Package: guix-patches;
Reported by: Carlos Durán Domínguez <wurt <at> wurtshell.com>
Date: Fri, 25 Aug 2023 14:50:02 UTC
Severity: normal
Tags: patch
Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):
From: Carlos Durán Domínguez <wurt <at> wurtshell.com> To: guix-patches <at> gnu.org Cc: Carlos Durán Domínguez <wurt <at> wurtshell.com> Subject: [PATCH v2] services: greetd: Add pam-gnupg support. Date: Fri, 25 Aug 2023 16:48:03 +0200
I retry to implement the pam-gnupg module for the greetd system service. It is A PAM module that hands over your login password to gpg-agent. I added de documentation and the insert-before procedure (maybe it needs a better name), to ensure that the pam-gnupg module will be loaded at the end.
* doc/guix.texi: documentation about #:gnupg? option on (greetd-configuration).
* gnu/services.scm (insert-before): new procedure.
* gnu/services/base.scm (greetd-configuration): new option #:gnupg?.
* gnu/services/pam-mount.scm: ensure that pam mount module goes before pam gnupg module.
* gnu/system/pam.scm (pam-gnupg-module?): new procedure and ensure that pam gnupg module is at the end of (unix-pam-service).
---
doc/guix.texi | 9 +++++++++
gnu/services.scm | 11 ++++++++++-
gnu/services/base.scm | 28 ++++++++++++++++++----------
gnu/services/pam-mount.scm | 14 +++++++++-----
gnu/system/pam.scm | 13 ++++++++++---
5 files changed, 56 insertions(+), 19 deletions(-)
diff --git a/doc/guix.texi b/doc/guix.texi
index e8c67b0cd8..1fe38bd971 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -119,6 +119,7 @@ Copyright @copyright{} 2023 Tanguy Le Carrour@*
Copyright @copyright{} 2023 Zheng Junjie@*
Copyright @copyright{} 2023 Brian Cully@*
Copyright @copyright{} 2023 Felix Lechner@*
+Copyright @copyright{} 2023 Carlos Durán Domínguez@*
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3 or
@@ -19666,6 +19667,14 @@ A file-like object containing the ``message of the day''.
Allow empty passwords by default so that first-time users can log in when
the 'root' account has just been created.
+@item @code{gnupg?} (default: @code{#f})
+If enabled, @code{pam-gnupg} will attempt to automatically unlock the
+user's GPG keys with the login password via @code{gpg-agent}. The
+keygrips of all keys to be unlocked should be written to
+@file{~/.pam-gnupg}, and can be queried with @code{gpg -K
+--with-keygrip}. Presetting passphrases must be enabled by adding
+@code{allow-preset-passphrase} in @file{~/.gnupg/gpg-agent.conf}.
+
@item @code{terminals} (default: @code{'()})
List of @code{greetd-terminal-configuration} per terminal for which
@code{greetd} should be started.
diff --git a/gnu/services.scm b/gnu/services.scm
index eb9258977e..118b8973ff 100644
--- a/gnu/services.scm
+++ b/gnu/services.scm
@@ -129,7 +129,8 @@ (define-module (gnu services)
%boot-service
%activation-service
- etc-service) ; deprecated
+ etc-service ; deprecated
+ insert-before)
#:re-export (;; Note: Re-export 'delete' to allow for proper syntax matching
;; in 'modify-services' forms. See
;; <https://debbugs.gnu.org/cgi/bugreport.cgi?bug=26805#16>.
@@ -1248,4 +1249,12 @@ (define-syntax-rule (for-home exp ...)
(syntax-parameterize ((for-home? (identifier-syntax #t)))
exp ...))
+(define (insert-before pred lst1 lst2)
+ "Return a list appending LST2 just before the first element on LST1 that
+ satisfy the predicate PRED."
+ (cond
+ ((null? lst1) lst2)
+ ((pred (car lst1)) (append lst2 lst1))
+ (else (cons (car lst1) (insert-before pred (cdr lst1) lst2)))))
+
;;; services.scm ends here.
diff --git a/gnu/services/base.scm b/gnu/services/base.scm
index b3f2d2e8b8..34aeb4f7d2 100644
--- a/gnu/services/base.scm
+++ b/gnu/services/base.scm
@@ -21,6 +21,7 @@
;;; Copyright © 2022 Justin Veilleux <terramorpha <at> cock.li>
;;; Copyright © 2022 ( <paren <at> disroot.org>
;;; Copyright © 2023 Bruno Victal <mirai <at> makinata.eu>
+;;; Copyright © 2023 Carlos Durán Domínguez <wurt <at> wurtshell.com>
;;;
;;; This file is part of GNU Guix.
;;;
@@ -3227,6 +3228,7 @@ (define-record-type* <greetd-configuration>
greetd-configuration?
(motd greetd-motd (default %default-motd))
(allow-empty-passwords? greetd-allow-empty-passwords? (default #t))
+ (gnupg? greetd-gnupg? (default #f))
(terminals greetd-terminals (default '()))
(greeter-supplementary-groups greetd-greeter-supplementary-groups (default '())))
@@ -3266,25 +3268,31 @@ (define optional-pam-mount
(module (file-append greetd-pam-mount "/lib/security/pam_mount.so"))
(arguments '("disable_interactive"))))
+ (define (optional-pam-mount-transformer pam)
+ (if (member (pam-service-name pam)
+ '("login" "greetd" "su" "slim" "gdm-password"))
+ (pam-service
+ (inherit pam)
+ ;; SLiM could have pam-gnupg module, and pam-mount must be before it.
+ (auth (insert-before pam-gnupg-module?
+ (pam-service-auth pam)
+ (list optional-pam-mount)))
+ (session (insert-before pam-gnupg-module?
+ (pam-service-session pam)
+ (list optional-pam-mount))))
+ pam))
(list
(unix-pam-service "greetd"
#:login-uid? #t
#:allow-empty-passwords?
(greetd-allow-empty-passwords? config)
+ #:gnupg?
+ (greetd-gnupg? config)
#:motd
(greetd-motd config))
(pam-extension
(transformer
- (lambda (pam)
- (if (member (pam-service-name pam)
- '("login" "greetd" "su" "slim" "gdm-password"))
- (pam-service
- (inherit pam)
- (auth (append (pam-service-auth pam)
- (list optional-pam-mount)))
- (session (append (pam-service-session pam)
- (list optional-pam-mount))))
- pam))))))
+ optional-pam-mount-transformer))))
(define (greetd-shepherd-services config)
(map
diff --git a/gnu/services/pam-mount.scm b/gnu/services/pam-mount.scm
index b3a02e82e9..a7470e1fcb 100644
--- a/gnu/services/pam-mount.scm
+++ b/gnu/services/pam-mount.scm
@@ -1,6 +1,7 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2019 Guillaume Le Vaillant <glv <at> posteo.net>
;;; Copyright © 2023 Brian Cully <bjc <at> spork.org>
+;;; Copyright © 2023 Carlos Durán Domínguez <wurt <at> wurtshell.com>
;;;
;;; This file is part of GNU Guix.
;;;
@@ -94,7 +95,8 @@ (define (pam-mount-pam-service config)
(define optional-pam-mount
(pam-entry
(control "optional")
- (module (file-append pam-mount "/lib/security/pam_mount.so"))))
+ (module #~(string-append #$pam-mount "/lib/security/pam_mount.so"))))
+
(list
(pam-extension
(transformer
@@ -103,10 +105,12 @@ (module (file-append pam-mount "/lib/security/pam_mount.so"))))
'("login" "greetd" "su" "slim" "gdm-password" "sddm"))
(pam-service
(inherit pam)
- (auth (append (pam-service-auth pam)
- (list optional-pam-mount)))
- (session (append (pam-service-session pam)
- (list optional-pam-mount))))
+ (auth (insert-before pam-gnupg-module?
+ (pam-service-auth pam)
+ (list optional-pam-mount)))
+ (session (insert-before pam-gnupg-module?
+ (pam-service-session pam)
+ (list optional-pam-mount))))
pam))))))
(define (extend-pam-mount-configuration initial extensions)
diff --git a/gnu/system/pam.scm b/gnu/system/pam.scm
index a035a92e25..445e45c5ef 100644
--- a/gnu/system/pam.scm
+++ b/gnu/system/pam.scm
@@ -1,6 +1,7 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013-2017, 2019-2021 Ludovic Courtès <ludo <at> gnu.org>
;;; Copyright © 2023 Josselin Poiret <dev <at> jpoiret.xyz>
+;;; Copyright © 2023 Carlos Durán Domínguez <wurt <at> wurtshell.com>
;;;
;;; This file is part of GNU Guix.
;;;
@@ -64,7 +65,9 @@ (define-module (gnu system pam)
pam-extension-shepherd-requirements
pam-root-service-type
- pam-root-service))
+ pam-root-service
+
+ pam-gnupg-module?))
;;; Commentary:
;;;
@@ -264,12 +267,12 @@ (module "pam_motd.so")
(control "required")
(module "pam_loginuid.so")))
'())
+ ,env ,unix
,@(if gnupg?
(list (pam-entry
(control "required")
(module (file-append pam-gnupg "/lib/security/pam_gnupg.so"))))
- '())
- ,env ,unix))))))
+ '())))))))
(define (rootok-pam-service command)
"Return a PAM service for COMMAND such that 'root' does not need to
@@ -454,4 +457,8 @@ (define* (pam-root-service base #:key (transformers '()) (shepherd-requirements
(transformers transformers)
(shepherd-requirements shepherd-requirements))))
+(define (pam-gnupg-module? name)
+ "Return `#t' if NAME is the path to the pam-gnupg module, `#f' otherwise."
+ (equal? (pam-entry-module name)
+ (file-append pam-gnupg "/lib/security/pam_gnupg.so")))
--
2.41.0
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Copyright (C) 1999 Darren O. Benham,
1997,2003 nCipher Corporation Ltd,
1994-97 Ian Jackson.