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0a2910152a
This changes the behaviour for out-of-range queries: The tdb backend (probably all backends) returns NT_STATUS_NONE_MAPPED and does not set the map.status value to ID_UNMAPPED. This means that we did an early error exit, not setting a negative cache value. This makes smbd ask winbind over and over again for out-of-range gids, which can be a performance problem in certain scenarios. The new code makes us fall through to the code setting the negative cache entry in all cases. Signed-off-by: Volker Lendecke <vl@samba.org> Reviewed-by: Michael Adam <obnox@samba.org> Autobuild-User(master): Michael Adam <obnox@samba.org> Autobuild-Date(master): Fri May 3 14:48:35 CEST 2013 on sn-devel-104
243 lines
5.9 KiB
C
243 lines
5.9 KiB
C
/*
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Unix SMB/CIFS implementation.
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ID Mapping
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Copyright (C) Simo Sorce 2003
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Copyright (C) Jeremy Allison 2006
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Copyright (C) Michael Adam 2010
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.*/
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#include "includes.h"
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#include "winbindd.h"
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#include "winbindd_proto.h"
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#include "idmap.h"
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#include "idmap_cache.h"
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#include "../libcli/security/security.h"
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#include "secrets.h"
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#undef DBGC_CLASS
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#define DBGC_CLASS DBGC_IDMAP
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/*****************************************************************
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Returns the SID mapped to the given UID.
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If mapping is not possible returns an error.
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*****************************************************************/
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NTSTATUS idmap_uid_to_sid(const char *domname, struct dom_sid *sid, uid_t uid)
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{
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NTSTATUS ret;
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struct id_map map;
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bool expired;
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DEBUG(10,("idmap_uid_to_sid: uid = [%lu], domain = '%s'\n",
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(unsigned long)uid, domname?domname:"NULL"));
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if (winbindd_use_idmap_cache()
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&& idmap_cache_find_uid2sid(uid, sid, &expired)) {
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DEBUG(10, ("idmap_cache_find_uid2sid found %u%s\n",
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(unsigned int)uid,
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expired ? " (expired)": ""));
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if (expired && idmap_is_online()) {
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DEBUG(10, ("revalidating expired entry\n"));
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goto backend;
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}
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if (is_null_sid(sid)) {
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DEBUG(10, ("Returning negative cache entry\n"));
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return NT_STATUS_NONE_MAPPED;
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}
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DEBUG(10, ("Returning positive cache entry\n"));
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return NT_STATUS_OK;
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}
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backend:
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ZERO_STRUCT(map);
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map.sid = sid;
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map.xid.type = ID_TYPE_UID;
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map.xid.id = uid;
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ret = idmap_backends_unixid_to_sid(domname, &map);
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if ( ! NT_STATUS_IS_OK(ret)) {
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DEBUG(10, ("error mapping uid [%lu]: %s\n", (unsigned long)uid,
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nt_errstr(ret)));
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map.status = ID_UNMAPPED;
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}
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if (map.status != ID_MAPPED) {
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if (winbindd_use_idmap_cache()) {
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struct dom_sid null_sid;
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struct unixid id;
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id.type = ID_TYPE_UID;
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id.id = uid;
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ZERO_STRUCT(null_sid);
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idmap_cache_set_sid2unixid(&null_sid, &id);
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}
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DEBUG(10, ("uid [%lu] not mapped\n", (unsigned long)uid));
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return NT_STATUS_NONE_MAPPED;
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}
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if (winbindd_use_idmap_cache()) {
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idmap_cache_set_sid2unixid(sid, &map.xid);
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}
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return NT_STATUS_OK;
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}
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/*****************************************************************
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Returns SID mapped to the given GID.
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If mapping is not possible returns an error.
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*****************************************************************/
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NTSTATUS idmap_gid_to_sid(const char *domname, struct dom_sid *sid, gid_t gid)
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{
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NTSTATUS ret;
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struct id_map map;
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bool expired;
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DEBUG(10,("idmap_gid_to_sid: gid = [%lu], domain = '%s'\n",
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(unsigned long)gid, domname?domname:"NULL"));
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if (winbindd_use_idmap_cache()
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&& idmap_cache_find_gid2sid(gid, sid, &expired)) {
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DEBUG(10, ("idmap_cache_find_gid2sid found %u%s\n",
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(unsigned int)gid,
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expired ? " (expired)": ""));
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if (expired && idmap_is_online()) {
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DEBUG(10, ("revalidating expired entry\n"));
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goto backend;
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}
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if (is_null_sid(sid)) {
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DEBUG(10, ("Returning negative cache entry\n"));
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return NT_STATUS_NONE_MAPPED;
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}
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DEBUG(10, ("Returning positive cache entry\n"));
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return NT_STATUS_OK;
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}
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backend:
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ZERO_STRUCT(map);
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map.sid = sid;
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map.xid.type = ID_TYPE_GID;
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map.xid.id = gid;
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ret = idmap_backends_unixid_to_sid(domname, &map);
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if ( ! NT_STATUS_IS_OK(ret)) {
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DEBUG(10, ("error mapping gid [%lu]: %s\n", (unsigned long)gid,
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nt_errstr(ret)));
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map.status = ID_UNMAPPED;
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}
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if (map.status != ID_MAPPED) {
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if (winbindd_use_idmap_cache()) {
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struct dom_sid null_sid;
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struct unixid id;
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id.type = ID_TYPE_GID;
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id.id = gid;
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ZERO_STRUCT(null_sid);
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idmap_cache_set_sid2unixid(&null_sid, &id);
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}
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DEBUG(10, ("gid [%lu] not mapped\n", (unsigned long)gid));
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return NT_STATUS_NONE_MAPPED;
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}
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if (winbindd_use_idmap_cache()) {
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idmap_cache_set_sid2unixid(sid, &map.xid);
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}
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return NT_STATUS_OK;
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}
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/**
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* check whether a given unix id is inside the filter range of an idmap domain
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*/
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bool idmap_unix_id_is_in_range(uint32_t id, struct idmap_domain *dom)
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{
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if (id == 0) {
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/* 0 is not an allowed unix id for id mapping */
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return false;
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}
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if ((dom->low_id && (id < dom->low_id)) ||
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(dom->high_id && (id > dom->high_id)))
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{
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return false;
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}
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return true;
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}
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/**
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* Helper for unixids_to_sids: find entry by id in mapping array,
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* search up to IDMAP_AD_MAX_IDS entries
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*/
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struct id_map *idmap_find_map_by_id(struct id_map **maps, enum id_type type,
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uint32_t id)
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{
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int i;
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for (i = 0; i < IDMAP_LDAP_MAX_IDS; i++) {
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if (maps[i] == NULL) { /* end of the run */
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return NULL;
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}
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if ((maps[i]->xid.type == type) && (maps[i]->xid.id == id)) {
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return maps[i];
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}
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}
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return NULL;
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}
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/**
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* Helper for sids_to_unix_ids: find entry by SID in mapping array,
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* search up to IDMAP_AD_MAX_IDS entries
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*/
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struct id_map *idmap_find_map_by_sid(struct id_map **maps, struct dom_sid *sid)
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{
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int i;
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for (i = 0; i < IDMAP_LDAP_MAX_IDS; i++) {
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if (maps[i] == NULL) { /* end of the run */
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return NULL;
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}
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if (dom_sid_equal(maps[i]->sid, sid)) {
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return maps[i];
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}
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}
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return NULL;
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}
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char *idmap_fetch_secret(const char *backend, const char *domain,
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const char *identity)
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{
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char *tmp, *ret;
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int r;
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r = asprintf(&tmp, "IDMAP_%s_%s", backend, domain);
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if (r < 0)
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return NULL;
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/* make sure the key is case insensitive */
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if (!strupper_m(tmp)) {
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SAFE_FREE(tmp);
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return NULL;
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}
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ret = secrets_fetch_generic(tmp, identity);
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SAFE_FREE(tmp);
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return ret;
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}
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