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samba-mirror/source3/registry/reg_backend_db.c
Andreas Schneider 6a359944f1 s3:registry: Fix code spelling
Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Joseph Sutton <josephsutton@catalyst.net.nz>
2023-07-19 09:58:37 +00:00

2271 lines
53 KiB
C

/*
* Unix SMB/CIFS implementation.
* Virtual Windows Registry Layer
* Copyright (C) Gerald Carter 2002-2005
* Copyright (C) Michael Adam 2007-2011
* 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/>.
*/
/* Implementation of internal registry database functions. */
#include "includes.h"
#include "system/filesys.h"
#include "registry.h"
#include "reg_db.h"
#include "reg_util_internal.h"
#include "reg_parse_internal.h"
#include "reg_backend_db.h"
#include "reg_objects.h"
#include "nt_printing.h"
#include "util_tdb.h"
#include "dbwrap/dbwrap.h"
#include "dbwrap/dbwrap_open.h"
#include "../libcli/security/secdesc.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_REGISTRY
#define REGDB_VERSION_KEYNAME "INFO/version"
static struct db_context *regdb = NULL;
static int regdb_refcount;
static bool regdb_key_exists(struct db_context *db, const char *key);
static WERROR regdb_fetch_keys_internal(struct db_context *db, const char *key,
struct regsubkey_ctr *ctr);
static bool regdb_store_keys_internal(struct db_context *db, const char *key,
struct regsubkey_ctr *ctr);
static int regdb_fetch_values_internal(struct db_context *db, const char* key,
struct regval_ctr *values);
static NTSTATUS regdb_store_values_internal(struct db_context *db, const char *key,
struct regval_ctr *values);
static WERROR regdb_store_subkey_list(struct db_context *db, const char *parent,
const char *key);
static WERROR regdb_create_basekey(struct db_context *db, const char *key);
static WERROR regdb_create_subkey_internal(struct db_context *db,
const char *key,
const char *subkey);
struct regdb_trans_ctx {
NTSTATUS (*action)(struct db_context *, void *);
void *private_data;
};
static NTSTATUS regdb_trans_do_action(struct db_context *db, void *private_data)
{
NTSTATUS status;
int32_t version_id;
struct regdb_trans_ctx *ctx = (struct regdb_trans_ctx *)private_data;
status = dbwrap_fetch_int32_bystring(db, REGDB_VERSION_KEYNAME,
&version_id);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("ERROR: could not fetch registry db version: %s. "
"Denying access.\n", nt_errstr(status)));
return NT_STATUS_ACCESS_DENIED;
}
if (version_id != REGDB_CODE_VERSION) {
DEBUG(0, ("ERROR: changed registry version %d found while "
"trying to write to the registry. Version %d "
"expected. Denying access.\n",
version_id, REGDB_CODE_VERSION));
return NT_STATUS_ACCESS_DENIED;
}
status = ctx->action(db, ctx->private_data);
return status;
}
static WERROR regdb_trans_do(struct db_context *db,
NTSTATUS (*action)(struct db_context *, void *),
void *private_data)
{
NTSTATUS status;
struct regdb_trans_ctx ctx;
ctx.action = action;
ctx.private_data = private_data;
status = dbwrap_trans_do(db, regdb_trans_do_action, &ctx);
return ntstatus_to_werror(status);
}
/* List the deepest path into the registry. All part components will be created.*/
/* If you want to have a part of the path controlled by the tdb and part by
a virtual registry db (e.g. printing), then you have to list the deepest path.
For example,"HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion/Print"
allows the reg_db backend to handle everything up to
"HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion" and then we'll hook
the reg_printing backend onto the last component of the path (see
KEY_PRINTING_2K in include/rpc_reg.h) --jerry */
static const char *builtin_registry_paths[] = {
KEY_PRINTING_2K,
KEY_PCC,
KEY_PRINTING_PORTS,
KEY_PRINTING,
KEY_PRINTING "\\Forms",
KEY_PRINTING "\\Printers",
KEY_PRINTING "\\Environments\\Windows NT x86\\Print Processors\\winprint",
KEY_PRINTING "\\Environments\\Windows x64\\Print Processors\\winprint",
KEY_SHARES,
KEY_EVENTLOG,
KEY_SMBCONF,
KEY_PERFLIB,
KEY_PERFLIB_009,
KEY_GROUP_POLICY,
KEY_SAMBA_GROUP_POLICY,
KEY_GP_MACHINE_POLICY,
KEY_GP_MACHINE_WIN_POLICY,
KEY_HKCU,
KEY_GP_USER_POLICY,
KEY_GP_USER_WIN_POLICY,
"HKLM\\Software\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon\\GPExtensions",
"HKLM\\SYSTEM\\CurrentControlSet\\Control\\Print\\Monitors",
KEY_PROD_OPTIONS,
"HKLM\\SYSTEM\\CurrentControlSet\\Control\\Terminal Server\\DefaultUserConfiguration",
KEY_TCPIP_PARAMS,
KEY_NETLOGON_PARAMS,
KEY_HKU,
KEY_HKCR,
KEY_HKPD,
KEY_HKPT,
NULL };
struct builtin_regkey_value {
const char *path;
const char *valuename;
uint32_t type;
union {
const char *string;
uint32_t dw_value;
} data;
};
static struct builtin_regkey_value builtin_registry_values[] = {
{ KEY_PRINTING_PORTS,
SAMBA_PRINTER_PORT_NAME, REG_SZ, { "" } },
{ KEY_PRINTING_2K,
"DefaultSpoolDirectory", REG_SZ, { "C:\\Windows\\System32\\Spool\\Printers" } },
{ KEY_EVENTLOG,
"DisplayName", REG_SZ, { "Event Log" } },
{ KEY_EVENTLOG,
"ErrorControl", REG_DWORD, { (char*)0x00000001 } },
{ NULL, NULL, 0, { NULL } }
};
static WERROR create_key_recursive(struct db_context *db,
char *path,
const char *subkey)
{
WERROR werr;
char *p;
if (subkey == NULL) {
return WERR_INVALID_PARAMETER;
}
if (path == NULL) {
return regdb_create_basekey(db, subkey);
}
p = strrchr_m(path, '\\');
if (p == NULL) {
werr = create_key_recursive(db, NULL, path);
} else {
*p = '\0';
werr = create_key_recursive(db, path, p+1);
*p = '\\';
}
if (!W_ERROR_IS_OK(werr)) {
goto done;
}
werr = regdb_create_subkey_internal(db, path, subkey);
done:
return werr;
}
/**
* Initialize a key in the registry:
* create each component key of the specified path.
*/
static WERROR init_registry_key_internal(struct db_context *db,
const char *add_path)
{
char *subkey, *key;
WERROR werr;
TALLOC_CTX *frame = talloc_stackframe();
if (add_path == NULL) {
werr = WERR_INVALID_PARAMETER;
goto done;
}
key = talloc_strdup(frame, add_path);
subkey = strrchr_m(key, '\\');
if (subkey == NULL) {
subkey = key;
key = NULL;
} else {
*subkey = '\0';
subkey++;
}
werr = create_key_recursive(db, key, subkey);
done:
talloc_free(frame);
return werr;
}
struct init_registry_key_context {
const char *add_path;
};
static NTSTATUS init_registry_key_action(struct db_context *db,
void *private_data)
{
struct init_registry_key_context *init_ctx =
(struct init_registry_key_context *)private_data;
return werror_to_ntstatus(init_registry_key_internal(
db, init_ctx->add_path));
}
/**
* Initialize a key in the registry:
* create each component key of the specified path,
* wrapped in one db transaction.
*/
WERROR init_registry_key(const char *add_path)
{
struct init_registry_key_context init_ctx;
if (regdb_key_exists(regdb, add_path)) {
return WERR_OK;
}
init_ctx.add_path = add_path;
return regdb_trans_do(regdb,
init_registry_key_action,
&init_ctx);
}
/***********************************************************************
Open the registry data in the tdb
***********************************************************************/
static void regdb_ctr_add_value(struct regval_ctr *ctr,
struct builtin_regkey_value *value)
{
switch(value->type) {
case REG_DWORD:
regval_ctr_addvalue(ctr, value->valuename, REG_DWORD,
(uint8_t *)&value->data.dw_value,
sizeof(uint32_t));
break;
case REG_SZ:
regval_ctr_addvalue_sz(ctr, value->valuename,
value->data.string);
break;
default:
DEBUG(0, ("regdb_ctr_add_value: invalid value type in "
"registry values [%d]\n", value->type));
}
}
static NTSTATUS init_registry_data_action(struct db_context *db,
void *private_data)
{
NTSTATUS status;
TALLOC_CTX *frame = talloc_stackframe();
struct regval_ctr *values;
int i;
/* loop over all of the predefined paths and add each component */
for (i=0; builtin_registry_paths[i] != NULL; i++) {
if (regdb_key_exists(db, builtin_registry_paths[i])) {
continue;
}
status = werror_to_ntstatus(init_registry_key_internal(db,
builtin_registry_paths[i]));
if (!NT_STATUS_IS_OK(status)) {
goto done;
}
}
/* loop over all of the predefined values and add each component */
for (i=0; builtin_registry_values[i].path != NULL; i++) {
WERROR werr;
werr = regval_ctr_init(frame, &values);
if (!W_ERROR_IS_OK(werr)) {
status = werror_to_ntstatus(werr);
goto done;
}
regdb_fetch_values_internal(db,
builtin_registry_values[i].path,
values);
/* preserve existing values across restarts. Only add new ones */
if (!regval_ctr_value_exists(values,
builtin_registry_values[i].valuename))
{
regdb_ctr_add_value(values,
&builtin_registry_values[i]);
status = regdb_store_values_internal(db,
builtin_registry_values[i].path,
values);
if (!NT_STATUS_IS_OK(status)) {
goto done;
}
}
TALLOC_FREE(values);
}
status = NT_STATUS_OK;
done:
TALLOC_FREE(frame);
return status;
}
WERROR init_registry_data(void)
{
WERROR werr;
TALLOC_CTX *frame = talloc_stackframe();
struct regval_ctr *values;
int i;
/*
* First, check for the existence of the needed keys and values.
* If all do already exist, we can save the writes.
*/
for (i=0; builtin_registry_paths[i] != NULL; i++) {
if (!regdb_key_exists(regdb, builtin_registry_paths[i])) {
goto do_init;
}
}
for (i=0; builtin_registry_values[i].path != NULL; i++) {
werr = regval_ctr_init(frame, &values);
W_ERROR_NOT_OK_GOTO_DONE(werr);
regdb_fetch_values_internal(regdb,
builtin_registry_values[i].path,
values);
if (!regval_ctr_value_exists(values,
builtin_registry_values[i].valuename))
{
TALLOC_FREE(values);
goto do_init;
}
TALLOC_FREE(values);
}
werr = WERR_OK;
goto done;
do_init:
/*
* There are potentially quite a few store operations which are all
* individually wrapped in tdb transactions. Wrapping them in a single
* transaction gives just a single transaction_commit() to actually do
* its fsync()s. See tdb/common/transaction.c for info about nested
* transaction behaviour.
*/
werr = regdb_trans_do(regdb,
init_registry_data_action,
NULL);
done:
TALLOC_FREE(frame);
return werr;
}
static int regdb_normalize_keynames_fn(struct db_record *rec,
void *private_data)
{
TALLOC_CTX *mem_ctx = talloc_tos();
const char *keyname;
NTSTATUS status;
TDB_DATA key;
TDB_DATA value;
struct db_context *db = (struct db_context *)private_data;
key = dbwrap_record_get_key(rec);
if (key.dptr == NULL || key.dsize == 0) {
return 0;
}
value = dbwrap_record_get_value(rec);
if (db == NULL) {
DEBUG(0, ("regdb_normalize_keynames_fn: ERROR: "
"NULL db context handed in via private_data\n"));
return 1;
}
if (strncmp((const char *)key.dptr, REGDB_VERSION_KEYNAME,
strlen(REGDB_VERSION_KEYNAME)) == 0)
{
return 0;
}
keyname = strchr((const char *)key.dptr, '/');
if (keyname) {
keyname = talloc_string_sub(mem_ctx,
(const char *)key.dptr,
"/",
"\\");
DEBUG(2, ("regdb_normalize_keynames_fn: Convert %s to %s\n",
(const char *)key.dptr,
keyname));
/* Delete the original record and store the normalized key */
status = dbwrap_record_delete(rec);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("regdb_normalize_keynames_fn: "
"tdb_delete for [%s] failed!\n",
(const char *)key.dptr));
return 1;
}
status = dbwrap_store_bystring(db, keyname, value, TDB_REPLACE);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("regdb_normalize_keynames_fn: "
"failed to store new record for [%s]!\n",
keyname));
return 1;
}
}
return 0;
}
static WERROR regdb_store_regdb_version(struct db_context *db, uint32_t version)
{
NTSTATUS status;
if (db == NULL) {
return WERR_CAN_NOT_COMPLETE;
}
status = dbwrap_trans_store_int32_bystring(db, REGDB_VERSION_KEYNAME,
version);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("regdb_store_regdb_version: error storing %s = %d: %s\n",
REGDB_VERSION_KEYNAME, version, nt_errstr(status)));
return ntstatus_to_werror(status);
} else {
DEBUG(10, ("regdb_store_regdb_version: stored %s = %d\n",
REGDB_VERSION_KEYNAME, version));
return WERR_OK;
}
}
static WERROR regdb_upgrade_v1_to_v2(struct db_context *db)
{
TALLOC_CTX *mem_ctx;
NTSTATUS status;
WERROR werr;
mem_ctx = talloc_stackframe();
status = dbwrap_traverse(db, regdb_normalize_keynames_fn, db, NULL);
if (!NT_STATUS_IS_OK(status)) {
werr = WERR_REGISTRY_IO_FAILED;
goto done;
}
werr = regdb_store_regdb_version(db, REGDB_VERSION_V2);
done:
talloc_free(mem_ctx);
return werr;
}
static bool tdb_data_read_uint32(TDB_DATA *buf, uint32_t *result)
{
const size_t len = sizeof(uint32_t);
if (buf->dsize >= len) {
*result = IVAL(buf->dptr, 0);
buf->dptr += len;
buf->dsize -= len;
return true;
}
return false;
}
static bool tdb_data_read_cstr(TDB_DATA *buf, char **result)
{
const size_t len = strnlen((char*)buf->dptr, buf->dsize) + 1;
if (buf->dsize >= len) {
*result = (char*)buf->dptr;
buf->dptr += len;
buf->dsize -= len;
return true;
}
return false;
}
static bool tdb_data_is_cstr(TDB_DATA d) {
if (tdb_data_is_empty(d) || (d.dptr[d.dsize-1] != '\0')) {
return false;
}
return strlen((char *)d.dptr) == (d.dsize-1);
}
static bool upgrade_v2_to_v3_check_subkeylist(struct db_context *db,
const char *key,
const char *subkey)
{
static uint32_t zero = 0;
static TDB_DATA empty_subkey_list = {
.dptr = (unsigned char*)&zero,
.dsize = sizeof(uint32_t),
};
bool success = false;
char *path = talloc_asprintf(talloc_tos(), "%s\\%s", key, subkey);
if (!strupper_m(path)) {
goto done;
}
if (!dbwrap_exists(db, string_term_tdb_data(path))) {
NTSTATUS status;
DEBUG(10, ("regdb_upgrade_v2_to_v3: writing subkey list [%s]\n",
path));
status = dbwrap_store_bystring(db, path, empty_subkey_list,
TDB_INSERT);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("regdb_upgrade_v2_to_v3: writing subkey list "
"[%s] failed\n", path));
goto done;
}
}
success = true;
done:
talloc_free(path);
return success;
}
static bool upgrade_v2_to_v3_check_parent(struct db_context *db,
const char *key)
{
const char *sep = strrchr_m(key, '\\');
if (sep != NULL) {
char *pkey = talloc_strndup(talloc_tos(), key, sep-key);
if (!dbwrap_exists(db, string_term_tdb_data(pkey))) {
DEBUG(0, ("regdb_upgrade_v2_to_v3: missing subkey list "
"[%s]\nrun \"net registry check\"\n", pkey));
}
talloc_free(pkey);
}
return true;
}
#define IS_EQUAL(d,s) (((d).dsize == strlen(s)+1) && \
(strcmp((char*)(d).dptr, (s)) == 0))
#define STARTS_WITH(d,s) (((d).dsize > strlen(s)) && \
(strncmp((char*)(d).dptr, (s), strlen(s)) == 0))
#define SSTR(d) (int)(d).dsize , (char*)(d).dptr
static int regdb_upgrade_v2_to_v3_fn(struct db_record *rec, void *private_data)
{
struct db_context *db = (struct db_context *)private_data;
TDB_DATA key = dbwrap_record_get_key(rec);
TDB_DATA val = dbwrap_record_get_value(rec);
if (tdb_data_is_empty(key)) {
return 0;
}
if (db == NULL) {
DEBUG(0, ("regdb_upgrade_v2_to_v3_fn: ERROR: "
"NULL db context handed in via private_data\n"));
return 1;
}
if (IS_EQUAL(key, REGDB_VERSION_KEYNAME) ||
STARTS_WITH(key, REG_VALUE_PREFIX) ||
STARTS_WITH(key, REG_SECDESC_PREFIX))
{
DEBUG(10, ("regdb_upgrade_v2_to_v3: skipping [%.*s]\n",
SSTR(key)));
return 0;
}
if (STARTS_WITH(key, REG_SORTED_SUBKEYS_PREFIX)) {
NTSTATUS status;
/* Delete the deprecated sorted subkeys cache. */
DEBUG(10, ("regdb_upgrade_v2_to_v3: deleting [%.*s]\n",
SSTR(key)));
status = dbwrap_record_delete(rec);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("regdb_upgrade_v2_to_v3: deleting [%.*s] "
"failed!\n", SSTR(key)));
return 1;
}
return 0;
}
if ( tdb_data_is_cstr(key) &&
hive_info((char*)key.dptr) != NULL )
{
/*
* Found a regular subkey list record.
* Walk the list and create the list record for those
* subkeys that don't already have one.
*/
TDB_DATA pos = val;
char *subkey, *path = (char*)key.dptr;
uint32_t num_items, found_items = 0;
DEBUG(10, ("regdb_upgrade_v2_to_v3: scanning subkeylist of "
"[%s]\n", path));
if (!tdb_data_read_uint32(&pos, &num_items)) {
/* invalid or empty - skip */
return 0;
}
while (tdb_data_read_cstr(&pos, &subkey)) {
found_items++;
if (!upgrade_v2_to_v3_check_subkeylist(db, path, subkey))
{
return 1;
}
if (!upgrade_v2_to_v3_check_parent(db, path)) {
return 1;
}
}
if (found_items != num_items) {
DEBUG(0, ("regdb_upgrade_v2_to_v3: inconsistent subkey "
"list [%s]\nrun \"net registry check\"\n",
path));
}
} else {
DEBUG(10, ("regdb_upgrade_v2_to_v3: skipping invalid [%.*s]\n"
"run \"net registry check\"\n", SSTR(key)));
}
return 0;
}
static WERROR regdb_upgrade_v2_to_v3(struct db_context *db)
{
NTSTATUS status;
WERROR werr;
status = dbwrap_traverse(db, regdb_upgrade_v2_to_v3_fn, db, NULL);
if (!NT_STATUS_IS_OK(status)) {
werr = WERR_REGISTRY_IO_FAILED;
goto done;
}
werr = regdb_store_regdb_version(db, REGDB_VERSION_V3);
done:
return werr;
}
/***********************************************************************
Open the registry database
***********************************************************************/
WERROR regdb_init(void)
{
int32_t vers_id;
WERROR werr;
NTSTATUS status;
char *db_path;
if (regdb) {
DEBUG(10, ("regdb_init: incrementing refcount (%d->%d)\n",
regdb_refcount, regdb_refcount+1));
regdb_refcount++;
return WERR_OK;
}
/*
* Clustered Samba can only work as root because we need messaging to
* talk to ctdb which only works as root.
*/
if (!uid_wrapper_enabled() && lp_clustering() && geteuid() != 0) {
DBG_ERR("Cluster mode requires running as root.\n");
return WERR_ACCESS_DENIED;
}
db_path = state_path(talloc_tos(), "registry.tdb");
if (db_path == NULL) {
return WERR_NOT_ENOUGH_MEMORY;
}
regdb = db_open(NULL, db_path, 0,
REG_TDB_FLAGS, O_RDWR, 0600,
DBWRAP_LOCK_ORDER_1, REG_DBWRAP_FLAGS);
if (!regdb) {
regdb = db_open(NULL, db_path, 0,
REG_TDB_FLAGS, O_RDWR|O_CREAT, 0600,
DBWRAP_LOCK_ORDER_1, REG_DBWRAP_FLAGS);
if (!regdb) {
werr = ntstatus_to_werror(map_nt_error_from_unix(errno));
DEBUG(1,("regdb_init: Failed to open registry %s (%s)\n",
db_path, strerror(errno) ));
TALLOC_FREE(db_path);
return werr;
}
werr = regdb_store_regdb_version(regdb, REGDB_CODE_VERSION);
if (!W_ERROR_IS_OK(werr)) {
DEBUG(1, ("regdb_init: Failed to store version: %s\n",
win_errstr(werr)));
TALLOC_FREE(db_path);
return werr;
}
DEBUG(10,("regdb_init: Successfully created registry tdb\n"));
}
TALLOC_FREE(db_path);
regdb_refcount = 1;
DEBUG(10, ("regdb_init: registry db opened. refcount reset (%d)\n",
regdb_refcount));
status = dbwrap_fetch_int32_bystring(regdb, REGDB_VERSION_KEYNAME,
&vers_id);
if (!NT_STATUS_IS_OK(status)) {
DBG_DEBUG("Reading registry version failed: %s, "
"initializing to version %d\n",
nt_errstr(status), REGDB_VERSION_V1);
/*
* There was a regdb format version prior to version 1
* which did not store a INFO/version key. The format
* of this version was identical to version 1 except for
* the lack of the sorted subkey cache records.
* Since these are disposable, we can safely assume version
* 1 if no INFO/version key is found and run the db through
* the whole chain of upgrade. If the database was not
* initialized, this does not harm. If it was the unversioned
* version ("0"), then it do the right thing with the records.
*/
werr = regdb_store_regdb_version(regdb, REGDB_VERSION_V1);
if (!W_ERROR_IS_OK(werr)) {
return werr;
}
vers_id = REGDB_VERSION_V1;
}
if (vers_id == REGDB_CODE_VERSION) {
return WERR_OK;
}
if (vers_id > REGDB_CODE_VERSION || vers_id == 0) {
DEBUG(0, ("regdb_init: unknown registry version %d "
"(code version = %d), refusing initialization\n",
vers_id, REGDB_CODE_VERSION));
return WERR_CAN_NOT_COMPLETE;
}
if (dbwrap_transaction_start(regdb) != 0) {
return WERR_REGISTRY_IO_FAILED;
}
if (vers_id == REGDB_VERSION_V1) {
DEBUG(10, ("regdb_init: upgrading registry from version %d "
"to %d\n", REGDB_VERSION_V1, REGDB_VERSION_V2));
werr = regdb_upgrade_v1_to_v2(regdb);
if (!W_ERROR_IS_OK(werr)) {
dbwrap_transaction_cancel(regdb);
return werr;
}
vers_id = REGDB_VERSION_V2;
}
if (vers_id == REGDB_VERSION_V2) {
DEBUG(10, ("regdb_init: upgrading registry from version %d "
"to %d\n", REGDB_VERSION_V2, REGDB_VERSION_V3));
werr = regdb_upgrade_v2_to_v3(regdb);
if (!W_ERROR_IS_OK(werr)) {
dbwrap_transaction_cancel(regdb);
return werr;
}
vers_id = REGDB_VERSION_V3;
}
/* future upgrade code should go here */
if (dbwrap_transaction_commit(regdb) != 0) {
return WERR_REGISTRY_IO_FAILED;
}
return WERR_OK;
}
/***********************************************************************
Open the registry. Must already have been initialized by regdb_init()
***********************************************************************/
WERROR regdb_open( void )
{
WERROR result;
char *db_path = NULL;
int saved_errno;
if ( regdb ) {
DEBUG(10, ("regdb_open: incrementing refcount (%d->%d)\n",
regdb_refcount, regdb_refcount+1));
regdb_refcount++;
result = WERR_OK;
goto done;
}
db_path = state_path(talloc_tos(), "registry.tdb");
if (db_path == NULL) {
result = WERR_NOT_ENOUGH_MEMORY;
goto done;
}
become_root();
regdb = db_open(NULL, db_path, 0,
REG_TDB_FLAGS, O_RDWR, 0600,
DBWRAP_LOCK_ORDER_1, REG_DBWRAP_FLAGS);
saved_errno = errno;
unbecome_root();
if ( !regdb ) {
result = ntstatus_to_werror(map_nt_error_from_unix(saved_errno));
DEBUG(0,("regdb_open: Failed to open %s! (%s)\n",
db_path, strerror(saved_errno)));
goto done;
}
regdb_refcount = 1;
DEBUG(10, ("regdb_open: registry db opened. refcount reset (%d)\n",
regdb_refcount));
result = WERR_OK;
done:
TALLOC_FREE(db_path);
return result;
}
/***********************************************************************
***********************************************************************/
int regdb_close( void )
{
if (regdb_refcount == 0) {
return 0;
}
regdb_refcount--;
DEBUG(10, ("regdb_close: decrementing refcount (%d->%d)\n",
regdb_refcount+1, regdb_refcount));
if ( regdb_refcount > 0 )
return 0;
SMB_ASSERT( regdb_refcount >= 0 );
TALLOC_FREE(regdb);
return 0;
}
WERROR regdb_transaction_start(void)
{
return (dbwrap_transaction_start(regdb) == 0) ?
WERR_OK : WERR_REGISTRY_IO_FAILED;
}
WERROR regdb_transaction_commit(void)
{
return (dbwrap_transaction_commit(regdb) == 0) ?
WERR_OK : WERR_REGISTRY_IO_FAILED;
}
WERROR regdb_transaction_cancel(void)
{
return (dbwrap_transaction_cancel(regdb) == 0) ?
WERR_OK : WERR_REGISTRY_IO_FAILED;
}
/***********************************************************************
return the tdb sequence number of the registry tdb.
this is an indicator for the content of the registry
having changed. it will change upon regdb_init, too, though.
***********************************************************************/
int regdb_get_seqnum(void)
{
return dbwrap_get_seqnum(regdb);
}
static WERROR regdb_delete_key_with_prefix(struct db_context *db,
const char *keyname,
const char *prefix)
{
char *path;
WERROR werr = WERR_NOT_ENOUGH_MEMORY;
TALLOC_CTX *mem_ctx = talloc_stackframe();
if (keyname == NULL) {
werr = WERR_INVALID_PARAMETER;
goto done;
}
if (prefix == NULL) {
path = discard_const_p(char, keyname);
} else {
path = talloc_asprintf(mem_ctx, "%s\\%s", prefix, keyname);
if (path == NULL) {
goto done;
}
}
path = normalize_reg_path(mem_ctx, path);
if (path == NULL) {
goto done;
}
werr = ntstatus_to_werror(dbwrap_purge_bystring(db, path));
done:
talloc_free(mem_ctx);
return werr;
}
static WERROR regdb_delete_values(struct db_context *db, const char *keyname)
{
return regdb_delete_key_with_prefix(db, keyname, REG_VALUE_PREFIX);
}
static WERROR regdb_delete_secdesc(struct db_context *db, const char *keyname)
{
return regdb_delete_key_with_prefix(db, keyname, REG_SECDESC_PREFIX);
}
static WERROR regdb_delete_subkeylist(struct db_context *db, const char *keyname)
{
return regdb_delete_key_with_prefix(db, keyname, NULL);
}
static WERROR regdb_delete_key_lists(struct db_context *db, const char *keyname)
{
WERROR werr;
werr = regdb_delete_values(db, keyname);
if (!W_ERROR_IS_OK(werr)) {
DEBUG(1, (__location__ " Deleting %s\\%s failed: %s\n",
REG_VALUE_PREFIX, keyname, win_errstr(werr)));
goto done;
}
werr = regdb_delete_secdesc(db, keyname);
if (!W_ERROR_IS_OK(werr)) {
DEBUG(1, (__location__ " Deleting %s\\%s failed: %s\n",
REG_SECDESC_PREFIX, keyname, win_errstr(werr)));
goto done;
}
werr = regdb_delete_subkeylist(db, keyname);
if (!W_ERROR_IS_OK(werr)) {
DEBUG(1, (__location__ " Deleting %s failed: %s\n",
keyname, win_errstr(werr)));
goto done;
}
done:
return werr;
}
/***********************************************************************
Add subkey strings to the registry tdb under a defined key
fmt is the same format as tdb_pack except this function only supports
fstrings
***********************************************************************/
static WERROR regdb_store_keys_internal2(struct db_context *db,
const char *key,
struct regsubkey_ctr *ctr)
{
TDB_DATA dbuf;
uint8_t *buffer = NULL;
uint32_t i = 0;
uint32_t len, buflen;
uint32_t num_subkeys = regsubkey_ctr_numkeys(ctr);
char *keyname = NULL;
TALLOC_CTX *ctx = talloc_stackframe();
WERROR werr;
if (!key) {
werr = WERR_INVALID_PARAMETER;
goto done;
}
keyname = talloc_strdup(ctx, key);
if (!keyname) {
werr = WERR_NOT_ENOUGH_MEMORY;
goto done;
}
keyname = normalize_reg_path(ctx, keyname);
if (!keyname) {
werr = WERR_NOT_ENOUGH_MEMORY;
goto done;
}
/* allocate some initial memory */
buffer = (uint8_t *)SMB_MALLOC(1024);
if (buffer == NULL) {
werr = WERR_NOT_ENOUGH_MEMORY;
goto done;
}
buflen = 1024;
len = 0;
/* store the number of subkeys */
len += tdb_pack(buffer+len, buflen-len, "d", num_subkeys);
/* pack all the strings */
for (i=0; i<num_subkeys; i++) {
size_t thistime;
thistime = tdb_pack(buffer+len, buflen-len, "f",
regsubkey_ctr_specific_key(ctr, i));
if (len+thistime > buflen) {
size_t thistime2;
/*
* tdb_pack hasn't done anything because of the short
* buffer, allocate extra space.
*/
buffer = SMB_REALLOC_ARRAY(buffer, uint8_t,
(len+thistime)*2);
if(buffer == NULL) {
DEBUG(0, ("regdb_store_keys: Failed to realloc "
"memory of size [%u]\n",
(unsigned int)(len+thistime)*2));
werr = WERR_NOT_ENOUGH_MEMORY;
goto done;
}
buflen = (len+thistime)*2;
thistime2 = tdb_pack(
buffer+len, buflen-len, "f",
regsubkey_ctr_specific_key(ctr, i));
if (thistime2 != thistime) {
DEBUG(0, ("tdb_pack failed\n"));
werr = WERR_CAN_NOT_COMPLETE;
goto done;
}
}
len += thistime;
}
/* finally write out the data */
dbuf.dptr = buffer;
dbuf.dsize = len;
werr = ntstatus_to_werror(dbwrap_store_bystring(db, keyname, dbuf,
TDB_REPLACE));
done:
TALLOC_FREE(ctx);
SAFE_FREE(buffer);
return werr;
}
/**
* Utility function to store a new empty list of
* subkeys of given key specified as parent and subkey name
* (thereby creating the key).
* If the parent keyname is NULL, then the "subkey" is
* interpreted as a base key.
* If the subkey list does already exist, it is not modified.
*
* Must be called from within a transaction.
*/
static WERROR regdb_store_subkey_list(struct db_context *db, const char *parent,
const char *key)
{
WERROR werr;
char *path = NULL;
struct regsubkey_ctr *subkeys = NULL;
TALLOC_CTX *frame = talloc_stackframe();
if (parent == NULL) {
path = talloc_strdup(frame, key);
} else {
path = talloc_asprintf(frame, "%s\\%s", parent, key);
}
if (!path) {
werr = WERR_NOT_ENOUGH_MEMORY;
goto done;
}
werr = regsubkey_ctr_init(frame, &subkeys);
W_ERROR_NOT_OK_GOTO_DONE(werr);
werr = regdb_fetch_keys_internal(db, path, subkeys);
if (W_ERROR_IS_OK(werr)) {
/* subkey list exists already - don't modify */
goto done;
}
werr = regsubkey_ctr_reinit(subkeys);
W_ERROR_NOT_OK_GOTO_DONE(werr);
/* create a record with 0 subkeys */
werr = regdb_store_keys_internal2(db, path, subkeys);
if (!W_ERROR_IS_OK(werr)) {
DEBUG(0, ("regdb_store_keys: Failed to store new record for "
"key [%s]: %s\n", path, win_errstr(werr)));
goto done;
}
done:
talloc_free(frame);
return werr;
}
/***********************************************************************
Store the new subkey record and create any child key records that
do not currently exist
***********************************************************************/
struct regdb_store_keys_context {
const char *key;
struct regsubkey_ctr *ctr;
};
static NTSTATUS regdb_store_keys_action(struct db_context *db,
void *private_data)
{
struct regdb_store_keys_context *store_ctx;
WERROR werr;
int num_subkeys, i;
char *path = NULL;
struct regsubkey_ctr *old_subkeys = NULL;
char *oldkeyname = NULL;
TALLOC_CTX *mem_ctx = talloc_stackframe();
store_ctx = (struct regdb_store_keys_context *)private_data;
/*
* Re-fetch the old keys inside the transaction
*/
werr = regsubkey_ctr_init(mem_ctx, &old_subkeys);
W_ERROR_NOT_OK_GOTO_DONE(werr);
werr = regdb_fetch_keys_internal(db, store_ctx->key, old_subkeys);
if (!W_ERROR_IS_OK(werr) &&
!W_ERROR_EQUAL(werr, WERR_NOT_FOUND))
{
goto done;
}
/*
* Make the store operation as safe as possible without transactions:
*
* (1) For each subkey removed from ctr compared with old_subkeys:
*
* (a) First delete the value db entry.
*
* (b) Next delete the secdesc db record.
*
* (c) Then delete the subkey list entry.
*
* (2) Now write the list of subkeys of the parent key,
* deleting removed entries and adding new ones.
*
* (3) Finally create the subkey list entries for the added keys.
*
* This way if we crash half-way in between deleting the subkeys
* and storing the parent's list of subkeys, no old data can pop up
* out of the blue when re-adding keys later on.
*/
/* (1) delete removed keys' lists (values/secdesc/subkeys) */
num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
for (i=0; i<num_subkeys; i++) {
oldkeyname = regsubkey_ctr_specific_key(old_subkeys, i);
if (regsubkey_ctr_key_exists(store_ctx->ctr, oldkeyname)) {
/*
* It's still around, don't delete
*/
continue;
}
path = talloc_asprintf(mem_ctx, "%s\\%s", store_ctx->key,
oldkeyname);
if (!path) {
werr = WERR_NOT_ENOUGH_MEMORY;
goto done;
}
werr = regdb_delete_key_lists(db, path);
W_ERROR_NOT_OK_GOTO_DONE(werr);
TALLOC_FREE(path);
}
TALLOC_FREE(old_subkeys);
/* (2) store the subkey list for the parent */
werr = regdb_store_keys_internal2(db, store_ctx->key, store_ctx->ctr);
if (!W_ERROR_IS_OK(werr)) {
DEBUG(0,("regdb_store_keys: Failed to store new subkey list "
"for parent [%s]: %s\n", store_ctx->key,
win_errstr(werr)));
goto done;
}
/* (3) now create records for any subkeys that don't already exist */
num_subkeys = regsubkey_ctr_numkeys(store_ctx->ctr);
for (i=0; i<num_subkeys; i++) {
const char *subkey;
subkey = regsubkey_ctr_specific_key(store_ctx->ctr, i);
werr = regdb_store_subkey_list(db, store_ctx->key, subkey);
W_ERROR_NOT_OK_GOTO_DONE(werr);
}
/*
* Update the seqnum in the container to possibly
* prevent next read from going to disk
*/
werr = regsubkey_ctr_set_seqnum(store_ctx->ctr, dbwrap_get_seqnum(db));
done:
talloc_free(mem_ctx);
return werror_to_ntstatus(werr);
}
static bool regdb_store_keys_internal(struct db_context *db, const char *key,
struct regsubkey_ctr *ctr)
{
int num_subkeys, old_num_subkeys, i;
struct regsubkey_ctr *old_subkeys = NULL;
TALLOC_CTX *ctx = talloc_stackframe();
WERROR werr;
bool ret = false;
struct regdb_store_keys_context store_ctx;
if (!regdb_key_exists(db, key)) {
goto done;
}
/*
* fetch a list of the old subkeys so we can determine if anything has
* changed
*/
werr = regsubkey_ctr_init(ctx, &old_subkeys);
if (!W_ERROR_IS_OK(werr)) {
DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
goto done;
}
werr = regdb_fetch_keys_internal(db, key, old_subkeys);
if (!W_ERROR_IS_OK(werr) &&
!W_ERROR_EQUAL(werr, WERR_NOT_FOUND))
{
goto done;
}
num_subkeys = regsubkey_ctr_numkeys(ctr);
old_num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
if ((num_subkeys && old_num_subkeys) &&
(num_subkeys == old_num_subkeys)) {
for (i = 0; i < num_subkeys; i++) {
if (strcmp(regsubkey_ctr_specific_key(ctr, i),
regsubkey_ctr_specific_key(old_subkeys, i))
!= 0)
{
break;
}
}
if (i == num_subkeys) {
/*
* Nothing changed, no point to even start a tdb
* transaction
*/
ret = true;
goto done;
}
}
TALLOC_FREE(old_subkeys);
store_ctx.key = key;
store_ctx.ctr = ctr;
werr = regdb_trans_do(db,
regdb_store_keys_action,
&store_ctx);
ret = W_ERROR_IS_OK(werr);
done:
TALLOC_FREE(ctx);
return ret;
}
static bool regdb_store_keys(const char *key, struct regsubkey_ctr *ctr)
{
return regdb_store_keys_internal(regdb, key, ctr);
}
/**
* create a subkey of a given key
*/
struct regdb_create_subkey_context {
const char *key;
const char *subkey;
};
static NTSTATUS regdb_create_subkey_action(struct db_context *db,
void *private_data)
{
WERROR werr;
struct regdb_create_subkey_context *create_ctx;
struct regsubkey_ctr *subkeys;
TALLOC_CTX *mem_ctx = talloc_stackframe();
create_ctx = (struct regdb_create_subkey_context *)private_data;
werr = regsubkey_ctr_init(mem_ctx, &subkeys);
W_ERROR_NOT_OK_GOTO_DONE(werr);
werr = regdb_fetch_keys_internal(db, create_ctx->key, subkeys);
W_ERROR_NOT_OK_GOTO_DONE(werr);
werr = regsubkey_ctr_addkey(subkeys, create_ctx->subkey);
W_ERROR_NOT_OK_GOTO_DONE(werr);
werr = regdb_store_keys_internal2(db, create_ctx->key, subkeys);
if (!W_ERROR_IS_OK(werr)) {
DEBUG(0, (__location__ " failed to store new subkey list for "
"parent key %s: %s\n", create_ctx->key,
win_errstr(werr)));
}
werr = regdb_store_subkey_list(db, create_ctx->key, create_ctx->subkey);
done:
talloc_free(mem_ctx);
return werror_to_ntstatus(werr);
}
static WERROR regdb_create_subkey_internal(struct db_context *db,
const char *key,
const char *subkey)
{
WERROR werr;
struct regsubkey_ctr *subkeys;
TALLOC_CTX *mem_ctx = talloc_stackframe();
struct regdb_create_subkey_context create_ctx;
if (!regdb_key_exists(db, key)) {
werr = WERR_NOT_FOUND;
goto done;
}
werr = regsubkey_ctr_init(mem_ctx, &subkeys);
W_ERROR_NOT_OK_GOTO_DONE(werr);
werr = regdb_fetch_keys_internal(db, key, subkeys);
W_ERROR_NOT_OK_GOTO_DONE(werr);
if (regsubkey_ctr_key_exists(subkeys, subkey)) {
char *newkey;
newkey = talloc_asprintf(mem_ctx, "%s\\%s", key, subkey);
if (newkey == NULL) {
werr = WERR_NOT_ENOUGH_MEMORY;
goto done;
}
if (regdb_key_exists(db, newkey)) {
werr = WERR_OK;
goto done;
}
}
talloc_free(subkeys);
create_ctx.key = key;
create_ctx.subkey = subkey;
werr = regdb_trans_do(db,
regdb_create_subkey_action,
&create_ctx);
done:
talloc_free(mem_ctx);
return werr;
}
static WERROR regdb_create_subkey(const char *key, const char *subkey)
{
return regdb_create_subkey_internal(regdb, key, subkey);
}
/**
* create a base key
*/
struct regdb_create_basekey_context {
const char *key;
};
static NTSTATUS regdb_create_basekey_action(struct db_context *db,
void *private_data)
{
WERROR werr;
struct regdb_create_basekey_context *create_ctx;
create_ctx = (struct regdb_create_basekey_context *)private_data;
werr = regdb_store_subkey_list(db, NULL, create_ctx->key);
return werror_to_ntstatus(werr);
}
static WERROR regdb_create_basekey(struct db_context *db, const char *key)
{
WERROR werr;
struct regdb_create_subkey_context create_ctx;
create_ctx.key = key;
werr = regdb_trans_do(db,
regdb_create_basekey_action,
&create_ctx);
return werr;
}
/**
* create a subkey of a given key
*/
struct regdb_delete_subkey_context {
const char *key;
const char *subkey;
const char *path;
bool lazy;
};
static NTSTATUS regdb_delete_subkey_action(struct db_context *db,
void *private_data)
{
WERROR werr;
struct regdb_delete_subkey_context *delete_ctx;
struct regsubkey_ctr *subkeys;
TALLOC_CTX *mem_ctx = talloc_stackframe();
delete_ctx = (struct regdb_delete_subkey_context *)private_data;
werr = regdb_delete_key_lists(db, delete_ctx->path);
W_ERROR_NOT_OK_GOTO_DONE(werr);
if (delete_ctx->lazy) {
goto done;
}
werr = regsubkey_ctr_init(mem_ctx, &subkeys);
W_ERROR_NOT_OK_GOTO_DONE(werr);
werr = regdb_fetch_keys_internal(db, delete_ctx->key, subkeys);
W_ERROR_NOT_OK_GOTO_DONE(werr);
werr = regsubkey_ctr_delkey(subkeys, delete_ctx->subkey);
W_ERROR_NOT_OK_GOTO_DONE(werr);
werr = regdb_store_keys_internal2(db, delete_ctx->key, subkeys);
if (!W_ERROR_IS_OK(werr)) {
DEBUG(0, (__location__ " failed to store new subkey_list for "
"parent key %s: %s\n", delete_ctx->key,
win_errstr(werr)));
}
done:
talloc_free(mem_ctx);
return werror_to_ntstatus(werr);
}
static WERROR regdb_delete_subkey(const char *key, const char *subkey, bool lazy)
{
WERROR werr;
char *path;
struct regdb_delete_subkey_context delete_ctx;
TALLOC_CTX *mem_ctx = talloc_stackframe();
if (!regdb_key_exists(regdb, key)) {
werr = WERR_NOT_FOUND;
goto done;
}
path = talloc_asprintf(mem_ctx, "%s\\%s", key, subkey);
if (path == NULL) {
werr = WERR_NOT_ENOUGH_MEMORY;
goto done;
}
if (!regdb_key_exists(regdb, path)) {
werr = WERR_OK;
goto done;
}
delete_ctx.key = key;
delete_ctx.subkey = subkey;
delete_ctx.path = path;
delete_ctx.lazy = lazy;
werr = regdb_trans_do(regdb,
regdb_delete_subkey_action,
&delete_ctx);
done:
talloc_free(mem_ctx);
return werr;
}
static TDB_DATA regdb_fetch_key_internal(struct db_context *db,
TALLOC_CTX *mem_ctx, const char *key)
{
char *path = NULL;
TDB_DATA data;
NTSTATUS status;
path = normalize_reg_path(mem_ctx, key);
if (!path) {
return make_tdb_data(NULL, 0);
}
status = dbwrap_fetch_bystring(db, mem_ctx, path, &data);
if (!NT_STATUS_IS_OK(status)) {
data = tdb_null;
}
TALLOC_FREE(path);
return data;
}
/**
* Check for the existence of a key.
*
* Existence of a key is authoritatively defined by
* the existence of the record that contains the list
* of its subkeys.
*
* Return false, if the record does not match the correct
* structure of an initial 4-byte counter and then a
* list of the corresponding number of zero-terminated
* strings.
*/
static bool regdb_key_exists(struct db_context *db, const char *key)
{
TALLOC_CTX *mem_ctx = talloc_stackframe();
TDB_DATA value;
bool ret = false;
char *path;
uint32_t buflen;
const char *buf;
uint32_t num_items, i;
int32_t len;
if (key == NULL) {
goto done;
}
path = normalize_reg_path(mem_ctx, key);
if (path == NULL) {
DEBUG(0, ("out of memory! (talloc failed)\n"));
goto done;
}
if (*path == '\0') {
goto done;
}
value = regdb_fetch_key_internal(db, mem_ctx, path);
if (value.dptr == NULL) {
goto done;
}
if (value.dsize == 0) {
DEBUG(10, ("regdb_key_exists: subkeylist-record for key "
"[%s] is empty: Could be a deleted record in a "
"clustered (ctdb) environment?\n",
path));
goto done;
}
len = tdb_unpack(value.dptr, value.dsize, "d", &num_items);
if (len == (int32_t)-1) {
DEBUG(1, ("regdb_key_exists: ERROR: subkeylist-record for key "
"[%s] is invalid: Could not parse initial 4-byte "
"counter. record data length is %u.\n",
path, (unsigned int)value.dsize));
goto done;
}
/*
* Note: the tdb_unpack check above implies that len <= value.dsize
*/
buflen = value.dsize - len;
buf = (const char *)value.dptr + len;
for (i = 0; i < num_items; i++) {
if (buflen == 0) {
break;
}
len = strnlen(buf, buflen) + 1;
if (buflen < len) {
DEBUG(1, ("regdb_key_exists: ERROR: subkeylist-record "
"for key [%s] is corrupt: %u items expected, "
"item number %u is not zero terminated.\n",
path, num_items, i+1));
goto done;
}
buf += len;
buflen -= len;
}
if (buflen > 0) {
DEBUG(1, ("regdb_key_exists: ERROR: subkeylist-record for key "
"[%s] is corrupt: %u items expected and found, but "
"the record contains additional %u bytes\n",
path, num_items, buflen));
goto done;
}
if (i < num_items) {
DEBUG(1, ("regdb_key_exists: ERROR: subkeylist-record for key "
"[%s] is corrupt: %u items expected, but only %u "
"items found.\n",
path, num_items, i+1));
goto done;
}
ret = true;
done:
TALLOC_FREE(mem_ctx);
return ret;
}
/***********************************************************************
Retrieve an array of strings containing subkeys. Memory should be
released by the caller.
***********************************************************************/
static WERROR regdb_fetch_keys_internal(struct db_context *db, const char *key,
struct regsubkey_ctr *ctr)
{
WERROR werr;
uint32_t num_items;
uint8_t *buf;
uint32_t buflen, len;
uint32_t i;
fstring subkeyname;
TALLOC_CTX *frame = talloc_stackframe();
TDB_DATA value;
int seqnum[2], count;
DEBUG(11,("regdb_fetch_keys: Enter key => [%s]\n", key ? key : "NULL"));
if (!regdb_key_exists(db, key)) {
DEBUG(10, ("key [%s] not found\n", key));
werr = WERR_NOT_FOUND;
goto done;
}
werr = regsubkey_ctr_reinit(ctr);
W_ERROR_NOT_OK_GOTO_DONE(werr);
count = 0;
ZERO_STRUCT(value);
seqnum[0] = dbwrap_get_seqnum(db);
do {
count++;
TALLOC_FREE(value.dptr);
value = regdb_fetch_key_internal(db, frame, key);
seqnum[count % 2] = dbwrap_get_seqnum(db);
} while (seqnum[0] != seqnum[1]);
if (count > 1) {
DEBUG(5, ("regdb_fetch_keys_internal: it took %d attempts to "
"fetch key '%s' with constant seqnum\n",
count, key));
}
werr = regsubkey_ctr_set_seqnum(ctr, seqnum[0]);
if (!W_ERROR_IS_OK(werr)) {
goto done;
}
if (value.dsize == 0 || value.dptr == NULL) {
DEBUG(10, ("regdb_fetch_keys: no subkeys found for key [%s]\n",
key));
goto done;
}
buf = value.dptr;
buflen = value.dsize;
len = tdb_unpack( buf, buflen, "d", &num_items);
if (len == (uint32_t)-1) {
werr = WERR_NOT_FOUND;
goto done;
}
for (i=0; i<num_items; i++) {
int this_len;
this_len = tdb_unpack(buf+len, buflen-len, "f", subkeyname);
if (this_len == -1) {
DBG_WARNING("Invalid registry data, "
"tdb_unpack failed\n");
werr = WERR_INTERNAL_DB_CORRUPTION;
goto done;
}
len += this_len;
if (len < this_len) {
DBG_WARNING("Invalid registry data, "
"integer overflow\n");
werr = WERR_INTERNAL_DB_CORRUPTION;
goto done;
}
werr = regsubkey_ctr_addkey(ctr, subkeyname);
if (!W_ERROR_IS_OK(werr)) {
DEBUG(5, ("regdb_fetch_keys: regsubkey_ctr_addkey "
"failed: %s\n", win_errstr(werr)));
num_items = 0;
goto done;
}
}
DEBUG(11,("regdb_fetch_keys: Exit [%d] items\n", num_items));
done:
TALLOC_FREE(frame);
return werr;
}
static int regdb_fetch_keys(const char *key, struct regsubkey_ctr *ctr)
{
WERROR werr;
werr = regdb_fetch_keys_internal(regdb, key, ctr);
if (!W_ERROR_IS_OK(werr)) {
return -1;
}
return regsubkey_ctr_numkeys(ctr);
}
/****************************************************************************
Unpack a list of registry values frem the TDB
***************************************************************************/
static int regdb_unpack_values(struct regval_ctr *values,
uint8_t *buf,
size_t buflen)
{
int this_len;
size_t len = 0;
uint32_t type;
fstring valuename;
uint32_t size;
uint8_t *data_p;
uint32_t num_values = 0;
uint32_t i;
/* loop and unpack the rest of the registry values */
this_len = tdb_unpack(buf, buflen, "d", &num_values);
if (this_len == -1) {
DBG_WARNING("Invalid registry data, "
"tdb_unpack failed\n");
return -1;
}
len = this_len;
for ( i=0; i<num_values; i++ ) {
/* unpack the next regval */
type = REG_NONE;
size = 0;
data_p = NULL;
valuename[0] = '\0';
this_len = tdb_unpack(buf+len, buflen-len, "fdB",
valuename,
&type,
&size,
&data_p);
if (this_len == -1) {
DBG_WARNING("Invalid registry data, "
"tdb_unpack failed\n");
return -1;
}
len += this_len;
if (len < (size_t)this_len) {
DBG_WARNING("Invalid registry data, "
"integer overflow\n");
return -1;
}
regval_ctr_addvalue(values, valuename, type,
(uint8_t *)data_p, size);
SAFE_FREE(data_p); /* 'B' option to tdb_unpack does a malloc() */
DEBUG(10, ("regdb_unpack_values: value[%d]: name[%s] len[%d]\n",
i, valuename, size));
}
return len;
}
/****************************************************************************
Pack all values in all printer keys
***************************************************************************/
static int regdb_pack_values(struct regval_ctr *values, uint8_t *buf, int buflen)
{
int len = 0;
int i;
struct regval_blob *val;
int num_values;
if ( !values )
return 0;
num_values = regval_ctr_numvals( values );
/* pack the number of values first */
len += tdb_pack( buf+len, buflen-len, "d", num_values );
/* loop over all values */
for ( i=0; i<num_values; i++ ) {
val = regval_ctr_specific_value( values, i );
len += tdb_pack(buf+len, buflen-len, "fdB",
regval_name(val),
regval_type(val),
regval_size(val),
regval_data_p(val) );
}
return len;
}
/***********************************************************************
Retrieve an array of strings containing subkeys. Memory should be
released by the caller.
***********************************************************************/
static int regdb_fetch_values_internal(struct db_context *db, const char* key,
struct regval_ctr *values)
{
char *keystr = NULL;
TALLOC_CTX *ctx = talloc_stackframe();
int ret = 0;
TDB_DATA value;
WERROR werr;
int seqnum[2], count;
DEBUG(10,("regdb_fetch_values: Looking for values of key [%s]\n", key));
if (!regdb_key_exists(db, key)) {
DEBUG(10, ("regb_fetch_values: key [%s] does not exist\n",
key));
ret = -1;
goto done;
}
keystr = talloc_asprintf(ctx, "%s\\%s", REG_VALUE_PREFIX, key);
if (!keystr) {
goto done;
}
ZERO_STRUCT(value);
count = 0;
seqnum[0] = dbwrap_get_seqnum(db);
do {
count++;
TALLOC_FREE(value.dptr);
value = regdb_fetch_key_internal(db, ctx, keystr);
seqnum[count % 2] = dbwrap_get_seqnum(db);
} while (seqnum[0] != seqnum[1]);
if (count > 1) {
DEBUG(5, ("regdb_fetch_values_internal: it took %d attempts "
"to fetch key '%s' with constant seqnum\n",
count, key));
}
werr = regval_ctr_set_seqnum(values, seqnum[0]);
if (!W_ERROR_IS_OK(werr)) {
goto done;
}
if (!value.dptr) {
/* all keys have zero values by default */
goto done;
}
ret = regdb_unpack_values(values, value.dptr, value.dsize);
if (ret == -1) {
DBG_WARNING("regdb_unpack_values failed\n");
}
ret = regval_ctr_numvals(values);
done:
TALLOC_FREE(ctx);
return ret;
}
static int regdb_fetch_values(const char* key, struct regval_ctr *values)
{
return regdb_fetch_values_internal(regdb, key, values);
}
static NTSTATUS regdb_store_values_internal(struct db_context *db,
const char *key,
struct regval_ctr *values)
{
TDB_DATA old_data, data;
char *keystr = NULL;
TALLOC_CTX *ctx = talloc_stackframe();
int len;
NTSTATUS status;
WERROR werr;
DEBUG(10,("regdb_store_values: Looking for values of key [%s]\n", key));
if (!regdb_key_exists(db, key)) {
status = NT_STATUS_NOT_FOUND;
goto done;
}
if (regval_ctr_numvals(values) == 0) {
werr = regdb_delete_values(db, key);
if (!W_ERROR_IS_OK(werr)) {
status = werror_to_ntstatus(werr);
goto done;
}
/*
* update the seqnum in the cache to prevent the next read
* from going to disk
*/
werr = regval_ctr_set_seqnum(values, dbwrap_get_seqnum(db));
status = werror_to_ntstatus(werr);
goto done;
}
ZERO_STRUCT(data);
len = regdb_pack_values(values, data.dptr, data.dsize);
if (len <= 0) {
DEBUG(0,("regdb_store_values: unable to pack values. len <= 0\n"));
status = NT_STATUS_UNSUCCESSFUL;
goto done;
}
data.dptr = talloc_array(ctx, uint8_t, len);
data.dsize = len;
len = regdb_pack_values(values, data.dptr, data.dsize);
SMB_ASSERT( len == data.dsize );
keystr = talloc_asprintf(ctx, "%s\\%s", REG_VALUE_PREFIX, key );
if (!keystr) {
status = NT_STATUS_NO_MEMORY;
goto done;
}
keystr = normalize_reg_path(ctx, keystr);
if (!keystr) {
status = NT_STATUS_NO_MEMORY;
goto done;
}
status = dbwrap_fetch_bystring(db, ctx, keystr, &old_data);
if (NT_STATUS_IS_OK(status)
&& (old_data.dptr != NULL)
&& (old_data.dsize == data.dsize)
&& (memcmp(old_data.dptr, data.dptr, data.dsize) == 0))
{
status = NT_STATUS_OK;
goto done;
}
status = dbwrap_trans_store_bystring(db, keystr, data, TDB_REPLACE);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("regdb_store_values_internal: error storing: %s\n", nt_errstr(status)));
goto done;
}
/*
* update the seqnum in the cache to prevent the next read
* from going to disk
*/
werr = regval_ctr_set_seqnum(values, dbwrap_get_seqnum(db));
status = werror_to_ntstatus(werr);
done:
TALLOC_FREE(ctx);
return status;
}
struct regdb_store_values_ctx {
const char *key;
struct regval_ctr *values;
};
static NTSTATUS regdb_store_values_action(struct db_context *db,
void *private_data)
{
NTSTATUS status;
struct regdb_store_values_ctx *ctx =
(struct regdb_store_values_ctx *)private_data;
status = regdb_store_values_internal(db, ctx->key, ctx->values);
return status;
}
static bool regdb_store_values(const char *key, struct regval_ctr *values)
{
WERROR werr;
struct regdb_store_values_ctx ctx;
ctx.key = key;
ctx.values = values;
werr = regdb_trans_do(regdb, regdb_store_values_action, &ctx);
return W_ERROR_IS_OK(werr);
}
static WERROR regdb_get_secdesc(TALLOC_CTX *mem_ctx, const char *key,
struct security_descriptor **psecdesc)
{
char *tdbkey;
TDB_DATA data;
NTSTATUS status;
TALLOC_CTX *tmp_ctx = talloc_stackframe();
WERROR err = WERR_OK;
DEBUG(10, ("regdb_get_secdesc: Getting secdesc of key [%s]\n", key));
if (!regdb_key_exists(regdb, key)) {
err = WERR_FILE_NOT_FOUND;
goto done;
}
tdbkey = talloc_asprintf(tmp_ctx, "%s\\%s", REG_SECDESC_PREFIX, key);
if (tdbkey == NULL) {
err = WERR_NOT_ENOUGH_MEMORY;
goto done;
}
tdbkey = normalize_reg_path(tmp_ctx, tdbkey);
if (tdbkey == NULL) {
err = WERR_NOT_ENOUGH_MEMORY;
goto done;
}
status = dbwrap_fetch_bystring(regdb, tmp_ctx, tdbkey, &data);
if (!NT_STATUS_IS_OK(status)) {
err = WERR_FILE_NOT_FOUND;
goto done;
}
status = unmarshall_sec_desc(mem_ctx, (uint8_t *)data.dptr, data.dsize,
psecdesc);
if (NT_STATUS_EQUAL(status, NT_STATUS_NO_MEMORY)) {
err = WERR_NOT_ENOUGH_MEMORY;
} else if (!NT_STATUS_IS_OK(status)) {
err = WERR_REGISTRY_CORRUPT;
}
done:
TALLOC_FREE(tmp_ctx);
return err;
}
struct regdb_set_secdesc_ctx {
const char *key;
struct security_descriptor *secdesc;
};
static NTSTATUS regdb_set_secdesc_action(struct db_context *db,
void *private_data)
{
char *tdbkey;
NTSTATUS status;
TDB_DATA tdbdata;
struct regdb_set_secdesc_ctx *ctx =
(struct regdb_set_secdesc_ctx *)private_data;
TALLOC_CTX *frame = talloc_stackframe();
tdbkey = talloc_asprintf(frame, "%s\\%s", REG_SECDESC_PREFIX, ctx->key);
if (tdbkey == NULL) {
status = NT_STATUS_NO_MEMORY;
goto done;
}
tdbkey = normalize_reg_path(frame, tdbkey);
if (tdbkey == NULL) {
status = NT_STATUS_NO_MEMORY;
goto done;
}
if (ctx->secdesc == NULL) {
/* assuming a delete */
status = dbwrap_delete_bystring(db, tdbkey);
goto done;
}
status = marshall_sec_desc(frame, ctx->secdesc, &tdbdata.dptr,
&tdbdata.dsize);
if (!NT_STATUS_IS_OK(status)) {
goto done;
}
status = dbwrap_store_bystring(db, tdbkey, tdbdata, 0);
done:
TALLOC_FREE(frame);
return status;
}
static WERROR regdb_set_secdesc(const char *key,
struct security_descriptor *secdesc)
{
WERROR err;
struct regdb_set_secdesc_ctx ctx;
if (!regdb_key_exists(regdb, key)) {
err = WERR_FILE_NOT_FOUND;
goto done;
}
ctx.key = key;
ctx.secdesc = secdesc;
err = regdb_trans_do(regdb, regdb_set_secdesc_action, &ctx);
done:
return err;
}
static bool regdb_subkeys_need_update(struct regsubkey_ctr *subkeys)
{
return (regdb_get_seqnum() != regsubkey_ctr_get_seqnum(subkeys));
}
static bool regdb_values_need_update(struct regval_ctr *values)
{
return (regdb_get_seqnum() != regval_ctr_get_seqnum(values));
}
/*
* Table of function pointers for default access
*/
struct registry_ops regdb_ops = {
.fetch_subkeys = regdb_fetch_keys,
.fetch_values = regdb_fetch_values,
.store_subkeys = regdb_store_keys,
.store_values = regdb_store_values,
.create_subkey = regdb_create_subkey,
.delete_subkey = regdb_delete_subkey,
.get_secdesc = regdb_get_secdesc,
.set_secdesc = regdb_set_secdesc,
.subkeys_need_update = regdb_subkeys_need_update,
.values_need_update = regdb_values_need_update
};