NAME)) < 0) {
266 return -1;
267 }
268 }
269
270 /*
271 * If this is a winbindd provided username, remove
272 * the domain component before adding the service.
273 * Log a warning if the "path=" parameter does not
274 * include any macros.
275 */
276
277 {
278 const char *p = strchr(service,*lp_winbind_separator());
279
280 /* We only want the 'user' part of the string */
281 if (p) {
282 service = p + 1;
283 }
284 }
285
286 if (!lp_add_home(service, iHomeService, username, homedir)) {
287 return -1;
288 }
289
290 return lp_servicenumber(service);
291
292 }
293
294 /**
295 * Find a service entry.
296 *
297 * @param service is modified (to canonical form??)
298 **/
299
300 int find_service(TALLOC_CTX *ctx, const char *service_in, char **p_service_out)
301 {
302 int iService;
303
304 if (!service_in) {
305 return -1;
306 }
307
308 /* First make a copy. */
309 *p_service_out = talloc_strdup(ctx, service_in);
310 if (!*p_service_out) {
311 return -1;
312 }
313
314 all_string_sub(*p_service_out,"\\","/",0);
315
316 iService = lp_servicenumber(*p_service_out);
317
318 /* now handle the special case of a home directory */
319 if (iService < 0) {
320 char *phome_dir = get_user_home_dir(ctx, *p_service_out);
321
322 if(!phome_dir) {
323 /*
324 * Try mapping the servicename, it may
325 * be a Windows to unix mapped user name.
326 */
327 if(map_username(ctx, *p_service_out, p_service_out)) {
328 if (*p_service_out == NULL) {
329 /* Out of memory. */
330 return -1;
331 }
332 phome_dir = get_user_home_dir(
333 ctx, *p_service_out);
334 }
335 }
336
337 DEBUG(3,("checking for home directory %s gave %s\n",*p_service_out,
338 phome_dir?phome_dir:"(NULL)"));
339
340 iService = add_home_service(*p_service_out,*p_service_out /* 'username' */, phome_dir);
341 }
342
343 /* If we still don't have a service, attempt to add it as a printer. */
344 if (iService < 0) {
345 int iPrinterService;
346
347 if ((iPrinterService = lp_servicenumber(PRINTERS_NAME)) < 0) {
348 iPrinterService = load_registry_service(PRINTERS_NAME);
349 }
350 if (iPrinterService >= 0) {
351 DEBUG(3,("checking whether %s is a valid printer name...\n",
352 *p_service_out));
353 if (pcap_printername_ok(*p_service_out)) {
354 DEBUG(3,("%s is a valid printer name\n",
355 *p_service_out));
356 DEBUG(3,("adding %s as a printer service\n",
357 *p_service_out));
358 lp_add_printer(*p_service_out, iPrinterService);
359 iService = lp_servicenumber(*p_service_out);
360 if (iService < 0) {
361 DEBUG(0,("failed to add %s as a printer service!\n",
362 *p_service_out));
363 }
364 } else {
365 DEBUG(3,("%s is not a valid printer name\n",
366 *p_service_out));
367 }
368 }
369 }
370
371 /* Check for default vfs service? Unsure whether to implement this */
372 if (iService < 0) {
373 }
374
375 if (iService < 0) {
376 iService = load_registry_service(*p_service_out);
377 }
378
379 /* Is it a usershare service ? */
380 if (iService < 0 && *lp_usershare_path()) {
381 /* Ensure the name is canonicalized. */
382 strlower_m(*p_service_out);
383 iService = load_usershare_service(*p_service_out);
384 }
385
386 /* just possibly it's a default service? */
387 if (iService < 0) {
388 char *pdefservice = lp_defaultservice();
389 if (pdefservice &&
390 *pdefservice &&
391 !strequal(pdefservice, *p_service_out)
392 && !strstr_m(*p_service_out,"..")) {
393 /*
394 * We need to do a local copy here as lp_defaultservice()
395 * returns one of the rotating lp_string buffers that
396 * could get overwritten by the recursive find_service() call
397 * below. Fix from Josef Hinteregger <joehtg@joehtg.co.at>.
398 */
399 char *defservice = talloc_strdup(ctx, pdefservice);
400
401 if (!defservice) {
402 goto fail;
403 }
404
405 /* Disallow anything except explicit share names. */
406 if (strequal(defservice,HOMES_NAME) ||
407 strequal(defservice, PRINTERS_NAME) ||
408 strequal(defservice, "IPC$")) {
409 TALLOC_FREE(defservice);
410 goto fail;
411 }
412
413 iService = find_service(ctx, defservice, p_service_out);
414 if (!*p_service_out) {
415 TALLOC_FREE(defservice);
416 iService = -1;
417 goto fail;
418 }
419 if (iService >= 0) {
420 all_string_sub(*p_service_out, "_","/",0);
421 iService = lp_add_service(*p_service_out, iService);
422 }
423 TALLOC_FREE(defservice);
424 }
425 }
426
427 if (iService >= 0) {
428 if (!VALID_SNUM(iService)) {
429 DEBUG(0,("Invalid snum %d for %s\n",iService,
430 *p_service_out));
431 iService = -1;
432 }
433 }
434
435 fail:
436
437 if (iService < 0) {
438 DEBUG(3,("find_service() failed to find service %s\n",
439 *p_service_out));
440 }
441
442 return (iService);
443 }
444
445
446 /****************************************************************************
447 do some basic sainity checks on the share.
448 This function modifies dev, ecode.
449 ****************************************************************************/
450
451 static NTSTATUS share_sanity_checks(struct client_address *client_id, int snum,
452 fstring dev)
453 {
454 if (!lp_snum_ok(snum) ||
455 !allow_access(lp_hostsdeny(snum), lp_hostsallow(snum),
456 client_id->name, client_id->addr)) {
457 return NT_STATUS_ACCESS_DENIED;
458 }
459
460 if (dev[0] == '?' || !dev[0]) {
461 if (lp_print_ok(snum)) {
462 fstrcpy(dev,"LPT1:");
463 } else if (strequal(lp_fstype(snum), "IPC")) {
464 fstrcpy(dev, "IPC");
465 } else {
466 fstrcpy(dev,"A:");
467 }
468 }
469
470 strupper_m(dev);
471
472 if (lp_print_ok(snum)) {
473 if (!strequal(dev, "LPT1:")) {
474 return NT_STATUS_BAD_DEVICE_TYPE;
475 }
476 } else if (strequal(lp_fstype(snum), "IPC")) {
477 if (!strequal(dev, "IPC")) {
478 return NT_STATUS_BAD_DEVICE_TYPE;
479 }
480 } else if (!strequal(dev, "A:")) {
481 return NT_STATUS_BAD_DEVICE_TYPE;
482 }
483
484 /* Behave as a printer if we are supposed to */
485 if (lp_print_ok(snum) && (strcmp(dev, "A:") == 0)) {
486 fstrcpy(dev, "LPT1:");
487 }
488
489 return NT_STATUS_OK;
490 }
491
492 /*
493 * Go through lookup_name etc to find the force'd group.
494 *
495 * Create a new token from src_token, replacing the primary group sid with the
496 * one found.
497 */
498
499 static NTSTATUS find_forced_group(bool force_user,
500 int snum, const char *username,
501 struct dom_sid *pgroup_sid,
502 gid_t *pgid)
503 {
504 NTSTATUS result = NT_STATUS_NO_SUCH_GROUP;
505 TALLOC_CTX *frame = talloc_stackframe();
506 struct dom_sid group_sid;
507 enum lsa_SidType type;
508 char *groupname;
509 bool user_must_be_member = False;
510 gid_t gid;
511
512 groupname = talloc_strdup(talloc_tos(), lp_force_group(snum));
513 if (groupname == NULL) {
514 DEBUG(1, ("talloc_strdup failed\n"));
515 result = NT_STATUS_NO_MEMORY;
516 goto done;
517 }
518
519 if (groupname[0] == '+') {
520 user_must_be_member = True;
521 groupname += 1;
522 }
523
524 groupname = talloc_string_sub(talloc_tos(), groupname,
525 "%S", lp_servicename(snum));
526 if (groupname == NULL) {
527 DEBUG(1, ("talloc_string_sub failed\n"));
528 result = NT_STATUS_NO_MEMORY;
529 goto done;
530 }
531
532 if (!lookup_name_smbconf(talloc_tos(), groupname,
533 LOOKUP_NAME_ALL|LOOKUP_NAME_GROUP,
534 NULL, NULL, &group_sid, &type)) {
535 DEBUG(10, ("lookup_name_smbconf(%s) failed\n",
536 groupname));
537 goto done;
538 }
539
540 if ((type != SID_NAME_DOM_GRP) && (type != SID_NAME_ALIAS) &&
541 (type != SID_NAME_WKN_GRP)) {
542 DEBUG(10, ("%s is a %s, not a group\n", groupname,
543 sid_type_lookup(type)));
544 goto done;
545 }
546
547 if (!sid_to_gid(&group_sid, &gid)) {
548 DEBUG(10, ("sid_to_gid(%s) for %s failed\n",
549 sid_string_dbg(&group_sid), groupname));
550 goto done;
551 }
552
553 /*
554 * If the user has been forced and the forced group starts with a '+',
555 * then we only set the group to be the forced group if the forced
556 * user is a member of that group. Otherwise, the meaning of the '+'
557 * would be ignored.
558 */
559
560 if (force_user && user_must_be_member) {
561 if (user_in_group_sid(username, &group_sid)) {
562 sid_copy(pgroup_sid, &group_sid);
563 *pgid = gid;
564 DEBUG(3,("Forced group %s for member %s\n",
565 groupname, username));
566 } else {
567 DEBUG(0,("find_forced_group: forced user %s is not a member "
568 "of forced group %s. Disallowing access.\n",
569 username, groupname ));
570 result = NT_STATUS_MEMBER_NOT_IN_GROUP;
571 goto done;
572 }
573 } else {
574 sid_copy(pgroup_sid, &group_sid);
575 *pgid = gid;
576 DEBUG(3,("Forced group %s\n", groupname));
577 }
578
579 result = NT_STATUS_OK;
580 done:
581 TALLOC_FREE(frame);
582 return result;
583 }
584
585 /****************************************************************************
586 Create an auth_serversupplied_info structure for a connection_struct
587 ****************************************************************************/
588
589 static NTSTATUS create_connection_session_info(struct smbd_server_connection *sconn,
590 TALLOC_CTX *mem_ctx, int snum,
591 struct auth_serversupplied_info *vuid_serverinfo,
592 DATA_BLOB password,
593 struct auth_serversupplied_info **presult)
594 {
595 if (lp_guest_only(snum)) {
596 return make_server_info_guest(mem_ctx, presult);
597 }
598
599 if (vuid_serverinfo != NULL) {
600
601 struct auth_serversupplied_info *result;
602
603 /*
604 * This is the normal security != share case where we have a
605 * valid vuid from the session setup. */
606
607 if (vuid_serverinfo->guest) {
608 if (!lp_guest_ok(snum)) {
609 DEBUG(2, ("guest user (from session setup) "
610 "not permitted to access this share "
611 "(%s)\n", lp_servicename(snum)));
612 return NT_STATUS_ACCESS_DENIED;
613 }
614 } else {
615 if (!user_ok_token(vuid_serverinfo->unix_name,
616 vuid_serverinfo->info3->base.domain.string,
617 vuid_serverinfo->security_token, snum)) {
618 DEBUG(2, ("user '%s' (from session setup) not "
619 "permitted to access this share "
620 "(%s)\n",
621 vuid_serverinfo->unix_name,
622 lp_servicename(snum)));
623 return NT_STATUS_ACCESS_DENIED;
624 }
625 }
626
627 result = copy_serverinfo(mem_ctx, vuid_serverinfo);
628 if (result == NULL) {
629 return NT_STATUS_NO_MEMORY;
630 }
631
632 *presult = result;
633 return NT_STATUS_OK;
634 }
635
636 if (lp_security() == SEC_SHARE) {
637
638 fstring user;
639 bool guest;
640
641 /* add the sharename as a possible user name if we
642 are in share mode security */
643
644 add_session_user(sconn, lp_servicename(snum));
645
646 /* shall we let them in? */
647
648 if (!authorise_login(sconn, snum,user,password,&guest)) {
649 DEBUG( 2, ( "Invalid username/password for [%s]\n",
650 lp_servicename(snum)) );
651 return NT_STATUS_WRONG_PASSWORD;
652 }
653
654 return make_serverinfo_from_username(mem_ctx, user, guest,
655 presult);
656 }
657
658 DEBUG(0, ("invalid VUID (vuser) but not in security=share\n"));
659 return NT_STATUS_ACCESS_DENIED;
660 }
661
662 /****************************************************************************
663 set relavent user and group settings corresponding to force user/group
664 configuration for the given snum.
665 ****************************************************************************/
666
667 NTSTATUS set_conn_force_user_group(connection_struct *conn, int snum)
668 {
669 NTSTATUS status;
670
671 if (*lp_force_user(snum)) {
672
673 /*
674 * Replace conn->session_info with a completely faked up one
675 * from the username we are forced into :-)
676 */
677
678 char *fuser;
679 struct auth_serversupplied_info *forced_serverinfo;
680
681 fuser = talloc_string_sub(conn, lp_force_user(snum), "%S",
682 lp_const_servicename(snum));
683 if (fuser == NULL) {
684 return NT_STATUS_NO_MEMORY;
685 }
686
687 status = make_serverinfo_from_username(
688 conn, fuser, conn->session_info->guest,
689 &forced_serverinfo);
690 if (!NT_STATUS_IS_OK(status)) {
691 return status;
692 }
693
694 TALLOC_FREE(conn->session_info);
695 conn->session_info = forced_serverinfo;
696
697 conn->force_user = true;
698 DEBUG(3,("Forced user %s\n", fuser));
699 }
700
701 /*
702 * If force group is true, then override
703 * any groupid stored for the connecting user.
704 */
705
706 if (*lp_force_group(snum)) {
707
708 status = find_forced_group(
709 conn->force_user, snum, conn->session_info->unix_name,
710 &conn->session_info->security_token->sids[1],
711 &conn->session_info->utok.gid);
712
713 if (!NT_STATUS_IS_OK(status)) {
714 return status;
715 }
716
717 /*
718 * We need to cache this gid, to use within
719 * change_to_user() separately from the conn->session_info
720 * struct. We only use conn->session_info directly if
721 * "force_user" was set.
722 */
723 conn->force_group_gid = conn->session_info->utok.gid;
724 }
725
726 return NT_STATUS_OK;
727 }
728
729 /****************************************************************************
730 Make a connection, given the snum to connect to, and the vuser of the
731 connecting user if appropriate.
732 ****************************************************************************/
733
734 connection_struct *make_connection_snum(struct smbd_server_connection *sconn,
735 int snum, user_struct *vuser,
736 DATA_BLOB password,
737 const char *pdev,
738 NTSTATUS *pstatus)
739 {
740 connection_struct *conn = NULL;
741 struct smb_filename *smb_fname_cpath = NULL;
742 fstring dev;
743 int ret;
744 bool on_err_call_dis_hook = false;
745 bool claimed_connection = false;
746 uid_t effuid;
747 gid_t effgid;
748 NTSTATUS status;
749
750 fstrcpy(dev, pdev);
751
752 *pstatus = share_sanity_checks(&sconn->client_id, snum, dev);
753 if (NT_STATUS_IS_ERR(*pstatus)) {
754 goto err_root_exit;
755 }
756
757 conn = conn_new(sconn);
758 if (!conn) {
759 DEBUG(0,("Couldn't find free connection.\n"));
760 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
761 goto err_root_exit;
762 }
763
764 conn->params->service = snum;
765
766 status = create_connection_session_info(sconn,
767 conn, snum, vuser ? vuser->session_info : NULL, password,
768 &conn->session_info);
769
770 if (!NT_STATUS_IS_OK(status)) {
771 DEBUG(1, ("create_connection_session_info failed: %s\n",
772 nt_errstr(status)));
773 *pstatus = status;
774 goto err_root_exit;
775 }
776
777 if ((lp_guest_only(snum)) || (lp_security() == SEC_SHARE)) {
778 conn->force_user = true;
779 }
780
781 add_session_user(sconn, conn->session_info->unix_name);
782
783 conn->num_files_open = 0;
784 conn->lastused = conn->lastused_count = time(NULL);
785 conn->used = True;
786 conn->printer = (strncmp(dev,"LPT",3) == 0);
787 conn->ipc = ( (strncmp(dev,"IPC",3) == 0) ||
788 ( lp_enable_asu_support() && strequal(dev,"ADMIN$")) );
789
790 /* Case options for the share. */
791 if (lp_casesensitive(snum) == Auto) {
792 /* We will be setting this per packet. Set to be case
793 * insensitive for now. */
794 conn->case_sensitive = False;
795 } else {
796 conn->case_sensitive = (bool)lp_casesensitive(snum);
797 }
798
799 conn->case_preserve = lp_preservecase(snum);
800 conn->short_case_preserve = lp_shortpreservecase(snum);
801
802 conn->encrypt_level = lp_smb_encrypt(snum);
803
804 conn->veto_list = NULL;
805 conn->hide_list = NULL;
806 conn->veto_oplock_list = NULL;
807 conn->aio_write_behind_list = NULL;
808
809 conn->read_only = lp_readonly(SNUM(conn));
810
811 status = set_conn_force_user_group(conn, snum);
812 if (!NT_STATUS_IS_OK(status)) {
813 conn_free(conn);
814 *pstatus = status;
815 return NULL;
816 }
817
818 conn->vuid = (vuser != NULL) ? vuser->vuid : UID_FIELD_INVALID;
819
820 {
821 char *s = talloc_sub_advanced(talloc_tos(),
822 lp_servicename(SNUM(conn)),
823 conn->session_info->unix_name,
824 conn->connectpath,
825 conn->session_info->utok.gid,
826 conn->session_info->sanitized_username,
827 conn->session_info->info3->base.domain.string,
828 lp_pathname(snum));
829 if (!s) {
830 *pstatus = NT_STATUS_NO_MEMORY;
831 goto err_root_exit;
832 }
833
834 if (!set_conn_connectpath(conn,s)) {
835 TALLOC_FREE(s);
836 *pstatus = NT_STATUS_NO_MEMORY;
837 goto err_root_exit;
838 }
839 DEBUG(3,("Connect path is '%s' for service [%s]\n",s,
840 lp_servicename(snum)));
841 TALLOC_FREE(s);
842 }
843
844 /*
845 * New code to check if there's a share security descripter
846 * added from NT server manager. This is done after the
847 * smb.conf checks are done as we need a uid and token. JRA.
848 *
849 */
850
851 {
852 bool can_write = False;
853
854 can_write = share_access_check(conn->session_info->security_token,
855 lp_servicename(snum),
856 FILE_WRITE_DATA);
857
858 if (!can_write) {
859 if (!share_access_check(conn->session_info->security_token,
860 lp_servicename(snum),
861 FILE_READ_DATA)) {
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 }
874 /* Initialise VFS function pointers */
875
876 if (!smbd_vfs_init(conn)) {
877 DEBUG(0, ("vfs_init failed for service %s\n",
878 lp_servicename(snum)));
879 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
880 goto err_root_exit;
881 }
882
883 /* ROOT Activities: */
884 /* explicitly check widelinks here so that we can correctly warn
885 * in the logs. */
886 widelinks_warning(snum);
887
888 /*
889 * Enforce the max connections parameter.
890 */
891
892 if ((lp_max_connections(snum) > 0)
893 && (count_current_connections(lp_servicename(SNUM(conn)), True) >=
894 lp_max_connections(snum))) {
895
896 DEBUG(1, ("Max connections (%d) exceeded for %s\n",
897 lp_max_connections(snum), lp_servicename(snum)));
898 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
899 goto err_root_exit;
900 }
901
902 /*
903 * Get us an entry in the connections db
904 */
905 if (!claim_connection(conn, lp_servicename(snum))) {
906 DEBUG(1, ("Could not store connections entry\n"));
907 *pstatus = NT_STATUS_INTERNAL_DB_ERROR;
908 goto err_root_exit;
909 }
910 claimed_connection = true;
911
912 /* Invoke VFS make connection hook - this must be the first
913 filesystem operation that we do. */
914
915 if (SMB_VFS_CONNECT(conn, lp_servicename(snum),
916 conn->session_info->unix_name) < 0) {
917 DEBUG(0,("make_connection: VFS make connection failed!\n"));
918 *pstatus = NT_STATUS_UNSUCCESSFUL;
919 goto err_root_exit;
920 }
921
922 /* Any error exit after here needs to call the disconnect hook. */
923 on_err_call_dis_hook = true;
924
925 if ((!conn->printer) && (!conn->ipc)) {
926 conn->notify_ctx = notify_init(conn,
927 sconn_server_id(sconn),
928 sconn->msg_ctx,
929 smbd_event_context(),
930 conn);
931 }
932
933 /*
934 * Fix compatibility issue pointed out by Volker.
935 * We pass the conn->connectpath to the preexec
936 * scripts as a parameter, so attempt to canonicalize
937 * it here before calling the preexec scripts.
938 * We ignore errors here, as it is possible that
939 * the conn->connectpath doesn't exist yet and
940 * the preexec scripts will create them.
941 */
942
943 (void)canonicalize_connect_path(conn);
944
945 /* Preexecs are done here as they might make the dir we are to ChDir
946 * to below */
947 /* execute any "root preexec = " line */
948 if (*lp_rootpreexec(snum)) {
949 char *cmd = talloc_sub_advanced(talloc_tos(),
950 lp_servicename(SNUM(conn)),
951 conn->session_info->unix_name,
952 conn->connectpath,
953 conn->session_info->utok.gid,
954 conn->session_info->sanitized_username,
955 conn->session_info->info3->base.domain.string,
956 lp_rootpreexec(snum));
957 DEBUG(5,("cmd=%s\n",cmd));
958 ret = smbrun(cmd,NULL);
959 TALLOC_FREE(cmd);
960 if (ret != 0 && lp_rootpreexec_close(snum)) {
961 DEBUG(1,("root preexec gave %d - failing "
962 "connection\n", ret));
963 *pstatus = NT_STATUS_ACCESS_DENIED;
964 goto err_root_exit;
965 }
966 }
967
968 /* USER Activites: */
969 if (!change_to_user(conn, conn->vuid)) {
970 /* No point continuing if they fail the basic checks */
971 DEBUG(0,("Can't become connected user!\n"));
972 *pstatus = NT_STATUS_LOGON_FAILURE;
973 goto err_root_exit;
974 }
975
976 effuid = geteuid();
977 effgid = getegid();
978
979 /* Remember that a different vuid can connect later without these
980 * checks... */
981
982 /* Preexecs are done here as they might make the dir we are to ChDir
983 * to below */
984
985 /* execute any "preexec = " line */
986 if (*lp_preexec(snum)) {
987 char *cmd = talloc_sub_advanced(talloc_tos(),
988 lp_servicename(SNUM(conn)),
989 conn->session_info->unix_name,
990 conn->connectpath,
991 conn->session_info->utok.gid,
992 conn->session_info->sanitized_username,
993 conn->session_info->info3->base.domain.string,
994 lp_preexec(snum));
995 ret = smbrun(cmd,NULL);
996 TALLOC_FREE(cmd);
997 if (ret != 0 && lp_preexec_close(snum)) {
998 DEBUG(1,("preexec gave %d - failing connection\n",
999 ret));
1000 *pstatus = NT_STATUS_ACCESS_DENIED;
1001 goto err_root_exit;
1002 }
1003 }
1004
1005 #ifdef WITH_FAKE_KASERVER
1006 if (lp_afs_share(snum)) {
1007 afs_login(conn);
1008 }
1009 #endif
1010
1011 /*
1012 * we've finished with the user stuff - go back to root
1013 * so the SMB_VFS_STAT call will only fail on path errors,
1014 * not permission problems.
1015 */
1016 change_to_root_user();
1017 /* ROOT Activites: */
1018
1019 /*
1020 * If widelinks are disallowed we need to canonicalise the connect
1021 * path here to ensure we don't have any symlinks in the
1022 * connectpath. We will be checking all paths on this connection are
1023 * below this directory. We must do this after the VFS init as we
1024 * depend on the realpath() pointer in the vfs table. JRA.
1025 */
1026 if (!lp_widelinks(snum)) {
1027 if (!canonicalize_connect_path(conn)) {
1028 DEBUG(0, ("canonicalize_connect_path failed "
1029 "for service %s, path %s\n",
1030 lp_servicename(snum),
1031 conn->connectpath));
1032 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
1033 goto err_root_exit;
1034 }
1035 }
1036
1037 /* Add veto/hide lists */
1038 if (!IS_IPC(conn) && !IS_PRINT(conn)) {
1039 set_namearray( &conn->veto_list, lp_veto_files(snum));
1040 set_namearray( &conn->hide_list, lp_hide_files(snum));
1041 set_namearray( &conn->veto_oplock_list, lp_veto_oplocks(snum));
1042 set_namearray( &conn->aio_write_behind_list,
1043 lp_aio_write_behind(snum));
1044 }
1045 status = create_synthetic_smb_fname(talloc_tos(), conn->connectpath,
1046 NULL, NULL, &smb_fname_cpath);
1047 if (!NT_STATUS_IS_OK(status)) {
1048 *pstatus = status;
1049 goto err_root_exit;
1050 }
1051
1052 /* win2000 does not check the permissions on the directory
1053 during the tree connect, instead relying on permission
1054 check during individual operations. To match this behaviour
1055 I have disabled this chdir check (tridge) */
1056 /* the alternative is just to check the directory exists */
1057
1058 if ((ret = SMB_VFS_STAT(conn, smb_fname_cpath)) != 0 ||
1059 !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
1060 if (ret == 0 && !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
1061 DEBUG(0,("'%s' is not a directory, when connecting to "
1062 "[%s]\n", conn->connectpath,
1063 lp_servicename(snum)));
1064 } else {
1065 DEBUG(0,("'%s' does not exist or permission denied "
1066 "when connecting to [%s] Error was %s\n",
1067 conn->connectpath, lp_servicename(snum),
1068 strerror(errno) ));
1069 }
1070 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
1071 goto err_root_exit;
1072 }
1073 conn->base_share_dev = smb_fname_cpath->st.st_ex_dev;
1074
1075 string_set(&conn->origpath,conn->connectpath);
1076
1077 /* Figure out the characteristics of the underlying filesystem. This
1078 * assumes that all the filesystem mounted withing a share path have
1079 * the same characteristics, which is likely but not guaranteed.
1080 */
1081
1082 conn->fs_capabilities = SMB_VFS_FS_CAPABILITIES(conn, &conn->ts_res);
1083
1084 /*
1085 * Print out the 'connected as' stuff here as we need
1086 * to know the effective uid and gid we will be using
1087 * (at least initially).
1088 */
1089
1090 if( DEBUGLVL( IS_IPC(conn) ? 3 : 1 ) ) {
1091 dbgtext( "%s (%s) ", get_remote_machine_name(),
1092 conn->sconn->client_id.addr );
1093 dbgtext( "%s", srv_is_signing_active(sconn) ? "signed " : "");
1094 dbgtext( "connect to service %s ", lp_servicename(snum) );
1095 dbgtext( "initially as user %s ",
1096 conn->session_info->unix_name );
1097 dbgtext( "(uid=%d, gid=%d) ", (int)effuid, (int)effgid );
1098 dbgtext( "(pid %d)\n", (int)sys_getpid() );
1099 }
1100
1101 return(conn);
1102
1103 err_root_exit:
1104 TALLOC_FREE(smb_fname_cpath);
1105 /* We must exit this function as root. */
1106 if (geteuid() != 0) {
1107 change_to_root_user();
1108 }
1109 if (on_err_call_dis_hook) {
1110 /* Call VFS disconnect hook */
1111 SMB_VFS_DISCONNECT(conn);
1112 }
1113 if (claimed_connection) {
1114 yield_connection(conn, lp_servicename(snum));
1115 }
1116 if (conn) {
1117 conn_free(conn);
1118 }
1119 return NULL;
1120 }
1121
1122 /****************************************************************************
1123 Make a connection to a service.
1124 *
1125 * @param service
1126 ****************************************************************************/
1127
1128 connection_struct *make_connection(struct smbd_server_connection *sconn,
1129 const char *service_in, DATA_BLOB password,
1130 const char *pdev, uint16 vuid,
1131 NTSTATUS *status)
1132 {
1133 uid_t euid;
1134 user_struct *vuser = NULL;
1135 char *service = NULL;
1136 fstring dev;
1137 int snum = -1;
1138
1139 fstrcpy(dev, pdev);
1140
1141 /* This must ONLY BE CALLED AS ROOT. As it exits this function as
1142 * root. */
1143 if (!non_root_mode() && (euid = geteuid()) != 0) {
1144 DEBUG(0,("make_connection: PANIC ERROR. Called as nonroot "
1145 "(%u)\n", (unsigned int)euid ));
1146 smb_panic("make_connection: PANIC ERROR. Called as nonroot\n");
1147 }
1148
1149 if (conn_num_open(sconn) > 2047) {
1150 *status = NT_STATUS_INSUFF_SERVER_RESOURCES;
1151 return NULL;
1152 }
1153
1154 if(lp_security() != SEC_SHARE) {
1155 vuser = get_valid_user_struct(sconn, vuid);
1156 if (!vuser) {
1157 DEBUG(1,("make_connection: refusing to connect with "
1158 "no session setup\n"));
1159 *status = NT_STATUS_ACCESS_DENIED;
1160 return NULL;
1161 }
1162 }
1163
1164 /* Logic to try and connect to the correct [homes] share, preferably
1165 without too many getpwnam() lookups. This is particulary nasty for
1166 winbind usernames, where the share name isn't the same as unix
1167 username.
1168
1169 The snum of the homes share is stored on the vuser at session setup
1170 time.
1171 */
1172
1173 if (strequal(service_in,HOMES_NAME)) {
1174 if(lp_security() != SEC_SHARE) {
1175 DATA_BLOB no_pw = data_blob_null;
1176 if (vuser->homes_snum == -1) {
1177 DEBUG(2, ("[homes] share not available for "
1178 "this user because it was not found "
1179 "or created at session setup "
1180 "time\n"));
1181 *status = NT_STATUS_BAD_NETWORK_NAME;
1182 return NULL;
1183 }
1184 DEBUG(5, ("making a connection to [homes] service "
1185 "created at session setup time\n"));
1186 return make_connection_snum(sconn,
1187 vuser->homes_snum,
1188 vuser, no_pw,
1189 dev, status);
1190 } else {
1191 /* Security = share. Try with
1192 * current_user_info.smb_name as the username. */
1193 if (*current_user_info.smb_name) {
1194 char *unix_username = NULL;
1195 (void)map_username(talloc_tos(),
1196 current_user_info.smb_name,
1197 &unix_username);
1198 snum = find_service(talloc_tos(),
1199 unix_username,
1200 &unix_username);
1201 if (!unix_username) {
1202 *status = NT_STATUS_NO_MEMORY;
1203 }
1204 return NULL;
1205 }
1206 if (snum != -1) {
1207 DEBUG(5, ("making a connection to 'homes' "
1208 "service %s based on "
1209 "security=share\n", service_in));
1210 return make_connection_snum(sconn,
1211 snum, NULL,
1212 password,
1213 dev, status);
1214 }
1215 }
1216 } else if ((lp_security() != SEC_SHARE) && (vuser->homes_snum != -1)
1217 && strequal(service_in,
1218 lp_servicename(vuser->homes_snum))) {
1219 DATA_BLOB no_pw = data_blob_null;
1220 DEBUG(5, ("making a connection to 'homes' service [%s] "
1221 "created at session setup time\n", service_in));
1222 return make_connection_snum(sconn,
1223 vuser->homes_snum,
1224 vuser, no_pw,
1225 dev, status);
1226 }
1227
1228 service = talloc_strdup(talloc_tos(), service_in);
1229 if (!service) {
1230 *status = NT_STATUS_NO_MEMORY;
1231 return NULL;
1232 }
1233
1234 strlower_m(service);
1235
1236 snum = find_service(talloc_tos(), service, &service);
1237 if (!service) {
1238 *status = NT_STATUS_NO_MEMORY;
1239 return NULL;
1240 }
1241
1242 if (snum < 0) {
1243 if (strequal(service,"IPC$") ||
1244 (lp_enable_asu_support() && strequal(service,"ADMIN$"))) {
1245 DEBUG(3,("refusing IPC connection to %s\n", service));
1246 *status = NT_STATUS_ACCESS_DENIED;
1247 return NULL;
1248 }
1249
1250 DEBUG(3,("%s (%s) couldn't find service %s\n",
1251 get_remote_machine_name(),
1252 tsocket_address_string(
1253 sconn->remote_address, talloc_tos()),
1254 service));
1255 *status = NT_STATUS_BAD_NETWORK_NAME;
1256 return NULL;
1257 }
1258
1259 /* Handle non-Dfs clients attempting connections to msdfs proxy */
1260 if (lp_host_msdfs() && (*lp_msdfs_proxy(snum) != '\0')) {
1261 DEBUG(3, ("refusing connection to dfs proxy share '%s' "
1262 "(pointing to %s)\n",
1263 service, lp_msdfs_proxy(snum)));
1264 *status = NT_STATUS_BAD_NETWORK_NAME;
1265 return NULL;
1266 }
1267
1268 DEBUG(5, ("making a connection to 'normal' service %s\n", service));
1269
1270 return make_connection_snum(sconn, snum, vuser,
1271 password,
1272 dev, status);
1273 }
1274
1275 /****************************************************************************
1276 Close a cnum.
1277 ****************************************************************************/
1278
1279 void close_cnum(connection_struct *conn, uint16 vuid)
1280 {
1281 file_close_conn(conn);
1282
1283 if (!IS_IPC(conn)) {
1284 dptr_closecnum(conn);
1285 }
1286
1287 change_to_root_user();
1288
1289 DEBUG(IS_IPC(conn)?3:1, ("%s (%s) closed connection to service %s\n",
1290 get_remote_machine_name(),
1291 conn->sconn->client_id.addr,
1292 lp_servicename(SNUM(conn))));
1293
1294 /* Call VFS disconnect hook */
1295 SMB_VFS_DISCONNECT(conn);
1296
1297 yield_connection(conn, lp_servicename(SNUM(conn)));
1298
1299 /* make sure we leave the directory available for unmount */
1300 vfs_ChDir(conn, "/");
1301
1302 /* execute any "postexec = " line */
1303 if (*lp_postexec(SNUM(conn)) &&
1304 change_to_user(conn, vuid)) {
1305 char *cmd = talloc_sub_advanced(talloc_tos(),
1306 lp_servicename(SNUM(conn)),
1307 conn->session_info->unix_name,
1308 conn->connectpath,
1309 conn->session_info->utok.gid,
1310 conn->session_info->sanitized_username,
1311 conn->session_info->info3->base.domain.string,
1312 lp_postexec(SNUM(conn)));
1313 smbrun(cmd,NULL);
1314 TALLOC_FREE(cmd);
1315 change_to_root_user();
1316 }
1317
1318 change_to_root_user();
1319 /* execute any "root postexec = " line */
1320 if (*lp_rootpostexec(SNUM(conn))) {
1321 char *cmd = talloc_sub_advanced(talloc_tos(),
1322 lp_servicename(SNUM(conn)),
1323 conn->session_info->unix_name,
1324 conn->connectpath,
1325 conn->session_info->utok.gid,
1326 conn->session_info->sanitized_username,
1327 conn->session_info->info3->base.domain.string,
1328 lp_rootpostexec(SNUM(conn)));
1329 smbrun(cmd,NULL);
1330 TALLOC_FREE(cmd);
1331 }
1332
1333 conn_free(conn);
1334 }
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