[Update]: It's close now.
This is a rebuilt puzzle originated from Boston Key Party CTF 2017 - vimjail.
Write up is here: https://yous.be/2017/03/01/boston-key-party-ctf-2017-vimjail-write-up/
ssh email@example.com -p22 (vimjail)
All the files you need are right in the ~ directory (i mean except those normal command binary files).
If you have any comment or question, pls leave me a message here.