Brian Carlstrom | 3e6251d | 2011-04-11 09:05:06 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2011 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package com.android.keychain; |
| 18 | |
Fred Quintana | fb2e18e | 2011-07-13 14:54:05 -0700 | [diff] [blame] | 19 | import android.app.IntentService; |
| 20 | import android.content.ContentValues; |
Brian Carlstrom | 3e6251d | 2011-04-11 09:05:06 -0700 | [diff] [blame] | 21 | import android.content.Context; |
| 22 | import android.content.Intent; |
Fred Quintana | fb2e18e | 2011-07-13 14:54:05 -0700 | [diff] [blame] | 23 | import android.content.pm.PackageManager; |
| 24 | import android.database.Cursor; |
| 25 | import android.database.DatabaseUtils; |
| 26 | import android.database.sqlite.SQLiteDatabase; |
| 27 | import android.database.sqlite.SQLiteOpenHelper; |
Kenny Root | 6f1f03b | 2012-03-08 10:30:39 -0800 | [diff] [blame] | 28 | import android.os.Binder; |
Brian Carlstrom | 3e6251d | 2011-04-11 09:05:06 -0700 | [diff] [blame] | 29 | import android.os.IBinder; |
Kenny Root | 6f1f03b | 2012-03-08 10:30:39 -0800 | [diff] [blame] | 30 | import android.os.Process; |
Julia Reynolds | 3fb7449 | 2014-06-30 16:54:50 -0400 | [diff] [blame^] | 31 | import android.os.UserManager; |
Brian Carlstrom | 3e6251d | 2011-04-11 09:05:06 -0700 | [diff] [blame] | 32 | import android.security.Credentials; |
| 33 | import android.security.IKeyChainService; |
Selim Gurun | 39e36e5 | 2012-02-14 10:50:42 -0800 | [diff] [blame] | 34 | import android.security.KeyChain; |
Brian Carlstrom | 3e6251d | 2011-04-11 09:05:06 -0700 | [diff] [blame] | 35 | import android.security.KeyStore; |
| 36 | import android.util.Log; |
| 37 | import java.io.ByteArrayInputStream; |
Brian Carlstrom | a58db54 | 2011-05-11 23:02:20 -0700 | [diff] [blame] | 38 | import java.io.IOException; |
Brian Carlstrom | 3e6251d | 2011-04-11 09:05:06 -0700 | [diff] [blame] | 39 | import java.security.cert.CertificateException; |
| 40 | import java.security.cert.CertificateFactory; |
| 41 | import java.security.cert.X509Certificate; |
Fred Quintana | fb2e18e | 2011-07-13 14:54:05 -0700 | [diff] [blame] | 42 | |
Kenny Root | 3048b6c | 2013-04-23 22:38:11 -0700 | [diff] [blame] | 43 | import com.android.org.conscrypt.TrustedCertificateStore; |
Brian Carlstrom | 3e6251d | 2011-04-11 09:05:06 -0700 | [diff] [blame] | 44 | |
Fred Quintana | fb2e18e | 2011-07-13 14:54:05 -0700 | [diff] [blame] | 45 | public class KeyChainService extends IntentService { |
Selim Gurun | 39e36e5 | 2012-02-14 10:50:42 -0800 | [diff] [blame] | 46 | |
Fred Quintana | fb2e18e | 2011-07-13 14:54:05 -0700 | [diff] [blame] | 47 | private static final String TAG = "KeyChain"; |
Brian Carlstrom | 3e6251d | 2011-04-11 09:05:06 -0700 | [diff] [blame] | 48 | |
Fred Quintana | fb2e18e | 2011-07-13 14:54:05 -0700 | [diff] [blame] | 49 | private static final String DATABASE_NAME = "grants.db"; |
| 50 | private static final int DATABASE_VERSION = 1; |
| 51 | private static final String TABLE_GRANTS = "grants"; |
| 52 | private static final String GRANTS_ALIAS = "alias"; |
| 53 | private static final String GRANTS_GRANTEE_UID = "uid"; |
Brian Carlstrom | 3e6251d | 2011-04-11 09:05:06 -0700 | [diff] [blame] | 54 | |
Fred Quintana | fb2e18e | 2011-07-13 14:54:05 -0700 | [diff] [blame] | 55 | /** created in onCreate(), closed in onDestroy() */ |
| 56 | public DatabaseHelper mDatabaseHelper; |
Brian Carlstrom | 3e6251d | 2011-04-11 09:05:06 -0700 | [diff] [blame] | 57 | |
Fred Quintana | fb2e18e | 2011-07-13 14:54:05 -0700 | [diff] [blame] | 58 | private static final String SELECTION_COUNT_OF_MATCHING_GRANTS = |
| 59 | "SELECT COUNT(*) FROM " + TABLE_GRANTS |
| 60 | + " WHERE " + GRANTS_GRANTEE_UID + "=? AND " + GRANTS_ALIAS + "=?"; |
| 61 | |
| 62 | private static final String SELECT_GRANTS_BY_UID_AND_ALIAS = |
| 63 | GRANTS_GRANTEE_UID + "=? AND " + GRANTS_ALIAS + "=?"; |
| 64 | |
| 65 | private static final String SELECTION_GRANTS_BY_UID = GRANTS_GRANTEE_UID + "=?"; |
| 66 | |
| 67 | public KeyChainService() { |
| 68 | super(KeyChainService.class.getSimpleName()); |
| 69 | } |
Brian Carlstrom | 3e6251d | 2011-04-11 09:05:06 -0700 | [diff] [blame] | 70 | |
| 71 | @Override public void onCreate() { |
| 72 | super.onCreate(); |
Fred Quintana | fb2e18e | 2011-07-13 14:54:05 -0700 | [diff] [blame] | 73 | mDatabaseHelper = new DatabaseHelper(this); |
| 74 | } |
| 75 | |
| 76 | @Override |
| 77 | public void onDestroy() { |
| 78 | super.onDestroy(); |
| 79 | mDatabaseHelper.close(); |
| 80 | mDatabaseHelper = null; |
Brian Carlstrom | 3e6251d | 2011-04-11 09:05:06 -0700 | [diff] [blame] | 81 | } |
| 82 | |
| 83 | private final IKeyChainService.Stub mIKeyChainService = new IKeyChainService.Stub() { |
Brian Carlstrom | 3e6251d | 2011-04-11 09:05:06 -0700 | [diff] [blame] | 84 | private final KeyStore mKeyStore = KeyStore.getInstance(); |
Brian Carlstrom | a58db54 | 2011-05-11 23:02:20 -0700 | [diff] [blame] | 85 | private final TrustedCertificateStore mTrustedCertificateStore |
| 86 | = new TrustedCertificateStore(); |
Brian Carlstrom | 3e6251d | 2011-04-11 09:05:06 -0700 | [diff] [blame] | 87 | |
Kenny Root | 6f1f03b | 2012-03-08 10:30:39 -0800 | [diff] [blame] | 88 | @Override |
| 89 | public String requestPrivateKey(String alias) { |
| 90 | checkArgs(alias); |
| 91 | |
| 92 | final String keystoreAlias = Credentials.USER_PRIVATE_KEY + alias; |
| 93 | final int uid = Binder.getCallingUid(); |
| 94 | if (!mKeyStore.grant(keystoreAlias, uid)) { |
| 95 | return null; |
| 96 | } |
| 97 | |
| 98 | final StringBuilder sb = new StringBuilder(); |
| 99 | sb.append(Process.SYSTEM_UID); |
| 100 | sb.append('_'); |
| 101 | sb.append(keystoreAlias); |
| 102 | |
| 103 | return sb.toString(); |
Brian Carlstrom | 3e6251d | 2011-04-11 09:05:06 -0700 | [diff] [blame] | 104 | } |
| 105 | |
Fred Quintana | fb2e18e | 2011-07-13 14:54:05 -0700 | [diff] [blame] | 106 | @Override public byte[] getCertificate(String alias) { |
Kenny Root | 6f1f03b | 2012-03-08 10:30:39 -0800 | [diff] [blame] | 107 | checkArgs(alias); |
| 108 | return mKeyStore.get(Credentials.USER_CERTIFICATE + alias); |
Brian Carlstrom | 3e6251d | 2011-04-11 09:05:06 -0700 | [diff] [blame] | 109 | } |
| 110 | |
Kenny Root | 6f1f03b | 2012-03-08 10:30:39 -0800 | [diff] [blame] | 111 | private void checkArgs(String alias) { |
Brian Carlstrom | 3e6251d | 2011-04-11 09:05:06 -0700 | [diff] [blame] | 112 | if (alias == null) { |
| 113 | throw new NullPointerException("alias == null"); |
| 114 | } |
Kenny Root | 4ff2296 | 2013-02-14 10:17:06 -0800 | [diff] [blame] | 115 | if (!mKeyStore.isUnlocked()) { |
Nick Kralevich | c8b0463 | 2012-05-21 15:13:07 -0700 | [diff] [blame] | 116 | throw new IllegalStateException("keystore is " |
| 117 | + mKeyStore.state().toString()); |
Brian Carlstrom | 3e6251d | 2011-04-11 09:05:06 -0700 | [diff] [blame] | 118 | } |
Nick Kralevich | c8b0463 | 2012-05-21 15:13:07 -0700 | [diff] [blame] | 119 | |
Fred Quintana | fb2e18e | 2011-07-13 14:54:05 -0700 | [diff] [blame] | 120 | final int callingUid = getCallingUid(); |
| 121 | if (!hasGrantInternal(mDatabaseHelper.getReadableDatabase(), callingUid, alias)) { |
| 122 | throw new IllegalStateException("uid " + callingUid |
| 123 | + " doesn't have permission to access the requested alias"); |
Brian Carlstrom | 3e6251d | 2011-04-11 09:05:06 -0700 | [diff] [blame] | 124 | } |
Brian Carlstrom | 3e6251d | 2011-04-11 09:05:06 -0700 | [diff] [blame] | 125 | } |
| 126 | |
Brian Carlstrom | a58db54 | 2011-05-11 23:02:20 -0700 | [diff] [blame] | 127 | @Override public void installCaCertificate(byte[] caCertificate) { |
Brian Carlstrom | 43f5b77 | 2011-06-27 02:27:16 -0700 | [diff] [blame] | 128 | checkCertInstallerOrSystemCaller(); |
Julia Reynolds | 3fb7449 | 2014-06-30 16:54:50 -0400 | [diff] [blame^] | 129 | checkUserRestriction(); |
Brian Carlstrom | a58db54 | 2011-05-11 23:02:20 -0700 | [diff] [blame] | 130 | try { |
| 131 | synchronized (mTrustedCertificateStore) { |
| 132 | mTrustedCertificateStore.installCertificate(parseCertificate(caCertificate)); |
| 133 | } |
| 134 | } catch (IOException e) { |
| 135 | throw new IllegalStateException(e); |
| 136 | } catch (CertificateException e) { |
| 137 | throw new IllegalStateException(e); |
| 138 | } |
Selim Gurun | 39e36e5 | 2012-02-14 10:50:42 -0800 | [diff] [blame] | 139 | broadcastStorageChange(); |
Brian Carlstrom | a58db54 | 2011-05-11 23:02:20 -0700 | [diff] [blame] | 140 | } |
Brian Carlstrom | 5aeadd9 | 2011-05-17 00:40:33 -0700 | [diff] [blame] | 141 | |
| 142 | private X509Certificate parseCertificate(byte[] bytes) throws CertificateException { |
| 143 | CertificateFactory cf = CertificateFactory.getInstance("X.509"); |
| 144 | return (X509Certificate) cf.generateCertificate(new ByteArrayInputStream(bytes)); |
| 145 | } |
| 146 | |
Brian Carlstrom | a58db54 | 2011-05-11 23:02:20 -0700 | [diff] [blame] | 147 | @Override public boolean reset() { |
| 148 | // only Settings should be able to reset |
Brian Carlstrom | 43f5b77 | 2011-06-27 02:27:16 -0700 | [diff] [blame] | 149 | checkSystemCaller(); |
Julia Reynolds | 3fb7449 | 2014-06-30 16:54:50 -0400 | [diff] [blame^] | 150 | checkUserRestriction(); |
Fred Quintana | fb2e18e | 2011-07-13 14:54:05 -0700 | [diff] [blame] | 151 | removeAllGrants(mDatabaseHelper.getWritableDatabase()); |
Brian Carlstrom | a58db54 | 2011-05-11 23:02:20 -0700 | [diff] [blame] | 152 | boolean ok = true; |
Brian Carlstrom | a58db54 | 2011-05-11 23:02:20 -0700 | [diff] [blame] | 153 | synchronized (mTrustedCertificateStore) { |
| 154 | // delete user-installed CA certs |
| 155 | for (String alias : mTrustedCertificateStore.aliases()) { |
| 156 | if (TrustedCertificateStore.isUser(alias)) { |
Brian Carlstrom | 43f5b77 | 2011-06-27 02:27:16 -0700 | [diff] [blame] | 157 | if (!deleteCertificateEntry(alias)) { |
Brian Carlstrom | a58db54 | 2011-05-11 23:02:20 -0700 | [diff] [blame] | 158 | ok = false; |
| 159 | } |
| 160 | } |
| 161 | } |
Brian Carlstrom | a58db54 | 2011-05-11 23:02:20 -0700 | [diff] [blame] | 162 | } |
Selim Gurun | 39e36e5 | 2012-02-14 10:50:42 -0800 | [diff] [blame] | 163 | broadcastStorageChange(); |
| 164 | return ok; |
Brian Carlstrom | a58db54 | 2011-05-11 23:02:20 -0700 | [diff] [blame] | 165 | } |
Brian Carlstrom | 43f5b77 | 2011-06-27 02:27:16 -0700 | [diff] [blame] | 166 | |
| 167 | @Override public boolean deleteCaCertificate(String alias) { |
| 168 | // only Settings should be able to delete |
| 169 | checkSystemCaller(); |
Julia Reynolds | 3fb7449 | 2014-06-30 16:54:50 -0400 | [diff] [blame^] | 170 | checkUserRestriction(); |
Selim Gurun | 39e36e5 | 2012-02-14 10:50:42 -0800 | [diff] [blame] | 171 | boolean ok = true; |
| 172 | synchronized (mTrustedCertificateStore) { |
| 173 | ok = deleteCertificateEntry(alias); |
| 174 | } |
| 175 | broadcastStorageChange(); |
| 176 | return ok; |
Brian Carlstrom | 43f5b77 | 2011-06-27 02:27:16 -0700 | [diff] [blame] | 177 | } |
| 178 | |
| 179 | private boolean deleteCertificateEntry(String alias) { |
| 180 | try { |
| 181 | mTrustedCertificateStore.deleteCertificateEntry(alias); |
| 182 | return true; |
| 183 | } catch (IOException e) { |
| 184 | Log.w(TAG, "Problem removing CA certificate " + alias, e); |
| 185 | return false; |
| 186 | } catch (CertificateException e) { |
| 187 | Log.w(TAG, "Problem removing CA certificate " + alias, e); |
| 188 | return false; |
| 189 | } |
| 190 | } |
| 191 | |
| 192 | private void checkCertInstallerOrSystemCaller() { |
| 193 | String actual = checkCaller("com.android.certinstaller"); |
| 194 | if (actual == null) { |
| 195 | return; |
| 196 | } |
| 197 | checkSystemCaller(); |
| 198 | } |
| 199 | private void checkSystemCaller() { |
| 200 | String actual = checkCaller("android.uid.system:1000"); |
| 201 | if (actual != null) { |
| 202 | throw new IllegalStateException(actual); |
| 203 | } |
| 204 | } |
Julia Reynolds | 3fb7449 | 2014-06-30 16:54:50 -0400 | [diff] [blame^] | 205 | private void checkUserRestriction() { |
| 206 | UserManager um = (UserManager) getSystemService(USER_SERVICE); |
| 207 | if (um.hasUserRestriction(UserManager.DISALLOW_CONFIG_CREDENTIALS)) { |
| 208 | throw new SecurityException("User cannot modify credentials"); |
| 209 | } |
| 210 | } |
Brian Carlstrom | 43f5b77 | 2011-06-27 02:27:16 -0700 | [diff] [blame] | 211 | /** |
| 212 | * Returns null if actually caller is expected, otherwise return bad package to report |
| 213 | */ |
| 214 | private String checkCaller(String expectedPackage) { |
| 215 | String actualPackage = getPackageManager().getNameForUid(getCallingUid()); |
| 216 | return (!expectedPackage.equals(actualPackage)) ? actualPackage : null; |
| 217 | } |
Brian Carlstrom | 3e6251d | 2011-04-11 09:05:06 -0700 | [diff] [blame] | 218 | |
Fred Quintana | fb2e18e | 2011-07-13 14:54:05 -0700 | [diff] [blame] | 219 | @Override public boolean hasGrant(int uid, String alias) { |
| 220 | checkSystemCaller(); |
| 221 | return hasGrantInternal(mDatabaseHelper.getReadableDatabase(), uid, alias); |
Brian Carlstrom | 3e6251d | 2011-04-11 09:05:06 -0700 | [diff] [blame] | 222 | } |
| 223 | |
Fred Quintana | fb2e18e | 2011-07-13 14:54:05 -0700 | [diff] [blame] | 224 | @Override public void setGrant(int uid, String alias, boolean value) { |
| 225 | checkSystemCaller(); |
| 226 | setGrantInternal(mDatabaseHelper.getWritableDatabase(), uid, alias, value); |
Selim Gurun | 39e36e5 | 2012-02-14 10:50:42 -0800 | [diff] [blame] | 227 | broadcastStorageChange(); |
Brian Carlstrom | 3e6251d | 2011-04-11 09:05:06 -0700 | [diff] [blame] | 228 | } |
| 229 | }; |
| 230 | |
Fred Quintana | fb2e18e | 2011-07-13 14:54:05 -0700 | [diff] [blame] | 231 | private boolean hasGrantInternal(final SQLiteDatabase db, final int uid, final String alias) { |
| 232 | final long numMatches = DatabaseUtils.longForQuery(db, SELECTION_COUNT_OF_MATCHING_GRANTS, |
| 233 | new String[]{String.valueOf(uid), alias}); |
| 234 | return numMatches > 0; |
| 235 | } |
Brian Carlstrom | 3e6251d | 2011-04-11 09:05:06 -0700 | [diff] [blame] | 236 | |
Fred Quintana | fb2e18e | 2011-07-13 14:54:05 -0700 | [diff] [blame] | 237 | private void setGrantInternal(final SQLiteDatabase db, |
| 238 | final int uid, final String alias, final boolean value) { |
| 239 | if (value) { |
| 240 | if (!hasGrantInternal(db, uid, alias)) { |
| 241 | final ContentValues values = new ContentValues(); |
| 242 | values.put(GRANTS_ALIAS, alias); |
| 243 | values.put(GRANTS_GRANTEE_UID, uid); |
| 244 | db.insert(TABLE_GRANTS, GRANTS_ALIAS, values); |
| 245 | } |
| 246 | } else { |
| 247 | db.delete(TABLE_GRANTS, SELECT_GRANTS_BY_UID_AND_ALIAS, |
| 248 | new String[]{String.valueOf(uid), alias}); |
| 249 | } |
| 250 | } |
| 251 | |
| 252 | private void removeAllGrants(final SQLiteDatabase db) { |
| 253 | db.delete(TABLE_GRANTS, null /* whereClause */, null /* whereArgs */); |
| 254 | } |
| 255 | |
| 256 | private class DatabaseHelper extends SQLiteOpenHelper { |
| 257 | public DatabaseHelper(Context context) { |
| 258 | super(context, DATABASE_NAME, null /* CursorFactory */, DATABASE_VERSION); |
| 259 | } |
| 260 | |
| 261 | @Override |
| 262 | public void onCreate(final SQLiteDatabase db) { |
| 263 | db.execSQL("CREATE TABLE " + TABLE_GRANTS + " ( " |
| 264 | + GRANTS_ALIAS + " STRING NOT NULL, " |
| 265 | + GRANTS_GRANTEE_UID + " INTEGER NOT NULL, " |
| 266 | + "UNIQUE (" + GRANTS_ALIAS + "," + GRANTS_GRANTEE_UID + "))"); |
| 267 | } |
| 268 | |
| 269 | @Override |
| 270 | public void onUpgrade(final SQLiteDatabase db, int oldVersion, final int newVersion) { |
| 271 | Log.e(TAG, "upgrade from version " + oldVersion + " to version " + newVersion); |
| 272 | |
| 273 | if (oldVersion == 1) { |
| 274 | // the first upgrade step goes here |
| 275 | oldVersion++; |
Brian Carlstrom | 3e6251d | 2011-04-11 09:05:06 -0700 | [diff] [blame] | 276 | } |
Brian Carlstrom | 7037b73 | 2011-06-30 15:04:49 -0700 | [diff] [blame] | 277 | } |
Fred Quintana | fb2e18e | 2011-07-13 14:54:05 -0700 | [diff] [blame] | 278 | } |
| 279 | |
| 280 | @Override public IBinder onBind(Intent intent) { |
Brian Carlstrom | 7037b73 | 2011-06-30 15:04:49 -0700 | [diff] [blame] | 281 | if (IKeyChainService.class.getName().equals(intent.getAction())) { |
Brian Carlstrom | 3e6251d | 2011-04-11 09:05:06 -0700 | [diff] [blame] | 282 | return mIKeyChainService; |
| 283 | } |
Brian Carlstrom | 3e6251d | 2011-04-11 09:05:06 -0700 | [diff] [blame] | 284 | return null; |
| 285 | } |
Fred Quintana | fb2e18e | 2011-07-13 14:54:05 -0700 | [diff] [blame] | 286 | |
| 287 | @Override |
| 288 | protected void onHandleIntent(final Intent intent) { |
| 289 | if (Intent.ACTION_PACKAGE_REMOVED.equals(intent.getAction())) { |
| 290 | purgeOldGrants(); |
| 291 | } |
| 292 | } |
| 293 | |
| 294 | private void purgeOldGrants() { |
| 295 | final PackageManager packageManager = getPackageManager(); |
| 296 | final SQLiteDatabase db = mDatabaseHelper.getWritableDatabase(); |
| 297 | Cursor cursor = null; |
| 298 | db.beginTransaction(); |
| 299 | try { |
| 300 | cursor = db.query(TABLE_GRANTS, |
| 301 | new String[]{GRANTS_GRANTEE_UID}, null, null, GRANTS_GRANTEE_UID, null, null); |
| 302 | while (cursor.moveToNext()) { |
| 303 | final int uid = cursor.getInt(0); |
| 304 | final boolean packageExists = packageManager.getPackagesForUid(uid) != null; |
| 305 | if (packageExists) { |
| 306 | continue; |
| 307 | } |
| 308 | Log.d(TAG, "deleting grants for UID " + uid |
| 309 | + " because its package is no longer installed"); |
| 310 | db.delete(TABLE_GRANTS, SELECTION_GRANTS_BY_UID, |
| 311 | new String[]{Integer.toString(uid)}); |
| 312 | } |
| 313 | db.setTransactionSuccessful(); |
| 314 | } finally { |
| 315 | if (cursor != null) { |
| 316 | cursor.close(); |
| 317 | } |
| 318 | db.endTransaction(); |
| 319 | } |
| 320 | } |
Selim Gurun | 39e36e5 | 2012-02-14 10:50:42 -0800 | [diff] [blame] | 321 | |
| 322 | private void broadcastStorageChange() { |
| 323 | Intent intent = new Intent(KeyChain.ACTION_STORAGE_CHANGED); |
| 324 | sendBroadcast(intent); |
| 325 | } |
| 326 | |
Brian Carlstrom | 3e6251d | 2011-04-11 09:05:06 -0700 | [diff] [blame] | 327 | } |