1 /*

     2  * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 package sun.security.util;

    26 

    27 import java.io.*;

    28 import java.security.AccessController;

    29 import java.security.MessageDigest;

    30 import java.security.NoSuchAlgorithmException;

    31 import java.security.PrivilegedAction;

    32 import java.security.cert.X509Certificate;

    33 import java.security.cert.CertificateException;

    34 import java.util.*;

    35 import sun.security.x509.X509CertImpl;

    36 

    37 /**

    38  * A utility class to check if a certificate is untrusted. This is an internal

    39  * mechanism that explicitly marks a certificate as untrusted, normally in the

    40  * case that a certificate is known to be used for malicious reasons.

    41  *

    42  * <b>Attention</b>: This check is NOT meant to replace the standard PKI-defined

    43  * validation check, neither is it used as an alternative to CRL.

    44  */

    45 public final class UntrustedCertificates {

    46 

    47     private static final Debug debug = Debug.getInstance("certpath");

    48     private static final String ALGORITHM_KEY = "Algorithm";

    49 

    50     private static final Properties props = new Properties();

    51     private static final String algorithm;

    52 

    53     static {

    54         AccessController.doPrivileged(new PrivilegedAction<Void>() {

    55             @Override

    56             public Void run() {

    57                 File f = new File(System.getProperty("java.home"),

    58                         "lib/security/blacklisted.certs");

    59                 try (FileInputStream fin = new FileInputStream(f)) {

    60                     props.load(fin);

    61                     // It's said that the fingerprint could contain colons

    62                     for (Map.Entry<Object,Object> e: props.entrySet()) {

    63                         e.setValue(stripColons(e.getValue()));

    64                     }

    65                 } catch (IOException fnfe) {

    66                     if (debug != null) {

    67                         debug.println("Error parsing blacklisted.certs");

    68                     }

    69                 }

    70                 return null;

    71             }

    72         });

    73         algorithm = props.getProperty(ALGORITHM_KEY);

    74     }

    75 

    76     private static String stripColons(Object input) {

    77         String s = (String)input;

    78         char[] letters = s.toCharArray();

    79         int pos = 0;

    80         for (int i = 0; i < letters.length; i++) {

    81             if (letters[i] != ':') {

    82                 if (i != pos) {

    83                     letters[pos] = letters[i];

    84                 }

    85                 pos++;

    86             }

    87         }

    88         if (pos == letters.length) return s;

    89         else return new String(letters, 0, pos);

    90     }

    91     /**

    92      * Checks if a certificate is untrusted.

    93      *

    94      * @param cert the certificate to check

    95      * @return true if the certificate is untrusted.

    96      */

    97     public static boolean isUntrusted(X509Certificate cert) {

    98         if (algorithm == null) {

    99             return false;

   100         }

   101         String key;

   102         if (cert instanceof X509CertImpl) {

   103             key = ((X509CertImpl)cert).getFingerprint(algorithm);

   104         } else {

   105             try {

   106                 key = new X509CertImpl(cert.getEncoded()).getFingerprint(algorithm);

   107             } catch (CertificateException cee) {

   108                 return false;

   109             }

   110         }

   111         return props.containsKey(key);

   112     }

   113 

   114     private UntrustedCertificates() {}

   115 }