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| 1 | /* | ||
| 2 | * Copyright (c) 2002, 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.*; | ||
| 29 | import java.net.URI; | ||
| 30 | import java.util.*; | ||
| 31 | import java.security.*; | ||
| 32 | import java.security.cert.*; | ||
| 33 | import javax.security.auth.x500.X500Principal; | ||
| 34 | |||
| 35 | import sun.security.action.GetBooleanAction; | ||
| 36 | import sun.security.util.Debug; | ||
| 37 | import sun.security.util.DerOutputStream; | ||
| 38 | import sun.security.x509.*; | ||
| 39 | |||
| 40 | /** | ||
| 41 | * Class to obtain CRLs via the CRLDistributionPoints extension. | ||
| 42 | * Note that the functionality of this class must be explicitly enabled | ||
| 43 | * via a system property, see the USE_CRLDP variable below. | ||
| 44 | * | ||
| 45 | * This class uses the URICertStore class to fetch CRLs. The URICertStore | ||
| 46 | * class also implements CRL caching: see the class description for more | ||
| 47 | * information. | ||
| 48 | * | ||
| 49 | * @author Andreas Sterbenz | ||
| 50 | * @author Sean Mullan | ||
| 51 | * @since 1.4.2 | ||
| 52 | */ | ||
| 53 | class DistributionPointFetcher { | ||
| 54 | |||
| 55 | private static final Debug debug = Debug.getInstance("certpath"); | ||
| 56 | |||
| 57 | private static final boolean[] ALL_REASONS = | ||
| 58 | {true, true, true, true, true, true, true, true, true}; | ||
| 59 | |||
| 60 | /** | ||
| 61 | * Flag indicating whether support for the CRL distribution point | ||
| 62 | * extension shall be enabled. Currently disabled by default for | ||
| 63 | * compatibility and legal reasons. | ||
| 64 | */ | ||
| 65 | private final static boolean USE_CRLDP = AccessController.doPrivileged | ||
| 66 | (new GetBooleanAction("com.sun.security.enableCRLDP")); | ||
| 67 | |||
| 68 | // singleton instance | ||
| 69 | private static final DistributionPointFetcher INSTANCE = | ||
| 70 | new DistributionPointFetcher(); | ||
| 71 | |||
| 72 | /** | ||
| 73 | * Private instantiation only. | ||
| 74 | */ | ||
| 75 | private DistributionPointFetcher() {} | ||
| 76 | |||
| 77 | /** | ||
| 78 | * Return a DistributionPointFetcher instance. | ||
| 79 | */ | ||
| 80 | static DistributionPointFetcher getInstance() { | ||
| 81 | return INSTANCE; | ||
| 82 | } | ||
| 83 | |||
| 84 | /** | ||
| 85 | * Return the X509CRLs matching this selector. The selector must be | ||
| 86 | * an X509CRLSelector with certificateChecking set. | ||
| 87 | * | ||
| 88 | * If CRLDP support is disabled, this method always returns an | ||
| 89 | * empty set. | ||
| 90 | */ | ||
| 91 | Collection<X509CRL> getCRLs(X509CRLSelector selector, boolean signFlag, | ||
| 92 | PublicKey prevKey, String provider, List<CertStore> certStores, | ||
| 93 | boolean[] reasonsMask, Set<TrustAnchor> trustAnchors, | ||
| 94 | Date validity) throws CertStoreException { | ||
| 95 | |||
| 96 | if (USE_CRLDP == false) { | ||
| 97 | return Collections.emptySet(); | ||
| 98 | } | ||
| 99 | X509Certificate cert = selector.getCertificateChecking(); | ||
| 100 | if (cert == null) { | ||
| 101 | return Collections.emptySet(); | ||
| 102 | } | ||
| 103 | try { | ||
| 104 | X509CertImpl certImpl = X509CertImpl.toImpl(cert); | ||
| 105 | if (debug != null) { | ||
| 106 | debug.println("DistributionPointFetcher.getCRLs: Checking " | ||
| 107 | + "CRLDPs for " + certImpl.getSubjectX500Principal()); | ||
| 108 | } | ||
| 109 | CRLDistributionPointsExtension ext = | ||
| 110 | certImpl.getCRLDistributionPointsExtension(); | ||
| 111 | if (ext == null) { | ||
| 112 | if (debug != null) { | ||
| 113 | debug.println("No CRLDP ext"); | ||
| 114 | } | ||
| 115 | return Collections.emptySet(); | ||
| 116 | } | ||
| 117 | List<DistributionPoint> points = (List<DistributionPoint>)ext.get( | ||
| 118 | CRLDistributionPointsExtension.POINTS); | ||
| 119 | Set<X509CRL> results = new HashSet<X509CRL>(); | ||
| 120 | for (Iterator<DistributionPoint> t = points.iterator(); | ||
| 121 | t.hasNext() && !Arrays.equals(reasonsMask, ALL_REASONS); ) { | ||
| 122 | DistributionPoint point = t.next(); | ||
| 123 | Collection<X509CRL> crls = getCRLs(selector, certImpl, | ||
| 124 | point, reasonsMask, signFlag, prevKey, provider, | ||
| 125 | certStores, trustAnchors, validity); | ||
| 126 | results.addAll(crls); | ||
| 127 | } | ||
| 128 | if (debug != null) { | ||
| 129 | debug.println("Returning " + results.size() + " CRLs"); | ||
| 130 | } | ||
| 131 | return results; | ||
| 132 | } catch (CertificateException e) { | ||
| 133 | return Collections.emptySet(); | ||
| 134 | } catch (IOException e) { | ||
| 135 | return Collections.emptySet(); | ||
| 136 | } | ||
| 137 | } | ||
| 138 | |||
| 139 | /** | ||
| 140 | * Download CRLs from the given distribution point, verify and return them. | ||
| 141 | * See the top of the class for current limitations. | ||
| 142 | */ | ||
| 143 | private Collection<X509CRL> getCRLs(X509CRLSelector selector, | ||
| 144 | X509CertImpl certImpl, DistributionPoint point, boolean[] reasonsMask, | ||
| 145 | boolean signFlag, PublicKey prevKey, String provider, | ||
| 146 | List<CertStore> certStores, Set<TrustAnchor> trustAnchors, | ||
| 147 | Date validity) { | ||
| 148 | |||
| 149 | // check for full name | ||
| 150 | GeneralNames fullName = point.getFullName(); | ||
| 151 | if (fullName == null) { | ||
| 152 | // check for relative name | ||
| 153 | RDN relativeName = point.getRelativeName(); | ||
| 154 | if (relativeName == null) { | ||
| 155 | return Collections.emptySet(); | ||
| 156 | } | ||
| 157 | try { | ||
| 158 | GeneralNames crlIssuers = point.getCRLIssuer(); | ||
| 159 | if (crlIssuers == null) { | ||
| 160 | fullName = getFullNames | ||
| 161 | ((X500Name) certImpl.getIssuerDN(), relativeName); | ||
| 162 | } else { | ||
| 163 | // should only be one CRL Issuer | ||
| 164 | if (crlIssuers.size() != 1) { | ||
| 165 | return Collections.emptySet(); | ||
| 166 | } else { | ||
| 167 | fullName = getFullNames | ||
| 168 | ((X500Name) crlIssuers.get(0).getName(), relativeName); | ||
| 169 | } | ||
| 170 | } | ||
| 171 | } catch (IOException ioe) { | ||
| 172 | return Collections.emptySet(); | ||
| 173 | } | ||
| 174 | } | ||
| 175 | Collection<X509CRL> possibleCRLs = new ArrayList<X509CRL>(); | ||
| 176 | Collection<X509CRL> crls = new ArrayList<X509CRL>(2); | ||
| 177 | for (Iterator<GeneralName> t = fullName.iterator(); t.hasNext(); ) { | ||
| 178 | GeneralName name = t.next(); | ||
| 179 | if (name.getType() == GeneralNameInterface.NAME_DIRECTORY) { | ||
| 180 | X500Name x500Name = (X500Name) name.getName(); | ||
| 181 | possibleCRLs.addAll( | ||
| 182 | getCRLs(x500Name, certImpl.getIssuerX500Principal(), | ||
| 183 | certStores)); | ||
| 184 | } else if (name.getType() == GeneralNameInterface.NAME_URI) { | ||
| 185 | URIName uriName = (URIName)name.getName(); | ||
| 186 | X509CRL crl = getCRL(uriName); | ||
| 187 | if (crl != null) { | ||
| 188 | possibleCRLs.add(crl); | ||
| 189 | } | ||
| 190 | } | ||
| 191 | } | ||
| 192 | |||
| 193 | for (X509CRL crl : possibleCRLs) { | ||
| 194 | try { | ||
| 195 | // make sure issuer is not set | ||
| 196 | // we check the issuer in verifyCRLs method | ||
| 197 | selector.setIssuerNames(null); | ||
| 198 | if (selector.match(crl) && verifyCRL(certImpl, point, crl, | ||
| 199 | reasonsMask, signFlag, prevKey, provider, trustAnchors, | ||
| 200 | certStores, validity)) { | ||
| 201 | crls.add(crl); | ||
| 202 | } | ||
| 203 | } catch (Exception e) { | ||
| 204 | // don't add the CRL | ||
| 205 | if (debug != null) { | ||
| 206 | debug.println("Exception verifying CRL: " + e.getMessage()); | ||
| 207 | e.printStackTrace(); | ||
| 208 | } | ||
| 209 | } | ||
| 210 | } | ||
| 211 | return crls; | ||
| 212 | } | ||
| 213 | |||
| 214 | /** | ||
| 215 | * Download CRL from given URI. | ||
| 216 | */ | ||
| 217 | private X509CRL getCRL(URIName name) { | ||
| 218 | URI uri = name.getURI(); | ||
| 219 | if (debug != null) { | ||
| 220 | debug.println("Trying to fetch CRL from DP " + uri); | ||
| 221 | } | ||
| 222 | try { | ||
| 223 | CertStore ucs = URICertStore.getInstance | ||
| 224 | (new URICertStore.URICertStoreParameters(uri)); | ||
| 225 | Collection<? extends CRL> crls = ucs.getCRLs(null); | ||
| 226 | if (crls.isEmpty()) { | ||
| 227 | return null; | ||
| 228 | } else { | ||
| 229 | return (X509CRL) crls.iterator().next(); | ||
| 230 | } | ||
| 231 | } catch (Exception e) { | ||
| 232 | if (debug != null) { | ||
| 233 | debug.println("Exception getting CRL from CertStore: " + e); | ||
| 234 | e.printStackTrace(); | ||
| 235 | } | ||
| 236 | } | ||
| 237 | return null; | ||
| 238 | } | ||
| 239 | |||
| 240 | /** | ||
| 241 | * Fetch CRLs from certStores. | ||
| 242 | */ | ||
| 243 | private Collection<X509CRL> getCRLs(X500Name name, | ||
| 244 | X500Principal certIssuer, List<CertStore> certStores) | ||
| 245 | { | ||
| 246 | if (debug != null) { | ||
| 247 | debug.println("Trying to fetch CRL from DP " + name); | ||
| 248 | } | ||
| 249 | X509CRLSelector xcs = new X509CRLSelector(); | ||
| 250 | xcs.addIssuer(name.asX500Principal()); | ||
| 251 | xcs.addIssuer(certIssuer); | ||
| 252 | Collection<X509CRL> crls = new ArrayList<X509CRL>(); | ||
| 253 | for (CertStore store : certStores) { | ||
| 254 | try { | ||
| 255 | for (CRL crl : store.getCRLs(xcs)) { | ||
| 256 | crls.add((X509CRL)crl); | ||
| 257 | } | ||
| 258 | } catch (CertStoreException cse) { | ||
| 259 | // don't add the CRL | ||
| 260 | if (debug != null) { | ||
| 261 | debug.println("Non-fatal exception while retrieving " + | ||
| 262 | "CRLs: " + cse); | ||
| 263 | cse.printStackTrace(); | ||
| 264 | } | ||
| 265 | } | ||
| 266 | } | ||
| 267 | return crls; | ||
| 268 | } | ||
| 269 | |||
| 270 | /** | ||
| 271 | * Verifies a CRL for the given certificate's Distribution Point to | ||
| 272 | * ensure it is appropriate for checking the revocation status. | ||
| 273 | * | ||
| 274 | * @param certImpl the certificate whose revocation status is being checked | ||
| 275 | * @param point one of the distribution points of the certificate | ||
| 276 | * @param crl the CRL | ||
| 277 | * @param reasonsMask the interim reasons mask | ||
| 278 | * @param signFlag true if prevKey can be used to verify the CRL | ||
| 279 | * @param prevKey the public key that verifies the certificate's signature | ||
| 280 | * @param provider the Signature provider to use | ||
| 281 | * @param trustAnchors a {@code Set} of {@code TrustAnchor}s | ||
| 282 | * @param certStores a {@code List} of {@code CertStore}s to be used in | ||
| 283 | * finding certificates and CRLs | ||
| 284 | * @param validity the time for which the validity of the CRL issuer's | ||
| 285 | * certification path should be determined | ||
| 286 | * @return true if ok, false if not | ||
| 287 | */ | ||
| 288 | boolean verifyCRL(X509CertImpl certImpl, DistributionPoint point, | ||
| 289 | X509CRL crl, boolean[] reasonsMask, boolean signFlag, | ||
| 290 | PublicKey prevKey, String provider, | ||
| 291 | Set<TrustAnchor> trustAnchors, List<CertStore> certStores, | ||
| 292 | Date validity) throws CRLException, IOException { | ||
| 293 | |||
| 294 | boolean indirectCRL = false; | ||
| 295 | X509CRLImpl crlImpl = X509CRLImpl.toImpl(crl); | ||
| 296 | IssuingDistributionPointExtension idpExt = | ||
| 297 | crlImpl.getIssuingDistributionPointExtension(); | ||
| 298 | X500Name certIssuer = (X500Name) certImpl.getIssuerDN(); | ||
| 299 | X500Name crlIssuer = (X500Name) crlImpl.getIssuerDN(); | ||
| 300 | |||
| 301 | // if crlIssuer is set, verify that it matches the issuer of the | ||
| 302 | // CRL and the CRL contains an IDP extension with the indirectCRL | ||
| 303 | // boolean asserted. Otherwise, verify that the CRL issuer matches the | ||
| 304 | // certificate issuer. | ||
| 305 | GeneralNames pointCrlIssuers = point.getCRLIssuer(); | ||
| 306 | X500Name pointCrlIssuer = null; | ||
| 307 | if (pointCrlIssuers != null) { | ||
| 308 | if (idpExt == null || | ||
| 309 | ((Boolean) idpExt.get | ||
| 310 | (IssuingDistributionPointExtension.INDIRECT_CRL)).equals | ||
| 311 | (Boolean.FALSE)) { | ||
| 312 | return false; | ||
| 313 | } | ||
| 314 | boolean match = false; | ||
| 315 | for (Iterator<GeneralName> t = pointCrlIssuers.iterator(); | ||
| 316 | !match && t.hasNext(); ) { | ||
| 317 | GeneralNameInterface name = t.next().getName(); | ||
| 318 | if (crlIssuer.equals(name) == true) { | ||
| 319 | pointCrlIssuer = (X500Name) name; | ||
| 320 | match = true; | ||
| 321 | } | ||
| 322 | } | ||
| 323 | if (match == false) { | ||
| 324 | return false; | ||
| 325 | } | ||
| 326 | |||
| 327 | // we accept the case that a CRL issuer provide status | ||
| 328 | // information for itself. | ||
| 329 | if (issues(certImpl, crlImpl, provider)) { | ||
| 330 | // reset the public key used to verify the CRL's signature | ||
| 331 | prevKey = certImpl.getPublicKey(); | ||
| 332 | } else { | ||
| 333 | indirectCRL = true; | ||
| 334 | } | ||
| 335 | } else if (crlIssuer.equals(certIssuer) == false) { | ||
| 336 | if (debug != null) { | ||
| 337 | debug.println("crl issuer does not equal cert issuer"); | ||
| 338 | } | ||
| 339 | return false; | ||
| 340 | } else { | ||
| 341 | // in case of self-issued indirect CRL issuer. | ||
| 342 | byte[] certAKID = certImpl.getExtensionValue( | ||
| 343 | PKIXExtensions.AuthorityKey_Id.toString()); | ||
| 344 | byte[] crlAKID = crlImpl.getExtensionValue( | ||
| 345 | PKIXExtensions.AuthorityKey_Id.toString()); | ||
| 346 | |||
| 347 | if (certAKID == null || crlAKID == null) { | ||
| 348 | // cannot recognize indirect CRL without AKID | ||
| 349 | |||
| 350 | // we accept the case that a CRL issuer provide status | ||
| 351 | // information for itself. | ||
| 352 | if (issues(certImpl, crlImpl, provider)) { | ||
| 353 | // reset the public key used to verify the CRL's signature | ||
| 354 | prevKey = certImpl.getPublicKey(); | ||
| 355 | } | ||
| 356 | } else if (!Arrays.equals(certAKID, crlAKID)) { | ||
| 357 | // we accept the case that a CRL issuer provide status | ||
| 358 | // information for itself. | ||
| 359 | if (issues(certImpl, crlImpl, provider)) { | ||
| 360 | // reset the public key used to verify the CRL's signature | ||
| 361 | prevKey = certImpl.getPublicKey(); | ||
| 362 | } else { | ||
| 363 | indirectCRL = true; | ||
| 364 | } | ||
| 365 | } | ||
| 366 | } | ||
| 367 | |||
| 368 | if (!indirectCRL && !signFlag) { | ||
| 369 | // cert's key cannot be used to verify the CRL | ||
| 370 | return false; | ||
| 371 | } | ||
| 372 | |||
| 373 | if (idpExt != null) { | ||
| 374 | DistributionPointName idpPoint = (DistributionPointName) | ||
| 375 | idpExt.get(IssuingDistributionPointExtension.POINT); | ||
| 376 | if (idpPoint != null) { | ||
| 377 | GeneralNames idpNames = idpPoint.getFullName(); | ||
| 378 | if (idpNames == null) { | ||
| 379 | RDN relativeName = idpPoint.getRelativeName(); | ||
| 380 | if (relativeName == null) { | ||
| 381 | if (debug != null) { | ||
| 382 | debug.println("IDP must be relative or full DN"); | ||
| 383 | } | ||
| 384 | return false; | ||
| 385 | } | ||
| 386 | if (debug != null) { | ||
| 387 | debug.println("IDP relativeName:" + relativeName); | ||
| 388 | } | ||
| 389 | idpNames = getFullNames(crlIssuer, relativeName); | ||
| 390 | } | ||
| 391 | // if the DP name is present in the IDP CRL extension and the | ||
| 392 | // DP field is present in the DP, then verify that one of the | ||
| 393 | // names in the IDP matches one of the names in the DP | ||
| 394 | if (point.getFullName() != null || | ||
| 395 | point.getRelativeName() != null) { | ||
| 396 | GeneralNames pointNames = point.getFullName(); | ||
| 397 | if (pointNames == null) { | ||
| 398 | RDN relativeName = point.getRelativeName(); | ||
| 399 | if (relativeName == null) { | ||
| 400 | if (debug != null) { | ||
| 401 | debug.println("DP must be relative or full DN"); | ||
| 402 | } | ||
| 403 | return false; | ||
| 404 | } | ||
| 405 | if (debug != null) { | ||
| 406 | debug.println("DP relativeName:" + relativeName); | ||
| 407 | } | ||
| 408 | if (indirectCRL) { | ||
| 409 | if (pointCrlIssuers.size() != 1) { | ||
| 410 | // RFC 3280: there must be only 1 CRL issuer | ||
| 411 | // name when relativeName is present | ||
| 412 | if (debug != null) { | ||
| 413 | debug.println("must only be one CRL " + | ||
| 414 | "issuer when relative name present"); | ||
| 415 | } | ||
| 416 | return false; | ||
| 417 | } | ||
| 418 | pointNames = getFullNames | ||
| 419 | (pointCrlIssuer, relativeName); | ||
| 420 | } else { | ||
| 421 | pointNames = getFullNames(certIssuer, relativeName); | ||
| 422 | } | ||
| 423 | } | ||
| 424 | boolean match = false; | ||
| 425 | for (Iterator<GeneralName> i = idpNames.iterator(); | ||
| 426 | !match && i.hasNext(); ) { | ||
| 427 | GeneralNameInterface idpName = i.next().getName(); | ||
| 428 | if (debug != null) { | ||
| 429 | debug.println("idpName: " + idpName); | ||
| 430 | } | ||
| 431 | for (Iterator<GeneralName> p = pointNames.iterator(); | ||
| 432 | !match && p.hasNext(); ) { | ||
| 433 | GeneralNameInterface pointName = p.next().getName(); | ||
| 434 | if (debug != null) { | ||
| 435 | debug.println("pointName: " + pointName); | ||
| 436 | } | ||
| 437 | match = idpName.equals(pointName); | ||
| 438 | } | ||
| 439 | } | ||
| 440 | if (!match) { | ||
| 441 | if (debug != null) { | ||
| 442 | debug.println("IDP name does not match DP name"); | ||
| 443 | } | ||
| 444 | return false; | ||
| 445 | } | ||
| 446 | // if the DP name is present in the IDP CRL extension and the | ||
| 447 | // DP field is absent from the DP, then verify that one of the | ||
| 448 | // names in the IDP matches one of the names in the crlIssuer | ||
| 449 | // field of the DP | ||
| 450 | } else { | ||
| 451 | // verify that one of the names in the IDP matches one of | ||
| 452 | // the names in the cRLIssuer of the cert's DP | ||
| 453 | boolean match = false; | ||
| 454 | for (Iterator<GeneralName> t = pointCrlIssuers.iterator(); | ||
| 455 | !match && t.hasNext(); ) { | ||
| 456 | GeneralNameInterface crlIssuerName = t.next().getName(); | ||
| 457 | for (Iterator<GeneralName> i = idpNames.iterator(); | ||
| 458 | !match && i.hasNext(); ) { | ||
| 459 | GeneralNameInterface idpName = i.next().getName(); | ||
| 460 | match = crlIssuerName.equals(idpName); | ||
| 461 | } | ||
| 462 | } | ||
| 463 | if (!match) { | ||
| 464 | return false; | ||
| 465 | } | ||
| 466 | } | ||
| 467 | } | ||
| 468 | |||
| 469 | // if the onlyContainsUserCerts boolean is asserted, verify that the | ||
| 470 | // cert is not a CA cert | ||
| 471 | Boolean b = (Boolean) | ||
| 472 | idpExt.get(IssuingDistributionPointExtension.ONLY_USER_CERTS); | ||
| 473 | if (b.equals(Boolean.TRUE) && certImpl.getBasicConstraints() != -1) { | ||
| 474 | if (debug != null) { | ||
| 475 | debug.println("cert must be a EE cert"); | ||
| 476 | } | ||
| 477 | return false; | ||
| 478 | } | ||
| 479 | |||
| 480 | // if the onlyContainsCACerts boolean is asserted, verify that the | ||
| 481 | // cert is a CA cert | ||
| 482 | b = (Boolean) | ||
| 483 | idpExt.get(IssuingDistributionPointExtension.ONLY_CA_CERTS); | ||
| 484 | if (b.equals(Boolean.TRUE) && certImpl.getBasicConstraints() == -1) { | ||
| 485 | if (debug != null) { | ||
| 486 | debug.println("cert must be a CA cert"); | ||
| 487 | } | ||
| 488 | return false; | ||
| 489 | } | ||
| 490 | |||
| 491 | // verify that the onlyContainsAttributeCerts boolean is not | ||
| 492 | // asserted | ||
| 493 | b = (Boolean) idpExt.get | ||
| 494 | (IssuingDistributionPointExtension.ONLY_ATTRIBUTE_CERTS); | ||
| 495 | if (b.equals(Boolean.TRUE)) { | ||
| 496 | if (debug != null) { | ||
| 497 | debug.println("cert must not be an AA cert"); | ||
| 498 | } | ||
| 499 | return false; | ||
| 500 | } | ||
| 501 | } | ||
| 502 | |||
| 503 | // compute interim reasons mask | ||
| 504 | boolean[] interimReasonsMask = new boolean[9]; | ||
| 505 | ReasonFlags reasons = null; | ||
| 506 | if (idpExt != null) { | ||
| 507 | reasons = (ReasonFlags) | ||
| 508 | idpExt.get(IssuingDistributionPointExtension.REASONS); | ||
| 509 | } | ||
| 510 | |||
| 511 | boolean[] pointReasonFlags = point.getReasonFlags(); | ||
| 512 | if (reasons != null) { | ||
| 513 | if (pointReasonFlags != null) { | ||
| 514 | // set interim reasons mask to the intersection of | ||
| 515 | // reasons in the DP and onlySomeReasons in the IDP | ||
| 516 | boolean[] idpReasonFlags = reasons.getFlags(); | ||
| 517 | for (int i = 0; i < idpReasonFlags.length; i++) { | ||
| 518 | if (idpReasonFlags[i] && pointReasonFlags[i]) { | ||
| 519 | interimReasonsMask[i] = true; | ||
| 520 | } | ||
| 521 | } | ||
| 522 | } else { | ||
| 523 | // set interim reasons mask to the value of | ||
| 524 | // onlySomeReasons in the IDP (and clone it since we may | ||
| 525 | // modify it) | ||
| 526 | interimReasonsMask = reasons.getFlags().clone(); | ||
| 527 | } | ||
| 528 | } else if (idpExt == null || reasons == null) { | ||
| 529 | if (pointReasonFlags != null) { | ||
| 530 | // set interim reasons mask to the value of DP reasons | ||
| 531 | interimReasonsMask = pointReasonFlags.clone(); | ||
| 532 | } else { | ||
| 533 | // set interim reasons mask to the special value all-reasons | ||
| 534 | interimReasonsMask = new boolean[9]; | ||
| 535 | Arrays.fill(interimReasonsMask, true); | ||
| 536 | } | ||
| 537 | } | ||
| 538 | |||
| 539 | // verify that interim reasons mask includes one or more reasons | ||
| 540 | // not included in the reasons mask | ||
| 541 | boolean oneOrMore = false; | ||
| 542 | for (int i=0; i < interimReasonsMask.length && !oneOrMore; i++) { | ||
| 543 | if (!reasonsMask[i] && interimReasonsMask[i]) { | ||
| 544 | oneOrMore = true; | ||
| 545 | } | ||
| 546 | } | ||
| 547 | if (!oneOrMore) { | ||
| 548 | return false; | ||
| 549 | } | ||
| 550 | |||
| 551 | // Obtain and validate the certification path for the complete | ||
| 552 | // CRL issuer (if indirect CRL). If a key usage extension is present | ||
| 553 | // in the CRL issuer's certificate, verify that the cRLSign bit is set. | ||
| 554 | if (indirectCRL) { | ||
| 555 | X509CertSelector certSel = new X509CertSelector(); | ||
| 556 | certSel.setSubject(crlIssuer.asX500Principal()); | ||
| 557 | boolean[] crlSign = {false,false,false,false,false,false,true}; | ||
| 558 | certSel.setKeyUsage(crlSign); | ||
| 559 | |||
| 560 | // Currently by default, forward builder does not enable | ||
| 561 | // subject/authority key identifier identifying for target | ||
| 562 | // certificate, instead, it only compares the CRL issuer and | ||
| 563 | // the target certificate subject. If the certificate of the | ||
| 564 | // delegated CRL issuer is a self-issued certificate, the | ||
| 565 | // builder is unable to find the proper CRL issuer by issuer | ||
| 566 | // name only, there is a potential dead loop on finding the | ||
| 567 | // proper issuer. It is of great help to narrow the target | ||
| 568 | // scope down to aware of authority key identifiers in the | ||
| 569 | // selector, for the purposes of breaking the dead loop. | ||
| 570 | AuthorityKeyIdentifierExtension akidext = | ||
| 571 | crlImpl.getAuthKeyIdExtension(); | ||
| 572 | if (akidext != null) { | ||
| 573 | KeyIdentifier akid = (KeyIdentifier)akidext.get(akidext.KEY_ID); | ||
| 574 | if (akid != null) { | ||
| 575 | DerOutputStream derout = new DerOutputStream(); | ||
| 576 | derout.putOctetString(akid.getIdentifier()); | ||
| 577 | certSel.setSubjectKeyIdentifier(derout.toByteArray()); | ||
| 578 | } | ||
| 579 | |||
| 580 | SerialNumber asn = | ||
| 581 | (SerialNumber)akidext.get(akidext.SERIAL_NUMBER); | ||
| 582 | if (asn != null) { | ||
| 583 | certSel.setSerialNumber(asn.getNumber()); | ||
| 584 | } | ||
| 585 | // the subject criterion will be set by builder automatically. | ||
| 586 | } | ||
| 587 | |||
| 588 | // by far, we have validated the previous certificate, we can | ||
| 589 | // trust it during validating the CRL issuer. | ||
| 590 | // Except the performance improvement, another benefit is to break | ||
| 591 | // the dead loop while looking for the issuer back and forth | ||
| 592 | // between the delegated self-issued certificate and its issuer. | ||
| 593 | Set<TrustAnchor> newTrustAnchors = new HashSet<>(trustAnchors); | ||
| 594 | |||
| 595 | if (prevKey != null) { | ||
| 596 | // Add the previous certificate as a trust anchor. | ||
| 597 | X500Principal principal = certImpl.getIssuerX500Principal(); | ||
| 598 | TrustAnchor temporary = | ||
| 599 | new TrustAnchor(principal, prevKey, null); | ||
| 600 | newTrustAnchors.add(temporary); | ||
| 601 | } | ||
| 602 | |||
| 603 | PKIXBuilderParameters params = null; | ||
| 604 | try { | ||
| 605 | params = new PKIXBuilderParameters(newTrustAnchors, certSel); | ||
| 606 | } catch (InvalidAlgorithmParameterException iape) { | ||
| 607 | throw new CRLException(iape); | ||
| 608 | } | ||
| 609 | params.setCertStores(certStores); | ||
| 610 | params.setSigProvider(provider); | ||
| 611 | params.setDate(validity); | ||
| 612 | try { | ||
| 613 | CertPathBuilder builder = CertPathBuilder.getInstance("PKIX"); | ||
| 614 | PKIXCertPathBuilderResult result = | ||
| 615 | (PKIXCertPathBuilderResult) builder.build(params); | ||
| 616 | prevKey = result.getPublicKey(); | ||
| 617 | } catch (Exception e) { | ||
| 618 | throw new CRLException(e); | ||
| 619 | } | ||
| 620 | } | ||
| 621 | |||
| 622 | // check the crl signature algorithm | ||
| 623 | try { | ||
| 624 | AlgorithmChecker.check(prevKey, crl); | ||
| 625 | } catch (CertPathValidatorException cpve) { | ||
| 626 | if (debug != null) { | ||
| 627 | debug.println("CRL signature algorithm check failed: " + cpve); | ||
| 628 | } | ||
| 629 | return false; | ||
| 630 | } | ||
| 631 | |||
| 632 | // validate the signature on the CRL | ||
| 633 | try { | ||
| 634 | crl.verify(prevKey, provider); | ||
| 635 | } catch (Exception e) { | ||
| 636 | if (debug != null) { | ||
| 637 | debug.println("CRL signature failed to verify"); | ||
| 638 | } | ||
| 639 | return false; | ||
| 640 | } | ||
| 641 | |||
| 642 | // reject CRL if any unresolved critical extensions remain in the CRL. | ||
| 643 | Set<String> unresCritExts = crl.getCriticalExtensionOIDs(); | ||
| 644 | // remove any that we have processed | ||
| 645 | if (unresCritExts != null) { | ||
| 646 | unresCritExts.remove | ||
| 647 | (PKIXExtensions.IssuingDistributionPoint_Id.toString()); | ||
| 648 | if (!unresCritExts.isEmpty()) { | ||
| 649 | if (debug != null) { | ||
| 650 | debug.println("Unrecognized critical extension(s) in CRL: " | ||
| 651 | + unresCritExts); | ||
| 652 | Iterator<String> i = unresCritExts.iterator(); | ||
| 653 | while (i.hasNext()) | ||
| 654 | debug.println(i.next()); | ||
| 655 | } | ||
| 656 | return false; | ||
| 657 | } | ||
| 658 | } | ||
| 659 | |||
| 660 | // update reasonsMask | ||
| 661 | for (int i=0; i < interimReasonsMask.length; i++) { | ||
| 662 | if (!reasonsMask[i] && interimReasonsMask[i]) { | ||
| 663 | reasonsMask[i] = true; | ||
| 664 | } | ||
| 665 | } | ||
| 666 | return true; | ||
| 667 | } | ||
| 668 | |||
| 669 | /** | ||
| 670 | * Append relative name to the issuer name and return a new | ||
| 671 | * GeneralNames object. | ||
| 672 | */ | ||
| 673 | private GeneralNames getFullNames(X500Name issuer, RDN rdn) | ||
| 674 | throws IOException { | ||
| 675 | List<RDN> rdns = new ArrayList<RDN>(issuer.rdns()); | ||
| 676 | rdns.add(rdn); | ||
| 677 | X500Name fullName = new X500Name(rdns.toArray(new RDN[0])); | ||
| 678 | GeneralNames fullNames = new GeneralNames(); | ||
| 679 | fullNames.add(new GeneralName(fullName)); | ||
| 680 | return fullNames; | ||
| 681 | } | ||
| 682 | |||
| 683 | /** Verifies whether a CRL is issued by a certain certificate | ||
| 684 | * | ||
| 685 | * @param cert the certificate | ||
| 686 | * @param crl the CRL to be verified | ||
| 687 | * @param provider the name of the signature provider | ||
| 688 | */ | ||
| 689 | private static boolean issues(X509CertImpl cert, X509CRLImpl crl, | ||
| 690 | String provider) throws IOException { | ||
| 691 | |||
| 692 | boolean matched = false; | ||
| 693 | |||
| 694 | AdaptableX509CertSelector issuerSelector = | ||
| 695 | new AdaptableX509CertSelector(); | ||
| 696 | |||
| 697 | // check certificate's key usage | ||
| 698 | boolean[] usages = cert.getKeyUsage(); | ||
| 699 | if (usages != null) { | ||
| 700 | usages[6] = true; // cRLSign | ||
| 701 | issuerSelector.setKeyUsage(usages); | ||
| 702 | } | ||
| 703 | |||
| 704 | // check certificate's subject | ||
| 705 | X500Principal crlIssuer = crl.getIssuerX500Principal(); | ||
| 706 | issuerSelector.setSubject(crlIssuer); | ||
| 707 | |||
| 708 | /* | ||
| 709 | * Facilitate certification path construction with authority | ||
| 710 | * key identifier and subject key identifier. | ||
| 711 | * | ||
| 712 | * In practice, conforming CAs MUST use the key identifier method, | ||
| 713 | * and MUST include authority key identifier extension in all CRLs | ||
| 714 | * issued. [section 5.2.1, RFC 2459] | ||
| 715 | */ | ||
| 716 | AuthorityKeyIdentifierExtension crlAKID = crl.getAuthKeyIdExtension(); | ||
| 717 | if (crlAKID != null) { | ||
| 718 | issuerSelector.parseAuthorityKeyIdentifierExtension(crlAKID); | ||
| 719 | } | ||
| 720 | |||
| 721 | matched = issuerSelector.match(cert); | ||
| 722 | |||
| 723 | // if AKID is unreliable, verify the CRL signature with the cert | ||
| 724 | if (matched && (crlAKID == null || | ||
| 725 | cert.getAuthorityKeyIdentifierExtension() == null)) { | ||
| 726 | try { | ||
| 727 | crl.verify(cert.getPublicKey(), provider); | ||
| 728 | matched = true; | ||
| 729 | } catch (Exception e) { | ||
| 730 | matched = false; | ||
| 731 | } | ||
| 732 | } | ||
| 733 | |||
| 734 | return matched; | ||
| 735 | } | ||
| 736 | } | ||