[kali] ssh server setup and config

Question: 

1. how to install and enable openssh-server
2. how to auto-start sshd after reboot
3. how to be more secure for login


Instruction from:

http://www.drchaos.com/enable-ssh-on-kali-linux/
http://www.linuxproblem.org/art_9.html


Answer:

1. how to install and enable openssh-server

apt-get install openssh-server

2. how to auto-start sshd after reboot

update-rc.d -f ssh remove

update-rc.d -f ssh defaults

3. how to be more secure for login

cd /etc/ssh/
mkdir insecure_original_default_kali_keys
mv ssh_host_* insecure_original_default_kali_keys/
dpkg-reconfigure openssh-server

vi /etc/ssh/sshd_config

ssh-keygen -t rsa
cat /root/.ssh/id_rsa.pub >> /root/.ssh/authorized_keys

chmod 700 /root/.ssh

chmod 640 /root/.ssh/authorized_keys

service sshd start

# === manual steps on Windows ===

use winscp to copy /root/.ssh/id_rsa from kali VM, with username and password

use xshell to login kali VM by id_rsa file

use winscp to login kali VM by id_rsa.ppk file

use putty to login kali VM by id_rsa.ppk file

# === back to Kali shell ===

vi /etc/ssh/sshd.conf

service sshd restart

tail -f /var/log/auth.log

Conclusion

1. change password (CLI: passwd) first
2. setup ssh server
3. ssh login without password (and prohibit login with password)