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/*
* auth.c - deal with authentication.
*
* This file implements the VNC authentication protocol when setting up an RFB
* connection.
*/
/*
* OSXvnc Copyright (C) 2001 Dan McGuirk <mcguirk@incompleteness.net>.
* Original Xvnc code Copyright (C) 1999 AT&T Laboratories Cambridge.
* All Rights Reserved.
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This software 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include "rfb.h"
char *rfbAuthPasswdFile = NULL;
/*
* rfbAuthNewClient is called when we reach the point of authenticating
* a new client. If authentication isn't being used then we simply send
* rfbNoAuth. Otherwise we send rfbVncAuth plus the challenge.
*/
void
rfbAuthNewClient(cl)
rfbClientPtr cl;
{
char buf[4 + CHALLENGESIZE];
int len;
cl->state = RFB_AUTHENTICATION;
if (rfbAuthPasswdFile && !cl->reverseConnection) {
*(CARD32 *)buf = Swap32IfLE(rfbVncAuth);
vncRandomBytes(cl->authChallenge);
memcpy(&buf[4], (char *)cl->authChallenge, CHALLENGESIZE);
len = 4 + CHALLENGESIZE;
} else {
*(CARD32 *)buf = Swap32IfLE(rfbNoAuth);
len = 4;
cl->state = RFB_INITIALISATION;
}
if (WriteExact(cl, buf, len) < 0) {
rfbLogPerror("rfbAuthNewClient: write");
rfbCloseClient(cl);
return;
}
}
/*
* rfbAuthProcessClientMessage is called when the client sends its
* authentication response.
*/
void
rfbAuthProcessClientMessage(cl)
rfbClientPtr cl;
{
char *passwd;
int i, n;
CARD8 response[CHALLENGESIZE];
CARD32 authResult;
if ((n = ReadExact(cl, (char *)response, CHALLENGESIZE)) <= 0) {
if (n != 0)
rfbLogPerror("rfbAuthProcessClientMessage: read");
rfbCloseClient(cl);
return;
}
passwd = vncDecryptPasswdFromFile(rfbAuthPasswdFile);
if (passwd == NULL) {
rfbLog("rfbAuthProcessClientMessage: could not get password from %s\n",
rfbAuthPasswdFile);
authResult = Swap32IfLE(rfbVncAuthFailed);
if (WriteExact(cl, (char *)&authResult, 4) < 0) {
rfbLogPerror("rfbAuthProcessClientMessage: write");
}
rfbCloseClient(cl);
return;
}
vncEncryptBytes(cl->authChallenge, passwd);
/* Lose the password from memory */
for (i = strlen(passwd); i >= 0; i--) {
passwd[i] = '\0';
}
free((char *)passwd);
if (memcmp(cl->authChallenge, response, CHALLENGESIZE) != 0) {
rfbLog("rfbAuthProcessClientMessage: authentication failed from %s\n",
cl->host);
authResult = Swap32IfLE(rfbVncAuthFailed);
if (WriteExact(cl, (char *)&authResult, 4) < 0) {
rfbLogPerror("rfbAuthProcessClientMessage: write");
}
rfbCloseClient(cl);
return;
}
authResult = Swap32IfLE(rfbVncAuthOK);
if (WriteExact(cl, (char *)&authResult, 4) < 0) {
rfbLogPerror("rfbAuthProcessClientMessage: write");
rfbCloseClient(cl);
return;
}
cl->state = RFB_INITIALISATION;
}
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