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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.security;
import android.accounts.Account;
import android.accounts.AccountManager;
import android.accounts.AccountManagerFuture;
import android.accounts.AuthenticatorException;
import android.accounts.OperationCanceledException;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.os.Looper;
import android.os.RemoteException;
import java.io.ByteArrayInputStream;
import java.io.Closeable;
import java.io.IOException;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.cert.Certificate;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
/**
* @hide
*/
public final class KeyChain {
private static final String TAG = "KeyChain";
/**
* @hide Also used by KeyChainService implementation
*/
public static final String ACCOUNT_TYPE = "com.android.keychain";
/**
* Returns an {@code Intent} for use with {@link
* android.app.Activity#startActivityForResult
* startActivityForResult}. The result will be returned via {@link
* android.app.Activity#onActivityResult onActivityResult} with
* {@link android.app.Activity#RESULT_OK RESULT_OK} and the alias
* in the returned {@code Intent}'s extra data with key {@link
* android.content.Intent#EXTRA_TEXT Intent.EXTRA_TEXT}.
*/
public static Intent chooseAlias() {
return new Intent("com.android.keychain.CHOOSER");
}
/**
* Returns a new {@code KeyChainResult} instance.
*/
public static KeyChainResult get(Context context, String alias)
throws InterruptedException, RemoteException {
if (alias == null) {
throw new NullPointerException("alias == null");
}
KeyChainConnection keyChainConnection = bind(context);
try {
// Account is created if necessary during binding of the IKeyChainService
AccountManager accountManager = AccountManager.get(context);
Account account = accountManager.getAccountsByType(ACCOUNT_TYPE)[0];
AccountManagerFuture<Bundle> future = accountManager.getAuthToken(account,
alias,
false,
null,
null);
Bundle bundle;
try {
bundle = future.getResult();
} catch (OperationCanceledException e) {
throw new AssertionError(e);
} catch (IOException e) {
throw new AssertionError(e);
} catch (AuthenticatorException e) {
throw new AssertionError(e);
}
Intent intent = bundle.getParcelable(AccountManager.KEY_INTENT);
if (intent != null) {
Bundle result = new Bundle();
// we don't want this Eclair compatability flag,
// it will prevent onActivityResult from being called
intent.setFlags(intent.getFlags() & ~Intent.FLAG_ACTIVITY_NEW_TASK);
return new KeyChainResult(intent);
}
String authToken = bundle.getString(AccountManager.KEY_AUTHTOKEN);
if (authToken == null) {
throw new AssertionError("Invalid authtoken");
}
IKeyChainService keyChainService = keyChainConnection.getService();
byte[] privateKeyBytes = keyChainService.getPrivateKey(alias, authToken);
byte[] certificateBytes = keyChainService.getCertificate(alias, authToken);
return new KeyChainResult(toPrivateKey(privateKeyBytes),
toCertificate(certificateBytes));
} finally {
keyChainConnection.close();
}
}
private static PrivateKey toPrivateKey(byte[] bytes) {
if (bytes == null) {
throw new IllegalArgumentException("bytes == null");
}
try {
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
return keyFactory.generatePrivate(new PKCS8EncodedKeySpec(bytes));
} catch (NoSuchAlgorithmException e) {
throw new AssertionError(e);
} catch (InvalidKeySpecException e) {
throw new AssertionError(e);
}
}
private static X509Certificate toCertificate(byte[] bytes) {
if (bytes == null) {
throw new IllegalArgumentException("bytes == null");
}
try {
CertificateFactory certFactory = CertificateFactory.getInstance("X.509");
Certificate cert = certFactory.generateCertificate(new ByteArrayInputStream(bytes));
return (X509Certificate) cert;
} catch (CertificateException e) {
throw new AssertionError(e);
}
}
/**
* @hide for reuse by CertInstaller and Settings.
* @see KeyChain#bind
*/
public final static class KeyChainConnection implements Closeable {
private final Context context;
private final ServiceConnection serviceConnection;
private final IKeyChainService service;
private KeyChainConnection(Context context,
ServiceConnection serviceConnection,
IKeyChainService service) {
this.context = context;
this.serviceConnection = serviceConnection;
this.service = service;
}
@Override public void close() {
context.unbindService(serviceConnection);
}
public IKeyChainService getService() {
return service;
}
}
/**
* @hide for reuse by CertInstaller and Settings.
*
* Caller should call unbindService on the result when finished.
*/
public static KeyChainConnection bind(Context context) throws InterruptedException {
if (context == null) {
throw new NullPointerException("context == null");
}
ensureNotOnMainThread(context);
final BlockingQueue<IKeyChainService> q = new LinkedBlockingQueue<IKeyChainService>(1);
ServiceConnection keyChainServiceConnection = new ServiceConnection() {
@Override public void onServiceConnected(ComponentName name, IBinder service) {
try {
q.put(IKeyChainService.Stub.asInterface(service));
} catch (InterruptedException e) {
throw new AssertionError(e);
}
}
@Override public void onServiceDisconnected(ComponentName name) {}
};
boolean isBound = context.bindService(new Intent(IKeyChainService.class.getName()),
keyChainServiceConnection,
Context.BIND_AUTO_CREATE);
if (!isBound) {
throw new AssertionError("could not bind to KeyChainService");
}
return new KeyChainConnection(context, keyChainServiceConnection, q.take());
}
private static void ensureNotOnMainThread(Context context) {
Looper looper = Looper.myLooper();
if (looper != null && looper == context.getMainLooper()) {
throw new IllegalStateException(
"calling this from your main thread can lead to deadlock");
}
}
}
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