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      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.FileNotFoundException;
     20 import java.io.IOException;
     21 import java.math.BigInteger;
     22 import java.security.PublicKey;
     23 import java.util.ArrayList;
     24 import java.util.Arrays;
     25 import java.util.Collections;
     26 import java.util.HashSet;
     27 import java.util.List;
     28 import java.util.Set;
     29 
     30 import libcore.io.IoUtils;
     31 import org.bouncycastle.crypto.Digest;
     32 import org.bouncycastle.crypto.digests.OpenSSLDigest;
     33 import org.bouncycastle.util.encoders.Hex;
     34 
     35 public class CertBlacklist {
     36 
     37     private static final String ANDROID_DATA = System.getenv("ANDROID_DATA");
     38     private static final String BLACKLIST_ROOT = ANDROID_DATA + "/misc/keychain/";
     39     public static final String DEFAULT_PUBKEY_BLACKLIST_PATH = BLACKLIST_ROOT + "pubkey_blacklist.txt";
     40     public static final String DEFAULT_SERIAL_BLACKLIST_PATH = BLACKLIST_ROOT + "serial_blacklist.txt";
     41 
     42     // public for testing
     43     public final Set<BigInteger> serialBlacklist;
     44     public final Set<byte[]> pubkeyBlacklist;
     45 
     46     public CertBlacklist() {
     47         this(DEFAULT_PUBKEY_BLACKLIST_PATH, DEFAULT_SERIAL_BLACKLIST_PATH);
     48     }
     49 
     50     /** Test only interface, not for public use */
     51     public CertBlacklist(String pubkeyBlacklistPath, String serialBlacklistPath) {
     52         serialBlacklist = readSerialBlackList(serialBlacklistPath);
     53         pubkeyBlacklist = readPublicKeyBlackList(pubkeyBlacklistPath);
     54     }
     55 
     56     private static boolean isHex(String value) {
     57         try {
     58             new BigInteger(value, 16);
     59             return true;
     60         } catch (NumberFormatException e) {
     61             System.logW("Could not parse hex value " + value, e);
     62             return false;
     63         }
     64     }
     65 
     66     private static boolean isPubkeyHash(String value) {
     67         if (value.length() != 40) {
     68             System.logW("Invalid pubkey hash length: " + value.length());
     69             return false;
     70          }
     71          return isHex(value);
     72     }
     73 
     74     private static String readBlacklist(String path) {
     75         try {
     76             return IoUtils.readFileAsString(path);
     77         } catch (FileNotFoundException ignored) {
     78         } catch (IOException e) {
     79             System.logW("Could not read blacklist", e);
     80         }
     81         return "";
     82     }
     83 
     84     private static final Set<BigInteger> readSerialBlackList(String path) {
     85 
     86         // start out with a base set of known bad values
     87         Set<BigInteger> bl = new HashSet<BigInteger>(Arrays.asList(
     88             // From http://src.chromium.org/viewvc/chrome/trunk/src/net/base/x509_certificate.cc?revision=78748&view=markup
     89             // Not a real certificate. For testing only.
     90             new BigInteger("077a59bcd53459601ca6907267a6dd1c", 16),
     91             new BigInteger("047ecbe9fca55f7bd09eae36e10cae1e", 16),
     92             new BigInteger("d8f35f4eb7872b2dab0692e315382fb0", 16),
     93             new BigInteger("b0b7133ed096f9b56fae91c874bd3ac0", 16),
     94             new BigInteger("9239d5348f40d1695a745470e1f23f43", 16),
     95             new BigInteger("e9028b9578e415dc1a710a2b88154447", 16),
     96             new BigInteger("d7558fdaf5f1105bb213282b707729a3", 16),
     97             new BigInteger("f5c86af36162f13a64f54f6dc9587c06", 16),
     98             new BigInteger("392a434f0e07df1f8aa305de34e0c229", 16),
     99             new BigInteger("3e75ced46b693021218830ae86a82a71", 16)
    100         ));
    101 
    102         // attempt to augment it with values taken from gservices
    103         String serialBlacklist = readBlacklist(path);
    104         if (!serialBlacklist.equals("")) {
    105             for(String value : serialBlacklist.split(",")) {
    106                 try {
    107                     bl.add(new BigInteger(value, 16));
    108                 } catch (NumberFormatException e) {
    109                     System.logW("Tried to blacklist invalid serial number " + value, e);
    110                 }
    111             }
    112         }
    113 
    114         // whether that succeeds or fails, send it on its merry way
    115         return Collections.unmodifiableSet(bl);
    116     }
    117 
    118     private static final Set<byte[]> readPublicKeyBlackList(String path) {
    119 
    120         // start out with a base set of known bad values
    121         Set<byte[]> bl = new HashSet<byte[]>(Arrays.asList(
    122             // From http://src.chromium.org/viewvc/chrome/branches/782/src/net/base/x509_certificate.cc?r1=98750&r2=98749&pathrev=98750
    123             // C=NL, O=DigiNotar, CN=DigiNotar Root CA/emailAddress=info (at) diginotar.nl
    124             "410f36363258f30b347d12ce4863e433437806a8".getBytes(),
    125             // Subject: CN=DigiNotar Cyber CA
    126             // Issuer: CN=GTE CyberTrust Global Root
    127             "ba3e7bd38cd7e1e6b9cd4c219962e59d7a2f4e37".getBytes(),
    128             // Subject: CN=DigiNotar Services 1024 CA
    129             // Issuer: CN=Entrust.net
    130             "e23b8d105f87710a68d9248050ebefc627be4ca6".getBytes(),
    131             // Subject: CN=DigiNotar PKIoverheid CA Organisatie - G2
    132             // Issuer: CN=Staat der Nederlanden Organisatie CA - G2
    133             "7b2e16bc39bcd72b456e9f055d1de615b74945db".getBytes(),
    134             // Subject: CN=DigiNotar PKIoverheid CA Overheid en Bedrijven
    135             // Issuer: CN=Staat der Nederlanden Overheid CA
    136             "e8f91200c65cee16e039b9f883841661635f81c5".getBytes(),
    137             // From http://src.chromium.org/viewvc/chrome?view=rev&revision=108479
    138             // Subject: O=Digicert Sdn. Bhd.
    139             // Issuer: CN=GTE CyberTrust Global Root
    140             "0129bcd5b448ae8d2496d1c3e19723919088e152".getBytes()
    141         ));
    142 
    143         // attempt to augment it with values taken from gservices
    144         String pubkeyBlacklist = readBlacklist(path);
    145         if (!pubkeyBlacklist.equals("")) {
    146             for (String value : pubkeyBlacklist.split(",")) {
    147                 value = value.trim();
    148                 if (isPubkeyHash(value)) {
    149                     bl.add(value.getBytes());
    150                 } else {
    151                     System.logW("Tried to blacklist invalid pubkey " + value);
    152                 }
    153             }
    154         }
    155 
    156         return bl;
    157     }
    158 
    159     public boolean isPublicKeyBlackListed(PublicKey publicKey) {
    160         byte[] encoded = publicKey.getEncoded();
    161         Digest digest = new OpenSSLDigest.SHA1();
    162         digest.update(encoded, 0, encoded.length);
    163         byte[] out = new byte[digest.getDigestSize()];
    164         digest.doFinal(out, 0);
    165         for (byte[] blacklisted : pubkeyBlacklist) {
    166             if (Arrays.equals(blacklisted, Hex.encode(out))) {
    167                 return true;
    168             }
    169         }
    170         return false;
    171     }
    172 
    173     public boolean isSerialNumberBlackListed(BigInteger serial) {
    174         return serialBlacklist.contains(serial);
    175     }
    176 
    177 }
    178