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/*
* Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.security.x509;
import java.io.IOException;
import sun.security.util.*;
/**
* This class defines the certificate extension which specifies the
* Policy constraints.
* <p>
* The policy constraints extension can be used in certificates issued
* to CAs. The policy constraints extension constrains path validation
* in two ways. It can be used to prohibit policy mapping or require
* that each certificate in a path contain an acceptable policy
* identifier.<p>
* The ASN.1 syntax for this is (IMPLICIT tagging is defined in the
* module definition):
* <pre>
* PolicyConstraints ::= SEQUENCE {
* requireExplicitPolicy [0] SkipCerts OPTIONAL,
* inhibitPolicyMapping [1] SkipCerts OPTIONAL
* }
* SkipCerts ::= INTEGER (0..MAX)
* </pre>
* @author Amit Kapoor
* @author Hemma Prafullchandra
* @see Extension
*/
public class PolicyConstraintsExtension extends Extension {
public static final String NAME = "PolicyConstraints";
private static final byte TAG_REQUIRE = 0;
private static final byte TAG_INHIBIT = 1;
private int require = -1;
private int inhibit = -1;
// Encode this extension value.
private void encodeThis() {
if (require == -1 && inhibit == -1) {
this.extensionValue = null;
return;
}
DerOutputStream tagged = new DerOutputStream();
DerOutputStream seq = new DerOutputStream();
if (require != -1) {
DerOutputStream tmp = new DerOutputStream();
tmp.putInteger(require);
tagged.writeImplicit(DerValue.createTag(DerValue.TAG_CONTEXT,
false, TAG_REQUIRE), tmp);
}
if (inhibit != -1) {
DerOutputStream tmp = new DerOutputStream();
tmp.putInteger(inhibit);
tagged.writeImplicit(DerValue.createTag(DerValue.TAG_CONTEXT,
false, TAG_INHIBIT), tmp);
}
seq.write(DerValue.tag_Sequence, tagged);
this.extensionValue = seq.toByteArray();
}
/**
* Create a PolicyConstraintsExtension object with both
* require explicit policy and inhibit policy mapping. The
* extension is marked non-critical.
*
* @param require require explicit policy (-1 for optional).
* @param inhibit inhibit policy mapping (-1 for optional).
*/
public PolicyConstraintsExtension(int require, int inhibit) {
this(Boolean.TRUE, require, inhibit);
}
/**
* Create a PolicyConstraintsExtension object with specified
* criticality and both require explicit policy and inhibit
* policy mapping. At least one should be provided (not -1).
*
* @param critical true if the extension is to be treated as critical.
* @param require require explicit policy (-1 for optional).
* @param inhibit inhibit policy mapping (-1 for optional).
*/
public PolicyConstraintsExtension(Boolean critical, int require, int inhibit) {
if (require == -1 && inhibit == -1) {
throw new IllegalArgumentException(
"require and inhibit cannot both be -1");
}
this.require = require;
this.inhibit = inhibit;
this.extensionId = PKIXExtensions.PolicyConstraints_Id;
this.critical = critical.booleanValue();
encodeThis();
}
/**
* Create the extension from its DER encoded value and criticality.
*
* @param critical true if the extension is to be treated as critical.
* @param value an array of DER encoded bytes of the actual value.
* @exception ClassCastException if value is not an array of bytes
* @exception IOException on error.
*/
public PolicyConstraintsExtension(Boolean critical, Object value)
throws IOException {
this.extensionId = PKIXExtensions.PolicyConstraints_Id;
this.critical = critical.booleanValue();
this.extensionValue = (byte[]) value;
DerValue val = new DerValue(this.extensionValue);
if (val.tag != DerValue.tag_Sequence) {
throw new IOException("Sequence tag missing for PolicyConstraint.");
}
DerInputStream in = val.data;
while (in != null && in.available() != 0) {
DerValue next = in.getDerValue();
if (next.isContextSpecific(TAG_REQUIRE) && !next.isConstructed()) {
if (this.require != -1)
throw new IOException("Duplicate requireExplicitPolicy " +
"found in the PolicyConstraintsExtension");
next.resetTag(DerValue.tag_Integer);
this.require = next.getInteger();
} else if (next.isContextSpecific(TAG_INHIBIT) &&
!next.isConstructed()) {
if (this.inhibit != -1)
throw new IOException("Duplicate inhibitPolicyMapping " +
"found in the PolicyConstraintsExtension");
next.resetTag(DerValue.tag_Integer);
this.inhibit = next.getInteger();
} else
throw new IOException("Invalid encoding of PolicyConstraint");
}
}
/**
* Return the extension as user readable string.
*/
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append(super.toString())
.append("PolicyConstraints: [")
.append(" Require: ");
if (require == -1) {
sb.append("unspecified;");
} else {
sb.append(require)
.append(';');
}
sb.append("\tInhibit: ");
if (inhibit == -1) {
sb.append("unspecified");
} else {
sb.append(inhibit);
}
sb.append(" ]\n");
return sb.toString();
}
/**
* Write the extension to the DerOutputStream.
*
* @param out the DerOutputStream to write the extension to.
*/
@Override
public void encode(DerOutputStream out) {
if (extensionValue == null) {
extensionId = PKIXExtensions.PolicyConstraints_Id;
critical = true;
encodeThis();
}
super.encode(out);
}
public int getRequire() {
return require;
}
public int getInhibit() {
return inhibit;
}
/**
* Return the name of this extension.
*/
@Override
public String getName() {
return NAME;
}
}
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