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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.math.BigInteger; | |
| 29 | +import java.util.Collection; | |
| 30 | +import java.util.Date; | |
| 31 | +import java.util.Set; | |
| 32 | +import java.security.GeneralSecurityException; | |
| 33 | +import java.security.KeyFactory; | |
| 34 | +import java.security.PublicKey; | |
| 35 | +import java.security.SignatureException; | |
| 36 | +import java.security.cert.Certificate; | |
| 37 | +import java.security.cert.CertificateExpiredException; | |
| 38 | +import java.security.cert.CertificateNotYetValidException; | |
| 39 | +import java.security.cert.CertPathValidatorException; | |
| 40 | +import java.security.cert.CertPathValidatorException.BasicReason; | |
| 41 | +import java.security.cert.X509Certificate; | |
| 42 | +import java.security.cert.PKIXCertPathChecker; | |
| 43 | +import java.security.cert.PKIXReason; | |
| 44 | +import java.security.cert.TrustAnchor; | |
| 45 | +import java.security.interfaces.DSAParams; | |
| 46 | +import java.security.interfaces.DSAPublicKey; | |
| 47 | +import java.security.spec.DSAPublicKeySpec; | |
| 48 | +import javax.security.auth.x500.X500Principal; | |
| 49 | +import sun.security.x509.X500Name; | |
| 50 | +import sun.security.util.Debug; | |
| 51 | + | |
| 52 | +/** | |
| 53 | + * BasicChecker is a PKIXCertPathChecker that checks the basic information | |
| 54 | + * on a PKIX certificate, namely the signature, timestamp, and subject/issuer | |
| 55 | + * name chaining. | |
| 56 | + * | |
| 57 | + * @since 1.4 | |
| 58 | + * @author Yassir Elley | |
| 59 | + */ | |
| 60 | +class BasicChecker extends PKIXCertPathChecker { | |
| 61 | + | |
| 62 | + private static final Debug debug = Debug.getInstance("certpath"); | |
| 63 | + private final PublicKey trustedPubKey; | |
| 64 | + private final X500Principal caName; | |
| 65 | + private final Date testDate; | |
| 66 | + private final String sigProvider; | |
| 67 | + private final boolean sigOnly; | |
| 68 | + private X500Principal prevSubject; | |
| 69 | + private PublicKey prevPubKey; | |
| 70 | + | |
| 71 | + /** | |
| 72 | + * Constructor that initializes the input parameters. | |
| 73 | + * | |
| 74 | + * @param anchor the anchor selected to validate the target certificate | |
| 75 | + * @param testDate the time for which the validity of the certificate | |
| 76 | + * should be determined | |
| 77 | + * @param sigProvider the name of the signature provider | |
| 78 | + * @param sigOnly true if only signature checking is to be done; | |
| 79 | + * if false, all checks are done | |
| 80 | + */ | |
| 81 | + BasicChecker(TrustAnchor anchor, Date testDate, String sigProvider, | |
| 82 | + boolean sigOnly) throws CertPathValidatorException | |
| 83 | + { | |
| 84 | + if (anchor.getTrustedCert() != null) { | |
| 85 | + this.trustedPubKey = anchor.getTrustedCert().getPublicKey(); | |
| 86 | + this.caName = anchor.getTrustedCert().getSubjectX500Principal(); | |
| 87 | + } else { | |
| 88 | + this.trustedPubKey = anchor.getCAPublicKey(); | |
| 89 | + this.caName = anchor.getCA(); | |
| 90 | + } | |
| 91 | + this.testDate = testDate; | |
| 92 | + this.sigProvider = sigProvider; | |
| 93 | + this.sigOnly = sigOnly; | |
| 94 | + init(false); | |
| 95 | + } | |
| 96 | + | |
| 97 | + /** | |
| 98 | + * Initializes the internal state of the checker from parameters | |
| 99 | + * specified in the constructor. | |
| 100 | + */ | |
| 101 | + public void init(boolean forward) throws CertPathValidatorException { | |
| 102 | + if (!forward) { | |
| 103 | + prevPubKey = trustedPubKey; | |
| 104 | + prevSubject = caName; | |
| 105 | + } else { | |
| 106 | + throw new | |
| 107 | + CertPathValidatorException("forward checking not supported"); | |
| 108 | + } | |
| 109 | + } | |
| 110 | + | |
| 111 | + public boolean isForwardCheckingSupported() { | |
| 112 | + return false; | |
| 113 | + } | |
| 114 | + | |
| 115 | + public Set<String> getSupportedExtensions() { | |
| 116 | + return null; | |
| 117 | + } | |
| 118 | + | |
| 119 | + /** | |
| 120 | + * Performs the signature, timestamp, and subject/issuer name chaining | |
| 121 | + * checks on the certificate using its internal state. This method does | |
| 122 | + * not remove any critical extensions from the Collection. | |
| 123 | + * | |
| 124 | + * @param cert the Certificate | |
| 125 | + * @param unresolvedCritExts a Collection of the unresolved critical | |
| 126 | + * extensions | |
| 127 | + * @exception CertPathValidatorException Exception thrown if certificate | |
| 128 | + * does not verify. | |
| 129 | + */ | |
| 130 | + public void check(Certificate cert, Collection<String> unresolvedCritExts) | |
| 131 | + throws CertPathValidatorException | |
| 132 | + { | |
| 133 | + X509Certificate currCert = (X509Certificate) cert; | |
| 134 | + | |
| 135 | + if (!sigOnly) { | |
| 136 | + verifyTimestamp(currCert, testDate); | |
| 137 | + verifyNameChaining(currCert, prevSubject); | |
| 138 | + } | |
| 139 | + verifySignature(currCert, prevPubKey, sigProvider); | |
| 140 | + | |
| 141 | + updateState(currCert); | |
| 142 | + } | |
| 143 | + | |
| 144 | + /** | |
| 145 | + * Verifies the signature on the certificate using the previous public key | |
| 146 | + * @param cert the Certificate | |
| 147 | + * @param prevPubKey the previous PublicKey | |
| 148 | + * @param sigProvider a String containing the signature provider | |
| 149 | + * @exception CertPathValidatorException Exception thrown if certificate | |
| 150 | + * does not verify. | |
| 151 | + */ | |
| 152 | + private void verifySignature(X509Certificate cert, PublicKey prevPubKey, | |
| 153 | + String sigProvider) throws CertPathValidatorException | |
| 154 | + { | |
| 155 | + String msg = "signature"; | |
| 156 | + if (debug != null) | |
| 157 | + debug.println("---checking " + msg + "..."); | |
| 158 | + | |
| 159 | + try { | |
| 160 | + cert.verify(prevPubKey, sigProvider); | |
| 161 | + } catch (SignatureException e) { | |
| 162 | + throw new CertPathValidatorException | |
| 163 | + (msg + " check failed", e, null, -1, | |
| 164 | + BasicReason.INVALID_SIGNATURE); | |
| 165 | + } catch (Exception e) { | |
| 166 | + throw new CertPathValidatorException(msg + " check failed", e); | |
| 167 | + } | |
| 168 | + | |
| 169 | + if (debug != null) | |
| 170 | + debug.println(msg + " verified."); | |
| 171 | + } | |
| 172 | + | |
| 173 | + /** | |
| 174 | + * Internal method to verify the timestamp on a certificate | |
| 175 | + */ | |
| 176 | + private void verifyTimestamp(X509Certificate cert, Date date) | |
| 177 | + throws CertPathValidatorException | |
| 178 | + { | |
| 179 | + String msg = "timestamp"; | |
| 180 | + if (debug != null) | |
| 181 | + debug.println("---checking " + msg + ":" + date.toString() + "..."); | |
| 182 | + | |
| 183 | + try { | |
| 184 | + cert.checkValidity(date); | |
| 185 | + } catch (CertificateExpiredException e) { | |
| 186 | + throw new CertPathValidatorException | |
| 187 | + (msg + " check failed", e, null, -1, BasicReason.EXPIRED); | |
| 188 | + } catch (CertificateNotYetValidException e) { | |
| 189 | + throw new CertPathValidatorException | |
| 190 | + (msg + " check failed", e, null, -1, BasicReason.NOT_YET_VALID); | |
| 191 | + } | |
| 192 | + | |
| 193 | + if (debug != null) | |
| 194 | + debug.println(msg + " verified."); | |
| 195 | + } | |
| 196 | + | |
| 197 | + /** | |
| 198 | + * Internal method to check that cert has a valid DN to be next in a chain | |
| 199 | + */ | |
| 200 | + private void verifyNameChaining(X509Certificate cert, | |
| 201 | + X500Principal prevSubject) throws CertPathValidatorException | |
| 202 | + { | |
| 203 | + if (prevSubject != null) { | |
| 204 | + | |
| 205 | + String msg = "subject/issuer name chaining"; | |
| 206 | + if (debug != null) | |
| 207 | + debug.println("---checking " + msg + "..."); | |
| 208 | + | |
| 209 | + X500Principal currIssuer = cert.getIssuerX500Principal(); | |
| 210 | + // reject null or empty issuer DNs | |
| 211 | + | |
| 212 | + if (X500Name.asX500Name(currIssuer).isEmpty()) { | |
| 213 | + throw new CertPathValidatorException | |
| 214 | + (msg + " check failed: " + | |
| 215 | + "empty/null issuer DN in certificate is invalid", null, | |
| 216 | + null, -1, PKIXReason.NAME_CHAINING); | |
| 217 | + } | |
| 218 | + | |
| 219 | + if (!(currIssuer.equals(prevSubject))) { | |
| 220 | + throw new CertPathValidatorException | |
| 221 | + (msg + " check failed", null, null, -1, | |
| 222 | + PKIXReason.NAME_CHAINING); | |
| 223 | + } | |
| 224 | + | |
| 225 | + if (debug != null) | |
| 226 | + debug.println(msg + " verified."); | |
| 227 | + } | |
| 228 | + } | |
| 229 | + | |
| 230 | + /** | |
| 231 | + * Internal method to manage state information at each iteration | |
| 232 | + */ | |
| 233 | + private void updateState(X509Certificate currCert) | |
| 234 | + throws CertPathValidatorException | |
| 235 | + { | |
| 236 | + PublicKey cKey = currCert.getPublicKey(); | |
| 237 | + if (debug != null) { | |
| 238 | + debug.println("BasicChecker.updateState issuer: " + | |
| 239 | + currCert.getIssuerX500Principal().toString() + "; subject: " + | |
| 240 | + currCert.getSubjectX500Principal() + "; serial#: " + | |
| 241 | + currCert.getSerialNumber().toString()); | |
| 242 | + } | |
| 243 | + if (cKey instanceof DSAPublicKey && | |
| 244 | + ((DSAPublicKey)cKey).getParams() == null) { | |
| 245 | + //cKey needs to inherit DSA parameters from prev key | |
| 246 | + cKey = makeInheritedParamsKey(cKey, prevPubKey); | |
| 247 | + if (debug != null) debug.println("BasicChecker.updateState Made " + | |
| 248 | + "key with inherited params"); | |
| 249 | + } | |
| 250 | + prevPubKey = cKey; | |
| 251 | + prevSubject = currCert.getSubjectX500Principal(); | |
| 252 | + } | |
| 253 | + | |
| 254 | + /** | |
| 255 | + * Internal method to create a new key with inherited key parameters | |
| 256 | + * | |
| 257 | + * @param keyValueKey key from which to obtain key value | |
| 258 | + * @param keyParamsKey key from which to obtain key parameters | |
| 259 | + * @return new public key having value and parameters | |
| 260 | + * @throws CertPathValidatorException if keys are not appropriate types | |
| 261 | + * for this operation | |
| 262 | + */ | |
| 263 | + static PublicKey makeInheritedParamsKey(PublicKey keyValueKey, | |
| 264 | + PublicKey keyParamsKey) throws CertPathValidatorException | |
| 265 | + { | |
| 266 | + PublicKey usableKey; | |
| 267 | + if (!(keyValueKey instanceof DSAPublicKey) || | |
| 268 | + !(keyParamsKey instanceof DSAPublicKey)) | |
| 269 | + throw new CertPathValidatorException("Input key is not " + | |
| 270 | + "appropriate type for " + | |
| 271 | + "inheriting parameters"); | |
| 272 | + DSAParams params = ((DSAPublicKey)keyParamsKey).getParams(); | |
| 273 | + if (params == null) | |
| 274 | + throw new CertPathValidatorException("Key parameters missing"); | |
| 275 | + try { | |
| 276 | + BigInteger y = ((DSAPublicKey)keyValueKey).getY(); | |
| 277 | + KeyFactory kf = KeyFactory.getInstance("DSA"); | |
| 278 | + DSAPublicKeySpec ks = new DSAPublicKeySpec(y, | |
| 279 | + params.getP(), | |
| 280 | + params.getQ(), | |
| 281 | + params.getG()); | |
| 282 | + usableKey = kf.generatePublic(ks); | |
| 283 | + } catch (GeneralSecurityException e) { | |
| 284 | + throw new CertPathValidatorException("Unable to generate key with" + | |
| 285 | + " inherited parameters: " + | |
| 286 | + e.getMessage(), e); | |
| 287 | + } | |
| 288 | + return usableKey; | |
| 289 | + } | |
| 290 | + | |
| 291 | + /** | |
| 292 | + * return the public key associated with the last certificate processed | |
| 293 | + * | |
| 294 | + * @return PublicKey the last public key processed | |
| 295 | + */ | |
| 296 | + PublicKey getPublicKey() { | |
| 297 | + return prevPubKey; | |
| 298 | + } | |
| 299 | +} | |