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Remove smb_np_struct
[Samba/gebeck_regimport.git] / source3 / smbd / service.c
blob05197021a3242d1186e1a4e7f70f630c28261025
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 pdb_get_domain(vuid_serverinfo->sam_account),
650 vuid_serverinfo->ptok, snum)) {
651 DEBUG(2, ("user '%s' (from session setup) not "
652 "permitted to access this share "
653 "(%s)\n",
654 vuid_serverinfo->unix_name,
655 lp_servicename(snum)));
656 return NT_STATUS_ACCESS_DENIED;
657 }
658 }
659
660 result = copy_serverinfo(mem_ctx, vuid_serverinfo);
661 if (result == NULL) {
662 return NT_STATUS_NO_MEMORY;
663 }
664
665 *presult = result;
666 return NT_STATUS_OK;
667 }
668
669 if (lp_security() == SEC_SHARE) {
670
671 fstring user;
672 bool guest;
673
674 /* add the sharename as a possible user name if we
675 are in share mode security */
676
677 add_session_user(lp_servicename(snum));
678
679 /* shall we let them in? */
680
681 if (!authorise_login(snum,user,password,&guest)) {
682 DEBUG( 2, ( "Invalid username/password for [%s]\n",
683 lp_servicename(snum)) );
684 return NT_STATUS_WRONG_PASSWORD;
685 }
686
687 return make_serverinfo_from_username(mem_ctx, user, guest,
688 presult);
689 }
690
691 DEBUG(0, ("invalid VUID (vuser) but not in security=share\n"));
692 return NT_STATUS_ACCESS_DENIED;
693 }
694
695
696 /****************************************************************************
697 Make a connection, given the snum to connect to, and the vuser of the
698 connecting user if appropriate.
699 ****************************************************************************/
700
701 static connection_struct *make_connection_snum(int snum, user_struct *vuser,
702 DATA_BLOB password,
703 const char *pdev,
704 NTSTATUS *pstatus)
705 {
706 connection_struct *conn;
707 SMB_STRUCT_STAT st;
708 fstring dev;
709 int ret;
710 char addr[INET6_ADDRSTRLEN];
711 bool on_err_call_dis_hook = false;
712 NTSTATUS status;
713
714 fstrcpy(dev, pdev);
715 SET_STAT_INVALID(st);
716
717 if (NT_STATUS_IS_ERR(*pstatus = share_sanity_checks(snum, dev))) {
718 return NULL;
719 }
720
721 conn = conn_new();
722 if (!conn) {
723 DEBUG(0,("Couldn't find free connection.\n"));
724 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
725 return NULL;
726 }
727
728 conn->params->service = snum;
729
730 status = create_connection_server_info(
731 conn, snum, vuser ? vuser->server_info : NULL, password,
732 &conn->server_info);
733
734 if (!NT_STATUS_IS_OK(status)) {
735 DEBUG(0, ("create_connection_server_info failed: %s\n",
736 nt_errstr(status)));
737 *pstatus = status;
738 conn_free(conn);
739 return NULL;
740 }
741
742 if ((lp_guest_only(snum)) || (lp_security() == SEC_SHARE)) {
743 conn->force_user = true;
744 }
745
746 add_session_user(conn->server_info->unix_name);
747
748 safe_strcpy(conn->client_address,
749 client_addr(get_client_fd(),addr,sizeof(addr)),
750 sizeof(conn->client_address)-1);
751 conn->num_files_open = 0;
752 conn->lastused = conn->lastused_count = time(NULL);
753 conn->used = True;
754 conn->printer = (strncmp(dev,"LPT",3) == 0);
755 conn->ipc = ( (strncmp(dev,"IPC",3) == 0) ||
756 ( lp_enable_asu_support() && strequal(dev,"ADMIN$")) );
757 conn->dirptr = NULL;
758
759 /* Case options for the share. */
760 if (lp_casesensitive(snum) == Auto) {
761 /* We will be setting this per packet. Set to be case
762 * insensitive for now. */
763 conn->case_sensitive = False;
764 } else {
765 conn->case_sensitive = (bool)lp_casesensitive(snum);
766 }
767
768 conn->case_preserve = lp_preservecase(snum);
769 conn->short_case_preserve = lp_shortpreservecase(snum);
770
771 conn->encrypt_level = lp_smb_encrypt(snum);
772
773 conn->veto_list = NULL;
774 conn->hide_list = NULL;
775 conn->veto_oplock_list = NULL;
776 conn->aio_write_behind_list = NULL;
777 string_set(&conn->dirpath,"");
778
779 conn->read_only = lp_readonly(SNUM(conn));
780 conn->admin_user = False;
781
782 if (*lp_force_user(snum)) {
783
784 /*
785 * Replace conn->server_info with a completely faked up one
786 * from the username we are forced into :-)
787 */
788
789 char *fuser;
790 struct auth_serversupplied_info *forced_serverinfo;
791
792 fuser = talloc_string_sub(conn, lp_force_user(snum), "%S",
793 lp_servicename(snum));
794 if (fuser == NULL) {
795 conn_free(conn);
796 *pstatus = NT_STATUS_NO_MEMORY;
797 return NULL;
798 }
799
800 status = make_serverinfo_from_username(
801 conn, fuser, conn->server_info->guest,
802 &forced_serverinfo);
803 if (!NT_STATUS_IS_OK(status)) {
804 conn_free(conn);
805 *pstatus = status;
806 return NULL;
807 }
808
809 TALLOC_FREE(conn->server_info);
810 conn->server_info = forced_serverinfo;
811
812 conn->force_user = True;
813 DEBUG(3,("Forced user %s\n", fuser));
814 }
815
816 /*
817 * If force group is true, then override
818 * any groupid stored for the connecting user.
819 */
820
821 if (*lp_force_group(snum)) {
822
823 status = find_forced_group(
824 conn->force_user, snum, conn->server_info->unix_name,
825 &conn->server_info->ptok->user_sids[1],
826 &conn->server_info->utok.gid);
827
828 if (!NT_STATUS_IS_OK(status)) {
829 conn_free(conn);
830 *pstatus = status;
831 return NULL;
832 }
833 }
834
835 conn->vuid = (vuser != NULL) ? vuser->vuid : UID_FIELD_INVALID;
836
837 {
838 char *s = talloc_sub_advanced(talloc_tos(),
839 lp_servicename(SNUM(conn)),
840 conn->server_info->unix_name,
841 conn->connectpath,
842 conn->server_info->utok.gid,
843 conn->server_info->sanitized_username,
844 pdb_get_domain(conn->server_info->sam_account),
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)),
962 conn->server_info->unix_name,
963 conn->connectpath,
964 conn->server_info->utok.gid,
965 conn->server_info->sanitized_username,
966 pdb_get_domain(conn->server_info->sam_account),
967 lp_rootpreexec(snum));
968 DEBUG(5,("cmd=%s\n",cmd));
969 ret = smbrun(cmd,NULL);
970 TALLOC_FREE(cmd);
971 if (ret != 0 && lp_rootpreexec_close(snum)) {
972 DEBUG(1,("root preexec gave %d - failing "
973 "connection\n", ret));
974 yield_connection(conn, lp_servicename(snum));
975 conn_free(conn);
976 *pstatus = NT_STATUS_ACCESS_DENIED;
977 return NULL;
978 }
979 }
980
981 /* USER Activites: */
982 if (!change_to_user(conn, conn->vuid)) {
983 /* No point continuing if they fail the basic checks */
984 DEBUG(0,("Can't become connected user!\n"));
985 yield_connection(conn, lp_servicename(snum));
986 conn_free(conn);
987 *pstatus = NT_STATUS_LOGON_FAILURE;
988 return NULL;
989 }
990
991 /* Remember that a different vuid can connect later without these
992 * checks... */
993
994 /* Preexecs are done here as they might make the dir we are to ChDir
995 * to below */
996
997 /* execute any "preexec = " line */
998 if (*lp_preexec(snum)) {
999 char *cmd = talloc_sub_advanced(talloc_tos(),
1000 lp_servicename(SNUM(conn)),
1001 conn->server_info->unix_name,
1002 conn->connectpath,
1003 conn->server_info->utok.gid,
1004 conn->server_info->sanitized_username,
1005 pdb_get_domain(conn->server_info->sam_account),
1006 lp_preexec(snum));
1007 ret = smbrun(cmd,NULL);
1008 TALLOC_FREE(cmd);
1009 if (ret != 0 && lp_preexec_close(snum)) {
1010 DEBUG(1,("preexec gave %d - failing connection\n",
1011 ret));
1012 *pstatus = NT_STATUS_ACCESS_DENIED;
1013 goto err_root_exit;
1014 }
1015 }
1016
1017 #ifdef WITH_FAKE_KASERVER
1018 if (lp_afs_share(snum)) {
1019 afs_login(conn);
1020 }
1021 #endif
1022
1023 /* Add veto/hide lists */
1024 if (!IS_IPC(conn) && !IS_PRINT(conn)) {
1025 set_namearray( &conn->veto_list, lp_veto_files(snum));
1026 set_namearray( &conn->hide_list, lp_hide_files(snum));
1027 set_namearray( &conn->veto_oplock_list, lp_veto_oplocks(snum));
1028 set_namearray( &conn->aio_write_behind_list,
1029 lp_aio_write_behind(snum));
1030 }
1031
1032 /* Invoke VFS make connection hook - do this before the VFS_STAT call
1033 to allow any filesystems needing user credentials to initialize
1034 themselves. */
1035
1036 if (SMB_VFS_CONNECT(conn, lp_servicename(snum),
1037 conn->server_info->unix_name) < 0) {
1038 DEBUG(0,("make_connection: VFS make connection failed!\n"));
1039 *pstatus = NT_STATUS_UNSUCCESSFUL;
1040 goto err_root_exit;
1041 }
1042
1043 /* Any error exit after here needs to call the disconnect hook. */
1044 on_err_call_dis_hook = true;
1045
1046 /* win2000 does not check the permissions on the directory
1047 during the tree connect, instead relying on permission
1048 check during individual operations. To match this behaviour
1049 I have disabled this chdir check (tridge) */
1050 /* the alternative is just to check the directory exists */
1051 if ((ret = SMB_VFS_STAT(conn, conn->connectpath, &st)) != 0 ||
1052 !S_ISDIR(st.st_mode)) {
1053 if (ret == 0 && !S_ISDIR(st.st_mode)) {
1054 DEBUG(0,("'%s' is not a directory, when connecting to "
1055 "[%s]\n", conn->connectpath,
1056 lp_servicename(snum)));
1057 } else {
1058 DEBUG(0,("'%s' does not exist or permission denied "
1059 "when connecting to [%s] Error was %s\n",
1060 conn->connectpath, lp_servicename(snum),
1061 strerror(errno) ));
1062 }
1063 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
1064 goto err_root_exit;
1065 }
1066
1067 string_set(&conn->origpath,conn->connectpath);
1068
1069 #if SOFTLINK_OPTIMISATION
1070 /* resolve any soft links early if possible */
1071 if (vfs_ChDir(conn,conn->connectpath) == 0) {
1072 TALLOC_CTX *ctx = talloc_tos();
1073 char *s = vfs_GetWd(ctx,s);
1074 if (!s) {
1075 *status = map_nt_error_from_unix(errno);
1076 goto err_root_exit;
1077 }
1078 if (!set_conn_connectpath(conn,s)) {
1079 *status = NT_STATUS_NO_MEMORY;
1080 goto err_root_exit;
1081 }
1082 vfs_ChDir(conn,conn->connectpath);
1083 }
1084 #endif
1085
1086 /* Figure out the characteristics of the underlying filesystem. This
1087 * assumes that all the filesystem mounted withing a share path have
1088 * the same characteristics, which is likely but not guaranteed.
1089 */
1090
1091 conn->fs_capabilities = SMB_VFS_FS_CAPABILITIES(conn);
1092
1093 /*
1094 * Print out the 'connected as' stuff here as we need
1095 * to know the effective uid and gid we will be using
1096 * (at least initially).
1097 */
1098
1099 if( DEBUGLVL( IS_IPC(conn) ? 3 : 1 ) ) {
1100 dbgtext( "%s (%s) ", get_remote_machine_name(),
1101 conn->client_address );
1102 dbgtext( "%s", srv_is_signing_active() ? "signed " : "");
1103 dbgtext( "connect to service %s ", lp_servicename(snum) );
1104 dbgtext( "initially as user %s ",
1105 conn->server_info->unix_name );
1106 dbgtext( "(uid=%d, gid=%d) ", (int)geteuid(), (int)getegid() );
1107 dbgtext( "(pid %d)\n", (int)sys_getpid() );
1108 }
1109
1110 /* we've finished with the user stuff - go back to root */
1111 change_to_root_user();
1112 return(conn);
1113
1114 err_root_exit:
1115
1116 change_to_root_user();
1117 if (on_err_call_dis_hook) {
1118 /* Call VFS disconnect hook */
1119 SMB_VFS_DISCONNECT(conn);
1120 }
1121 yield_connection(conn, lp_servicename(snum));
1122 conn_free(conn);
1123 return NULL;
1124 }
1125
1126 /***************************************************************************************
1127 Simple wrapper function for make_connection() to include a call to
1128 vfs_chdir()
1129 **************************************************************************************/
1130
1131 connection_struct *make_connection_with_chdir(const char *service_in,
1132 DATA_BLOB password,
1133 const char *dev, uint16 vuid,
1134 NTSTATUS *status)
1135 {
1136 connection_struct *conn = NULL;
1137
1138 conn = make_connection(service_in, password, dev, vuid, status);
1139
1140 /*
1141 * make_connection() does not change the directory for us any more
1142 * so we have to do it as a separate step --jerry
1143 */
1144
1145 if ( conn && vfs_ChDir(conn,conn->connectpath) != 0 ) {
1146 DEBUG(0,("make_connection_with_chdir: Can't change "
1147 "directory to %s for [print$] (%s)\n",
1148 conn->connectpath,strerror(errno)));
1149 yield_connection(conn, lp_servicename(SNUM(conn)));
1150 conn_free(conn);
1151 *status = NT_STATUS_UNSUCCESSFUL;
1152 return NULL;
1153 }
1154
1155 return conn;
1156 }
1157
1158 /****************************************************************************
1159 Make a connection to a service.
1160 *
1161 * @param service
1162 ****************************************************************************/
1163
1164 connection_struct *make_connection(const char *service_in, DATA_BLOB password,
1165 const char *pdev, uint16 vuid,
1166 NTSTATUS *status)
1167 {
1168 uid_t euid;
1169 user_struct *vuser = NULL;
1170 fstring service;
1171 fstring dev;
1172 int snum = -1;
1173 char addr[INET6_ADDRSTRLEN];
1174
1175 fstrcpy(dev, pdev);
1176
1177 /* This must ONLY BE CALLED AS ROOT. As it exits this function as
1178 * root. */
1179 if (!non_root_mode() && (euid = geteuid()) != 0) {
1180 DEBUG(0,("make_connection: PANIC ERROR. Called as nonroot "
1181 "(%u)\n", (unsigned int)euid ));
1182 smb_panic("make_connection: PANIC ERROR. Called as nonroot\n");
1183 }
1184
1185 if (conn_num_open() > 2047) {
1186 *status = NT_STATUS_INSUFF_SERVER_RESOURCES;
1187 return NULL;
1188 }
1189
1190 if(lp_security() != SEC_SHARE) {
1191 vuser = get_valid_user_struct(vuid);
1192 if (!vuser) {
1193 DEBUG(1,("make_connection: refusing to connect with "
1194 "no session setup\n"));
1195 *status = NT_STATUS_ACCESS_DENIED;
1196 return NULL;
1197 }
1198 }
1199
1200 /* Logic to try and connect to the correct [homes] share, preferably
1201 without too many getpwnam() lookups. This is particulary nasty for
1202 winbind usernames, where the share name isn't the same as unix
1203 username.
1204
1205 The snum of the homes share is stored on the vuser at session setup
1206 time.
1207 */
1208
1209 if (strequal(service_in,HOMES_NAME)) {
1210 if(lp_security() != SEC_SHARE) {
1211 DATA_BLOB no_pw = data_blob_null;
1212 if (vuser->homes_snum == -1) {
1213 DEBUG(2, ("[homes] share not available for "
1214 "this user because it was not found "
1215 "or created at session setup "
1216 "time\n"));
1217 *status = NT_STATUS_BAD_NETWORK_NAME;
1218 return NULL;
1219 }
1220 DEBUG(5, ("making a connection to [homes] service "
1221 "created at session setup time\n"));
1222 return make_connection_snum(vuser->homes_snum,
1223 vuser, no_pw,
1224 dev, status);
1225 } else {
1226 /* Security = share. Try with
1227 * current_user_info.smb_name as the username. */
1228 if (*current_user_info.smb_name) {
1229 fstring unix_username;
1230 fstrcpy(unix_username,
1231 current_user_info.smb_name);
1232 map_username(unix_username);
1233 snum = find_service(unix_username);
1234 }
1235 if (snum != -1) {
1236 DEBUG(5, ("making a connection to 'homes' "
1237 "service %s based on "
1238 "security=share\n", service_in));
1239 return make_connection_snum(snum, NULL,
1240 password,
1241 dev, status);
1242 }
1243 }
1244 } else if ((lp_security() != SEC_SHARE) && (vuser->homes_snum != -1)
1245 && strequal(service_in,
1246 lp_servicename(vuser->homes_snum))) {
1247 DATA_BLOB no_pw = data_blob_null;
1248 DEBUG(5, ("making a connection to 'homes' service [%s] "
1249 "created at session setup time\n", service_in));
1250 return make_connection_snum(vuser->homes_snum,
1251 vuser, no_pw,
1252 dev, status);
1253 }
1254
1255 fstrcpy(service, service_in);
1256
1257 strlower_m(service);
1258
1259 snum = find_service(service);
1260
1261 if (snum < 0) {
1262 if (strequal(service,"IPC$") ||
1263 (lp_enable_asu_support() && strequal(service,"ADMIN$"))) {
1264 DEBUG(3,("refusing IPC connection to %s\n", service));
1265 *status = NT_STATUS_ACCESS_DENIED;
1266 return NULL;
1267 }
1268
1269 DEBUG(0,("%s (%s) couldn't find service %s\n",
1270 get_remote_machine_name(),
1271 client_addr(get_client_fd(),addr,sizeof(addr)),
1272 service));
1273 *status = NT_STATUS_BAD_NETWORK_NAME;
1274 return NULL;
1275 }
1276
1277 /* Handle non-Dfs clients attempting connections to msdfs proxy */
1278 if (lp_host_msdfs() && (*lp_msdfs_proxy(snum) != '\0')) {
1279 DEBUG(3, ("refusing connection to dfs proxy share '%s' "
1280 "(pointing to %s)\n",
1281 service, lp_msdfs_proxy(snum)));
1282 *status = NT_STATUS_BAD_NETWORK_NAME;
1283 return NULL;
1284 }
1285
1286 DEBUG(5, ("making a connection to 'normal' service %s\n", service));
1287
1288 return make_connection_snum(snum, vuser,
1289 password,
1290 dev, status);
1291 }
1292
1293 /****************************************************************************
1294 Close a cnum.
1295 ****************************************************************************/
1296
1297 void close_cnum(connection_struct *conn, uint16 vuid)
1298 {
1299 file_close_conn(conn);
1300
1301 if (!IS_IPC(conn)) {
1302 dptr_closecnum(conn);
1303 }
1304
1305 change_to_root_user();
1306
1307 DEBUG(IS_IPC(conn)?3:1, ("%s (%s) closed connection to service %s\n",
1308 get_remote_machine_name(),
1309 conn->client_address,
1310 lp_servicename(SNUM(conn))));
1311
1312 /* Call VFS disconnect hook */
1313 SMB_VFS_DISCONNECT(conn);
1314
1315 yield_connection(conn, lp_servicename(SNUM(conn)));
1316
1317 /* make sure we leave the directory available for unmount */
1318 vfs_ChDir(conn, "/");
1319
1320 /* execute any "postexec = " line */
1321 if (*lp_postexec(SNUM(conn)) &&
1322 change_to_user(conn, vuid)) {
1323 char *cmd = talloc_sub_advanced(talloc_tos(),
1324 lp_servicename(SNUM(conn)),
1325 conn->server_info->unix_name,
1326 conn->connectpath,
1327 conn->server_info->utok.gid,
1328 conn->server_info->sanitized_username,
1329 pdb_get_domain(conn->server_info->sam_account),
1330 lp_postexec(SNUM(conn)));
1331 smbrun(cmd,NULL);
1332 TALLOC_FREE(cmd);
1333 change_to_root_user();
1334 }
1335
1336 change_to_root_user();
1337 /* execute any "root postexec = " line */
1338 if (*lp_rootpostexec(SNUM(conn))) {
1339 char *cmd = talloc_sub_advanced(talloc_tos(),
1340 lp_servicename(SNUM(conn)),
1341 conn->server_info->unix_name,
1342 conn->connectpath,
1343 conn->server_info->utok.gid,
1344 conn->server_info->sanitized_username,
1345 pdb_get_domain(conn->server_info->sam_account),
1346 lp_rootpostexec(SNUM(conn)));
1347 smbrun(cmd,NULL);
1348 TALLOC_FREE(cmd);
1349 }
1350
1351 conn_free(conn);
1352 }
reg import