First post, by fragmentfi
The original SSH2DOS was last updated in 2006 and the protocols and ciphers it uses are outdated and basically it does not work anymore. I've patched the program to be up to date (as of 2021).
The old programs can be still used if the ssh server configuration is changed to allow using less secure connection methods. The patched ones have been tested with the latest Ubuntu (20.04.2 LTS) release and needs to changes to ssh server configuration.
Old protocols and ciphers have been replaced as follows:
diffie-hellman-group1-sha1 -> diffie-hellman-group14-sha256
aes128-cbc -> aes128-ctr
hmac-sha1 -> hmac-sha2-256
I have only tested ssh and scp clients with password authentication. Key based authentication is most likely broken and needs some more work. Other changes to the program are minimal, the goal was just to get it working again with minimum effort.
I'm open for comments, bug reports and improvement ideas!
Source and binaries are available on GitHub: