You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
331 lines
11 KiB
331 lines
11 KiB
2 years ago
|
<?php
|
||
|
|
/**
|
||
|
|
* Get user's global privileges and some db-specific privileges
|
||
|
|
*/
|
||
|
|
|
||
|
|
declare(strict_types=1);
|
||
|
|
|
||
|
|
namespace PhpMyAdmin;
|
||
|
|
|
||
|
|
use PhpMyAdmin\Query\Utilities;
|
||
|
|
use PhpMyAdmin\Utils\SessionCache;
|
||
|
|
|
||
|
|
use function mb_strpos;
|
||
|
|
use function mb_substr;
|
||
|
|
use function preg_match;
|
||
|
|
use function preg_replace;
|
||
|
|
use function str_contains;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* PhpMyAdmin\CheckUserPrivileges class
|
||
|
|
*/
|
||
|
|
class CheckUserPrivileges
|
||
|
|
{
|
||
|
|
/** @var DatabaseInterface */
|
||
|
|
private $dbi;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @param DatabaseInterface $dbi DatabaseInterface object
|
||
|
|
*/
|
||
|
|
public function __construct(DatabaseInterface $dbi)
|
||
|
|
{
|
||
|
|
$this->dbi = $dbi;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Extracts details from a result row of a SHOW GRANT query
|
||
|
|
*
|
||
|
|
* @param string $row grant row
|
||
|
|
*
|
||
|
|
* @return array
|
||
|
|
*/
|
||
|
|
public function getItemsFromShowGrantsRow(string $row): array
|
||
|
|
{
|
||
|
|
$dbNameOffset = mb_strpos($row, ' ON ') + 4;
|
||
|
|
|
||
|
|
$tableNameEndOffset = mb_strpos($row, ' TO ');
|
||
|
|
$tableNameStartOffset = false;
|
||
|
|
$tableNameStartOffset2 = mb_strpos($row, '`.', $dbNameOffset);
|
||
|
|
|
||
|
|
if ($tableNameStartOffset2 && $tableNameStartOffset2 < $tableNameEndOffset) {
|
||
|
|
$tableNameStartOffset = $tableNameStartOffset2 + 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ($tableNameStartOffset === false) {
|
||
|
|
$tableNameStartOffset = mb_strpos($row, '.', $dbNameOffset);
|
||
|
|
}
|
||
|
|
|
||
|
|
$showGrantsDbName = mb_substr($row, $dbNameOffset, $tableNameStartOffset - $dbNameOffset);
|
||
|
|
|
||
|
|
$showGrantsDbName = Util::unQuote($showGrantsDbName, '`');
|
||
|
|
|
||
|
|
$showGrantsString = mb_substr(
|
||
|
|
$row,
|
||
|
|
6,
|
||
|
|
mb_strpos($row, ' ON ') - 6
|
||
|
|
);
|
||
|
|
|
||
|
|
$showGrantsTableName = mb_substr(
|
||
|
|
$row,
|
||
|
|
$tableNameStartOffset + 1,
|
||
|
|
$tableNameEndOffset - $tableNameStartOffset - 1
|
||
|
|
);
|
||
|
|
$showGrantsTableName = Util::unQuote($showGrantsTableName, '`');
|
||
|
|
|
||
|
|
return [
|
||
|
|
$showGrantsString,
|
||
|
|
$showGrantsDbName,
|
||
|
|
$showGrantsTableName,
|
||
|
|
];
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Check if user has required privileges for
|
||
|
|
* performing 'Adjust privileges' operations
|
||
|
|
*
|
||
|
|
* @param string $showGrantsString string containing grants for user
|
||
|
|
* @param string $showGrantsDbName name of db extracted from grant string
|
||
|
|
* @param string $showGrantsTableName name of table extracted from grant string
|
||
|
|
*/
|
||
|
|
public function checkRequiredPrivilegesForAdjust(
|
||
|
|
string $showGrantsString,
|
||
|
|
string $showGrantsDbName,
|
||
|
|
string $showGrantsTableName
|
||
|
|
): void {
|
||
|
|
// '... ALL PRIVILEGES ON *.* ...' OR '... ALL PRIVILEGES ON `mysql`.* ..'
|
||
|
|
// OR
|
||
|
|
// SELECT, INSERT, UPDATE, DELETE .... ON *.* OR `mysql`.*
|
||
|
|
if (
|
||
|
|
$showGrantsString !== 'ALL'
|
||
|
|
&& $showGrantsString !== 'ALL PRIVILEGES'
|
||
|
|
&& (mb_strpos($showGrantsString, 'SELECT, INSERT, UPDATE, DELETE') === false)
|
||
|
|
) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ($showGrantsDbName === '*' && $showGrantsTableName === '*') {
|
||
|
|
$GLOBALS['col_priv'] = true;
|
||
|
|
$GLOBALS['db_priv'] = true;
|
||
|
|
$GLOBALS['proc_priv'] = true;
|
||
|
|
$GLOBALS['table_priv'] = true;
|
||
|
|
|
||
|
|
if ($showGrantsString === 'ALL PRIVILEGES' || $showGrantsString === 'ALL') {
|
||
|
|
$GLOBALS['is_reload_priv'] = true;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// check for specific tables in `mysql` db
|
||
|
|
// Ex. '... ALL PRIVILEGES on `mysql`.`columns_priv` .. '
|
||
|
|
if ($showGrantsDbName !== 'mysql') {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
switch ($showGrantsTableName) {
|
||
|
|
case 'columns_priv':
|
||
|
|
$GLOBALS['col_priv'] = true;
|
||
|
|
break;
|
||
|
|
case 'db':
|
||
|
|
$GLOBALS['db_priv'] = true;
|
||
|
|
break;
|
||
|
|
case 'procs_priv':
|
||
|
|
$GLOBALS['proc_priv'] = true;
|
||
|
|
break;
|
||
|
|
case 'tables_priv':
|
||
|
|
$GLOBALS['table_priv'] = true;
|
||
|
|
break;
|
||
|
|
case '*':
|
||
|
|
$GLOBALS['col_priv'] = true;
|
||
|
|
$GLOBALS['db_priv'] = true;
|
||
|
|
$GLOBALS['proc_priv'] = true;
|
||
|
|
$GLOBALS['table_priv'] = true;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* sets privilege information extracted from SHOW GRANTS result
|
||
|
|
*
|
||
|
|
* Detection for some CREATE privilege.
|
||
|
|
*
|
||
|
|
* Since MySQL 4.1.2, we can easily detect current user's grants using $userlink
|
||
|
|
* (no control user needed) and we don't have to try any other method for
|
||
|
|
* detection
|
||
|
|
*
|
||
|
|
* @todo fix to get really all privileges, not only explicitly defined for this user
|
||
|
|
* from MySQL manual: (https://dev.mysql.com/doc/refman/5.0/en/show-grants.html)
|
||
|
|
* SHOW GRANTS displays only the privileges granted explicitly to the named
|
||
|
|
* account. Other privileges might be available to the account, but they are not
|
||
|
|
* displayed. For example, if an anonymous account exists, the named account
|
||
|
|
* might be able to use its privileges, but SHOW GRANTS will not display them.
|
||
|
|
*/
|
||
|
|
private function analyseShowGrant(): void
|
||
|
|
{
|
||
|
|
if (SessionCache::has('is_create_db_priv')) {
|
||
|
|
$GLOBALS['is_create_db_priv'] = SessionCache::get('is_create_db_priv');
|
||
|
|
$GLOBALS['is_reload_priv'] = SessionCache::get('is_reload_priv');
|
||
|
|
$GLOBALS['db_to_create'] = SessionCache::get('db_to_create');
|
||
|
|
$GLOBALS['dbs_where_create_table_allowed'] = SessionCache::get('dbs_where_create_table_allowed');
|
||
|
|
$GLOBALS['dbs_to_test'] = SessionCache::get('dbs_to_test');
|
||
|
|
|
||
|
|
$GLOBALS['db_priv'] = SessionCache::get('db_priv');
|
||
|
|
$GLOBALS['col_priv'] = SessionCache::get('col_priv');
|
||
|
|
$GLOBALS['table_priv'] = SessionCache::get('table_priv');
|
||
|
|
$GLOBALS['proc_priv'] = SessionCache::get('proc_priv');
|
||
|
|
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
// defaults
|
||
|
|
$GLOBALS['is_create_db_priv'] = false;
|
||
|
|
$GLOBALS['is_reload_priv'] = false;
|
||
|
|
$GLOBALS['db_to_create'] = '';
|
||
|
|
$GLOBALS['dbs_where_create_table_allowed'] = [];
|
||
|
|
$GLOBALS['dbs_to_test'] = Utilities::getSystemSchemas();
|
||
|
|
$GLOBALS['proc_priv'] = false;
|
||
|
|
$GLOBALS['db_priv'] = false;
|
||
|
|
$GLOBALS['col_priv'] = false;
|
||
|
|
$GLOBALS['table_priv'] = false;
|
||
|
|
|
||
|
|
$showGrantsResult = $this->dbi->tryQuery('SHOW GRANTS');
|
||
|
|
|
||
|
|
if (! $showGrantsResult) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
$re0 = '(^|(\\\\\\\\)+|[^\\\\])'; // non-escaped wildcards
|
||
|
|
$re1 = '(^|[^\\\\])(\\\)+'; // escaped wildcards
|
||
|
|
|
||
|
|
while ($row = $showGrantsResult->fetchRow()) {
|
||
|
|
[
|
||
|
|
$showGrantsString,
|
||
|
|
$showGrantsDbName,
|
||
|
|
$showGrantsTableName,
|
||
|
|
] = $this->getItemsFromShowGrantsRow($row[0]);
|
||
|
|
|
||
|
|
if ($showGrantsDbName === '*') {
|
||
|
|
if ($showGrantsString !== 'USAGE') {
|
||
|
|
$GLOBALS['dbs_to_test'] = false;
|
||
|
|
}
|
||
|
|
} elseif ($GLOBALS['dbs_to_test'] !== false) {
|
||
|
|
$GLOBALS['dbs_to_test'][] = $showGrantsDbName;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (str_contains($showGrantsString, 'RELOAD')) {
|
||
|
|
$GLOBALS['is_reload_priv'] = true;
|
||
|
|
}
|
||
|
|
|
||
|
|
// check for the required privileges for adjust
|
||
|
|
$this->checkRequiredPrivilegesForAdjust($showGrantsString, $showGrantsDbName, $showGrantsTableName);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @todo if we find CREATE VIEW but not CREATE, do not offer
|
||
|
|
* the create database dialog box
|
||
|
|
*/
|
||
|
|
if (
|
||
|
|
$showGrantsString !== 'ALL'
|
||
|
|
&& $showGrantsString !== 'ALL PRIVILEGES'
|
||
|
|
&& $showGrantsString !== 'CREATE'
|
||
|
|
&& ! str_contains($showGrantsString, 'CREATE,')
|
||
|
|
) {
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ($showGrantsDbName === '*') {
|
||
|
|
// a global CREATE privilege
|
||
|
|
$GLOBALS['is_create_db_priv'] = true;
|
||
|
|
$GLOBALS['is_reload_priv'] = true;
|
||
|
|
$GLOBALS['db_to_create'] = '';
|
||
|
|
$GLOBALS['dbs_where_create_table_allowed'][] = '*';
|
||
|
|
// @todo we should not break here, cause GRANT ALL *.*
|
||
|
|
// could be revoked by a later rule like GRANT SELECT ON db.*
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
// this array may contain wildcards
|
||
|
|
$GLOBALS['dbs_where_create_table_allowed'][] = $showGrantsDbName;
|
||
|
|
|
||
|
|
$dbNameToTest = Util::backquote($showGrantsDbName);
|
||
|
|
|
||
|
|
if ($GLOBALS['is_create_db_priv']) {
|
||
|
|
// no need for any more tests if we already know this
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
// does this db exist?
|
||
|
|
if (
|
||
|
|
(! preg_match('/' . $re0 . '%|_/', $showGrantsDbName)
|
||
|
|
|| preg_match('/\\\\%|\\\\_/', $showGrantsDbName))
|
||
|
|
&& ($this->dbi->tryQuery(
|
||
|
|
'USE ' . preg_replace(
|
||
|
|
'/' . $re1 . '(%|_)/',
|
||
|
|
'\\1\\3',
|
||
|
|
$dbNameToTest
|
||
|
|
)
|
||
|
|
)
|
||
|
|
|| mb_substr($this->dbi->getError(), 1, 4) == 1044)
|
||
|
|
) {
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Do not handle the underscore wildcard
|
||
|
|
* (this case must be rare anyway)
|
||
|
|
*/
|
||
|
|
$GLOBALS['db_to_create'] = preg_replace('/' . $re0 . '%/', '\\1', $showGrantsDbName);
|
||
|
|
$GLOBALS['db_to_create'] = preg_replace('/' . $re1 . '(%|_)/', '\\1\\3', $GLOBALS['db_to_create']);
|
||
|
|
$GLOBALS['is_create_db_priv'] = true;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @todo collect $GLOBALS['db_to_create'] into an array,
|
||
|
|
* to display a drop-down in the "Create database" dialog
|
||
|
|
*/
|
||
|
|
// we don't break, we want all possible databases
|
||
|
|
//break;
|
||
|
|
}
|
||
|
|
|
||
|
|
// must also cacheUnset() them in
|
||
|
|
// PhpMyAdmin\Plugins\Auth\AuthenticationCookie
|
||
|
|
SessionCache::set('is_create_db_priv', $GLOBALS['is_create_db_priv']);
|
||
|
|
SessionCache::set('is_reload_priv', $GLOBALS['is_reload_priv']);
|
||
|
|
SessionCache::set('db_to_create', $GLOBALS['db_to_create']);
|
||
|
|
SessionCache::set('dbs_where_create_table_allowed', $GLOBALS['dbs_where_create_table_allowed']);
|
||
|
|
SessionCache::set('dbs_to_test', $GLOBALS['dbs_to_test']);
|
||
|
|
|
||
|
|
SessionCache::set('proc_priv', $GLOBALS['proc_priv']);
|
||
|
|
SessionCache::set('table_priv', $GLOBALS['table_priv']);
|
||
|
|
SessionCache::set('col_priv', $GLOBALS['col_priv']);
|
||
|
|
SessionCache::set('db_priv', $GLOBALS['db_priv']);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Get user's global privileges and some db-specific privileges
|
||
|
|
*/
|
||
|
|
public function getPrivileges(): void
|
||
|
|
{
|
||
|
|
$username = '';
|
||
|
|
|
||
|
|
$current = $this->dbi->getCurrentUserAndHost();
|
||
|
|
if (! empty($current)) {
|
||
|
|
[$username] = $current;
|
||
|
|
}
|
||
|
|
|
||
|
|
// If MySQL is started with --skip-grant-tables
|
||
|
|
if ($username === '') {
|
||
|
|
$GLOBALS['is_create_db_priv'] = true;
|
||
|
|
$GLOBALS['is_reload_priv'] = true;
|
||
|
|
$GLOBALS['db_to_create'] = '';
|
||
|
|
$GLOBALS['dbs_where_create_table_allowed'] = ['*'];
|
||
|
|
$GLOBALS['dbs_to_test'] = false;
|
||
|
|
$GLOBALS['db_priv'] = true;
|
||
|
|
$GLOBALS['col_priv'] = true;
|
||
|
|
$GLOBALS['table_priv'] = true;
|
||
|
|
$GLOBALS['proc_priv'] = true;
|
||
|
|
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
$this->analyseShowGrant();
|
||
|
|
}
|
||
|
|
}
|