| /* |
| * 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 |
| * questions. |
| */ |
| |
| /* |
| * |
| * (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); |
| } |
| |
| // This constructor is used in the native code |
| // src/windows/native/sun/security/krb5/NativeCreds.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(); |
| if (explicitTag != (der.getTag() & (byte)0x1F)) { |
| throw new Asn1Exception(Krb5.ASN1_BAD_ID); |
| } |
| else { |
| DerValue subDer = der.getData().getDerValue(); |
| Date temp = subDer.getGeneralizedTime(); |
| return new KerberosTime(temp.getTime(), 0); |
| } |
| } |
| |
| public static int getDefaultSkew() { |
| int tdiff = Krb5.DEFAULT_ALLOWABLE_CLOCKSKEW; |
| try { |
| if ((tdiff = Config.getInstance().getIntValue( |
| "libdefaults", "clockskew")) |
| == Integer.MIN_VALUE) { //value is not defined |
| tdiff = Krb5.DEFAULT_ALLOWABLE_CLOCKSKEW; |
| } |
| } catch (KrbException e) { |
| if (DEBUG) { |
| System.out.println("Exception in getting clockskew from " + |
| "Configuration " + |
| "using default value " + |
| e.getMessage()); |
| } |
| } |
| return tdiff; |
| } |
| |
| public String toString() { |
| return toGeneralizedTimeString(); |
| } |
| } |