| /* |
| * Copyright (C) 2012 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; |
| |
| import android.content.Context; |
| import android.content.ContentResolver; |
| import android.database.ContentObserver; |
| import android.os.Binder; |
| import android.os.FileUtils; |
| import android.provider.Settings; |
| import android.util.Slog; |
| |
| import java.io.File; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| |
| import libcore.io.IoUtils; |
| |
| /** |
| * <p>CertBlacklister provides a simple mechanism for updating the platform blacklists for SSL |
| * certificate public keys and serial numbers. |
| */ |
| public class CertBlacklister extends Binder { |
| |
| private static final String TAG = "CertBlacklister"; |
| |
| private static final String BLACKLIST_ROOT = System.getenv("ANDROID_DATA") + "/misc/keychain/"; |
| |
| public static final String PUBKEY_PATH = BLACKLIST_ROOT + "pubkey_blacklist.txt"; |
| public static final String SERIAL_PATH = BLACKLIST_ROOT + "serial_blacklist.txt"; |
| |
| public static final String PUBKEY_BLACKLIST_KEY = "pubkey_blacklist"; |
| public static final String SERIAL_BLACKLIST_KEY = "serial_blacklist"; |
| |
| private static class BlacklistObserver extends ContentObserver { |
| |
| private final String mKey; |
| private final String mName; |
| private final String mPath; |
| private final File mTmpDir; |
| private final ContentResolver mContentResolver; |
| |
| public BlacklistObserver(String key, String name, String path, ContentResolver cr) { |
| super(null); |
| mKey = key; |
| mName = name; |
| mPath = path; |
| mTmpDir = new File(mPath).getParentFile(); |
| mContentResolver = cr; |
| } |
| |
| @Override |
| public void onChange(boolean selfChange) { |
| super.onChange(selfChange); |
| writeBlacklist(); |
| } |
| |
| public String getValue() { |
| return Settings.Secure.getString(mContentResolver, mKey); |
| } |
| |
| private void writeBlacklist() { |
| new Thread("BlacklistUpdater") { |
| public void run() { |
| synchronized(mTmpDir) { |
| String blacklist = getValue(); |
| if (blacklist != null) { |
| Slog.i(TAG, "Certificate blacklist changed, updating..."); |
| FileOutputStream out = null; |
| try { |
| // create a temporary file |
| File tmp = File.createTempFile("journal", "", mTmpDir); |
| // mark it -rw-r--r-- |
| tmp.setReadable(true, false); |
| // write to it |
| out = new FileOutputStream(tmp); |
| out.write(blacklist.getBytes()); |
| // sync to disk |
| FileUtils.sync(out); |
| // atomic rename |
| tmp.renameTo(new File(mPath)); |
| Slog.i(TAG, "Certificate blacklist updated"); |
| } catch (IOException e) { |
| Slog.e(TAG, "Failed to write blacklist", e); |
| } finally { |
| IoUtils.closeQuietly(out); |
| } |
| } |
| } |
| } |
| }.start(); |
| } |
| } |
| |
| public CertBlacklister(Context context) { |
| registerObservers(context.getContentResolver()); |
| } |
| |
| private BlacklistObserver buildPubkeyObserver(ContentResolver cr) { |
| return new BlacklistObserver(PUBKEY_BLACKLIST_KEY, |
| "pubkey", |
| PUBKEY_PATH, |
| cr); |
| } |
| |
| private BlacklistObserver buildSerialObserver(ContentResolver cr) { |
| return new BlacklistObserver(SERIAL_BLACKLIST_KEY, |
| "serial", |
| SERIAL_PATH, |
| cr); |
| } |
| |
| private void registerObservers(ContentResolver cr) { |
| // set up the public key blacklist observer |
| cr.registerContentObserver( |
| Settings.Secure.getUriFor(PUBKEY_BLACKLIST_KEY), |
| true, |
| buildPubkeyObserver(cr) |
| ); |
| |
| // set up the serial number blacklist observer |
| cr.registerContentObserver( |
| Settings.Secure.getUriFor(SERIAL_BLACKLIST_KEY), |
| true, |
| buildSerialObserver(cr) |
| ); |
| } |
| } |