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gnu: services: Add iptables service.
* gnu/services/networking.scm (<iptables-configuration>): New record type. (iptables-service-type): New variable. * gnu/tests/networking.scm (run-iptables-test): New procedure. (%test-iptables): New variable. * doc/guix.texi (Networking Services): Document it.
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Arun Isaac
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3 changed files with 231 additions and 2 deletions
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@ -11612,6 +11612,54 @@ Thus, it can be instantiated like this:
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@end lisp
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@end defvr
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@cindex iptables
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@defvr {Scheme Variable} iptables-service-type
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This is the service type to set up an iptables configuration. iptables is a
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packet filtering framework supported by the Linux kernel. This service
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supports configuring iptables for both IPv4 and IPv6. A simple example
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configuration rejecting all incoming connections except those to the ssh port
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22 is shown below.
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@lisp
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(service iptables-service-type
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(iptables-configuration
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(ipv4-rules (plain-file "iptables.rules" "*filter
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:INPUT ACCEPT
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:FORWARD ACCEPT
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:OUTPUT ACCEPT
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-A INPUT -p tcp --dport 22 -j ACCEPT
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-A INPUT -j REJECT --reject-with icmp-port-unreachable
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COMMIT
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"))
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(ipv6-rules (plain-file "ip6tables.rules" "*filter
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:INPUT ACCEPT
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:FORWARD ACCEPT
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:OUTPUT ACCEPT
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-A INPUT -p tcp --dport 22 -j ACCEPT
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-A INPUT -j REJECT --reject-with icmp6-port-unreachable
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COMMIT
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"))))
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@end lisp
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@end defvr
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@deftp {Data Type} iptables-configuration
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The data type representing the configuration of iptables.
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@table @asis
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@item @code{iptables} (default: @code{iptables})
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The iptables package that provides @code{iptables-restore} and
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@code{ip6tables-restore}.
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@item @code{ipv4-rules} (default: @code{%iptables-accept-all-rules})
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The iptables rules to use. It will be passed to @code{iptables-restore}.
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This may be any ``file-like'' object (@pxref{G-Expressions, file-like
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objects}).
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@item @code{ipv6-rules} (default: @code{%iptables-accept-all-rules})
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The ip6tables rules to use. It will be passed to @code{ip6tables-restore}.
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This may be any ``file-like'' object (@pxref{G-Expressions, file-like
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objects}).
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@end table
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@end deftp
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@cindex NTP
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@cindex real time clock
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@deffn {Scheme Procedure} ntp-service [#:ntp @var{ntp}] @
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@ -8,6 +8,7 @@
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;;; Copyright © 2017 Marius Bakke <mbakke@fastmail.com>
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;;; Copyright © 2018 Tobias Geerinckx-Rice <me@tobias.gr>
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;;; Copyright © 2018 Chris Marusich <cmmarusich@gmail.com>
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;;; Copyright © 2018 Arun Isaac <arunisaac@systemreboot.net>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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@ -103,7 +104,14 @@ (define-module (gnu services networking)
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wpa-supplicant-service-type
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openvswitch-service-type
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openvswitch-configuration))
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openvswitch-configuration
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iptables-configuration
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iptables-configuration?
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iptables-configuration-iptables
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iptables-configuration-ipv4-rules
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iptables-configuration-ipv6-rules
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iptables-service-type))
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;;; Commentary:
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;;;
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@ -1108,4 +1116,50 @@ (define openvswitch-service-type
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switch designed to enable massive network automation through programmatic
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extension.")))
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;;;
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;;; iptables
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;;;
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(define %iptables-accept-all-rules
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(plain-file "iptables-accept-all.rules"
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"*filter
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:INPUT ACCEPT
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:FORWARD ACCEPT
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:OUTPUT ACCEPT
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COMMIT
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"))
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(define-record-type* <iptables-configuration>
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iptables-configuration make-iptables-configuration iptables-configuration?
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(iptables iptables-configuration-iptables
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(default iptables))
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(ipv4-rules iptables-configuration-ipv4-rules
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(default %iptables-accept-all-rules))
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(ipv6-rules iptables-configuration-ipv6-rules
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(default %iptables-accept-all-rules)))
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(define iptables-shepherd-service
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(match-lambda
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(($ <iptables-configuration> iptables ipv4-rules ipv6-rules)
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(let ((iptables-restore (file-append iptables "/sbin/iptables-restore"))
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(ip6tables-restore (file-append iptables "/sbin/ip6tables-restore")))
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(shepherd-service
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(documentation "Packet filtering framework")
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(provision '(iptables))
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(start #~(lambda _
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(invoke #$iptables-restore #$ipv4-rules)
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(invoke #$ip6tables-restore #$ipv6-rules)))
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(stop #~(lambda _
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(invoke #$iptables-restore #$%iptables-accept-all-rules)
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(invoke #$ip6tables-restore #$%iptables-accept-all-rules))))))))
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(define iptables-service-type
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(service-type
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(name 'iptables)
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(description
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"Run @command{iptables-restore}, setting up the specified rules.")
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(extensions
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(list (service-extension shepherd-root-service-type
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(compose list iptables-shepherd-service))))))
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;;; networking.scm ends here
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@ -2,6 +2,7 @@
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;;; Copyright © 2017 Thomas Danckaert <post@thomasdanckaert.be>
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;;; Copyright © 2017 Marius Bakke <mbakke@fastmail.com>
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;;; Copyright © 2018 Chris Marusich <cmmarusich@gmail.com>
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;;; Copyright © 2018 Arun Isaac <arunisaac@systemreboot.net>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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@ -29,9 +30,11 @@ (define-module (gnu tests networking)
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#:use-module (guix store)
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#:use-module (guix monads)
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#:use-module (gnu packages bash)
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#:use-module (gnu packages linux)
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#:use-module (gnu packages networking)
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#:use-module (gnu services shepherd)
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#:export (%test-inetd %test-openvswitch %test-dhcpd %test-tor))
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#:use-module (ice-9 match)
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#:export (%test-inetd %test-openvswitch %test-dhcpd %test-tor %test-iptables))
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(define %inetd-os
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;; Operating system with 2 inetd services.
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@ -434,3 +437,127 @@ (define %test-tor
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(name "tor")
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(description "Test a running Tor daemon configuration.")
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(value (run-tor-test))))
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(define* (run-iptables-test)
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"Run tests of 'iptables-service-type'."
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(define iptables-rules
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"*filter
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:INPUT ACCEPT
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:FORWARD ACCEPT
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:OUTPUT ACCEPT
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-A INPUT -p tcp -m tcp --dport 7 -j REJECT --reject-with icmp-port-unreachable
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COMMIT
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")
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(define ip6tables-rules
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"*filter
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:INPUT ACCEPT
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:FORWARD ACCEPT
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:OUTPUT ACCEPT
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-A INPUT -p tcp -m tcp --dport 7 -j REJECT --reject-with icmp6-port-unreachable
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COMMIT
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")
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(define inetd-echo-port 7)
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(define os
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(marionette-operating-system
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(simple-operating-system
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(dhcp-client-service)
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(service inetd-service-type
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(inetd-configuration
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(entries (list
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(inetd-entry
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(name "echo")
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(socket-type 'stream)
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(protocol "tcp")
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(wait? #f)
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(user "root"))))))
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(service iptables-service-type
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(iptables-configuration
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(ipv4-rules (plain-file "iptables.rules" iptables-rules))
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(ipv6-rules (plain-file "ip6tables.rules" ip6tables-rules)))))
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#:imported-modules '((gnu services herd))
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#:requirements '(inetd iptables)))
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(define test
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(with-imported-modules '((gnu build marionette))
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#~(begin
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(use-modules (srfi srfi-64)
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(gnu build marionette))
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(define marionette
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(make-marionette (list #$(virtual-machine os))))
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(define (dump-iptables iptables-save marionette)
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(marionette-eval
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`(begin
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(use-modules (ice-9 popen)
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(ice-9 rdelim)
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(ice-9 regex))
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(call-with-output-string
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(lambda (out)
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(call-with-port
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(open-pipe* OPEN_READ ,iptables-save)
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(lambda (in)
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(let loop ((line (read-line in)))
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;; iptables-save does not output rules in the exact
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;; same format we loaded using iptables-restore. It
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;; adds comments, packet counters, etc. We remove
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;; these additions.
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(unless (eof-object? line)
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(cond
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;; Remove comments
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((string-match "^#" line) #t)
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;; Remove packet counters
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((string-match "^:([A-Z]*) ([A-Z]*) .*" line)
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=> (lambda (match-record)
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(format out ":~a ~a~%"
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(match:substring match-record 1)
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(match:substring match-record 2))))
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;; Pass other lines without modification
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(else (display line out)
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(newline out)))
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(loop (read-line in)))))))))
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marionette))
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(mkdir #$output)
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(chdir #$output)
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(test-begin "iptables")
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(test-equal "iptables-save dumps the same rules that were loaded"
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(dump-iptables #$(file-append iptables "/sbin/iptables-save")
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marionette)
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#$iptables-rules)
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(test-equal "ip6tables-save dumps the same rules that were loaded"
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(dump-iptables #$(file-append iptables "/sbin/ip6tables-save")
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marionette)
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#$ip6tables-rules)
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(test-error "iptables firewall blocks access to inetd echo service"
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'misc-error
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(wait-for-tcp-port inetd-echo-port marionette #:timeout 5))
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;; TODO: This test freezes up at the login prompt without any
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;; relevant messages on the console. Perhaps it is waiting for some
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;; timeout. Find and fix this issue.
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;; (test-assert "inetd echo service is accessible after iptables firewall is stopped"
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;; (begin
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;; (marionette-eval
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;; '(begin
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;; (use-modules (gnu services herd))
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;; (stop-service 'iptables))
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;; marionette)
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;; (wait-for-tcp-port inetd-echo-port marionette #:timeout 5)))
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(test-end)
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(exit (= (test-runner-fail-count (test-runner-current)) 0)))))
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(gexp->derivation "iptables" test))
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(define %test-iptables
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(system-test
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(name "iptables")
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(description "Test a running iptables daemon.")
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(value (run-iptables-test))))
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