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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 "memcache.h"
#include "globals.h"
#include "../libcli/security/dom_sid.h"
#include "../librpc/gen_ndr/messaging.h"
#include "../librpc/gen_ndr/ndr_security.h"
#include "idmap_cache.h"
struct id {
union {
uid_t uid;
gid_t gid;
struct dom_sid sid;
} id;
enum {UID, GID, SID} type;
};
static bool parse_id(const char* str, struct id* 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;
}
return false;
}
static bool uid_in_use(const struct user_struct* user, uid_t uid)
{
while (user) {
if (user->session_info && (user->session_info->utok.uid == uid)) {
return true;
}
user = user->next;
}
return false;
}
static bool gid_in_use(const struct user_struct* user, gid_t gid)
{
while (user) {
if (user->session_info != NULL) {
int i;
struct security_unix_token utok = user->session_info->utok;
if (utok.gid == gid) {
return true;
}
for(i=0; i<utok.ngroups; i++) {
if (utok.groups[i] == gid) {
return true;
}
}
}
user = user->next;
}
return false;
}
static bool sid_in_use(const struct user_struct* user, const struct dom_sid* psid)
{
uid_t uid;
gid_t gid;
if (sid_to_gid(psid, &gid)) {
return gid_in_use(user, gid);
} else if (sid_to_uid(psid, &uid)) {
return uid_in_use(user, uid);
}
return false;
}
static bool id_in_use(const struct user_struct* user, const struct id* id)
{
switch(id->type) {
case UID:
return uid_in_use(user, id->id.uid);
case GID:
return gid_in_use(user, id->id.gid);
case SID:
return sid_in_use(user, &id->id.sid);
default:
break;
}
return false;
}
static void delete_from_cache(const struct id* 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;
default:
break;
}
}
static void message_idmap_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;
DEBUG(0, ("Foo: idmap flush cache message(0x%.2x): %s\n", msg_type, msg ? msg : "<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 message_idmap_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>";
bool do_kill = (msg_type == MSG_IDMAP_KILL);
struct user_struct* validated_users = smbd_server_conn->smb1.sessions.validated_users;
struct id id;
DEBUG(0, ("Foo: idmap delete message(0x%.2x): %s\n", msg_type, msg));
if (!parse_id(msg, &id)) {
DEBUG(0, ("Invalid ?ID: %s\n", msg));
return;
}
if( do_kill && id_in_use(validated_users, &id) ) {
exit_server_cleanly(msg);
} else {
delete_from_cache(&id);
}
}
void msg_idmap_register_msgs(struct messaging_context *ctx)
{
messaging_register(ctx, NULL, MSG_IDMAP_FLUSH, message_idmap_flush);
messaging_register(ctx, NULL, MSG_IDMAP_DELETE, message_idmap_delete);
messaging_register(ctx, NULL, MSG_IDMAP_KILL, message_idmap_delete);
}
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