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#!/bin/sh
#
# Deploys SSH client configuration for nodes with CA signed host certificates and CA based user authentication. Standalone nodes may not use this script.
# Currently only designed for systemd based GNU/Linux distributions and OpenBSD. To-Do: support Sys-V init and Lukem RC based systems.
#
# Author: Georg Pfuetzenreuter <georg@lysergic.dev>
# Last edit: 04/12/2021
#
# Not ready for production use.
get_ip_address () {
case $KERNEL in
"OpenBSD" ) ifconfig | grep -E 'inet.[0-9]' | grep -v '127.0.0.1' | awk '{ print $2}' | head -n1
;;
"Linux" ) ip addr show eth0 | awk '$1 == "inet" {gsub(/\/.*$/, "", $2); print $2}'
;;
esac
}
HOSTNAME=$(hostname -s)
KERNEL=$(uname)
IP_ADDRESS="$(get_ip_address)"
if [ "$KERNEL" = "OpenBSD" ] || [ "$KERNEL" = "Linux" ]; then
if [ -f /tmp/$HOSTNAME ] && [ -f /tmp/$HOSTNAME-cert.pub ]; then
mkdir /etc/ssh/old
[ -f /etc/ssh/ssh_known_hosts ] && mv /etc/ssh/ssh_known_hosts/ /etc/ssh/old/
if compgen -G "/etc/ssh/ssh_host_*" > /dev/null; then
mv /etc/ssh/ssh_host_* /etc/ssh/old/
fi
mv /etc/ssh/sshd_config /etc/ssh/old/
[ -f /etc/ssh/ssh_config ] && mv /etc/ssh/old/
mv /tmp/$HOSTNAME /etc/ssh/
mv /tmp/$HOSTNAME-cert.pub /etc/ssh/
cat <<'EOF_SSHD_CONFIG' >/etc/ssh/sshd_config
ListenAddress $IP_ADDRESS
Protocol 2
SyslogFacility AUTH
LogLevel FATAL
HostKey /etc/ssh/$HOSTNAME
HostCertificate /etc/ssh/$HOSTNAME-cert.pub
TrustedUserCAKeys /etc/ssh/user_ca
PasswordAuthentication no
ChallengeResponseAuthentication no
AuthenticationMethods publickey
LoginGraceTime 1m
PermitRootLogin no
StrictModes yes
MaxAuthTries 1
MaxSessions 3
X11Forwarding no
PrintMotd yes
PrintLastLog yes
EOF_SSHD_CONFIG
cat <<'EOF_USER_CA' >/etc/ssh/user_ca
ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIOLbLqHWXcxLGf58aJwa4eSC3KYGfdIiluKynOXS/fZD system@lysergic.dev
EOF_USER_CA
case $KERNEL in
"OpenBSD" ) rcctl reload sshd
;;
"Linux" ) systemctl reload sshd
;;
esac
echo "OK"
else
echo "Missing host certificate and public key, copy them to /tmp/ for me."
fi
else
echo "Unsupported operating system, please configure sshd manually."
fi
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