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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.hive.service.auth.ldap;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import org.apache.commons.lang3.StringUtils;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hive.service.ServiceUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Static utility methods related to LDAP authentication module.
*/
public final class LdapUtils {
private static final Logger LOG = LoggerFactory.getLogger(LdapUtils.class);
/**
* Extracts a base DN from the provided distinguished name.
*
* Example:
*
* "ou=CORP,dc=mycompany,dc=com" is the base DN for "cn=user1,ou=CORP,dc=mycompany,dc=com"
*
* @param dn distinguished name
* @return base DN
*/
public static String extractBaseDn(String dn) {
final int indexOfFirstDelimiter = dn.indexOf(",");
if (indexOfFirstDelimiter > -1) {
return dn.substring(indexOfFirstDelimiter + 1);
}
return null;
}
/**
* Extracts the first Relative Distinguished Name (RDN).
*
* Example:
*
* For DN "cn=user1,ou=CORP,dc=mycompany,dc=com" this method will return "cn=user1"
* @param dn distinguished name
* @return first RDN
*/
public static String extractFirstRdn(String dn) {
return dn.substring(0, dn.indexOf(","));
}
/**
* Extracts username from user DN.
*
* Examples:
*
* @param userDn
* @return
*/
public static String extractUserName(String userDn) {
if (!isDn(userDn) && !hasDomain(userDn)) {
return userDn;
}
int domainIdx = ServiceUtils.indexOfDomainMatch(userDn);
if (domainIdx > 0) {
return userDn.substring(0, domainIdx);
}
if (userDn.contains("=")) {
return userDn.substring(userDn.indexOf("=") + 1, userDn.indexOf(","));
}
return userDn;
}
/**
* Gets value part of the first attribute in the provided RDN.
*
* Example:
*
* For RDN "cn=user1,ou=CORP" this method will return "user1"
* @param rdn Relative Distinguished Name
* @return value part of the first attribute
*/
public static String getShortName(String rdn) {
return ((rdn.split(","))[0].split("="))[1];
}
/**
* Check for a domain part in the provided username.
*
* Example:
*
*
* @param name name to be checked
* @return true if the provided name is a distinguished name
*/
public static boolean isDn(String name) {
return name.contains("=");
}
/**
* Reads and parses DN patterns from Hive configuration.
*
* If no patterns are provided in the configuration, then the base DN will be used.
* @param conf Hive configuration
* @param var variable to be read
* @return a list of DN patterns
* @see HiveConf.ConfVars#HIVE_SERVER2_PLAIN_LDAP_BASEDN
* @see HiveConf.ConfVars#HIVE_SERVER2_PLAIN_LDAP_GUIDKEY
* @see HiveConf.ConfVars#HIVE_SERVER2_PLAIN_LDAP_GROUPDNPATTERN
* @see HiveConf.ConfVars#HIVE_SERVER2_PLAIN_LDAP_USERDNPATTERN
*/
public static List parseDnPatterns(HiveConf conf, HiveConf.ConfVars var) {
String patternsString = conf.getVar(var);
List result = new ArrayList<>();
if (StringUtils.isBlank(patternsString)) {
String defaultBaseDn = conf.getVar(HiveConf.ConfVars.HIVE_SERVER2_PLAIN_LDAP_BASEDN);
String guidAttr = conf.getVar(HiveConf.ConfVars.HIVE_SERVER2_PLAIN_LDAP_GUIDKEY);
if (StringUtils.isNotBlank(defaultBaseDn)) {
result.add(guidAttr + "=%s," + defaultBaseDn);
}
} else {
String[] patterns = patternsString.split(":");
for (String pattern : patterns) {
if (pattern.contains(",") && pattern.contains("=")) {
result.add(pattern);
} else {
LOG.warn("Unexpected format for " + var + "..ignoring " + pattern);
}
}
}
return result;
}
private static String patternToBaseDn(String pattern) {
if (pattern.contains("=%s")) {
return pattern.split(",", 2)[1];
}
return pattern;
}
/**
* Converts a collection of Distinguished Name patterns to a collection of base DNs.
* @param patterns Distinguished Name patterns
* @return a list of base DNs
* @see HiveConf.ConfVars#HIVE_SERVER2_PLAIN_LDAP_GROUPDNPATTERN
* @see HiveConf.ConfVars#HIVE_SERVER2_PLAIN_LDAP_USERDNPATTERN
*/
public static List patternsToBaseDns(Collection patterns) {
List result = new ArrayList<>();
for (String pattern : patterns) {
result.add(patternToBaseDn(pattern));
}
return result;
}
/**
* Creates a list of principals to be used for user authentication.
* @param conf Hive configuration
* @param user username
* @return a list of user's principals
*/
public static List createCandidatePrincipals(HiveConf conf, String user) {
if (hasDomain(user) || isDn(user)) {
return Collections.singletonList(user);
}
String ldapDomain = conf.getVar(HiveConf.ConfVars.HIVE_SERVER2_PLAIN_LDAP_DOMAIN);
if (StringUtils.isNotBlank(ldapDomain)) {
return Collections.singletonList(user + "@" + ldapDomain);
}
List userPatterns = parseDnPatterns(conf,
HiveConf.ConfVars.HIVE_SERVER2_PLAIN_LDAP_USERDNPATTERN);
if (userPatterns.isEmpty()) {
return Collections.singletonList(user);
}
List candidatePrincipals = new ArrayList<>();
for (String userPattern : userPatterns) {
candidatePrincipals.add(userPattern.replaceAll("%s", user));
}
return candidatePrincipals;
}
private LdapUtils() {
}
}
