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Code Issues Releases Wiki Activity

Verify sub key signatures

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This commit is contained in:
Paul Schaub 2018-07-11 14:17:04 +02:00
parent 260ecaaea3
commit 154a2b832f
Signed by: vanitasvitae
GPG key ID: 62BEE9264BF17311
3 changed files with 44 additions and 17 deletions
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19
src/main/java/org/pgpainless/pgpainless/key/selection/key/impl/SignedByMasterKey.java
View file

@ -15,6 +15,8 @@
*/
package org.pgpainless.pgpainless.key.selection.key.impl;
import java.io.IOException;
import java.util.Arrays;
import java.util.Iterator;
import java.util.logging.Level;
import java.util.logging.Logger;
@ -22,25 +24,32 @@ import java.util.logging.Logger;
import org.bouncycastle.openpgp.PGPException;
import org.bouncycastle.openpgp.PGPPublicKey;
import org.bouncycastle.openpgp.PGPSignature;
import org.bouncycastle.openpgp.operator.bc.BcPGPContentVerifierBuilderProvider;
import org.pgpainless.pgpainless.key.selection.key.PublicKeySelectionStrategy;
public class SignedByMasterKey {
private static final Logger LOGGER = Logger.getLogger(SignedByMasterKey.class.getName());
public static class PubkeySelectionStrategy extends PublicKeySelectionStrategy<Long> {
public static class PubkeySelectionStrategy extends PublicKeySelectionStrategy<PGPPublicKey> {
@Override
public boolean accept(Long identifier, PGPPublicKey key) {
Iterator<PGPSignature> signatures = key.getSignaturesForKeyID(identifier);
public boolean accept(PGPPublicKey masterKey, PGPPublicKey key) {
// Same key -> accept
if (Arrays.equals(masterKey.getFingerprint(), key.getFingerprint())) {
return true;
}
Iterator<PGPSignature> signatures = key.getSignaturesForKeyID(masterKey.getKeyID());
while (signatures.hasNext()) {
PGPSignature signature = signatures.next();
if (signature.getSignatureType() == PGPSignature.SUBKEY_BINDING) {
try {
return signature.verify();
signature.init(new BcPGPContentVerifierBuilderProvider(), masterKey);
return signature.verifyCertification(masterKey, key);
} catch (PGPException e) {
LOGGER.log(Level.WARNING, "Could not verify subkey signature of key " +
Long.toHexString(signature.getKeyID()) + " on key " + Long.toHexString(key.getKeyID()));
Long.toHexString(masterKey.getKeyID()) + " on key " + Long.toHexString(key.getKeyID()));
return false;
}

27
src/main/java/org/pgpainless/pgpainless/util/BCUtil.java
View file

@ -107,7 +107,8 @@ public class BCUtil {
public static PGPPublicKeyRing getKeyRingFromCollection(PGPPublicKeyRingCollection collection, Long id)
throws PGPException {
return removeUnassociatedKeysFromKeyRing(collection.getPublicKeyRing(id), id);
PGPPublicKey key = collection.getPublicKey(id);
return removeUnassociatedKeysFromKeyRing(collection.getPublicKeyRing(id), key);
}
public static InputStream getPgpDecoderInputStream(byte[] bytes) throws IOException {
@ -135,13 +136,15 @@ public class BCUtil {
* (identified by {@code masterKeyId}), or are revoked ("normal" key revocation, as well as subkey revocation).
*
* @param ring key ring
* @param masterKeyId id of the master key
* @param masterKey master key
* @return "cleaned" key ring
*/
public static PGPPublicKeyRing removeUnassociatedKeysFromKeyRing(PGPPublicKeyRing ring, Long masterKeyId) {
public static PGPPublicKeyRing removeUnassociatedKeysFromKeyRing(PGPPublicKeyRing ring, PGPPublicKey masterKey) {
if (!masterKey.isMasterKey()) {
throw new IllegalArgumentException("Given key is not a master key.");
}
// Only select keys which are signed by the master key and not revoked.
PublicKeySelectionStrategy<Long> selector = new And.PubKeySelectionStrategy<>(
PublicKeySelectionStrategy<PGPPublicKey> selector = new And.PubKeySelectionStrategy<>(
new SignedByMasterKey.PubkeySelectionStrategy(),
new NoRevocation.PubKeySelectionStrategy<>());
@ -150,7 +153,7 @@ public class BCUtil {
Iterator<PGPPublicKey> publicKeys = ring.getPublicKeys();
while (publicKeys.hasNext()) {
PGPPublicKey publicKey = publicKeys.next();
if (!selector.accept(masterKeyId, publicKey)) {
if (!selector.accept(masterKey, publicKey)) {
cleaned = PGPPublicKeyRing.removePublicKey(cleaned, publicKey);
}
}
@ -163,13 +166,15 @@ public class BCUtil {
* (identified by {@code masterKeyId}), or are revoked ("normal" key revocation, as well as subkey revocation).
*
* @param ring key ring
* @param masterKeyId id of the master key
* @param masterKey master key
* @return "cleaned" key ring
*/
public static PGPSecretKeyRing removeUnassociatedKeysFromKeyRing(PGPSecretKeyRing ring, Long masterKeyId) {
public static PGPSecretKeyRing removeUnassociatedKeysFromKeyRing(PGPSecretKeyRing ring, PGPPublicKey masterKey) {
if (!masterKey.isMasterKey()) {
throw new IllegalArgumentException("Given key is not a master key.");
}
// Only select keys which are signed by the master key and not revoked.
PublicKeySelectionStrategy<Long> selector = new And.PubKeySelectionStrategy<>(
PublicKeySelectionStrategy<PGPPublicKey> selector = new And.PubKeySelectionStrategy<>(
new SignedByMasterKey.PubkeySelectionStrategy(),
new NoRevocation.PubKeySelectionStrategy<>());
@ -178,7 +183,7 @@ public class BCUtil {
Iterator<PGPSecretKey> secretKeys = ring.getSecretKeys();
while (secretKeys.hasNext()) {
PGPSecretKey secretKey = secretKeys.next();
if (!selector.accept(masterKeyId, secretKey.getPublicKey())) {
if (!selector.accept(masterKey, secretKey.getPublicKey())) {
cleaned = PGPSecretKeyRing.removeSecretKey(cleaned, secretKey);
}
}

15
src/test/java/org/pgpainless/pgpainless/BCUtilTest.java
View file

@ -18,11 +18,13 @@ package org.pgpainless.pgpainless;
import static junit.framework.TestCase.assertEquals;
import static junit.framework.TestCase.assertNotNull;
import static junit.framework.TestCase.assertNull;
import static junit.framework.TestCase.assertTrue;
import java.io.IOException;
import java.security.InvalidAlgorithmParameterException;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.util.Arrays;
import java.util.Iterator;
import java.util.logging.Level;
import java.util.logging.Logger;
@ -119,7 +121,18 @@ public class BCUtilTest extends AbstractPGPainlessTest {
// Check, if alice_mallory contains mallory's key
assertNotNull(alice_mallory.getSecretKey(subKey.getKeyID()));
PGPSecretKeyRing cleaned = BCUtil.removeUnassociatedKeysFromKeyRing(alice_mallory, alice.getPublicKey().getKeyID());
PGPSecretKeyRing cleaned = BCUtil.removeUnassociatedKeysFromKeyRing(alice_mallory, alice.getPublicKey());
assertNull(cleaned.getSecretKey(subKey.getKeyID()));
}
@Test
public void removeUnsignedKeysECTest()
throws PGPException, NoSuchAlgorithmException, NoSuchProviderException, InvalidAlgorithmParameterException,
IOException {
PGPSecretKeyRing alice = PGPainless.generateKeyRing().simpleEcKeyRing("alice@wonderland.lit");
PGPSecretKeyRing after = BCUtil.removeUnassociatedKeysFromKeyRing(alice, alice.getPublicKey());
assertTrue(Arrays.equals(alice.getEncoded(), after.getEncoded()));
}
}