TrustManagerService.java revision 8f21158fe64eb93ff005dc1b831b282b95531023
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.SystemClock; 49import android.os.UserHandle; 50import android.os.UserManager; 51import android.service.trust.TrustAgentService; 52import android.util.ArraySet; 53import android.util.AttributeSet; 54import android.util.Log; 55import android.util.Slog; 56import android.util.SparseBooleanArray; 57import android.util.Xml; 58 59import java.io.FileDescriptor; 60import java.io.IOException; 61import java.io.PrintWriter; 62import java.util.ArrayList; 63import java.util.List; 64 65/** 66 * Manages trust agents and trust listeners. 67 * 68 * It is responsible for binding to the enabled {@link android.service.trust.TrustAgentService}s 69 * of each user and notifies them about events that are relevant to them. 70 * It start and stops them based on the value of 71 * {@link com.android.internal.widget.LockPatternUtils#getEnabledTrustAgents(int)}. 72 * 73 * It also keeps a set of {@link android.app.trust.ITrustListener}s that are notified whenever the 74 * trust state changes for any user. 75 * 76 * Trust state and the setting of enabled agents is kept per user and each user has its own 77 * instance of a {@link android.service.trust.TrustAgentService}. 78 */ 79public class TrustManagerService extends SystemService { 80 81 private static final boolean DEBUG = false; 82 private static final String TAG = "TrustManagerService"; 83 84 private static final Intent TRUST_AGENT_INTENT = 85 new Intent(TrustAgentService.SERVICE_INTERFACE); 86 private static final String PERMISSION_PROVIDE_AGENT = Manifest.permission.PROVIDE_TRUST_AGENT; 87 88 private static final int MSG_REGISTER_LISTENER = 1; 89 private static final int MSG_UNREGISTER_LISTENER = 2; 90 private static final int MSG_DISPATCH_UNLOCK_ATTEMPT = 3; 91 private static final int MSG_ENABLED_AGENTS_CHANGED = 4; 92 private static final int MSG_REQUIRE_CREDENTIAL_ENTRY = 5; 93 94 private final ArraySet<AgentInfo> mActiveAgents = new ArraySet<AgentInfo>(); 95 private final ArrayList<ITrustListener> mTrustListeners = new ArrayList<ITrustListener>(); 96 private final DevicePolicyReceiver mDevicePolicyReceiver = new DevicePolicyReceiver(); 97 private final SparseBooleanArray mUserHasAuthenticatedSinceBoot = new SparseBooleanArray(); 98 /* package */ final TrustArchive mArchive = new TrustArchive(); 99 private final Context mContext; 100 101 private UserManager mUserManager; 102 103 public TrustManagerService(Context context) { 104 super(context); 105 mContext = context; 106 mUserManager = (UserManager) mContext.getSystemService(Context.USER_SERVICE); 107 } 108 109 @Override 110 public void onStart() { 111 publishBinderService(Context.TRUST_SERVICE, mService); 112 } 113 114 @Override 115 public void onBootPhase(int phase) { 116 if (phase == SystemService.PHASE_SYSTEM_SERVICES_READY && !isSafeMode()) { 117 mPackageMonitor.register(mContext, mHandler.getLooper(), UserHandle.ALL, true); 118 mDevicePolicyReceiver.register(mContext); 119 refreshAgentList(); 120 } 121 } 122 123 // Agent management 124 125 private static final class AgentInfo { 126 CharSequence label; 127 Drawable icon; 128 ComponentName component; // service that implements ITrustAgent 129 ComponentName settings; // setting to launch to modify agent. 130 TrustAgentWrapper agent; 131 int userId; 132 133 @Override 134 public boolean equals(Object other) { 135 if (!(other instanceof AgentInfo)) { 136 return false; 137 } 138 AgentInfo o = (AgentInfo) other; 139 return component.equals(o.component) && userId == o.userId; 140 } 141 142 @Override 143 public int hashCode() { 144 return component.hashCode() * 31 + userId; 145 } 146 } 147 148 private void updateTrustAll() { 149 List<UserInfo> userInfos = mUserManager.getUsers(true /* excludeDying */); 150 for (UserInfo userInfo : userInfos) { 151 updateTrust(userInfo.id); 152 } 153 } 154 155 public void updateTrust(int userId) { 156 dispatchOnTrustManagedChanged(aggregateIsTrustManaged(userId), userId); 157 dispatchOnTrustChanged(aggregateIsTrusted(userId), userId); 158 } 159 160 void refreshAgentList() { 161 if (DEBUG) Slog.d(TAG, "refreshAgentList()"); 162 PackageManager pm = mContext.getPackageManager(); 163 164 List<UserInfo> userInfos = mUserManager.getUsers(true /* excludeDying */); 165 LockPatternUtils lockPatternUtils = new LockPatternUtils(mContext); 166 167 ArraySet<AgentInfo> obsoleteAgents = new ArraySet<>(); 168 obsoleteAgents.addAll(mActiveAgents); 169 170 for (UserInfo userInfo : userInfos) { 171 DevicePolicyManager dpm = lockPatternUtils.getDevicePolicyManager(); 172 int disabledFeatures = dpm.getKeyguardDisabledFeatures(null, userInfo.id); 173 final boolean disableTrustAgents = 174 (disabledFeatures & DevicePolicyManager.KEYGUARD_DISABLE_TRUST_AGENTS) != 0; 175 176 List<ComponentName> enabledAgents = lockPatternUtils.getEnabledTrustAgents(userInfo.id); 177 if (enabledAgents == null) { 178 continue; 179 } 180 List<ResolveInfo> resolveInfos = pm.queryIntentServicesAsUser(TRUST_AGENT_INTENT, 181 PackageManager.GET_META_DATA, userInfo.id); 182 for (ResolveInfo resolveInfo : resolveInfos) { 183 if (resolveInfo.serviceInfo == null) continue; 184 185 String packageName = resolveInfo.serviceInfo.packageName; 186 if (pm.checkPermission(PERMISSION_PROVIDE_AGENT, packageName) 187 != PackageManager.PERMISSION_GRANTED) { 188 Log.w(TAG, "Skipping agent because package " + packageName 189 + " does not have permission " + PERMISSION_PROVIDE_AGENT + "."); 190 continue; 191 } 192 193 ComponentName name = getComponentName(resolveInfo); 194 if (!enabledAgents.contains(name)) continue; 195 196 if (disableTrustAgents) { 197 List<String> features = 198 dpm.getTrustAgentFeaturesEnabled(null /* admin */, name); 199 // Disable agent if no features are enabled. 200 if (features == null || features.isEmpty()) continue; 201 } 202 203 AgentInfo agentInfo = new AgentInfo(); 204 agentInfo.component = name; 205 agentInfo.userId = userInfo.id; 206 if (!mActiveAgents.contains(agentInfo)) { 207 agentInfo.label = resolveInfo.loadLabel(pm); 208 agentInfo.icon = resolveInfo.loadIcon(pm); 209 agentInfo.settings = getSettingsComponentName(pm, resolveInfo); 210 agentInfo.agent = new TrustAgentWrapper(mContext, this, 211 new Intent().setComponent(name), userInfo.getUserHandle()); 212 mActiveAgents.add(agentInfo); 213 } else { 214 obsoleteAgents.remove(agentInfo); 215 } 216 } 217 } 218 219 boolean trustMayHaveChanged = false; 220 for (int i = 0; i < obsoleteAgents.size(); i++) { 221 AgentInfo info = obsoleteAgents.valueAt(i); 222 if (info.agent.isManagingTrust()) { 223 trustMayHaveChanged = true; 224 } 225 info.agent.unbind(); 226 mActiveAgents.remove(info); 227 } 228 229 if (trustMayHaveChanged) { 230 updateTrustAll(); 231 } 232 } 233 234 void updateDevicePolicyFeatures(int userId) { 235 for (int i = 0; i < mActiveAgents.size(); i++) { 236 AgentInfo info = mActiveAgents.valueAt(i); 237 if (info.agent.isConnected()) { 238 info.agent.updateDevicePolicyFeatures(); 239 } 240 } 241 } 242 243 private void removeAgentsOfPackage(String packageName) { 244 boolean trustMayHaveChanged = false; 245 for (int i = mActiveAgents.size() - 1; i >= 0; i--) { 246 AgentInfo info = mActiveAgents.valueAt(i); 247 if (packageName.equals(info.component.getPackageName())) { 248 Log.i(TAG, "Resetting agent " + info.component.flattenToShortString()); 249 if (info.agent.isManagingTrust()) { 250 trustMayHaveChanged = true; 251 } 252 info.agent.unbind(); 253 mActiveAgents.removeAt(i); 254 } 255 } 256 if (trustMayHaveChanged) { 257 updateTrustAll(); 258 } 259 } 260 261 public void resetAgent(ComponentName name, int userId) { 262 boolean trustMayHaveChanged = false; 263 for (int i = mActiveAgents.size() - 1; i >= 0; i--) { 264 AgentInfo info = mActiveAgents.valueAt(i); 265 if (name.equals(info.component) && userId == info.userId) { 266 Log.i(TAG, "Resetting agent " + info.component.flattenToShortString()); 267 if (info.agent.isManagingTrust()) { 268 trustMayHaveChanged = true; 269 } 270 info.agent.unbind(); 271 mActiveAgents.removeAt(i); 272 } 273 } 274 if (trustMayHaveChanged) { 275 updateTrust(userId); 276 } 277 refreshAgentList(); 278 } 279 280 private ComponentName getSettingsComponentName(PackageManager pm, ResolveInfo resolveInfo) { 281 if (resolveInfo == null || resolveInfo.serviceInfo == null 282 || resolveInfo.serviceInfo.metaData == null) return null; 283 String cn = null; 284 XmlResourceParser parser = null; 285 Exception caughtException = null; 286 try { 287 parser = resolveInfo.serviceInfo.loadXmlMetaData(pm, 288 TrustAgentService.TRUST_AGENT_META_DATA); 289 if (parser == null) { 290 Slog.w(TAG, "Can't find " + TrustAgentService.TRUST_AGENT_META_DATA + " meta-data"); 291 return null; 292 } 293 Resources res = pm.getResourcesForApplication(resolveInfo.serviceInfo.applicationInfo); 294 AttributeSet attrs = Xml.asAttributeSet(parser); 295 int type; 296 while ((type = parser.next()) != XmlPullParser.END_DOCUMENT 297 && type != XmlPullParser.START_TAG) { 298 // Drain preamble. 299 } 300 String nodeName = parser.getName(); 301 if (!"trust-agent".equals(nodeName)) { 302 Slog.w(TAG, "Meta-data does not start with trust-agent tag"); 303 return null; 304 } 305 TypedArray sa = res 306 .obtainAttributes(attrs, com.android.internal.R.styleable.TrustAgent); 307 cn = sa.getString(com.android.internal.R.styleable.TrustAgent_settingsActivity); 308 sa.recycle(); 309 } catch (PackageManager.NameNotFoundException e) { 310 caughtException = e; 311 } catch (IOException e) { 312 caughtException = e; 313 } catch (XmlPullParserException e) { 314 caughtException = e; 315 } finally { 316 if (parser != null) parser.close(); 317 } 318 if (caughtException != null) { 319 Slog.w(TAG, "Error parsing : " + resolveInfo.serviceInfo.packageName, caughtException); 320 return null; 321 } 322 if (cn == null) { 323 return null; 324 } 325 if (cn.indexOf('/') < 0) { 326 cn = resolveInfo.serviceInfo.packageName + "/" + cn; 327 } 328 return ComponentName.unflattenFromString(cn); 329 } 330 331 private ComponentName getComponentName(ResolveInfo resolveInfo) { 332 if (resolveInfo == null || resolveInfo.serviceInfo == null) return null; 333 return new ComponentName(resolveInfo.serviceInfo.packageName, resolveInfo.serviceInfo.name); 334 } 335 336 // Agent dispatch and aggregation 337 338 private boolean aggregateIsTrusted(int userId) { 339 if (!mUserHasAuthenticatedSinceBoot.get(userId)) { 340 return false; 341 } 342 for (int i = 0; i < mActiveAgents.size(); i++) { 343 AgentInfo info = mActiveAgents.valueAt(i); 344 if (info.userId == userId) { 345 if (info.agent.isTrusted()) { 346 return true; 347 } 348 } 349 } 350 return false; 351 } 352 353 private boolean aggregateIsTrustManaged(int userId) { 354 if (!mUserHasAuthenticatedSinceBoot.get(userId)) { 355 return false; 356 } 357 for (int i = 0; i < mActiveAgents.size(); i++) { 358 AgentInfo info = mActiveAgents.valueAt(i); 359 if (info.userId == userId) { 360 if (info.agent.isManagingTrust()) { 361 return true; 362 } 363 } 364 } 365 return false; 366 } 367 368 private void dispatchUnlockAttempt(boolean successful, int userId) { 369 for (int i = 0; i < mActiveAgents.size(); i++) { 370 AgentInfo info = mActiveAgents.valueAt(i); 371 if (info.userId == userId) { 372 info.agent.onUnlockAttempt(successful); 373 } 374 } 375 376 if (successful && !mUserHasAuthenticatedSinceBoot.get(userId)) { 377 mUserHasAuthenticatedSinceBoot.put(userId, true); 378 updateTrust(userId); 379 } 380 } 381 382 383 private void requireCredentialEntry(int userId) { 384 if (userId == UserHandle.USER_ALL) { 385 mUserHasAuthenticatedSinceBoot.clear(); 386 updateTrustAll(); 387 } else { 388 mUserHasAuthenticatedSinceBoot.put(userId, false); 389 updateTrust(userId); 390 } 391 } 392 393 // Listeners 394 395 private void addListener(ITrustListener listener) { 396 for (int i = 0; i < mTrustListeners.size(); i++) { 397 if (mTrustListeners.get(i).asBinder() == listener.asBinder()) { 398 return; 399 } 400 } 401 mTrustListeners.add(listener); 402 } 403 404 private void removeListener(ITrustListener listener) { 405 for (int i = 0; i < mTrustListeners.size(); i++) { 406 if (mTrustListeners.get(i).asBinder() == listener.asBinder()) { 407 mTrustListeners.remove(i); 408 return; 409 } 410 } 411 } 412 413 private void dispatchOnTrustChanged(boolean enabled, int userId) { 414 for (int i = 0; i < mTrustListeners.size(); i++) { 415 try { 416 mTrustListeners.get(i).onTrustChanged(enabled, userId); 417 } catch (DeadObjectException e) { 418 Slog.d(TAG, "Removing dead TrustListener."); 419 mTrustListeners.remove(i); 420 i--; 421 } catch (RemoteException e) { 422 Slog.e(TAG, "Exception while notifying TrustListener.", e); 423 } 424 } 425 } 426 427 private void dispatchOnTrustManagedChanged(boolean managed, int userId) { 428 for (int i = 0; i < mTrustListeners.size(); i++) { 429 try { 430 mTrustListeners.get(i).onTrustManagedChanged(managed, userId); 431 } catch (DeadObjectException e) { 432 Slog.d(TAG, "Removing dead TrustListener."); 433 mTrustListeners.remove(i); 434 i--; 435 } catch (RemoteException e) { 436 Slog.e(TAG, "Exception while notifying TrustListener.", e); 437 } 438 } 439 } 440 441 // Plumbing 442 443 private final IBinder mService = new ITrustManager.Stub() { 444 @Override 445 public void reportUnlockAttempt(boolean authenticated, int userId) throws RemoteException { 446 enforceReportPermission(); 447 mHandler.obtainMessage(MSG_DISPATCH_UNLOCK_ATTEMPT, authenticated ? 1 : 0, userId) 448 .sendToTarget(); 449 } 450 451 @Override 452 public void reportEnabledTrustAgentsChanged(int userId) throws RemoteException { 453 enforceReportPermission(); 454 // coalesce refresh messages. 455 mHandler.removeMessages(MSG_ENABLED_AGENTS_CHANGED); 456 mHandler.sendEmptyMessage(MSG_ENABLED_AGENTS_CHANGED); 457 } 458 459 @Override 460 public void reportRequireCredentialEntry(int userId) throws RemoteException { 461 enforceReportPermission(); 462 if (userId == UserHandle.USER_ALL || userId >= UserHandle.USER_OWNER) { 463 mHandler.obtainMessage(MSG_REQUIRE_CREDENTIAL_ENTRY, userId, 0).sendToTarget(); 464 } else { 465 throw new IllegalArgumentException( 466 "userId must be an explicit user id or USER_ALL"); 467 } 468 } 469 470 @Override 471 public void registerTrustListener(ITrustListener trustListener) throws RemoteException { 472 enforceListenerPermission(); 473 mHandler.obtainMessage(MSG_REGISTER_LISTENER, trustListener).sendToTarget(); 474 } 475 476 @Override 477 public void unregisterTrustListener(ITrustListener trustListener) throws RemoteException { 478 enforceListenerPermission(); 479 mHandler.obtainMessage(MSG_UNREGISTER_LISTENER, trustListener).sendToTarget(); 480 } 481 482 private void enforceReportPermission() { 483 mContext.enforceCallingOrSelfPermission( 484 Manifest.permission.ACCESS_KEYGUARD_SECURE_STORAGE, "reporting trust events"); 485 } 486 487 private void enforceListenerPermission() { 488 mContext.enforceCallingPermission(Manifest.permission.TRUST_LISTENER, 489 "register trust listener"); 490 } 491 492 @Override 493 protected void dump(FileDescriptor fd, final PrintWriter fout, String[] args) { 494 mContext.enforceCallingPermission(Manifest.permission.DUMP, 495 "dumping TrustManagerService"); 496 final UserInfo currentUser; 497 final List<UserInfo> userInfos = mUserManager.getUsers(true /* excludeDying */); 498 try { 499 currentUser = ActivityManagerNative.getDefault().getCurrentUser(); 500 } catch (RemoteException e) { 501 throw new RuntimeException(e); 502 } 503 mHandler.runWithScissors(new Runnable() { 504 @Override 505 public void run() { 506 fout.println("Trust manager state:"); 507 for (UserInfo user : userInfos) { 508 dumpUser(fout, user, user.id == currentUser.id); 509 } 510 } 511 }, 1500); 512 } 513 514 private void dumpUser(PrintWriter fout, UserInfo user, boolean isCurrent) { 515 fout.printf(" User \"%s\" (id=%d, flags=%#x)", 516 user.name, user.id, user.flags); 517 if (isCurrent) { 518 fout.print(" (current)"); 519 } 520 fout.print(": trusted=" + dumpBool(aggregateIsTrusted(user.id))); 521 fout.print(", trustManaged=" + dumpBool(aggregateIsTrustManaged(user.id))); 522 fout.println(); 523 fout.println(" Enabled agents:"); 524 boolean duplicateSimpleNames = false; 525 ArraySet<String> simpleNames = new ArraySet<String>(); 526 for (AgentInfo info : mActiveAgents) { 527 if (info.userId != user.id) { continue; } 528 boolean trusted = info.agent.isTrusted(); 529 fout.print(" "); fout.println(info.component.flattenToShortString()); 530 fout.print(" bound=" + dumpBool(info.agent.isBound())); 531 fout.print(", connected=" + dumpBool(info.agent.isConnected())); 532 fout.print(", managingTrust=" + dumpBool(info.agent.isManagingTrust())); 533 fout.print(", trusted=" + dumpBool(trusted)); 534 fout.println(); 535 if (trusted) { 536 fout.println(" message=\"" + info.agent.getMessage() + "\""); 537 } 538 if (!info.agent.isConnected()) { 539 String restartTime = TrustArchive.formatDuration( 540 info.agent.getScheduledRestartUptimeMillis() 541 - SystemClock.uptimeMillis()); 542 fout.println(" restartScheduledAt=" + restartTime); 543 } 544 if (!simpleNames.add(TrustArchive.getSimpleName(info.component))) { 545 duplicateSimpleNames = true; 546 } 547 } 548 fout.println(" Events:"); 549 mArchive.dump(fout, 50, user.id, " " /* linePrefix */, duplicateSimpleNames); 550 fout.println(); 551 } 552 553 private String dumpBool(boolean b) { 554 return b ? "1" : "0"; 555 } 556 }; 557 558 private final Handler mHandler = new Handler() { 559 @Override 560 public void handleMessage(Message msg) { 561 switch (msg.what) { 562 case MSG_REGISTER_LISTENER: 563 addListener((ITrustListener) msg.obj); 564 break; 565 case MSG_UNREGISTER_LISTENER: 566 removeListener((ITrustListener) msg.obj); 567 break; 568 case MSG_DISPATCH_UNLOCK_ATTEMPT: 569 dispatchUnlockAttempt(msg.arg1 != 0, msg.arg2); 570 break; 571 case MSG_ENABLED_AGENTS_CHANGED: 572 refreshAgentList(); 573 break; 574 case MSG_REQUIRE_CREDENTIAL_ENTRY: 575 requireCredentialEntry(msg.arg1); 576 break; 577 } 578 } 579 }; 580 581 private final PackageMonitor mPackageMonitor = new PackageMonitor() { 582 @Override 583 public void onSomePackagesChanged() { 584 refreshAgentList(); 585 } 586 587 @Override 588 public boolean onPackageChanged(String packageName, int uid, String[] components) { 589 // We're interested in all changes, even if just some components get enabled / disabled. 590 return true; 591 } 592 593 @Override 594 public void onPackageDisappeared(String packageName, int reason) { 595 removeAgentsOfPackage(packageName); 596 } 597 }; 598 599 private class DevicePolicyReceiver extends BroadcastReceiver { 600 601 @Override 602 public void onReceive(Context context, Intent intent) { 603 if (DevicePolicyManager.ACTION_DEVICE_POLICY_MANAGER_STATE_CHANGED.equals( 604 intent.getAction())) { 605 refreshAgentList(); 606 updateDevicePolicyFeatures(getSendingUserId()); 607 } 608 } 609 610 public void register(Context context) { 611 context.registerReceiverAsUser(this, 612 UserHandle.ALL, 613 new IntentFilter( 614 DevicePolicyManager.ACTION_DEVICE_POLICY_MANAGER_STATE_CHANGED), 615 null /* permission */, 616 null /* scheduler */); 617 } 618 } 619} 620