PackageInstallerSession.java revision 275e085d5a42ced54bb79e40ff76c77539e7d82d
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.system.ErrnoException; 45import android.system.OsConstants; 46import android.system.StructStat; 47import android.util.ArraySet; 48import android.util.Slog; 49 50import com.android.internal.content.NativeLibraryHelper; 51import com.android.internal.util.ArrayUtils; 52import com.android.internal.util.Preconditions; 53 54import libcore.io.Libcore; 55 56import java.io.File; 57import java.io.FileDescriptor; 58import java.io.IOException; 59import java.util.ArrayList; 60 61public class PackageInstallerSession extends IPackageInstallerSession.Stub { 62 private static final String TAG = "PackageInstaller"; 63 64 private final PackageInstallerService.Callback mCallback; 65 private final PackageManagerService mPm; 66 private final Handler mHandler; 67 68 public final int sessionId; 69 public final int userId; 70 public final String installerPackageName; 71 /** UID not persisted */ 72 public final int installerUid; 73 public final PackageInstallerParams params; 74 public final long createdMillis; 75 public final File sessionDir; 76 77 private static final int MSG_INSTALL = 0; 78 79 private Handler.Callback mHandlerCallback = new Handler.Callback() { 80 @Override 81 public boolean handleMessage(Message msg) { 82 synchronized (mLock) { 83 if (msg.obj != null) { 84 mRemoteObserver = (IPackageInstallObserver2) msg.obj; 85 } 86 87 try { 88 installLocked(); 89 } catch (InstallFailedException e) { 90 Slog.e(TAG, "Install failed: " + e); 91 try { 92 mRemoteObserver.packageInstalled(mPackageName, null, e.error); 93 } catch (RemoteException ignored) { 94 } 95 } 96 97 return true; 98 } 99 } 100 }; 101 102 private final Object mLock = new Object(); 103 104 private int mProgress; 105 106 private String mPackageName; 107 private int mVersionCode; 108 private Signature[] mSignatures; 109 110 private boolean mMutationsAllowed; 111 private boolean mVerifierConfirmed; 112 private boolean mPermissionsConfirmed; 113 private boolean mInvalid; 114 115 private ArrayList<FileBridge> mBridges = new ArrayList<>(); 116 117 private IPackageInstallObserver2 mRemoteObserver; 118 119 public PackageInstallerSession(PackageInstallerService.Callback callback, 120 PackageManagerService pm, int sessionId, int userId, String installerPackageName, 121 int installerUid, PackageInstallerParams params, long createdMillis, File sessionDir, 122 Looper looper) { 123 mCallback = callback; 124 mPm = pm; 125 mHandler = new Handler(looper, mHandlerCallback); 126 127 this.sessionId = sessionId; 128 this.userId = userId; 129 this.installerPackageName = installerPackageName; 130 this.installerUid = installerUid; 131 this.params = params; 132 this.createdMillis = createdMillis; 133 this.sessionDir = sessionDir; 134 135 // Check against any explicitly provided signatures 136 mSignatures = params.signatures; 137 138 // TODO: splice in flag when restoring persisted session 139 mMutationsAllowed = true; 140 141 if (pm.checkPermission(android.Manifest.permission.INSTALL_PACKAGES, installerPackageName) 142 == PackageManager.PERMISSION_GRANTED) { 143 mPermissionsConfirmed = true; 144 } 145 } 146 147 @Override 148 public void updateProgress(int progress) { 149 mProgress = progress; 150 mCallback.onProgressChanged(this); 151 } 152 153 @Override 154 public ParcelFileDescriptor openWrite(String name, long offsetBytes, long lengthBytes) { 155 // TODO: relay over to DCS when installing to ASEC 156 157 // Quick sanity check of state, and allocate a pipe for ourselves. We 158 // then do heavy disk allocation outside the lock, but this open pipe 159 // will block any attempted install transitions. 160 final FileBridge bridge; 161 synchronized (mLock) { 162 if (!mMutationsAllowed) { 163 throw new IllegalStateException("Mutations not allowed"); 164 } 165 166 bridge = new FileBridge(); 167 mBridges.add(bridge); 168 } 169 170 try { 171 // Use installer provided name for now; we always rename later 172 if (!FileUtils.isValidExtFilename(name)) { 173 throw new IllegalArgumentException("Invalid name: " + name); 174 } 175 final File target = new File(sessionDir, name); 176 177 final FileDescriptor targetFd = Libcore.os.open(target.getAbsolutePath(), 178 OsConstants.O_CREAT | OsConstants.O_WRONLY, 00700); 179 180 // If caller specified a total length, allocate it for them. Free up 181 // cache space to grow, if needed. 182 if (lengthBytes > 0) { 183 final StructStat stat = Libcore.os.fstat(targetFd); 184 final long deltaBytes = lengthBytes - stat.st_size; 185 if (deltaBytes > 0) { 186 mPm.freeStorage(deltaBytes); 187 } 188 Libcore.os.posix_fallocate(targetFd, 0, lengthBytes); 189 } 190 191 if (offsetBytes > 0) { 192 Libcore.os.lseek(targetFd, offsetBytes, OsConstants.SEEK_SET); 193 } 194 195 bridge.setTargetFile(targetFd); 196 bridge.start(); 197 return new ParcelFileDescriptor(bridge.getClientSocket()); 198 199 } catch (ErrnoException e) { 200 throw new IllegalStateException("Failed to write", e); 201 } catch (IOException e) { 202 throw new IllegalStateException("Failed to write", e); 203 } 204 } 205 206 @Override 207 public void install(IPackageInstallObserver2 observer) { 208 Preconditions.checkNotNull(observer); 209 mHandler.obtainMessage(MSG_INSTALL, observer).sendToTarget(); 210 } 211 212 private void installLocked() throws InstallFailedException { 213 if (mInvalid) { 214 throw new InstallFailedException(INSTALL_FAILED_ALREADY_EXISTS, "Invalid session"); 215 } 216 217 // Verify that all writers are hands-off 218 if (mMutationsAllowed) { 219 for (FileBridge bridge : mBridges) { 220 if (!bridge.isClosed()) { 221 throw new InstallFailedException(INSTALL_FAILED_PACKAGE_CHANGED, 222 "Files still open"); 223 } 224 } 225 mMutationsAllowed = false; 226 227 // TODO: persist disabled mutations before going forward, since 228 // beyond this point we may have hardlinks to the valid install 229 } 230 231 // Verify that stage looks sane with respect to existing application. 232 // This currently only ensures packageName, versionCode, and certificate 233 // consistency. 234 validateInstallLocked(); 235 236 Preconditions.checkNotNull(mPackageName); 237 Preconditions.checkNotNull(mSignatures); 238 239 if (!mVerifierConfirmed) { 240 // TODO: async communication with verifier 241 // when they confirm, we'll kick off another install() pass 242 mVerifierConfirmed = true; 243 } 244 245 if (!mPermissionsConfirmed) { 246 // TODO: async confirm permissions with user 247 // when they confirm, we'll kick off another install() pass 248 mPermissionsConfirmed = true; 249 } 250 251 // Unpack any native libraries contained in this session 252 unpackNativeLibraries(); 253 254 // Inherit any packages and native libraries from existing install that 255 // haven't been overridden. 256 if (!params.fullInstall) { 257 spliceExistingFilesIntoStage(); 258 } 259 260 // TODO: for ASEC based applications, grow and stream in packages 261 262 // We've reached point of no return; call into PMS to install the stage. 263 // Regardless of success or failure we always destroy session. 264 final IPackageInstallObserver2 remoteObserver = mRemoteObserver; 265 final IPackageInstallObserver2 localObserver = new IPackageInstallObserver2.Stub() { 266 @Override 267 public void packageInstalled(String basePackageName, Bundle extras, int returnCode) 268 throws RemoteException { 269 destroy(); 270 remoteObserver.packageInstalled(basePackageName, extras, returnCode); 271 } 272 }; 273 274 mPm.installStage(mPackageName, this.sessionDir, localObserver, params.installFlags); 275 } 276 277 /** 278 * Validate install by confirming that all application packages are have 279 * consistent package name, version code, and signing certificates. 280 * <p> 281 * Renames package files in stage to match split names defined inside. 282 */ 283 private void validateInstallLocked() throws InstallFailedException { 284 mPackageName = null; 285 mVersionCode = -1; 286 mSignatures = null; 287 288 final File[] files = sessionDir.listFiles(); 289 if (ArrayUtils.isEmpty(files)) { 290 throw new InstallFailedException(INSTALL_FAILED_INVALID_APK, "No packages staged"); 291 } 292 293 final ArraySet<String> seenSplits = new ArraySet<>(); 294 295 // Verify that all staged packages are internally consistent 296 for (File file : files) { 297 final ApkLite info; 298 try { 299 info = PackageParser.parseApkLite(file, PackageParser.PARSE_GET_SIGNATURES); 300 } catch (PackageParserException e) { 301 throw new InstallFailedException(INSTALL_FAILED_INVALID_APK, 302 "Failed to parse " + file + ": " + e); 303 } 304 305 if (!seenSplits.add(info.splitName)) { 306 throw new InstallFailedException(INSTALL_FAILED_INVALID_APK, 307 "Split " + info.splitName + " was defined multiple times"); 308 } 309 310 // Use first package to define unknown values 311 if (mPackageName != null) { 312 mPackageName = info.packageName; 313 mVersionCode = info.versionCode; 314 } 315 if (mSignatures != null) { 316 mSignatures = info.signatures; 317 } 318 319 assertPackageConsistent(String.valueOf(file), info.packageName, info.versionCode, 320 info.signatures); 321 322 // Take this opportunity to enforce uniform naming 323 final String name; 324 if (info.splitName == null) { 325 name = info.packageName + ".apk"; 326 } else { 327 name = info.packageName + "-" + info.splitName + ".apk"; 328 } 329 if (!FileUtils.isValidExtFilename(name)) { 330 throw new InstallFailedException(INSTALL_FAILED_INVALID_APK, 331 "Invalid filename: " + name); 332 } 333 if (!file.getName().equals(name)) { 334 file.renameTo(new File(file.getParentFile(), name)); 335 } 336 } 337 338 // TODO: shift package signature verification to installer; we're 339 // currently relying on PMS to do this. 340 // TODO: teach about compatible upgrade keysets. 341 342 if (params.fullInstall) { 343 // Full installs must include a base package 344 if (!seenSplits.contains(null)) { 345 throw new InstallFailedException(INSTALL_FAILED_INVALID_APK, 346 "Full install must include a base package"); 347 } 348 349 } else { 350 // Partial installs must be consistent with existing install. 351 final ApplicationInfo app = mPm.getApplicationInfo(mPackageName, 0, userId); 352 if (app == null) { 353 throw new InstallFailedException(INSTALL_FAILED_INVALID_APK, 354 "Missing existing base package for " + mPackageName); 355 } 356 357 final ApkLite info; 358 try { 359 info = PackageParser.parseApkLite(new File(app.sourceDir), 360 PackageParser.PARSE_GET_SIGNATURES); 361 } catch (PackageParserException e) { 362 throw new InstallFailedException(INSTALL_FAILED_INVALID_APK, 363 "Failed to parse existing base " + app.sourceDir + ": " + e); 364 } 365 366 assertPackageConsistent("Existing base", info.packageName, info.versionCode, 367 info.signatures); 368 } 369 } 370 371 private void assertPackageConsistent(String tag, String packageName, int versionCode, 372 Signature[] signatures) throws InstallFailedException { 373 if (!mPackageName.equals(packageName)) { 374 throw new InstallFailedException(INSTALL_FAILED_INVALID_APK, tag + " package " 375 + packageName + " inconsistent with " + mPackageName); 376 } 377 if (mVersionCode != versionCode) { 378 throw new InstallFailedException(INSTALL_FAILED_INVALID_APK, tag 379 + " version code " + versionCode + " inconsistent with " 380 + mVersionCode); 381 } 382 if (!Signature.areExactMatch(mSignatures, signatures)) { 383 throw new InstallFailedException(INSTALL_FAILED_INVALID_APK, 384 tag + " signatures are inconsistent"); 385 } 386 } 387 388 /** 389 * Application is already installed; splice existing files that haven't been 390 * overridden into our stage. 391 */ 392 private void spliceExistingFilesIntoStage() throws InstallFailedException { 393 final ApplicationInfo app = mPm.getApplicationInfo(mPackageName, 0, userId); 394 final File existingDir = new File(app.sourceDir).getParentFile(); 395 396 try { 397 linkTreeIgnoringExisting(existingDir, sessionDir); 398 } catch (ErrnoException e) { 399 throw new InstallFailedException(INSTALL_FAILED_INTERNAL_ERROR, 400 "Failed to splice into stage"); 401 } 402 } 403 404 /** 405 * Recursively hard link all files from source directory tree to target. 406 * When a file already exists in the target tree, it leaves that file 407 * intact. 408 */ 409 private void linkTreeIgnoringExisting(File sourceDir, File targetDir) throws ErrnoException { 410 final File[] sourceContents = sourceDir.listFiles(); 411 if (ArrayUtils.isEmpty(sourceContents)) return; 412 413 for (File sourceFile : sourceContents) { 414 final File targetFile = new File(targetDir, sourceFile.getName()); 415 416 if (sourceFile.isDirectory()) { 417 targetFile.mkdir(); 418 linkTreeIgnoringExisting(sourceFile, targetFile); 419 } else { 420 Libcore.os.link(sourceFile.getAbsolutePath(), targetFile.getAbsolutePath()); 421 } 422 } 423 } 424 425 private void unpackNativeLibraries() throws InstallFailedException { 426 final File libDir = new File(sessionDir, "lib"); 427 428 if (!libDir.mkdir()) { 429 throw new InstallFailedException(INSTALL_FAILED_INTERNAL_ERROR, 430 "Failed to create " + libDir); 431 } 432 433 try { 434 Libcore.os.chmod(libDir.getAbsolutePath(), 0755); 435 } catch (ErrnoException e) { 436 throw new InstallFailedException(INSTALL_FAILED_INTERNAL_ERROR, 437 "Failed to prepare " + libDir + ": " + e); 438 } 439 440 if (!SELinux.restorecon(libDir)) { 441 throw new InstallFailedException(INSTALL_FAILED_INTERNAL_ERROR, 442 "Failed to set context on " + libDir); 443 } 444 445 // Unpack all native libraries under stage 446 final File[] files = sessionDir.listFiles(); 447 if (ArrayUtils.isEmpty(files)) { 448 throw new InstallFailedException(INSTALL_FAILED_INVALID_APK, "No packages staged"); 449 } 450 451 for (File file : files) { 452 final NativeLibraryHelper.ApkHandle handle = new NativeLibraryHelper.ApkHandle(file); 453 try { 454 final int abiIndex = NativeLibraryHelper.findSupportedAbi(handle, 455 Build.SUPPORTED_ABIS); 456 if (abiIndex >= 0) { 457 int copyRet = NativeLibraryHelper.copyNativeBinariesIfNeededLI(handle, libDir, 458 Build.SUPPORTED_ABIS[abiIndex]); 459 if (copyRet != INSTALL_SUCCEEDED) { 460 throw new InstallFailedException(copyRet, 461 "Failed to copy native libraries for " + file); 462 } 463 } else if (abiIndex != PackageManager.NO_NATIVE_LIBRARIES) { 464 throw new InstallFailedException(abiIndex, 465 "Failed to copy native libraries for " + file); 466 } 467 } finally { 468 handle.close(); 469 } 470 } 471 } 472 473 @Override 474 public void destroy() { 475 try { 476 synchronized (mLock) { 477 mInvalid = true; 478 } 479 FileUtils.deleteContents(sessionDir); 480 sessionDir.delete(); 481 } finally { 482 mCallback.onSessionInvalid(this); 483 } 484 } 485 486 private class InstallFailedException extends Exception { 487 private final int error; 488 489 public InstallFailedException(int error, String detailMessage) { 490 super(detailMessage); 491 this.error = error; 492 } 493 } 494} 495