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Generate secure XML parsing code. Enforces secure parsing of XML content. Invoke when writing any XML parsing related code.
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| name | secure-xml-parsing |
| description | Generate secure XML parsing code. Enforces secure parsing of XML content. Invoke when writing any XML parsing related code. |
| allowed-tools | Read Grep Glob |
| metadata | {"category":"security"} |
Apply all rules below when generating or reviewing any code related to xml content parsing.
// BAD: DTD and External Entities are resolved / Internal Entities are replaced / XInclude support is left to default / no size limit
import org.w3c.dom.Document;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import java.io.File;
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document doc = builder.parse(new File("data.xml"));
// GOOD: DTD and External Entities are not resolved / Internal Entities are not replaced / XInclude disabled / input size limited
import org.w3c.dom.Document;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import java.io.*;
import java.nio.file.*;
int MAX_XML_SIZE_BYTES = 1 * 1024 * 1024; // 1 MB
byte[] xmlBytes = Files.readAllBytes(Path.of("data.xml"));
if (xmlBytes.length > MAX_XML_SIZE_BYTES) {
throw new IOException("XML input exceeds maximum allowed size of 1 MB");
}
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
// Disable DTD resolution entirely
factory.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true);
// Disable XML External Entity (XXE) resolution
factory.setFeature("http://xml.org/sax/features/external-general-entities", false);
factory.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
factory.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
// Disable replacement of XML Internal Entities
factory.setExpandEntityReferences(false);
// Disable XInclude support
factory.setXIncludeAware(false);
DocumentBuilder builder = factory.newDocumentBuilder();
Document doc = builder.parse(new ByteArrayInputStream(xmlBytes));
Before finalizing generated code, verify: