| /* |
| * Copyright (c) 2005, 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. |
| * |
| * 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. |
| */ |
| |
| import java.io.*; |
| import java.util.*; |
| import java.security.MessageDigest; |
| import javax.xml.crypto.*; |
| import javax.xml.crypto.dsig.*; |
| import javax.xml.crypto.dsig.dom.DOMValidateContext; |
| import javax.xml.crypto.dom.*; |
| import javax.xml.parsers.DocumentBuilderFactory; |
| import javax.xml.parsers.DocumentBuilder; |
| import org.w3c.dom.Document; |
| import org.w3c.dom.Node; |
| import org.w3c.dom.NodeList; |
| import org.w3c.dom.Element; |
| |
| /** |
| * This is a class which performs xml signature validation upon request |
| */ |
| class SignatureValidator { |
| |
| private File dir; |
| |
| SignatureValidator(File base) { |
| dir = base; |
| } |
| |
| boolean validate(String fn, KeySelector ks, boolean cache) |
| throws Exception { |
| return validate(fn, ks, null, cache); |
| } |
| |
| boolean validate(String fn, KeySelector ks, URIDereferencer ud, |
| boolean cache) throws Exception { |
| |
| DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); |
| dbf.setNamespaceAware(true); |
| dbf.setValidating(false); |
| Document doc = dbf.newDocumentBuilder().parse(new File(dir, fn)); |
| NodeList nl = |
| doc.getElementsByTagNameNS(XMLSignature.XMLNS, "Signature"); |
| if (nl.getLength() == 0) { |
| throw new Exception("Couldn't find signature Element"); |
| } |
| Element sigElement = (Element) nl.item(0); |
| DOMValidateContext vc = new DOMValidateContext(ks, sigElement); |
| vc.setBaseURI(dir.toURI().toString()); |
| if (cache) { |
| vc.setProperty("javax.xml.crypto.dsig.cacheReference", Boolean.TRUE); |
| } |
| XMLSignatureFactory factory = XMLSignatureFactory.getInstance(); |
| XMLSignature signature = factory.unmarshalXMLSignature(vc); |
| if (ud != null) { |
| vc.setURIDereferencer(ud); |
| } |
| boolean coreValidity = signature.validate(vc); |
| |
| // Check reference cache |
| if (cache) { |
| Iterator<Reference> i = |
| signature.getSignedInfo().getReferences().iterator(); |
| for (int j = 0; i.hasNext(); j++) { |
| Reference ref = i.next(); |
| if (!digestInputEqual(ref)) { |
| throw new Exception |
| ("cached data for Reference[" + j + "] is not correct"); |
| } |
| // check that dereferenced data does not contain comment nodes |
| if (ref.getURI() == "") { |
| System.out.println("checking deref data"); |
| @SuppressWarnings("unchecked") |
| NodeSetData<Node> data = |
| (NodeSetData<Node>)ref.getDereferencedData(); |
| for (Node n : data) { |
| if (n.getNodeType() == Node.COMMENT_NODE) { |
| throw new Exception("dereferenced data for " + |
| " Reference[" + j + " contains comment node"); |
| } |
| } |
| } |
| } |
| } |
| return coreValidity; |
| } |
| |
| private boolean digestInputEqual(Reference ref) throws Exception { |
| MessageDigest md = MessageDigest.getInstance("SHA1"); |
| InputStream is = ref.getDigestInputStream(); |
| int nbytes; |
| byte[] buf = new byte[256]; |
| while ((nbytes = is.read(buf, 0, buf.length)) != -1) { |
| md.update(buf, 0, nbytes); |
| } |
| return Arrays.equals(md.digest(), ref.getDigestValue()); |
| } |
| } |