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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013, 2014, 2015 Ludovic Courtès <ludo@gnu.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 networking)
#:use-module (gnu services)
#:use-module (gnu system shadow)
#:use-module (gnu packages admin)
#:use-module (gnu packages linux)
#:use-module (gnu packages tor)
#:use-module (gnu packages messaging)
#:use-module (gnu packages ntp)
#:use-module (guix gexp)
#:use-module (guix store)
#:use-module (guix monads)
#:use-module (srfi srfi-26)
#:export (%facebook-host-aliases
static-networking-service
dhcp-client-service
%ntp-servers
ntp-service
tor-service
bitlbee-service))
;;; Commentary:
;;;
;;; Networking services.
;;;
;;; Code:
(define %facebook-host-aliases
;; This is the list of known Facebook hosts to be added to /etc/hosts if you
;; are to block it.
"\
# Block Facebook IPv4.
127.0.0.1 www.facebook.com
127.0.0.1 facebook.com
127.0.0.1 login.facebook.com
127.0.0.1 www.login.facebook.com
127.0.0.1 fbcdn.net
127.0.0.1 www.fbcdn.net
127.0.0.1 fbcdn.com
127.0.0.1 www.fbcdn.com
127.0.0.1 static.ak.fbcdn.net
127.0.0.1 static.ak.connect.facebook.com
127.0.0.1 connect.facebook.net
127.0.0.1 www.connect.facebook.net
127.0.0.1 apps.facebook.com
# Block Facebook IPv6.
fe80::1%lo0 facebook.com
fe80::1%lo0 login.facebook.com
fe80::1%lo0 www.login.facebook.com
fe80::1%lo0 fbcdn.net
fe80::1%lo0 www.fbcdn.net
fe80::1%lo0 fbcdn.com
fe80::1%lo0 www.fbcdn.com
fe80::1%lo0 static.ak.fbcdn.net
fe80::1%lo0 static.ak.connect.facebook.com
fe80::1%lo0 connect.facebook.net
fe80::1%lo0 www.connect.facebook.net
fe80::1%lo0 apps.facebook.com\n")
(define* (static-networking-service interface ip
#:key
gateway
(provision '(networking))
(name-servers '())
(net-tools net-tools))
"Return a service that starts @var{interface} with address @var{ip}. If
@var{gateway} is true, it must be a string specifying the default network
gateway."
(define loopback?
(memq 'loopback provision))
;; TODO: Eventually replace 'route' with bindings for the appropriate
;; ioctls.
(with-monad %store-monad
(return
(service
;; Unless we're providing the loopback interface, wait for udev to be up
;; and running so that INTERFACE is actually usable.
(requirement (if loopback? '() '(udev)))
(documentation
"Bring up the networking interface using a static IP address.")
(provision provision)
(start #~(lambda _
;; Return #t if successfully started.
(let* ((addr (inet-pton AF_INET #$ip))
(sockaddr (make-socket-address AF_INET addr 0)))
(configure-network-interface #$interface sockaddr
(logior IFF_UP
#$(if loopback?
#~IFF_LOOPBACK
0))))
#$(if gateway
#~(zero? (system* (string-append #$net-tools
"/sbin/route")
"add" "-net" "default"
"gw" #$gateway))
#t)
#$(if (pair? name-servers)
#~(call-with-output-file "/etc/resolv.conf"
(lambda (port)
(display
"# Generated by 'static-networking-service'.\n"
port)
(for-each (lambda (server)
(format port "nameserver ~a~%"
server))
'#$name-servers)))
#t)))
(stop #~(lambda _
;; Return #f is successfully stopped.
(let ((sock (socket AF_INET SOCK_STREAM 0)))
(set-network-interface-flags sock #$interface 0)
(close-port sock))
(not #$(if gateway
#~(system* (string-append #$net-tools
"/sbin/route")
"del" "-net" "default")
#t))))
(respawn? #f)))))
(define* (dhcp-client-service #:key (dhcp isc-dhcp))
"Return a service that runs @var{dhcp}, a Dynamic Host Configuration
Protocol (DHCP) client, on all the non-loopback network interfaces."
(define dhclient
#~(string-append #$dhcp "/sbin/dhclient"))
(define pid-file
"/var/run/dhclient.pid")
(with-monad %store-monad
(return (service
(documentation "Set up networking via DHCP.")
(requirement '(user-processes udev))
;; XXX: Running with '-nw' ("no wait") avoids blocking for a
;; minute when networking is unavailable, but also means that the
;; interface is not up yet when 'start' completes. To wait for
;; the interface to be ready, one should instead monitor udev
;; events.
(provision '(networking))
(start #~(lambda _
;; When invoked without any arguments, 'dhclient'
;; discovers all non-loopback interfaces *that are
;; up*. However, the relevant interfaces are
;; typically down at this point. Thus we perform our
;; own interface discovery here.
(let* ((valid? (negate loopback-network-interface?))
(ifaces (filter valid?
(all-network-interfaces)))
(pid (fork+exec-command
(cons* #$dhclient "-nw"
"-pf" #$pid-file
ifaces))))
(and (zero? (cdr (waitpid pid)))
(call-with-input-file #$pid-file read)))))
(stop #~(make-kill-destructor))))))
(define %ntp-servers
;; Default set of NTP servers.
'("0.pool.ntp.org"
"1.pool.ntp.org"
"2.pool.ntp.org"))
(define* (ntp-service #:key (ntp ntp)
(servers %ntp-servers))
"Return a service that runs the daemon from @var{ntp}, the
@uref{http://www.ntp.org, Network Time Protocol package}. The daemon will
keep the system clock synchronized with that of @var{servers}."
;; TODO: Add authentication support.
(define config
(string-append "driftfile /var/run/ntp.drift\n"
(string-join (map (cut string-append "server " <>)
servers)
"\n")
"
# Disable status queries as a workaround for CVE-2013-5211:
# <http://support.ntp.org/bin/view/Main/SecurityNotice#DRDoS_Amplification_Attack_using>.
restrict default kod nomodify notrap nopeer noquery
restrict -6 default kod nomodify notrap nopeer noquery
# Yet, allow use of the local 'ntpq'.
restrict 127.0.0.1
restrict -6 ::1\n"))
(mlet %store-monad ((ntpd.conf (text-file "ntpd.conf" config)))
(return
(service
(provision '(ntpd))
(documentation "Run the Network Time Protocol (NTP) daemon.")
(requirement '(user-processes networking))
(start #~(make-forkexec-constructor
(list (string-append #$ntp "/bin/ntpd") "-n"
"-c" #$ntpd.conf
"-u" "ntpd")))
(stop #~(make-kill-destructor))
(user-accounts (list (user-account
(name "ntpd")
(group "nogroup")
(system? #t)
(comment "NTP daemon user")
(home-directory "/var/empty")
(shell
"/run/current-system/profile/sbin/nologin"))))))))
(define* (tor-service #:key (tor tor))
"Return a service to run the @uref{https://torproject.org,Tor} daemon.
The daemon runs with the default settings (in particular the default exit
policy) as the @code{tor} unprivileged user."
(mlet %store-monad ((torrc (text-file "torrc" "User tor\n")))
(return
(service
(provision '(tor))
;; Tor needs at least one network interface to be up, hence the
;; dependency on 'loopback'.
(requirement '(user-processes loopback))
(start #~(make-forkexec-constructor
(list (string-append #$tor "/bin/tor") "-f" #$torrc)))
(stop #~(make-kill-destructor))
(user-groups (list (user-group
(name "tor")
(system? #t))))
(user-accounts (list (user-account
(name "tor")
(group "tor")
(system? #t)
(comment "Tor daemon user")
(home-directory "/var/empty")
(shell
"/run/current-system/profile/sbin/nologin"))))
(documentation "Run the Tor anonymous network overlay.")))))
(define* (bitlbee-service #:key (bitlbee bitlbee)
(interface "127.0.0.1") (port 6667)
(extra-settings ""))
"Return a service that runs @url{http://bitlbee.org,BitlBee}, a daemon that
acts as a gateway between IRC and chat networks.
The daemon will listen to the interface corresponding to the IP address
specified in @var{interface}, on @var{port}. @code{127.0.0.1} means that only
local clients can connect, whereas @code{0.0.0.0} means that connections can
come from any networking interface.
In addition, @var{extra-settings} specifies a string to append to the
configuration file."
(mlet %store-monad ((conf (text-file "bitlbee.conf"
(string-append "
[settings]
User = bitlbee
ConfigDir = /var/lib/bitlbee
DaemonInterface = " interface "
DaemonPort = " (number->string port) "
" extra-settings))))
(return
(service
(provision '(bitlbee))
(requirement '(user-processes loopback))
(start #~(make-forkexec-constructor
(list (string-append #$bitlbee "/sbin/bitlbee")
"-n" "-F" "-u" "bitlbee" "-c" #$conf)))
(stop #~(make-kill-destructor))
(user-groups (list (user-group (name "bitlbee") (system? #t))))
(user-accounts (list (user-account
(name "bitlbee")
(group "bitlbee")
(system? #t)
(comment "BitlBee daemon user")
(home-directory "/var/empty")
(shell #~(string-append #$shadow
"/sbin/nologin")))))))))
;;; networking.scm ends here
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