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| 1 | +/* | |
| 2 | + * Copyright (c) 2000, 2010, 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.GeneralSecurityException; | |
| 31 | +import java.security.InvalidAlgorithmParameterException; | |
| 32 | +import java.security.Principal; | |
| 33 | +import java.security.PublicKey; | |
| 34 | +import java.security.cert.*; | |
| 35 | +import java.security.cert.PKIXReason; | |
| 36 | +import java.security.interfaces.DSAPublicKey; | |
| 37 | +import java.util.ArrayList; | |
| 38 | +import java.util.Collection; | |
| 39 | +import java.util.Collections; | |
| 40 | +import java.util.Comparator; | |
| 41 | +import java.util.HashSet; | |
| 42 | +import java.util.Iterator; | |
| 43 | +import java.util.List; | |
| 44 | +import java.util.LinkedList; | |
| 45 | +import java.util.Set; | |
| 46 | +import javax.security.auth.x500.X500Principal; | |
| 47 | + | |
| 48 | +import sun.security.action.GetBooleanSecurityPropertyAction; | |
| 49 | +import sun.security.x509.X500Name; | |
| 50 | +import sun.security.x509.PKIXExtensions; | |
| 51 | +import sun.security.util.Debug; | |
| 52 | + | |
| 53 | +/** | |
| 54 | + * This class is able to build certification paths in either the forward | |
| 55 | + * or reverse directions. | |
| 56 | + * | |
| 57 | + * <p> If successful, it returns a certification path which has succesfully | |
| 58 | + * satisfied all the constraints and requirements specified in the | |
| 59 | + * PKIXBuilderParameters object and has been validated according to the PKIX | |
| 60 | + * path validation algorithm defined in RFC 3280. | |
| 61 | + * | |
| 62 | + * <p> This implementation uses a depth-first search approach to finding | |
| 63 | + * certification paths. If it comes to a point in which it cannot find | |
| 64 | + * any more certificates leading to the target OR the path length is too long | |
| 65 | + * it backtracks to previous paths until the target has been found or | |
| 66 | + * all possible paths have been exhausted. | |
| 67 | + * | |
| 68 | + * <p> This implementation is not thread-safe. | |
| 69 | + * | |
| 70 | + * @since 1.4 | |
| 71 | + * @author Sean Mullan | |
| 72 | + * @author Yassir Elley | |
| 73 | + */ | |
| 74 | +public final class SunCertPathBuilder extends CertPathBuilderSpi { | |
| 75 | + | |
| 76 | + private static final Debug debug = Debug.getInstance("certpath"); | |
| 77 | + | |
| 78 | + /* | |
| 79 | + * private objects shared by methods | |
| 80 | + */ | |
| 81 | + private PKIXBuilderParameters buildParams; | |
| 82 | + private CertificateFactory cf; | |
| 83 | + private boolean pathCompleted = false; | |
| 84 | + private X500Principal targetSubjectDN; | |
| 85 | + private PolicyNode policyTreeResult; | |
| 86 | + private TrustAnchor trustAnchor; | |
| 87 | + private PublicKey finalPublicKey; | |
| 88 | + private X509CertSelector targetSel; | |
| 89 | + private List<CertStore> orderedCertStores; | |
| 90 | + private boolean onlyEECert = false; | |
| 91 | + | |
| 92 | + /** | |
| 93 | + * Create an instance of <code>SunCertPathBuilder</code>. | |
| 94 | + * | |
| 95 | + * @throws CertPathBuilderException if an error occurs | |
| 96 | + */ | |
| 97 | + public SunCertPathBuilder() throws CertPathBuilderException { | |
| 98 | + try { | |
| 99 | + cf = CertificateFactory.getInstance("X.509"); | |
| 100 | + } catch (CertificateException e) { | |
| 101 | + throw new CertPathBuilderException(e); | |
| 102 | + } | |
| 103 | + onlyEECert = AccessController.doPrivileged( | |
| 104 | + new GetBooleanSecurityPropertyAction | |
| 105 | + ("com.sun.security.onlyCheckRevocationOfEECert")); | |
| 106 | + } | |
| 107 | + | |
| 108 | + /** | |
| 109 | + * Attempts to build a certification path using the Sun build | |
| 110 | + * algorithm from a trusted anchor(s) to a target subject, which must both | |
| 111 | + * be specified in the input parameter set. By default, this method will | |
| 112 | + * attempt to build in the forward direction. In order to build in the | |
| 113 | + * reverse direction, the caller needs to pass in an instance of | |
| 114 | + * SunCertPathBuilderParameters with the buildForward flag set to false. | |
| 115 | + * | |
| 116 | + * <p>The certification path that is constructed is validated | |
| 117 | + * according to the PKIX specification. | |
| 118 | + * | |
| 119 | + * @param params the parameter set for building a path. Must be an instance | |
| 120 | + * of <code>PKIXBuilderParameters</code>. | |
| 121 | + * @return a certification path builder result. | |
| 122 | + * @exception CertPathBuilderException Exception thrown if builder is | |
| 123 | + * unable to build a complete certification path from the trusted anchor(s) | |
| 124 | + * to the target subject. | |
| 125 | + * @throws InvalidAlgorithmParameterException if the given parameters are | |
| 126 | + * inappropriate for this certification path builder. | |
| 127 | + */ | |
| 128 | + public CertPathBuilderResult engineBuild(CertPathParameters params) | |
| 129 | + throws CertPathBuilderException, InvalidAlgorithmParameterException { | |
| 130 | + | |
| 131 | + if (debug != null) { | |
| 132 | + debug.println("SunCertPathBuilder.engineBuild(" + params + ")"); | |
| 133 | + } | |
| 134 | + | |
| 135 | + if (!(params instanceof PKIXBuilderParameters)) { | |
| 136 | + throw new InvalidAlgorithmParameterException("inappropriate " + | |
| 137 | + "parameter type, must be an instance of PKIXBuilderParameters"); | |
| 138 | + } | |
| 139 | + | |
| 140 | + boolean buildForward = true; | |
| 141 | + if (params instanceof SunCertPathBuilderParameters) { | |
| 142 | + buildForward = | |
| 143 | + ((SunCertPathBuilderParameters)params).getBuildForward(); | |
| 144 | + } | |
| 145 | + | |
| 146 | + buildParams = (PKIXBuilderParameters)params; | |
| 147 | + | |
| 148 | + /* Check mandatory parameters */ | |
| 149 | + | |
| 150 | + // Make sure that none of the trust anchors include name constraints | |
| 151 | + // (not supported). | |
| 152 | + for (TrustAnchor anchor : buildParams.getTrustAnchors()) { | |
| 153 | + if (anchor.getNameConstraints() != null) { | |
| 154 | + throw new InvalidAlgorithmParameterException | |
| 155 | + ("name constraints in trust anchor not supported"); | |
| 156 | + } | |
| 157 | + } | |
| 158 | + | |
| 159 | + CertSelector sel = buildParams.getTargetCertConstraints(); | |
| 160 | + if (!(sel instanceof X509CertSelector)) { | |
| 161 | + throw new InvalidAlgorithmParameterException("the " | |
| 162 | + + "targetCertConstraints parameter must be an " | |
| 163 | + + "X509CertSelector"); | |
| 164 | + } | |
| 165 | + targetSel = (X509CertSelector)sel; | |
| 166 | + targetSubjectDN = targetSel.getSubject(); | |
| 167 | + if (targetSubjectDN == null) { | |
| 168 | + X509Certificate targetCert = targetSel.getCertificate(); | |
| 169 | + if (targetCert != null) { | |
| 170 | + targetSubjectDN = targetCert.getSubjectX500Principal(); | |
| 171 | + } | |
| 172 | + } | |
| 173 | + // reorder CertStores so that local CertStores are tried first | |
| 174 | + orderedCertStores = | |
| 175 | + new ArrayList<CertStore>(buildParams.getCertStores()); | |
| 176 | + Collections.sort(orderedCertStores, new CertStoreComparator()); | |
| 177 | + if (targetSubjectDN == null) { | |
| 178 | + targetSubjectDN = getTargetSubjectDN(orderedCertStores, targetSel); | |
| 179 | + } | |
| 180 | + if (targetSubjectDN == null) { | |
| 181 | + throw new InvalidAlgorithmParameterException | |
| 182 | + ("Could not determine unique target subject"); | |
| 183 | + } | |
| 184 | + | |
| 185 | + List<List<Vertex>> adjList = new ArrayList<List<Vertex>>(); | |
| 186 | + CertPathBuilderResult result = | |
| 187 | + buildCertPath(buildForward, false, adjList); | |
| 188 | + if (result == null) { | |
| 189 | + if (debug != null) { | |
| 190 | + debug.println("SunCertPathBuilder.engineBuild: 2nd pass"); | |
| 191 | + } | |
| 192 | + // try again | |
| 193 | + adjList.clear(); | |
| 194 | + result = buildCertPath(buildForward, true, adjList); | |
| 195 | + if (result == null) { | |
| 196 | + throw new SunCertPathBuilderException("unable to find valid " | |
| 197 | + + "certification path to requested target", | |
| 198 | + new AdjacencyList(adjList)); | |
| 199 | + } | |
| 200 | + } | |
| 201 | + return result; | |
| 202 | + } | |
| 203 | + | |
| 204 | + private CertPathBuilderResult buildCertPath(boolean buildForward, | |
| 205 | + boolean searchAllCertStores, List<List<Vertex>> adjList) | |
| 206 | + throws CertPathBuilderException { | |
| 207 | + | |
| 208 | + // Init shared variables and build certification path | |
| 209 | + pathCompleted = false; | |
| 210 | + trustAnchor = null; | |
| 211 | + finalPublicKey = null; | |
| 212 | + policyTreeResult = null; | |
| 213 | + LinkedList<X509Certificate> certPathList = | |
| 214 | + new LinkedList<X509Certificate>(); | |
| 215 | + try { | |
| 216 | + if (buildForward) { | |
| 217 | + buildForward(adjList, certPathList, searchAllCertStores); | |
| 218 | + } else { | |
| 219 | + buildReverse(adjList, certPathList); | |
| 220 | + } | |
| 221 | + } catch (Exception e) { | |
| 222 | + if (debug != null) { | |
| 223 | + debug.println("SunCertPathBuilder.engineBuild() exception in " | |
| 224 | + + "build"); | |
| 225 | + e.printStackTrace(); | |
| 226 | + } | |
| 227 | + throw new SunCertPathBuilderException("unable to find valid " | |
| 228 | + + "certification path to requested target", e, | |
| 229 | + new AdjacencyList(adjList)); | |
| 230 | + } | |
| 231 | + | |
| 232 | + // construct SunCertPathBuilderResult | |
| 233 | + try { | |
| 234 | + if (pathCompleted) { | |
| 235 | + if (debug != null) | |
| 236 | + debug.println("SunCertPathBuilder.engineBuild() " | |
| 237 | + + "pathCompleted"); | |
| 238 | + | |
| 239 | + // we must return a certpath which has the target | |
| 240 | + // as the first cert in the certpath - i.e. reverse | |
| 241 | + // the certPathList | |
| 242 | + Collections.reverse(certPathList); | |
| 243 | + | |
| 244 | + return new SunCertPathBuilderResult( | |
| 245 | + cf.generateCertPath(certPathList), this.trustAnchor, | |
| 246 | + policyTreeResult, finalPublicKey, | |
| 247 | + new AdjacencyList(adjList)); | |
| 248 | + } | |
| 249 | + } catch (Exception e) { | |
| 250 | + if (debug != null) { | |
| 251 | + debug.println("SunCertPathBuilder.engineBuild() exception " | |
| 252 | + + "in wrap-up"); | |
| 253 | + e.printStackTrace(); | |
| 254 | + } | |
| 255 | + throw new SunCertPathBuilderException("unable to find valid " | |
| 256 | + + "certification path to requested target", e, | |
| 257 | + new AdjacencyList(adjList)); | |
| 258 | + } | |
| 259 | + | |
| 260 | + return null; | |
| 261 | + } | |
| 262 | + | |
| 263 | + /* | |
| 264 | + * Private build reverse method. | |
| 265 | + */ | |
| 266 | + private void buildReverse(List<List<Vertex>> adjacencyList, | |
| 267 | + LinkedList<X509Certificate> certPathList) throws Exception | |
| 268 | + { | |
| 269 | + if (debug != null) { | |
| 270 | + debug.println("SunCertPathBuilder.buildReverse()..."); | |
| 271 | + debug.println("SunCertPathBuilder.buildReverse() InitialPolicies: " | |
| 272 | + + buildParams.getInitialPolicies()); | |
| 273 | + } | |
| 274 | + | |
| 275 | + ReverseState currentState = new ReverseState(); | |
| 276 | + /* Initialize adjacency list */ | |
| 277 | + adjacencyList.clear(); | |
| 278 | + adjacencyList.add(new LinkedList<Vertex>()); | |
| 279 | + | |
| 280 | + /* | |
| 281 | + * Perform a search using each trust anchor, until a valid | |
| 282 | + * path is found | |
| 283 | + */ | |
| 284 | + Iterator<TrustAnchor> iter = buildParams.getTrustAnchors().iterator(); | |
| 285 | + while (iter.hasNext()) { | |
| 286 | + TrustAnchor anchor = iter.next(); | |
| 287 | + /* check if anchor satisfies target constraints */ | |
| 288 | + if (anchorIsTarget(anchor, targetSel)) { | |
| 289 | + this.trustAnchor = anchor; | |
| 290 | + this.pathCompleted = true; | |
| 291 | + this.finalPublicKey = anchor.getTrustedCert().getPublicKey(); | |
| 292 | + break; | |
| 293 | + } | |
| 294 | + | |
| 295 | + /* Initialize current state */ | |
| 296 | + currentState.initState(buildParams.getMaxPathLength(), | |
| 297 | + buildParams.isExplicitPolicyRequired(), | |
| 298 | + buildParams.isPolicyMappingInhibited(), | |
| 299 | + buildParams.isAnyPolicyInhibited(), | |
| 300 | + buildParams.getCertPathCheckers()); | |
| 301 | + currentState.updateState(anchor); | |
| 302 | + // init the crl checker | |
| 303 | + currentState.crlChecker = | |
| 304 | + new CrlRevocationChecker(null, buildParams, null, onlyEECert); | |
| 305 | + currentState.algorithmChecker = new AlgorithmChecker(anchor); | |
| 306 | + try { | |
| 307 | + depthFirstSearchReverse(null, currentState, | |
| 308 | + new ReverseBuilder(buildParams, targetSubjectDN), adjacencyList, | |
| 309 | + certPathList); | |
| 310 | + } catch (Exception e) { | |
| 311 | + // continue on error if more anchors to try | |
| 312 | + if (iter.hasNext()) | |
| 313 | + continue; | |
| 314 | + else | |
| 315 | + throw e; | |
| 316 | + } | |
| 317 | + | |
| 318 | + // break out of loop if search is successful | |
| 319 | + break; | |
| 320 | + } | |
| 321 | + | |
| 322 | + if (debug != null) { | |
| 323 | + debug.println("SunCertPathBuilder.buildReverse() returned from " | |
| 324 | + + "depthFirstSearchReverse()"); | |
| 325 | + debug.println("SunCertPathBuilder.buildReverse() " | |
| 326 | + + "certPathList.size: " + certPathList.size()); | |
| 327 | + } | |
| 328 | + } | |
| 329 | + | |
| 330 | + /* | |
| 331 | + * Private build forward method. | |
| 332 | + */ | |
| 333 | + private void buildForward(List<List<Vertex>> adjacencyList, | |
| 334 | + LinkedList<X509Certificate> certPathList, boolean searchAllCertStores) | |
| 335 | + throws GeneralSecurityException, IOException | |
| 336 | + { | |
| 337 | + if (debug != null) { | |
| 338 | + debug.println("SunCertPathBuilder.buildForward()..."); | |
| 339 | + } | |
| 340 | + | |
| 341 | + /* Initialize current state */ | |
| 342 | + ForwardState currentState = new ForwardState(); | |
| 343 | + currentState.initState(buildParams.getCertPathCheckers()); | |
| 344 | + | |
| 345 | + /* Initialize adjacency list */ | |
| 346 | + adjacencyList.clear(); | |
| 347 | + adjacencyList.add(new LinkedList<Vertex>()); | |
| 348 | + | |
| 349 | + // init the crl checker | |
| 350 | + currentState.crlChecker | |
| 351 | + = new CrlRevocationChecker(null, buildParams, null, onlyEECert); | |
| 352 | + | |
| 353 | + depthFirstSearchForward(targetSubjectDN, currentState, | |
| 354 | + new ForwardBuilder | |
| 355 | + (buildParams, targetSubjectDN, searchAllCertStores, onlyEECert), | |
| 356 | + adjacencyList, certPathList); | |
| 357 | + } | |
| 358 | + | |
| 359 | + /* | |
| 360 | + * This method performs a depth first search for a certification | |
| 361 | + * path while building forward which meets the requirements set in | |
| 362 | + * the parameters object. | |
| 363 | + * It uses an adjacency list to store all certificates which were | |
| 364 | + * tried (i.e. at one time added to the path - they may not end up in | |
| 365 | + * the final path if backtracking occurs). This information can | |
| 366 | + * be used later to debug or demo the build. | |
| 367 | + * | |
| 368 | + * See "Data Structure and Algorithms, by Aho, Hopcroft, and Ullman" | |
| 369 | + * for an explanation of the DFS algorithm. | |
| 370 | + * | |
| 371 | + * @param dN the distinguished name being currently searched for certs | |
| 372 | + * @param currentState the current PKIX validation state | |
| 373 | + */ | |
| 374 | + void depthFirstSearchForward(X500Principal dN, ForwardState currentState, | |
| 375 | + ForwardBuilder builder, List<List<Vertex>> adjList, | |
| 376 | + LinkedList<X509Certificate> certPathList) | |
| 377 | + throws GeneralSecurityException, IOException | |
| 378 | + { | |
| 379 | + //XXX This method should probably catch & handle exceptions | |
| 380 | + | |
| 381 | + if (debug != null) { | |
| 382 | + debug.println("SunCertPathBuilder.depthFirstSearchForward(" + dN | |
| 383 | + + ", " + currentState.toString() + ")"); | |
| 384 | + } | |
| 385 | + | |
| 386 | + /* | |
| 387 | + * Find all the certificates issued to dN which | |
| 388 | + * satisfy the PKIX certification path constraints. | |
| 389 | + */ | |
| 390 | + List<Vertex> vertices = addVertices | |
| 391 | + (builder.getMatchingCerts(currentState, orderedCertStores), adjList); | |
| 392 | + if (debug != null) { | |
| 393 | + debug.println("SunCertPathBuilder.depthFirstSearchForward(): " | |
| 394 | + + "certs.size=" + vertices.size()); | |
| 395 | + } | |
| 396 | + | |
| 397 | + /* | |
| 398 | + * For each cert in the collection, verify anything | |
| 399 | + * that hasn't been checked yet (signature, revocation, etc) | |
| 400 | + * and check for loops. Call depthFirstSearchForward() | |
| 401 | + * recursively for each good cert. | |
| 402 | + */ | |
| 403 | + | |
| 404 | + vertices: | |
| 405 | + for (Vertex vertex : vertices) { | |
| 406 | + /** | |
| 407 | + * Restore state to currentState each time through the loop. | |
| 408 | + * This is important because some of the user-defined | |
| 409 | + * checkers modify the state, which MUST be restored if | |
| 410 | + * the cert eventually fails to lead to the target and | |
| 411 | + * the next matching cert is tried. | |
| 412 | + */ | |
| 413 | + ForwardState nextState = (ForwardState) currentState.clone(); | |
| 414 | + X509Certificate cert = (X509Certificate) vertex.getCertificate(); | |
| 415 | + | |
| 416 | + try { | |
| 417 | + builder.verifyCert(cert, nextState, certPathList); | |
| 418 | + } catch (GeneralSecurityException gse) { | |
| 419 | + if (debug != null) { | |
| 420 | + debug.println("SunCertPathBuilder.depthFirstSearchForward()" | |
| 421 | + + ": validation failed: " + gse); | |
| 422 | + gse.printStackTrace(); | |
| 423 | + } | |
| 424 | + vertex.setThrowable(gse); | |
| 425 | + continue; | |
| 426 | + } | |
| 427 | + | |
| 428 | + /* | |
| 429 | + * Certificate is good. | |
| 430 | + * If cert completes the path, | |
| 431 | + * process userCheckers that don't support forward checking | |
| 432 | + * and process policies over whole path | |
| 433 | + * and backtrack appropriately if there is a failure | |
| 434 | + * else if cert does not complete the path, | |
| 435 | + * add it to the path | |
| 436 | + */ | |
| 437 | + if (builder.isPathCompleted(cert)) { | |
| 438 | + | |
| 439 | + BasicChecker basicChecker = null; | |
| 440 | + if (debug != null) | |
| 441 | + debug.println("SunCertPathBuilder.depthFirstSearchForward()" | |
| 442 | + + ": commencing final verification"); | |
| 443 | + | |
| 444 | + ArrayList<X509Certificate> appendedCerts = | |
| 445 | + new ArrayList<X509Certificate>(certPathList); | |
| 446 | + | |
| 447 | + /* | |
| 448 | + * if the trust anchor selected is specified as a trusted | |
| 449 | + * public key rather than a trusted cert, then verify this | |
| 450 | + * cert (which is signed by the trusted public key), but | |
| 451 | + * don't add it yet to the certPathList | |
| 452 | + */ | |
| 453 | + if (builder.trustAnchor.getTrustedCert() == null) { | |
| 454 | + appendedCerts.add(0, cert); | |
| 455 | + } | |
| 456 | + | |
| 457 | + HashSet<String> initExpPolSet = new HashSet<String>(1); | |
| 458 | + initExpPolSet.add(PolicyChecker.ANY_POLICY); | |
| 459 | + | |
| 460 | + PolicyNodeImpl rootNode = new PolicyNodeImpl(null, | |
| 461 | + PolicyChecker.ANY_POLICY, null, false, initExpPolSet, false); | |
| 462 | + | |
| 463 | + PolicyChecker policyChecker | |
| 464 | + = new PolicyChecker(buildParams.getInitialPolicies(), | |
| 465 | + appendedCerts.size(), | |
| 466 | + buildParams.isExplicitPolicyRequired(), | |
| 467 | + buildParams.isPolicyMappingInhibited(), | |
| 468 | + buildParams.isAnyPolicyInhibited(), | |
| 469 | + buildParams.getPolicyQualifiersRejected(), | |
| 470 | + rootNode); | |
| 471 | + | |
| 472 | + List<PKIXCertPathChecker> userCheckers = new | |
| 473 | + ArrayList<PKIXCertPathChecker> | |
| 474 | + (buildParams.getCertPathCheckers()); | |
| 475 | + int mustCheck = 0; | |
| 476 | + userCheckers.add(mustCheck, policyChecker); | |
| 477 | + mustCheck++; | |
| 478 | + | |
| 479 | + // add the algorithm checker | |
| 480 | + userCheckers.add(mustCheck, | |
| 481 | + new AlgorithmChecker(builder.trustAnchor)); | |
| 482 | + mustCheck++; | |
| 483 | + | |
| 484 | + if (nextState.keyParamsNeeded()) { | |
| 485 | + PublicKey rootKey = cert.getPublicKey(); | |
| 486 | + if (builder.trustAnchor.getTrustedCert() == null) { | |
| 487 | + rootKey = builder.trustAnchor.getCAPublicKey(); | |
| 488 | + if (debug != null) | |
| 489 | + debug.println( | |
| 490 | + "SunCertPathBuilder.depthFirstSearchForward " + | |
| 491 | + "using buildParams public key: " + | |
| 492 | + rootKey.toString()); | |
| 493 | + } | |
| 494 | + TrustAnchor anchor = new TrustAnchor | |
| 495 | + (cert.getSubjectX500Principal(), rootKey, null); | |
| 496 | + | |
| 497 | + // add the basic checker | |
| 498 | + basicChecker = new BasicChecker(anchor, | |
| 499 | + builder.date, | |
| 500 | + buildParams.getSigProvider(), | |
| 501 | + true); | |
| 502 | + userCheckers.add(mustCheck, basicChecker); | |
| 503 | + mustCheck++; | |
| 504 | + | |
| 505 | + // add the crl revocation checker | |
| 506 | + if (buildParams.isRevocationEnabled()) { | |
| 507 | + userCheckers.add(mustCheck, new CrlRevocationChecker | |
| 508 | + (anchor, buildParams, null, onlyEECert)); | |
| 509 | + mustCheck++; | |
| 510 | + } | |
| 511 | + } | |
| 512 | + // Why we don't need BasicChecker and CrlRevocationChecker | |
| 513 | + // if nextState.keyParamsNeeded() is false? | |
| 514 | + | |
| 515 | + for (int i=0; i<appendedCerts.size(); i++) { | |
| 516 | + X509Certificate currCert = appendedCerts.get(i); | |
| 517 | + if (debug != null) | |
| 518 | + debug.println("current subject = " | |
| 519 | + + currCert.getSubjectX500Principal()); | |
| 520 | + Set<String> unresCritExts = | |
| 521 | + currCert.getCriticalExtensionOIDs(); | |
| 522 | + if (unresCritExts == null) { | |
| 523 | + unresCritExts = Collections.<String>emptySet(); | |
| 524 | + } | |
| 525 | + | |
| 526 | + for (int j=0; j<userCheckers.size(); j++) { | |
| 527 | + PKIXCertPathChecker currChecker = userCheckers.get(j); | |
| 528 | + if (j < mustCheck || | |
| 529 | + !currChecker.isForwardCheckingSupported()) { | |
| 530 | + if (i == 0) { | |
| 531 | + currChecker.init(false); | |
| 532 | + | |
| 533 | + // The user specified | |
| 534 | + // AlgorithmChecker may not be | |
| 535 | + // able to set the trust anchor until now. | |
| 536 | + if (j >= mustCheck && | |
| 537 | + currChecker instanceof AlgorithmChecker) { | |
| 538 | + ((AlgorithmChecker)currChecker). | |
| 539 | + trySetTrustAnchor(builder.trustAnchor); | |
| 540 | + } | |
| 541 | + } | |
| 542 | + | |
| 543 | + try { | |
| 544 | + currChecker.check(currCert, unresCritExts); | |
| 545 | + } catch (CertPathValidatorException cpve) { | |
| 546 | + if (debug != null) | |
| 547 | + debug.println | |
| 548 | + ("SunCertPathBuilder.depthFirstSearchForward(): " + | |
| 549 | + "final verification failed: " + cpve); | |
| 550 | + vertex.setThrowable(cpve); | |
| 551 | + continue vertices; | |
| 552 | + } | |
| 553 | + } | |
| 554 | + } | |
| 555 | + | |
| 556 | + /* | |
| 557 | + * Remove extensions from user checkers that support | |
| 558 | + * forward checking. After this step, we will have | |
| 559 | + * removed all extensions that all user checkers | |
| 560 | + * are capable of processing. | |
| 561 | + */ | |
| 562 | + for (PKIXCertPathChecker checker : | |
| 563 | + buildParams.getCertPathCheckers()) | |
| 564 | + { | |
| 565 | + if (checker.isForwardCheckingSupported()) { | |
| 566 | + Set<String> suppExts = | |
| 567 | + checker.getSupportedExtensions(); | |
| 568 | + if (suppExts != null) { | |
| 569 | + unresCritExts.removeAll(suppExts); | |
| 570 | + } | |
| 571 | + } | |
| 572 | + } | |
| 573 | + | |
| 574 | + if (!unresCritExts.isEmpty()) { | |
| 575 | + unresCritExts.remove | |
| 576 | + (PKIXExtensions.BasicConstraints_Id.toString()); | |
| 577 | + unresCritExts.remove | |
| 578 | + (PKIXExtensions.NameConstraints_Id.toString()); | |
| 579 | + unresCritExts.remove | |
| 580 | + (PKIXExtensions.CertificatePolicies_Id.toString()); | |
| 581 | + unresCritExts.remove | |
| 582 | + (PKIXExtensions.PolicyMappings_Id.toString()); | |
| 583 | + unresCritExts.remove | |
| 584 | + (PKIXExtensions.PolicyConstraints_Id.toString()); | |
| 585 | + unresCritExts.remove | |
| 586 | + (PKIXExtensions.InhibitAnyPolicy_Id.toString()); | |
| 587 | + unresCritExts.remove(PKIXExtensions. | |
| 588 | + SubjectAlternativeName_Id.toString()); | |
| 589 | + unresCritExts.remove | |
| 590 | + (PKIXExtensions.KeyUsage_Id.toString()); | |
| 591 | + unresCritExts.remove | |
| 592 | + (PKIXExtensions.ExtendedKeyUsage_Id.toString()); | |
| 593 | + | |
| 594 | + if (!unresCritExts.isEmpty()) { | |
| 595 | + throw new CertPathValidatorException | |
| 596 | + ("unrecognized critical extension(s)", null, | |
| 597 | + null, -1, PKIXReason.UNRECOGNIZED_CRIT_EXT); | |
| 598 | + } | |
| 599 | + } | |
| 600 | + } | |
| 601 | + if (debug != null) | |
| 602 | + debug.println("SunCertPathBuilder.depthFirstSearchForward()" | |
| 603 | + + ": final verification succeeded - path completed!"); | |
| 604 | + pathCompleted = true; | |
| 605 | + | |
| 606 | + /* | |
| 607 | + * if the user specified a trusted public key rather than | |
| 608 | + * trusted certs, then add this cert (which is signed by | |
| 609 | + * the trusted public key) to the certPathList | |
| 610 | + */ | |
| 611 | + if (builder.trustAnchor.getTrustedCert() == null) | |
| 612 | + builder.addCertToPath(cert, certPathList); | |
| 613 | + // Save the trust anchor | |
| 614 | + this.trustAnchor = builder.trustAnchor; | |
| 615 | + | |
| 616 | + /* | |
| 617 | + * Extract and save the final target public key | |
| 618 | + */ | |
| 619 | + if (basicChecker != null) { | |
| 620 | + finalPublicKey = basicChecker.getPublicKey(); | |
| 621 | + } else { | |
| 622 | + Certificate finalCert; | |
| 623 | + if (certPathList.size() == 0) { | |
| 624 | + finalCert = builder.trustAnchor.getTrustedCert(); | |
| 625 | + } else { | |
| 626 | + finalCert = certPathList.get(certPathList.size()-1); | |
| 627 | + } | |
| 628 | + finalPublicKey = finalCert.getPublicKey(); | |
| 629 | + } | |
| 630 | + | |
| 631 | + policyTreeResult = policyChecker.getPolicyTree(); | |
| 632 | + return; | |
| 633 | + } else { | |
| 634 | + builder.addCertToPath(cert, certPathList); | |
| 635 | + } | |
| 636 | + | |
| 637 | + /* Update the PKIX state */ | |
| 638 | + nextState.updateState(cert); | |
| 639 | + | |
| 640 | + /* | |
| 641 | + * Append an entry for cert in adjacency list and | |
| 642 | + * set index for current vertex. | |
| 643 | + */ | |
| 644 | + adjList.add(new LinkedList<Vertex>()); | |
| 645 | + vertex.setIndex(adjList.size() - 1); | |
| 646 | + | |
| 647 | + /* recursively search for matching certs at next dN */ | |
| 648 | + depthFirstSearchForward(cert.getIssuerX500Principal(), nextState, builder, | |
| 649 | + adjList, certPathList); | |
| 650 | + | |
| 651 | + /* | |
| 652 | + * If path has been completed, return ASAP! | |
| 653 | + */ | |
| 654 | + if (pathCompleted) { | |
| 655 | + return; | |
| 656 | + } else { | |
| 657 | + /* | |
| 658 | + * If we get here, it means we have searched all possible | |
| 659 | + * certs issued by the dN w/o finding any matching certs. | |
| 660 | + * This means we have to backtrack to the previous cert in | |
| 661 | + * the path and try some other paths. | |
| 662 | + */ | |
| 663 | + if (debug != null) | |
| 664 | + debug.println("SunCertPathBuilder.depthFirstSearchForward()" | |
| 665 | + + ": backtracking"); | |
| 666 | + builder.removeFinalCertFromPath(certPathList); | |
| 667 | + } | |
| 668 | + } | |
| 669 | + } | |
| 670 | + | |
| 671 | + /* | |
| 672 | + * This method performs a depth first search for a certification | |
| 673 | + * path while building reverse which meets the requirements set in | |
| 674 | + * the parameters object. | |
| 675 | + * It uses an adjacency list to store all certificates which were | |
| 676 | + * tried (i.e. at one time added to the path - they may not end up in | |
| 677 | + * the final path if backtracking occurs). This information can | |
| 678 | + * be used later to debug or demo the build. | |
| 679 | + * | |
| 680 | + * See "Data Structure and Algorithms, by Aho, Hopcroft, and Ullman" | |
| 681 | + * for an explanation of the DFS algorithm. | |
| 682 | + * | |
| 683 | + * @param dN the distinguished name being currently searched for certs | |
| 684 | + * @param currentState the current PKIX validation state | |
| 685 | + */ | |
| 686 | + void depthFirstSearchReverse(X500Principal dN, ReverseState currentState, | |
| 687 | + ReverseBuilder builder, List<List<Vertex>> adjList, | |
| 688 | + LinkedList<X509Certificate> certPathList) | |
| 689 | + throws GeneralSecurityException, IOException | |
| 690 | + { | |
| 691 | + if (debug != null) | |
| 692 | + debug.println("SunCertPathBuilder.depthFirstSearchReverse(" + dN | |
| 693 | + + ", " + currentState.toString() + ")"); | |
| 694 | + | |
| 695 | + /* | |
| 696 | + * Find all the certificates issued by dN which | |
| 697 | + * satisfy the PKIX certification path constraints. | |
| 698 | + */ | |
| 699 | + List<Vertex> vertices = addVertices | |
| 700 | + (builder.getMatchingCerts(currentState, orderedCertStores), adjList); | |
| 701 | + if (debug != null) | |
| 702 | + debug.println("SunCertPathBuilder.depthFirstSearchReverse(): " | |
| 703 | + + "certs.size=" + vertices.size()); | |
| 704 | + | |
| 705 | + /* | |
| 706 | + * For each cert in the collection, verify anything | |
| 707 | + * that hasn't been checked yet (signature, revocation, etc) | |
| 708 | + * and check for loops. Call depthFirstSearchReverse() | |
| 709 | + * recursively for each good cert. | |
| 710 | + */ | |
| 711 | + for (Vertex vertex : vertices) { | |
| 712 | + /** | |
| 713 | + * Restore state to currentState each time through the loop. | |
| 714 | + * This is important because some of the user-defined | |
| 715 | + * checkers modify the state, which MUST be restored if | |
| 716 | + * the cert eventually fails to lead to the target and | |
| 717 | + * the next matching cert is tried. | |
| 718 | + */ | |
| 719 | + ReverseState nextState = (ReverseState) currentState.clone(); | |
| 720 | + X509Certificate cert = (X509Certificate) vertex.getCertificate(); | |
| 721 | + try { | |
| 722 | + builder.verifyCert(cert, nextState, certPathList); | |
| 723 | + } catch (GeneralSecurityException gse) { | |
| 724 | + if (debug != null) | |
| 725 | + debug.println("SunCertPathBuilder.depthFirstSearchReverse()" | |
| 726 | + + ": validation failed: " + gse); | |
| 727 | + vertex.setThrowable(gse); | |
| 728 | + continue; | |
| 729 | + } | |
| 730 | + | |
| 731 | + /* | |
| 732 | + * Certificate is good, add it to the path (if it isn't a | |
| 733 | + * self-signed cert) and update state | |
| 734 | + */ | |
| 735 | + if (!currentState.isInitial()) | |
| 736 | + builder.addCertToPath(cert, certPathList); | |
| 737 | + // save trust anchor | |
| 738 | + this.trustAnchor = currentState.trustAnchor; | |
| 739 | + | |
| 740 | + /* | |
| 741 | + * Check if path is completed, return ASAP if so. | |
| 742 | + */ | |
| 743 | + if (builder.isPathCompleted(cert)) { | |
| 744 | + if (debug != null) | |
| 745 | + debug.println("SunCertPathBuilder.depthFirstSearchReverse()" | |
| 746 | + + ": path completed!"); | |
| 747 | + pathCompleted = true; | |
| 748 | + | |
| 749 | + PolicyNodeImpl rootNode = nextState.rootNode; | |
| 750 | + | |
| 751 | + if (rootNode == null) | |
| 752 | + policyTreeResult = null; | |
| 753 | + else { | |
| 754 | + policyTreeResult = rootNode.copyTree(); | |
| 755 | + ((PolicyNodeImpl)policyTreeResult).setImmutable(); | |
| 756 | + } | |
| 757 | + | |
| 758 | + /* | |
| 759 | + * Extract and save the final target public key | |
| 760 | + */ | |
| 761 | + finalPublicKey = cert.getPublicKey(); | |
| 762 | + if (finalPublicKey instanceof DSAPublicKey && | |
| 763 | + ((DSAPublicKey)finalPublicKey).getParams() == null) | |
| 764 | + { | |
| 765 | + finalPublicKey = | |
| 766 | + BasicChecker.makeInheritedParamsKey | |
| 767 | + (finalPublicKey, currentState.pubKey); | |
| 768 | + } | |
| 769 | + | |
| 770 | + return; | |
| 771 | + } | |
| 772 | + | |
| 773 | + /* Update the PKIX state */ | |
| 774 | + nextState.updateState(cert); | |
| 775 | + | |
| 776 | + /* | |
| 777 | + * Append an entry for cert in adjacency list and | |
| 778 | + * set index for current vertex. | |
| 779 | + */ | |
| 780 | + adjList.add(new LinkedList<Vertex>()); | |
| 781 | + vertex.setIndex(adjList.size() - 1); | |
| 782 | + | |
| 783 | + /* recursively search for matching certs at next dN */ | |
| 784 | + depthFirstSearchReverse(cert.getSubjectX500Principal(), nextState, | |
| 785 | + builder, adjList, certPathList); | |
| 786 | + | |
| 787 | + /* | |
| 788 | + * If path has been completed, return ASAP! | |
| 789 | + */ | |
| 790 | + if (pathCompleted) { | |
| 791 | + return; | |
| 792 | + } else { | |
| 793 | + /* | |
| 794 | + * If we get here, it means we have searched all possible | |
| 795 | + * certs issued by the dN w/o finding any matching certs. This | |
| 796 | + * means we have to backtrack to the previous cert in the path | |
| 797 | + * and try some other paths. | |
| 798 | + */ | |
| 799 | + if (debug != null) | |
| 800 | + debug.println("SunCertPathBuilder.depthFirstSearchReverse()" | |
| 801 | + + ": backtracking"); | |
| 802 | + if (!currentState.isInitial()) | |
| 803 | + builder.removeFinalCertFromPath(certPathList); | |
| 804 | + } | |
| 805 | + } | |
| 806 | + if (debug != null) | |
| 807 | + debug.println("SunCertPathBuilder.depthFirstSearchReverse() all " | |
| 808 | + + "certs in this adjacency list checked"); | |
| 809 | + } | |
| 810 | + | |
| 811 | + /* | |
| 812 | + * Adds a collection of matching certificates to the | |
| 813 | + * adjacency list. | |
| 814 | + */ | |
| 815 | + private List<Vertex> addVertices(Collection<X509Certificate> certs, | |
| 816 | + List<List<Vertex>> adjList) { | |
| 817 | + List<Vertex> l = adjList.get(adjList.size() - 1); | |
| 818 | + | |
| 819 | + for (X509Certificate cert : certs) { | |
| 820 | + Vertex v = new Vertex(cert); | |
| 821 | + l.add(v); | |
| 822 | + } | |
| 823 | + | |
| 824 | + return l; | |
| 825 | + } | |
| 826 | + | |
| 827 | + /** | |
| 828 | + * Returns true if trust anchor certificate matches specified | |
| 829 | + * certificate constraints. | |
| 830 | + */ | |
| 831 | + private boolean anchorIsTarget(TrustAnchor anchor, X509CertSelector sel) { | |
| 832 | + X509Certificate anchorCert = anchor.getTrustedCert(); | |
| 833 | + if (anchorCert != null) { | |
| 834 | + return sel.match(anchorCert); | |
| 835 | + } | |
| 836 | + return false; | |
| 837 | + } | |
| 838 | + | |
| 839 | + /** | |
| 840 | + * Comparator that orders CertStores so that local CertStores come before | |
| 841 | + * remote CertStores. | |
| 842 | + */ | |
| 843 | + private static class CertStoreComparator implements Comparator<CertStore> { | |
| 844 | + public int compare(CertStore store1, CertStore store2) { | |
| 845 | + if (Builder.isLocalCertStore(store1)) { | |
| 846 | + return -1; | |
| 847 | + } else { | |
| 848 | + return 1; | |
| 849 | + } | |
| 850 | + } | |
| 851 | + } | |
| 852 | + | |
| 853 | + /** | |
| 854 | + * Returns the target subject DN from the first X509Certificate that | |
| 855 | + * is fetched that matches the specified X509CertSelector. | |
| 856 | + */ | |
| 857 | + private X500Principal getTargetSubjectDN(List<CertStore> stores, | |
| 858 | + X509CertSelector targetSel) { | |
| 859 | + for (CertStore store : stores) { | |
| 860 | + try { | |
| 861 | + Collection<? extends Certificate> targetCerts = | |
| 862 | + (Collection<? extends Certificate>) | |
| 863 | + store.getCertificates(targetSel); | |
| 864 | + if (!targetCerts.isEmpty()) { | |
| 865 | + X509Certificate targetCert = | |
| 866 | + (X509Certificate)targetCerts.iterator().next(); | |
| 867 | + return targetCert.getSubjectX500Principal(); | |
| 868 | + } | |
| 869 | + } catch (CertStoreException e) { | |
| 870 | + // ignore but log it | |
| 871 | + if (debug != null) { | |
| 872 | + debug.println("SunCertPathBuilder.getTargetSubjectDN: " + | |
| 873 | + "non-fatal exception retrieving certs: " + e); | |
| 874 | + e.printStackTrace(); | |
| 875 | + } | |
| 876 | + } | |
| 877 | + } | |
| 878 | + return null; | |
| 879 | + } | |
| 880 | +} | |