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/*
* Copyright (C) 2005-2006 Martin Koegler
* Copyright (C) 2006 OCCAM Financial Technology
* Copyright (C) 2010 TigerVNC Team
* Copyright (C) 2011 Brian P. Hinz
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*/
package com.tigervnc.rfb;
import java.util.*;
import com.tigervnc.rdr.*;
public class CSecurityVeNCrypt extends CSecurity {
public CSecurityVeNCrypt(SecurityClient sec)
{
haveRecvdMajorVersion = false;
haveRecvdMinorVersion = false;
haveSentVersion = false;
haveAgreedVersion = false;
haveListOfTypes = false;
haveNumberOfTypes = false;
haveChosenType = false;
majorVersion = 0;
minorVersion = 0;
chosenType = Security.secTypeVeNCrypt;
nAvailableTypes = 0;
availableTypes = null;
iAvailableType = 0;
security = sec;
}
public boolean processMsg(CConnection cc) {
InStream is = cc.getInStream();
OutStream os = cc.getOutStream();
/* get major, minor versions, send what we can support (or 0.0 for can't support it) */
if (!haveRecvdMinorVersion) {
minorVersion = is.readU8();
haveRecvdMinorVersion = true;
return false;
}
if (!haveRecvdMajorVersion) {
majorVersion = is.readU8();
haveRecvdMajorVersion = true;
}
/* major version in upper 8 bits and minor version in lower 8 bits */
int Version = (majorVersion << 8) | 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(majorVersion);
os.writeU8(minorVersion);
os.flush();
throw new Exception("Server reported an unsupported VeNCrypt version");
}
haveSentVersion = true;
return false;
}
/* Check that the server is OK */
if (!haveAgreedVersion) {
if (is.readU8() != 0)
throw new Exception("Server reported it could not support the VeNCrypt version");
haveAgreedVersion = true;
return false;
}
/* get a number of types */
if (!haveNumberOfTypes) {
nAvailableTypes = is.readU8();
iAvailableType = 0;
if (nAvailableTypes <= 0)
throw new Exception("The server reported no VeNCrypt sub-types");
availableTypes = new int[nAvailableTypes];
haveNumberOfTypes = true;
return false;
}
if (nAvailableTypes > 0) {
/* read in the types possible */
if (!haveListOfTypes) {
if (is.checkNoWait(4)) {
availableTypes[iAvailableType++] = is.readU32();
haveListOfTypes = (iAvailableType >= nAvailableTypes);
vlog.debug("Server offers security type "+
Security.secTypeName(availableTypes[iAvailableType - 1])+" ("+
availableTypes[iAvailableType - 1]+")");
if (!haveListOfTypes)
return false;
} else
return false;
}
/* make a choice and send it to the server, meanwhile set up the stack */
if (!haveChosenType) {
chosenType = Security.secTypeInvalid;
int i;
Iterator<Integer> j;
List<Integer> secTypes = new ArrayList<Integer>();
secTypes = Security.GetEnabledExtSecTypes();
/* Honor server's security type order */
for (i = 0; i < nAvailableTypes; i++) {
for (j = secTypes.iterator(); j.hasNext(); ) {
int refType = (Integer)j.next();
if (refType == availableTypes[i]) {
chosenType = refType;
break;
}
}
if (chosenType != Security.secTypeInvalid)
break;
}
vlog.debug("Choosing security type "+Security.secTypeName(chosenType)+
" ("+chosenType+")");
/* Set up the stack according to the chosen type: */
if (chosenType == Security.secTypeInvalid || chosenType == Security.secTypeVeNCrypt)
throw new AuthFailureException("No valid VeNCrypt sub-type");
csecurity = security.GetCSecurity(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 new AuthFailureException("The server reported 0 VeNCrypt sub-types");
}
return csecurity.processMsg(cc);
}
public final int getType() { return chosenType; }
public final String description() { return Security.secTypeName(chosenType); }
public static StringParameter secTypesStr;
private CSecurity csecurity;
SecurityClient security;
private boolean haveRecvdMajorVersion;
private boolean haveRecvdMinorVersion;
private boolean haveSentVersion;
private boolean haveAgreedVersion;
private boolean haveListOfTypes;
private boolean haveNumberOfTypes;
private boolean haveChosenType;
private int majorVersion, minorVersion;
private int chosenType;
private int nAvailableTypes;
private int[] availableTypes;
private int iAvailableType;
//private final String desc;
static LogWriter vlog = new LogWriter("CSecurityVeNCrypt");
}
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