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 17 package org.bouncycastle.jce.provider; 18 19 import java.io.Closeable; 20 import java.io.ByteArrayOutputStream; 21 import java.io.FileNotFoundException; 22 import java.io.IOException; 23 import java.io.RandomAccessFile; 24 import java.math.BigInteger; 25 import java.security.PublicKey; 26 import java.util.Arrays; 27 import java.util.Collections; 28 import java.util.HashSet; 29 import java.util.Set; 30 import java.util.logging.Level; 31 import java.util.logging.Logger; 32 import org.bouncycastle.crypto.Digest; 33 import org.bouncycastle.crypto.digests.AndroidDigestFactory; 34 import org.bouncycastle.util.encoders.Hex; 35 36 public 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 CertBlacklist()49 public CertBlacklist() { 50 this(DEFAULT_PUBKEY_BLACKLIST_PATH, DEFAULT_SERIAL_BLACKLIST_PATH); 51 } 52 53 /** Test only interface, not for public use */ CertBlacklist(String pubkeyBlacklistPath, String serialBlacklistPath)54 public CertBlacklist(String pubkeyBlacklistPath, String serialBlacklistPath) { 55 serialBlacklist = readSerialBlackList(serialBlacklistPath); 56 pubkeyBlacklist = readPublicKeyBlackList(pubkeyBlacklistPath); 57 } 58 isHex(String value)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 isPubkeyHash(String value)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 readBlacklist(String path)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 readFileAsString(String path)88 private static String readFileAsString(String path) throws IOException { 89 return readFileAsBytes(path).toString("UTF-8"); 90 } 91 92 // Based on IoUtils.readFileAsBytes readFileAsBytes(String path)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 closeQuietly(Closeable closeable)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 readSerialBlackList(String path)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 new BigInteger("31da7", 16) 142 )); 143 144 // attempt to augment it with values taken from gservices 145 String serialBlacklist = readBlacklist(path); 146 if (!serialBlacklist.equals("")) { 147 for(String value : serialBlacklist.split(",")) { 148 try { 149 bl.add(new BigInteger(value, 16)); 150 } catch (NumberFormatException e) { 151 logger.log(Level.WARNING, "Tried to blacklist invalid serial number " + value, e); 152 } 153 } 154 } 155 156 // whether that succeeds or fails, send it on its merry way 157 return Collections.unmodifiableSet(bl); 158 } 159 readPublicKeyBlackList(String path)160 private static final Set<byte[]> readPublicKeyBlackList(String path) { 161 162 // start out with a base set of known bad values 163 Set<byte[]> bl = new HashSet<byte[]>(Arrays.asList( 164 // From http://src.chromium.org/viewvc/chrome/branches/782/src/net/base/x509_certificate.cc?r1=98750&r2=98749&pathrev=98750 165 // C=NL, O=DigiNotar, CN=DigiNotar Root CA/emailAddress=info@diginotar.nl 166 "410f36363258f30b347d12ce4863e433437806a8".getBytes(), 167 // Subject: CN=DigiNotar Cyber CA 168 // Issuer: CN=GTE CyberTrust Global Root 169 "ba3e7bd38cd7e1e6b9cd4c219962e59d7a2f4e37".getBytes(), 170 // Subject: CN=DigiNotar Services 1024 CA 171 // Issuer: CN=Entrust.net 172 "e23b8d105f87710a68d9248050ebefc627be4ca6".getBytes(), 173 // Subject: CN=DigiNotar PKIoverheid CA Organisatie - G2 174 // Issuer: CN=Staat der Nederlanden Organisatie CA - G2 175 "7b2e16bc39bcd72b456e9f055d1de615b74945db".getBytes(), 176 // Subject: CN=DigiNotar PKIoverheid CA Overheid en Bedrijven 177 // Issuer: CN=Staat der Nederlanden Overheid CA 178 "e8f91200c65cee16e039b9f883841661635f81c5".getBytes(), 179 // From http://src.chromium.org/viewvc/chrome?view=rev&revision=108479 180 // Subject: O=Digicert Sdn. Bhd. 181 // Issuer: CN=GTE CyberTrust Global Root 182 "0129bcd5b448ae8d2496d1c3e19723919088e152".getBytes(), 183 // Subject: CN=e-islem.kktcmerkezbankasi.org/emailAddress=ileti@kktcmerkezbankasi.org 184 // Issuer: CN=T\xC3\x9CRKTRUST Elektronik Sunucu Sertifikas\xC4\xB1 Hizmetleri 185 "5f3ab33d55007054bc5e3e5553cd8d8465d77c61".getBytes(), 186 // Subject: CN=*.EGO.GOV.TR 93 187 // Issuer: CN=T\xC3\x9CRKTRUST Elektronik Sunucu Sertifikas\xC4\xB1 Hizmetleri 188 "783333c9687df63377efceddd82efa9101913e8e".getBytes(), 189 // Subject: Subject: C=FR, O=DG Tr\xC3\xA9sor, CN=AC DG Tr\xC3\xA9sor SSL 190 // Issuer: C=FR, O=DGTPE, CN=AC DGTPE Signature Authentification 191 "3ecf4bbbe46096d514bb539bb913d77aa4ef31bf".getBytes() 192 )); 193 194 // attempt to augment it with values taken from gservices 195 String pubkeyBlacklist = readBlacklist(path); 196 if (!pubkeyBlacklist.equals("")) { 197 for (String value : pubkeyBlacklist.split(",")) { 198 value = value.trim(); 199 if (isPubkeyHash(value)) { 200 bl.add(value.getBytes()); 201 } else { 202 logger.log(Level.WARNING, "Tried to blacklist invalid pubkey " + value); 203 } 204 } 205 } 206 207 return bl; 208 } 209 isPublicKeyBlackListed(PublicKey publicKey)210 public boolean isPublicKeyBlackListed(PublicKey publicKey) { 211 byte[] encoded = publicKey.getEncoded(); 212 Digest digest = AndroidDigestFactory.getSHA1(); 213 digest.update(encoded, 0, encoded.length); 214 byte[] out = new byte[digest.getDigestSize()]; 215 digest.doFinal(out, 0); 216 for (byte[] blacklisted : pubkeyBlacklist) { 217 if (Arrays.equals(blacklisted, Hex.encode(out))) { 218 return true; 219 } 220 } 221 return false; 222 } 223 isSerialNumberBlackListed(BigInteger serial)224 public boolean isSerialNumberBlackListed(BigInteger serial) { 225 return serialBlacklist.contains(serial); 226 } 227 228 } 229