/*
* Copyright (c) 2013, Oracle and/or its affiliates. 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. 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.rcache;
import java.io.IOException;
import java.nio.BufferUnderflowException;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.channels.SeekableByteChannel;
import java.nio.charset.StandardCharsets;
import java.util.StringTokenizer;
/**
* The class represents an old style replay cache entry. It is only used in
* a dfl file.
*
* @author Sun/Oracle
* @author Yanni Zhang
*/
public class AuthTime {
final int ctime;
final int cusec;
final String client;
final String server;
/**
* Constructs an <code>AuthTime</code>.
*/
public AuthTime(String client, String server,
int ctime, int cusec) {
this.ctime = ctime;
this.cusec = cusec;
this.client = client;
this.server = server;
}
@Override
public String toString() {
return String.format("%d/%06d/----/%s", ctime, cusec, client);
}
// Methods used when saved in a dfl file. See DflCache.java
/**
* Reads an LC style string from a channel, which is a int32 length
* plus a UTF-8 encoded string possibly ends with \0.
* @throws IOException if there is a format error
* @throws BufferUnderflowException if goes beyond the end
*/
private static String readStringWithLength(SeekableByteChannel chan)
throws IOException {
ByteBuffer bb = ByteBuffer.allocate(4);
bb.order(ByteOrder.nativeOrder());
chan.read(bb);
bb.flip();
int len = bb.getInt();
if (len > 1024) {
// Memory attack? The string should be fairly short.
throw new IOException("Invalid string length");
}
bb = ByteBuffer.allocate(len);
if (chan.read(bb) != len) {
throw new IOException("Not enough string");
}
byte[] data = bb.array();
return (data[len-1] == 0)?
new String(data, 0, len-1, StandardCharsets.UTF_8):
new String(data, StandardCharsets.UTF_8);
}
/**
* Reads an AuthTime or AuthTimeWithHash object from a channel.
* @throws IOException if there is a format error
* @throws BufferUnderflowException if goes beyond the end
*/
public static AuthTime readFrom(SeekableByteChannel chan)
throws IOException {
String client = readStringWithLength(chan);
String server = readStringWithLength(chan);
ByteBuffer bb = ByteBuffer.allocate(8);
chan.read(bb);
bb.order(ByteOrder.nativeOrder());
int cusec = bb.getInt(0);
int ctime = bb.getInt(4);
if (client.isEmpty()) {
StringTokenizer st = new StringTokenizer(server, " :");
if (st.countTokens() != 6) {
throw new IOException("Incorrect rcache style");
}
st.nextToken();
String hash = st.nextToken();
st.nextToken();
client = st.nextToken();
st.nextToken();
server = st.nextToken();
return new AuthTimeWithHash(
client, server, ctime, cusec, hash);
} else {
return new AuthTime(
client, server, ctime, cusec);
}
}
/**
* Encodes to be used in a dfl file
*/
protected byte[] encode0(String cstring, String sstring) {
byte[] c = cstring.getBytes(StandardCharsets.UTF_8);;
byte[] s = sstring.getBytes(StandardCharsets.UTF_8);;
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