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samba-mirror/source3/winbindd/idmap_tdb.c
Stefan Metzmacher 95b0dac0af winbindd/idmap: apply const to struct idmap_methods pointers
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14539

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>
2020-10-23 03:25:35 +00:00

443 lines
11 KiB
C

/*
Unix SMB/CIFS implementation.
idmap TDB backend
Copyright (C) Tim Potter 2000
Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2003
Copyright (C) Jeremy Allison 2006
Copyright (C) Simo Sorce 2003-2006
Copyright (C) Michael Adam 2009-2010
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 "system/filesys.h"
#include "winbindd.h"
#include "idmap.h"
#include "idmap_rw.h"
#include "idmap_tdb_common.h"
#include "dbwrap/dbwrap.h"
#include "dbwrap/dbwrap_open.h"
#include "../libcli/security/security.h"
#include "util_tdb.h"
#include "lib/util/string_wrappers.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_IDMAP
/* idmap version determines auto-conversion - this is the database
structure version specifier. */
#define IDMAP_VERSION 2
/* High water mark keys */
#define HWM_GROUP "GROUP HWM"
#define HWM_USER "USER HWM"
struct convert_fn_state {
struct db_context *db;
bool failed;
};
/*****************************************************************************
For idmap conversion: convert one record to new format
Ancient versions (eg 2.2.3a) of winbindd_idmap.tdb mapped DOMAINNAME/rid
instead of the SID.
*****************************************************************************/
static int convert_fn(struct db_record *rec, void *private_data)
{
struct winbindd_domain *domain;
char *p;
NTSTATUS status;
struct dom_sid sid;
uint32_t rid;
struct dom_sid_buf keystr;
fstring dom_name;
TDB_DATA key;
TDB_DATA key2;
TDB_DATA value;
struct convert_fn_state *s = (struct convert_fn_state *)private_data;
key = dbwrap_record_get_key(rec);
DEBUG(10,("Converting %s\n", (const char *)key.dptr));
p = strchr((const char *)key.dptr, '/');
if (!p)
return 0;
*p = 0;
fstrcpy(dom_name, (const char *)key.dptr);
*p++ = '/';
domain = find_domain_from_name(dom_name);
if (domain == NULL) {
/* We must delete the old record. */
DEBUG(0,("Unable to find domain %s\n", dom_name ));
DEBUG(0,("deleting record %s\n", (const char *)key.dptr ));
status = dbwrap_record_delete(rec);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Unable to delete record %s:%s\n",
(const char *)key.dptr,
nt_errstr(status)));
s->failed = true;
return -1;
}
return 0;
}
rid = atoi(p);
sid_compose(&sid, &domain->sid, rid);
key2 = string_term_tdb_data(dom_sid_str_buf(&sid, &keystr));
value = dbwrap_record_get_value(rec);
status = dbwrap_store(s->db, key2, value, TDB_INSERT);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("Unable to add record %s:%s\n",
(const char *)key2.dptr,
nt_errstr(status)));
s->failed = true;
return -1;
}
status = dbwrap_store(s->db, value, key2, TDB_REPLACE);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("Unable to update record %s:%s\n",
(const char *)value.dptr,
nt_errstr(status)));
s->failed = true;
return -1;
}
status = dbwrap_record_delete(rec);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("Unable to delete record %s:%s\n",
(const char *)key.dptr,
nt_errstr(status)));
s->failed = true;
return -1;
}
return 0;
}
/*****************************************************************************
Convert the idmap database from an older version.
*****************************************************************************/
static bool idmap_tdb_upgrade(struct idmap_domain *dom, struct db_context *db)
{
int32_t vers;
struct convert_fn_state s;
NTSTATUS status;
status = dbwrap_fetch_int32_bystring(db, "IDMAP_VERSION", &vers);
if (!NT_STATUS_IS_OK(status)) {
vers = -1;
}
if (IREV(vers) == IDMAP_VERSION) {
/* Arrggghh ! Bytereversed - make order independent ! */
/*
* high and low records were created on a
* big endian machine and will need byte-reversing.
*/
int32_t wm;
status = dbwrap_fetch_int32_bystring(db, HWM_USER, &wm);
if (!NT_STATUS_IS_OK(status)) {
wm = -1;
}
if (wm != -1) {
wm = IREV(wm);
} else {
wm = dom->low_id;
}
status = dbwrap_store_int32_bystring(db, HWM_USER, wm);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Unable to byteswap user hwm in idmap "
"database: %s\n", nt_errstr(status)));
return False;
}
status = dbwrap_fetch_int32_bystring(db, HWM_GROUP, &wm);
if (!NT_STATUS_IS_OK(status)) {
wm = -1;
}
if (wm != -1) {
wm = IREV(wm);
} else {
wm = dom->low_id;
}
status = dbwrap_store_int32_bystring(db, HWM_GROUP, wm);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Unable to byteswap group hwm in idmap "
"database: %s\n", nt_errstr(status)));
return False;
}
}
s.db = db;
s.failed = false;
/* the old format stored as DOMAIN/rid - now we store the SID direct */
status = dbwrap_traverse(db, convert_fn, &s, NULL);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Database traverse failed during conversion\n"));
return false;
}
if (s.failed) {
DEBUG(0, ("Problem during conversion\n"));
return False;
}
status = dbwrap_store_int32_bystring(db, "IDMAP_VERSION",
IDMAP_VERSION);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Unable to store idmap version in database: %s\n",
nt_errstr(status)));
return False;
}
return True;
}
static NTSTATUS idmap_tdb_init_hwm(struct idmap_domain *dom)
{
uint32_t low_uid;
uint32_t low_gid;
bool update_uid = false;
bool update_gid = false;
struct idmap_tdb_common_context *ctx;
NTSTATUS status;
ctx = talloc_get_type(dom->private_data,
struct idmap_tdb_common_context);
status = dbwrap_fetch_uint32_bystring(ctx->db, HWM_USER, &low_uid);
if (!NT_STATUS_IS_OK(status) || low_uid < dom->low_id) {
update_uid = true;
}
status = dbwrap_fetch_uint32_bystring(ctx->db, HWM_GROUP, &low_gid);
if (!NT_STATUS_IS_OK(status) || low_gid < dom->low_id) {
update_gid = true;
}
if (!update_uid && !update_gid) {
return NT_STATUS_OK;
}
if (dbwrap_transaction_start(ctx->db) != 0) {
DEBUG(0, ("Unable to start upgrade transaction!\n"));
return NT_STATUS_INTERNAL_DB_ERROR;
}
if (update_uid) {
status = dbwrap_store_uint32_bystring(ctx->db, HWM_USER,
dom->low_id);
if (!NT_STATUS_IS_OK(status)) {
dbwrap_transaction_cancel(ctx->db);
DEBUG(0, ("Unable to initialise user hwm in idmap "
"database: %s\n", nt_errstr(status)));
return NT_STATUS_INTERNAL_DB_ERROR;
}
}
if (update_gid) {
status = dbwrap_store_uint32_bystring(ctx->db, HWM_GROUP,
dom->low_id);
if (!NT_STATUS_IS_OK(status)) {
dbwrap_transaction_cancel(ctx->db);
DEBUG(0, ("Unable to initialise group hwm in idmap "
"database: %s\n", nt_errstr(status)));
return NT_STATUS_INTERNAL_DB_ERROR;
}
}
if (dbwrap_transaction_commit(ctx->db) != 0) {
DEBUG(0, ("Unable to commit upgrade transaction!\n"));
return NT_STATUS_INTERNAL_DB_ERROR;
}
return NT_STATUS_OK;
}
static NTSTATUS idmap_tdb_open_db(struct idmap_domain *dom)
{
NTSTATUS ret;
TALLOC_CTX *mem_ctx;
char *tdbfile = NULL;
struct db_context *db = NULL;
int32_t version;
bool config_error = false;
struct idmap_tdb_common_context *ctx;
ctx = talloc_get_type(dom->private_data,
struct idmap_tdb_common_context);
if (ctx->db) {
/* it is already open */
return NT_STATUS_OK;
}
/* use our own context here */
mem_ctx = talloc_stackframe();
/* use the old database if present */
tdbfile = state_path(talloc_tos(), "winbindd_idmap.tdb");
if (!tdbfile) {
DEBUG(0, ("Out of memory!\n"));
ret = NT_STATUS_NO_MEMORY;
goto done;
}
DEBUG(10,("Opening tdbfile %s\n", tdbfile ));
/* Open idmap repository */
db = db_open(mem_ctx, tdbfile, 0, TDB_DEFAULT, O_RDWR | O_CREAT, 0644,
DBWRAP_LOCK_ORDER_1, DBWRAP_FLAG_NONE);
if (!db) {
DEBUG(0, ("Unable to open idmap database\n"));
ret = NT_STATUS_UNSUCCESSFUL;
goto done;
}
/* check against earlier versions */
ret = dbwrap_fetch_int32_bystring(db, "IDMAP_VERSION", &version);
if (!NT_STATUS_IS_OK(ret)) {
version = -1;
}
if (version != IDMAP_VERSION) {
if (config_error) {
DEBUG(0,("Upgrade of IDMAP_VERSION from %d to %d is not "
"possible with incomplete configuration\n",
version, IDMAP_VERSION));
ret = NT_STATUS_UNSUCCESSFUL;
goto done;
}
if (dbwrap_transaction_start(db) != 0) {
DEBUG(0, ("Unable to start upgrade transaction!\n"));
ret = NT_STATUS_INTERNAL_DB_ERROR;
goto done;
}
if (!idmap_tdb_upgrade(dom, db)) {
dbwrap_transaction_cancel(db);
DEBUG(0, ("Unable to open idmap database, it's in an old format, and upgrade failed!\n"));
ret = NT_STATUS_INTERNAL_DB_ERROR;
goto done;
}
if (dbwrap_transaction_commit(db) != 0) {
DEBUG(0, ("Unable to commit upgrade transaction!\n"));
ret = NT_STATUS_INTERNAL_DB_ERROR;
goto done;
}
}
ctx->db = talloc_move(ctx, &db);
ret = idmap_tdb_init_hwm(dom);
done:
talloc_free(mem_ctx);
return ret;
}
/**********************************************************************
IDMAP MAPPING TDB BACKEND
**********************************************************************/
/*****************************
Initialise idmap database.
*****************************/
static NTSTATUS idmap_tdb_db_init(struct idmap_domain *dom)
{
NTSTATUS ret;
struct idmap_tdb_common_context *ctx;
DEBUG(10, ("idmap_tdb_db_init called for domain '%s'\n", dom->name));
ctx = talloc_zero(dom, struct idmap_tdb_common_context);
if ( ! ctx) {
DEBUG(0, ("Out of memory!\n"));
return NT_STATUS_NO_MEMORY;
}
/* load backend specific configuration here: */
#if 0
if (strequal(dom->name, "*")) {
} else {
}
#endif
ctx->rw_ops = talloc_zero(ctx, struct idmap_rw_ops);
if (ctx->rw_ops == NULL) {
DEBUG(0, ("Out of memory!\n"));
ret = NT_STATUS_NO_MEMORY;
goto failed;
}
ctx->max_id = dom->high_id;
ctx->hwmkey_uid = HWM_USER;
ctx->hwmkey_gid = HWM_GROUP;
ctx->rw_ops->get_new_id = idmap_tdb_common_get_new_id;
ctx->rw_ops->set_mapping = idmap_tdb_common_set_mapping;
dom->private_data = ctx;
ret = idmap_tdb_open_db(dom);
if ( ! NT_STATUS_IS_OK(ret)) {
goto failed;
}
return NT_STATUS_OK;
failed:
talloc_free(ctx);
return ret;
}
static const struct idmap_methods db_methods = {
.init = idmap_tdb_db_init,
.unixids_to_sids = idmap_tdb_common_unixids_to_sids,
.sids_to_unixids = idmap_tdb_common_sids_to_unixids,
.allocate_id = idmap_tdb_common_get_new_id,
};
NTSTATUS idmap_tdb_init(TALLOC_CTX *mem_ctx)
{
DEBUG(10, ("calling idmap_tdb_init\n"));
return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION, "tdb", &db_methods);
}