/*
* 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. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
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/*
*
* (C) Copyright IBM Corp. 1999 All Rights Reserved.
* Copyright 1997 The Open Group Research Institute. All rights reserved.
*/
package sun.security.krb5.internal;
import sun.security.krb5.Asn1Exception;
import sun.security.krb5.Config;
import sun.security.krb5.KrbException;
import sun.security.util.DerInputStream;
import sun.security.util.DerOutputStream;
import sun.security.util.DerValue;
import java.io.IOException;
import java.time.Instant;
import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;
/**
* Implements the ASN.1 KerberosTime type. This is an immutable class.
*
* {@code KerberosTime ::= GeneralizedTime} -- with no fractional seconds
*
* The timestamps used in Kerberos are encoded as GeneralizedTimes. A
* KerberosTime value shall not include any fractional portions of the
* seconds. As required by the DER, it further shall not include any
* separators, and it shall specify the UTC time zone (Z).
*
* <p>
* This definition reflects the Network Working Group RFC 4120
* specification available at
* <a href="http://www.ietf.org/rfc/rfc4120.txt">
* http://www.ietf.org/rfc/rfc4120.txt</a>.
*
* The implementation also includes the microseconds info so that the
* same class can be used as a precise timestamp in Authenticator etc.
*/
public class KerberosTime {
private final long kerberosTime; // milliseconds since epoch, Date.getTime()
private final int microSeconds; // last 3 digits of the real microsecond
// The time when this class is loaded. Used in setNow()
private static long initMilli = System.currentTimeMillis();
private static long initMicro = System.nanoTime() / 1000;
private static boolean DEBUG = Krb5.DEBUG;
// Do not make this public. It's a little confusing that micro
// is only the last 3 digits of microsecond.
private KerberosTime(long time, int micro) {
kerberosTime = time;
microSeconds = micro;
}
/**
* Creates a KerberosTime object from milliseconds since epoch.
*/
public KerberosTime(long time) {
this(time, 0);
}
// Warning: called by NativeCreds.c and nativeccache.c
public KerberosTime(String time) throws Asn1Exception {
this(toKerberosTime(time), 0);
}
private static long toKerberosTime(String time) throws Asn1Exception {
// ASN.1 GeneralizedTime format:
// "19700101000000Z"
// | | | | | | |
// 0 4 6 8 | | |
// 10 | |
// 12 |
// 14
if (time.length() != 15)
throw new Asn1Exception(Krb5.ASN1_BAD_TIMEFORMAT);
if (time.charAt(14) != 'Z')
throw new Asn1Exception(Krb5.ASN1_BAD_TIMEFORMAT);
int year = Integer.parseInt(time.substring(0, 4));
Calendar calendar = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
calendar.clear(); // so that millisecond is zero
calendar.set(year,
Integer.parseInt(time.substring(4, 6)) - 1,
Integer.parseInt(time.substring(6, 8)),
Integer.parseInt(time.substring(8, 10)),
Integer.parseInt(time.substring(10, 12)),
Integer.parseInt(time.substring(12, 14)));
return calendar.getTimeInMillis();
}
/**
* Creates a KerberosTime object from a Date object.
*/
public KerberosTime(Date time) {
this(time.getTime(), 0);
}
/**
* Creates a KerberosTime object from an Instant object
*/
public KerberosTime(Instant instant) {
this(instant.getEpochSecond()*1000 + instant.getNano()/1000000L,
instant.getNano()/1000%1000);
}
/**
* Creates a KerberosTime object for now. It uses System.nanoTime()
* to get a more precise time than "new Date()".
*/
public static KerberosTime now() {
long newMilli = System.currentTimeMillis();
long newMicro = System.nanoTime() / 1000;
long microElapsed = newMicro - initMicro;
long calcMilli = initMilli + microElapsed/1000;
if (calcMilli - newMilli > 100 || newMilli - calcMilli > 100) {
if (DEBUG) {
System.out.println("System time adjusted");
}
initMilli = newMilli;
initMicro = newMicro;
return new KerberosTime(newMilli, 0);
} else {
return new KerberosTime(calcMilli, (int)(microElapsed % 1000));
}
}
/**
* Returns a string representation of KerberosTime object.
* @return a string representation of this object.
*/
public String toGeneralizedTimeString() {
Calendar calendar = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
calendar.clear();
calendar.setTimeInMillis(kerberosTime);
return String.format("%04d%02d%02d%02d%02d%02dZ",
calendar.get(Calendar.YEAR),
calendar.get(Calendar.MONTH) + 1,
calendar.get(Calendar.DAY_OF_MONTH),
calendar.get(Calendar.HOUR_OF_DAY),
calendar.get(Calendar.MINUTE),
calendar.get(Calendar.SECOND));
}
/**
* Encodes this object to a byte array.
* @return a byte array of encoded data.
* @exception Asn1Exception if an error occurs while decoding an ASN1 encoded data.
* @exception IOException if an I/O error occurs while reading encoded data.
*/
public byte[] asn1Encode() throws Asn1Exception, IOException {
DerOutputStream out = new DerOutputStream();
out.putGeneralizedTime(this.toDate());
return out.toByteArray();
}
public long getTime() {
return kerberosTime;
}
public Date toDate() {
return new Date(kerberosTime);
}
public int getMicroSeconds() {
int temp_int = (int) ((kerberosTime % 1000L) * 1000L);
return temp_int + microSeconds;
}
/**
* Returns a new KerberosTime object with the original seconds
* and the given microseconds.
*/
public KerberosTime withMicroSeconds(int usec) {
return new KerberosTime(
kerberosTime - kerberosTime%1000L + usec/1000L,
usec%1000);
}
private boolean inClockSkew(int clockSkew) {
return java.lang.Math.abs(kerberosTime - System.currentTimeMillis())
<= clockSkew * 1000L;
}
public boolean inClockSkew() {
return inClockSkew(getDefaultSkew());
}
public boolean greaterThanWRTClockSkew(KerberosTime time, int clockSkew) {
if ((kerberosTime - time.kerberosTime) > clockSkew * 1000L)
return true;
return false;
}
public boolean greaterThanWRTClockSkew(KerberosTime time) {
return greaterThanWRTClockSkew(time, getDefaultSkew());
}
public boolean greaterThan(KerberosTime time) {
return kerberosTime > time.kerberosTime ||
kerberosTime == time.kerberosTime &&
microSeconds > time.microSeconds;
}
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (!(obj instanceof KerberosTime)) {
return false;
}
return kerberosTime == ((KerberosTime)obj).kerberosTime &&
microSeconds == ((KerberosTime)obj).microSeconds;
}
public int hashCode() {
int result = 37 * 17 + (int)(kerberosTime ^ (kerberosTime >>> 32));
return result * 17 + microSeconds;
}
public boolean isZero() {
return kerberosTime == 0 && microSeconds == 0;
}
public int getSeconds() {
return (int) (kerberosTime / 1000L);
}
/**
* Parse (unmarshal) a kerberostime from a DER input stream. This form
* parsing might be used when expanding a value which is part of
* a constructed sequence and uses explicitly tagged type.
*
* @exception Asn1Exception on error.
* @param data the Der input stream value, which contains
* one or more marshaled value.
* @param explicitTag tag number.
* @param optional indicates if this data field is optional
* @return an instance of KerberosTime.
*
*/
public static KerberosTime parse(
DerInputStream data, byte explicitTag, boolean optional)
throws Asn1Exception, IOException {
if ((optional) && (((byte)data.peekByte() & (byte)0x1F)!= explicitTag))
return null;
DerValue der = data.getDerValue();
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