| /** |
| * 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. |
| * @param xdr XDR message |
| * @return verifier |
| */ |
| 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. |
| * @param verifier written to XDR |
| * @param xdr XDR message |
| */ |
| 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); |
| } |
| } |