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services: secret-service: Turn into a Shepherd service.

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* gnu/services/virtualization.scm (secret-service-activation): Remove.
(secret-service-shepherd-services): New procedure.
(secret-service-type)[extensions]: Remove ACTIVATION-SERVICE-TYPE
extension.  Add SHEPHERD-ROOT-SERVICE-TYPE and
USER-PROCESSES-SERVICE-TYPE extensions.
* gnu/build/secret-service.scm (delete-file*): New procedure.
(secret-service-receive-secrets): Use it.
This commit is contained in:
Ludovic Courtès 2021-10-25 08:33:04 +02:00
parent 0cc742b261
commit 39e3b4b7ce
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GPG key ID: 090B11993D9AEBB5
2 changed files with 49 additions and 13 deletions
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17
gnu/build/secret-service.scm
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@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2020 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2020, 2021 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
;;;
;;; This file is part of GNU Guix.
@ -111,6 +111,15 @@ (define (send-files sock)
(close-port sock)
#f))))
(define (delete-file* file)
"Ensure FILE does not exist."
(catch 'system-error
(lambda ()
(delete-file file))
(lambda args
(unless (= ENOENT (system-error-errno args))
(apply throw args)))))
(define (secret-service-receive-secrets port)
"Listen to local PORT and wait for a secret service client to send secrets.
Write them to the file system. Return the list of files installed on success,
@ -170,6 +179,12 @@ (define (read-secrets port)
(log "installing file '~a' (~a bytes)...~%"
file size)
(mkdir-p (dirname file))
;; It could be that FILE already exists, for instance
;; because it has been created by a service's activation
;; snippet (e.g., SSH host keys). Delete it.
(delete-file* file)
(call-with-output-file file
(lambda (output)
(dump port output size)

35
gnu/services/virtualization.scm
View file

@ -898,23 +898,44 @@ (define qemu-guest-agent-service-type
;;; Secrets for guest VMs.
;;;
(define (secret-service-activation port)
"Return an activation snippet that fetches sensitive material at local PORT,
(define (secret-service-shepherd-services port)
"Return a Shepherd service that fetches sensitive material at local PORT,
over TCP. Reboot upon failure."
(with-imported-modules '((gnu build secret-service)
;; This is a Shepherd service, rather than an activation snippet, to make
;; sure it is started once 'networking' is up so it can accept incoming
;; connections.
(list
(shepherd-service
(documentation "Fetch secrets from the host at startup time.")
(provision '(secret-service-client))
(requirement '(loopback networking))
(modules '((gnu build secret-service)
(guix build utils)))
(start (with-imported-modules '((gnu build secret-service)
(guix build utils))
#~(begin
(use-modules (gnu build secret-service))
#~(lambda ()
;; Since shepherd's output port goes to /dev/log, write this
;; message to stderr so it's visible on the Mach console.
(format (current-error-port)
"receiving secrets from the host...~%")
(force-output (current-error-port))
(let ((sent (secret-service-receive-secrets #$port)))
(unless sent
(sleep 3)
(reboot))))))
(stop #~(const #f)))))
(define secret-service-type
(service-type
(name 'secret-service)
(extensions (list (service-extension activation-service-type
secret-service-activation)))
(extensions (list (service-extension shepherd-root-service-type
secret-service-shepherd-services)
;; Make every Shepherd service depend on
;; 'secret-service-client'.
(service-extension user-processes-service-type
(const '(secret-service-client)))))
(description
"This service fetches secret key and other sensitive material over TCP at
boot time. This service is meant to be used by virtual machines (VMs) that