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#include <assert.h>
extern "C" {
#include "vncauth.h"
}
#include "krfblogin.h"
#include "krfbconnection.h"
#include <qtimer.h>
// The length of the various messages (used to decide how many bytes to
// wait for).
const int ServerVersionLength = 12;
const int ClientVersionLength = 12;
const int AuthSchemeLength = 4;
const int FailureReasonSizeLength = 4;
const int ChallengeLength = 16;
const int AuthResultLength = 4;
// Authentication results
enum AuthResult {
AuthOk,
AuthFailed,
AuthTooMany
};
typedef unsigned char CARD8;
typedef unsigned short CARD16;
typedef unsigned long CARD32;
const int endianTest = 1;
// Endian stuff
#define Swap16IfLE(s) \
(*(char *)&endianTest ? ((((s) & 0xff) << 8) | (((s) >> 8) & 0xff)) : (s))
#define Swap32IfLE(l) \
(*(char *)&endianTest ? ((((l) & 0xff000000) >> 24) | \
(((l) & 0x00ff0000) >> 8) | \
(((l) & 0x0000ff00) << 8) | \
(((l) & 0x000000ff) << 24)) : (l))
KRFBLogin::KRFBLogin( KRFBConnection *con )
: QObject( con, "RFB login manager" )
{
assert( con );
this->con = con;
currentState = AwaitingServerVersion;
connect( this, SIGNAL( error( const QString & ) ),
con, SIGNAL( error( const QString & ) ) );
connect( this, SIGNAL( passwordRequired( KRFBConnection * ) ),
con, SIGNAL( passwordRequired( KRFBConnection * ) ) );
qWarning( "Waiting for server version..." );
static QString statusMsg = tr( "Waiting for server version..." );
emit status( statusMsg );
// Kick off the state machine
connect( con, SIGNAL( gotEnoughData() ), SLOT( gotServerVersion() ) );
con->waitForData( ServerVersionLength );
}
KRFBLogin::~KRFBLogin()
{
}
KRFBLogin::State KRFBLogin::state() const
{
return currentState;
}
void KRFBLogin::gotServerVersion()
{
qWarning( "Got server version" );
disconnect( con, SIGNAL( gotEnoughData() ),
this, SLOT( gotServerVersion() ) );
// Read the server's version message
char serverVersion[ ServerVersionLength + 1 ];
con->read( serverVersion, ServerVersionLength );
serverVersion[ ServerVersionLength ] = '\0';
QCString rfbString( serverVersion, ServerVersionLength + 1 );
versionString = rfbString;
QRegExp regexp( "RFB [0-9][0-9][0-9]\\.[0-9][0-9][0-9]\n" );
if ( rfbString.find( regexp ) == -1 ) {
static QString msg = tr( "Error: Invalid server version, %1" ).arg( rfbString );
qWarning( msg );
emit error( msg );
currentState = Error;
return;
}
// Calculate the actual version number
serverMajor = (serverVersion[4] - '0') * 100
+ (serverVersion[5] - '0') * 10
+ (serverVersion[6] - '0');
serverMinor = (serverVersion[8] - '0') * 100
+ (serverVersion[9] - '0') * 10
+ (serverVersion[10] - '0');
qWarning("Server Version: %03d.%03d", serverMajor, serverMinor );
if ( serverMajor != 3 ) {
QString msg = tr( "Error: Unsupported server version, %1" )
.arg( rfbString );
qWarning( msg );
emit error( msg );
currentState = Error;
return;
}
if ( serverMinor != 3 ) {
qWarning( "Minor version mismatch: %d", serverMinor );
}
// Setup for the next state
sendClientVersion();
connect( con, SIGNAL( gotEnoughData() ), SLOT( gotAuthScheme() ) );
con->waitForData( AuthSchemeLength );
}
void KRFBLogin::gotAuthScheme()
{
disconnect( con, SIGNAL( gotEnoughData() ),
this, SLOT( gotAuthScheme() ) );
// Got data
CARD32 scheme;
con->read( &scheme, AuthSchemeLength );
scheme = Swap32IfLE( scheme );
static QString statusMsgOk = tr( "Logged in" );
switch ( scheme ) {
case 0:
qWarning( "Failed" );
// Handle failure
connect( con, SIGNAL( gotEnoughData() ), SLOT( gotFailureReasonSize() ) );
con->waitForData( FailureReasonSizeLength );
break;
case 1:
// Handle no auth
emit status( statusMsgOk );
con->gotRFBConnection();
break;
case 2:
// Handle VNC auth
connect( con, SIGNAL( gotEnoughData() ), SLOT( gotChallenge() ) );
con->waitForData( ChallengeLength );
break;
default:
qWarning( "Unknown authentication scheme, 0x%08lx", scheme );
currentState = Error;
break;
};
}
void KRFBLogin::gotChallenge()
{
disconnect( con, SIGNAL( gotEnoughData() ),
this, SLOT( gotChallenge() ) );
QTimer::singleShot( 0, this, SLOT(getPassword()) );
}
void KRFBLogin::getPassword()
{
// Got data
CARD8 challenge[ ChallengeLength ];
con->read( challenge, ChallengeLength );
// Last chance to enter a password
if ( con->pass_.isNull() ) {
qWarning( "krfblogin needs a password" );
emit passwordRequired( con );
}
if ( con->pass_.isNull() ) {
QString msg = tr( "Error: This server requires a password, but none "
"has been specified.\n" );
emit error( msg );
return;
}
vncEncryptBytes( (unsigned char *) challenge, con->pass_.data() );
con->write( challenge, ChallengeLength );
connect( con, SIGNAL( gotEnoughData() ), SLOT( gotAuthResult() ) );
con->waitForData( AuthResultLength );
}
void KRFBLogin::gotFailureReasonSize()
{
disconnect( con, SIGNAL( gotEnoughData() ), this,
SLOT( gotFailureReasonSize() ) );
}
void KRFBLogin::gotAuthResult()
{
// Got data
disconnect( con, SIGNAL( gotEnoughData() ), this,
SLOT( gotAuthResult() ) );
long result;
con->read( &result, AuthResultLength );
result = Swap32IfLE( result );
qWarning( "Authentication Result is 0x%08lx", result );
static QString failed = tr( "Error: The password you specified was incorrect." );
static QString tooMany = tr( "Error: Too many invalid login attempts have been made\n"
"to this account, please try later." );
static QString statusMsgOk = tr( "Logged in" );
static QString statusMsgFailed = tr( "Login Failed" );
static QString statusMsgTooMany = tr( "Too many failures" );
switch( result ) {
case AuthOk:
emit status( statusMsgOk );
con->gotRFBConnection();
break;
case AuthFailed:
qWarning( "Dammit" );
emit status( statusMsgFailed );
emit error( failed );
break;
case AuthTooMany:
emit status( statusMsgTooMany );
emit error( tooMany );
break;
default:
qWarning( "Invalid authentication result, %lx", result );
break;
}
}
void KRFBLogin::sendClientVersion()
{
qWarning( "Sending client version" );
con->write( (void*)"RFB 003.003\n", ClientVersionLength );
}
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