PackageInstallerSession.java revision 57dcf5b177b56195421535938544f32d8b591b42
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.pm; 18 19import static android.content.pm.PackageManager.INSTALL_FAILED_ALREADY_EXISTS; 20import static android.content.pm.PackageManager.INSTALL_FAILED_INTERNAL_ERROR; 21import static android.content.pm.PackageManager.INSTALL_FAILED_INVALID_APK; 22import static android.content.pm.PackageManager.INSTALL_FAILED_PACKAGE_CHANGED; 23import static android.content.pm.PackageManager.INSTALL_SUCCEEDED; 24 25import android.content.pm.ApplicationInfo; 26import android.content.pm.IPackageInstallObserver2; 27import android.content.pm.IPackageInstallerSession; 28import android.content.pm.PackageInstallerParams; 29import android.content.pm.PackageManager; 30import android.content.pm.PackageParser; 31import android.content.pm.PackageParser.ApkLite; 32import android.content.pm.PackageParser.PackageParserException; 33import android.content.pm.Signature; 34import android.os.Build; 35import android.os.Bundle; 36import android.os.FileBridge; 37import android.os.FileUtils; 38import android.os.Handler; 39import android.os.Looper; 40import android.os.Message; 41import android.os.ParcelFileDescriptor; 42import android.os.RemoteException; 43import android.os.SELinux; 44import android.os.UserHandle; 45import android.system.ErrnoException; 46import android.system.OsConstants; 47import android.system.StructStat; 48import android.util.ArraySet; 49import android.util.Slog; 50 51import com.android.internal.content.NativeLibraryHelper; 52import com.android.internal.util.ArrayUtils; 53import com.android.internal.util.Preconditions; 54 55import libcore.io.IoUtils; 56import libcore.io.Libcore; 57 58import java.io.File; 59import java.io.FileDescriptor; 60import java.io.IOException; 61import java.util.ArrayList; 62 63public class PackageInstallerSession extends IPackageInstallerSession.Stub { 64 private static final String TAG = "PackageInstaller"; 65 66 private final PackageInstallerService.Callback mCallback; 67 private final PackageManagerService mPm; 68 private final Handler mHandler; 69 70 public final int sessionId; 71 public final int userId; 72 public final String installerPackageName; 73 /** UID not persisted */ 74 public final int installerUid; 75 public final PackageInstallerParams params; 76 public final long createdMillis; 77 public final File sessionDir; 78 79 private static final int MSG_INSTALL = 0; 80 81 private Handler.Callback mHandlerCallback = new Handler.Callback() { 82 @Override 83 public boolean handleMessage(Message msg) { 84 synchronized (mLock) { 85 if (msg.obj != null) { 86 mRemoteObserver = (IPackageInstallObserver2) msg.obj; 87 } 88 89 try { 90 installLocked(); 91 } catch (InstallFailedException e) { 92 Slog.e(TAG, "Install failed: " + e); 93 try { 94 mRemoteObserver.packageInstalled(mPackageName, null, e.error); 95 } catch (RemoteException ignored) { 96 } 97 } 98 99 return true; 100 } 101 } 102 }; 103 104 private final Object mLock = new Object(); 105 106 private int mProgress; 107 108 private String mPackageName; 109 private int mVersionCode; 110 private Signature[] mSignatures; 111 112 private boolean mMutationsAllowed; 113 private boolean mVerifierConfirmed; 114 private boolean mPermissionsConfirmed; 115 private boolean mInvalid; 116 117 private ArrayList<FileBridge> mBridges = new ArrayList<>(); 118 119 private IPackageInstallObserver2 mRemoteObserver; 120 121 public PackageInstallerSession(PackageInstallerService.Callback callback, 122 PackageManagerService pm, int sessionId, int userId, String installerPackageName, 123 int installerUid, PackageInstallerParams params, long createdMillis, File sessionDir, 124 Looper looper) { 125 mCallback = callback; 126 mPm = pm; 127 mHandler = new Handler(looper, mHandlerCallback); 128 129 this.sessionId = sessionId; 130 this.userId = userId; 131 this.installerPackageName = installerPackageName; 132 this.installerUid = installerUid; 133 this.params = params; 134 this.createdMillis = createdMillis; 135 this.sessionDir = sessionDir; 136 137 // Check against any explicitly provided signatures 138 mSignatures = params.signatures; 139 140 // TODO: splice in flag when restoring persisted session 141 mMutationsAllowed = true; 142 143 if (pm.checkPermission(android.Manifest.permission.INSTALL_PACKAGES, installerPackageName) 144 == PackageManager.PERMISSION_GRANTED) { 145 mPermissionsConfirmed = true; 146 } 147 } 148 149 @Override 150 public void updateProgress(int progress) { 151 mProgress = progress; 152 mCallback.onProgressChanged(this); 153 } 154 155 @Override 156 public ParcelFileDescriptor openWrite(String name, long offsetBytes, long lengthBytes) { 157 // TODO: relay over to DCS when installing to ASEC 158 159 // Quick sanity check of state, and allocate a pipe for ourselves. We 160 // then do heavy disk allocation outside the lock, but this open pipe 161 // will block any attempted install transitions. 162 final FileBridge bridge; 163 synchronized (mLock) { 164 if (!mMutationsAllowed) { 165 throw new IllegalStateException("Mutations not allowed"); 166 } 167 168 bridge = new FileBridge(); 169 mBridges.add(bridge); 170 } 171 172 try { 173 // Use installer provided name for now; we always rename later 174 if (!FileUtils.isValidExtFilename(name)) { 175 throw new IllegalArgumentException("Invalid name: " + name); 176 } 177 final File target = new File(sessionDir, name); 178 179 final FileDescriptor targetFd = Libcore.os.open(target.getAbsolutePath(), 180 OsConstants.O_CREAT | OsConstants.O_WRONLY, 00700); 181 182 // If caller specified a total length, allocate it for them. Free up 183 // cache space to grow, if needed. 184 if (lengthBytes > 0) { 185 final StructStat stat = Libcore.os.fstat(targetFd); 186 final long deltaBytes = lengthBytes - stat.st_size; 187 if (deltaBytes > 0) { 188 mPm.freeStorage(deltaBytes); 189 } 190 Libcore.os.posix_fallocate(targetFd, 0, lengthBytes); 191 } 192 193 if (offsetBytes > 0) { 194 Libcore.os.lseek(targetFd, offsetBytes, OsConstants.SEEK_SET); 195 } 196 197 bridge.setTargetFile(targetFd); 198 bridge.start(); 199 return new ParcelFileDescriptor(bridge.getClientSocket()); 200 201 } catch (ErrnoException e) { 202 throw new IllegalStateException("Failed to write", e); 203 } catch (IOException e) { 204 throw new IllegalStateException("Failed to write", e); 205 } 206 } 207 208 @Override 209 public void install(IPackageInstallObserver2 observer) { 210 Preconditions.checkNotNull(observer); 211 mHandler.obtainMessage(MSG_INSTALL, observer).sendToTarget(); 212 } 213 214 private void installLocked() throws InstallFailedException { 215 if (mInvalid) { 216 throw new InstallFailedException(INSTALL_FAILED_ALREADY_EXISTS, "Invalid session"); 217 } 218 219 // Verify that all writers are hands-off 220 if (mMutationsAllowed) { 221 for (FileBridge bridge : mBridges) { 222 if (!bridge.isClosed()) { 223 throw new InstallFailedException(INSTALL_FAILED_PACKAGE_CHANGED, 224 "Files still open"); 225 } 226 } 227 mMutationsAllowed = false; 228 229 // TODO: persist disabled mutations before going forward, since 230 // beyond this point we may have hardlinks to the valid install 231 } 232 233 // Verify that stage looks sane with respect to existing application. 234 // This currently only ensures packageName, versionCode, and certificate 235 // consistency. 236 validateInstallLocked(); 237 238 Preconditions.checkNotNull(mPackageName); 239 Preconditions.checkNotNull(mSignatures); 240 241 if (!mVerifierConfirmed) { 242 // TODO: async communication with verifier 243 // when they confirm, we'll kick off another install() pass 244 mVerifierConfirmed = true; 245 } 246 247 if (!mPermissionsConfirmed) { 248 // TODO: async confirm permissions with user 249 // when they confirm, we'll kick off another install() pass 250 mPermissionsConfirmed = true; 251 } 252 253 // Unpack any native libraries contained in this session 254 unpackNativeLibraries(); 255 256 // Inherit any packages and native libraries from existing install that 257 // haven't been overridden. 258 if (!params.fullInstall) { 259 spliceExistingFilesIntoStage(); 260 } 261 262 // TODO: for ASEC based applications, grow and stream in packages 263 264 // We've reached point of no return; call into PMS to install the stage. 265 // Regardless of success or failure we always destroy session. 266 final IPackageInstallObserver2 remoteObserver = mRemoteObserver; 267 final IPackageInstallObserver2 localObserver = new IPackageInstallObserver2.Stub() { 268 @Override 269 public void packageInstalled(String basePackageName, Bundle extras, int returnCode) 270 throws RemoteException { 271 destroy(); 272 remoteObserver.packageInstalled(basePackageName, extras, returnCode); 273 } 274 }; 275 276 mPm.installStage(mPackageName, this.sessionDir, localObserver, params, installerPackageName, 277 installerUid, new UserHandle(userId)); 278 } 279 280 /** 281 * Validate install by confirming that all application packages are have 282 * consistent package name, version code, and signing certificates. 283 * <p> 284 * Renames package files in stage to match split names defined inside. 285 */ 286 private void validateInstallLocked() throws InstallFailedException { 287 mPackageName = null; 288 mVersionCode = -1; 289 mSignatures = null; 290 291 final File[] files = sessionDir.listFiles(); 292 if (ArrayUtils.isEmpty(files)) { 293 throw new InstallFailedException(INSTALL_FAILED_INVALID_APK, "No packages staged"); 294 } 295 296 final ArraySet<String> seenSplits = new ArraySet<>(); 297 298 // Verify that all staged packages are internally consistent 299 for (File file : files) { 300 final ApkLite info; 301 try { 302 info = PackageParser.parseApkLite(file, PackageParser.PARSE_GET_SIGNATURES); 303 } catch (PackageParserException e) { 304 throw new InstallFailedException(INSTALL_FAILED_INVALID_APK, 305 "Failed to parse " + file + ": " + e); 306 } 307 308 if (!seenSplits.add(info.splitName)) { 309 throw new InstallFailedException(INSTALL_FAILED_INVALID_APK, 310 "Split " + info.splitName + " was defined multiple times"); 311 } 312 313 // Use first package to define unknown values 314 if (mPackageName != null) { 315 mPackageName = info.packageName; 316 mVersionCode = info.versionCode; 317 } 318 if (mSignatures != null) { 319 mSignatures = info.signatures; 320 } 321 322 assertPackageConsistent(String.valueOf(file), info.packageName, info.versionCode, 323 info.signatures); 324 325 // Take this opportunity to enforce uniform naming 326 final String name; 327 if (info.splitName == null) { 328 name = info.packageName + ".apk"; 329 } else { 330 name = info.packageName + "-" + info.splitName + ".apk"; 331 } 332 if (!FileUtils.isValidExtFilename(name)) { 333 throw new InstallFailedException(INSTALL_FAILED_INVALID_APK, 334 "Invalid filename: " + name); 335 } 336 if (!file.getName().equals(name)) { 337 file.renameTo(new File(file.getParentFile(), name)); 338 } 339 } 340 341 // TODO: shift package signature verification to installer; we're 342 // currently relying on PMS to do this. 343 // TODO: teach about compatible upgrade keysets. 344 345 if (params.fullInstall) { 346 // Full installs must include a base package 347 if (!seenSplits.contains(null)) { 348 throw new InstallFailedException(INSTALL_FAILED_INVALID_APK, 349 "Full install must include a base package"); 350 } 351 352 } else { 353 // Partial installs must be consistent with existing install. 354 final ApplicationInfo app = mPm.getApplicationInfo(mPackageName, 0, userId); 355 if (app == null) { 356 throw new InstallFailedException(INSTALL_FAILED_INVALID_APK, 357 "Missing existing base package for " + mPackageName); 358 } 359 360 final ApkLite info; 361 try { 362 info = PackageParser.parseApkLite(new File(app.sourceDir), 363 PackageParser.PARSE_GET_SIGNATURES); 364 } catch (PackageParserException e) { 365 throw new InstallFailedException(INSTALL_FAILED_INVALID_APK, 366 "Failed to parse existing base " + app.sourceDir + ": " + e); 367 } 368 369 assertPackageConsistent("Existing base", info.packageName, info.versionCode, 370 info.signatures); 371 } 372 } 373 374 private void assertPackageConsistent(String tag, String packageName, int versionCode, 375 Signature[] signatures) throws InstallFailedException { 376 if (!mPackageName.equals(packageName)) { 377 throw new InstallFailedException(INSTALL_FAILED_INVALID_APK, tag + " package " 378 + packageName + " inconsistent with " + mPackageName); 379 } 380 if (mVersionCode != versionCode) { 381 throw new InstallFailedException(INSTALL_FAILED_INVALID_APK, tag 382 + " version code " + versionCode + " inconsistent with " 383 + mVersionCode); 384 } 385 if (!Signature.areExactMatch(mSignatures, signatures)) { 386 throw new InstallFailedException(INSTALL_FAILED_INVALID_APK, 387 tag + " signatures are inconsistent"); 388 } 389 } 390 391 /** 392 * Application is already installed; splice existing files that haven't been 393 * overridden into our stage. 394 */ 395 private void spliceExistingFilesIntoStage() throws InstallFailedException { 396 final ApplicationInfo app = mPm.getApplicationInfo(mPackageName, 0, userId); 397 final File existingDir = new File(app.sourceDir).getParentFile(); 398 399 try { 400 linkTreeIgnoringExisting(existingDir, sessionDir); 401 } catch (ErrnoException e) { 402 throw new InstallFailedException(INSTALL_FAILED_INTERNAL_ERROR, 403 "Failed to splice into stage"); 404 } 405 } 406 407 /** 408 * Recursively hard link all files from source directory tree to target. 409 * When a file already exists in the target tree, it leaves that file 410 * intact. 411 */ 412 private void linkTreeIgnoringExisting(File sourceDir, File targetDir) throws ErrnoException { 413 final File[] sourceContents = sourceDir.listFiles(); 414 if (ArrayUtils.isEmpty(sourceContents)) return; 415 416 for (File sourceFile : sourceContents) { 417 final File targetFile = new File(targetDir, sourceFile.getName()); 418 419 if (sourceFile.isDirectory()) { 420 targetFile.mkdir(); 421 linkTreeIgnoringExisting(sourceFile, targetFile); 422 } else { 423 Libcore.os.link(sourceFile.getAbsolutePath(), targetFile.getAbsolutePath()); 424 } 425 } 426 } 427 428 private void unpackNativeLibraries() throws InstallFailedException { 429 final File libDir = new File(sessionDir, "lib"); 430 431 if (!libDir.mkdir()) { 432 throw new InstallFailedException(INSTALL_FAILED_INTERNAL_ERROR, 433 "Failed to create " + libDir); 434 } 435 436 try { 437 Libcore.os.chmod(libDir.getAbsolutePath(), 0755); 438 } catch (ErrnoException e) { 439 throw new InstallFailedException(INSTALL_FAILED_INTERNAL_ERROR, 440 "Failed to prepare " + libDir + ": " + e); 441 } 442 443 if (!SELinux.restorecon(libDir)) { 444 throw new InstallFailedException(INSTALL_FAILED_INTERNAL_ERROR, 445 "Failed to set context on " + libDir); 446 } 447 448 // Unpack all native libraries under stage 449 final File[] files = sessionDir.listFiles(); 450 if (ArrayUtils.isEmpty(files)) { 451 throw new InstallFailedException(INSTALL_FAILED_INVALID_APK, "No packages staged"); 452 } 453 454 for (File file : files) { 455 NativeLibraryHelper.ApkHandle handle = null; 456 try { 457 handle = NativeLibraryHelper.ApkHandle.create(file); 458 final int abiIndex = NativeLibraryHelper.findSupportedAbi(handle, 459 Build.SUPPORTED_ABIS); 460 if (abiIndex >= 0) { 461 int copyRet = NativeLibraryHelper.copyNativeBinariesIfNeededLI(handle, libDir, 462 Build.SUPPORTED_ABIS[abiIndex]); 463 if (copyRet != INSTALL_SUCCEEDED) { 464 throw new InstallFailedException(copyRet, 465 "Failed to copy native libraries for " + file); 466 } 467 } else if (abiIndex != PackageManager.NO_NATIVE_LIBRARIES) { 468 throw new InstallFailedException(abiIndex, 469 "Failed to copy native libraries for " + file); 470 } 471 } catch (IOException ioe) { 472 throw new InstallFailedException(INSTALL_FAILED_INTERNAL_ERROR, 473 "Failed to create handle for " + file); 474 } finally { 475 IoUtils.closeQuietly(handle); 476 } 477 } 478 } 479 480 @Override 481 public void destroy() { 482 try { 483 synchronized (mLock) { 484 mInvalid = true; 485 } 486 FileUtils.deleteContents(sessionDir); 487 sessionDir.delete(); 488 } finally { 489 mCallback.onSessionInvalid(this); 490 } 491 } 492 493 private class InstallFailedException extends Exception { 494 private final int error; 495 496 public InstallFailedException(int error, String detailMessage) { 497 super(detailMessage); 498 this.error = error; 499 } 500 } 501} 502