| /** |
| * 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.kerby.kerberos.kerb.client; |
| |
| import org.apache.kerby.kerberos.kerb.KrbException; |
| import org.apache.kerby.kerberos.kerb.transport.TransportPair; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.net.InetSocketAddress; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Map; |
| |
| public final class ClientUtil { |
| private ClientUtil() { } |
| |
| private static final Logger LOG = LoggerFactory.getLogger(ClientUtil.class); |
| private static final String KRB5_FILE_NAME = "krb5.conf"; |
| private static final String KRB5_ENV_NAME = "KRB5_CONFIG"; |
| |
| /** |
| * Load krb5.conf from specified conf dir. |
| * @param conf The conf file or dir, default file name 'krb5.conf' is used if dir |
| * @return KrbConfig |
| * @throws KrbException e |
| */ |
| public static KrbConfig getConfig(File conf) throws KrbException { |
| if (conf == null || !conf.exists()) { |
| throw new KrbException(conf + " not found"); |
| } |
| File confFile = conf.isDirectory() ? new File(conf, KRB5_FILE_NAME) : conf; |
| if (!confFile.exists()) { |
| throw new KrbException(KRB5_FILE_NAME + " not found"); |
| } |
| |
| if (confFile != null && confFile.exists()) { |
| KrbConfig krbConfig = new KrbConfig(); |
| try { |
| krbConfig.addKrb5Config(confFile); |
| return krbConfig; |
| } catch (IOException e) { |
| throw new KrbException("Failed to load krb config " |
| + confFile.getAbsolutePath()); |
| } |
| } |
| |
| return null; |
| } |
| |
| /** |
| * Load default krb5.conf |
| * @return The KrbConfig |
| * @throws KrbException e |
| */ |
| public static KrbConfig getDefaultConfig() throws KrbException { |
| File confFile = null; |
| File confDir; |
| String tmpEnv; |
| |
| try { |
| Map<String, String> mapEnv = System.getenv(); |
| tmpEnv = mapEnv.get(KRB5_ENV_NAME); |
| } catch (SecurityException e) { |
| tmpEnv = null; |
| } |
| if (tmpEnv != null) { |
| confFile = new File(tmpEnv); |
| if (!confFile.exists()) { |
| throw new KrbException("krb5 conf not found. Invalid env " |
| + KRB5_ENV_NAME); |
| } |
| } else { |
| confDir = new File("/etc/"); // for Linux. TODO: fix for Win etc. |
| if (confDir.exists()) { |
| confFile = new File(confDir, "krb5.conf"); |
| } |
| } |
| |
| KrbConfig krbConfig = new KrbConfig(); |
| if (confFile != null && confFile.exists()) { |
| try { |
| krbConfig.addKrb5Config(confFile); |
| } catch (IOException e) { |
| throw new KrbException("Failed to load krb config " |
| + confFile.getAbsolutePath()); |
| } |
| } |
| |
| return krbConfig; |
| } |
| |
| /** |
| * Get KDC network transport addresses according to krb client setting. |
| * @param setting The krb setting |
| * @param kdcString The kdc string, may include the port number |
| * @return UDP and TCP addresses pair |
| * @throws KrbException e |
| */ |
| public static TransportPair getTransportPair( |
| KrbSetting setting, String kdcString) throws KrbException, IOException { |
| TransportPair result = new TransportPair(); |
| int tcpPort = setting.checkGetKdcTcpPort(); |
| int udpPort = setting.checkGetKdcUdpPort(); |
| |
| int port = 0; |
| String kdc; |
| String portStr = null; |
| |
| // Explicit IPv6 in [] |
| if (kdcString.charAt(0) == '[') { |
| int pos = kdcString.indexOf(']', 1); |
| if (pos == -1) { |
| throw new IOException("Illegal KDC: " + kdcString); |
| } |
| kdc = kdcString.substring(1, pos); |
| // with port number |
| if (pos != kdcString.length() - 1) { |
| if (kdcString.charAt(pos + 1) != ':') { |
| throw new IOException("Illegal KDC: " + kdcString); |
| } |
| portStr = kdcString.substring(pos + 2); |
| } |
| } else { |
| int colon = kdcString.indexOf(':'); |
| // Hostname or IPv4 host only |
| if (colon == -1) { |
| kdc = kdcString; |
| } else { |
| int nextColon = kdcString.indexOf(':', colon + 1); |
| // >=2 ":", IPv6 with no port |
| if (nextColon > 0) { |
| kdc = kdcString; |
| } else { |
| // 1 ":", hostname or IPv4 with port |
| kdc = kdcString.substring(0, colon); |
| portStr = kdcString.substring(colon + 1); |
| } |
| } |
| } |
| if (portStr != null) { |
| int tempPort = parsePositiveIntString(portStr); |
| if (tempPort > 0) { |
| port = tempPort; |
| } |
| } |
| if (port != 0) { |
| tcpPort = port; |
| udpPort = port; |
| } |
| if (tcpPort > 0) { |
| result.tcpAddress = new InetSocketAddress( |
| kdc, tcpPort); |
| } |
| if (udpPort > 0) { |
| result.udpAddress = new InetSocketAddress( |
| kdc, udpPort); |
| } |
| return result; |
| } |
| |
| private static int parsePositiveIntString(String intString) { |
| if (intString == null) { |
| return -1; |
| } |
| int ret = -1; |
| try { |
| ret = Integer.parseInt(intString); |
| } catch (Exception exc) { |
| return -1; |
| } |
| if (ret >= 0) { |
| return ret; |
| } |
| return -1; |
| } |
| |
| /** |
| * Returns a list of KDC |
| * |
| * @throws KrbException if there's no way to find KDC for the realm |
| * @return the list of KDC, always non null |
| */ |
| public static List<String> getKDCList(String realm, KrbSetting krbSetting) throws KrbException { |
| |
| List<String> kdcList = new ArrayList<>(); |
| if (realm != null) { |
| KrbConfig krbConfig = krbSetting.getKrbConfig(); |
| List<Object> kdcs = krbConfig.getRealmSectionItems(realm, "kdc"); |
| if (!kdcs.isEmpty()) { |
| for (Object object : kdcs) { |
| kdcList.add(object != null ? object.toString() : null); |
| } |
| } |
| |
| if (kdcList.isEmpty()) { |
| LOG.warn("Cannot get kdc for realm " + realm); |
| kdcList.add(krbSetting.getKdcHost()); |
| } |
| } else { |
| throw new KrbException("Can't get the realm"); |
| } |
| return kdcList; |
| } |
| } |