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Use talloc_tos() for a temporary getpwnam_alloc in make_connection_snum
[Samba/nascimento.git] / source3 / smbd / service.c
blobf589f0644b84b0d8a99ed21c962ea405f2cf9023
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, lp_force_user(snum), "%S",
533 lp_servicename(snum)))) {
534 return NT_STATUS_NO_MEMORY;
535 }
536
537 result = create_token_from_username(conn, 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 *frame = talloc_stackframe();
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 groupname = talloc_strdup(talloc_tos(), lp_force_group(snum));
575 if (groupname == NULL) {
576 DEBUG(1, ("talloc_strdup failed\n"));
577 result = NT_STATUS_NO_MEMORY;
578 goto done;
579 }
580
581 if (groupname[0] == '+') {
582 user_must_be_member = True;
583 groupname += 1;
584 }
585
586 groupname = talloc_string_sub(talloc_tos(), groupname,
587 "%S", lp_servicename(snum));
588
589 if (!lookup_name_smbconf(talloc_tos(), groupname,
590 LOOKUP_NAME_ALL|LOOKUP_NAME_GROUP,
591 NULL, NULL, &group_sid, &type)) {
592 DEBUG(10, ("lookup_name_smbconf(%s) failed\n",
593 groupname));
594 goto done;
595 }
596
597 if ((type != SID_NAME_DOM_GRP) && (type != SID_NAME_ALIAS) &&
598 (type != SID_NAME_WKN_GRP)) {
599 DEBUG(10, ("%s is a %s, not a group\n", groupname,
600 sid_type_lookup(type)));
601 goto done;
602 }
603
604 if (!sid_to_gid(&group_sid, &gid)) {
605 DEBUG(10, ("sid_to_gid(%s) for %s failed\n",
606 sid_string_dbg(&group_sid), groupname));
607 goto done;
608 }
609
610 /*
611 * If the user has been forced and the forced group starts with a '+',
612 * then we only set the group to be the forced group if the forced
613 * user is a member of that group. Otherwise, the meaning of the '+'
614 * would be ignored.
615 */
616
617 if (force_user && user_must_be_member) {
618 if (user_in_group_sid(username, &group_sid)) {
619 sid_copy(pgroup_sid, &group_sid);
620 *pgid = gid;
621 DEBUG(3,("Forced group %s for member %s\n",
622 groupname, username));
623 } else {
624 DEBUG(0,("find_forced_group: forced user %s is not a member "
625 "of forced group %s. Disallowing access.\n",
626 username, groupname ));
627 result = NT_STATUS_MEMBER_NOT_IN_GROUP;
628 goto done;
629 }
630 } else {
631 sid_copy(pgroup_sid, &group_sid);
632 *pgid = gid;
633 DEBUG(3,("Forced group %s\n", groupname));
634 }
635
636 result = NT_STATUS_OK;
637 done:
638 TALLOC_FREE(frame);
639 return result;
640 }
641
642 /****************************************************************************
643 Make a connection, given the snum to connect to, and the vuser of the
644 connecting user if appropriate.
645 ****************************************************************************/
646
647 static connection_struct *make_connection_snum(int snum, user_struct *vuser,
648 DATA_BLOB password,
649 const char *pdev,
650 NTSTATUS *status)
651 {
652 struct passwd *pass = NULL;
653 bool guest = False;
654 connection_struct *conn;
655 SMB_STRUCT_STAT st;
656 fstring user;
657 fstring dev;
658 int ret;
659 char addr[INET6_ADDRSTRLEN];
660 bool on_err_call_dis_hook = false;
661
662 *user = 0;
663 fstrcpy(dev, pdev);
664 SET_STAT_INVALID(st);
665
666 if (NT_STATUS_IS_ERR(*status = share_sanity_checks(snum, dev))) {
667 return NULL;
668 }
669
670 conn = conn_new();
671 if (!conn) {
672 DEBUG(0,("Couldn't find free connection.\n"));
673 *status = NT_STATUS_INSUFFICIENT_RESOURCES;
674 return NULL;
675 }
676
677 conn->params->service = snum;
678 conn->nt_user_token = NULL;
679
680 if (lp_guest_only(snum)) {
681 const char *guestname = lp_guestaccount();
682 NTSTATUS status2;
683 char *found_username = NULL;
684
685 guest = True;
686 pass = getpwnam_alloc(talloc_tos(), guestname);
687 if (!pass) {
688 DEBUG(0,("make_connection_snum: Invalid guest "
689 "account %s??\n",guestname));
690 conn_free(conn);
691 *status = NT_STATUS_NO_SUCH_USER;
692 return NULL;
693 }
694 status2 = create_token_from_username(conn, pass->pw_name, True,
695 &conn->uid, &conn->gid,
696 &found_username,
697 &conn->nt_user_token);
698 if (!NT_STATUS_IS_OK(status2)) {
699 TALLOC_FREE(pass);
700 conn_free(conn);
701 *status = status2;
702 return NULL;
703 }
704 fstrcpy(user, found_username);
705 string_set(&conn->user,user);
706 conn->force_user = True;
707 TALLOC_FREE(found_username);
708 TALLOC_FREE(pass);
709 DEBUG(3,("Guest only user %s\n",user));
710 } else if (vuser) {
711 if (vuser->server_info->guest) {
712 if (!lp_guest_ok(snum)) {
713 DEBUG(2, ("guest user (from session setup) "
714 "not permitted to access this share "
715 "(%s)\n", lp_servicename(snum)));
716 conn_free(conn);
717 *status = NT_STATUS_ACCESS_DENIED;
718 return NULL;
719 }
720 } else {
721 if (!user_ok_token(vuser->server_info->unix_name,
722 vuser->server_info->ptok, snum)) {
723 DEBUG(2, ("user '%s' (from session setup) not "
724 "permitted to access this share "
725 "(%s)\n",
726 vuser->server_info->unix_name,
727 lp_servicename(snum)));
728 conn_free(conn);
729 *status = NT_STATUS_ACCESS_DENIED;
730 return NULL;
731 }
732 }
733 conn->vuid = vuser->vuid;
734 conn->uid = vuser->server_info->uid;
735 conn->gid = vuser->server_info->gid;
736 string_set(&conn->user,vuser->server_info->unix_name);
737 fstrcpy(user,vuser->server_info->unix_name);
738 guest = vuser->server_info->guest;
739 } else if (lp_security() == SEC_SHARE) {
740 NTSTATUS status2;
741 char *found_username = NULL;
742
743 /* add it as a possible user name if we
744 are in share mode security */
745 add_session_user(lp_servicename(snum));
746 /* shall we let them in? */
747 if (!authorise_login(snum,user,password,&guest)) {
748 DEBUG( 2, ( "Invalid username/password for [%s]\n",
749 lp_servicename(snum)) );
750 conn_free(conn);
751 *status = NT_STATUS_WRONG_PASSWORD;
752 return NULL;
753 }
754 pass = Get_Pwnam_alloc(talloc_tos(), user);
755 status2 = create_token_from_username(conn, pass->pw_name, True,
756 &conn->uid, &conn->gid,
757 &found_username,
758 &conn->nt_user_token);
759 TALLOC_FREE(pass);
760 if (!NT_STATUS_IS_OK(status2)) {
761 conn_free(conn);
762 *status = status2;
763 return NULL;
764 }
765 fstrcpy(user, found_username);
766 string_set(&conn->user,user);
767 TALLOC_FREE(found_username);
768 conn->force_user = True;
769 } else {
770 DEBUG(0, ("invalid VUID (vuser) but not in security=share\n"));
771 conn_free(conn);
772 *status = NT_STATUS_ACCESS_DENIED;
773 return NULL;
774 }
775
776 add_session_user(user);
777
778 safe_strcpy(conn->client_address,
779 client_addr(get_client_fd(),addr,sizeof(addr)),
780 sizeof(conn->client_address)-1);
781 conn->num_files_open = 0;
782 conn->lastused = conn->lastused_count = time(NULL);
783 conn->used = True;
784 conn->printer = (strncmp(dev,"LPT",3) == 0);
785 conn->ipc = ( (strncmp(dev,"IPC",3) == 0) ||
786 ( lp_enable_asu_support() && strequal(dev,"ADMIN$")) );
787 conn->dirptr = NULL;
788
789 /* Case options for the share. */
790 if (lp_casesensitive(snum) == Auto) {
791 /* We will be setting this per packet. Set to be case
792 * insensitive for now. */
793 conn->case_sensitive = False;
794 } else {
795 conn->case_sensitive = (bool)lp_casesensitive(snum);
796 }
797
798 conn->case_preserve = lp_preservecase(snum);
799 conn->short_case_preserve = lp_shortpreservecase(snum);
800
801 conn->encrypt_level = lp_smb_encrypt(snum);
802
803 conn->veto_list = NULL;
804 conn->hide_list = NULL;
805 conn->veto_oplock_list = NULL;
806 conn->aio_write_behind_list = NULL;
807 string_set(&conn->dirpath,"");
808 string_set(&conn->user,user);
809
810 conn->read_only = lp_readonly(SNUM(conn));
811 conn->admin_user = False;
812
813 /*
814 * If force user is true, then store the given userid and the gid of
815 * the user we're forcing.
816 * For auxiliary groups see below.
817 */
818
819 if (*lp_force_user(snum)) {
820 NTSTATUS status2;
821
822 status2 = find_forced_user(conn,
823 (vuser != NULL) && vuser->server_info->guest,
824 user);
825 if (!NT_STATUS_IS_OK(status2)) {
826 conn_free(conn);
827 *status = status2;
828 return NULL;
829 }
830 string_set(&conn->user,user);
831 conn->force_user = True;
832 DEBUG(3,("Forced user %s\n",user));
833 }
834
835 /*
836 * If force group is true, then override
837 * any groupid stored for the connecting user.
838 */
839
840 if (*lp_force_group(snum)) {
841 NTSTATUS status2;
842 DOM_SID group_sid;
843
844 status2 = find_forced_group(conn->force_user,
845 snum, user,
846 &group_sid, &conn->gid);
847 if (!NT_STATUS_IS_OK(status2)) {
848 conn_free(conn);
849 *status = status2;
850 return NULL;
851 }
852
853 if ((conn->nt_user_token == NULL) && (vuser != NULL)) {
854
855 /* Not force user and not security=share, but force
856 * group. vuser has a token to copy */
857
858 conn->nt_user_token = dup_nt_token(
859 NULL, vuser->server_info->ptok);
860 if (conn->nt_user_token == NULL) {
861 DEBUG(0, ("dup_nt_token failed\n"));
862 conn_free(conn);
863 *status = NT_STATUS_NO_MEMORY;
864 return NULL;
865 }
866 }
867
868 /* If conn->nt_user_token is still NULL, we have
869 * security=share. This means ignore the SID, as we had no
870 * vuser to copy from */
871
872 if (conn->nt_user_token != NULL) {
873 /* Overwrite the primary group sid */
874 sid_copy(&conn->nt_user_token->user_sids[1],
875 &group_sid);
876
877 }
878 conn->force_group = True;
879 }
880
881 if (conn->nt_user_token != NULL) {
882 size_t i;
883
884 /* We have a share-specific token from force [user|group].
885 * This means we have to create the list of unix groups from
886 * the list of sids. */
887
888 conn->ngroups = 0;
889 conn->groups = NULL;
890
891 for (i=0; i<conn->nt_user_token->num_sids; i++) {
892 gid_t gid;
893 DOM_SID *sid = &conn->nt_user_token->user_sids[i];
894
895 if (!sid_to_gid(sid, &gid)) {
896 DEBUG(10, ("Could not convert SID %s to gid, "
897 "ignoring it\n",
898 sid_string_dbg(sid)));
899 continue;
900 }
901 if (!add_gid_to_array_unique(conn, gid, &conn->groups,
902 &conn->ngroups)) {
903 DEBUG(0, ("add_gid_to_array_unique failed\n"));
904 conn_free(conn);
905 *status = NT_STATUS_NO_MEMORY;
906 return NULL;
907 }
908 }
909 }
910
911 {
912 char *s = talloc_sub_advanced(talloc_tos(),
913 lp_servicename(SNUM(conn)), conn->user,
914 conn->connectpath, conn->gid,
915 get_current_username(),
916 current_user_info.domain,
917 lp_pathname(snum));
918 if (!s) {
919 conn_free(conn);
920 *status = NT_STATUS_NO_MEMORY;
921 return NULL;
922 }
923
924 if (!set_conn_connectpath(conn,s)) {
925 TALLOC_FREE(s);
926 conn_free(conn);
927 *status = NT_STATUS_NO_MEMORY;
928 return NULL;
929 }
930 DEBUG(3,("Connect path is '%s' for service [%s]\n",s,
931 lp_servicename(snum)));
932 TALLOC_FREE(s);
933 }
934
935 /*
936 * New code to check if there's a share security descripter
937 * added from NT server manager. This is done after the
938 * smb.conf checks are done as we need a uid and token. JRA.
939 *
940 */
941
942 {
943 bool can_write = False;
944 NT_USER_TOKEN *token = conn->nt_user_token ?
945 conn->nt_user_token :
946 (vuser ? vuser->server_info->ptok : NULL);
947
948 /*
949 * I don't believe this can happen. But the
950 * logic above is convoluted enough to confuse
951 * automated checkers, so be sure. JRA.
952 */
953
954 if (token == NULL) {
955 DEBUG(0,("make_connection: connection to %s "
956 "denied due to missing "
957 "NT token.\n",
958 lp_servicename(snum)));
959 conn_free(conn);
960 *status = NT_STATUS_ACCESS_DENIED;
961 return NULL;
962 }
963
964 can_write = share_access_check(token,
965 lp_servicename(snum),
966 FILE_WRITE_DATA);
967
968 if (!can_write) {
969 if (!share_access_check(token,
970 lp_servicename(snum),
971 FILE_READ_DATA)) {
972 /* No access, read or write. */
973 DEBUG(0,("make_connection: connection to %s "
974 "denied due to security "
975 "descriptor.\n",
976 lp_servicename(snum)));
977 conn_free(conn);
978 *status = NT_STATUS_ACCESS_DENIED;
979 return NULL;
980 } else {
981 conn->read_only = True;
982 }
983 }
984 }
985 /* Initialise VFS function pointers */
986
987 if (!smbd_vfs_init(conn)) {
988 DEBUG(0, ("vfs_init failed for service %s\n",
989 lp_servicename(snum)));
990 conn_free(conn);
991 *status = NT_STATUS_BAD_NETWORK_NAME;
992 return NULL;
993 }
994
995 /*
996 * If widelinks are disallowed we need to canonicalise the connect
997 * path here to ensure we don't have any symlinks in the
998 * connectpath. We will be checking all paths on this connection are
999 * below this directory. We must do this after the VFS init as we
1000 * depend on the realpath() pointer in the vfs table. JRA.
1001 */
1002 if (!lp_widelinks(snum)) {
1003 if (!canonicalize_connect_path(conn)) {
1004 DEBUG(0, ("canonicalize_connect_path failed "
1005 "for service %s, path %s\n",
1006 lp_servicename(snum),
1007 conn->connectpath));
1008 conn_free(conn);
1009 *status = NT_STATUS_BAD_NETWORK_NAME;
1010 return NULL;
1011 }
1012 }
1013
1014 if ((!conn->printer) && (!conn->ipc)) {
1015 conn->notify_ctx = notify_init(conn, server_id_self(),
1016 smbd_messaging_context(),
1017 smbd_event_context(),
1018 conn);
1019 }
1020
1021 /* ROOT Activities: */
1022 /*
1023 * Enforce the max connections parameter.
1024 */
1025
1026 if ((lp_max_connections(snum) > 0)
1027 && (count_current_connections(lp_servicename(SNUM(conn)), True) >=
1028 lp_max_connections(snum))) {
1029
1030 DEBUG(1, ("Max connections (%d) exceeded for %s\n",
1031 lp_max_connections(snum), lp_servicename(snum)));
1032 conn_free(conn);
1033 *status = NT_STATUS_INSUFFICIENT_RESOURCES;
1034 return NULL;
1035 }
1036
1037 /*
1038 * Get us an entry in the connections db
1039 */
1040 if (!claim_connection(conn, lp_servicename(snum), 0)) {
1041 DEBUG(1, ("Could not store connections entry\n"));
1042 conn_free(conn);
1043 *status = NT_STATUS_INTERNAL_DB_ERROR;
1044 return NULL;
1045 }
1046
1047 /* Preexecs are done here as they might make the dir we are to ChDir
1048 * to below */
1049 /* execute any "root preexec = " line */
1050 if (*lp_rootpreexec(snum)) {
1051 char *cmd = talloc_sub_advanced(talloc_tos(),
1052 lp_servicename(SNUM(conn)), conn->user,
1053 conn->connectpath, conn->gid,
1054 get_current_username(),
1055 current_user_info.domain,
1056 lp_rootpreexec(snum));
1057 DEBUG(5,("cmd=%s\n",cmd));
1058 ret = smbrun(cmd,NULL);
1059 TALLOC_FREE(cmd);
1060 if (ret != 0 && lp_rootpreexec_close(snum)) {
1061 DEBUG(1,("root preexec gave %d - failing "
1062 "connection\n", ret));
1063 yield_connection(conn, lp_servicename(snum));
1064 conn_free(conn);
1065 *status = NT_STATUS_ACCESS_DENIED;
1066 return NULL;
1067 }
1068 }
1069
1070 /* USER Activites: */
1071 if (!change_to_user(conn, conn->vuid)) {
1072 /* No point continuing if they fail the basic checks */
1073 DEBUG(0,("Can't become connected user!\n"));
1074 yield_connection(conn, lp_servicename(snum));
1075 conn_free(conn);
1076 *status = NT_STATUS_LOGON_FAILURE;
1077 return NULL;
1078 }
1079
1080 /* Remember that a different vuid can connect later without these
1081 * checks... */
1082
1083 /* Preexecs are done here as they might make the dir we are to ChDir
1084 * to below */
1085
1086 /* execute any "preexec = " line */
1087 if (*lp_preexec(snum)) {
1088 char *cmd = talloc_sub_advanced(talloc_tos(),
1089 lp_servicename(SNUM(conn)), conn->user,
1090 conn->connectpath, conn->gid,
1091 get_current_username(),
1092 current_user_info.domain,
1093 lp_preexec(snum));
1094 ret = smbrun(cmd,NULL);
1095 TALLOC_FREE(cmd);
1096 if (ret != 0 && lp_preexec_close(snum)) {
1097 DEBUG(1,("preexec gave %d - failing connection\n",
1098 ret));
1099 *status = NT_STATUS_ACCESS_DENIED;
1100 goto err_root_exit;
1101 }
1102 }
1103
1104 #ifdef WITH_FAKE_KASERVER
1105 if (lp_afs_share(snum)) {
1106 afs_login(conn);
1107 }
1108 #endif
1109
1110 /* Add veto/hide lists */
1111 if (!IS_IPC(conn) && !IS_PRINT(conn)) {
1112 set_namearray( &conn->veto_list, lp_veto_files(snum));
1113 set_namearray( &conn->hide_list, lp_hide_files(snum));
1114 set_namearray( &conn->veto_oplock_list, lp_veto_oplocks(snum));
1115 }
1116
1117 /* Invoke VFS make connection hook - do this before the VFS_STAT call
1118 to allow any filesystems needing user credentials to initialize
1119 themselves. */
1120
1121 if (SMB_VFS_CONNECT(conn, lp_servicename(snum), user) < 0) {
1122 DEBUG(0,("make_connection: VFS make connection failed!\n"));
1123 *status = NT_STATUS_UNSUCCESSFUL;
1124 goto err_root_exit;
1125 }
1126
1127 /* Any error exit after here needs to call the disconnect hook. */
1128 on_err_call_dis_hook = true;
1129
1130 /* win2000 does not check the permissions on the directory
1131 during the tree connect, instead relying on permission
1132 check during individual operations. To match this behaviour
1133 I have disabled this chdir check (tridge) */
1134 /* the alternative is just to check the directory exists */
1135 if ((ret = SMB_VFS_STAT(conn, conn->connectpath, &st)) != 0 ||
1136 !S_ISDIR(st.st_mode)) {
1137 if (ret == 0 && !S_ISDIR(st.st_mode)) {
1138 DEBUG(0,("'%s' is not a directory, when connecting to "
1139 "[%s]\n", conn->connectpath,
1140 lp_servicename(snum)));
1141 } else {
1142 DEBUG(0,("'%s' does not exist or permission denied "
1143 "when connecting to [%s] Error was %s\n",
1144 conn->connectpath, lp_servicename(snum),
1145 strerror(errno) ));
1146 }
1147 *status = NT_STATUS_BAD_NETWORK_NAME;
1148 goto err_root_exit;
1149 }
1150
1151 string_set(&conn->origpath,conn->connectpath);
1152
1153 #if SOFTLINK_OPTIMISATION
1154 /* resolve any soft links early if possible */
1155 if (vfs_ChDir(conn,conn->connectpath) == 0) {
1156 TALLOC_CTX *ctx = talloc_tos();
1157 char *s = vfs_GetWd(ctx,s);
1158 if (!s) {
1159 *status = map_nt_error_from_unix(errno);
1160 goto err_root_exit;
1161 }
1162 if (!set_conn_connectpath(conn,s)) {
1163 *status = NT_STATUS_NO_MEMORY;
1164 goto err_root_exit;
1165 }
1166 vfs_ChDir(conn,conn->connectpath);
1167 }
1168 #endif
1169
1170 /* Figure out the characteristics of the underlying filesystem. This
1171 * assumes that all the filesystem mounted withing a share path have
1172 * the same characteristics, which is likely but not guaranteed.
1173 */
1174
1175 conn->fs_capabilities = SMB_VFS_FS_CAPABILITIES(conn);
1176
1177 /*
1178 * Print out the 'connected as' stuff here as we need
1179 * to know the effective uid and gid we will be using
1180 * (at least initially).
1181 */
1182
1183 if( DEBUGLVL( IS_IPC(conn) ? 3 : 1 ) ) {
1184 dbgtext( "%s (%s) ", get_remote_machine_name(),
1185 conn->client_address );
1186 dbgtext( "%s", srv_is_signing_active() ? "signed " : "");
1187 dbgtext( "connect to service %s ", lp_servicename(snum) );
1188 dbgtext( "initially as user %s ", user );
1189 dbgtext( "(uid=%d, gid=%d) ", (int)geteuid(), (int)getegid() );
1190 dbgtext( "(pid %d)\n", (int)sys_getpid() );
1191 }
1192
1193 /* we've finished with the user stuff - go back to root */
1194 change_to_root_user();
1195 return(conn);
1196
1197 err_root_exit:
1198
1199 change_to_root_user();
1200 if (on_err_call_dis_hook) {
1201 /* Call VFS disconnect hook */
1202 SMB_VFS_DISCONNECT(conn);
1203 }
1204 yield_connection(conn, lp_servicename(snum));
1205 conn_free(conn);
1206 return NULL;
1207 }
1208
1209 /***************************************************************************************
1210 Simple wrapper function for make_connection() to include a call to
1211 vfs_chdir()
1212 **************************************************************************************/
1213
1214 connection_struct *make_connection_with_chdir(const char *service_in,
1215 DATA_BLOB password,
1216 const char *dev, uint16 vuid,
1217 NTSTATUS *status)
1218 {
1219 connection_struct *conn = NULL;
1220
1221 conn = make_connection(service_in, password, dev, vuid, status);
1222
1223 /*
1224 * make_connection() does not change the directory for us any more
1225 * so we have to do it as a separate step --jerry
1226 */
1227
1228 if ( conn && vfs_ChDir(conn,conn->connectpath) != 0 ) {
1229 DEBUG(0,("move_driver_to_download_area: Can't change "
1230 "directory to %s for [print$] (%s)\n",
1231 conn->connectpath,strerror(errno)));
1232 yield_connection(conn, lp_servicename(SNUM(conn)));
1233 conn_free(conn);
1234 *status = NT_STATUS_UNSUCCESSFUL;
1235 return NULL;
1236 }
1237
1238 return conn;
1239 }
1240
1241 /****************************************************************************
1242 Make a connection to a service.
1243 *
1244 * @param service
1245 ****************************************************************************/
1246
1247 connection_struct *make_connection(const char *service_in, DATA_BLOB password,
1248 const char *pdev, uint16 vuid,
1249 NTSTATUS *status)
1250 {
1251 uid_t euid;
1252 user_struct *vuser = NULL;
1253 fstring service;
1254 fstring dev;
1255 int snum = -1;
1256 char addr[INET6_ADDRSTRLEN];
1257
1258 fstrcpy(dev, pdev);
1259
1260 /* This must ONLY BE CALLED AS ROOT. As it exits this function as
1261 * root. */
1262 if (!non_root_mode() && (euid = geteuid()) != 0) {
1263 DEBUG(0,("make_connection: PANIC ERROR. Called as nonroot "
1264 "(%u)\n", (unsigned int)euid ));
1265 smb_panic("make_connection: PANIC ERROR. Called as nonroot\n");
1266 }
1267
1268 if (conn_num_open() > 2047) {
1269 *status = NT_STATUS_INSUFF_SERVER_RESOURCES;
1270 return NULL;
1271 }
1272
1273 if(lp_security() != SEC_SHARE) {
1274 vuser = get_valid_user_struct(vuid);
1275 if (!vuser) {
1276 DEBUG(1,("make_connection: refusing to connect with "
1277 "no session setup\n"));
1278 *status = NT_STATUS_ACCESS_DENIED;
1279 return NULL;
1280 }
1281 }
1282
1283 /* Logic to try and connect to the correct [homes] share, preferably
1284 without too many getpwnam() lookups. This is particulary nasty for
1285 winbind usernames, where the share name isn't the same as unix
1286 username.
1287
1288 The snum of the homes share is stored on the vuser at session setup
1289 time.
1290 */
1291
1292 if (strequal(service_in,HOMES_NAME)) {
1293 if(lp_security() != SEC_SHARE) {
1294 DATA_BLOB no_pw = data_blob_null;
1295 if (vuser->homes_snum == -1) {
1296 DEBUG(2, ("[homes] share not available for "
1297 "this user because it was not found "
1298 "or created at session setup "
1299 "time\n"));
1300 *status = NT_STATUS_BAD_NETWORK_NAME;
1301 return NULL;
1302 }
1303 DEBUG(5, ("making a connection to [homes] service "
1304 "created at session setup time\n"));
1305 return make_connection_snum(vuser->homes_snum,
1306 vuser, no_pw,
1307 dev, status);
1308 } else {
1309 /* Security = share. Try with
1310 * current_user_info.smb_name as the username. */
1311 if (*current_user_info.smb_name) {
1312 fstring unix_username;
1313 fstrcpy(unix_username,
1314 current_user_info.smb_name);
1315 map_username(unix_username);
1316 snum = find_service(unix_username);
1317 }
1318 if (snum != -1) {
1319 DEBUG(5, ("making a connection to 'homes' "
1320 "service %s based on "
1321 "security=share\n", service_in));
1322 return make_connection_snum(snum, NULL,
1323 password,
1324 dev, status);
1325 }
1326 }
1327 } else if ((lp_security() != SEC_SHARE) && (vuser->homes_snum != -1)
1328 && strequal(service_in,
1329 lp_servicename(vuser->homes_snum))) {
1330 DATA_BLOB no_pw = data_blob_null;
1331 DEBUG(5, ("making a connection to 'homes' service [%s] "
1332 "created at session setup time\n", service_in));
1333 return make_connection_snum(vuser->homes_snum,
1334 vuser, no_pw,
1335 dev, status);
1336 }
1337
1338 fstrcpy(service, service_in);
1339
1340 strlower_m(service);
1341
1342 snum = find_service(service);
1343
1344 if (snum < 0) {
1345 if (strequal(service,"IPC$") ||
1346 (lp_enable_asu_support() && strequal(service,"ADMIN$"))) {
1347 DEBUG(3,("refusing IPC connection to %s\n", service));
1348 *status = NT_STATUS_ACCESS_DENIED;
1349 return NULL;
1350 }
1351
1352 DEBUG(0,("%s (%s) couldn't find service %s\n",
1353 get_remote_machine_name(),
1354 client_addr(get_client_fd(),addr,sizeof(addr)),
1355 service));
1356 *status = NT_STATUS_BAD_NETWORK_NAME;
1357 return NULL;
1358 }
1359
1360 /* Handle non-Dfs clients attempting connections to msdfs proxy */
1361 if (lp_host_msdfs() && (*lp_msdfs_proxy(snum) != '\0')) {
1362 DEBUG(3, ("refusing connection to dfs proxy share '%s' "
1363 "(pointing to %s)\n",
1364 service, lp_msdfs_proxy(snum)));
1365 *status = NT_STATUS_BAD_NETWORK_NAME;
1366 return NULL;
1367 }
1368
1369 DEBUG(5, ("making a connection to 'normal' service %s\n", service));
1370
1371 return make_connection_snum(snum, vuser,
1372 password,
1373 dev, status);
1374 }
1375
1376 /****************************************************************************
1377 Close a cnum.
1378 ****************************************************************************/
1379
1380 void close_cnum(connection_struct *conn, uint16 vuid)
1381 {
1382 if (IS_IPC(conn)) {
1383 pipe_close_conn(conn);
1384 } else {
1385 file_close_conn(conn);
1386 dptr_closecnum(conn);
1387 }
1388
1389 change_to_root_user();
1390
1391 DEBUG(IS_IPC(conn)?3:1, ("%s (%s) closed connection to service %s\n",
1392 get_remote_machine_name(),
1393 conn->client_address,
1394 lp_servicename(SNUM(conn))));
1395
1396 /* Call VFS disconnect hook */
1397 SMB_VFS_DISCONNECT(conn);
1398
1399 yield_connection(conn, lp_servicename(SNUM(conn)));
1400
1401 /* make sure we leave the directory available for unmount */
1402 vfs_ChDir(conn, "/");
1403
1404 /* execute any "postexec = " line */
1405 if (*lp_postexec(SNUM(conn)) &&
1406 change_to_user(conn, vuid)) {
1407 char *cmd = talloc_sub_advanced(talloc_tos(),
1408 lp_servicename(SNUM(conn)), conn->user,
1409 conn->connectpath, conn->gid,
1410 get_current_username(),
1411 current_user_info.domain,
1412 lp_postexec(SNUM(conn)));
1413 smbrun(cmd,NULL);
1414 TALLOC_FREE(cmd);
1415 change_to_root_user();
1416 }
1417
1418 change_to_root_user();
1419 /* execute any "root postexec = " line */
1420 if (*lp_rootpostexec(SNUM(conn))) {
1421 char *cmd = talloc_sub_advanced(talloc_tos(),
1422 lp_servicename(SNUM(conn)), conn->user,
1423 conn->connectpath, conn->gid,
1424 get_current_username(),
1425 current_user_info.domain,
1426 lp_rootpostexec(SNUM(conn)));
1427 smbrun(cmd,NULL);
1428 TALLOC_FREE(cmd);
1429 }
1430
1431 conn_free(conn);
1432 }