hadoop Verifier 源码
haddop Verifier 代码
文件路径：/hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/oncrpc/security/Verifier.java
/**
* 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 {
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.AUTH_SYS) {
// Added in HADOOP-15307 based on HDFS-5085:
// When the auth flavor is AUTH_SYS, the corresponding verifier is
// AUTH_NONE. I.e., it is impossible to have a verifier with auth
// flavor AUTH_SYS.
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);
}
}
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