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package de.pixart.messenger.crypto;
import android.app.PendingIntent;
import android.content.Intent;
import android.util.Log;
import org.openintents.openpgp.OpenPgpError;
import org.openintents.openpgp.OpenPgpSignatureResult;
import org.openintents.openpgp.util.OpenPgpApi;
import org.openintents.openpgp.util.OpenPgpApi.IOpenPgpCallback;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import de.pixart.messenger.Config;
import de.pixart.messenger.R;
import de.pixart.messenger.entities.Account;
import de.pixart.messenger.entities.Contact;
import de.pixart.messenger.entities.Conversation;
import de.pixart.messenger.entities.DownloadableFile;
import de.pixart.messenger.entities.Message;
import de.pixart.messenger.persistance.FileBackend;
import de.pixart.messenger.services.XmppConnectionService;
import de.pixart.messenger.ui.UiCallback;
public class PgpEngine {
private OpenPgpApi api;
private XmppConnectionService mXmppConnectionService;
public PgpEngine(OpenPgpApi api, XmppConnectionService service) {
this.api = api;
this.mXmppConnectionService = service;
}
private static void logError(Account account, OpenPgpError error) {
if (error != null) {
Log.d(Config.LOGTAG, account.getJid().asBareJid().toString() + ": OpenKeychain error '" + error.getMessage() + "' code=" + error.getErrorId());
} else {
Log.d(Config.LOGTAG, account.getJid().asBareJid().toString() + ": OpenKeychain error with no message");
}
}
public void encrypt(final Message message, final UiCallback<Message> callback) {
Intent params = new Intent();
params.setAction(OpenPgpApi.ACTION_ENCRYPT);
final Conversation conversation = message.getConversation();
if (conversation.getMode() == Conversation.MODE_SINGLE) {
long[] keys = {
conversation.getContact().getPgpKeyId(),
conversation.getAccount().getPgpId()
};
params.putExtra(OpenPgpApi.EXTRA_KEY_IDS, keys);
} else {
params.putExtra(OpenPgpApi.EXTRA_KEY_IDS, conversation.getMucOptions().getPgpKeyIds());
}
if (!message.needsUploading()) {
params.putExtra(OpenPgpApi.EXTRA_REQUEST_ASCII_ARMOR, true);
String body;
if (message.hasFileOnRemoteHost()) {
body = message.getFileParams().url.toString();
} else {
body = message.getBody();
}
InputStream is = new ByteArrayInputStream(body.getBytes());
final OutputStream os = new ByteArrayOutputStream();
api.executeApiAsync(params, is, os, result -> {
switch (result.getIntExtra(OpenPgpApi.RESULT_CODE, OpenPgpApi.RESULT_CODE_ERROR)) {
case OpenPgpApi.RESULT_CODE_SUCCESS:
try {
os.flush();
StringBuilder encryptedMessageBody = new StringBuilder();
String[] lines = os.toString().split("\n");
for (int i = 2; i < lines.length - 1; ++i) {
if (!lines[i].contains("Version")) {
encryptedMessageBody.append(lines[i].trim());
}
}
message.setEncryptedBody(encryptedMessageBody.toString());
message.setEncryption(Message.ENCRYPTION_DECRYPTED);
mXmppConnectionService.sendMessage(message);
callback.success(message);
} catch (IOException e) {
callback.error(R.string.openpgp_error, message);
}
break;
case OpenPgpApi.RESULT_CODE_USER_INTERACTION_REQUIRED:
callback.userInputRequried(result.getParcelableExtra(OpenPgpApi.RESULT_INTENT), message);
break;
case OpenPgpApi.RESULT_CODE_ERROR:
logError(conversation.getAccount(), result.getParcelableExtra(OpenPgpApi.RESULT_ERROR));
callback.error(R.string.openpgp_error, message);
break;
}
});
} else {
try {
DownloadableFile inputFile = this.mXmppConnectionService
.getFileBackend().getFile(message, true);
DownloadableFile outputFile = this.mXmppConnectionService
.getFileBackend().getFile(message, false);
outputFile.getParentFile().mkdirs();
outputFile.createNewFile();
final InputStream is = new FileInputStream(inputFile);
final OutputStream os = new FileOutputStream(outputFile);
api.executeApiAsync(params, is, os, result -> {
switch (result.getIntExtra(OpenPgpApi.RESULT_CODE, OpenPgpApi.RESULT_CODE_ERROR)) {
case OpenPgpApi.RESULT_CODE_SUCCESS:
try {
os.flush();
} catch (IOException ignored) {
//ignored
}
FileBackend.close(os);
mXmppConnectionService.sendMessage(message);
callback.success(message);
break;
case OpenPgpApi.RESULT_CODE_USER_INTERACTION_REQUIRED:
callback.userInputRequried(result.getParcelableExtra(OpenPgpApi.RESULT_INTENT), message);
break;
case OpenPgpApi.RESULT_CODE_ERROR:
logError(conversation.getAccount(), result.getParcelableExtra(OpenPgpApi.RESULT_ERROR));
callback.error(R.string.openpgp_error, message);
break;
}
});
} catch (final IOException e) {
callback.error(R.string.openpgp_error, message);
}
}
}
public long fetchKeyId(Account account, String status, String signature) {
if ((signature == null) || (api == null)) {
return 0;
}
if (status == null) {
status = "";
}
final StringBuilder pgpSig = new StringBuilder();
pgpSig.append("-----BEGIN PGP SIGNED MESSAGE-----");
pgpSig.append('\n');
pgpSig.append('\n');
pgpSig.append(status);
pgpSig.append('\n');
pgpSig.append("-----BEGIN PGP SIGNATURE-----");
pgpSig.append('\n');
pgpSig.append('\n');
pgpSig.append(signature.replace("\n", "").trim());
pgpSig.append('\n');
pgpSig.append("-----END PGP SIGNATURE-----");
Intent params = new Intent();
params.setAction(OpenPgpApi.ACTION_DECRYPT_VERIFY);
params.putExtra(OpenPgpApi.EXTRA_REQUEST_ASCII_ARMOR, true);
InputStream is = new ByteArrayInputStream(pgpSig.toString().getBytes());
ByteArrayOutputStream os = new ByteArrayOutputStream();
Intent result = api.executeApi(params, is, os);
switch (result.getIntExtra(OpenPgpApi.RESULT_CODE,
OpenPgpApi.RESULT_CODE_ERROR)) {
case OpenPgpApi.RESULT_CODE_SUCCESS:
OpenPgpSignatureResult sigResult = result
.getParcelableExtra(OpenPgpApi.RESULT_SIGNATURE);
if (sigResult != null) {
return sigResult.getKeyId();
} else {
return 0;
}
case OpenPgpApi.RESULT_CODE_USER_INTERACTION_REQUIRED:
return 0;
case OpenPgpApi.RESULT_CODE_ERROR:
logError(account, (OpenPgpError) result.getParcelableExtra(OpenPgpApi.RESULT_ERROR));
return 0;
}
return 0;
}
public void chooseKey(final Account account, final UiCallback<Account> callback) {
Intent p = new Intent();
p.setAction(OpenPgpApi.ACTION_GET_SIGN_KEY_ID);
api.executeApiAsync(p, null, null, result -> {
switch (result.getIntExtra(OpenPgpApi.RESULT_CODE, 0)) {
case OpenPgpApi.RESULT_CODE_SUCCESS:
callback.success(account);
return;
case OpenPgpApi.RESULT_CODE_USER_INTERACTION_REQUIRED:
callback.userInputRequried(result.getParcelableExtra(OpenPgpApi.RESULT_INTENT), account);
return;
case OpenPgpApi.RESULT_CODE_ERROR:
logError(account, result.getParcelableExtra(OpenPgpApi.RESULT_ERROR));
callback.error(R.string.openpgp_error, account);
}
});
}
public void generateSignature(Intent intent, final Account account, String status, final UiCallback<String> callback) {
if (account.getPgpId() == 0) {
return;
}
Intent params = intent == null ? new Intent() : intent;
params.setAction(OpenPgpApi.ACTION_CLEARTEXT_SIGN);
params.putExtra(OpenPgpApi.EXTRA_REQUEST_ASCII_ARMOR, true);
params.putExtra(OpenPgpApi.EXTRA_SIGN_KEY_ID, account.getPgpId());
InputStream is = new ByteArrayInputStream(status.getBytes());
final OutputStream os = new ByteArrayOutputStream();
Log.d(Config.LOGTAG, account.getJid().asBareJid() + ": signing status message \"" + status + "\"");
api.executeApiAsync(params, is, os, result -> {
switch (result.getIntExtra(OpenPgpApi.RESULT_CODE, 0)) {
case OpenPgpApi.RESULT_CODE_SUCCESS:
StringBuilder signatureBuilder = new StringBuilder();
try {
os.flush();
String[] lines = os.toString().split("\n");
boolean sig = false;
for (String line : lines) {
if (sig) {
if (line.contains("END PGP SIGNATURE")) {
sig = false;
} else {
if (!line.contains("Version")) {
signatureBuilder.append(line.trim());
}
}
}
if (line.contains("BEGIN PGP SIGNATURE")) {
sig = true;
}
}
} catch (IOException e) {
callback.error(R.string.openpgp_error, null);
return;
}
callback.success(signatureBuilder.toString());
return;
case OpenPgpApi.RESULT_CODE_USER_INTERACTION_REQUIRED:
callback.userInputRequried(result.getParcelableExtra(OpenPgpApi.RESULT_INTENT), status);
return;
case OpenPgpApi.RESULT_CODE_ERROR:
OpenPgpError error = result.getParcelableExtra(OpenPgpApi.RESULT_ERROR);
if (error != null && "signing subkey not found!".equals(error.getMessage())) {
callback.error(0, null);
} else {
logError(account, error);
callback.error(R.string.unable_to_connect_to_keychain, null);
}
}
});
}
public void hasKey(final Contact contact, final UiCallback<Contact> callback) {
Intent params = new Intent();
params.setAction(OpenPgpApi.ACTION_GET_KEY);
params.putExtra(OpenPgpApi.EXTRA_KEY_ID, contact.getPgpKeyId());
api.executeApiAsync(params, null, null, new IOpenPgpCallback() {
@Override
public void onReturn(Intent result) {
switch (result.getIntExtra(OpenPgpApi.RESULT_CODE, 0)) {
case OpenPgpApi.RESULT_CODE_SUCCESS:
callback.success(contact);
return;
case OpenPgpApi.RESULT_CODE_USER_INTERACTION_REQUIRED:
callback.userInputRequried(result.getParcelableExtra(OpenPgpApi.RESULT_INTENT), contact);
return;
case OpenPgpApi.RESULT_CODE_ERROR:
logError(contact.getAccount(), result.getParcelableExtra(OpenPgpApi.RESULT_ERROR));
callback.error(R.string.openpgp_error, contact);
}
}
});
}
public PendingIntent getIntentForKey(long pgpKeyId) {
Intent params = new Intent();
params.setAction(OpenPgpApi.ACTION_GET_KEY);
params.putExtra(OpenPgpApi.EXTRA_KEY_ID, pgpKeyId);
Intent result = api.executeApi(params, null, null);
return (PendingIntent) result.getParcelableExtra(OpenPgpApi.RESULT_INTENT);
}
}
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