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Code Issues Releases Wiki Activity

Add method to decrypt OmemoElements from a MamQueryResult

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This commit is contained in:
Paul Schaub 2018-01-11 13:21:11 +01:00
parent 2b71b20a3e
commit ba0b81f750
2 changed files with 115 additions and 7 deletions
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40
smack-omemo/src/main/java/org/jivesoftware/smackx/omemo/OmemoManager.java
View file

@ -25,6 +25,7 @@ import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Random;
import java.util.SortedSet;
import java.util.TreeMap;
@ -49,7 +50,9 @@ import org.jivesoftware.smackx.carbons.CarbonManager;
import org.jivesoftware.smackx.carbons.packet.CarbonExtension;
import org.jivesoftware.smackx.disco.ServiceDiscoveryManager;
import org.jivesoftware.smackx.eme.element.ExplicitMessageEncryptionElement;
import org.jivesoftware.smackx.forward.packet.Forwarded;
import org.jivesoftware.smackx.hints.element.StoreHint;
import org.jivesoftware.smackx.mam.MamManager;
import org.jivesoftware.smackx.muc.MultiUserChat;
import org.jivesoftware.smackx.muc.MultiUserChatManager;
import org.jivesoftware.smackx.muc.RoomInfo;
@ -396,11 +399,39 @@ public final class OmemoManager extends Manager {
return getOmemoService().decryptMessage(managerGuard, sender, omemoElement);
}
/**
* Decrypt OmemoMessages of a {@link org.jivesoftware.smackx.mam.MamManager.MamQueryResult}.
* Return a map of Stanzas and their decrypted counterparts.
*
* Note: This method does not repair broken sessions.
*
* @param result MamQueryResult
* @return map of encrypted stanzas and decrypted messages.
*
* @throws SmackException.NotLoggedInException if the OmemoManager is not authenticated
*/
public Map<Stanza, OmemoMessage.Received> decryptMAMQueryResult(MamManager.MamQueryResult result)
throws SmackException.NotLoggedInException
{
LoggedInOmemoManager managerGuard = new LoggedInOmemoManager(this);
HashMap<Stanza, OmemoMessage.Received> decryptedMessages = new HashMap<>();
for (Forwarded forwarded : result.forwardedMessages) {
Stanza stanza = forwarded.getForwardedStanza();
OmemoMessage.Received decrypted = getOmemoService().decryptStanza(stanza, managerGuard);
if (decrypted != null) {
decryptedMessages.put(stanza, decrypted);
}
}
return decryptedMessages;
}
/**
* Trust that a fingerprint belongs to an OmemoDevice.
* The fingerprint must be the lowercase, hexadecimal fingerprint of the identityKey of the device and must
* be of length 64.
*
*
* @param device device
* @param fingerprint fingerprint
*/
@ -489,11 +520,8 @@ public final class OmemoManager extends Manager {
// Set MAM Storage hint
StoreHint.set(message);
if (OmemoConfiguration.getAddEmeEncryptionHint()) {
message.addExtension(new ExplicitMessageEncryptionElement(
ExplicitMessageEncryptionElement.ExplicitMessageEncryptionProtocol.omemoVAxolotl));
}
message.addExtension(new ExplicitMessageEncryptionElement(
ExplicitMessageEncryptionElement.ExplicitMessageEncryptionProtocol.omemoVAxolotl));
connection().sendStanza(message);
}
}

82
smack-omemo/src/main/java/org/jivesoftware/smackx/omemo/OmemoService.java
View file

@ -1079,7 +1079,7 @@ public abstract class OmemoService<T_IdKeyPair, T_IdKey, T_PreKey, T_SigPreKey,
OmemoManager.LoggedInOmemoManager managerGuard) {
OmemoManager manager = managerGuard.get();
// Avoid the ratchet being manipulated and the bundle being published multiple times simultaneously
synchronized (manager) {
synchronized (manager.LOCK) {
OmemoDevice userDevice = manager.getOwnDevice();
OmemoElement element = carbonCopy.getExtension(OmemoElement.NAME_ENCRYPTED, OmemoElement_VAxolotl.NAMESPACE);
if (element == null) {
@ -1207,6 +1207,86 @@ public abstract class OmemoService<T_IdKeyPair, T_IdKey, T_PreKey, T_SigPreKey,
}
}
/**
* Decrypt the OmemoElement inside the given Stanza and return it.
* Return null if something goes wrong.
*
* @param stanza stanza
* @param managerGuard authenticated OmemoManager
* @return decrypted OmemoMessage or null
*/
OmemoMessage.Received decryptStanza(Stanza stanza, OmemoManager.LoggedInOmemoManager managerGuard) {
OmemoManager manager = managerGuard.get();
// Avoid the ratchet being manipulated and the bundle being published multiple times simultaneously
synchronized (manager.LOCK) {
OmemoDevice userDevice = manager.getOwnDevice();
OmemoElement element = stanza.getExtension(OmemoElement.NAME_ENCRYPTED, OmemoElement_VAxolotl.NAMESPACE);
if (element == null) {
return null;
}
OmemoMessage.Received decrypted = null;
BareJid sender;
try {
MultiUserChat muc = getMuc(manager.getConnection(), stanza.getFrom());
if (muc != null) {
Occupant occupant = muc.getOccupant(stanza.getFrom().asEntityFullJidIfPossible());
Jid occupantJid = occupant.getJid();
if (occupantJid == null) {
LOGGER.log(Level.WARNING, "MUC message received, but there is no way to retrieve the senders Jid. " +
stanza.getFrom());
return null;
}
sender = occupantJid.asBareJid();
// try is for this
decrypted = decryptMessage(managerGuard, sender, element);
} else {
sender = stanza.getFrom().asBareJid();
// and this
decrypted = decryptMessage(managerGuard, sender, element);
}
if (decrypted.isPreKeyMessage() && OmemoConfiguration.getCompleteSessionWithEmptyMessage()) {
LOGGER.log(Level.FINE, "Received a preKeyMessage from " + decrypted.getSenderDevice() + ".\n" +
"Complete the session by sending an empty response message.");
try {
sendRatchetUpdate(managerGuard, decrypted.getSenderDevice());
} catch (CannotEstablishOmemoSessionException e) {
throw new AssertionError("Since we successfully received a message, we MUST be able to " +
"establish a session. " + e);
} catch (NoSuchAlgorithmException | InterruptedException | SmackException.NotConnectedException | SmackException.NoResponseException e) {
LOGGER.log(Level.WARNING, "Cannot send a ratchet update message.", e);
}
}
} catch (NoRawSessionException e) {
OmemoDevice device = e.getDeviceWithoutSession();
LOGGER.log(Level.WARNING, "No raw session found for contact " + device + ". ", e);
} catch (CorruptedOmemoKeyException | CryptoFailedException e) {
LOGGER.log(Level.WARNING, "Could not decrypt incoming message: ", e);
}
// Upload fresh bundle.
if (getOmemoStoreBackend().loadOmemoPreKeys(userDevice).size() < OmemoConstants.PRE_KEY_COUNT_PER_BUNDLE) {
LOGGER.log(Level.FINE, "We used up a preKey. Upload a fresh bundle.");
try {
getOmemoStoreBackend().replenishKeys(userDevice);
OmemoBundleElement bundleElement = getOmemoStoreBackend().packOmemoBundle(userDevice);
publishBundle(manager.getConnection(), userDevice, bundleElement);
} catch (CorruptedOmemoKeyException | InterruptedException | SmackException.NoResponseException | SmackException.NotConnectedException | XMPPException.XMPPErrorException e) {
LOGGER.log(Level.WARNING, "Could not republish replenished bundle.", e);
}
}
return decrypted;
}
}
/**
* Fetch and process a fresh bundle and send an empty preKeyMessage in order to establish a fresh session.
*