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143 lines
2.7 KiB
143 lines
2.7 KiB
#!/bin/sh
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#
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# ssl_vncviewer: wrapper for vncviewer to use stunnel SSL tunnel.
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#
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# You must have stunnel(8) installed on the system and in your
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# PATH (n.b. stunnel is usually in an sbin subdir).
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#
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# You should have "x11vnc -ssl ..." or "x11vnc -stunnel ..."
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# running as the VNC server.
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#
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# usage: ssl_vncviewer [cert-args] host:display <vncviewer-args>
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#
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# e.g.: ssl_vncviewer snoopy:0
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# ssl_vncviewer snoopy:0 -encodings "copyrect tight zrle hextile"
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#
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# [cert-args] can be:
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# -verify /path/to/cacert.pem
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# -mycert /path/to/mycert.pem
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#
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# -verify specifies a CA cert PEM file (or a self-signed one) for
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# authenticating the VNC server.
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#
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# -mycert specifies this client's cert+key PEM file for the VNC server to
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# authenticate this client.
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#
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VNCVIEWERCMD="vncviewer"
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PATH=$PATH:/usr/sbin:/usr/local/sbin:/dist/sbin; export PATH
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help() {
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head -26 $0 | tail +2
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}
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# grab our cmdline options:
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while [ "X$1" != "X" ]
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do
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case $1 in
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"-verify") shift; verify="$1"
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;;
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"-mycert") shift; mycert="$1"
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;;
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"-h"*) help; exit 0
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;;
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*) break
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;;
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esac
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shift
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done
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orig="$1"
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shift
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# play around with host:display port:
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if ! echo "$orig" | grep ':' > /dev/null; then
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orig="$orig:0"
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fi
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host=`echo "$orig" | awk -F: '{print $1}'`
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disp=`echo "$orig" | awk -F: '{print $2}'`
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if [ $disp -lt 200 ]; then
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port=`expr $disp + 5900`
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fi
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# try to find an open listening port via netstat(1):
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use=""
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if uname | grep Linux > /dev/null; then
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inuse=`netstat -ant | grep LISTEN | awk '{print $4}' | sed 's/^.*://'`
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try=5920
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while [ $try -lt 6000 ]
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do
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if ! echo "$inuse" | grep -w $try > /dev/null; then
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use=$try
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break
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fi
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try=`expr $try + 1`
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done
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fi
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if [ "X$use" = "X" ]; then
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# otherwise choose a "random" one:
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use=`date +%S`
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use=`expr $use + 5920`
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fi
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# create the stunnel config file:
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if [ "X$verify" != "X" ]; then
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if [ -d $verify ]; then
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verify="CApath = $verify"
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else
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verify="CAfile = $verify"
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fi
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verify="$verify
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verify = 2"
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fi
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if [ "X$mycert" != "X" ]; then
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cert="cert = $mycert"
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fi
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##debug = 7
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tmp=/tmp/ssl_vncviewer.$$
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cat > $tmp <<END
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foreground = yes
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pid =
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client = yes
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$verify
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$cert
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[vnc_stunnel]
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accept = $use
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connect= $host:$port
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END
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echo ""
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echo "Using this stunnel configuration:"
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cat $tmp
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echo ""
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sleep 1
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echo "running: stunnel $tmp"
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stunnel $tmp < /dev/tty > /dev/tty &
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pid=$!
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echo ""
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# pause here to let the user supply a possible passphrase for the
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# mycert key:
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if [ "X$mycert" != "X" ]; then
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sleep 4
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fi
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sleep 2
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rm -f $tmp
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if [ $use -ge 5900 ]; then
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n=`expr $use - 5900`
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fi
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if echo "$0" | grep vncip > /dev/null; then
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# hack for runge's special wrapper script vncip.
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vncip "$@" localhost:$n
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else
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$VNCVIEWERCMD "$@" localhost:$n
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fi
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kill $pid
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