Java example source code file (XMLSecurityManager.java)

This example Java source code file (XMLSecurityManager.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

apiproperty, default, feature_secure_processing, fsp, invalid, jaxpdotproperties, limit, namemap, numberformatexception, object, state, string, systemproperty, xmlsecuritymanager

The XMLSecurityManager.java Java example source code

/*
 * Copyright (c) 2013, 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 com.sun.org.apache.xalan.internal.utils;

import com.sun.org.apache.xalan.internal.XalanConstants;


/**
 * This class is not the same as that in Xerces. It is used to manage the
 * state of corresponding Xerces properties and pass the values over to
 * the Xerces Security Manager.
 *
 * @author Joe Wang Oracle Corp.
 *
 */
public final class XMLSecurityManager {

    /**
     * States of the settings of a property, in the order: default value, value
     * set by FEATURE_SECURE_PROCESSING, jaxp.properties file, jaxp system
     * properties, and jaxp api properties
     */
    public static enum State {
        //this order reflects the overriding order

        DEFAULT("default"), FSP("FEATURE_SECURE_PROCESSING"),
        JAXPDOTPROPERTIES("jaxp.properties"), SYSTEMPROPERTY("system property"),
        APIPROPERTY("property");

        final String literal;
        State(String literal) {
            this.literal = literal;
        }

        String literal() {
            return literal;
        }
    }

    /**
     * Limits managed by the security manager
     */
    public static enum Limit {

        ENTITY_EXPANSION_LIMIT(XalanConstants.JDK_ENTITY_EXPANSION_LIMIT,
                XalanConstants.SP_ENTITY_EXPANSION_LIMIT, 0, 64000),
        MAX_OCCUR_NODE_LIMIT(XalanConstants.JDK_MAX_OCCUR_LIMIT,
                XalanConstants.SP_MAX_OCCUR_LIMIT, 0, 5000),
        ELEMENT_ATTRIBUTE_LIMIT(XalanConstants.JDK_ELEMENT_ATTRIBUTE_LIMIT,
                XalanConstants.SP_ELEMENT_ATTRIBUTE_LIMIT, 0, 10000),
        TOTAL_ENTITY_SIZE_LIMIT(XalanConstants.JDK_TOTAL_ENTITY_SIZE_LIMIT,
                XalanConstants.SP_TOTAL_ENTITY_SIZE_LIMIT, 0, 50000000),
        GENERAL_ENTITY_SIZE_LIMIT(XalanConstants.JDK_GENERAL_ENTITY_SIZE_LIMIT,
                XalanConstants.SP_GENERAL_ENTITY_SIZE_LIMIT, 0, 0),
        PARAMETER_ENTITY_SIZE_LIMIT(XalanConstants.JDK_PARAMETER_ENTITY_SIZE_LIMIT,
                XalanConstants.SP_PARAMETER_ENTITY_SIZE_LIMIT, 0, 1000000);

        final String apiProperty;
        final String systemProperty;
        final int defaultValue;
        final int secureValue;

        Limit(String apiProperty, String systemProperty, int value, int secureValue) {
            this.apiProperty = apiProperty;
            this.systemProperty = systemProperty;
            this.defaultValue = value;
            this.secureValue = secureValue;
        }

        public boolean equalsAPIPropertyName(String propertyName) {
            return (propertyName == null) ? false : apiProperty.equals(propertyName);
        }

        public boolean equalsSystemPropertyName(String propertyName) {
            return (propertyName == null) ? false : systemProperty.equals(propertyName);
        }

        public String apiProperty() {
            return apiProperty;
        }

        String systemProperty() {
            return systemProperty;
        }

        int defaultValue() {
            return defaultValue;
        }

        int secureValue() {
            return secureValue;
        }
    }

    /**
     * Map old property names with the new ones
     */
    public static enum NameMap {

        ENTITY_EXPANSION_LIMIT(XalanConstants.SP_ENTITY_EXPANSION_LIMIT,
                XalanConstants.ENTITY_EXPANSION_LIMIT),
        MAX_OCCUR_NODE_LIMIT(XalanConstants.SP_MAX_OCCUR_LIMIT,
                XalanConstants.MAX_OCCUR_LIMIT),
        ELEMENT_ATTRIBUTE_LIMIT(XalanConstants.SP_ELEMENT_ATTRIBUTE_LIMIT,
                XalanConstants.ELEMENT_ATTRIBUTE_LIMIT);
        final String newName;
        final String oldName;

        NameMap(String newName, String oldName) {
            this.newName = newName;
            this.oldName = oldName;
        }

        String getOldName(String newName) {
            if (newName.equals(this.newName)) {
                return oldName;
            }
            return null;
        }
    }
    /**
     * Values of the properties
     */
    private final int[] values;
    /**
     * States of the settings for each property
     */
    private State[] states;
    /**
     * States that determine if properties are set explicitly
     */
    private boolean[] isSet;


    /**
     * Index of the special entityCountInfo property
     */
    private int indexEntityCountInfo = 10000;
    private String printEntityCountInfo = "";

    /**
     * Default constructor. Establishes default values for known security
     * vulnerabilities.
     */
    public XMLSecurityManager() {
        this(false);
    }

    /**
     * Instantiate Security Manager in accordance with the status of
     * secure processing
     * @param secureProcessing
     */
    public XMLSecurityManager(boolean secureProcessing) {
        values = new int[Limit.values().length];
        states = new State[Limit.values().length];
        isSet = new boolean[Limit.values().length];
        for (Limit limit : Limit.values()) {
            if (secureProcessing) {
                values[limit.ordinal()] = limit.secureValue();
                states[limit.ordinal()] = State.FSP;
            } else {
                values[limit.ordinal()] = limit.defaultValue();
                states[limit.ordinal()] = State.DEFAULT;
            }
        }
        //read system properties or jaxp.properties
        readSystemProperties();
    }

    /**
     * Setting FEATURE_SECURE_PROCESSING explicitly
     */
    public void setSecureProcessing(boolean secure) {
        for (Limit limit : Limit.values()) {
            if (secure) {
                setLimit(limit.ordinal(), State.FSP, limit.secureValue());
            } else {
                setLimit(limit.ordinal(), State.FSP, limit.defaultValue());
            }
        }
    }

    /**
     * Set limit by property name and state
     * @param propertyName property name
     * @param state the state of the property
     * @param value the value of the property
     * @return true if the property is managed by the security manager; false
     *              if otherwise.
     */
    public boolean setLimit(String propertyName, State state, Object value) {
        int index = getIndex(propertyName);
        if (index > -1) {
            setLimit(index, state, value);
            return true;
        }
        return false;
    }

    /**
     * Set the value for a specific limit.
     *
     * @param limit the limit
     * @param state the state of the property
     * @param value the value of the property
     */
    public void setLimit(Limit limit, State state, int value) {
        setLimit(limit.ordinal(), state, value);
    }

    /**
     * Set the value of a property by its index
     *
     * @param index the index of the property
     * @param state the state of the property
     * @param value the value of the property
     */
    public void setLimit(int index, State state, Object value) {
        if (index == indexEntityCountInfo) {
            //if it's explicitly set, it's treated as yes no matter the value
            printEntityCountInfo = (String)value;
        } else {
            int temp = 0;
            try {
                temp = Integer.parseInt((String) value);
                if (temp < 0) {
                    temp = 0;
                }
            } catch (NumberFormatException e) {}
            setLimit(index, state, temp);        }
    }

    /**
     * Set the value of a property by its index
     *
     * @param index the index of the property
     * @param state the state of the property
     * @param value the value of the property
     */
    public void setLimit(int index, State state, int value) {
        if (index == indexEntityCountInfo) {
            //if it's explicitly set, it's treated as yes no matter the value
            printEntityCountInfo = XalanConstants.JDK_YES;
        } else {
            //only update if it shall override
            if (state.compareTo(states[index]) >= 0) {
                values[index] = value;
                states[index] = state;
                isSet[index] = true;
            }
        }
    }


    /**
     * Return the value of the specified property.
     *
     * @param propertyName the property name
     * @return the value of the property as a string. If a property is managed
     * by this manager, its value shall not be null.
     */
    public String getLimitAsString(String propertyName) {
        int index = getIndex(propertyName);
        if (index > -1) {
            return getLimitValueByIndex(index);
        }

        return null;
    }

    /**
     * Return the value of a property by its ordinal
     *
     * @param limit the property
     * @return value of a property
     */
    public String getLimitValueAsString(Limit limit) {
        return Integer.toString(values[limit.ordinal()]);
    }

    /**
     * Return the value of the specified property
     *
     * @param limit the property
     * @return the value of the property
     */
    public int getLimit(Limit limit) {
        return values[limit.ordinal()];
    }

    /**
     * Return the value of a property by its ordinal
     *
     * @param index the index of a property
     * @return value of a property
     */
    public int getLimitByIndex(int index) {
        return values[index];
    }
    /**
     * Return the value of a property by its index
     *
     * @param index the index of a property
     * @return limit of a property as a string
     */
    public String getLimitValueByIndex(int index) {
        if (index == indexEntityCountInfo) {
            return printEntityCountInfo;
        }

        return Integer.toString(values[index]);
    }
    /**
     * Return the state of the limit property
     *
     * @param limit the limit
     * @return the state of the limit property
     */
    public State getState(Limit limit) {
        return states[limit.ordinal()];
    }

    /**
     * Return the state of the limit property
     *
     * @param limit the limit
     * @return the state of the limit property
     */
    public String getStateLiteral(Limit limit) {
        return states[limit.ordinal()].literal();
    }

    /**
     * Get the index by property name
     *
     * @param propertyName property name
     * @return the index of the property if found; return -1 if not
     */
    public int getIndex(String propertyName) {
        for (Limit limit : Limit.values()) {
            if (limit.equalsAPIPropertyName(propertyName)) {
                //internally, ordinal is used as index
                return limit.ordinal();
            }
        }
        //special property to return entity count info
        if (propertyName.equals(XalanConstants.JDK_ENTITY_COUNT_INFO)) {
            return indexEntityCountInfo;
        }
        return -1;
    }

    /**
     * Indicate if a property is set explicitly
     * @param index
     * @return
     */
    public boolean isSet(int index) {
        return isSet[index];
    }

    public boolean printEntityCountInfo() {
        return printEntityCountInfo.equals(XalanConstants.JDK_YES);
    }
    /**
     * Read from system properties, or those in jaxp.properties
     */
    private void readSystemProperties() {

        for (Limit limit : Limit.values()) {
            if (!getSystemProperty(limit, limit.systemProperty())) {
                //if system property is not found, try the older form if any
                for (NameMap nameMap : NameMap.values()) {
                    String oldName = nameMap.getOldName(limit.systemProperty());
                    if (oldName != null) {
                        getSystemProperty(limit, oldName);
                    }
                }
            }
        }

    }

    /**
     * Read from system properties, or those in jaxp.properties
     *
     * @param property the type of the property
     * @param sysPropertyName the name of system property
     */
    private boolean getSystemProperty(Limit limit, String sysPropertyName) {
        try {
            String value = SecuritySupport.getSystemProperty(sysPropertyName);
            if (value != null && !value.equals("")) {
                values[limit.ordinal()] = Integer.parseInt(value);
                states[limit.ordinal()] = State.SYSTEMPROPERTY;
                return true;
            }

            value = SecuritySupport.readJAXPProperty(sysPropertyName);
            if (value != null && !value.equals("")) {
                values[limit.ordinal()] = Integer.parseInt(value);
                states[limit.ordinal()] = State.JAXPDOTPROPERTIES;
                return true;
            }
        } catch (NumberFormatException e) {
            //invalid setting
            throw new NumberFormatException("Invalid setting for system property: " + limit.systemProperty());
        }
        return false;
    }
}