1 files changed, 79 insertions, 0 deletions
diff --git a/ansible/deployment_poc/shell/configure_sshd.sh b/ansible/deployment_poc/shell/configure_sshd.sh
new file mode 100755
index 0000000..2cf3ac4
--- /dev/null
+++ b/ansible/deployment_poc/shell/configure_sshd.sh
@@ -0,0 +1,79 @@
+#!/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. To-Do 2: port this to Ansible deployment_poc.
+#
+# Author: Georg Pfuetzenreuter <georg@lysergic.dev>
+# Last edit: 13/02/2022
+
+PUBKEY="$1"
+
+
+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 /etc/ssh/$HOSTNAME ] && [ -f /etc/ssh/$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
+		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
+		echo "$PUBKEY" > /etc/ssh/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 /etc/ssh/ for me."
+	fi
+else
+	echo "Unsupported operating system, please configure sshd manually."
+fi