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Throw nasty warnings if JAXP 1.5 support isn't present

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- JAXP 1.5 allows us to check for XML XXE/OOB malicious tricks
 - Fixes #1553
This commit is contained in:
Connor Tumbleson 2017-07-17 14:12:14 -04:00
parent 98138b2b92
commit dbb144f9af
1 changed files with 9 additions and 3 deletions
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12
brut.apktool/apktool-lib/src/main/java/brut/androlib/res/xml/ResXmlPatcher.java
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@ -19,8 +19,8 @@ package brut.androlib.res.xml;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.logging.Logger;
import javax.xml.XMLConstants;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
@ -264,8 +264,12 @@ public final class ResXmlPatcher {
docFactory.setFeature(FEATURE_DISABLE_DOCTYPE_DECL, true);
docFactory.setFeature(FEATURE_LOAD_DTD, false);
docFactory.setAttribute(ACCESS_EXTERNAL_DTD, " ");
docFactory.setAttribute(ACCESS_EXTERNAL_SCHEMA, " ");
try {
docFactory.setAttribute(ACCESS_EXTERNAL_DTD, " ");
docFactory.setAttribute(ACCESS_EXTERNAL_SCHEMA, " ");
} catch (IllegalArgumentException ex) {
LOGGER.warning("JAXP 1.5 Support is required to validate XML");
}
DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
// Not using the parse(File) method on purpose, so that we can control when
@ -301,4 +305,6 @@ public final class ResXmlPatcher {
private static final String ACCESS_EXTERNAL_SCHEMA = "http://javax.xml.XMLConstants/property/accessExternalSchema";
private static final String FEATURE_LOAD_DTD = "http://apache.org/xml/features/nonvalidating/load-external-dtd";
private static final String FEATURE_DISABLE_DOCTYPE_DECL = "http://apache.org/xml/features/disallow-doctype-decl";
private static final Logger LOGGER = Logger.getLogger(ResXmlPatcher.class.getName());
}