born2beroot

Installing a fresh system, and the comands needed for a sucessfull evaluation.

passwords

root:       w9ayessdMb
user:       Gizch6vBV0
partition:  H9dm21AMo9piJHDBZF01

ssh

check ssh and login from another terminal

$ sudo service ssh status
.. # or
$ sudo systemctl status ssh
.. # to log in
$ ssh [email protected] -p 4242
..
$ logout

ssh ports are defined in /etc/ssh/sshd_config

sudo nano /etc/ssh/sshd_config
.. # check change with grep
sudo grep  Port /etc/ssh/sshd_config

ufw

check ufw firewall status

$ sudo ufw status numbered
# will give
active

     To                         Action      From
     --                         ------      ----
[ 1] 4242                       ALLOW IN    Anywhere
[ 2] 22/tcp (v6)                ALLOW IN    Anywhere (v6)
[ 3] 4242 (v6)                  ALLOW IN    Anywhere (v6)
.. # add rule new rule 
$ sudo ufw allow <4242>
.. # delete rule
$ sudo ufw delete <2 to remove the 22 rule>

sudo

$ su -
$ suermod -aG sudo <username>
$ groups <username>

super suser privilages su -

$ sudo visudo

add the line following line to the file

<username> ALL=(ALL) ALL

new user and group

creat a new user

$ sudo adduser <username>             # add new user
..
$ sudo chage -l <username>            # check password status
..
$ sudo adduser <username> <groupname> # add user to group
..
$ sudo deluser <username>

To creat a new user group and add userto it

$ sudo addgroup <groupname>           # make a new group
.. 
$ sudo adduser <username> <groupname> #add user to group
.. 
$ getent group <groupname>            #check users in group

to check all the current users

$ cut -d: -f1 /etc/passwd

check user password status

$ chage -l <username>

tty

tty is a service that means a script can't upgrade it's privilages by running sudo. logged sudo actions are saved in /var/log/sudo/sudo.log

crontab

used to schdule things

$ sudo crontab -u root -e             # setup a cron job with
.. 
$ sudo crontab -u root -l             # to show the currect crontab tasts to run
# in this format 
# m h  dom mon dow   command 
# do* == day of, month / week

monitoring script

This is a script that is run every 10 mins and displays some informatiom about the system.

$ sudo nano /usr/local/bin/monitoring.sh
..
$ sudo bash /usr/local/bin/monitoring.sh

ftp as additinal service

a service to transfer files

sudo service vsftpd status

evaluation

$ sudo nano /etc/hostname
# sudo logs in
$ cd /var/log/sudo