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Code Issues Releases Wiki Activity

Enfore max recursion depth and fix CRC test

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This commit is contained in:
Paul Schaub 2022-10-18 15:55:47 +02:00
parent 6324455cf5
commit 0a7c76a2dd
5 changed files with 66 additions and 22 deletions
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19
pgpainless-core/src/main/java/org/pgpainless/decryption_verification/MessageMetadata.java
View file

@ -7,6 +7,7 @@ package org.pgpainless.decryption_verification;
import org.pgpainless.algorithm.CompressionAlgorithm;
import org.pgpainless.algorithm.StreamEncoding;
import org.pgpainless.algorithm.SymmetricKeyAlgorithm;
import org.pgpainless.exception.MalformedOpenPgpMessageException;
import org.pgpainless.key.SubkeyIdentifier;
import org.pgpainless.util.SessionKey;
@ -202,6 +203,8 @@ public class MessageMetadata {
}
public abstract static class Layer {
public static final int MAX_LAYER_DEPTH = 16;
protected final int depth;
protected final List<SignatureVerification> verifiedDetachedSignatures = new ArrayList<>();
protected final List<SignatureVerification.Failure> rejectedDetachedSignatures = new ArrayList<>();
protected final List<SignatureVerification> verifiedOnePassSignatures = new ArrayList<>();
@ -210,6 +213,13 @@ public class MessageMetadata {
protected final List<SignatureVerification.Failure> rejectedPrependedSignatures = new ArrayList<>();
protected Nested child;
public Layer(int depth) {
this.depth = depth;
if (depth > MAX_LAYER_DEPTH) {
throw new MalformedOpenPgpMessageException("Maximum nesting depth exceeded.");
}
}
public Nested getChild() {
return child;
}
@ -274,6 +284,9 @@ public class MessageMetadata {
public static class Message extends Layer {
public Message() {
super(0);
}
}
public static class LiteralData implements Nested {
@ -312,7 +325,8 @@ public class MessageMetadata {
public static class CompressedData extends Layer implements Nested {
protected final CompressionAlgorithm algorithm;
public CompressedData(CompressionAlgorithm zip) {
public CompressedData(CompressionAlgorithm zip, int depth) {
super(depth);
this.algorithm = zip;
}
@ -332,7 +346,8 @@ public class MessageMetadata {
protected SessionKey sessionKey;
protected List<Long> recipients;
public EncryptedData(SymmetricKeyAlgorithm algorithm) {
public EncryptedData(SymmetricKeyAlgorithm algorithm, int depth) {
super(depth);
this.algorithm = algorithm;
}

39
pgpainless-core/src/main/java/org/pgpainless/decryption_verification/OpenPgpMessageInputStream.java
View file

@ -15,6 +15,7 @@ import java.util.List;
import java.util.Stack;
import javax.annotation.Nonnull;
import org.bouncycastle.bcpg.ArmoredInputStream;
import org.bouncycastle.bcpg.BCPGInputStream;
import org.bouncycastle.openpgp.PGPCompressedData;
import org.bouncycastle.openpgp.PGPEncryptedData;
@ -56,6 +57,7 @@ import org.pgpainless.key.protection.UnlockSecretKey;
import org.pgpainless.policy.Policy;
import org.pgpainless.signature.SignatureUtils;
import org.pgpainless.signature.consumer.SignatureValidator;
import org.pgpainless.util.ArmoredInputStreamFactory;
import org.pgpainless.util.Passphrase;
import org.pgpainless.util.SessionKey;
import org.pgpainless.util.Tuple;
@ -91,7 +93,7 @@ public class OpenPgpMessageInputStream extends DecryptionStream {
@Nonnull ConsumerOptions options,
@Nonnull Policy policy)
throws PGPException, IOException {
this(inputStream, options, new MessageMetadata.Message(), policy);
this(prepareInputStream(inputStream, options), options, new MessageMetadata.Message(), policy);
}
protected OpenPgpMessageInputStream(@Nonnull InputStream inputStream,
@ -118,6 +120,26 @@ public class OpenPgpMessageInputStream extends DecryptionStream {
consumePackets();
}
private static InputStream prepareInputStream(InputStream inputStream, ConsumerOptions options) throws IOException {
OpenPgpInputStream openPgpIn = new OpenPgpInputStream(inputStream);
openPgpIn.reset();
if (openPgpIn.isBinaryOpenPgp()) {
return openPgpIn;
}
if (openPgpIn.isAsciiArmored()) {
ArmoredInputStream armorIn = ArmoredInputStreamFactory.get(openPgpIn);
if (armorIn.isClearText()) {
return armorIn;
} else {
return armorIn;
}
} else {
return openPgpIn;
}
}
/**
* Consume OpenPGP packets from the current {@link BCPGInputStream}.
* Once an OpenPGP packet with nested data (Literal Data, Compressed Data, Encrypted Data) is reached,
@ -219,7 +241,8 @@ public class OpenPgpMessageInputStream extends DecryptionStream {
signatures.enterNesting();
PGPCompressedData compressedData = packetInputStream.readCompressedData();
MessageMetadata.CompressedData compressionLayer = new MessageMetadata.CompressedData(
CompressionAlgorithm.fromId(compressedData.getAlgorithm()));
CompressionAlgorithm.fromId(compressedData.getAlgorithm()),
metadata.depth + 1);
InputStream decompressed = compressedData.getDataStream();
nestedInputStream = new OpenPgpMessageInputStream(buffer(decompressed), options, compressionLayer, policy);
}
@ -262,7 +285,8 @@ public class OpenPgpMessageInputStream extends DecryptionStream {
SessionKeyDataDecryptorFactory decryptorFactory = ImplementationFactory.getInstance()
.getSessionKeyDataDecryptorFactory(sessionKey);
MessageMetadata.EncryptedData encryptedData = new MessageMetadata.EncryptedData(sessionKey.getAlgorithm());
MessageMetadata.EncryptedData encryptedData = new MessageMetadata.EncryptedData(
sessionKey.getAlgorithm(), metadata.depth + 1);
try {
// TODO: Use BCs new API once shipped
@ -301,7 +325,8 @@ public class OpenPgpMessageInputStream extends DecryptionStream {
InputStream decrypted = skesk.getDataStream(decryptorFactory);
SessionKey sessionKey = new SessionKey(skesk.getSessionKey(decryptorFactory));
throwIfUnacceptable(sessionKey.getAlgorithm());
MessageMetadata.EncryptedData encryptedData = new MessageMetadata.EncryptedData(sessionKey.getAlgorithm());
MessageMetadata.EncryptedData encryptedData = new MessageMetadata.EncryptedData(
sessionKey.getAlgorithm(), metadata.depth + 1);
encryptedData.sessionKey = sessionKey;
IntegrityProtectedInputStream integrityProtected = new IntegrityProtectedInputStream(decrypted, skesk, options);
nestedInputStream = new OpenPgpMessageInputStream(buffer(integrityProtected), options, encryptedData, policy);
@ -333,7 +358,8 @@ public class OpenPgpMessageInputStream extends DecryptionStream {
throwIfUnacceptable(sessionKey.getAlgorithm());
MessageMetadata.EncryptedData encryptedData = new MessageMetadata.EncryptedData(
SymmetricKeyAlgorithm.requireFromId(pkesk.getSymmetricAlgorithm(decryptorFactory)));
SymmetricKeyAlgorithm.requireFromId(pkesk.getSymmetricAlgorithm(decryptorFactory)),
metadata.depth + 1);
encryptedData.decryptionKey = new SubkeyIdentifier(decryptionKeys, decryptionKey.getKeyID());
encryptedData.sessionKey = sessionKey;
@ -361,7 +387,8 @@ public class OpenPgpMessageInputStream extends DecryptionStream {
throwIfUnacceptable(sessionKey.getAlgorithm());
MessageMetadata.EncryptedData encryptedData = new MessageMetadata.EncryptedData(
SymmetricKeyAlgorithm.requireFromId(pkesk.getSymmetricAlgorithm(decryptorFactory)));
SymmetricKeyAlgorithm.requireFromId(pkesk.getSymmetricAlgorithm(decryptorFactory)),
metadata.depth + 1);
encryptedData.decryptionKey = new SubkeyIdentifier(decryptionKeyCandidate.getA(), privateKey.getKeyID());
encryptedData.sessionKey = sessionKey;

20
pgpainless-core/src/test/java/org/bouncycastle/AsciiArmorCRCTests.java
View file

@ -489,7 +489,7 @@ public class AsciiArmorCRCTests {
Passphrase passphrase = Passphrase.fromPassword("flowcrypt compatibility tests");
@Test
public void testInvalidArmorCRCThrowsOnClose() throws PGPException, IOException {
public void testInvalidArmorCRCThrowsOnClose() throws IOException {
String message = "-----BEGIN PGP MESSAGE-----\n" +
"Version: FlowCrypt 5.0.4 Gmail Encryption flowcrypt.com\n" +
"Comment: Seamlessly send, receive and search encrypted email\n" +
@ -542,14 +542,16 @@ public class AsciiArmorCRCTests {
"-----END PGP MESSAGE-----\n";
PGPSecretKeyRing key = PGPainless.readKeyRing().secretKeyRing(ASCII_KEY);
DecryptionStream decryptionStream = PGPainless.decryptAndOrVerify()
.onInputStream(new ByteArrayInputStream(message.getBytes(StandardCharsets.UTF_8)))
.withOptions(new ConsumerOptions().addDecryptionKey(
key, SecretKeyRingProtector.unlockAnyKeyWith(passphrase)
));
assertThrows(IOException.class, () -> {
DecryptionStream decryptionStream = PGPainless.decryptAndOrVerify()
.onInputStream(new ByteArrayInputStream(message.getBytes(StandardCharsets.UTF_8)))
.withOptions(new ConsumerOptions().addDecryptionKey(
key, SecretKeyRingProtector.unlockAnyKeyWith(passphrase)
));
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
Streams.pipeAll(decryptionStream, outputStream);
assertThrows(IOException.class, decryptionStream::close);
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
Streams.pipeAll(decryptionStream, outputStream);
decryptionStream.close();
});
}
}

6
pgpainless-core/src/test/java/org/pgpainless/decryption_verification/MessageMetadataTest.java
View file

@ -28,9 +28,9 @@ public class MessageMetadataTest {
// For the sake of testing though, this is okay.
MessageMetadata.Message message = new MessageMetadata.Message();
MessageMetadata.CompressedData compressedData = new MessageMetadata.CompressedData(CompressionAlgorithm.ZIP);
MessageMetadata.EncryptedData encryptedData = new MessageMetadata.EncryptedData(SymmetricKeyAlgorithm.AES_128);
MessageMetadata.EncryptedData encryptedData1 = new MessageMetadata.EncryptedData(SymmetricKeyAlgorithm.AES_256);
MessageMetadata.CompressedData compressedData = new MessageMetadata.CompressedData(CompressionAlgorithm.ZIP, message.depth + 1);
MessageMetadata.EncryptedData encryptedData = new MessageMetadata.EncryptedData(SymmetricKeyAlgorithm.AES_128, compressedData.depth + 1);
MessageMetadata.EncryptedData encryptedData1 = new MessageMetadata.EncryptedData(SymmetricKeyAlgorithm.AES_256, encryptedData.depth + 1);
MessageMetadata.LiteralData literalData = new MessageMetadata.LiteralData();
message.setChild(compressedData);

4
pgpainless-core/src/test/java/org/pgpainless/decryption_verification/RecursionDepthTest.java
View file

@ -11,12 +11,12 @@ import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import org.bouncycastle.openpgp.PGPException;
import org.bouncycastle.openpgp.PGPSecretKeyRing;
import org.bouncycastle.util.io.Streams;
import org.junit.jupiter.api.TestTemplate;
import org.junit.jupiter.api.extension.ExtendWith;
import org.pgpainless.PGPainless;
import org.pgpainless.exception.MalformedOpenPgpMessageException;
import org.pgpainless.util.TestAllImplementations;
public class RecursionDepthTest {
@ -143,7 +143,7 @@ public class RecursionDepthTest {
"-----END PGP ARMORED FILE-----\n";
assertThrows(PGPException.class, () -> {
assertThrows(MalformedOpenPgpMessageException.class, () -> {
DecryptionStream decryptionStream = PGPainless.decryptAndOrVerify()
.onInputStream(new ByteArrayInputStream(msg.getBytes(StandardCharsets.UTF_8)))
.withOptions(new ConsumerOptions().addDecryptionKey(secretKey));