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|
/*
Unix SMB/CIFS implementation.
Registry interface
Copyright (C) Jelmer Vernooij 2004-2007.
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 "registry.h"
#include "lib/ldb/include/ldb.h"
#include "lib/ldb/include/ldb_errors.h"
#include "ldb_wrap.h"
#include "librpc/gen_ndr/winreg.h"
#include "param/param.h"
static struct hive_operations reg_backend_ldb;
struct ldb_key_data
{
struct hive_key key;
struct ldb_context *ldb;
struct ldb_dn *dn;
struct ldb_message **subkeys, **values;
int subkey_count, value_count;
};
static void reg_ldb_unpack_value(TALLOC_CTX *mem_ctx, struct ldb_message *msg,
const char **name, uint32_t *type,
DATA_BLOB *data)
{
const struct ldb_val *val;
uint32_t value_type;
if (name != NULL)
*name = talloc_strdup(mem_ctx,
ldb_msg_find_attr_as_string(msg, "value",
NULL));
value_type = ldb_msg_find_attr_as_uint(msg, "type", 0);
if (type != NULL)
*type = value_type;
val = ldb_msg_find_ldb_val(msg, "data");
switch (value_type)
{
case REG_SZ:
case REG_EXPAND_SZ:
data->length = convert_string_talloc(mem_ctx, lp_iconv_convenience(global_loadparm), CH_UTF8, CH_UTF16,
val->data, val->length,
(void **)&data->data);
break;
case REG_DWORD: {
uint32_t tmp = strtoul((char *)val->data, NULL, 0);
*data = data_blob_talloc(mem_ctx, &tmp, 4);
}
break;
default:
*data = data_blob_talloc(mem_ctx, val->data, val->length);
break;
}
}
static struct ldb_message *reg_ldb_pack_value(struct ldb_context *ctx,
TALLOC_CTX *mem_ctx,
const char *name,
uint32_t type, DATA_BLOB data)
{
struct ldb_val val;
struct ldb_message *msg = talloc_zero(mem_ctx, struct ldb_message);
char *type_s;
ldb_msg_add_string(msg, "value", talloc_strdup(mem_ctx, name));
switch (type) {
case REG_SZ:
case REG_EXPAND_SZ:
val.length = convert_string_talloc(mem_ctx, lp_iconv_convenience(global_loadparm), CH_UTF16, CH_UNIX,
(void *)data.data,
data.length,
(void **)&val.data);
ldb_msg_add_value(msg, "data", &val, NULL);
break;
case REG_DWORD:
ldb_msg_add_string(msg, "data",
talloc_asprintf(mem_ctx, "0x%x",
IVAL(data.data, 0)));
break;
default:
ldb_msg_add_value(msg, "data", &data, NULL);
}
type_s = talloc_asprintf(mem_ctx, "%u", type);
ldb_msg_add_string(msg, "type", type_s);
return msg;
}
static char *reg_ldb_escape(TALLOC_CTX *mem_ctx, const char *value)
{
struct ldb_val val;
val.data = discard_const_p(uint8_t, value);
val.length = strlen(value);
return ldb_dn_escape_value(mem_ctx, val);
}
static int reg_close_ldb_key(struct ldb_key_data *key)
{
if (key->subkeys != NULL) {
talloc_free(key->subkeys);
key->subkeys = NULL;
}
if (key->values != NULL) {
talloc_free(key->values);
key->values = NULL;
}
return 0;
}
static struct ldb_dn *reg_path_to_ldb(TALLOC_CTX *mem_ctx,
const struct hive_key *from,
const char *path, const char *add)
{
TALLOC_CTX *local_ctx;
struct ldb_dn *ret;
char *mypath = talloc_strdup(mem_ctx, path);
char *begin;
struct ldb_key_data *kd = talloc_get_type(from, struct ldb_key_data);
struct ldb_context *ldb = kd->ldb;
local_ctx = talloc_new(mem_ctx);
if (add) {
ret = ldb_dn_new(mem_ctx, ldb, add);
} else {
ret = ldb_dn_new(mem_ctx, ldb, NULL);
}
if (!ldb_dn_validate(ret)) {
talloc_free(ret);
talloc_free(local_ctx);
return NULL;
}
while (mypath) {
char *keyname;
begin = strrchr(mypath, '\\');
if (begin) keyname = begin + 1;
else keyname = mypath;
if(strlen(keyname)) {
if (!ldb_dn_add_base_fmt(ret, "key=%s",
reg_ldb_escape(local_ctx,
keyname)))
{
talloc_free(local_ctx);
return NULL;
}
}
if(begin) {
*begin = '\0';
} else {
break;
}
}
ldb_dn_add_base(ret, kd->dn);
talloc_free(local_ctx);
return ret;
}
static WERROR cache_subkeys(struct ldb_key_data *kd)
{
struct ldb_context *c = kd->ldb;
struct ldb_result *res;
int ret;
ret = ldb_search(c, kd->dn, LDB_SCOPE_ONELEVEL, "(key=*)", NULL, &res);
if (ret != LDB_SUCCESS) {
DEBUG(0, ("Error getting subkeys for '%s': %s\n",
ldb_dn_get_linearized(kd->dn), ldb_errstring(c)));
return WERR_FOOBAR;
}
kd->subkey_count = res->count;
kd->subkeys = talloc_steal(kd, res->msgs);
talloc_free(res);
return WERR_OK;
}
static WERROR cache_values(struct ldb_key_data *kd)
{
struct ldb_context *c = kd->ldb;
struct ldb_result *res;
int ret;
ret = ldb_search(c, kd->dn, LDB_SCOPE_ONELEVEL,
"(value=*)", NULL, &res);
if (ret != LDB_SUCCESS) {
DEBUG(0, ("Error getting values for '%s': %s\n",
ldb_dn_get_linearized(kd->dn), ldb_errstring(c)));
return WERR_FOOBAR;
}
kd->value_count = res->count;
kd->values = talloc_steal(kd, res->msgs);
talloc_free(res);
return WERR_OK;
}
static WERROR ldb_get_subkey_by_id(TALLOC_CTX *mem_ctx,
const struct hive_key *k, uint32_t idx,
const char **name,
const char **classname,
NTTIME *last_mod_time)
{
struct ldb_message_element *el;
struct ldb_key_data *kd = talloc_get_type(k, struct ldb_key_data);
/* Do a search if necessary */
if (kd->subkeys == NULL) {
W_ERROR_NOT_OK_RETURN(cache_subkeys(kd));
}
if (idx >= kd->subkey_count)
return WERR_NO_MORE_ITEMS;
el = ldb_msg_find_element(kd->subkeys[idx], "key");
SMB_ASSERT(el != NULL);
SMB_ASSERT(el->num_values != 0);
if (name != NULL)
*name = talloc_strdup(mem_ctx, (char *)el->values[0].data);
if (classname != NULL)
*classname = NULL; /* TODO: Store properly */
if (last_mod_time != NULL)
*last_mod_time = 0; /* TODO: we need to add this to the
ldb backend properly */
return WERR_OK;
}
static WERROR ldb_get_value_by_id(TALLOC_CTX *mem_ctx, struct hive_key *k,
int idx, const char **name,
uint32_t *data_type, DATA_BLOB *data)
{
struct ldb_key_data *kd = talloc_get_type(k, struct ldb_key_data);
/* Do the search if necessary */
if (kd->values == NULL) {
W_ERROR_NOT_OK_RETURN(cache_values(kd));
}
if (idx >= kd->value_count)
return WERR_NO_MORE_ITEMS;
reg_ldb_unpack_value(mem_ctx, kd->values[idx],
name, data_type, data);
return WERR_OK;
}
static WERROR ldb_get_value(TALLOC_CTX *mem_ctx, struct hive_key *k,
const char *name, uint32_t *data_type,
DATA_BLOB *data)
{
struct ldb_key_data *kd = talloc_get_type(k, struct ldb_key_data);
struct ldb_context *c = kd->ldb;
struct ldb_result *res;
int ret;
char *query = talloc_asprintf(mem_ctx, "(value=%s)", name);
ret = ldb_search(c, kd->dn, LDB_SCOPE_ONELEVEL, query, NULL, &res);
talloc_free(query);
if (ret != LDB_SUCCESS) {
DEBUG(0, ("Error getting values for '%s': %s\n",
ldb_dn_get_linearized(kd->dn), ldb_errstring(c)));
return WERR_FOOBAR;
}
if (res->count == 0)
return WERR_BADFILE;
reg_ldb_unpack_value(mem_ctx, res->msgs[0], NULL, data_type, data);
return WERR_OK;
}
static WERROR ldb_open_key(TALLOC_CTX *mem_ctx, const struct hive_key *h,
const char *name, struct hive_key **key)
{
struct ldb_result *res;
struct ldb_dn *ldap_path;
int ret;
struct ldb_key_data *newkd;
struct ldb_key_data *kd = talloc_get_type(h, struct ldb_key_data);
struct ldb_context *c = kd->ldb;
ldap_path = reg_path_to_ldb(mem_ctx, h, name, NULL);
ret = ldb_search(c, ldap_path, LDB_SCOPE_BASE, "(key=*)", NULL, &res);
if (ret != LDB_SUCCESS) {
DEBUG(3, ("Error opening key '%s': %s\n",
ldb_dn_get_linearized(ldap_path), ldb_errstring(c)));
return WERR_FOOBAR;
} else if (res->count == 0) {
DEBUG(3, ("Key '%s' not found\n",
ldb_dn_get_linearized(ldap_path)));
talloc_free(res);
return WERR_BADFILE;
}
newkd = talloc_zero(mem_ctx, struct ldb_key_data);
newkd->key.ops = ®_backend_ldb;
newkd->ldb = talloc_reference(newkd, kd->ldb);
newkd->dn = ldb_dn_copy(mem_ctx, res->msgs[0]->dn);
*key = (struct hive_key *)newkd;
talloc_free(res);
return WERR_OK;
}
WERROR reg_open_ldb_file(TALLOC_CTX *parent_ctx, const char *location,
struct auth_session_info *session_info,
struct cli_credentials *credentials,
struct loadparm_context *lp_ctx,
struct hive_key **k)
{
struct ldb_key_data *kd;
struct ldb_context *wrap;
struct ldb_message *attrs_msg;
if (location == NULL)
return WERR_INVALID_PARAM;
wrap = ldb_wrap_connect(parent_ctx, lp_ctx,
location, session_info, credentials, 0, NULL);
if (wrap == NULL) {
DEBUG(1, (__FILE__": unable to connect\n"));
return WERR_FOOBAR;
}
attrs_msg = ldb_msg_new(wrap);
W_ERROR_HAVE_NO_MEMORY(attrs_msg);
attrs_msg->dn = ldb_dn_new(attrs_msg, wrap, "@ATTRIBUTES");
W_ERROR_HAVE_NO_MEMORY(attrs_msg->dn);
ldb_msg_add_string(attrs_msg, "key", "CASE_INSENSITIVE");
ldb_msg_add_string(attrs_msg, "value", "CASE_INSENSITIVE");
ldb_add(wrap, attrs_msg);
ldb_set_debug_stderr(wrap);
kd = talloc_zero(parent_ctx, struct ldb_key_data);
kd->key.ops = ®_backend_ldb;
kd->ldb = talloc_reference(kd, wrap);
talloc_set_destructor (kd, reg_close_ldb_key);
kd->dn = ldb_dn_new(kd, wrap, "hive=NONE");
*k = (struct hive_key *)kd;
return WERR_OK;
}
static WERROR ldb_add_key(TALLOC_CTX *mem_ctx, const struct hive_key *parent,
const char *name, const char *classname,
struct security_descriptor *sd,
struct hive_key **newkey)
{
struct ldb_key_data *parentkd = discard_const_p(struct ldb_key_data, parent);
struct ldb_message *msg;
struct ldb_key_data *newkd;
int ret;
msg = ldb_msg_new(mem_ctx);
msg->dn = reg_path_to_ldb(msg, parent, name, NULL);
ldb_msg_add_string(msg, "key", talloc_strdup(mem_ctx, name));
if (classname != NULL)
ldb_msg_add_string(msg, "classname",
talloc_strdup(mem_ctx, classname));
ret = ldb_add(parentkd->ldb, msg);
if (ret == LDB_ERR_ENTRY_ALREADY_EXISTS) {
return WERR_ALREADY_EXISTS;
}
if (ret != LDB_SUCCESS) {
DEBUG(1, ("ldb_add: %s\n", ldb_errstring(parentkd->ldb)));
return WERR_FOOBAR;
}
DEBUG(2, ("key added: %s\n", ldb_dn_get_linearized(msg->dn)));
newkd = talloc_zero(mem_ctx, struct ldb_key_data);
newkd->ldb = talloc_reference(newkd, parentkd->ldb);
newkd->key.ops = ®_backend_ldb;
newkd->dn = talloc_steal(newkd, msg->dn);
*newkey = (struct hive_key *)newkd;
/* reset cache */
talloc_free(parentkd->subkeys);
parentkd->subkeys = NULL;
return WERR_OK;
}
static WERROR ldb_del_value (struct hive_key *key, const char *child)
{
int ret;
struct ldb_key_data *kd = talloc_get_type(key, struct ldb_key_data);
struct ldb_dn *childdn;
childdn = ldb_dn_copy(kd->ldb, kd->dn);
if (!ldb_dn_add_child_fmt(childdn, "value=%s",
reg_ldb_escape(childdn, child)))
{
talloc_free(childdn);
return WERR_FOOBAR;
}
ret = ldb_delete(kd->ldb, childdn);
talloc_free(childdn);
if (ret == LDB_ERR_NO_SUCH_OBJECT) {
return WERR_BADFILE;
} else if (ret != LDB_SUCCESS) {
DEBUG(1, ("ldb_del_value: %s\n", ldb_errstring(kd->ldb)));
return WERR_FOOBAR;
}
/* reset cache */
talloc_free(kd->values);
kd->values = NULL;
return WERR_OK;
}
static WERROR ldb_del_key(const struct hive_key *key, const char *name)
{
int i, ret;
struct ldb_key_data *parentkd = talloc_get_type(key, struct ldb_key_data);
struct ldb_dn *ldap_path;
TALLOC_CTX *mem_ctx = talloc_init("ldb_del_key");
struct ldb_context *c = parentkd->ldb;
struct ldb_result *res_keys;
struct ldb_result *res_vals;
WERROR werr;
struct hive_key *hk;
/* Verify key exists by opening it */
werr = ldb_open_key(mem_ctx, key, name, &hk);
if (!W_ERROR_IS_OK(werr)) {
talloc_free(mem_ctx);
return werr;
}
ldap_path = reg_path_to_ldb(mem_ctx, key, name, NULL);
if (!ldap_path) {
talloc_free(mem_ctx);
return WERR_FOOBAR;
}
/* Search for subkeys */
ret = ldb_search(c, ldap_path, LDB_SCOPE_ONELEVEL,
"(key=*)", NULL, &res_keys);
if (ret != LDB_SUCCESS) {
DEBUG(0, ("Error getting subkeys for '%s': %s\n",
ldb_dn_get_linearized(ldap_path), ldb_errstring(c)));
talloc_free(mem_ctx);
return WERR_FOOBAR;
}
/* Search for values */
ret = ldb_search(c, ldap_path, LDB_SCOPE_ONELEVEL,
"(value=*)", NULL, &res_vals);
if (ret != LDB_SUCCESS) {
DEBUG(0, ("Error getting values for '%s': %s\n",
ldb_dn_get_linearized(ldap_path), ldb_errstring(c)));
talloc_free(mem_ctx);
return WERR_FOOBAR;
}
/* Start an explicit transaction */
ret = ldb_transaction_start(c);
if (ret != LDB_SUCCESS) {
DEBUG(0, ("ldb_transaction_start: %s\n", ldb_errstring(c)));
talloc_free(mem_ctx);
return WERR_FOOBAR;
}
if (res_keys->count || res_vals->count)
{
/* Delete any subkeys */
for (i = 0; i < res_keys->count; i++)
{
werr = ldb_del_key(hk, ldb_msg_find_attr_as_string(
res_keys->msgs[i],
"key", NULL));
if (!W_ERROR_IS_OK(werr)) {
ret = ldb_transaction_cancel(c);
talloc_free(mem_ctx);
return werr;
}
}
/* Delete any values */
for (i = 0; i < res_vals->count; i++)
{
werr = ldb_del_value(hk, ldb_msg_find_attr_as_string(
res_vals->msgs[i],
"value", NULL));
if (!W_ERROR_IS_OK(werr)) {
ret = ldb_transaction_cancel(c);
talloc_free(mem_ctx);
return werr;
}
}
}
/* Delete the key itself */
ret = ldb_delete(c, ldap_path);
if (ret != LDB_SUCCESS)
{
DEBUG(1, ("ldb_del_key: %s\n", ldb_errstring(c)));
ret = ldb_transaction_cancel(c);
talloc_free(mem_ctx);
return WERR_FOOBAR;
}
/* Commit the transaction */
ret = ldb_transaction_commit(c);
if (ret != LDB_SUCCESS)
{
DEBUG(0, ("ldb_transaction_commit: %s\n", ldb_errstring(c)));
ret = ldb_transaction_cancel(c);
talloc_free(mem_ctx);
return WERR_FOOBAR;
}
talloc_free(mem_ctx);
/* reset cache */
talloc_free(parentkd->subkeys);
parentkd->subkeys = NULL;
return WERR_OK;
}
static WERROR ldb_set_value(struct hive_key *parent,
const char *name, uint32_t type,
const DATA_BLOB data)
{
struct ldb_message *msg;
struct ldb_key_data *kd = talloc_get_type(parent, struct ldb_key_data);
int ret;
TALLOC_CTX *mem_ctx = talloc_init("ldb_set_value");
msg = reg_ldb_pack_value(kd->ldb, mem_ctx, name, type, data);
msg->dn = ldb_dn_copy(msg, kd->dn);
if (!ldb_dn_add_child_fmt(msg->dn, "value=%s",
reg_ldb_escape(mem_ctx, name)))
{
talloc_free(mem_ctx);
return WERR_FOOBAR;
}
ret = ldb_add(kd->ldb, msg);
if (ret == LDB_ERR_ENTRY_ALREADY_EXISTS) {
int i;
for (i = 0; i < msg->num_elements; i++) {
msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
}
ret = ldb_modify(kd->ldb, msg);
}
if (ret != LDB_SUCCESS) {
DEBUG(1, ("ldb_msg_add: %s\n", ldb_errstring(kd->ldb)));
talloc_free(mem_ctx);
return WERR_FOOBAR;
}
/* reset cache */
talloc_free(kd->values);
kd->values = NULL;
talloc_free(mem_ctx);
return WERR_OK;
}
static WERROR ldb_get_key_info(TALLOC_CTX *mem_ctx,
const struct hive_key *key,
const char **classname,
uint32_t *num_subkeys,
uint32_t *num_values,
NTTIME *last_change_time,
uint32_t *max_subkeynamelen,
uint32_t *max_valnamelen,
uint32_t *max_valbufsize)
{
struct ldb_key_data *kd = talloc_get_type(key, struct ldb_key_data);
if (kd->subkeys == NULL) {
W_ERROR_NOT_OK_RETURN(cache_subkeys(kd));
}
if (kd->values == NULL) {
W_ERROR_NOT_OK_RETURN(cache_values(kd));
}
/* FIXME */
if (classname != NULL)
*classname = NULL;
if (num_subkeys != NULL) {
*num_subkeys = kd->subkey_count;
}
if (num_values != NULL) {
*num_values = kd->value_count;
}
if (last_change_time != NULL)
*last_change_time = 0;
if (max_subkeynamelen != NULL) {
int i;
struct ldb_message_element *el;
*max_subkeynamelen = 0;
for (i = 0; i < kd->subkey_count; i++) {
el = ldb_msg_find_element(kd->subkeys[i], "key");
*max_subkeynamelen = MAX(*max_subkeynamelen, el->values[0].length);
}
}
if (max_valnamelen != NULL || max_valbufsize != NULL) {
int i;
struct ldb_message_element *el;
W_ERROR_NOT_OK_RETURN(cache_values(kd));
if (max_valbufsize != NULL)
*max_valbufsize = 0;
if (max_valnamelen != NULL)
*max_valnamelen = 0;
for (i = 0; i < kd->value_count; i++) {
if (max_valnamelen != NULL) {
el = ldb_msg_find_element(kd->values[i], "value");
*max_valnamelen = MAX(*max_valnamelen, el->values[0].length);
}
if (max_valbufsize != NULL) {
DATA_BLOB data;
reg_ldb_unpack_value(mem_ctx, kd->values[i], NULL,
NULL, &data);
*max_valbufsize = MAX(*max_valbufsize, data.length);
talloc_free(data.data);
}
}
}
return WERR_OK;
}
static struct hive_operations reg_backend_ldb = {
.name = "ldb",
.add_key = ldb_add_key,
.del_key = ldb_del_key,
.get_key_by_name = ldb_open_key,
.enum_value = ldb_get_value_by_id,
.enum_key = ldb_get_subkey_by_id,
.set_value = ldb_set_value,
.get_value_by_name = ldb_get_value,
.delete_value = ldb_del_value,
.get_key_info = ldb_get_key_info,
};
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