| /* |
| * 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.crypto; |
| |
| import sun.security.krb5.internal.*; |
| import sun.security.krb5.Config; |
| import sun.security.krb5.EncryptedData; |
| import sun.security.krb5.EncryptionKey; |
| import sun.security.krb5.KrbException; |
| import sun.security.krb5.KrbCryptoException; |
| import javax.crypto.*; |
| import java.util.Arrays; |
| import java.util.List; |
| import java.util.ArrayList; |
| |
| //only needed if dataSize() implementation changes back to spec; |
| //see dataSize() below |
| |
| public abstract class EType { |
| |
| private static final boolean DEBUG = Krb5.DEBUG; |
| private static final boolean ALLOW_WEAK_CRYPTO; |
| |
| static { |
| boolean allowed = true; |
| try { |
| Config cfg = Config.getInstance(); |
| String temp = cfg.getDefault("allow_weak_crypto", "libdefaults"); |
| if (temp != null && temp.equals("false")) allowed = false; |
| } catch (Exception exc) { |
| if (DEBUG) { |
| System.out.println ("Exception in getting allow_weak_crypto, " + |
| "using default value " + |
| exc.getMessage()); |
| } |
| } |
| ALLOW_WEAK_CRYPTO = allowed; |
| } |
| |
| public static EType getInstance (int eTypeConst) |
| throws KdcErrException { |
| EType eType = null; |
| String eTypeName = null; |
| switch (eTypeConst) { |
| case EncryptedData.ETYPE_NULL: |
| eType = new NullEType(); |
| eTypeName = "sun.security.krb5.internal.crypto.NullEType"; |
| break; |
| case EncryptedData.ETYPE_DES_CBC_CRC: |
| eType = new DesCbcCrcEType(); |
| eTypeName = "sun.security.krb5.internal.crypto.DesCbcCrcEType"; |
| break; |
| case EncryptedData.ETYPE_DES_CBC_MD5: |
| eType = new DesCbcMd5EType(); |
| eTypeName = "sun.security.krb5.internal.crypto.DesCbcMd5EType"; |
| break; |
| |
| case EncryptedData.ETYPE_DES3_CBC_HMAC_SHA1_KD: |
| eType = new Des3CbcHmacSha1KdEType(); |
| eTypeName = |
| "sun.security.krb5.internal.crypto.Des3CbcHmacSha1KdEType"; |
| break; |
| |
| case EncryptedData.ETYPE_AES128_CTS_HMAC_SHA1_96: |
| eType = new Aes128CtsHmacSha1EType(); |
| eTypeName = |
| "sun.security.krb5.internal.crypto.Aes128CtsHmacSha1EType"; |
| break; |
| |
| case EncryptedData.ETYPE_AES256_CTS_HMAC_SHA1_96: |
| eType = new Aes256CtsHmacSha1EType(); |
| eTypeName = |
| "sun.security.krb5.internal.crypto.Aes256CtsHmacSha1EType"; |
| break; |
| |
| case EncryptedData.ETYPE_ARCFOUR_HMAC: |
| eType = new ArcFourHmacEType(); |
| eTypeName = "sun.security.krb5.internal.crypto.ArcFourHmacEType"; |
| break; |
| |
| default: |
| String msg = "encryption type = " + toString(eTypeConst) |
| + " (" + eTypeConst + ")"; |
| throw new KdcErrException(Krb5.KDC_ERR_ETYPE_NOSUPP, msg); |
| } |
| if (DEBUG) { |
| System.out.println(">>> EType: " + eTypeName); |
| } |
| return eType; |
| } |
| |
| public abstract int eType(); |
| |
| public abstract int minimumPadSize(); |
| |
| public abstract int confounderSize(); |
| |
| public abstract int checksumType(); |
| |
| public abstract int checksumSize(); |
| |
| public abstract int blockSize(); |
| |
| public abstract int keyType(); |
| |
| public abstract int keySize(); |
| |
| public abstract byte[] encrypt(byte[] data, byte[] key, int usage) |
| throws KrbCryptoException; |
| |
| public abstract byte[] encrypt(byte[] data, byte[] key, byte[] ivec, |
| int usage) throws KrbCryptoException; |
| |
| public abstract byte[] decrypt(byte[] cipher, byte[] key, int usage) |
| throws KrbApErrException, KrbCryptoException; |
| |
| public abstract byte[] decrypt(byte[] cipher, byte[] key, byte[] ivec, |
| int usage) throws KrbApErrException, KrbCryptoException; |
| |
| public int dataSize(byte[] data) |
| // throws Asn1Exception |
| { |
| // EncodeRef ref = new EncodeRef(data, startOfData()); |
| // return ref.end - startOfData(); |
| // should be the above according to spec, but in fact |
| // implementations include the pad bytes in the data size |
| return data.length - startOfData(); |
| } |
| |
| public int padSize(byte[] data) { |
| return data.length - confounderSize() - checksumSize() - |
| dataSize(data); |
| } |
| |
| public int startOfChecksum() { |
| return confounderSize(); |
| } |
| |
| public int startOfData() { |
| return confounderSize() + checksumSize(); |
| } |
| |
| public int startOfPad(byte[] data) { |
| return confounderSize() + checksumSize() + dataSize(data); |
| } |
| |
| public byte[] decryptedData(byte[] data) { |
| int tempSize = dataSize(data); |
| byte[] result = new byte[tempSize]; |
| System.arraycopy(data, startOfData(), result, 0, tempSize); |
| return result; |
| } |
| |
| // Note: the first 2 entries of BUILTIN_ETYPES and BUILTIN_ETYPES_NOAES256 |
| // should be kept DES-related. They will be removed when allow_weak_crypto |
| // is set to false. |
| |
| private static final int[] BUILTIN_ETYPES = new int[] { |
| EncryptedData.ETYPE_DES_CBC_MD5, |
| EncryptedData.ETYPE_DES_CBC_CRC, |
| EncryptedData.ETYPE_ARCFOUR_HMAC, |
| EncryptedData.ETYPE_DES3_CBC_HMAC_SHA1_KD, |
| EncryptedData.ETYPE_AES128_CTS_HMAC_SHA1_96, |
| EncryptedData.ETYPE_AES256_CTS_HMAC_SHA1_96, |
| }; |
| |
| private static final int[] BUILTIN_ETYPES_NOAES256 = new int[] { |
| EncryptedData.ETYPE_DES_CBC_MD5, |
| EncryptedData.ETYPE_DES_CBC_CRC, |
| EncryptedData.ETYPE_ARCFOUR_HMAC, |
| EncryptedData.ETYPE_DES3_CBC_HMAC_SHA1_KD, |
| EncryptedData.ETYPE_AES128_CTS_HMAC_SHA1_96, |
| }; |
| |
| |
| // used in Config |
| public static int[] getBuiltInDefaults() { |
| int allowed = 0; |
| try { |
| allowed = Cipher.getMaxAllowedKeyLength("AES"); |
| } catch (Exception e) { |
| // should not happen |
| } |
| int[] result; |
| if (allowed < 256) { |
| result = BUILTIN_ETYPES_NOAES256; |
| } else { |
| result = BUILTIN_ETYPES; |
| } |
| if (!ALLOW_WEAK_CRYPTO) { |
| // The first 2 etypes are now weak ones |
| return Arrays.copyOfRange(result, 2, result.length); |
| } |
| return result; |
| } |
| |
| /** |
| * Retrieves the default etypes from the configuration file, or |
| * if that's not available, return the built-in list of default etypes. |
| */ |
| // used in KrbAsReq, KeyTab |
| public static int[] getDefaults(String configName) { |
| try { |
| return Config.getInstance().defaultEtype(configName); |
| } catch (KrbException exc) { |
| if (DEBUG) { |
| System.out.println("Exception while getting " + |
| configName + exc.getMessage()); |
| System.out.println("Using default builtin etypes"); |
| } |
| return getBuiltInDefaults(); |
| } |
| } |
| |
| /** |
| * Retrieve the default etypes from the configuration file for |
| * those etypes for which there are corresponding keys. |
| * Used in scenario we have some keys from a keytab with etypes |
| * different from those named in configName. Then, in order |
| * to decrypt an AS-REP, we should only ask for etypes for which |
| * we have keys. |
| */ |
| public static int[] getDefaults(String configName, EncryptionKey[] keys) |
| throws KrbException { |
| int[] answer = getDefaults(configName); |
| if (answer == null) { |
| throw new KrbException("No supported encryption types listed in " |
| + configName); |
| } |
| |
| List<Integer> list = new ArrayList<Integer> (answer.length); |
| for (int i = 0; i < answer.length; i++) { |
| if (EncryptionKey.findKey(answer[i], keys) != null) { |
| list.add(answer[i]); |
| } |
| } |
| int len = list.size(); |
| if (len <= 0) { |
| StringBuffer keystr = new StringBuffer(); |
| for (int i = 0; i < keys.length; i++) { |
| keystr.append(toString(keys[i].getEType())); |
| keystr.append(" "); |
| } |
| throw new KrbException( |
| "Do not have keys of types listed in " + configName + |
| " available; only have keys of following type: " + |
| keystr.toString()); |
| } else { |
| answer = new int[len]; |
| for (int i = 0; i < len; i++) { |
| answer[i] = list.get(i); |
| } |
| return answer; |
| } |
| } |
| |
| public static boolean isSupported(int eTypeConst, int[] config) { |
| for (int i = 0; i < config.length; i++) { |
| if (eTypeConst == config[i]) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| public static boolean isSupported(int eTypeConst) { |
| int[] enabledETypes = getBuiltInDefaults(); |
| return isSupported(eTypeConst, enabledETypes); |
| } |
| |
| public static String toString(int type) { |
| switch (type) { |
| case 0: |
| return "NULL"; |
| case 1: |
| return "DES CBC mode with CRC-32"; |
| case 2: |
| return "DES CBC mode with MD4"; |
| case 3: |
| return "DES CBC mode with MD5"; |
| case 4: |
| return "reserved"; |
| case 5: |
| return "DES3 CBC mode with MD5"; |
| case 6: |
| return "reserved"; |
| case 7: |
| return "DES3 CBC mode with SHA1"; |
| case 9: |
| return "DSA with SHA1- Cms0ID"; |
| case 10: |
| return "MD5 with RSA encryption - Cms0ID"; |
| case 11: |
| return "SHA1 with RSA encryption - Cms0ID"; |
| case 12: |
| return "RC2 CBC mode with Env0ID"; |
| case 13: |
| return "RSA encryption with Env0ID"; |
| case 14: |
| return "RSAES-0AEP-ENV-0ID"; |
| case 15: |
| return "DES-EDE3-CBC-ENV-0ID"; |
| case 16: |
| return "DES3 CBC mode with SHA1-KD"; |
| case 17: |
| return "AES128 CTS mode with HMAC SHA1-96"; |
| case 18: |
| return "AES256 CTS mode with HMAC SHA1-96"; |
| case 23: |
| return "RC4 with HMAC"; |
| case 24: |
| return "RC4 with HMAC EXP"; |
| |
| } |
| return "Unknown (" + type + ")"; |
| } |
| } |