/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.oncrpc.security;
import org.apache.hadoop.oncrpc.XDR;
/**
* Base class for verifier. Currently our authentication only supports 3 types
* of auth flavors: {@link RpcAuthInfo.AuthFlavor#AUTH_NONE}, {@link RpcAuthInfo.AuthFlavor#AUTH_SYS},
* and {@link RpcAuthInfo.AuthFlavor#RPCSEC_GSS}. Thus for verifier we only need to handle
* AUTH_NONE and RPCSEC_GSS
*/
public abstract class Verifier extends RpcAuthInfo {
public static final Verifier VERIFIER_NONE = new VerifierNone();
protected Verifier(AuthFlavor flavor) {
super(flavor);
}
/** Read both AuthFlavor and the verifier from the XDR */
public static Verifier readFlavorAndVerifier(XDR xdr) {
AuthFlavor flavor = AuthFlavor.fromValue(xdr.readInt());
final Verifier verifer;
if(flavor == AuthFlavor.AUTH_NONE) {
verifer = new VerifierNone();
} else if(flavor == AuthFlavor.RPCSEC_GSS) {
verifer = new VerifierGSS();
} else {
throw new UnsupportedOperationException("Unsupported verifier flavor"
+ flavor);
}
verifer.read(xdr);
return verifer;
}
/**
* Write AuthFlavor and the verifier to the XDR
*/
public static void writeFlavorAndVerifier(Verifier verifier, XDR xdr) {
if (verifier instanceof VerifierNone) {
xdr.writeInt(AuthFlavor.AUTH_NONE.getValue());
} else if (verifier instanceof VerifierGSS) {
xdr.writeInt(AuthFlavor.RPCSEC_GSS.getValue());
} else {
throw new UnsupportedOperationException("Cannot recognize the verifier");
}
verifier.write(xdr);
}
}