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/*
Unix SMB/CIFS implementation.
ID Mapping Cache
Copyright (C) Volker Lendecke 2008
Copyright (C) Simo Sorce 2006
Copyright (C) Rafal Szczesniak 2002
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"
static char *idmap_cache_sidkey(TALLOC_CTX *ctx, const DOM_SID *sid)
{
fstring sidstr;
return talloc_asprintf(ctx, "IDMAP/SID/%s",
sid_to_fstring(sidstr, sid));
}
static char *idmap_cache_idkey(TALLOC_CTX *ctx, const struct unixid *xid)
{
return talloc_asprintf(ctx, "IDMAP/%s/%lu",
(xid->type==ID_TYPE_UID)?"UID":"GID",
(unsigned long)xid->id);
}
NTSTATUS idmap_cache_set(const struct id_map *id)
{
NTSTATUS ret;
time_t timeout = time(NULL) + lp_idmap_cache_time();
char *sidkey;
char *idkey;
/* Don't cache lookups in the S-1-22-{1,2} domain */
if (sid_check_is_in_unix_users(id->sid)
|| sid_check_is_in_unix_groups(id->sid)) {
return NT_STATUS_OK;
}
sidkey = idmap_cache_sidkey(talloc_tos(), id->sid);
if (sidkey == NULL) {
return NT_STATUS_NO_MEMORY;
}
/* use sidkey as the local memory ctx */
idkey = idmap_cache_idkey(sidkey, &id->xid);
if (idkey == NULL) {
ret = NT_STATUS_NO_MEMORY;
goto done;
}
if (!gencache_set(idkey, sidkey, timeout)
|| !gencache_set(sidkey, idkey, timeout)) {
DEBUG(3, ("Failed to store cache entry!\n"));
ret = NT_STATUS_ACCESS_DENIED;
goto done;
}
ret = NT_STATUS_OK;
done:
TALLOC_FREE(sidkey);
return ret;
}
NTSTATUS idmap_cache_set_negative_sid(const struct id_map *id)
{
NTSTATUS ret = NT_STATUS_OK;
char *sidkey;
sidkey = idmap_cache_sidkey(talloc_tos(), id->sid);
if (sidkey == NULL) {
return NT_STATUS_NO_MEMORY;
}
if (!gencache_set(sidkey, "IDMAP/NEGATIVE",
time(NULL) + lp_idmap_negative_cache_time())) {
DEBUG(3, ("Failed to store cache entry!\n"));
ret = NT_STATUS_ACCESS_DENIED;
goto done;
}
done:
TALLOC_FREE(sidkey);
return ret;
}
NTSTATUS idmap_cache_set_negative_id(const struct id_map *id)
{
NTSTATUS ret = NT_STATUS_OK;
char *idkey;
idkey = idmap_cache_idkey(talloc_tos(), &id->xid);
if (idkey == NULL) {
return NT_STATUS_NO_MEMORY;
}
if (!gencache_set(idkey, "IDMAP/NEGATIVE",
time(NULL) + lp_idmap_negative_cache_time())) {
DEBUG(3, ("Failed to store cache entry!\n"));
ret = NT_STATUS_ACCESS_DENIED;
goto done;
}
done:
TALLOC_FREE(idkey);
return ret;
}
/*
* search the cache for the SID an return a mapping if found
*/
bool idmap_cache_map_sid(const struct dom_sid *sid, struct unixid *xid,
bool *mapped, bool *expired)
{
bool ret = false;
time_t timeout;
char *sidkey;
char *value;
char *rem;
sidkey = idmap_cache_sidkey(talloc_tos(), sid);
if (sidkey == NULL) {
DEBUG(0, ("idmap_cache_sidkey failed\n"));
return false;
}
if (!gencache_get(sidkey, &value, &timeout)) {
TALLOC_FREE(sidkey);
return false;
}
if (strcmp(value, "IDMAP/NEGATIVE") == 0) {
*mapped = false;
}
else if (strncmp(value, "IDMAP/UID/", 10) == 0) {
*mapped = true;
xid->type = ID_TYPE_UID;
xid->id = strtol(&value[10], &rem, 10);
if (*rem != '\0') {
goto fail;
}
}
else if (strncmp(value, "IDMAP/GID/", 10) == 0) {
*mapped = true;
xid->type = ID_TYPE_GID;
xid->id = strtol(&value[10], &rem, 10);
if (*rem != '\0') {
goto fail;
}
}
else {
goto fail;
}
*expired = (timeout <= time(NULL));
ret = true;
fail:
if (!ret) {
DEBUG(1, ("Invalid entry %s in cache\n", value));
}
SAFE_FREE(value);
TALLOC_FREE(sidkey);
return ret;
}
/*
* search the cache for the ID an return a mapping if found
*/
bool idmap_cache_map_id(const struct unixid *xid, struct dom_sid *psid,
bool *mapped, bool *expired)
{
bool ret = false;
time_t timeout;
char *idkey;
char *value;
idkey = idmap_cache_idkey(talloc_tos(), xid);
if (idkey == NULL) {
return false;
}
if (!gencache_get(idkey, &value, &timeout)) {
TALLOC_FREE(idkey);
return false;
}
if (strcmp(value, "IDMAP/NEGATIVE") == 0) {
*mapped = false;
}
else if (strncmp(value, "IDMAP/SID/", 10) == 0) {
*mapped = true;
if (!string_to_sid(psid, value+10)) {
goto fail;
}
}
else {
goto fail;
}
ret = true;
fail:
if (!ret) {
DEBUG(1, ("Invalid entry %s in cache\n", value));
}
SAFE_FREE(value);
TALLOC_FREE(idkey);
return ret;
}
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