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/**
* Copyright (c) 2012, 2017 Gunnar Wagenknecht and others.
* All rights reserved.
*
* This program and the accompanying materials are made available under the terms of the
* Eclipse Public License 2.0 which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Gunnar Wagenknecht - initial API and implementation
*/
package org.eclipse.equinox.console.internal.ssh;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.security.PublicKey;
import java.security.interfaces.DSAPublicKey;
import java.security.interfaces.RSAPublicKey;
import org.apache.sshd.server.PublickeyAuthenticator;
import org.apache.sshd.server.session.ServerSession;
/**
* {@link PublickeyAuthenticator} which authenticates using a specified
* {@link #setAuthorizedKeysFile(String) authorized_keys} file.
*/
public class AuthorizedKeysFileAuthenticator implements PublickeyAuthenticator {
private String authorizedKeysFile;
public String getAuthorizedKeysFile() {
return authorizedKeysFile;
}
public void setAuthorizedKeysFile(String authorizedKeysFile) {
this.authorizedKeysFile = authorizedKeysFile;
}
@Override
public boolean authenticate(String username, PublicKey key, ServerSession session) {
String authorizedKeysFile = getAuthorizedKeysFile();
if(null == authorizedKeysFile) {
// TODO should use better logging than System.err?
System.err.println("No authorized_keys file configured!");
return false;
}
try {
// dynamically read key file at each login attempt
AuthorizedKeys keys = new AuthorizedKeys(authorizedKeysFile);
for (PublicKey authorizedKey : keys.getKeys()) {
if (isSameKey(authorizedKey, key)) {
return true;
}
}
} catch (FileNotFoundException e) {
// TODO should use better logging than System.err?
System.err.println("Configured authorized_keys file not found! " + e.getMessage());
} catch (IOException e) {
// TODO should use better logging than System.err?
System.err.println("Please check authorized_keys file! " + e.getMessage());
}
return false;
}
private boolean isSameKey(PublicKey k1, PublicKey k2) throws IOException {
if ((k1 instanceof DSAPublicKey) && (k2 instanceof DSAPublicKey)) {
return isSameDSAKey((DSAPublicKey) k1, (DSAPublicKey) k2);
} else if ((k1 instanceof RSAPublicKey) && (k2 instanceof RSAPublicKey)) {
return isSameRSAKey((RSAPublicKey) k1, (RSAPublicKey) k2);
} else {
throw new IOException("Unsupported key types detected!");
}
}
private boolean isSameRSAKey(RSAPublicKey k1, RSAPublicKey k2) {
return k1.getPublicExponent().equals(k2.getPublicExponent()) && k1.getModulus().equals(k2.getModulus());
}
private boolean isSameDSAKey(DSAPublicKey k1, DSAPublicKey k2) {
return k1.getY().equals(k2.getY()) && k1.getParams().getG().equals(k2.getParams().getG()) && k1.getParams().getP().equals(k2.getParams().getP()) && k1.getParams().getQ().equals(k2.getParams().getQ());
}
}
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