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