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/*
* Samba Unix/Linux SMB client library
*
* Copyright (C) Gregor Beck 2011
*
* 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/>.
*/
/**
* @brief Notify smbd about idmap changes
* @file msg_idmap.c
* @author Gregor Beck <gb@sernet.de>
* @date Feb 2011
*
*/
#include "includes.h"
#include "messages.h"
#include "lib/id_cache.h"
#include "include/memcache.h"
#include "idmap_cache.h"
#include "../librpc/gen_ndr/ndr_security.h"
#include "../libcli/security/dom_sid.h"
bool id_cache_ref_parse(const char* str, struct id_cache_ref* id)
{
struct dom_sid sid;
unsigned long ul;
char c, trash;
if (sscanf(str, "%cID %lu%c", &c, &ul, &trash) == 2) {
switch(c) {
case 'G':
id->id.gid = ul;
id->type = GID;
return true;
case 'U':
id->id.uid = ul;
id->type = UID;
return true;
default:
break;
}
} else if (string_to_sid(&sid, str)) {
id->id.sid = sid;
id->type = SID;
return true;
} else if (strncmp(str, "USER ", 5) == 0) {
id->id.name = str + 5;
id->type = USERNAME;
return true;
}
return false;
}
static bool delete_uid_cache(uid_t puid)
{
DATA_BLOB uid = data_blob_const(&puid, sizeof(puid));
DATA_BLOB sid;
if (!memcache_lookup(NULL, UID_SID_CACHE, uid, &sid)) {
DEBUG(3, ("UID %d is not memcached!\n", (int)puid));
return false;
}
DEBUG(3, ("Delete mapping UID %d <-> %s from memcache\n", (int)puid,
sid_string_dbg((struct dom_sid*)sid.data)));
memcache_delete(NULL, SID_UID_CACHE, sid);
memcache_delete(NULL, UID_SID_CACHE, uid);
return true;
}
static bool delete_gid_cache(gid_t pgid)
{
DATA_BLOB gid = data_blob_const(&pgid, sizeof(pgid));
DATA_BLOB sid;
if (!memcache_lookup(NULL, GID_SID_CACHE, gid, &sid)) {
DEBUG(3, ("GID %d is not memcached!\n", (int)pgid));
return false;
}
DEBUG(3, ("Delete mapping GID %d <-> %s from memcache\n", (int)pgid,
sid_string_dbg((struct dom_sid*)sid.data)));
memcache_delete(NULL, SID_GID_CACHE, sid);
memcache_delete(NULL, GID_SID_CACHE, gid);
return true;
}
static bool delete_sid_cache(const struct dom_sid* psid)
{
DATA_BLOB sid = data_blob_const(psid, ndr_size_dom_sid(psid, 0));
DATA_BLOB id;
if (memcache_lookup(NULL, SID_GID_CACHE, sid, &id)) {
DEBUG(3, ("Delete mapping %s <-> GID %d from memcache\n",
sid_string_dbg(psid), *(int*)id.data));
memcache_delete(NULL, SID_GID_CACHE, sid);
memcache_delete(NULL, GID_SID_CACHE, id);
} else if (memcache_lookup(NULL, SID_UID_CACHE, sid, &id)) {
DEBUG(3, ("Delete mapping %s <-> UID %d from memcache\n",
sid_string_dbg(psid), *(int*)id.data));
memcache_delete(NULL, SID_UID_CACHE, sid);
memcache_delete(NULL, UID_SID_CACHE, id);
} else {
DEBUG(3, ("SID %s is not memcached!\n", sid_string_dbg(psid)));
return false;
}
return true;
}
static bool delete_getpwnam_cache(const char *username)
{
DATA_BLOB name = data_blob_string_const_null(username);
DEBUG(6, ("Delete passwd struct for %s from memcache\n",
username));
memcache_delete(NULL, GETPWNAM_CACHE, name);
return true;
}
static void flush_gid_cache(void)
{
DEBUG(3, ("Flush GID <-> SID memcache\n"));
memcache_flush(NULL, SID_GID_CACHE);
memcache_flush(NULL, GID_SID_CACHE);
}
static void flush_uid_cache(void)
{
DEBUG(3, ("Flush UID <-> SID memcache\n"));
memcache_flush(NULL, SID_UID_CACHE);
memcache_flush(NULL, UID_SID_CACHE);
}
static void delete_from_cache(const struct id_cache_ref* id)
{
switch(id->type) {
case UID:
delete_uid_cache(id->id.uid);
idmap_cache_del_uid(id->id.uid);
break;
case GID:
delete_gid_cache(id->id.gid);
idmap_cache_del_gid(id->id.gid);
break;
case SID:
delete_sid_cache(&id->id.sid);
idmap_cache_del_sid(&id->id.sid);
break;
case USERNAME:
delete_getpwnam_cache(id->id.name);
default:
break;
}
}
static void id_cache_flush(struct messaging_context *msg_ctx,
void* private_data,
uint32_t msg_type,
struct server_id server_id,
DATA_BLOB* data)
{
const char *msg = data ? (const char *)data->data : NULL;
if ((msg == NULL) || (msg[0] == '\0')) {
flush_gid_cache();
flush_uid_cache();
} else if (strncmp(msg, "GID", 3)) {
flush_gid_cache();
} else if (strncmp(msg, "UID", 3)) {
flush_uid_cache();
} else {
DEBUG(0, ("Invalid argument: %s\n", msg));
}
}
static void id_cache_delete(struct messaging_context *msg_ctx,
void *private_data,
uint32_t msg_type,
struct server_id server_id,
DATA_BLOB* data)
{
const char *msg = (data && data->data) ? (const char *)data->data : "<NULL>";
struct id_cache_ref id;
if (!id_cache_ref_parse(msg, &id)) {
DEBUG(0, ("Invalid ?ID: %s\n", msg));
return;
}
delete_from_cache(&id);
}
void id_cache_register_msgs(struct messaging_context *ctx)
{
messaging_register(ctx, NULL, ID_CACHE_FLUSH, id_cache_flush);
messaging_register(ctx, NULL, ID_CACHE_DELETE, id_cache_delete);
}
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