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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2023 Ludovic Courtès <ludo@gnu.org>
+;;;
+;;; 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 home services gnupg)
+ #:use-module (guix gexp)
+ #:use-module ((guix records) #:select (match-record))
+ #:use-module (gnu services)
+ #:use-module (gnu services configuration)
+ #:use-module (gnu home services)
+ #:use-module (gnu home services shepherd)
+ #:autoload (gnu packages gnupg) (gnupg pinentry)
+ #:export (home-gpg-agent-configuration
+ home-gpg-agent-configuration?
+ home-gpg-agent-configuration-gnupg
+ home-gpg-agent-configuration-pinentry-program
+ home-gpg-agent-configuration-ssh-support?
+ home-gpg-agent-configuration-default-cache-ttl
+ home-gpg-agent-configuration-max-cache-ttl
+ home-gpg-agent-configuration-max-cache-ttl-ssh
+ home-gpg-agent-configuration-extra-content
+
+ home-gpg-agent-service-type))
+
+(define raw-configuration-string? string?)
+
+;; Configuration of 'gpg-agent'.
+(define-configuration/no-serialization home-gpg-agent-configuration
+ (gnupg
+ (file-like gnupg)
+ "The GnuPG package to use.")
+ (pinentry-program
+ (file-like (file-append pinentry "/bin/pinentry-curses"))
+ "Pinentry program to use. Pinentry is a small user interface that
+@command{gpg-agent} delegates to anytime it needs user input for a passphrase
+or @acronym{PIN, personal identification number} (@pxref{Top,,, pinentry,
+Using the PIN-Entry}).")
+ (ssh-support?
+ (boolean #f)
+ "Whether to enable @acronym{SSH, secure shell} support. When true,
+@command{gpg-agent} acts as a drop-in replacement for OpenSSH's
+@command{ssh-agent} program, taking care of OpenSSH secret keys and directing
+passphrase requests to the chosen Pinentry program.")
+ (default-cache-ttl
+ (integer 600)
+ "Time a cache entry is valid, in seconds.")
+ (max-cache-ttl
+ (integer 7200)
+ "Maximum time a cache entry is valid, in seconds. After this time a cache
+entry will be expired even if it has been accessed recently.")
+ (default-cache-ttl-ssh
+ (integer 1800)
+ "Time a cache entry for SSH keys is valid, in seconds.")
+ (max-cache-ttl-ssh
+ (integer 7200)
+ "Maximum time a cache entry for SSH keys is valid, in seconds.")
+ (extra-content
+ (raw-configuration-string "")
+ "Raw content to add to the end of @file{~/.gnupg/gpg-agent.conf}."))
+
+(define (home-gpg-agent-configuration-file config)
+ "Return the @file{gpg-agent.conf} file for @var{config}."
+ (match-record config <home-gpg-agent-configuration>
+ (pinentry-program default-cache-ttl max-cache-ttl
+ default-cache-ttl-ssh max-cache-ttl-ssh
+ extra-content)
+ (mixed-text-file "gpg-agent.conf"
+ "pinentry-program " pinentry-program "\n"
+ "default-cache-ttl "
+ (number->string default-cache-ttl) "\n"
+ "max-cache-ttl "
+ (number->string max-cache-ttl) "\n"
+ "default-cache-ttl-ssh "
+ (number->string default-cache-ttl-ssh) "\n"
+ "max-cache-ttl-ssh "
+ (number->string max-cache-ttl-ssh) "\n"
+ extra-content)))
+
+(define (home-gpg-agent-shepherd-services config)
+ "Return the possibly-empty list of Shepherd services for @var{config}."
+ (match-record config <home-gpg-agent-configuration>
+ (gnupg ssh-support?)
+ ;; 'gpg-agent' is started on demand by GnuPG's programs, but it has to be
+ ;; started explicitly when OpenSSH support is enabled (info "(gnupg) Agent
+ ;; Options").
+ (if ssh-support?
+ (let ((endpoint (lambda (name socket)
+ #~(endpoint
+ (make-socket-address
+ AF_UNIX
+ (string-append %user-runtime-dir
+ "/gnupg/" #$socket))
+ #:name #$name
+ #:socket-directory-permissions #o700))))
+ (list (shepherd-service
+ (provision '(gpg-agent ssh-agent))
+ (modules '((shepherd support))) ;for '%user-runtime-dir'
+ (start #~(make-systemd-constructor
+ (list #$(file-append gnupg "/bin/gpg-agent")
+ "--supervised" "--enable-ssh-support")
+ (list #$(endpoint "ssh" "S.gpg-agent.ssh")
+ #$(endpoint "browser" "S.gpg-agent.browser")
+ #$(endpoint "extra" "S.gpg-agent.extra")
+ ;; #$(endpoint "scdaemon" "S.scdaemon")
+ #$(endpoint "std" "S.gpg-agent"))))
+ (stop #~(make-systemd-destructor))
+ (documentation "Start 'gpg-agent', the GnuPG passphrase
+agent, with support for handling OpenSSH material."))))
+ '())))
+
+(define (home-gpg-agent-files config)
+ `((".gnupg/gpg-agent.conf" ,(home-gpg-agent-configuration-file config))))
+
+(define (home-gpg-agent-environment-variables config)
+ "Return GnuPG environment variables needed for @var{config}."
+ (if (home-gpg-agent-configuration-ssh-support? config)
+ `(("SSH_AUTH_SOCK"
+ . "$XDG_RUNTIME_DIR/gnupg/S.gpg-agent.ssh"))
+ '()))
+
+(define home-gpg-agent-service-type
+ (service-type
+ (name 'home-gpg-agent)
+ (extensions
+ (list (service-extension home-files-service-type
+ home-gpg-agent-files)
+ (service-extension home-shepherd-service-type
+ home-gpg-agent-shepherd-services)
+ (service-extension home-environment-variables-service-type
+ home-gpg-agent-environment-variables)))
+ (default-value (home-gpg-agent-configuration))
+ (description
+ "Configure GnuPG's agent, @command{gpg-agent}, which is responsible for
+managing OpenPGP and optionally SSH private keys. When SSH support is
+enabled, @command{gpg-agent} acts as a drop-in replacement for OpenSSH's
+@command{ssh-agent}.")))