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Do not allow session ID reuse and clean up sessions for introducee

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It was possible that a malicious introducer sends new request with the
same session ID that was used previously and thus causing introducees to
have multiple states for the same session ID.
This commits prevents that from happening and adds an integration test
for that scenario.

Also if an introducee removes an introducer, all past session states
will be deleted from the database. For this, a test was added as well.

Closes #371
Closes #372
This commit is contained in:
Torsten Grote
2016-05-04 20:39:22 -03:00
parent 5a84e0fe5c
commit 685e1422a5
6 changed files with 241 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
briar-core/src/org/briarproject/introduction/IntroductionGroupFactory.java
View File

@@ -6,7 +6,7 @@ import org.briarproject.api.sync.Group;
import javax.inject.Inject;
class IntroductionGroupFactory {
public class IntroductionGroupFactory {
final private PrivateGroupFactory privateGroupFactory;
final private Group localGroup;

28
briar-core/src/org/briarproject/introduction/IntroductionManagerImpl.java
View File

@@ -147,8 +147,13 @@ class IntroductionManagerImpl extends BdfIncomingMessageHook
for (Map.Entry<MessageId, BdfDictionary> entry : map.entrySet()) {
BdfDictionary d = entry.getValue();
long role = d.getLong(ROLE, -1L);
if (role != ROLE_INTRODUCER) continue;
if (d.getLong(CONTACT_ID_1).equals(id) ||
if (role != ROLE_INTRODUCER) {
if (d.getLong(CONTACT_ID_1).equals(id)) {
// delete states if introducee removes introducer
deleteMessage(txn, entry.getKey());
}
}
else if (d.getLong(CONTACT_ID_1).equals(id) ||
d.getLong(CONTACT_ID_2).equals(id)) {
IntroducerProtocolState state = IntroducerProtocolState
@@ -178,13 +183,19 @@ class IntroductionManagerImpl extends BdfIncomingMessageHook
// Get message data and type
GroupId groupId = m.getGroupId();
message.put(GROUP_ID, groupId);
long type = message.getLong(TYPE, -1L);
// we are an introducee, need to initialize new state
if (type == TYPE_REQUEST) {
boolean stateExists = true;
try {
getSessionState(txn, groupId, message.getRaw(SESSION_ID), false);
} catch (FormatException e) {
stateExists = false;
}
BdfDictionary state;
try {
if (stateExists) throw new FormatException();
state = introduceeManager.initialize(txn, groupId, message);
} catch (FormatException e) {
if (LOG.isLoggable(WARNING)) {
@@ -450,7 +461,8 @@ class IntroductionManagerImpl extends BdfIncomingMessageHook
}
private BdfDictionary getSessionState(Transaction txn, GroupId groupId,
byte[] sessionId) throws DbException, FormatException {
byte[] sessionId, boolean warn)
throws DbException, FormatException {
try {
// See if we can find the state directly for the introducer
@@ -476,7 +488,7 @@ class IntroductionManagerImpl extends BdfIncomingMessageHook
if (g.equals(groupId)) return state;
}
}
if (LOG.isLoggable(WARNING)) {
if (warn && LOG.isLoggable(WARNING)) {
LOG.warning(
"No session state found for message with session ID " +
Arrays.hashCode(sessionId));
@@ -485,6 +497,12 @@ class IntroductionManagerImpl extends BdfIncomingMessageHook
}
}
private BdfDictionary getSessionState(Transaction txn, GroupId groupId,
byte[] sessionId) throws DbException, FormatException {
return getSessionState(txn, groupId, sessionId, true);
}
private void deleteMessage(Transaction txn, MessageId messageId)
throws DbException {

2
briar-core/src/org/briarproject/introduction/IntroductionValidator.java
View File

@@ -16,6 +16,7 @@ import static org.briarproject.api.identity.AuthorConstants.MAX_AUTHOR_NAME_LENG
import static org.briarproject.api.identity.AuthorConstants.MAX_PUBLIC_KEY_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.MESSAGE_ID;
import static org.briarproject.api.introduction.IntroductionConstants.MESSAGE_TIME;
import static org.briarproject.api.introduction.IntroductionConstants.MSG;
@@ -63,6 +64,7 @@ class IntroductionValidator extends BdfMessageValidator {
d.put(TYPE, type);
d.put(SESSION_ID, id);
d.put(GROUP_ID, m.getGroupId());
d.put(MESSAGE_ID, m.getId());
d.put(MESSAGE_TIME, m.getTimestamp());
return d;

2
briar-core/src/org/briarproject/introduction/MessageSender.java
View File

@@ -32,7 +32,7 @@ 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;
class MessageSender {
public class MessageSender {
final private DatabaseComponent db;
final private ClientHelper clientHelper;