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/* Copyright (C) 2002-2005 RealVNC Ltd. 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.
*/
//
// SSecurityVncAuth
//
// XXX not thread-safe, because d3des isn't - do we need to worry about this?
//
#include <rfb/SSecurityVncAuth.h>
#include <rdr/RandomStream.h>
#include <rfb/SConnection.h>
#include <rfb/Password.h>
#include <rfb/Configuration.h>
#include <rfb/LogWriter.h>
#include <rfb/util.h>
#include <rfb/Exception.h>
#include <string.h>
#include <stdio.h>
extern "C" {
#include <rfb/d3des.h>
}
using namespace rfb;
static LogWriter vlog("SVncAuth");
StringParameter SSecurityVncAuth::vncAuthPasswdFile
("PasswordFile", "Password file for VNC authentication", "", ConfServer);
AliasParameter rfbauth("rfbauth", "Alias for PasswordFile",
&SSecurityVncAuth::vncAuthPasswdFile, ConfServer);
VncAuthPasswdParameter SSecurityVncAuth::vncAuthPasswd
("Password", "Obfuscated binary encoding of the password which clients must supply to "
"access the server", &SSecurityVncAuth::vncAuthPasswdFile);
SSecurityVncAuth::SSecurityVncAuth(void)
: sentChallenge(false), responsePos(0), pg(&vncAuthPasswd)
{
}
bool SSecurityVncAuth::processMsg(SConnection* sc)
{
rdr::InStream* is = sc->getInStream();
rdr::OutStream* os = sc->getOutStream();
if (!sentChallenge) {
rdr::RandomStream rs;
rs.readBytes(challenge, vncAuthChallengeSize);
os->writeBytes(challenge, vncAuthChallengeSize);
os->flush();
sentChallenge = true;
return false;
}
while (responsePos < vncAuthChallengeSize && is->checkNoWait(1))
response[responsePos++] = is->readU8();
if (responsePos < vncAuthChallengeSize) return false;
PlainPasswd passwd(pg->getVncAuthPasswd());
if (!passwd.buf)
throw AuthFailureException("No password configured for VNC Auth");
// Calculate the expected response
rdr::U8 key[8];
int pwdLen = strlen(passwd.buf);
for (int i=0; i<8; i++)
key[i] = i<pwdLen ? passwd.buf[i] : 0;
deskey(key, EN0);
for (int j = 0; j < vncAuthChallengeSize; j += 8)
des(challenge+j, challenge+j);
// Check the actual response
if (memcmp(challenge, response, vncAuthChallengeSize) != 0)
throw AuthFailureException();
return true;
}
VncAuthPasswdParameter::VncAuthPasswdParameter(const char* name,
const char* desc,
StringParameter* passwdFile_)
: BinaryParameter(name, desc, 0, 0, ConfServer), passwdFile(passwdFile_) {
}
char* VncAuthPasswdParameter::getVncAuthPasswd() {
ObfuscatedPasswd obfuscated;
getData((void**)&obfuscated.buf, &obfuscated.length);
if (obfuscated.length == 0) {
if (passwdFile) {
CharArray fname(passwdFile->getData());
if (!fname.buf[0]) {
vlog.info("neither %s nor %s params set", getName(), passwdFile->getName());
return 0;
}
FILE* fp = fopen(fname.buf, "r");
if (!fp) {
vlog.error("opening password file '%s' failed",fname.buf);
return 0;
}
vlog.debug("reading password file");
obfuscated.buf = new char[128];
obfuscated.length = fread(obfuscated.buf, 1, 128, fp);
fclose(fp);
} else {
vlog.info("%s parameter not set", getName());
}
}
try {
PlainPasswd password(obfuscated);
return password.takeBuf();
} catch (...) {
return 0;
}
}
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