1 /*
2 * Copyright (c) 2000, 2015, 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 java.security.cert;
27
28 import java.security.AccessController;
29 import java.security.InvalidAlgorithmParameterException;
30 import java.security.NoSuchAlgorithmException;
31 import java.security.NoSuchProviderException;
32 import java.security.PrivilegedAction;
33 import java.security.Provider;
34 import java.security.Security;
35 import sun.security.util.Debug;
36
37 import sun.security.jca.*;
38 import sun.security.jca.GetInstance.Instance;
39
40 /**
41 * A class for validating certification paths (also known as certificate
42 * chains).
43 * <p>
44 * This class uses a provider-based architecture.
45 * To create a {@code CertPathValidator},
46 * call one of the static {@code getInstance} methods, passing in the
47 * algorithm name of the {@code CertPathValidator} desired and
48 * optionally the name of the provider desired.
49 *
50 * <p>Once a {@code CertPathValidator} object has been created, it can
51 * be used to validate certification paths by calling the {@link #validate
52 * validate} method and passing it the {@code CertPath} to be validated
53 * and an algorithm-specific set of parameters. If successful, the result is
54 * returned in an object that implements the
55 * {@code CertPathValidatorResult} interface.
56 *
57 * <p>The {@link #getRevocationChecker} method allows an application to specify
58 * additional algorithm-specific parameters and options used by the
59 * {@code CertPathValidator} when checking the revocation status of
60 * certificates. Here is an example demonstrating how it is used with the PKIX
61 * algorithm:
62 *
63 * <pre>
64 * CertPathValidator cpv = CertPathValidator.getInstance("PKIX");
65 * PKIXRevocationChecker rc = (PKIXRevocationChecker)cpv.getRevocationChecker();
66 * rc.setOptions(EnumSet.of(Option.SOFT_FAIL));
67 * params.addCertPathChecker(rc);
68 * CertPathValidatorResult cpvr = cpv.validate(path, params);
69 * </pre>
70 *
71 * <p>Every implementation of the Java platform is required to support the
72 * following standard {@code CertPathValidator} algorithm:
73 * <ul>
74 * <li>{@code PKIX}</li>
75 * </ul>
76 * This algorithm is described in the <a href=
77 * "{@docRoot}/../technotes/guides/security/StandardNames.html#CertPathValidator">
78 * CertPathValidator section</a> of the
79 * Java Cryptography Architecture Standard Algorithm Name Documentation.
80 * Consult the release documentation for your implementation to see if any
81 * other algorithms are supported.
82 *
83 * <p>
84 * <b>Concurrent Access</b>
85 * <p>
86 * The static methods of this class are guaranteed to be thread-safe.
87 * Multiple threads may concurrently invoke the static methods defined in
88 * this class with no ill effects.
89 * <p>
90 * However, this is not true for the non-static methods defined by this class.
91 * Unless otherwise documented by a specific provider, threads that need to
92 * access a single {@code CertPathValidator} instance concurrently should
93 * synchronize amongst themselves and provide the necessary locking. Multiple
94 * threads each manipulating a different {@code CertPathValidator}
95 * instance need not synchronize.
96 *
97 * @see CertPath
98 *
99 * @since 1.4
100 * @author Yassir Elley
101 */
102 public class CertPathValidator {
103
104 /*
105 * Constant to lookup in the Security properties file to determine
106 * the default certpathvalidator type. In the Security properties file,
107 * the default certpathvalidator type is given as:
108 * <pre>
109 * certpathvalidator.type=PKIX
110 * </pre>
111 */
112 private static final String CPV_TYPE = "certpathvalidator.type";
113 private final CertPathValidatorSpi validatorSpi;
114 private final Provider provider;
115 private final String algorithm;
116
117 /**
118 * Creates a {@code CertPathValidator} object of the given algorithm,
119 * and encapsulates the given provider implementation (SPI object) in it.
120 *
121 * @param validatorSpi the provider implementation
122 * @param provider the provider
123 * @param algorithm the algorithm name
124 */
125 protected CertPathValidator(CertPathValidatorSpi validatorSpi,
126 Provider provider, String algorithm)
127 {
128 this.validatorSpi = validatorSpi;
129 this.provider = provider;
130 this.algorithm = algorithm;
131 }
132
133 /**
134 * Returns a {@code CertPathValidator} object that implements the
135 * specified algorithm.
136 *
137 * <p> This method traverses the list of registered security Providers,
138 * starting with the most preferred Provider.
139 * A new CertPathValidator object encapsulating the
140 * CertPathValidatorSpi implementation from the first
141 * Provider that supports the specified algorithm is returned.
142 *
143 * <p> Note that the list of registered providers may be retrieved via
144 * the {@link Security#getProviders() Security.getProviders()} method.
145 *
146 * @implNote
147 * The JDK Reference Implementation additionally uses the
148 * {@code jdk.security.provider.preferred} property to determine
149 * the preferred provider order for the specified algorithm. This
150 * may be different than the order of providers returned by
151 * {@link Security#getProviders() Security.getProviders()}.
152 *
153 * @param algorithm the name of the requested {@code CertPathValidator}
154 * algorithm. See the CertPathValidator section in the <a href=
155 * "{@docRoot}/../technotes/guides/security/StandardNames.html#CertPathValidator">
156 * Java Cryptography Architecture Standard Algorithm Name Documentation</a>
157 * for information about standard algorithm names.
158 *
159 * @return a {@code CertPathValidator} object that implements the
160 * specified algorithm.
161 *
162 * @exception NoSuchAlgorithmException if no Provider supports a
163 * CertPathValidatorSpi implementation for the
164 * specified algorithm.
165 *
166 * @see java.security.Provider
167 */
168 public static CertPathValidator getInstance(String algorithm)
169 throws NoSuchAlgorithmException {
170 Instance instance = GetInstance.getInstance("CertPathValidator",
171 CertPathValidatorSpi.class, algorithm);
172 return new CertPathValidator((CertPathValidatorSpi)instance.impl,
173 instance.provider, algorithm);
174 }
175
176 /**
177 * Returns a {@code CertPathValidator} object that implements the
178 * specified algorithm.
179 *
180 * <p> A new CertPathValidator object encapsulating the
181 * CertPathValidatorSpi implementation from the specified provider
182 * is returned. The specified provider must be registered
183 * in the security provider list.
184 *
185 * <p> Note that the list of registered providers may be retrieved via
186 * the {@link Security#getProviders() Security.getProviders()} method.
187 *
188 * @param algorithm the name of the requested {@code CertPathValidator}
189 * algorithm. See the CertPathValidator section in the <a href=
190 * "{@docRoot}/../technotes/guides/security/StandardNames.html#CertPathValidator">
191 * Java Cryptography Architecture Standard Algorithm Name Documentation</a>
192 * for information about standard algorithm names.
193 *
194 * @param provider the name of the provider.
195 *
196 * @return a {@code CertPathValidator} object that implements the
197 * specified algorithm.
198 *
199 * @exception NoSuchAlgorithmException if a CertPathValidatorSpi
200 * implementation for the specified algorithm is not
201 * available from the specified provider.
202 *
203 * @exception NoSuchProviderException if the specified provider is not
204 * registered in the security provider list.
205 *
206 * @exception IllegalArgumentException if the {@code provider} is
207 * null or empty.
208 *
209 * @see java.security.Provider
210 */
211 public static CertPathValidator getInstance(String algorithm,
212 String provider) throws NoSuchAlgorithmException,
213 NoSuchProviderException {
214 Instance instance = GetInstance.getInstance("CertPathValidator",
215 CertPathValidatorSpi.class, algorithm, provider);
216 return new CertPathValidator((CertPathValidatorSpi)instance.impl,
217 instance.provider, algorithm);
218 }
219
220 /**
221 * Returns a {@code CertPathValidator} object that implements the
222 * specified algorithm.
223 *
224 * <p> A new CertPathValidator object encapsulating the
225 * CertPathValidatorSpi implementation from the specified Provider
226 * object is returned. Note that the specified Provider object
227 * does not have to be registered in the provider list.
228 *
229 * @param algorithm the name of the requested {@code CertPathValidator}
230 * algorithm. See the CertPathValidator section in the <a href=
231 * "{@docRoot}/../technotes/guides/security/StandardNames.html#CertPathValidator">
232 * Java Cryptography Architecture Standard Algorithm Name Documentation</a>
233 * for information about standard algorithm names.
234 *
235 * @param provider the provider.
236 *
237 * @return a {@code CertPathValidator} object that implements the
238 * specified algorithm.
239 *
240 * @exception NoSuchAlgorithmException if a CertPathValidatorSpi
241 * implementation for the specified algorithm is not available
242 * from the specified Provider object.
243 *
244 * @exception IllegalArgumentException if the {@code provider} is
245 * null.
246 *
247 * @see java.security.Provider
248 */
249 public static CertPathValidator getInstance(String algorithm,
250 Provider provider) throws NoSuchAlgorithmException {
251 Instance instance = GetInstance.getInstance("CertPathValidator",
252 CertPathValidatorSpi.class, algorithm, provider);
253 return new CertPathValidator((CertPathValidatorSpi)instance.impl,
254 instance.provider, algorithm);
255 }
256
257 /**
258 * Returns the {@code Provider} of this
259 * {@code CertPathValidator}.
260 *
261 * @return the {@code Provider} of this {@code CertPathValidator}
262 */
263 public final Provider getProvider() {
264 return this.provider;
265 }
266
267 /**
268 * Returns the algorithm name of this {@code CertPathValidator}.
269 *
270 * @return the algorithm name of this {@code CertPathValidator}
271 */
272 public final String getAlgorithm() {
273 return this.algorithm;
274 }
275
276 /**
277 * Validates the specified certification path using the specified
278 * algorithm parameter set.
279 * <p>
280 * The {@code CertPath} specified must be of a type that is
281 * supported by the validation algorithm, otherwise an
282 * {@code InvalidAlgorithmParameterException} will be thrown. For
283 * example, a {@code CertPathValidator} that implements the PKIX
284 * algorithm validates {@code CertPath} objects of type X.509.
285 *
286 * @param certPath the {@code CertPath} to be validated
287 * @param params the algorithm parameters
288 * @return the result of the validation algorithm
289 * @exception CertPathValidatorException if the {@code CertPath}
290 * does not validate
291 * @exception InvalidAlgorithmParameterException if the specified
292 * parameters or the type of the specified {@code CertPath} are
293 * inappropriate for this {@code CertPathValidator}
294 */
295 public final CertPathValidatorResult validate(CertPath certPath,
296 CertPathParameters params)
297 throws CertPathValidatorException, InvalidAlgorithmParameterException
298 {
299 return validatorSpi.engineValidate(certPath, params);
300 }
301
302 /**
303 * Returns the default {@code CertPathValidator} type as specified by
304 * the {@code certpathvalidator.type} security property, or the string
305 * {@literal "PKIX"} if no such property exists.
306 *
307 * <p>The default {@code CertPathValidator} type can be used by
308 * applications that do not want to use a hard-coded type when calling one
309 * of the {@code getInstance} methods, and want to provide a default
310 * type in case a user does not specify its own.
311 *
312 * <p>The default {@code CertPathValidator} type can be changed by
313 * setting the value of the {@code certpathvalidator.type} security
314 * property to the desired type.
315 *
316 * @see java.security.Security security properties
317 * @return the default {@code CertPathValidator} type as specified
318 * by the {@code certpathvalidator.type} security property, or the string
319 * {@literal "PKIX"} if no such property exists.
320 */
321 public static final String getDefaultType() {
322 String cpvtype =
323 AccessController.doPrivileged(new PrivilegedAction<>() {
324 public String run() {
325 return Security.getProperty(CPV_TYPE);
326 }
327 });
328 return (cpvtype == null) ? "PKIX" : cpvtype;
329 }
330
331 /**
332 * Returns a {@code CertPathChecker} that the encapsulated
333 * {@code CertPathValidatorSpi} implementation uses to check the revocation
334 * status of certificates. A PKIX implementation returns objects of
335 * type {@code PKIXRevocationChecker}. Each invocation of this method
336 * returns a new instance of {@code CertPathChecker}.
337 *
338 * <p>The primary purpose of this method is to allow callers to specify
339 * additional input parameters and options specific to revocation checking.
340 * See the class description for an example.
341 *
342 * @return a {@code CertPathChecker}
343 * @throws UnsupportedOperationException if the service provider does not
344 * support this method
345 * @since 1.8
346 */
347 public final CertPathChecker getRevocationChecker() {
348 return validatorSpi.engineGetRevocationChecker();
349 }
350 }