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 and 14 * limitations under the License. 15 */ 16 17package org.bouncycastle.jce.provider; 18 19import java.io.Closeable; 20import java.io.ByteArrayOutputStream; 21import java.io.FileNotFoundException; 22import java.io.IOException; 23import java.io.RandomAccessFile; 24import java.math.BigInteger; 25import java.security.PublicKey; 26import java.util.Arrays; 27import java.util.Collections; 28import java.util.HashSet; 29import java.util.Set; 30import java.util.logging.Level; 31import java.util.logging.Logger; 32import org.bouncycastle.crypto.Digest; 33import org.bouncycastle.crypto.digests.AndroidDigestFactory; 34import org.bouncycastle.util.encoders.Hex; 35 36public class CertBlacklist { 37 38 private static final String ANDROID_DATA = System.getenv("ANDROID_DATA"); 39 private static final String BLACKLIST_ROOT = ANDROID_DATA + "/misc/keychain/"; 40 public static final String DEFAULT_PUBKEY_BLACKLIST_PATH = BLACKLIST_ROOT + "pubkey_blacklist.txt"; 41 public static final String DEFAULT_SERIAL_BLACKLIST_PATH = BLACKLIST_ROOT + "serial_blacklist.txt"; 42 43 private static final Logger logger = Logger.getLogger(CertBlacklist.class.getName()); 44 45 // public for testing 46 public final Set<BigInteger> serialBlacklist; 47 public final Set<byte[]> pubkeyBlacklist; 48 49 public CertBlacklist() { 50 this(DEFAULT_PUBKEY_BLACKLIST_PATH, DEFAULT_SERIAL_BLACKLIST_PATH); 51 } 52 53 /** Test only interface, not for public use */ 54 public CertBlacklist(String pubkeyBlacklistPath, String serialBlacklistPath) { 55 serialBlacklist = readSerialBlackList(serialBlacklistPath); 56 pubkeyBlacklist = readPublicKeyBlackList(pubkeyBlacklistPath); 57 } 58 59 private static boolean isHex(String value) { 60 try { 61 new BigInteger(value, 16); 62 return true; 63 } catch (NumberFormatException e) { 64 logger.log(Level.WARNING, "Could not parse hex value " + value, e); 65 return false; 66 } 67 } 68 69 private static boolean isPubkeyHash(String value) { 70 if (value.length() != 40) { 71 logger.log(Level.WARNING, "Invalid pubkey hash length: " + value.length()); 72 return false; 73 } 74 return isHex(value); 75 } 76 77 private static String readBlacklist(String path) { 78 try { 79 return readFileAsString(path); 80 } catch (FileNotFoundException ignored) { 81 } catch (IOException e) { 82 logger.log(Level.WARNING, "Could not read blacklist", e); 83 } 84 return ""; 85 } 86 87 // From IoUtils.readFileAsString 88 private static String readFileAsString(String path) throws IOException { 89 return readFileAsBytes(path).toString("UTF-8"); 90 } 91 92 // Based on IoUtils.readFileAsBytes 93 private static ByteArrayOutputStream readFileAsBytes(String path) throws IOException { 94 RandomAccessFile f = null; 95 try { 96 f = new RandomAccessFile(path, "r"); 97 ByteArrayOutputStream bytes = new ByteArrayOutputStream((int) f.length()); 98 byte[] buffer = new byte[8192]; 99 while (true) { 100 int byteCount = f.read(buffer); 101 if (byteCount == -1) { 102 return bytes; 103 } 104 bytes.write(buffer, 0, byteCount); 105 } 106 } finally { 107 closeQuietly(f); 108 } 109 } 110 111 // Base on IoUtils.closeQuietly 112 private static void closeQuietly(Closeable closeable) { 113 if (closeable != null) { 114 try { 115 closeable.close(); 116 } catch (RuntimeException rethrown) { 117 throw rethrown; 118 } catch (Exception ignored) { 119 } 120 } 121 } 122 123 private static final Set<BigInteger> readSerialBlackList(String path) { 124 125 // start out with a base set of known bad values 126 Set<BigInteger> bl = new HashSet<BigInteger>(Arrays.asList( 127 // From http://src.chromium.org/viewvc/chrome/trunk/src/net/base/x509_certificate.cc?revision=78748&view=markup 128 // Not a real certificate. For testing only. 129 new BigInteger("077a59bcd53459601ca6907267a6dd1c", 16), 130 new BigInteger("047ecbe9fca55f7bd09eae36e10cae1e", 16), 131 new BigInteger("d8f35f4eb7872b2dab0692e315382fb0", 16), 132 new BigInteger("b0b7133ed096f9b56fae91c874bd3ac0", 16), 133 new BigInteger("9239d5348f40d1695a745470e1f23f43", 16), 134 new BigInteger("e9028b9578e415dc1a710a2b88154447", 16), 135 new BigInteger("d7558fdaf5f1105bb213282b707729a3", 16), 136 new BigInteger("f5c86af36162f13a64f54f6dc9587c06", 16), 137 new BigInteger("392a434f0e07df1f8aa305de34e0c229", 16), 138 new BigInteger("3e75ced46b693021218830ae86a82a71", 16), 139 new BigInteger("864", 16), 140 new BigInteger("827", 16) 141 )); 142 143 // attempt to augment it with values taken from gservices 144 String serialBlacklist = readBlacklist(path); 145 if (!serialBlacklist.equals("")) { 146 for(String value : serialBlacklist.split(",")) { 147 try { 148 bl.add(new BigInteger(value, 16)); 149 } catch (NumberFormatException e) { 150 logger.log(Level.WARNING, "Tried to blacklist invalid serial number " + value, e); 151 } 152 } 153 } 154 155 // whether that succeeds or fails, send it on its merry way 156 return Collections.unmodifiableSet(bl); 157 } 158 159 private static final Set<byte[]> readPublicKeyBlackList(String path) { 160 161 // start out with a base set of known bad values 162 Set<byte[]> bl = new HashSet<byte[]>(Arrays.asList( 163 // From http://src.chromium.org/viewvc/chrome/branches/782/src/net/base/x509_certificate.cc?r1=98750&r2=98749&pathrev=98750 164 // C=NL, O=DigiNotar, CN=DigiNotar Root CA/emailAddress=info@diginotar.nl 165 "410f36363258f30b347d12ce4863e433437806a8".getBytes(), 166 // Subject: CN=DigiNotar Cyber CA 167 // Issuer: CN=GTE CyberTrust Global Root 168 "ba3e7bd38cd7e1e6b9cd4c219962e59d7a2f4e37".getBytes(), 169 // Subject: CN=DigiNotar Services 1024 CA 170 // Issuer: CN=Entrust.net 171 "e23b8d105f87710a68d9248050ebefc627be4ca6".getBytes(), 172 // Subject: CN=DigiNotar PKIoverheid CA Organisatie - G2 173 // Issuer: CN=Staat der Nederlanden Organisatie CA - G2 174 "7b2e16bc39bcd72b456e9f055d1de615b74945db".getBytes(), 175 // Subject: CN=DigiNotar PKIoverheid CA Overheid en Bedrijven 176 // Issuer: CN=Staat der Nederlanden Overheid CA 177 "e8f91200c65cee16e039b9f883841661635f81c5".getBytes(), 178 // From http://src.chromium.org/viewvc/chrome?view=rev&revision=108479 179 // Subject: O=Digicert Sdn. Bhd. 180 // Issuer: CN=GTE CyberTrust Global Root 181 "0129bcd5b448ae8d2496d1c3e19723919088e152".getBytes(), 182 // Subject: CN=e-islem.kktcmerkezbankasi.org/emailAddress=ileti@kktcmerkezbankasi.org 183 // Issuer: CN=T\xC3\x9CRKTRUST Elektronik Sunucu Sertifikas\xC4\xB1 Hizmetleri 184 "5f3ab33d55007054bc5e3e5553cd8d8465d77c61".getBytes(), 185 // Subject: CN=*.EGO.GOV.TR 93 186 // Issuer: CN=T\xC3\x9CRKTRUST Elektronik Sunucu Sertifikas\xC4\xB1 Hizmetleri 187 "783333c9687df63377efceddd82efa9101913e8e".getBytes() 188 )); 189 190 // attempt to augment it with values taken from gservices 191 String pubkeyBlacklist = readBlacklist(path); 192 if (!pubkeyBlacklist.equals("")) { 193 for (String value : pubkeyBlacklist.split(",")) { 194 value = value.trim(); 195 if (isPubkeyHash(value)) { 196 bl.add(value.getBytes()); 197 } else { 198 logger.log(Level.WARNING, "Tried to blacklist invalid pubkey " + value); 199 } 200 } 201 } 202 203 return bl; 204 } 205 206 public boolean isPublicKeyBlackListed(PublicKey publicKey) { 207 byte[] encoded = publicKey.getEncoded(); 208 Digest digest = AndroidDigestFactory.getSHA1(); 209 digest.update(encoded, 0, encoded.length); 210 byte[] out = new byte[digest.getDigestSize()]; 211 digest.doFinal(out, 0); 212 for (byte[] blacklisted : pubkeyBlacklist) { 213 if (Arrays.equals(blacklisted, Hex.encode(out))) { 214 return true; 215 } 216 } 217 return false; 218 } 219 220 public boolean isSerialNumberBlackListed(BigInteger serial) { 221 return serialBlacklist.contains(serial); 222 } 223 224} 225