/* * Copyright (c) 1997, 2006, 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 java.io.OutputStream;import java.security.Principal;import java.security.cert.CertificateEncodingException;import java.security.cert.CertificateException;import java.security.cert.CertificateParsingException;import java.security.cert.X509Certificate;import java.util.*; import javax.security.auth.x500.X500Principal; import sun.security.util.*;import sun.security.pkcs.PKCS9Attribute; /** * This class defines the Name Constraints Extension. * <p> * The name constraints extension provides permitted and excluded * subtrees that place restrictions on names that may be included within * a certificate issued by a given CA.  Restrictions may apply to the * subject distinguished name or subject alternative names.  Any name * matching a restriction in the excluded subtrees field is invalid * regardless of information appearing in the permitted subtrees. * <p> * The ASN.1 syntax for this is: * <pre> * NameConstraints ::= SEQUENCE { *    permittedSubtrees [0]  GeneralSubtrees OPTIONAL, *    excludedSubtrees  [1]  GeneralSubtrees OPTIONAL * } * GeneralSubtrees ::= SEQUENCE SIZE (1..MAX) OF GeneralSubtree * </pre> * * @author Amit Kapoor * @author Hemma Prafullchandra * @see Extension * @see CertAttrSet */public class NameConstraintsExtension extends Extensionimplements CertAttrSet<String>, Cloneable {    /**     * Identifier for this attribute, to be used with the     * get, set, delete methods of Certificate, x509 type.     */    public static final String IDENT = "x509.info.extensions.NameConstraints";    /**     * Attribute names.     */    public static final String NAME = "NameConstraints";    public static final String PERMITTED_SUBTREES = "permitted_subtrees";    public static final String EXCLUDED_SUBTREES = "excluded_subtrees";     // Private data members    private static final byte TAG_PERMITTED = 0;    private static final byte TAG_EXCLUDED = 1;     private GeneralSubtrees     permitted = null;    private GeneralSubtrees     excluded = null;     private boolean hasMin;    private boolean hasMax;    private boolean minMaxValid = false;     // Recalculate hasMin and hasMax flags.    private void calcMinMax() throws IOException {        hasMin = false;        hasMax = false;        if (excluded != null) {            for (int i = 0; i < excluded.size(); i++) {                GeneralSubtree subtree = excluded.get(i);                if (subtree.getMinimum() != 0)                    hasMin = true;                if (subtree.getMaximum() != -1)                    hasMax = true;            }        }         if (permitted != null) {            for (int i = 0; i < permitted.size(); i++) {                GeneralSubtree subtree = permitted.get(i);                if (subtree.getMinimum() != 0)                    hasMin = true;                if (subtree.getMaximum() != -1)                    hasMax = true;            }        }        minMaxValid = true;    }     // Encode this extension value.    private void encodeThis() throws IOException {        minMaxValid = false;        if (permitted == null && excluded == null) {            this.extensionValue = null;            return;        }        DerOutputStream seq = new DerOutputStream();         DerOutputStream tagged = new DerOutputStream();        if (permitted != null) {            DerOutputStream tmp = new DerOutputStream();            permitted.encode(tmp);            tagged.writeImplicit(DerValue.createTag(DerValue.TAG_CONTEXT,                                 true, TAG_PERMITTED), tmp);        }        if (excluded != null) {            DerOutputStream tmp = new DerOutputStream();            excluded.encode(tmp);            tagged.writeImplicit(DerValue.createTag(DerValue.TAG_CONTEXT,                                 true, TAG_EXCLUDED), tmp);        }        seq.write(DerValue.tag_Sequence, tagged);        this.extensionValue = seq.toByteArray();    }     /**     * The default constructor for this class. Both parameters     * are optional and can be set to null.  The extension criticality     * is set to true.     *     * @param permitted the permitted GeneralSubtrees (null for optional).     * @param excluded the excluded GeneralSubtrees (null for optional).     */    public NameConstraintsExtension(GeneralSubtrees permitted,                                    GeneralSubtrees excluded)    throws IOException {        this.permitted = permitted;        this.excluded = excluded;         this.extensionId = PKIXExtensions.NameConstraints_Id;        this.critical = true;        encodeThis();    }     /**     * Create the extension from the passed DER encoded value.     *     * @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 NameConstraintsExtension(Boolean critical, Object value)    throws IOException {        this.extensionId = PKIXExtensions.NameConstraints_Id;        this.critical = critical.booleanValue();         this.extensionValue = (byte[]) value;        DerValue val = new DerValue(this.extensionValue);        if (val.tag != DerValue.tag_Sequence) {            throw new IOException("Invalid encoding for" +                                  " NameConstraintsExtension.");        }         // NB. this is always encoded with the IMPLICIT tag        // The checks only make sense if we assume implicit tagging,        // with explicit tagging the form is always constructed.        // Note that all the fields in NameConstraints are defined as        // being OPTIONAL, i.e., there could be an empty SEQUENCE, resulting        // in val.data being null.        if (val.data == null)            return;        while (val.data.available() != 0) {            DerValue opt = val.data.getDerValue();             if (opt.isContextSpecific(TAG_PERMITTED) && opt.isConstructed()) {                if (permitted != null) {                    throw new IOException("Duplicate permitted " +                         "GeneralSubtrees in NameConstraintsExtension.");                }                opt.resetTag(DerValue.tag_Sequence);                permitted = new GeneralSubtrees(opt);             } else if (opt.isContextSpecific(TAG_EXCLUDED) &&                       opt.isConstructed()) {                if (excluded != null) {                    throw new IOException("Duplicate excluded " +                             "GeneralSubtrees in NameConstraintsExtension.");                }                opt.resetTag(DerValue.tag_Sequence);                excluded = new GeneralSubtrees(opt);            } else                throw new IOException("Invalid encoding of " +                                      "NameConstraintsExtension.");        }        minMaxValid = false;    }     /**     * Return the printable string.     */    public String toString() {        return (super.toString() + "NameConstraints: [" +                ((permitted == null) ? "" :                     ("\n    Permitted:" + permitted.toString())) +                ((excluded == null) ? "" :                     ("\n    Excluded:" + excluded.toString()))                + "   ]\n");    }     /**     * Write the extension to the OutputStream.     *     * @param out the OutputStream to write the extension to.     * @exception IOException on encoding errors.     */    public void encode(OutputStream out) throws IOException {        DerOutputStream tmp = new DerOutputStream();        if (this.extensionValue == null) {            this.extensionId = PKIXExtensions.NameConstraints_Id;            this.critical = true;            encodeThis();        }        super.encode(tmp);        out.write(tmp.toByteArray());    }     /**     * Set the attribute value.     */    public void set(String name, Object obj) throws IOException {        if (name.equalsIgnoreCase(PERMITTED_SUBTREES)) {            if (!(obj instanceof GeneralSubtrees)) {                throw new IOException("Attribute value should be"                                    + " of type GeneralSubtrees.");            }            permitted = (GeneralSubtrees)obj;        } else if (name.equalsIgnoreCase(EXCLUDED_SUBTREES)) {            if (!(obj instanceof GeneralSubtrees)) {                throw new IOException("Attribute value should be "                                    + "of type GeneralSubtrees.");            }            excluded = (GeneralSubtrees)obj;        } else {          throw new IOException("Attribute name not recognized by " +                        "CertAttrSet:NameConstraintsExtension.");        }        encodeThis();    }     /**     * Get the attribute value.     */    public Object get(String name) throws IOException {        if (name.equalsIgnoreCase(PERMITTED_SUBTREES)) {            return (permitted);        } else if (name.equalsIgnoreCase(EXCLUDED_SUBTREES)) {            return (excluded);        } else {          throw new IOException("Attribute name not recognized by " +                        "CertAttrSet:NameConstraintsExtension.");        }    }     /**     * Delete the attribute value.     */    public void delete(String name) throws IOException {        if (name.equalsIgnoreCase(PERMITTED_SUBTREES)) {            permitted = null;        } else if (name.equalsIgnoreCase(EXCLUDED_SUBTREES)) {            excluded = null;        } else {          throw new IOException("Attribute name not recognized by " +                        "CertAttrSet:NameConstraintsExtension.");        }        encodeThis();    }     /**     * Return an enumeration of names of attributes existing within this     * attribute.     */    public Enumeration<String> getElements() {        AttributeNameEnumeration elements = new AttributeNameEnumeration();        elements.addElement(PERMITTED_SUBTREES);        elements.addElement(EXCLUDED_SUBTREES);         return (elements.elements());    }     /**     * Return the name of this attribute.     */    public String getName() {        return (NAME);    }     /**     * Merge additional name constraints with existing ones.     * This function is used in certification path processing     * to accumulate name constraints from successive certificates     * in the path.  Note that NameConstraints can never be     * expanded by a merge, just remain constant or become more     * limiting.     * <p>     * IETF RFC2459 specifies the processing of Name Constraints as     * follows:     * <p>     * (j)  If permittedSubtrees is present in the certificate, set the     * constrained subtrees state variable to the intersection of its     * previous value and the value indicated in the extension field.     * <p>     * (k)  If excludedSubtrees is present in the certificate, set the     * excluded subtrees state variable to the union of its previous     * value and the value indicated in the extension field.     * <p>     * @param newConstraints additional NameConstraints to be applied     * @throws IOException on error     */    public void merge(NameConstraintsExtension newConstraints)            throws IOException {         if (newConstraints == null) {            // absence of any explicit constraints implies unconstrained            return;        }         /*         * If excludedSubtrees is present in the certificate, set the         * excluded subtrees state variable to the union of its previous         * value and the value indicated in the extension field.         */         GeneralSubtrees newExcluded =                        (GeneralSubtrees)newConstraints.get(EXCLUDED_SUBTREES);        if (excluded == null) {            excluded = (newExcluded != null) ?                        (GeneralSubtrees)newExcluded.clone() : null;        } else {            if (newExcluded != null) {                // Merge new excluded with current excluded (union)                excluded.union(newExcluded);            }        }         /*         * If permittedSubtrees is present in the certificate, set the         * constrained subtrees state variable to the intersection of its         * previous value and the value indicated in the extension field.         */         GeneralSubtrees newPermitted =                (GeneralSubtrees)newConstraints.get(PERMITTED_SUBTREES);        if (permitted == null) {            permitted = (newPermitted != null) ?                        (GeneralSubtrees)newPermitted.clone() : null;        } else {            if (newPermitted != null) {                // Merge new permitted with current permitted (intersection)                newExcluded = permitted.intersect(newPermitted);                 // Merge new excluded subtrees to current excluded (union)                if (newExcluded != null) {                    if (excluded != null) {                        excluded.union(newExcluded);                    } else {                        excluded = (GeneralSubtrees)newExcluded.clone();                    }                }            }        }         // Optional optimization: remove permitted subtrees that are excluded.        // This is not necessary for algorithm correctness, but it makes        // subsequent operations on the NameConstraints faster and require        // less space.        if (permitted != null) {            permitted.reduce(excluded);        }         // The NameConstraints have been changed, so re-encode them.  Methods in        // this class assume that the encodings have already been done.        encodeThis();     }     /**     * check whether a certificate conforms to these NameConstraints.     * This involves verifying that the subject name and subjectAltName     * extension (critical or noncritical) is consistent with the permitted     * subtrees state variables.  Also verify that the subject name and     * subjectAltName extension (critical or noncritical) is consistent with     * the excluded subtrees state variables.     *     * @param cert X509Certificate to be verified     * @returns true if certificate verifies successfully     * @throws IOException on error     */    public boolean verify(X509Certificate cert) throws IOException {         if (cert == null) {            throw new IOException("Certificate is null");        }         // Calculate hasMin and hasMax booleans (if necessary)        if (!minMaxValid) {            calcMinMax();        }         if (hasMin) {            throw new IOException("Non-zero minimum BaseDistance in"                                + " name constraints not supported");        }         if (hasMax) {            throw new IOException("Maximum BaseDistance in"                                + " name constraints not supported");        }         X500Principal subjectPrincipal = cert.getSubjectX500Principal();        X500Name subject = X500Name.asX500Name(subjectPrincipal);         if (subject.isEmpty() == false) {            if (verify(subject) == false) {                return false;            }        }         GeneralNames altNames = null;        // extract altNames        try {            // extract extensions, if any, from certInfo            // following returns null if certificate contains no extensions            X509CertImpl certImpl = X509CertImpl.toImpl(cert);            SubjectAlternativeNameExtension altNameExt =                certImpl.getSubjectAlternativeNameExtension();            if (altNameExt != null) {                // extract altNames from extension; this call does not                // return an IOException on null altnames                altNames = (GeneralNames)                            (altNameExt.get(altNameExt.SUBJECT_NAME));            }        } catch (CertificateException ce) {            throw new IOException("Unable to extract extensions from " +                        "certificate: " + ce.getMessage());        }         // If there are no subjectAlternativeNames, perform the special-case        // check where if the subjectName contains any EMAILADDRESS        // attributes, they must be checked against RFC822 constraints.        // If that passes, we're fine.        if (altNames == null) {            return verifyRFC822SpecialCase(subject);        }         // verify each subjectAltName        for (int i = 0; i < altNames.size(); i++) {            GeneralNameInterface altGNI = altNames.get(i).getName();            if (!verify(altGNI)) {                return false;            }        }         // All tests passed.        return true;    }     /**     * check whether a name conforms to these NameConstraints.     * This involves verifying that the name is consistent with the     * permitted and excluded subtrees variables.     *     * @param name GeneralNameInterface name to be verified     * @returns true if certificate verifies successfully     * @throws IOException on error     */    public boolean verify(GeneralNameInterface name) throws IOException {        if (name == null) {            throw new IOException("name is null");        }         // Verify that the name is consistent with the excluded subtrees

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