?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Remove the unix token info from connection_struct
[Samba/gebeck_regimport.git] / source3 / smbd / service.c
blobfd072135e8c31e9f00b97984c8abb404b8b25ed1
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
22 extern userdom_struct current_user_info;
23
24 static bool canonicalize_connect_path(connection_struct *conn)
25 {
26 #ifdef REALPATH_TAKES_NULL
27 bool ret;
28 char *resolved_name = SMB_VFS_REALPATH(conn,conn->connectpath,NULL);
29 if (!resolved_name) {
30 return false;
31 }
32 ret = set_conn_connectpath(conn,resolved_name);
33 SAFE_FREE(resolved_name);
34 return ret;
35 #else
36 char resolved_name_buf[PATH_MAX+1];
37 char *resolved_name = SMB_VFS_REALPATH(conn,conn->connectpath,resolved_name_buf);
38 if (!resolved_name) {
39 return false;
40 }
41 return set_conn_connectpath(conn,resolved_name);
42 #endif /* REALPATH_TAKES_NULL */
43 }
44
45 /****************************************************************************
46 Ensure when setting connectpath it is a canonicalized (no ./ // or ../)
47 absolute path stating in / and not ending in /.
48 Observent people will notice a similarity between this and check_path_syntax :-).
49 ****************************************************************************/
50
51 bool set_conn_connectpath(connection_struct *conn, const char *connectpath)
52 {
53 char *destname;
54 char *d;
55 const char *s = connectpath;
56 bool start_of_name_component = true;
57
58 destname = SMB_STRDUP(connectpath);
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 static connection_struct *last_conn;
171 static uint16 last_flags;
172 int snum;
173
174 if (!conn) {
175 last_conn = NULL;
176 return(False);
177 }
178
179 conn->lastused_count++;
180
181 snum = SNUM(conn);
182
183 if (do_chdir &&
184 vfs_ChDir(conn,conn->connectpath) != 0 &&
185 vfs_ChDir(conn,conn->origpath) != 0) {
186 DEBUG(0,("chdir (%s) failed\n",
187 conn->connectpath));
188 return(False);
189 }
190
191 if ((conn == last_conn) && (last_flags == flags)) {
192 return(True);
193 }
194
195 last_conn = conn;
196 last_flags = flags;
197
198 /* Obey the client case sensitivity requests - only for clients that support it. */
199 switch (lp_casesensitive(snum)) {
200 case Auto:
201 {
202 /* We need this uglyness due to DOS/Win9x clients that lie about case insensitivity. */
203 enum remote_arch_types ra_type = get_remote_arch();
204 if ((ra_type != RA_SAMBA) && (ra_type != RA_CIFSFS)) {
205 /* Client can't support per-packet case sensitive pathnames. */
206 conn->case_sensitive = False;
207 } else {
208 conn->case_sensitive = !(flags & FLAG_CASELESS_PATHNAMES);
209 }
210 }
211 break;
212 case True:
213 conn->case_sensitive = True;
214 break;
215 default:
216 conn->case_sensitive = False;
217 break;
218 }
219 return(True);
220 }
221
222 static int load_registry_service(const char *servicename)
223 {
224 struct registry_key *key;
225 char *path;
226 WERROR err;
227
228 uint32 i;
229 char *value_name;
230 struct registry_value *value;
231
232 int res = -1;
233
234 if (!lp_registry_shares()) {
235 return -1;
236 }
237
238 if (strequal(servicename, GLOBAL_NAME)) {
239 return -2;
240 }
241
242 if (asprintf(&path, "%s\\%s", KEY_SMBCONF, servicename) == -1) {
243 return -1;
244 }
245
246 err = reg_open_path(NULL, path, REG_KEY_READ, get_root_nt_token(),
247 &key);
248 SAFE_FREE(path);
249
250 if (!W_ERROR_IS_OK(err)) {
251 return -1;
252 }
253
254 res = lp_add_service(servicename, -1);
255 if (res == -1) {
256 goto error;
257 }
258
259 for (i=0;
260 W_ERROR_IS_OK(reg_enumvalue(key, key, i, &value_name, &value));
261 i++) {
262 switch (value->type) {
263 case REG_DWORD: {
264 char *tmp;
265 if (asprintf(&tmp, "%d", value->v.dword) == -1) {
266 continue;
267 }
268 lp_do_parameter(res, value_name, tmp);
269 SAFE_FREE(tmp);
270 break;
271 }
272 case REG_SZ: {
273 lp_do_parameter(res, value_name, value->v.sz.str);
274 break;
275 }
276 default:
277 /* Ignore all the rest */
278 break;
279 }
280
281 TALLOC_FREE(value_name);
282 TALLOC_FREE(value);
283 }
284
285 error:
286
287 TALLOC_FREE(key);
288 return res;
289 }
290
291 void load_registry_shares(void)
292 {
293 struct registry_key *key;
294 char *name;
295 WERROR err;
296 int i;
297
298 DEBUG(8, ("load_registry_shares()\n"));
299 if (!lp_registry_shares()) {
300 return;
301 }
302
303 err = reg_open_path(NULL, KEY_SMBCONF, REG_KEY_READ,
304 get_root_nt_token(), &key);
305 if (!(W_ERROR_IS_OK(err))) {
306 return;
307 }
308
309 for (i=0; W_ERROR_IS_OK(reg_enumkey(key, key, i, &name, NULL)); i++) {
310 load_registry_service(name);
311 TALLOC_FREE(name);
312 }
313
314 TALLOC_FREE(key);
315 return;
316 }
317
318 /****************************************************************************
319 Add a home service. Returns the new service number or -1 if fail.
320 ****************************************************************************/
321
322 int add_home_service(const char *service, const char *username, const char *homedir)
323 {
324 int iHomeService;
325
326 if (!service || !homedir)
327 return -1;
328
329 if ((iHomeService = lp_servicenumber(HOMES_NAME)) < 0) {
330 if ((iHomeService = load_registry_service(HOMES_NAME)) < 0) {
331 return -1;
332 }
333 }
334
335 /*
336 * If this is a winbindd provided username, remove
337 * the domain component before adding the service.
338 * Log a warning if the "path=" parameter does not
339 * include any macros.
340 */
341
342 {
343 const char *p = strchr(service,*lp_winbind_separator());
344
345 /* We only want the 'user' part of the string */
346 if (p) {
347 service = p + 1;
348 }
349 }
350
351 if (!lp_add_home(service, iHomeService, username, homedir)) {
352 return -1;
353 }
354
355 return lp_servicenumber(service);
356
357 }
358
359 /**
360 * Find a service entry.
361 *
362 * @param service is modified (to canonical form??)
363 **/
364
365 int find_service(fstring service)
366 {
367 int iService;
368
369 all_string_sub(service,"\\","/",0);
370
371 iService = lp_servicenumber(service);
372
373 /* now handle the special case of a home directory */
374 if (iService < 0) {
375 char *phome_dir = get_user_home_dir(talloc_tos(), service);
376
377 if(!phome_dir) {
378 /*
379 * Try mapping the servicename, it may
380 * be a Windows to unix mapped user name.
381 */
382 if(map_username(service))
383 phome_dir = get_user_home_dir(
384 talloc_tos(), service);
385 }
386
387 DEBUG(3,("checking for home directory %s gave %s\n",service,
388 phome_dir?phome_dir:"(NULL)"));
389
390 iService = add_home_service(service,service /* 'username' */, phome_dir);
391 }
392
393 /* If we still don't have a service, attempt to add it as a printer. */
394 if (iService < 0) {
395 int iPrinterService;
396
397 if ((iPrinterService = lp_servicenumber(PRINTERS_NAME)) < 0) {
398 iPrinterService = load_registry_service(PRINTERS_NAME);
399 }
400 if (iPrinterService) {
401 DEBUG(3,("checking whether %s is a valid printer name...\n", service));
402 if (pcap_printername_ok(service)) {
403 DEBUG(3,("%s is a valid printer name\n", service));
404 DEBUG(3,("adding %s as a printer service\n", service));
405 lp_add_printer(service, iPrinterService);
406 iService = lp_servicenumber(service);
407 if (iService < 0) {
408 DEBUG(0,("failed to add %s as a printer service!\n", service));
409 }
410 } else {
411 DEBUG(3,("%s is not a valid printer name\n", service));
412 }
413 }
414 }
415
416 /* Check for default vfs service? Unsure whether to implement this */
417 if (iService < 0) {
418 }
419
420 if (iService < 0) {
421 iService = load_registry_service(service);
422 }
423
424 /* Is it a usershare service ? */
425 if (iService < 0 && *lp_usershare_path()) {
426 /* Ensure the name is canonicalized. */
427 strlower_m(service);
428 iService = load_usershare_service(service);
429 }
430
431 /* just possibly it's a default service? */
432 if (iService < 0) {
433 char *pdefservice = lp_defaultservice();
434 if (pdefservice && *pdefservice && !strequal(pdefservice,service) && !strstr_m(service,"..")) {
435 /*
436 * We need to do a local copy here as lp_defaultservice()
437 * returns one of the rotating lp_string buffers that
438 * could get overwritten by the recursive find_service() call
439 * below. Fix from Josef Hinteregger <joehtg@joehtg.co.at>.
440 */
441 char *defservice = SMB_STRDUP(pdefservice);
442
443 if (!defservice) {
444 goto fail;
445 }
446
447 /* Disallow anything except explicit share names. */
448 if (strequal(defservice,HOMES_NAME) ||
449 strequal(defservice, PRINTERS_NAME) ||
450 strequal(defservice, "IPC$")) {
451 SAFE_FREE(defservice);
452 goto fail;
453 }
454
455 iService = find_service(defservice);
456 if (iService >= 0) {
457 all_string_sub(service, "_","/",0);
458 iService = lp_add_service(service, iService);
459 }
460 SAFE_FREE(defservice);
461 }
462 }
463
464 if (iService >= 0) {
465 if (!VALID_SNUM(iService)) {
466 DEBUG(0,("Invalid snum %d for %s\n",iService, service));
467 iService = -1;
468 }
469 }
470
471 fail:
472
473 if (iService < 0)
474 DEBUG(3,("find_service() failed to find service %s\n", service));
475
476 return (iService);
477 }
478
479
480 /****************************************************************************
481 do some basic sainity checks on the share.
482 This function modifies dev, ecode.
483 ****************************************************************************/
484
485 static NTSTATUS share_sanity_checks(int snum, fstring dev)
486 {
487
488 if (!lp_snum_ok(snum) ||
489 !check_access(smbd_server_fd(),
490 lp_hostsallow(snum), lp_hostsdeny(snum))) {
491 return NT_STATUS_ACCESS_DENIED;
492 }
493
494 if (dev[0] == '?' || !dev[0]) {
495 if (lp_print_ok(snum)) {
496 fstrcpy(dev,"LPT1:");
497 } else if (strequal(lp_fstype(snum), "IPC")) {
498 fstrcpy(dev, "IPC");
499 } else {
500 fstrcpy(dev,"A:");
501 }
502 }
503
504 strupper_m(dev);
505
506 if (lp_print_ok(snum)) {
507 if (!strequal(dev, "LPT1:")) {
508 return NT_STATUS_BAD_DEVICE_TYPE;
509 }
510 } else if (strequal(lp_fstype(snum), "IPC")) {
511 if (!strequal(dev, "IPC")) {
512 return NT_STATUS_BAD_DEVICE_TYPE;
513 }
514 } else if (!strequal(dev, "A:")) {
515 return NT_STATUS_BAD_DEVICE_TYPE;
516 }
517
518 /* Behave as a printer if we are supposed to */
519 if (lp_print_ok(snum) && (strcmp(dev, "A:") == 0)) {
520 fstrcpy(dev, "LPT1:");
521 }
522
523 return NT_STATUS_OK;
524 }
525
526 /*
527 * Go through lookup_name etc to find the force'd group.
528 *
529 * Create a new token from src_token, replacing the primary group sid with the
530 * one found.
531 */
532
533 static NTSTATUS find_forced_group(bool force_user,
534 int snum, const char *username,
535 DOM_SID *pgroup_sid,
536 gid_t *pgid)
537 {
538 NTSTATUS result = NT_STATUS_NO_SUCH_GROUP;
539 TALLOC_CTX *frame = talloc_stackframe();
540 DOM_SID group_sid;
541 enum lsa_SidType type;
542 char *groupname;
543 bool user_must_be_member = False;
544 gid_t gid;
545
546 groupname = talloc_strdup(talloc_tos(), lp_force_group(snum));
547 if (groupname == NULL) {
548 DEBUG(1, ("talloc_strdup failed\n"));
549 result = NT_STATUS_NO_MEMORY;
550 goto done;
551 }
552
553 if (groupname[0] == '+') {
554 user_must_be_member = True;
555 groupname += 1;
556 }
557
558 groupname = talloc_string_sub(talloc_tos(), groupname,
559 "%S", lp_servicename(snum));
560 if (groupname == NULL) {
561 DEBUG(1, ("talloc_string_sub failed\n"));
562 result = NT_STATUS_NO_MEMORY;
563 goto done;
564 }
565
566 if (!lookup_name_smbconf(talloc_tos(), groupname,
567 LOOKUP_NAME_ALL|LOOKUP_NAME_GROUP,
568 NULL, NULL, &group_sid, &type)) {
569 DEBUG(10, ("lookup_name_smbconf(%s) failed\n",
570 groupname));
571 goto done;
572 }
573
574 if ((type != SID_NAME_DOM_GRP) && (type != SID_NAME_ALIAS) &&
575 (type != SID_NAME_WKN_GRP)) {
576 DEBUG(10, ("%s is a %s, not a group\n", groupname,
577 sid_type_lookup(type)));
578 goto done;
579 }
580
581 if (!sid_to_gid(&group_sid, &gid)) {
582 DEBUG(10, ("sid_to_gid(%s) for %s failed\n",
583 sid_string_dbg(&group_sid), groupname));
584 goto done;
585 }
586
587 /*
588 * If the user has been forced and the forced group starts with a '+',
589 * then we only set the group to be the forced group if the forced
590 * user is a member of that group. Otherwise, the meaning of the '+'
591 * would be ignored.
592 */
593
594 if (force_user && user_must_be_member) {
595 if (user_in_group_sid(username, &group_sid)) {
596 sid_copy(pgroup_sid, &group_sid);
597 *pgid = gid;
598 DEBUG(3,("Forced group %s for member %s\n",
599 groupname, username));
600 } else {
601 DEBUG(0,("find_forced_group: forced user %s is not a member "
602 "of forced group %s. Disallowing access.\n",
603 username, groupname ));
604 result = NT_STATUS_MEMBER_NOT_IN_GROUP;
605 goto done;
606 }
607 } else {
608 sid_copy(pgroup_sid, &group_sid);
609 *pgid = gid;
610 DEBUG(3,("Forced group %s\n", groupname));
611 }
612
613 result = NT_STATUS_OK;
614 done:
615 TALLOC_FREE(frame);
616 return result;
617 }
618
619 /****************************************************************************
620 Create an auth_serversupplied_info structure for a connection_struct
621 ****************************************************************************/
622
623 static NTSTATUS create_connection_server_info(TALLOC_CTX *mem_ctx, int snum,
624 struct auth_serversupplied_info *vuid_serverinfo,
625 DATA_BLOB password,
626 struct auth_serversupplied_info **presult)
627 {
628 if (lp_guest_only(snum)) {
629 return make_server_info_guest(mem_ctx, presult);
630 }
631
632 if (vuid_serverinfo != NULL) {
633
634 struct auth_serversupplied_info *result;
635
636 /*
637 * This is the normal security != share case where we have a
638 * valid vuid from the session setup. */
639
640 if (vuid_serverinfo->guest) {
641 if (!lp_guest_ok(snum)) {
642 DEBUG(2, ("guest user (from session setup) "
643 "not permitted to access this share "
644 "(%s)\n", lp_servicename(snum)));
645 return NT_STATUS_ACCESS_DENIED;
646 }
647 } else {
648 if (!user_ok_token(vuid_serverinfo->unix_name,
649 vuid_serverinfo->ptok, snum)) {
650 DEBUG(2, ("user '%s' (from session setup) not "
651 "permitted to access this share "
652 "(%s)\n",
653 vuid_serverinfo->unix_name,
654 lp_servicename(snum)));
655 return NT_STATUS_ACCESS_DENIED;
656 }
657 }
658
659 result = copy_serverinfo(mem_ctx, vuid_serverinfo);
660 if (result == NULL) {
661 return NT_STATUS_NO_MEMORY;
662 }
663
664 *presult = result;
665 return NT_STATUS_OK;
666 }
667
668 if (lp_security() == SEC_SHARE) {
669
670 fstring user;
671 bool guest;
672
673 /* add the sharename as a possible user name if we
674 are in share mode security */
675
676 add_session_user(lp_servicename(snum));
677
678 /* shall we let them in? */
679
680 if (!authorise_login(snum,user,password,&guest)) {
681 DEBUG( 2, ( "Invalid username/password for [%s]\n",
682 lp_servicename(snum)) );
683 return NT_STATUS_WRONG_PASSWORD;
684 }
685
686 return make_serverinfo_from_username(mem_ctx, user, guest,
687 presult);
688 }
689
690 DEBUG(0, ("invalid VUID (vuser) but not in security=share\n"));
691 return NT_STATUS_ACCESS_DENIED;
692 }
693
694
695 /****************************************************************************
696 Make a connection, given the snum to connect to, and the vuser of the
697 connecting user if appropriate.
698 ****************************************************************************/
699
700 static connection_struct *make_connection_snum(int snum, user_struct *vuser,
701 DATA_BLOB password,
702 const char *pdev,
703 NTSTATUS *pstatus)
704 {
705 connection_struct *conn;
706 SMB_STRUCT_STAT st;
707 fstring dev;
708 int ret;
709 char addr[INET6_ADDRSTRLEN];
710 bool on_err_call_dis_hook = false;
711 NTSTATUS status;
712
713 fstrcpy(dev, pdev);
714 SET_STAT_INVALID(st);
715
716 if (NT_STATUS_IS_ERR(*pstatus = share_sanity_checks(snum, dev))) {
717 return NULL;
718 }
719
720 conn = conn_new();
721 if (!conn) {
722 DEBUG(0,("Couldn't find free connection.\n"));
723 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
724 return NULL;
725 }
726
727 conn->params->service = snum;
728
729 status = create_connection_server_info(
730 conn, snum, vuser ? vuser->server_info : NULL, password,
731 &conn->server_info);
732
733 if (!NT_STATUS_IS_OK(status)) {
734 DEBUG(0, ("create_connection_server_info failed: %s\n",
735 nt_errstr(status)));
736 *pstatus = status;
737 conn_free(conn);
738 return NULL;
739 }
740
741 if ((lp_guest_only(snum)) || (lp_security() == SEC_SHARE)) {
742 conn->force_user = true;
743 }
744
745 add_session_user(conn->server_info->unix_name);
746
747 safe_strcpy(conn->client_address,
748 client_addr(get_client_fd(),addr,sizeof(addr)),
749 sizeof(conn->client_address)-1);
750 conn->num_files_open = 0;
751 conn->lastused = conn->lastused_count = time(NULL);
752 conn->used = True;
753 conn->printer = (strncmp(dev,"LPT",3) == 0);
754 conn->ipc = ( (strncmp(dev,"IPC",3) == 0) ||
755 ( lp_enable_asu_support() && strequal(dev,"ADMIN$")) );
756 conn->dirptr = NULL;
757
758 /* Case options for the share. */
759 if (lp_casesensitive(snum) == Auto) {
760 /* We will be setting this per packet. Set to be case
761 * insensitive for now. */
762 conn->case_sensitive = False;
763 } else {
764 conn->case_sensitive = (bool)lp_casesensitive(snum);
765 }
766
767 conn->case_preserve = lp_preservecase(snum);
768 conn->short_case_preserve = lp_shortpreservecase(snum);
769
770 conn->encrypt_level = lp_smb_encrypt(snum);
771
772 conn->veto_list = NULL;
773 conn->hide_list = NULL;
774 conn->veto_oplock_list = NULL;
775 conn->aio_write_behind_list = NULL;
776 string_set(&conn->dirpath,"");
777
778 conn->read_only = lp_readonly(SNUM(conn));
779 conn->admin_user = False;
780
781 if (*lp_force_user(snum)) {
782
783 /*
784 * Replace conn->server_info with a completely faked up one
785 * from the username we are forced into :-)
786 */
787
788 char *fuser;
789 struct auth_serversupplied_info *forced_serverinfo;
790
791 fuser = talloc_string_sub(conn, lp_force_user(snum), "%S",
792 lp_servicename(snum));
793 if (fuser == NULL) {
794 conn_free(conn);
795 *pstatus = NT_STATUS_NO_MEMORY;
796 return NULL;
797 }
798
799 status = make_serverinfo_from_username(
800 conn, fuser, conn->server_info->guest,
801 &forced_serverinfo);
802 if (!NT_STATUS_IS_OK(status)) {
803 conn_free(conn);
804 *pstatus = status;
805 return NULL;
806 }
807
808 TALLOC_FREE(conn->server_info);
809 conn->server_info = forced_serverinfo;
810
811 conn->force_user = True;
812 DEBUG(3,("Forced user %s\n", fuser));
813 }
814
815 /*
816 * If force group is true, then override
817 * any groupid stored for the connecting user.
818 */
819
820 if (*lp_force_group(snum)) {
821
822 status = find_forced_group(
823 conn->force_user, snum, conn->user,
824 &conn->server_info->ptok->user_sids[1],
825 &conn->server_info->gid);
826
827 if (!NT_STATUS_IS_OK(status)) {
828 conn_free(conn);
829 *pstatus = status;
830 return NULL;
831 }
832 }
833
834 conn->vuid = (vuser != NULL) ? vuser->vuid : UID_FIELD_INVALID;
835
836 string_set(&conn->user, conn->server_info->unix_name);
837
838 {
839 char *s = talloc_sub_advanced(talloc_tos(),
840 lp_servicename(SNUM(conn)), conn->user,
841 conn->connectpath,
842 conn->server_info->gid,
843 get_current_username(),
844 current_user_info.domain,
845 lp_pathname(snum));
846 if (!s) {
847 conn_free(conn);
848 *pstatus = NT_STATUS_NO_MEMORY;
849 return NULL;
850 }
851
852 if (!set_conn_connectpath(conn,s)) {
853 TALLOC_FREE(s);
854 conn_free(conn);
855 *pstatus = NT_STATUS_NO_MEMORY;
856 return NULL;
857 }
858 DEBUG(3,("Connect path is '%s' for service [%s]\n",s,
859 lp_servicename(snum)));
860 TALLOC_FREE(s);
861 }
862
863 /*
864 * New code to check if there's a share security descripter
865 * added from NT server manager. This is done after the
866 * smb.conf checks are done as we need a uid and token. JRA.
867 *
868 */
869
870 {
871 bool can_write = False;
872
873 can_write = share_access_check(conn->server_info->ptok,
874 lp_servicename(snum),
875 FILE_WRITE_DATA);
876
877 if (!can_write) {
878 if (!share_access_check(conn->server_info->ptok,
879 lp_servicename(snum),
880 FILE_READ_DATA)) {
881 /* No access, read or write. */
882 DEBUG(0,("make_connection: connection to %s "
883 "denied due to security "
884 "descriptor.\n",
885 lp_servicename(snum)));
886 conn_free(conn);
887 *pstatus = NT_STATUS_ACCESS_DENIED;
888 return NULL;
889 } else {
890 conn->read_only = True;
891 }
892 }
893 }
894 /* Initialise VFS function pointers */
895
896 if (!smbd_vfs_init(conn)) {
897 DEBUG(0, ("vfs_init failed for service %s\n",
898 lp_servicename(snum)));
899 conn_free(conn);
900 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
901 return NULL;
902 }
903
904 /*
905 * If widelinks are disallowed we need to canonicalise the connect
906 * path here to ensure we don't have any symlinks in the
907 * connectpath. We will be checking all paths on this connection are
908 * below this directory. We must do this after the VFS init as we
909 * depend on the realpath() pointer in the vfs table. JRA.
910 */
911 if (!lp_widelinks(snum)) {
912 if (!canonicalize_connect_path(conn)) {
913 DEBUG(0, ("canonicalize_connect_path failed "
914 "for service %s, path %s\n",
915 lp_servicename(snum),
916 conn->connectpath));
917 conn_free(conn);
918 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
919 return NULL;
920 }
921 }
922
923 if ((!conn->printer) && (!conn->ipc)) {
924 conn->notify_ctx = notify_init(conn, server_id_self(),
925 smbd_messaging_context(),
926 smbd_event_context(),
927 conn);
928 }
929
930 /* ROOT Activities: */
931 /*
932 * Enforce the max connections parameter.
933 */
934
935 if ((lp_max_connections(snum) > 0)
936 && (count_current_connections(lp_servicename(SNUM(conn)), True) >=
937 lp_max_connections(snum))) {
938
939 DEBUG(1, ("Max connections (%d) exceeded for %s\n",
940 lp_max_connections(snum), lp_servicename(snum)));
941 conn_free(conn);
942 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
943 return NULL;
944 }
945
946 /*
947 * Get us an entry in the connections db
948 */
949 if (!claim_connection(conn, lp_servicename(snum), 0)) {
950 DEBUG(1, ("Could not store connections entry\n"));
951 conn_free(conn);
952 *pstatus = NT_STATUS_INTERNAL_DB_ERROR;
953 return NULL;
954 }
955
956 /* Preexecs are done here as they might make the dir we are to ChDir
957 * to below */
958 /* execute any "root preexec = " line */
959 if (*lp_rootpreexec(snum)) {
960 char *cmd = talloc_sub_advanced(talloc_tos(),
961 lp_servicename(SNUM(conn)), conn->user,
962 conn->connectpath,
963 conn->server_info->gid,
964 get_current_username(),
965 current_user_info.domain,
966 lp_rootpreexec(snum));
967 DEBUG(5,("cmd=%s\n",cmd));
968 ret = smbrun(cmd,NULL);
969 TALLOC_FREE(cmd);
970 if (ret != 0 && lp_rootpreexec_close(snum)) {
971 DEBUG(1,("root preexec gave %d - failing "
972 "connection\n", ret));
973 yield_connection(conn, lp_servicename(snum));
974 conn_free(conn);
975 *pstatus = NT_STATUS_ACCESS_DENIED;
976 return NULL;
977 }
978 }
979
980 /* USER Activites: */
981 if (!change_to_user(conn, conn->vuid)) {
982 /* No point continuing if they fail the basic checks */
983 DEBUG(0,("Can't become connected user!\n"));
984 yield_connection(conn, lp_servicename(snum));
985 conn_free(conn);
986 *pstatus = NT_STATUS_LOGON_FAILURE;
987 return NULL;
988 }
989
990 /* Remember that a different vuid can connect later without these
991 * checks... */
992
993 /* Preexecs are done here as they might make the dir we are to ChDir
994 * to below */
995
996 /* execute any "preexec = " line */
997 if (*lp_preexec(snum)) {
998 char *cmd = talloc_sub_advanced(talloc_tos(),
999 lp_servicename(SNUM(conn)), conn->user,
1000 conn->connectpath,
1001 conn->server_info->gid,
1002 get_current_username(),
1003 current_user_info.domain,
1004 lp_preexec(snum));
1005 ret = smbrun(cmd,NULL);
1006 TALLOC_FREE(cmd);
1007 if (ret != 0 && lp_preexec_close(snum)) {
1008 DEBUG(1,("preexec gave %d - failing connection\n",
1009 ret));
1010 *pstatus = NT_STATUS_ACCESS_DENIED;
1011 goto err_root_exit;
1012 }
1013 }
1014
1015 #ifdef WITH_FAKE_KASERVER
1016 if (lp_afs_share(snum)) {
1017 afs_login(conn);
1018 }
1019 #endif
1020
1021 /* Add veto/hide lists */
1022 if (!IS_IPC(conn) && !IS_PRINT(conn)) {
1023 set_namearray( &conn->veto_list, lp_veto_files(snum));
1024 set_namearray( &conn->hide_list, lp_hide_files(snum));
1025 set_namearray( &conn->veto_oplock_list, lp_veto_oplocks(snum));
1026 }
1027
1028 /* Invoke VFS make connection hook - do this before the VFS_STAT call
1029 to allow any filesystems needing user credentials to initialize
1030 themselves. */
1031
1032 if (SMB_VFS_CONNECT(conn, lp_servicename(snum), conn->user) < 0) {
1033 DEBUG(0,("make_connection: VFS make connection failed!\n"));
1034 *pstatus = NT_STATUS_UNSUCCESSFUL;
1035 goto err_root_exit;
1036 }
1037
1038 /* Any error exit after here needs to call the disconnect hook. */
1039 on_err_call_dis_hook = true;
1040
1041 /* win2000 does not check the permissions on the directory
1042 during the tree connect, instead relying on permission
1043 check during individual operations. To match this behaviour
1044 I have disabled this chdir check (tridge) */
1045 /* the alternative is just to check the directory exists */
1046 if ((ret = SMB_VFS_STAT(conn, conn->connectpath, &st)) != 0 ||
1047 !S_ISDIR(st.st_mode)) {
1048 if (ret == 0 && !S_ISDIR(st.st_mode)) {
1049 DEBUG(0,("'%s' is not a directory, when connecting to "
1050 "[%s]\n", conn->connectpath,
1051 lp_servicename(snum)));
1052 } else {
1053 DEBUG(0,("'%s' does not exist or permission denied "
1054 "when connecting to [%s] Error was %s\n",
1055 conn->connectpath, lp_servicename(snum),
1056 strerror(errno) ));
1057 }
1058 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
1059 goto err_root_exit;
1060 }
1061
1062 string_set(&conn->origpath,conn->connectpath);
1063
1064 #if SOFTLINK_OPTIMISATION
1065 /* resolve any soft links early if possible */
1066 if (vfs_ChDir(conn,conn->connectpath) == 0) {
1067 TALLOC_CTX *ctx = talloc_tos();
1068 char *s = vfs_GetWd(ctx,s);
1069 if (!s) {
1070 *status = map_nt_error_from_unix(errno);
1071 goto err_root_exit;
1072 }
1073 if (!set_conn_connectpath(conn,s)) {
1074 *status = NT_STATUS_NO_MEMORY;
1075 goto err_root_exit;
1076 }
1077 vfs_ChDir(conn,conn->connectpath);
1078 }
1079 #endif
1080
1081 /* Figure out the characteristics of the underlying filesystem. This
1082 * assumes that all the filesystem mounted withing a share path have
1083 * the same characteristics, which is likely but not guaranteed.
1084 */
1085
1086 conn->fs_capabilities = SMB_VFS_FS_CAPABILITIES(conn);
1087
1088 /*
1089 * Print out the 'connected as' stuff here as we need
1090 * to know the effective uid and gid we will be using
1091 * (at least initially).
1092 */
1093
1094 if( DEBUGLVL( IS_IPC(conn) ? 3 : 1 ) ) {
1095 dbgtext( "%s (%s) ", get_remote_machine_name(),
1096 conn->client_address );
1097 dbgtext( "%s", srv_is_signing_active() ? "signed " : "");
1098 dbgtext( "connect to service %s ", lp_servicename(snum) );
1099 dbgtext( "initially as user %s ", conn->user );
1100 dbgtext( "(uid=%d, gid=%d) ", (int)geteuid(), (int)getegid() );
1101 dbgtext( "(pid %d)\n", (int)sys_getpid() );
1102 }
1103
1104 /* we've finished with the user stuff - go back to root */
1105 change_to_root_user();
1106 return(conn);
1107
1108 err_root_exit:
1109
1110 change_to_root_user();
1111 if (on_err_call_dis_hook) {
1112 /* Call VFS disconnect hook */
1113 SMB_VFS_DISCONNECT(conn);
1114 }
1115 yield_connection(conn, lp_servicename(snum));
1116 conn_free(conn);
1117 return NULL;
1118 }
1119
1120 /***************************************************************************************
1121 Simple wrapper function for make_connection() to include a call to
1122 vfs_chdir()
1123 **************************************************************************************/
1124
1125 connection_struct *make_connection_with_chdir(const char *service_in,
1126 DATA_BLOB password,
1127 const char *dev, uint16 vuid,
1128 NTSTATUS *status)
1129 {
1130 connection_struct *conn = NULL;
1131
1132 conn = make_connection(service_in, password, dev, vuid, status);
1133
1134 /*
1135 * make_connection() does not change the directory for us any more
1136 * so we have to do it as a separate step --jerry
1137 */
1138
1139 if ( conn && vfs_ChDir(conn,conn->connectpath) != 0 ) {
1140 DEBUG(0,("move_driver_to_download_area: Can't change "
1141 "directory to %s for [print$] (%s)\n",
1142 conn->connectpath,strerror(errno)));
1143 yield_connection(conn, lp_servicename(SNUM(conn)));
1144 conn_free(conn);
1145 *status = NT_STATUS_UNSUCCESSFUL;
1146 return NULL;
1147 }
1148
1149 return conn;
1150 }
1151
1152 /****************************************************************************
1153 Make a connection to a service.
1154 *
1155 * @param service
1156 ****************************************************************************/
1157
1158 connection_struct *make_connection(const char *service_in, DATA_BLOB password,
1159 const char *pdev, uint16 vuid,
1160 NTSTATUS *status)
1161 {
1162 uid_t euid;
1163 user_struct *vuser = NULL;
1164 fstring service;
1165 fstring dev;
1166 int snum = -1;
1167 char addr[INET6_ADDRSTRLEN];
1168
1169 fstrcpy(dev, pdev);
1170
1171 /* This must ONLY BE CALLED AS ROOT. As it exits this function as
1172 * root. */
1173 if (!non_root_mode() && (euid = geteuid()) != 0) {
1174 DEBUG(0,("make_connection: PANIC ERROR. Called as nonroot "
1175 "(%u)\n", (unsigned int)euid ));
1176 smb_panic("make_connection: PANIC ERROR. Called as nonroot\n");
1177 }
1178
1179 if (conn_num_open() > 2047) {
1180 *status = NT_STATUS_INSUFF_SERVER_RESOURCES;
1181 return NULL;
1182 }
1183
1184 if(lp_security() != SEC_SHARE) {
1185 vuser = get_valid_user_struct(vuid);
1186 if (!vuser) {
1187 DEBUG(1,("make_connection: refusing to connect with "
1188 "no session setup\n"));
1189 *status = NT_STATUS_ACCESS_DENIED;
1190 return NULL;
1191 }
1192 }
1193
1194 /* Logic to try and connect to the correct [homes] share, preferably
1195 without too many getpwnam() lookups. This is particulary nasty for
1196 winbind usernames, where the share name isn't the same as unix
1197 username.
1198
1199 The snum of the homes share is stored on the vuser at session setup
1200 time.
1201 */
1202
1203 if (strequal(service_in,HOMES_NAME)) {
1204 if(lp_security() != SEC_SHARE) {
1205 DATA_BLOB no_pw = data_blob_null;
1206 if (vuser->homes_snum == -1) {
1207 DEBUG(2, ("[homes] share not available for "
1208 "this user because it was not found "
1209 "or created at session setup "
1210 "time\n"));
1211 *status = NT_STATUS_BAD_NETWORK_NAME;
1212 return NULL;
1213 }
1214 DEBUG(5, ("making a connection to [homes] service "
1215 "created at session setup time\n"));
1216 return make_connection_snum(vuser->homes_snum,
1217 vuser, no_pw,
1218 dev, status);
1219 } else {
1220 /* Security = share. Try with
1221 * current_user_info.smb_name as the username. */
1222 if (*current_user_info.smb_name) {
1223 fstring unix_username;
1224 fstrcpy(unix_username,
1225 current_user_info.smb_name);
1226 map_username(unix_username);
1227 snum = find_service(unix_username);
1228 }
1229 if (snum != -1) {
1230 DEBUG(5, ("making a connection to 'homes' "
1231 "service %s based on "
1232 "security=share\n", service_in));
1233 return make_connection_snum(snum, NULL,
1234 password,
1235 dev, status);
1236 }
1237 }
1238 } else if ((lp_security() != SEC_SHARE) && (vuser->homes_snum != -1)
1239 && strequal(service_in,
1240 lp_servicename(vuser->homes_snum))) {
1241 DATA_BLOB no_pw = data_blob_null;
1242 DEBUG(5, ("making a connection to 'homes' service [%s] "
1243 "created at session setup time\n", service_in));
1244 return make_connection_snum(vuser->homes_snum,
1245 vuser, no_pw,
1246 dev, status);
1247 }
1248
1249 fstrcpy(service, service_in);
1250
1251 strlower_m(service);
1252
1253 snum = find_service(service);
1254
1255 if (snum < 0) {
1256 if (strequal(service,"IPC$") ||
1257 (lp_enable_asu_support() && strequal(service,"ADMIN$"))) {
1258 DEBUG(3,("refusing IPC connection to %s\n", service));
1259 *status = NT_STATUS_ACCESS_DENIED;
1260 return NULL;
1261 }
1262
1263 DEBUG(0,("%s (%s) couldn't find service %s\n",
1264 get_remote_machine_name(),
1265 client_addr(get_client_fd(),addr,sizeof(addr)),
1266 service));
1267 *status = NT_STATUS_BAD_NETWORK_NAME;
1268 return NULL;
1269 }
1270
1271 /* Handle non-Dfs clients attempting connections to msdfs proxy */
1272 if (lp_host_msdfs() && (*lp_msdfs_proxy(snum) != '\0')) {
1273 DEBUG(3, ("refusing connection to dfs proxy share '%s' "
1274 "(pointing to %s)\n",
1275 service, lp_msdfs_proxy(snum)));
1276 *status = NT_STATUS_BAD_NETWORK_NAME;
1277 return NULL;
1278 }
1279
1280 DEBUG(5, ("making a connection to 'normal' service %s\n", service));
1281
1282 return make_connection_snum(snum, vuser,
1283 password,
1284 dev, status);
1285 }
1286
1287 /****************************************************************************
1288 Close a cnum.
1289 ****************************************************************************/
1290
1291 void close_cnum(connection_struct *conn, uint16 vuid)
1292 {
1293 if (IS_IPC(conn)) {
1294 pipe_close_conn(conn);
1295 } else {
1296 file_close_conn(conn);
1297 dptr_closecnum(conn);
1298 }
1299
1300 change_to_root_user();
1301
1302 DEBUG(IS_IPC(conn)?3:1, ("%s (%s) closed connection to service %s\n",
1303 get_remote_machine_name(),
1304 conn->client_address,
1305 lp_servicename(SNUM(conn))));
1306
1307 /* Call VFS disconnect hook */
1308 SMB_VFS_DISCONNECT(conn);
1309
1310 yield_connection(conn, lp_servicename(SNUM(conn)));
1311
1312 /* make sure we leave the directory available for unmount */
1313 vfs_ChDir(conn, "/");
1314
1315 /* execute any "postexec = " line */
1316 if (*lp_postexec(SNUM(conn)) &&
1317 change_to_user(conn, vuid)) {
1318 char *cmd = talloc_sub_advanced(talloc_tos(),
1319 lp_servicename(SNUM(conn)), conn->user,
1320 conn->connectpath,
1321 conn->server_info->gid,
1322 get_current_username(),
1323 current_user_info.domain,
1324 lp_postexec(SNUM(conn)));
1325 smbrun(cmd,NULL);
1326 TALLOC_FREE(cmd);
1327 change_to_root_user();
1328 }
1329
1330 change_to_root_user();
1331 /* execute any "root postexec = " line */
1332 if (*lp_rootpostexec(SNUM(conn))) {
1333 char *cmd = talloc_sub_advanced(talloc_tos(),
1334 lp_servicename(SNUM(conn)), conn->user,
1335 conn->connectpath,
1336 conn->server_info->gid,
1337 get_current_username(),
1338 current_user_info.domain,
1339 lp_rootpostexec(SNUM(conn)));
1340 smbrun(cmd,NULL);
1341 TALLOC_FREE(cmd);
1342 }
1343
1344 conn_free(conn);
1345 }
reg import