/*
* Copyright (C) 2012 eXo Platform SAS.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.crsh.auth;
import org.apache.sshd.common.KeyPairProvider;
import org.crsh.plugin.CRaSHPlugin;
import org.crsh.plugin.PropertyDescriptor;
import java.io.File;
import java.security.KeyPair;
import java.security.PublicKey;
import java.util.Arrays;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Set;
import java.util.logging.Level;
/** @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a> */
public class KeyAuthenticationPlugin extends CRaSHPlugin<KeyAuthenticationPlugin> implements AuthenticationPlugin<PublicKey> {
/** . */
private static final String[] TYPES = { KeyPairProvider.SSH_DSS, KeyPairProvider.SSH_RSA };
/** The SSH authorized key path. */
public static final PropertyDescriptor<String> AUTHORIZED_KEY_PATH = PropertyDescriptor.create(
"auth.key.path",
(String)null,
"The path to the authorized key file");
/** . */
private Set<PublicKey> authorizedKeys = Collections.emptySet();
@Override
protected Iterable<PropertyDescriptor<?>> createConfigurationCapabilities() {
return Arrays.<PropertyDescriptor<?>>asList(AUTHORIZED_KEY_PATH);
}
public String getName() {
return "key";
}
@Override
public KeyAuthenticationPlugin getImplementation() {
return this;
}
public Class<PublicKey> getCredentialType() {
return PublicKey.class;
}
@Override
public void init() {
String authorizedKeyPath = getContext().getProperty(AUTHORIZED_KEY_PATH);
if (authorizedKeyPath != null) {
File f = new File(authorizedKeyPath);
if (f.exists() && f.isFile()) {
log.log(Level.FINE, "Found authorized key path " + authorizedKeyPath);
Set<PublicKey> keys;
keys = new LinkedHashSet<PublicKey>();
KeyPairProvider provider = new FilePublicKeyProvider(new String[]{authorizedKeyPath});
for (String type : TYPES) {
KeyPair pair = provider.loadKey(type);
if (pair != null) {
PublicKey key = pair.getPublic();
if (key != null) {
keys.add(key);
}
}
}
authorizedKeys = keys;
} else {
log.log(Level.FINE, "Ignoring invalid authorized key path " + authorizedKeyPath);
}
}
}
public boolean authenticate(String username, PublicKey credential) throws Exception {
if (authorizedKeys.contains(credential)) {
log.log(Level.FINE, "Authenticated " + username + " with public key " + credential);
return true;
} else {
log.log(Level.FINE, "Denied " + username + " with public key " + credential);
return false;
}
}
}