Locked myself out of SSH with UFW in EC2 AWS

Question

I have an EC2 Instance with Ubuntu. I used sudo ufw enable and after only allow the mongodb port

sudo ufw allow 27017

When th

Answer 1

Here's a little more extended version of the user-data-script thing:

Content-Type: multipart/mixed; boundary="//"
MIME-Version: 1.0

--//
Content-Type: text/cloud-config; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment; filename="cloud-config.txt"

#cloud-config
cloud_final_modules:
- [scripts-user, always]

--//
Content-Type: text/x-shellscript; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment; filename="userdata.txt"

#!/bin/bash
set -x
USERNAME="ubuntu"
ls -Al
ls -Al /home
ls -Al /home/${USERNAME}
ls -Al /home/${USERNAME}/.ssh
sudo cat /home/${USERNAME}/.ssh/authorized_keys
ls -Al /etc/ssh
ls -ld /etc/ssh

sudo grep -vE '^$|^#' /etc/hosts.*
sudo sed -i -e 's/^\([^#].*\)/# \1/g' /etc/hosts.deny
sudo sed -i -e 's/^\([^#].*\)/# \1/g' /etc/hosts.allow
sudo grep -vE '^$|^#' /etc/hosts.*
sed '/^$\|^#/d' /etc/ssh/sshd_config

chown -v root:root /home
chmod -v 755 /home
chown -v ${USERNAME}:${USERNAME} /home/${USERNAME} -R
chmod -v 700 /home/${USERNAME}
chmod -v 700 /home/${USERNAME}/.ssh
chmod -v 600 /home/${USERNAME}/.ssh/authorized_keys

sudo tail /var/log/auth.log
sudo ufw status numbered
sudo ufw disable
sudo iptables -F
sudo service iptables stop
sudo service sshd restart
sudo service sshd status -l
--//