?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Fix a memleak in secrets_fetch_trust_account_password_legacy
[Samba.git] / source / smbd / service.c
blob491a67a2ebc086232792d6c39206145dab650407
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 static NTSTATUS find_forced_user(connection_struct *conn, bool vuser_is_guest, fstring username)
527 {
528 int snum = conn->params->service;
529 char *fuser, *found_username;
530 NTSTATUS result;
531
532 if (!(fuser = talloc_string_sub(conn->mem_ctx, lp_force_user(snum), "%S",
533 lp_servicename(snum)))) {
534 return NT_STATUS_NO_MEMORY;
535 }
536
537 result = create_token_from_username(conn->mem_ctx, fuser, vuser_is_guest,
538 &conn->uid, &conn->gid, &found_username,
539 &conn->nt_user_token);
540 if (!NT_STATUS_IS_OK(result)) {
541 return result;
542 }
543
544 fstrcpy(username, found_username);
545
546 TALLOC_FREE(fuser);
547 TALLOC_FREE(found_username);
548 return NT_STATUS_OK;
549 }
550
551 /*
552 * Go through lookup_name etc to find the force'd group.
553 *
554 * Create a new token from src_token, replacing the primary group sid with the
555 * one found.
556 */
557
558 static NTSTATUS find_forced_group(bool force_user,
559 int snum, const char *username,
560 DOM_SID *pgroup_sid,
561 gid_t *pgid)
562 {
563 NTSTATUS result = NT_STATUS_NO_SUCH_GROUP;
564 TALLOC_CTX *mem_ctx;
565 DOM_SID group_sid;
566 enum lsa_SidType type;
567 char *groupname;
568 bool user_must_be_member = False;
569 gid_t gid;
570
571 ZERO_STRUCTP(pgroup_sid);
572 *pgid = (gid_t)-1;
573
574 mem_ctx = talloc_new(NULL);
575 if (mem_ctx == NULL) {
576 DEBUG(0, ("talloc_new failed\n"));
577 return NT_STATUS_NO_MEMORY;
578 }
579
580 groupname = talloc_strdup(mem_ctx, lp_force_group(snum));
581 if (groupname == NULL) {
582 DEBUG(1, ("talloc_strdup failed\n"));
583 result = NT_STATUS_NO_MEMORY;
584 goto done;
585 }
586
587 if (groupname[0] == '+') {
588 user_must_be_member = True;
589 groupname += 1;
590 }
591
592 groupname = talloc_string_sub(mem_ctx, groupname,
593 "%S", lp_servicename(snum));
594
595 if (!lookup_name_smbconf(mem_ctx, groupname,
596 LOOKUP_NAME_ALL|LOOKUP_NAME_GROUP,
597 NULL, NULL, &group_sid, &type)) {
598 DEBUG(10, ("lookup_name_smbconf(%s) failed\n",
599 groupname));
600 goto done;
601 }
602
603 if ((type != SID_NAME_DOM_GRP) && (type != SID_NAME_ALIAS) &&
604 (type != SID_NAME_WKN_GRP)) {
605 DEBUG(10, ("%s is a %s, not a group\n", groupname,
606 sid_type_lookup(type)));
607 goto done;
608 }
609
610 if (!sid_to_gid(&group_sid, &gid)) {
611 DEBUG(10, ("sid_to_gid(%s) for %s failed\n",
612 sid_string_dbg(&group_sid), groupname));
613 goto done;
614 }
615
616 /*
617 * If the user has been forced and the forced group starts with a '+',
618 * then we only set the group to be the forced group if the forced
619 * user is a member of that group. Otherwise, the meaning of the '+'
620 * would be ignored.
621 */
622
623 if (force_user && user_must_be_member) {
624 if (user_in_group_sid(username, &group_sid)) {
625 sid_copy(pgroup_sid, &group_sid);
626 *pgid = gid;
627 DEBUG(3,("Forced group %s for member %s\n",
628 groupname, username));
629 } else {
630 DEBUG(0,("find_forced_group: forced user %s is not a member "
631 "of forced group %s. Disallowing access.\n",
632 username, groupname ));
633 result = NT_STATUS_MEMBER_NOT_IN_GROUP;
634 goto done;
635 }
636 } else {
637 sid_copy(pgroup_sid, &group_sid);
638 *pgid = gid;
639 DEBUG(3,("Forced group %s\n", groupname));
640 }
641
642 result = NT_STATUS_OK;
643 done:
644 TALLOC_FREE(mem_ctx);
645 return result;
646 }
647
648 /****************************************************************************
649 Make a connection, given the snum to connect to, and the vuser of the
650 connecting user if appropriate.
651 ****************************************************************************/
652
653 static connection_struct *make_connection_snum(int snum, user_struct *vuser,
654 DATA_BLOB password,
655 const char *pdev,
656 NTSTATUS *status)
657 {
658 struct passwd *pass = NULL;
659 bool guest = False;
660 connection_struct *conn;
661 SMB_STRUCT_STAT st;
662 fstring user;
663 fstring dev;
664 int ret;
665 char addr[INET6_ADDRSTRLEN];
666 bool on_err_call_dis_hook = false;
667
668 *user = 0;
669 fstrcpy(dev, pdev);
670 SET_STAT_INVALID(st);
671
672 if (NT_STATUS_IS_ERR(*status = share_sanity_checks(snum, dev))) {
673 return NULL;
674 }
675
676 conn = conn_new();
677 if (!conn) {
678 DEBUG(0,("Couldn't find free connection.\n"));
679 *status = NT_STATUS_INSUFFICIENT_RESOURCES;
680 return NULL;
681 }
682
683 conn->params->service = snum;
684 conn->nt_user_token = NULL;
685
686 if (lp_guest_only(snum)) {
687 const char *guestname = lp_guestaccount();
688 NTSTATUS status2;
689 char *found_username = NULL;
690
691 guest = True;
692 pass = getpwnam_alloc(NULL, guestname);
693 if (!pass) {
694 DEBUG(0,("make_connection_snum: Invalid guest "
695 "account %s??\n",guestname));
696 conn_free(conn);
697 *status = NT_STATUS_NO_SUCH_USER;
698 return NULL;
699 }
700 status2 = create_token_from_username(conn->mem_ctx, pass->pw_name, True,
701 &conn->uid, &conn->gid,
702 &found_username,
703 &conn->nt_user_token);
704 if (!NT_STATUS_IS_OK(status2)) {
705 TALLOC_FREE(pass);
706 conn_free(conn);
707 *status = status2;
708 return NULL;
709 }
710 fstrcpy(user, found_username);
711 string_set(&conn->user,user);
712 conn->force_user = True;
713 TALLOC_FREE(found_username);
714 TALLOC_FREE(pass);
715 DEBUG(3,("Guest only user %s\n",user));
716 } else if (vuser) {
717 if (vuser->guest) {
718 if (!lp_guest_ok(snum)) {
719 DEBUG(2, ("guest user (from session setup) "
720 "not permitted to access this share "
721 "(%s)\n", lp_servicename(snum)));
722 conn_free(conn);
723 *status = NT_STATUS_ACCESS_DENIED;
724 return NULL;
725 }
726 } else {
727 if (!user_ok_token(vuser->user.unix_name,
728 vuser->nt_user_token, snum)) {
729 DEBUG(2, ("user '%s' (from session setup) not "
730 "permitted to access this share "
731 "(%s)\n", vuser->user.unix_name,
732 lp_servicename(snum)));
733 conn_free(conn);
734 *status = NT_STATUS_ACCESS_DENIED;
735 return NULL;
736 }
737 }
738 conn->vuid = vuser->vuid;
739 conn->uid = vuser->uid;
740 conn->gid = vuser->gid;
741 string_set(&conn->user,vuser->user.unix_name);
742 fstrcpy(user,vuser->user.unix_name);
743 guest = vuser->guest;
744 } else if (lp_security() == SEC_SHARE) {
745 NTSTATUS status2;
746 char *found_username = NULL;
747
748 /* add it as a possible user name if we
749 are in share mode security */
750 add_session_user(lp_servicename(snum));
751 /* shall we let them in? */
752 if (!authorise_login(snum,user,password,&guest)) {
753 DEBUG( 2, ( "Invalid username/password for [%s]\n",
754 lp_servicename(snum)) );
755 conn_free(conn);
756 *status = NT_STATUS_WRONG_PASSWORD;
757 return NULL;
758 }
759 pass = Get_Pwnam_alloc(talloc_tos(), user);
760 status2 = create_token_from_username(conn->mem_ctx, pass->pw_name, True,
761 &conn->uid, &conn->gid,
762 &found_username,
763 &conn->nt_user_token);
764 TALLOC_FREE(pass);
765 if (!NT_STATUS_IS_OK(status2)) {
766 conn_free(conn);
767 *status = status2;
768 return NULL;
769 }
770 fstrcpy(user, found_username);
771 string_set(&conn->user,user);
772 TALLOC_FREE(found_username);
773 conn->force_user = True;
774 } else {
775 DEBUG(0, ("invalid VUID (vuser) but not in security=share\n"));
776 conn_free(conn);
777 *status = NT_STATUS_ACCESS_DENIED;
778 return NULL;
779 }
780
781 add_session_user(user);
782
783 safe_strcpy(conn->client_address,
784 client_addr(get_client_fd(),addr,sizeof(addr)),
785 sizeof(conn->client_address)-1);
786 conn->num_files_open = 0;
787 conn->lastused = conn->lastused_count = time(NULL);
788 conn->used = True;
789 conn->printer = (strncmp(dev,"LPT",3) == 0);
790 conn->ipc = ( (strncmp(dev,"IPC",3) == 0) ||
791 ( lp_enable_asu_support() && strequal(dev,"ADMIN$")) );
792 conn->dirptr = NULL;
793
794 /* Case options for the share. */
795 if (lp_casesensitive(snum) == Auto) {
796 /* We will be setting this per packet. Set to be case
797 * insensitive for now. */
798 conn->case_sensitive = False;
799 } else {
800 conn->case_sensitive = (bool)lp_casesensitive(snum);
801 }
802
803 conn->case_preserve = lp_preservecase(snum);
804 conn->short_case_preserve = lp_shortpreservecase(snum);
805
806 conn->encrypt_level = lp_smb_encrypt(snum);
807
808 conn->veto_list = NULL;
809 conn->hide_list = NULL;
810 conn->veto_oplock_list = NULL;
811 conn->aio_write_behind_list = NULL;
812 string_set(&conn->dirpath,"");
813 string_set(&conn->user,user);
814
815 conn->read_only = lp_readonly(SNUM(conn));
816 conn->admin_user = False;
817
818 /*
819 * If force user is true, then store the given userid and the gid of
820 * the user we're forcing.
821 * For auxiliary groups see below.
822 */
823
824 if (*lp_force_user(snum)) {
825 NTSTATUS status2;
826
827 status2 = find_forced_user(conn,
828 (vuser != NULL) && vuser->guest,
829 user);
830 if (!NT_STATUS_IS_OK(status2)) {
831 conn_free(conn);
832 *status = status2;
833 return NULL;
834 }
835 string_set(&conn->user,user);
836 conn->force_user = True;
837 DEBUG(3,("Forced user %s\n",user));
838 }
839
840 /*
841 * If force group is true, then override
842 * any groupid stored for the connecting user.
843 */
844
845 if (*lp_force_group(snum)) {
846 NTSTATUS status2;
847 DOM_SID group_sid;
848
849 status2 = find_forced_group(conn->force_user,
850 snum, user,
851 &group_sid, &conn->gid);
852 if (!NT_STATUS_IS_OK(status2)) {
853 conn_free(conn);
854 *status = status2;
855 return NULL;
856 }
857
858 if ((conn->nt_user_token == NULL) && (vuser != NULL)) {
859
860 /* Not force user and not security=share, but force
861 * group. vuser has a token to copy */
862
863 conn->nt_user_token = dup_nt_token(
864 NULL, vuser->nt_user_token);
865 if (conn->nt_user_token == NULL) {
866 DEBUG(0, ("dup_nt_token failed\n"));
867 conn_free(conn);
868 *status = NT_STATUS_NO_MEMORY;
869 return NULL;
870 }
871 }
872
873 /* If conn->nt_user_token is still NULL, we have
874 * security=share. This means ignore the SID, as we had no
875 * vuser to copy from */
876
877 if (conn->nt_user_token != NULL) {
878 /* Overwrite the primary group sid */
879 sid_copy(&conn->nt_user_token->user_sids[1],
880 &group_sid);
881
882 }
883 conn->force_group = True;
884 }
885
886 if (conn->nt_user_token != NULL) {
887 size_t i;
888
889 /* We have a share-specific token from force [user|group].
890 * This means we have to create the list of unix groups from
891 * the list of sids. */
892
893 conn->ngroups = 0;
894 conn->groups = NULL;
895
896 for (i=0; i<conn->nt_user_token->num_sids; i++) {
897 gid_t gid;
898 DOM_SID *sid = &conn->nt_user_token->user_sids[i];
899
900 if (!sid_to_gid(sid, &gid)) {
901 DEBUG(10, ("Could not convert SID %s to gid, "
902 "ignoring it\n",
903 sid_string_dbg(sid)));
904 continue;
905 }
906 if (!add_gid_to_array_unique(conn->mem_ctx, gid, &conn->groups,
907 &conn->ngroups)) {
908 DEBUG(0, ("add_gid_to_array_unique failed\n"));
909 conn_free(conn);
910 *status = NT_STATUS_NO_MEMORY;
911 return NULL;
912 }
913 }
914 }
915
916 {
917 char *s = talloc_sub_advanced(talloc_tos(),
918 lp_servicename(SNUM(conn)), conn->user,
919 conn->connectpath, conn->gid,
920 get_current_username(),
921 current_user_info.domain,
922 lp_pathname(snum));
923 if (!s) {
924 conn_free(conn);
925 *status = NT_STATUS_NO_MEMORY;
926 return NULL;
927 }
928
929 if (!set_conn_connectpath(conn,s)) {
930 TALLOC_FREE(s);
931 conn_free(conn);
932 *status = NT_STATUS_NO_MEMORY;
933 return NULL;
934 }
935 DEBUG(3,("Connect path is '%s' for service [%s]\n",s,
936 lp_servicename(snum)));
937 TALLOC_FREE(s);
938 }
939
940 /*
941 * New code to check if there's a share security descripter
942 * added from NT server manager. This is done after the
943 * smb.conf checks are done as we need a uid and token. JRA.
944 *
945 */
946
947 {
948 bool can_write = False;
949 NT_USER_TOKEN *token = conn->nt_user_token ?
950 conn->nt_user_token :
951 (vuser ? vuser->nt_user_token : NULL);
952
953 /*
954 * I don't believe this can happen. But the
955 * logic above is convoluted enough to confuse
956 * automated checkers, so be sure. JRA.
957 */
958
959 if (token == NULL) {
960 DEBUG(0,("make_connection: connection to %s "
961 "denied due to missing "
962 "NT token.\n",
963 lp_servicename(snum)));
964 conn_free(conn);
965 *status = NT_STATUS_ACCESS_DENIED;
966 return NULL;
967 }
968
969 can_write = share_access_check(token,
970 lp_servicename(snum),
971 FILE_WRITE_DATA);
972
973 if (!can_write) {
974 if (!share_access_check(token,
975 lp_servicename(snum),
976 FILE_READ_DATA)) {
977 /* No access, read or write. */
978 DEBUG(0,("make_connection: connection to %s "
979 "denied due to security "
980 "descriptor.\n",
981 lp_servicename(snum)));
982 conn_free(conn);
983 *status = NT_STATUS_ACCESS_DENIED;
984 return NULL;
985 } else {
986 conn->read_only = True;
987 }
988 }
989 }
990 /* Initialise VFS function pointers */
991
992 if (!smbd_vfs_init(conn)) {
993 DEBUG(0, ("vfs_init failed for service %s\n",
994 lp_servicename(snum)));
995 conn_free(conn);
996 *status = NT_STATUS_BAD_NETWORK_NAME;
997 return NULL;
998 }
999
1000 /*
1001 * If widelinks are disallowed we need to canonicalise the connect
1002 * path here to ensure we don't have any symlinks in the
1003 * connectpath. We will be checking all paths on this connection are
1004 * below this directory. We must do this after the VFS init as we
1005 * depend on the realpath() pointer in the vfs table. JRA.
1006 */
1007 if (!lp_widelinks(snum)) {
1008 if (!canonicalize_connect_path(conn)) {
1009 DEBUG(0, ("canonicalize_connect_path failed "
1010 "for service %s, path %s\n",
1011 lp_servicename(snum),
1012 conn->connectpath));
1013 conn_free(conn);
1014 *status = NT_STATUS_BAD_NETWORK_NAME;
1015 return NULL;
1016 }
1017 }
1018
1019 if ((!conn->printer) && (!conn->ipc)) {
1020 conn->notify_ctx = notify_init(conn->mem_ctx, server_id_self(),
1021 smbd_messaging_context(),
1022 smbd_event_context(),
1023 conn);
1024 }
1025
1026 /* ROOT Activities: */
1027 /*
1028 * Enforce the max connections parameter.
1029 */
1030
1031 if ((lp_max_connections(snum) > 0)
1032 && (count_current_connections(lp_servicename(SNUM(conn)), True) >=
1033 lp_max_connections(snum))) {
1034
1035 DEBUG(1, ("Max connections (%d) exceeded for %s\n",
1036 lp_max_connections(snum), lp_servicename(snum)));
1037 conn_free(conn);
1038 *status = NT_STATUS_INSUFFICIENT_RESOURCES;
1039 return NULL;
1040 }
1041
1042 /*
1043 * Get us an entry in the connections db
1044 */
1045 if (!claim_connection(conn, lp_servicename(snum), 0)) {
1046 DEBUG(1, ("Could not store connections entry\n"));
1047 conn_free(conn);
1048 *status = NT_STATUS_INTERNAL_DB_ERROR;
1049 return NULL;
1050 }
1051
1052 /* Preexecs are done here as they might make the dir we are to ChDir
1053 * to below */
1054 /* execute any "root preexec = " line */
1055 if (*lp_rootpreexec(snum)) {
1056 char *cmd = talloc_sub_advanced(talloc_tos(),
1057 lp_servicename(SNUM(conn)), conn->user,
1058 conn->connectpath, conn->gid,
1059 get_current_username(),
1060 current_user_info.domain,
1061 lp_rootpreexec(snum));
1062 DEBUG(5,("cmd=%s\n",cmd));
1063 ret = smbrun(cmd,NULL);
1064 TALLOC_FREE(cmd);
1065 if (ret != 0 && lp_rootpreexec_close(snum)) {
1066 DEBUG(1,("root preexec gave %d - failing "
1067 "connection\n", ret));
1068 yield_connection(conn, lp_servicename(snum));
1069 conn_free(conn);
1070 *status = NT_STATUS_ACCESS_DENIED;
1071 return NULL;
1072 }
1073 }
1074
1075 /* USER Activites: */
1076 if (!change_to_user(conn, conn->vuid)) {
1077 /* No point continuing if they fail the basic checks */
1078 DEBUG(0,("Can't become connected user!\n"));
1079 yield_connection(conn, lp_servicename(snum));
1080 conn_free(conn);
1081 *status = NT_STATUS_LOGON_FAILURE;
1082 return NULL;
1083 }
1084
1085 /* Remember that a different vuid can connect later without these
1086 * checks... */
1087
1088 /* Preexecs are done here as they might make the dir we are to ChDir
1089 * to below */
1090
1091 /* execute any "preexec = " line */
1092 if (*lp_preexec(snum)) {
1093 char *cmd = talloc_sub_advanced(talloc_tos(),
1094 lp_servicename(SNUM(conn)), conn->user,
1095 conn->connectpath, conn->gid,
1096 get_current_username(),
1097 current_user_info.domain,
1098 lp_preexec(snum));
1099 ret = smbrun(cmd,NULL);
1100 TALLOC_FREE(cmd);
1101 if (ret != 0 && lp_preexec_close(snum)) {
1102 DEBUG(1,("preexec gave %d - failing connection\n",
1103 ret));
1104 *status = NT_STATUS_ACCESS_DENIED;
1105 goto err_root_exit;
1106 }
1107 }
1108
1109 #ifdef WITH_FAKE_KASERVER
1110 if (lp_afs_share(snum)) {
1111 afs_login(conn);
1112 }
1113 #endif
1114
1115 /* Add veto/hide lists */
1116 if (!IS_IPC(conn) && !IS_PRINT(conn)) {
1117 set_namearray( &conn->veto_list, lp_veto_files(snum));
1118 set_namearray( &conn->hide_list, lp_hide_files(snum));
1119 set_namearray( &conn->veto_oplock_list, lp_veto_oplocks(snum));
1120 set_namearray( &conn->aio_write_behind_list,
1121 lp_aio_write_behind(snum));
1122 }
1123
1124 /* Invoke VFS make connection hook - do this before the VFS_STAT call
1125 to allow any filesystems needing user credentials to initialize
1126 themselves. */
1127
1128 if (SMB_VFS_CONNECT(conn, lp_servicename(snum), user) < 0) {
1129 DEBUG(0,("make_connection: VFS make connection failed!\n"));
1130 *status = NT_STATUS_UNSUCCESSFUL;
1131 goto err_root_exit;
1132 }
1133
1134 /* Any error exit after here needs to call the disconnect hook. */
1135 on_err_call_dis_hook = true;
1136
1137 /* win2000 does not check the permissions on the directory
1138 during the tree connect, instead relying on permission
1139 check during individual operations. To match this behaviour
1140 I have disabled this chdir check (tridge) */
1141 /* the alternative is just to check the directory exists */
1142 if ((ret = SMB_VFS_STAT(conn, conn->connectpath, &st)) != 0 ||
1143 !S_ISDIR(st.st_mode)) {
1144 if (ret == 0 && !S_ISDIR(st.st_mode)) {
1145 DEBUG(0,("'%s' is not a directory, when connecting to "
1146 "[%s]\n", conn->connectpath,
1147 lp_servicename(snum)));
1148 } else {
1149 DEBUG(0,("'%s' does not exist or permission denied "
1150 "when connecting to [%s] Error was %s\n",
1151 conn->connectpath, lp_servicename(snum),
1152 strerror(errno) ));
1153 }
1154 *status = NT_STATUS_BAD_NETWORK_NAME;
1155 goto err_root_exit;
1156 }
1157
1158 string_set(&conn->origpath,conn->connectpath);
1159
1160 #if SOFTLINK_OPTIMISATION
1161 /* resolve any soft links early if possible */
1162 if (vfs_ChDir(conn,conn->connectpath) == 0) {
1163 TALLOC_CTX *ctx = talloc_tos();
1164 char *s = vfs_GetWd(ctx,s);
1165 if (!s) {
1166 *status = map_nt_error_from_unix(errno);
1167 goto err_root_exit;
1168 }
1169 if (!set_conn_connectpath(conn,s)) {
1170 *status = NT_STATUS_NO_MEMORY;
1171 goto err_root_exit;
1172 }
1173 vfs_ChDir(conn,conn->connectpath);
1174 }
1175 #endif
1176
1177 /* Figure out the characteristics of the underlying filesystem. This
1178 * assumes that all the filesystem mounted withing a share path have
1179 * the same characteristics, which is likely but not guaranteed.
1180 */
1181
1182 conn->fs_capabilities = SMB_VFS_FS_CAPABILITIES(conn);
1183
1184 /*
1185 * Print out the 'connected as' stuff here as we need
1186 * to know the effective uid and gid we will be using
1187 * (at least initially).
1188 */
1189
1190 if( DEBUGLVL( IS_IPC(conn) ? 3 : 1 ) ) {
1191 dbgtext( "%s (%s) ", get_remote_machine_name(),
1192 conn->client_address );
1193 dbgtext( "%s", srv_is_signing_active() ? "signed " : "");
1194 dbgtext( "connect to service %s ", lp_servicename(snum) );
1195 dbgtext( "initially as user %s ", user );
1196 dbgtext( "(uid=%d, gid=%d) ", (int)geteuid(), (int)getegid() );
1197 dbgtext( "(pid %d)\n", (int)sys_getpid() );
1198 }
1199
1200 /* we've finished with the user stuff - go back to root */
1201 change_to_root_user();
1202 return(conn);
1203
1204 err_root_exit:
1205
1206 change_to_root_user();
1207 if (on_err_call_dis_hook) {
1208 /* Call VFS disconnect hook */
1209 SMB_VFS_DISCONNECT(conn);
1210 }
1211 yield_connection(conn, lp_servicename(snum));
1212 conn_free(conn);
1213 return NULL;
1214 }
1215
1216 /***************************************************************************************
1217 Simple wrapper function for make_connection() to include a call to
1218 vfs_chdir()
1219 **************************************************************************************/
1220
1221 connection_struct *make_connection_with_chdir(const char *service_in,
1222 DATA_BLOB password,
1223 const char *dev, uint16 vuid,
1224 NTSTATUS *status)
1225 {
1226 connection_struct *conn = NULL;
1227
1228 conn = make_connection(service_in, password, dev, vuid, status);
1229
1230 /*
1231 * make_connection() does not change the directory for us any more
1232 * so we have to do it as a separate step --jerry
1233 */
1234
1235 if ( conn && vfs_ChDir(conn,conn->connectpath) != 0 ) {
1236 DEBUG(0,("move_driver_to_download_area: Can't change "
1237 "directory to %s for [print$] (%s)\n",
1238 conn->connectpath,strerror(errno)));
1239 yield_connection(conn, lp_servicename(SNUM(conn)));
1240 conn_free(conn);
1241 *status = NT_STATUS_UNSUCCESSFUL;
1242 return NULL;
1243 }
1244
1245 return conn;
1246 }
1247
1248 /****************************************************************************
1249 Make a connection to a service.
1250 *
1251 * @param service
1252 ****************************************************************************/
1253
1254 connection_struct *make_connection(const char *service_in, DATA_BLOB password,
1255 const char *pdev, uint16 vuid,
1256 NTSTATUS *status)
1257 {
1258 uid_t euid;
1259 user_struct *vuser = NULL;
1260 fstring service;
1261 fstring dev;
1262 int snum = -1;
1263 char addr[INET6_ADDRSTRLEN];
1264
1265 fstrcpy(dev, pdev);
1266
1267 /* This must ONLY BE CALLED AS ROOT. As it exits this function as
1268 * root. */
1269 if (!non_root_mode() && (euid = geteuid()) != 0) {
1270 DEBUG(0,("make_connection: PANIC ERROR. Called as nonroot "
1271 "(%u)\n", (unsigned int)euid ));
1272 smb_panic("make_connection: PANIC ERROR. Called as nonroot\n");
1273 }
1274
1275 if (conn_num_open() > 2047) {
1276 *status = NT_STATUS_INSUFF_SERVER_RESOURCES;
1277 return NULL;
1278 }
1279
1280 if(lp_security() != SEC_SHARE) {
1281 vuser = get_valid_user_struct(vuid);
1282 if (!vuser) {
1283 DEBUG(1,("make_connection: refusing to connect with "
1284 "no session setup\n"));
1285 *status = NT_STATUS_ACCESS_DENIED;
1286 return NULL;
1287 }
1288 }
1289
1290 /* Logic to try and connect to the correct [homes] share, preferably
1291 without too many getpwnam() lookups. This is particulary nasty for
1292 winbind usernames, where the share name isn't the same as unix
1293 username.
1294
1295 The snum of the homes share is stored on the vuser at session setup
1296 time.
1297 */
1298
1299 if (strequal(service_in,HOMES_NAME)) {
1300 if(lp_security() != SEC_SHARE) {
1301 DATA_BLOB no_pw = data_blob_null;
1302 if (vuser->homes_snum == -1) {
1303 DEBUG(2, ("[homes] share not available for "
1304 "this user because it was not found "
1305 "or created at session setup "
1306 "time\n"));
1307 *status = NT_STATUS_BAD_NETWORK_NAME;
1308 return NULL;
1309 }
1310 DEBUG(5, ("making a connection to [homes] service "
1311 "created at session setup time\n"));
1312 return make_connection_snum(vuser->homes_snum,
1313 vuser, no_pw,
1314 dev, status);
1315 } else {
1316 /* Security = share. Try with
1317 * current_user_info.smb_name as the username. */
1318 if (*current_user_info.smb_name) {
1319 fstring unix_username;
1320 fstrcpy(unix_username,
1321 current_user_info.smb_name);
1322 map_username(unix_username);
1323 snum = find_service(unix_username);
1324 }
1325 if (snum != -1) {
1326 DEBUG(5, ("making a connection to 'homes' "
1327 "service %s based on "
1328 "security=share\n", service_in));
1329 return make_connection_snum(snum, NULL,
1330 password,
1331 dev, status);
1332 }
1333 }
1334 } else if ((lp_security() != SEC_SHARE) && (vuser->homes_snum != -1)
1335 && strequal(service_in,
1336 lp_servicename(vuser->homes_snum))) {
1337 DATA_BLOB no_pw = data_blob_null;
1338 DEBUG(5, ("making a connection to 'homes' service [%s] "
1339 "created at session setup time\n", service_in));
1340 return make_connection_snum(vuser->homes_snum,
1341 vuser, no_pw,
1342 dev, status);
1343 }
1344
1345 fstrcpy(service, service_in);
1346
1347 strlower_m(service);
1348
1349 snum = find_service(service);
1350
1351 if (snum < 0) {
1352 if (strequal(service,"IPC$") ||
1353 (lp_enable_asu_support() && strequal(service,"ADMIN$"))) {
1354 DEBUG(3,("refusing IPC connection to %s\n", service));
1355 *status = NT_STATUS_ACCESS_DENIED;
1356 return NULL;
1357 }
1358
1359 DEBUG(0,("%s (%s) couldn't find service %s\n",
1360 get_remote_machine_name(),
1361 client_addr(get_client_fd(),addr,sizeof(addr)),
1362 service));
1363 *status = NT_STATUS_BAD_NETWORK_NAME;
1364 return NULL;
1365 }
1366
1367 /* Handle non-Dfs clients attempting connections to msdfs proxy */
1368 if (lp_host_msdfs() && (*lp_msdfs_proxy(snum) != '\0')) {
1369 DEBUG(3, ("refusing connection to dfs proxy share '%s' "
1370 "(pointing to %s)\n",
1371 service, lp_msdfs_proxy(snum)));
1372 *status = NT_STATUS_BAD_NETWORK_NAME;
1373 return NULL;
1374 }
1375
1376 DEBUG(5, ("making a connection to 'normal' service %s\n", service));
1377
1378 return make_connection_snum(snum, vuser,
1379 password,
1380 dev, status);
1381 }
1382
1383 /****************************************************************************
1384 Close a cnum.
1385 ****************************************************************************/
1386
1387 void close_cnum(connection_struct *conn, uint16 vuid)
1388 {
1389 if (IS_IPC(conn)) {
1390 pipe_close_conn(conn);
1391 } else {
1392 file_close_conn(conn);
1393 dptr_closecnum(conn);
1394 }
1395
1396 change_to_root_user();
1397
1398 DEBUG(IS_IPC(conn)?3:1, ("%s (%s) closed connection to service %s\n",
1399 get_remote_machine_name(),
1400 conn->client_address,
1401 lp_servicename(SNUM(conn))));
1402
1403 /* Call VFS disconnect hook */
1404 SMB_VFS_DISCONNECT(conn);
1405
1406 yield_connection(conn, lp_servicename(SNUM(conn)));
1407
1408 /* make sure we leave the directory available for unmount */
1409 vfs_ChDir(conn, "/");
1410
1411 /* execute any "postexec = " line */
1412 if (*lp_postexec(SNUM(conn)) &&
1413 change_to_user(conn, vuid)) {
1414 char *cmd = talloc_sub_advanced(talloc_tos(),
1415 lp_servicename(SNUM(conn)), conn->user,
1416 conn->connectpath, conn->gid,
1417 get_current_username(),
1418 current_user_info.domain,
1419 lp_postexec(SNUM(conn)));
1420 smbrun(cmd,NULL);
1421 TALLOC_FREE(cmd);
1422 change_to_root_user();
1423 }
1424
1425 change_to_root_user();
1426 /* execute any "root postexec = " line */
1427 if (*lp_rootpostexec(SNUM(conn))) {
1428 char *cmd = talloc_sub_advanced(talloc_tos(),
1429 lp_servicename(SNUM(conn)), conn->user,
1430 conn->connectpath, conn->gid,
1431 get_current_username(),
1432 current_user_info.domain,
1433 lp_rootpostexec(SNUM(conn)));
1434 smbrun(cmd,NULL);
1435 TALLOC_FREE(cmd);
1436 }
1437
1438 conn_free(conn);
1439 }
Samba GIT mirror