519 lines
10 KiB
C++
519 lines
10 KiB
C++
/*
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* Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/* $Id: EncryptOption.cpp,v 1.1.1.1 2000/06/16 18:46:21 thorpej Exp $ */
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#include <Windows.h>
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#include "EncryptOption.h"
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#include "CryptoEngine.h"
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#include "TelnetEngine.h"
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EncryptOption::EncryptOption(CharStream *stream, TelnetEngine* engine)
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: Option(stream, engine, ENCRYPT_OPT)
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{
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mReadyToEncrypt = FALSE;
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mIVCount = 0;
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pCryptoEngine = pTEngine->mCryptoEngine;
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}
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EncryptOption::~EncryptOption()
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{
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}
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void
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EncryptOption::NegotiateOption(unsigned char command)
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{
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unsigned char c;
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switch (command) {
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case DO:
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if(pTEngine->mAuthenticated){
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if (!pTEngine->mCryptoEngine){
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pCryptoEngine = pTEngine->mCryptoEngine = new CryptoEngine(&pTEngine->enckey);
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}
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sendEncrypt(WILL);
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} else {
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sendEncrypt(WONT);
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}
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stream->MarkAsRead();
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break;
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case WILL:
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if(pTEngine->mAuthenticated){
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if (!pTEngine->mCryptoEngine){
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pCryptoEngine = pTEngine->mCryptoEngine = new CryptoEngine(&pTEngine->enckey);
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}
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sendEncrypt(DO);
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sendREQSTART();
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sendSUPPORT();
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} else {
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sendEncrypt(DONT);
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}
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stream->MarkAsRead();
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break;
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case SB:
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if (!stream->GetChar (&c))
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return;
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switch (c) {
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case SUPPORT:
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recievedSUPPORT ();
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break;
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case REPLY:
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recievedREPLY ();
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break;
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case IS:
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recievedIS();
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break;
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case REQUEST_START:
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break;
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case REQUEST_END:
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recievedREQEND ();
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break;
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case DEC_KEYID:
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recievedDEC_KEYID ();
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break;
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case ENC_KEYID:
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recievedENC_KEYID ();
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break;
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case START:
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recievedSTART ();
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break;
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case END:
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recievedEND ();
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break;
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default:
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break;
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}
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break;
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case WONT:
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sendEncrypt (DONT);
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stream->MarkAsRead();
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break;
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case DONT:
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sendEncrypt(WONT);
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stream->MarkAsRead();
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break;
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default:
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break;
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}
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}
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void
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EncryptOption::recievedSUPPORT()
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{
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unsigned char c;
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if (!stream->GetChar(&c))
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return;
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while (TRUE) {
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switch (c){
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case DES_CFB64:
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if (ReadToIACSE ())
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return;
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stream->MarkAsRead();
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sendIS();
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return;
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case IAC:
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if (!stream->GetChar(&c)) // Get SE
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return;
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stream->MarkAsRead();
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sendIS_NULL();
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sendEncrypt(WONT);
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return;
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case DES_OFB64: // in the future
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default:
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if (!stream->GetChar(&c)) /* read next encryption type and
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hope for better luck */
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return;
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break;
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}
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}
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}
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void
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EncryptOption::recievedREPLY()
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{
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unsigned char c;
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BOOL mBuffFull = FALSE;
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int count = 0;
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int i = 0;
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if (!stream->GetChar(&c))
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return;
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if (c != DES_CFB64){
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if(!ReadToIACSE ())
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return;
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stream->MarkAsRead ();
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return;
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}
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// c == DES_CFB64
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if (!stream->GetChar(&c))
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return;
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switch (c){
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case CFB64_IV:
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for (i = 0; !mBuffFull; i++) {
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if (!stream->GetChar(&c))
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return;
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if(c == IAC)
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mEncIV[i++] = IAC;
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mEncIV[i] = c;
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if (++count >= 8)
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mBuffFull = TRUE;
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}
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if (ReadToIACSE ())
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return;
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break;
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case CFB64_IV_OK:
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if (ReadToIACSE ())
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return;
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stream->MarkAsRead ();
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sendENC_KEYID ();
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break;
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default:
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sendEncrypt(WONT);
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break;
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}
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}
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void
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EncryptOption::recievedIS()
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{
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unsigned char c;
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BOOL mBuffFull = FALSE;
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int count = 0;
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if (!stream->GetChar(&c))
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return;
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while (TRUE) {
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int i = 0;
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switch (c){
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case DES_CFB64:
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if (!stream->GetChar (&c))
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return;
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switch (c){
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case CFB64_IV:
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// Get Initvec and start negotiate KEYID
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for (; !mBuffFull; i++) {
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if (!stream->GetChar(&c))
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return;
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if(c == IAC)
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if(!stream->GetChar(&c))
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return;
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pCryptoEngine->mDecInitVec[i] = c;
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if (++count >= 8)
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mBuffFull = TRUE;
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}
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mIVCount = count;
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if (ReadToIACSE ())
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return;
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stream->MarkAsRead ();
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sendREPLY(CFB64_IV_OK);
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return;
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case CFB64_IV_OK:
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sendENC_KEYID();
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if (!ReadToIACSE ())
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return;
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stream->MarkAsRead ();
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return;
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default:
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// Encryptrion negotiation failed
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sendEncrypt (WONT);
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break;
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}
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case IAC:
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if (!stream->GetChar(&c)) // Get SE
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return;
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stream->MarkAsRead();
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sendEncrypt(WONT);
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return;
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break;
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case DES_OFB64: // in the future
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default:
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if (!stream->GetChar(&c)) // read next encryption type and hope for better luck
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return;
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break;
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}
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}
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}
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void
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EncryptOption::recievedENC_KEYID ()
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{
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unsigned char c;
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if(!stream->GetChar(&c))
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return;
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if (c == DEF_KEYID){
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sendDEC_KEYID(DEF_KEYID);
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sendREQSTART();
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}
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else
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sendDEC_KEYID(-1);
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if(ReadToIACSE ())
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return;
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stream->MarkAsRead();
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}
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void
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EncryptOption::recievedDEC_KEYID()
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{
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unsigned char c;
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if (!stream->GetChar(&c))
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return;
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if (c != DEF_KEYID) {
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sendEncrypt(WONT);
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if (c == IAC)
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if (!stream->GetChar (&c)) //Get SE
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return;
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if (ReadToIACSE ())
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return;
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} else {
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sendSTART();
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if (ReadToIACSE ())
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return;
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}
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stream->MarkAsRead ();
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}
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void
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EncryptOption::recievedREQSTART ()
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{
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stream->MarkAsRead();
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}
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void
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EncryptOption::recievedREQEND ()
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{
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sendEND ();
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pTEngine->mEncrypt = FALSE;
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stream->MarkAsRead();
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}
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void
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EncryptOption::recievedSTART ()
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{
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unsigned char* data;
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unsigned int size;
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// If encryption is not already active, decrypt rest of stream
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// since that have not been done yet.
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if(!pTEngine->mDecrypt) {
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if(ReadToIACSE()) return;
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stream->MarkAsRead();
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while(stream->GetBuffer(&data, &size))
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pTEngine->mCryptoEngine->Decrypt(data, data, size);
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stream->RestoreToMark();
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} else {
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if(ReadToIACSE()) return;
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stream->MarkAsRead();
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}
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pTEngine->mDecrypt = TRUE;
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pTEngine->mTelnetSession->mTerminalEngine->SetEncryptFlag(pTEngine->mDecrypt); // XXX
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sendSTART();
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}
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void
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EncryptOption::recievedEND ()
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{
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unsigned char* data;
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unsigned int size;
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// If encryption is active, undo decryption of rest of stream
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// since that have been decrypted.
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if(pTEngine->mDecrypt) {
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if(ReadToIACSE()) return;
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stream->MarkAsRead();
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if(stream->GetBuffer(&data, &size))
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pTEngine->mCryptoEngine->UndoDecrypt(data, size);
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stream->RestoreToMark();
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} else {
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if(ReadToIACSE()) return;
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stream->MarkAsRead();
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}
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pTEngine->mDecrypt = FALSE;
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}
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void EncryptOption::sendEncrypt (int command)
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{
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unsigned char mBuf[3];
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mBuf[0] = IAC;
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mBuf[1] = command;
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mBuf[2] = ENCRYPT_OPT;
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SendReply(mBuf, 3);
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}
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void EncryptOption::sendSUPPORT ()
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{
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unsigned char mBuf[] = {IAC, SB, ENCRYPT_OPT, SUPPORT, DES_CFB64, IAC, SE};
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SendReply(mBuf, 7);
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}
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void EncryptOption::sendREPLY (int answer)
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{
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unsigned char mBuf[8];
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mBuf[0] = IAC;
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mBuf[1] = SB;
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mBuf[2] = ENCRYPT_OPT;
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mBuf[3] = REPLY;
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mBuf[4] = DES_CFB64;
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mBuf[5] = answer;
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mBuf[6] = IAC;
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mBuf[7] = SE;
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SendReply(mBuf, 8);
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}
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void EncryptOption::sendIS ()
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{
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int i = 0;
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unsigned char mBuf[24];
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unsigned char mRandBuf[8];
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int mRandCount = 0;
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mBuf[0] = IAC;
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mBuf[1] = SB;
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mBuf[2] = ENCRYPT_OPT;
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mBuf[3] = IS;
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mBuf[4] = DES_CFB64;
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mBuf[5] = CFB64_IV;
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pCryptoEngine->RandData (mRandBuf, 8); // Generates ivec for cfb64
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for (int j = 0; j < 8; j++)
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pCryptoEngine->mEncInitVec[j] = mRandBuf[j];
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for(j = 0; mRandCount < 8; i++, j++) {
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if (mRandBuf[j] == IAC)
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mBuf[6 + i++] = IAC;
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mBuf[i + 6] = mRandBuf[j];
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mRandCount++;
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}
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mBuf[6 + i++] = IAC;
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mBuf[6 + i++] = SE;
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SendReply(mBuf, 6 + i);
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}
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void EncryptOption::sendREQSTART ()
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{
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unsigned char mBuf[] = {IAC, SB, ENCRYPT_OPT, REQUEST_START, IAC, SE};
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SendReply(mBuf, 6);
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}
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void EncryptOption::sendREQEND ()
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{
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unsigned char mBuf[] = {IAC, SB, ENCRYPT_OPT, REQUEST_END, IAC, SE};
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SendReply(mBuf, 6);
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}
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void EncryptOption::sendDEC_KEYID (int option)
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{
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unsigned char mBuf[7], *p = mBuf;
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*p++ = IAC;
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*p++ = SB;
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*p++ = ENCRYPT_OPT;
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*p++ = DEC_KEYID;
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if(option >= 0)
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*p++ = option;
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*p++ = IAC;
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*p++ = SE;
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SendReply(mBuf, p - mBuf);
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}
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void EncryptOption::sendENC_KEYID ()
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{
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unsigned char mBuf[] = {IAC, SB, ENCRYPT_OPT, ENC_KEYID, DEF_KEYID, IAC, SE};
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SendReply(mBuf, 7);
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}
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void EncryptOption::sendSTART()
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{
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unsigned char mBuf[] = {IAC, SB, ENCRYPT_OPT, START, IAC, SE};
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SendReply(mBuf, 6);
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pTEngine->mEncrypt = TRUE;
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}
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void EncryptOption::sendEND ()
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{
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unsigned char mBuf[] = {IAC, SB, ENCRYPT_OPT, END, IAC, SE};
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SendReply(mBuf, 6);
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pTEngine->mEncrypt = FALSE;
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}
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void EncryptOption::sendIS_NULL(void)
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{
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unsigned char mBuf[7];
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mBuf[0] = IAC;
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mBuf[1] = SB;
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mBuf[2] = ENCRYPT_OPT;
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mBuf[3] = IS;
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mBuf[4] = NULL;
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mBuf[5] = IAC;
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mBuf[6] = SE;
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SendReply(mBuf, 7);
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}
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void EncryptOption::ExecOption(unsigned int Command, void* Data)
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{
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switch(Command) {
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case ENCRYPT_ON:
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sendREQSTART();
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sendSTART();
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break;
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case ENCRYPT_OFF:
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sendREQEND();
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sendEND();
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break;
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}
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}
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