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Add method to allow for encryption for keys with missing keyflags.

There are legacy keys around, which do not carry any key flags.
This commit adds a method to EncryptionOptions that allow PGPainless to encrypt
for such keys.

Fixes #400
This commit is contained in:
Paul Schaub 2023-08-03 14:04:40 +02:00
parent 0d8db24b1a
commit 975d59c5a9
Signed by: vanitasvitae
GPG key ID: 62BEE9264BF17311
3 changed files with 220 additions and 3 deletions

View file

@ -67,6 +67,7 @@ public class EncryptionOptions {
private final Map<SubkeyIdentifier, KeyRingInfo> keyRingInfo = new HashMap<>();
private final Map<SubkeyIdentifier, KeyAccessor> keyViews = new HashMap<>();
private final EncryptionKeySelector encryptionKeySelector = encryptToAllCapableSubkeys();
private boolean allowEncryptionWithMissingKeyFlags = false;
private SymmetricKeyAlgorithm encryptionAlgorithmOverride = null;
@ -277,8 +278,7 @@ public class EncryptionOptions {
private EncryptionOptions addAsRecipient(PGPPublicKeyRing key, EncryptionKeySelector encryptionKeySelectionStrategy, boolean wildcardKeyId) {
Date evaluationDate = new Date();
KeyRingInfo info;
info = new KeyRingInfo(key, evaluationDate);
KeyRingInfo info = new KeyRingInfo(key, evaluationDate);
Date primaryKeyExpiration;
try {
@ -292,6 +292,23 @@ public class EncryptionOptions {
List<PGPPublicKey> encryptionSubkeys = encryptionKeySelectionStrategy
.selectEncryptionSubkeys(info.getEncryptionSubkeys(purpose));
// There are some legacy keys around without key flags.
// If we allow encryption for those keys, we add valid keys without any key flags, if they are
// capable of encryption by means of their algorithm
if (encryptionSubkeys.isEmpty() && allowEncryptionWithMissingKeyFlags) {
List<PGPPublicKey> validSubkeys = info.getValidSubkeys();
for (PGPPublicKey validSubkey : validSubkeys) {
if (!validSubkey.isEncryptionKey()) {
continue;
}
// only add encryption keys with no key flags.
if (info.getKeyFlagsOf(validSubkey.getKeyID()).isEmpty()) {
encryptionSubkeys.add(validSubkey);
}
}
}
if (encryptionSubkeys.isEmpty()) {
throw new KeyException.UnacceptableEncryptionKeyException(OpenPgpFingerprint.of(key));
}
@ -386,6 +403,19 @@ public class EncryptionOptions {
return this;
}
/**
* If this method is called, subsequent calls to {@link #addRecipient(PGPPublicKeyRing)} will allow encryption
* for subkeys that do not carry any {@link org.pgpainless.algorithm.KeyFlag} subpacket.
* This is a workaround for dealing with legacy keys that have no key flags subpacket but rely on the key algorithm
* type to convey the subkeys use.
*
* @return this
*/
public EncryptionOptions setAllowEncryptionWithMissingKeyFlags() {
this.allowEncryptionWithMissingKeyFlags = true;
return this;
}
/**
* Return <pre>true</pre> iff the user specified at least one encryption method,
* <pre>false</pre> otherwise.

View file

@ -60,7 +60,7 @@ public class KeyRingBuilder implements KeyRingBuilderInterface<KeyRingBuilder> {
private final List<KeySpec> subkeySpecs = new ArrayList<>();
private final Map<String, SelfSignatureSubpackets.Callback> userIds = new LinkedHashMap<>();
private Passphrase passphrase = Passphrase.emptyPassphrase();
private Date expirationDate = new Date(System.currentTimeMillis() + YEAR_IN_SECONDS * 5); // Expiration in 5 yeras
private Date expirationDate = new Date(System.currentTimeMillis() + YEAR_IN_SECONDS * 5); // Expiration in 5 years
@Override
public KeyRingBuilder setPrimaryKey(@Nonnull KeySpec keySpec) {

View file

@ -0,0 +1,187 @@
// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
//
// SPDX-License-Identifier: Apache-2.0
package org.pgpainless.encryption_signing;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import org.bouncycastle.openpgp.PGPException;
import org.bouncycastle.openpgp.PGPPublicKeyRing;
import org.bouncycastle.openpgp.PGPSecretKeyRing;
import org.bouncycastle.util.io.Streams;
import org.junit.jupiter.api.Test;
import org.pgpainless.PGPainless;
import org.pgpainless.decryption_verification.ConsumerOptions;
import org.pgpainless.decryption_verification.DecryptionStream;
import org.pgpainless.decryption_verification.MessageMetadata;
import org.pgpainless.exception.KeyException;
public class EncryptionWithMissingKeyFlagsTest {
private static final String KEY_WITHOUT_KEY_FLAGS = "-----BEGIN PGP PRIVATE KEY BLOCK-----\n" +
"Version: PGPainless\n" +
"Comment: A991 A732 9021 7D2D 1250 93C3 2503 6033 1D81 E264\n" +
"Comment: Test <test@example.org>\n" +
"\n" +
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"=TKhx\n" +
"-----END PGP PRIVATE KEY BLOCK-----";
private static final String MESSAGE = "Hello, World!\n";
@Test
public void testEncryptionForKeyWithoutKeyFlagsFailsByDefault()
throws IOException {
PGPSecretKeyRing secretKeys = PGPainless.readKeyRing()
.secretKeyRing(KEY_WITHOUT_KEY_FLAGS);
PGPPublicKeyRing publicKeys = PGPainless.extractCertificate(secretKeys);
assertThrows(KeyException.UnacceptableEncryptionKeyException.class, () ->
EncryptionOptions.get().addRecipient(publicKeys));
}
@Test
public void testEncryptionForKeyWithoutKeyFlagsSucceedsWithActiveWorkaround()
throws PGPException, IOException {
PGPSecretKeyRing secretKeys = PGPainless.readKeyRing()
.secretKeyRing(KEY_WITHOUT_KEY_FLAGS);
PGPPublicKeyRing publicKeys = PGPainless.extractCertificate(secretKeys);
// Prepare encryption
ByteArrayOutputStream out = new ByteArrayOutputStream();
EncryptionStream encOut = PGPainless.encryptAndOrSign()
.onOutputStream(out)
.withOptions(ProducerOptions.encrypt(EncryptionOptions.get()
.setAllowEncryptionWithMissingKeyFlags() // Workaround
.addRecipient(publicKeys)));
// Encrypt
encOut.write(MESSAGE.getBytes(StandardCharsets.UTF_8));
encOut.close();
// Prepare decryption
ByteArrayInputStream in = new ByteArrayInputStream(out.toByteArray());
DecryptionStream decryptionStream = PGPainless.decryptAndOrVerify()
.onInputStream(in)
.withOptions(ConsumerOptions.get().addDecryptionKey(secretKeys));
ByteArrayOutputStream plain = new ByteArrayOutputStream();
// Decrypt
Streams.pipeAll(decryptionStream, plain);
decryptionStream.close();
// Check result
assertEquals(MESSAGE, plain.toString());
MessageMetadata metadata = decryptionStream.getMetadata();
assertTrue(metadata.isEncryptedFor(publicKeys));
}
}