355 lines
12 KiB
Java
355 lines
12 KiB
Java
/* CodeSource.java -- Code location and certifcates
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Copyright (C) 1998, 2002, 2004 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.security;
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import java.io.ByteArrayInputStream;
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import java.io.IOException;
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import java.io.ObjectInputStream;
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import java.io.ObjectOutputStream;
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import java.io.Serializable;
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import java.net.SocketPermission;
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import java.net.URL;
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// Note that this overrides Certificate in this package.
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import java.security.cert.Certificate;
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import java.security.cert.CertificateEncodingException;
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import java.security.cert.CertificateException;
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import java.security.cert.CertificateFactory;
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import java.util.Arrays;
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import java.util.HashSet;
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import java.util.Iterator;
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/**
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* This class represents a location from which code is loaded (as
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* represented by a URL), and the list of certificates that are used to
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* check the signatures of signed code loaded from this source.
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*
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* @author Aaron M. Renn (arenn@urbanophile.com)
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* @author Eric Blake (ebb9@email.byu.edu)
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* @since 1.1
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* @status updated to 1.4
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*/
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public class CodeSource implements Serializable
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{
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/**
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* Compatible with JDK 1.1+.
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*/
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private static final long serialVersionUID = 4977541819976013951L;
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/**
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* This is the URL that represents the code base from which code will
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* be loaded.
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*
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* @serial the code location
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*/
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private final URL location;
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/** The set of certificates for this code base. */
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private transient HashSet certs;
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/**
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* This creates a new instance of <code>CodeSource</code> that loads code
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* from the specified URL location and which uses the specified certificates
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* for verifying signatures.
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*
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* @param location the location from which code will be loaded
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* @param certs the list of certificates
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*/
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public CodeSource(URL location, Certificate[] certs)
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{
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this.location = location;
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if (certs != null)
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this.certs = new HashSet(Arrays.asList(certs));
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}
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/**
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* This method returns a hash value for this object.
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*
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* @return a hash value for this object
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*/
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public int hashCode()
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{
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return (location == null ? 0 : location.hashCode())
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^ (certs == null ? 0 : certs.hashCode());
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}
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/**
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* This method tests the specified <code>Object</code> for equality with
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* this object. This will be true if and only if the locations are equal
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* and the certificate sets are identical (ignoring order).
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*
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* @param obj the <code>Object</code> to test against
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* @return true if the specified object is equal to this one
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*/
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public boolean equals(Object obj)
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{
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if (! (obj instanceof CodeSource))
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return false;
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CodeSource cs = (CodeSource) obj;
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return (certs == null ? cs.certs == null : certs.equals(cs.certs))
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&& (location == null ? cs.location == null
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: location.equals(cs.location));
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}
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/**
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* This method returns the URL specifying the location from which code
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* will be loaded under this <code>CodeSource</code>.
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*
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* @return the code location for this <code>CodeSource</code>
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*/
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public final URL getLocation()
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{
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return location;
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}
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/**
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* This method returns the list of digital certificates that can be used
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* to verify the signatures of code loaded under this
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* <code>CodeSource</code>.
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*
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* @return the certifcate list for this <code>CodeSource</code>
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*/
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public final Certificate[] getCertificates()
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{
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if (certs == null)
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return null;
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Certificate[] c = new Certificate[certs.size()];
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certs.toArray(c);
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return c;
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}
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/**
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* This method tests to see if a specified <code>CodeSource</code> is
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* implied by this object. Effectively, to meet this test, the specified
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* object must have all the certifcates this object has (but may have more),
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* and must have a location that is a subset of this object's. In order
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* for this object to imply the specified object, the following must be
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* true:
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*
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* <ol>
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* <li><em>codesource</em> must not be <code>null</code>.</li>
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* <li>If <em>codesource</em> has a certificate list, all of it's
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* certificates must be present in the certificate list of this
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* code source.</li>
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* <li>If this object does not have a <code>null</code> location, then
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* the following addtional tests must be passed.
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*
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* <ol>
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* <li><em>codesource</em> must not have a <code>null</code>
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* location.</li>
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* <li><em>codesource</em>'s location must be equal to this object's
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* location, or
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* <ul>
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* <li><em>codesource</em>'s location protocol, port, and ref (aka,
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* anchor) must equal this objects</li>
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* <li><em>codesource</em>'s location host must imply this object's
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* location host, as determined by contructing
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* <code>SocketPermission</code> objects from each with no
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* action list and using that classes's <code>implies</code>
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* method</li>
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* <li>If this object's location file ends with a '/', then the
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* specified object's location file must start with this
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* object's location file. Otherwise, the specified object's
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* location file must start with this object's location file
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* with the '/' character appended to it.</li>
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* </ul></li>
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* </ol></li>
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* </ol>
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*
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* <p>For example, each of these locations imply the location
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* "http://java.sun.com/classes/foo.jar":</p>
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*
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* <pre>
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* http:
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* http://*.sun.com/classes/*
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* http://java.sun.com/classes/-
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* http://java.sun.com/classes/foo.jar
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* </pre>
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*
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* <p>Note that the code source with null location and null certificates implies
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* all other code sources.</p>
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*
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* @param cs the <code>CodeSource</code> to test against this object
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* @return true if this specified <code>CodeSource</code> is implied
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*/
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public boolean implies(CodeSource cs)
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{
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if (cs == null)
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return false;
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// First check the certificate list.
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if (certs != null && (cs.certs == null || ! certs.containsAll(cs.certs)))
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return false;
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// Next check the location.
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if (location == null)
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return true;
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if (cs.location == null
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|| ! location.getProtocol().equals(cs.location.getProtocol())
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|| (location.getPort() != -1
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&& location.getPort() != cs.location.getPort())
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|| (location.getRef() != null
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&& ! location.getRef().equals(cs.location.getRef())))
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return false;
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if (location.getHost() != null)
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{
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String their_host = cs.location.getHost();
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if (their_host == null)
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return false;
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SocketPermission our_sockperm =
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new SocketPermission(location.getHost(), "accept");
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SocketPermission their_sockperm =
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new SocketPermission(their_host, "accept");
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if (! our_sockperm.implies(their_sockperm))
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return false;
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}
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String our_file = location.getFile();
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if (our_file != null)
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{
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if (! our_file.endsWith("/"))
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our_file += "/";
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String their_file = cs.location.getFile();
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if (their_file == null
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|| ! their_file.startsWith(our_file))
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return false;
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}
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return true;
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}
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/**
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* This method returns a <code>String</code> that represents this object.
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* The result is in the format <code>"(" + getLocation()</code> followed
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* by a space separated list of certificates (or "<no certificates>"),
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* followed by <code>")"</code>.
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*
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* @return a <code>String</code> for this object
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*/
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public String toString()
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{
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StringBuffer sb = new StringBuffer("(").append(location);
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if (certs == null || certs.isEmpty())
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sb.append(" <no certificates>");
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else
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{
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Iterator iter = certs.iterator();
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for (int i = certs.size(); --i >= 0; )
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sb.append(' ').append(iter.next());
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}
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return sb.append(")").toString();
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}
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/**
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* Reads this object from a serialization stream.
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*
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* @param s the input stream
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* @throws IOException if reading fails
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* @throws ClassNotFoundException if deserialization fails
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* @serialData this reads the location, then expects an int indicating the
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* number of certificates. Each certificate is a String type
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* followed by an int encoding length, then a byte[] encoding
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*/
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private void readObject(ObjectInputStream s)
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throws IOException, ClassNotFoundException
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{
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s.defaultReadObject();
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int count = s.readInt();
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certs = new HashSet();
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while (--count >= 0)
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{
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String type = (String) s.readObject();
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int bytes = s.readInt();
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byte[] encoded = new byte[bytes];
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for (int i = 0; i < bytes; i++)
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encoded[i] = s.readByte();
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ByteArrayInputStream stream = new ByteArrayInputStream(encoded);
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try
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{
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CertificateFactory factory = CertificateFactory.getInstance(type);
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certs.add(factory.generateCertificate(stream));
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}
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catch (CertificateException e)
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{
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// XXX Should we ignore this certificate?
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}
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}
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}
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/**
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* Writes this object to a serialization stream.
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*
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* @param s the output stream
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* @throws IOException if writing fails
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* @serialData this writes the location, then writes an int indicating the
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* number of certificates. Each certificate is a String type
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* followed by an int encoding length, then a byte[] encoding
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*/
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private void writeObject(ObjectOutputStream s) throws IOException
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{
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s.defaultWriteObject();
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if (certs == null)
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s.writeInt(0);
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else
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{
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int count = certs.size();
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s.writeInt(count);
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Iterator iter = certs.iterator();
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while (--count >= 0)
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{
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Certificate c = (Certificate) iter.next();
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s.writeObject(c.getType());
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byte[] encoded;
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try
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{
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encoded = c.getEncoded();
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}
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catch (CertificateEncodingException e)
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{
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// XXX Should we ignore this certificate?
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encoded = null;
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}
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if (encoded == null)
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s.writeInt(0);
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else
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{
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s.writeInt(encoded.length);
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for (int i = 0; i < encoded.length; i++)
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s.writeByte(encoded[i]);
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}
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}
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}
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}
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} // class CodeSource
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