author | weijun |
Wed, 17 Apr 2013 10:15:33 +0800 | |
changeset 16905 | 0419f45c7761 |
parent 14327 | c0d86f6f8be8 |
child 25186 | 63e1a2ec30f5 |
permissions | -rw-r--r-- |
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/* |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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/* |
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* |
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* (C) Copyright IBM Corp. 1999 All Rights Reserved. |
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* Copyright 1997 The Open Group Research Institute. All rights reserved. |
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*/ |
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package sun.security.krb5.internal; |
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import sun.security.krb5.Asn1Exception; |
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import sun.security.krb5.Config; |
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import sun.security.krb5.KrbException; |
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import sun.security.util.DerInputStream; |
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import sun.security.util.DerOutputStream; |
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import sun.security.util.DerValue; |
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import java.io.IOException; |
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import java.util.Calendar; |
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import java.util.Date; |
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import java.util.TimeZone; |
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/** |
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* Implements the ASN.1 KerberosTime type. This is an immutable class. |
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* |
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* <xmp> |
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* KerberosTime ::= GeneralizedTime -- with no fractional seconds |
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* </xmp> |
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* |
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* The timestamps used in Kerberos are encoded as GeneralizedTimes. A |
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* KerberosTime value shall not include any fractional portions of the |
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* seconds. As required by the DER, it further shall not include any |
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* separators, and it shall specify the UTC time zone (Z). |
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* |
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* <p> |
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* This definition reflects the Network Working Group RFC 4120 |
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* specification available at |
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* <a href="http://www.ietf.org/rfc/rfc4120.txt"> |
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* http://www.ietf.org/rfc/rfc4120.txt</a>. |
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* |
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* The implementation also includes the microseconds info so that the |
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* same class can be used as a precise timestamp in Authenticator etc. |
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*/ |
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public class KerberosTime { |
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private final long kerberosTime; // milliseconds since epoch, Date.getTime() |
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private final int microSeconds; // last 3 digits of the real microsecond |
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// The time when this class is loaded. Used in setNow() |
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d7f6c062c454
7077172: KerberosTime does not take into account system clock adjustement
weijun
parents:
7183
diff
changeset
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private static long initMilli = System.currentTimeMillis(); |
d7f6c062c454
7077172: KerberosTime does not take into account system clock adjustement
weijun
parents:
7183
diff
changeset
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private static long initMicro = System.nanoTime() / 1000; |
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private static boolean DEBUG = Krb5.DEBUG; |
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// Do not make this public. It's a little confusing that micro |
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// is only the last 3 digits of microsecond. |
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private KerberosTime(long time, int micro) { |
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kerberosTime = time; |
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microSeconds = micro; |
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} |
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/** |
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* Creates a KerberosTime object from milliseconds since epoch. |
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*/ |
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public KerberosTime(long time) { |
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this(time, 0); |
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} |
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// This constructor is used in the native code |
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// src/windows/native/sun/security/krb5/NativeCreds.c |
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public KerberosTime(String time) throws Asn1Exception { |
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this(toKerberosTime(time), 0); |
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} |
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private static long toKerberosTime(String time) throws Asn1Exception { |
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// ASN.1 GeneralizedTime format: |
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// "19700101000000Z" |
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// | | | | | | | |
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// 0 4 6 8 | | | |
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// 10 | | |
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// 12 | |
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// 14 |
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if (time.length() != 15) |
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throw new Asn1Exception(Krb5.ASN1_BAD_TIMEFORMAT); |
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if (time.charAt(14) != 'Z') |
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throw new Asn1Exception(Krb5.ASN1_BAD_TIMEFORMAT); |
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int year = Integer.parseInt(time.substring(0, 4)); |
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Calendar calendar = Calendar.getInstance(TimeZone.getTimeZone("UTC")); |
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calendar.clear(); // so that millisecond is zero |
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calendar.set(year, |
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Integer.parseInt(time.substring(4, 6)) - 1, |
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Integer.parseInt(time.substring(6, 8)), |
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Integer.parseInt(time.substring(8, 10)), |
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Integer.parseInt(time.substring(10, 12)), |
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Integer.parseInt(time.substring(12, 14))); |
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return calendar.getTimeInMillis(); |
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} |
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/** |
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* Creates a KerberosTime object from a Date object. |
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*/ |
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public KerberosTime(Date time) { |
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this(time.getTime(), 0); |
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} |
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/** |
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* Creates a KerberosTime object for now. It uses System.nanoTime() |
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* to get a more precise time than "new Date()". |
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*/ |
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public static KerberosTime now() { |
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long newMilli = System.currentTimeMillis(); |
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long newMicro = System.nanoTime() / 1000; |
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long microElapsed = newMicro - initMicro; |
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long calcMilli = initMilli + microElapsed/1000; |
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if (calcMilli - newMilli > 100 || newMilli - calcMilli > 100) { |
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if (DEBUG) { |
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System.out.println("System time adjusted"); |
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} |
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initMilli = newMilli; |
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initMicro = newMicro; |
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return new KerberosTime(newMilli, 0); |
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} else { |
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return new KerberosTime(calcMilli, (int)(microElapsed % 1000)); |
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} |
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} |
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/** |
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* Returns a string representation of KerberosTime object. |
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* @return a string representation of this object. |
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*/ |
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public String toGeneralizedTimeString() { |
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Calendar calendar = Calendar.getInstance(TimeZone.getTimeZone("UTC")); |
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calendar.clear(); |
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calendar.setTimeInMillis(kerberosTime); |
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return String.format("%04d%02d%02d%02d%02d%02dZ", |
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calendar.get(Calendar.YEAR), |
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calendar.get(Calendar.MONTH) + 1, |
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calendar.get(Calendar.DAY_OF_MONTH), |
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calendar.get(Calendar.HOUR_OF_DAY), |
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calendar.get(Calendar.MINUTE), |
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calendar.get(Calendar.SECOND)); |
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} |
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/** |
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* Encodes this object to a byte array. |
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* @return a byte array of encoded data. |
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* @exception Asn1Exception if an error occurs while decoding an ASN1 encoded data. |
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* @exception IOException if an I/O error occurs while reading encoded data. |
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*/ |
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public byte[] asn1Encode() throws Asn1Exception, IOException { |
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DerOutputStream out = new DerOutputStream(); |
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out.putGeneralizedTime(this.toDate()); |
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return out.toByteArray(); |
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} |
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public long getTime() { |
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return kerberosTime; |
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} |
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public Date toDate() { |
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return new Date(kerberosTime); |
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} |
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public int getMicroSeconds() { |
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Long temp_long = new Long((kerberosTime % 1000L) * 1000L); |
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return temp_long.intValue() + microSeconds; |
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} |
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/** |
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* Returns a new KerberosTime object with the original seconds |
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* and the given microseconds. |
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*/ |
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public KerberosTime withMicroSeconds(int usec) { |
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return new KerberosTime( |
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kerberosTime - kerberosTime%1000L + usec/1000L, |
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usec%1000); |
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} |
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private boolean inClockSkew(int clockSkew) { |
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return java.lang.Math.abs(kerberosTime - System.currentTimeMillis()) |
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<= clockSkew * 1000L; |
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} |
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public boolean inClockSkew() { |
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return inClockSkew(getDefaultSkew()); |
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} |
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public boolean greaterThanWRTClockSkew(KerberosTime time, int clockSkew) { |
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if ((kerberosTime - time.kerberosTime) > clockSkew * 1000L) |
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return true; |
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return false; |
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} |
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public boolean greaterThanWRTClockSkew(KerberosTime time) { |
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return greaterThanWRTClockSkew(time, getDefaultSkew()); |
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} |
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public boolean greaterThan(KerberosTime time) { |
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return kerberosTime > time.kerberosTime || |
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kerberosTime == time.kerberosTime && |
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microSeconds > time.microSeconds; |
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} |
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public boolean equals(Object obj) { |
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if (this == obj) { |
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return true; |
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} |
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if (!(obj instanceof KerberosTime)) { |
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return false; |
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} |
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return kerberosTime == ((KerberosTime)obj).kerberosTime && |
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microSeconds == ((KerberosTime)obj).microSeconds; |
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} |
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public int hashCode() { |
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int result = 37 * 17 + (int)(kerberosTime ^ (kerberosTime >>> 32)); |
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return result * 17 + microSeconds; |
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} |
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public boolean isZero() { |
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return kerberosTime == 0 && microSeconds == 0; |
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} |
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public int getSeconds() { |
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Long temp_long = new Long(kerberosTime / 1000L); |
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return temp_long.intValue(); |
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} |
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/** |
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* Parse (unmarshal) a kerberostime from a DER input stream. This form |
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* parsing might be used when expanding a value which is part of |
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* a constructed sequence and uses explicitly tagged type. |
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* |
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* @exception Asn1Exception on error. |
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* @param data the Der input stream value, which contains |
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* one or more marshaled value. |
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* @param explicitTag tag number. |
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* @param optional indicates if this data field is optional |
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* @return an instance of KerberosTime. |
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* |
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*/ |
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public static KerberosTime parse( |
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DerInputStream data, byte explicitTag, boolean optional) |
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throws Asn1Exception, IOException { |
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if ((optional) && (((byte)data.peekByte() & (byte)0x1F)!= explicitTag)) |
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return null; |
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DerValue der = data.getDerValue(); |
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if (explicitTag != (der.getTag() & (byte)0x1F)) { |
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throw new Asn1Exception(Krb5.ASN1_BAD_ID); |
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} |
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else { |
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DerValue subDer = der.getData().getDerValue(); |
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Date temp = subDer.getGeneralizedTime(); |
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return new KerberosTime(temp.getTime(), 0); |
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} |
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} |
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public static int getDefaultSkew() { |
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int tdiff = Krb5.DEFAULT_ALLOWABLE_CLOCKSKEW; |
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try { |
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if ((tdiff = Config.getInstance().getIntValue( |
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"libdefaults", "clockskew")) |
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== Integer.MIN_VALUE) { //value is not defined |
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tdiff = Krb5.DEFAULT_ALLOWABLE_CLOCKSKEW; |
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} |
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} catch (KrbException e) { |
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if (DEBUG) { |
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System.out.println("Exception in getting clockskew from " + |
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"Configuration " + |
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"using default value " + |
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e.getMessage()); |
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} |
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} |
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return tdiff; |
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} |
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public String toString() { |
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return toGeneralizedTimeString(); |
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} |
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} |