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/*
* Copyright (C) 2015 Dominik Schürmann <dominik@dominikschuermann.de>
* Copyright (C) 2015 Vincent Breitmoser <v.breitmoser@mugenguild.com>
* Copyright (C) 2015 Adithya Abraham Philip <adithyaphilip@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.sufficientlysecure.keychain.operations;
import android.content.Context;
import android.support.annotation.NonNull;
import com.textuality.keybase.lib.KeybaseQuery;
import com.textuality.keybase.lib.Proof;
import com.textuality.keybase.lib.prover.Prover;
import org.json.JSONObject;
import org.spongycastle.openpgp.PGPUtil;
import org.sufficientlysecure.keychain.R;
import org.sufficientlysecure.keychain.operations.results.DecryptVerifyResult;
import org.sufficientlysecure.keychain.operations.results.KeybaseVerificationResult;
import org.sufficientlysecure.keychain.operations.results.OperationResult;
import org.sufficientlysecure.keychain.pgp.PgpDecryptVerifyInputParcel;
import org.sufficientlysecure.keychain.pgp.PgpDecryptVerifyOperation;
import org.sufficientlysecure.keychain.pgp.Progressable;
import org.sufficientlysecure.keychain.provider.ProviderHelper;
import org.sufficientlysecure.keychain.service.KeybaseVerificationParcel;
import org.sufficientlysecure.keychain.service.input.CryptoInputParcel;
import org.sufficientlysecure.keychain.service.input.RequiredInputParcel;
import org.sufficientlysecure.keychain.util.OkHttpKeybaseClient;
import org.sufficientlysecure.keychain.util.Preferences;
import org.sufficientlysecure.keychain.util.orbot.OrbotHelper;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.net.Proxy;
import java.util.ArrayList;
import java.util.List;
import de.measite.minidns.Client;
import de.measite.minidns.DNSMessage;
import de.measite.minidns.Question;
import de.measite.minidns.Record;
import de.measite.minidns.record.Data;
import de.measite.minidns.record.TXT;
public class KeybaseVerificationOperation extends BaseOperation<KeybaseVerificationParcel> {
public KeybaseVerificationOperation(Context context, ProviderHelper providerHelper,
Progressable progressable) {
super(context, providerHelper, progressable);
}
@NonNull
@Override
public KeybaseVerificationResult execute(KeybaseVerificationParcel keybaseInput,
CryptoInputParcel cryptoInput) {
Proxy proxy;
if (cryptoInput.getParcelableProxy() == null) {
// explicit proxy not set
if (!OrbotHelper.isOrbotInRequiredState(mContext)) {
return new KeybaseVerificationResult(null,
RequiredInputParcel.createOrbotRequiredOperation(), cryptoInput);
}
proxy = Preferences.getPreferences(mContext).getProxyPrefs()
.parcelableProxy.getProxy();
} else {
proxy = cryptoInput.getParcelableProxy().getProxy();
}
String requiredFingerprint = keybaseInput.mRequiredFingerprint;
OperationResult.OperationLog log = new OperationResult.OperationLog();
log.add(OperationResult.LogType.MSG_KEYBASE_VERIFICATION, 0, requiredFingerprint);
try {
KeybaseQuery keybaseQuery = new KeybaseQuery(new OkHttpKeybaseClient());
keybaseQuery.setProxy(proxy);
String keybaseProof = keybaseInput.mKeybaseProof;
Proof proof = new Proof(new JSONObject(keybaseProof));
mProgressable.setProgress(R.string.keybase_message_fetching_data, 0, 100);
Prover prover = Prover.findProverFor(proof);
if (prover == null) {
log.add(OperationResult.LogType.MSG_KEYBASE_ERROR_NO_PROVER, 1,
proof.getPrettyName());
return new KeybaseVerificationResult(OperationResult.RESULT_ERROR, log);
}
if (!prover.fetchProofData(keybaseQuery)) {
log.add(OperationResult.LogType.MSG_KEYBASE_ERROR_FETCH_PROOF, 1);
return new KeybaseVerificationResult(OperationResult.RESULT_ERROR, log);
}
if (!prover.checkFingerprint(requiredFingerprint)) {
log.add(OperationResult.LogType.MSG_KEYBASE_ERROR_FINGERPRINT_MISMATCH, 1);
return new KeybaseVerificationResult(OperationResult.RESULT_ERROR, log);
}
String domain = prover.dnsTxtCheckRequired();
if (domain != null) {
DNSMessage dnsQuery = new Client().query(new Question(domain, Record.TYPE.TXT));
if (dnsQuery == null) {
log.add(OperationResult.LogType.MSG_KEYBASE_ERROR_DNS_FAIL, 1);
log.add(OperationResult.LogType.MSG_KEYBASE_ERROR_SPECIFIC, 2,
getFlattenedProverLog(prover));
return new KeybaseVerificationResult(OperationResult.RESULT_ERROR, log);
}
Record[] records = dnsQuery.getAnswers();
List<List<byte[]>> extents = new ArrayList<>();
for (Record r : records) {
Data d = r.getPayload();
if (d instanceof TXT) {
extents.add(((TXT) d).getExtents());
}
}
if (!prover.checkDnsTxt(extents)) {
log.add(OperationResult.LogType.MSG_KEYBASE_ERROR_SPECIFIC, 1,
getFlattenedProverLog(prover));
return new KeybaseVerificationResult(OperationResult.RESULT_ERROR, log);
}
}
byte[] messageBytes = prover.getPgpMessage().getBytes();
if (prover.rawMessageCheckRequired()) {
InputStream messageByteStream = PGPUtil.getDecoderStream(new
ByteArrayInputStream
(messageBytes));
if (!prover.checkRawMessageBytes(messageByteStream)) {
log.add(OperationResult.LogType.MSG_KEYBASE_ERROR_SPECIFIC, 1,
getFlattenedProverLog(prover));
return new KeybaseVerificationResult(OperationResult.RESULT_ERROR, log);
}
}
PgpDecryptVerifyOperation op = new PgpDecryptVerifyOperation(mContext, mProviderHelper, mProgressable);
PgpDecryptVerifyInputParcel input = new PgpDecryptVerifyInputParcel(messageBytes)
.setRequiredSignerFingerprint(requiredFingerprint);
DecryptVerifyResult decryptVerifyResult = op.execute(input, new CryptoInputParcel());
if (!decryptVerifyResult.success()) {
log.add(decryptVerifyResult, 1);
return new KeybaseVerificationResult(OperationResult.RESULT_ERROR, log);
}
if (!prover.validate(new String(decryptVerifyResult.getOutputBytes()))) {
log.add(OperationResult.LogType.MSG_KEYBASE_ERROR_PAYLOAD_MISMATCH, 1);
return new KeybaseVerificationResult(OperationResult.RESULT_ERROR, log);
}
return new KeybaseVerificationResult(OperationResult.RESULT_OK, log, prover);
} catch (Exception e) {
// just adds the passed parameter, in this case e.getMessage()
log.add(OperationResult.LogType.MSG_KEYBASE_ERROR_SPECIFIC, 1, e.getMessage());
return new KeybaseVerificationResult(OperationResult.RESULT_ERROR, log);
}
}
private String getFlattenedProverLog(Prover prover) {
String log = "";
for (String line : prover.getLog()) {
log += line + "\n";
}
return log;
}
}
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