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admin/phpMyAdmin/libraries/classes/CheckUserPrivileges.php
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330
admin/phpMyAdmin/libraries/classes/CheckUserPrivileges.php
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<?php
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/**
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* Get user's global privileges and some db-specific privileges
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*/
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declare(strict_types=1);
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namespace PhpMyAdmin;
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use PhpMyAdmin\Query\Utilities;
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use PhpMyAdmin\Utils\SessionCache;
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use function mb_strpos;
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use function mb_substr;
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use function preg_match;
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use function preg_replace;
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use function str_contains;
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/**
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* PhpMyAdmin\CheckUserPrivileges class
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*/
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class CheckUserPrivileges
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{
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/** @var DatabaseInterface */
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private $dbi;
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/**
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* @param DatabaseInterface $dbi DatabaseInterface object
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*/
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public function __construct(DatabaseInterface $dbi)
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{
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$this->dbi = $dbi;
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}
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/**
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* Extracts details from a result row of a SHOW GRANT query
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*
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* @param string $row grant row
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*
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* @return array
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*/
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public function getItemsFromShowGrantsRow(string $row): array
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{
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$dbNameOffset = mb_strpos($row, ' ON ') + 4;
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$tableNameEndOffset = mb_strpos($row, ' TO ');
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$tableNameStartOffset = false;
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$tableNameStartOffset2 = mb_strpos($row, '`.', $dbNameOffset);
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if ($tableNameStartOffset2 && $tableNameStartOffset2 < $tableNameEndOffset) {
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$tableNameStartOffset = $tableNameStartOffset2 + 1;
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}
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if ($tableNameStartOffset === false) {
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$tableNameStartOffset = mb_strpos($row, '.', $dbNameOffset);
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}
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$showGrantsDbName = mb_substr($row, $dbNameOffset, $tableNameStartOffset - $dbNameOffset);
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$showGrantsDbName = Util::unQuote($showGrantsDbName, '`');
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$showGrantsString = mb_substr(
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$row,
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6,
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mb_strpos($row, ' ON ') - 6
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);
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$showGrantsTableName = mb_substr(
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$row,
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$tableNameStartOffset + 1,
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$tableNameEndOffset - $tableNameStartOffset - 1
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);
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$showGrantsTableName = Util::unQuote($showGrantsTableName, '`');
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return [
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$showGrantsString,
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$showGrantsDbName,
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$showGrantsTableName,
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];
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}
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/**
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* Check if user has required privileges for
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* performing 'Adjust privileges' operations
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*
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* @param string $showGrantsString string containing grants for user
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* @param string $showGrantsDbName name of db extracted from grant string
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* @param string $showGrantsTableName name of table extracted from grant string
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*/
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public function checkRequiredPrivilegesForAdjust(
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string $showGrantsString,
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string $showGrantsDbName,
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string $showGrantsTableName
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): void {
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// '... ALL PRIVILEGES ON *.* ...' OR '... ALL PRIVILEGES ON `mysql`.* ..'
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// OR
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// SELECT, INSERT, UPDATE, DELETE .... ON *.* OR `mysql`.*
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if (
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$showGrantsString !== 'ALL'
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&& $showGrantsString !== 'ALL PRIVILEGES'
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&& (mb_strpos($showGrantsString, 'SELECT, INSERT, UPDATE, DELETE') === false)
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) {
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return;
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}
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if ($showGrantsDbName === '*' && $showGrantsTableName === '*') {
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$GLOBALS['col_priv'] = true;
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$GLOBALS['db_priv'] = true;
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$GLOBALS['proc_priv'] = true;
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$GLOBALS['table_priv'] = true;
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if ($showGrantsString === 'ALL PRIVILEGES' || $showGrantsString === 'ALL') {
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$GLOBALS['is_reload_priv'] = true;
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}
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}
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// check for specific tables in `mysql` db
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// Ex. '... ALL PRIVILEGES on `mysql`.`columns_priv` .. '
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if ($showGrantsDbName !== 'mysql') {
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return;
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}
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switch ($showGrantsTableName) {
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case 'columns_priv':
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$GLOBALS['col_priv'] = true;
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break;
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case 'db':
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$GLOBALS['db_priv'] = true;
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break;
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case 'procs_priv':
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$GLOBALS['proc_priv'] = true;
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break;
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case 'tables_priv':
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$GLOBALS['table_priv'] = true;
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break;
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case '*':
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$GLOBALS['col_priv'] = true;
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$GLOBALS['db_priv'] = true;
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$GLOBALS['proc_priv'] = true;
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$GLOBALS['table_priv'] = true;
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break;
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default:
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}
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}
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/**
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* sets privilege information extracted from SHOW GRANTS result
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*
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* Detection for some CREATE privilege.
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*
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* Since MySQL 4.1.2, we can easily detect current user's grants using $userlink
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* (no control user needed) and we don't have to try any other method for
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* detection
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*
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* @todo fix to get really all privileges, not only explicitly defined for this user
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* from MySQL manual: (https://dev.mysql.com/doc/refman/5.0/en/show-grants.html)
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* SHOW GRANTS displays only the privileges granted explicitly to the named
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* account. Other privileges might be available to the account, but they are not
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* displayed. For example, if an anonymous account exists, the named account
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* might be able to use its privileges, but SHOW GRANTS will not display them.
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*/
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private function analyseShowGrant(): void
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{
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if (SessionCache::has('is_create_db_priv')) {
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$GLOBALS['is_create_db_priv'] = SessionCache::get('is_create_db_priv');
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$GLOBALS['is_reload_priv'] = SessionCache::get('is_reload_priv');
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$GLOBALS['db_to_create'] = SessionCache::get('db_to_create');
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$GLOBALS['dbs_where_create_table_allowed'] = SessionCache::get('dbs_where_create_table_allowed');
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$GLOBALS['dbs_to_test'] = SessionCache::get('dbs_to_test');
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$GLOBALS['db_priv'] = SessionCache::get('db_priv');
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$GLOBALS['col_priv'] = SessionCache::get('col_priv');
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$GLOBALS['table_priv'] = SessionCache::get('table_priv');
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$GLOBALS['proc_priv'] = SessionCache::get('proc_priv');
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return;
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}
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// defaults
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$GLOBALS['is_create_db_priv'] = false;
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$GLOBALS['is_reload_priv'] = false;
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$GLOBALS['db_to_create'] = '';
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$GLOBALS['dbs_where_create_table_allowed'] = [];
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$GLOBALS['dbs_to_test'] = Utilities::getSystemSchemas();
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$GLOBALS['proc_priv'] = false;
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$GLOBALS['db_priv'] = false;
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$GLOBALS['col_priv'] = false;
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$GLOBALS['table_priv'] = false;
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$showGrantsResult = $this->dbi->tryQuery('SHOW GRANTS');
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if (! $showGrantsResult) {
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return;
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}
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$re0 = '(^|(\\\\\\\\)+|[^\\\\])'; // non-escaped wildcards
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$re1 = '(^|[^\\\\])(\\\)+'; // escaped wildcards
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while ($row = $showGrantsResult->fetchRow()) {
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[
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$showGrantsString,
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$showGrantsDbName,
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$showGrantsTableName,
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] = $this->getItemsFromShowGrantsRow($row[0]);
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if ($showGrantsDbName === '*') {
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if ($showGrantsString !== 'USAGE') {
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$GLOBALS['dbs_to_test'] = false;
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}
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} elseif ($GLOBALS['dbs_to_test'] !== false) {
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$GLOBALS['dbs_to_test'][] = $showGrantsDbName;
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}
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if (str_contains($showGrantsString, 'RELOAD')) {
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$GLOBALS['is_reload_priv'] = true;
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}
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// check for the required privileges for adjust
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$this->checkRequiredPrivilegesForAdjust($showGrantsString, $showGrantsDbName, $showGrantsTableName);
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/**
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* @todo if we find CREATE VIEW but not CREATE, do not offer
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* the create database dialog box
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*/
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if (
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$showGrantsString !== 'ALL'
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&& $showGrantsString !== 'ALL PRIVILEGES'
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&& $showGrantsString !== 'CREATE'
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&& ! str_contains($showGrantsString, 'CREATE,')
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) {
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continue;
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}
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if ($showGrantsDbName === '*') {
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// a global CREATE privilege
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$GLOBALS['is_create_db_priv'] = true;
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$GLOBALS['is_reload_priv'] = true;
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$GLOBALS['db_to_create'] = '';
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$GLOBALS['dbs_where_create_table_allowed'][] = '*';
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// @todo we should not break here, cause GRANT ALL *.*
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// could be revoked by a later rule like GRANT SELECT ON db.*
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break;
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}
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// this array may contain wildcards
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$GLOBALS['dbs_where_create_table_allowed'][] = $showGrantsDbName;
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$dbNameToTest = Util::backquote($showGrantsDbName);
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if ($GLOBALS['is_create_db_priv']) {
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// no need for any more tests if we already know this
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continue;
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}
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// does this db exist?
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if (
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(! preg_match('/' . $re0 . '%|_/', $showGrantsDbName)
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|| preg_match('/\\\\%|\\\\_/', $showGrantsDbName))
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&& ($this->dbi->tryQuery(
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'USE ' . preg_replace(
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'/' . $re1 . '(%|_)/',
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'\\1\\3',
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$dbNameToTest
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)
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)
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|| mb_substr($this->dbi->getError(), 1, 4) == 1044)
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) {
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continue;
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}
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/**
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* Do not handle the underscore wildcard
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* (this case must be rare anyway)
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*/
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$GLOBALS['db_to_create'] = preg_replace('/' . $re0 . '%/', '\\1', $showGrantsDbName);
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$GLOBALS['db_to_create'] = preg_replace('/' . $re1 . '(%|_)/', '\\1\\3', $GLOBALS['db_to_create']);
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$GLOBALS['is_create_db_priv'] = true;
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/**
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* @todo collect $GLOBALS['db_to_create'] into an array,
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* to display a drop-down in the "Create database" dialog
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*/
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// we don't break, we want all possible databases
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//break;
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}
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// must also cacheUnset() them in
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// PhpMyAdmin\Plugins\Auth\AuthenticationCookie
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SessionCache::set('is_create_db_priv', $GLOBALS['is_create_db_priv']);
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SessionCache::set('is_reload_priv', $GLOBALS['is_reload_priv']);
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SessionCache::set('db_to_create', $GLOBALS['db_to_create']);
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SessionCache::set('dbs_where_create_table_allowed', $GLOBALS['dbs_where_create_table_allowed']);
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SessionCache::set('dbs_to_test', $GLOBALS['dbs_to_test']);
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SessionCache::set('proc_priv', $GLOBALS['proc_priv']);
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SessionCache::set('table_priv', $GLOBALS['table_priv']);
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SessionCache::set('col_priv', $GLOBALS['col_priv']);
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SessionCache::set('db_priv', $GLOBALS['db_priv']);
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}
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/**
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* Get user's global privileges and some db-specific privileges
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*/
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public function getPrivileges(): void
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{
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$username = '';
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$current = $this->dbi->getCurrentUserAndHost();
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if (! empty($current)) {
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[$username] = $current;
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}
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// If MySQL is started with --skip-grant-tables
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if ($username === '') {
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$GLOBALS['is_create_db_priv'] = true;
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$GLOBALS['is_reload_priv'] = true;
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$GLOBALS['db_to_create'] = '';
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$GLOBALS['dbs_where_create_table_allowed'] = ['*'];
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$GLOBALS['dbs_to_test'] = false;
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$GLOBALS['db_priv'] = true;
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$GLOBALS['col_priv'] = true;
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$GLOBALS['table_priv'] = true;
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$GLOBALS['proc_priv'] = true;
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return;
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}
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$this->analyseShowGrant();
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}
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}
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