From 1cbe132db47aaadbbc8c5a91d3d9367d19abab2c Mon Sep 17 00:00:00 2001
From: Patrick Spek <p.spek@tyil.nl>
Date: Thu, 4 Jan 2024 13:19:01 +0100
Subject: Add playbook for setting up wireguard

---
 playbooks.d/vpn-wireguard/description.txt |  1 +
 playbooks.d/vpn-wireguard/etc/defaults    |  1 +
 playbooks.d/vpn-wireguard/playbook.bash   | 84 +++++++++++++++++++++++++++++++
 playbooks.d/vpn-wireguard/share/interface |  4 ++
 playbooks.d/vpn-wireguard/share/peer      |  4 ++
 5 files changed, 94 insertions(+)
 create mode 100644 playbooks.d/vpn-wireguard/description.txt
 create mode 100644 playbooks.d/vpn-wireguard/etc/defaults
 create mode 100644 playbooks.d/vpn-wireguard/playbook.bash
 create mode 100644 playbooks.d/vpn-wireguard/share/interface
 create mode 100644 playbooks.d/vpn-wireguard/share/peer

(limited to 'playbooks.d')

diff --git a/playbooks.d/vpn-wireguard/description.txt b/playbooks.d/vpn-wireguard/description.txt
new file mode 100644
index 0000000..da242c7
--- /dev/null
+++ b/playbooks.d/vpn-wireguard/description.txt
@@ -0,0 +1 @@
+A meshed VPN through Wireguard
diff --git a/playbooks.d/vpn-wireguard/etc/defaults b/playbooks.d/vpn-wireguard/etc/defaults
new file mode 100644
index 0000000..178e2fd
--- /dev/null
+++ b/playbooks.d/vpn-wireguard/etc/defaults
@@ -0,0 +1 @@
+pkg.wireguard=wireguard
diff --git a/playbooks.d/vpn-wireguard/playbook.bash b/playbooks.d/vpn-wireguard/playbook.bash
new file mode 100644
index 0000000..ae2167d
--- /dev/null
+++ b/playbooks.d/vpn-wireguard/playbook.bash
@@ -0,0 +1,84 @@
+#!/usr/bin/env bash
+
+# shellcheck disable=SC2034
+
+BASHTARD_PLAYBOOK_VARS[$BASHTARD_PLAYBOOK.ip]="required"
+
+playbook_add() {
+	local data
+
+	data="$(playbook_path "data")"
+
+	pkg install wireguard
+
+	# If there's no data directory yet, make it with a proper gitignore to ensure
+	# the private key is not included
+	if [[ ! -d "$data" ]]
+	then
+		mkdir -pv -- "$data"
+		cat <<-EOF >> "$data/.gitignore"
+			privkey
+			EOF
+	fi
+
+	# Generate the private key for this machine
+	( umask 077 && wg genkey > "$data/privkey" )
+
+	# Generate the peerfile for this machine
+	file_template "peer" \
+		endpoint="$(config "$BASHTARD_PLAYBOOK.endpoint")" \
+		ip="$(config "$BASHTARD_PLAYBOOK.ip")" \
+		port="$(config "$BASHTARD_PLAYBOOK.port" "52345")" \
+		pubkey="$(wg pubkey < "$data/privkey")" \
+		> "$data/${BASHTARD_PLATFORM[fqdn]}"
+
+	# Run the sync stage to make sure all the configuration files are written as
+	# desired
+	playbook_sync
+
+	# TODO: Enable the wireguard interface
+	systemctl enable --now wg-quick@wg$(config "$BASTHARD_PLAYBOOK.interface_id" "0").service
+}
+
+playbook_sync() {
+	local data
+	local wgconf
+
+	data="$(playbook_path "data")"
+	wgconf="$(config "fs.etcdir")/wireguard/wg$(config "$BASHTARD_PLAYBOOK.interface_id" "0").conf"
+
+	# Create the wireguard config directory
+	mkdir -pv "$(config "fs.etcdir")/wireguard"
+
+	# Write the Interface section
+	file_template "interface" \
+		ip="$(config "$BASHTARD_PLAYBOOK.ip")" \
+		port="$(config "$BASHTARD_PLAYBOOK.port" "52345")" \
+		privkey="$(cat "$data/privkey")" \
+		> "$wgconf"
+
+	info "$BASHTARD_PLAYBOOK" "Generating wireguard configuration at $wgconf"
+
+	# Include peerfiles for all other machines
+	for path in "$data"/*
+	do
+		local peer="$(basename "$path")"
+
+		[[ "$peer" == "privkey" ]] && continue
+		[[ "$peer" == "${BASHTARD_PLATFORM[fqdn]}" ]] && continue
+
+		# Append all peers, but prepend them with newlines so the resulting file
+		# looks a little nicer
+		printf "\n" >> "$wgconf"
+		cat "$path" >> "$wgconf"
+	done
+
+	# TODO: Refresh the wireguard interface
+	systemctl reload wg-quick@wg$(config "$BASTHARD_PLAYBOOK.interface_id" "0").service
+}
+
+playbook_del() {
+	systemctl disable --now wg-quick@wg$(config "$BASTHARD_PLAYBOOK.interface_id" "0").service
+	rm -f -- "$(config "fs.etcdir")/wireguard/wg$(config "$BASHTARD_PLAYBOOK.interface_id" "0").conf"
+	pkg uninstall wireguard
+}
diff --git a/playbooks.d/vpn-wireguard/share/interface b/playbooks.d/vpn-wireguard/share/interface
new file mode 100644
index 0000000..b45cb16
--- /dev/null
+++ b/playbooks.d/vpn-wireguard/share/interface
@@ -0,0 +1,4 @@
+[Interface]
+Address = ${ip}
+ListenPort = ${port}
+PrivateKey = ${privkey}
diff --git a/playbooks.d/vpn-wireguard/share/peer b/playbooks.d/vpn-wireguard/share/peer
new file mode 100644
index 0000000..ef4eb7c
--- /dev/null
+++ b/playbooks.d/vpn-wireguard/share/peer
@@ -0,0 +1,4 @@
+[Peer]
+AllowedIPs = ${ip}
+Endpoint = ${endpoint}:${port}
+PublicKey = ${pubkey}
-- 
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