org.apache.accumulo.core.rpc.SaslClientDigestCallbackHandler.java Source code

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Here is the source code for org.apache.accumulo.core.rpc.SaslClientDigestCallbackHandler.java

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/*
 * 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.accumulo.core.rpc;

import static java.util.Objects.requireNonNull;

import java.util.Arrays;

import javax.security.auth.callback.Callback;
import javax.security.auth.callback.NameCallback;
import javax.security.auth.callback.PasswordCallback;
import javax.security.auth.callback.UnsupportedCallbackException;
import javax.security.sasl.RealmCallback;
import javax.security.sasl.RealmChoiceCallback;

import org.apache.accumulo.core.client.impl.DelegationTokenImpl;
import org.apache.commons.lang.builder.HashCodeBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Client-side callbackhandler for sasl authentication which is the client-side sibling to the server-side {@link SaslDigestCallbackHandler}. Encoding of name,
 * password and realm information must be consistent across the pair.
 */
public class SaslClientDigestCallbackHandler extends SaslDigestCallbackHandler {
    private static final Logger log = LoggerFactory.getLogger(SaslClientDigestCallbackHandler.class);
    private static final String NAME = SaslClientDigestCallbackHandler.class.getSimpleName();

    private final String userName;
    private final char[] userPassword;

    public SaslClientDigestCallbackHandler(DelegationTokenImpl token) {
        requireNonNull(token);
        this.userName = encodeIdentifier(token.getIdentifier().getBytes());
        this.userPassword = encodePassword(token.getPassword());
    }

    public SaslClientDigestCallbackHandler(String userName, char[] userPassword) {
        requireNonNull(userName);
        requireNonNull(userPassword);
        this.userName = userName;
        this.userPassword = userPassword;
    }

    @Override
    public void handle(Callback[] callbacks) throws UnsupportedCallbackException {
        NameCallback nc = null;
        PasswordCallback pc = null;
        RealmCallback rc = null;
        for (Callback callback : callbacks) {
            if (callback instanceof RealmChoiceCallback) {
                continue;
            } else if (callback instanceof NameCallback) {
                nc = (NameCallback) callback;
            } else if (callback instanceof PasswordCallback) {
                pc = (PasswordCallback) callback;
            } else if (callback instanceof RealmCallback) {
                rc = (RealmCallback) callback;
            } else {
                throw new UnsupportedCallbackException(callback, "Unrecognized SASL client callback");
            }
        }
        if (nc != null) {
            log.debug("SASL client callback: setting username: {}", userName);
            nc.setName(userName);
        }
        if (pc != null) {
            log.debug("SASL client callback: setting userPassword");
            pc.setPassword(userPassword);
        }
        if (rc != null) {
            log.debug("SASL client callback: setting realm: {}", rc.getDefaultText());
            rc.setText(rc.getDefaultText());
        }
    }

    @Override
    public String toString() {
        return NAME;
    }

    @Override
    public int hashCode() {
        HashCodeBuilder hcb = new HashCodeBuilder(41, 47);
        hcb.append(userName).append(userPassword);
        return hcb.toHashCode();
    }

    @Override
    public boolean equals(Object o) {
        if (null == o) {
            return false;
        }
        if (o instanceof SaslClientDigestCallbackHandler) {
            SaslClientDigestCallbackHandler other = (SaslClientDigestCallbackHandler) o;
            return userName.equals(other.userName) && Arrays.equals(userPassword, other.userPassword);
        }
        return false;
    }
}