| /* |
| * Copyright (c) 2000, 2010, 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 |
| * questions. |
| */ |
| |
| /* |
| * |
| * (C) Copyright IBM Corp. 1999 All Rights Reserved. |
| * Copyright 1997 The Open Group Research Institute. All rights reserved. |
| */ |
| |
| package sun.security.krb5.internal.ktab; |
| |
| import sun.security.krb5.internal.*; |
| import sun.security.krb5.PrincipalName; |
| import sun.security.krb5.Realm; |
| import sun.security.krb5.RealmException; |
| import sun.security.krb5.internal.util.KrbDataInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| /** |
| * This class implements a buffered input stream. It is used for parsing key table |
| * data to memory. |
| * |
| * @author Yanni Zhang |
| * |
| */ |
| public class KeyTabInputStream extends KrbDataInputStream implements KeyTabConstants { |
| |
| boolean DEBUG = Krb5.DEBUG; |
| int index; |
| |
| public KeyTabInputStream(InputStream is) { |
| super(is); |
| } |
| /** |
| * Reads the number of bytes this entry data occupy. |
| */ |
| int readEntryLength() throws IOException { |
| return read(4); |
| } |
| |
| |
| KeyTabEntry readEntry(int entryLen, int ktVersion) throws IOException, RealmException { |
| index = entryLen; |
| if (index == 0) { //in native implementation, when the last entry is deleted, a byte 0 is left. |
| return null; |
| } |
| if (index < 0) { //in native implementation, when one of the entries is deleted, the entry length turns to be negative, and |
| skip(Math.abs(index)); //the fields are left with 0 bytes |
| return null; |
| } |
| int principalNum = read(2); //the number of service names. |
| index -= 2; |
| if (ktVersion == KRB5_KT_VNO_1) { //V1 includes realm in the count. |
| principalNum -= 1; |
| } |
| Realm realm = new Realm(readName()); |
| String[] nameParts = new String[principalNum]; |
| for (int i = 0; i < principalNum; i++) { |
| nameParts[i] = readName(); |
| } |
| int nameType = read(4); |
| index -= 4; |
| PrincipalName service = new PrincipalName(nameParts, nameType); |
| service.setRealm(realm); |
| KerberosTime timeStamp = readTimeStamp(); |
| |
| int keyVersion = read() & 0xff; |
| index -= 1; |
| int keyType = read(2); |
| index -= 2; |
| int keyLength = read(2); |
| index -= 2; |
| byte[] keyblock = readKey(keyLength); |
| index -= keyLength; |
| // There might be a 32 bit kvno here. |
| // If index is zero, assume that the 8 bit key version number was |
| // right, otherwise trust the new nonzero value. |
| if (index >= 4) { |
| int extKvno = read(4); |
| if (extKvno != 0) { |
| keyVersion = extKvno; |
| } |
| index -= 4; |
| } |
| |
| // if index is negative, the keytab format must be wrong. |
| if (index < 0) { |
| throw new RealmException("Keytab is corrupted"); |
| } |
| |
| // ignore the left bytes. |
| skip(index); |
| |
| return new KeyTabEntry(service, realm, timeStamp, keyVersion, keyType, keyblock); |
| } |
| |
| byte[] readKey(int length) throws IOException { |
| byte[] bytes = new byte[length]; |
| read(bytes, 0, length); |
| return bytes; |
| } |
| |
| KerberosTime readTimeStamp() throws IOException { |
| index -= 4; |
| return new KerberosTime((long)read(4) * 1000); |
| } |
| |
| String readName() throws IOException { |
| String name; |
| int length = read(2); //length of the realm name or service name |
| index -= 2; |
| byte[] bytes = new byte[length]; |
| read(bytes, 0, length); |
| index -= length; |
| name = new String(bytes); |
| if (DEBUG) { |
| System.out.println(">>> KeyTabInputStream, readName(): " + name); |
| } |
| return name; |
| } |
| } |