diff options
Diffstat (limited to 'OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/PassphraseDialogActivity.java')
-rw-r--r-- | OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/PassphraseDialogActivity.java | 367 |
1 files changed, 367 insertions, 0 deletions
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/PassphraseDialogActivity.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/PassphraseDialogActivity.java new file mode 100644 index 000000000..fa9444862 --- /dev/null +++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/PassphraseDialogActivity.java @@ -0,0 +1,367 @@ +/* + * Copyright (C) 2014 Dominik Schürmann <dominik@dominikschuermann.de> + * + * 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.ui; + +import android.app.Activity; +import android.app.AlertDialog; +import android.app.Dialog; +import android.content.Context; +import android.content.DialogInterface; +import android.content.Intent; +import android.os.AsyncTask; +import android.os.Bundle; +import android.os.Messenger; +import android.support.v4.app.DialogFragment; +import android.support.v4.app.FragmentActivity; +import android.view.KeyEvent; +import android.view.LayoutInflater; +import android.view.View; +import android.view.WindowManager; +import android.view.inputmethod.EditorInfo; +import android.view.inputmethod.InputMethodManager; +import android.widget.Button; +import android.widget.EditText; +import android.widget.TextView; +import android.widget.Toast; + +import org.sufficientlysecure.keychain.Constants; +import org.sufficientlysecure.keychain.R; +import org.sufficientlysecure.keychain.compatibility.DialogFragmentWorkaround; +import org.sufficientlysecure.keychain.pgp.CanonicalizedSecretKey; +import org.sufficientlysecure.keychain.pgp.CanonicalizedSecretKeyRing; +import org.sufficientlysecure.keychain.pgp.exception.PgpGeneralException; +import org.sufficientlysecure.keychain.provider.CachedPublicKeyRing; +import org.sufficientlysecure.keychain.provider.KeychainContract; +import org.sufficientlysecure.keychain.provider.ProviderHelper; +import org.sufficientlysecure.keychain.service.PassphraseCacheService; +import org.sufficientlysecure.keychain.ui.dialog.CustomAlertDialogBuilder; +import org.sufficientlysecure.keychain.util.Log; + +/** + * We can not directly create a dialog on the application context. + * This activity encapsulates a DialogFragment to emulate a dialog. + */ +public class PassphraseDialogActivity extends FragmentActivity { + public static final String MESSAGE_DATA_PASSPHRASE = "passphrase"; + + public static final String EXTRA_SECRET_KEY_ID = "secret_key_id"; + + @Override + protected void onCreate(Bundle savedInstanceState) { + super.onCreate(savedInstanceState); + + // do not allow screenshots of passphrase input + // to prevent "too easy" passphrase theft by root apps + if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.HONEYCOMB) { + getWindow().setFlags( + WindowManager.LayoutParams.FLAG_SECURE, + WindowManager.LayoutParams.FLAG_SECURE + ); + } + + // this activity itself has no content view (see manifest) + + long keyId = getIntent().getLongExtra(EXTRA_SECRET_KEY_ID, 0); + + show(this, keyId); + } + + /** + * Shows passphrase dialog to cache a new passphrase the user enters for using it later for + * encryption. Based on mSecretKeyId it asks for a passphrase to open a private key or it asks + * for a symmetric passphrase + */ + public static void show(final FragmentActivity context, final long keyId) { + DialogFragmentWorkaround.INTERFACE.runnableRunDelayed(new Runnable() { + public void run() { + // do NOT check if the key even needs a passphrase. that's not our job here. + PassphraseDialogFragment frag = new PassphraseDialogFragment(); + Bundle args = new Bundle(); + args.putLong(EXTRA_SECRET_KEY_ID, keyId); + + frag.setArguments(args); + + frag.show(context.getSupportFragmentManager(), "passphraseDialog"); + } + }); + } + + public static class PassphraseDialogFragment extends DialogFragment implements TextView.OnEditorActionListener { + private Messenger mMessenger; + private EditText mPassphraseEditText; + private View mInput, mProgress; + + CanonicalizedSecretKeyRing mSecretRing = null; + boolean mIsCancelled = false; + long mSubKeyId; + + /** + * Creates dialog + */ + @Override + public Dialog onCreateDialog(Bundle savedInstanceState) { + final Activity activity = getActivity(); + mSubKeyId = getArguments().getLong(EXTRA_SECRET_KEY_ID); + + CustomAlertDialogBuilder alert = new CustomAlertDialogBuilder(activity); + + alert.setTitle(R.string.title_authentication); + + String userId; + + if (mSubKeyId == Constants.key.symmetric || mSubKeyId == Constants.key.none) { + alert.setMessage(R.string.passphrase_for_symmetric_encryption); + } else { + String message; + try { + ProviderHelper helper = new ProviderHelper(activity); + mSecretRing = helper.getCanonicalizedSecretKeyRing( + KeychainContract.KeyRings.buildUnifiedKeyRingsFindBySubkeyUri(mSubKeyId)); + // yes the inner try/catch block is necessary, otherwise the final variable + // above can't be statically verified to have been set in all cases because + // the catch clause doesn't return. + try { + userId = mSecretRing.getPrimaryUserIdWithFallback(); + } catch (PgpGeneralException e) { + userId = null; + } + + /* Get key type for message */ + // find a master key id for our key + long masterKeyId = new ProviderHelper(getActivity()).getMasterKeyId(mSubKeyId); + CachedPublicKeyRing keyRing = new ProviderHelper(getActivity()).getCachedPublicKeyRing(masterKeyId); + // get the type of key (from the database) + CanonicalizedSecretKey.SecretKeyType keyType = keyRing.getSecretKeyType(mSubKeyId); + switch (keyType) { + case PASSPHRASE: + message = getString(R.string.passphrase_for, userId); + break; + case DIVERT_TO_CARD: + message = getString(R.string.yubikey_pin, userId); + break; + default: + message = "This should not happen!"; + break; + } + + } catch (ProviderHelper.NotFoundException e) { + alert.setTitle(R.string.title_key_not_found); + alert.setMessage(getString(R.string.key_not_found, mSubKeyId)); + alert.setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() { + public void onClick(DialogInterface dialog, int which) { + dismiss(); + } + }); + alert.setCancelable(false); + return alert.create(); + } + + alert.setMessage(message); + } + + LayoutInflater inflater = activity.getLayoutInflater(); + View view = inflater.inflate(R.layout.passphrase_dialog, null); + alert.setView(view); + + mPassphraseEditText = (EditText) view.findViewById(R.id.passphrase_passphrase); + mInput = view.findViewById(R.id.input); + mProgress = view.findViewById(R.id.progress); + + alert.setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() { + + @Override + public void onClick(DialogInterface dialog, int id) { + dialog.cancel(); + } + }); + + // Hack to open keyboard. + // This is the only method that I found to work across all Android versions + // http://turbomanage.wordpress.com/2012/05/02/show-soft-keyboard-automatically-when-edittext-receives-focus/ + // Notes: * onCreateView can't be used because we want to add buttons to the dialog + // * opening in onActivityCreated does not work on Android 4.4 + mPassphraseEditText.setOnFocusChangeListener(new View.OnFocusChangeListener() { + @Override + public void onFocusChange(View v, boolean hasFocus) { + mPassphraseEditText.post(new Runnable() { + @Override + public void run() { + InputMethodManager imm = (InputMethodManager) getActivity() + .getSystemService(Context.INPUT_METHOD_SERVICE); + imm.showSoftInput(mPassphraseEditText, InputMethodManager.SHOW_IMPLICIT); + } + }); + } + }); + mPassphraseEditText.requestFocus(); + + mPassphraseEditText.setImeActionLabel(getString(android.R.string.ok), EditorInfo.IME_ACTION_DONE); + mPassphraseEditText.setOnEditorActionListener(this); + + AlertDialog dialog = alert.create(); + dialog.setButton(DialogInterface.BUTTON_POSITIVE, + activity.getString(android.R.string.ok), (DialogInterface.OnClickListener) null); + + return dialog; + } + + @Override + public void onStart() { + super.onStart(); + + // Override the default behavior so the dialog is NOT dismissed on click + final Button positive = ((AlertDialog) getDialog()).getButton(DialogInterface.BUTTON_POSITIVE); + positive.setOnClickListener(new View.OnClickListener() { + @Override + public void onClick(View v) { + final String passphrase = mPassphraseEditText.getText().toString(); + + // Early breakout if we are dealing with a symmetric key + if (mSecretRing == null) { + PassphraseCacheService.addCachedPassphrase(getActivity(), Constants.key.symmetric, + passphrase, getString(R.string.passp_cache_notif_pwd)); + // also return passphrase back to activity + Intent returnIntent = new Intent(); + returnIntent.putExtra(MESSAGE_DATA_PASSPHRASE, passphrase); + getActivity().setResult(RESULT_OK, returnIntent); + dismiss(); + getActivity().finish(); + return; + } + + mInput.setVisibility(View.GONE); + mProgress.setVisibility(View.VISIBLE); + positive.setEnabled(false); + + new AsyncTask<Void, Void, Boolean>() { + @Override + protected Boolean doInBackground(Void... params) { + try { + // wait some 100ms here, give the user time to appreciate the progress bar + try { + Thread.sleep(100); + } catch (InterruptedException e) { + // never mind + } + // make sure this unlocks + return mSecretRing.getSecretKey(mSubKeyId).unlock(passphrase); + } catch (PgpGeneralException e) { + Toast.makeText(getActivity(), R.string.error_could_not_extract_private_key, + Toast.LENGTH_SHORT).show(); + + getActivity().setResult(RESULT_CANCELED); + dismiss(); + getActivity().finish(); + return false; + } + } + + /** Handle a good or bad passphrase. This happens in the UI thread! */ + @Override + protected void onPostExecute(Boolean result) { + super.onPostExecute(result); + + // if we were cancelled in the meantime, the result isn't relevant anymore + if (mIsCancelled) { + return; + } + + // if the passphrase was wrong, reset and re-enable the dialogue + if (!result) { + mPassphraseEditText.setText(""); + mPassphraseEditText.setError(getString(R.string.wrong_passphrase)); + mInput.setVisibility(View.VISIBLE); + mProgress.setVisibility(View.GONE); + positive.setEnabled(true); + return; + } + + // cache the new passphrase + Log.d(Constants.TAG, "Everything okay! Caching entered passphrase"); + + try { + PassphraseCacheService.addCachedPassphrase(getActivity(), mSubKeyId, + passphrase, mSecretRing.getPrimaryUserIdWithFallback()); + } catch (PgpGeneralException e) { + Log.e(Constants.TAG, "adding of a passphrase failed", e); + } + + // also return passphrase back to activity + Intent returnIntent = new Intent(); + returnIntent.putExtra(MESSAGE_DATA_PASSPHRASE, passphrase); + getActivity().setResult(RESULT_OK, returnIntent); + dismiss(); + getActivity().finish(); + } + }.execute(); + } + }); + + } + + @Override + public void onCancel(DialogInterface dialog) { + super.onCancel(dialog); + + // note we need no synchronization here, this variable is only accessed in the ui thread + mIsCancelled = true; + + // dismiss the dialogue + getActivity().setResult(RESULT_CANCELED); + dismiss(); + getActivity().finish(); + } + + @Override + public void onDismiss(DialogInterface dialog) { + super.onDismiss(dialog); + Log.d(Constants.TAG, "onDismiss"); + + // hide keyboard on dismiss + hideKeyboard(); + } + + private void hideKeyboard() { + InputMethodManager inputManager = (InputMethodManager) getActivity() + .getSystemService(Context.INPUT_METHOD_SERVICE); + + //check if no view has focus: + View v = getActivity().getCurrentFocus(); + if (v == null) + return; + + inputManager.hideSoftInputFromWindow(v.getWindowToken(), 0); + } + + /** + * Associate the "done" button on the soft keyboard with the okay button in the view + */ + @Override + public boolean onEditorAction(TextView v, int actionId, KeyEvent event) { + if (EditorInfo.IME_ACTION_DONE == actionId) { + AlertDialog dialog = ((AlertDialog) getDialog()); + Button bt = dialog.getButton(AlertDialog.BUTTON_POSITIVE); + + bt.performClick(); + return true; + } + return false; + } + + } +} |