441 lines
17 KiB
Java
441 lines
17 KiB
Java
package eu.siacs.conversations.crypto.axolotl;
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import android.util.Log;
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import org.whispersystems.libaxolotl.AxolotlAddress;
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import org.whispersystems.libaxolotl.IdentityKey;
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import org.whispersystems.libaxolotl.IdentityKeyPair;
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import org.whispersystems.libaxolotl.InvalidKeyException;
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import org.whispersystems.libaxolotl.InvalidKeyIdException;
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import org.whispersystems.libaxolotl.ecc.Curve;
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import org.whispersystems.libaxolotl.ecc.ECKeyPair;
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import org.whispersystems.libaxolotl.state.AxolotlStore;
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import org.whispersystems.libaxolotl.state.PreKeyRecord;
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import org.whispersystems.libaxolotl.state.SessionRecord;
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import org.whispersystems.libaxolotl.state.SignedPreKeyRecord;
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import org.whispersystems.libaxolotl.util.KeyHelper;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import eu.siacs.conversations.Config;
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import eu.siacs.conversations.entities.Account;
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import eu.siacs.conversations.entities.Conversation;
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import eu.siacs.conversations.entities.Message;
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import eu.siacs.conversations.services.XmppConnectionService;
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import eu.siacs.conversations.xmpp.jid.InvalidJidException;
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import eu.siacs.conversations.xmpp.jid.Jid;
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public class AxolotlService {
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private Account account;
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private XmppConnectionService mXmppConnectionService;
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private SQLiteAxolotlStore axolotlStore;
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private Map<Jid,XmppAxolotlSession> sessions;
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public static class SQLiteAxolotlStore implements AxolotlStore {
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public static final String PREKEY_TABLENAME = "prekeys";
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public static final String SIGNED_PREKEY_TABLENAME = "signed_prekeys";
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public static final String SESSION_TABLENAME = "signed_prekeys";
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public static final String NAME = "name";
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public static final String DEVICE_ID = "device_id";
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public static final String ID = "id";
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public static final String KEY = "key";
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public static final String ACCOUNT = "account";
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public static final String JSONKEY_IDENTITY_KEY_PAIR = "axolotl_key";
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public static final String JSONKEY_REGISTRATION_ID = "axolotl_reg_id";
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private final Account account;
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private final XmppConnectionService mXmppConnectionService;
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private final IdentityKeyPair identityKeyPair;
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private final int localRegistrationId;
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private static IdentityKeyPair generateIdentityKeyPair() {
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Log.d(Config.LOGTAG, "Generating axolotl IdentityKeyPair...");
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ECKeyPair identityKeyPairKeys = Curve.generateKeyPair();
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IdentityKeyPair ownKey = new IdentityKeyPair(new IdentityKey(identityKeyPairKeys.getPublicKey()),
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identityKeyPairKeys.getPrivateKey());
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return ownKey;
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}
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private static int generateRegistrationId() {
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Log.d(Config.LOGTAG, "Generating axolotl registration ID...");
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int reg_id = KeyHelper.generateRegistrationId(false);
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return reg_id;
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}
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public SQLiteAxolotlStore(Account account, XmppConnectionService service) {
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this.account = account;
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this.mXmppConnectionService = service;
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this.identityKeyPair = loadIdentityKeyPair();
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this.localRegistrationId = loadRegistrationId();
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}
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// --------------------------------------
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// IdentityKeyStore
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// --------------------------------------
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private IdentityKeyPair loadIdentityKeyPair() {
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String serializedKey = this.account.getKey(JSONKEY_IDENTITY_KEY_PAIR);
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IdentityKeyPair ownKey;
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if( serializedKey != null ) {
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try {
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ownKey = new IdentityKeyPair(serializedKey.getBytes());
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} catch (InvalidKeyException e) {
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Log.d(Config.LOGTAG, "Invalid key stored for account " + account.getJid() + ": " + e.getMessage());
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return null;
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}
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} else {
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Log.d(Config.LOGTAG, "Could not retrieve axolotl key for account " + account.getJid());
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ownKey = generateIdentityKeyPair();
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boolean success = this.account.setKey(JSONKEY_IDENTITY_KEY_PAIR, new String(ownKey.serialize()));
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if(success) {
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mXmppConnectionService.databaseBackend.updateAccount(account);
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} else {
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Log.e(Config.LOGTAG, "Failed to write new key to the database!");
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}
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}
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return ownKey;
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}
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private int loadRegistrationId() {
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String regIdString = this.account.getKey(JSONKEY_REGISTRATION_ID);
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int reg_id;
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if (regIdString != null) {
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reg_id = Integer.valueOf(regIdString);
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} else {
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Log.d(Config.LOGTAG, "Could not retrieve axolotl registration id for account " + account.getJid());
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reg_id = generateRegistrationId();
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boolean success = this.account.setKey(JSONKEY_REGISTRATION_ID,""+reg_id);
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if(success) {
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mXmppConnectionService.databaseBackend.updateAccount(account);
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} else {
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Log.e(Config.LOGTAG, "Failed to write new key to the database!");
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}
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}
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return reg_id;
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}
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/**
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* Get the local client's identity key pair.
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*
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* @return The local client's persistent identity key pair.
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*/
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@Override
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public IdentityKeyPair getIdentityKeyPair() {
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return identityKeyPair;
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}
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/**
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* Return the local client's registration ID.
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* <p/>
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* Clients should maintain a registration ID, a random number
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* between 1 and 16380 that's generated once at install time.
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*
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* @return the local client's registration ID.
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*/
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@Override
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public int getLocalRegistrationId() {
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return localRegistrationId;
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}
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/**
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* Save a remote client's identity key
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* <p/>
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* Store a remote client's identity key as trusted.
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*
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* @param name The name of the remote client.
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* @param identityKey The remote client's identity key.
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*/
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@Override
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public void saveIdentity(String name, IdentityKey identityKey) {
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try {
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Jid contactJid = Jid.fromString(name);
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Conversation conversation = this.mXmppConnectionService.find(this.account, contactJid);
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if (conversation != null) {
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conversation.getContact().addAxolotlIdentityKey(identityKey, false);
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mXmppConnectionService.updateConversationUi();
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mXmppConnectionService.syncRosterToDisk(conversation.getAccount());
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}
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} catch (final InvalidJidException e) {
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Log.e(Config.LOGTAG, "Failed to save identityKey for contact name " + name + ": " + e.toString());
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}
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}
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/**
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* Verify a remote client's identity key.
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* <p/>
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* Determine whether a remote client's identity is trusted. Convention is
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* that the TextSecure protocol is 'trust on first use.' This means that
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* an identity key is considered 'trusted' if there is no entry for the recipient
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* in the local store, or if it matches the saved key for a recipient in the local
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* store. Only if it mismatches an entry in the local store is it considered
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* 'untrusted.'
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*
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* @param name The name of the remote client.
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* @param identityKey The identity key to verify.
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* @return true if trusted, false if untrusted.
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*/
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@Override
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public boolean isTrustedIdentity(String name, IdentityKey identityKey) {
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try {
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Jid contactJid = Jid.fromString(name);
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Conversation conversation = this.mXmppConnectionService.find(this.account, contactJid);
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if (conversation != null) {
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List<IdentityKey> trustedKeys = conversation.getContact().getTrustedAxolotlIdentityKeys();
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return trustedKeys.contains(identityKey);
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} else {
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return false;
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}
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} catch (final InvalidJidException e) {
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Log.e(Config.LOGTAG, "Failed to save identityKey for contact name" + name + ": " + e.toString());
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return false;
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}
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}
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// --------------------------------------
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// SessionStore
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// --------------------------------------
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/**
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* Returns a copy of the {@link SessionRecord} corresponding to the recipientId + deviceId tuple,
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* or a new SessionRecord if one does not currently exist.
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* <p/>
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* It is important that implementations return a copy of the current durable information. The
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* returned SessionRecord may be modified, but those changes should not have an effect on the
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* durable session state (what is returned by subsequent calls to this method) without the
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* store method being called here first.
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*
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* @param address The name and device ID of the remote client.
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* @return a copy of the SessionRecord corresponding to the recipientId + deviceId tuple, or
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* a new SessionRecord if one does not currently exist.
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*/
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@Override
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public SessionRecord loadSession(AxolotlAddress address) {
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SessionRecord session = mXmppConnectionService.databaseBackend.loadSession(this.account, address);
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return (session!=null)?session:new SessionRecord();
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}
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/**
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* Returns all known devices with active sessions for a recipient
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*
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* @param name the name of the client.
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* @return all known sub-devices with active sessions.
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*/
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@Override
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public List<Integer> getSubDeviceSessions(String name) {
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return mXmppConnectionService.databaseBackend.getSubDeviceSessions(account,
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new AxolotlAddress(name,0));
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}
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/**
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* Commit to storage the {@link SessionRecord} for a given recipientId + deviceId tuple.
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*
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* @param address the address of the remote client.
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* @param record the current SessionRecord for the remote client.
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*/
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@Override
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public void storeSession(AxolotlAddress address, SessionRecord record) {
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mXmppConnectionService.databaseBackend.storeSession(account, address, record);
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}
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/**
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* Determine whether there is a committed {@link SessionRecord} for a recipientId + deviceId tuple.
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*
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* @param address the address of the remote client.
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* @return true if a {@link SessionRecord} exists, false otherwise.
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*/
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@Override
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public boolean containsSession(AxolotlAddress address) {
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return mXmppConnectionService.databaseBackend.containsSession(account, address);
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}
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/**
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* Remove a {@link SessionRecord} for a recipientId + deviceId tuple.
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*
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* @param address the address of the remote client.
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*/
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@Override
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public void deleteSession(AxolotlAddress address) {
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mXmppConnectionService.databaseBackend.deleteSession(account, address);
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}
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/**
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* Remove the {@link SessionRecord}s corresponding to all devices of a recipientId.
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*
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* @param name the name of the remote client.
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*/
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@Override
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public void deleteAllSessions(String name) {
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mXmppConnectionService.databaseBackend.deleteAllSessions(account,
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new AxolotlAddress(name,0));
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}
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// --------------------------------------
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// PreKeyStore
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// --------------------------------------
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/**
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* Load a local PreKeyRecord.
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*
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* @param preKeyId the ID of the local PreKeyRecord.
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* @return the corresponding PreKeyRecord.
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* @throws InvalidKeyIdException when there is no corresponding PreKeyRecord.
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*/
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@Override
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public PreKeyRecord loadPreKey(int preKeyId) throws InvalidKeyIdException {
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PreKeyRecord record = mXmppConnectionService.databaseBackend.loadPreKey(account, preKeyId);
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if(record == null) {
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throw new InvalidKeyIdException("No such PreKeyRecord!");
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}
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return record;
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}
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/**
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* Store a local PreKeyRecord.
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*
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* @param preKeyId the ID of the PreKeyRecord to store.
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* @param record the PreKeyRecord.
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*/
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@Override
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public void storePreKey(int preKeyId, PreKeyRecord record) {
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mXmppConnectionService.databaseBackend.storePreKey(account, record);
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}
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/**
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* @param preKeyId A PreKeyRecord ID.
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* @return true if the store has a record for the preKeyId, otherwise false.
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*/
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@Override
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public boolean containsPreKey(int preKeyId) {
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return mXmppConnectionService.databaseBackend.containsPreKey(account, preKeyId);
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}
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/**
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* Delete a PreKeyRecord from local storage.
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*
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* @param preKeyId The ID of the PreKeyRecord to remove.
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*/
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@Override
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public void removePreKey(int preKeyId) {
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mXmppConnectionService.databaseBackend.deletePreKey(account, preKeyId);
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}
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// --------------------------------------
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// SignedPreKeyStore
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// --------------------------------------
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/**
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* Load a local SignedPreKeyRecord.
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*
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* @param signedPreKeyId the ID of the local SignedPreKeyRecord.
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* @return the corresponding SignedPreKeyRecord.
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* @throws InvalidKeyIdException when there is no corresponding SignedPreKeyRecord.
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*/
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@Override
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public SignedPreKeyRecord loadSignedPreKey(int signedPreKeyId) throws InvalidKeyIdException {
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SignedPreKeyRecord record = mXmppConnectionService.databaseBackend.loadSignedPreKey(account, signedPreKeyId);
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if(record == null) {
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throw new InvalidKeyIdException("No such PreKeyRecord!");
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}
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return record;
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}
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/**
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* Load all local SignedPreKeyRecords.
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*
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* @return All stored SignedPreKeyRecords.
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*/
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@Override
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public List<SignedPreKeyRecord> loadSignedPreKeys() {
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return mXmppConnectionService.databaseBackend.loadSignedPreKeys(account);
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}
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/**
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* Store a local SignedPreKeyRecord.
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*
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* @param signedPreKeyId the ID of the SignedPreKeyRecord to store.
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* @param record the SignedPreKeyRecord.
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*/
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@Override
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public void storeSignedPreKey(int signedPreKeyId, SignedPreKeyRecord record) {
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mXmppConnectionService.databaseBackend.storeSignedPreKey(account, record);
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}
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/**
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* @param signedPreKeyId A SignedPreKeyRecord ID.
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* @return true if the store has a record for the signedPreKeyId, otherwise false.
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*/
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@Override
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public boolean containsSignedPreKey(int signedPreKeyId) {
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return mXmppConnectionService.databaseBackend.containsSignedPreKey(account, signedPreKeyId);
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}
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/**
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* Delete a SignedPreKeyRecord from local storage.
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*
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* @param signedPreKeyId The ID of the SignedPreKeyRecord to remove.
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*/
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@Override
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public void removeSignedPreKey(int signedPreKeyId) {
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mXmppConnectionService.databaseBackend.deleteSignedPreKey(account, signedPreKeyId);
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}
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}
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private static class XmppAxolotlSession {
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private List<Message> untrustedMessages;
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private AxolotlStore axolotlStore;
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public XmppAxolotlSession(SQLiteAxolotlStore axolotlStore) {
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this.untrustedMessages = new ArrayList<>();
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this.axolotlStore = axolotlStore;
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}
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public void trust() {
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for (Message message : this.untrustedMessages) {
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message.trust();
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}
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this.untrustedMessages = null;
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}
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public boolean isTrusted() {
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return (this.untrustedMessages == null);
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}
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public String processReceiving(XmppAxolotlMessage incomingMessage) {
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return null;
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}
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public XmppAxolotlMessage processSending(String outgoingMessage) {
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return null;
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}
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}
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public AxolotlService(Account account, XmppConnectionService connectionService) {
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this.mXmppConnectionService = connectionService;
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this.account = account;
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this.axolotlStore = new SQLiteAxolotlStore(this.account, this.mXmppConnectionService);
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this.sessions = new HashMap<>();
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}
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public void trustSession(Jid counterpart) {
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XmppAxolotlSession session = sessions.get(counterpart);
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if(session != null) {
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session.trust();
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}
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}
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public boolean isTrustedSession(Jid counterpart) {
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XmppAxolotlSession session = sessions.get(counterpart);
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return session != null && session.isTrusted();
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}
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}
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