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#!/usr/bin/env ruby
require 'yaml'
require 'fileutils'
# Generates Wireguard keys and config files for each host
class KeyTool
def initialize(myself)
raise 'Wireguard tool not found' unless system('which wg > /dev/null 2>&1')
keys_dir = "keys/#{myself}/"
FileUtils.mkdir_p(keys_dir) unless Dir.exist?(keys_dir)
@pubkey_path = "#{keys_dir}/pubkey"
@privkey_path = "#{keys_dir}/privkey"
@preshared_path = "#{keys_dir}/preshared"
generate! if !File.exist?(@pubkey_path) ||
!File.exist?(@privkey_path) ||
!File.exist?(@preshared_path)
end
def pub = File.read(@pubkey_path).strip
def priv = File.read(@privkey_path).strip
def preshared = File.read(@preshared_path).strip
private
def generate! = gen_privpub! && genpsk!
def genpsk! = File.write(@preshared_path, `wg genpsk`)
def gen_privpub!
privkey = IO.popen('wg genkey', 'r+', &:read)
IO.popen('wg pubkey', 'r+') do |io|
io.puts(privkey)
io.close_write
File.write(@privkey_path, privkey)
File.write(@pubkey_path, io.read)
end
end
end
PeerSnippet = Struct.new(:myself, :domain, :allowed_ips, :endpoint) do
def to_s
keytool = KeyTool.new(myself)
<<~PEER_CONFIG
[Peer]
# #{myself}.#{domain}
PublicKey = #{keytool.pub}
PresharedKey = #{keytool.preshared}
Endpoint = #{endpoint}:56709
AllowedIPs = #{allowed_ips}/32
PEER_CONFIG
end
end
WireguardConfig = Struct.new(:myself, :hosts) do
def to_s
keytool = KeyTool.new(myself)
<<~CONFIG
[Interface]
# #{myself}.#{hosts[myself]['wg0']['domain']}
Address = #{hosts[myself]['wg0']['ip']}
PrivateKey = #{keytool.priv}
PresharedKey = #{keytool.preshared}
ListenPort = 56709
#{peer_snippets}
CONFIG
end
def generate!
dist_dir = "dist/#{myself}/etc/wireguard"
FileUtils.mkdir_p(dist_dir) unless Dir.exist?(dist_dir)
File.write("#{dist_dir}/wg0.conf", to_s)
end
private
def peer_snippets
hosts.reject { _1 == myself }.map do |hostname, data|
PeerSnippet.new(hostname, data['wg0']['domain'],
data['wg0']['ip'], data['lan']['ip'])
end.map(&:to_s).join("\n")
end
end
CONFIG = YAML.load_file('wireguardmeshgenerator.yaml').freeze
CONFIG['hosts'].each_key do |hostname|
WireguardConfig.new(hostname, CONFIG['hosts']).generate!
end
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