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-*- mode: org; coding: utf-8; -*-

#+TITLE: Hacking GNU Guix and Its Incredible Distro

Copyright © 2012, 2013, 2014, 2016, 2017, 2019 Ludovic Courtès <ludo@gnu.org>
Copyright © 2015, 2017 Mathieu Lirzin <mthl@gnu.org>
Copyright © 2017 Leo Famulari <leo@famulari.name>
Copyright © 2017 Arun Isaac <arunisaac@systemreboot.net>

  Copying and distribution of this file, with or without modification,
  are permitted in any medium without royalty provided the copyright
  notice and this notice are preserved.

* Contributing

See the manual for useful hacking information, either by running

  info -f doc/guix.info "Contributing"

or by checking the [[https://guix.gnu.org/manual/devel/en/html_node/Contributing.html][web copy of the manual]].
d='n47' href='#n47'>47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2021 Brice Waegeneire <brice@waegenei.re>
;;; Copyright © 2022 Tobias Geerinckx-Rice <me@tobias.gr>
;;;
;;; 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 system privilege)
  #:use-module (guix records)
  #:export (privileged-program
            privileged-program?
            privileged-program-program
            privileged-program-setuid?
            privileged-program-setgid?
            privileged-program-user
            privileged-program-group
            privileged-program-capabilities

            file-like->setuid-program))

;;; Commentary:
;;;
;;; Data structures representing privileged programs: binaries with additional
;;; permissions such as setuid/setgid, or POSIX capabilities.  This is meant to
;;; be used both on the host side and at run time--e.g., in activation snippets.
;;;
;;; Code:

(define-record-type* <privileged-program>
  privileged-program make-privileged-program
  privileged-program?
  ;; File name of the program to assign elevated privileges.
  (program       privileged-program-program) ;file-like
  ;; Whether to set the setuid (‘set user ID’) bit.
  (setuid?       privileged-program-setuid? ;boolean
                 (default #f))
  ;; Whether to set the setgid (‘set group ID’) bit.
  (setgid?       privileged-program-setgid? ;boolean
                 (default #f))
  ;; The user name or ID this should be set to (defaults to root's).
  (user          privileged-program-user ;integer or string
                 (default 0))
  ;; The group name or ID we want to set this to (defaults to root's).
  (group         privileged-program-group ;integer or string
                 (default 0))
  ;; POSIX capabilities in cap_from_text(3) form (defaults to #f: none).
  (capabilities  privileged-program-capabilities ;string or #f
                 (default #f)))

(define (file-like->setuid-program program)
  "Simple wrapper to facilitate MAPping over a list of file-like objects and
make them setuid, a pattern just common enough to justify a special helper."
  (privileged-program (program program)
                      (setuid? #t)))