Benoit Goby | 4e68bd4 | 2012-04-25 18:06:00 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012 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 an |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package com.android.server.usb; |
| 18 | |
| 19 | import android.content.ActivityNotFoundException; |
| 20 | import android.content.Context; |
| 21 | import android.content.Intent; |
| 22 | import android.net.LocalSocket; |
| 23 | import android.net.LocalSocketAddress; |
| 24 | import android.os.Handler; |
| 25 | import android.os.HandlerThread; |
| 26 | import android.os.Environment; |
| 27 | import android.os.FileUtils; |
| 28 | import android.os.Looper; |
| 29 | import android.os.Message; |
| 30 | import android.os.Process; |
| 31 | import android.os.SystemClock; |
| 32 | import android.util.Slog; |
| 33 | import android.util.Base64; |
| 34 | |
| 35 | import java.lang.Thread; |
| 36 | import java.io.File; |
| 37 | import java.io.FileDescriptor; |
| 38 | import java.io.FileOutputStream; |
| 39 | import java.io.IOException; |
| 40 | import java.io.InputStream; |
| 41 | import java.io.OutputStream; |
| 42 | import java.io.PrintWriter; |
| 43 | import java.security.MessageDigest; |
| 44 | import java.util.Arrays; |
| 45 | |
| 46 | public class UsbDebuggingManager implements Runnable { |
| 47 | private static final String TAG = "UsbDebuggingManager"; |
| 48 | private static final boolean DEBUG = false; |
| 49 | |
| 50 | private final String ADBD_SOCKET = "adbd"; |
| 51 | private final String ADB_DIRECTORY = "misc/adb"; |
| 52 | private final String ADB_KEYS_FILE = "adb_keys"; |
| 53 | private final int BUFFER_SIZE = 4096; |
| 54 | |
| 55 | private final Context mContext; |
Benoit Goby | 4e68bd4 | 2012-04-25 18:06:00 -0700 | [diff] [blame] | 56 | private final Handler mHandler; |
| 57 | private final HandlerThread mHandlerThread; |
Benoit Goby | 509bf2d | 2012-08-29 15:23:30 -0700 | [diff] [blame] | 58 | private Thread mThread; |
Benoit Goby | 4e68bd4 | 2012-04-25 18:06:00 -0700 | [diff] [blame] | 59 | private boolean mAdbEnabled = false; |
| 60 | private String mFingerprints; |
| 61 | private LocalSocket mSocket = null; |
| 62 | private OutputStream mOutputStream = null; |
| 63 | |
| 64 | public UsbDebuggingManager(Context context) { |
Benoit Goby | 4e68bd4 | 2012-04-25 18:06:00 -0700 | [diff] [blame] | 65 | mHandlerThread = new HandlerThread("UsbDebuggingHandler"); |
| 66 | mHandlerThread.start(); |
| 67 | mHandler = new UsbDebuggingHandler(mHandlerThread.getLooper()); |
| 68 | mContext = context; |
| 69 | } |
| 70 | |
| 71 | private void listenToSocket() throws IOException { |
| 72 | try { |
| 73 | byte[] buffer = new byte[BUFFER_SIZE]; |
| 74 | LocalSocketAddress address = new LocalSocketAddress(ADBD_SOCKET, |
| 75 | LocalSocketAddress.Namespace.RESERVED); |
| 76 | InputStream inputStream = null; |
| 77 | |
| 78 | mSocket = new LocalSocket(); |
| 79 | mSocket.connect(address); |
| 80 | |
| 81 | mOutputStream = mSocket.getOutputStream(); |
| 82 | inputStream = mSocket.getInputStream(); |
| 83 | |
| 84 | while (true) { |
| 85 | int count = inputStream.read(buffer); |
| 86 | if (count < 0) { |
| 87 | Slog.e(TAG, "got " + count + " reading"); |
| 88 | break; |
| 89 | } |
| 90 | |
| 91 | if (buffer[0] == 'P' && buffer[1] == 'K') { |
| 92 | String key = new String(Arrays.copyOfRange(buffer, 2, count)); |
| 93 | Slog.d(TAG, "Received public key: " + key); |
| 94 | Message msg = mHandler.obtainMessage(UsbDebuggingHandler.MESSAGE_ADB_CONFIRM); |
| 95 | msg.obj = key; |
| 96 | mHandler.sendMessage(msg); |
| 97 | } |
| 98 | else { |
| 99 | Slog.e(TAG, "Wrong message: " + (new String(Arrays.copyOfRange(buffer, 0, 2)))); |
| 100 | break; |
| 101 | } |
| 102 | } |
| 103 | } catch (IOException ex) { |
| 104 | Slog.e(TAG, "Communication error: ", ex); |
| 105 | throw ex; |
| 106 | } finally { |
| 107 | closeSocket(); |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | @Override |
| 112 | public void run() { |
| 113 | while (mAdbEnabled) { |
| 114 | try { |
| 115 | listenToSocket(); |
| 116 | } catch (Exception e) { |
| 117 | /* Don't loop too fast if adbd dies, before init restarts it */ |
| 118 | SystemClock.sleep(1000); |
| 119 | } |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | private void closeSocket() { |
| 124 | try { |
| 125 | mOutputStream.close(); |
| 126 | } catch (IOException e) { |
| 127 | Slog.e(TAG, "Failed closing output stream: " + e); |
| 128 | } |
| 129 | |
| 130 | try { |
| 131 | mSocket.close(); |
| 132 | } catch (IOException ex) { |
| 133 | Slog.e(TAG, "Failed closing socket: " + ex); |
| 134 | } |
| 135 | } |
| 136 | |
| 137 | private void sendResponse(String msg) { |
| 138 | if (mOutputStream != null) { |
| 139 | try { |
| 140 | mOutputStream.write(msg.getBytes()); |
| 141 | } |
| 142 | catch (IOException ex) { |
| 143 | Slog.e(TAG, "Failed to write response:", ex); |
| 144 | } |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | class UsbDebuggingHandler extends Handler { |
| 149 | private static final int MESSAGE_ADB_ENABLED = 1; |
| 150 | private static final int MESSAGE_ADB_DISABLED = 2; |
| 151 | private static final int MESSAGE_ADB_ALLOW = 3; |
| 152 | private static final int MESSAGE_ADB_DENY = 4; |
| 153 | private static final int MESSAGE_ADB_CONFIRM = 5; |
Benoit Goby | cd7a17c | 2012-12-21 16:44:50 -0800 | [diff] [blame] | 154 | private static final int MESSAGE_ADB_CLEAR = 6; |
Benoit Goby | 4e68bd4 | 2012-04-25 18:06:00 -0700 | [diff] [blame] | 155 | |
| 156 | public UsbDebuggingHandler(Looper looper) { |
| 157 | super(looper); |
| 158 | } |
| 159 | |
| 160 | public void handleMessage(Message msg) { |
| 161 | switch (msg.what) { |
| 162 | case MESSAGE_ADB_ENABLED: |
| 163 | if (mAdbEnabled) |
| 164 | break; |
| 165 | |
| 166 | mAdbEnabled = true; |
| 167 | |
Benoit Goby | 509bf2d | 2012-08-29 15:23:30 -0700 | [diff] [blame] | 168 | mThread = new Thread(UsbDebuggingManager.this); |
Benoit Goby | 4e68bd4 | 2012-04-25 18:06:00 -0700 | [diff] [blame] | 169 | mThread.start(); |
| 170 | |
| 171 | break; |
| 172 | |
| 173 | case MESSAGE_ADB_DISABLED: |
| 174 | if (!mAdbEnabled) |
| 175 | break; |
| 176 | |
| 177 | mAdbEnabled = false; |
| 178 | closeSocket(); |
| 179 | |
| 180 | try { |
| 181 | mThread.join(); |
| 182 | } catch (Exception ex) { |
| 183 | } |
| 184 | |
Benoit Goby | 509bf2d | 2012-08-29 15:23:30 -0700 | [diff] [blame] | 185 | mThread = null; |
Benoit Goby | 4e68bd4 | 2012-04-25 18:06:00 -0700 | [diff] [blame] | 186 | mOutputStream = null; |
| 187 | mSocket = null; |
Benoit Goby | 37ce5c5 | 2012-08-29 13:49:07 -0700 | [diff] [blame] | 188 | break; |
Benoit Goby | 4e68bd4 | 2012-04-25 18:06:00 -0700 | [diff] [blame] | 189 | |
| 190 | case MESSAGE_ADB_ALLOW: { |
| 191 | String key = (String)msg.obj; |
| 192 | String fingerprints = getFingerprints(key); |
| 193 | |
| 194 | if (!fingerprints.equals(mFingerprints)) { |
| 195 | Slog.e(TAG, "Fingerprints do not match. Got " |
| 196 | + fingerprints + ", expected " + mFingerprints); |
| 197 | break; |
| 198 | } |
| 199 | |
| 200 | if (msg.arg1 == 1) { |
| 201 | writeKey(key); |
| 202 | } |
| 203 | |
| 204 | sendResponse("OK"); |
| 205 | break; |
| 206 | } |
| 207 | |
| 208 | case MESSAGE_ADB_DENY: |
| 209 | sendResponse("NO"); |
| 210 | break; |
| 211 | |
| 212 | case MESSAGE_ADB_CONFIRM: { |
| 213 | String key = (String)msg.obj; |
| 214 | mFingerprints = getFingerprints(key); |
| 215 | showConfirmationDialog(key, mFingerprints); |
| 216 | break; |
| 217 | } |
Benoit Goby | cd7a17c | 2012-12-21 16:44:50 -0800 | [diff] [blame] | 218 | |
| 219 | case MESSAGE_ADB_CLEAR: |
| 220 | deleteKeyFile(); |
| 221 | break; |
Benoit Goby | 4e68bd4 | 2012-04-25 18:06:00 -0700 | [diff] [blame] | 222 | } |
| 223 | } |
| 224 | } |
| 225 | |
| 226 | private String getFingerprints(String key) { |
| 227 | String hex = "0123456789ABCDEF"; |
| 228 | StringBuilder sb = new StringBuilder(); |
| 229 | MessageDigest digester; |
| 230 | |
| 231 | try { |
| 232 | digester = MessageDigest.getInstance("MD5"); |
| 233 | } catch (Exception ex) { |
| 234 | Slog.e(TAG, "Error getting digester: " + ex); |
| 235 | return ""; |
| 236 | } |
| 237 | |
| 238 | byte[] base64_data = key.split("\\s+")[0].getBytes(); |
| 239 | byte[] digest = digester.digest(Base64.decode(base64_data, Base64.DEFAULT)); |
| 240 | |
| 241 | for (int i = 0; i < digest.length; i++) { |
| 242 | sb.append(hex.charAt((digest[i] >> 4) & 0xf)); |
| 243 | sb.append(hex.charAt(digest[i] & 0xf)); |
| 244 | if (i < digest.length - 1) |
| 245 | sb.append(":"); |
| 246 | } |
| 247 | return sb.toString(); |
| 248 | } |
| 249 | |
| 250 | private void showConfirmationDialog(String key, String fingerprints) { |
| 251 | Intent dialogIntent = new Intent(); |
| 252 | |
| 253 | dialogIntent.setClassName("com.android.systemui", |
| 254 | "com.android.systemui.usb.UsbDebuggingActivity"); |
| 255 | dialogIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); |
| 256 | dialogIntent.putExtra("key", key); |
| 257 | dialogIntent.putExtra("fingerprints", fingerprints); |
| 258 | try { |
| 259 | mContext.startActivity(dialogIntent); |
| 260 | } catch (ActivityNotFoundException e) { |
| 261 | Slog.e(TAG, "unable to start UsbDebuggingActivity"); |
| 262 | } |
| 263 | } |
| 264 | |
Benoit Goby | cd7a17c | 2012-12-21 16:44:50 -0800 | [diff] [blame] | 265 | private File getUserKeyFile() { |
Benoit Goby | 4e68bd4 | 2012-04-25 18:06:00 -0700 | [diff] [blame] | 266 | File dataDir = Environment.getDataDirectory(); |
| 267 | File adbDir = new File(dataDir, ADB_DIRECTORY); |
| 268 | |
| 269 | if (!adbDir.exists()) { |
| 270 | Slog.e(TAG, "ADB data directory does not exist"); |
Benoit Goby | cd7a17c | 2012-12-21 16:44:50 -0800 | [diff] [blame] | 271 | return null; |
Benoit Goby | 4e68bd4 | 2012-04-25 18:06:00 -0700 | [diff] [blame] | 272 | } |
| 273 | |
Benoit Goby | cd7a17c | 2012-12-21 16:44:50 -0800 | [diff] [blame] | 274 | return new File(adbDir, ADB_KEYS_FILE); |
| 275 | } |
| 276 | |
| 277 | private void writeKey(String key) { |
Benoit Goby | 4e68bd4 | 2012-04-25 18:06:00 -0700 | [diff] [blame] | 278 | try { |
Benoit Goby | cd7a17c | 2012-12-21 16:44:50 -0800 | [diff] [blame] | 279 | File keyFile = getUserKeyFile(); |
| 280 | |
| 281 | if (keyFile == null) { |
| 282 | return; |
| 283 | } |
Benoit Goby | 4e68bd4 | 2012-04-25 18:06:00 -0700 | [diff] [blame] | 284 | |
| 285 | if (!keyFile.exists()) { |
| 286 | keyFile.createNewFile(); |
| 287 | FileUtils.setPermissions(keyFile.toString(), |
| 288 | FileUtils.S_IRUSR | FileUtils.S_IWUSR | |
| 289 | FileUtils.S_IRGRP, -1, -1); |
| 290 | } |
| 291 | |
| 292 | FileOutputStream fo = new FileOutputStream(keyFile, true); |
| 293 | fo.write(key.getBytes()); |
| 294 | fo.write('\n'); |
| 295 | fo.close(); |
| 296 | } |
| 297 | catch (IOException ex) { |
| 298 | Slog.e(TAG, "Error writing key:" + ex); |
| 299 | } |
| 300 | } |
| 301 | |
Benoit Goby | cd7a17c | 2012-12-21 16:44:50 -0800 | [diff] [blame] | 302 | private void deleteKeyFile() { |
| 303 | File keyFile = getUserKeyFile(); |
| 304 | if (keyFile != null) { |
| 305 | keyFile.delete(); |
| 306 | } |
| 307 | } |
Benoit Goby | 4e68bd4 | 2012-04-25 18:06:00 -0700 | [diff] [blame] | 308 | |
| 309 | public void setAdbEnabled(boolean enabled) { |
| 310 | mHandler.sendEmptyMessage(enabled ? UsbDebuggingHandler.MESSAGE_ADB_ENABLED |
| 311 | : UsbDebuggingHandler.MESSAGE_ADB_DISABLED); |
| 312 | } |
| 313 | |
| 314 | public void allowUsbDebugging(boolean alwaysAllow, String publicKey) { |
| 315 | Message msg = mHandler.obtainMessage(UsbDebuggingHandler.MESSAGE_ADB_ALLOW); |
| 316 | msg.arg1 = alwaysAllow ? 1 : 0; |
| 317 | msg.obj = publicKey; |
| 318 | mHandler.sendMessage(msg); |
| 319 | } |
| 320 | |
| 321 | public void denyUsbDebugging() { |
| 322 | mHandler.sendEmptyMessage(UsbDebuggingHandler.MESSAGE_ADB_DENY); |
| 323 | } |
| 324 | |
Benoit Goby | cd7a17c | 2012-12-21 16:44:50 -0800 | [diff] [blame] | 325 | public void clearUsbDebuggingKeys() { |
| 326 | mHandler.sendEmptyMessage(UsbDebuggingHandler.MESSAGE_ADB_CLEAR); |
| 327 | } |
Benoit Goby | 4e68bd4 | 2012-04-25 18:06:00 -0700 | [diff] [blame] | 328 | |
| 329 | public void dump(FileDescriptor fd, PrintWriter pw) { |
| 330 | pw.println(" USB Debugging State:"); |
| 331 | pw.println(" Connected to adbd: " + (mOutputStream != null)); |
| 332 | pw.println(" Last key received: " + mFingerprints); |
| 333 | pw.println(" User keys:"); |
| 334 | try { |
| 335 | pw.println(FileUtils.readTextFile(new File("/data/misc/adb/adb_keys"), 0, null)); |
| 336 | } catch (IOException e) { |
| 337 | pw.println("IOException: " + e); |
| 338 | } |
| 339 | pw.println(" System keys:"); |
| 340 | try { |
| 341 | pw.println(FileUtils.readTextFile(new File("/adb_keys"), 0, null)); |
| 342 | } catch (IOException e) { |
| 343 | pw.println("IOException: " + e); |
| 344 | } |
| 345 | } |
| 346 | } |