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Diffstat (limited to 'gnu/services/vpn.scm')
| -rw-r--r-- | gnu/services/vpn.scm | 491 |
1 files changed, 491 insertions, 0 deletions
diff --git a/gnu/services/vpn.scm b/gnu/services/vpn.scm new file mode 100644 index 0000000000..c21995453e --- /dev/null +++ b/gnu/services/vpn.scm @@ -0,0 +1,491 @@ +;;; GNU Guix --- Functional package management for GNU +;;; Copyright © 2017 Julien Lepiller <julien@lepiller.eu> +;;; +;;; 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 + #~(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)) |