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sql->contents ); $sql = str_replace( RunSql::TABLE_PREFIX_PLACEHOLDER, $wpdb->prefix, $sql ); // Check if the query type is allowed. if ( ! $this->is_allowed_query_type( $sql ) ) { $result->add_error( sprintf( 'Only %s queries are allowed.', implode( ', ', self::ALLOWED_QUERY_TYPES ) ) ); return $result; } // Check for SQL comments that might be hiding malicious code. if ( $this->contains_suspicious_comments( $sql ) ) { $result->add_error( 'SQL query contains suspicious comment patterns.' ); return $result; } // Detect SQL injection patterns. if ( $this->contains_sql_injection_patterns( $sql ) ) { $result->add_error( 'SQL query contains potential injection patterns.' ); return $result; } // Check if the query affects protected tables. if ( $this->affects_protected_tables( $sql ) ) { $result->add_error( 'Modifications to admin users or roles are not allowed.' ); return $result; } // Check if the query affects user capabilities in wp_options. if ( $this->affects_user_capabilities( $sql ) ) { $result->add_error( 'Modifications to user roles or capabilities are not allowed.' ); return $result; } $wpdb->suppress_errors( true ); $wpdb->query( 'START TRANSACTION' ); try { $query_result = $wpdb->query( $sql ); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared $last_error = $wpdb->last_error; if ( $last_error ) { $wpdb->query( 'ROLLBACK' ); $result->add_error( 'Error executing SQL: ' . $last_error ); } else { $wpdb->query( 'COMMIT' ); $result->add_debug( "Executed SQL ({$schema->sql->name}): Affected {$query_result} rows" ); } } catch ( \Throwable $e ) { $wpdb->query( 'ROLLBACK' ); $result->add_error( "Exception executing SQL: {$e->getMessage()}" ); } return $result; } /** * Returns the class name of the step this processor handles. * * @return string The class name of the step this processor handles. */ public function get_step_class(): string { return RunSql::class; } /** * Check if the current user has the required capabilities for this step. * * @param object $schema The schema to process. * * @return bool True if the user has the required capabilities. False otherwise. */ public function check_step_capabilities( $schema ): bool { if ( ! current_user_can( 'manage_options' ) ) { return false; } if ( ! current_user_can( 'edit_posts' ) ) { return false; } if ( ! current_user_can( 'edit_users' ) ) { return false; } return true; } /** * Check if the SQL query type is allowed. * * @param string $sql_content The SQL query to check. * @return bool True if the query type is allowed, false otherwise. */ private function is_allowed_query_type( string $sql_content ): bool { $uppercase_sql_content = strtoupper( trim( $sql_content ) ); foreach ( self::ALLOWED_QUERY_TYPES as $query_type ) { if ( 0 === stripos( $uppercase_sql_content, $query_type ) ) { return true; } } return false; } /** * Check for suspicious comment patterns that might hide malicious code. * * This method detects various types of SQL comments that might be used * to hide malicious SQL commands or bypass security filters. * * @param string $sql_content The SQL query to check. * @return bool True if suspicious comments found, false otherwise. */ private function contains_suspicious_comments( string $sql_content ): bool { // Quick check if there are any comments at all before running regex. if ( strpos( $sql_content, '--' ) === false && strpos( $sql_content, '/*' ) === false && strpos( $sql_content, '#' ) === false ) { return false; } // List of potentially dangerous SQL commands to check for in comments. $dangerous_commands = array( 'DELETE', 'DROP', 'ALTER', 'CREATE', 'TRUNCATE', 'GRANT', 'REVOKE', 'EXEC', 'EXECUTE', 'CALL', 'INTO OUTFILE', 'INTO DUMPFILE', 'LOAD_FILE', 'LOAD DATA', 'BENCHMARK', 'SLEEP', 'INFORMATION_SCHEMA', 'USER\\(', 'DATABASE\\(', 'SCHEMA\\(', ); $dangerous_pattern = implode( '|', $dangerous_commands ); // Check for SQL comments that might be hiding malicious code. $patterns = array( // Single-line comments (-- style) containing dangerous commands. '/--.*?(' . $dangerous_pattern . ')/i', // Single-line comments (# style) containing dangerous commands. '/#.*?(' . $dangerous_pattern . ')/i', // Multi-line comments hiding dangerous commands. '/\/\*.*?(' . $dangerous_pattern . ').*?\*\//is', // MySQL-specific execution comments (version-specific code execution). '/\/\*![0-9]*.*?\*\//', ); foreach ( $patterns as $pattern ) { if ( preg_match( $pattern, $sql_content ) ) { return true; } } return false; } /** * Check for common SQL injection patterns. * * @param string $sql_content The SQL query to check. * @return bool True if potential injection patterns found, false otherwise. */ private function contains_sql_injection_patterns( string $sql_content ): bool { $patterns = array( '/UNION\s+(?:ALL\s+)?SELECT/i', // UNION-based injections. '/OR\s+1\s*=\s*1/i', // OR 1=1 condition. '/AND\s+0\s*=\s*0/i', // AND 0=0 condition. '/;\s*--/i', // Inline comment terminations. '/SLEEP\s*\(/i', // Time-based injections. '/BENCHMARK\s*\(/i', // Benchmark-based injections. '/LOAD_FILE\s*\(/i', // File access. '/INTO\s+OUTFILE/i', // File write. '/INTO\s+DUMPFILE/i', // File dump. '/CREATE\s+(?:TEMPORARY\s+)?TABLE/i', // Table creation. '/DROP\s+TABLE/i', // Table deletion. '/ALTER\s+TABLE/i', // Table alteration. '/INFORMATION_SCHEMA/i', // Database metadata access. '/EXEC\s*\(/i', // Stored procedure execution. '/SCHEMA_NAME/i', // Schema access. '/DATABASE\(\)/i', // Current database name. '/CHR\s*\(/i', // Character function for evasion. '/CHAR\s*\(/i', // Character function for evasion. '/FROM\s+mysql\./i', // Direct MySQL system table access. '/FROM\s+information_schema\./i', // Direct information schema access. ); foreach ( $patterns as $pattern ) { if ( preg_match( $pattern, $sql_content ) ) { return true; } } return false; } /** * Check if the SQL query affects protected user tables. * * @param string $sql_content The SQL query to check. * @return bool True if the query affects protected tables, false otherwise. */ private function affects_protected_tables( string $sql_content ): bool { global $wpdb; $protected_tables = array( $wpdb->users, $wpdb->usermeta, ); foreach ( $protected_tables as $table ) { if ( preg_match( '/\b' . preg_quote( $table, '/' ) . '\b/i', $sql_content ) ) { return true; } } return false; } /** * Check if the SQL query affects user capabilities in wp_options. * * @param string $sql_content The SQL query to check. * @return bool True if the query affects user capabilities, false otherwise. */ private function affects_user_capabilities( string $sql_content ): bool { global $wpdb; // Check if the query affects user capabilities in wp_options. if ( stripos( $sql_content, $wpdb->prefix . 'options' ) !== false ) { $option_patterns = array( 'user_roles', 'capabilities', 'wp_user_', 'role_', 'administrator', ); foreach ( $option_patterns as $pattern ) { if ( stripos( $sql_content, $pattern ) !== false ) { return true; } } } return false; } }