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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 | } | ||