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/*
* Copyright (C) 2006 OCCAM Financial Technology
* Copyright (C) 2005-2006 Martin Koegler
* 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.
*/
//
// CSecurityVeNCrypt
//
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <algorithm>
#include <list>
#include <rfb/Exception.h>
#include <rdr/InStream.h>
#include <rdr/OutStream.h>
#include <rfb/CConnection.h>
#include <rfb/CSecurityVeNCrypt.h>
#include <rfb/LogWriter.h>
using namespace rfb;
static LogWriter vlog("CVeNCrypt");
CSecurityVeNCrypt::CSecurityVeNCrypt(CConnection* cc_,
SecurityClient* sec)
: CSecurity(cc_), csecurity(nullptr), security(sec)
{
haveRecvdMajorVersion = false;
haveRecvdMinorVersion = false;
haveSentVersion = false;
haveAgreedVersion = false;
haveListOfTypes = false;
haveNumberOfTypes = false;
haveChosenType = false;
majorVersion = 0;
minorVersion = 0;
chosenType = secTypeVeNCrypt;
nAvailableTypes = 0;
availableTypes = nullptr;
}
CSecurityVeNCrypt::~CSecurityVeNCrypt()
{
delete[] availableTypes;
delete csecurity;
}
bool CSecurityVeNCrypt::processMsg()
{
rdr::InStream* is = cc->getInStream();
rdr::OutStream* os = cc->getOutStream();
/* get major, minor versions, send what we can support (or 0.0 for can't support it) */
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;
}
/* major version in upper 8 bits and minor version in lower 8 bits */
uint16_t Version = (((uint16_t) majorVersion) << 8) |
((uint16_t) minorVersion);
if (!haveSentVersion) {
/* Currently we don't support former VeNCrypt 0.1 */
if (Version >= 0x0002) {
majorVersion = 0;
minorVersion = 2;
os->writeU8(majorVersion);
os->writeU8(minorVersion);
os->flush();
} else {
/* Send 0.0 to indicate no support */
majorVersion = 0;
minorVersion = 0;
os->writeU8(0);
os->writeU8(0);
os->flush();
throw protocol_error("The server reported an unsupported VeNCrypt version");
}
haveSentVersion = true;
}
/* Check that the server is OK */
if (!haveAgreedVersion) {
if (!is->hasData(1))
return false;
if (is->readU8())
throw protocol_error("The server reported it could not "
"support the VeNCrypt version");
haveAgreedVersion = true;
}
/* get a number of types */
if (!haveNumberOfTypes) {
if (!is->hasData(1))
return false;
nAvailableTypes = is->readU8();
if (!nAvailableTypes)
throw protocol_error("The server reported no VeNCrypt sub-types");
availableTypes = new uint32_t[nAvailableTypes];
haveNumberOfTypes = true;
}
if (nAvailableTypes) {
/* read in the types possible */
if (!haveListOfTypes) {
if (!is->hasData(4 * nAvailableTypes))
return false;
for (int i = 0;i < nAvailableTypes;i++) {
availableTypes[i] = is->readU32();
vlog.debug("Server offers security type %s (%d)",
secTypeName(availableTypes[i]),
availableTypes[i]);
}
haveListOfTypes = true;
}
/* make a choice and send it to the server, meanwhile set up the stack */
if (!haveChosenType) {
chosenType = secTypeInvalid;
uint8_t i;
std::list<uint32_t> secTypes;
secTypes = security->GetEnabledExtSecTypes();
/* Honor server's security type order */
for (i = 0; i < nAvailableTypes; i++) {
if (std::find(secTypes.begin(), secTypes.end(),
availableTypes[i]) != secTypes.end()) {
chosenType = availableTypes[i];
break;
}
}
/* Set up the stack according to the chosen type: */
if (chosenType == secTypeInvalid || chosenType == secTypeVeNCrypt)
throw protocol_error("No valid VeNCrypt sub-type");
vlog.info("Choosing security type %s (%d)", secTypeName(chosenType),
chosenType);
csecurity = security->GetCSecurity(cc, chosenType);
/* send chosen type to server */
os->writeU32(chosenType);
os->flush();
haveChosenType = true;
}
} else {
/*
* Server told us that there are 0 types it can support - this should not
* happen, since if the server supports 0 sub-types, it doesn't support
* this security type
*/
throw protocol_error("The server reported 0 VeNCrypt sub-types");
}
return csecurity->processMsg();
}
bool CSecurityVeNCrypt::isSecure() const
{
if (csecurity && csecurity->isSecure())
return true;
return false;
}
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