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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.math.BigInteger; | |
| 29 | +import java.util.Arrays; | |
| 30 | +import java.util.ArrayList; | |
| 31 | +import java.util.Collection; | |
| 32 | +import java.util.Collections; | |
| 33 | +import java.util.Date; | |
| 34 | +import java.util.List; | |
| 35 | +import java.util.HashSet; | |
| 36 | +import java.util.Set; | |
| 37 | +import java.util.Iterator; | |
| 38 | +import java.security.InvalidAlgorithmParameterException; | |
| 39 | +import java.security.NoSuchAlgorithmException; | |
| 40 | +import java.security.PublicKey; | |
| 41 | +import java.security.cert.*; | |
| 42 | +import java.security.cert.CertPathValidatorException.BasicReason; | |
| 43 | +import java.security.interfaces.DSAPublicKey; | |
| 44 | +import javax.security.auth.x500.X500Principal; | |
| 45 | +import sun.security.util.Debug; | |
| 46 | +import sun.security.x509.AccessDescription; | |
| 47 | +import sun.security.x509.AuthorityInfoAccessExtension; | |
| 48 | +import sun.security.x509.CRLDistributionPointsExtension; | |
| 49 | +import sun.security.x509.DistributionPoint; | |
| 50 | +import sun.security.x509.GeneralName; | |
| 51 | +import sun.security.x509.GeneralNames; | |
| 52 | +import sun.security.x509.PKIXExtensions; | |
| 53 | +import sun.security.x509.X500Name; | |
| 54 | +import sun.security.x509.X509CertImpl; | |
| 55 | +import sun.security.x509.X509CRLEntryImpl; | |
| 56 | + | |
| 57 | +/** | |
| 58 | + * CrlRevocationChecker is a <code>PKIXCertPathChecker</code> that checks | |
| 59 | + * revocation status information on a PKIX certificate using CRLs obtained | |
| 60 | + * from one or more <code>CertStores</code>. This is based on section 6.3 | |
| 61 | + * of RFC 3280 (http://www.ietf.org/rfc/rfc3280.txt). | |
| 62 | + * | |
| 63 | + * @since 1.4 | |
| 64 | + * @author Seth Proctor | |
| 65 | + * @author Steve Hanna | |
| 66 | + */ | |
| 67 | +class CrlRevocationChecker extends PKIXCertPathChecker { | |
| 68 | + | |
| 69 | + private static final Debug debug = Debug.getInstance("certpath"); | |
| 70 | + private final TrustAnchor mAnchor; | |
| 71 | + private final List<CertStore> mStores; | |
| 72 | + private final String mSigProvider; | |
| 73 | + private final Date mCurrentTime; | |
| 74 | + private PublicKey mPrevPubKey; | |
| 75 | + private boolean mCRLSignFlag; | |
| 76 | + private HashSet<X509CRL> mPossibleCRLs; | |
| 77 | + private HashSet<X509CRL> mApprovedCRLs; | |
| 78 | + private final PKIXParameters mParams; | |
| 79 | + private static final boolean [] mCrlSignUsage = | |
| 80 | + { false, false, false, false, false, false, true }; | |
| 81 | + private static final boolean[] ALL_REASONS = | |
| 82 | + {true, true, true, true, true, true, true, true, true}; | |
| 83 | + private boolean mOnlyEECert = false; | |
| 84 | + | |
| 85 | + // Maximum clock skew in milliseconds (15 minutes) allowed when checking | |
| 86 | + // validity of CRLs | |
| 87 | + private static final long MAX_CLOCK_SKEW = 900000; | |
| 88 | + | |
| 89 | + /** | |
| 90 | + * Creates a <code>CrlRevocationChecker</code>. | |
| 91 | + * | |
| 92 | + * @param anchor anchor selected to validate the target certificate | |
| 93 | + * @param params <code>PKIXParameters</code> to be used for | |
| 94 | + * finding certificates and CRLs, etc. | |
| 95 | + */ | |
| 96 | + CrlRevocationChecker(TrustAnchor anchor, PKIXParameters params) | |
| 97 | + throws CertPathValidatorException | |
| 98 | + { | |
| 99 | + this(anchor, params, null); | |
| 100 | + } | |
| 101 | + | |
| 102 | + /** | |
| 103 | + * Creates a <code>CrlRevocationChecker</code>, allowing | |
| 104 | + * extra certificates to be supplied beyond those contained | |
| 105 | + * in the <code>PKIXParameters</code>. | |
| 106 | + * | |
| 107 | + * @param anchor anchor selected to validate the target certificate | |
| 108 | + * @param params <code>PKIXParameters</code> to be used for | |
| 109 | + * finding certificates and CRLs, etc. | |
| 110 | + * @param certs a <code>Collection</code> of certificates | |
| 111 | + * that may be useful, beyond those available | |
| 112 | + * through <code>params</code> (<code>null</code> | |
| 113 | + * if none) | |
| 114 | + */ | |
| 115 | + CrlRevocationChecker(TrustAnchor anchor, PKIXParameters params, | |
| 116 | + Collection<X509Certificate> certs) throws CertPathValidatorException | |
| 117 | + { | |
| 118 | + this(anchor, params, certs, false); | |
| 119 | + } | |
| 120 | + | |
| 121 | + CrlRevocationChecker(TrustAnchor anchor, PKIXParameters params, | |
| 122 | + Collection<X509Certificate> certs, boolean onlyEECert) | |
| 123 | + throws CertPathValidatorException { | |
| 124 | + mAnchor = anchor; | |
| 125 | + mParams = params; | |
| 126 | + mStores = new ArrayList<CertStore>(params.getCertStores()); | |
| 127 | + mSigProvider = params.getSigProvider(); | |
| 128 | + if (certs != null) { | |
| 129 | + try { | |
| 130 | + mStores.add(CertStore.getInstance("Collection", | |
| 131 | + new CollectionCertStoreParameters(certs))); | |
| 132 | + } catch (Exception e) { | |
| 133 | + // should never occur but not necessarily fatal, so log it, | |
| 134 | + // ignore and continue | |
| 135 | + if (debug != null) { | |
| 136 | + debug.println("CrlRevocationChecker: " + | |
| 137 | + "error creating Collection CertStore: " + e); | |
| 138 | + } | |
| 139 | + } | |
| 140 | + } | |
| 141 | + Date testDate = params.getDate(); | |
| 142 | + mCurrentTime = (testDate != null ? testDate : new Date()); | |
| 143 | + mOnlyEECert = onlyEECert; | |
| 144 | + init(false); | |
| 145 | + } | |
| 146 | + | |
| 147 | + /** | |
| 148 | + * Initializes the internal state of the checker from parameters | |
| 149 | + * specified in the constructor | |
| 150 | + */ | |
| 151 | + public void init(boolean forward) throws CertPathValidatorException | |
| 152 | + { | |
| 153 | + if (!forward) { | |
| 154 | + if (mAnchor != null) { | |
| 155 | + if (mAnchor.getCAPublicKey() != null) { | |
| 156 | + mPrevPubKey = mAnchor.getCAPublicKey(); | |
| 157 | + } else { | |
| 158 | + mPrevPubKey = mAnchor.getTrustedCert().getPublicKey(); | |
| 159 | + } | |
| 160 | + } else { | |
| 161 | + mPrevPubKey = null; | |
| 162 | + } | |
| 163 | + mCRLSignFlag = true; | |
| 164 | + } else { | |
| 165 | + throw new CertPathValidatorException("forward checking " | |
| 166 | + + "not supported"); | |
| 167 | + } | |
| 168 | + } | |
| 169 | + | |
| 170 | + public boolean isForwardCheckingSupported() { | |
| 171 | + return false; | |
| 172 | + } | |
| 173 | + | |
| 174 | + public Set<String> getSupportedExtensions() { | |
| 175 | + return null; | |
| 176 | + } | |
| 177 | + | |
| 178 | + /** | |
| 179 | + * Performs the revocation status check on the certificate using | |
| 180 | + * its internal state. | |
| 181 | + * | |
| 182 | + * @param cert the Certificate | |
| 183 | + * @param unresolvedCritExts a Collection of the unresolved critical | |
| 184 | + * extensions | |
| 185 | + * @exception CertPathValidatorException Exception thrown if | |
| 186 | + * certificate does not verify | |
| 187 | + */ | |
| 188 | + public void check(Certificate cert, Collection<String> unresolvedCritExts) | |
| 189 | + throws CertPathValidatorException | |
| 190 | + { | |
| 191 | + X509Certificate currCert = (X509Certificate) cert; | |
| 192 | + verifyRevocationStatus(currCert, mPrevPubKey, mCRLSignFlag, true); | |
| 193 | + | |
| 194 | + // Make new public key if parameters are missing | |
| 195 | + PublicKey cKey = currCert.getPublicKey(); | |
| 196 | + if (cKey instanceof DSAPublicKey && | |
| 197 | + ((DSAPublicKey)cKey).getParams() == null) { | |
| 198 | + // cKey needs to inherit DSA parameters from prev key | |
| 199 | + cKey = BasicChecker.makeInheritedParamsKey(cKey, mPrevPubKey); | |
| 200 | + } | |
| 201 | + mPrevPubKey = cKey; | |
| 202 | + mCRLSignFlag = certCanSignCrl(currCert); | |
| 203 | + } | |
| 204 | + | |
| 205 | + /** | |
| 206 | + * Performs the revocation status check on the certificate using | |
| 207 | + * the provided state variables, as well as the constant internal | |
| 208 | + * data. | |
| 209 | + * | |
| 210 | + * @param currCert the Certificate | |
| 211 | + * @param prevKey the previous PublicKey in the chain | |
| 212 | + * @param signFlag a boolean as returned from the last call, or true | |
| 213 | + * if this is the first cert in the chain | |
| 214 | + * @return a boolean specifying if the cert is allowed to vouch for the | |
| 215 | + * validity of a CRL for the next iteration | |
| 216 | + * @exception CertPathValidatorException Exception thrown if | |
| 217 | + * certificate does not verify. | |
| 218 | + */ | |
| 219 | + public boolean check(X509Certificate currCert, PublicKey prevKey, | |
| 220 | + boolean signFlag) throws CertPathValidatorException | |
| 221 | + { | |
| 222 | + verifyRevocationStatus(currCert, prevKey, signFlag, true); | |
| 223 | + return certCanSignCrl(currCert); | |
| 224 | + } | |
| 225 | + | |
| 226 | + /** | |
| 227 | + * Checks that a cert can be used to verify a CRL. | |
| 228 | + * | |
| 229 | + * @param currCert an X509Certificate to check | |
| 230 | + * @return a boolean specifying if the cert is allowed to vouch for the | |
| 231 | + * validity of a CRL | |
| 232 | + */ | |
| 233 | + static boolean certCanSignCrl(X509Certificate currCert) { | |
| 234 | + // if the cert doesn't include the key usage ext, or | |
| 235 | + // the key usage ext asserts cRLSigning, return true, | |
| 236 | + // otherwise return false. | |
| 237 | + boolean[] kbools = currCert.getKeyUsage(); | |
| 238 | + if (kbools != null) { | |
| 239 | + return kbools[6]; | |
| 240 | + } | |
| 241 | + return false; | |
| 242 | + } | |
| 243 | + | |
| 244 | + /** | |
| 245 | + * Internal method to start the verification of a cert | |
| 246 | + */ | |
| 247 | + private void verifyRevocationStatus(X509Certificate currCert, | |
| 248 | + PublicKey prevKey, boolean signFlag, boolean allowSeparateKey) | |
| 249 | + throws CertPathValidatorException | |
| 250 | + { | |
| 251 | + verifyRevocationStatus(currCert, prevKey, signFlag, | |
| 252 | + allowSeparateKey, null, mParams.getTrustAnchors()); | |
| 253 | + } | |
| 254 | + | |
| 255 | + /** | |
| 256 | + * Internal method to start the verification of a cert | |
| 257 | + * @param stackedCerts a <code>Set</code> of <code>X509Certificate</code>s> | |
| 258 | + * whose revocation status depends on the | |
| 259 | + * non-revoked status of this cert. To avoid | |
| 260 | + * circular dependencies, we assume they're | |
| 261 | + * revoked while checking the revocation | |
| 262 | + * status of this cert. | |
| 263 | + * @param trustAnchors a <code>Set</code> of <code>TrustAnchor</code>s | |
| 264 | + */ | |
| 265 | + private void verifyRevocationStatus(X509Certificate currCert, | |
| 266 | + PublicKey prevKey, boolean signFlag, boolean allowSeparateKey, | |
| 267 | + Set<X509Certificate> stackedCerts, | |
| 268 | + Set<TrustAnchor> trustAnchors) throws CertPathValidatorException { | |
| 269 | + | |
| 270 | + String msg = "revocation status"; | |
| 271 | + if (debug != null) { | |
| 272 | + debug.println("CrlRevocationChecker.verifyRevocationStatus()" + | |
| 273 | + " ---checking " + msg + "..."); | |
| 274 | + } | |
| 275 | + | |
| 276 | + if (mOnlyEECert && currCert.getBasicConstraints() != -1) { | |
| 277 | + if (debug != null) { | |
| 278 | + debug.println("Skipping revocation check, not end entity cert"); | |
| 279 | + } | |
| 280 | + return; | |
| 281 | + } | |
| 282 | + | |
| 283 | + // reject circular dependencies - RFC 3280 is not explicit on how | |
| 284 | + // to handle this, so we feel it is safest to reject them until | |
| 285 | + // the issue is resolved in the PKIX WG. | |
| 286 | + if ((stackedCerts != null) && stackedCerts.contains(currCert)) { | |
| 287 | + if (debug != null) { | |
| 288 | + debug.println("CrlRevocationChecker.verifyRevocationStatus()" + | |
| 289 | + " circular dependency"); | |
| 290 | + } | |
| 291 | + throw new CertPathValidatorException | |
| 292 | + ("Could not determine revocation status", null, null, -1, | |
| 293 | + BasicReason.UNDETERMINED_REVOCATION_STATUS); | |
| 294 | + } | |
| 295 | + | |
| 296 | + // init the state for this run | |
| 297 | + mPossibleCRLs = new HashSet<X509CRL>(); | |
| 298 | + mApprovedCRLs = new HashSet<X509CRL>(); | |
| 299 | + boolean[] reasonsMask = new boolean[9]; | |
| 300 | + | |
| 301 | + try { | |
| 302 | + X509CRLSelector sel = new X509CRLSelector(); | |
| 303 | + sel.setCertificateChecking(currCert); | |
| 304 | + CertPathHelper.setDateAndTime(sel, mCurrentTime, MAX_CLOCK_SKEW); | |
| 305 | + | |
| 306 | + for (CertStore mStore : mStores) { | |
| 307 | + for (java.security.cert.CRL crl : mStore.getCRLs(sel)) { | |
| 308 | + mPossibleCRLs.add((X509CRL)crl); | |
| 309 | + } | |
| 310 | + } | |
| 311 | + DistributionPointFetcher store = | |
| 312 | + DistributionPointFetcher.getInstance(); | |
| 313 | + // all CRLs returned by the DP Fetcher have also been verified | |
| 314 | + mApprovedCRLs.addAll(store.getCRLs(sel, signFlag, prevKey, | |
| 315 | + mSigProvider, mStores, reasonsMask, trustAnchors, | |
| 316 | + mParams.getDate())); | |
| 317 | + } catch (Exception e) { | |
| 318 | + if (debug != null) { | |
| 319 | + debug.println("CrlRevocationChecker.verifyRevocationStatus() " | |
| 320 | + + "unexpected exception: " + e.getMessage()); | |
| 321 | + } | |
| 322 | + throw new CertPathValidatorException(e); | |
| 323 | + } | |
| 324 | + | |
| 325 | + if (debug != null) { | |
| 326 | + debug.println("CrlRevocationChecker.verifyRevocationStatus() " + | |
| 327 | + "crls.size() = " + mPossibleCRLs.size()); | |
| 328 | + } | |
| 329 | + if (!mPossibleCRLs.isEmpty()) { | |
| 330 | + // Now that we have a list of possible CRLs, see which ones can | |
| 331 | + // be approved | |
| 332 | + mApprovedCRLs.addAll(verifyPossibleCRLs(mPossibleCRLs, currCert, | |
| 333 | + signFlag, prevKey, reasonsMask, trustAnchors)); | |
| 334 | + } | |
| 335 | + if (debug != null) { | |
| 336 | + debug.println("CrlRevocationChecker.verifyRevocationStatus() " + | |
| 337 | + "approved crls.size() = " + mApprovedCRLs.size()); | |
| 338 | + } | |
| 339 | + | |
| 340 | + // make sure that we have at least one CRL that _could_ cover | |
| 341 | + // the certificate in question and all reasons are covered | |
| 342 | + if (mApprovedCRLs.isEmpty() || | |
| 343 | + !Arrays.equals(reasonsMask, ALL_REASONS)) { | |
| 344 | + if (allowSeparateKey) { | |
| 345 | + verifyWithSeparateSigningKey(currCert, prevKey, signFlag, | |
| 346 | + stackedCerts); | |
| 347 | + return; | |
| 348 | + } else { | |
| 349 | + throw new CertPathValidatorException | |
| 350 | + ("Could not determine revocation status", null, null, -1, | |
| 351 | + BasicReason.UNDETERMINED_REVOCATION_STATUS); | |
| 352 | + } | |
| 353 | + } | |
| 354 | + | |
| 355 | + // See if the cert is in the set of approved crls. | |
| 356 | + if (debug != null) { | |
| 357 | + BigInteger sn = currCert.getSerialNumber(); | |
| 358 | + debug.println("CrlRevocationChecker.verifyRevocationStatus() " + | |
| 359 | + "starting the final sweep..."); | |
| 360 | + debug.println("CrlRevocationChecker.verifyRevocationStatus" + | |
| 361 | + " cert SN: " + sn.toString()); | |
| 362 | + } | |
| 363 | + | |
| 364 | + CRLReason reasonCode = CRLReason.UNSPECIFIED; | |
| 365 | + X509CRLEntryImpl entry = null; | |
| 366 | + for (X509CRL crl : mApprovedCRLs) { | |
| 367 | + X509CRLEntry e = crl.getRevokedCertificate(currCert); | |
| 368 | + if (e != null) { | |
| 369 | + try { | |
| 370 | + entry = X509CRLEntryImpl.toImpl(e); | |
| 371 | + } catch (CRLException ce) { | |
| 372 | + throw new CertPathValidatorException(ce); | |
| 373 | + } | |
| 374 | + if (debug != null) { | |
| 375 | + debug.println("CrlRevocationChecker.verifyRevocationStatus" | |
| 376 | + + " CRL entry: " + entry.toString()); | |
| 377 | + } | |
| 378 | + | |
| 379 | + /* | |
| 380 | + * Abort CRL validation and throw exception if there are any | |
| 381 | + * unrecognized critical CRL entry extensions (see section | |
| 382 | + * 5.3 of RFC 3280). | |
| 383 | + */ | |
| 384 | + Set<String> unresCritExts = entry.getCriticalExtensionOIDs(); | |
| 385 | + if (unresCritExts != null && !unresCritExts.isEmpty()) { | |
| 386 | + /* remove any that we will process */ | |
| 387 | + unresCritExts.remove | |
| 388 | + (PKIXExtensions.ReasonCode_Id.toString()); | |
| 389 | + unresCritExts.remove | |
| 390 | + (PKIXExtensions.CertificateIssuer_Id.toString()); | |
| 391 | + if (!unresCritExts.isEmpty()) { | |
| 392 | + if (debug != null) { | |
| 393 | + debug.println("Unrecognized " | |
| 394 | + + "critical extension(s) in revoked CRL entry: " | |
| 395 | + + unresCritExts); | |
| 396 | + } | |
| 397 | + throw new CertPathValidatorException | |
| 398 | + ("Could not determine revocation status", null, null, | |
| 399 | + -1, BasicReason.UNDETERMINED_REVOCATION_STATUS); | |
| 400 | + } | |
| 401 | + } | |
| 402 | + | |
| 403 | + reasonCode = entry.getRevocationReason(); | |
| 404 | + if (reasonCode == null) { | |
| 405 | + reasonCode = CRLReason.UNSPECIFIED; | |
| 406 | + } | |
| 407 | + Throwable t = new CertificateRevokedException | |
| 408 | + (entry.getRevocationDate(), reasonCode, | |
| 409 | + crl.getIssuerX500Principal(), entry.getExtensions()); | |
| 410 | + throw new CertPathValidatorException(t.getMessage(), t, | |
| 411 | + null, -1, BasicReason.REVOKED); | |
| 412 | + } | |
| 413 | + } | |
| 414 | + } | |
| 415 | + | |
| 416 | + /** | |
| 417 | + * We have a cert whose revocation status couldn't be verified by | |
| 418 | + * a CRL issued by the cert that issued the CRL. See if we can | |
| 419 | + * find a valid CRL issued by a separate key that can verify the | |
| 420 | + * revocation status of this certificate. | |
| 421 | + * <p> | |
| 422 | + * Note that this does not provide support for indirect CRLs, | |
| 423 | + * only CRLs signed with a different key (but the same issuer | |
| 424 | + * name) as the certificate being checked. | |
| 425 | + * | |
| 426 | + * @param currCert the <code>X509Certificate</code> to be checked | |
| 427 | + * @param prevKey the <code>PublicKey</code> that failed | |
| 428 | + * @param signFlag <code>true</code> if that key was trusted to sign CRLs | |
| 429 | + * @param stackedCerts a <code>Set</code> of <code>X509Certificate</code>s> | |
| 430 | + * whose revocation status depends on the | |
| 431 | + * non-revoked status of this cert. To avoid | |
| 432 | + * circular dependencies, we assume they're | |
| 433 | + * revoked while checking the revocation | |
| 434 | + * status of this cert. | |
| 435 | + * @throws CertPathValidatorException if the cert's revocation status | |
| 436 | + * cannot be verified successfully with another key | |
| 437 | + */ | |
| 438 | + private void verifyWithSeparateSigningKey(X509Certificate currCert, | |
| 439 | + PublicKey prevKey, boolean signFlag, Set<X509Certificate> stackedCerts) | |
| 440 | + throws CertPathValidatorException { | |
| 441 | + String msg = "revocation status"; | |
| 442 | + if (debug != null) { | |
| 443 | + debug.println( | |
| 444 | + "CrlRevocationChecker.verifyWithSeparateSigningKey()" + | |
| 445 | + " ---checking " + msg + "..."); | |
| 446 | + } | |
| 447 | + | |
| 448 | + // reject circular dependencies - RFC 3280 is not explicit on how | |
| 449 | + // to handle this, so we feel it is safest to reject them until | |
| 450 | + // the issue is resolved in the PKIX WG. | |
| 451 | + if ((stackedCerts != null) && stackedCerts.contains(currCert)) { | |
| 452 | + if (debug != null) { | |
| 453 | + debug.println( | |
| 454 | + "CrlRevocationChecker.verifyWithSeparateSigningKey()" + | |
| 455 | + " circular dependency"); | |
| 456 | + } | |
| 457 | + throw new CertPathValidatorException | |
| 458 | + ("Could not determine revocation status", null, null, | |
| 459 | + -1, BasicReason.UNDETERMINED_REVOCATION_STATUS); | |
| 460 | + } | |
| 461 | + | |
| 462 | + // If prevKey wasn't trusted, maybe we just didn't have the right | |
| 463 | + // path to it. Don't rule that key out. | |
| 464 | + if (!signFlag) { | |
| 465 | + prevKey = null; | |
| 466 | + } | |
| 467 | + | |
| 468 | + // Try to find another key that might be able to sign | |
| 469 | + // CRLs vouching for this cert. | |
| 470 | + buildToNewKey(currCert, prevKey, stackedCerts); | |
| 471 | + } | |
| 472 | + | |
| 473 | + /** | |
| 474 | + * Tries to find a CertPath that establishes a key that can be | |
| 475 | + * used to verify the revocation status of a given certificate. | |
| 476 | + * Ignores keys that have previously been tried. Throws a | |
| 477 | + * CertPathValidatorException if no such key could be found. | |
| 478 | + * | |
| 479 | + * @param currCert the <code>X509Certificate</code> to be checked | |
| 480 | + * @param prevKey the <code>PublicKey</code> of the certificate whose key | |
| 481 | + * cannot be used to vouch for the CRL and should be ignored | |
| 482 | + * @param stackedCerts a <code>Set</code> of <code>X509Certificate</code>s> | |
| 483 | + * whose revocation status depends on the | |
| 484 | + * establishment of this path. | |
| 485 | + * @throws CertPathValidatorException on failure | |
| 486 | + */ | |
| 487 | + private void buildToNewKey(X509Certificate currCert, | |
| 488 | + PublicKey prevKey, Set<X509Certificate> stackedCerts) | |
| 489 | + throws CertPathValidatorException { | |
| 490 | + | |
| 491 | + if (debug != null) { | |
| 492 | + debug.println("CrlRevocationChecker.buildToNewKey()" + | |
| 493 | + " starting work"); | |
| 494 | + } | |
| 495 | + Set<PublicKey> badKeys = new HashSet<PublicKey>(); | |
| 496 | + if (prevKey != null) { | |
| 497 | + badKeys.add(prevKey); | |
| 498 | + } | |
| 499 | + X509CertSelector certSel = new RejectKeySelector(badKeys); | |
| 500 | + certSel.setSubject(currCert.getIssuerX500Principal()); | |
| 501 | + certSel.setKeyUsage(mCrlSignUsage); | |
| 502 | + | |
| 503 | + Set<TrustAnchor> newAnchors = | |
| 504 | + (mAnchor == null ? mParams.getTrustAnchors() : | |
| 505 | + Collections.singleton(mAnchor)); | |
| 506 | + | |
| 507 | + PKIXBuilderParameters builderParams; | |
| 508 | + if (mParams instanceof PKIXBuilderParameters) { | |
| 509 | + builderParams = (PKIXBuilderParameters) mParams.clone(); | |
| 510 | + builderParams.setTargetCertConstraints(certSel); | |
| 511 | + // Policy qualifiers must be rejected, since we don't have | |
| 512 | + // any way to convey them back to the application. | |
| 513 | + builderParams.setPolicyQualifiersRejected(true); | |
| 514 | + try { | |
| 515 | + builderParams.setTrustAnchors(newAnchors); | |
| 516 | + } catch (InvalidAlgorithmParameterException iape) { | |
| 517 | + throw new RuntimeException(iape); // should never occur | |
| 518 | + } | |
| 519 | + } else { | |
| 520 | + // It's unfortunate that there's no easy way to make a | |
| 521 | + // PKIXBuilderParameters object from a PKIXParameters | |
| 522 | + // object. This might miss some things if parameters | |
| 523 | + // are added in the future or the validatorParams object | |
| 524 | + // is a custom class derived from PKIXValidatorParameters. | |
| 525 | + try { | |
| 526 | + builderParams = new PKIXBuilderParameters(newAnchors, certSel); | |
| 527 | + } catch (InvalidAlgorithmParameterException iape) { | |
| 528 | + throw new RuntimeException(iape); // should never occur | |
| 529 | + } | |
| 530 | + builderParams.setInitialPolicies(mParams.getInitialPolicies()); | |
| 531 | + builderParams.setCertStores(mStores); | |
| 532 | + builderParams.setExplicitPolicyRequired | |
| 533 | + (mParams.isExplicitPolicyRequired()); | |
| 534 | + builderParams.setPolicyMappingInhibited | |
| 535 | + (mParams.isPolicyMappingInhibited()); | |
| 536 | + builderParams.setAnyPolicyInhibited(mParams.isAnyPolicyInhibited()); | |
| 537 | + // Policy qualifiers must be rejected, since we don't have | |
| 538 | + // any way to convey them back to the application. | |
| 539 | + // That's the default, so no need to write code. | |
| 540 | + builderParams.setDate(mParams.getDate()); | |
| 541 | + builderParams.setCertPathCheckers(mParams.getCertPathCheckers()); | |
| 542 | + builderParams.setSigProvider(mParams.getSigProvider()); | |
| 543 | + } | |
| 544 | + | |
| 545 | + // Skip revocation during this build to detect circular | |
| 546 | + // references. But check revocation afterwards, using the | |
| 547 | + // key (or any other that works). | |
| 548 | + builderParams.setRevocationEnabled(false); | |
| 549 | + | |
| 550 | + // check for AuthorityInformationAccess extension | |
| 551 | + if (Builder.USE_AIA == true) { | |
| 552 | + X509CertImpl currCertImpl = null; | |
| 553 | + try { | |
| 554 | + currCertImpl = X509CertImpl.toImpl(currCert); | |
| 555 | + } catch (CertificateException ce) { | |
| 556 | + // ignore but log it | |
| 557 | + if (debug != null) { | |
| 558 | + debug.println("CrlRevocationChecker.buildToNewKey: " + | |
| 559 | + "error decoding cert: " + ce); | |
| 560 | + } | |
| 561 | + } | |
| 562 | + AuthorityInfoAccessExtension aiaExt = null; | |
| 563 | + if (currCertImpl != null) { | |
| 564 | + aiaExt = currCertImpl.getAuthorityInfoAccessExtension(); | |
| 565 | + } | |
| 566 | + if (aiaExt != null) { | |
| 567 | + List<AccessDescription> adList = aiaExt.getAccessDescriptions(); | |
| 568 | + if (adList != null) { | |
| 569 | + for (AccessDescription ad : adList) { | |
| 570 | + CertStore cs = URICertStore.getInstance(ad); | |
| 571 | + if (cs != null) { | |
| 572 | + if (debug != null) { | |
| 573 | + debug.println("adding AIAext CertStore"); | |
| 574 | + } | |
| 575 | + builderParams.addCertStore(cs); | |
| 576 | + } | |
| 577 | + } | |
| 578 | + } | |
| 579 | + } | |
| 580 | + } | |
| 581 | + | |
| 582 | + CertPathBuilder builder = null; | |
| 583 | + try { | |
| 584 | + builder = CertPathBuilder.getInstance("PKIX"); | |
| 585 | + } catch (NoSuchAlgorithmException nsae) { | |
| 586 | + throw new CertPathValidatorException(nsae); | |
| 587 | + } | |
| 588 | + while (true) { | |
| 589 | + try { | |
| 590 | + if (debug != null) { | |
| 591 | + debug.println("CrlRevocationChecker.buildToNewKey()" + | |
| 592 | + " about to try build ..."); | |
| 593 | + } | |
| 594 | + PKIXCertPathBuilderResult cpbr = | |
| 595 | + (PKIXCertPathBuilderResult) builder.build(builderParams); | |
| 596 | + | |
| 597 | + if (debug != null) { | |
| 598 | + debug.println("CrlRevocationChecker.buildToNewKey()" + | |
| 599 | + " about to check revocation ..."); | |
| 600 | + } | |
| 601 | + // Now check revocation of all certs in path, assuming that | |
| 602 | + // the stackedCerts are revoked. | |
| 603 | + if (stackedCerts == null) { | |
| 604 | + stackedCerts = new HashSet<X509Certificate>(); | |
| 605 | + } | |
| 606 | + stackedCerts.add(currCert); | |
| 607 | + TrustAnchor ta = cpbr.getTrustAnchor(); | |
| 608 | + PublicKey prevKey2 = ta.getCAPublicKey(); | |
| 609 | + if (prevKey2 == null) { | |
| 610 | + prevKey2 = ta.getTrustedCert().getPublicKey(); | |
| 611 | + } | |
| 612 | + boolean signFlag = true; | |
| 613 | + List<? extends Certificate> cpList = | |
| 614 | + cpbr.getCertPath().getCertificates(); | |
| 615 | + try { | |
| 616 | + for (int i = cpList.size()-1; i >= 0; i-- ) { | |
| 617 | + X509Certificate cert = (X509Certificate) cpList.get(i); | |
| 618 | + | |
| 619 | + if (debug != null) { | |
| 620 | + debug.println("CrlRevocationChecker.buildToNewKey()" | |
| 621 | + + " index " + i + " checking " + cert); | |
| 622 | + } | |
| 623 | + verifyRevocationStatus(cert, prevKey2, signFlag, true, | |
| 624 | + stackedCerts, newAnchors); | |
| 625 | + signFlag = certCanSignCrl(cert); | |
| 626 | + prevKey2 = cert.getPublicKey(); | |
| 627 | + } | |
| 628 | + } catch (CertPathValidatorException cpve) { | |
| 629 | + // ignore it and try to get another key | |
| 630 | + badKeys.add(cpbr.getPublicKey()); | |
| 631 | + continue; | |
| 632 | + } | |
| 633 | + | |
| 634 | + if (debug != null) { | |
| 635 | + debug.println("CrlRevocationChecker.buildToNewKey()" + | |
| 636 | + " got key " + cpbr.getPublicKey()); | |
| 637 | + } | |
| 638 | + // Now check revocation on the current cert using that key. | |
| 639 | + // If it doesn't check out, try to find a different key. | |
| 640 | + // And if we can't find a key, then return false. | |
| 641 | + PublicKey newKey = cpbr.getPublicKey(); | |
| 642 | + try { | |
| 643 | + verifyRevocationStatus(currCert, newKey, true, false); | |
| 644 | + // If that passed, the cert is OK! | |
| 645 | + return; | |
| 646 | + } catch (CertPathValidatorException cpve) { | |
| 647 | + // If it is revoked, rethrow exception | |
| 648 | + if (cpve.getReason() == BasicReason.REVOKED) { | |
| 649 | + throw cpve; | |
| 650 | + } | |
| 651 | + // Otherwise, ignore the exception and | |
| 652 | + // try to get another key. | |
| 653 | + } | |
| 654 | + badKeys.add(newKey); | |
| 655 | + } catch (InvalidAlgorithmParameterException iape) { | |
| 656 | + throw new CertPathValidatorException(iape); | |
| 657 | + } catch (CertPathBuilderException cpbe) { | |
| 658 | + throw new CertPathValidatorException | |
| 659 | + ("Could not determine revocation status", null, null, | |
| 660 | + -1, BasicReason.UNDETERMINED_REVOCATION_STATUS); | |
| 661 | + } | |
| 662 | + } | |
| 663 | + } | |
| 664 | + | |
| 665 | + /* | |
| 666 | + * This inner class extends the X509CertSelector to add an additional | |
| 667 | + * check to make sure the subject public key isn't on a particular list. | |
| 668 | + * This class is used by buildToNewKey() to make sure the builder doesn't | |
| 669 | + * end up with a CertPath to a public key that has already been rejected. | |
| 670 | + */ | |
| 671 | + private static class RejectKeySelector extends X509CertSelector { | |
| 672 | + private final Set<PublicKey> badKeySet; | |
| 673 | + | |
| 674 | + /** | |
| 675 | + * Creates a new <code>RejectKeySelector</code>. | |
| 676 | + * | |
| 677 | + * @param badPublicKeys a <code>Set</code> of | |
| 678 | + * <code>PublicKey</code>s that | |
| 679 | + * should be rejected (or <code>null</code> | |
| 680 | + * if no such check should be done) | |
| 681 | + */ | |
| 682 | + RejectKeySelector(Set<PublicKey> badPublicKeys) { | |
| 683 | + this.badKeySet = badPublicKeys; | |
| 684 | + } | |
| 685 | + | |
| 686 | + /** | |
| 687 | + * Decides whether a <code>Certificate</code> should be selected. | |
| 688 | + * | |
| 689 | + * @param cert the <code>Certificate</code> to be checked | |
| 690 | + * @return <code>true</code> if the <code>Certificate</code> should be | |
| 691 | + * selected, <code>false</code> otherwise | |
| 692 | + */ | |
| 693 | + public boolean match(Certificate cert) { | |
| 694 | + if (!super.match(cert)) | |
| 695 | + return(false); | |
| 696 | + | |
| 697 | + if (badKeySet.contains(cert.getPublicKey())) { | |
| 698 | + if (debug != null) | |
| 699 | + debug.println("RejectCertSelector.match: bad key"); | |
| 700 | + return false; | |
| 701 | + } | |
| 702 | + | |
| 703 | + if (debug != null) | |
| 704 | + debug.println("RejectCertSelector.match: returning true"); | |
| 705 | + return true; | |
| 706 | + } | |
| 707 | + | |
| 708 | + /** | |
| 709 | + * Return a printable representation of the <code>CertSelector</code>. | |
| 710 | + * | |
| 711 | + * @return a <code>String</code> describing the contents of the | |
| 712 | + * <code>CertSelector</code> | |
| 713 | + */ | |
| 714 | + public String toString() { | |
| 715 | + StringBuilder sb = new StringBuilder(); | |
| 716 | + sb.append("RejectCertSelector: [\n"); | |
| 717 | + sb.append(super.toString()); | |
| 718 | + sb.append(badKeySet); | |
| 719 | + sb.append("]"); | |
| 720 | + return sb.toString(); | |
| 721 | + } | |
| 722 | + } | |
| 723 | + | |
| 724 | + /** | |
| 725 | + * Internal method that verifies a set of possible_crls, | |
| 726 | + * and sees if each is approved, based on the cert. | |
| 727 | + * | |
| 728 | + * @param crls a set of possible CRLs to test for acceptability | |
| 729 | + * @param cert the certificate whose revocation status is being checked | |
| 730 | + * @param signFlag <code>true</code> if prevKey was trusted to sign CRLs | |
| 731 | + * @param prevKey the public key of the issuer of cert | |
| 732 | + * @param reasonsMask the reason code mask | |
| 733 | + * @param trustAnchors a <code>Set</code> of <code>TrustAnchor</code>s> | |
| 734 | + * @return a collection of approved crls (or an empty collection) | |
| 735 | + */ | |
| 736 | + private Collection<X509CRL> verifyPossibleCRLs(Set<X509CRL> crls, | |
| 737 | + X509Certificate cert, boolean signFlag, PublicKey prevKey, | |
| 738 | + boolean[] reasonsMask, | |
| 739 | + Set<TrustAnchor> trustAnchors) throws CertPathValidatorException { | |
| 740 | + | |
| 741 | + try { | |
| 742 | + X509CertImpl certImpl = X509CertImpl.toImpl(cert); | |
| 743 | + if (debug != null) { | |
| 744 | + debug.println("CRLRevocationChecker.verifyPossibleCRLs: " + | |
| 745 | + "Checking CRLDPs for " | |
| 746 | + + certImpl.getSubjectX500Principal()); | |
| 747 | + } | |
| 748 | + CRLDistributionPointsExtension ext = | |
| 749 | + certImpl.getCRLDistributionPointsExtension(); | |
| 750 | + List<DistributionPoint> points = null; | |
| 751 | + if (ext == null) { | |
| 752 | + // assume a DP with reasons and CRLIssuer fields omitted | |
| 753 | + // and a DP name of the cert issuer. | |
| 754 | + // TODO add issuerAltName too | |
| 755 | + X500Name certIssuer = (X500Name)certImpl.getIssuerDN(); | |
| 756 | + DistributionPoint point = new DistributionPoint | |
| 757 | + (new GeneralNames().add(new GeneralName(certIssuer)), | |
| 758 | + null, null); | |
| 759 | + points = Collections.singletonList(point); | |
| 760 | + } else { | |
| 761 | + points = (List<DistributionPoint>)ext.get( | |
| 762 | + CRLDistributionPointsExtension.POINTS); | |
| 763 | + } | |
| 764 | + Set<X509CRL> results = new HashSet<X509CRL>(); | |
| 765 | + DistributionPointFetcher dpf = | |
| 766 | + DistributionPointFetcher.getInstance(); | |
| 767 | + for (Iterator<DistributionPoint> t = points.iterator(); | |
| 768 | + t.hasNext() && !Arrays.equals(reasonsMask, ALL_REASONS); ) { | |
| 769 | + DistributionPoint point = t.next(); | |
| 770 | + for (X509CRL crl : crls) { | |
| 771 | + if (dpf.verifyCRL(certImpl, point, crl, reasonsMask, | |
| 772 | + signFlag, prevKey, mSigProvider, | |
| 773 | + trustAnchors, mStores, mParams.getDate())) { | |
| 774 | + results.add(crl); | |
| 775 | + } | |
| 776 | + } | |
| 777 | + } | |
| 778 | + return results; | |
| 779 | + } catch (Exception e) { | |
| 780 | + if (debug != null) { | |
| 781 | + debug.println("Exception while verifying CRL: "+e.getMessage()); | |
| 782 | + e.printStackTrace(); | |
| 783 | + } | |
| 784 | + return Collections.emptySet(); | |
| 785 | + } | |
| 786 | + } | |
| 787 | +} | |