1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
|
/*
* 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");
}
}
}
|