317 lines
9.4 KiB
Java
317 lines
9.4 KiB
Java
/* CodeSource.java -- Code location and certifcates
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Copyright (C) 1998 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., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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As a special exception, if you link this library with other files to
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produce an executable, this library does not by itself cause the
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resulting executable to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why the
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executable file might be covered by the GNU General Public License. */
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package java.security;
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import java.io.Serializable;
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import java.net.URL;
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import java.net.SocketPermission;
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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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* @version 0.0
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*
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* @author Aaron M. Renn (arenn@urbanophile.com)
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*/
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public class CodeSource implements Serializable
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{
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private static final String linesep = System.getProperty("line.separator");
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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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private URL location;
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/**
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* This is the list of certificates for this code base
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*/
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// What is the serialized form of this?
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private java.security.cert.Certificate[] certs;
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/**
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* This method initializes a new instance of <code>CodeSource</code> that
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* loads code from the specified URL location and which uses the
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* specified certificates 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 used for verifying signatures on code from this source
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*/
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public CodeSource(URL location, java.security.cert.Certificate[] certs)
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{
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this.location = location;
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this.certs = certs;
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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 <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 java.security.cert.Certificate[] getCertificates()
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{
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return certs;
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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
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* more) 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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* <p>
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* <ol>
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* <li>The specified <code>CodeSource</code> must not be <code>null</code>.
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* <li>If the specified <code>CodeSource</code> has a certificate list,
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* all of that object's certificates must be present in the certificate
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* list of this object.
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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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* <ol>
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* <li>The specified <code>CodeSource</code> must not have a <code>null</code> location.
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* <li>The specified <code>CodeSource</code>'s location must be equal to
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* this object's location, or<br>
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* <ul>
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* <li>The specifiec <code>CodeSource</code>'s location protocol, port,
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* and ref (aka, anchor) must equal this objects, and
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* <li>The specified <code>CodeSource</code>'s location host must imply this
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* object's location host, as determined by contructing
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* <code>SocketPermission</code> objects from each with no action list and
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* using that classes's <code>implies</code> method. And,
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* <li>If this object's location file ends with a '/', then the specified
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* object's location file must start with this object's location file.
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* Otherwise, the specified object's location file must start with this
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* object's location file with the '/' character appended to it.
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* </ul>
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* </ol>
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* </ol>
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*
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* @param cs The <code>CodeSource</code> to test against this object
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*
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* @return <code>true</code> if this specified <code>CodeSource</code> is specified by this object, <code>false</code> otherwise.
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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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java.security.cert.Certificate[] their_certs = cs.getCertificates();
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java.security.cert.Certificate[] our_certs = getCertificates();
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if (our_certs != null)
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{
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if (their_certs == null)
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return false;
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for (int i = 0; i < our_certs.length; i++)
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{
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int j;
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for (j = 0; j < their_certs.length; j++)
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if (our_certs[i].equals(their_certs[j]))
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break;
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if (j == their_certs.length)
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return false;
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}
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}
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// Next check the location
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URL their_loc = getLocation();
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URL our_loc = getLocation();
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if (our_loc == null)
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return true;
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else if (their_loc == null)
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return false;
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if (!our_loc.getProtocol().equals(their_loc.getProtocol()))
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return false;
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if (our_loc.getPort() != -1)
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if (our_loc.getPort() != their_loc.getPort())
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return false;
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if (our_loc.getRef() != null)
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if (!our_loc.getRef().equals(their_loc.getRef()))
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return false;
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// See javadoc comments for what we are doing here.
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if (our_loc.getHost() != null)
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{
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String their_host = their_loc.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(our_loc.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 = our_loc.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 = our_file + "/";
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String their_file = their_loc.getFile();
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if (their_file == null)
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return false;
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if (!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 tests the specified <code>Object</code> for equality with
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* this object. This will be true if and only if:
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* <p>
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* <ul>
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* <li>The specified object is not <code>null</code>.
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* <li>The specified object is an instance of <code>CodeSource</code>.
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* <li>The specified object's location is the same as this object's.
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* <li>The specified object's certificate list contains the exact same
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* entries as the object's. Note that the order of the certificate lists
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* is not significant.
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* </ul>
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*
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* @param obj The <code>Object</code> to test against.
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*
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* @return <code>true</code> if the specified object is equal to this one, <code>false</code> otherwise.
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*/
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public boolean equals(Object obj)
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{
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if (obj == null)
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return false;
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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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// First check the certificate list
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java.security.cert.Certificate[] their_certs = cs.getCertificates();
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java.security.cert.Certificate[] our_certs = getCertificates();
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if ((our_certs == null) && (their_certs != null))
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return false;
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else if ((our_certs != null) && (their_certs == null))
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return false;
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if (our_certs != null)
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{
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if (our_certs.length != their_certs.length)
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return false;
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for (int i = 0; i < our_certs.length; i++)
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{
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int j;
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for (j = 0; j < their_certs.length; j++)
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if (our_certs[i].equals(their_certs[j]))
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break;
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if (j == their_certs.length)
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return false;
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}
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}
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// Now the location
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URL their_loc = cs.getLocation();
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URL our_loc = getLocation();
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if ((our_loc == null) && (their_loc != null))
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return false;
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if (!our_loc.equals(their_loc))
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return false;
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return true;
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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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URL location = getLocation();
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if (location == null)
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return System.identityHashCode(this);
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return location.hashCode();
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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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* This <code>String</code> will contain the object's hash code, location,
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* and certificate list.
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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("");
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sb.append(super.toString() + " (" + linesep);
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sb.append("Location: " + getLocation() + linesep);
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java.security.cert.Certificate[] certs = getCertificates();
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if (certs == null)
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sb.append("<none>" + linesep);
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else
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for (int i = 0; i < certs.length; i++)
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sb.append(certs[i] + linesep);
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sb.append(")" + linesep);
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return sb.toString();
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}
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}
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