bitblender commented on a change in pull request #1467: DRILL-5671: Set secure ACLs (Access Control List) for Drill ZK nodes in a secure cluster URL: https://github.com/apache/drill/pull/1467#discussion_r230403657
########## File path: exec/java-exec/src/main/java/org/apache/drill/exec/coord/zk/ZKACLProviderFactory.java ########## @@ -0,0 +1,113 @@ +/* + * 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.drill.exec.coord.zk; + +import org.apache.drill.common.config.DrillConfig; +import static org.apache.drill.exec.ExecConstants.ZK_ACL_PROVIDER; +import static org.apache.drill.exec.ExecConstants.ZK_APPLY_SECURE_ACL; + +import org.apache.drill.common.scanner.persistence.ScanResult; +import org.apache.drill.exec.exception.DrillbitStartupException; +import org.apache.drill.exec.server.BootStrapContext; +import org.apache.drill.shaded.guava.com.google.common.base.Strings; +import java.lang.reflect.InvocationTargetException; + +import java.lang.reflect.Constructor; +import java.util.Collection; + +/** + * This function returns a {@link ZKACLProviderDelegate} which will be used to set ACLs on Drill ZK nodes + * If secure ACLs are required, the {@link ZKACLProviderFactory} looks up and instantiates a {@link ZKACLProviderDelegate} + * specified in the config file. Else it returns the {@link ZKDefaultACLProvider} + */ +public class ZKACLProviderFactory { + + static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(ZKACLProviderFactory.class); + + public static ZKACLProviderDelegate getACLProvider(DrillConfig config, String drillClusterPath, BootStrapContext context) + throws DrillbitStartupException { + ZKACLContextProvider stateProvider = new ZKACLContextProviderImpl(drillClusterPath); + + if (config.getBoolean(ZK_APPLY_SECURE_ACL)) { + logger.trace("Using secure ZK ACL. Drill cluster path " + drillClusterPath); + ZKACLProviderDelegate aclProvider = findACLProvider(config, stateProvider, context); + return aclProvider; + } + logger.trace("Using un-secure default ZK ACL"); + final ZKDefaultACLProvider defaultAclProvider = new ZKDefaultACLProvider(stateProvider); + return new ZKACLProviderDelegate(defaultAclProvider); + } + + public static ZKACLProviderDelegate findACLProvider(DrillConfig config, ZKACLContextProvider contextProvider, + BootStrapContext context) throws DrillbitStartupException { + if (!config.hasPath(ZK_ACL_PROVIDER)) { + throw new DrillbitStartupException(String.format("BOOT option '%s' is missing in config.", ZK_ACL_PROVIDER)); + } + + final String aclProviderName = config.getString(ZK_ACL_PROVIDER); + + if (Strings.isNullOrEmpty(aclProviderName)) { + throw new DrillbitStartupException(String.format("Invalid value '%s' for BOOT option '%s'", aclProviderName, + ZK_ACL_PROVIDER)); + } + + ScanResult scan = context.getClasspathScan(); + final Collection<Class<? extends ZKACLProvider>> aclProviderImpls = + scan.getImplementations(ZKACLProvider.class); + logger.debug("Found ZkACLProvider implementations: {}", aclProviderImpls); + + for (Class<? extends ZKACLProvider> clazz : aclProviderImpls) { + final ZKACLProviderTemplate template = clazz.getAnnotation(ZKACLProviderTemplate.class); + if (template == null) { + logger.warn("{} doesn't have {} annotation. Skipping.", clazz.getCanonicalName(), + ZKACLProviderTemplate.class); + continue; + } + + if (template.type().equalsIgnoreCase(aclProviderName)) { + Constructor<?> validConstructor = null; + Class constructorArgumentClass = ZKACLContextProvider.class; + for (Constructor<?> c : clazz.getConstructors()) { + Class<?>[] params = c.getParameterTypes(); + if (params.length == 1 && params[0] == constructorArgumentClass) { + validConstructor = c; + break; + } + } + if (validConstructor == null) { + logger.warn("Skipping ZKACLProvider implementation class '{}' since it doesn't " + + "implement a constructor [{}({})]", clazz.getCanonicalName(), clazz.getName(), + constructorArgumentClass.getName()); + continue; + } + try { + final ZKACLProvider aclProvider = (ZKACLProvider) validConstructor.newInstance(contextProvider); + return new ZKACLProviderDelegate(aclProvider); + } catch (InvocationTargetException | IllegalArgumentException | IllegalAccessException | InstantiationException e ) { Review comment: Thanks for pointing this out ! 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