2017-03-28 09:58:13 +02:00
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<P ALIGN=CENTER STYLE="margin-bottom: 0cm"><FONT SIZE=4 STYLE="font-size: 16pt"><U><B>VNC
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over STUNNEL with a Linux server and Windows 2000 client HOWTO</B></U></FONT></P>
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<P ALIGN=CENTER STYLE="margin-bottom: 0cm"><BR>
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</P>
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<P STYLE="margin-bottom: 0cm">19 February 2001</P>
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<P STYLE="margin-bottom: 0cm">ver 1.0</P>
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<P STYLE="margin-bottom: 0cm">by Craig Furter and Arno van der Walt</P>
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<P STYLE="margin-bottom: 0cm">contact us at <A HREF="mailto:cfurter@vexen.co.za">cfurter@vexen.co.za</A>
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and <A HREF="mailto:arnovdw@mycomax.com">arnovdw@mycomax.com</A></P>
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<P STYLE="margin-bottom: 0cm"><BR>
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</P>
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<P STYLE="margin-bottom: 0cm"><BR>
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</P>
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<P STYLE="margin-bottom: 0cm">We assume that you have already
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downloaded VNCServer and VNCViewer.</P>
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<P STYLE="margin-bottom: 0cm"><BR>
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</P>
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<P STYLE="margin-bottom: 0cm">First of all there is a step by step
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HOWTO and then we'll look at the theory behind all this.</P>
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<P STYLE="margin-bottom: 0cm"><BR>
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</P>
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<OL>
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2017-11-15 15:03:25 +01:00
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<LI><P STYLE="margin-bottom: 0cm">Download and install OpenSSL,
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SSLeay, and Stunnel on the Linux/Unix box. Download the modules.</P>
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</OL>
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<P STYLE="margin-left: 0.5cm; margin-bottom: 0cm">a)
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[root@anthrax$]gunzip openssl-x.xx.tar.gz (repeat for all 3 the
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modules)</P>
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<P STYLE="margin-left: 0.5cm; margin-bottom: 0cm">b)
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[root@anthrax$]tar – xvf openssl-x.xx.tar (repeat for all 3 the
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modules)</P>
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<P STYLE="margin-left: 0.5cm; margin-bottom: 0cm"><BR>
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</P>
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<OL>
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<LI><P STYLE="margin-bottom: 0cm">Copy the following to Notepad and
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save the file as VNCRegEdit.REG on the Windows 2000 box</P>
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</OL>
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<P STYLE="margin-left: 0.5cm; margin-bottom: 0cm">--cut here and copy
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to VNCRegEdit.REG then double click the file to
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import--<BR>REGEDIT4<BR><BR>[HKEY_LOCAL_MACHINE\Software\ORL\WinVNC3]<BR>AllowLoopback=dword:00000001<BR><BR>[HKEY_LOCAL_MACHINE\Software\ORL\WinVNC3\Default]<BR>AllowLoopback=dword:00000001<BR>--stop
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here--<BR><BR>
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</P>
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<P STYLE="margin-left: 0.5cm; margin-bottom: 0cm"><BR>
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</P>
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<OL>
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<LI><P STYLE="margin-bottom: 0cm">Install Stunnel on the Windows
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2000 machine by copying the following files to your \WINNT\SYSTEM32\
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directory</P>
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</OL>
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<P STYLE="margin-left: 0.5cm; margin-bottom: 0cm">a)libeay32.dll</P>
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<P STYLE="margin-left: 0.5cm; margin-bottom: 0cm">b)libssl.dll</P>
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<P STYLE="margin-left: 0.5cm; margin-bottom: 0cm">c)stunnel.pem</P>
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<P STYLE="margin-left: 0.5cm; margin-bottom: 0cm"><BR>
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</P>
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<OL>
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<LI><P STYLE="margin-bottom: 0cm">On the Linux box execute the
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following command as root and let it run in its own terminal.</P>
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</OL>
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<P STYLE="margin-left: 0.5cm; margin-bottom: 0cm">./stunnel -d 5900
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-r 5901</P>
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<P STYLE="margin-left: 0.5cm; margin-bottom: 0cm"><BR>
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</P>
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<OL>
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<LI><P STYLE="margin-bottom: 0cm">Execute vncserver (it should run
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as display:1 when you execute the ps aux |grep vnc command)</P>
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</OL>
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<P STYLE="margin-left: 0.5cm; margin-bottom: 0cm"><BR>
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</P>
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<OL>
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<LI><P STYLE="margin-bottom: 0cm">Now on the Windows 2000 machine
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execute the following command and let it run in its own terminal.</P>
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</OL>
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<P STYLE="margin-left: 0.5cm; margin-bottom: 0cm">stunnel -d 5900 -r
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unix.ip.address:5900 -c</P>
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<P STYLE="margin-left: 0.5cm; margin-bottom: 0cm">.</P>
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<OL>
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<LI><P STYLE="margin-bottom: 0cm">And on the Windows 2000 machine
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open VNCviewer and connect to localhost specifying no display</P>
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</OL>
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<P STYLE="margin-left: 0.5cm; margin-bottom: 0cm">ie. 10.10.1.53 in
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the window</P>
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<P STYLE="margin-left: 0.5cm; margin-bottom: 0cm"><BR>
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</P>
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<OL>
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<LI><P STYLE="margin-bottom: 0cm">For each additional display repeat
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steps 4 – 6 and increment the specified ports with 2 ie. The
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Linux command will look as follows:</P>
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</OL>
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<P STYLE="margin-left: 0.5cm; margin-bottom: 0cm"> ./stunnel -d 5902
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-r 5903
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</P>
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<P STYLE="margin-left: 0.5cm; margin-bottom: 0cm">and the Windows
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2000 command as follows:
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</P>
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<P STYLE="margin-left: 0.5cm; margin-bottom: 0cm">stunnel -d 5902 -r
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unix.ip.address:5902</P>
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<P STYLE="margin-left: 0.5cm; margin-bottom: 0cm">and remember to
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start another vncserver on the Linux box for each VNC display</P>
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<P STYLE="margin-bottom: 0cm"><BR>
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</P>
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<P STYLE="margin-bottom: 0cm"><BR>
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</P>
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<OL>
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<LI><P STYLE="margin-bottom: 0cm">The display number on the
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vncviewer must also be incremented with two ie:</P>
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</OL>
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<P STYLE="margin-left: 0.5cm; margin-bottom: 0cm">10.10.1.53:2 etc.</P>
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<P STYLE="margin-bottom: 0cm"><BR>
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</P>
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<P STYLE="margin-bottom: 0cm"><FONT SIZE=4><U>The THEORY</U></FONT></P>
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<P STYLE="margin-bottom: 0cm"><BR>
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</P>
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<P STYLE="margin-bottom: 0cm"><U>Tunneling:</U></P>
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<P STYLE="margin-bottom: 0cm"><BR>
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</P>
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<P STYLE="margin-bottom: 0cm">What this means is that software
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(daemon) runs on the client and server machine. In this case, the
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Windows 2000 machine is the client and the server is the *NIX
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machine. Stunnel will then run as client on Windows 2000 and server
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mode on the UNIX box.<BR><BR>eg:<BR>Windows:<BR>stunnel -d 5900 -r
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unix.ip.address:5900 -c<BR><BR>UNIX<BR>stunnel -d 5900 -r 5901<BR><BR>This
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means that connecting to VNC display 0 in the localhost will transfer
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all the calls to the *NIX machine on display 1. So the VNC server on
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the *NIX machine must be running on display 1. Not display 0. If you
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run stunnel before VNC, VNC will automatically move to display 1
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noticing that port 5900 ("display" 0) is already in
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use).<BR><BR>What happens now is that when you connect to port 5900
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on the Windows machine via an "unsecured" connection, a
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secure "tunnel" is opened from Windows 2000 to the *NIX
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machine on port 5900. The *NIX machine then opens a "unsecured"
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connection to itself on port 5901. We now have a secure tunnel
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available.</P>
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<P STYLE="margin-bottom: 0cm"><BR>
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</P>
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<P STYLE="margin-bottom: 0cm"><U>A bit about VNC and displays</U></P>
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<P STYLE="margin-bottom: 0cm"><BR>
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</P>
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<P STYLE="margin-bottom: 0cm">The -d is the listening IPaddress:port
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and the -r is the remote IPaddress:port. VNC uses port 5900 for
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display 0. That means that display 1 will be 5901. If you want VNC
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server to listen for a connection on port 80 then the display number
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will be 80 - 5900 = -5820. If you want VNC server to<BR>listen on
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port 14000 then the display number is 14000 - 5900 = 8100.<BR><BR>So
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all you have to do is run stunnel on the UNIX machine and VNC on the
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desired "display" number.</P>
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<P STYLE="margin-bottom: 0cm"><BR>
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</P>
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<P STYLE="margin-bottom: 0cm"><U>VNC on the Windows 2000 machine</U></P>
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<P STYLE="margin-bottom: 0cm"><BR>
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</P>
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<P STYLE="margin-bottom: 0cm">To connect from the client machine you
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need to enter the client machine's IP address and the "display"
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(from the port conversion). But VNC will think that you are trying to
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connect to the local machine and does not allow this. To override
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this add the following to your registry.<BR><BR>--cut here and copy to
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anything.reg. then double click the file to
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import--<BR>REGEDIT4<BR><BR>[HKEY_LOCAL_MACHINE\Software\ORL\WinVNC3]<BR>AllowLoopback=dword:00000001<BR><BR>[HKEY_LOCAL_MACHINE\Software\ORL\WinVNC3\Default]<BR>AllowLoopback=dword:00000001<BR>--stop
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here--<BR><BR>Now VNC will not complain. So you need to always run
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stunnel in client mode on the Windows machine and then connect with
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VNCViewer to the localhost on the correct "display". By the
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way, *NIX doesn't complain about this. There is no setting needed if
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*NIX to *NIX.</P>
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<P STYLE="margin-bottom: 0cm"><BR>
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</P>
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<P STYLE="margin-bottom: 0cm"><U>VNC's Java client</U></P>
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<P STYLE="margin-bottom: 0cm"><BR>
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</P>
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<P STYLE="margin-bottom: 0cm">Unfortunately this will not work well
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with the built-in web version. If you did not known about it, try
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http'ing into a machine running VNC server on it, to port 58XX (where
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XX is the display number), and the Java client will be loaded.<BR><BR>
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</P>
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