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/*
Unix SMB/CIFS implementation.
ID Mapping
Copyright (C) Simo Sorce 2003
Copyright (C) Jeremy Allison 2006
Copyright (C) Michael Adam 2010
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.*/
#include "includes.h"
#include "winbindd.h"
#include "winbindd_proto.h"
#include "idmap.h"
#include "idmap_cache.h"
#include "../libcli/security/security.h"
#include "secrets.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_IDMAP
/*****************************************************************
Returns the SID mapped to the given UID.
If mapping is not possible returns an error.
*****************************************************************/
NTSTATUS idmap_uid_to_sid(const char *domname, struct dom_sid *sid, uid_t uid)
{
NTSTATUS ret;
struct id_map map;
bool expired;
DEBUG(10,("idmap_uid_to_sid: uid = [%lu], domain = '%s'\n",
(unsigned long)uid, domname?domname:"NULL"));
if (winbindd_use_idmap_cache()
&& idmap_cache_find_uid2sid(uid, sid, &expired)) {
DEBUG(10, ("idmap_cache_find_uid2sid found %u%s\n",
(unsigned int)uid,
expired ? " (expired)": ""));
if (expired && idmap_is_online()) {
DEBUG(10, ("revalidating expired entry\n"));
goto backend;
}
if (is_null_sid(sid)) {
DEBUG(10, ("Returning negative cache entry\n"));
return NT_STATUS_NONE_MAPPED;
}
DEBUG(10, ("Returning positive cache entry\n"));
return NT_STATUS_OK;
}
backend:
ZERO_STRUCT(map);
map.sid = sid;
map.xid.type = ID_TYPE_UID;
map.xid.id = uid;
ret = idmap_backends_unixid_to_sid(domname, &map);
if ( ! NT_STATUS_IS_OK(ret)) {
DEBUG(10, ("error mapping uid [%lu]: %s\n", (unsigned long)uid,
nt_errstr(ret)));
return ret;
}
if (map.status != ID_MAPPED) {
if (winbindd_use_idmap_cache()) {
struct dom_sid null_sid;
struct unixid id;
id.type = ID_TYPE_UID;
id.id = uid;
ZERO_STRUCT(null_sid);
idmap_cache_set_sid2unixid(&null_sid, &id);
}
DEBUG(10, ("uid [%lu] not mapped\n", (unsigned long)uid));
return NT_STATUS_NONE_MAPPED;
}
if (winbindd_use_idmap_cache()) {
idmap_cache_set_sid2unixid(sid, &map.xid);
}
return NT_STATUS_OK;
}
/*****************************************************************
Returns SID mapped to the given GID.
If mapping is not possible returns an error.
*****************************************************************/
NTSTATUS idmap_gid_to_sid(const char *domname, struct dom_sid *sid, gid_t gid)
{
NTSTATUS ret;
struct id_map map;
bool expired;
DEBUG(10,("idmap_gid_to_sid: gid = [%lu], domain = '%s'\n",
(unsigned long)gid, domname?domname:"NULL"));
if (winbindd_use_idmap_cache()
&& idmap_cache_find_gid2sid(gid, sid, &expired)) {
DEBUG(10, ("idmap_cache_find_gid2sid found %u%s\n",
(unsigned int)gid,
expired ? " (expired)": ""));
if (expired && idmap_is_online()) {
DEBUG(10, ("revalidating expired entry\n"));
goto backend;
}
if (is_null_sid(sid)) {
DEBUG(10, ("Returning negative cache entry\n"));
return NT_STATUS_NONE_MAPPED;
}
DEBUG(10, ("Returning positive cache entry\n"));
return NT_STATUS_OK;
}
backend:
ZERO_STRUCT(map);
map.sid = sid;
map.xid.type = ID_TYPE_GID;
map.xid.id = gid;
ret = idmap_backends_unixid_to_sid(domname, &map);
if ( ! NT_STATUS_IS_OK(ret)) {
DEBUG(10, ("error mapping gid [%lu]: %s\n", (unsigned long)gid,
nt_errstr(ret)));
return ret;
}
if (map.status != ID_MAPPED) {
if (winbindd_use_idmap_cache()) {
struct dom_sid null_sid;
struct unixid id;
id.type = ID_TYPE_GID;
id.id = gid;
ZERO_STRUCT(null_sid);
idmap_cache_set_sid2unixid(&null_sid, &id);
}
DEBUG(10, ("gid [%lu] not mapped\n", (unsigned long)gid));
return NT_STATUS_NONE_MAPPED;
}
if (winbindd_use_idmap_cache()) {
idmap_cache_set_sid2unixid(sid, &map.xid);
}
return NT_STATUS_OK;
}
/**
* check whether a given unix id is inside the filter range of an idmap domain
*/
bool idmap_unix_id_is_in_range(uint32_t id, struct idmap_domain *dom)
{
if (id == 0) {
/* 0 is not an allowed unix id for id mapping */
return false;
}
if ((dom->low_id && (id < dom->low_id)) ||
(dom->high_id && (id > dom->high_id)))
{
return false;
}
return true;
}
/**
* Helper for unixids_to_sids: find entry by id in mapping array,
* search up to IDMAP_AD_MAX_IDS entries
*/
struct id_map *idmap_find_map_by_id(struct id_map **maps, enum id_type type,
uint32_t id)
{
int i;
for (i = 0; i < IDMAP_LDAP_MAX_IDS; i++) {
if (maps[i] == NULL) { /* end of the run */
return NULL;
}
if ((maps[i]->xid.type == type) && (maps[i]->xid.id == id)) {
return maps[i];
}
}
return NULL;
}
/**
* Helper for sids_to_unix_ids: find entry by SID in mapping array,
* search up to IDMAP_AD_MAX_IDS entries
*/
struct id_map *idmap_find_map_by_sid(struct id_map **maps, struct dom_sid *sid)
{
int i;
for (i = 0; i < IDMAP_LDAP_MAX_IDS; i++) {
if (maps[i] == NULL) { /* end of the run */
return NULL;
}
if (dom_sid_equal(maps[i]->sid, sid)) {
return maps[i];
}
}
return NULL;
}
char *idmap_fetch_secret(const char *backend, const char *domain,
const char *identity)
{
char *tmp, *ret;
int r;
r = asprintf(&tmp, "IDMAP_%s_%s", backend, domain);
if (r < 0)
return NULL;
/* make sure the key is case insensitive */
if (!strupper_m(tmp)) {
SAFE_FREE(tmp);
return NULL;
}
ret = secrets_fetch_generic(tmp, identity);
SAFE_FREE(tmp);
return ret;
}
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