001    /*
002     * Copyright (C) 2012 eXo Platform SAS.
003     *
004     * This is free software; you can redistribute it and/or modify it
005     * under the terms of the GNU Lesser General Public License as
006     * published by the Free Software Foundation; either version 2.1 of
007     * the License, or (at your option) any later version.
008     *
009     * This software is distributed in the hope that it will be useful,
010     * but WITHOUT ANY WARRANTY; without even the implied warranty of
011     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012     * Lesser General Public License for more details.
013     *
014     * You should have received a copy of the GNU Lesser General Public
015     * License along with this software; if not, write to the Free
016     * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
017     * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
018     */
019    package org.crsh.ssh.term;
020    
021    import org.apache.sshd.common.keyprovider.AbstractKeyPairProvider;
022    import org.apache.sshd.common.util.SecurityUtils;
023    import org.bouncycastle.openssl.PEMReader;
024    import org.crsh.vfs.Resource;
025    
026    import java.io.ByteArrayInputStream;
027    import java.io.InputStreamReader;
028    import java.security.KeyPair;
029    import java.util.ArrayList;
030    import java.util.List;
031    import java.util.logging.Level;
032    import java.util.logging.Logger;
033    
034    public class URLKeyPairProvider extends AbstractKeyPairProvider {
035    
036      /** . */
037      private static final Logger log = Logger.getLogger(URLKeyPairProvider.class.getName());
038    
039      /** . */
040      private final Resource key;
041    
042      public URLKeyPairProvider(Resource key) {
043        this.key = key;
044      }
045    
046      @Override
047      protected KeyPair[] loadKeys() {
048        if (!SecurityUtils.isBouncyCastleRegistered()) {
049          throw new IllegalStateException("BouncyCastle must be registered as a JCE provider");
050        }
051        List<KeyPair> keys = new ArrayList<KeyPair>();
052        if (key != null) {
053          try {
054            PEMReader r = new PEMReader(new InputStreamReader(new ByteArrayInputStream(key.getContent())));
055            try {
056              Object o = r.readObject();
057              if (o instanceof KeyPair) {
058                keys.add((KeyPair) o);
059              }
060            } finally {
061              r.close();
062            }
063          } catch (Exception e) {
064            log.log(Level.INFO, "Unable to read key " + key + ": " + key, e);
065          }
066        }
067        return keys.toArray(new KeyPair[keys.size()]);
068      }
069    }