Secure Telnet for Windows CE 2.00:
Installation Instructions for OpenSSH
April 5, 2003
The purpose of this article is to
give a very detailed description of the installation procedure for OpenSSH
all in one place.
These instructions are for installing OpenSSH into the
Windows CE 2.00 operating system only.
The current instructions are rather terse, scattered and incomplete.
I have an
LG Phenom Express
(WinCE 2.00, SH3).
It's a neat little handheld machine with a very comfortable keyboard
and a half height, bright color display. The only problem with this machine
is LG Electronics stopped producing them in 1999! Surprisingly, this style of
machine has come back in the last few years from other vendors.
- If your WinCE machine is already connected on a local area network,
you might want to consider
setting up an ActiveSync connection over your local network
first. It's the fastest way to install programs
like OpenSSH. You also have the added bonus of being able to transfer files
over your local network.
If your WinCE machine is not connected to your local network,
you need to do this first.
I describe how to do this for my LG Phenom.
Then you may set up
an ActiveSync connection via the local network as described in the
If you don't have a local network or don't know what I'm talking about,
you can safely ignore this. :)
My main use for the LG Phenom is to type notes and be able to
access email via dialup without carrying a lot of weight.
I was looking for a way
to retrieve email from a Unix shell
in a secure fashion so I started looking for telnet programs with
SSH (Secure Shell)
capabilities. For WinCE 2.00, this is very hard to find. It appears
Microsoft has all but abandoned this operating system.
I found a free telnet,
Pocket Tera Term 0.0,
by T. Teranishi and a commercial telnet,
by Cambridge Computer Corp.
While both programs work well under WinCE 2.00,
both do not support SSH connections. This means anyone can easily monitor
your sessions and your communications are not secure. This was not desirable
Finally, I discovered there is a free telnet supporting SSH1 and SSH2 called
and is an Open Source program.
A version of OpenSSH that was ported to WinCE 2.00 by Andreas Bischoff
may be found at:
This is a great find for people like me who still use an "old"
operating system like
WinCE 2.00. :)
Andreas derived his version of OpenSSH from a version written
by Rainer Keuchel. See also:
While Andreas and Rainer did a great job with OpenSSH,
the problem is the installation instructions are rather terse,
scattered and incomplete.
(But hey, the software is free!)
The purpose of this article is to
give a more detailed description of the installation procedure for OpenSSH
all in one place.
The gist of what the instructions in the above webpages are saying:
- OpenSSH has its roots in the Unix operating system.
You need to spoof Unix directories and files on your WinCE machine
to fool OpenSSH to run.
- You do this by defining various environment variables and point them
to Unix-like directories and files you have created on the WinCE machine.
- You cannot use Microsoft's Powertoys for CE (PfCE) because there is
no registry editor in the PfCE WinCE 2.00 version.
For WinCE 2.00, you must use the CEREG.EXE program via the
- You may use the CONSOLE program to confirm that your environment
variables have been set correctly.
The installation procedure for OpenSSH is rather involved and complicated.
In fact, it's rather kludgy. But it works.
Here are the steps:
- You need to create the following directories on your WinCE machine.
Some people create these directories in a PCMCIA memory card inserted
into the WinCE machine. I just created the directories inside the
memory of my LG Phenom itself under the directory /My Handheld PC:
Point UNIXROOTDIR environment variable here.
Point PATH environment variable here.
Point TERMCAP env var here.
Point HOME env var here.
Point CELIBSTDLOGDIR env var here.
- Now you need to create or have the following files on your WinCE machine:
These are plain text files. If you are acquainted with Unix,
these directories and files should look familiar to you.
I give the contents of each file below as examples:
- My /unix/etc/passwd file contains two lines:
Note the unix directories in the above two lines must match the
directories you have defined on your WinCE machine.
These lines match the directories I have defined on my LG Phenom.
- My /unix/etc/services file contains two lines:
- The contents of the /unix/etc/termcap file is below.
You don't need to create this file. It is included with the CONSOLE program.
- My /unix/home/_console file contains three lines.
A version of this file is also included with the CONSOLE program.
pipeable rm mv ls sort grep find
- Now you need to extract the CEREG.EXE program from the
to create the environment variables on your WinCE machine.
Extract CEREG.EXE to your desktop computer.
To use CEREG.EXE, you first need to make
an ActiveSync connection between your desktop PC and the WinCE machine.
Then you run CEREG.EXE in the DOS window from your desktop PC
to define environment variables on your WinCE machine.
I have created a DOS batch file on my desktop PC which runs CEREG.EXE to create
the environment variables for my LG Phenom via the ActiveSync connection.
I list it here as an example:
cereg -k "HKLM\Environment" -n "UNIXROOTDIR" -v "\unix"
cereg -k "HKLM\Environment" -n "PATH" -v "\unix\bin;\Windows"
cereg -k "HKLM\Environment" -n "HOME" -v "\unix\home"
cereg -k "HKLM\Environment" -n "ROWS" -v "12"
cereg -k "HKLM\Environment" -n "COLS" -v "80"
cereg -k "HKLM\Environment" -n "CONSOLEFONTSIZE" -v "10"
cereg -k "HKLM\Environment" -n "TMP" -v "\Temp"
cereg -k "HKLM\Environment" -n "TEMP" -v "\Temp"
cereg -k "HKLM\Environment" -n "TMPDIR" -v "\Temp"
cereg -k "HKLM\Environment" -n "TEMPDIR" -v "\Temp"
cereg -k "HKLM\Environment" -n "USER" -v "WinCEUser"
cereg -k "HKLM\Environment" -n "TERM" -v "wince"
cereg -k "HKLM\Environment" -n "TERMCAP" -v "\unix\etc\termcap"
cereg -k "HKLM\Environment" -n "CELIBSTDLOGDIR" -v "\unix\logs"
- Install the CONSOLE program on your WinCE machine.
You may use this program to confirm the environment variables
were actually created properly.
You will also need to copy over the CELIB.DLL file to the \Windows directory
of your WinCE machine
so the CONSOLE program will run properly.
- Install OpenSSH on your WinCE machine.
As Andreas mentions, do not replace your \Windows\MSVCRT.DLL file, if one
already exists on your WinCE machine.
At this point, all you really need to do is
download OpenSSH for WinCE 2.00
and copy it over to your WinCE machine.
- Dialup your ISP (or use your favorite method to connect).
- Run the OpenSSH program.
If all goes well, OpenSSH will prompt for
and try to connect.
The first time you connect to your ISP, OpenSSH will give an authentication
error for your ISP, generate a RAS number and ask for you to continue.
Answer Yes. All subsequent connections will not do this again.
Then OpenSSH will prompt you for your shell password and you will be securely
connected to the Unix shell. You did it!
If you get any other error messages from OpenSSH,
either the Unix-like directories, the files
and/or the environment variables were not created correctly on your WinCE machine.
Go back to step 1
and review the installation procedure again.
I have observed a few bugs when running OpenSSH under WinCE 2.00.
They are minor and there are workarounds but they are annoying
- When prompted for
User:, the backspace key doesn't work properly.
This means if you make a typo, you have to restart the program all over again.
There is no workaround for this other than restarting the program.
SSH Password window does not go away after you click OK or hit the
ENTER key. It just stays there on top of the OpenSSH window and won't scroll
away. In fact, scrolling doesn't work properly either.
This would be a problem. The workaround is to make the
OpenSSH window go temporarily away,
say by going to the desktop or running another program,
and then go back to the OpenSSH window.
window goes away and the OpenSSH window now scrolls properly(!)
Seems the initial OpenSSH window is missing a repaint after the
- OpenSSH doesn't seem to check for the maximum window size on the WinCE
machine. If you give large values for the number of rows or font size,
window may not fit on the display. You may see only part of the window.
The workaround is to reduce the number of rows, columns and font size until the
entire OpenSSH window fits on your screen. See below under Fine Tuning.
- In the Unix Mail program, the backspace key, which was
mapped as ^H in the shell, is now mapped as ^? in Mail.
Also, the number 4 appears to be mapped as control-C, ^C.
This is bizarre.
There is no workaround for this.
You probably will have to play with the environment variables for the
number of rows, columns and font size to maximize the area of the telnet window.
CONSOLE's env and setenv commands
should make this easier.
You will also need to adjust the number of lines in the Unix shell via
the stty command so that it jives with the number of lines
in your OpenSSH window. This is important for shell programs like
more, pine, emacs, etc. On my LG Phenom, I set my shell screen
to 12 rows
using the command:
stty rows 12