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guix/gnu/services/dns.scm
Maxime Devos 520bac7ed0
services: Prevent following symlinks during activation. 
This addresses a potential security issue, where a compromised
service could trick the activation code in changing the permissions,
owner and group of arbitrary files.  However, this patch is
currently only a partial fix, due to a TOCTTOU (time-of-check to
time-of-use) race, which can be fixed once guile has bindings
to openat and friends.

Fixes: <https://lists.gnu.org/archive/html/guix-devel/2021-01/msg00388.html>

* gnu/build/activation.scm: new procedure 'mkdir-p/perms'.
* gnu/services/authentication.scm
  (%nslcd-activation, nslcd-service-type): use new procedure.
* gnu/services/cups.scm (%cups-activation): likewise.
* gnu/services/dbus.scm (dbus-activation): likewise.
* gnu/services/dns.scm (knot-activation): likewise.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>
2021-03-10 18:01:47 +01:00

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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2017 Julien Lepiller <julien@lepiller.eu>
;;; Copyright © 2018 Oleg Pykhalov <go.wigust@gmail.com>
;;; Copyright © 2020 Pierre Langlois <pierre.langlois@gmx.com>
;;; Copyright © 2021 Maxime Devos <maximedevos@telenet.be>
;;;
;;; 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 dns)
#: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 dns)
#:use-module (guix packages)
#:use-module (guix records)
#:use-module (guix gexp)
#:use-module (guix modules)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
#:use-module (srfi srfi-34)
#:use-module (srfi srfi-35)
#:use-module (ice-9 match)
#:use-module (ice-9 regex)
#:export (knot-service-type
knot-acl-configuration
knot-key-configuration
knot-keystore-configuration
knot-zone-configuration
knot-remote-configuration
knot-policy-configuration
knot-configuration
define-zone-entries
zone-file
zone-entry
knot-resolver-service-type
knot-resolver-configuration
dnsmasq-service-type
dnsmasq-configuration
ddclient-service-type
ddclient-configuration))
;;;
;;; Knot DNS.
;;;
(define-record-type* <knot-key-configuration>
knot-key-configuration make-knot-key-configuration
knot-key-configuration?
(id knot-key-configuration-id
(default ""))
(algorithm knot-key-configuration-algorithm
(default #f)); one of #f, or an algorithm name
(secret knot-key-configuration-secret
(default "")))
(define-record-type* <knot-acl-configuration>
knot-acl-configuration make-knot-acl-configuration
knot-acl-configuration?
(id knot-acl-configuration-id
(default ""))
(address knot-acl-configuration-address
(default '()))
(key knot-acl-configuration-key
(default '()))
(action knot-acl-configuration-action
(default '()))
(deny? knot-acl-configuration-deny?
(default #f)))
(define-record-type* <zone-entry>
zone-entry make-zone-entry
zone-entry?
(name zone-entry-name
(default "@"))
(ttl zone-entry-ttl
(default ""))
(class zone-entry-class
(default "IN"))
(type zone-entry-type
(default "A"))
(data zone-entry-data
(default "")))
(define-record-type* <zone-file>
zone-file make-zone-file
zone-file?
(entries zone-file-entries
(default '()))
(origin zone-file-origin
(default ""))
(ns zone-file-ns
(default "ns"))
(mail zone-file-mail
(default "hostmaster"))
(serial zone-file-serial
(default 1))
(refresh zone-file-refresh
(default (* 2 24 3600)))
(retry zone-file-retry
(default (* 15 60)))
(expiry zone-file-expiry
(default (* 2 7 24 3600)))
(nx zone-file-nx
(default 3600)))
(define-record-type* <knot-keystore-configuration>
knot-keystore-configuration make-knot-keystore-configuration
knot-keystore-configuration?
(id knot-keystore-configuration-id
(default ""))
(backend knot-keystore-configuration-backend
(default 'pem))
(config knot-keystore-configuration-config
(default "/var/lib/knot/keys/keys")))
(define-record-type* <knot-policy-configuration>
knot-policy-configuration make-knot-policy-configuration
knot-policy-configuration?
(id knot-policy-configuration-id
(default ""))
(keystore knot-policy-configuration-keystore
(default "default"))
(manual? knot-policy-configuration-manual?
(default #f))
(single-type-signing? knot-policy-configuration-single-type-signing?
(default #f))
(algorithm knot-policy-configuration-algorithm
(default "ecdsap256sha256"))
(ksk-size knot-policy-configuration-ksk-size
(default 256))
(zsk-size knot-policy-configuration-zsk-size
(default 256))
(dnskey-ttl knot-policy-configuration-dnskey-ttl
(default 'default))
(zsk-lifetime knot-policy-configuration-zsk-lifetime
(default (* 30 24 3600)))
(propagation-delay knot-policy-configuration-propagation-delay
(default (* 24 3600)))
(rrsig-lifetime knot-policy-configuration-rrsig-lifetime
(default (* 14 24 3600)))
(rrsig-refresh knot-policy-configuration-rrsig-refresh
(default (* 7 24 3600)))
(nsec3? knot-policy-configuration-nsec3?
(default #f))
(nsec3-iterations knot-policy-configuration-nsec3-iterations
(default 5))
(nsec3-salt-length knot-policy-configuration-nsec3-salt-length
(default 8))
(nsec3-salt-lifetime knot-policy-configuration-nsec3-salt-lifetime
(default (* 30 24 3600))))
(define-record-type* <knot-zone-configuration>
knot-zone-configuration make-knot-zone-configuration
knot-zone-configuration?
(domain knot-zone-configuration-domain
(default ""))
(file knot-zone-configuration-file
(default "")) ; the file where this zone is saved.
(zone knot-zone-configuration-zone
(default (zone-file))) ; initial content of the zone file
(master knot-zone-configuration-master
(default '()))
(ddns-master knot-zone-configuration-ddns-master
(default #f))
(notify knot-zone-configuration-notify
(default '()))
(acl knot-zone-configuration-acl
(default '()))
(semantic-checks? knot-zone-configuration-semantic-checks?
(default #f))
(disable-any? knot-zone-configuration-disable-any?
(default #f))
(zonefile-sync knot-zone-configuration-zonefile-sync
(default 0))
(zonefile-load knot-zone-configuration-zonefile-load
(default #f))
(journal-content knot-zone-configuration-journal-content
(default #f))
(max-journal-usage knot-zone-configuration-max-journal-usage
(default #f))
(max-journal-depth knot-zone-configuration-max-journal-depth
(default #f))
(max-zone-size knot-zone-configuration-max-zone-size
(default #f))
(dnssec-policy knot-zone-configuration-dnssec-policy
(default #f))
(serial-policy knot-zone-configuration-serial-policy
(default 'increment)))
(define-record-type* <knot-remote-configuration>
knot-remote-configuration make-knot-remote-configuration
knot-remote-configuration?
(id knot-remote-configuration-id
(default ""))
(address knot-remote-configuration-address
(default '()))
(via knot-remote-configuration-via
(default '()))
(key knot-remote-configuration-key
(default #f)))
(define-record-type* <knot-configuration>
knot-configuration make-knot-configuration
knot-configuration?
(knot knot-configuration-knot
(default knot))
(run-directory knot-configuration-run-directory
(default "/var/run/knot"))
(includes knot-configuration-includes
(default '()))
(listen-v4 knot-configuration-listen-v4
(default "0.0.0.0"))
(listen-v6 knot-configuration-listen-v6
(default "::"))
(listen-port knot-configuration-listen-port
(default 53))
(keys knot-configuration-keys
(default '()))
(keystores knot-configuration-keystores
(default '()))
(acls knot-configuration-acls
(default '()))
(remotes knot-configuration-remotes
(default '()))
(policies knot-configuration-policies
(default '()))
(zones knot-configuration-zones
(default '())))
(define-syntax define-zone-entries
(syntax-rules ()
((_ id (name ttl class type data) ...)
(define id (list (make-zone-entry name ttl class type data) ...)))))
(define (error-out msg)
(raise (condition (&message (message msg)))))
(define (verify-knot-key-configuration key)
(unless (knot-key-configuration? key)
(error-out "keys must be a list of only knot-key-configuration."))
(let ((id (knot-key-configuration-id key)))
(unless (and (string? id) (not (equal? id "")))
(error-out "key id must be a non empty string.")))
(unless (memq (knot-key-configuration-algorithm key)
'(#f hmac-md5 hmac-sha1 hmac-sha224 hmac-sha256 hmac-sha384 hmac-sha512))
(error-out "algorithm must be one of: #f, 'hmac-md5, 'hmac-sha1,
'hmac-sha224, 'hmac-sha256, 'hmac-sha384 or 'hmac-sha512")))
(define (verify-knot-keystore-configuration keystore)
(unless (knot-keystore-configuration? keystore)
(error-out "keystores must be a list of only knot-keystore-configuration."))
(let ((id (knot-keystore-configuration-id keystore)))
(unless (and (string? id) (not (equal? id "")))
(error-out "keystore id must be a non empty string.")))
(unless (memq (knot-keystore-configuration-backend keystore)
'(pem pkcs11))
(error-out "backend must be one of: 'pem or 'pkcs11")))
(define (verify-knot-policy-configuration policy)
(unless (knot-policy-configuration? policy)
(error-out "policies must be a list of only knot-policy-configuration."))
(let ((id (knot-policy-configuration-id policy)))
(unless (and (string? id) (not (equal? id "")))
(error-out "policy id must be a non empty string."))))
(define (verify-knot-acl-configuration acl)
(unless (knot-acl-configuration? acl)
(error-out "acls must be a list of only knot-acl-configuration."))
(let ((id (knot-acl-configuration-id acl))
(address (knot-acl-configuration-address acl))
(key (knot-acl-configuration-key acl))
(action (knot-acl-configuration-action acl)))
(unless (and (string? id) (not (equal? id "")))
(error-out "acl id must be a non empty string."))
(unless (and (list? address)
(every string? address))
(error-out "acl address must be a list of strings.")))
(unless (boolean? (knot-acl-configuration-deny? acl))
(error-out "deny? must be #t or #f.")))
(define (verify-knot-zone-configuration zone)
(unless (knot-zone-configuration? zone)
(error-out "zones must be a list of only knot-zone-configuration."))
(let ((domain (knot-zone-configuration-domain zone)))
(unless (and (string? domain) (not (equal? domain "")))
(error-out "zone domain must be a non empty string."))))
(define (verify-knot-remote-configuration remote)
(unless (knot-remote-configuration? remote)
(error-out "remotes must be a list of only knot-remote-configuration."))
(let ((id (knot-remote-configuration-id remote)))
(unless (and (string? id) (not (equal? id "")))
(error-out "remote id must be a non empty string."))))
(define (verify-knot-configuration config)
(unless (package? (knot-configuration-knot config))
(error-out "knot configuration field must be a package."))
(unless (string? (knot-configuration-run-directory config))
(error-out "run-directory must be a string."))
(unless (list? (knot-configuration-includes config))
(error-out "includes must be a list of strings or file-like objects."))
(unless (list? (knot-configuration-keys config))
(error-out "keys must be a list of knot-key-configuration."))
(for-each (lambda (key) (verify-knot-key-configuration key))
(knot-configuration-keys config))
(unless (list? (knot-configuration-keystores config))
(error-out "keystores must be a list of knot-keystore-configuration."))
(for-each (lambda (keystore) (verify-knot-keystore-configuration keystore))
(knot-configuration-keystores config))
(unless (list? (knot-configuration-acls config))
(error-out "acls must be a list of knot-acl-configuration."))
(for-each (lambda (acl) (verify-knot-acl-configuration acl))
(knot-configuration-acls config))
(unless (list? (knot-configuration-zones config))
(error-out "zones must be a list of knot-zone-configuration."))
(for-each (lambda (zone) (verify-knot-zone-configuration zone))
(knot-configuration-zones config))
(unless (list? (knot-configuration-policies config))
(error-out "policies must be a list of knot-policy-configuration."))
(for-each (lambda (policy) (verify-knot-policy-configuration policy))
(knot-configuration-policies config))
(unless (list? (knot-configuration-remotes config))
(error-out "remotes must be a list of knot-remote-configuration."))
(for-each (lambda (remote) (verify-knot-remote-configuration remote))
(knot-configuration-remotes config))
#t)
(define (format-string-list l)
"Formats a list of string in YAML"
(if (eq? l '())
""
(let ((l (reverse l)))
(string-append
"["
(fold (lambda (x1 x2)
(string-append (if (symbol? x1) (symbol->string x1) x1) ", "
(if (symbol? x2) (symbol->string x2) x2)))
(if (symbol? (car l)) (symbol->string (car l)) (car l)) (cdr l))
"]"))))
(define (knot-acl-config acls)
(with-output-to-string
(lambda ()
(for-each
(lambda (acl-config)
(let ((id (knot-acl-configuration-id acl-config))
(address (knot-acl-configuration-address acl-config))
(key (knot-acl-configuration-key acl-config))
(action (knot-acl-configuration-action acl-config))
(deny? (knot-acl-configuration-deny? acl-config)))
(format #t " - id: ~a\n" id)
(unless (eq? address '())
(format #t " address: ~a\n" (format-string-list address)))
(unless (eq? key '())
(format #t " key: ~a\n" (format-string-list key)))
(unless (eq? action '())
(format #t " action: ~a\n" (format-string-list action)))
(format #t " deny: ~a\n" (if deny? "on" "off"))))
acls))))
(define (knot-key-config keys)
(with-output-to-string
(lambda ()
(for-each
(lambda (key-config)
(let ((id (knot-key-configuration-id key-config))
(algorithm (knot-key-configuration-algorithm key-config))
(secret (knot-key-configuration-secret key-config)))
(format #t " - id: ~a\n" id)
(if algorithm
(format #t " algorithm: ~a\n" (symbol->string algorithm)))
(format #t " secret: ~a\n" secret)))
keys))))
(define (knot-keystore-config keystores)
(with-output-to-string
(lambda ()
(for-each
(lambda (keystore-config)
(let ((id (knot-keystore-configuration-id keystore-config))
(backend (knot-keystore-configuration-backend keystore-config))
(config (knot-keystore-configuration-config keystore-config)))
(format #t " - id: ~a\n" id)
(format #t " backend: ~a\n" (symbol->string backend))
(format #t " config: \"~a\"\n" config)))
keystores))))
(define (knot-policy-config policies)
(with-output-to-string
(lambda ()
(for-each
(lambda (policy-config)
(let ((id (knot-policy-configuration-id policy-config))
(keystore (knot-policy-configuration-keystore policy-config))
(manual? (knot-policy-configuration-manual? policy-config))
(single-type-signing? (knot-policy-configuration-single-type-signing?
policy-config))
(algorithm (knot-policy-configuration-algorithm policy-config))
(ksk-size (knot-policy-configuration-ksk-size policy-config))
(zsk-size (knot-policy-configuration-zsk-size policy-config))
(dnskey-ttl (knot-policy-configuration-dnskey-ttl policy-config))
(zsk-lifetime (knot-policy-configuration-zsk-lifetime policy-config))
(propagation-delay (knot-policy-configuration-propagation-delay
policy-config))
(rrsig-lifetime (knot-policy-configuration-rrsig-lifetime
policy-config))
(nsec3? (knot-policy-configuration-nsec3? policy-config))
(nsec3-iterations (knot-policy-configuration-nsec3-iterations
policy-config))
(nsec3-salt-length (knot-policy-configuration-nsec3-salt-length
policy-config))
(nsec3-salt-lifetime (knot-policy-configuration-nsec3-salt-lifetime
policy-config)))
(format #t " - id: ~a\n" id)
(format #t " keystore: ~a\n" keystore)
(format #t " manual: ~a\n" (if manual? "on" "off"))
(format #t " single-type-signing: ~a\n" (if single-type-signing?
"on" "off"))
(format #t " algorithm: ~a\n" algorithm)
(format #t " ksk-size: ~a\n" (number->string ksk-size))
(format #t " zsk-size: ~a\n" (number->string zsk-size))
(unless (eq? dnskey-ttl 'default)
(format #t " dnskey-ttl: ~a\n" dnskey-ttl))
(format #t " zsk-lifetime: ~a\n" zsk-lifetime)
(format #t " propagation-delay: ~a\n" propagation-delay)
(format #t " rrsig-lifetime: ~a\n" rrsig-lifetime)
(format #t " nsec3: ~a\n" (if nsec3? "on" "off"))
(format #t " nsec3-iterations: ~a\n"
(number->string nsec3-iterations))
(format #t " nsec3-salt-length: ~a\n"
(number->string nsec3-salt-length))
(format #t " nsec3-salt-lifetime: ~a\n" nsec3-salt-lifetime)))
policies))))
(define (knot-remote-config remotes)
(with-output-to-string
(lambda ()
(for-each
(lambda (remote-config)
(let ((id (knot-remote-configuration-id remote-config))
(address (knot-remote-configuration-address remote-config))
(via (knot-remote-configuration-via remote-config))
(key (knot-remote-configuration-key remote-config)))
(format #t " - id: ~a\n" id)
(unless (eq? address '())
(format #t " address: ~a\n" (format-string-list address)))
(unless (eq? via '())
(format #t " via: ~a\n" (format-string-list via)))
(if key
(format #t " key: ~a\n" key))))
remotes))))
(define (serialize-zone-entries entries)
(with-output-to-string
(lambda ()
(for-each
(lambda (entry)
(let ((name (zone-entry-name entry))
(ttl (zone-entry-ttl entry))
(class (zone-entry-class entry))
(type (zone-entry-type entry))
(data (zone-entry-data entry)))
(format #t "~a ~a ~a ~a ~a\n" name ttl class type data)))
entries))))
(define (serialize-zone-file zone domain)
(computed-file (string-append domain ".zone")
#~(begin
(call-with-output-file #$output
(lambda (port)
(format port "$ORIGIN ~a.\n"
#$(zone-file-origin zone))
(format port "@ IN SOA ~a ~a (~a ~a ~a ~a ~a)\n"
#$(zone-file-ns zone)
#$(zone-file-mail zone)
#$(zone-file-serial zone)
#$(zone-file-refresh zone)
#$(zone-file-retry zone)
#$(zone-file-expiry zone)
#$(zone-file-nx zone))
(format port "~a\n"
#$(serialize-zone-entries (zone-file-entries zone))))))))
(define (knot-zone-config zone)
(let ((content (knot-zone-configuration-zone zone)))
#~(with-output-to-string
(lambda ()
(let ((domain #$(knot-zone-configuration-domain zone))
(file #$(knot-zone-configuration-file zone))
(master (list #$@(knot-zone-configuration-master zone)))
(ddns-master #$(knot-zone-configuration-ddns-master zone))
(notify (list #$@(knot-zone-configuration-notify zone)))
(acl (list #$@(knot-zone-configuration-acl zone)))
(semantic-checks? #$(knot-zone-configuration-semantic-checks? zone))
(disable-any? #$(knot-zone-configuration-disable-any? zone))
(zonefile-sync #$(knot-zone-configuration-zonefile-sync zone))
(zonefile-load '#$(knot-zone-configuration-zonefile-load zone))
(journal-content #$(knot-zone-configuration-journal-content zone))
(max-journal-usage #$(knot-zone-configuration-max-journal-usage zone))
(max-journal-depth #$(knot-zone-configuration-max-journal-depth zone))
(max-zone-size #$(knot-zone-configuration-max-zone-size zone))
(dnssec-policy #$(knot-zone-configuration-dnssec-policy zone))
(serial-policy '#$(knot-zone-configuration-serial-policy zone)))
(format #t " - domain: ~a\n" domain)
(if (eq? master '())
;; This server is a master
(if (equal? file "")
(format #t " file: ~a\n"
#$(serialize-zone-file content
(knot-zone-configuration-domain zone)))
(format #t " file: ~a\n" file))
;; This server is a slave (has masters)
(begin
(format #t " master: ~a\n"
#$(format-string-list
(knot-zone-configuration-master zone)))
(if ddns-master (format #t " ddns-master ~a\n" ddns-master))))
(unless (eq? notify '())
(format #t " notify: ~a\n"
#$(format-string-list
(knot-zone-configuration-notify zone))))
(unless (eq? acl '())
(format #t " acl: ~a\n"
#$(format-string-list
(knot-zone-configuration-acl zone))))
(format #t " semantic-checks: ~a\n" (if semantic-checks? "on" "off"))
(format #t " disable-any: ~a\n" (if disable-any? "on" "off"))
(if zonefile-sync
(format #t " zonefile-sync: ~a\n" zonefile-sync))
(if zonefile-load
(format #t " zonefile-load: ~a\n"
(symbol->string zonefile-load)))
(if journal-content
(format #t " journal-content: ~a\n"
(symbol->string journal-content)))
(if max-journal-usage
(format #t " max-journal-usage: ~a\n" max-journal-usage))
(if max-journal-depth
(format #t " max-journal-depth: ~a\n" max-journal-depth))
(if max-zone-size
(format #t " max-zone-size: ~a\n" max-zone-size))
(if dnssec-policy
(begin
(format #t " dnssec-signing: on\n")
(format #t " dnssec-policy: ~a\n" dnssec-policy)))
(format #t " serial-policy: ~a\n"
(symbol->string serial-policy)))))))
(define (knot-config-file config)
(verify-knot-configuration config)
(computed-file "knot.conf"
#~(begin
(call-with-output-file #$output
(lambda (port)
(for-each (lambda (inc)
(format port "include: ~a\n" inc))
'#$(knot-configuration-includes config))
(format port "server:\n")
(format port " rundir: ~a\n" #$(knot-configuration-run-directory config))
(format port " user: knot\n")
(format port " listen: ~a@~a\n"
#$(knot-configuration-listen-v4 config)
#$(knot-configuration-listen-port config))
(format port " listen: ~a@~a\n"
#$(knot-configuration-listen-v6 config)
#$(knot-configuration-listen-port config))
(format port "\nkey:\n")
(format port #$(knot-key-config (knot-configuration-keys config)))
(format port "\nkeystore:\n")
(format port #$(knot-keystore-config (knot-configuration-keystores config)))
(format port "\nacl:\n")
(format port #$(knot-acl-config (knot-configuration-acls config)))
(format port "\nremote:\n")
(format port #$(knot-remote-config (knot-configuration-remotes config)))
(format port "\npolicy:\n")
(format port #$(knot-policy-config (knot-configuration-policies config)))
(unless #$(eq? (knot-configuration-zones config) '())
(format port "\nzone:\n")
(format port "~a\n"
(string-concatenate
(list #$@(map knot-zone-config
(knot-configuration-zones config)))))))))))
(define %knot-accounts
(list (user-group (name "knot") (system? #t))
(user-account
(name "knot")
(group "knot")
(system? #t)
(comment "knot dns server user")
(home-directory "/var/empty")
(shell (file-append shadow "/sbin/nologin")))))
(define (knot-activation config)
(with-imported-modules (source-module-closure '((gnu build activation)))
#~(begin
(use-modules (gnu build activation))
(mkdir-p/perms #$(knot-configuration-run-directory config)
(getpwnam "knot") #o755)
(mkdir-p/perms "/var/lib/knot" (getpwnam "knot") #o755)
(mkdir-p/perms "/var/lib/knot/keys" (getpwnam "knot") #o755)
(mkdir-p/perms "/var/lib/knot/keys/keys" (getpwnam "knot") #o755))))
(define (knot-shepherd-service config)
(let* ((config-file (knot-config-file config))
(knot (knot-configuration-knot config)))
(list (shepherd-service
(documentation "Run the Knot DNS daemon.")
(provision '(knot dns))
(requirement '(networking))
(start #~(make-forkexec-constructor
(list (string-append #$knot "/sbin/knotd")
"-c" #$config-file)))
(stop #~(make-kill-destructor))))))
(define knot-service-type
(service-type (name 'knot)
(extensions
(list (service-extension shepherd-root-service-type
knot-shepherd-service)
(service-extension activation-service-type
knot-activation)
(service-extension account-service-type
(const %knot-accounts))))
(description
"Run @uref{https://www.knot-dns.cz/, Knot}, an authoritative
name server for the @acronym{DNS, Domain Name System}.")))
;;;
;;; Knot Resolver.
;;;
(define-record-type* <knot-resolver-configuration>
knot-resolver-configuration
make-knot-resolver-configuration
knot-resolver-configuration?
(package knot-resolver-configuration-package
(default knot-resolver))
(kresd-config-file knot-resolver-kresd-config-file
(default %kresd.conf))
(garbage-collection-interval knot-resolver-garbage-collection-interval
(default 1000)))
(define %kresd.conf
(plain-file "kresd.conf" "-- -*- mode: lua -*-
trust_anchors.add_file('/var/cache/knot-resolver/root.keys')
net = { '127.0.0.1', '::1' }
user('knot-resolver', 'knot-resolver')
modules = { 'hints > iterate', 'stats', 'predict' }
cache.size = 100 * MB
"))
(define %knot-resolver-accounts
(list (user-group
(name "knot-resolver")
(system? #t))
(user-account
(name "knot-resolver")
(group "knot-resolver")
(system? #t)
(home-directory "/var/cache/knot-resolver")
(shell (file-append shadow "/sbin/nologin")))))
(define (knot-resolver-activation config)
#~(begin
(use-modules (guix build utils))
(let ((rundir "/var/cache/knot-resolver")
(owner (getpwnam "knot-resolver")))
(mkdir-p rundir)
(chown rundir (passwd:uid owner) (passwd:gid owner)))))
(define knot-resolver-shepherd-services
(match-lambda
(($ <knot-resolver-configuration> package
kresd-config-file
garbage-collection-interval)
(list
(shepherd-service
(provision '(kresd))
(requirement '(networking))
(documentation "Run the Knot Resolver daemon.")
(start #~(make-forkexec-constructor
'(#$(file-append package "/sbin/kresd")
"-c" #$kresd-config-file "-n"
"/var/cache/knot-resolver")))
(stop #~(make-kill-destructor)))
(shepherd-service
(provision '(kres-cache-gc))
(requirement '(user-processes))
(documentation "Run the Knot Resolver Garbage Collector daemon.")
(start #~(make-forkexec-constructor
'(#$(file-append package "/sbin/kres-cache-gc")
"-d" #$(number->string garbage-collection-interval)
"-c" "/var/cache/knot-resolver")
#:user "knot-resolver"
#:group "knot-resolver"))
(stop #~(make-kill-destructor)))))))
(define knot-resolver-service-type
(service-type
(name 'knot-resolver)
(extensions
(list (service-extension shepherd-root-service-type
knot-resolver-shepherd-services)
(service-extension activation-service-type
knot-resolver-activation)
(service-extension account-service-type
(const %knot-resolver-accounts))))
(default-value (knot-resolver-configuration))
(description "Run the Knot DNS Resolver.")))
;;;
;;; Dnsmasq.
;;;
(define-record-type* <dnsmasq-configuration>
dnsmasq-configuration make-dnsmasq-configuration
dnsmasq-configuration?
(package dnsmasq-configuration-package
(default dnsmasq)) ;package
(no-hosts? dnsmasq-configuration-no-hosts?
(default #f)) ;boolean
(port dnsmasq-configuration-port
(default 53)) ;integer
(local-service? dnsmasq-configuration-local-service?
(default #t)) ;boolean
(listen-addresses dnsmasq-configuration-listen-address
(default '())) ;list of string
(resolv-file dnsmasq-configuration-resolv-file
(default "/etc/resolv.conf")) ;string
(no-resolv? dnsmasq-configuration-no-resolv?
(default #f)) ;boolean
(servers dnsmasq-configuration-servers
(default '())) ;list of string
(addresses dnsmasq-configuration-addresses
(default '())) ;list of string
(cache-size dnsmasq-configuration-cache-size
(default 150)) ;integer
(negative-cache? dnsmasq-configuration-negative-cache?
(default #t)) ;boolean
(tftp-enable? dnsmasq-configuration-tftp-enable?
(default #f)) ;boolean
(tftp-no-fail? dnsmasq-configuration-tftp-no-fail?
(default #f)) ;boolean
(tftp-single-port? dnsmasq-configuration-tftp-single-port?
(default #f)) ;boolean
(tftp-secure? dnsmasq-tftp-secure?
(default #f)) ;boolean
(tftp-max dnsmasq-tftp-max
(default #f)) ;integer
(tftp-mtu dnsmasq-tftp-mtu
(default #f)) ;integer
(tftp-no-blocksize? dnsmasq-tftp-no-blocksize?
(default #f)) ;boolean
(tftp-lowercase? dnsmasq-tftp-lowercase?
(default #f)) ;boolean
(tftp-port-range dnsmasq-tftp-port-range
(default #f)) ;string
(tftp-root dnsmasq-tftp-root
(default "/var/empty,lo")) ;string
(tftp-unique-root dnsmasq-tftp-unique-root
(default #f))) ;"" or "ip" or "mac"
(define dnsmasq-shepherd-service
(match-lambda
(($ <dnsmasq-configuration> package
no-hosts?
port local-service? listen-addresses
resolv-file no-resolv? servers
addresses cache-size negative-cache?
tftp-enable? tftp-no-fail?
tftp-single-port? tftp-secure?
tftp-max tftp-mtu tftp-no-blocksize?
tftp-lowercase? tftp-port-range
tftp-root tftp-unique-root)
(shepherd-service
(provision '(dnsmasq))
(requirement '(networking))
(documentation "Run the dnsmasq DNS server.")
(start #~(make-forkexec-constructor
'(#$(file-append package "/sbin/dnsmasq")
"--keep-in-foreground"
"--pid-file=/run/dnsmasq.pid"
#$@(if no-hosts?
'("--no-hosts")
'())
#$(format #f "--port=~a" port)
#$@(if local-service?
'("--local-service")
'())
#$@(map (cut format #f "--listen-address=~a" <>)
listen-addresses)
#$(format #f "--resolv-file=~a" resolv-file)
#$@(if no-resolv?
'("--no-resolv")
'())
#$@(map (cut format #f "--server=~a" <>)
servers)
#$@(map (cut format #f "--address=~a" <>)
addresses)
#$(format #f "--cache-size=~a" cache-size)
#$@(if negative-cache?
'()
'("--no-negcache"))
#$@(if tftp-enable?
'("--enable-tftp")
'())
#$@(if tftp-no-fail?
'("--tftp-no-fail")
'())
#$@(if tftp-single-port?
'("--tftp-single-port")
'())
#$@(if tftp-secure?
'("--tftp-secure?")
'())
#$@(if tftp-max
(list (format #f "--tftp-max=~a" tftp-max))
'())
#$@(if tftp-mtu
(list (format #f "--tftp-mtu=~a" tftp-mtu))
'())
#$@(if tftp-no-blocksize?
'("--tftp-no-blocksize")
'())
#$@(if tftp-lowercase?
'("--tftp-lowercase")
'())
#$@(if tftp-port-range
(list (format #f "--tftp-port-range=~a"
tftp-port-range))
'())
#$@(if tftp-root
(list (format #f "--tftp-root=~a" tftp-root))
'())
#$@(if tftp-unique-root
(list
(if (> (length tftp-unique-root) 0)
(format #f "--tftp-unique-root=~a" tftp-unique-root)
(format #f "--tftp-unique-root")))
'()))
#:pid-file "/run/dnsmasq.pid"))
(stop #~(make-kill-destructor))))))
(define dnsmasq-service-type
(service-type
(name 'dnsmasq)
(extensions
(list (service-extension shepherd-root-service-type
(compose list dnsmasq-shepherd-service))))
(default-value (dnsmasq-configuration))
(description "Run the dnsmasq DNS server.")))
;;;
;;; ddclient
;;;
(define (uglify-field-name field-name)
(string-delete #\? (symbol->string field-name)))
(define (serialize-field field-name val)
(when (not (member field-name '(group secret-file user)))
(format #t "~a=~a\n" (uglify-field-name field-name) val)))
(define (serialize-boolean field-name val)
(serialize-field field-name (if val "yes" "no")))
(define (serialize-integer field-name val)
(serialize-field field-name (number->string val)))
(define (serialize-string field-name val)
(if (and (string? val) (string=? val ""))
""
(serialize-field field-name val)))
(define (serialize-list field-name val)
(if (null? val) "" (serialize-field field-name (string-join val))))
(define (serialize-extra-options extra-options)
(string-join extra-options "\n" 'suffix))
(define-configuration ddclient-configuration
(ddclient
(package ddclient)
"The ddclient package.")
(daemon
(integer 300)
"The period after which ddclient will retry to check IP and domain name.")
(syslog
(boolean #t)
"Use syslog for the output.")
(mail
(string "root")
"Mail to user.")
(mail-failure
(string "root")
"Mail failed update to user.")
(pid
(string "/var/run/ddclient/ddclient.pid")
"The ddclient PID file.")
(ssl
(boolean #t)
"Enable SSL support.")
(user
(string "ddclient")
"Specifies the user name or ID that is used when running ddclient
program.")
(group
(string "ddclient")
"Group of the user who will run the ddclient program.")
(secret-file
(string "/etc/ddclient/secrets.conf")
"Secret file which will be appended to @file{ddclient.conf} file. This
file contains credentials for use by ddclient. You are expected to create it
manually.")
(extra-options
(list '())
"Extra options will be appended to @file{ddclient.conf} file."))
(define (ddclient-account config)
"Return the user accounts and user groups for CONFIG."
(let ((ddclient-user (ddclient-configuration-user config))
(ddclient-group (ddclient-configuration-group config)))
(list (user-group
(name ddclient-group)
(system? #t))
(user-account
(name ddclient-user)
(system? #t)
(group ddclient-group)
(comment "ddclientd privilege separation user")
(home-directory (string-append "/var/run/" ddclient-user))))))
(define (ddclient-activation config)
"Return the activation GEXP for CONFIG."
(with-imported-modules '((guix build utils)
(ice-9 rdelim))
#~(begin
(use-modules (guix build utils)
(ice-9 rdelim))
(let ((ddclient-user
(passwd:uid (getpw #$(ddclient-configuration-user config))))
(ddclient-group
(passwd:gid (getpw #$(ddclient-configuration-group config))))
(ddclient-secret-file
#$(ddclient-configuration-secret-file config)))
;; 'ddclient' complains about ddclient.conf file permissions, which
;; rules out /gnu/store. Thus we copy the ddclient.conf to /etc.
(for-each (lambda (dir)
(mkdir-p dir)
(chmod dir #o700)
(chown dir ddclient-user ddclient-group))
'("/var/cache/ddclient" "/var/run/ddclient"
"/etc/ddclient"))
(with-output-to-file "/etc/ddclient/ddclient.conf"
(lambda ()
(display
(string-append
"# Generated by 'ddclient-service'.\n\n"
#$(with-output-to-string
(lambda ()
(serialize-configuration config
ddclient-configuration-fields)))
(if (string-null? ddclient-secret-file)
""
(format #f "\n\n# Appended from '~a'.\n\n~a"
ddclient-secret-file
(with-input-from-file ddclient-secret-file
read-string)))))))
(chmod "/etc/ddclient/ddclient.conf" #o600)
(chown "/etc/ddclient/ddclient.conf"
ddclient-user ddclient-group)))))
(define (ddclient-shepherd-service config)
"Return a <shepherd-service> for ddclient with CONFIG."
(let ((ddclient (ddclient-configuration-ddclient config))
(ddclient-pid (ddclient-configuration-pid config))
(ddclient-user (ddclient-configuration-user config))
(ddclient-group (ddclient-configuration-group config)))
(list (shepherd-service
(provision '(ddclient))
(documentation "Run ddclient daemon.")
(start #~(make-forkexec-constructor
(list #$(file-append ddclient "/bin/ddclient")
"-foreground"
"-file" "/etc/ddclient/ddclient.conf")
#:pid-file #$ddclient-pid
#:environment-variables
(list "SSL_CERT_DIR=/run/current-system/profile\
/etc/ssl/certs"
"SSL_CERT_FILE=/run/current-system/profile\
/etc/ssl/certs/ca-certificates.crt")
#:user #$ddclient-user
#:group #$ddclient-group))
(stop #~(make-kill-destructor))))))
(define ddclient-service-type
(service-type
(name 'ddclient)
(extensions
(list (service-extension account-service-type
ddclient-account)
(service-extension shepherd-root-service-type
ddclient-shepherd-service)
(service-extension activation-service-type
ddclient-activation)))
(default-value (ddclient-configuration))
(description "Configure address updating utility for dynamic DNS services,
ddclient.")))
(define (generate-ddclient-documentation)
(generate-documentation
`((ddclient-configuration ,ddclient-configuration-fields))
'ddclient-configuration))
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