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| 1 | +/* | |
| 2 | + * Copyright (c) 2009, 2011, 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.security.AlgorithmConstraints; | |
| 29 | +import java.security.CryptoPrimitive; | |
| 30 | +import java.util.Collection; | |
| 31 | +import java.util.Collections; | |
| 32 | +import java.util.Set; | |
| 33 | +import java.util.EnumSet; | |
| 34 | +import java.util.HashSet; | |
| 35 | +import java.math.BigInteger; | |
| 36 | +import java.security.PublicKey; | |
| 37 | +import java.security.KeyFactory; | |
| 38 | +import java.security.AlgorithmParameters; | |
| 39 | +import java.security.NoSuchAlgorithmException; | |
| 40 | +import java.security.GeneralSecurityException; | |
| 41 | +import java.security.cert.Certificate; | |
| 42 | +import java.security.cert.X509CRL; | |
| 43 | +import java.security.cert.X509Certificate; | |
| 44 | +import java.security.cert.PKIXCertPathChecker; | |
| 45 | +import java.security.cert.TrustAnchor; | |
| 46 | +import java.security.cert.CRLException; | |
| 47 | +import java.security.cert.CertificateException; | |
| 48 | +import java.security.cert.CertPathValidatorException; | |
| 49 | +import java.security.cert.CertPathValidatorException.BasicReason; | |
| 50 | +import java.security.cert.PKIXReason; | |
| 51 | +import java.io.IOException; | |
| 52 | +import java.security.interfaces.*; | |
| 53 | +import java.security.spec.*; | |
| 54 | + | |
| 55 | +import sun.security.util.DisabledAlgorithmConstraints; | |
| 56 | +import sun.security.x509.X509CertImpl; | |
| 57 | +import sun.security.x509.X509CRLImpl; | |
| 58 | +import sun.security.x509.AlgorithmId; | |
| 59 | + | |
| 60 | +/** | |
| 61 | + * A <code>PKIXCertPathChecker</code> implementation to check whether a | |
| 62 | + * specified certificate contains the required algorithm constraints. | |
| 63 | + * <p> | |
| 64 | + * Certificate fields such as the subject public key, the signature | |
| 65 | + * algorithm, key usage, extended key usage, etc. need to conform to | |
| 66 | + * the specified algorithm constraints. | |
| 67 | + * | |
| 68 | + * @see PKIXCertPathChecker | |
| 69 | + * @see PKIXParameters | |
| 70 | + */ | |
| 71 | +final public class AlgorithmChecker extends PKIXCertPathChecker { | |
| 72 | + | |
| 73 | + private final AlgorithmConstraints constraints; | |
| 74 | + private final PublicKey trustedPubKey; | |
| 75 | + private PublicKey prevPubKey; | |
| 76 | + | |
| 77 | + private final static Set<CryptoPrimitive> SIGNATURE_PRIMITIVE_SET = | |
| 78 | + EnumSet.of(CryptoPrimitive.SIGNATURE); | |
| 79 | + | |
| 80 | + private final static DisabledAlgorithmConstraints | |
| 81 | + certPathDefaultConstraints = new DisabledAlgorithmConstraints( | |
| 82 | + DisabledAlgorithmConstraints.PROPERTY_CERTPATH_DISABLED_ALGS); | |
| 83 | + | |
| 84 | + /** | |
| 85 | + * Create a new <code>AlgorithmChecker</code> with the algorithm | |
| 86 | + * constraints specified in security property | |
| 87 | + * "jdk.certpath.disabledAlgorithms". | |
| 88 | + * | |
| 89 | + * @param anchor the trust anchor selected to validate the target | |
| 90 | + * certificate | |
| 91 | + */ | |
| 92 | + public AlgorithmChecker(TrustAnchor anchor) { | |
| 93 | + this(anchor, certPathDefaultConstraints); | |
| 94 | + } | |
| 95 | + | |
| 96 | + /** | |
| 97 | + * Create a new <code>AlgorithmChecker</code> with the | |
| 98 | + * given {@code AlgorithmConstraints}. | |
| 99 | + * <p> | |
| 100 | + * Note that this constructor will be used to check a certification | |
| 101 | + * path where the trust anchor is unknown, or a certificate list which may | |
| 102 | + * contain the trust anchor. This constructor is used by SunJSSE. | |
| 103 | + * | |
| 104 | + * @param constraints the algorithm constraints (or null) | |
| 105 | + */ | |
| 106 | + public AlgorithmChecker(AlgorithmConstraints constraints) { | |
| 107 | + this.prevPubKey = null; | |
| 108 | + this.trustedPubKey = null; | |
| 109 | + this.constraints = constraints; | |
| 110 | + } | |
| 111 | + | |
| 112 | + /** | |
| 113 | + * Create a new <code>AlgorithmChecker</code> with the | |
| 114 | + * given <code>TrustAnchor</code> and <code>AlgorithmConstraints</code>. | |
| 115 | + * | |
| 116 | + * @param anchor the trust anchor selected to validate the target | |
| 117 | + * certificate | |
| 118 | + * @param constraints the algorithm constraints (or null) | |
| 119 | + * | |
| 120 | + * @throws IllegalArgumentException if the <code>anchor</code> is null | |
| 121 | + */ | |
| 122 | + public AlgorithmChecker(TrustAnchor anchor, | |
| 123 | + AlgorithmConstraints constraints) { | |
| 124 | + | |
| 125 | + if (anchor == null) { | |
| 126 | + throw new IllegalArgumentException( | |
| 127 | + "The trust anchor cannot be null"); | |
| 128 | + } | |
| 129 | + | |
| 130 | + if (anchor.getTrustedCert() != null) { | |
| 131 | + this.trustedPubKey = anchor.getTrustedCert().getPublicKey(); | |
| 132 | + } else { | |
| 133 | + this.trustedPubKey = anchor.getCAPublicKey(); | |
| 134 | + } | |
| 135 | + | |
| 136 | + this.prevPubKey = trustedPubKey; | |
| 137 | + this.constraints = constraints; | |
| 138 | + } | |
| 139 | + | |
| 140 | + @Override | |
| 141 | + public void init(boolean forward) throws CertPathValidatorException { | |
| 142 | + // Note that this class does not support forward mode. | |
| 143 | + if (!forward) { | |
| 144 | + if (trustedPubKey != null) { | |
| 145 | + prevPubKey = trustedPubKey; | |
| 146 | + } else { | |
| 147 | + prevPubKey = null; | |
| 148 | + } | |
| 149 | + } else { | |
| 150 | + throw new | |
| 151 | + CertPathValidatorException("forward checking not supported"); | |
| 152 | + } | |
| 153 | + } | |
| 154 | + | |
| 155 | + @Override | |
| 156 | + public boolean isForwardCheckingSupported() { | |
| 157 | + // Note that as this class does not support forward mode, the method | |
| 158 | + // will always returns false. | |
| 159 | + return false; | |
| 160 | + } | |
| 161 | + | |
| 162 | + @Override | |
| 163 | + public Set<String> getSupportedExtensions() { | |
| 164 | + return null; | |
| 165 | + } | |
| 166 | + | |
| 167 | + @Override | |
| 168 | + public void check(Certificate cert, | |
| 169 | + Collection<String> unresolvedCritExts) | |
| 170 | + throws CertPathValidatorException { | |
| 171 | + | |
| 172 | + if (!(cert instanceof X509Certificate) || constraints == null) { | |
| 173 | + // ignore the check for non-x.509 certificate or null constraints | |
| 174 | + return; | |
| 175 | + } | |
| 176 | + | |
| 177 | + X509CertImpl x509Cert = null; | |
| 178 | + try { | |
| 179 | + x509Cert = X509CertImpl.toImpl((X509Certificate)cert); | |
| 180 | + } catch (CertificateException ce) { | |
| 181 | + throw new CertPathValidatorException(ce); | |
| 182 | + } | |
| 183 | + | |
| 184 | + PublicKey currPubKey = x509Cert.getPublicKey(); | |
| 185 | + String currSigAlg = x509Cert.getSigAlgName(); | |
| 186 | + | |
| 187 | + AlgorithmId algorithmId = null; | |
| 188 | + try { | |
| 189 | + algorithmId = (AlgorithmId)x509Cert.get(X509CertImpl.SIG_ALG); | |
| 190 | + } catch (CertificateException ce) { | |
| 191 | + throw new CertPathValidatorException(ce); | |
| 192 | + } | |
| 193 | + | |
| 194 | + AlgorithmParameters currSigAlgParams = algorithmId.getParameters(); | |
| 195 | + | |
| 196 | + // Check the current signature algorithm | |
| 197 | + if (!constraints.permits( | |
| 198 | + SIGNATURE_PRIMITIVE_SET, | |
| 199 | + currSigAlg, currSigAlgParams)) { | |
| 200 | + throw new CertPathValidatorException( | |
| 201 | + "Algorithm constraints check failed: " + currSigAlg, | |
| 202 | + null, null, -1, BasicReason.ALGORITHM_CONSTRAINED); | |
| 203 | + } | |
| 204 | + | |
| 205 | + // check the key usage and key size | |
| 206 | + boolean[] keyUsage = x509Cert.getKeyUsage(); | |
| 207 | + if (keyUsage != null && keyUsage.length < 9) { | |
| 208 | + throw new CertPathValidatorException( | |
| 209 | + "incorrect KeyUsage extension", | |
| 210 | + null, null, -1, PKIXReason.INVALID_KEY_USAGE); | |
| 211 | + } | |
| 212 | + | |
| 213 | + if (keyUsage != null) { | |
| 214 | + Set<CryptoPrimitive> primitives = | |
| 215 | + EnumSet.noneOf(CryptoPrimitive.class); | |
| 216 | + | |
| 217 | + if (keyUsage[0] || keyUsage[1] || keyUsage[5] || keyUsage[6]) { | |
| 218 | + // keyUsage[0]: KeyUsage.digitalSignature | |
| 219 | + // keyUsage[1]: KeyUsage.nonRepudiation | |
| 220 | + // keyUsage[5]: KeyUsage.keyCertSign | |
| 221 | + // keyUsage[6]: KeyUsage.cRLSign | |
| 222 | + primitives.add(CryptoPrimitive.SIGNATURE); | |
| 223 | + } | |
| 224 | + | |
| 225 | + if (keyUsage[2]) { // KeyUsage.keyEncipherment | |
| 226 | + primitives.add(CryptoPrimitive.KEY_ENCAPSULATION); | |
| 227 | + } | |
| 228 | + | |
| 229 | + if (keyUsage[3]) { // KeyUsage.dataEncipherment | |
| 230 | + primitives.add(CryptoPrimitive.PUBLIC_KEY_ENCRYPTION); | |
| 231 | + } | |
| 232 | + | |
| 233 | + if (keyUsage[4]) { // KeyUsage.keyAgreement | |
| 234 | + primitives.add(CryptoPrimitive.KEY_AGREEMENT); | |
| 235 | + } | |
| 236 | + | |
| 237 | + // KeyUsage.encipherOnly and KeyUsage.decipherOnly are | |
| 238 | + // undefined in the absence of the keyAgreement bit. | |
| 239 | + | |
| 240 | + if (!primitives.isEmpty()) { | |
| 241 | + if (!constraints.permits(primitives, currPubKey)) { | |
| 242 | + throw new CertPathValidatorException( | |
| 243 | + "algorithm constraints check failed", | |
| 244 | + null, null, -1, BasicReason.ALGORITHM_CONSTRAINED); | |
| 245 | + } | |
| 246 | + } | |
| 247 | + } | |
| 248 | + | |
| 249 | + // Check with previous cert for signature algorithm and public key | |
| 250 | + if (prevPubKey != null) { | |
| 251 | + if (currSigAlg != null) { | |
| 252 | + if (!constraints.permits( | |
| 253 | + SIGNATURE_PRIMITIVE_SET, | |
| 254 | + currSigAlg, prevPubKey, currSigAlgParams)) { | |
| 255 | + throw new CertPathValidatorException( | |
| 256 | + "Algorithm constraints check failed: " + currSigAlg, | |
| 257 | + null, null, -1, BasicReason.ALGORITHM_CONSTRAINED); | |
| 258 | + } | |
| 259 | + } | |
| 260 | + | |
| 261 | + // Inherit key parameters from previous key | |
| 262 | + if (currPubKey instanceof DSAPublicKey && | |
| 263 | + ((DSAPublicKey)currPubKey).getParams() == null) { | |
| 264 | + // Inherit DSA parameters from previous key | |
| 265 | + if (!(prevPubKey instanceof DSAPublicKey)) { | |
| 266 | + throw new CertPathValidatorException("Input key is not " + | |
| 267 | + "of a appropriate type for inheriting parameters"); | |
| 268 | + } | |
| 269 | + | |
| 270 | + DSAParams params = ((DSAPublicKey)prevPubKey).getParams(); | |
| 271 | + if (params == null) { | |
| 272 | + throw new CertPathValidatorException( | |
| 273 | + "Key parameters missing"); | |
| 274 | + } | |
| 275 | + | |
| 276 | + try { | |
| 277 | + BigInteger y = ((DSAPublicKey)currPubKey).getY(); | |
| 278 | + KeyFactory kf = KeyFactory.getInstance("DSA"); | |
| 279 | + DSAPublicKeySpec ks = new DSAPublicKeySpec(y, | |
| 280 | + params.getP(), | |
| 281 | + params.getQ(), | |
| 282 | + params.getG()); | |
| 283 | + currPubKey = kf.generatePublic(ks); | |
| 284 | + } catch (GeneralSecurityException e) { | |
| 285 | + throw new CertPathValidatorException("Unable to generate " + | |
| 286 | + "key with inherited parameters: " + e.getMessage(), e); | |
| 287 | + } | |
| 288 | + } | |
| 289 | + } | |
| 290 | + | |
| 291 | + // reset the previous public key | |
| 292 | + prevPubKey = currPubKey; | |
| 293 | + | |
| 294 | + // check the extended key usage, ignore the check now | |
| 295 | + // List<String> extendedKeyUsages = x509Cert.getExtendedKeyUsage(); | |
| 296 | + | |
| 297 | + // DO NOT remove any unresolved critical extensions | |
| 298 | + } | |
| 299 | + | |
| 300 | + /** | |
| 301 | + * Try to set the trust anchor of the checker. | |
| 302 | + * <p> | |
| 303 | + * If there is no trust anchor specified and the checker has not started, | |
| 304 | + * set the trust anchor. | |
| 305 | + * | |
| 306 | + * @param anchor the trust anchor selected to validate the target | |
| 307 | + * certificate | |
| 308 | + */ | |
| 309 | + void trySetTrustAnchor(TrustAnchor anchor) { | |
| 310 | + // Don't bother if the check has started or trust anchor has already | |
| 311 | + // specified. | |
| 312 | + if (prevPubKey == null) { | |
| 313 | + if (anchor == null) { | |
| 314 | + throw new IllegalArgumentException( | |
| 315 | + "The trust anchor cannot be null"); | |
| 316 | + } | |
| 317 | + | |
| 318 | + // Don't bother to change the trustedPubKey. | |
| 319 | + if (anchor.getTrustedCert() != null) { | |
| 320 | + prevPubKey = anchor.getTrustedCert().getPublicKey(); | |
| 321 | + } else { | |
| 322 | + prevPubKey = anchor.getCAPublicKey(); | |
| 323 | + } | |
| 324 | + } | |
| 325 | + } | |
| 326 | + | |
| 327 | + /** | |
| 328 | + * Check the signature algorithm with the specified public key. | |
| 329 | + * | |
| 330 | + * @param key the public key to verify the CRL signature | |
| 331 | + * @param crl the target CRL | |
| 332 | + */ | |
| 333 | + static void check(PublicKey key, X509CRL crl) | |
| 334 | + throws CertPathValidatorException { | |
| 335 | + | |
| 336 | + X509CRLImpl x509CRLImpl = null; | |
| 337 | + try { | |
| 338 | + x509CRLImpl = X509CRLImpl.toImpl(crl); | |
| 339 | + } catch (CRLException ce) { | |
| 340 | + throw new CertPathValidatorException(ce); | |
| 341 | + } | |
| 342 | + | |
| 343 | + AlgorithmId algorithmId = x509CRLImpl.getSigAlgId(); | |
| 344 | + check(key, algorithmId); | |
| 345 | + } | |
| 346 | + | |
| 347 | + /** | |
| 348 | + * Check the signature algorithm with the specified public key. | |
| 349 | + * | |
| 350 | + * @param key the public key to verify the CRL signature | |
| 351 | + * @param crl the target CRL | |
| 352 | + */ | |
| 353 | + static void check(PublicKey key, AlgorithmId algorithmId) | |
| 354 | + throws CertPathValidatorException { | |
| 355 | + String sigAlgName = algorithmId.getName(); | |
| 356 | + AlgorithmParameters sigAlgParams = algorithmId.getParameters(); | |
| 357 | + | |
| 358 | + if (!certPathDefaultConstraints.permits( | |
| 359 | + SIGNATURE_PRIMITIVE_SET, sigAlgName, key, sigAlgParams)) { | |
| 360 | + throw new CertPathValidatorException( | |
| 361 | + "algorithm check failed: " + sigAlgName + " is disabled", | |
| 362 | + null, null, -1, BasicReason.ALGORITHM_CONSTRAINED); | |
| 363 | + } | |
| 364 | + } | |
| 365 | + | |
| 366 | +} | |
| 367 | + | |