2
|
1 |
/*
|
|
2 |
* Copyright 2000-2006 Sun Microsystems, Inc. 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. Sun designates this
|
|
8 |
* particular file as subject to the "Classpath" exception as provided
|
|
9 |
* by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
|
|
22 |
* CA 95054 USA or visit www.sun.com if you need additional information or
|
|
23 |
* have any 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.X509Certificate;
|
|
36 |
import java.security.cert.PKIXCertPathChecker;
|
|
37 |
import java.security.cert.CertPathValidatorException;
|
|
38 |
import sun.security.util.Debug;
|
|
39 |
import sun.security.x509.PKIXExtensions;
|
|
40 |
import sun.security.x509.NameConstraintsExtension;
|
|
41 |
import sun.security.x509.X509CertImpl;
|
|
42 |
|
|
43 |
/**
|
|
44 |
* ConstraintsChecker is a <code>PKIXCertPathChecker</code> that checks
|
|
45 |
* constraints information on a PKIX certificate, namely basic constraints
|
|
46 |
* and name constraints.
|
|
47 |
*
|
|
48 |
* @since 1.4
|
|
49 |
* @author Yassir Elley
|
|
50 |
*/
|
|
51 |
class ConstraintsChecker extends PKIXCertPathChecker {
|
|
52 |
|
|
53 |
private static final Debug debug = Debug.getInstance("certpath");
|
|
54 |
/* length of cert path */
|
|
55 |
private final int certPathLength;
|
|
56 |
/* current maximum path length (as defined in PKIX) */
|
|
57 |
private int maxPathLength;
|
|
58 |
/* current index of cert */
|
|
59 |
private int i;
|
|
60 |
private NameConstraintsExtension prevNC;
|
|
61 |
|
|
62 |
private static Set<String> supportedExts;
|
|
63 |
|
|
64 |
/**
|
|
65 |
* Creates a ConstraintsChecker.
|
|
66 |
*
|
|
67 |
* @param certPathLength the length of the certification path
|
|
68 |
* @throws CertPathValidatorException if the checker cannot be initialized
|
|
69 |
*/
|
|
70 |
ConstraintsChecker(int certPathLength) throws CertPathValidatorException {
|
|
71 |
this.certPathLength = certPathLength;
|
|
72 |
init(false);
|
|
73 |
}
|
|
74 |
|
|
75 |
public void init(boolean forward) throws CertPathValidatorException {
|
|
76 |
if (!forward) {
|
|
77 |
i = 0;
|
|
78 |
maxPathLength = certPathLength;
|
|
79 |
prevNC = null;
|
|
80 |
} else {
|
|
81 |
throw new CertPathValidatorException
|
|
82 |
("forward checking not supported");
|
|
83 |
}
|
|
84 |
}
|
|
85 |
|
|
86 |
public boolean isForwardCheckingSupported() {
|
|
87 |
return false;
|
|
88 |
}
|
|
89 |
|
|
90 |
public Set<String> getSupportedExtensions() {
|
|
91 |
if (supportedExts == null) {
|
|
92 |
supportedExts = new HashSet<String>();
|
|
93 |
supportedExts.add(PKIXExtensions.BasicConstraints_Id.toString());
|
|
94 |
supportedExts.add(PKIXExtensions.NameConstraints_Id.toString());
|
|
95 |
supportedExts = Collections.unmodifiableSet(supportedExts);
|
|
96 |
}
|
|
97 |
return supportedExts;
|
|
98 |
}
|
|
99 |
|
|
100 |
/**
|
|
101 |
* Performs the basic constraints and name constraints
|
|
102 |
* checks on the certificate using its internal state.
|
|
103 |
*
|
|
104 |
* @param cert the <code>Certificate</code> to be checked
|
|
105 |
* @param unresCritExts a <code>Collection</code> of OID strings
|
|
106 |
* representing the current set of unresolved critical extensions
|
|
107 |
* @throws CertPathValidatorException if the specified certificate
|
|
108 |
* does not pass the check
|
|
109 |
*/
|
|
110 |
public void check(Certificate cert, Collection<String> unresCritExts)
|
|
111 |
throws CertPathValidatorException
|
|
112 |
{
|
|
113 |
X509Certificate currCert = (X509Certificate) cert;
|
|
114 |
|
|
115 |
i++;
|
|
116 |
// MUST run NC check second, since it depends on BC check to
|
|
117 |
// update remainingCerts
|
|
118 |
checkBasicConstraints(currCert);
|
|
119 |
verifyNameConstraints(currCert);
|
|
120 |
|
|
121 |
if (unresCritExts != null && !unresCritExts.isEmpty()) {
|
|
122 |
unresCritExts.remove(PKIXExtensions.BasicConstraints_Id.toString());
|
|
123 |
unresCritExts.remove(PKIXExtensions.NameConstraints_Id.toString());
|
|
124 |
}
|
|
125 |
}
|
|
126 |
|
|
127 |
/**
|
|
128 |
* Internal method to check the name constraints against a cert
|
|
129 |
*/
|
|
130 |
private void verifyNameConstraints(X509Certificate currCert)
|
|
131 |
throws CertPathValidatorException
|
|
132 |
{
|
|
133 |
String msg = "name constraints";
|
|
134 |
if (debug != null) {
|
|
135 |
debug.println("---checking " + msg + "...");
|
|
136 |
}
|
|
137 |
|
|
138 |
// check name constraints only if there is a previous name constraint
|
|
139 |
// and either the currCert is the final cert or the currCert is not
|
|
140 |
// self-issued
|
|
141 |
if (prevNC != null && ((i == certPathLength) ||
|
|
142 |
!X509CertImpl.isSelfIssued(currCert))) {
|
|
143 |
if (debug != null) {
|
|
144 |
debug.println("prevNC = " + prevNC);
|
|
145 |
debug.println("currDN = " + currCert.getSubjectX500Principal());
|
|
146 |
}
|
|
147 |
|
|
148 |
try {
|
|
149 |
if (!prevNC.verify(currCert)) {
|
|
150 |
throw new CertPathValidatorException(msg + " check failed");
|
|
151 |
}
|
|
152 |
} catch (IOException ioe) {
|
|
153 |
throw new CertPathValidatorException(ioe);
|
|
154 |
}
|
|
155 |
}
|
|
156 |
|
|
157 |
// merge name constraints regardless of whether cert is self-issued
|
|
158 |
prevNC = mergeNameConstraints(currCert, prevNC);
|
|
159 |
|
|
160 |
if (debug != null)
|
|
161 |
debug.println(msg + " verified.");
|
|
162 |
}
|
|
163 |
|
|
164 |
/**
|
|
165 |
* Helper to fold sets of name constraints together
|
|
166 |
*/
|
|
167 |
static NameConstraintsExtension
|
|
168 |
mergeNameConstraints(X509Certificate currCert,
|
|
169 |
NameConstraintsExtension prevNC) throws CertPathValidatorException
|
|
170 |
{
|
|
171 |
X509CertImpl currCertImpl;
|
|
172 |
try {
|
|
173 |
currCertImpl = X509CertImpl.toImpl(currCert);
|
|
174 |
} catch (CertificateException ce) {
|
|
175 |
throw new CertPathValidatorException(ce);
|
|
176 |
}
|
|
177 |
|
|
178 |
NameConstraintsExtension newConstraints =
|
|
179 |
currCertImpl.getNameConstraintsExtension();
|
|
180 |
|
|
181 |
if (debug != null) {
|
|
182 |
debug.println("prevNC = " + prevNC);
|
|
183 |
debug.println("newNC = " + String.valueOf(newConstraints));
|
|
184 |
}
|
|
185 |
|
|
186 |
// if there are no previous name constraints, we just return the
|
|
187 |
// new name constraints.
|
|
188 |
if (prevNC == null) {
|
|
189 |
if (debug != null) {
|
|
190 |
debug.println("mergedNC = " + String.valueOf(newConstraints));
|
|
191 |
}
|
|
192 |
if (newConstraints == null) {
|
|
193 |
return newConstraints;
|
|
194 |
} else {
|
|
195 |
// Make sure we do a clone here, because we're probably
|
|
196 |
// going to modify this object later and we don't want to
|
|
197 |
// be sharing it with a Certificate object!
|
|
198 |
return (NameConstraintsExtension) newConstraints.clone();
|
|
199 |
}
|
|
200 |
} else {
|
|
201 |
try {
|
|
202 |
// after merge, prevNC should contain the merged constraints
|
|
203 |
prevNC.merge(newConstraints);
|
|
204 |
} catch (IOException ioe) {
|
|
205 |
throw new CertPathValidatorException(ioe);
|
|
206 |
}
|
|
207 |
if (debug != null) {
|
|
208 |
debug.println("mergedNC = " + prevNC);
|
|
209 |
}
|
|
210 |
return prevNC;
|
|
211 |
}
|
|
212 |
}
|
|
213 |
|
|
214 |
/**
|
|
215 |
* Internal method to check that a given cert meets basic constraints.
|
|
216 |
*/
|
|
217 |
private void checkBasicConstraints(X509Certificate currCert)
|
|
218 |
throws CertPathValidatorException
|
|
219 |
{
|
|
220 |
String msg = "basic constraints";
|
|
221 |
if (debug != null) {
|
|
222 |
debug.println("---checking " + msg + "...");
|
|
223 |
debug.println("i = " + i);
|
|
224 |
debug.println("maxPathLength = " + maxPathLength);
|
|
225 |
}
|
|
226 |
|
|
227 |
/* check if intermediate cert */
|
|
228 |
if (i < certPathLength) {
|
|
229 |
int pathLenConstraint = currCert.getBasicConstraints();
|
|
230 |
if (pathLenConstraint == -1) {
|
|
231 |
throw new CertPathValidatorException(msg + " check failed: "
|
|
232 |
+ "this is not a CA certificate");
|
|
233 |
}
|
|
234 |
|
|
235 |
if (!X509CertImpl.isSelfIssued(currCert)) {
|
|
236 |
if (maxPathLength <= 0) {
|
|
237 |
throw new CertPathValidatorException
|
|
238 |
(msg + " check failed: pathLenConstraint violated - "
|
|
239 |
+ "this cert must be the last cert in the "
|
|
240 |
+ "certification path");
|
|
241 |
}
|
|
242 |
maxPathLength--;
|
|
243 |
}
|
|
244 |
if (pathLenConstraint < maxPathLength)
|
|
245 |
maxPathLength = pathLenConstraint;
|
|
246 |
}
|
|
247 |
|
|
248 |
if (debug != null) {
|
|
249 |
debug.println("after processing, maxPathLength = " + maxPathLength);
|
|
250 |
debug.println(msg + " verified.");
|
|
251 |
}
|
|
252 |
}
|
|
253 |
|
|
254 |
/**
|
|
255 |
* Merges the specified maxPathLength with the pathLenConstraint
|
|
256 |
* obtained from the certificate.
|
|
257 |
*
|
|
258 |
* @param cert the <code>X509Certificate</code>
|
|
259 |
* @param maxPathLength the previous maximum path length
|
|
260 |
* @return the new maximum path length constraint (-1 means no more
|
|
261 |
* certificates can follow, Integer.MAX_VALUE means path length is
|
|
262 |
* unconstrained)
|
|
263 |
*/
|
|
264 |
static int mergeBasicConstraints(X509Certificate cert, int maxPathLength) {
|
|
265 |
|
|
266 |
int pathLenConstraint = cert.getBasicConstraints();
|
|
267 |
|
|
268 |
if (!X509CertImpl.isSelfIssued(cert)) {
|
|
269 |
maxPathLength--;
|
|
270 |
}
|
|
271 |
|
|
272 |
if (pathLenConstraint < maxPathLength) {
|
|
273 |
maxPathLength = pathLenConstraint;
|
|
274 |
}
|
|
275 |
|
|
276 |
return maxPathLength;
|
|
277 |
}
|
|
278 |
}
|