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| 1 | +/* | |
| 2 | + * Copyright (c) 2000, 2008, 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.util.Collection; | |
| 29 | +import java.util.Collections; | |
| 30 | +import java.util.Set; | |
| 31 | +import java.util.HashSet; | |
| 32 | +import java.io.IOException; | |
| 33 | +import java.security.cert.Certificate; | |
| 34 | +import java.security.cert.CertificateException; | |
| 35 | +import java.security.cert.CertPathValidatorException; | |
| 36 | +import java.security.cert.X509Certificate; | |
| 37 | +import java.security.cert.PKIXCertPathChecker; | |
| 38 | +import java.security.cert.PKIXReason; | |
| 39 | +import sun.security.util.Debug; | |
| 40 | +import sun.security.x509.PKIXExtensions; | |
| 41 | +import sun.security.x509.NameConstraintsExtension; | |
| 42 | +import sun.security.x509.X509CertImpl; | |
| 43 | + | |
| 44 | +/** | |
| 45 | + * ConstraintsChecker is a <code>PKIXCertPathChecker</code> that checks | |
| 46 | + * constraints information on a PKIX certificate, namely basic constraints | |
| 47 | + * and name constraints. | |
| 48 | + * | |
| 49 | + * @since 1.4 | |
| 50 | + * @author Yassir Elley | |
| 51 | + */ | |
| 52 | +class ConstraintsChecker extends PKIXCertPathChecker { | |
| 53 | + | |
| 54 | + private static final Debug debug = Debug.getInstance("certpath"); | |
| 55 | + /* length of cert path */ | |
| 56 | + private final int certPathLength; | |
| 57 | + /* current maximum path length (as defined in PKIX) */ | |
| 58 | + private int maxPathLength; | |
| 59 | + /* current index of cert */ | |
| 60 | + private int i; | |
| 61 | + private NameConstraintsExtension prevNC; | |
| 62 | + | |
| 63 | + private Set<String> supportedExts; | |
| 64 | + | |
| 65 | + /** | |
| 66 | + * Creates a ConstraintsChecker. | |
| 67 | + * | |
| 68 | + * @param certPathLength the length of the certification path | |
| 69 | + * @throws CertPathValidatorException if the checker cannot be initialized | |
| 70 | + */ | |
| 71 | + ConstraintsChecker(int certPathLength) throws CertPathValidatorException { | |
| 72 | + this.certPathLength = certPathLength; | |
| 73 | + init(false); | |
| 74 | + } | |
| 75 | + | |
| 76 | + public void init(boolean forward) throws CertPathValidatorException { | |
| 77 | + if (!forward) { | |
| 78 | + i = 0; | |
| 79 | + maxPathLength = certPathLength; | |
| 80 | + prevNC = null; | |
| 81 | + } else { | |
| 82 | + throw new CertPathValidatorException | |
| 83 | + ("forward checking not supported"); | |
| 84 | + } | |
| 85 | + } | |
| 86 | + | |
| 87 | + public boolean isForwardCheckingSupported() { | |
| 88 | + return false; | |
| 89 | + } | |
| 90 | + | |
| 91 | + public Set<String> getSupportedExtensions() { | |
| 92 | + if (supportedExts == null) { | |
| 93 | + supportedExts = new HashSet<String>(); | |
| 94 | + supportedExts.add(PKIXExtensions.BasicConstraints_Id.toString()); | |
| 95 | + supportedExts.add(PKIXExtensions.NameConstraints_Id.toString()); | |
| 96 | + supportedExts = Collections.unmodifiableSet(supportedExts); | |
| 97 | + } | |
| 98 | + return supportedExts; | |
| 99 | + } | |
| 100 | + | |
| 101 | + /** | |
| 102 | + * Performs the basic constraints and name constraints | |
| 103 | + * checks on the certificate using its internal state. | |
| 104 | + * | |
| 105 | + * @param cert the <code>Certificate</code> to be checked | |
| 106 | + * @param unresCritExts a <code>Collection</code> of OID strings | |
| 107 | + * representing the current set of unresolved critical extensions | |
| 108 | + * @throws CertPathValidatorException if the specified certificate | |
| 109 | + * does not pass the check | |
| 110 | + */ | |
| 111 | + public void check(Certificate cert, Collection<String> unresCritExts) | |
| 112 | + throws CertPathValidatorException | |
| 113 | + { | |
| 114 | + X509Certificate currCert = (X509Certificate) cert; | |
| 115 | + | |
| 116 | + i++; | |
| 117 | + // MUST run NC check second, since it depends on BC check to | |
| 118 | + // update remainingCerts | |
| 119 | + checkBasicConstraints(currCert); | |
| 120 | + verifyNameConstraints(currCert); | |
| 121 | + | |
| 122 | + if (unresCritExts != null && !unresCritExts.isEmpty()) { | |
| 123 | + unresCritExts.remove(PKIXExtensions.BasicConstraints_Id.toString()); | |
| 124 | + unresCritExts.remove(PKIXExtensions.NameConstraints_Id.toString()); | |
| 125 | + } | |
| 126 | + } | |
| 127 | + | |
| 128 | + /** | |
| 129 | + * Internal method to check the name constraints against a cert | |
| 130 | + */ | |
| 131 | + private void verifyNameConstraints(X509Certificate currCert) | |
| 132 | + throws CertPathValidatorException | |
| 133 | + { | |
| 134 | + String msg = "name constraints"; | |
| 135 | + if (debug != null) { | |
| 136 | + debug.println("---checking " + msg + "..."); | |
| 137 | + } | |
| 138 | + | |
| 139 | + // check name constraints only if there is a previous name constraint | |
| 140 | + // and either the currCert is the final cert or the currCert is not | |
| 141 | + // self-issued | |
| 142 | + if (prevNC != null && ((i == certPathLength) || | |
| 143 | + !X509CertImpl.isSelfIssued(currCert))) { | |
| 144 | + if (debug != null) { | |
| 145 | + debug.println("prevNC = " + prevNC); | |
| 146 | + debug.println("currDN = " + currCert.getSubjectX500Principal()); | |
| 147 | + } | |
| 148 | + | |
| 149 | + try { | |
| 150 | + if (!prevNC.verify(currCert)) { | |
| 151 | + throw new CertPathValidatorException(msg + " check failed", | |
| 152 | + null, null, -1, PKIXReason.INVALID_NAME); | |
| 153 | + } | |
| 154 | + } catch (IOException ioe) { | |
| 155 | + throw new CertPathValidatorException(ioe); | |
| 156 | + } | |
| 157 | + } | |
| 158 | + | |
| 159 | + // merge name constraints regardless of whether cert is self-issued | |
| 160 | + prevNC = mergeNameConstraints(currCert, prevNC); | |
| 161 | + | |
| 162 | + if (debug != null) | |
| 163 | + debug.println(msg + " verified."); | |
| 164 | + } | |
| 165 | + | |
| 166 | + /** | |
| 167 | + * Helper to fold sets of name constraints together | |
| 168 | + */ | |
| 169 | + static NameConstraintsExtension | |
| 170 | + mergeNameConstraints(X509Certificate currCert, | |
| 171 | + NameConstraintsExtension prevNC) throws CertPathValidatorException | |
| 172 | + { | |
| 173 | + X509CertImpl currCertImpl; | |
| 174 | + try { | |
| 175 | + currCertImpl = X509CertImpl.toImpl(currCert); | |
| 176 | + } catch (CertificateException ce) { | |
| 177 | + throw new CertPathValidatorException(ce); | |
| 178 | + } | |
| 179 | + | |
| 180 | + NameConstraintsExtension newConstraints = | |
| 181 | + currCertImpl.getNameConstraintsExtension(); | |
| 182 | + | |
| 183 | + if (debug != null) { | |
| 184 | + debug.println("prevNC = " + prevNC); | |
| 185 | + debug.println("newNC = " + String.valueOf(newConstraints)); | |
| 186 | + } | |
| 187 | + | |
| 188 | + // if there are no previous name constraints, we just return the | |
| 189 | + // new name constraints. | |
| 190 | + if (prevNC == null) { | |
| 191 | + if (debug != null) { | |
| 192 | + debug.println("mergedNC = " + String.valueOf(newConstraints)); | |
| 193 | + } | |
| 194 | + if (newConstraints == null) { | |
| 195 | + return newConstraints; | |
| 196 | + } else { | |
| 197 | + // Make sure we do a clone here, because we're probably | |
| 198 | + // going to modify this object later and we don't want to | |
| 199 | + // be sharing it with a Certificate object! | |
| 200 | + return (NameConstraintsExtension) newConstraints.clone(); | |
| 201 | + } | |
| 202 | + } else { | |
| 203 | + try { | |
| 204 | + // after merge, prevNC should contain the merged constraints | |
| 205 | + prevNC.merge(newConstraints); | |
| 206 | + } catch (IOException ioe) { | |
| 207 | + throw new CertPathValidatorException(ioe); | |
| 208 | + } | |
| 209 | + if (debug != null) { | |
| 210 | + debug.println("mergedNC = " + prevNC); | |
| 211 | + } | |
| 212 | + return prevNC; | |
| 213 | + } | |
| 214 | + } | |
| 215 | + | |
| 216 | + /** | |
| 217 | + * Internal method to check that a given cert meets basic constraints. | |
| 218 | + */ | |
| 219 | + private void checkBasicConstraints(X509Certificate currCert) | |
| 220 | + throws CertPathValidatorException | |
| 221 | + { | |
| 222 | + String msg = "basic constraints"; | |
| 223 | + if (debug != null) { | |
| 224 | + debug.println("---checking " + msg + "..."); | |
| 225 | + debug.println("i = " + i); | |
| 226 | + debug.println("maxPathLength = " + maxPathLength); | |
| 227 | + } | |
| 228 | + | |
| 229 | + /* check if intermediate cert */ | |
| 230 | + if (i < certPathLength) { | |
| 231 | + // RFC5280: If certificate i is a version 3 certificate, verify | |
| 232 | + // that the basicConstraints extension is present and that cA is | |
| 233 | + // set to TRUE. (If certificate i is a version 1 or version 2 | |
| 234 | + // certificate, then the application MUST either verify that | |
| 235 | + // certificate i is a CA certificate through out-of-band means | |
| 236 | + // or reject the certificate. Conforming implementations may | |
| 237 | + // choose to reject all version 1 and version 2 intermediate | |
| 238 | + // certificates.) | |
| 239 | + // | |
| 240 | + // We choose to reject all version 1 and version 2 intermediate | |
| 241 | + // certificates except that it is self issued by the trust | |
| 242 | + // anchor in order to support key rollover or changes in | |
| 243 | + // certificate policies. | |
| 244 | + int pathLenConstraint = -1; | |
| 245 | + if (currCert.getVersion() < 3) { // version 1 or version 2 | |
| 246 | + if (i == 1) { // issued by a trust anchor | |
| 247 | + if (X509CertImpl.isSelfIssued(currCert)) { | |
| 248 | + pathLenConstraint = Integer.MAX_VALUE; | |
| 249 | + } | |
| 250 | + } | |
| 251 | + } else { | |
| 252 | + pathLenConstraint = currCert.getBasicConstraints(); | |
| 253 | + } | |
| 254 | + | |
| 255 | + if (pathLenConstraint == -1) { | |
| 256 | + throw new CertPathValidatorException | |
| 257 | + (msg + " check failed: this is not a CA certificate", | |
| 258 | + null, null, -1, PKIXReason.NOT_CA_CERT); | |
| 259 | + } | |
| 260 | + | |
| 261 | + if (!X509CertImpl.isSelfIssued(currCert)) { | |
| 262 | + if (maxPathLength <= 0) { | |
| 263 | + throw new CertPathValidatorException | |
| 264 | + (msg + " check failed: pathLenConstraint violated - " | |
| 265 | + + "this cert must be the last cert in the " | |
| 266 | + + "certification path", null, null, -1, | |
| 267 | + PKIXReason.PATH_TOO_LONG); | |
| 268 | + } | |
| 269 | + maxPathLength--; | |
| 270 | + } | |
| 271 | + if (pathLenConstraint < maxPathLength) | |
| 272 | + maxPathLength = pathLenConstraint; | |
| 273 | + } | |
| 274 | + | |
| 275 | + if (debug != null) { | |
| 276 | + debug.println("after processing, maxPathLength = " + maxPathLength); | |
| 277 | + debug.println(msg + " verified."); | |
| 278 | + } | |
| 279 | + } | |
| 280 | + | |
| 281 | + /** | |
| 282 | + * Merges the specified maxPathLength with the pathLenConstraint | |
| 283 | + * obtained from the certificate. | |
| 284 | + * | |
| 285 | + * @param cert the <code>X509Certificate</code> | |
| 286 | + * @param maxPathLength the previous maximum path length | |
| 287 | + * @return the new maximum path length constraint (-1 means no more | |
| 288 | + * certificates can follow, Integer.MAX_VALUE means path length is | |
| 289 | + * unconstrained) | |
| 290 | + */ | |
| 291 | + static int mergeBasicConstraints(X509Certificate cert, int maxPathLength) { | |
| 292 | + | |
| 293 | + int pathLenConstraint = cert.getBasicConstraints(); | |
| 294 | + | |
| 295 | + if (!X509CertImpl.isSelfIssued(cert)) { | |
| 296 | + maxPathLength--; | |
| 297 | + } | |
| 298 | + | |
| 299 | + if (pathLenConstraint < maxPathLength) { | |
| 300 | + maxPathLength = pathLenConstraint; | |
| 301 | + } | |
| 302 | + | |
| 303 | + return maxPathLength; | |
| 304 | + } | |
| 305 | +} | |