AnttiTakala/SSH2DOS - Githubissues

SSH2DOS v0.2.1+SHA256.1 patch by Antti Takala https://github.com/AnttiTakala/SSH2DOS Released on 04-14-2021

The aim was to update the ciphers and protocols to more 2021 standards so the programs would be usable with current ssh servers without the need to change the server configuration to allow less secure connection methods.

Changes to original: diffie-hellman-group1-sha1 -> diffie-hellman-group14-sha256 aes128-cbc -> aes128-ctr hmac-sha1 -> hmac-sha2-256

Implementations for these have been copied from putty-0.70 source. The latest version was not used because this version was the last one compatible with the originally copied parts from earlier putty version.

Only tested the ssh and scp clients with password based authentication.

Note that the random number generator used in the program is not cryptographically secure at all. There may also be other security issues so USE AT YOUR OWN RISK.

Original readme follows:

SSH2DOS
Copyright (c) 2000-2006 Nagy Daniel
This program is distributed under the terms of the GNU General
Public License. Please read the copying file for details.

Portions:

WATT-32 library (which is based on the WATTCP library)
Copyright (c) 1990, 1991, 1992, 1993 Erick Engelke
Portions Copyright (c) 1993  Quentin Smart
Portions Copyright (c) 1991  University of Waterloo
Portions Copyright (c) 1990  National Center for Supercomputer
                 Applications
Portions Copyright (c) 1990  Clarkson University
Portions Copyright (c) 1983, 1986, Imagen Corporation
http://www.wattcp.com
http://www.bgnett.no/~giva

ZLIB library
Copyright (C) 1995-1998 Jean-loup Gailly and Mark Adler
http://www.gzip.org

PuTTY
Copyright (c) 1997-2002 Simon Tatham
PuTTY is distributed under the terms of the MIT licence.
http://www.chiark.greenend.org.uk/~sgtatham/putty/

CVT100
Copyright (c) 1988 Jerry Joplin (CVT100)
Portions copyright (c) 1981, 1988 Trustees of Columbia University
                  in the City of New York
Permission is granted to any individual or institution
to use, copy, or redistribute this program and
documentation as long as it is not sold for profit and
as long as the Columbia copyright notice is retained.
http://www.simtel.net/pub/simtelnet/msdos/commprog/cvt100.zip

INTRODUCTION ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ

SSH2DOS (SSH2D386) is an SSH client which provides a telnet-like
interactive login shell to remote hosts. It can be used to run
commands on remote hosts as well.

SFTPDOS (SFTP386) and SCPDOS (SCP2D386) are secure file transfer
utilities capable of transferring files from remote to local or
from local to remote machines.

TELNET (TEL386) is the good old telnet utility.

These programs can run on low-end machines (8086+) when
compiled as real-mode applications (OpenWatcom large model),
so it's an ideal solution to connect from el-cheapo machines
or DOS compatible PDAs.
The 386 version (OpenWatcom flat model) is much faster,
    but it requires at least a 386 machine.

Supported cipher: AES
Implemented SSH protocol version: 2.0
Supported authentication methods: keyboard-interactive,
public key and password

    All utilities support SOCKS5 and HTTP proxies with
    user authentication support. This is handy if you're
    behind a firewall.

SSH2DOS is based on the WATT-32 TCP/IP library, Putty SSH client
for Windows, the ZLIB compression library and the CVT100
terminal emulation package.

INSTALLATION ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ

Unzip the package with subdirectory support (pkunzip -d).

If you have the binary package, no installation is needed.
Edit the wattcp.cfg and hosts file first, then install a packet
driver, or set up your PPP connection if you have a modem.

    To compile the sources, you'll also need the WATT-32 and ZLIB
    sources.
To build the binaries, build ZLIB and WATT-32 first. Be sure,
    that the WATT_ROOT environment variable points to the proper
WATT-32 source directory.
Copy zlib_f.lib or zlib_l.lib (depending on your target)
to the lib\ directory under the ssh2dos source tree.
    Now run 'make -f filename', where 'filename' is needed makefile:
    watcom_l.mak - OpenWatcom real mode target (for 8086 machines)
    watcom_f.mak - OpenWatcom protected mode target (for 80386 machines)

Tested compilers:
- OpenWatcom 1.x

DOCUMENTATION ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ

To get help for SSH2DOS and SFTPDOS, please use the /? command
line option.

-i <identity file> Public key file for public key authentication.
           You can create keys with PuTTYGen or Linux
           ssh-keygen.

-t <terminal type> This string is passed to the server as the
           'TERM' environment variable. The default is
           'xterm'. You can set any string here, but be
           sure to use a correct keymap file. For the
           nicest results, I recommend 'linux' with the
           linux keymap file, if your host supports it.

-p <port number>   Port to connect to at the remote host.
           The default SSH port is 22.

-k <keymap file>   Keymap file. Three sample keymap files are
           included in the package (for vt100/102,
           linux and xterm-color terminals). The 'xterm'
           keymap is hard-wired into SSH2DOS, so keymap
           files should only contain the differences
           from the 'xterm' keymap.

-m <mode>          Video mode. Valid modes are:
           '80x25', '80x60', '132x25' and '132x50'.
           A VESA VGA card is required for extended modes.

-s <password>      You can specify your password here. This is
           useful (but INSECURE) for batch files.

-l <log file>      Log the whole session to a file.

-a <minutes>       Send keepalive packets. SSH2DOS sends IGNORE
           packets in every 'minutes'.

-b <COM[1234]>     Copy all output to a Brailab PC adapter
           connected to the specified COM port.
           This adapter is useful for the visually
           challenged.

-g         Use Diffie-Hellman group1 exchange. This may
           be useful in case of connection problems.

-P         Use a non-privileged local port.

-C         Enable compression (for real-mode SSH2DOS, you'll
           need as much free conventional memory as
           possible).

-S         Suppress status line.

-B         Use BIOS for screen writes (no direct video access).
                       This may help visually challenged people.

-V         Disable VESA BIOS. This can be useful to avoid
           changing to full-screen mode under WindowsXP
           or if you have other mode switching problems.

-n         Add CR if server sends only LF. Use this to
           prevent the 'staircase effect'.

-d         Save raw SSH packets to file 'debug.pkt'.

-v         Be more verbose at startup.

During interactive session, SHIFT + PGUP/PGDOWN can be used
to view the scrollback area.

If the connection seems to be broken and no disconnection
happens automatically, you may terminate SSH2DOS by
pressing the ALT-X key combination.

DOS shell can be invoked using the ALT-E key combination.

To use proxy support, you must set either SOCKS_PROXY or
HTTP_PROXY environment variable. The syntax is:
  [username:password@]proxyhost[:port] 
The default SOCKS port is 1080, HTTP is 3128.
Some examples:
  SOCKS5 proxy with no user authentication using default port:
    SOCKS_PROXY=proxy.foo.bar
  HTTP proxy with authentication using port 8080:
    HTTP_PROXY=myusername:mypassword@proxy.foo.bar:8080

EXAMPLESÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ

Connect to a linux box:
  ssh2dos -t linux -k linux.kbd username hostname

Connect to a host using the 386 version and compression:
  ssh2d386 -C username hostname

Connect and run a shell script called 'scriptname':
  ssh2dos username hostname nohup scriptname &

Connect to a host with sftp 386 version:
  sftp386 username@hostname
Then use the 'help' command to get help.

Copy a file from the remote host to local:
  scpdos username@hostname:path_to_remote_file local_file

Create a batch file to upload to files, "file1" and "file2",
to a remote directory called "test" on "remotehost".
This batch file "example.txt" should look like:
  open username@remotehost
  cd test
  put file1
  put file2
  bye
Now use SFTP to do the actual transfer:
  sftpdos -b example.txt

OFFICIAL SITE ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ

The official distribution site is http://sshdos.sourceforge.net

The package is available in both executable and source format. Contact: nagyd@users.sourceforge.net

AnttiTakala / SSH2DOS

readme