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.asn1.x509.SubjectPublicKeyInfo;
024import org.bouncycastle.openssl.PEMException;
025import org.bouncycastle.openssl.PEMKeyPair;
026import org.bouncycastle.openssl.jcajce.JcaPEMKeyConverter;
027import org.crsh.ssh.util.KeyPairUtils;
028import org.slf4j.Logger;
029import org.slf4j.LoggerFactory;
030import java.io.FileInputStream;
031import java.io.InputStreamReader;
032import java.security.KeyPair;
033import java.security.PublicKey;
034import java.util.ArrayList;
035import java.util.List;
036
037/**
038 * A modified version of {@link org.apache.sshd.common.keyprovider.FileKeyPairProvider} that only load public keys
039 * either as {@link KeyPair} or as {@link PublicKey}.
040 *
041 * @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a>
042 */
043class FilePublicKeyProvider extends AbstractKeyPairProvider {
044
045  /** . */
046  private static final Logger LOG = LoggerFactory.getLogger(FilePublicKeyProvider.class);
047
048  /** . */
049  private String[] files;
050
051  FilePublicKeyProvider(String[] files) {
052    this.files = files;
053  }
054
055  public Iterable<KeyPair> loadKeys() {
056    if (!SecurityUtils.isBouncyCastleRegistered()) {
057      throw new IllegalStateException("BouncyCastle must be registered as a JCE provider");
058    }
059    List<KeyPair> keys = new ArrayList<KeyPair>();
060    for (String file : files) {
061      try {
062          Object o = KeyPairUtils.readKey(new InputStreamReader(new FileInputStream(file)));
063          if (o instanceof KeyPair) {
064            keys.add(new KeyPair(((KeyPair)o).getPublic(), null));
065          } else if (o instanceof PublicKey) {
066            keys.add(new KeyPair((PublicKey)o, null));
067          } else if (o instanceof PEMKeyPair) {
068            PEMKeyPair keyPair = (PEMKeyPair)o;
069            keys.add(convertPemKeyPair(keyPair));
070          } else if (o instanceof SubjectPublicKeyInfo) {
071            PEMKeyPair keyPair = new PEMKeyPair((SubjectPublicKeyInfo) o, null);
072            keys.add(convertPemKeyPair(keyPair));
073          } else {
074            throw new UnsupportedOperationException(String.format("Key type %s not supported.", o.getClass().getName()));
075          }
076      }
077      catch (Exception e) {
078        LOG.info("Unable to read key {}: {}", file, e);
079      }
080    }
081    return keys;
082  }
083
084  private KeyPair convertPemKeyPair(PEMKeyPair pemKeyPair) throws PEMException {
085    JcaPEMKeyConverter converter = new JcaPEMKeyConverter();
086    return new KeyPair(converter.getPublicKey(pemKeyPair.getPublicKeyInfo()), null);
087  }
088
089}