1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
|
/*
* 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 org.bouncycastle.jce.provider;
import java.io.Closeable;
import java.io.ByteArrayOutputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.math.BigInteger;
import java.security.PublicKey;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.bouncycastle.crypto.Digest;
import org.bouncycastle.crypto.digests.AndroidDigestFactory;
import org.bouncycastle.util.encoders.Hex;
public class CertBlacklist {
private static final Logger logger = Logger.getLogger(CertBlacklist.class.getName());
// public for testing
public final Set<BigInteger> serialBlacklist;
public final Set<byte[]> pubkeyBlacklist;
public CertBlacklist() {
String androidData = System.getenv("ANDROID_DATA");
String blacklistRoot = androidData + "/misc/keychain/";
String defaultPubkeyBlacklistPath = blacklistRoot + "pubkey_blacklist.txt";
String defaultSerialBlacklistPath = blacklistRoot + "serial_blacklist.txt";
pubkeyBlacklist = readPublicKeyBlackList(defaultPubkeyBlacklistPath);
serialBlacklist = readSerialBlackList(defaultSerialBlacklistPath);
}
/** Test only interface, not for public use */
public CertBlacklist(String pubkeyBlacklistPath, String serialBlacklistPath) {
pubkeyBlacklist = readPublicKeyBlackList(pubkeyBlacklistPath);
serialBlacklist = readSerialBlackList(serialBlacklistPath);
}
private static boolean isHex(String value) {
try {
new BigInteger(value, 16);
return true;
} catch (NumberFormatException e) {
logger.log(Level.WARNING, "Could not parse hex value " + value, e);
return false;
}
}
private static boolean isPubkeyHash(String value) {
if (value.length() != 40) {
logger.log(Level.WARNING, "Invalid pubkey hash length: " + value.length());
return false;
}
return isHex(value);
}
private static String readBlacklist(String path) {
try {
return readFileAsString(path);
} catch (FileNotFoundException ignored) {
} catch (IOException e) {
logger.log(Level.WARNING, "Could not read blacklist", e);
}
return "";
}
// From IoUtils.readFileAsString
private static String readFileAsString(String path) throws IOException {
return readFileAsBytes(path).toString("UTF-8");
}
// Based on IoUtils.readFileAsBytes
private static ByteArrayOutputStream readFileAsBytes(String path) throws IOException {
RandomAccessFile f = null;
try {
f = new RandomAccessFile(path, "r");
ByteArrayOutputStream bytes = new ByteArrayOutputStream((int) f.length());
byte[] buffer = new byte[8192];
while (true) {
int byteCount = f.read(buffer);
if (byteCount == -1) {
return bytes;
}
bytes.write(buffer, 0, byteCount);
}
} finally {
closeQuietly(f);
}
}
// Base on IoUtils.closeQuietly
private static void closeQuietly(Closeable closeable) {
if (closeable != null) {
try {
closeable.close();
} catch (RuntimeException rethrown) {
throw rethrown;
} catch (Exception ignored) {
}
}
}
private static final Set<BigInteger> readSerialBlackList(String path) {
// start out with a base set of known bad values
Set<BigInteger> bl = new HashSet<BigInteger>(Arrays.asList(
// From http://src.chromium.org/viewvc/chrome/trunk/src/net/base/x509_certificate.cc?revision=78748&view=markup
// Not a real certificate. For testing only.
new BigInteger("077a59bcd53459601ca6907267a6dd1c", 16),
new BigInteger("047ecbe9fca55f7bd09eae36e10cae1e", 16),
new BigInteger("d8f35f4eb7872b2dab0692e315382fb0", 16),
new BigInteger("b0b7133ed096f9b56fae91c874bd3ac0", 16),
new BigInteger("9239d5348f40d1695a745470e1f23f43", 16),
new BigInteger("e9028b9578e415dc1a710a2b88154447", 16),
new BigInteger("d7558fdaf5f1105bb213282b707729a3", 16),
new BigInteger("f5c86af36162f13a64f54f6dc9587c06", 16),
new BigInteger("392a434f0e07df1f8aa305de34e0c229", 16),
new BigInteger("3e75ced46b693021218830ae86a82a71", 16),
new BigInteger("864", 16),
new BigInteger("827", 16),
new BigInteger("31da7", 16)
));
// attempt to augment it with values taken from gservices
String serialBlacklist = readBlacklist(path);
if (!serialBlacklist.equals("")) {
for(String value : serialBlacklist.split(",")) {
try {
bl.add(new BigInteger(value, 16));
} catch (NumberFormatException e) {
logger.log(Level.WARNING, "Tried to blacklist invalid serial number " + value, e);
}
}
}
// whether that succeeds or fails, send it on its merry way
return Collections.unmodifiableSet(bl);
}
private static final Set<byte[]> readPublicKeyBlackList(String path) {
// start out with a base set of known bad values
Set<byte[]> bl = new HashSet<byte[]>(Arrays.asList(
// From http://src.chromium.org/viewvc/chrome/branches/782/src/net/base/x509_certificate.cc?r1=98750&r2=98749&pathrev=98750
// C=NL, O=DigiNotar, CN=DigiNotar Root CA/emailAddress=info@diginotar.nl
"410f36363258f30b347d12ce4863e433437806a8".getBytes(),
// Subject: CN=DigiNotar Cyber CA
// Issuer: CN=GTE CyberTrust Global Root
"ba3e7bd38cd7e1e6b9cd4c219962e59d7a2f4e37".getBytes(),
// Subject: CN=DigiNotar Services 1024 CA
// Issuer: CN=Entrust.net
"e23b8d105f87710a68d9248050ebefc627be4ca6".getBytes(),
// Subject: CN=DigiNotar PKIoverheid CA Organisatie - G2
// Issuer: CN=Staat der Nederlanden Organisatie CA - G2
"7b2e16bc39bcd72b456e9f055d1de615b74945db".getBytes(),
// Subject: CN=DigiNotar PKIoverheid CA Overheid en Bedrijven
// Issuer: CN=Staat der Nederlanden Overheid CA
"e8f91200c65cee16e039b9f883841661635f81c5".getBytes(),
// From http://src.chromium.org/viewvc/chrome?view=rev&revision=108479
// Subject: O=Digicert Sdn. Bhd.
// Issuer: CN=GTE CyberTrust Global Root
"0129bcd5b448ae8d2496d1c3e19723919088e152".getBytes(),
// Subject: CN=e-islem.kktcmerkezbankasi.org/emailAddress=ileti@kktcmerkezbankasi.org
// Issuer: CN=T\xC3\x9CRKTRUST Elektronik Sunucu Sertifikas\xC4\xB1 Hizmetleri
"5f3ab33d55007054bc5e3e5553cd8d8465d77c61".getBytes(),
// Subject: CN=*.EGO.GOV.TR 93
// Issuer: CN=T\xC3\x9CRKTRUST Elektronik Sunucu Sertifikas\xC4\xB1 Hizmetleri
"783333c9687df63377efceddd82efa9101913e8e".getBytes(),
// Subject: Subject: C=FR, O=DG Tr\xC3\xA9sor, CN=AC DG Tr\xC3\xA9sor SSL
// Issuer: C=FR, O=DGTPE, CN=AC DGTPE Signature Authentification
"3ecf4bbbe46096d514bb539bb913d77aa4ef31bf".getBytes()
));
// attempt to augment it with values taken from gservices
String pubkeyBlacklist = readBlacklist(path);
if (!pubkeyBlacklist.equals("")) {
for (String value : pubkeyBlacklist.split(",")) {
value = value.trim();
if (isPubkeyHash(value)) {
bl.add(value.getBytes());
} else {
logger.log(Level.WARNING, "Tried to blacklist invalid pubkey " + value);
}
}
}
return bl;
}
public boolean isPublicKeyBlackListed(PublicKey publicKey) {
byte[] encoded = publicKey.getEncoded();
Digest digest = AndroidDigestFactory.getSHA1();
digest.update(encoded, 0, encoded.length);
byte[] out = new byte[digest.getDigestSize()];
digest.doFinal(out, 0);
for (byte[] blacklisted : pubkeyBlacklist) {
if (Arrays.equals(blacklisted, Hex.encode(out))) {
return true;
}
}
return false;
}
public boolean isSerialNumberBlackListed(BigInteger serial) {
return serialBlacklist.contains(serial);
}
}
|
