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569 lines
21 KiB
Java
569 lines
21 KiB
Java
/*
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* Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.security.x509;
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import java.io.IOException;
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import java.security.cert.CertificateException;
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import java.security.cert.X509Certificate;
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import javax.security.auth.x500.X500Principal;
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import sun.net.util.IPAddressUtil;
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import sun.security.util.*;
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import sun.security.pkcs.PKCS9Attribute;
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/**
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* This class defines the Name Constraints Extension.
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* <p>
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* The name constraints extension provides permitted and excluded
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* subtrees that place restrictions on names that may be included within
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* a certificate issued by a given CA. Restrictions may apply to the
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* subject distinguished name or subject alternative names. Any name
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* matching a restriction in the excluded subtrees field is invalid
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* regardless of information appearing in the permitted subtrees.
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* <p>
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* The ASN.1 syntax for this is:
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* <pre>
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* NameConstraints ::= SEQUENCE {
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* permittedSubtrees [0] GeneralSubtrees OPTIONAL,
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* excludedSubtrees [1] GeneralSubtrees OPTIONAL
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* }
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* GeneralSubtrees ::= SEQUENCE SIZE (1..MAX) OF GeneralSubtree
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* </pre>
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*
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* @author Amit Kapoor
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* @author Hemma Prafullchandra
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* @see Extension
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* @see CertAttrSet
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*/
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public class NameConstraintsExtension extends Extension
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implements CertAttrSet, Cloneable {
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public static final String NAME = "NameConstraints";
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// Private data members
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private static final byte TAG_PERMITTED = 0;
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private static final byte TAG_EXCLUDED = 1;
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private GeneralSubtrees permitted = null;
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private GeneralSubtrees excluded = null;
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private boolean hasMin;
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private boolean hasMax;
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private boolean minMaxValid = false;
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// Recalculate hasMin and hasMax flags.
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private void calcMinMax() {
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hasMin = false;
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hasMax = false;
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if (excluded != null) {
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for (int i = 0; i < excluded.size(); i++) {
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GeneralSubtree subtree = excluded.get(i);
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if (subtree.getMinimum() != 0)
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hasMin = true;
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if (subtree.getMaximum() != -1)
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hasMax = true;
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}
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}
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if (permitted != null) {
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for (int i = 0; i < permitted.size(); i++) {
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GeneralSubtree subtree = permitted.get(i);
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if (subtree.getMinimum() != 0)
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hasMin = true;
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if (subtree.getMaximum() != -1)
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hasMax = true;
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}
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}
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minMaxValid = true;
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}
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// Encode this extension value.
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private void encodeThis() throws IOException {
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minMaxValid = false;
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if (permitted == null && excluded == null) {
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this.extensionValue = null;
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return;
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}
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DerOutputStream seq = new DerOutputStream();
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DerOutputStream tagged = new DerOutputStream();
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if (permitted != null) {
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DerOutputStream tmp = new DerOutputStream();
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permitted.encode(tmp);
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tagged.writeImplicit(DerValue.createTag(DerValue.TAG_CONTEXT,
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true, TAG_PERMITTED), tmp);
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}
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if (excluded != null) {
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DerOutputStream tmp = new DerOutputStream();
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excluded.encode(tmp);
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tagged.writeImplicit(DerValue.createTag(DerValue.TAG_CONTEXT,
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true, TAG_EXCLUDED), tmp);
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}
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seq.write(DerValue.tag_Sequence, tagged);
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this.extensionValue = seq.toByteArray();
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}
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/**
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* The default constructor for this class. Both parameters
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* are optional and can be set to null. The extension criticality
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* is set to true.
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*
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* @param permitted the permitted GeneralSubtrees (null for optional).
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* @param excluded the excluded GeneralSubtrees (null for optional).
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*/
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public NameConstraintsExtension(GeneralSubtrees permitted,
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GeneralSubtrees excluded)
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throws IOException {
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this.permitted = permitted;
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this.excluded = excluded;
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this.extensionId = PKIXExtensions.NameConstraints_Id;
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this.critical = true;
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encodeThis();
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}
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/**
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* Create the extension from the passed DER encoded value.
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*
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* @param critical true if the extension is to be treated as critical.
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* @param value an array of DER encoded bytes of the actual value.
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* @exception ClassCastException if value is not an array of bytes
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* @exception IOException on error.
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*/
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public NameConstraintsExtension(Boolean critical, Object value)
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throws IOException {
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this.extensionId = PKIXExtensions.NameConstraints_Id;
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this.critical = critical.booleanValue();
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this.extensionValue = (byte[]) value;
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DerValue val = new DerValue(this.extensionValue);
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if (val.tag != DerValue.tag_Sequence) {
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throw new IOException("Invalid encoding for" +
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" NameConstraintsExtension.");
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}
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// NB. this is always encoded with the IMPLICIT tag
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// The checks only make sense if we assume implicit tagging,
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// with explicit tagging the form is always constructed.
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// Note that all the fields in NameConstraints are defined as
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// being OPTIONAL, i.e., there could be an empty SEQUENCE, resulting
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// in val.data being null.
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if (val.data == null)
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return;
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while (val.data.available() != 0) {
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DerValue opt = val.data.getDerValue();
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if (opt.isContextSpecific(TAG_PERMITTED) && opt.isConstructed()) {
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if (permitted != null) {
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throw new IOException("Duplicate permitted " +
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"GeneralSubtrees in NameConstraintsExtension.");
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}
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opt.resetTag(DerValue.tag_Sequence);
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permitted = new GeneralSubtrees(opt);
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} else if (opt.isContextSpecific(TAG_EXCLUDED) &&
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opt.isConstructed()) {
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if (excluded != null) {
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throw new IOException("Duplicate excluded " +
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"GeneralSubtrees in NameConstraintsExtension.");
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}
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opt.resetTag(DerValue.tag_Sequence);
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excluded = new GeneralSubtrees(opt);
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} else
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throw new IOException("Invalid encoding of " +
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"NameConstraintsExtension.");
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}
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minMaxValid = false;
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}
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/**
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* Return the printable string.
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*/
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public String toString() {
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StringBuilder sb = new StringBuilder();
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sb.append(super.toString())
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.append("NameConstraints: [");
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if (permitted != null) {
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sb.append("\n Permitted:")
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.append(permitted);
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}
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if (excluded != null) {
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sb.append("\n Excluded:")
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.append(excluded);
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}
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sb.append(" ]\n");
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return sb.toString();
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}
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/**
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* Write the extension to the OutputStream.
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*
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* @param out the DerOutputStream to write the extension to.
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* @exception IOException on encoding errors.
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*/
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@Override
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public void encode(DerOutputStream out) throws IOException {
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if (this.extensionValue == null) {
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this.extensionId = PKIXExtensions.NameConstraints_Id;
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this.critical = true;
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encodeThis();
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}
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super.encode(out);
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}
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public GeneralSubtrees getPermittedSubtrees() {
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return permitted;
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}
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public GeneralSubtrees getExcludedSubtrees() {
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return excluded;
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}
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/**
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* Return the name of this extension.
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*/
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@Override
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public String getName() {
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return NAME;
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}
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/**
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* Merge additional name constraints with existing ones.
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* This function is used in certification path processing
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* to accumulate name constraints from successive certificates
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* in the path. Note that NameConstraints can never be
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* expanded by a merge, just remain constant or become more
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* limiting.
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* <p>
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* IETF RFC 5280 specifies the processing of Name Constraints as
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* follows:
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* <p>
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* (j) If permittedSubtrees is present in the certificate, set the
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* constrained subtrees state variable to the intersection of its
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* previous value and the value indicated in the extension field.
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* <p>
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* (k) If excludedSubtrees is present in the certificate, set the
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* excluded subtrees state variable to the union of its previous
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* value and the value indicated in the extension field.
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*
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* @param newConstraints additional NameConstraints to be applied
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* @throws IOException on error
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*/
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public void merge(NameConstraintsExtension newConstraints)
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throws IOException {
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if (newConstraints == null) {
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// absence of any explicit constraints implies unconstrained
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return;
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}
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/*
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* If excludedSubtrees is present in the certificate, set the
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* excluded subtrees state variable to the union of its previous
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* value and the value indicated in the extension field.
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*/
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GeneralSubtrees newExcluded = newConstraints.getExcludedSubtrees();
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if (excluded == null) {
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excluded = (newExcluded != null) ?
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(GeneralSubtrees)newExcluded.clone() : null;
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} else {
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if (newExcluded != null) {
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// Merge new excluded with current excluded (union)
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excluded.union(newExcluded);
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}
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}
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/*
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* If permittedSubtrees is present in the certificate, set the
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* constrained subtrees state variable to the intersection of its
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* previous value and the value indicated in the extension field.
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*/
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GeneralSubtrees newPermitted = newConstraints.getPermittedSubtrees();
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if (permitted == null) {
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permitted = (newPermitted != null) ?
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(GeneralSubtrees)newPermitted.clone() : null;
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} else {
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if (newPermitted != null) {
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// Merge new permitted with current permitted (intersection)
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newExcluded = permitted.intersect(newPermitted);
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// Merge new excluded subtrees to current excluded (union)
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if (newExcluded != null) {
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if (excluded != null) {
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excluded.union(newExcluded);
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} else {
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excluded = (GeneralSubtrees)newExcluded.clone();
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}
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}
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}
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}
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// Optional optimization: remove permitted subtrees that are excluded.
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// This is not necessary for algorithm correctness, but it makes
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// subsequent operations on the NameConstraints faster and require
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// less space.
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if (permitted != null) {
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permitted.reduce(excluded);
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}
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// The NameConstraints have been changed, so re-encode them. Methods in
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// this class assume that the encodings have already been done.
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encodeThis();
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}
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/**
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* check whether a certificate conforms to these NameConstraints.
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* This involves verifying that the subject name and subjectAltName
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* extension (critical or noncritical) is consistent with the permitted
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* subtrees state variables. Also verify that the subject name and
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* subjectAltName extension (critical or noncritical) is consistent with
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* the excluded subtrees state variables.
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*
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* @param cert X509Certificate to be verified
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* @return true if certificate verifies successfully
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* @throws IOException on error
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*/
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public boolean verify(X509Certificate cert) throws IOException {
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if (cert == null) {
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throw new IOException("Certificate is null");
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}
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// Calculate hasMin and hasMax booleans (if necessary)
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if (!minMaxValid) {
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calcMinMax();
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}
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if (hasMin) {
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throw new IOException("Non-zero minimum BaseDistance in"
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+ " name constraints not supported");
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}
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if (hasMax) {
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throw new IOException("Maximum BaseDistance in"
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+ " name constraints not supported");
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}
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X500Principal subjectPrincipal = cert.getSubjectX500Principal();
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X500Name subject = X500Name.asX500Name(subjectPrincipal);
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// Check subject as an X500Name
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if (!subject.isEmpty()) {
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if (!verify(subject)) {
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return false;
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}
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}
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GeneralNames altNames = null;
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// extract altNames
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try {
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// extract extensions, if any, from certInfo
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// following returns null if certificate contains no extensions
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X509CertImpl certImpl = X509CertImpl.toImpl(cert);
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SubjectAlternativeNameExtension altNameExt =
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certImpl.getSubjectAlternativeNameExtension();
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if (altNameExt != null) {
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// extract altNames from extension; this call does not
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// return an IOException on null altnames
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altNames = altNameExt.getNames();
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}
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} catch (CertificateException ce) {
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throw new IOException("Unable to extract extensions from " +
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"certificate: " + ce.getMessage());
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}
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if (altNames == null) {
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altNames = new GeneralNames();
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// RFC 5280 4.2.1.10:
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// When constraints are imposed on the rfc822Name name form,
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// but the certificate does not include a subject alternative name,
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// the rfc822Name constraint MUST be applied to the attribute of
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// type emailAddress in the subject distinguished name.
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for (AVA ava : subject.allAvas()) {
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ObjectIdentifier attrOID = ava.getObjectIdentifier();
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if (attrOID.equals(PKCS9Attribute.EMAIL_ADDRESS_OID)) {
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String attrValue = ava.getValueString();
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if (attrValue != null) {
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try {
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altNames.add(new GeneralName(
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new RFC822Name(attrValue)));
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} catch (IOException ioe) {
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continue;
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}
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}
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}
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}
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}
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// If there is no IPAddressName or DNSName in subjectAlternativeNames,
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// see if the last CN inside subjectName can be used instead.
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DerValue derValue = subject.findMostSpecificAttribute
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(X500Name.commonName_oid);
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String cn = derValue == null ? null : derValue.getAsString();
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if (cn != null) {
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try {
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if (IPAddressUtil.isIPv4LiteralAddress(cn) ||
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IPAddressUtil.isIPv6LiteralAddress(cn)) {
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if (!hasNameType(altNames, GeneralNameInterface.NAME_IP)) {
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altNames.add(new GeneralName(new IPAddressName(cn)));
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}
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} else {
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if (!hasNameType(altNames, GeneralNameInterface.NAME_DNS)) {
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altNames.add(new GeneralName(new DNSName(cn)));
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}
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}
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} catch (IOException ioe) {
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// OK, cn is neither IP nor DNS
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}
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}
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// verify each subjectAltName
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for (int i = 0; i < altNames.size(); i++) {
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GeneralNameInterface altGNI = altNames.get(i).getName();
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if (!verify(altGNI)) {
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return false;
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}
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}
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// All tests passed.
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return true;
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}
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private static boolean hasNameType(GeneralNames names, int type) {
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for (GeneralName name : names.names()) {
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if (name.getType() == type) {
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return true;
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}
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}
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return false;
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}
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/**
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* check whether a name conforms to these NameConstraints.
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* This involves verifying that the name is consistent with the
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* permitted and excluded subtrees variables.
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*
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* @param name GeneralNameInterface name to be verified
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* @return true if certificate verifies successfully
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* @throws IOException on error
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*/
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public boolean verify(GeneralNameInterface name) throws IOException {
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if (name == null) {
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throw new IOException("name is null");
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}
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// Verify that the name is consistent with the excluded subtrees
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if (excluded != null && excluded.size() > 0) {
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for (int i = 0; i < excluded.size(); i++) {
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GeneralSubtree gs = excluded.get(i);
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if (gs == null)
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continue;
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GeneralName gn = gs.getName();
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if (gn == null)
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continue;
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GeneralNameInterface exName = gn.getName();
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if (exName == null)
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continue;
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// if name matches or narrows any excluded subtree,
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// return false
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switch (exName.constrains(name)) {
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case GeneralNameInterface.NAME_DIFF_TYPE:
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case GeneralNameInterface.NAME_WIDENS: // name widens excluded
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case GeneralNameInterface.NAME_SAME_TYPE:
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break;
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case GeneralNameInterface.NAME_MATCH:
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case GeneralNameInterface.NAME_NARROWS: // subject name excluded
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return false;
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}
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}
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}
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// Verify that the name is consistent with the permitted subtrees
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if (permitted != null && permitted.size() > 0) {
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boolean sameType = false;
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for (int i = 0; i < permitted.size(); i++) {
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GeneralSubtree gs = permitted.get(i);
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if (gs == null)
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continue;
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GeneralName gn = gs.getName();
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if (gn == null)
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continue;
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GeneralNameInterface perName = gn.getName();
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if (perName == null)
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continue;
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// if Name matches any type in permitted,
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// and Name does not match or narrow some permitted subtree,
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// return false
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switch (perName.constrains(name)) {
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case GeneralNameInterface.NAME_DIFF_TYPE:
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continue; // continue checking other permitted names
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case GeneralNameInterface.NAME_WIDENS: // name widens permitted
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case GeneralNameInterface.NAME_SAME_TYPE:
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sameType = true;
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continue; // continue to look for a match or narrow
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case GeneralNameInterface.NAME_MATCH:
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case GeneralNameInterface.NAME_NARROWS:
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// name narrows permitted
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return true; // name is definitely OK, so break out of loop
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}
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}
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return !sameType;
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}
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return true;
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}
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|
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/**
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* Clone all objects that may be modified during certificate validation.
|
|
*/
|
|
public Object clone() {
|
|
try {
|
|
NameConstraintsExtension newNCE =
|
|
(NameConstraintsExtension) super.clone();
|
|
|
|
if (permitted != null) {
|
|
newNCE.permitted = (GeneralSubtrees) permitted.clone();
|
|
}
|
|
if (excluded != null) {
|
|
newNCE.excluded = (GeneralSubtrees) excluded.clone();
|
|
}
|
|
return newNCE;
|
|
} catch (CloneNotSupportedException cnsee) {
|
|
throw new RuntimeException("CloneNotSupportedException while " +
|
|
"cloning NameConstraintsException. This should never happen.");
|
|
}
|
|
}
|
|
}
|