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| 1 | +/* | |
| 2 | + * Copyright (c) 2000, 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.io.IOException; | |
| 29 | +import java.security.AccessController; | |
| 30 | +import java.security.InvalidAlgorithmParameterException; | |
| 31 | +import java.security.cert.CertPath; | |
| 32 | +import java.security.cert.CertPathParameters; | |
| 33 | +import java.security.cert.CertPathValidatorException; | |
| 34 | +import java.security.cert.CertPathValidatorSpi; | |
| 35 | +import java.security.cert.CertPathValidatorResult; | |
| 36 | +import java.security.cert.PKIXCertPathChecker; | |
| 37 | +import java.security.cert.PKIXCertPathValidatorResult; | |
| 38 | +import java.security.cert.PKIXParameters; | |
| 39 | +import java.security.cert.PKIXReason; | |
| 40 | +import java.security.cert.PolicyNode; | |
| 41 | +import java.security.cert.TrustAnchor; | |
| 42 | +import java.security.cert.X509Certificate; | |
| 43 | +import java.security.cert.X509CertSelector; | |
| 44 | +import java.util.Collections; | |
| 45 | +import java.util.List; | |
| 46 | +import java.util.ArrayList; | |
| 47 | +import java.util.Date; | |
| 48 | +import java.util.Set; | |
| 49 | +import javax.security.auth.x500.X500Principal; | |
| 50 | +import sun.security.action.GetBooleanSecurityPropertyAction; | |
| 51 | +import sun.security.util.Debug; | |
| 52 | + | |
| 53 | +import sun.security.x509.X509CertImpl; | |
| 54 | + | |
| 55 | + | |
| 56 | +/** | |
| 57 | + * This class implements the PKIX validation algorithm for certification | |
| 58 | + * paths consisting exclusively of <code>X509Certificates</code>. It uses | |
| 59 | + * the specified input parameter set (which must be a | |
| 60 | + * <code>PKIXParameters</code> object) and signature provider (if any). | |
| 61 | + * | |
| 62 | + * @since 1.4 | |
| 63 | + * @author Yassir Elley | |
| 64 | + */ | |
| 65 | +public class PKIXCertPathValidator extends CertPathValidatorSpi { | |
| 66 | + | |
| 67 | + private static final Debug debug = Debug.getInstance("certpath"); | |
| 68 | + private Date testDate; | |
| 69 | + private List<PKIXCertPathChecker> userCheckers; | |
| 70 | + private String sigProvider; | |
| 71 | + private BasicChecker basicChecker; | |
| 72 | + private boolean ocspEnabled = false; | |
| 73 | + private boolean onlyEECert = false; | |
| 74 | + | |
| 75 | + /** | |
| 76 | + * Default constructor. | |
| 77 | + */ | |
| 78 | + public PKIXCertPathValidator() {} | |
| 79 | + | |
| 80 | + /** | |
| 81 | + * Validates a certification path consisting exclusively of | |
| 82 | + * <code>X509Certificate</code>s using the PKIX validation algorithm, | |
| 83 | + * which uses the specified input parameter set. | |
| 84 | + * The input parameter set must be a <code>PKIXParameters</code> object. | |
| 85 | + * | |
| 86 | + * @param cp the X509 certification path | |
| 87 | + * @param param the input PKIX parameter set | |
| 88 | + * @return the result | |
| 89 | + * @exception CertPathValidatorException Exception thrown if cert path | |
| 90 | + * does not validate. | |
| 91 | + * @exception InvalidAlgorithmParameterException if the specified | |
| 92 | + * parameters are inappropriate for this certification path validator | |
| 93 | + */ | |
| 94 | + public CertPathValidatorResult engineValidate(CertPath cp, | |
| 95 | + CertPathParameters param) | |
| 96 | + throws CertPathValidatorException, InvalidAlgorithmParameterException | |
| 97 | + { | |
| 98 | + if (debug != null) | |
| 99 | + debug.println("PKIXCertPathValidator.engineValidate()..."); | |
| 100 | + | |
| 101 | + if (!(param instanceof PKIXParameters)) { | |
| 102 | + throw new InvalidAlgorithmParameterException("inappropriate " | |
| 103 | + + "parameters, must be an instance of PKIXParameters"); | |
| 104 | + } | |
| 105 | + | |
| 106 | + if (!cp.getType().equals("X.509") && !cp.getType().equals("X509")) { | |
| 107 | + throw new InvalidAlgorithmParameterException("inappropriate " | |
| 108 | + + "certification path type specified, must be X.509 or X509"); | |
| 109 | + } | |
| 110 | + | |
| 111 | + PKIXParameters pkixParam = (PKIXParameters) param; | |
| 112 | + | |
| 113 | + // Make sure that none of the trust anchors include name constraints | |
| 114 | + // (not supported). | |
| 115 | + Set<TrustAnchor> anchors = pkixParam.getTrustAnchors(); | |
| 116 | + for (TrustAnchor anchor : anchors) { | |
| 117 | + if (anchor.getNameConstraints() != null) { | |
| 118 | + throw new InvalidAlgorithmParameterException | |
| 119 | + ("name constraints in trust anchor not supported"); | |
| 120 | + } | |
| 121 | + } | |
| 122 | + | |
| 123 | + // the certpath which has been passed in (cp) | |
| 124 | + // has the target cert as the first certificate - we | |
| 125 | + // need to keep this cp so we can return it | |
| 126 | + // in case of an exception and for policy qualifier | |
| 127 | + // processing - however, for certpath validation, | |
| 128 | + // we need to create a reversed path, where we reverse the | |
| 129 | + // ordering so that the target cert is the last certificate | |
| 130 | + | |
| 131 | + // Must copy elements of certList into a new modifiable List before | |
| 132 | + // calling Collections.reverse(). | |
| 133 | + ArrayList<X509Certificate> certList = new ArrayList<X509Certificate> | |
| 134 | + ((List<X509Certificate>)cp.getCertificates()); | |
| 135 | + if (debug != null) { | |
| 136 | + if (certList.isEmpty()) { | |
| 137 | + debug.println("PKIXCertPathValidator.engineValidate() " | |
| 138 | + + "certList is empty"); | |
| 139 | + } | |
| 140 | + debug.println("PKIXCertPathValidator.engineValidate() " | |
| 141 | + + "reversing certpath..."); | |
| 142 | + } | |
| 143 | + Collections.reverse(certList); | |
| 144 | + | |
| 145 | + // now certList has the target cert as the last cert and we | |
| 146 | + // can proceed with normal validation | |
| 147 | + | |
| 148 | + populateVariables(pkixParam); | |
| 149 | + | |
| 150 | + // Retrieve the first certificate in the certpath | |
| 151 | + // (to be used later in pre-screening) | |
| 152 | + X509Certificate firstCert = null; | |
| 153 | + if (!certList.isEmpty()) { | |
| 154 | + firstCert = certList.get(0); | |
| 155 | + } | |
| 156 | + | |
| 157 | + CertPathValidatorException lastException = null; | |
| 158 | + | |
| 159 | + // We iterate through the set of trust anchors until we find | |
| 160 | + // one that works at which time we stop iterating | |
| 161 | + for (TrustAnchor anchor : anchors) { | |
| 162 | + X509Certificate trustedCert = anchor.getTrustedCert(); | |
| 163 | + if (trustedCert != null) { | |
| 164 | + if (debug != null) { | |
| 165 | + debug.println("PKIXCertPathValidator.engineValidate() " | |
| 166 | + + "anchor.getTrustedCert() != null"); | |
| 167 | + } | |
| 168 | + | |
| 169 | + // if this trust anchor is not worth trying, | |
| 170 | + // we move on to the next one | |
| 171 | + if (!isWorthTrying(trustedCert, firstCert)) { | |
| 172 | + continue; | |
| 173 | + } | |
| 174 | + | |
| 175 | + if (debug != null) { | |
| 176 | + debug.println("anchor.getTrustedCert()." | |
| 177 | + + "getSubjectX500Principal() = " | |
| 178 | + + trustedCert.getSubjectX500Principal()); | |
| 179 | + } | |
| 180 | + } else { | |
| 181 | + if (debug != null) { | |
| 182 | + debug.println("PKIXCertPathValidator.engineValidate(): " | |
| 183 | + + "anchor.getTrustedCert() == null"); | |
| 184 | + } | |
| 185 | + } | |
| 186 | + | |
| 187 | + try { | |
| 188 | + PolicyNodeImpl rootNode = new PolicyNodeImpl(null, | |
| 189 | + PolicyChecker.ANY_POLICY, null, false, | |
| 190 | + Collections.singleton(PolicyChecker.ANY_POLICY), false); | |
| 191 | + PolicyNode policyTree = | |
| 192 | + doValidate(anchor, cp, certList, pkixParam, rootNode); | |
| 193 | + // if this anchor works, return success | |
| 194 | + return new PKIXCertPathValidatorResult(anchor, policyTree, | |
| 195 | + basicChecker.getPublicKey()); | |
| 196 | + } catch (CertPathValidatorException cpe) { | |
| 197 | + // remember this exception | |
| 198 | + lastException = cpe; | |
| 199 | + } | |
| 200 | + } | |
| 201 | + | |
| 202 | + // could not find a trust anchor that verified | |
| 203 | + // (a) if we did a validation and it failed, use that exception | |
| 204 | + if (lastException != null) { | |
| 205 | + throw lastException; | |
| 206 | + } | |
| 207 | + // (b) otherwise, generate new exception | |
| 208 | + throw new CertPathValidatorException | |
| 209 | + ("Path does not chain with any of the trust anchors", | |
| 210 | + null, null, -1, PKIXReason.NO_TRUST_ANCHOR); | |
| 211 | + } | |
| 212 | + | |
| 213 | + /** | |
| 214 | + * Internal method to do some simple checks to see if a given cert is | |
| 215 | + * worth trying to validate in the chain. | |
| 216 | + */ | |
| 217 | + private boolean isWorthTrying(X509Certificate trustedCert, | |
| 218 | + X509Certificate firstCert) { | |
| 219 | + | |
| 220 | + boolean worthy = false; | |
| 221 | + | |
| 222 | + if (debug != null) { | |
| 223 | + debug.println("PKIXCertPathValidator.isWorthTrying() checking " | |
| 224 | + + "if this trusted cert is worth trying ..."); | |
| 225 | + } | |
| 226 | + | |
| 227 | + if (firstCert == null) { | |
| 228 | + return true; | |
| 229 | + } | |
| 230 | + | |
| 231 | + AdaptableX509CertSelector issuerSelector = | |
| 232 | + new AdaptableX509CertSelector(); | |
| 233 | + | |
| 234 | + // check trusted certificate's subject | |
| 235 | + issuerSelector.setSubject(firstCert.getIssuerX500Principal()); | |
| 236 | + | |
| 237 | + // check the validity period | |
| 238 | + issuerSelector.setValidityPeriod(firstCert.getNotBefore(), | |
| 239 | + firstCert.getNotAfter()); | |
| 240 | + | |
| 241 | + /* | |
| 242 | + * Facilitate certification path construction with authority | |
| 243 | + * key identifier and subject key identifier. | |
| 244 | + */ | |
| 245 | + try { | |
| 246 | + X509CertImpl firstCertImpl = X509CertImpl.toImpl(firstCert); | |
| 247 | + issuerSelector.parseAuthorityKeyIdentifierExtension( | |
| 248 | + firstCertImpl.getAuthorityKeyIdentifierExtension()); | |
| 249 | + | |
| 250 | + worthy = issuerSelector.match(trustedCert); | |
| 251 | + } catch (Exception e) { | |
| 252 | + // It is not worth trying. | |
| 253 | + } | |
| 254 | + | |
| 255 | + if (debug != null) { | |
| 256 | + if (worthy) { | |
| 257 | + debug.println("YES - try this trustedCert"); | |
| 258 | + } else { | |
| 259 | + debug.println("NO - don't try this trustedCert"); | |
| 260 | + } | |
| 261 | + } | |
| 262 | + | |
| 263 | + return worthy; | |
| 264 | + } | |
| 265 | + | |
| 266 | + /** | |
| 267 | + * Internal method to setup the internal state | |
| 268 | + */ | |
| 269 | + private void populateVariables(PKIXParameters pkixParam) | |
| 270 | + { | |
| 271 | + // default value for testDate is current time | |
| 272 | + testDate = pkixParam.getDate(); | |
| 273 | + if (testDate == null) { | |
| 274 | + testDate = new Date(System.currentTimeMillis()); | |
| 275 | + } | |
| 276 | + | |
| 277 | + userCheckers = pkixParam.getCertPathCheckers(); | |
| 278 | + sigProvider = pkixParam.getSigProvider(); | |
| 279 | + | |
| 280 | + if (pkixParam.isRevocationEnabled()) { | |
| 281 | + // Examine OCSP security property | |
| 282 | + ocspEnabled = AccessController.doPrivileged( | |
| 283 | + new GetBooleanSecurityPropertyAction | |
| 284 | + (OCSPChecker.OCSP_ENABLE_PROP)); | |
| 285 | + onlyEECert = AccessController.doPrivileged( | |
| 286 | + new GetBooleanSecurityPropertyAction | |
| 287 | + ("com.sun.security.onlyCheckRevocationOfEECert")); | |
| 288 | + } | |
| 289 | + } | |
| 290 | + | |
| 291 | + /** | |
| 292 | + * Internal method to actually validate a constructed path. | |
| 293 | + * | |
| 294 | + * @return the valid policy tree | |
| 295 | + */ | |
| 296 | + private PolicyNode doValidate( | |
| 297 | + TrustAnchor anchor, CertPath cpOriginal, | |
| 298 | + ArrayList<X509Certificate> certList, PKIXParameters pkixParam, | |
| 299 | + PolicyNodeImpl rootNode) throws CertPathValidatorException | |
| 300 | + { | |
| 301 | + int certPathLen = certList.size(); | |
| 302 | + | |
| 303 | + basicChecker = new BasicChecker(anchor, testDate, sigProvider, false); | |
| 304 | + AlgorithmChecker algorithmChecker = new AlgorithmChecker(anchor); | |
| 305 | + KeyChecker keyChecker = new KeyChecker(certPathLen, | |
| 306 | + pkixParam.getTargetCertConstraints()); | |
| 307 | + ConstraintsChecker constraintsChecker = | |
| 308 | + new ConstraintsChecker(certPathLen); | |
| 309 | + | |
| 310 | + PolicyChecker policyChecker = | |
| 311 | + new PolicyChecker(pkixParam.getInitialPolicies(), certPathLen, | |
| 312 | + pkixParam.isExplicitPolicyRequired(), | |
| 313 | + pkixParam.isPolicyMappingInhibited(), | |
| 314 | + pkixParam.isAnyPolicyInhibited(), | |
| 315 | + pkixParam.getPolicyQualifiersRejected(), | |
| 316 | + rootNode); | |
| 317 | + | |
| 318 | + ArrayList<PKIXCertPathChecker> certPathCheckers = | |
| 319 | + new ArrayList<PKIXCertPathChecker>(); | |
| 320 | + // add standard checkers that we will be using | |
| 321 | + certPathCheckers.add(algorithmChecker); | |
| 322 | + certPathCheckers.add(keyChecker); | |
| 323 | + certPathCheckers.add(constraintsChecker); | |
| 324 | + certPathCheckers.add(policyChecker); | |
| 325 | + certPathCheckers.add(basicChecker); | |
| 326 | + | |
| 327 | + // only add a revocationChecker if revocation is enabled | |
| 328 | + if (pkixParam.isRevocationEnabled()) { | |
| 329 | + | |
| 330 | + // Use OCSP if it has been enabled | |
| 331 | + if (ocspEnabled) { | |
| 332 | + OCSPChecker ocspChecker = | |
| 333 | + new OCSPChecker(cpOriginal, pkixParam, onlyEECert); | |
| 334 | + certPathCheckers.add(ocspChecker); | |
| 335 | + } | |
| 336 | + | |
| 337 | + // Always use CRLs | |
| 338 | + CrlRevocationChecker revocationChecker = new | |
| 339 | + CrlRevocationChecker(anchor, pkixParam, certList, onlyEECert); | |
| 340 | + certPathCheckers.add(revocationChecker); | |
| 341 | + } | |
| 342 | + | |
| 343 | + // add user-specified checkers | |
| 344 | + certPathCheckers.addAll(userCheckers); | |
| 345 | + | |
| 346 | + PKIXMasterCertPathValidator masterValidator = | |
| 347 | + new PKIXMasterCertPathValidator(certPathCheckers); | |
| 348 | + | |
| 349 | + masterValidator.validate(cpOriginal, certList); | |
| 350 | + | |
| 351 | + return policyChecker.getPolicyTree(); | |
| 352 | + } | |
| 353 | +} | |