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Code Issues Releases Wiki Activity

Introduce iteration limit to prevent resource exhaustion when reading signatures

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This commit is contained in:
Paul Schaub 2021-12-06 17:11:23 +01:00
parent 073cf870d2
commit c4618617f6
Signed by: vanitasvitae
GPG key ID: 62BEE9264BF17311
1 changed files with 18 additions and 1 deletions
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19
pgpainless-core/src/main/java/org/pgpainless/signature/SignatureUtils.java
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@ -43,6 +43,8 @@ import org.pgpainless.util.ArmorUtils;
*/ */
public final class SignatureUtils { public final class SignatureUtils {
public static final int MAX_ITERATIONS = 10000;
private SignatureUtils() { private SignatureUtils() {
} }
@ -220,13 +222,28 @@ public final class SignatureUtils {
* @throws PGPException in case of an OpenPGP error * @throws PGPException in case of an OpenPGP error
*/ */
public static List<PGPSignature> readSignatures(InputStream inputStream) throws IOException, PGPException { public static List<PGPSignature> readSignatures(InputStream inputStream) throws IOException, PGPException {
return readSignatures(inputStream, MAX_ITERATIONS);
}
/**
* Read and return {@link PGPSignature PGPSignatures}.
* This method can deal with signatures that may be armored, compressed and may contain marker packets.
*
* @param inputStream input stream
* @param maxIterations number of loop iterations until reading is aborted
* @return list of encountered signatures
* @throws IOException in case of a stream error
* @throws PGPException in case of an OpenPGP error
*/
public static List<PGPSignature> readSignatures(InputStream inputStream, int maxIterations) throws IOException, PGPException {
List<PGPSignature> signatures = new ArrayList<>(); List<PGPSignature> signatures = new ArrayList<>();
InputStream pgpIn = ArmorUtils.getDecoderStream(inputStream); InputStream pgpIn = ArmorUtils.getDecoderStream(inputStream);
PGPObjectFactory objectFactory = new PGPObjectFactory( PGPObjectFactory objectFactory = new PGPObjectFactory(
pgpIn, ImplementationFactory.getInstance().getKeyFingerprintCalculator()); pgpIn, ImplementationFactory.getInstance().getKeyFingerprintCalculator());
int i = 0;
Object nextObject; Object nextObject;
while ((nextObject = objectFactory.nextObject()) != null) { while (i++ < maxIterations && (nextObject = objectFactory.nextObject()) != null) {
if (nextObject instanceof PGPCompressedData) { if (nextObject instanceof PGPCompressedData) {
PGPCompressedData compressedData = (PGPCompressedData) nextObject; PGPCompressedData compressedData = (PGPCompressedData) nextObject;
objectFactory = new PGPObjectFactory(compressedData.getDataStream(), objectFactory = new PGPObjectFactory(compressedData.getDataStream(),