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/*
* Copyright (C) 2005-2006 Martin Koegler
* Copyright (C) 2006 OCCAM Financial Technology
* Copyright (C) 2010 TigerVNC Team
*
* 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.
*/
/*
* SSecurityVeNCrypt
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <rfb/SSecurityVeNCrypt.h>
#include <rfb/Exception.h>
#include <rfb/LogWriter.h>
#include <rdr/InStream.h>
#include <rdr/OutStream.h>
using namespace rfb;
using namespace rdr;
using namespace std;
static LogWriter vlog("SVeNCrypt");
SSecurityVeNCrypt::SSecurityVeNCrypt(SConnection* sc_,
SecurityServer *sec)
: SSecurity(sc_), security(sec)
{
ssecurity = nullptr;
haveSentVersion = false;
haveRecvdMajorVersion = false;
haveRecvdMinorVersion = false;
majorVersion = 0;
minorVersion = 0;
haveSentTypes = false;
haveChosenType = false;
chosenType = secTypeVeNCrypt;
numTypes = 0;
subTypes = nullptr;
}
SSecurityVeNCrypt::~SSecurityVeNCrypt()
{
delete ssecurity;
delete [] subTypes;
}
bool SSecurityVeNCrypt::processMsg()
{
rdr::InStream* is = sc->getInStream();
rdr::OutStream* os = sc->getOutStream();
uint8_t i;
/* VeNCrypt initialization */
/* Send the highest version we can support */
if (!haveSentVersion) {
os->writeU8(0);
os->writeU8(2);
haveSentVersion = true;
os->flush();
}
/* Receive back highest version that client can support (up to and including ours) */
if (!haveRecvdMajorVersion) {
if (!is->hasData(1))
return false;
majorVersion = is->readU8();
haveRecvdMajorVersion = true;
}
if (!haveRecvdMinorVersion) {
if (!is->hasData(1))
return false;
minorVersion = is->readU8();
haveRecvdMinorVersion = true;
/* WORD value with major version in upper 8 bits and minor version in lower 8 bits */
uint16_t Version = (((uint16_t)majorVersion) << 8) | ((uint16_t)minorVersion);
switch (Version) {
case 0x0000: /* 0.0 - The client cannot support us! */
case 0x0001: /* 0.1 Legacy VeNCrypt, not supported */
os->writeU8(0xFF); /* This is not OK */
os->flush();
throw AuthFailureException("The client cannot support the server's "
"VeNCrypt version");
case 0x0002: /* 0.2 */
os->writeU8(0); /* OK */
break;
default:
os->writeU8(0xFF); /* Not OK */
os->flush();
throw AuthFailureException("The client returned an unsupported VeNCrypt version");
}
}
/*
* send number of supported VeNCrypt authentication types (uint8_t)
* followed by authentication types (uint32_t:s)
*/
if (!haveSentTypes) {
list<uint32_t> listSubTypes;
listSubTypes = security->GetEnabledExtSecTypes();
numTypes = listSubTypes.size();
subTypes = new uint32_t[numTypes];
for (i = 0; i < numTypes; i++) {
subTypes[i] = listSubTypes.front();
listSubTypes.pop_front();
}
if (numTypes) {
os->writeU8(numTypes);
for (i = 0; i < numTypes; i++)
os->writeU32(subTypes[i]);
os->flush();
haveSentTypes = true;
} else
throw AuthFailureException("There are no VeNCrypt sub-types to send to the client");
}
/* get type back from client (must be one of the ones we sent) */
if (!haveChosenType) {
if (!is->hasData(4))
return false;
chosenType = is->readU32();
for (i = 0; i < numTypes; i++) {
if (chosenType == subTypes[i]) {
haveChosenType = true;
break;
}
}
if (!haveChosenType)
chosenType = secTypeInvalid;
vlog.info("Client requests security type %s (%d)", secTypeName(chosenType),
chosenType);
/* Set up the stack according to the chosen type */
if (chosenType == secTypeInvalid || chosenType == secTypeVeNCrypt)
throw AuthFailureException("No valid VeNCrypt sub-type");
ssecurity = security->GetSSecurity(sc, chosenType);
}
/* continue processing the messages */
return ssecurity->processMsg();
}
const char* SSecurityVeNCrypt::getUserName() const
{
if (ssecurity == nullptr)
return nullptr;
return ssecurity->getUserName();
}
AccessRights SSecurityVeNCrypt::getAccessRights() const
{
if (ssecurity == nullptr)
return SSecurity::getAccessRights();
return ssecurity->getAccessRights();
}
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