yiheng commented on a change in pull request #231: [LIVY-356][SERVER]Add LDAP authentication for livy-server. URL: https://github.com/apache/incubator-livy/pull/231#discussion_r328483779
########## File path: server/src/main/scala/org/apache/livy/server/auth/LdapAuthenticationHandlerImpl.scala ########## @@ -0,0 +1,231 @@ +/* + * 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.livy.server.auth + +import java.io.IOException +import java.nio.charset.StandardCharsets +import java.util +import java.util.Properties +import javax.naming.NamingException +import javax.naming.directory.InitialDirContext +import javax.naming.ldap.{Control, InitialLdapContext, StartTlsRequest, StartTlsResponse} +import javax.net.ssl.{HostnameVerifier, SSLSession} +import javax.servlet.ServletException +import javax.servlet.http.{HttpServletRequest, HttpServletResponse} + +import org.apache.commons.codec.binary.Base64 +import org.apache.hadoop.security.authentication.client.AuthenticationException +import org.apache.hadoop.security.authentication.server.{AuthenticationHandler, AuthenticationToken} + +import org.apache.livy._ + +object LdapAuthenticationHandlerImpl { + + val AUTHORIZATION_SCHEME = "Basic" + val TYPE = "ldap" + val SECURITY_AUTHENTICATION = "simple" + val PROVIDER_URL = "ldap.providerurl" + val BASE_DN = "ldap.basedn" + val LDAP_BIND_DOMAIN = "ldap.binddomain" + val ENABLE_START_TLS = "ldap.enablestarttls" + + private def hasDomain(userName: String): Boolean = { + indexOfDomainMatch(userName) > 0 + } + + /** + * Get the index separating the user name from domain name (the user's name up + * to the first '/' or '@'). + * + * @param userName full user name. + * @return index of domain match or -1 if not found + */ + + private def indexOfDomainMatch(userName: String): Integer = { + if (userName == null) { + -1 + } else { + val idx = userName.indexOf('/') + val idx2 = userName.indexOf('@') + // Use the earlier match. + var endIdx = Math.min(idx, idx2) + + // Unless at least one of '/' or '@' was not found, in + // which case, user the latter match. + if (endIdx == -1) endIdx = Math.max(idx, idx2) + endIdx + } + } +} + +class LdapAuthenticationHandlerImpl extends AuthenticationHandler with Logging { + private var ldapDomain = "null" + private var baseDN = "null" + private var providerUrl = "null" + private var enableStartTls = false + private var disableHostNameVerification = false + + def getType: String = LdapAuthenticationHandlerImpl.TYPE + + @throws[ServletException] + def init(config: Properties): Unit = { + this.baseDN = config.getProperty(LdapAuthenticationHandlerImpl.BASE_DN) + this.providerUrl = config.getProperty(LdapAuthenticationHandlerImpl.PROVIDER_URL) + this.ldapDomain = config.getProperty(LdapAuthenticationHandlerImpl.LDAP_BIND_DOMAIN) + this.enableStartTls = config.getProperty(LdapAuthenticationHandlerImpl.ENABLE_START_TLS, + "false").toBoolean + require(this.providerUrl != null, "The LDAP URI can not be null") + + if (this.enableStartTls.booleanValue) { + val tmp = this.providerUrl.toLowerCase + require(!tmp.startsWith("ldaps"), "Can not use ldaps and StartTLS option at the same time") + } + } + + def destroy(): Unit = { + } + + @throws[IOException] + @throws[AuthenticationException] + def managementOperation(token: AuthenticationToken, request: HttpServletRequest, + response: HttpServletResponse) : Boolean = true + + @throws[IOException] + @throws[AuthenticationException] + def authenticate(request: HttpServletRequest, + response: HttpServletResponse): AuthenticationToken = { + var token: AuthenticationToken = null + var authorization = request.getHeader("Authorization") + + if (authorization != null && authorization.regionMatches(true, 0, + LdapAuthenticationHandlerImpl.AUTHORIZATION_SCHEME, 0, + LdapAuthenticationHandlerImpl.AUTHORIZATION_SCHEME.length)) { + authorization = authorization.substring("Basic".length).trim + val base64 = new Base64(0) + val credentials = new String(base64.decode(authorization), + StandardCharsets.UTF_8).split(":", 2) + + if (credentials.length == 2) { + debug(s"Authenticating [${credentials(0)}] user") + token = this.authenticateUser(credentials(0), credentials(1)) + response.setStatus(HttpServletResponse.SC_OK) + } + } else { + response.setHeader("WWW-Authenticate", "Basic") + response.setStatus(HttpServletResponse.SC_UNAUTHORIZED) + + if (authorization == null) { + trace("Basic auth starting") + } else { + warn("\'Authorization\' does not start " + s"with \'Basic\' : ${authorization} ") + } + } + token + } + + @throws[AuthenticationException] + private def authenticateUser(userName: String, password: String): AuthenticationToken = { + if (userName != null && !userName.isEmpty) { + var principle: String = userName + + if (!LdapAuthenticationHandlerImpl.hasDomain(userName) && + this.ldapDomain != null) { Review comment: remove the `this` and put the condition in the same line? 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