Esther codes

  1. Hardened OpenVPN server on Debian

    Preliminaries This tutorial is inspired by the Linode documentation. First of all, we have to install the OpenVPN package and some extra tools. sudo apt update sudo apt upgrade sudo apt install -y iptables-persistent openvpn easy-rsa echo 1 > /proc/sys/net/ipv4/ip_forward Edit vim /etc/sysctl.conf…

  2. Snippets in Go

    Check if an e-mail address is valid With net/mail. func validateEmailAddress(email string) bool { _, err := mail.ParseAddress(email) if err != nil { return false } return true } Generate UUID according to RFC 4122 With crypto/rand. func NewUUID() (string, error) { uuid := make([]byte, 16) n, err := io.ReadFull(rand.Reader, uuid)…

  3. Encrypt root partition of Raspberry Pi

    Preliminaries - On your Raspberry This tutorial was tested on Raspbian Pixel Lite (2017). Remove shitty things sudo apt-get -y purge plymouth Create your initramfs sudo apt-get install busybox cryptsetup ntp dropbear dd if=/dev/zero of=/tmp/fakeroot.img bs=1M count=20 cryptsetup luksFormat /tmp/fakeroot.img sudo…