Apache ZooKeeper Server Source Code

Apache ZooKeeper is an open-source server which enables highly reliable distributed coordination.

Apache ZooKeeper Server Source Code files are provided in the source packge (apache-zookeeper-3.7.0.tar.gz). You can download it at Apache ZooKeeper Website.

You can also browse Apache ZooKeeper Server Source Code below:

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 * 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
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package org.apache.zookeeper.server.auth;

import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.server.ServerCnxn;

public class SASLAuthenticationProvider implements AuthenticationProvider {

    public String getScheme() {
        return "sasl";

    public KeeperException.Code handleAuthentication(ServerCnxn cnxn, byte[] authData) {
        // Should never call this: SASL authentication is negotiated at session initiation.
        // TODO: consider substituting current implementation of direct ClientCnxn manipulation with
        // a call to this method (SASLAuthenticationProvider:handleAuthentication()) at session initiation.
        return KeeperException.Code.AUTHFAILED;


    public boolean matches(String id, String aclExpr) {
        if ((id.equals("super") || id.equals(aclExpr))) {
            return true;
        String readAccessUser = System.getProperty("zookeeper.letAnySaslUserDoX");
        return readAccessUser != null && aclExpr.equals(readAccessUser);

    public boolean isAuthenticated() {
        return true;

    public boolean isValid(String id) {
        // Since the SASL authenticator will usually be used with Kerberos authentication,
        // it should enforce that these names are valid according to Kerberos's
        // syntax for principals.
        // Use the KerberosName(id) constructor to define validity:
        // if KerberosName(id) throws IllegalArgumentException, then id is invalid.
        // otherwise, it is valid.
        try {
            new KerberosName(id);
            return true;
        } catch (IllegalArgumentException e) {
            return false;




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2018-10-18, 28966👍, 1💬