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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2019 Guillaume Le Vaillant <glv@posteo.net>
;;;
;;; 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 services pam-mount)
#:use-module (gnu packages admin)
#:use-module (gnu services)
#:use-module (gnu services configuration)
#:use-module (gnu system pam)
#:use-module (guix gexp)
#:use-module (guix records)
#:export (pam-mount-configuration
pam-mount-configuration?
pam-mount-service-type))
(define %pam-mount-default-configuration
`((debug (@ (enable "0")))
(mntoptions (@ (allow ,(string-join
'("nosuid" "nodev" "loop"
"encryption" "fsck" "nonempty"
"allow_root" "allow_other")
","))))
(mntoptions (@ (require "nosuid,nodev")))
(logout (@ (wait "0")
(hup "0")
(term "no")
(kill "no")))
(mkmountpoint (@ (enable "1")
(remove "true")))))
(define (make-pam-mount-configuration-file config)
(computed-file
"pam_mount.conf.xml"
#~(begin
(use-modules (sxml simple))
(call-with-output-file #$output
(lambda (port)
(sxml->xml
'(*TOP*
(*PI* xml "version='1.0' encoding='utf-8'")
(pam_mount
#$@(pam-mount-configuration-rules config)
(pmvarrun
#$(file-append pam-mount
"/sbin/pmvarrun -u '%(USER)' -o '%(OPERATION)'"))
(cryptmount
#$(file-append pam-mount
(string-append
"/sbin/mount.crypt"
" '%(if %(CIPHER),-ocipher=%(CIPHER))'"
" '%(if %(FSKEYCIPHER),"
"-ofsk_cipher=%(FSKEYCIPHER))'"
" '%(if %(FSKEYHASH),-ofsk_hash=%(FSKEYHASH))'"
" '%(if %(FSKEYPATH),-okeyfile=%(FSKEYPATH))'"
" '%(if %(OPTIONS),-o%(OPTIONS))'"
" '%(VOLUME)' '%(MNTPT)'")))
(cryptumount
#$(file-append pam-mount "/sbin/umount.crypt '%(MNTPT)'"))))
port))))))
(define-record-type* <pam-mount-configuration>
pam-mount-configuration
make-pam-mount-configuration
pam-mount-configuration?
(rules pam-mount-configuration-rules
(default %pam-mount-default-configuration)))
(define (pam-mount-etc-service config)
`(("security/pam_mount.conf.xml"
,(make-pam-mount-configuration-file config))))
(define (pam-mount-pam-service config)
(define optional-pam-mount
(pam-entry
(control "optional")
(module #~(string-append #$pam-mount "/lib/security/pam_mount.so"))))
(list
(pam-extension
(transformer
(lambda (pam)
(if (member (pam-service-name pam)
'("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))))
pam))))))
(define pam-mount-service-type
(service-type
(name 'pam-mount)
(extensions (list (service-extension etc-service-type
pam-mount-etc-service)
(service-extension pam-root-service-type
pam-mount-pam-service)))
(default-value (pam-mount-configuration))
(description "Activate PAM-Mount support. It allows mounting volumes for
specific users when they log in.")))
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