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 */
019package org.crsh.auth;
020
021import org.apache.sshd.common.keyprovider.AbstractKeyPairProvider;
022import org.apache.sshd.common.util.SecurityUtils;
023import org.bouncycastle.openssl.PEMReader;
024import org.bouncycastle.openssl.PasswordFinder;
025import org.slf4j.Logger;
026import org.slf4j.LoggerFactory;
027
028import java.io.FileInputStream;
029import java.io.InputStreamReader;
030import java.security.KeyPair;
031import java.security.PublicKey;
032import java.util.ArrayList;
033import java.util.List;
034
035/**
036 * A modified version of {@link org.apache.sshd.common.keyprovider.FileKeyPairProvider} that only load public keys
037 * either as {@link KeyPair} or as {@link PublicKey}.
038 *
039 * @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a>
040 */
041class FilePublicKeyProvider extends AbstractKeyPairProvider {
042
043  /** . */
044  private static final Logger LOG = LoggerFactory.getLogger(FilePublicKeyProvider.class);
045
046  /** . */
047  private String[] files;
048
049  /** . */
050  private PasswordFinder passwordFinder;
051
052  FilePublicKeyProvider(String[] files) {
053    this.files = files;
054  }
055
056  FilePublicKeyProvider(String[] files, PasswordFinder passwordFinder) {
057    this.files = files;
058    this.passwordFinder = passwordFinder;
059  }
060
061  public Iterable<KeyPair> loadKeys() {
062    if (!SecurityUtils.isBouncyCastleRegistered()) {
063      throw new IllegalStateException("BouncyCastle must be registered as a JCE provider");
064    }
065    List<KeyPair> keys = new ArrayList<KeyPair>();
066    for (String file : files) {
067      try {
068        PEMReader r = new PEMReader(new InputStreamReader(new FileInputStream(file)), passwordFinder);
069        try {
070          Object o = r.readObject();
071          if (o instanceof KeyPair) {
072            keys.add(new KeyPair(((KeyPair)o).getPublic(), null));
073          } else if (o instanceof PublicKey) {
074            keys.add(new KeyPair((PublicKey)o, null));
075          }
076        }
077        finally {
078          r.close();
079        }
080      }
081      catch (Exception e) {
082        LOG.info("Unable to read key {}: {}", file, e);
083      }
084    }
085    return keys;
086  }
087}