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package org.sufficientlysecure.keychain.operations;
import android.content.Context;
import com.textuality.keybase.lib.Proof;
import com.textuality.keybase.lib.prover.Prover;
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;
import org.json.JSONObject;
import org.spongycastle.openpgp.PGPUtil;
import org.sufficientlysecure.keychain.Constants;
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.PgpDecryptVerify;
import org.sufficientlysecure.keychain.pgp.PgpDecryptVerifyInputParcel;
import org.sufficientlysecure.keychain.pgp.Progressable;
import org.sufficientlysecure.keychain.provider.ProviderHelper;
import org.sufficientlysecure.keychain.service.KeybaseVerificationParcel;
import org.sufficientlysecure.keychain.service.ServiceProgressHandler;
import org.sufficientlysecure.keychain.service.input.CryptoInputParcel;
import org.sufficientlysecure.keychain.util.Log;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
public class KeybaseVerificationOperation extends BaseOperation<KeybaseVerificationParcel> {
public KeybaseVerificationOperation(Context context, ProviderHelper providerHelper,
Progressable progressable) {
super(context, providerHelper, progressable);
}
@Override
public KeybaseVerificationResult execute(KeybaseVerificationParcel keybaseInput,
CryptoInputParcel cryptoInput) {
String requiredFingerprint = keybaseInput.mRequiredFingerprint;
OperationResult.OperationLog log = new OperationResult.OperationLog();
log.add(OperationResult.LogType.MSG_KEYBASE_VERIFICATION, 0, requiredFingerprint);
try {
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()) {
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<List<byte[]>>();
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);
}
}
PgpDecryptVerify op = new PgpDecryptVerify(mContext, mProviderHelper, mProgressable);
PgpDecryptVerifyInputParcel input = new PgpDecryptVerifyInputParcel(messageBytes)
.setSignedLiteralData(true)
.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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