3313f61e18
* gnu/services/vpn.scm (<wireguard-peer>): Add 'keep-alive' field. (wireguard-configuration-file): Use it. * doc/guix.texi (VPN Services): Document it.
652 lines
23 KiB
Scheme
652 lines
23 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2017 Julien Lepiller <julien@lepiller.eu>
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;;; Copyright © 2017 Clément Lassieur <clement@lassieur.org>
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;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
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;;; Copyright © 2021 Guillaume Le Vaillant <glv@posteo.net>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (gnu services vpn)
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#:use-module (gnu services)
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#:use-module (gnu services configuration)
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#:use-module (gnu services shepherd)
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#:use-module (gnu system shadow)
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#:use-module (gnu packages admin)
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#:use-module (gnu packages vpn)
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#:use-module (guix packages)
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#:use-module (guix records)
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#:use-module (guix gexp)
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#:use-module (srfi srfi-1)
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#:use-module (ice-9 match)
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#:use-module (ice-9 regex)
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#:export (openvpn-client-service
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openvpn-server-service
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openvpn-client-service-type
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openvpn-server-service-type
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openvpn-client-configuration
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openvpn-server-configuration
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openvpn-remote-configuration
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openvpn-ccd-configuration
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generate-openvpn-client-documentation
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generate-openvpn-server-documentation
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wireguard-peer
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wireguard-peer?
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wireguard-peer-name
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wireguard-peer-endpoint
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wireguard-peer-allowed-ips
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wireguard-configuration
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wireguard-configuration?
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wireguard-configuration-wireguard
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wireguard-configuration-interface
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wireguard-configuration-addresses
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wireguard-configuration-port
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wireguard-configuration-private-key
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wireguard-configuration-peers
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wireguard-service-type))
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;;;
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;;; OpenVPN.
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;;;
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(define (uglify-field-name name)
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(match name
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('verbosity "verb")
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(_ (let ((str (symbol->string name)))
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(if (string-suffix? "?" str)
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(substring str 0 (1- (string-length str)))
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str)))))
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(define (serialize-field field-name val)
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(if (eq? field-name 'pid-file)
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(format #t "")
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(format #t "~a ~a\n" (uglify-field-name field-name) val)))
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(define serialize-string serialize-field)
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(define-maybe string)
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(define (serialize-boolean field-name val)
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(if val
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(serialize-field field-name "")
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(format #t "")))
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(define (ip-mask? val)
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(and (string? val)
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(if (string-match "^([0-9]+\\.){3}[0-9]+ ([0-9]+\\.){3}[0-9]+$" val)
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(let ((numbers (string-tokenize val char-set:digit)))
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(all-lte numbers (list 255 255 255 255 255 255 255 255)))
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#f)))
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(define serialize-ip-mask serialize-string)
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(define-syntax define-enumerated-field-type
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(lambda (x)
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(define (id-append ctx . parts)
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(datum->syntax ctx (apply symbol-append (map syntax->datum parts))))
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(syntax-case x ()
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((_ name (option ...))
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#`(begin
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(define (#,(id-append #'name #'name #'?) x)
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(memq x '(option ...)))
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(define (#,(id-append #'name #'serialize- #'name) field-name val)
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(serialize-field field-name val)))))))
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(define-enumerated-field-type proto
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(udp tcp udp6 tcp6))
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(define-enumerated-field-type dev
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(tun tap))
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(define key-usage? boolean?)
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(define (serialize-key-usage field-name value)
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(if value
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(format #t "remote-cert-tls server\n")
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#f))
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(define bind? boolean?)
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(define (serialize-bind field-name value)
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(if value
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#f
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(format #t "nobind\n")))
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(define resolv-retry? boolean?)
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(define (serialize-resolv-retry field-name value)
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(if value
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(format #t "resolv-retry infinite\n")
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#f))
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(define (serialize-tls-auth role location)
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(if location
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(serialize-field 'tls-auth
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(string-append location " " (match role
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('server "0")
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('client "1"))))
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#f))
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(define (tls-auth? val)
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(or (eq? val #f)
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(string? val)))
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(define (serialize-tls-auth-server field-name val)
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(serialize-tls-auth 'server val))
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(define (serialize-tls-auth-client field-name val)
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(serialize-tls-auth 'client val))
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(define tls-auth-server? tls-auth?)
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(define tls-auth-client? tls-auth?)
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(define (serialize-number field-name val)
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(serialize-field field-name (number->string val)))
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(define (all-lte left right)
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(if (eq? left '())
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(eq? right '())
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(and (<= (string->number (car left)) (car right))
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(all-lte (cdr left) (cdr right)))))
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(define (cidr4? val)
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(if (string? val)
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(if (string-match "^([0-9]+\\.){3}[0-9]+/[0-9]+$" val)
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(let ((numbers (string-tokenize val char-set:digit)))
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(all-lte numbers (list 255 255 255 255 32)))
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#f)
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(eq? val #f)))
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(define (cidr6? val)
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(if (string? val)
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(string-match "^([0-9a-f]{0,4}:){0,8}/[0-9]{1,3}$" val)
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(eq? val #f)))
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(define (serialize-cidr4 field-name val)
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(if (eq? val #f) #f (serialize-field field-name val)))
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(define (serialize-cidr6 field-name val)
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(if (eq? val #f) #f (serialize-field field-name val)))
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(define (ip? val)
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(if (string? val)
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(if (string-match "^([0-9]+\\.){3}[0-9]+$" val)
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(let ((numbers (string-tokenize val char-set:digit)))
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(all-lte numbers (list 255 255 255 255)))
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#f)
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(eq? val #f)))
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(define (serialize-ip field-name val)
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(if (eq? val #f) #f (serialize-field field-name val)))
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(define (keepalive? val)
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(and (list? val)
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(and (number? (car val))
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(number? (car (cdr val))))))
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(define (serialize-keepalive field-name val)
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(format #t "~a ~a ~a\n" (uglify-field-name field-name)
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(number->string (car val)) (number->string (car (cdr val)))))
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(define gateway? boolean?)
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(define (serialize-gateway field-name val)
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(and val
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(format #t "push \"redirect-gateway\"\n")))
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(define-configuration openvpn-remote-configuration
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(name
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(string "my-server")
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"Server name.")
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(port
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(number 1194)
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"Port number the server listens to."))
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(define-configuration openvpn-ccd-configuration
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(name
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(string "client")
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"Client name.")
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(iroute
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(ip-mask #f)
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"Client own network")
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(ifconfig-push
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(ip-mask #f)
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"Client VPN IP."))
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(define (openvpn-remote-list? val)
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(and (list? val)
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(or (eq? val '())
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(and (openvpn-remote-configuration? (car val))
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(openvpn-remote-list? (cdr val))))))
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(define (serialize-openvpn-remote-list field-name val)
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(for-each (lambda (remote)
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(format #t "remote ~a ~a\n" (openvpn-remote-configuration-name remote)
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(number->string (openvpn-remote-configuration-port remote))))
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val))
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(define (openvpn-ccd-list? val)
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(and (list? val)
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(or (eq? val '())
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(and (openvpn-ccd-configuration? (car val))
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(openvpn-ccd-list? (cdr val))))))
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(define (serialize-openvpn-ccd-list field-name val)
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#f)
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(define (create-ccd-directory val)
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"Create a ccd directory containing files for the ccd configuration option
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of OpenVPN. Each file in this directory represents particular settings for a
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client. Each file is named after the name of the client."
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(let ((files (map (lambda (ccd)
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(list (openvpn-ccd-configuration-name ccd)
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(with-output-to-string
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(lambda ()
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(serialize-configuration
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ccd openvpn-ccd-configuration-fields)))))
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val)))
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(computed-file "ccd"
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(with-imported-modules '((guix build utils))
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#~(begin
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(use-modules (guix build utils))
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(use-modules (ice-9 match))
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(mkdir-p #$output)
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(for-each
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(lambda (ccd)
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(match ccd
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((name config-string)
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(call-with-output-file
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(string-append #$output "/" name)
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(lambda (port) (display config-string port))))))
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'#$files))))))
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(define-syntax define-split-configuration
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(lambda (x)
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(syntax-case x ()
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((_ name1 name2 (common-option ...) (first-option ...) (second-option ...))
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#`(begin
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(define-configuration #,#'name1
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common-option ...
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first-option ...)
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(define-configuration #,#'name2
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common-option ...
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second-option ...))))))
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(define-split-configuration openvpn-client-configuration
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openvpn-server-configuration
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((openvpn
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(package openvpn)
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"The OpenVPN package.")
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(pid-file
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(string "/var/run/openvpn/openvpn.pid")
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"The OpenVPN pid file.")
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(proto
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(proto 'udp)
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"The protocol (UDP or TCP) used to open a channel between clients and
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servers.")
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(dev
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(dev 'tun)
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"The device type used to represent the VPN connection.")
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(ca
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(maybe-string "/etc/openvpn/ca.crt")
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"The certificate authority to check connections against.")
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(cert
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(maybe-string "/etc/openvpn/client.crt")
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"The certificate of the machine the daemon is running on. It should be signed
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by the authority given in @code{ca}.")
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(key
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(maybe-string "/etc/openvpn/client.key")
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"The key of the machine the daemon is running on. It must be the key whose
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certificate is @code{cert}.")
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(comp-lzo?
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(boolean #t)
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"Whether to use the lzo compression algorithm.")
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(persist-key?
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(boolean #t)
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"Don't re-read key files across SIGUSR1 or --ping-restart.")
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(persist-tun?
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(boolean #t)
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"Don't close and reopen TUN/TAP device or run up/down scripts across
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SIGUSR1 or --ping-restart restarts.")
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(fast-io?
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(boolean #f)
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"(Experimental) Optimize TUN/TAP/UDP I/O writes by avoiding a call to
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poll/epoll/select prior to the write operation.")
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(verbosity
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(number 3)
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"Verbosity level."))
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;; client-specific configuration
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((tls-auth
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(tls-auth-client #f)
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"Add an additional layer of HMAC authentication on top of the TLS control
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channel to protect against DoS attacks.")
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(auth-user-pass
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(maybe-string 'disabled)
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"Authenticate with server using username/password. The option is a file
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containing username/password on 2 lines. Do not use a file-like object as it
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would be added to the store and readable by any user.")
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(verify-key-usage?
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(key-usage #t)
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"Whether to check the server certificate has server usage extension.")
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(bind?
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(bind #f)
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"Bind to a specific local port number.")
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(resolv-retry?
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(resolv-retry #t)
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"Retry resolving server address.")
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(remote
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(openvpn-remote-list '())
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"A list of remote servers to connect to."))
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;; server-specific configuration
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((tls-auth
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(tls-auth-server #f)
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"Add an additional layer of HMAC authentication on top of the TLS control
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channel to protect against DoS attacks.")
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(port
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(number 1194)
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"Specifies the port number on which the server listens.")
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(server
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(ip-mask "10.8.0.0 255.255.255.0")
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"An ip and mask specifying the subnet inside the virtual network.")
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(server-ipv6
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(cidr6 #f)
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"A CIDR notation specifying the IPv6 subnet inside the virtual network.")
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(dh
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(string "/etc/openvpn/dh2048.pem")
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"The Diffie-Hellman parameters file.")
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(ifconfig-pool-persist
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(string "/etc/openvpn/ipp.txt")
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"The file that records client IPs.")
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(redirect-gateway?
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(gateway #f)
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"When true, the server will act as a gateway for its clients.")
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(client-to-client?
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(boolean #f)
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"When true, clients are allowed to talk to each other inside the VPN.")
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(keepalive
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(keepalive '(10 120))
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"Causes ping-like messages to be sent back and forth over the link so that
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each side knows when the other side has gone down. @code{keepalive} requires
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a pair. The first element is the period of the ping sending, and the second
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element is the timeout before considering the other side down.")
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(max-clients
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(number 100)
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"The maximum number of clients.")
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(status
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(string "/var/run/openvpn/status")
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"The status file. This file shows a small report on current connection. It
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is truncated and rewritten every minute.")
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(client-config-dir
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(openvpn-ccd-list '())
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"The list of configuration for some clients.")))
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(define (openvpn-config-file role config)
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(let ((config-str
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(with-output-to-string
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(lambda ()
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(serialize-configuration config
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(match role
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('server
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openvpn-server-configuration-fields)
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('client
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openvpn-client-configuration-fields))))))
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(ccd-dir (match role
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('server (create-ccd-directory
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(openvpn-server-configuration-client-config-dir
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config)))
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('client #f))))
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(computed-file "openvpn.conf"
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#~(begin
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(use-modules (ice-9 match))
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(call-with-output-file #$output
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(lambda (port)
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(match '#$role
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('server (display "" port))
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('client (display "client\n" port)))
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(display #$config-str port)
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(match '#$role
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('server (display
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(string-append "client-config-dir "
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#$ccd-dir "\n") port))
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('client (display "" port)))))))))
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(define (openvpn-shepherd-service role)
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(lambda (config)
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(let* ((config-file (openvpn-config-file role config))
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(pid-file ((match role
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('server openvpn-server-configuration-pid-file)
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('client openvpn-client-configuration-pid-file))
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config))
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(openvpn ((match role
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('server openvpn-server-configuration-openvpn)
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('client openvpn-client-configuration-openvpn))
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config))
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(log-file (match role
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('server "/var/log/openvpn-server.log")
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('client "/var/log/openvpn-client.log"))))
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(list (shepherd-service
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(documentation (string-append "Run the OpenVPN "
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(match role
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('server "server")
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('client "client"))
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" daemon."))
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(provision (match role
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('server '(vpn-server))
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('client '(vpn-client))))
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(requirement '(networking))
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(start #~(make-forkexec-constructor
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(list (string-append #$openvpn "/sbin/openvpn")
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"--writepid" #$pid-file "--config" #$config-file
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"--daemon")
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#:pid-file #$pid-file))
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(stop #~(make-kill-destructor)))))))
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(define %openvpn-accounts
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(list (user-group (name "openvpn") (system? #t))
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(user-account
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(name "openvpn")
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(group "openvpn")
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(system? #t)
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(comment "Openvpn daemon user")
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(home-directory "/var/empty")
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(shell (file-append shadow "/sbin/nologin")))))
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(define %openvpn-activation
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#~(begin
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(use-modules (guix build utils))
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(mkdir-p "/var/run/openvpn")))
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(define openvpn-server-service-type
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(service-type (name 'openvpn-server)
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(extensions
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(list (service-extension shepherd-root-service-type
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(openvpn-shepherd-service 'server))
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(service-extension account-service-type
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(const %openvpn-accounts))
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(service-extension activation-service-type
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(const %openvpn-activation))))))
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(define openvpn-client-service-type
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(service-type (name 'openvpn-client)
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(extensions
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(list (service-extension shepherd-root-service-type
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(openvpn-shepherd-service 'client))
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(service-extension account-service-type
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(const %openvpn-accounts))
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(service-extension activation-service-type
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(const %openvpn-activation))))))
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|
||
(define* (openvpn-client-service #:key (config (openvpn-client-configuration)))
|
||
(validate-configuration config openvpn-client-configuration-fields)
|
||
(service openvpn-client-service-type config))
|
||
|
||
(define* (openvpn-server-service #:key (config (openvpn-server-configuration)))
|
||
(validate-configuration config openvpn-server-configuration-fields)
|
||
(service openvpn-server-service-type config))
|
||
|
||
(define (generate-openvpn-server-documentation)
|
||
(generate-documentation
|
||
`((openvpn-server-configuration
|
||
,openvpn-server-configuration-fields
|
||
(ccd openvpn-ccd-configuration))
|
||
(openvpn-ccd-configuration ,openvpn-ccd-configuration-fields))
|
||
'openvpn-server-configuration))
|
||
|
||
(define (generate-openvpn-client-documentation)
|
||
(generate-documentation
|
||
`((openvpn-client-configuration
|
||
,openvpn-client-configuration-fields
|
||
(remote openvpn-remote-configuration))
|
||
(openvpn-remote-configuration ,openvpn-remote-configuration-fields))
|
||
'openvpn-client-configuration))
|
||
|
||
|
||
;;;
|
||
;;; Wireguard.
|
||
;;;
|
||
|
||
(define-record-type* <wireguard-peer>
|
||
wireguard-peer make-wireguard-peer
|
||
wireguard-peer?
|
||
(name wireguard-peer-name)
|
||
(endpoint wireguard-peer-endpoint
|
||
(default #f)) ;string
|
||
(public-key wireguard-peer-public-key) ;string
|
||
(allowed-ips wireguard-peer-allowed-ips) ;list of strings
|
||
(keep-alive wireguard-peer-keep-alive
|
||
(default #f))) ;integer
|
||
|
||
(define-record-type* <wireguard-configuration>
|
||
wireguard-configuration make-wireguard-configuration
|
||
wireguard-configuration?
|
||
(wireguard wireguard-configuration-wireguard ;<package>
|
||
(default wireguard-tools))
|
||
(interface wireguard-configuration-interface ;string
|
||
(default "wg0"))
|
||
(addresses wireguard-configuration-addresses ;string
|
||
(default '("10.0.0.1/32")))
|
||
(port wireguard-configuration-port ;integer
|
||
(default 51820))
|
||
(private-key wireguard-configuration-private-key ;string
|
||
(default "/etc/wireguard/private.key"))
|
||
(peers wireguard-configuration-peers ;list of <wiregard-peer>
|
||
(default '())))
|
||
|
||
(define (wireguard-configuration-file config)
|
||
(define (peer->config peer)
|
||
(let ((name (wireguard-peer-name peer))
|
||
(public-key (wireguard-peer-public-key peer))
|
||
(endpoint (wireguard-peer-endpoint peer))
|
||
(allowed-ips (wireguard-peer-allowed-ips peer))
|
||
(keep-alive (wireguard-peer-keep-alive peer)))
|
||
(format #f "[Peer] #~a
|
||
PublicKey = ~a
|
||
AllowedIPs = ~a
|
||
~a~a"
|
||
name
|
||
public-key
|
||
(string-join allowed-ips ",")
|
||
(if endpoint
|
||
(format #f "Endpoint = ~a\n" endpoint)
|
||
"")
|
||
(if keep-alive
|
||
(format #f "PersistentKeepalive = ~a\n" keep-alive)
|
||
"\n"))))
|
||
|
||
(match-record config <wireguard-configuration>
|
||
(wireguard interface addresses port private-key peers)
|
||
(let* ((config-file (string-append interface ".conf"))
|
||
(peers (map peer->config peers))
|
||
(config
|
||
(computed-file
|
||
"wireguard-config"
|
||
#~(begin
|
||
(mkdir #$output)
|
||
(chdir #$output)
|
||
(call-with-output-file #$config-file
|
||
(lambda (port)
|
||
(let ((format (@ (ice-9 format) format)))
|
||
(format port "[Interface]
|
||
Address = ~a
|
||
PostUp = ~a set %i private-key ~a
|
||
~a
|
||
~{~a~^~%~}"
|
||
#$(string-join addresses ",")
|
||
#$(file-append wireguard "/bin/wg")
|
||
#$private-key
|
||
#$(if port
|
||
(format #f "ListenPort = ~a" port)
|
||
"")
|
||
(list #$@peers)))))))))
|
||
(file-append config "/" config-file))))
|
||
|
||
(define (wireguard-activation config)
|
||
(match-record config <wireguard-configuration>
|
||
(private-key)
|
||
#~(begin
|
||
(use-modules (guix build utils)
|
||
(ice-9 popen)
|
||
(ice-9 rdelim))
|
||
(mkdir-p (dirname #$private-key))
|
||
(unless (file-exists? #$private-key)
|
||
(let* ((pipe
|
||
(open-input-pipe (string-append
|
||
#$(file-append wireguard-tools "/bin/wg")
|
||
" genkey")))
|
||
(key (read-line pipe)))
|
||
(call-with-output-file #$private-key
|
||
(lambda (port)
|
||
(display key port)))
|
||
(chmod #$private-key #o400)
|
||
(close-pipe pipe))))))
|
||
|
||
(define (wireguard-shepherd-service config)
|
||
(match-record config <wireguard-configuration>
|
||
(wireguard interface)
|
||
(let ((wg-quick (file-append wireguard "/bin/wg-quick"))
|
||
(config (wireguard-configuration-file config)))
|
||
(list (shepherd-service
|
||
(requirement '(networking))
|
||
(provision (list
|
||
(symbol-append 'wireguard-
|
||
(string->symbol interface))))
|
||
(start #~(lambda _
|
||
(invoke #$wg-quick "up" #$config)))
|
||
(stop #~(lambda _
|
||
(invoke #$wg-quick "down" #$config)))
|
||
(documentation "Run the Wireguard VPN tunnel"))))))
|
||
|
||
(define wireguard-service-type
|
||
(service-type
|
||
(name 'wireguard)
|
||
(extensions
|
||
(list (service-extension shepherd-root-service-type
|
||
wireguard-shepherd-service)
|
||
(service-extension activation-service-type
|
||
wireguard-activation)))))
|