| /* |
| * Copyright (C) 2019 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.server.pm; |
| |
| import android.annotation.NonNull; |
| import android.content.ComponentName; |
| import android.content.pm.DataLoaderParams; |
| import android.content.pm.InstallationFile; |
| import android.content.pm.PackageInstaller; |
| import android.os.ParcelFileDescriptor; |
| import android.os.ShellCommand; |
| import android.service.dataloader.DataLoaderService; |
| import android.util.Slog; |
| import android.util.SparseArray; |
| |
| import libcore.io.IoUtils; |
| |
| import java.io.IOException; |
| import java.lang.ref.WeakReference; |
| import java.nio.charset.StandardCharsets; |
| import java.security.SecureRandom; |
| import java.util.Collection; |
| |
| /** |
| * Callback data loader for PackageManagerShellCommand installations. |
| */ |
| public class PackageManagerShellCommandDataLoader extends DataLoaderService { |
| public static final String TAG = "PackageManagerShellCommandDataLoader"; |
| |
| private static final String PACKAGE = "android"; |
| private static final String CLASS = PackageManagerShellCommandDataLoader.class.getName(); |
| |
| static final SecureRandom sRandom = new SecureRandom(); |
| static final SparseArray<WeakReference<ShellCommand>> sShellCommands = new SparseArray<>(); |
| |
| private static final char ARGS_DELIM = '&'; |
| private static final String SHELL_COMMAND_ID_PREFIX = "shellCommandId="; |
| private static final int INVALID_SHELL_COMMAND_ID = -1; |
| private static final int TOO_MANY_PENDING_SHELL_COMMANDS = 10; |
| |
| private static final String STDIN_PATH = "-"; |
| |
| private static String getDataLoaderParamsArgs(ShellCommand shellCommand) { |
| nativeInitialize(); |
| |
| int commandId; |
| synchronized (sShellCommands) { |
| // Clean up old references. |
| for (int i = sShellCommands.size() - 1; i >= 0; i--) { |
| WeakReference<ShellCommand> oldRef = sShellCommands.valueAt(i); |
| if (oldRef.get() == null) { |
| sShellCommands.removeAt(i); |
| } |
| } |
| |
| // Sanity check. |
| if (sShellCommands.size() > TOO_MANY_PENDING_SHELL_COMMANDS) { |
| Slog.e(TAG, "Too many pending shell commands: " + sShellCommands.size()); |
| } |
| |
| // Generate new id and put ref to the array. |
| do { |
| commandId = sRandom.nextInt(Integer.MAX_VALUE - 1) + 1; |
| } while (sShellCommands.contains(commandId)); |
| |
| sShellCommands.put(commandId, new WeakReference<>(shellCommand)); |
| } |
| |
| return SHELL_COMMAND_ID_PREFIX + commandId; |
| } |
| |
| static DataLoaderParams getStreamingDataLoaderParams(ShellCommand shellCommand) { |
| return DataLoaderParams.forStreaming(new ComponentName(PACKAGE, CLASS), |
| getDataLoaderParamsArgs(shellCommand)); |
| } |
| |
| static DataLoaderParams getIncrementalDataLoaderParams(ShellCommand shellCommand) { |
| return DataLoaderParams.forIncremental(new ComponentName(PACKAGE, CLASS), |
| getDataLoaderParamsArgs(shellCommand)); |
| } |
| |
| private static int extractShellCommandId(String args) { |
| int sessionIdIdx = args.indexOf(SHELL_COMMAND_ID_PREFIX); |
| if (sessionIdIdx < 0) { |
| Slog.e(TAG, "Missing shell command id param."); |
| return INVALID_SHELL_COMMAND_ID; |
| } |
| sessionIdIdx += SHELL_COMMAND_ID_PREFIX.length(); |
| int delimIdx = args.indexOf(ARGS_DELIM, sessionIdIdx); |
| try { |
| if (delimIdx < 0) { |
| return Integer.parseInt(args.substring(sessionIdIdx)); |
| } else { |
| return Integer.parseInt(args.substring(sessionIdIdx, delimIdx)); |
| } |
| } catch (NumberFormatException e) { |
| Slog.e(TAG, "Incorrect shell command id format.", e); |
| return INVALID_SHELL_COMMAND_ID; |
| } |
| } |
| |
| static class Metadata { |
| /** |
| * Full files read from stdin. |
| */ |
| static final byte STDIN = 0; |
| /** |
| * Full files read from local file. |
| */ |
| static final byte LOCAL_FILE = 1; |
| /** |
| * Signature tree read from stdin, data streamed. |
| */ |
| static final byte DATA_ONLY_STREAMING = 2; |
| /** |
| * Everything streamed. |
| */ |
| static final byte STREAMING = 3; |
| |
| private final byte mMode; |
| private final String mData; |
| |
| static Metadata forStdIn(String fileId) { |
| return new Metadata(STDIN, fileId); |
| } |
| |
| static Metadata forLocalFile(String filePath) { |
| return new Metadata(LOCAL_FILE, filePath); |
| } |
| |
| static Metadata forDataOnlyStreaming(String fileId) { |
| return new Metadata(DATA_ONLY_STREAMING, fileId); |
| } |
| |
| static Metadata forStreaming(String fileId) { |
| return new Metadata(STREAMING, fileId); |
| } |
| |
| private Metadata(byte mode, String data) { |
| this.mMode = mode; |
| this.mData = (data == null) ? "" : data; |
| } |
| |
| static Metadata fromByteArray(byte[] bytes) throws IOException { |
| if (bytes == null || bytes.length == 0) { |
| return null; |
| } |
| byte mode = bytes[0]; |
| String data = new String(bytes, 1, bytes.length - 1, StandardCharsets.UTF_8); |
| return new Metadata(mode, data); |
| } |
| |
| byte[] toByteArray() { |
| byte[] dataBytes = this.mData.getBytes(StandardCharsets.UTF_8); |
| byte[] result = new byte[1 + dataBytes.length]; |
| result[0] = this.mMode; |
| System.arraycopy(dataBytes, 0, result, 1, dataBytes.length); |
| return result; |
| } |
| |
| byte getMode() { |
| return this.mMode; |
| } |
| |
| String getData() { |
| return this.mData; |
| } |
| } |
| |
| private static class DataLoader implements DataLoaderService.DataLoader { |
| private DataLoaderParams mParams = null; |
| private FileSystemConnector mConnector = null; |
| |
| @Override |
| public boolean onCreate(@NonNull DataLoaderParams dataLoaderParams, |
| @NonNull FileSystemConnector connector) { |
| mParams = dataLoaderParams; |
| mConnector = connector; |
| return true; |
| } |
| |
| @Override |
| public boolean onPrepareImage(@NonNull Collection<InstallationFile> addedFiles, |
| @NonNull Collection<String> removedFiles) { |
| ShellCommand shellCommand = lookupShellCommand(mParams.getArguments()); |
| if (shellCommand == null) { |
| Slog.e(TAG, "Missing shell command."); |
| return false; |
| } |
| try { |
| for (InstallationFile file : addedFiles) { |
| Metadata metadata = Metadata.fromByteArray(file.getMetadata()); |
| if (metadata == null) { |
| Slog.e(TAG, "Invalid metadata for file: " + file.getName()); |
| return false; |
| } |
| switch (metadata.getMode()) { |
| case Metadata.STDIN: { |
| final ParcelFileDescriptor inFd = getStdInPFD(shellCommand); |
| mConnector.writeData(file.getName(), 0, file.getLengthBytes(), inFd); |
| break; |
| } |
| case Metadata.LOCAL_FILE: { |
| ParcelFileDescriptor incomingFd = null; |
| try { |
| incomingFd = getLocalFilePFD(shellCommand, metadata.getData()); |
| mConnector.writeData(file.getName(), 0, incomingFd.getStatSize(), |
| incomingFd); |
| } finally { |
| IoUtils.closeQuietly(incomingFd); |
| } |
| break; |
| } |
| default: |
| Slog.e(TAG, "Unsupported metadata mode: " + metadata.getMode()); |
| return false; |
| } |
| } |
| return true; |
| } catch (IOException e) { |
| Slog.e(TAG, "Exception while streaming files", e); |
| return false; |
| } |
| } |
| } |
| |
| static ShellCommand lookupShellCommand(String args) { |
| final int commandId = extractShellCommandId(args); |
| if (commandId == INVALID_SHELL_COMMAND_ID) { |
| return null; |
| } |
| |
| final WeakReference<ShellCommand> shellCommandRef; |
| synchronized (sShellCommands) { |
| shellCommandRef = sShellCommands.get(commandId, null); |
| } |
| final ShellCommand shellCommand = |
| shellCommandRef != null ? shellCommandRef.get() : null; |
| |
| return shellCommand; |
| } |
| |
| static ParcelFileDescriptor getStdInPFD(ShellCommand shellCommand) { |
| try { |
| return ParcelFileDescriptor.dup(shellCommand.getInFileDescriptor()); |
| } catch (IOException e) { |
| Slog.e(TAG, "Exception while obtaining STDIN fd", e); |
| return null; |
| } |
| } |
| |
| static ParcelFileDescriptor getLocalFilePFD(ShellCommand shellCommand, String filePath) { |
| return shellCommand.openFileForSystem(filePath, "r"); |
| } |
| |
| static int getStdIn(ShellCommand shellCommand) { |
| ParcelFileDescriptor pfd = getStdInPFD(shellCommand); |
| return pfd == null ? -1 : pfd.detachFd(); |
| } |
| |
| static int getLocalFile(ShellCommand shellCommand, String filePath) { |
| ParcelFileDescriptor pfd = getLocalFilePFD(shellCommand, filePath); |
| return pfd == null ? -1 : pfd.detachFd(); |
| } |
| |
| @Override |
| public DataLoaderService.DataLoader onCreateDataLoader( |
| @NonNull DataLoaderParams dataLoaderParams) { |
| if (dataLoaderParams.getType() == PackageInstaller.DATA_LOADER_TYPE_STREAMING) { |
| // This DataLoader only supports streaming installations. |
| return new DataLoader(); |
| } |
| return null; |
| } |
| |
| /* Native methods */ |
| private static native void nativeInitialize(); |
| } |