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#!/usr/bin/env ruby
require 'English'
require 'fileutils'
require 'net/scp'
require 'net/ssh'
require 'yaml'
require 'optparse'
class KeyTool
def initialize(myself)
raise 'Wireguard tool not found' unless system('which wg > /dev/null 2>&1')
@myself = myself
@psk_dir = 'keys/psk'
mykeys_dir = "keys/#{myself}"
[mykeys_dir, @psk_dir].each do |dir|
FileUtils.mkdir_p(dir) unless Dir.exist?(dir)
end
@pubkey_path = "#{mykeys_dir}/pub.key"
@privkey_path = "#{mykeys_dir}/priv.key"
gen_privpub! if !File.exist?(@pubkey_path) || !File.exist?(@privkey_path)
end
def pub = File.read(@pubkey_path).strip
def priv = File.read(@privkey_path).strip
# Preshared key
def psk(peer)
psk_path = "#{@psk_dir}/#{[@myself, peer].sort.join('_')}.key"
gen_psk!(psk_path) unless File.exist?(psk_path)
File.read(psk_path).strip
end
private
def gen_psk!(psk_path) = File.write(psk_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, :peer, :domain, :wgdomain,
:allowed_ips, :endpoint, :keepalive) do
def to_s
keytool = KeyTool.new(myself)
<<~PEER_CONF
[Peer]
# #{myself}.#{domain} as #{myself}.#{wgdomain}
PublicKey = #{keytool.pub}
PresharedKey = #{keytool.psk(peer)}
AllowedIPs = #{allowed_ips}/32
#{endpoint_str}
#{keepalive_str}
PEER_CONF
end
def endpoint_str
return '# Due to NAT no Endpoint configured' if endpoint == :behind_nat
"Endpoint = #{endpoint}:56709"
end
def keepalive_str
return '# No KeepAlive configured' unless keepalive
'PersistentKeepalive = 25'
end
end
WireguardConfig = Struct.new(:myself, :hosts) do
def to_s
keytool = KeyTool.new(myself)
<<~CONF
[Interface]
# #{myself}.#{hosts[myself]['wg0']['domain']}
#{address}
PrivateKey = #{keytool.priv}
ListenPort = 56709
#{peers(&:to_s).join("\n")}
CONF
end
def clean!
%w[dist keys].select { |dir| Dir.exist?(dir) }.each do |dir|
FileUtils.rm_r(dir)
end
end
def generate!
dist_dir = "dist/#{myself}/etc/wireguard"
puts "Generating #{dist_dir}/wg0.conf"
FileUtils.mkdir_p(dist_dir) unless Dir.exist?(dist_dir)
File.write("#{dist_dir}/wg0.conf", to_s)
end
private
def address
return '# No Address = ... for OpenBSD here' if hosts[myself]['os'] == 'OpenBSD'
"Address = #{hosts[myself]['wg0']['ip']}"
end
def peers
excluded = hosts[myself].fetch('exclude_peers', []) << myself
i_am_in_lan = hosts[myself].key?('lan')
hosts.reject { excluded.include?(_1) }.map do |peer, data|
peer_is_in_lan = data.key?('lan')
reach = data[peer_is_in_lan ? 'lan' : 'internet']
endpoint = if peer_is_in_lan == i_am_in_lan ||
!peer_is_in_lan
reach['ip']
else
:behind_nat
end
keepalive = i_am_in_lan && !peer_is_in_lan
PeerSnippet.new(peer, myself, reach['domain'], data['wg0']['domain'],
data['wg0']['ip'], endpoint, keepalive)
end
end
end
InstallConfig = Struct.new(:myself, :hosts) do
def initialize(myself, hosts)
@myself = myself
data = hosts[myself]
domain = data.dig('lan', 'domain') || data.dig('internet', 'domain')
@fqdn = "#{myself}.#{domain}"
@ssh_user = data['ssh']['user']
@sudo_cmd = data['ssh']['sudo_cmd']
@reload_cmd = data['ssh']['reload_cmd']
@conf_dir = data['ssh']['conf_dir']
end
def upload!
wg0_conf = "dist/#{@myself}/etc/wireguard/wg0.conf"
scp(wg0_conf)
self
end
def install!
puts "Installing Wireguard config on #{@myself}"
ssh <<~SH
if [ ! -d #{@conf_dir} ]; then
#{@sudo_cmd} mkdir -p #{@conf_dir}
fi
#{@sudo_cmd} chmod 700 #{@conf_dir}
#{@sudo_cmd} mv -v wg0.conf #{@conf_dir}
#{@sudo_cmd} chmod 644 #{@conf_dir}/wg0.conf
SH
end
def restart!
puts "Reloading Wireguard on #{@myself}"
ssh <<~SH
#{@sudo_cmd} #{@reload_cmd}
#{@sudo_cmd} wg show
SH
end
private
def scp(src, dst = '.')
puts "Uploading #{src} to #{@fqdn}:#{dst}"
raise "Upload #{srd} to #{@fqdn}:#{dst} failed" unless
Net::SCP.upload!(@fqdn, @ssh_user, src, dst)
end
def ssh(cmd)
File.write('cmd.sh', <<~SH) and scp('cmd.sh')
#!/bin/sh
set -x
#{cmd}
rm $0
SH
File.delete('cmd.sh') if File.exist?('cmd.sh')
Net::SSH.start(@fqdn, @ssh_user) do |ssh|
output = ssh.exec!('sh cmd.sh')
raise output unless output.exitstatus.zero?
puts output
end
self
end
end
begin
options = { hosts: [] }
OptionParser.new do |opts|
opts.on('--generate', 'Generate Wireguard configs') do
options[:generate] = true
end
opts.on('--install', 'Install Wireguard configs') do
options[:install] = true
end
opts.on('--clean', 'Clean Wireguard configs') do
options[:clean] = true
end
opts.on('--hosts=HOSTS', 'Comma separated hosts to configure') do |hosts|
options[:hosts] = hosts.split(',')
end
end.parse!
conf = YAML.load_file('wireguardmeshgenerator.yaml').freeze
conf['hosts'].keys.select { options[:hosts].empty? || options[:hosts].include?(_1) }
.each do |host|
WireguardConfig.new(host, conf['hosts']).generate! if options[:generate]
InstallConfig.new(host, conf['hosts']).upload!.install!.restart! if options[:install]
WireguardConfig.new(host, conf['hosts']).clean! if options[:clean]
end
rescue StandardError => e
puts "Error: #{e.message}"
puts e.backtrace.join("\n")
exit 2
end
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