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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2019 Guillaume Le Vaillant <glv@posteo.net>
;;; Copyright © 2023 Brian Cully <bjc@spork.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 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)
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
#:export (pam-mount-configuration
pam-mount-configuration?
pam-mount-service-type
pam-mount-volume
pam-mount-volume?
pam-mount-volume-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 (file-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 (extend-pam-mount-configuration initial extensions)
"Extends INITIAL with EXTENSIONS."
(pam-mount-configuration (rules (append (pam-mount-configuration-rules
initial) extensions))))
(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)))
(compose concatenate)
(extend extend-pam-mount-configuration)
(default-value (pam-mount-configuration))
(description "Activate PAM-Mount support. It allows mounting volumes for
specific users when they log in.")))
(define (field-name->tag field-name)
"Convert FIELD-NAME to its tag used by the configuration XML."
(match field-name
('user-name 'user)
('user-id 'uid)
('primary-group 'pgrp)
('group-id 'gid)
('secondary-group 'sgrp)
('file-system-type 'fstype)
('no-mount-as-root? 'noroot)
('file-name 'path)
('mount-point 'mountpoint)
('ssh? 'ssh)
('file-system-key-cipher 'fskeycipher)
('file-system-key-hash 'fskeyhash)
('file-system-key-file-name 'fskeypath)
(_ field-name)))
(define-maybe string)
(define (serialize-string field-name value)
(list (field-name->tag field-name) value))
(define (integer-or-range? value)
(match value
((start . end) (and (integer? start)
(integer? end)))
(_ (number? value))))
(define-maybe integer-or-range)
(define (serialize-integer-or-range field-name value)
(let ((value-string (match value
((start . end) (format #f "~a-~a" start end))
(_ (number->string value)))))
(list (field-name->tag field-name) value-string)))
(define-maybe boolean)
(define (serialize-boolean field-name value)
(let ((value-string (if value "1" "0")))
(list (field-name->tag field-name) value-string)))
(define-configuration pam-mount-volume
(user-name maybe-string "User name to match.")
(user-id maybe-integer-or-range
"User ID, or range of user IDs, in the form of @code{(start . end)} to\nmatch.")
(primary-group maybe-string "Primary group name to match.")
(group-id maybe-integer-or-range
"Group ID, or range of group IDs, in the form of @code{(start . end)} to\nmatch.")
(secondary-group maybe-string
"Match users who belong to this group name as either a primary or secondary\ngroup.")
(file-system-type maybe-string "File system type of volume being mounted.")
(no-mount-as-root? maybe-boolean
"Do not use super user privileges to mount this volume.")
(server maybe-string "Remote server this volume resides on.")
(file-name maybe-string "Location of the volume to be mounted.")
(mount-point maybe-string
"Where to mount the volume in the local file system.")
(options maybe-string "Options to pass to the underlying mount program.")
(ssh? maybe-boolean "Whether to pass the login password to SSH.")
(cipher maybe-string "Cryptsetup cipher named used by volume.")
(file-system-key-cipher maybe-string
"Cipher name used by the target volume.")
(file-system-key-hash maybe-string
"SSL hash name used by the target volume.")
(file-system-key-file-name maybe-string
"File name for the file system key used by the target volume."))
(define (pam-mount-volume->sxml volume)
;; Convert a list of configuration fields into an SXML-compatible attribute
;; list.
(define xml-attrs
(filter-map (lambda (field)
(let* ((accessor (configuration-field-getter field))
(value (accessor volume)))
(and (not (eq? value %unset-value))
(list (field-name->tag (configuration-field-name
field)) value))))
pam-mount-volume-fields))
`(volume (@ ,@xml-attrs)))
(define (pam-mount-volume-rules volumes)
(map pam-mount-volume->sxml volumes))
(define pam-mount-volume-service-type
(service-type (name 'pam-mount-volume)
(extensions (list (service-extension pam-mount-service-type
pam-mount-volume-rules)))
(compose concatenate)
(extend append)
(default-value '())
(description
"Mount remote volumes such as CIFS shares @i{via}
@acronym{PAM, Pluggable Authentication Modules} when logging in, using login
credentials.")))
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