Today I installed Kali Linux on my Raspberry Pi to tackel a reverse engineering book that has been collecting dust at home for some time now.

After setting up SSH access via the Pi GUI, I wondered how to control existing shells by using an SSH session.

Kill local shell from remote shell

┌──(kali㉿kali-raspberry-pi)-[~]
└─$ ps -aux | egrep "zsh|qt"    // find correct pts (pseudo terminal slave)
kali        1174  0.5  9.8 411164 91908 ?        Sl   11:27   0:05 /usr/bin/qterminal
kali        1232  0.5  0.7  13612  6860 pts/0    Ss+  11:27   0:05 /usr/bin/zsh
kali        3676  0.9  0.6  10284  5900 pts/2    Ss   11:36   0:05 -zsh
kali        6402  0.0  0.2   6076  1936 pts/2    R+   11:46   0:00 grep -E --color=auto zsh|qt

┌──(kali㉿kali-raspberry-pi)-[~]
└─$ sudo kill -9 1232 1174

Write to local shell from remote shell

┌──(kali㉿kali-raspberry-pi)-[~]
└─$ ps -aux | egrep "zsh|qt"
kali        1125  2.1 12.4 436656 116284 ?       Sl   10:04   0:11 /usr/bin/qterminal
kali        1190  1.0  0.6  10492  5712 pts/0    Ss+  10:04   0:05 /usr/bin/zsh
kali        2241  2.9  0.6  10388  5768 pts/1    Ss   10:08   0:09 -zsh
kali        3748  0.0  0.1   6140  1856 pts/1    S+   10:13   0:00 grep -E --color=auto zsh|qt

┌──(kali㉿kali-raspberry-pi)-[~]    // greetings from another shell
└─$ echo 'hello' > /dev/pts/0

┌──(kali㉿kali-raspberry-pi)-[~]    // send message
└─$ echo 'follow the white rabbit' > /dev/pts/0

┌──(kali㉿kali-raspberry-pi)-[~]    // go wild
└─$ cat /dev/urandom > /dev/pts/0
^C
throw randomness at shell

Capture input stream

┌──(kali㉿kali-raspberry-pi)-[~]
└─$ cat < /dev/pts/1 // makes shell unstable
OAOAtsAOAOAAOAOAAOAOAAOAOABOAOAAOAOAAOBOAAOAOAAOAOABOAOAAOBOAAOAOBAOAOABOAOABOBOAAOAOBBOAOAAOBOBAOAOABOBOAAOAOBBOAOAAOBOBAOAetC^C