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-rw-r--r--utils/src/main/java/at/gv/egiz/dom/DOMUtils.java78
-rw-r--r--utils/src/main/java/at/gv/egiz/slbinding/SLUnmarshaller.java68
-rw-r--r--utils/src/test/java/at/gv/egiz/slbinding/UnmarshallCXSRTest.java32
-rw-r--r--utils/src/test/resources/at/gv/egiz/slbinding/CreateXMLSignatureResponse_with_Attacke.xml25
4 files changed, 190 insertions, 13 deletions
diff --git a/utils/src/main/java/at/gv/egiz/dom/DOMUtils.java b/utils/src/main/java/at/gv/egiz/dom/DOMUtils.java
index eae8f05e..2054021a 100644
--- a/utils/src/main/java/at/gv/egiz/dom/DOMUtils.java
+++ b/utils/src/main/java/at/gv/egiz/dom/DOMUtils.java
@@ -33,7 +33,8 @@ import java.io.StringWriter;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
-import javax.xml.parsers.ParserConfigurationException;
+import javax.xml.parsers.ParserConfigurationException;
+import javax.xml.stream.XMLStreamException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
@@ -47,7 +48,8 @@ import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.Text;
import org.w3c.dom.bootstrap.DOMImplementationRegistry;
-import org.w3c.dom.ls.DOMImplementationLS;
+import org.w3c.dom.ls.DOMImplementationLS;
+import org.xml.sax.SAXException;
public final class DOMUtils {
@@ -160,6 +162,76 @@ public final class DOMUtils {
base64OutputStream.close();
return doc.createTextNode(outputStream.toString("ASCII"));
- }
+ }
+
+ /**
+ * Set XML parser features to {@link DocumentBuilderFactory} to prevent XXE, XEE and SSRF attacks
+ * <br>
+ * <br>
+ * These features are set by this method:
+ * <ul>
+ * <li>http://xml.org/sax/features/external-general-entities --> false</li>
+ * <li>http://xml.org/sax/features/external-parameter-entities --> false</li>
+ * <li>http://apache.org/xml/features/nonvalidating/load-external-dtd --> false</li>
+ * <li>http://apache.org/xml/features/disallow-doctype-decl --> true</li>
+ * </ul>
+ *
+ *
+ * @param dbf {@link DocumentBuilderFactory} on which the features should be registered
+ */
+ public static void setXMLParserFlagsAgainstXXEAndSSRFAttacks(DocumentBuilderFactory dbf) {
+ try {
+ dbf.setFeature("http://xml.org/sax/features/external-general-entities", false);
+ dbf.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
+ dbf.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true);
+ dbf.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
+
+ } catch (ParserConfigurationException e) {
+ log.error("Can NOT set Xerces parser security features. -> XML parsing is possible insecure!!!! ", e);
+
+ }
+
+ }
+
+ /**
+ * Parse an {@link InputStream} that contains a XML document into a {@link Document}
+ * This method set all features to prevent XXE, XEE and SSRF attacks
+ *
+ * These features are set by this method:
+ * <ul>
+ * <li>http://xml.org/sax/features/external-general-entities --> false</li>
+ * <li>http://xml.org/sax/features/external-parameter-entities --> false</li>
+ * <li>http://apache.org/xml/features/nonvalidating/load-external-dtd --> false</li>
+ * <li>http://apache.org/xml/features/disallow-doctype-decl --> true</li>
+ * </ul>
+ *
+ * @param is {@link InputStream} that contains a serialized XML document
+ * @return Deserialized {@link Document} from input XML
+ * @throws XMLStreamException XML parser has an error
+ * @throws IOException
+ */
+ public static Document validateXMLAgainstXXEAndSSRFAttacks(InputStream is) throws XMLStreamException, IOException {
+ DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
+ setXMLParserFlagsAgainstXXEAndSSRFAttacks(dbf);
+
+ try {
+ //validate input stream
+ return dbf.newDocumentBuilder().parse(is);
+
+ } catch (SAXException e) {
+ log.error("XML data validation FAILED with msg: " + e.getMessage(), e);
+ throw new XMLStreamException("XML data validation FAILED with msg: " + e.getMessage(), e);
+
+ } catch (ParserConfigurationException e) {
+ log.error("XML data validation FAILED with msg: " + e.getMessage(), e);
+ throw new XMLStreamException("XML data validation FAILED with msg: " + e.getMessage(), e);
+
+ } catch (IOException e) {
+ log.error("XML data validation FAILED with msg: " + e.getMessage(), e);
+ throw new XMLStreamException("XML data validation FAILED with msg: " + e.getMessage(), e);
+
+ }
+
+ }
}
diff --git a/utils/src/main/java/at/gv/egiz/slbinding/SLUnmarshaller.java b/utils/src/main/java/at/gv/egiz/slbinding/SLUnmarshaller.java
index de1b2ddf..489c36d8 100644
--- a/utils/src/main/java/at/gv/egiz/slbinding/SLUnmarshaller.java
+++ b/utils/src/main/java/at/gv/egiz/slbinding/SLUnmarshaller.java
@@ -25,7 +25,10 @@
package at.gv.egiz.slbinding;
+import java.io.ByteArrayInputStream;
import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.Reader;
import java.net.URL;
import java.util.Arrays;
import java.util.Collection;
@@ -38,6 +41,8 @@ import javax.xml.bind.JAXBException;
import javax.xml.bind.UnmarshalException;
import javax.xml.bind.Unmarshaller;
import javax.xml.bind.ValidationEvent;
+import javax.xml.parsers.DocumentBuilderFactory;
+import javax.xml.parsers.ParserConfigurationException;
import javax.xml.stream.XMLEventReader;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamException;
@@ -46,11 +51,13 @@ import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;
+import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.xml.sax.SAXException;
import at.gv.egiz.bku.utils.ClasspathURLStreamHandler;
+import at.gv.egiz.dom.DOMUtils;
import at.gv.egiz.validation.ReportingValidationEventHandler;
public class SLUnmarshaller {
@@ -235,28 +242,71 @@ public class SLUnmarshaller {
* @throws JAXBException
*/
public Object unmarshal(StreamSource source) throws XMLStreamException, JAXBException {
+ Reader inputReader = source.getReader();
- ReportingValidationEventHandler validationEventHandler = new ReportingValidationEventHandler();
-// System.setProperty("javax.xml.stream.XMLInputFactory", "com.sun.xml.stream.ZephyrParserFactory");
-// System.setProperty("com.sun.xml.stream.ZephyrParserFactory", "com.sun.xml.stream.ZephyrParserFactory");
-// XMLInputFactory inputFactory = XMLInputFactory.newInstance("com.sun.xml.stream.ZephyrParserFactory", null);
-
+ /* Validate XML against XXE, XEE, and SSRF
+ *
+ * This pre-validation step is required because com.sun.xml.stream.sjsxp-1.0.2 XML stream parser library does not
+ * support all XML parser features to prevent these types of attacks
+ */
+ if (inputReader instanceof InputStreamReader) {
+ try {
+ //create copy of input stream
+ InputStreamReader isReader = (InputStreamReader) inputReader;
+ String encoding = isReader.getEncoding();
+ byte[] backup = IOUtils.toByteArray(isReader, encoding);
+
+ //validate input stream
+ DOMUtils.validateXMLAgainstXXEAndSSRFAttacks(new ByteArrayInputStream(backup));
+
+ //create new inputStreamReader for reak processing
+ inputReader = new InputStreamReader(new ByteArrayInputStream(backup), encoding);
+
+
+ } catch (XMLStreamException e) {
+ log.error("XML data validation FAILED with msg: " + e.getMessage(), e);
+ throw new XMLStreamException("XML data validation FAILED with msg: " + e.getMessage(), e);
+
+ } catch (IOException e) {
+ log.error("XML data validation FAILED with msg: " + e.getMessage(), e);
+ throw new XMLStreamException("XML data validation FAILED with msg: " + e.getMessage(), e);
+
+ }
+
+ } else {
+ log.error("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
+ log.error("Reader is not of type InputStreamReader -> can not make a copy of the InputStream --> extended XML validation is not possible!!! ");
+ log.error("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
+
+ }
+
+ /* !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+ * parse XML with original functionality
+ *
+ * This code implements the the original mocca XML processing by using
+ * com.sun.xml.stream.sjsxp-1.0.2 XML stream parser library. Currently, this library is required to get full
+ * security-layer specific XML processing. However, there this lib does not fully support XXE, XEE and SSRF
+ * prevention mechanisms (e.g.: XMLInputFactory.SUPPORT_DTD flag is not used)
+ *
+ * !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+ */
XMLInputFactory inputFactory = XMLInputFactory.newInstance();
//disallow DTD and external entities
inputFactory.setProperty(XMLInputFactory.SUPPORT_DTD, false);
inputFactory.setProperty("javax.xml.stream.isSupportingExternalEntities", false);
-
- XMLEventReader eventReader = inputFactory.createXMLEventReader(source.getReader());
+
+ XMLEventReader eventReader = inputFactory.createXMLEventReader(inputReader);
RedirectEventFilter redirectEventFilter = new RedirectEventFilter();
XMLEventReader filteredReader = inputFactory.createFilteredReader(eventReader, redirectEventFilter);
Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
+ ReportingValidationEventHandler validationEventHandler = new ReportingValidationEventHandler();
unmarshaller.setEventHandler(validationEventHandler);
unmarshaller.setListener(new RedirectUnmarshallerListener(redirectEventFilter));
- unmarshaller.setSchema(slSchema);
-
+ unmarshaller.setSchema(slSchema);
+
Object object;
try {
log.trace("Before unmarshal().");
diff --git a/utils/src/test/java/at/gv/egiz/slbinding/UnmarshallCXSRTest.java b/utils/src/test/java/at/gv/egiz/slbinding/UnmarshallCXSRTest.java
index 99c11cbe..5f97be0f 100644
--- a/utils/src/test/java/at/gv/egiz/slbinding/UnmarshallCXSRTest.java
+++ b/utils/src/test/java/at/gv/egiz/slbinding/UnmarshallCXSRTest.java
@@ -25,6 +25,7 @@
package at.gv.egiz.slbinding;
+import java.io.BufferedInputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
@@ -49,7 +50,7 @@ public class UnmarshallCXSRTest {
assertNotNull(s);
SLUnmarshaller unmarshaller = new SLUnmarshaller();
- Object object = unmarshaller.unmarshal(new StreamSource(new InputStreamReader(s)));
+ Object object = unmarshaller.unmarshal(new StreamSource(new InputStreamReader(new BufferedInputStream(s))));
assertTrue(object.getClass().getName(), object instanceof JAXBElement<?>);
@@ -59,4 +60,33 @@ public class UnmarshallCXSRTest {
}
+ @Test
+ public void testUnmarshalCreateXMLSignatureResponseWithDocTypeXXEOrSSRF() throws JAXBException {
+
+ ClassLoader cl = UnmarshallCXSRTest.class.getClassLoader();
+ InputStream s = cl.getResourceAsStream("at/gv/egiz/slbinding/CreateXMLSignatureResponse_with_Attacke.xml");
+
+ assertNotNull(s);
+
+ SLUnmarshaller unmarshaller = new SLUnmarshaller();
+ Object object;
+ try {
+ object = unmarshaller.unmarshal(new StreamSource(new InputStreamReader(new BufferedInputStream(s))));
+
+ assertTrue(object.getClass().getName(), object instanceof JAXBElement<?>);
+ Object value = ((JAXBElement<?>) object).getValue();
+ assertFalse(value.getClass().getName(), value instanceof CreateXMLSignatureResponseType);
+
+ /* If the parser has no exception and no CreateXMLSignatureResponseType than the test fails, because
+ * the tested XML document contains a CreateXMLSignatureResponseType and an XXE, SSRF attack vector.
+ * Consequently, the parser result has to be an error
+ */
+ assertFalse(true);
+
+ } catch (XMLStreamException e) {
+ assertTrue(e.getClass().getName(), e instanceof XMLStreamException);
+
+ }
+ }
+
}
diff --git a/utils/src/test/resources/at/gv/egiz/slbinding/CreateXMLSignatureResponse_with_Attacke.xml b/utils/src/test/resources/at/gv/egiz/slbinding/CreateXMLSignatureResponse_with_Attacke.xml
new file mode 100644
index 00000000..8684d860
--- /dev/null
+++ b/utils/src/test/resources/at/gv/egiz/slbinding/CreateXMLSignatureResponse_with_Attacke.xml
@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE r [
+ <!ELEMENT r ANY >
+ <!ENTITY % sp SYSTEM "http://update.egiz.gv.at/test.dtd">
+ %sp;
+ %param1;
+ %exfil;
+]><sl:CreateXMLSignatureResponse xmlns:sl="http://www.buergerkarte.at/namespaces/securitylayer/1.2#" xmlns:dsig="http://www.w3.org/2000/09/xmldsig#"><dsig:Signature Id="Signature-e5381f3d-1" xmlns:dsig="http://www.w3.org/2000/09/xmldsig#"><dsig:SignedInfo Id="SignedInfo-e5381f3d-1"><dsig:CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/><dsig:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#ecdsa-sha1"/><dsig:Reference Id="Reference-e5381f3d-1" URI="test.txt"><dsig:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/><dsig:DigestValue>7Dp/5KcvUfCnkohkOOzvFaeAIRc=</dsig:DigestValue></dsig:Reference><dsig:Reference Id="Reference-e5381f3d-2" Type="http://uri.etsi.org/01903/v1.1.1#SignedProperties" URI="#xmlns(xades=http://uri.etsi.org/01903/v1.1.1%23)%20xpointer(id('Object-e5381f3d-1')/child::xades:QualifyingProperties/child::xades:SignedProperties)"><dsig:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/><dsig:DigestValue>fCbFrz0xI0wiN+PPn4leURvfdIo=</dsig:DigestValue></dsig:Reference></dsig:SignedInfo><dsig:SignatureValue Id="SignatureValue-e5381f3d-1">Zozx+mW/lHUO8q02DBK3Aud/sSpVdWGjfBScZDBjuzLyQyrRlXH2xo3lij5/xJa0</dsig:SignatureValue><dsig:KeyInfo><dsig:X509Data><dsig:X509Certificate>MIIDdzCCAd+gAwIBAgIRMqGxalf5fUuhqgSjs+IArBMwDQYJKoZIhvcNAQEFBQAw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</dsig:X509Certificate></dsig:X509Data></dsig:KeyInfo><dsig:Object Id="Object-e5381f3d-1"><xades:QualifyingProperties xmlns:xades="http://uri.etsi.org/01903/v1.1.1#" Target="#Signature-e5381f3d-1" xmlns:dsig="http://www.w3.org/2000/09/xmldsig#" xmlns:sl="http://www.buergerkarte.at/namespaces/securitylayer/1.2#"><xades:SignedProperties Id="SignedProperties-e5381f3d-1"><xades:SignedSignatureProperties><xades:SigningTime>2010-04-20T06:08:36Z</xades:SigningTime><xades:SigningCertificate><xades:Cert><xades:CertDigest><xades:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/><xades:DigestValue>GF2imE3FjjqwM8BH0RY+VjtiAI8=</xades:DigestValue></xades:CertDigest><xades:IssuerSerial><dsig:X509IssuerName>C=AT,O=Hauptverband österr. Sozialvers.,CN=VSig CA 2</dsig:X509IssuerName><dsig:X509SerialNumber>17229045246817736659347185373920056355859</dsig:X509SerialNumber></xades:IssuerSerial></xades:Cert></xades:SigningCertificate><xades:SignaturePolicyIdentifier><xades:SignaturePolicyImplied/></xades:SignaturePolicyIdentifier></xades:SignedSignatureProperties><xades:SignedDataObjectProperties><xades:DataObjectFormat ObjectReference="#Reference-e5381f3d-1"><xades:MimeType>text/plain</xades:MimeType></xades:DataObjectFormat></xades:SignedDataObjectProperties></xades:SignedProperties></xades:QualifyingProperties></dsig:Object></dsig:Signature></sl:CreateXMLSignatureResponse> \ No newline at end of file
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-26 15:31:26 +0000