tacshell is a drop-in replacement for sdshell, the functionality used with RSA’s ACE/Server. It uses the TACACS+ protocol for authentication.
You can download it from the following link: https://packetstormsecurity.com/files/download/33442/tacshell-0.91.tar.gz
Source: https://packetstormsecurity.com/files/33442/tacshell-0.91.tar.gz.html

