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socket_wrapper: fix compiler warnings
[Samba/gbeck.git] / source3 / smbd / service.c
blobe713b7132e9024d23b26f4d96985fa600cb1574c
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 /****************************************************************************
664 Make a connection, given the snum to connect to, and the vuser of the
665 connecting user if appropriate.
666 ****************************************************************************/
667
668 connection_struct *make_connection_snum(struct smbd_server_connection *sconn,
669 int snum, user_struct *vuser,
670 DATA_BLOB password,
671 const char *pdev,
672 NTSTATUS *pstatus)
673 {
674 connection_struct *conn = NULL;
675 struct smb_filename *smb_fname_cpath = NULL;
676 fstring dev;
677 int ret;
678 bool on_err_call_dis_hook = false;
679 bool claimed_connection = false;
680 uid_t effuid;
681 gid_t effgid;
682 NTSTATUS status;
683
684 fstrcpy(dev, pdev);
685
686 *pstatus = share_sanity_checks(&sconn->client_id, snum, dev);
687 if (NT_STATUS_IS_ERR(*pstatus)) {
688 goto err_root_exit;
689 }
690
691 conn = conn_new(sconn);
692 if (!conn) {
693 DEBUG(0,("Couldn't find free connection.\n"));
694 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
695 goto err_root_exit;
696 }
697
698 conn->params->service = snum;
699
700 status = create_connection_session_info(sconn,
701 conn, snum, vuser ? vuser->session_info : NULL, password,
702 &conn->session_info);
703
704 if (!NT_STATUS_IS_OK(status)) {
705 DEBUG(1, ("create_connection_session_info failed: %s\n",
706 nt_errstr(status)));
707 *pstatus = status;
708 goto err_root_exit;
709 }
710
711 if ((lp_guest_only(snum)) || (lp_security() == SEC_SHARE)) {
712 conn->force_user = true;
713 }
714
715 add_session_user(sconn, conn->session_info->unix_name);
716
717 conn->num_files_open = 0;
718 conn->lastused = conn->lastused_count = time(NULL);
719 conn->used = True;
720 conn->printer = (strncmp(dev,"LPT",3) == 0);
721 conn->ipc = ( (strncmp(dev,"IPC",3) == 0) ||
722 ( lp_enable_asu_support() && strequal(dev,"ADMIN$")) );
723
724 /* Case options for the share. */
725 if (lp_casesensitive(snum) == Auto) {
726 /* We will be setting this per packet. Set to be case
727 * insensitive for now. */
728 conn->case_sensitive = False;
729 } else {
730 conn->case_sensitive = (bool)lp_casesensitive(snum);
731 }
732
733 conn->case_preserve = lp_preservecase(snum);
734 conn->short_case_preserve = lp_shortpreservecase(snum);
735
736 conn->encrypt_level = lp_smb_encrypt(snum);
737
738 conn->veto_list = NULL;
739 conn->hide_list = NULL;
740 conn->veto_oplock_list = NULL;
741 conn->aio_write_behind_list = NULL;
742
743 conn->read_only = lp_readonly(SNUM(conn));
744
745 if (*lp_force_user(snum)) {
746
747 /*
748 * Replace conn->session_info with a completely faked up one
749 * from the username we are forced into :-)
750 */
751
752 char *fuser;
753 struct auth_serversupplied_info *forced_serverinfo;
754
755 fuser = talloc_string_sub(conn, lp_force_user(snum), "%S",
756 lp_servicename(snum));
757 if (fuser == NULL) {
758 *pstatus = NT_STATUS_NO_MEMORY;
759 goto err_root_exit;
760 }
761
762 status = make_serverinfo_from_username(
763 conn, fuser, conn->session_info->guest,
764 &forced_serverinfo);
765 if (!NT_STATUS_IS_OK(status)) {
766 *pstatus = status;
767 goto err_root_exit;
768 }
769
770 TALLOC_FREE(conn->session_info);
771 conn->session_info = forced_serverinfo;
772
773 conn->force_user = True;
774 DEBUG(3,("Forced user %s\n", fuser));
775 }
776
777 /*
778 * If force group is true, then override
779 * any groupid stored for the connecting user.
780 */
781
782 if (*lp_force_group(snum)) {
783
784 status = find_forced_group(
785 conn->force_user, snum, conn->session_info->unix_name,
786 &conn->session_info->security_token->sids[1],
787 &conn->session_info->utok.gid);
788
789 if (!NT_STATUS_IS_OK(status)) {
790 *pstatus = status;
791 goto err_root_exit;
792 }
793
794 /*
795 * We need to cache this gid, to use within
796 * change_to_user() separately from the conn->session_info
797 * struct. We only use conn->session_info directly if
798 * "force_user" was set.
799 */
800 conn->force_group_gid = conn->session_info->utok.gid;
801 }
802
803 conn->vuid = (vuser != NULL) ? vuser->vuid : UID_FIELD_INVALID;
804
805 {
806 char *s = talloc_sub_advanced(talloc_tos(),
807 lp_servicename(SNUM(conn)),
808 conn->session_info->unix_name,
809 conn->connectpath,
810 conn->session_info->utok.gid,
811 conn->session_info->sanitized_username,
812 conn->session_info->info3->base.domain.string,
813 lp_pathname(snum));
814 if (!s) {
815 *pstatus = NT_STATUS_NO_MEMORY;
816 goto err_root_exit;
817 }
818
819 if (!set_conn_connectpath(conn,s)) {
820 TALLOC_FREE(s);
821 *pstatus = NT_STATUS_NO_MEMORY;
822 goto err_root_exit;
823 }
824 DEBUG(3,("Connect path is '%s' for service [%s]\n",s,
825 lp_servicename(snum)));
826 TALLOC_FREE(s);
827 }
828
829 /*
830 * New code to check if there's a share security descripter
831 * added from NT server manager. This is done after the
832 * smb.conf checks are done as we need a uid and token. JRA.
833 *
834 */
835
836 {
837 bool can_write = False;
838
839 can_write = share_access_check(conn->session_info->security_token,
840 lp_servicename(snum),
841 FILE_WRITE_DATA);
842
843 if (!can_write) {
844 if (!share_access_check(conn->session_info->security_token,
845 lp_servicename(snum),
846 FILE_READ_DATA)) {
847 /* No access, read or write. */
848 DEBUG(0,("make_connection: connection to %s "
849 "denied due to security "
850 "descriptor.\n",
851 lp_servicename(snum)));
852 *pstatus = NT_STATUS_ACCESS_DENIED;
853 goto err_root_exit;
854 } else {
855 conn->read_only = True;
856 }
857 }
858 }
859 /* Initialise VFS function pointers */
860
861 if (!smbd_vfs_init(conn)) {
862 DEBUG(0, ("vfs_init failed for service %s\n",
863 lp_servicename(snum)));
864 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
865 goto err_root_exit;
866 }
867
868 /* ROOT Activities: */
869 /* explicitly check widelinks here so that we can correctly warn
870 * in the logs. */
871 widelinks_warning(snum);
872
873 /*
874 * Enforce the max connections parameter.
875 */
876
877 if ((lp_max_connections(snum) > 0)
878 && (count_current_connections(lp_servicename(SNUM(conn)), True) >=
879 lp_max_connections(snum))) {
880
881 DEBUG(1, ("Max connections (%d) exceeded for %s\n",
882 lp_max_connections(snum), lp_servicename(snum)));
883 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
884 goto err_root_exit;
885 }
886
887 /*
888 * Get us an entry in the connections db
889 */
890 if (!claim_connection(conn, lp_servicename(snum))) {
891 DEBUG(1, ("Could not store connections entry\n"));
892 *pstatus = NT_STATUS_INTERNAL_DB_ERROR;
893 goto err_root_exit;
894 }
895 claimed_connection = true;
896
897 /* Invoke VFS make connection hook - this must be the first
898 filesystem operation that we do. */
899
900 if (SMB_VFS_CONNECT(conn, lp_servicename(snum),
901 conn->session_info->unix_name) < 0) {
902 DEBUG(0,("make_connection: VFS make connection failed!\n"));
903 *pstatus = NT_STATUS_UNSUCCESSFUL;
904 goto err_root_exit;
905 }
906
907 /* Any error exit after here needs to call the disconnect hook. */
908 on_err_call_dis_hook = true;
909
910 if ((!conn->printer) && (!conn->ipc)) {
911 conn->notify_ctx = notify_init(conn,
912 sconn_server_id(sconn),
913 sconn->msg_ctx,
914 smbd_event_context(),
915 conn);
916 }
917
918 /*
919 * Fix compatibility issue pointed out by Volker.
920 * We pass the conn->connectpath to the preexec
921 * scripts as a parameter, so attempt to canonicalize
922 * it here before calling the preexec scripts.
923 * We ignore errors here, as it is possible that
924 * the conn->connectpath doesn't exist yet and
925 * the preexec scripts will create them.
926 */
927
928 (void)canonicalize_connect_path(conn);
929
930 /* Preexecs are done here as they might make the dir we are to ChDir
931 * to below */
932 /* execute any "root preexec = " line */
933 if (*lp_rootpreexec(snum)) {
934 char *cmd = talloc_sub_advanced(talloc_tos(),
935 lp_servicename(SNUM(conn)),
936 conn->session_info->unix_name,
937 conn->connectpath,
938 conn->session_info->utok.gid,
939 conn->session_info->sanitized_username,
940 conn->session_info->info3->base.domain.string,
941 lp_rootpreexec(snum));
942 DEBUG(5,("cmd=%s\n",cmd));
943 ret = smbrun(cmd,NULL);
944 TALLOC_FREE(cmd);
945 if (ret != 0 && lp_rootpreexec_close(snum)) {
946 DEBUG(1,("root preexec gave %d - failing "
947 "connection\n", ret));
948 *pstatus = NT_STATUS_ACCESS_DENIED;
949 goto err_root_exit;
950 }
951 }
952
953 /* USER Activites: */
954 if (!change_to_user(conn, conn->vuid)) {
955 /* No point continuing if they fail the basic checks */
956 DEBUG(0,("Can't become connected user!\n"));
957 *pstatus = NT_STATUS_LOGON_FAILURE;
958 goto err_root_exit;
959 }
960
961 effuid = geteuid();
962 effgid = getegid();
963
964 /* Remember that a different vuid can connect later without these
965 * checks... */
966
967 /* Preexecs are done here as they might make the dir we are to ChDir
968 * to below */
969
970 /* execute any "preexec = " line */
971 if (*lp_preexec(snum)) {
972 char *cmd = talloc_sub_advanced(talloc_tos(),
973 lp_servicename(SNUM(conn)),
974 conn->session_info->unix_name,
975 conn->connectpath,
976 conn->session_info->utok.gid,
977 conn->session_info->sanitized_username,
978 conn->session_info->info3->base.domain.string,
979 lp_preexec(snum));
980 ret = smbrun(cmd,NULL);
981 TALLOC_FREE(cmd);
982 if (ret != 0 && lp_preexec_close(snum)) {
983 DEBUG(1,("preexec gave %d - failing connection\n",
984 ret));
985 *pstatus = NT_STATUS_ACCESS_DENIED;
986 goto err_root_exit;
987 }
988 }
989
990 #ifdef WITH_FAKE_KASERVER
991 if (lp_afs_share(snum)) {
992 afs_login(conn);
993 }
994 #endif
995
996 /*
997 * we've finished with the user stuff - go back to root
998 * so the SMB_VFS_STAT call will only fail on path errors,
999 * not permission problems.
1000 */
1001 change_to_root_user();
1002 /* ROOT Activites: */
1003
1004 /*
1005 * If widelinks are disallowed we need to canonicalise the connect
1006 * path here to ensure we don't have any symlinks in the
1007 * connectpath. We will be checking all paths on this connection are
1008 * below this directory. We must do this after the VFS init as we
1009 * depend on the realpath() pointer in the vfs table. JRA.
1010 */
1011 if (!lp_widelinks(snum)) {
1012 if (!canonicalize_connect_path(conn)) {
1013 DEBUG(0, ("canonicalize_connect_path failed "
1014 "for service %s, path %s\n",
1015 lp_servicename(snum),
1016 conn->connectpath));
1017 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
1018 goto err_root_exit;
1019 }
1020 }
1021
1022 /* Add veto/hide lists */
1023 if (!IS_IPC(conn) && !IS_PRINT(conn)) {
1024 set_namearray( &conn->veto_list, lp_veto_files(snum));
1025 set_namearray( &conn->hide_list, lp_hide_files(snum));
1026 set_namearray( &conn->veto_oplock_list, lp_veto_oplocks(snum));
1027 set_namearray( &conn->aio_write_behind_list,
1028 lp_aio_write_behind(snum));
1029 }
1030 status = create_synthetic_smb_fname(talloc_tos(), conn->connectpath,
1031 NULL, NULL, &smb_fname_cpath);
1032 if (!NT_STATUS_IS_OK(status)) {
1033 *pstatus = status;
1034 goto err_root_exit;
1035 }
1036
1037 /* win2000 does not check the permissions on the directory
1038 during the tree connect, instead relying on permission
1039 check during individual operations. To match this behaviour
1040 I have disabled this chdir check (tridge) */
1041 /* the alternative is just to check the directory exists */
1042
1043 if ((ret = SMB_VFS_STAT(conn, smb_fname_cpath)) != 0 ||
1044 !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
1045 if (ret == 0 && !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
1046 DEBUG(0,("'%s' is not a directory, when connecting to "
1047 "[%s]\n", conn->connectpath,
1048 lp_servicename(snum)));
1049 } else {
1050 DEBUG(0,("'%s' does not exist or permission denied "
1051 "when connecting to [%s] Error was %s\n",
1052 conn->connectpath, lp_servicename(snum),
1053 strerror(errno) ));
1054 }
1055 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
1056 goto err_root_exit;
1057 }
1058 conn->base_share_dev = smb_fname_cpath->st.st_ex_dev;
1059
1060 string_set(&conn->origpath,conn->connectpath);
1061
1062 /* Figure out the characteristics of the underlying filesystem. This
1063 * assumes that all the filesystem mounted withing a share path have
1064 * the same characteristics, which is likely but not guaranteed.
1065 */
1066
1067 conn->fs_capabilities = SMB_VFS_FS_CAPABILITIES(conn, &conn->ts_res);
1068
1069 /*
1070 * Print out the 'connected as' stuff here as we need
1071 * to know the effective uid and gid we will be using
1072 * (at least initially).
1073 */
1074
1075 if( DEBUGLVL( IS_IPC(conn) ? 3 : 1 ) ) {
1076 dbgtext( "%s (%s) ", get_remote_machine_name(),
1077 conn->sconn->client_id.addr );
1078 dbgtext( "%s", srv_is_signing_active(sconn) ? "signed " : "");
1079 dbgtext( "connect to service %s ", lp_servicename(snum) );
1080 dbgtext( "initially as user %s ",
1081 conn->session_info->unix_name );
1082 dbgtext( "(uid=%d, gid=%d) ", (int)effuid, (int)effgid );
1083 dbgtext( "(pid %d)\n", (int)sys_getpid() );
1084 }
1085
1086 return(conn);
1087
1088 err_root_exit:
1089 TALLOC_FREE(smb_fname_cpath);
1090 /* We must exit this function as root. */
1091 if (geteuid() != 0) {
1092 change_to_root_user();
1093 }
1094 if (on_err_call_dis_hook) {
1095 /* Call VFS disconnect hook */
1096 SMB_VFS_DISCONNECT(conn);
1097 }
1098 if (claimed_connection) {
1099 yield_connection(conn, lp_servicename(snum));
1100 }
1101 if (conn) {
1102 conn_free(conn);
1103 }
1104 return NULL;
1105 }
1106
1107 /****************************************************************************
1108 Make a connection to a service.
1109 *
1110 * @param service
1111 ****************************************************************************/
1112
1113 connection_struct *make_connection(struct smbd_server_connection *sconn,
1114 const char *service_in, DATA_BLOB password,
1115 const char *pdev, uint16 vuid,
1116 NTSTATUS *status)
1117 {
1118 uid_t euid;
1119 user_struct *vuser = NULL;
1120 char *service = NULL;
1121 fstring dev;
1122 int snum = -1;
1123
1124 fstrcpy(dev, pdev);
1125
1126 /* This must ONLY BE CALLED AS ROOT. As it exits this function as
1127 * root. */
1128 if (!non_root_mode() && (euid = geteuid()) != 0) {
1129 DEBUG(0,("make_connection: PANIC ERROR. Called as nonroot "
1130 "(%u)\n", (unsigned int)euid ));
1131 smb_panic("make_connection: PANIC ERROR. Called as nonroot\n");
1132 }
1133
1134 if (conn_num_open(sconn) > 2047) {
1135 *status = NT_STATUS_INSUFF_SERVER_RESOURCES;
1136 return NULL;
1137 }
1138
1139 if(lp_security() != SEC_SHARE) {
1140 vuser = get_valid_user_struct(sconn, vuid);
1141 if (!vuser) {
1142 DEBUG(1,("make_connection: refusing to connect with "
1143 "no session setup\n"));
1144 *status = NT_STATUS_ACCESS_DENIED;
1145 return NULL;
1146 }
1147 }
1148
1149 /* Logic to try and connect to the correct [homes] share, preferably
1150 without too many getpwnam() lookups. This is particulary nasty for
1151 winbind usernames, where the share name isn't the same as unix
1152 username.
1153
1154 The snum of the homes share is stored on the vuser at session setup
1155 time.
1156 */
1157
1158 if (strequal(service_in,HOMES_NAME)) {
1159 if(lp_security() != SEC_SHARE) {
1160 DATA_BLOB no_pw = data_blob_null;
1161 if (vuser->homes_snum == -1) {
1162 DEBUG(2, ("[homes] share not available for "
1163 "this user because it was not found "
1164 "or created at session setup "
1165 "time\n"));
1166 *status = NT_STATUS_BAD_NETWORK_NAME;
1167 return NULL;
1168 }
1169 DEBUG(5, ("making a connection to [homes] service "
1170 "created at session setup time\n"));
1171 return make_connection_snum(sconn,
1172 vuser->homes_snum,
1173 vuser, no_pw,
1174 dev, status);
1175 } else {
1176 /* Security = share. Try with
1177 * current_user_info.smb_name as the username. */
1178 if (*current_user_info.smb_name) {
1179 char *unix_username = NULL;
1180 (void)map_username(talloc_tos(),
1181 current_user_info.smb_name,
1182 &unix_username);
1183 snum = find_service(talloc_tos(),
1184 unix_username,
1185 &unix_username);
1186 if (!unix_username) {
1187 *status = NT_STATUS_NO_MEMORY;
1188 }
1189 return NULL;
1190 }
1191 if (snum != -1) {
1192 DEBUG(5, ("making a connection to 'homes' "
1193 "service %s based on "
1194 "security=share\n", service_in));
1195 return make_connection_snum(sconn,
1196 snum, NULL,
1197 password,
1198 dev, status);
1199 }
1200 }
1201 } else if ((lp_security() != SEC_SHARE) && (vuser->homes_snum != -1)
1202 && strequal(service_in,
1203 lp_servicename(vuser->homes_snum))) {
1204 DATA_BLOB no_pw = data_blob_null;
1205 DEBUG(5, ("making a connection to 'homes' service [%s] "
1206 "created at session setup time\n", service_in));
1207 return make_connection_snum(sconn,
1208 vuser->homes_snum,
1209 vuser, no_pw,
1210 dev, status);
1211 }
1212
1213 service = talloc_strdup(talloc_tos(), service_in);
1214 if (!service) {
1215 *status = NT_STATUS_NO_MEMORY;
1216 return NULL;
1217 }
1218
1219 strlower_m(service);
1220
1221 snum = find_service(talloc_tos(), service, &service);
1222 if (!service) {
1223 *status = NT_STATUS_NO_MEMORY;
1224 return NULL;
1225 }
1226
1227 if (snum < 0) {
1228 if (strequal(service,"IPC$") ||
1229 (lp_enable_asu_support() && strequal(service,"ADMIN$"))) {
1230 DEBUG(3,("refusing IPC connection to %s\n", service));
1231 *status = NT_STATUS_ACCESS_DENIED;
1232 return NULL;
1233 }
1234
1235 DEBUG(3,("%s (%s) couldn't find service %s\n",
1236 get_remote_machine_name(),
1237 tsocket_address_string(
1238 sconn->remote_address, talloc_tos()),
1239 service));
1240 *status = NT_STATUS_BAD_NETWORK_NAME;
1241 return NULL;
1242 }
1243
1244 /* Handle non-Dfs clients attempting connections to msdfs proxy */
1245 if (lp_host_msdfs() && (*lp_msdfs_proxy(snum) != '\0')) {
1246 DEBUG(3, ("refusing connection to dfs proxy share '%s' "
1247 "(pointing to %s)\n",
1248 service, lp_msdfs_proxy(snum)));
1249 *status = NT_STATUS_BAD_NETWORK_NAME;
1250 return NULL;
1251 }
1252
1253 DEBUG(5, ("making a connection to 'normal' service %s\n", service));
1254
1255 return make_connection_snum(sconn, snum, vuser,
1256 password,
1257 dev, status);
1258 }
1259
1260 /****************************************************************************
1261 Close a cnum.
1262 ****************************************************************************/
1263
1264 void close_cnum(connection_struct *conn, uint16 vuid)
1265 {
1266 file_close_conn(conn);
1267
1268 if (!IS_IPC(conn)) {
1269 dptr_closecnum(conn);
1270 }
1271
1272 change_to_root_user();
1273
1274 DEBUG(IS_IPC(conn)?3:1, ("%s (%s) closed connection to service %s\n",
1275 get_remote_machine_name(),
1276 conn->sconn->client_id.addr,
1277 lp_servicename(SNUM(conn))));
1278
1279 /* Call VFS disconnect hook */
1280 SMB_VFS_DISCONNECT(conn);
1281
1282 yield_connection(conn, lp_servicename(SNUM(conn)));
1283
1284 /* make sure we leave the directory available for unmount */
1285 vfs_ChDir(conn, "/");
1286
1287 /* execute any "postexec = " line */
1288 if (*lp_postexec(SNUM(conn)) &&
1289 change_to_user(conn, vuid)) {
1290 char *cmd = talloc_sub_advanced(talloc_tos(),
1291 lp_servicename(SNUM(conn)),
1292 conn->session_info->unix_name,
1293 conn->connectpath,
1294 conn->session_info->utok.gid,
1295 conn->session_info->sanitized_username,
1296 conn->session_info->info3->base.domain.string,
1297 lp_postexec(SNUM(conn)));
1298 smbrun(cmd,NULL);
1299 TALLOC_FREE(cmd);
1300 change_to_root_user();
1301 }
1302
1303 change_to_root_user();
1304 /* execute any "root postexec = " line */
1305 if (*lp_rootpostexec(SNUM(conn))) {
1306 char *cmd = talloc_sub_advanced(talloc_tos(),
1307 lp_servicename(SNUM(conn)),
1308 conn->session_info->unix_name,
1309 conn->connectpath,
1310 conn->session_info->utok.gid,
1311 conn->session_info->sanitized_username,
1312 conn->session_info->info3->base.domain.string,
1313 lp_rootpostexec(SNUM(conn)));
1314 smbrun(cmd,NULL);
1315 TALLOC_FREE(cmd);
1316 }
1317
1318 conn_free(conn);
1319 }
WIP