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s3: Remove smbd_server_conn from make_connection_snum
[Samba.git] / source3 / smbd / service.c
blob472de24d8f3e7a5fe561707e7a9a336768cf5e37
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
23 extern userdom_struct current_user_info;
24
25 static bool canonicalize_connect_path(connection_struct *conn)
26 {
27 #ifdef REALPATH_TAKES_NULL
28 bool ret;
29 char *resolved_name = SMB_VFS_REALPATH(conn,conn->connectpath,NULL);
30 if (!resolved_name) {
31 return false;
32 }
33 ret = set_conn_connectpath(conn,resolved_name);
34 SAFE_FREE(resolved_name);
35 return ret;
36 #else
37 char resolved_name_buf[PATH_MAX+1];
38 char *resolved_name = SMB_VFS_REALPATH(conn,conn->connectpath,resolved_name_buf);
39 if (!resolved_name) {
40 return false;
41 }
42 return set_conn_connectpath(conn,resolved_name);
43 #endif /* REALPATH_TAKES_NULL */
44 }
45
46 /****************************************************************************
47 Ensure when setting connectpath it is a canonicalized (no ./ // or ../)
48 absolute path stating in / and not ending in /.
49 Observent people will notice a similarity between this and check_path_syntax :-).
50 ****************************************************************************/
51
52 bool set_conn_connectpath(connection_struct *conn, const char *connectpath)
53 {
54 char *destname;
55 char *d;
56 const char *s = connectpath;
57 bool start_of_name_component = true;
58
59 if (connectpath == NULL || connectpath[0] == '\0') {
60 return false;
61 }
62
63 /* Allocate for strlen + '\0' + possible leading '/' */
64 destname = (char *)SMB_MALLOC(strlen(connectpath) + 2);
65 if (!destname) {
66 return false;
67 }
68 d = destname;
69
70 *d++ = '/'; /* Always start with root. */
71
72 while (*s) {
73 if (*s == '/') {
74 /* Eat multiple '/' */
75 while (*s == '/') {
76 s++;
77 }
78 if ((d > destname + 1) && (*s != '\0')) {
79 *d++ = '/';
80 }
81 start_of_name_component = True;
82 continue;
83 }
84
85 if (start_of_name_component) {
86 if ((s[0] == '.') && (s[1] == '.') && (s[2] == '/' || s[2] == '\0')) {
87 /* Uh oh - "/../" or "/..\0" ! */
88
89 /* Go past the ../ or .. */
90 if (s[2] == '/') {
91 s += 3;
92 } else {
93 s += 2; /* Go past the .. */
94 }
95
96 /* If we just added a '/' - delete it */
97 if ((d > destname) && (*(d-1) == '/')) {
98 *(d-1) = '\0';
99 d--;
100 }
101
102 /* Are we at the start ? Can't go back further if so. */
103 if (d <= destname) {
104 *d++ = '/'; /* Can't delete root */
105 continue;
106 }
107 /* Go back one level... */
108 /* Decrement d first as d points to the *next* char to write into. */
109 for (d--; d > destname; d--) {
110 if (*d == '/') {
111 break;
112 }
113 }
114 /* We're still at the start of a name component, just the previous one. */
115 continue;
116 } else if ((s[0] == '.') && ((s[1] == '\0') || s[1] == '/')) {
117 /* Component of pathname can't be "." only - skip the '.' . */
118 if (s[1] == '/') {
119 s += 2;
120 } else {
121 s++;
122 }
123 continue;
124 }
125 }
126
127 if (!(*s & 0x80)) {
128 *d++ = *s++;
129 } else {
130 size_t siz;
131 /* Get the size of the next MB character. */
132 next_codepoint(s,&siz);
133 switch(siz) {
134 case 5:
135 *d++ = *s++;
136 /*fall through*/
137 case 4:
138 *d++ = *s++;
139 /*fall through*/
140 case 3:
141 *d++ = *s++;
142 /*fall through*/
143 case 2:
144 *d++ = *s++;
145 /*fall through*/
146 case 1:
147 *d++ = *s++;
148 break;
149 default:
150 break;
151 }
152 }
153 start_of_name_component = false;
154 }
155 *d = '\0';
156
157 /* And must not end in '/' */
158 if (d > destname + 1 && (*(d-1) == '/')) {
159 *(d-1) = '\0';
160 }
161
162 DEBUG(10,("set_conn_connectpath: service %s, connectpath = %s\n",
163 lp_servicename(SNUM(conn)), destname ));
164
165 string_set(&conn->connectpath, destname);
166 SAFE_FREE(destname);
167 return true;
168 }
169
170 /****************************************************************************
171 Load parameters specific to a connection/service.
172 ****************************************************************************/
173
174 bool set_current_service(connection_struct *conn, uint16 flags, bool do_chdir)
175 {
176 int snum;
177
178 if (!conn) {
179 last_conn = NULL;
180 return(False);
181 }
182
183 conn->lastused_count++;
184
185 snum = SNUM(conn);
186
187 if (do_chdir &&
188 vfs_ChDir(conn,conn->connectpath) != 0 &&
189 vfs_ChDir(conn,conn->origpath) != 0) {
190 DEBUG(((errno!=EACCES)?0:3),("chdir (%s) failed, reason: %s\n",
191 conn->connectpath, strerror(errno)));
192 return(False);
193 }
194
195 if ((conn == last_conn) && (last_flags == flags)) {
196 return(True);
197 }
198
199 last_conn = conn;
200 last_flags = flags;
201
202 /* Obey the client case sensitivity requests - only for clients that support it. */
203 switch (lp_casesensitive(snum)) {
204 case Auto:
205 {
206 /* We need this uglyness due to DOS/Win9x clients that lie about case insensitivity. */
207 enum remote_arch_types ra_type = get_remote_arch();
208 if ((ra_type != RA_SAMBA) && (ra_type != RA_CIFSFS)) {
209 /* Client can't support per-packet case sensitive pathnames. */
210 conn->case_sensitive = False;
211 } else {
212 conn->case_sensitive = !(flags & FLAG_CASELESS_PATHNAMES);
213 }
214 }
215 break;
216 case True:
217 conn->case_sensitive = True;
218 break;
219 default:
220 conn->case_sensitive = False;
221 break;
222 }
223 return(True);
224 }
225
226 static int load_registry_service(const char *servicename)
227 {
228 if (!lp_registry_shares()) {
229 return -1;
230 }
231
232 if ((servicename == NULL) || (*servicename == '\0')) {
233 return -1;
234 }
235
236 if (strequal(servicename, GLOBAL_NAME)) {
237 return -2;
238 }
239
240 if (!process_registry_service(servicename)) {
241 return -1;
242 }
243
244 return lp_servicenumber(servicename);
245 }
246
247 void load_registry_shares(void)
248 {
249 DEBUG(8, ("load_registry_shares()\n"));
250 if (!lp_registry_shares()) {
251 return;
252 }
253
254 process_registry_shares();
255
256 return;
257 }
258
259 /****************************************************************************
260 Add a home service. Returns the new service number or -1 if fail.
261 ****************************************************************************/
262
263 int add_home_service(const char *service, const char *username, const char *homedir)
264 {
265 int iHomeService;
266
267 if (!service || !homedir || homedir[0] == '\0')
268 return -1;
269
270 if ((iHomeService = lp_servicenumber(HOMES_NAME)) < 0) {
271 if ((iHomeService = load_registry_service(HOMES_NAME)) < 0) {
272 return -1;
273 }
274 }
275
276 /*
277 * If this is a winbindd provided username, remove
278 * the domain component before adding the service.
279 * Log a warning if the "path=" parameter does not
280 * include any macros.
281 */
282
283 {
284 const char *p = strchr(service,*lp_winbind_separator());
285
286 /* We only want the 'user' part of the string */
287 if (p) {
288 service = p + 1;
289 }
290 }
291
292 if (!lp_add_home(service, iHomeService, username, homedir)) {
293 return -1;
294 }
295
296 return lp_servicenumber(service);
297
298 }
299
300 /**
301 * Find a service entry.
302 *
303 * @param service is modified (to canonical form??)
304 **/
305
306 int find_service(fstring service)
307 {
308 int iService;
309
310 all_string_sub(service,"\\","/",0);
311
312 iService = lp_servicenumber(service);
313
314 /* now handle the special case of a home directory */
315 if (iService < 0) {
316 char *phome_dir = get_user_home_dir(talloc_tos(), service);
317
318 if(!phome_dir) {
319 /*
320 * Try mapping the servicename, it may
321 * be a Windows to unix mapped user name.
322 */
323 if(map_username(service))
324 phome_dir = get_user_home_dir(
325 talloc_tos(), service);
326 }
327
328 DEBUG(3,("checking for home directory %s gave %s\n",service,
329 phome_dir?phome_dir:"(NULL)"));
330
331 iService = add_home_service(service,service /* 'username' */, phome_dir);
332 }
333
334 /* If we still don't have a service, attempt to add it as a printer. */
335 if (iService < 0) {
336 int iPrinterService;
337
338 if ((iPrinterService = lp_servicenumber(PRINTERS_NAME)) < 0) {
339 iPrinterService = load_registry_service(PRINTERS_NAME);
340 }
341 if (iPrinterService >= 0) {
342 DEBUG(3,("checking whether %s is a valid printer name...\n", service));
343 if (pcap_printername_ok(service)) {
344 DEBUG(3,("%s is a valid printer name\n", service));
345 DEBUG(3,("adding %s as a printer service\n", service));
346 lp_add_printer(service, iPrinterService);
347 iService = lp_servicenumber(service);
348 if (iService < 0) {
349 DEBUG(0,("failed to add %s as a printer service!\n", service));
350 }
351 } else {
352 DEBUG(3,("%s is not a valid printer name\n", service));
353 }
354 }
355 }
356
357 /* Check for default vfs service? Unsure whether to implement this */
358 if (iService < 0) {
359 }
360
361 if (iService < 0) {
362 iService = load_registry_service(service);
363 }
364
365 /* Is it a usershare service ? */
366 if (iService < 0 && *lp_usershare_path()) {
367 /* Ensure the name is canonicalized. */
368 strlower_m(service);
369 iService = load_usershare_service(service);
370 }
371
372 /* just possibly it's a default service? */
373 if (iService < 0) {
374 char *pdefservice = lp_defaultservice();
375 if (pdefservice && *pdefservice && !strequal(pdefservice,service) && !strstr_m(service,"..")) {
376 /*
377 * We need to do a local copy here as lp_defaultservice()
378 * returns one of the rotating lp_string buffers that
379 * could get overwritten by the recursive find_service() call
380 * below. Fix from Josef Hinteregger <joehtg@joehtg.co.at>.
381 */
382 char *defservice = SMB_STRDUP(pdefservice);
383
384 if (!defservice) {
385 goto fail;
386 }
387
388 /* Disallow anything except explicit share names. */
389 if (strequal(defservice,HOMES_NAME) ||
390 strequal(defservice, PRINTERS_NAME) ||
391 strequal(defservice, "IPC$")) {
392 SAFE_FREE(defservice);
393 goto fail;
394 }
395
396 iService = find_service(defservice);
397 if (iService >= 0) {
398 all_string_sub(service, "_","/",0);
399 iService = lp_add_service(service, iService);
400 }
401 SAFE_FREE(defservice);
402 }
403 }
404
405 if (iService >= 0) {
406 if (!VALID_SNUM(iService)) {
407 DEBUG(0,("Invalid snum %d for %s\n",iService, service));
408 iService = -1;
409 }
410 }
411
412 fail:
413
414 if (iService < 0)
415 DEBUG(3,("find_service() failed to find service %s\n", service));
416
417 return (iService);
418 }
419
420
421 /****************************************************************************
422 do some basic sainity checks on the share.
423 This function modifies dev, ecode.
424 ****************************************************************************/
425
426 static NTSTATUS share_sanity_checks(int snum, fstring dev)
427 {
428 if (!lp_snum_ok(snum) ||
429 !check_access(smbd_server_fd(),
430 lp_hostsallow(snum), lp_hostsdeny(snum))) {
431 return NT_STATUS_ACCESS_DENIED;
432 }
433
434 if (dev[0] == '?' || !dev[0]) {
435 if (lp_print_ok(snum)) {
436 fstrcpy(dev,"LPT1:");
437 } else if (strequal(lp_fstype(snum), "IPC")) {
438 fstrcpy(dev, "IPC");
439 } else {
440 fstrcpy(dev,"A:");
441 }
442 }
443
444 strupper_m(dev);
445
446 if (lp_print_ok(snum)) {
447 if (!strequal(dev, "LPT1:")) {
448 return NT_STATUS_BAD_DEVICE_TYPE;
449 }
450 } else if (strequal(lp_fstype(snum), "IPC")) {
451 if (!strequal(dev, "IPC")) {
452 return NT_STATUS_BAD_DEVICE_TYPE;
453 }
454 } else if (!strequal(dev, "A:")) {
455 return NT_STATUS_BAD_DEVICE_TYPE;
456 }
457
458 /* Behave as a printer if we are supposed to */
459 if (lp_print_ok(snum) && (strcmp(dev, "A:") == 0)) {
460 fstrcpy(dev, "LPT1:");
461 }
462
463 return NT_STATUS_OK;
464 }
465
466 /*
467 * Go through lookup_name etc to find the force'd group.
468 *
469 * Create a new token from src_token, replacing the primary group sid with the
470 * one found.
471 */
472
473 static NTSTATUS find_forced_group(bool force_user,
474 int snum, const char *username,
475 struct dom_sid *pgroup_sid,
476 gid_t *pgid)
477 {
478 NTSTATUS result = NT_STATUS_NO_SUCH_GROUP;
479 TALLOC_CTX *frame = talloc_stackframe();
480 struct dom_sid group_sid;
481 enum lsa_SidType type;
482 char *groupname;
483 bool user_must_be_member = False;
484 gid_t gid;
485
486 groupname = talloc_strdup(talloc_tos(), lp_force_group(snum));
487 if (groupname == NULL) {
488 DEBUG(1, ("talloc_strdup failed\n"));
489 result = NT_STATUS_NO_MEMORY;
490 goto done;
491 }
492
493 if (groupname[0] == '+') {
494 user_must_be_member = True;
495 groupname += 1;
496 }
497
498 groupname = talloc_string_sub(talloc_tos(), groupname,
499 "%S", lp_servicename(snum));
500 if (groupname == NULL) {
501 DEBUG(1, ("talloc_string_sub failed\n"));
502 result = NT_STATUS_NO_MEMORY;
503 goto done;
504 }
505
506 if (!lookup_name_smbconf(talloc_tos(), groupname,
507 LOOKUP_NAME_ALL|LOOKUP_NAME_GROUP,
508 NULL, NULL, &group_sid, &type)) {
509 DEBUG(10, ("lookup_name_smbconf(%s) failed\n",
510 groupname));
511 goto done;
512 }
513
514 if ((type != SID_NAME_DOM_GRP) && (type != SID_NAME_ALIAS) &&
515 (type != SID_NAME_WKN_GRP)) {
516 DEBUG(10, ("%s is a %s, not a group\n", groupname,
517 sid_type_lookup(type)));
518 goto done;
519 }
520
521 if (!sid_to_gid(&group_sid, &gid)) {
522 DEBUG(10, ("sid_to_gid(%s) for %s failed\n",
523 sid_string_dbg(&group_sid), groupname));
524 goto done;
525 }
526
527 /*
528 * If the user has been forced and the forced group starts with a '+',
529 * then we only set the group to be the forced group if the forced
530 * user is a member of that group. Otherwise, the meaning of the '+'
531 * would be ignored.
532 */
533
534 if (force_user && user_must_be_member) {
535 if (user_in_group_sid(username, &group_sid)) {
536 sid_copy(pgroup_sid, &group_sid);
537 *pgid = gid;
538 DEBUG(3,("Forced group %s for member %s\n",
539 groupname, username));
540 } else {
541 DEBUG(0,("find_forced_group: forced user %s is not a member "
542 "of forced group %s. Disallowing access.\n",
543 username, groupname ));
544 result = NT_STATUS_MEMBER_NOT_IN_GROUP;
545 goto done;
546 }
547 } else {
548 sid_copy(pgroup_sid, &group_sid);
549 *pgid = gid;
550 DEBUG(3,("Forced group %s\n", groupname));
551 }
552
553 result = NT_STATUS_OK;
554 done:
555 TALLOC_FREE(frame);
556 return result;
557 }
558
559 /****************************************************************************
560 Create an auth_serversupplied_info structure for a connection_struct
561 ****************************************************************************/
562
563 static NTSTATUS create_connection_server_info(struct smbd_server_connection *sconn,
564 TALLOC_CTX *mem_ctx, int snum,
565 struct auth_serversupplied_info *vuid_serverinfo,
566 DATA_BLOB password,
567 struct auth_serversupplied_info **presult)
568 {
569 if (lp_guest_only(snum)) {
570 return make_server_info_guest(mem_ctx, presult);
571 }
572
573 if (vuid_serverinfo != NULL) {
574
575 struct auth_serversupplied_info *result;
576
577 /*
578 * This is the normal security != share case where we have a
579 * valid vuid from the session setup. */
580
581 if (vuid_serverinfo->guest) {
582 if (!lp_guest_ok(snum)) {
583 DEBUG(2, ("guest user (from session setup) "
584 "not permitted to access this share "
585 "(%s)\n", lp_servicename(snum)));
586 return NT_STATUS_ACCESS_DENIED;
587 }
588 } else {
589 if (!user_ok_token(vuid_serverinfo->unix_name,
590 vuid_serverinfo->info3->base.domain.string,
591 vuid_serverinfo->ptok, snum)) {
592 DEBUG(2, ("user '%s' (from session setup) not "
593 "permitted to access this share "
594 "(%s)\n",
595 vuid_serverinfo->unix_name,
596 lp_servicename(snum)));
597 return NT_STATUS_ACCESS_DENIED;
598 }
599 }
600
601 result = copy_serverinfo(mem_ctx, vuid_serverinfo);
602 if (result == NULL) {
603 return NT_STATUS_NO_MEMORY;
604 }
605
606 *presult = result;
607 return NT_STATUS_OK;
608 }
609
610 if (lp_security() == SEC_SHARE) {
611
612 fstring user;
613 bool guest;
614
615 /* add the sharename as a possible user name if we
616 are in share mode security */
617
618 add_session_user(sconn, lp_servicename(snum));
619
620 /* shall we let them in? */
621
622 if (!authorise_login(sconn, snum,user,password,&guest)) {
623 DEBUG( 2, ( "Invalid username/password for [%s]\n",
624 lp_servicename(snum)) );
625 return NT_STATUS_WRONG_PASSWORD;
626 }
627
628 return make_serverinfo_from_username(mem_ctx, user, guest,
629 presult);
630 }
631
632 DEBUG(0, ("invalid VUID (vuser) but not in security=share\n"));
633 return NT_STATUS_ACCESS_DENIED;
634 }
635
636
637 /****************************************************************************
638 Make a connection, given the snum to connect to, and the vuser of the
639 connecting user if appropriate.
640 ****************************************************************************/
641
642 connection_struct *make_connection_snum(struct smbd_server_connection *sconn,
643 int snum, user_struct *vuser,
644 DATA_BLOB password,
645 const char *pdev,
646 NTSTATUS *pstatus)
647 {
648 connection_struct *conn = NULL;
649 struct smb_filename *smb_fname_cpath = NULL;
650 fstring dev;
651 int ret;
652 char addr[INET6_ADDRSTRLEN];
653 bool on_err_call_dis_hook = false;
654 bool claimed_connection = false;
655 uid_t effuid;
656 gid_t effgid;
657 NTSTATUS status;
658
659 fstrcpy(dev, pdev);
660
661 if (NT_STATUS_IS_ERR(*pstatus = share_sanity_checks(snum, dev))) {
662 goto err_root_exit;
663 }
664
665 conn = conn_new(sconn);
666 if (!conn) {
667 DEBUG(0,("Couldn't find free connection.\n"));
668 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
669 goto err_root_exit;
670 }
671
672 conn->params->service = snum;
673
674 status = create_connection_server_info(sconn,
675 conn, snum, vuser ? vuser->server_info : NULL, password,
676 &conn->server_info);
677
678 if (!NT_STATUS_IS_OK(status)) {
679 DEBUG(1, ("create_connection_server_info failed: %s\n",
680 nt_errstr(status)));
681 *pstatus = status;
682 goto err_root_exit;
683 }
684
685 if ((lp_guest_only(snum)) || (lp_security() == SEC_SHARE)) {
686 conn->force_user = true;
687 }
688
689 add_session_user(sconn, conn->server_info->unix_name);
690
691 safe_strcpy(conn->client_address,
692 client_addr(get_client_fd(),addr,sizeof(addr)),
693 sizeof(conn->client_address)-1);
694 conn->num_files_open = 0;
695 conn->lastused = conn->lastused_count = time(NULL);
696 conn->used = True;
697 conn->printer = (strncmp(dev,"LPT",3) == 0);
698 conn->ipc = ( (strncmp(dev,"IPC",3) == 0) ||
699 ( lp_enable_asu_support() && strequal(dev,"ADMIN$")) );
700
701 /* Case options for the share. */
702 if (lp_casesensitive(snum) == Auto) {
703 /* We will be setting this per packet. Set to be case
704 * insensitive for now. */
705 conn->case_sensitive = False;
706 } else {
707 conn->case_sensitive = (bool)lp_casesensitive(snum);
708 }
709
710 conn->case_preserve = lp_preservecase(snum);
711 conn->short_case_preserve = lp_shortpreservecase(snum);
712
713 conn->encrypt_level = lp_smb_encrypt(snum);
714
715 conn->veto_list = NULL;
716 conn->hide_list = NULL;
717 conn->veto_oplock_list = NULL;
718 conn->aio_write_behind_list = NULL;
719
720 conn->read_only = lp_readonly(SNUM(conn));
721
722 if (*lp_force_user(snum)) {
723
724 /*
725 * Replace conn->server_info with a completely faked up one
726 * from the username we are forced into :-)
727 */
728
729 char *fuser;
730 struct auth_serversupplied_info *forced_serverinfo;
731
732 fuser = talloc_string_sub(conn, lp_force_user(snum), "%S",
733 lp_servicename(snum));
734 if (fuser == NULL) {
735 *pstatus = NT_STATUS_NO_MEMORY;
736 goto err_root_exit;
737 }
738
739 status = make_serverinfo_from_username(
740 conn, fuser, conn->server_info->guest,
741 &forced_serverinfo);
742 if (!NT_STATUS_IS_OK(status)) {
743 *pstatus = status;
744 goto err_root_exit;
745 }
746
747 TALLOC_FREE(conn->server_info);
748 conn->server_info = forced_serverinfo;
749
750 conn->force_user = True;
751 DEBUG(3,("Forced user %s\n", fuser));
752 }
753
754 /*
755 * If force group is true, then override
756 * any groupid stored for the connecting user.
757 */
758
759 if (*lp_force_group(snum)) {
760
761 status = find_forced_group(
762 conn->force_user, snum, conn->server_info->unix_name,
763 &conn->server_info->ptok->user_sids[1],
764 &conn->server_info->utok.gid);
765
766 if (!NT_STATUS_IS_OK(status)) {
767 *pstatus = status;
768 goto err_root_exit;
769 }
770
771 /*
772 * We need to cache this gid, to use within
773 * change_to_user() separately from the conn->server_info
774 * struct. We only use conn->server_info directly if
775 * "force_user" was set.
776 */
777 conn->force_group_gid = conn->server_info->utok.gid;
778 }
779
780 conn->vuid = (vuser != NULL) ? vuser->vuid : UID_FIELD_INVALID;
781
782 {
783 char *s = talloc_sub_advanced(talloc_tos(),
784 lp_servicename(SNUM(conn)),
785 conn->server_info->unix_name,
786 conn->connectpath,
787 conn->server_info->utok.gid,
788 conn->server_info->sanitized_username,
789 conn->server_info->info3->base.domain.string,
790 lp_pathname(snum));
791 if (!s) {
792 *pstatus = NT_STATUS_NO_MEMORY;
793 goto err_root_exit;
794 }
795
796 if (!set_conn_connectpath(conn,s)) {
797 TALLOC_FREE(s);
798 *pstatus = NT_STATUS_NO_MEMORY;
799 goto err_root_exit;
800 }
801 DEBUG(3,("Connect path is '%s' for service [%s]\n",s,
802 lp_servicename(snum)));
803 TALLOC_FREE(s);
804 }
805
806 /*
807 * New code to check if there's a share security descripter
808 * added from NT server manager. This is done after the
809 * smb.conf checks are done as we need a uid and token. JRA.
810 *
811 */
812
813 {
814 bool can_write = False;
815
816 can_write = share_access_check(conn->server_info->ptok,
817 lp_servicename(snum),
818 FILE_WRITE_DATA);
819
820 if (!can_write) {
821 if (!share_access_check(conn->server_info->ptok,
822 lp_servicename(snum),
823 FILE_READ_DATA)) {
824 /* No access, read or write. */
825 DEBUG(0,("make_connection: connection to %s "
826 "denied due to security "
827 "descriptor.\n",
828 lp_servicename(snum)));
829 *pstatus = NT_STATUS_ACCESS_DENIED;
830 goto err_root_exit;
831 } else {
832 conn->read_only = True;
833 }
834 }
835 }
836 /* Initialise VFS function pointers */
837
838 if (!smbd_vfs_init(conn)) {
839 DEBUG(0, ("vfs_init failed for service %s\n",
840 lp_servicename(snum)));
841 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
842 goto err_root_exit;
843 }
844
845 /* ROOT Activities: */
846 /* explicitly check widelinks here so that we can correctly warn
847 * in the logs. */
848 widelinks_warning(snum);
849
850 /*
851 * Enforce the max connections parameter.
852 */
853
854 if ((lp_max_connections(snum) > 0)
855 && (count_current_connections(lp_servicename(SNUM(conn)), True) >=
856 lp_max_connections(snum))) {
857
858 DEBUG(1, ("Max connections (%d) exceeded for %s\n",
859 lp_max_connections(snum), lp_servicename(snum)));
860 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
861 goto err_root_exit;
862 }
863
864 /*
865 * Get us an entry in the connections db
866 */
867 if (!claim_connection(conn, lp_servicename(snum), 0)) {
868 DEBUG(1, ("Could not store connections entry\n"));
869 *pstatus = NT_STATUS_INTERNAL_DB_ERROR;
870 goto err_root_exit;
871 }
872 claimed_connection = true;
873
874 /* Invoke VFS make connection hook - this must be the first
875 filesystem operation that we do. */
876
877 if (SMB_VFS_CONNECT(conn, lp_servicename(snum),
878 conn->server_info->unix_name) < 0) {
879 DEBUG(0,("make_connection: VFS make connection failed!\n"));
880 *pstatus = NT_STATUS_UNSUCCESSFUL;
881 goto err_root_exit;
882 }
883
884 /* Any error exit after here needs to call the disconnect hook. */
885 on_err_call_dis_hook = true;
886
887 if ((!conn->printer) && (!conn->ipc)) {
888 conn->notify_ctx = notify_init(conn, procid_self(),
889 smbd_messaging_context(),
890 smbd_event_context(),
891 conn);
892 }
893
894 /*
895 * Fix compatibility issue pointed out by Volker.
896 * We pass the conn->connectpath to the preexec
897 * scripts as a parameter, so attempt to canonicalize
898 * it here before calling the preexec scripts.
899 * We ignore errors here, as it is possible that
900 * the conn->connectpath doesn't exist yet and
901 * the preexec scripts will create them.
902 */
903
904 (void)canonicalize_connect_path(conn);
905
906 /* Preexecs are done here as they might make the dir we are to ChDir
907 * to below */
908 /* execute any "root preexec = " line */
909 if (*lp_rootpreexec(snum)) {
910 char *cmd = talloc_sub_advanced(talloc_tos(),
911 lp_servicename(SNUM(conn)),
912 conn->server_info->unix_name,
913 conn->connectpath,
914 conn->server_info->utok.gid,
915 conn->server_info->sanitized_username,
916 conn->server_info->info3->base.domain.string,
917 lp_rootpreexec(snum));
918 DEBUG(5,("cmd=%s\n",cmd));
919 ret = smbrun(cmd,NULL);
920 TALLOC_FREE(cmd);
921 if (ret != 0 && lp_rootpreexec_close(snum)) {
922 DEBUG(1,("root preexec gave %d - failing "
923 "connection\n", ret));
924 *pstatus = NT_STATUS_ACCESS_DENIED;
925 goto err_root_exit;
926 }
927 }
928
929 /* USER Activites: */
930 if (!change_to_user(conn, conn->vuid)) {
931 /* No point continuing if they fail the basic checks */
932 DEBUG(0,("Can't become connected user!\n"));
933 *pstatus = NT_STATUS_LOGON_FAILURE;
934 goto err_root_exit;
935 }
936
937 effuid = geteuid();
938 effgid = getegid();
939
940 /* Remember that a different vuid can connect later without these
941 * checks... */
942
943 /* Preexecs are done here as they might make the dir we are to ChDir
944 * to below */
945
946 /* execute any "preexec = " line */
947 if (*lp_preexec(snum)) {
948 char *cmd = talloc_sub_advanced(talloc_tos(),
949 lp_servicename(SNUM(conn)),
950 conn->server_info->unix_name,
951 conn->connectpath,
952 conn->server_info->utok.gid,
953 conn->server_info->sanitized_username,
954 conn->server_info->info3->base.domain.string,
955 lp_preexec(snum));
956 ret = smbrun(cmd,NULL);
957 TALLOC_FREE(cmd);
958 if (ret != 0 && lp_preexec_close(snum)) {
959 DEBUG(1,("preexec gave %d - failing connection\n",
960 ret));
961 *pstatus = NT_STATUS_ACCESS_DENIED;
962 goto err_root_exit;
963 }
964 }
965
966 #ifdef WITH_FAKE_KASERVER
967 if (lp_afs_share(snum)) {
968 afs_login(conn);
969 }
970 #endif
971
972 /*
973 * we've finished with the user stuff - go back to root
974 * so the SMB_VFS_STAT call will only fail on path errors,
975 * not permission problems.
976 */
977 change_to_root_user();
978 /* ROOT Activites: */
979
980 /*
981 * If widelinks are disallowed we need to canonicalise the connect
982 * path here to ensure we don't have any symlinks in the
983 * connectpath. We will be checking all paths on this connection are
984 * below this directory. We must do this after the VFS init as we
985 * depend on the realpath() pointer in the vfs table. JRA.
986 */
987 if (!lp_widelinks(snum)) {
988 if (!canonicalize_connect_path(conn)) {
989 DEBUG(0, ("canonicalize_connect_path failed "
990 "for service %s, path %s\n",
991 lp_servicename(snum),
992 conn->connectpath));
993 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
994 goto err_root_exit;
995 }
996 }
997
998 /* Add veto/hide lists */
999 if (!IS_IPC(conn) && !IS_PRINT(conn)) {
1000 set_namearray( &conn->veto_list, lp_veto_files(snum));
1001 set_namearray( &conn->hide_list, lp_hide_files(snum));
1002 set_namearray( &conn->veto_oplock_list, lp_veto_oplocks(snum));
1003 set_namearray( &conn->aio_write_behind_list,
1004 lp_aio_write_behind(snum));
1005 }
1006 status = create_synthetic_smb_fname(talloc_tos(), conn->connectpath,
1007 NULL, NULL, &smb_fname_cpath);
1008 if (!NT_STATUS_IS_OK(status)) {
1009 *pstatus = status;
1010 goto err_root_exit;
1011 }
1012
1013 /* win2000 does not check the permissions on the directory
1014 during the tree connect, instead relying on permission
1015 check during individual operations. To match this behaviour
1016 I have disabled this chdir check (tridge) */
1017 /* the alternative is just to check the directory exists */
1018
1019 if ((ret = SMB_VFS_STAT(conn, smb_fname_cpath)) != 0 ||
1020 !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
1021 if (ret == 0 && !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
1022 DEBUG(0,("'%s' is not a directory, when connecting to "
1023 "[%s]\n", conn->connectpath,
1024 lp_servicename(snum)));
1025 } else {
1026 DEBUG(0,("'%s' does not exist or permission denied "
1027 "when connecting to [%s] Error was %s\n",
1028 conn->connectpath, lp_servicename(snum),
1029 strerror(errno) ));
1030 }
1031 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
1032 goto err_root_exit;
1033 }
1034 conn->base_share_dev = smb_fname_cpath->st.st_ex_dev;
1035
1036 string_set(&conn->origpath,conn->connectpath);
1037
1038 /* Figure out the characteristics of the underlying filesystem. This
1039 * assumes that all the filesystem mounted withing a share path have
1040 * the same characteristics, which is likely but not guaranteed.
1041 */
1042
1043 conn->fs_capabilities = SMB_VFS_FS_CAPABILITIES(conn, &conn->ts_res);
1044
1045 /*
1046 * Print out the 'connected as' stuff here as we need
1047 * to know the effective uid and gid we will be using
1048 * (at least initially).
1049 */
1050
1051 if( DEBUGLVL( IS_IPC(conn) ? 3 : 1 ) ) {
1052 dbgtext( "%s (%s) ", get_remote_machine_name(),
1053 conn->client_address );
1054 dbgtext( "%s", srv_is_signing_active(sconn) ? "signed " : "");
1055 dbgtext( "connect to service %s ", lp_servicename(snum) );
1056 dbgtext( "initially as user %s ",
1057 conn->server_info->unix_name );
1058 dbgtext( "(uid=%d, gid=%d) ", (int)effuid, (int)effgid );
1059 dbgtext( "(pid %d)\n", (int)sys_getpid() );
1060 }
1061
1062 return(conn);
1063
1064 err_root_exit:
1065 TALLOC_FREE(smb_fname_cpath);
1066 /* We must exit this function as root. */
1067 if (geteuid() != 0) {
1068 change_to_root_user();
1069 }
1070 if (on_err_call_dis_hook) {
1071 /* Call VFS disconnect hook */
1072 SMB_VFS_DISCONNECT(conn);
1073 }
1074 if (claimed_connection) {
1075 yield_connection(conn, lp_servicename(snum));
1076 }
1077 if (conn) {
1078 conn_free(conn);
1079 }
1080 return NULL;
1081 }
1082
1083 /****************************************************************************
1084 Make a connection to a service.
1085 *
1086 * @param service
1087 ****************************************************************************/
1088
1089 connection_struct *make_connection(struct smbd_server_connection *sconn,
1090 const char *service_in, DATA_BLOB password,
1091 const char *pdev, uint16 vuid,
1092 NTSTATUS *status)
1093 {
1094 uid_t euid;
1095 user_struct *vuser = NULL;
1096 fstring service;
1097 fstring dev;
1098 int snum = -1;
1099 char addr[INET6_ADDRSTRLEN];
1100
1101 fstrcpy(dev, pdev);
1102
1103 /* This must ONLY BE CALLED AS ROOT. As it exits this function as
1104 * root. */
1105 if (!non_root_mode() && (euid = geteuid()) != 0) {
1106 DEBUG(0,("make_connection: PANIC ERROR. Called as nonroot "
1107 "(%u)\n", (unsigned int)euid ));
1108 smb_panic("make_connection: PANIC ERROR. Called as nonroot\n");
1109 }
1110
1111 if (conn_num_open(sconn) > 2047) {
1112 *status = NT_STATUS_INSUFF_SERVER_RESOURCES;
1113 return NULL;
1114 }
1115
1116 if(lp_security() != SEC_SHARE) {
1117 vuser = get_valid_user_struct(sconn, vuid);
1118 if (!vuser) {
1119 DEBUG(1,("make_connection: refusing to connect with "
1120 "no session setup\n"));
1121 *status = NT_STATUS_ACCESS_DENIED;
1122 return NULL;
1123 }
1124 }
1125
1126 /* Logic to try and connect to the correct [homes] share, preferably
1127 without too many getpwnam() lookups. This is particulary nasty for
1128 winbind usernames, where the share name isn't the same as unix
1129 username.
1130
1131 The snum of the homes share is stored on the vuser at session setup
1132 time.
1133 */
1134
1135 if (strequal(service_in,HOMES_NAME)) {
1136 if(lp_security() != SEC_SHARE) {
1137 DATA_BLOB no_pw = data_blob_null;
1138 if (vuser->homes_snum == -1) {
1139 DEBUG(2, ("[homes] share not available for "
1140 "this user because it was not found "
1141 "or created at session setup "
1142 "time\n"));
1143 *status = NT_STATUS_BAD_NETWORK_NAME;
1144 return NULL;
1145 }
1146 DEBUG(5, ("making a connection to [homes] service "
1147 "created at session setup time\n"));
1148 return make_connection_snum(sconn,
1149 vuser->homes_snum,
1150 vuser, no_pw,
1151 dev, status);
1152 } else {
1153 /* Security = share. Try with
1154 * current_user_info.smb_name as the username. */
1155 if (*current_user_info.smb_name) {
1156 fstring unix_username;
1157 fstrcpy(unix_username,
1158 current_user_info.smb_name);
1159 map_username(unix_username);
1160 snum = find_service(unix_username);
1161 }
1162 if (snum != -1) {
1163 DEBUG(5, ("making a connection to 'homes' "
1164 "service %s based on "
1165 "security=share\n", service_in));
1166 return make_connection_snum(sconn,
1167 snum, NULL,
1168 password,
1169 dev, status);
1170 }
1171 }
1172 } else if ((lp_security() != SEC_SHARE) && (vuser->homes_snum != -1)
1173 && strequal(service_in,
1174 lp_servicename(vuser->homes_snum))) {
1175 DATA_BLOB no_pw = data_blob_null;
1176 DEBUG(5, ("making a connection to 'homes' service [%s] "
1177 "created at session setup time\n", service_in));
1178 return make_connection_snum(sconn,
1179 vuser->homes_snum,
1180 vuser, no_pw,
1181 dev, status);
1182 }
1183
1184 fstrcpy(service, service_in);
1185
1186 strlower_m(service);
1187
1188 snum = find_service(service);
1189
1190 if (snum < 0) {
1191 if (strequal(service,"IPC$") ||
1192 (lp_enable_asu_support() && strequal(service,"ADMIN$"))) {
1193 DEBUG(3,("refusing IPC connection to %s\n", service));
1194 *status = NT_STATUS_ACCESS_DENIED;
1195 return NULL;
1196 }
1197
1198 DEBUG(3,("%s (%s) couldn't find service %s\n",
1199 get_remote_machine_name(),
1200 client_addr(get_client_fd(),addr,sizeof(addr)),
1201 service));
1202 *status = NT_STATUS_BAD_NETWORK_NAME;
1203 return NULL;
1204 }
1205
1206 /* Handle non-Dfs clients attempting connections to msdfs proxy */
1207 if (lp_host_msdfs() && (*lp_msdfs_proxy(snum) != '\0')) {
1208 DEBUG(3, ("refusing connection to dfs proxy share '%s' "
1209 "(pointing to %s)\n",
1210 service, lp_msdfs_proxy(snum)));
1211 *status = NT_STATUS_BAD_NETWORK_NAME;
1212 return NULL;
1213 }
1214
1215 DEBUG(5, ("making a connection to 'normal' service %s\n", service));
1216
1217 return make_connection_snum(sconn, snum, vuser,
1218 password,
1219 dev, status);
1220 }
1221
1222 /****************************************************************************
1223 Close a cnum.
1224 ****************************************************************************/
1225
1226 void close_cnum(connection_struct *conn, uint16 vuid)
1227 {
1228 file_close_conn(conn);
1229
1230 if (!IS_IPC(conn)) {
1231 dptr_closecnum(conn);
1232 }
1233
1234 change_to_root_user();
1235
1236 DEBUG(IS_IPC(conn)?3:1, ("%s (%s) closed connection to service %s\n",
1237 get_remote_machine_name(),
1238 conn->client_address,
1239 lp_servicename(SNUM(conn))));
1240
1241 /* Call VFS disconnect hook */
1242 SMB_VFS_DISCONNECT(conn);
1243
1244 yield_connection(conn, lp_servicename(SNUM(conn)));
1245
1246 /* make sure we leave the directory available for unmount */
1247 vfs_ChDir(conn, "/");
1248
1249 /* execute any "postexec = " line */
1250 if (*lp_postexec(SNUM(conn)) &&
1251 change_to_user(conn, vuid)) {
1252 char *cmd = talloc_sub_advanced(talloc_tos(),
1253 lp_servicename(SNUM(conn)),
1254 conn->server_info->unix_name,
1255 conn->connectpath,
1256 conn->server_info->utok.gid,
1257 conn->server_info->sanitized_username,
1258 conn->server_info->info3->base.domain.string,
1259 lp_postexec(SNUM(conn)));
1260 smbrun(cmd,NULL);
1261 TALLOC_FREE(cmd);
1262 change_to_root_user();
1263 }
1264
1265 change_to_root_user();
1266 /* execute any "root postexec = " line */
1267 if (*lp_rootpostexec(SNUM(conn))) {
1268 char *cmd = talloc_sub_advanced(talloc_tos(),
1269 lp_servicename(SNUM(conn)),
1270 conn->server_info->unix_name,
1271 conn->connectpath,
1272 conn->server_info->utok.gid,
1273 conn->server_info->sanitized_username,
1274 conn->server_info->info3->base.domain.string,
1275 lp_rootpostexec(SNUM(conn)));
1276 smbrun(cmd,NULL);
1277 TALLOC_FREE(cmd);
1278 }
1279
1280 conn_free(conn);
1281 }
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