| /* |
| * Portions Copyright 2000-2006 Sun Microsystems, Inc. All Rights Reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Sun designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Sun in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| */ |
| |
| /* |
| * |
| * (C) Copyright IBM Corp. 1999 All Rights Reserved. |
| * Copyright 1997 The Open Group Research Institute. All rights reserved. |
| */ |
| |
| package sun.security.krb5; |
| |
| import sun.security.krb5.internal.Krb5; |
| import sun.security.krb5.internal.UDPClient; |
| import sun.security.krb5.internal.TCPClient; |
| import java.io.IOException; |
| import java.io.InterruptedIOException; |
| import java.net.SocketTimeoutException; |
| import java.net.UnknownHostException; |
| import java.util.StringTokenizer; |
| import java.security.AccessController; |
| import java.security.PrivilegedExceptionAction; |
| import java.security.PrivilegedActionException; |
| |
| public abstract class KrbKdcReq { |
| |
| /** |
| * Default port for a KDC. |
| */ |
| private static final int DEFAULT_KDC_PORT = Krb5.KDC_INET_DEFAULT_PORT; |
| |
| // Currently there is no option to specify retries |
| // in the kerberos configuration file |
| |
| private static final int DEFAULT_KDC_RETRY_LIMIT = Krb5.KDC_RETRY_LIMIT; |
| |
| /** |
| * Default timeout period when requesting a ticket from a KDC. |
| * If not specified in the configuration file, |
| * a value of 30 seconds is used. |
| */ |
| public static final int DEFAULT_KDC_TIMEOUT; // milliseconds |
| |
| private static final boolean DEBUG = Krb5.DEBUG; |
| |
| private static int udpPrefLimit = -1; |
| |
| static { |
| |
| /* |
| * Get default timeout. |
| */ |
| |
| int timeout = -1; |
| try { |
| Config cfg = Config.getInstance(); |
| String temp = cfg.getDefault("kdc_timeout", "libdefaults"); |
| timeout = parsePositiveIntString(temp); |
| temp = cfg.getDefault("udp_preference_limit", "libdefaults"); |
| udpPrefLimit = parsePositiveIntString(temp); |
| } catch (Exception exc) { |
| // ignore any exceptions; use the default time out values |
| if (DEBUG) { |
| System.out.println ("Exception in getting kdc_timeout value, " + |
| "using default value " + |
| exc.getMessage()); |
| } |
| } |
| |
| if (timeout > 0) |
| DEFAULT_KDC_TIMEOUT = timeout; |
| else |
| DEFAULT_KDC_TIMEOUT = 30*1000; // 30 seconds |
| } |
| |
| protected byte[] obuf; |
| protected byte[] ibuf; |
| |
| /** |
| * Sends the provided data to the KDC of the specified realm. |
| * Returns the response from the KDC. |
| * Default realm/KDC is used if realm is null. |
| * @param realm the realm of the KDC where data is to be sent. |
| * @returns the kdc to which the AS request was sent to |
| * @exception InterruptedIOException if timeout expires |
| * @exception KrbException |
| */ |
| |
| public String send(String realm) |
| throws IOException, KrbException { |
| boolean useTCP = (udpPrefLimit > 0 && |
| (obuf != null && obuf.length > udpPrefLimit)); |
| |
| return (send(realm, useTCP)); |
| } |
| |
| public String send(String realm, boolean useTCP) |
| throws IOException, KrbException { |
| |
| if (obuf == null) |
| return null; |
| Exception savedException = null; |
| Config cfg = Config.getInstance(); |
| |
| if (realm == null) { |
| realm = cfg.getDefaultRealm(); |
| if (realm == null) { |
| throw new KrbException(Krb5.KRB_ERR_GENERIC, |
| "Cannot find default realm"); |
| } |
| } |
| |
| /* |
| * Get timeout. |
| */ |
| |
| int timeout = getKdcTimeout(realm); |
| |
| String kdcList = cfg.getKDCList(realm); |
| if (kdcList == null) { |
| throw new KrbException("Cannot get kdc for realm " + realm); |
| } |
| String tempKdc = null; // may include the port number also |
| StringTokenizer st = new StringTokenizer(kdcList); |
| while (st.hasMoreTokens()) { |
| tempKdc = st.nextToken(); |
| try { |
| send(realm,tempKdc,useTCP); |
| break; |
| } catch (Exception e) { |
| savedException = e; |
| } |
| } |
| if (ibuf == null && savedException != null) { |
| if (savedException instanceof IOException) { |
| throw (IOException) savedException; |
| } else { |
| throw (KrbException) savedException; |
| } |
| } |
| return tempKdc; |
| } |
| |
| // send the AS Request to the specified KDC |
| |
| public void send(String realm, String tempKdc, boolean useTCP) |
| throws IOException, KrbException { |
| |
| if (obuf == null) |
| return; |
| PrivilegedActionException savedException = null; |
| int port = Krb5.KDC_INET_DEFAULT_PORT; |
| |
| /* |
| * Get timeout. |
| */ |
| int timeout = getKdcTimeout(realm); |
| /* |
| * Get port number for this KDC. |
| */ |
| StringTokenizer strTok = new StringTokenizer(tempKdc, ":"); |
| String kdc = strTok.nextToken(); |
| if (strTok.hasMoreTokens()) { |
| String portStr = strTok.nextToken(); |
| int tempPort = parsePositiveIntString(portStr); |
| if (tempPort > 0) |
| port = tempPort; |
| } |
| |
| if (DEBUG) { |
| System.out.println(">>> KrbKdcReq send: kdc=" + kdc |
| + (useTCP ? " TCP:":" UDP:") |
| + port + ", timeout=" |
| + timeout |
| + ", number of retries =" |
| + DEFAULT_KDC_RETRY_LIMIT |
| + ", #bytes=" + obuf.length); |
| } |
| |
| KdcCommunication kdcCommunication = |
| new KdcCommunication(kdc, port, useTCP, timeout, obuf); |
| try { |
| ibuf = AccessController.doPrivileged(kdcCommunication); |
| if (DEBUG) { |
| System.out.println(">>> KrbKdcReq send: #bytes read=" |
| + (ibuf != null ? ibuf.length : 0)); |
| } |
| } catch (PrivilegedActionException e) { |
| Exception wrappedException = e.getException(); |
| if (wrappedException instanceof IOException) { |
| throw (IOException) wrappedException; |
| } else { |
| throw (KrbException) wrappedException; |
| } |
| } |
| if (DEBUG) { |
| System.out.println(">>> KrbKdcReq send: #bytes read=" |
| + (ibuf != null ? ibuf.length : 0)); |
| } |
| } |
| |
| private static class KdcCommunication |
| implements PrivilegedExceptionAction<byte[]> { |
| |
| private String kdc; |
| private int port; |
| private boolean useTCP; |
| private int timeout; |
| private byte[] obuf; |
| |
| public KdcCommunication(String kdc, int port, boolean useTCP, |
| int timeout, byte[] obuf) { |
| this.kdc = kdc; |
| this.port = port; |
| this.useTCP = useTCP; |
| this.timeout = timeout; |
| this.obuf = obuf; |
| } |
| |
| // The caller only casts IOException and KrbException so don't |
| // add any new ones! |
| |
| public byte[] run() throws IOException, KrbException { |
| |
| byte[] ibuf = null; |
| |
| if (useTCP) { |
| TCPClient kdcClient = new TCPClient(kdc, port); |
| try { |
| /* |
| * Send the data to the kdc. |
| */ |
| kdcClient.send(obuf); |
| /* |
| * And get a response. |
| */ |
| ibuf = kdcClient.receive(); |
| } finally { |
| kdcClient.close(); |
| } |
| |
| } else { |
| // For each KDC we try DEFAULT_KDC_RETRY_LIMIT (3) times to |
| // get the response |
| for (int i=1; i <= DEFAULT_KDC_RETRY_LIMIT; i++) { |
| UDPClient kdcClient = new UDPClient(kdc, port, timeout); |
| |
| if (DEBUG) { |
| System.out.println(">>> KDCCommunication: kdc=" + kdc |
| + (useTCP ? " TCP:":" UDP:") |
| + port + ", timeout=" |
| + timeout |
| + ",Attempt =" + i |
| + ", #bytes=" + obuf.length); |
| } |
| try { |
| /* |
| * Send the data to the kdc. |
| */ |
| |
| kdcClient.send(obuf); |
| |
| /* |
| * And get a response. |
| */ |
| try { |
| ibuf = kdcClient.receive(); |
| break; |
| } catch (SocketTimeoutException se) { |
| if (DEBUG) { |
| System.out.println ("SocketTimeOutException with " + |
| "attempt: " + i); |
| } |
| if (i == DEFAULT_KDC_RETRY_LIMIT) { |
| ibuf = null; |
| throw se; |
| } |
| } |
| } finally { |
| kdcClient.close(); |
| } |
| } |
| } |
| return ibuf; |
| } |
| } |
| |
| /** |
| * Returns a timeout value for the KDC of the given realm. |
| * A KDC-specific timeout, if specified in the config file, |
| * overrides the default timeout (which may also be specified |
| * in the config file). Default timeout is returned if null |
| * is specified for realm. |
| * @param realm the realm which kdc's timeout is requested |
| * @return KDC timeout |
| */ |
| private int getKdcTimeout(String realm) |
| { |
| int timeout = DEFAULT_KDC_TIMEOUT; |
| |
| if (realm == null) |
| return timeout; |
| |
| int tempTimeout = -1; |
| try { |
| String temp = |
| Config.getInstance().getDefault("kdc_timeout", realm); |
| tempTimeout = parsePositiveIntString(temp); |
| } catch (Exception exc) { |
| } |
| |
| if (tempTimeout > 0) |
| timeout = tempTimeout; |
| |
| return timeout; |
| } |
| |
| 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; |
| } |
| } |