Alan Viverette | 3da604b | 2020-06-10 18:34:39 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2016 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 | |
| 17 | package com.android.server.pm; |
| 18 | |
| 19 | import android.app.admin.SecurityLog; |
| 20 | import android.content.Intent; |
| 21 | import android.os.Bundle; |
| 22 | import android.os.Handler; |
| 23 | import android.os.Message; |
| 24 | |
| 25 | import com.android.internal.os.BackgroundThread; |
| 26 | |
| 27 | import java.io.File; |
| 28 | import java.io.FileInputStream; |
| 29 | import java.io.IOException; |
| 30 | import java.security.MessageDigest; |
| 31 | import java.security.NoSuchAlgorithmException; |
| 32 | import java.util.HashMap; |
| 33 | import android.util.Slog; |
| 34 | |
| 35 | public final class ProcessLoggingHandler extends Handler { |
| 36 | |
| 37 | private static final String TAG = "ProcessLoggingHandler"; |
| 38 | static final int LOG_APP_PROCESS_START_MSG = 1; |
| 39 | static final int INVALIDATE_BASE_APK_HASH_MSG = 2; |
| 40 | |
| 41 | private final HashMap<String, String> mProcessLoggingBaseApkHashes = new HashMap(); |
| 42 | |
| 43 | ProcessLoggingHandler() { |
| 44 | super(BackgroundThread.getHandler().getLooper()); |
| 45 | } |
| 46 | |
| 47 | @Override |
| 48 | public void handleMessage(Message msg) { |
| 49 | switch (msg.what) { |
| 50 | case LOG_APP_PROCESS_START_MSG: { |
| 51 | Bundle bundle = msg.getData(); |
| 52 | String processName = bundle.getString("processName"); |
| 53 | int uid = bundle.getInt("uid"); |
| 54 | String seinfo = bundle.getString("seinfo"); |
| 55 | String apkFile = bundle.getString("apkFile"); |
| 56 | int pid = bundle.getInt("pid"); |
| 57 | long startTimestamp = bundle.getLong("startTimestamp"); |
| 58 | String apkHash = computeStringHashOfApk(apkFile); |
| 59 | SecurityLog.writeEvent(SecurityLog.TAG_APP_PROCESS_START, processName, |
| 60 | startTimestamp, uid, pid, seinfo, apkHash); |
| 61 | break; |
| 62 | } |
| 63 | case INVALIDATE_BASE_APK_HASH_MSG: { |
| 64 | Bundle bundle = msg.getData(); |
| 65 | mProcessLoggingBaseApkHashes.remove(bundle.getString("apkFile")); |
| 66 | break; |
| 67 | } |
| 68 | } |
| 69 | } |
| 70 | |
| 71 | void invalidateProcessLoggingBaseApkHash(String apkPath) { |
| 72 | Bundle data = new Bundle(); |
| 73 | data.putString("apkFile", apkPath); |
| 74 | Message msg = obtainMessage(INVALIDATE_BASE_APK_HASH_MSG); |
| 75 | msg.setData(data); |
| 76 | sendMessage(msg); |
| 77 | } |
| 78 | |
| 79 | private String computeStringHashOfApk(String apkFile) { |
| 80 | if (apkFile == null) { |
| 81 | return "No APK"; |
| 82 | } |
| 83 | String apkHash = mProcessLoggingBaseApkHashes.get(apkFile); |
| 84 | if (apkHash == null) { |
| 85 | try { |
| 86 | byte[] hash = computeHashOfApkFile(apkFile); |
| 87 | StringBuilder sb = new StringBuilder(); |
| 88 | for (int i = 0; i < hash.length; i++) { |
| 89 | sb.append(String.format("%02x", hash[i])); |
| 90 | } |
| 91 | apkHash = sb.toString(); |
| 92 | mProcessLoggingBaseApkHashes.put(apkFile, apkHash); |
| 93 | } catch (IOException | NoSuchAlgorithmException e) { |
| 94 | Slog.w(TAG, "computeStringHashOfApk() failed", e); |
| 95 | } |
| 96 | } |
| 97 | return apkHash != null ? apkHash : "Failed to count APK hash"; |
| 98 | } |
| 99 | |
| 100 | private byte[] computeHashOfApkFile(String packageArchiveLocation) |
| 101 | throws IOException, NoSuchAlgorithmException { |
| 102 | MessageDigest md = MessageDigest.getInstance("SHA-256"); |
| 103 | FileInputStream input = new FileInputStream(new File(packageArchiveLocation)); |
| 104 | byte[] buffer = new byte[65536]; |
| 105 | int size; |
| 106 | while ((size = input.read(buffer)) > 0) { |
| 107 | md.update(buffer, 0, size); |
| 108 | } |
| 109 | input.close(); |
| 110 | return md.digest(); |
| 111 | } |
| 112 | } |