TrustManagerService.java revision 800631affd5eaae69855f2a0c1ba24d1e4f3acbc
1/* 2 * Copyright (C) 2014 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 17package com.android.server.trust; 18 19import com.android.internal.content.PackageMonitor; 20import com.android.internal.widget.LockPatternUtils; 21import com.android.server.SystemService; 22 23import org.xmlpull.v1.XmlPullParser; 24import org.xmlpull.v1.XmlPullParserException; 25 26import android.Manifest; 27import android.app.ActivityManagerNative; 28import android.app.admin.DevicePolicyManager; 29import android.app.trust.ITrustListener; 30import android.app.trust.ITrustManager; 31import android.content.BroadcastReceiver; 32import android.content.ComponentName; 33import android.content.Context; 34import android.content.Intent; 35import android.content.IntentFilter; 36import android.content.pm.PackageManager; 37import android.content.pm.ResolveInfo; 38import android.content.pm.UserInfo; 39import android.content.res.Resources; 40import android.content.res.TypedArray; 41import android.content.res.XmlResourceParser; 42import android.graphics.drawable.Drawable; 43import android.os.DeadObjectException; 44import android.os.Handler; 45import android.os.IBinder; 46import android.os.Message; 47import android.os.RemoteException; 48import android.os.UserHandle; 49import android.os.UserManager; 50import android.service.trust.TrustAgentService; 51import android.util.ArraySet; 52import android.util.AttributeSet; 53import android.util.Log; 54import android.util.Slog; 55import android.util.SparseBooleanArray; 56import android.util.Xml; 57 58import java.io.FileDescriptor; 59import java.io.IOException; 60import java.io.PrintWriter; 61import java.util.ArrayList; 62import java.util.List; 63 64/** 65 * Manages trust agents and trust listeners. 66 * 67 * It is responsible for binding to the enabled {@link android.service.trust.TrustAgentService}s 68 * of each user and notifies them about events that are relevant to them. 69 * It start and stops them based on the value of 70 * {@link com.android.internal.widget.LockPatternUtils#getEnabledTrustAgents(int)}. 71 * 72 * It also keeps a set of {@link android.app.trust.ITrustListener}s that are notified whenever the 73 * trust state changes for any user. 74 * 75 * Trust state and the setting of enabled agents is kept per user and each user has its own 76 * instance of a {@link android.service.trust.TrustAgentService}. 77 */ 78public class TrustManagerService extends SystemService { 79 80 private static final boolean DEBUG = false; 81 private static final String TAG = "TrustManagerService"; 82 83 private static final Intent TRUST_AGENT_INTENT = 84 new Intent(TrustAgentService.SERVICE_INTERFACE); 85 private static final String PERMISSION_PROVIDE_AGENT = Manifest.permission.PROVIDE_TRUST_AGENT; 86 87 private static final int MSG_REGISTER_LISTENER = 1; 88 private static final int MSG_UNREGISTER_LISTENER = 2; 89 private static final int MSG_DISPATCH_UNLOCK_ATTEMPT = 3; 90 private static final int MSG_ENABLED_AGENTS_CHANGED = 4; 91 92 private final ArraySet<AgentInfo> mActiveAgents = new ArraySet<AgentInfo>(); 93 private final ArrayList<ITrustListener> mTrustListeners = new ArrayList<ITrustListener>(); 94 private final DevicePolicyReceiver mDevicePolicyReceiver = new DevicePolicyReceiver(); 95 private final SparseBooleanArray mUserHasAuthenticatedSinceBoot = new SparseBooleanArray(); 96 /* package */ final TrustArchive mArchive = new TrustArchive(); 97 private final Context mContext; 98 99 private UserManager mUserManager; 100 101 /** 102 * Cache for {@link #refreshAgentList()} 103 */ 104 private final ArraySet<AgentInfo> mObsoleteAgents = new ArraySet<AgentInfo>(); 105 106 107 public TrustManagerService(Context context) { 108 super(context); 109 mContext = context; 110 mUserManager = (UserManager) mContext.getSystemService(Context.USER_SERVICE); 111 } 112 113 @Override 114 public void onStart() { 115 publishBinderService(Context.TRUST_SERVICE, mService); 116 } 117 118 @Override 119 public void onBootPhase(int phase) { 120 if (phase == SystemService.PHASE_SYSTEM_SERVICES_READY && !isSafeMode()) { 121 mPackageMonitor.register(mContext, mHandler.getLooper(), UserHandle.ALL, true); 122 mDevicePolicyReceiver.register(mContext); 123 refreshAgentList(); 124 } 125 } 126 127 // Agent management 128 129 private static final class AgentInfo { 130 CharSequence label; 131 Drawable icon; 132 ComponentName component; // service that implements ITrustAgent 133 ComponentName settings; // setting to launch to modify agent. 134 TrustAgentWrapper agent; 135 int userId; 136 137 @Override 138 public boolean equals(Object other) { 139 if (!(other instanceof AgentInfo)) { 140 return false; 141 } 142 AgentInfo o = (AgentInfo) other; 143 return component.equals(o.component) && userId == o.userId; 144 } 145 146 @Override 147 public int hashCode() { 148 return component.hashCode() * 31 + userId; 149 } 150 } 151 152 private void updateTrustAll() { 153 List<UserInfo> userInfos = mUserManager.getUsers(true /* excludeDying */); 154 for (UserInfo userInfo : userInfos) { 155 updateTrust(userInfo.id); 156 } 157 } 158 159 public void updateTrust(int userId) { 160 dispatchOnTrustChanged(aggregateIsTrusted(userId), userId); 161 } 162 163 protected void refreshAgentList() { 164 if (DEBUG) Slog.d(TAG, "refreshAgentList()"); 165 PackageManager pm = mContext.getPackageManager(); 166 167 List<UserInfo> userInfos = mUserManager.getUsers(true /* excludeDying */); 168 LockPatternUtils lockPatternUtils = new LockPatternUtils(mContext); 169 170 mObsoleteAgents.clear(); 171 mObsoleteAgents.addAll(mActiveAgents); 172 173 for (UserInfo userInfo : userInfos) { 174 int disabledFeatures = lockPatternUtils.getDevicePolicyManager() 175 .getKeyguardDisabledFeatures(null, userInfo.id); 176 boolean disableTrustAgents = 177 (disabledFeatures & DevicePolicyManager.KEYGUARD_DISABLE_TRUST_AGENTS) != 0; 178 179 List<ComponentName> enabledAgents = lockPatternUtils.getEnabledTrustAgents(userInfo.id); 180 if (disableTrustAgents || enabledAgents == null) { 181 continue; 182 } 183 List<ResolveInfo> resolveInfos = pm.queryIntentServicesAsUser(TRUST_AGENT_INTENT, 184 PackageManager.GET_META_DATA, userInfo.id); 185 for (ResolveInfo resolveInfo : resolveInfos) { 186 if (resolveInfo.serviceInfo == null) continue; 187 188 String packageName = resolveInfo.serviceInfo.packageName; 189 if (pm.checkPermission(PERMISSION_PROVIDE_AGENT, packageName) 190 != PackageManager.PERMISSION_GRANTED) { 191 Log.w(TAG, "Skipping agent because package " + packageName 192 + " does not have permission " + PERMISSION_PROVIDE_AGENT + "."); 193 continue; 194 } 195 196 ComponentName name = getComponentName(resolveInfo); 197 if (!enabledAgents.contains(name)) continue; 198 199 AgentInfo agentInfo = new AgentInfo(); 200 agentInfo.component = name; 201 agentInfo.userId = userInfo.id; 202 if (!mActiveAgents.contains(agentInfo)) { 203 agentInfo.label = resolveInfo.loadLabel(pm); 204 agentInfo.icon = resolveInfo.loadIcon(pm); 205 agentInfo.settings = getSettingsComponentName(pm, resolveInfo); 206 agentInfo.agent = new TrustAgentWrapper(mContext, this, 207 new Intent().setComponent(name), userInfo.getUserHandle()); 208 mActiveAgents.add(agentInfo); 209 } else { 210 mObsoleteAgents.remove(agentInfo); 211 } 212 } 213 } 214 215 boolean trustMayHaveChanged = false; 216 for (int i = 0; i < mObsoleteAgents.size(); i++) { 217 AgentInfo info = mObsoleteAgents.valueAt(i); 218 if (info.agent.isTrusted()) { 219 trustMayHaveChanged = true; 220 } 221 info.agent.unbind(); 222 mActiveAgents.remove(info); 223 } 224 225 if (trustMayHaveChanged) { 226 updateTrustAll(); 227 } 228 } 229 230 private ComponentName getSettingsComponentName(PackageManager pm, ResolveInfo resolveInfo) { 231 if (resolveInfo == null || resolveInfo.serviceInfo == null 232 || resolveInfo.serviceInfo.metaData == null) return null; 233 String cn = null; 234 XmlResourceParser parser = null; 235 Exception caughtException = null; 236 try { 237 parser = resolveInfo.serviceInfo.loadXmlMetaData(pm, 238 TrustAgentService.TRUST_AGENT_META_DATA); 239 if (parser == null) { 240 Slog.w(TAG, "Can't find " + TrustAgentService.TRUST_AGENT_META_DATA + " meta-data"); 241 return null; 242 } 243 Resources res = pm.getResourcesForApplication(resolveInfo.serviceInfo.applicationInfo); 244 AttributeSet attrs = Xml.asAttributeSet(parser); 245 int type; 246 while ((type = parser.next()) != XmlPullParser.END_DOCUMENT 247 && type != XmlPullParser.START_TAG) { 248 // Drain preamble. 249 } 250 String nodeName = parser.getName(); 251 if (!"trust-agent".equals(nodeName)) { 252 Slog.w(TAG, "Meta-data does not start with trust-agent tag"); 253 return null; 254 } 255 TypedArray sa = res 256 .obtainAttributes(attrs, com.android.internal.R.styleable.TrustAgent); 257 cn = sa.getString(com.android.internal.R.styleable.TrustAgent_settingsActivity); 258 sa.recycle(); 259 } catch (PackageManager.NameNotFoundException e) { 260 caughtException = e; 261 } catch (IOException e) { 262 caughtException = e; 263 } catch (XmlPullParserException e) { 264 caughtException = e; 265 } finally { 266 if (parser != null) parser.close(); 267 } 268 if (caughtException != null) { 269 Slog.w(TAG, "Error parsing : " + resolveInfo.serviceInfo.packageName, caughtException); 270 return null; 271 } 272 if (cn == null) { 273 return null; 274 } 275 if (cn.indexOf('/') < 0) { 276 cn = resolveInfo.serviceInfo.packageName + "/" + cn; 277 } 278 return ComponentName.unflattenFromString(cn); 279 } 280 281 private ComponentName getComponentName(ResolveInfo resolveInfo) { 282 if (resolveInfo == null || resolveInfo.serviceInfo == null) return null; 283 return new ComponentName(resolveInfo.serviceInfo.packageName, resolveInfo.serviceInfo.name); 284 } 285 286 // Agent dispatch and aggregation 287 288 private boolean aggregateIsTrusted(int userId) { 289 if (!mUserHasAuthenticatedSinceBoot.get(userId)) { 290 return false; 291 } 292 for (int i = 0; i < mActiveAgents.size(); i++) { 293 AgentInfo info = mActiveAgents.valueAt(i); 294 if (info.userId == userId) { 295 if (info.agent.isTrusted()) { 296 return true; 297 } 298 } 299 } 300 return false; 301 } 302 303 private void dispatchUnlockAttempt(boolean successful, int userId) { 304 for (int i = 0; i < mActiveAgents.size(); i++) { 305 AgentInfo info = mActiveAgents.valueAt(i); 306 if (info.userId == userId) { 307 info.agent.onUnlockAttempt(successful); 308 } 309 } 310 311 if (successful && !mUserHasAuthenticatedSinceBoot.get(userId)) { 312 mUserHasAuthenticatedSinceBoot.put(userId, true); 313 updateTrust(userId); 314 } 315 } 316 317 // Listeners 318 319 private void addListener(ITrustListener listener) { 320 for (int i = 0; i < mTrustListeners.size(); i++) { 321 if (mTrustListeners.get(i).asBinder() == listener.asBinder()) { 322 return; 323 } 324 } 325 mTrustListeners.add(listener); 326 } 327 328 private void removeListener(ITrustListener listener) { 329 for (int i = 0; i < mTrustListeners.size(); i++) { 330 if (mTrustListeners.get(i).asBinder() == listener.asBinder()) { 331 mTrustListeners.get(i); 332 return; 333 } 334 } 335 } 336 337 private void dispatchOnTrustChanged(boolean enabled, int userId) { 338 for (int i = 0; i < mTrustListeners.size(); i++) { 339 try { 340 mTrustListeners.get(i).onTrustChanged(enabled, userId); 341 } catch (DeadObjectException e) { 342 if (DEBUG) Slog.d(TAG, "Removing dead TrustListener."); 343 mTrustListeners.remove(i); 344 i--; 345 } catch (RemoteException e) { 346 Slog.e(TAG, "Exception while notifying TrustListener.", e); 347 } 348 } 349 } 350 351 // Plumbing 352 353 private final IBinder mService = new ITrustManager.Stub() { 354 @Override 355 public void reportUnlockAttempt(boolean authenticated, int userId) throws RemoteException { 356 enforceReportPermission(); 357 mHandler.obtainMessage(MSG_DISPATCH_UNLOCK_ATTEMPT, authenticated ? 1 : 0, userId) 358 .sendToTarget(); 359 } 360 361 @Override 362 public void reportEnabledTrustAgentsChanged(int userId) throws RemoteException { 363 enforceReportPermission(); 364 // coalesce refresh messages. 365 mHandler.removeMessages(MSG_ENABLED_AGENTS_CHANGED); 366 mHandler.sendEmptyMessage(MSG_ENABLED_AGENTS_CHANGED); 367 } 368 369 @Override 370 public void registerTrustListener(ITrustListener trustListener) throws RemoteException { 371 enforceListenerPermission(); 372 mHandler.obtainMessage(MSG_REGISTER_LISTENER, trustListener).sendToTarget(); 373 } 374 375 @Override 376 public void unregisterTrustListener(ITrustListener trustListener) throws RemoteException { 377 enforceListenerPermission(); 378 mHandler.obtainMessage(MSG_UNREGISTER_LISTENER, trustListener).sendToTarget(); 379 } 380 381 private void enforceReportPermission() { 382 mContext.enforceCallingPermission(Manifest.permission.ACCESS_KEYGUARD_SECURE_STORAGE, 383 "reporting trust events"); 384 } 385 386 private void enforceListenerPermission() { 387 mContext.enforceCallingPermission(Manifest.permission.TRUST_LISTENER, 388 "register trust listener"); 389 } 390 391 @Override 392 protected void dump(FileDescriptor fd, final PrintWriter fout, String[] args) { 393 mContext.enforceCallingPermission(Manifest.permission.DUMP, 394 "dumping TrustManagerService"); 395 final UserInfo currentUser; 396 final List<UserInfo> userInfos = mUserManager.getUsers(true /* excludeDying */); 397 try { 398 currentUser = ActivityManagerNative.getDefault().getCurrentUser(); 399 } catch (RemoteException e) { 400 throw new RuntimeException(e); 401 } 402 mHandler.runWithScissors(new Runnable() { 403 @Override 404 public void run() { 405 fout.println("Trust manager state:"); 406 for (UserInfo user : userInfos) { 407 dumpUser(fout, user, user.id == currentUser.id); 408 } 409 } 410 }, 1500); 411 } 412 413 private void dumpUser(PrintWriter fout, UserInfo user, boolean isCurrent) { 414 fout.printf(" User \"%s\" (id=%d, flags=%#x)", 415 user.name, user.id, user.flags); 416 if (isCurrent) { 417 fout.print(" (current)"); 418 } 419 fout.print(": trusted=" + dumpBool(aggregateIsTrusted(user.id))); 420 fout.println(); 421 fout.println(" Enabled agents:"); 422 boolean duplicateSimpleNames = false; 423 ArraySet<String> simpleNames = new ArraySet<String>(); 424 for (AgentInfo info : mActiveAgents) { 425 if (info.userId != user.id) { continue; } 426 boolean trusted = info.agent.isTrusted(); 427 fout.print(" "); fout.println(info.component.flattenToShortString()); 428 fout.print(" connected=" + dumpBool(info.agent.isConnected())); 429 fout.println(", trusted=" + dumpBool(trusted)); 430 if (trusted) { 431 fout.println(" message=\"" + info.agent.getMessage() + "\""); 432 } 433 if (!simpleNames.add(TrustArchive.getSimpleName(info.component))) { 434 duplicateSimpleNames = true; 435 } 436 } 437 fout.println(" Events:"); 438 mArchive.dump(fout, 50, user.id, " " /* linePrefix */, duplicateSimpleNames); 439 fout.println(); 440 } 441 442 private String dumpBool(boolean b) { 443 return b ? "1" : "0"; 444 } 445 }; 446 447 private final Handler mHandler = new Handler() { 448 @Override 449 public void handleMessage(Message msg) { 450 switch (msg.what) { 451 case MSG_REGISTER_LISTENER: 452 addListener((ITrustListener) msg.obj); 453 break; 454 case MSG_UNREGISTER_LISTENER: 455 removeListener((ITrustListener) msg.obj); 456 break; 457 case MSG_DISPATCH_UNLOCK_ATTEMPT: 458 dispatchUnlockAttempt(msg.arg1 != 0, msg.arg2); 459 break; 460 case MSG_ENABLED_AGENTS_CHANGED: 461 refreshAgentList(); 462 break; 463 } 464 } 465 }; 466 467 private final PackageMonitor mPackageMonitor = new PackageMonitor() { 468 @Override 469 public void onSomePackagesChanged() { 470 refreshAgentList(); 471 } 472 473 @Override 474 public boolean onPackageChanged(String packageName, int uid, String[] components) { 475 // We're interested in all changes, even if just some components get enabled / disabled. 476 return true; 477 } 478 }; 479 480 private class DevicePolicyReceiver extends BroadcastReceiver { 481 482 @Override 483 public void onReceive(Context context, Intent intent) { 484 if (DevicePolicyManager.ACTION_DEVICE_POLICY_MANAGER_STATE_CHANGED.equals( 485 intent.getAction())) { 486 refreshAgentList(); 487 } 488 } 489 490 public void register(Context context) { 491 context.registerReceiverAsUser(this, 492 UserHandle.ALL, 493 new IntentFilter( 494 DevicePolicyManager.ACTION_DEVICE_POLICY_MANAGER_STATE_CHANGED), 495 null /* permission */, 496 null /* scheduler */); 497 } 498 } 499} 500