380 lines
14 KiB
Scheme
380 lines
14 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2013, 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2016 Alex Griffin <a@ajgrf.com>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (gnu system shadow)
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#:use-module (guix records)
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#:use-module (guix gexp)
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#:use-module (guix store)
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#:use-module (guix modules)
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#:use-module (guix sets)
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#:use-module (guix ui)
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#:use-module (gnu services)
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#:use-module (gnu services shepherd)
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#:use-module ((gnu system file-systems)
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#:select (%tty-gid))
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#:use-module ((gnu packages admin)
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#:select (shadow))
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#:use-module (gnu packages bash)
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#:use-module (gnu packages guile-wm)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-26)
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#:use-module (srfi srfi-34)
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#:use-module (srfi srfi-35)
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#:export (user-account
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user-account?
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user-account-name
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user-account-password
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user-account-uid
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user-account-group
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user-account-supplementary-groups
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user-account-comment
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user-account-home-directory
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user-account-create-home-directory?
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user-account-shell
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user-account-system?
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user-group
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user-group?
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user-group-name
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user-group-password
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user-group-id
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user-group-system?
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default-skeletons
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skeleton-directory
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%base-groups
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%base-user-accounts
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account-service-type
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account-service))
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;;; Commentary:
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;;;
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;;; Utilities for configuring the Shadow tool suite ('login', 'passwd', etc.)
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;;;
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;;; Code:
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(define-record-type* <user-account>
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user-account make-user-account
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user-account?
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(name user-account-name)
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(password user-account-password (default #f))
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(uid user-account-uid (default #f))
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(group user-account-group) ; number | string
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(supplementary-groups user-account-supplementary-groups
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(default '())) ; list of strings
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(comment user-account-comment (default ""))
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(home-directory user-account-home-directory)
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(create-home-directory? user-account-create-home-directory? ;Boolean
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(default #t))
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(shell user-account-shell ; gexp
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(default (file-append bash "/bin/bash")))
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(system? user-account-system? ; Boolean
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(default #f)))
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(define-record-type* <user-group>
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user-group make-user-group
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user-group?
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(name user-group-name)
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(password user-group-password (default #f))
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(id user-group-id (default #f))
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(system? user-group-system? ; Boolean
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(default #f)))
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(define %base-groups
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;; Default set of groups.
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(let-syntax ((system-group (syntax-rules ()
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((_ args ...)
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(user-group (system? #t) args ...)))))
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(list (system-group (name "root") (id 0))
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(system-group (name "wheel")) ; root-like users
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(system-group (name "users")) ; normal users
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(system-group (name "nogroup")) ; for daemons etc.
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;; The following groups are conventionally used by things like udev to
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;; control access to hardware devices.
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(system-group (name "tty") (id %tty-gid))
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(system-group (name "dialout"))
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(system-group (name "kmem"))
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(system-group (name "input")) ; input devices, from udev
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(system-group (name "video"))
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(system-group (name "audio"))
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(system-group (name "netdev")) ; used in avahi-dbus.conf
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(system-group (name "lp"))
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(system-group (name "disk"))
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(system-group (name "floppy"))
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(system-group (name "cdrom"))
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(system-group (name "tape"))
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(system-group (name "kvm"))))) ; for /dev/kvm
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(define %base-user-accounts
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;; List of standard user accounts. Note that "root" is a special case, so
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;; it's not listed here.
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(list (user-account
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(name "nobody")
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(uid 65534)
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(group "nogroup")
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(shell (file-append shadow "/sbin/nologin"))
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(home-directory "/nonexistent")
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(create-home-directory? #f)
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(system? #t))))
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(define (default-skeletons)
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"Return the default skeleton files for /etc/skel. These files are copied by
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'useradd' in the home directory of newly created user accounts."
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(define copy-guile-wm
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(with-imported-modules '((guix build utils))
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#~(begin
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(use-modules (guix build utils))
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(copy-file (car (find-files #+guile-wm "wm-init-sample.scm"))
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#$output))))
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(let ((profile (plain-file "bash_profile" "\
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# Honor per-interactive-shell startup file
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if [ -f ~/.bashrc ]; then . ~/.bashrc; fi\n"))
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(bashrc (plain-file "bashrc" "\
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# Bash initialization for interactive non-login shells and
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# for remote shells (info \"(bash) Bash Startup Files\").
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# Export 'SHELL' to child processes. Programs such as 'screen'
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# honor it and otherwise use /bin/sh.
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export SHELL
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if [ -n \"$SSH_CLIENT\" -a -z \"`type -P cat`\" ]
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then
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# We are being invoked from a non-interactive SSH session
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# (as in \"ssh host command\") but 'cat' cannot be found
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# in $PATH. Source /etc/profile so we get $PATH and other
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# essential variables.
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source /etc/profile
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fi
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# Adjust the prompt depending on whether we're in 'guix environment'.
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if [ -n \"$GUIX_ENVIRONMENT\" ]
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then
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PS1='\\u@\\h \\w [env]\\$ '
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else
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PS1='\\u@\\h \\w\\$ '
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fi
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alias ls='ls -p --color'
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alias ll='ls -l'
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alias grep='grep --color'\n"))
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(zlogin (plain-file "zlogin" "\
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# Honor system-wide environment variables
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source /etc/profile\n"))
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(guile-wm (computed-file "guile-wm" copy-guile-wm))
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(xdefaults (plain-file "Xdefaults" "\
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XTerm*utf8: always
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XTerm*metaSendsEscape: true\n"))
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(gdbinit (plain-file "gdbinit" "\
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# Tell GDB where to look for separate debugging files.
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set debug-file-directory ~/.guix-profile/lib/debug\n")))
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`((".bash_profile" ,profile)
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(".bashrc" ,bashrc)
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(".zlogin" ,zlogin)
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(".Xdefaults" ,xdefaults)
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(".guile" ,(plain-file "dot-guile"
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(string-append
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"(use-modules (ice-9 readline))\n\n"
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";; Enable completion at the REPL.\n"
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"(activate-readline)\n")))
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(".guile-wm" ,guile-wm)
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(".gdbinit" ,gdbinit))))
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(define (skeleton-directory skeletons)
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"Return a directory containing SKELETONS, a list of name/derivation tuples."
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(computed-file "skel"
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(with-imported-modules '((guix build utils))
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#~(begin
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(use-modules (ice-9 match)
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(guix build utils))
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(mkdir #$output)
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(chdir #$output)
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;; Note: copy the skeletons instead of symlinking
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;; them like 'file-union' does, because 'useradd'
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;; would just copy the symlinks as is.
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(for-each (match-lambda
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((target source)
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(copy-recursively source target)))
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'#$skeletons)
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#t))))
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(define (assert-valid-users/groups users groups)
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"Raise an error if USERS refer to groups not listed in GROUPS."
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(let ((groups (list->set (map user-group-name groups))))
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(define (validate-supplementary-group user group)
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(unless (set-contains? groups group)
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(raise (condition
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(&message
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(message
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(format #f (G_ "supplementary group '~a' \
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of user '~a' is undeclared")
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group
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(user-account-name user))))))))
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(for-each (lambda (user)
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(unless (set-contains? groups (user-account-group user))
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(raise (condition
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(&message
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(message
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(format #f (G_ "primary group '~a' \
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of user '~a' is undeclared")
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(user-account-group user)
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(user-account-name user)))))))
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(for-each (cut validate-supplementary-group user <>)
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(user-account-supplementary-groups user)))
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users)))
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;;;
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;;; Service.
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;;;
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(define (user-group->gexp group)
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"Turn GROUP, a <user-group> object, into a list-valued gexp suitable for
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'active-groups'."
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#~(list #$(user-group-name group)
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#$(user-group-password group)
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#$(user-group-id group)
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#$(user-group-system? group)))
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(define (user-account->gexp account)
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"Turn ACCOUNT, a <user-account> object, into a list-valued gexp suitable for
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'activate-users'."
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#~`(#$(user-account-name account)
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#$(user-account-uid account)
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#$(user-account-group account)
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#$(user-account-supplementary-groups account)
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#$(user-account-comment account)
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#$(user-account-home-directory account)
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#$(user-account-create-home-directory? account)
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,#$(user-account-shell account) ; this one is a gexp
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#$(user-account-password account)
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#$(user-account-system? account)))
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(define (account-activation accounts+groups)
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"Return a gexp that activates ACCOUNTS+GROUPS, a list of <user-account> and
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<user-group> objects. Raise an error if a user account refers to a undefined
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group."
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(define accounts
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(filter user-account? accounts+groups))
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(define user-specs
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(map user-account->gexp accounts))
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(define groups
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(filter user-group? accounts+groups))
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(define group-specs
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(map user-group->gexp groups))
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(assert-valid-users/groups accounts groups)
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;; Add users and user groups.
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#~(begin
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(setenv "PATH"
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(string-append #$(@ (gnu packages admin) shadow) "/sbin"))
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(activate-users+groups (list #$@user-specs)
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(list #$@group-specs))))
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(define (account-shepherd-service accounts+groups)
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"Return a Shepherd service that creates the home directories for the user
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accounts among ACCOUNTS+GROUPS."
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(define accounts
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(filter user-account? accounts+groups))
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;; Create home directories only once 'file-systems' is up. This makes sure
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;; they are created in the right place if /home lives on a separate
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;; partition.
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;;
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;; XXX: We arrange for this service to stop right after it's done its job so
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;; that 'guix system reconfigure' knows that it can reload it fearlessly
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;; (and thus create new home directories). The cost of this hack is that
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;; there's a small window during which first-time logins could happen before
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;; the home directory has been created.
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(list (shepherd-service
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(requirement '(file-systems))
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(provision '(user-homes))
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(modules '((gnu build activation)))
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(start (with-imported-modules (source-module-closure
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'((gnu build activation)))
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#~(lambda ()
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(activate-user-home
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(list #$@(map user-account->gexp accounts)))
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#f))) ;stop
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(stop #~(const #f))
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(respawn? #f)
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(documentation "Create user home directories."))))
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(define (shells-file shells)
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"Return a file-like object that builds a shell list for use as /etc/shells
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based on SHELLS. /etc/shells is used by xterm, polkit, and other programs."
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(computed-file "shells"
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#~(begin
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(use-modules (srfi srfi-1))
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(define shells
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(delete-duplicates (list #$@shells)))
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(call-with-output-file #$output
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(lambda (port)
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(display "\
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/bin/sh
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/run/current-system/profile/bin/sh
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/run/current-system/profile/bin/bash\n" port)
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(for-each (lambda (shell)
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(display shell port)
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(newline port))
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shells))))))
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(define (etc-files arguments)
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"Filter out among ARGUMENTS things corresponding to skeletons, and return
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the /etc/skel directory for those."
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(let ((skels (filter pair? arguments))
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(users (filter user-account? arguments)))
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`(("skel" ,(skeleton-directory skels))
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("shells" ,(shells-file (map user-account-shell users))))))
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(define account-service-type
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(service-type (name 'account)
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;; Concatenate <user-account>, <user-group>, and skeleton
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;; lists.
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(compose concatenate)
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(extend append)
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(extensions
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(list (service-extension activation-service-type
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account-activation)
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(service-extension shepherd-root-service-type
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account-shepherd-service)
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(service-extension etc-service-type
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etc-files)))))
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(define (account-service accounts+groups skeletons)
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"Return a <service> that takes care of user accounts and user groups, with
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ACCOUNTS+GROUPS as its initial list of accounts and groups."
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(service account-service-type
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(append skeletons accounts+groups)))
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;;; shadow.scm ends here
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