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330 lines
11 KiB
330 lines
11 KiB
<?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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