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Code Issues Releases Wiki Activity

Implement exporting secret key

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This commit is contained in:
Paul Schaub 2018-05-23 14:57:37 +02:00
parent 55b9c1ac2a
commit 878ac56ed0
10 changed files with 179 additions and 17 deletions
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4
smack-openpgp-bouncycastle/src/main/java/org/jivesoftware/smackx/ox/bouncycastle/BouncyCastleIdentityStore.java
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@ -27,9 +27,9 @@ import org.jxmpp.jid.BareJid;
public interface BouncyCastleIdentityStore {
void storePubkeyList(BareJid jid, PublicKeysListElement list) throws FileNotFoundException, IOException;
void storeActivePubkeyList(BareJid jid, PublicKeysListElement list) throws FileNotFoundException, IOException;
PublicKeysListElement loadPubkeyList(BareJid jid) throws FileNotFoundException, IOException;
PublicKeysListElement loadActivePubkeyList(BareJid jid) throws FileNotFoundException, IOException;
void storePublicKeys(BareJid jid, PGPPublicKeyRingCollection keys);

53
smack-openpgp-bouncycastle/src/main/java/org/jivesoftware/smackx/ox/bouncycastle/BouncyCastleOpenPgpProvider.java
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@ -28,6 +28,7 @@ import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import org.jivesoftware.smack.SmackException;
import org.jivesoftware.smack.util.stringencoder.Base64;
import org.jivesoftware.smackx.ox.OpenPgpMessage;
import org.jivesoftware.smackx.ox.OpenPgpProvider;
@ -35,22 +36,30 @@ import org.jivesoftware.smackx.ox.element.CryptElement;
import org.jivesoftware.smackx.ox.element.OpenPgpElement;
import org.jivesoftware.smackx.ox.element.PubkeyElement;
import org.jivesoftware.smackx.ox.element.PublicKeysListElement;
import org.jivesoftware.smackx.ox.element.SecretkeyElement;
import org.jivesoftware.smackx.ox.element.SignElement;
import org.jivesoftware.smackx.ox.element.SigncryptElement;
import org.jivesoftware.smackx.ox.exception.CorruptedOpenPgpKeyException;
import name.neuhalfen.projects.crypto.bouncycastle.openpgp.BouncyGPG;
import name.neuhalfen.projects.crypto.bouncycastle.openpgp.algorithms.PGPSymmetricEncryptionAlgorithms;
import name.neuhalfen.projects.crypto.bouncycastle.openpgp.algorithms.PublicKeySize;
import name.neuhalfen.projects.crypto.bouncycastle.openpgp.keys.callbacks.KeyringConfigCallbacks;
import name.neuhalfen.projects.crypto.bouncycastle.openpgp.keys.callbacks.XmppKeySelectionStrategy;
import name.neuhalfen.projects.crypto.bouncycastle.openpgp.keys.keyrings.InMemoryKeyring;
import name.neuhalfen.projects.crypto.bouncycastle.openpgp.keys.keyrings.KeyringConfig;
import name.neuhalfen.projects.crypto.bouncycastle.openpgp.keys.keyrings.KeyringConfigs;
import org.bouncycastle.bcpg.HashAlgorithmTags;
import org.bouncycastle.openpgp.PGPException;
import org.bouncycastle.openpgp.PGPKeyRingGenerator;
import org.bouncycastle.openpgp.PGPPublicKey;
import org.bouncycastle.openpgp.PGPPublicKeyRing;
import org.bouncycastle.openpgp.PGPSecretKey;
import org.bouncycastle.openpgp.PGPSecretKeyRing;
import org.bouncycastle.openpgp.operator.PBESecretKeyEncryptor;
import org.bouncycastle.openpgp.operator.PGPDigestCalculator;
import org.bouncycastle.openpgp.operator.jcajce.JcaPGPDigestCalculatorProviderBuilder;
import org.bouncycastle.openpgp.operator.jcajce.JcePBESecretKeyEncryptorBuilder;
import org.bouncycastle.util.encoders.Hex;
import org.bouncycastle.util.io.Streams;
import org.jxmpp.jid.BareJid;
@ -83,6 +92,38 @@ public class BouncyCastleOpenPgpProvider implements OpenPgpProvider {
}
}
@Override
public SecretkeyElement createSecretkeyElement(String password) throws CorruptedOpenPgpKeyException {
try {
// Our unencrypted secret key
PGPSecretKey secretKey = ourKeys.getSecretKeyRings().getSecretKey(ourKeyId);
PGPDigestCalculator calculator = new JcaPGPDigestCalculatorProviderBuilder()
.setProvider(BouncyGPG.getProvider())
.build()
.get(HashAlgorithmTags.SHA1);
PBESecretKeyEncryptor encryptor = new JcePBESecretKeyEncryptorBuilder(
PGPSymmetricEncryptionAlgorithms.AES_256.getAlgorithmId())
.setProvider(BouncyGPG.getProvider())
.build(password.toCharArray());
PGPSecretKey encrypted = new PGPSecretKey(
secretKey.extractPrivateKey(null),
secretKey.getPublicKey(),
calculator,
true,
encryptor);
byte[] base64 = Base64.encode(encrypted.getEncoded());
return new SecretkeyElement(base64);
} catch (PGPException | IOException e) {
throw new CorruptedOpenPgpKeyException(e);
}
}
@Override
public void processPubkeyElement(PubkeyElement element, BareJid owner) throws CorruptedOpenPgpKeyException {
byte[] decoded = Base64.decode(element.getDataElement().getB64Data());
@ -159,6 +200,9 @@ public class BouncyCastleOpenPgpProvider implements OpenPgpProvider {
@Override
public OpenPgpElement sign(SignElement element) throws Exception {
throw new SmackException.FeatureNotSupportedException("Feature not implemented for now.");
/*
InMemoryKeyring signingConfig = KeyringConfigs.forGpgExportedKeys(KeyringConfigCallbacks.withUnprotectedKeys());
// Add our secret keys to signing config
@ -170,16 +214,19 @@ public class BouncyCastleOpenPgpProvider implements OpenPgpProvider {
// TODO: Implement
return null;
*/
}
@Override
public OpenPgpMessage verify(OpenPgpElement element, BareJid sender) throws Exception {
// TODO: Implement
return null;
throw new SmackException.FeatureNotSupportedException("Feature not implemented for now.");
}
@Override
public OpenPgpMessage decrypt(OpenPgpElement element) throws Exception {
throw new SmackException.FeatureNotSupportedException("Feature not implemented for now.");
/*
InMemoryKeyring decryptionConfig = KeyringConfigs.forGpgExportedKeys(KeyringConfigCallbacks.withUnprotectedKeys());
// Add our secret keys to decryption config
@ -201,10 +248,13 @@ public class BouncyCastleOpenPgpProvider implements OpenPgpProvider {
Streams.pipeAll(decrypted, decryptedOut);
return new OpenPgpMessage(OpenPgpMessage.State.crypt, new String(decryptedOut.toByteArray(), Charset.forName("UTF-8")));
*/
}
@Override
public OpenPgpElement encrypt(CryptElement element, Set<BareJid> recipients) throws Exception {
throw new SmackException.FeatureNotSupportedException("Feature not implemented for now.");
/*
if (recipients.isEmpty()) {
throw new IllegalArgumentException("Set of recipients must not be empty");
}
@ -249,6 +299,7 @@ public class BouncyCastleOpenPgpProvider implements OpenPgpProvider {
String base64 = Base64.encodeToString(encryptedOut.toByteArray());
return new OpenPgpElement(base64);
*/
}
@Override

4
smack-openpgp-bouncycastle/src/main/java/org/jivesoftware/smackx/ox/bouncycastle/FileBasedBouncyCastleIdentityStore.java
View file

@ -54,7 +54,7 @@ public class FileBasedBouncyCastleIdentityStore implements BouncyCastleIdentityS
}
@Override
public void storePubkeyList(BareJid jid, PublicKeysListElement list) throws IOException {
public void storeActivePubkeyList(BareJid jid, PublicKeysListElement list) throws IOException {
File contactsDir = contactsDir(jid);
File destination = new File(contactsDir, "pubkey_list");
DataOutputStream dataOut = new DataOutputStream(new FileOutputStream(destination));
@ -69,7 +69,7 @@ public class FileBasedBouncyCastleIdentityStore implements BouncyCastleIdentityS
}
@Override
public PublicKeysListElement loadPubkeyList(BareJid jid) throws IOException {
public PublicKeysListElement loadActivePubkeyList(BareJid jid) throws IOException {
File contactsDir = contactsDir(jid);
File source = new File(contactsDir, "pubkey_list");
if (!source.exists()) {

6
smack-openpgp-bouncycastle/src/test/java/org/jivesoftware/smackx/ox/bouncycastle/FileBasedBouncyCastleIdentityStoreTest.java
View file

@ -66,11 +66,11 @@ public class FileBasedBouncyCastleIdentityStoreTest extends SmackTestSuite {
FileBasedBouncyCastleIdentityStore store = new FileBasedBouncyCastleIdentityStore(storePath);
PublicKeysListElement shouldBeNull = store.loadPubkeyList(jid);
PublicKeysListElement shouldBeNull = store.loadActivePubkeyList(jid);
assertNull(shouldBeNull);
store.storePubkeyList(jid, list);
store.storeActivePubkeyList(jid, list);
PublicKeysListElement retrieved = store.loadPubkeyList(jid);
PublicKeysListElement retrieved = store.loadActivePubkeyList(jid);
assertEquals(list.getMetadata(), retrieved.getMetadata());
}

54
smack-openpgp/src/main/java/org/jivesoftware/smackx/ox/OpenPgpManager.java
View file

@ -16,6 +16,7 @@
*/
package org.jivesoftware.smackx.ox;
import java.security.SecureRandom;
import java.util.Date;
import java.util.List;
import java.util.Map;
@ -30,8 +31,10 @@ import org.jivesoftware.smack.XMPPException;
import org.jivesoftware.smack.packet.Message;
import org.jivesoftware.smack.util.Async;
import org.jivesoftware.smackx.disco.ServiceDiscoveryManager;
import org.jivesoftware.smackx.ox.callback.DisplayBackupCodeCallback;
import org.jivesoftware.smackx.ox.element.PubkeyElement;
import org.jivesoftware.smackx.ox.element.PublicKeysListElement;
import org.jivesoftware.smackx.ox.element.SecretkeyElement;
import org.jivesoftware.smackx.ox.exception.CorruptedOpenPgpKeyException;
import org.jivesoftware.smackx.pep.PEPListener;
import org.jivesoftware.smackx.pep.PEPManager;
@ -57,6 +60,11 @@ public final class OpenPgpManager extends Manager {
*/
public static final String PEP_NODE_PUBLIC_KEYS = "urn:xmpp:openpgp:0:public-keys";
/**
* Name of the OX secret key node.
*/
public static final String PEP_NODE_SECRET_KEY = "urn:xmpp:openpgp:0:secret-key";
/**
* Feature to be announced using the {@link ServiceDiscoveryManager} to subscribe to the OX metadata node.
*
@ -272,12 +280,20 @@ public final class OpenPgpManager extends Manager {
/**
* TODO: Implement and document.
*/
public void depositSecretKey() {
public void depositSecretKey(DisplayBackupCodeCallback callback)
throws CorruptedOpenPgpKeyException, InterruptedException, PubSubException.NotALeafNodeException,
XMPPException.XMPPErrorException, SmackException.NotConnectedException, SmackException.NoResponseException {
ensureProviderIsSet();
// Create key backup by appending serialized unencrypted secret keys.
// Encrypt the backup using a random generated password
// Publish the backup to the secret key node (whitelist protected)
// Display the backup key to the user
String password = generateBackupPassword();
SecretkeyElement secretKeyElement = provider.createSecretkeyElement(password);
PubSubManager pm = PubSubManager.getInstance(connection());
LeafNode secretKeyNode = pm.getOrCreateLeafNode(PEP_NODE_SECRET_KEY);
PubSubHelper.whitelist(secretKeyNode);
secretKeyNode.publish(new PayloadItem<>(secretKeyElement));
callback.displayBackupCode(password);
}
/**
@ -349,4 +365,32 @@ public final class OpenPgpManager extends Manager {
}
}
};
/**
* Generate a secure backup code.
*
* @see <a href="https://xmpp.org/extensions/xep-0373.html#sect-idm140425111347232">XEP-0373 §5.3</a>
* @return backup code
*/
private String generateBackupPassword() {
final String alphabet = "123456789ABCDEFGHIJKLMNPQRSTUVWXYZ";
SecureRandom random = new SecureRandom();
StringBuilder code = new StringBuilder();
// 6 blocks
for (int i = 0; i < 6; i++) {
// of 4 chars
for (int j = 0; j < 4; j++) {
char c = alphabet.charAt(random.nextInt(alphabet.length()));
code.append(c);
}
// dash after every block except the last one
if (i != 5) {
code.append('-');
}
}
return code.toString();
}
}

3
smack-openpgp/src/main/java/org/jivesoftware/smackx/ox/OpenPgpProvider.java
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@ -22,6 +22,7 @@ import org.jivesoftware.smackx.ox.element.CryptElement;
import org.jivesoftware.smackx.ox.element.OpenPgpElement;
import org.jivesoftware.smackx.ox.element.PubkeyElement;
import org.jivesoftware.smackx.ox.element.PublicKeysListElement;
import org.jivesoftware.smackx.ox.element.SecretkeyElement;
import org.jivesoftware.smackx.ox.element.SignElement;
import org.jivesoftware.smackx.ox.element.SigncryptElement;
import org.jivesoftware.smackx.ox.exception.CorruptedOpenPgpKeyException;
@ -151,4 +152,6 @@ public interface OpenPgpProvider {
* @throws CorruptedOpenPgpKeyException if for some reason the fingerprint cannot be derived from the key pair.
*/
String getFingerprint() throws CorruptedOpenPgpKeyException;
SecretkeyElement createSecretkeyElement(String password) throws CorruptedOpenPgpKeyException;
}

10
smack-openpgp/src/main/java/org/jivesoftware/smackx/ox/PubSubHelper.java
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@ -21,16 +21,18 @@ import org.jivesoftware.smack.XMPPException;
import org.jivesoftware.smackx.pubsub.AccessModel;
import org.jivesoftware.smackx.pubsub.ConfigureForm;
import org.jivesoftware.smackx.pubsub.LeafNode;
import org.jivesoftware.smackx.xdata.packet.DataForm;
public class PubSubHelper {
public static void whitelist(LeafNode node)
throws XMPPException.XMPPErrorException, SmackException.NotConnectedException, InterruptedException,
SmackException.NoResponseException {
ConfigureForm config = node.getNodeConfiguration();
if (config.getAccessModel() != AccessModel.whitelist) {
config.setAccessModel(AccessModel.whitelist);
node.sendConfigurationForm(config);
ConfigureForm old = node.getNodeConfiguration();
if (old.getAccessModel() != AccessModel.whitelist) {
ConfigureForm _new = new ConfigureForm(DataForm.Type.submit);
_new.setAccessModel(AccessModel.whitelist);
node.sendConfigurationForm(_new);
}
}

21
smack-openpgp/src/main/java/org/jivesoftware/smackx/ox/callback/AskForBackupCodeCallback.java Normal file
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@ -0,0 +1,21 @@
/**
*
* Copyright 2018 Paul Schaub.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jivesoftware.smackx.ox.callback;
public interface AskForBackupCodeCallback {
String askForBackupCode();
}

21
smack-openpgp/src/main/java/org/jivesoftware/smackx/ox/callback/DisplayBackupCodeCallback.java Normal file
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@ -0,0 +1,21 @@
/**
*
* Copyright 2018 Paul Schaub.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jivesoftware.smackx.ox.callback;
public interface DisplayBackupCodeCallback {
void displayBackupCode(String backupCode);
}

20
smack-openpgp/src/main/java/org/jivesoftware/smackx/ox/callback/package-info.java Normal file
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@ -0,0 +1,20 @@
/**
*
* Copyright 2017 Florian Schmaus.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Callback classes for XEP-0373: OpenPGP for XMPP.
*/
package org.jivesoftware.smackx.ox.callback;