2 Unix SMB/CIFS implementation.
3 service (connection) opening and closing
4 Copyright (C) Andrew Tridgell 1992-1998
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.
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.
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/>.
21 #include "system/filesys.h"
22 #include "../lib/tsocket/tsocket.h"
23 #include "smbd/smbd.h"
24 #include "smbd/globals.h"
25 #include "../librpc/gen_ndr/netlogon.h"
26 #include "../libcli/security/security.h"
27 #include "printing/pcap.h"
28 #include "passdb/lookup_sid.h"
31 extern userdom_struct current_user_info
;
33 static bool canonicalize_connect_path(connection_struct
*conn
)
36 char *resolved_name
= SMB_VFS_REALPATH(conn
,conn
->connectpath
);
40 ret
= set_conn_connectpath(conn
,resolved_name
);
41 SAFE_FREE(resolved_name
);
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 ****************************************************************************/
51 bool set_conn_connectpath(connection_struct
*conn
, const char *connectpath
)
55 const char *s
= connectpath
;
56 bool start_of_name_component
= true;
58 if (connectpath
== NULL
|| connectpath
[0] == '\0') {
62 /* Allocate for strlen + '\0' + possible leading '/' */
63 destname
= (char *)SMB_MALLOC(strlen(connectpath
) + 2);
69 *d
++ = '/'; /* Always start with root. */
73 /* Eat multiple '/' */
77 if ((d
> destname
+ 1) && (*s
!= '\0')) {
80 start_of_name_component
= True
;
84 if (start_of_name_component
) {
85 if ((s
[0] == '.') && (s
[1] == '.') && (s
[2] == '/' || s
[2] == '\0')) {
86 /* Uh oh - "/../" or "/..\0" ! */
88 /* Go past the ../ or .. */
92 s
+= 2; /* Go past the .. */
95 /* If we just added a '/' - delete it */
96 if ((d
> destname
) && (*(d
-1) == '/')) {
101 /* Are we at the start ? Can't go back further if so. */
103 *d
++ = '/'; /* Can't delete root */
106 /* Go back one level... */
107 /* Decrement d first as d points to the *next* char to write into. */
108 for (d
--; d
> destname
; d
--) {
113 /* We're still at the start of a name component, just the previous one. */
115 } else if ((s
[0] == '.') && ((s
[1] == '\0') || s
[1] == '/')) {
116 /* Component of pathname can't be "." only - skip the '.' . */
130 /* Get the size of the next MB character. */
131 next_codepoint(s
,&siz
);
152 start_of_name_component
= false;
156 /* And must not end in '/' */
157 if (d
> destname
+ 1 && (*(d
-1) == '/')) {
161 DEBUG(10,("set_conn_connectpath: service %s, connectpath = %s\n",
162 lp_servicename(SNUM(conn
)), destname
));
164 string_set(&conn
->connectpath
, destname
);
169 /****************************************************************************
170 Load parameters specific to a connection/service.
171 ****************************************************************************/
173 bool set_current_service(connection_struct
*conn
, uint16 flags
, bool do_chdir
)
182 conn
->lastused_count
++;
187 vfs_ChDir(conn
,conn
->connectpath
) != 0 &&
188 vfs_ChDir(conn
,conn
->origpath
) != 0) {
189 DEBUG(((errno
!=EACCES
)?0:3),("chdir (%s) failed, reason: %s\n",
190 conn
->connectpath
, strerror(errno
)));
194 if ((conn
== last_conn
) && (last_flags
== flags
)) {
201 /* Obey the client case sensitivity requests - only for clients that support it. */
202 switch (lp_casesensitive(snum
)) {
205 /* We need this uglyness due to DOS/Win9x clients that lie about case insensitivity. */
206 enum remote_arch_types ra_type
= get_remote_arch();
207 if ((ra_type
!= RA_SAMBA
) && (ra_type
!= RA_CIFSFS
)) {
208 /* Client can't support per-packet case sensitive pathnames. */
209 conn
->case_sensitive
= False
;
211 conn
->case_sensitive
= !(flags
& FLAG_CASELESS_PATHNAMES
);
216 conn
->case_sensitive
= True
;
219 conn
->case_sensitive
= False
;
225 static int load_registry_service(const char *servicename
)
227 if (!lp_registry_shares()) {
231 if ((servicename
== NULL
) || (*servicename
== '\0')) {
235 if (strequal(servicename
, GLOBAL_NAME
)) {
239 if (!process_registry_service(servicename
)) {
243 return lp_servicenumber(servicename
);
246 void load_registry_shares(void)
248 DEBUG(8, ("load_registry_shares()\n"));
249 if (!lp_registry_shares()) {
253 process_registry_shares();
258 /****************************************************************************
259 Add a home service. Returns the new service number or -1 if fail.
260 ****************************************************************************/
262 int add_home_service(const char *service
, const char *username
, const char *homedir
)
266 if (!service
|| !homedir
|| homedir
[0] == '\0')
269 if ((iHomeService
= lp_servicenumber(HOMES_NAME
)) < 0) {
270 if ((iHomeService
= load_registry_service(HOMES_NAME
)) < 0) {
276 * If this is a winbindd provided username, remove
277 * the domain component before adding the service.
278 * Log a warning if the "path=" parameter does not
279 * include any macros.
283 const char *p
= strchr(service
,*lp_winbind_separator());
285 /* We only want the 'user' part of the string */
291 if (!lp_add_home(service
, iHomeService
, username
, homedir
)) {
295 return lp_servicenumber(service
);
300 * Find a service entry.
302 * @param service is modified (to canonical form??)
305 int find_service(TALLOC_CTX
*ctx
, const char *service_in
, char **p_service_out
)
313 /* First make a copy. */
314 *p_service_out
= talloc_strdup(ctx
, service_in
);
315 if (!*p_service_out
) {
319 all_string_sub(*p_service_out
,"\\","/",0);
321 iService
= lp_servicenumber(*p_service_out
);
323 /* now handle the special case of a home directory */
325 char *phome_dir
= get_user_home_dir(ctx
, *p_service_out
);
329 * Try mapping the servicename, it may
330 * be a Windows to unix mapped user name.
332 if(map_username(ctx
, *p_service_out
, p_service_out
)) {
333 if (*p_service_out
== NULL
) {
337 phome_dir
= get_user_home_dir(
338 ctx
, *p_service_out
);
342 DEBUG(3,("checking for home directory %s gave %s\n",*p_service_out
,
343 phome_dir
?phome_dir
:"(NULL)"));
345 iService
= add_home_service(*p_service_out
,*p_service_out
/* 'username' */, phome_dir
);
348 /* If we still don't have a service, attempt to add it as a printer. */
352 if ((iPrinterService
= lp_servicenumber(PRINTERS_NAME
)) < 0) {
353 iPrinterService
= load_registry_service(PRINTERS_NAME
);
355 if (iPrinterService
>= 0) {
356 DEBUG(3,("checking whether %s is a valid printer name...\n",
358 if (pcap_printername_ok(*p_service_out
)) {
359 DEBUG(3,("%s is a valid printer name\n",
361 DEBUG(3,("adding %s as a printer service\n",
363 lp_add_printer(*p_service_out
, iPrinterService
);
364 iService
= lp_servicenumber(*p_service_out
);
366 DEBUG(0,("failed to add %s as a printer service!\n",
370 DEBUG(3,("%s is not a valid printer name\n",
376 /* Check for default vfs service? Unsure whether to implement this */
381 iService
= load_registry_service(*p_service_out
);
384 /* Is it a usershare service ? */
385 if (iService
< 0 && *lp_usershare_path()) {
386 /* Ensure the name is canonicalized. */
387 strlower_m(*p_service_out
);
388 iService
= load_usershare_service(*p_service_out
);
391 /* just possibly it's a default service? */
393 char *pdefservice
= lp_defaultservice();
396 !strequal(pdefservice
, *p_service_out
)
397 && !strstr_m(*p_service_out
,"..")) {
399 * We need to do a local copy here as lp_defaultservice()
400 * returns one of the rotating lp_string buffers that
401 * could get overwritten by the recursive find_service() call
402 * below. Fix from Josef Hinteregger <joehtg@joehtg.co.at>.
404 char *defservice
= talloc_strdup(ctx
, pdefservice
);
410 /* Disallow anything except explicit share names. */
411 if (strequal(defservice
,HOMES_NAME
) ||
412 strequal(defservice
, PRINTERS_NAME
) ||
413 strequal(defservice
, "IPC$")) {
414 TALLOC_FREE(defservice
);
418 iService
= find_service(ctx
, defservice
, p_service_out
);
419 if (!*p_service_out
) {
420 TALLOC_FREE(defservice
);
425 all_string_sub(*p_service_out
, "_","/",0);
426 iService
= lp_add_service(*p_service_out
, iService
);
428 TALLOC_FREE(defservice
);
433 if (!VALID_SNUM(iService
)) {
434 DEBUG(0,("Invalid snum %d for %s\n",iService
,
443 DEBUG(3,("find_service() failed to find service %s\n",
451 /****************************************************************************
452 do some basic sainity checks on the share.
453 This function modifies dev, ecode.
454 ****************************************************************************/
456 static NTSTATUS
share_sanity_checks(struct client_address
*client_id
, int snum
,
459 if (!lp_snum_ok(snum
) ||
460 !allow_access(lp_hostsdeny(snum
), lp_hostsallow(snum
),
461 client_id
->name
, client_id
->addr
)) {
462 return NT_STATUS_ACCESS_DENIED
;
465 if (dev
[0] == '?' || !dev
[0]) {
466 if (lp_print_ok(snum
)) {
467 fstrcpy(dev
,"LPT1:");
468 } else if (strequal(lp_fstype(snum
), "IPC")) {
477 if (lp_print_ok(snum
)) {
478 if (!strequal(dev
, "LPT1:")) {
479 return NT_STATUS_BAD_DEVICE_TYPE
;
481 } else if (strequal(lp_fstype(snum
), "IPC")) {
482 if (!strequal(dev
, "IPC")) {
483 return NT_STATUS_BAD_DEVICE_TYPE
;
485 } else if (!strequal(dev
, "A:")) {
486 return NT_STATUS_BAD_DEVICE_TYPE
;
489 /* Behave as a printer if we are supposed to */
490 if (lp_print_ok(snum
) && (strcmp(dev
, "A:") == 0)) {
491 fstrcpy(dev
, "LPT1:");
498 * Go through lookup_name etc to find the force'd group.
500 * Create a new token from src_token, replacing the primary group sid with the
504 static NTSTATUS
find_forced_group(bool force_user
,
505 int snum
, const char *username
,
506 struct dom_sid
*pgroup_sid
,
509 NTSTATUS result
= NT_STATUS_NO_SUCH_GROUP
;
510 TALLOC_CTX
*frame
= talloc_stackframe();
511 struct dom_sid group_sid
;
512 enum lsa_SidType type
;
514 bool user_must_be_member
= False
;
517 groupname
= talloc_strdup(talloc_tos(), lp_force_group(snum
));
518 if (groupname
== NULL
) {
519 DEBUG(1, ("talloc_strdup failed\n"));
520 result
= NT_STATUS_NO_MEMORY
;
524 if (groupname
[0] == '+') {
525 user_must_be_member
= True
;
529 groupname
= talloc_string_sub(talloc_tos(), groupname
,
530 "%S", lp_servicename(snum
));
531 if (groupname
== NULL
) {
532 DEBUG(1, ("talloc_string_sub failed\n"));
533 result
= NT_STATUS_NO_MEMORY
;
537 if (!lookup_name_smbconf(talloc_tos(), groupname
,
538 LOOKUP_NAME_ALL
|LOOKUP_NAME_GROUP
,
539 NULL
, NULL
, &group_sid
, &type
)) {
540 DEBUG(10, ("lookup_name_smbconf(%s) failed\n",
545 if ((type
!= SID_NAME_DOM_GRP
) && (type
!= SID_NAME_ALIAS
) &&
546 (type
!= SID_NAME_WKN_GRP
)) {
547 DEBUG(10, ("%s is a %s, not a group\n", groupname
,
548 sid_type_lookup(type
)));
552 if (!sid_to_gid(&group_sid
, &gid
)) {
553 DEBUG(10, ("sid_to_gid(%s) for %s failed\n",
554 sid_string_dbg(&group_sid
), groupname
));
559 * If the user has been forced and the forced group starts with a '+',
560 * then we only set the group to be the forced group if the forced
561 * user is a member of that group. Otherwise, the meaning of the '+'
565 if (force_user
&& user_must_be_member
) {
566 if (user_in_group_sid(username
, &group_sid
)) {
567 sid_copy(pgroup_sid
, &group_sid
);
569 DEBUG(3,("Forced group %s for member %s\n",
570 groupname
, username
));
572 DEBUG(0,("find_forced_group: forced user %s is not a member "
573 "of forced group %s. Disallowing access.\n",
574 username
, groupname
));
575 result
= NT_STATUS_MEMBER_NOT_IN_GROUP
;
579 sid_copy(pgroup_sid
, &group_sid
);
581 DEBUG(3,("Forced group %s\n", groupname
));
584 result
= NT_STATUS_OK
;
590 /****************************************************************************
591 Create an auth_serversupplied_info structure for a connection_struct
592 ****************************************************************************/
594 static NTSTATUS
create_connection_session_info(struct smbd_server_connection
*sconn
,
595 TALLOC_CTX
*mem_ctx
, int snum
,
596 struct auth_serversupplied_info
*vuid_serverinfo
,
598 struct auth_serversupplied_info
**presult
)
600 if (lp_guest_only(snum
)) {
601 return make_server_info_guest(mem_ctx
, presult
);
604 if (vuid_serverinfo
!= NULL
) {
606 struct auth_serversupplied_info
*result
;
609 * This is the normal security != share case where we have a
610 * valid vuid from the session setup. */
612 if (vuid_serverinfo
->guest
) {
613 if (!lp_guest_ok(snum
)) {
614 DEBUG(2, ("guest user (from session setup) "
615 "not permitted to access this share "
616 "(%s)\n", lp_servicename(snum
)));
617 return NT_STATUS_ACCESS_DENIED
;
620 if (!user_ok_token(vuid_serverinfo
->unix_name
,
621 vuid_serverinfo
->info3
->base
.domain
.string
,
622 vuid_serverinfo
->security_token
, snum
)) {
623 DEBUG(2, ("user '%s' (from session setup) not "
624 "permitted to access this share "
626 vuid_serverinfo
->unix_name
,
627 lp_servicename(snum
)));
628 return NT_STATUS_ACCESS_DENIED
;
632 result
= copy_serverinfo(mem_ctx
, vuid_serverinfo
);
633 if (result
== NULL
) {
634 return NT_STATUS_NO_MEMORY
;
641 if (lp_security() == SEC_SHARE
) {
646 /* add the sharename as a possible user name if we
647 are in share mode security */
649 add_session_user(sconn
, lp_servicename(snum
));
651 /* shall we let them in? */
653 if (!authorise_login(sconn
, snum
,user
,password
,&guest
)) {
654 DEBUG( 2, ( "Invalid username/password for [%s]\n",
655 lp_servicename(snum
)) );
656 return NT_STATUS_WRONG_PASSWORD
;
659 return make_serverinfo_from_username(mem_ctx
, user
, guest
,
663 DEBUG(0, ("invalid VUID (vuser) but not in security=share\n"));
664 return NT_STATUS_ACCESS_DENIED
;
667 /****************************************************************************
668 set relavent user and group settings corresponding to force user/group
669 configuration for the given snum.
670 ****************************************************************************/
672 NTSTATUS
set_conn_force_user_group(connection_struct
*conn
, int snum
)
676 if (*lp_force_user(snum
)) {
679 * Replace conn->session_info with a completely faked up one
680 * from the username we are forced into :-)
684 struct auth_serversupplied_info
*forced_serverinfo
;
686 fuser
= talloc_string_sub(conn
, lp_force_user(snum
), "%S",
687 lp_const_servicename(snum
));
689 return NT_STATUS_NO_MEMORY
;
692 status
= make_serverinfo_from_username(
693 conn
, fuser
, conn
->session_info
->guest
,
695 if (!NT_STATUS_IS_OK(status
)) {
699 TALLOC_FREE(conn
->session_info
);
700 conn
->session_info
= forced_serverinfo
;
702 conn
->force_user
= true;
703 DEBUG(3,("Forced user %s\n", fuser
));
707 * If force group is true, then override
708 * any groupid stored for the connecting user.
711 if (*lp_force_group(snum
)) {
713 status
= find_forced_group(
714 conn
->force_user
, snum
, conn
->session_info
->unix_name
,
715 &conn
->session_info
->security_token
->sids
[1],
716 &conn
->session_info
->utok
.gid
);
718 if (!NT_STATUS_IS_OK(status
)) {
723 * We need to cache this gid, to use within
724 * change_to_user() separately from the conn->session_info
725 * struct. We only use conn->session_info directly if
726 * "force_user" was set.
728 conn
->force_group_gid
= conn
->session_info
->utok
.gid
;
734 /****************************************************************************
735 Make a connection, given the snum to connect to, and the vuser of the
736 connecting user if appropriate.
737 ****************************************************************************/
739 static connection_struct
*make_connection_snum(struct smbd_server_connection
*sconn
,
740 connection_struct
*conn
,
741 int snum
, user_struct
*vuser
,
746 struct smb_filename
*smb_fname_cpath
= NULL
;
749 bool on_err_call_dis_hook
= false;
750 bool claimed_connection
= false;
757 *pstatus
= share_sanity_checks(&sconn
->client_id
, snum
, dev
);
758 if (NT_STATUS_IS_ERR(*pstatus
)) {
762 conn
->params
->service
= snum
;
764 status
= create_connection_session_info(sconn
,
765 conn
, snum
, vuser
? vuser
->session_info
: NULL
, password
,
766 &conn
->session_info
);
768 if (!NT_STATUS_IS_OK(status
)) {
769 DEBUG(1, ("create_connection_session_info failed: %s\n",
775 if ((lp_guest_only(snum
)) || (lp_security() == SEC_SHARE
)) {
776 conn
->force_user
= true;
779 add_session_user(sconn
, conn
->session_info
->unix_name
);
781 conn
->num_files_open
= 0;
782 conn
->lastused
= conn
->lastused_count
= time(NULL
);
784 conn
->printer
= (strncmp(dev
,"LPT",3) == 0);
785 conn
->ipc
= ( (strncmp(dev
,"IPC",3) == 0) ||
786 ( lp_enable_asu_support() && strequal(dev
,"ADMIN$")) );
788 /* Case options for the share. */
789 if (lp_casesensitive(snum
) == Auto
) {
790 /* We will be setting this per packet. Set to be case
791 * insensitive for now. */
792 conn
->case_sensitive
= False
;
794 conn
->case_sensitive
= (bool)lp_casesensitive(snum
);
797 conn
->case_preserve
= lp_preservecase(snum
);
798 conn
->short_case_preserve
= lp_shortpreservecase(snum
);
800 conn
->encrypt_level
= lp_smb_encrypt(snum
);
802 conn
->veto_list
= NULL
;
803 conn
->hide_list
= NULL
;
804 conn
->veto_oplock_list
= NULL
;
805 conn
->aio_write_behind_list
= NULL
;
807 conn
->read_only
= lp_readonly(SNUM(conn
));
809 status
= set_conn_force_user_group(conn
, snum
);
810 if (!NT_STATUS_IS_OK(status
)) {
815 conn
->vuid
= (vuser
!= NULL
) ? vuser
->vuid
: UID_FIELD_INVALID
;
818 char *s
= talloc_sub_advanced(talloc_tos(),
819 lp_servicename(SNUM(conn
)),
820 conn
->session_info
->unix_name
,
822 conn
->session_info
->utok
.gid
,
823 conn
->session_info
->sanitized_username
,
824 conn
->session_info
->info3
->base
.domain
.string
,
827 *pstatus
= NT_STATUS_NO_MEMORY
;
831 if (!set_conn_connectpath(conn
,s
)) {
833 *pstatus
= NT_STATUS_NO_MEMORY
;
836 DEBUG(3,("Connect path is '%s' for service [%s]\n",s
,
837 lp_servicename(snum
)));
842 * New code to check if there's a share security descripter
843 * added from NT server manager. This is done after the
844 * smb.conf checks are done as we need a uid and token. JRA.
848 share_access_check(conn
->session_info
->security_token
,
849 lp_servicename(snum
), MAXIMUM_ALLOWED_ACCESS
,
850 &conn
->share_access
);
852 if ((conn
->share_access
& FILE_WRITE_DATA
) == 0) {
853 if ((conn
->share_access
& FILE_READ_DATA
) == 0) {
854 /* No access, read or write. */
855 DEBUG(0,("make_connection: connection to %s "
856 "denied due to security "
858 lp_servicename(snum
)));
859 *pstatus
= NT_STATUS_ACCESS_DENIED
;
862 conn
->read_only
= True
;
865 /* Initialise VFS function pointers */
867 if (!smbd_vfs_init(conn
)) {
868 DEBUG(0, ("vfs_init failed for service %s\n",
869 lp_servicename(snum
)));
870 *pstatus
= NT_STATUS_BAD_NETWORK_NAME
;
874 /* ROOT Activities: */
875 /* explicitly check widelinks here so that we can correctly warn
877 widelinks_warning(snum
);
880 * Enforce the max connections parameter.
883 if ((lp_max_connections(snum
) > 0)
884 && (count_current_connections(lp_servicename(SNUM(conn
)), True
) >=
885 lp_max_connections(snum
))) {
887 DEBUG(1, ("Max connections (%d) exceeded for %s\n",
888 lp_max_connections(snum
), lp_servicename(snum
)));
889 *pstatus
= NT_STATUS_INSUFFICIENT_RESOURCES
;
894 * Get us an entry in the connections db
896 if (!claim_connection(conn
, lp_servicename(snum
))) {
897 DEBUG(1, ("Could not store connections entry\n"));
898 *pstatus
= NT_STATUS_INTERNAL_DB_ERROR
;
901 claimed_connection
= true;
903 /* Invoke VFS make connection hook - this must be the first
904 filesystem operation that we do. */
906 if (SMB_VFS_CONNECT(conn
, lp_servicename(snum
),
907 conn
->session_info
->unix_name
) < 0) {
908 DEBUG(0,("make_connection: VFS make connection failed!\n"));
909 *pstatus
= NT_STATUS_UNSUCCESSFUL
;
913 /* Any error exit after here needs to call the disconnect hook. */
914 on_err_call_dis_hook
= true;
916 if ((!conn
->printer
) && (!conn
->ipc
)) {
917 conn
->notify_ctx
= notify_init(conn
,
918 sconn_server_id(sconn
),
920 smbd_event_context(),
925 * Fix compatibility issue pointed out by Volker.
926 * We pass the conn->connectpath to the preexec
927 * scripts as a parameter, so attempt to canonicalize
928 * it here before calling the preexec scripts.
929 * We ignore errors here, as it is possible that
930 * the conn->connectpath doesn't exist yet and
931 * the preexec scripts will create them.
934 (void)canonicalize_connect_path(conn
);
936 /* Preexecs are done here as they might make the dir we are to ChDir
938 /* execute any "root preexec = " line */
939 if (*lp_rootpreexec(snum
)) {
940 char *cmd
= talloc_sub_advanced(talloc_tos(),
941 lp_servicename(SNUM(conn
)),
942 conn
->session_info
->unix_name
,
944 conn
->session_info
->utok
.gid
,
945 conn
->session_info
->sanitized_username
,
946 conn
->session_info
->info3
->base
.domain
.string
,
947 lp_rootpreexec(snum
));
948 DEBUG(5,("cmd=%s\n",cmd
));
949 ret
= smbrun(cmd
,NULL
);
951 if (ret
!= 0 && lp_rootpreexec_close(snum
)) {
952 DEBUG(1,("root preexec gave %d - failing "
953 "connection\n", ret
));
954 *pstatus
= NT_STATUS_ACCESS_DENIED
;
959 /* USER Activites: */
960 if (!change_to_user(conn
, conn
->vuid
)) {
961 /* No point continuing if they fail the basic checks */
962 DEBUG(0,("Can't become connected user!\n"));
963 *pstatus
= NT_STATUS_LOGON_FAILURE
;
970 /* Remember that a different vuid can connect later without these
973 /* Preexecs are done here as they might make the dir we are to ChDir
976 /* execute any "preexec = " line */
977 if (*lp_preexec(snum
)) {
978 char *cmd
= talloc_sub_advanced(talloc_tos(),
979 lp_servicename(SNUM(conn
)),
980 conn
->session_info
->unix_name
,
982 conn
->session_info
->utok
.gid
,
983 conn
->session_info
->sanitized_username
,
984 conn
->session_info
->info3
->base
.domain
.string
,
986 ret
= smbrun(cmd
,NULL
);
988 if (ret
!= 0 && lp_preexec_close(snum
)) {
989 DEBUG(1,("preexec gave %d - failing connection\n",
991 *pstatus
= NT_STATUS_ACCESS_DENIED
;
996 #ifdef WITH_FAKE_KASERVER
997 if (lp_afs_share(snum
)) {
1003 * we've finished with the user stuff - go back to root
1004 * so the SMB_VFS_STAT call will only fail on path errors,
1005 * not permission problems.
1007 change_to_root_user();
1008 /* ROOT Activites: */
1011 * If widelinks are disallowed we need to canonicalise the connect
1012 * path here to ensure we don't have any symlinks in the
1013 * connectpath. We will be checking all paths on this connection are
1014 * below this directory. We must do this after the VFS init as we
1015 * depend on the realpath() pointer in the vfs table. JRA.
1017 if (!lp_widelinks(snum
)) {
1018 if (!canonicalize_connect_path(conn
)) {
1019 DEBUG(0, ("canonicalize_connect_path failed "
1020 "for service %s, path %s\n",
1021 lp_servicename(snum
),
1022 conn
->connectpath
));
1023 *pstatus
= NT_STATUS_BAD_NETWORK_NAME
;
1028 /* Add veto/hide lists */
1029 if (!IS_IPC(conn
) && !IS_PRINT(conn
)) {
1030 set_namearray( &conn
->veto_list
, lp_veto_files(snum
));
1031 set_namearray( &conn
->hide_list
, lp_hide_files(snum
));
1032 set_namearray( &conn
->veto_oplock_list
, lp_veto_oplocks(snum
));
1033 set_namearray( &conn
->aio_write_behind_list
,
1034 lp_aio_write_behind(snum
));
1036 status
= create_synthetic_smb_fname(talloc_tos(), conn
->connectpath
,
1037 NULL
, NULL
, &smb_fname_cpath
);
1038 if (!NT_STATUS_IS_OK(status
)) {
1043 /* win2000 does not check the permissions on the directory
1044 during the tree connect, instead relying on permission
1045 check during individual operations. To match this behaviour
1046 I have disabled this chdir check (tridge) */
1047 /* the alternative is just to check the directory exists */
1049 if ((ret
= SMB_VFS_STAT(conn
, smb_fname_cpath
)) != 0 ||
1050 !S_ISDIR(smb_fname_cpath
->st
.st_ex_mode
)) {
1051 if (ret
== 0 && !S_ISDIR(smb_fname_cpath
->st
.st_ex_mode
)) {
1052 DEBUG(0,("'%s' is not a directory, when connecting to "
1053 "[%s]\n", conn
->connectpath
,
1054 lp_servicename(snum
)));
1056 DEBUG(0,("'%s' does not exist or permission denied "
1057 "when connecting to [%s] Error was %s\n",
1058 conn
->connectpath
, lp_servicename(snum
),
1061 *pstatus
= NT_STATUS_BAD_NETWORK_NAME
;
1064 conn
->base_share_dev
= smb_fname_cpath
->st
.st_ex_dev
;
1066 string_set(&conn
->origpath
,conn
->connectpath
);
1068 /* Figure out the characteristics of the underlying filesystem. This
1069 * assumes that all the filesystem mounted withing a share path have
1070 * the same characteristics, which is likely but not guaranteed.
1073 conn
->fs_capabilities
= SMB_VFS_FS_CAPABILITIES(conn
, &conn
->ts_res
);
1076 * Print out the 'connected as' stuff here as we need
1077 * to know the effective uid and gid we will be using
1078 * (at least initially).
1081 if( DEBUGLVL( IS_IPC(conn
) ? 3 : 1 ) ) {
1082 dbgtext( "%s (%s) ", get_remote_machine_name(),
1083 conn
->sconn
->client_id
.addr
);
1084 dbgtext( "%s", srv_is_signing_active(sconn
) ? "signed " : "");
1085 dbgtext( "connect to service %s ", lp_servicename(snum
) );
1086 dbgtext( "initially as user %s ",
1087 conn
->session_info
->unix_name
);
1088 dbgtext( "(uid=%d, gid=%d) ", (int)effuid
, (int)effgid
);
1089 dbgtext( "(pid %d)\n", (int)sys_getpid() );
1095 TALLOC_FREE(smb_fname_cpath
);
1096 /* We must exit this function as root. */
1097 if (geteuid() != 0) {
1098 change_to_root_user();
1100 if (on_err_call_dis_hook
) {
1101 /* Call VFS disconnect hook */
1102 SMB_VFS_DISCONNECT(conn
);
1104 if (claimed_connection
) {
1105 yield_connection(conn
, lp_servicename(snum
));
1110 /****************************************************************************
1111 Make a connection to a service from SMB1. Internal interface.
1112 ****************************************************************************/
1114 static connection_struct
*make_connection_smb1(struct smbd_server_connection
*sconn
,
1115 int snum
, user_struct
*vuser
,
1120 connection_struct
*ret_conn
= NULL
;
1121 connection_struct
*conn
= conn_new(sconn
);
1123 DEBUG(0,("make_connection_smb1: Couldn't find free connection.\n"));
1124 *pstatus
= NT_STATUS_INSUFFICIENT_RESOURCES
;
1127 ret_conn
= make_connection_snum(sconn
,
1134 if (ret_conn
!= conn
) {
1141 /****************************************************************************
1142 Make a connection to a service from SMB2. External SMB2 interface.
1143 We must set cnum before claiming connection.
1144 ****************************************************************************/
1146 connection_struct
*make_connection_smb2(struct smbd_server_connection
*sconn
,
1147 struct smbd_smb2_tcon
*tcon
,
1153 connection_struct
*ret_conn
= NULL
;
1154 connection_struct
*conn
= conn_new(sconn
);
1156 DEBUG(0,("make_connection_smb2: Couldn't find free connection.\n"));
1157 *pstatus
= NT_STATUS_INSUFFICIENT_RESOURCES
;
1160 conn
->cnum
= tcon
->tid
;
1161 ret_conn
= make_connection_snum(sconn
,
1168 if (ret_conn
!= conn
) {
1175 /****************************************************************************
1176 Make a connection to a service. External SMB1 interface.
1179 ****************************************************************************/
1181 connection_struct
*make_connection(struct smbd_server_connection
*sconn
,
1182 const char *service_in
, DATA_BLOB password
,
1183 const char *pdev
, uint16 vuid
,
1187 user_struct
*vuser
= NULL
;
1188 char *service
= NULL
;
1194 /* This must ONLY BE CALLED AS ROOT. As it exits this function as
1196 if (!non_root_mode() && (euid
= geteuid()) != 0) {
1197 DEBUG(0,("make_connection: PANIC ERROR. Called as nonroot "
1198 "(%u)\n", (unsigned int)euid
));
1199 smb_panic("make_connection: PANIC ERROR. Called as nonroot\n");
1202 if (conn_num_open(sconn
) > 2047) {
1203 *status
= NT_STATUS_INSUFF_SERVER_RESOURCES
;
1207 if(lp_security() != SEC_SHARE
) {
1208 vuser
= get_valid_user_struct(sconn
, vuid
);
1210 DEBUG(1,("make_connection: refusing to connect with "
1211 "no session setup\n"));
1212 *status
= NT_STATUS_ACCESS_DENIED
;
1217 /* Logic to try and connect to the correct [homes] share, preferably
1218 without too many getpwnam() lookups. This is particulary nasty for
1219 winbind usernames, where the share name isn't the same as unix
1222 The snum of the homes share is stored on the vuser at session setup
1226 if (strequal(service_in
,HOMES_NAME
)) {
1227 if(lp_security() != SEC_SHARE
) {
1228 DATA_BLOB no_pw
= data_blob_null
;
1229 if (vuser
->homes_snum
== -1) {
1230 DEBUG(2, ("[homes] share not available for "
1231 "this user because it was not found "
1232 "or created at session setup "
1234 *status
= NT_STATUS_BAD_NETWORK_NAME
;
1237 DEBUG(5, ("making a connection to [homes] service "
1238 "created at session setup time\n"));
1239 return make_connection_smb1(sconn
,
1244 /* Security = share. Try with
1245 * current_user_info.smb_name as the username. */
1246 if (*current_user_info
.smb_name
) {
1247 char *unix_username
= NULL
;
1248 (void)map_username(talloc_tos(),
1249 current_user_info
.smb_name
,
1251 snum
= find_service(talloc_tos(),
1254 if (!unix_username
) {
1255 *status
= NT_STATUS_NO_MEMORY
;
1260 DEBUG(5, ("making a connection to 'homes' "
1261 "service %s based on "
1262 "security=share\n", service_in
));
1263 return make_connection_smb1(sconn
,
1269 } else if ((lp_security() != SEC_SHARE
) && (vuser
->homes_snum
!= -1)
1270 && strequal(service_in
,
1271 lp_servicename(vuser
->homes_snum
))) {
1272 DATA_BLOB no_pw
= data_blob_null
;
1273 DEBUG(5, ("making a connection to 'homes' service [%s] "
1274 "created at session setup time\n", service_in
));
1275 return make_connection_smb1(sconn
,
1281 service
= talloc_strdup(talloc_tos(), service_in
);
1283 *status
= NT_STATUS_NO_MEMORY
;
1287 strlower_m(service
);
1289 snum
= find_service(talloc_tos(), service
, &service
);
1291 *status
= NT_STATUS_NO_MEMORY
;
1296 if (strequal(service
,"IPC$") ||
1297 (lp_enable_asu_support() && strequal(service
,"ADMIN$"))) {
1298 DEBUG(3,("refusing IPC connection to %s\n", service
));
1299 *status
= NT_STATUS_ACCESS_DENIED
;
1303 DEBUG(3,("%s (%s) couldn't find service %s\n",
1304 get_remote_machine_name(),
1305 tsocket_address_string(
1306 sconn
->remote_address
, talloc_tos()),
1308 *status
= NT_STATUS_BAD_NETWORK_NAME
;
1312 /* Handle non-Dfs clients attempting connections to msdfs proxy */
1313 if (lp_host_msdfs() && (*lp_msdfs_proxy(snum
) != '\0')) {
1314 DEBUG(3, ("refusing connection to dfs proxy share '%s' "
1315 "(pointing to %s)\n",
1316 service
, lp_msdfs_proxy(snum
)));
1317 *status
= NT_STATUS_BAD_NETWORK_NAME
;
1321 DEBUG(5, ("making a connection to 'normal' service %s\n", service
));
1323 return make_connection_smb1(sconn
, snum
, vuser
,
1328 /****************************************************************************
1330 ****************************************************************************/
1332 void close_cnum(connection_struct
*conn
, uint16 vuid
)
1334 file_close_conn(conn
);
1336 if (!IS_IPC(conn
)) {
1337 dptr_closecnum(conn
);
1340 change_to_root_user();
1342 DEBUG(IS_IPC(conn
)?3:1, ("%s (%s) closed connection to service %s\n",
1343 get_remote_machine_name(),
1344 conn
->sconn
->client_id
.addr
,
1345 lp_servicename(SNUM(conn
))));
1347 /* Call VFS disconnect hook */
1348 SMB_VFS_DISCONNECT(conn
);
1350 yield_connection(conn
, lp_servicename(SNUM(conn
)));
1352 /* make sure we leave the directory available for unmount */
1353 vfs_ChDir(conn
, "/");
1355 /* execute any "postexec = " line */
1356 if (*lp_postexec(SNUM(conn
)) &&
1357 change_to_user(conn
, vuid
)) {
1358 char *cmd
= talloc_sub_advanced(talloc_tos(),
1359 lp_servicename(SNUM(conn
)),
1360 conn
->session_info
->unix_name
,
1362 conn
->session_info
->utok
.gid
,
1363 conn
->session_info
->sanitized_username
,
1364 conn
->session_info
->info3
->base
.domain
.string
,
1365 lp_postexec(SNUM(conn
)));
1368 change_to_root_user();
1371 change_to_root_user();
1372 /* execute any "root postexec = " line */
1373 if (*lp_rootpostexec(SNUM(conn
))) {
1374 char *cmd
= talloc_sub_advanced(talloc_tos(),
1375 lp_servicename(SNUM(conn
)),
1376 conn
->session_info
->unix_name
,
1378 conn
->session_info
->utok
.gid
,
1379 conn
->session_info
->sanitized_username
,
1380 conn
->session_info
->info3
->base
.domain
.string
,
1381 lp_rootpostexec(SNUM(conn
)));