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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
#
# Tested on OpenBSD and OpenSUSE.
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
if [ ! -d /etc/ssh/old ]; then
mkdir /etc/ssh/old
fi
if [ -f /etc/ssh/ssh_known_hosts ]; then
mv /etc/ssh/ssh_known_hosts /etc/ssh/old/
fi
#if compgen -G "/etc/ssh/ssh_host_*" > /dev/null; then
#mv /etc/ssh/ssh_host_* /etc/ssh/old/
#fi
if [ -f /etc/ssh/ssh_host_rsa_key ]; then
mv /etc/ssh/ssh_host_* /etc/ssh/old/
fi
mv /etc/ssh/sshd_config /etc/ssh/old/
if [ -f /etc/ssh/ssh_config ]; then
mv /etc/ssh/ssh_config /etc/ssh/old/
fi
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
sed -i -e "s/%%IP_ADDRESS%%/$IP_ADDRESS/" -e "s/%%HOSTNAME%%/$HOSTNAME/" /etc/ssh/sshd_config
cat <<'EOF_USER_CA' >/etc/ssh/user_ca
ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIOLbLqHWXcxLGf58aJwa4eSC3KYGfdIiluKynOXS/fZD root@philia.rigel.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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