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| 1 | /* | ||
| 2 | * Copyright (c) 2000, 2008, 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 | |||
| 26 | package sun.security.provider.certpath; | ||
| 27 | |||
| 28 | import java.util.*; | ||
| 29 | import java.security.cert.*; | ||
| 30 | import java.security.cert.PKIXReason; | ||
| 31 | |||
| 32 | import sun.security.util.Debug; | ||
| 33 | import sun.security.x509.PKIXExtensions; | ||
| 34 | |||
| 35 | /** | ||
| 36 | * KeyChecker is a <code>PKIXCertPathChecker</code> that checks that the | ||
| 37 | * keyCertSign bit is set in the keyUsage extension in an intermediate CA | ||
| 38 | * certificate. It also checks whether the final certificate in a | ||
| 39 | * certification path meets the specified target constraints specified as | ||
| 40 | * a CertSelector in the PKIXParameters passed to the CertPathValidator. | ||
| 41 | * | ||
| 42 | * @since 1.4 | ||
| 43 | * @author Yassir Elley | ||
| 44 | */ | ||
| 45 | class KeyChecker extends PKIXCertPathChecker { | ||
| 46 | |||
| 47 | private static final Debug debug = Debug.getInstance("certpath"); | ||
| 48 | // the index of keyCertSign in the boolean KeyUsage array | ||
| 49 | private static final int keyCertSign = 5; | ||
| 50 | private final int certPathLen; | ||
| 51 | private CertSelector targetConstraints; | ||
| 52 | private int remainingCerts; | ||
| 53 | |||
| 54 | private Set<String> supportedExts; | ||
| 55 | |||
| 56 | /** | ||
| 57 | * Default Constructor | ||
| 58 | * | ||
| 59 | * @param certPathLen allowable cert path length | ||
| 60 | * @param targetCertSel a CertSelector object specifying the constraints | ||
| 61 | * on the target certificate | ||
| 62 | */ | ||
| 63 | KeyChecker(int certPathLen, CertSelector targetCertSel) | ||
| 64 | throws CertPathValidatorException | ||
| 65 | { | ||
| 66 | this.certPathLen = certPathLen; | ||
| 67 | this.targetConstraints = targetCertSel; | ||
| 68 | init(false); | ||
| 69 | } | ||
| 70 | |||
| 71 | /** | ||
| 72 | * Initializes the internal state of the checker from parameters | ||
| 73 | * specified in the constructor | ||
| 74 | */ | ||
| 75 | public void init(boolean forward) throws CertPathValidatorException { | ||
| 76 | if (!forward) { | ||
| 77 | remainingCerts = certPathLen; | ||
| 78 | } else { | ||
| 79 | throw new CertPathValidatorException | ||
| 80 | ("forward checking not supported"); | ||
| 81 | } | ||
| 82 | } | ||
| 83 | |||
| 84 | public final boolean isForwardCheckingSupported() { | ||
| 85 | return false; | ||
| 86 | } | ||
| 87 | |||
| 88 | public Set<String> getSupportedExtensions() { | ||
| 89 | if (supportedExts == null) { | ||
| 90 | supportedExts = new HashSet<String>(); | ||
| 91 | supportedExts.add(PKIXExtensions.KeyUsage_Id.toString()); | ||
| 92 | supportedExts.add(PKIXExtensions.ExtendedKeyUsage_Id.toString()); | ||
| 93 | supportedExts.add(PKIXExtensions.SubjectAlternativeName_Id.toString()); | ||
| 94 | supportedExts = Collections.unmodifiableSet(supportedExts); | ||
| 95 | } | ||
| 96 | return supportedExts; | ||
| 97 | } | ||
| 98 | |||
| 99 | /** | ||
| 100 | * Checks that keyUsage and target constraints are satisfied by | ||
| 101 | * the specified certificate. | ||
| 102 | * | ||
| 103 | * @param cert the Certificate | ||
| 104 | * @param unresolvedCritExts the unresolved critical extensions | ||
| 105 | * @exception CertPathValidatorException Exception thrown if certificate | ||
| 106 | * does not verify | ||
| 107 | */ | ||
| 108 | public void check(Certificate cert, Collection<String> unresCritExts) | ||
| 109 | throws CertPathValidatorException | ||
| 110 | { | ||
| 111 | X509Certificate currCert = (X509Certificate) cert; | ||
| 112 | |||
| 113 | remainingCerts--; | ||
| 114 | |||
| 115 | // if final certificate, check that target constraints are satisfied | ||
| 116 | if (remainingCerts == 0) { | ||
| 117 | if ((targetConstraints != null) && | ||
| 118 | (targetConstraints.match(currCert) == false)) { | ||
| 119 | throw new CertPathValidatorException("target certificate " + | ||
| 120 | "constraints check failed"); | ||
| 121 | } | ||
| 122 | } else { | ||
| 123 | // otherwise, verify that keyCertSign bit is set in CA certificate | ||
| 124 | verifyCAKeyUsage(currCert); | ||
| 125 | } | ||
| 126 | |||
| 127 | // remove the extensions that we have checked | ||
| 128 | if (unresCritExts != null && !unresCritExts.isEmpty()) { | ||
| 129 | unresCritExts.remove(PKIXExtensions.KeyUsage_Id.toString()); | ||
| 130 | unresCritExts.remove(PKIXExtensions.ExtendedKeyUsage_Id.toString()); | ||
| 131 | unresCritExts.remove( | ||
| 132 | PKIXExtensions.SubjectAlternativeName_Id.toString()); | ||
| 133 | } | ||
| 134 | } | ||
| 135 | |||
| 136 | /** | ||
| 137 | * Static method to verify that the key usage and extended key usage | ||
| 138 | * extension in a CA cert. The key usage extension, if present, must | ||
| 139 | * assert the keyCertSign bit. The extended key usage extension, if | ||
| 140 | * present, must include anyExtendedKeyUsage. | ||
| 141 | */ | ||
| 142 | static void verifyCAKeyUsage(X509Certificate cert) | ||
| 143 | throws CertPathValidatorException { | ||
| 144 | String msg = "CA key usage"; | ||
| 145 | if (debug != null) { | ||
| 146 | debug.println("KeyChecker.verifyCAKeyUsage() ---checking " + msg | ||
| 147 | + "..."); | ||
| 148 | } | ||
| 149 | |||
| 150 | boolean[] keyUsageBits = cert.getKeyUsage(); | ||
| 151 | |||
| 152 | // getKeyUsage returns null if the KeyUsage extension is not present | ||
| 153 | // in the certificate - in which case there is nothing to check | ||
| 154 | if (keyUsageBits == null) { | ||
| 155 | return; | ||
| 156 | } | ||
| 157 | |||
| 158 | // throw an exception if the keyCertSign bit is not set | ||
| 159 | if (!keyUsageBits[keyCertSign]) { | ||
| 160 | throw new CertPathValidatorException | ||
| 161 | (msg + " check failed: keyCertSign bit is not set", null, | ||
| 162 | null, -1, PKIXReason.INVALID_KEY_USAGE); | ||
| 163 | } | ||
| 164 | |||
| 165 | if (debug != null) { | ||
| 166 | debug.println("KeyChecker.verifyCAKeyUsage() " + msg | ||
| 167 | + " verified."); | ||
| 168 | } | ||
| 169 | } | ||
| 170 | } | ||