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Calculate and verify signature and MAC for Introduction ACKs

Browse Source 
Before the introducee sends her ACK,
she derives a master key from the ephemeral shared secret as before.

Two nonces and a MAC key are then derived from the master key.
The local introducee signs one of the nonces and calculates a MAC
over her own identity public key, ephemeral public key,
transport properties and timestamp.
The local introducee includes the signature and MAC in her ACK.

On receiving the remote introducee's ACK,
the local introducee verifies the signature and MAC.
Should the verification fail, an ABORT is sent to the introducer and
the remote introducee that was added as inactive is deleted again.
This commit is contained in:
Torsten Grote
2016-08-26 16:37:02 -03:00
parent 7db0e4472a
commit fc5a7290e3
11 changed files with 394 additions and 212 deletions
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371
briar-android-tests/src/test/java/org/briarproject/IntroductionIntegrationTest.java
View File

@@ -2,10 +2,13 @@ package org.briarproject;
import net.jodah.concurrentunit.Waiter;
import org.briarproject.api.clients.ClientHelper;
import org.briarproject.api.clients.SessionId;
import org.briarproject.api.contact.Contact;
import org.briarproject.api.contact.ContactId;
import org.briarproject.api.contact.ContactManager;
import org.briarproject.api.crypto.CryptoComponent;
import org.briarproject.api.crypto.KeyPair;
import org.briarproject.api.crypto.SecretKey;
import org.briarproject.api.data.BdfDictionary;
import org.briarproject.api.data.BdfEntry;
@@ -23,6 +26,7 @@ import org.briarproject.api.event.MessageStateChangedEvent;
import org.briarproject.api.identity.AuthorFactory;
import org.briarproject.api.identity.IdentityManager;
import org.briarproject.api.identity.LocalAuthor;
import org.briarproject.api.introduction.IntroducerProtocolState;
import org.briarproject.api.introduction.IntroductionManager;
import org.briarproject.api.introduction.IntroductionMessage;
import org.briarproject.api.introduction.IntroductionRequest;
@@ -66,12 +70,23 @@ import javax.inject.Inject;
import static org.briarproject.TestPluginsModule.MAX_LATENCY;
import static org.briarproject.TestPluginsModule.TRANSPORT_ID;
import static org.briarproject.api.identity.AuthorConstants.MAX_PUBLIC_KEY_LENGTH;
import static org.briarproject.api.identity.AuthorConstants.MAX_SIGNATURE_LENGTH;
import static org.briarproject.api.introduction.IntroductionConstants.ACCEPT;
import static org.briarproject.api.introduction.IntroductionConstants.E_PUBLIC_KEY;
import static org.briarproject.api.introduction.IntroductionConstants.GROUP_ID;
import static org.briarproject.api.introduction.IntroductionConstants.MAC;
import static org.briarproject.api.introduction.IntroductionConstants.MAC_LENGTH;
import static org.briarproject.api.introduction.IntroductionConstants.NAME;
import static org.briarproject.api.introduction.IntroductionConstants.PUBLIC_KEY;
import static org.briarproject.api.introduction.IntroductionConstants.SESSION_ID;
import static org.briarproject.api.introduction.IntroductionConstants.SIGNATURE;
import static org.briarproject.api.introduction.IntroductionConstants.STATE;
import static org.briarproject.api.introduction.IntroductionConstants.TIME;
import static org.briarproject.api.introduction.IntroductionConstants.TRANSPORT;
import static org.briarproject.api.introduction.IntroductionConstants.TYPE;
import static org.briarproject.api.introduction.IntroductionConstants.TYPE_ACK;
import static org.briarproject.api.introduction.IntroductionConstants.TYPE_REQUEST;
import static org.briarproject.api.introduction.IntroductionConstants.TYPE_RESPONSE;
import static org.briarproject.api.sync.ValidationManager.State.DELIVERED;
import static org.briarproject.api.sync.ValidationManager.State.INVALID;
import static org.junit.Assert.assertEquals;
@@ -90,6 +105,8 @@ public class IntroductionIntegrationTest extends BriarTestCase {
@Inject
Clock clock;
@Inject
CryptoComponent crypto;
@Inject
AuthorFactory authorFactory;
// objects accessed from background threads need to be volatile
@@ -154,32 +171,13 @@ public class IntroductionIntegrationTest extends BriarTestCase {
public void testIntroductionSession() throws Exception {
startLifecycles();
try {
// Add Identities
// Add Identities And Contacts
addDefaultIdentities();
addDefaultContacts();
// Add Transport Properties
addTransportProperties();
// Add introducees as contacts
contactId1 = contactManager0.addContact(author1,
author0.getId(), master, clock.currentTimeMillis(), true,
true, true
);
contactId2 = contactManager0.addContact(author2,
author0.getId(), master, clock.currentTimeMillis(), true,
true, true
);
// Add introducer back
contactId0 = contactManager1.addContact(author0,
author1.getId(), master, clock.currentTimeMillis(), true,
true, true
);
ContactId contactId02 = contactManager2.addContact(author0,
author2.getId(), master, clock.currentTimeMillis(), true,
true, true
);
assertTrue(contactId0.equals(contactId02));
// listen to events
IntroducerListener listener0 = new IntroducerListener();
t0.getEventBus().addListener(listener0);
@@ -259,29 +257,13 @@ public class IntroductionIntegrationTest extends BriarTestCase {
public void testIntroductionSessionFirstDecline() throws Exception {
startLifecycles();
try {
// Add Identities
// Add Identities And Contacts
addDefaultIdentities();
addDefaultContacts();
// Add Transport Properties
addTransportProperties();
// Add introducees as contacts
contactId1 = contactManager0.addContact(author1, author0.getId(),
master, clock.currentTimeMillis(), true, true, true
);
contactId2 = contactManager0.addContact(author2, author0.getId(),
master, clock.currentTimeMillis(), true, true, true
);
// Add introducer back
contactId0 = contactManager1.addContact(author0, author1.getId(),
master, clock.currentTimeMillis(), true, true, true
);
ContactId contactId02 = contactManager2.addContact(author0,
author2.getId(), master, clock.currentTimeMillis(), true,
true, true
);
assertTrue(contactId0.equals(contactId02));
// listen to events
IntroducerListener listener0 = new IntroducerListener();
t0.getEventBus().addListener(listener0);
@@ -352,29 +334,13 @@ public class IntroductionIntegrationTest extends BriarTestCase {
public void testIntroductionSessionSecondDecline() throws Exception {
startLifecycles();
try {
// Add Identities
// Add Identities And Contacts
addDefaultIdentities();
addDefaultContacts();
// Add Transport Properties
addTransportProperties();
// Add introducees as contacts
contactId1 = contactManager0.addContact(author1, author0.getId(),
master, clock.currentTimeMillis(), true, true, true
);
contactId2 = contactManager0.addContact(author2, author0.getId(),
master, clock.currentTimeMillis(), true, true, true
);
// Add introducer back
contactId0 = contactManager1.addContact(author0, author1.getId(),
master, clock.currentTimeMillis(), false, true, true
);
ContactId contactId02 = contactManager2.addContact(author0,
author2.getId(), master, clock.currentTimeMillis(), false,
true, true
);
assertTrue(contactId0.equals(contactId02));
// listen to events
IntroducerListener listener0 = new IntroducerListener();
t0.getEventBus().addListener(listener0);
@@ -440,29 +406,13 @@ public class IntroductionIntegrationTest extends BriarTestCase {
public void testIntroductionSessionDelayedFirstDecline() throws Exception {
startLifecycles();
try {
// Add Identities
// Add Identities And Contacts
addDefaultIdentities();
addDefaultContacts();
// Add Transport Properties
addTransportProperties();
// Add introducees as contacts
contactId1 = contactManager0.addContact(author1, author0.getId(),
master, clock.currentTimeMillis(), true, true, true
);
contactId2 = contactManager0.addContact(author2, author0.getId(),
master, clock.currentTimeMillis(), true, true, true
);
// Add introducer back
contactId0 = contactManager1.addContact(author0, author1.getId(),
master, clock.currentTimeMillis(), false, true, true
);
ContactId contactId02 = contactManager2.addContact(author0,
author2.getId(), master, clock.currentTimeMillis(), false,
true, true
);
assertTrue(contactId0.equals(contactId02));
// listen to events
IntroducerListener listener0 = new IntroducerListener();
t0.getEventBus().addListener(listener0);
@@ -519,21 +469,13 @@ public class IntroductionIntegrationTest extends BriarTestCase {
public void testIntroductionToSameContact() throws Exception {
startLifecycles();
try {
// Add Identities
// Add Identities And Contacts
addDefaultIdentities();
addDefaultContacts();
// Add Transport Properties
addTransportProperties();
// Add introducee as contact
contactId1 = contactManager0.addContact(author1, author0.getId(),
master, clock.currentTimeMillis(), true, true, true
);
// Add introducer back
contactId0 = contactManager1.addContact(author0, author1.getId(),
master, clock.currentTimeMillis(), true, true, true
);
// listen to events
IntroducerListener listener0 = new IntroducerListener();
t0.getEventBus().addListener(listener0);
@@ -669,32 +611,13 @@ public class IntroductionIntegrationTest extends BriarTestCase {
public void testSessionIdReuse() throws Exception {
startLifecycles();
try {
// Add Identities
// Add Identities And Contacts
addDefaultIdentities();
addDefaultContacts();
// Add Transport Properties
addTransportProperties();
// Add introducees as contacts
contactId1 = contactManager0.addContact(author1,
author0.getId(), master, clock.currentTimeMillis(), true,
true, true
);
contactId2 = contactManager0.addContact(author2,
author0.getId(), master, clock.currentTimeMillis(), true,
true, true
);
// Add introducer back
contactId0 = contactManager1.addContact(author0,
author1.getId(), master, clock.currentTimeMillis(), true,
true, true
);
ContactId contactId02 = contactManager2.addContact(author0,
author2.getId(), master, clock.currentTimeMillis(), true,
true, true
);
assertTrue(contactId0.equals(contactId02));
// listen to events
IntroducerListener listener0 = new IntroducerListener();
t0.getEventBus().addListener(listener0);
@@ -766,32 +689,13 @@ public class IntroductionIntegrationTest extends BriarTestCase {
public void testIntroducerRemovedCleanup() throws Exception {
startLifecycles();
try {
// Add Identities
// Add Identities And Contacts
addDefaultIdentities();
addDefaultContacts();
// Add Transport Properties
addTransportProperties();
// Add introducees as contacts
contactId1 = contactManager0.addContact(author1,
author0.getId(), master, clock.currentTimeMillis(), true,
true, true
);
contactId2 = contactManager0.addContact(author2,
author0.getId(), master, clock.currentTimeMillis(), true,
true, true
);
// Add introducer back
contactId0 = contactManager1.addContact(author0,
author1.getId(), master, clock.currentTimeMillis(), true,
true, true
);
ContactId contactId02 = contactManager2.addContact(author0,
author2.getId(), master, clock.currentTimeMillis(), true,
true, true
);
assertTrue(contactId0.equals(contactId02));
// listen to events
IntroducerListener listener0 = new IntroducerListener();
t0.getEventBus().addListener(listener0);
@@ -852,32 +756,13 @@ public class IntroductionIntegrationTest extends BriarTestCase {
public void testIntroduceesRemovedCleanup() throws Exception {
startLifecycles();
try {
// Add Identities
// Add Identities And Contacts
addDefaultIdentities();
addDefaultContacts();
// Add Transport Properties
addTransportProperties();
// Add introducees as contacts
contactId1 = contactManager0.addContact(author1,
author0.getId(), master, clock.currentTimeMillis(), true,
true, true
);
contactId2 = contactManager0.addContact(author2,
author0.getId(), master, clock.currentTimeMillis(), true,
true, true
);
// Add introducer back
contactId0 = contactManager1.addContact(author0,
author1.getId(), master, clock.currentTimeMillis(), true,
true, true
);
ContactId contactId02 = contactManager2.addContact(author0,
author2.getId(), master, clock.currentTimeMillis(), true,
true, true
);
assertTrue(contactId0.equals(contactId02));
// listen to events
IntroducerListener listener0 = new IntroducerListener();
t0.getEventBus().addListener(listener0);
@@ -948,7 +833,149 @@ public class IntroductionIntegrationTest extends BriarTestCase {
}
}
// TODO add a test for faking responses when #256 is implemented
@Test
public void testFakeResponse() throws Exception {
startLifecycles();
try {
addDefaultIdentities();
addDefaultContacts();
addTransportProperties();
// listen to events
IntroducerListener listener0 = new IntroducerListener();
t0.getEventBus().addListener(listener0);
IntroduceeListener listener1 = new IntroduceeListener(1, true);
t1.getEventBus().addListener(listener1);
IntroduceeListener listener2 = new IntroduceeListener(2, true);
t2.getEventBus().addListener(listener2);
// make introduction
long time = clock.currentTimeMillis();
Contact introducee1 = contactManager0.getContact(contactId1);
Contact introducee2 = contactManager0.getContact(contactId2);
introductionManager0
.makeIntroduction(introducee1, introducee2, "Hi!", time);
// sync first request message
deliverMessage(sync0, contactId0, sync1, contactId1, "0 to 1");
eventWaiter.await(TIMEOUT, 1);
assertTrue(listener1.requestReceived);
// sync first response
deliverMessage(sync1, contactId1, sync0, contactId0, "1 to 0");
eventWaiter.await(TIMEOUT, 1);
assertTrue(listener0.response1Received);
// get SessionId
List<IntroductionMessage> list = new ArrayList<>(
introductionManager1.getIntroductionMessages(contactId0));
assertEquals(2, list.size());
assertTrue(list.get(0) instanceof IntroductionRequest);
IntroductionRequest msg = (IntroductionRequest) list.get(0);
SessionId sessionId = msg.getSessionId();
// get contact group
IntroductionGroupFactory groupFactory =
t0.getIntroductionGroupFactory();
Group group = groupFactory.createIntroductionGroup(introducee1);
// get data for contact2
long timestamp = clock.currentTimeMillis();
KeyPair eKeyPair = crypto.generateAgreementKeyPair();
byte[] ePublicKey = eKeyPair.getPublic().getEncoded();
TransportProperties tp = new TransportProperties(
Collections.singletonMap("key", "value"));
BdfDictionary tpDict = BdfDictionary.of(new BdfEntry("fake", tp));
// create a fake response
BdfDictionary d = BdfDictionary.of(
new BdfEntry(TYPE, TYPE_RESPONSE),
new BdfEntry(SESSION_ID, sessionId),
new BdfEntry(GROUP_ID, group.getId()),
new BdfEntry(ACCEPT, true),
new BdfEntry(TIME, timestamp),
new BdfEntry(E_PUBLIC_KEY, ePublicKey),
new BdfEntry(TRANSPORT, tpDict)
);
// add the message to the queue
DatabaseComponent db0 = t0.getDatabaseComponent();
MessageSender sender0 = t0.getMessageSender();
Transaction txn = db0.startTransaction(false);
try {
sender0.sendMessage(txn, d);
txn.setComplete();
} finally {
db0.endTransaction(txn);
}
// send the fake response
deliverMessage(sync0, contactId0, sync1, contactId1, "0 to 1");
// fake session state for introducer, so she doesn't abort
ClientHelper clientHelper0 = t0.getClientHelper();
BdfDictionary state =
clientHelper0.getMessageMetadataAsDictionary(sessionId);
state.put(STATE, IntroducerProtocolState.AWAIT_ACKS.getValue());
clientHelper0.mergeMessageMetadata(sessionId, state);
// sync back the ACK
deliverMessage(sync1, contactId1, sync0, contactId0, "1 to 0");
// create a fake ACK
// TODO do we need to actually calculate a MAC and signature here?
byte[] mac = TestUtils.getRandomBytes(MAC_LENGTH);
byte[] sig = TestUtils.getRandomBytes(MAX_SIGNATURE_LENGTH);
d = BdfDictionary.of(
new BdfEntry(TYPE, TYPE_ACK),
new BdfEntry(SESSION_ID, sessionId),
new BdfEntry(GROUP_ID, group.getId()),
new BdfEntry(MAC, mac),
new BdfEntry(SIGNATURE, sig)
);
// add the fake ACK to the message queue
txn = db0.startTransaction(false);
try {
sender0.sendMessage(txn, d);
txn.setComplete();
} finally {
db0.endTransaction(txn);
}
// make sure the contact was already added (as inactive)
DatabaseComponent db1 = t1.getDatabaseComponent();
txn = db1.startTransaction(true);
try {
assertEquals(2, db1.getContacts(txn).size());
txn.setComplete();
} finally {
db1.endTransaction(txn);
}
// send the fake ACK
deliverMessage(sync0, contactId0, sync1, contactId1, "0 to 1");
// make sure session was aborted and contact deleted again
txn = db1.startTransaction(true);
try {
assertEquals(1, db1.getContacts(txn).size());
txn.setComplete();
} finally {
db1.endTransaction(txn);
}
// there should now be an abort message to sync back
deliverMessage(sync1, contactId1, sync0, contactId0, "1 to 0");
// ensure introducer got the abort
state = clientHelper0.getMessageMetadataAsDictionary(sessionId);
assertEquals(IntroducerProtocolState.ERROR.getValue(),
state.getLong(STATE).intValue());
} finally {
stopLifecycles();
}
}
@After
public void tearDown() throws InterruptedException {
@@ -991,20 +1018,48 @@ public class IntroductionIntegrationTest extends BriarTestCase {
}
private void addDefaultIdentities() throws DbException {
author0 = authorFactory.createLocalAuthor(INTRODUCER,
TestUtils.getRandomBytes(MAX_PUBLIC_KEY_LENGTH),
TestUtils.getRandomBytes(123));
KeyPair keyPair0 = crypto.generateSignatureKeyPair();
byte[] publicKey0 = keyPair0.getPublic().getEncoded();
byte[] privateKey0 = keyPair0.getPrivate().getEncoded();
author0 = authorFactory
.createLocalAuthor(INTRODUCER, publicKey0, privateKey0);
identityManager0.addLocalAuthor(author0);
author1 = authorFactory.createLocalAuthor(INTRODUCEE1,
TestUtils.getRandomBytes(MAX_PUBLIC_KEY_LENGTH),
TestUtils.getRandomBytes(123));
KeyPair keyPair1 = crypto.generateSignatureKeyPair();
byte[] publicKey1 = keyPair1.getPublic().getEncoded();
byte[] privateKey1 = keyPair1.getPrivate().getEncoded();
author1 = authorFactory
.createLocalAuthor(INTRODUCEE1, publicKey1, privateKey1);
identityManager1.addLocalAuthor(author1);
author2 = authorFactory.createLocalAuthor(INTRODUCEE2,
TestUtils.getRandomBytes(MAX_PUBLIC_KEY_LENGTH),
TestUtils.getRandomBytes(123));
KeyPair keyPair2 = crypto.generateSignatureKeyPair();
byte[] publicKey2 = keyPair2.getPublic().getEncoded();
byte[] privateKey2 = keyPair2.getPrivate().getEncoded();
author2 = authorFactory
.createLocalAuthor(INTRODUCEE2, publicKey2, privateKey2);
identityManager2.addLocalAuthor(author2);
}
private void addDefaultContacts() throws DbException {
// Add introducees as contacts
contactId1 = contactManager0.addContact(author1,
author0.getId(), master, clock.currentTimeMillis(), true,
true, true
);
contactId2 = contactManager0.addContact(author2,
author0.getId(), master, clock.currentTimeMillis(), true,
true, true
);
// Add introducer back
contactId0 = contactManager1.addContact(author0,
author1.getId(), master, clock.currentTimeMillis(), true,
true, true
);
ContactId contactId02 = contactManager2.addContact(author0,
author2.getId(), master, clock.currentTimeMillis(), true,
true, true
);
assertTrue(contactId0.equals(contactId02));
}
private void deliverMessage(SyncSessionFactory fromSync, ContactId fromId,
SyncSessionFactory toSync, ContactId toId)
throws IOException, TimeoutException {

3
briar-android-tests/src/test/java/org/briarproject/IntroductionIntegrationTestComponent.java
View File

@@ -1,5 +1,6 @@
package org.briarproject;
import org.briarproject.api.clients.ClientHelper;
import org.briarproject.api.contact.ContactManager;
import org.briarproject.api.db.DatabaseComponent;
import org.briarproject.api.event.EventBus;
@@ -85,6 +86,8 @@ public interface IntroductionIntegrationTestComponent {
DatabaseComponent getDatabaseComponent();
ClientHelper getClientHelper();
MessageSender getMessageSender();
IntroductionGroupFactory getIntroductionGroupFactory();

6
briar-api/src/org/briarproject/api/contact/ContactManager.java
View File

@@ -41,8 +41,12 @@ public interface ContactManager {
/** Removes a contact and all associated state. */
void removeContact(ContactId c) throws DbException;
/** Removes a contact and all associated state. */
void removeContact(Transaction txn, ContactId c) throws DbException;
/** Marks a contact as active or inactive. */
void setContactActive(ContactId c, boolean active) throws DbException;
void setContactActive(Transaction txn, ContactId c, boolean active)
throws DbException;
/** Return true if a contact with this name and public key already exists */
boolean contactExists(Transaction txn, AuthorId remoteAuthorId,

6
briar-api/src/org/briarproject/api/crypto/CryptoComponent.java
View File

@@ -43,6 +43,12 @@ public interface CryptoComponent {
*/
SecretKey deriveHeaderKey(SecretKey master, boolean alice);
/**
* Derives a message authentication code key from the given master secret.
* @param alice whether the key is for use by Alice or Bob.
*/
SecretKey deriveMacKey(SecretKey master, boolean alice);
/**
* Derives a nonce from the given master secret for one of the parties to
* sign.

8
briar-api/src/org/briarproject/api/introduction/IntroductionConstants.java
View File

@@ -29,6 +29,9 @@ public interface IntroductionConstants {
String MAC = "mac";
String SIGNATURE = "signature";
/* Validation Constants */
int MAC_LENGTH = 32;
/* Introducer Local State Metadata */
String STATE = "state";
String ROLE = "role";
@@ -61,6 +64,11 @@ public interface IntroductionConstants {
String EXISTS = "contactExists";
String REMOTE_AUTHOR_IS_US = "remoteAuthorIsUs";
String ANSWERED = "answered";
String NONCE = "nonce";
String MAC_KEY = "macKey";
String OUR_TRANSPORT = "ourTransport";
String OUR_MAC = "ourMac";
String OUR_SIGNATURE = "ourSignature";
String TASK = "task";
int TASK_ADD_CONTACT = 0;

13
briar-core/src/org/briarproject/contact/ContactManagerImpl.java
View File

@@ -114,15 +114,9 @@ class ContactManagerImpl implements ContactManager, RemoveIdentityHook {
}
@Override
public void setContactActive(ContactId c, boolean active)
public void setContactActive(Transaction txn, ContactId c, boolean active)
throws DbException {
Transaction txn = db.startTransaction(false);
try {
db.setContactActive(txn, c, active);
txn.setComplete();
} finally {
db.endTransaction(txn);
}
db.setContactActive(txn, c, active);
}
@Override
@@ -145,7 +139,8 @@ class ContactManagerImpl implements ContactManager, RemoveIdentityHook {
return exists;
}
private void removeContact(Transaction txn, ContactId c)
@Override
public void removeContact(Transaction txn, ContactId c)
throws DbException {
Contact contact = db.getContact(txn, c);
for (RemoveContactHook hook : removeHooks)

8
briar-core/src/org/briarproject/crypto/CryptoComponentImpl.java
View File

@@ -87,6 +87,9 @@ class CryptoComponentImpl implements CryptoComponent {
// KDF labels for header key derivation
private static final byte[] A_HEADER = ascii("ALICE_HEADER_KEY");
private static final byte[] B_HEADER = ascii("BOB_HEADER_KEY");
// KDF labels for MAC key derivation
private static final byte[] A_MAC = ascii("ALICE_MAC_KEY");
private static final byte[] B_MAC = ascii("BOB_MAC_KEY");
// KDF label for key rotation
private static final byte[] ROTATE = ascii("ROTATE");
@@ -233,6 +236,11 @@ class CryptoComponentImpl implements CryptoComponent {
return new SecretKey(macKdf(master, alice ? A_INVITE : B_INVITE));
}
@Override
public SecretKey deriveMacKey(SecretKey master, boolean alice) {
return new SecretKey(macKdf(master, alice ? A_MAC : B_MAC));
}
@Override
public byte[] deriveSignatureNonce(SecretKey master,
boolean alice) {

14
briar-core/src/org/briarproject/introduction/IntroduceeEngine.java
View File

@@ -46,7 +46,9 @@ import static org.briarproject.api.introduction.IntroductionConstants.MESSAGE_TI
import static org.briarproject.api.introduction.IntroductionConstants.MSG;
import static org.briarproject.api.introduction.IntroductionConstants.NAME;
import static org.briarproject.api.introduction.IntroductionConstants.NOT_OUR_RESPONSE;
import static org.briarproject.api.introduction.IntroductionConstants.OUR_MAC;
import static org.briarproject.api.introduction.IntroductionConstants.OUR_PUBLIC_KEY;
import static org.briarproject.api.introduction.IntroductionConstants.OUR_SIGNATURE;
import static org.briarproject.api.introduction.IntroductionConstants.OUR_TIME;
import static org.briarproject.api.introduction.IntroductionConstants.PUBLIC_KEY;
import static org.briarproject.api.introduction.IntroductionConstants.REMOTE_AUTHOR_ID;
@@ -192,6 +194,7 @@ public class IntroduceeEngine
// we already sent our ACK and now received the other one
else if (currentState == AWAIT_ACK) {
localState.put(TASK, TASK_ACTIVATE_CONTACT);
addAckData(localState, msg);
messages = Collections.emptyList();
events = Collections.emptyList();
}
@@ -241,6 +244,13 @@ public class IntroduceeEngine
}
}
private void addAckData(BdfDictionary localState, BdfDictionary msg)
throws FormatException {
localState.put(MAC, msg.getRaw(MAC));
localState.put(SIGNATURE, msg.getRaw(SIGNATURE));
}
private BdfDictionary getAckMessage(BdfDictionary localState)
throws FormatException {
@@ -248,8 +258,8 @@ public class IntroduceeEngine
m.put(TYPE, TYPE_ACK);
m.put(GROUP_ID, localState.getRaw(GROUP_ID));
m.put(SESSION_ID, localState.getRaw(SESSION_ID));
m.put(MAC, localState.getRaw(MAC));
m.put(SIGNATURE, localState.getRaw(SIGNATURE));
m.put(MAC, localState.getRaw(OUR_MAC));
m.put(SIGNATURE, localState.getRaw(OUR_SIGNATURE));
if (LOG.isLoggable(INFO)) {
LOG.info("Sending ACK " + " to " +

118
briar-core/src/org/briarproject/introduction/IntroduceeManager.java
View File

@@ -13,6 +13,7 @@ import org.briarproject.api.crypto.KeyParser;
import org.briarproject.api.crypto.PrivateKey;
import org.briarproject.api.crypto.PublicKey;
import org.briarproject.api.crypto.SecretKey;
import org.briarproject.api.crypto.Signature;
import org.briarproject.api.data.BdfDictionary;
import org.briarproject.api.data.BdfList;
import org.briarproject.api.db.DatabaseComponent;
@@ -23,6 +24,8 @@ import org.briarproject.api.event.IntroductionSucceededEvent;
import org.briarproject.api.identity.Author;
import org.briarproject.api.identity.AuthorFactory;
import org.briarproject.api.identity.AuthorId;
import org.briarproject.api.identity.IdentityManager;
import org.briarproject.api.identity.LocalAuthor;
import org.briarproject.api.properties.TransportProperties;
import org.briarproject.api.properties.TransportPropertyManager;
import org.briarproject.api.sync.GroupId;
@@ -32,6 +35,7 @@ import org.briarproject.api.system.Clock;
import java.io.IOException;
import java.security.GeneralSecurityException;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import java.util.logging.Logger;
@@ -53,13 +57,18 @@ import static org.briarproject.api.introduction.IntroductionConstants.GROUP_ID;
import static org.briarproject.api.introduction.IntroductionConstants.INTRODUCER;
import static org.briarproject.api.introduction.IntroductionConstants.LOCAL_AUTHOR_ID;
import static org.briarproject.api.introduction.IntroductionConstants.MAC;
import static org.briarproject.api.introduction.IntroductionConstants.MAC_KEY;
import static org.briarproject.api.introduction.IntroductionConstants.MESSAGE_ID;
import static org.briarproject.api.introduction.IntroductionConstants.MESSAGE_TIME;
import static org.briarproject.api.introduction.IntroductionConstants.NAME;
import static org.briarproject.api.introduction.IntroductionConstants.NONCE;
import static org.briarproject.api.introduction.IntroductionConstants.NOT_OUR_RESPONSE;
import static org.briarproject.api.introduction.IntroductionConstants.OUR_MAC;
import static org.briarproject.api.introduction.IntroductionConstants.OUR_PRIVATE_KEY;
import static org.briarproject.api.introduction.IntroductionConstants.OUR_PUBLIC_KEY;
import static org.briarproject.api.introduction.IntroductionConstants.OUR_SIGNATURE;
import static org.briarproject.api.introduction.IntroductionConstants.OUR_TIME;
import static org.briarproject.api.introduction.IntroductionConstants.OUR_TRANSPORT;
import static org.briarproject.api.introduction.IntroductionConstants.PUBLIC_KEY;
import static org.briarproject.api.introduction.IntroductionConstants.REMOTE_AUTHOR_ID;
import static org.briarproject.api.introduction.IntroductionConstants.REMOTE_AUTHOR_IS_US;
@@ -92,6 +101,7 @@ class IntroduceeManager {
private final TransportPropertyManager transportPropertyManager;
private final AuthorFactory authorFactory;
private final ContactManager contactManager;
private final IdentityManager identityManager;
private final IntroductionGroupFactory introductionGroupFactory;
@Inject
@@ -100,6 +110,7 @@ class IntroduceeManager {
CryptoComponent cryptoComponent,
TransportPropertyManager transportPropertyManager,
AuthorFactory authorFactory, ContactManager contactManager,
IdentityManager identityManager,
IntroductionGroupFactory introductionGroupFactory) {
this.messageSender = messageSender;
@@ -110,6 +121,7 @@ class IntroduceeManager {
this.transportPropertyManager = transportPropertyManager;
this.authorFactory = authorFactory;
this.contactManager = contactManager;
this.identityManager = identityManager;
this.introductionGroupFactory = introductionGroupFactory;
}
@@ -189,18 +201,19 @@ class IntroduceeManager {
byte[] privateKey = keyPair.getPrivate().getEncoded();
Map<TransportId, TransportProperties> transportProperties =
transportPropertyManager.getLocalProperties(txn);
BdfDictionary tp = encodeTransportProperties(transportProperties);
// update session state for later
state.put(ACCEPT, true);
state.put(OUR_TIME, now);
state.put(OUR_PUBLIC_KEY, publicKey);
state.put(OUR_PRIVATE_KEY, privateKey);
state.put(OUR_TRANSPORT, tp);
// define action
BdfDictionary localAction = new BdfDictionary();
localAction.put(TYPE, TYPE_RESPONSE);
localAction.put(TRANSPORT,
encodeTransportProperties(transportProperties));
localAction.put(TRANSPORT, tp);
localAction.put(MESSAGE_TIME, timestamp);
// start engine and process its state update
@@ -311,24 +324,59 @@ class IntroduceeManager {
secretKey = cryptoComponent
.deriveMasterSecret(theirEphemeralKey, keyPair, alice);
} catch (GeneralSecurityException e) {
if (LOG.isLoggable(WARNING))
LOG.log(WARNING, e.toString(), e);
// we can not continue without the shared secret
throw new FormatException();
throw new DbException(e);
}
// TODO MAC and signature
localState.put(MAC, new byte[42]);
localState.put(SIGNATURE, new byte[42]);
// Derive two nonces and a MAC key from the secret master key
byte[] ourNonce =
cryptoComponent.deriveSignatureNonce(secretKey, alice);
byte[] theirNonce =
cryptoComponent.deriveSignatureNonce(secretKey, !alice);
SecretKey macKey = cryptoComponent.deriveMacKey(secretKey, alice);
SecretKey theirMacKey =
cryptoComponent.deriveMacKey(secretKey, !alice);
// Save the other nonce and MAC key for the verification
localState.put(NONCE, theirNonce);
localState.put(MAC_KEY, theirMacKey.getBytes());
// Sign our nonce with our long-term identity public key
AuthorId localAuthorId =
new AuthorId(localState.getRaw(LOCAL_AUTHOR_ID));
LocalAuthor author =
identityManager.getLocalAuthor(txn, localAuthorId);
Signature signature = cryptoComponent.getSignature();
KeyParser sigParser = cryptoComponent.getSignatureKeyParser();
try {
PrivateKey privKey =
sigParser.parsePrivateKey(author.getPrivateKey());
signature.initSign(privKey);
} catch (GeneralSecurityException e) {
// we can not continue without the signature
throw new DbException(e);
}
signature.update(ourNonce);
byte[] sig = signature.sign();
// The agreed timestamp is the minimum of the peers' timestamps
long ourTime = localState.getLong(OUR_TIME);
long theirTime = localState.getLong(TIME);
long timestamp = Math.min(ourTime, theirTime);
// Add the contact to the database
AuthorId localAuthorId =
new AuthorId(localState.getRaw(LOCAL_AUTHOR_ID));
// Calculate a MAC over identity public key, ephemeral public key,
// transport properties and timestamp.
BdfDictionary tp = localState.getDictionary(OUR_TRANSPORT);
BdfList toSignList = BdfList.of(author.getPublicKey(),
publicKeyBytes, tp, ourTime);
byte[] toSign = clientHelper.toByteArray(toSignList);
byte[] mac = cryptoComponent.mac(macKey, toSign);
// Add MAC and signature to localState, so it can be included in ACK
localState.put(OUR_MAC, mac);
localState.put(OUR_SIGNATURE, sig);
// Add the contact to the database as inactive
Author remoteAuthor = authorFactory
.createAuthor(localState.getString(NAME),
localState.getRaw(PUBLIC_KEY));
@@ -365,13 +413,57 @@ class IntroduceeManager {
if (!localState.getBoolean(EXISTS) &&
localState.containsKey(ADDED_CONTACT_ID)) {
LOG.info("Verifying Signature...");
byte[] nonce = localState.getRaw(NONCE);
byte[] sig = localState.getRaw(SIGNATURE);
byte[] keyBytes = localState.getRaw(PUBLIC_KEY);
try {
// Parse the public key
KeyParser keyParser = cryptoComponent.getSignatureKeyParser();
PublicKey key = keyParser.parsePublicKey(keyBytes);
// Verify the signature
Signature signature = cryptoComponent.getSignature();
signature.initVerify(key);
signature.update(nonce);
if (!signature.verify(sig)) {
LOG.warning("Invalid nonce signature in ACK");
throw new GeneralSecurityException();
}
} catch (GeneralSecurityException e) {
if (LOG.isLoggable(WARNING))
LOG.log(WARNING, e.toString(), e);
// we can not continue without verifying the signature
throw new DbException(e);
}
LOG.info("Verifying MAC...");
// get MAC and MAC key from session state
byte[] mac = localState.getRaw(MAC);
byte[] macKeyBytes = localState.getRaw(MAC_KEY);
SecretKey macKey = new SecretKey(macKeyBytes);
// get MAC data and calculate a new MAC with stored key
byte[] pubKey = localState.getRaw(PUBLIC_KEY);
byte[] ePubKey = localState.getRaw(E_PUBLIC_KEY);
BdfDictionary tp = localState.getDictionary(TRANSPORT);
long timestamp = localState.getLong(TIME);
BdfList toSignList = BdfList.of(pubKey, ePubKey, tp, timestamp);
byte[] toSign = clientHelper.toByteArray(toSignList);
byte[] calculatedMac = cryptoComponent.mac(macKey, toSign);
if (!Arrays.equals(mac, calculatedMac)) {
LOG.warning("Received ACK with invalid MAC");
throw new DbException();
}
LOG.info("Activating Contact...");
ContactId contactId = new ContactId(
localState.getLong(ADDED_CONTACT_ID).intValue());
// activate and show contact in contact list
db.setContactActive(txn, contactId, true);
contactManager.setContactActive(txn, contactId, true);
// broadcast event informing of successful introduction
Contact contact = db.getContact(txn, contactId);
@@ -389,7 +481,7 @@ class IntroduceeManager {
LOG.info("Deleting added contact due to abort...");
ContactId contactId = new ContactId(
localState.getLong(ADDED_CONTACT_ID).intValue());
contactManager.removeContact(contactId);
contactManager.removeContact(txn, contactId);
}
}

3
briar-core/src/org/briarproject/introduction/IntroductionValidator.java
View File

@@ -20,6 +20,7 @@ import static org.briarproject.api.introduction.IntroductionConstants.ACCEPT;
import static org.briarproject.api.introduction.IntroductionConstants.E_PUBLIC_KEY;
import static org.briarproject.api.introduction.IntroductionConstants.GROUP_ID;
import static org.briarproject.api.introduction.IntroductionConstants.MAC;
import static org.briarproject.api.introduction.IntroductionConstants.MAC_LENGTH;
import static org.briarproject.api.introduction.IntroductionConstants.MESSAGE_ID;
import static org.briarproject.api.introduction.IntroductionConstants.MESSAGE_TIME;
import static org.briarproject.api.introduction.IntroductionConstants.MSG;
@@ -157,7 +158,7 @@ class IntroductionValidator extends BdfMessageValidator {
checkSize(message, 4);
byte[] mac = message.getRaw(2);
// TODO length check?
checkLength(mac, 1, MAC_LENGTH);
byte[] sig = message.getRaw(3);
checkLength(sig, 1, MAX_SIGNATURE_LENGTH);

56
briar-tests/src/org/briarproject/introduction/IntroduceeManagerTest.java
View File

@@ -5,6 +5,7 @@ import org.briarproject.TestUtils;
import org.briarproject.api.Bytes;
import org.briarproject.api.FormatException;
import org.briarproject.api.clients.ClientHelper;
import org.briarproject.api.clients.SessionId;
import org.briarproject.api.contact.Contact;
import org.briarproject.api.contact.ContactId;
import org.briarproject.api.contact.ContactManager;
@@ -18,8 +19,8 @@ import org.briarproject.api.db.Transaction;
import org.briarproject.api.identity.Author;
import org.briarproject.api.identity.AuthorFactory;
import org.briarproject.api.identity.AuthorId;
import org.briarproject.api.identity.IdentityManager;
import org.briarproject.api.introduction.IntroduceeProtocolState;
import org.briarproject.api.clients.SessionId;
import org.briarproject.api.properties.TransportPropertyManager;
import org.briarproject.api.sync.ClientId;
import org.briarproject.api.sync.Group;
@@ -63,34 +64,33 @@ import static org.briarproject.api.introduction.IntroductionConstants.TYPE;
import static org.briarproject.api.introduction.IntroductionConstants.TYPE_REQUEST;
import static org.briarproject.api.introduction.IntroductionConstants.TYPE_RESPONSE;
import static org.briarproject.api.sync.SyncConstants.MESSAGE_HEADER_LENGTH;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
public class IntroduceeManagerTest extends BriarTestCase {
final Mockery context;
final IntroduceeManager introduceeManager;
final DatabaseComponent db;
final CryptoComponent cryptoComponent;
final ClientHelper clientHelper;
final IntroductionGroupFactory introductionGroupFactory;
final MessageSender messageSender;
final TransportPropertyManager transportPropertyManager;
final AuthorFactory authorFactory;
final ContactManager contactManager;
final Clock clock;
final Contact introducer;
final Contact introducee1;
final Contact introducee2;
final Group localGroup1;
final Group introductionGroup1;
final Group introductionGroup2;
final Transaction txn;
final long time = 42L;
final Message localStateMessage;
final ClientId clientId;
final SessionId sessionId;
final Message message1;
private final Mockery context;
private final IntroduceeManager introduceeManager;
private final DatabaseComponent db;
private final CryptoComponent cryptoComponent;
private final ClientHelper clientHelper;
private final IntroductionGroupFactory introductionGroupFactory;
private final MessageSender messageSender;
private final TransportPropertyManager transportPropertyManager;
private final AuthorFactory authorFactory;
private final ContactManager contactManager;
private final IdentityManager identityManager;
private final Clock clock;
private final Contact introducer;
private final Contact introducee1;
private final Contact introducee2;
private final Group localGroup1;
private final Group introductionGroup1;
private final Transaction txn;
private final long time = 42L;
private final Message localStateMessage;
private final ClientId clientId;
private final SessionId sessionId;
private final Message message1;
public IntroduceeManagerTest() {
context = new Mockery();
@@ -105,10 +105,12 @@ public class IntroduceeManagerTest extends BriarTestCase {
transportPropertyManager = context.mock(TransportPropertyManager.class);
authorFactory = context.mock(AuthorFactory.class);
contactManager = context.mock(ContactManager.class);
identityManager = context.mock(IdentityManager.class);
introduceeManager = new IntroduceeManager(messageSender, db,
clientHelper, clock, cryptoComponent, transportPropertyManager,
authorFactory, contactManager, introductionGroupFactory);
authorFactory, contactManager, identityManager,
introductionGroupFactory);
AuthorId authorId0 = new AuthorId(TestUtils.getRandomId());
Author author0 = new Author(authorId0, "Introducer",
@@ -138,8 +140,6 @@ public class IntroduceeManagerTest extends BriarTestCase {
clientId, new byte[0]);
introductionGroup1 = new Group(new GroupId(TestUtils.getRandomId()),
clientId, new byte[0]);
introductionGroup2 = new Group(new GroupId(TestUtils.getRandomId()),
clientId, new byte[0]);
sessionId = new SessionId(TestUtils.getRandomId());
localStateMessage = new Message(