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libtdevnc/classes/ssl/ssl_vncviewer

344 lines
6.9 KiB

#!/bin/sh
#
# ssl_vncviewer: wrapper for vncviewer to use an stunnel SSL tunnel.
#
# Copyright (c) 2006 by Karl J. Runge <runge@karlrunge.com>
#
# You must have stunnel(8) installed on the system and in your
# PATH (n.b. stunnel is usually in an sbin subdir).
#
# You should have "x11vnc -ssl ..." or "x11vnc -stunnel ..."
# running as the VNC server.
#
# usage: ssl_vncviewer [cert-args] host:display <vncviewer-args>
#
# e.g.: ssl_vncviewer snoopy:0
# ssl_vncviewer snoopy:0 -encodings "copyrect tight zrle hextile"
#
# [cert-args] can be:
# -verify /path/to/cacert.pem
# -mycert /path/to/mycert.pem
# -proxy host:port
#
# -verify specifies a CA cert PEM file (or a self-signed one) for
# authenticating the VNC server.
#
# -mycert specifies this client's cert+key PEM file for the VNC server to
# authenticate this client.
#
# -proxy try host:port as a Web proxy to use the CONNECT method
# to reach the VNC server (e.g. your firewall requires a proxy).
# For the "double proxy" case use -proxy host1:port1,host2:port2
#
# A couple other args (not related to certs):
#
# -alpha turn on cursor alphablending hack if you are using the
# enhanced tightvnc vncviewer.
#
# -grab turn on XGrabServer hack if you are using the enhanced tightvnc
# vncviewer (e.g. for fullscreen mode in some windowmanagers like
# fvwm that do not otherwise work in fullscreen mode)
#
#
# set VNCVIEWERCMD to whatever vncviewer command you want to use:
#
VNCIPCMD=${VNCVIEWERCMD:-vncip}
VNCVIEWERCMD=${VNCVIEWERCMD:-vncviewer}
#
# Same for STUNNEL, e.g. /path/to/stunnel or stunnel4, etc.
#
PATH=$PATH:/usr/sbin:/usr/local/sbin:/dist/sbin; export PATH
if [ "X$STUNNEL" = "X" ]; then
type stunnel4 > /dev/null 2>&1
if [ $? = 0 ]; then
STUNNEL=stunnel4
else
STUNNEL=stunnel
fi
fi
help() {
head -39 $0 | tail +2
}
gotalpha=""
# grab our cmdline options:
while [ "X$1" != "X" ]
do
case $1 in
"-verify") shift; verify="$1"
;;
"-mycert") shift; mycert="$1"
;;
"-proxy") shift; proxy="$1"
;;
"-alpha") gotalpha=1
;;
"-grab") VNCVIEWER_GRAB_SERVER=1; export VNCVIEWER_GRAB_SERVER
;;
"-h"*) help; exit 0
;;
*) break
;;
esac
shift
done
if [ "X$gotalpha" != "X1" ]; then
NO_ALPHABLEND=1
export NO_ALPHABLEND
fi
orig="$1"
shift
# play around with host:display port:
if echo "$orig" | grep ':' > /dev/null; then
:
else
orig="$orig:0"
fi
host=`echo "$orig" | awk -F: '{print $1}'`
disp=`echo "$orig" | awk -F: '{print $2}'`
if [ "X$host" = "X" ]; then
host=localhost
fi
if [ $disp -lt 200 ]; then
port=`expr $disp + 5900`
else
port=$disp
fi
# try to find an open listening port via netstat(1):
use=""
inuse=""
if uname | grep Linux > /dev/null; then
inuse=`netstat -ant | grep LISTEN | awk '{print $4}' | sed 's/^.*://'`
elif uname | grep SunOS > /dev/null; then
inuse=`netstat -an -f inet -P tcp | grep LISTEN | awk '{print $1}' | sed 's/^.*\.//'`
fi
if [ "x$inuse" != "x" ]; then
try=5930
while [ $try -lt 6000 ]
do
if echo "$inuse" | grep -w $try > /dev/null; then
:
else
use=$try
break
fi
try=`expr $try + 1`
done
fi
if [ "X$use" = "X" ]; then
# otherwise choose a "random" one:
use=`date +%S`
use=`expr $use + 5930`
fi
# create the stunnel config file:
if [ "X$verify" != "X" ]; then
if [ -d $verify ]; then
verify="CApath = $verify"
else
verify="CAfile = $verify"
fi
verify="$verify
verify = 2"
fi
if [ "X$mycert" != "X" ]; then
cert="cert = $mycert"
fi
pcode() {
tf=$1
SSL_VNC_PROXY=$proxy; export SSL_VNC_PROXY
SSL_VNC_DEST="$host:$port"; export SSL_VNC_DEST
cod='#!/usr/bin/perl
# A hack to glue stunnel to a Web proxy for client connections.
use IO::Socket::INET;
my ($first, $second) = split(/,/, $ENV{SSL_VNC_PROXY});
my ($proxy_host, $proxy_port) = split(/:/, $first);
my $connect = $ENV{SSL_VNC_DEST};
print STDERR "\nperl script for web proxing:\n";
print STDERR "proxy_host: $proxy_host\n";
print STDERR "proxy_port: $proxy_port\n";
print STDERR "proxy_connect: $connect\n";
my $sock = IO::Socket::INET->new(
PeerAddr => $proxy_host,
PeerPort => $proxy_port,
Proto => "tcp");
if (! $sock) {
unlink($0);
die "perl proxy: $!\n";
}
my $con = "";
if ($second ne "") {
$con = "CONNECT $second HTTP/1.1\r\n";
$con .= "Host: $second\r\n\r\n";
} else {
$con = "CONNECT $connect HTTP/1.1\r\n";
$con .= "Host: $connect\r\n\r\n";
}
print STDERR "proxy_request1:\n$con";
print $sock $con;
unlink($0);
my $rep = "";
while ($rep !~ /\r\n\r\n/) {
my $c = getc($sock);
print STDERR $c;
$rep .= $c;
}
if ($rep !~ m,HTTP/.* 200,) {
die "proxy error: $rep\n";
}
if ($second ne "") {
$con = "CONNECT $connect HTTP/1.1\r\n";
$con .= "Host: $connect\r\n\r\n";
print STDERR "proxy_request2:\n$con";
print $sock $con;
$rep = "";
while ($rep !~ /\r\n\r\n/) {
my $c = getc($sock);
print STDERR $c;
$rep .= $c;
}
if ($rep !~ m,HTTP/.* 200,) {
die "proxy error: $rep\n";
}
}
if (fork) {
print STDERR "parent\[$$] STDIN -> socket\n\n";
xfer(STDIN, $sock);
} else {
print STDERR "child \[$$] socket -> STDOUT\n\n";
xfer($sock, STDOUT);
}
exit;
sub xfer {
my($in, $out) = @_;
$RIN = $WIN = $EIN = "";
$ROUT = "";
vec($RIN, fileno($in), 1) = 1;
vec($WIN, fileno($in), 1) = 1;
$EIN = $RIN | $WIN;
while (1) {
my $nf = 0;
while (! $nf) {
$nf = select($ROUT=$RIN, undef, undef, undef);
}
my $len = sysread($in, $buf, 8192);
if (! defined($len)) {
next if $! =~ /^Interrupted/;
print STDERR "perl proxy\[$$]: $!\n";
last;
} elsif ($len == 0) {
print STDERR "perl proxy\[$$]: Input is EOF.\n";
last;
}
my $offset = 0;
my $quit = 0;
while ($len) {
my $written = syswrite($out, $buf, $len, $offset);
if (! defined $written) {
print STDERR "perl proxy\[$$]: Output is EOF. $!\n";
$quit = 1;
last;
}
$len -= $written;
$offset += $written;
}
last if $quit;
}
close($in);
close($out);
}
'
rm -f $tf
if [ -f $tf ]; then
echo "$tf still exists!"
exit 1
fi
echo "$cod" > $tf
chmod 700 $tf
}
ptmp=""
if [ "X$proxy" != "X" ]; then
ptmp="/tmp/ssl_vncviewer.$$.pl"
pcode $ptmp
connect="exec = $ptmp"
else
connect="connect = $host:$port"
fi
##debug = 7
tmp=/tmp/ssl_vncviewer.$$
cat > $tmp <<END
foreground = yes
pid =
client = yes
debug = 6
$verify
$cert
[vnc_stunnel]
accept = $use
$connect
END
echo ""
echo "Using this stunnel configuration:"
echo ""
cat $tmp | uniq
echo ""
sleep 1
echo "running: $STUNNEL $tmp"
$STUNNEL $tmp < /dev/tty > /dev/tty &
pid=$!
echo ""
# pause here to let the user supply a possible passphrase for the
# mycert key:
if [ "X$mycert" != "X" ]; then
sleep 4
fi
sleep 2
rm -f $tmp
if [ $use -ge 5900 ]; then
n=`expr $use - 5900`
fi
if echo "$0" | grep vncip > /dev/null; then
# hack for runge's special wrapper script vncip.
$VNCIPCMD "$@" localhost:$n
else
$VNCVIEWERCMD "$@" localhost:$n
fi
kill $pid
sleep 1