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:
parent
0d8db24b1a
commit
975d59c5a9
GPG Key ID:
62BEE9264BF17311
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@ -67,6 +67,7 @@ public class EncryptionOptions {
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private final Map<SubkeyIdentifier, KeyRingInfo> keyRingInfo = new HashMap<>();
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private final Map<SubkeyIdentifier, KeyAccessor> keyViews = new HashMap<>();
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private final EncryptionKeySelector encryptionKeySelector = encryptToAllCapableSubkeys();
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private boolean allowEncryptionWithMissingKeyFlags = false;
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private SymmetricKeyAlgorithm encryptionAlgorithmOverride = null;
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@ -277,8 +278,7 @@ public class EncryptionOptions {
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private EncryptionOptions addAsRecipient(PGPPublicKeyRing key, EncryptionKeySelector encryptionKeySelectionStrategy, boolean wildcardKeyId) {
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Date evaluationDate = new Date();
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KeyRingInfo info;
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info = new KeyRingInfo(key, evaluationDate);
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KeyRingInfo info = new KeyRingInfo(key, evaluationDate);
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Date primaryKeyExpiration;
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try {
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@ -292,6 +292,23 @@ public class EncryptionOptions {
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List<PGPPublicKey> encryptionSubkeys = encryptionKeySelectionStrategy
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.selectEncryptionSubkeys(info.getEncryptionSubkeys(purpose));
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// There are some legacy keys around without key flags.
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// If we allow encryption for those keys, we add valid keys without any key flags, if they are
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// capable of encryption by means of their algorithm
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if (encryptionSubkeys.isEmpty() && allowEncryptionWithMissingKeyFlags) {
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List<PGPPublicKey> validSubkeys = info.getValidSubkeys();
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for (PGPPublicKey validSubkey : validSubkeys) {
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if (!validSubkey.isEncryptionKey()) {
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continue;
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}
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// only add encryption keys with no key flags.
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if (info.getKeyFlagsOf(validSubkey.getKeyID()).isEmpty()) {
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encryptionSubkeys.add(validSubkey);
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}
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}
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}
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if (encryptionSubkeys.isEmpty()) {
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throw new KeyException.UnacceptableEncryptionKeyException(OpenPgpFingerprint.of(key));
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}
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@ -386,6 +403,19 @@ public class EncryptionOptions {
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return this;
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}
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/**
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* If this method is called, subsequent calls to {@link #addRecipient(PGPPublicKeyRing)} will allow encryption
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* for subkeys that do not carry any {@link org.pgpainless.algorithm.KeyFlag} subpacket.
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* This is a workaround for dealing with legacy keys that have no key flags subpacket but rely on the key algorithm
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* type to convey the subkeys use.
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*
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* @return this
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*/
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public EncryptionOptions setAllowEncryptionWithMissingKeyFlags() {
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this.allowEncryptionWithMissingKeyFlags = true;
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return this;
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}
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/**
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* Return <pre>true</pre> iff the user specified at least one encryption method,
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* <pre>false</pre> otherwise.
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@ -60,7 +60,7 @@ public class KeyRingBuilder implements KeyRingBuilderInterface<KeyRingBuilder> {
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private final List<KeySpec> subkeySpecs = new ArrayList<>();
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private final Map<String, SelfSignatureSubpackets.Callback> userIds = new LinkedHashMap<>();
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private Passphrase passphrase = Passphrase.emptyPassphrase();
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private Date expirationDate = new Date(System.currentTimeMillis() + YEAR_IN_SECONDS * 5); // Expiration in 5 yeras
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private Date expirationDate = new Date(System.currentTimeMillis() + YEAR_IN_SECONDS * 5); // Expiration in 5 years
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@Override
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public KeyRingBuilder setPrimaryKey(@Nonnull KeySpec keySpec) {
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@ -0,0 +1,187 @@
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// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
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//
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// SPDX-License-Identifier: Apache-2.0
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package org.pgpainless.encryption_signing;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import static org.junit.jupiter.api.Assertions.assertThrows;
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import static org.junit.jupiter.api.Assertions.assertTrue;
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.nio.charset.StandardCharsets;
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import org.bouncycastle.openpgp.PGPException;
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import org.bouncycastle.openpgp.PGPPublicKeyRing;
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import org.bouncycastle.openpgp.PGPSecretKeyRing;
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import org.bouncycastle.util.io.Streams;
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import org.junit.jupiter.api.Test;
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import org.pgpainless.PGPainless;
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import org.pgpainless.decryption_verification.ConsumerOptions;
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import org.pgpainless.decryption_verification.DecryptionStream;
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import org.pgpainless.decryption_verification.MessageMetadata;
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import org.pgpainless.exception.KeyException;
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public class EncryptionWithMissingKeyFlagsTest {
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private static final String KEY_WITHOUT_KEY_FLAGS = "-----BEGIN PGP PRIVATE KEY BLOCK-----\n" +
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"Version: PGPainless\n" +
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"Comment: A991 A732 9021 7D2D 1250 93C3 2503 6033 1D81 E264\n" +
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"Comment: Test <test@example.org>\n" +
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"\n" +
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||||
"Oqewjlno7hx5hwHwaDvqdxJulFXWV//7O0R0FvGCqHS+TrpRTEyY+r4yYN9fSp/r\n" +
|
||||
"/h5KvL/QspRset6CqQvFlRa5aARYjU0qTb4KwtGHGlaKmDWA9Ipf8U+//dxyDy1+\n" +
|
||||
"pWXL5XH+DyfUzpDH5XgPaa05QwX8Wgfk7uYR3IOtVk4cL4B8+O16kIVfQo7geUpQ\n" +
|
||||
"heetrKk8fTobRwIu+vN4xWEIqrsX65EmvMWV/DGYmFKHskjKmc7+z8o33/spthHY\n" +
|
||||
"lh0k0LBQrX/YNegabaT+3gffzz7/\n" +
|
||||
"=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));
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue