home-services: gnupg: Add a xdg-compliant home-gnupg-service
anemofilia
Luis Guilherme Coelho
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;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2023 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2023 Efraim Flashner <efraim@flashner.co.il>
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;;; Copyright © 2023 Luis Guilherme Coelho <lgcoelho@disroot.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (radix home services gnupg)
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#:use-module (guix gexp)
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#:use-module ((guix records) #:select (match-record))
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#:use-module (gnu services)
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#:use-module (gnu services configuration)
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#:use-module (gnu home services)
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#:use-module (gnu home services shepherd)
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#:autoload (gnu packages gnupg) (gnupg pinentry parcimonie)
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#:export (home-gpg-agent-configuration
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home-gpg-agent-configuration?
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home-gpg-agent-configuration-gnupg
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home-gpg-agent-configuration-gnupghome
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home-gpg-agent-configuration-pinentry-program
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home-gpg-agent-configuration-ssh-support?
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home-gpg-agent-configuration-default-cache-ttl
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home-gpg-agent-configuration-max-cache-ttl
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home-gpg-agent-configuration-max-cache-ttl-ssh
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home-gpg-agent-configuration-extra-content
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home-gpg-agent-service-type
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home-parcimonie-configuration
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home-parcimonie-configuration?
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home-parcimonie-configuration-parcimonie
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home-parcimonie-configuration-gnupg-already-torified?
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home-parcimonie-configuration-refresh-guix-keyrings?
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home-parcimonie-configuration-extra-content
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home-parcimonie-service-type))
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(define raw-configuration-string? string?)
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;; Configuration of 'gpg-agent'.
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(define-configuration/no-serialization home-gpg-agent-configuration
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(gnupg
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(file-like gnupg)
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"The GnuPG package to use.")
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(gnupghome
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(string ".gnupg")
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"Directory, with path relative to the users home folder, used to store gnupg
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files.")
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(pinentry-program
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(file-like (file-append pinentry "/bin/pinentry-curses"))
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"Pinentry program to use. Pinentry is a small user interface that
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@command{gpg-agent} delegates to anytime it needs user input for a passphrase
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or @acronym{PIN, personal identification number} (@pxref{Top,,, pinentry,
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Using the PIN-Entry}).")
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(ssh-support?
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(boolean #f)
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"Whether to enable @acronym{SSH, secure shell} support. When true,
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@command{gpg-agent} acts as a drop-in replacement for OpenSSH's
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@command{ssh-agent} program, taking care of OpenSSH secret keys and directing
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passphrase requests to the chosen Pinentry program.")
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(default-cache-ttl
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(integer 600)
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"Time a cache entry is valid, in seconds.")
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(max-cache-ttl
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(integer 7200)
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"Maximum time a cache entry is valid, in seconds. After this time a cache
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entry will be expired even if it has been accessed recently.")
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(default-cache-ttl-ssh
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(integer 1800)
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"Time a cache entry for SSH keys is valid, in seconds.")
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(max-cache-ttl-ssh
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(integer 7200)
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"Maximum time a cache entry for SSH keys is valid, in seconds.")
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(extra-content
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(raw-configuration-string "")
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"Raw content to add to the end of @file{~/.gnupg/gpg-agent.conf}."))
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(define (home-gpg-agent-configuration-file config)
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"Return the @file{gpg-agent.conf} file for @var{config}."
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(match-record config <home-gpg-agent-configuration>
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(pinentry-program default-cache-ttl max-cache-ttl
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default-cache-ttl-ssh max-cache-ttl-ssh
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extra-content)
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(mixed-text-file "gpg-agent.conf"
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"pinentry-program " pinentry-program "\n"
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"default-cache-ttl "
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(number->string default-cache-ttl) "\n"
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"max-cache-ttl "
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(number->string max-cache-ttl) "\n"
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"default-cache-ttl-ssh "
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(number->string default-cache-ttl-ssh) "\n"
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"max-cache-ttl-ssh "
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(number->string max-cache-ttl-ssh) "\n"
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extra-content)))
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(define (home-gpg-agent-shepherd-services config)
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"Return the possibly-empty list of Shepherd services for @var{config}."
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(match-record config <home-gpg-agent-configuration>
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(gnupg ssh-support?)
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;; 'gpg-agent' is started on demand by GnuPG's programs, but it has to be
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;; started explicitly when OpenSSH support is enabled (info "(gnupg) Agent
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;; Options").
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(if ssh-support?
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(let ((endpoint (lambda (name socket)
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#~(endpoint
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(make-socket-address
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AF_UNIX
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(string-append %user-runtime-dir
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"/gnupg/" #$socket))
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#:name #$name
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#:socket-directory-permissions #o700))))
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(list (shepherd-service
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(provision '(gpg-agent ssh-agent))
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(modules '((shepherd support))) ;for '%user-runtime-dir'
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(start #~(make-systemd-constructor
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(list #$(file-append gnupg "/bin/gpg-agent")
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"--supervised" "--enable-ssh-support")
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(list #$(endpoint "ssh" "S.gpg-agent.ssh")
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#$(endpoint "browser" "S.gpg-agent.browser")
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#$(endpoint "extra" "S.gpg-agent.extra")
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;; #$(endpoint "scdaemon" "S.scdaemon")
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#$(endpoint "std" "S.gpg-agent"))))
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(stop #~(make-systemd-destructor))
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(documentation "Start 'gpg-agent', the GnuPG passphrase
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agent, with support for handling OpenSSH material."))))
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'())))
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(define (home-gpg-agent-files config)
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(match-record config <home-gpg-agent-configuration>
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(gnupghome)
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`((,(string-append gnupghome "/gpg-agent.conf")
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,(home-gpg-agent-configuration-file config)))))
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(define (home-gpg-agent-environment-variables config)
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"Return GnuPG environment variables needed for @var{config}."
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(match-record config <home-gpg-agent-configuration>
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(gnupghome)
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(append `(("GNUPGHOME" . ,(string-append "$HOME/" gnupghome)))
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(if (home-gpg-agent-configuration-ssh-support? config)
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`(("SSH_AUTH_SOCK"
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. "$XDG_RUNTIME_DIR/gnupg/S.gpg-agent.ssh"))
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'()))))
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(define home-gpg-agent-service-type
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(service-type
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(name 'home-gpg-agent)
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(extensions
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(list (service-extension home-files-service-type
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home-gpg-agent-files)
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(service-extension home-shepherd-service-type
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home-gpg-agent-shepherd-services)
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(service-extension home-environment-variables-service-type
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home-gpg-agent-environment-variables)))
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(default-value (home-gpg-agent-configuration))
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(description
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"Configure GnuPG's agent, @command{gpg-agent}, which is responsible for
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managing OpenPGP and optionally SSH private keys. When SSH support is
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enabled, @command{gpg-agent} acts as a drop-in replacement for OpenSSH's
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@command{ssh-agent}.")))
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(define-configuration/no-serialization home-parcimonie-configuration
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(parcimonie
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(file-like parcimonie)
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"The parcimonie package to use.")
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(verbose?
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(boolean #f)
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"Provide extra output to the log file.")
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(gnupg-aleady-torified?
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(boolean #f)
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"GnuPG is already configured to use tor and parcimonie won't attempt to use
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tor directly.")
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(refresh-guix-keyrings?
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(boolean #f)
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"Also refresh any Guix keyrings found in the XDG_CONFIG_DIR.")
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(extra-content
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(raw-configuration-string "")
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"Raw content to add to the parcimonie service."))
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(define (home-parcimonie-shepherd-service config)
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"Return a user service to run parcimonie."
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(match-record config <home-parcimonie-configuration>
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(parcimonie verbose? gnupg-aleady-torified?
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refresh-guix-keyrings? extra-content)
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(let ((log-file #~(string-append %user-log-dir "/parcimonie.log")))
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(list (shepherd-service
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(provision '(parcimonie))
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(modules '((shepherd support) ;for '%user-log-dir'
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(guix build utils)
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(srfi srfi-1)))
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(start #~(make-forkexec-constructor
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(cons*
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#$(file-append parcimonie "/bin/parcimonie")
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#$@(if verbose?
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'("--verbose")
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'())
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#$@(if gnupg-aleady-torified?
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'("--gnupg_already_torified")
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'())
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#$@(if (not (string=? extra-content ""))
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(list extra-content)
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'())
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#$@(if refresh-guix-keyrings?
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'((append-map
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(lambda (item)
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(list (string-append "--gnupg_extra_args="
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"--keyring=" item)))
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(find-files
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(string-append (getenv "XDG_CONFIG_HOME") "/guix")
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"^trustedkeys\\.kbx$")))
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'((list))))
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#:log-file #$log-file))
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(stop #~(make-kill-destructor))
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(respawn? #t)
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(documentation "Incrementally refresh gnupg keyring over Tor"))))))
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(define home-parcimonie-service-type
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(service-type
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(name 'home-parcimonie)
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(extensions
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(list (service-extension home-shepherd-service-type
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home-parcimonie-shepherd-service)))
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(default-value (home-parcimonie-configuration))
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(description
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"Incrementally refresh GnuPG keyrings over Tor.")))
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