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guix/gnu/services/dns.scm
Julien Lepiller ba69e8f7ce
gnu: Add knot-service-type. 
* gnu/services/dns.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.
* doc/guix.texi (DNS Services): New subsubsection.
2017-05-27 10:40:24 +02:00

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;;; 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 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 (srfi srfi-1)
#: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 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 "2d"))
(retry zone-file-retry
(default "15m"))
(expiry zone-file-expiry
(default "2w"))
(nx zone-file-nx
(default "1h")))
(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 "30d"))
(propagation-delay knot-policy-configuration-propagation-delay
(default "1d"))
(rrsig-lifetime knot-policy-configuration-rrsig-lifetime
(default "14d"))
(rrsig-refresh knot-policy-configuration-rrsig-refresh
(default "7d"))
(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 "30d")))
(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))
(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"))
(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 '(#f hmac-md5 hmac-sha1 hmac-sha224 hmac-sha256 hmac-sha384 hmac-sha512)
(knot-key-configuration-algorithm key))
(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 '(pem pkcs11)
(knot-keystore-configuration-backend keystore))
(error-out "backend must be one of: 'pem or 'pkcs11")))
(define (verify-knot-policy-configuration policy)
(unless (knot-keystore-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)
(fold (lambda (x1 x2) (and (string? x1) (string? x2))) "" 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-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)))
(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? #$(knot-zone-configuration-disable-any? zone))
(dnssec-policy #$(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"
#$(format-string-list
(knot-zone-configuration-acl zone))))
(format #t " semantic-checks: ~a\n" (if semantic-checks? "on" "off"))
(format #t " disable-any: ~a\n" (if disable-any? "on" "off"))
(if dnssec-policy
(begin
(format #t " dnssec-signing: on\n")
(format #t " dnssec-policy: ~a\n" dnssec-policy)))
(format #t " serial-policy: ~a\n"
(symbol->string serial-policy)))))))
(define (knot-config-file config)
(verify-knot-configuration config)
(computed-file "knot.conf"
#~(begin
(call-with-output-file #$output
(lambda (port)
(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)
#~(begin
(use-modules (guix build utils))
(define (mkdir-p/perms directory owner perms)
(mkdir-p directory)
(chown directory (passwd:uid owner) (passwd:gid owner))
(chmod directory perms))
(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))))))
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