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services: Add 'dropbear-service'. 

* gnu/services/ssh.scm (<dropbear-configuration>): New record type.
(dropbear-activation, dropbear-shepherd-service, dropbear-service): New
procedures.
(dropbear-service-type): New variable.
* doc/guix.texi (Networking Services): Document it.

Co-authored-by: Ludovic Courtès <ludo@gnu.org>
This commit is contained in:
David Craven 2016-07-13 18:13:12 +02:00 committed by Ludovic Courtès
parent 2102ae2e30
commit 71b0601a97
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2 changed files with 134 additions and 6 deletions
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43
doc/guix.texi
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@ -7754,7 +7754,7 @@ In addition, @var{extra-settings} specifies a string to append to the
configuration file.
@end deffn
Furthermore, @code{(gnu services ssh)} provides the following service.
Furthermore, @code{(gnu services ssh)} provides the following services.
@deffn {Scheme Procedure} lsh-service [#:host-key "/etc/lsh/host-key"] @
[#:daemonic? #t] [#:interfaces '()] [#:port-number 22] @
@ -7792,6 +7792,47 @@ root.
The other options should be self-descriptive.
@end deffn
@deffn {Scheme Procedure} dropbear-service [@var{config}]
Run the @uref{https://matt.ucc.asn.au/dropbear/dropbear.html,Dropbear SSH
daemon} with the given @var{config}, a @code{<dropbear-configuration>}
object.
For example, to specify a Dropbear service listening on port 1234, add
this call to the operating system's @code{services} field:
@example
(dropbear-service (dropbear-configuration
(port-number 1234)))
@end example
@end deffn
@deftp {Data Type} dropbear-configuration
This data type represents the configuration of a Dropbear SSH daemon.
@table @asis
@item @code{dropbear} (default: @var{dropbear})
The Dropbear package to use.
@item @code{port-number} (default: 22)
The TCP port where the daemon waits for incoming connections.
@item @code{syslog-output?} (default: @code{#t})
Whether to enable syslog output.
@item @code{pid-file} (default: @code{"/var/run/dropbear.pid"})
File name of the daemon's PID file.
@item @code{root-login?} (default: @code{#f})
Whether to allow @code{root} logins.
@item @code{allow-empty-passwords?} (default: @code{#f})
Whether to allow empty passwords.
@item @code{password-authentication?} (default: @code{#t})
Whether to enable password-based authentication.
@end table
@end deftp
@defvr {Scheme Variable} %facebook-host-aliases
This variable contains a string for use in @file{/etc/hosts}
(@pxref{Host Names,,, libc, The GNU C Library Reference Manual}). Each

97
gnu/services/ssh.scm
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@ -1,5 +1,6 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014, 2015 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2014, 2015, 2016 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2016 David Craven <david@craven.ch>
;;;
;;; This file is part of GNU Guix.
;;;
@ -17,14 +18,19 @@
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (gnu services ssh)
#:use-module (guix gexp)
#:use-module (guix records)
#:use-module (gnu packages ssh)
#:use-module (gnu services)
#:use-module (gnu services shepherd)
#:use-module (gnu system pam)
#:use-module (gnu packages ssh)
#:use-module (guix gexp)
#:use-module (guix records)
#:use-module (srfi srfi-26)
#:export (lsh-service))
#:export (lsh-service
dropbear-configuration
dropbear-configuration?
dropbear-service-type
dropbear-service))
;;; Commentary:
;;;
@ -235,4 +241,85 @@ The other options should be self-descriptive."
public-key-authentication?)
(initialize? initialize?))))
;;;
;;; Dropbear.
;;;
(define-record-type* <dropbear-configuration>
dropbear-configuration make-dropbear-configuration
dropbear-configuration?
(dropbear dropbear-configuration-dropbear
(default dropbear))
(port-number dropbear-configuration-port-number
(default 22))
(syslog-output? dropbear-configuration-syslog-output?
(default #t))
(pid-file dropbear-configuration-pid-file
(default "/var/run/dropbear.pid"))
(root-login? dropbear-configuration-root-login?
(default #f))
(allow-empty-passwords? dropbear-configuration-allow-empty-passwords?
(default #f))
(password-authentication? dropbear-configuration-password-authentication?
(default #t)))
(define (dropbear-activation config)
"Return the activation gexp for CONFIG."
#~(begin
(mkdir-p "/etc/dropbear")))
(define (dropbear-shepherd-service config)
"Return a <shepherd-service> for dropbear with CONFIG."
(define dropbear
(dropbear-configuration-dropbear config))
(define pid-file
(dropbear-configuration-pid-file config))
(define dropbear-command
#~(list (string-append #$dropbear "/sbin/dropbear")
;; '-R' allows host keys to be automatically generated upon first
;; connection, at a time when /dev/urandom is more likely securely
;; seeded.
"-F" "-R"
"-p" #$(number->string (dropbear-configuration-port-number config))
"-P" #$pid-file
#$@(if (dropbear-configuration-syslog-output? config) '() '("-E"))
#$@(if (dropbear-configuration-root-login? config) '() '("-w"))
#$@(if (dropbear-configuration-password-authentication? config)
'()
'("-s" "-g"))
#$@(if (dropbear-configuration-allow-empty-passwords? config)
'("-B")
'())))
(define requires
(if (dropbear-configuration-syslog-output? config)
'(networking syslogd) '(networking)))
(list (shepherd-service
(documentation "Dropbear SSH server.")
(requirement requires)
(provision '(ssh-daemon))
(start #~(make-forkexec-constructor #$dropbear-command
#:pid-file #$pid-file))
(stop #~(make-kill-destructor)))))
(define dropbear-service-type
(service-type (name 'dropbear)
(extensions
(list (service-extension shepherd-root-service-type
dropbear-shepherd-service)
(service-extension activation-service-type
dropbear-activation)))))
(define* (dropbear-service #:optional (config (dropbear-configuration)))
"Run the @uref{https://matt.ucc.asn.au/dropbear/dropbear.html,Dropbear SSH
daemon} with the given @var{config}, a @code{<dropbear-configuration>}
object."
(service dropbear-service-type config))
;;; ssh.scm ends here