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[YouTube] Secure DashManifestCreator against XEE attack 

Also remove duplicate lines from javadoc comments, otherwise checkstyle complaints.
XEE prevention is inspired from https://github.com/ChuckerTeam/chucker/pull/201/files
For an explanation of XEE see https://rules.sonarsource.com/java/RSPEC-2755, though the solution reported there causes crashes on Android
This commit is contained in:
Stypox 2022-04-30 21:24:58 +02:00 committed by TiA4f8R
parent 159d05c91b
commit ba68b8c014
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1 changed files with 68 additions and 54 deletions
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122
extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/YoutubeDashManifestCreator.java
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@ -13,10 +13,13 @@ import org.w3c.dom.Document;
import org.w3c.dom.Element;
import javax.annotation.Nonnull;
import javax.xml.XMLConstants;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
@ -45,10 +48,7 @@ import static org.schabi.newpipe.extractor.utils.Utils.isNullOrEmpty;
/**
* Class to generate DASH manifests from YouTube OTF, progressive and ended/post-live-DVR streams.
*
* <p>
* It relies on external classes from the {@link org.w3c.dom} and {@link javax.xml} packages.
* </p>
*/
public final class YoutubeDashManifestCreator {
@ -305,7 +305,7 @@ public final class YoutubeDashManifestCreator {
SEGMENTS_DURATION.clear();
DURATION_REPETITIONS.clear();
return buildResult(otfBaseStreamingUrl, document, GENERATED_OTF_MANIFESTS);
return buildAndCacheResult(otfBaseStreamingUrl, document, GENERATED_OTF_MANIFESTS);
}
/**
@ -441,7 +441,7 @@ public final class YoutubeDashManifestCreator {
generateSegmentTimelineElement(document);
generateSegmentElementForPostLiveDvrStreams(document, targetDurationSec, segmentCount);
return buildResult(postLiveStreamDvrStreamingUrl, document,
return buildAndCacheResult(postLiveStreamDvrStreamingUrl, document,
GENERATED_POST_LIVE_DVR_STREAMS_MANIFESTS);
}
@ -533,7 +533,7 @@ public final class YoutubeDashManifestCreator {
generateSegmentBaseElement(document, itagItem);
generateInitializationElement(document, itagItem);
return buildResult(progressiveStreamingBaseUrl, document,
return buildAndCacheResult(progressiveStreamingBaseUrl, document,
GENERATED_PROGRESSIVE_STREAMS_MANIFESTS);
}
@ -841,13 +841,8 @@ public final class YoutubeDashManifestCreator {
@Nonnull final ItagItem itagItem,
final long durationSecondsFallback)
throws YoutubeDashManifestCreationException {
final DocumentBuilderFactory documentBuilderFactory;
final DocumentBuilder documentBuilder;
final Document document;
try {
documentBuilderFactory = DocumentBuilderFactory.newInstance();
documentBuilder = documentBuilderFactory.newDocumentBuilder();
document = documentBuilder.newDocument();
final Document document = newDocument();
final Element mpdElement = document.createElement("MPD");
document.appendChild(mpdElement);
@ -903,13 +898,13 @@ public final class YoutubeDashManifestCreator {
final String durationSeconds = String.format(Locale.ENGLISH, "%.3f", duration);
mediaPresentationDurationAttribute.setValue("PT" + durationSeconds + "S");
mpdElement.setAttributeNode(mediaPresentationDurationAttribute);
return document;
} catch (final Exception e) {
throw new YoutubeDashManifestCreationException(
"Could not generate or append the MPD element of the DASH manifest to the "
+ "document", e);
}
return document;
}
/**
@ -1591,7 +1586,7 @@ public final class YoutubeDashManifestCreator {
}
/**
* Convert a DASH manifest {@link Document document} to a string.
* Convert a DASH manifest {@link Document document} to a string and cache it.
*
* @param originalBaseStreamingUrl the original base URL of the stream
* @param document the document to be converted
@ -1604,23 +1599,16 @@ public final class YoutubeDashManifestCreator {
* @throws YoutubeDashManifestCreationException if something goes wrong when converting the
* {@link Document document}
*/
private static String buildResult(
private static String buildAndCacheResult(
@Nonnull final String originalBaseStreamingUrl,
@Nonnull final Document document,
@Nonnull final ManifestCreatorCache<String, String> manifestCreatorCache)
throws YoutubeDashManifestCreationException {
try {
final StringWriter result = new StringWriter();
final TransformerFactory transformerFactory = TransformerFactory.newInstance();
final Transformer transformer = transformerFactory.newTransformer();
transformer.setOutputProperty(OutputKeys.VERSION, "1.0");
transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
transformer.setOutputProperty(OutputKeys.STANDALONE, "no");
transformer.transform(new DOMSource(document), new StreamResult(result));
final String stringResult = result.toString();
manifestCreatorCache.put(originalBaseStreamingUrl, stringResult);
return stringResult;
try {
final String documentXml = documentToXml(document);
manifestCreatorCache.put(originalBaseStreamingUrl, documentXml);
return documentXml;
} catch (final Exception e) {
throw new YoutubeDashManifestCreationException(
"Could not convert the DASH manifest generated to a string", e);
@ -1628,8 +1616,54 @@ public final class YoutubeDashManifestCreator {
}
/**
* Get the number of cached OTF streams manifests.
* Securing against XEE is done by passing {@code false} to {@link
* DocumentBuilderFactory#setExpandEntityReferences(boolean)}, also see
* <a href="https://github.com/ChuckerTeam/chucker/pull/201">ChuckerTeam/chucker#201</a>.
*
* @return an instance of document secured against XEE attacks, that should then be convertible
* to an XML string without security problems
* @see #documentToXml(Document) Use documentToXml to convert the created document to XML, which
* is also secured against XEE!
*/
private static Document newDocument() throws ParserConfigurationException {
final DocumentBuilderFactory documentBuilderFactory
= DocumentBuilderFactory.newInstance();
documentBuilderFactory.setExpandEntityReferences(false);
final DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
return documentBuilder.newDocument();
}
/**
* Securing against XEE is done by setting {@link XMLConstants#FEATURE_SECURE_PROCESSING} to
* {@code true} in the {@link TransformerFactory}, also see
* <a href="https://github.com/ChuckerTeam/chucker/pull/201">ChuckerTeam/chucker#201</a>.
* The best way to do this would be setting the attributes {@link
* XMLConstants#ACCESS_EXTERNAL_DTD} and {@link XMLConstants#ACCESS_EXTERNAL_STYLESHEET}, but
* unfortunately the engine on Android does not support them.
*
* @param document the document to convert; must have been created using {@link #newDocument()}
* to properly prevent XEE attacks!
* @return the document converted to an XML string, making sure there can't be XEE attacks
*/
private static String documentToXml(@Nonnull final Document document)
throws TransformerException {
final TransformerFactory transformerFactory = TransformerFactory.newInstance();
transformerFactory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true);
final Transformer transformer = transformerFactory.newTransformer();
transformer.setOutputProperty(OutputKeys.VERSION, "1.0");
transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
transformer.setOutputProperty(OutputKeys.STANDALONE, "no");
final StringWriter result = new StringWriter();
transformer.transform(new DOMSource(document), new StreamResult(result));
return result.toString();
}
/**
* @return the number of cached OTF streams manifests
*/
public static int getOtfCachedManifestsSize() {
@ -1637,8 +1671,6 @@ public final class YoutubeDashManifestCreator {
}
/**
* Get the number of cached post-live-DVR streams manifests.
*
* @return the number of cached post-live-DVR streams manifests
*/
public static int getPostLiveDvrStreamsCachedManifestsSize() {
@ -1646,8 +1678,6 @@ public final class YoutubeDashManifestCreator {
}
/**
* Get the number of cached progressive manifests.
*
* @return the number of cached progressive manifests
*/
public static int getProgressiveStreamsCachedManifestsSize() {
@ -1655,8 +1685,6 @@ public final class YoutubeDashManifestCreator {
}
/**
* Get the number of cached OTF, post-live-DVR streams and progressive manifests.
*
* @return the number of cached OTF, post-live-DVR streams and progressive manifests.
*/
public static int getSizeOfManifestsCaches() {
@ -1666,8 +1694,6 @@ public final class YoutubeDashManifestCreator {
}
/**
* Get the clear factor of OTF streams manifests cache.
*
* @return the clear factor of OTF streams manifests cache.
*/
public static double getOtfStreamsClearFactor() {
@ -1675,8 +1701,6 @@ public final class YoutubeDashManifestCreator {
}
/**
* Get the clear factor of post-live-DVR streams manifests cache.
*
* @return the clear factor of post-live-DVR streams manifests cache.
*/
public static double getPostLiveDvrStreamsClearFactor() {
@ -1684,8 +1708,6 @@ public final class YoutubeDashManifestCreator {
}
/**
* Get the clear factor of progressive streams manifests cache.
*
* @return the clear factor of progressive streams manifests cache.
*/
public static double getProgressiveStreamsClearFactor() {
@ -1693,8 +1715,6 @@ public final class YoutubeDashManifestCreator {
}
/**
* Set the clear factor of cached OTF streams.
*
* @param otfStreamsClearFactor the clear factor of OTF streams manifests cache.
*/
public static void setOtfStreamsClearFactor(final double otfStreamsClearFactor) {
@ -1702,10 +1722,8 @@ public final class YoutubeDashManifestCreator {
}
/**
* Set the clear factor of cached post-live-DVR streams.
*
* @param postLiveDvrStreamsClearFactor the clear factor of post-live-DVR streams manifests
* cache.
* @param postLiveDvrStreamsClearFactor the clear factor to set for post-live-DVR streams
* manifests cache
*/
public static void setPostLiveDvrStreamsClearFactor(
final double postLiveDvrStreamsClearFactor) {
@ -1713,10 +1731,8 @@ public final class YoutubeDashManifestCreator {
}
/**
* Set the clear factor of cached progressive streams.
*
* @param progressiveStreamsClearFactor the clear factor of progressive streams manifests
* cache.
* @param progressiveStreamsClearFactor the clear factor to set for progressive streams
* manifests cache
*/
public static void setProgressiveStreamsClearFactor(
final double progressiveStreamsClearFactor) {
@ -1724,10 +1740,8 @@ public final class YoutubeDashManifestCreator {
}
/**
* Set the clear factor of cached OTF, post-live-DVR and progressive streams.
*
* @param cachesClearFactor the clear factor of OTF, post-live-DVR and progressive streams
* manifests caches.
* @param cachesClearFactor the clear factor to set for OTF, post-live-DVR and progressive
* streams manifests caches
*/
public static void setCachesClearFactor(final double cachesClearFactor) {
GENERATED_OTF_MANIFESTS.setClearFactor(cachesClearFactor);