d43d8377c7
* gnu/services/rsync.scm (rsync-shepherd-service) Wrap rsync command in a least-authority-wrapper. Reviewed-by: Ludovic Courtès <ludo@gnu.org>
315 lines
14 KiB
Scheme
315 lines
14 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2017 Oleg Pykhalov <go.wigust@gmail.com>
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;;; Copyright © 2021, 2023 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2023 Maxim Cournoyer <maxim.cournoyer@gmail.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 services rsync)
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#:use-module ((gnu build linux-container) #:select (%namespaces))
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#:use-module (gnu services)
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#:use-module (gnu services base)
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#:use-module (gnu services shepherd)
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#:autoload (gnu system file-systems) (file-system-mapping)
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#:use-module (gnu system shadow)
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#:use-module (gnu packages admin)
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#:use-module (gnu packages linux)
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#:use-module (gnu packages rsync)
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#:use-module (guix records)
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#:use-module (guix gexp)
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#:use-module (guix diagnostics)
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#:use-module (guix i18n)
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#:use-module (guix least-authority)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-26)
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#:use-module (ice-9 match)
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#:export (rsync-configuration
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rsync-configuration?
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rsync-configuration-modules
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rsync-module
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rsync-module?
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rsync-module-name
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rsync-module-file-name
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rsync-module-comment
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rsync-module-read-only
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rsync-module-timeout
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rsync-service-type))
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;;;; Commentary:
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;;;
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;;; This module implements a service that to run instance of Rsync,
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;;; files synchronization tool.
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;;;
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;;;; Code:
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(define-with-syntax-properties (warn-share-field-deprecation (value properties))
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(unless (unspecified? value)
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(warning (source-properties->location properties)
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(G_ "the 'share-path' and 'share-comment' fields is deprecated, \
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please use 'modules' instead~%")))
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value)
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(define-record-type* <rsync-configuration>
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rsync-configuration
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make-rsync-configuration
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rsync-configuration?
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(package rsync-configuration-package ; file-like
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(default rsync))
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(address rsync-configuration-address ; string | #f
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(default #f))
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(port-number rsync-configuration-port-number ; integer
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(default 873))
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(pid-file rsync-configuration-pid-file ; string
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(default "/var/run/rsyncd/rsyncd.pid"))
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(lock-file rsync-configuration-lock-file ; string
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(default "/var/run/rsyncd/rsyncd.lock"))
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(log-file rsync-configuration-log-file ; string
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(default "/var/log/rsyncd.log"))
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(use-chroot? rsync-configuration-use-chroot? ; boolean
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(sanitize warn-share-field-deprecation)
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(default *unspecified*))
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(modules rsync-configuration-actual-modules ;list of <rsync-module>
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(default %default-modules)) ;TODO: eventually remove default
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(share-path rsync-configuration-share-path ; string
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(sanitize warn-share-field-deprecation)
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(default *unspecified*))
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(share-comment rsync-configuration-share-comment ; string
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(sanitize warn-share-field-deprecation)
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(default *unspecified*))
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(read-only? rsync-configuration-read-only? ; boolean
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(sanitize warn-share-field-deprecation)
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(default *unspecified*))
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(timeout rsync-configuration-timeout ; integer
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(sanitize warn-share-field-deprecation)
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(default *unspecified*))
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(user rsync-configuration-user ; string
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(default "root"))
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(group rsync-configuration-group ; string
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(default "root"))
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(uid rsync-configuration-uid ; string
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(default "rsyncd"))
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(gid rsync-configuration-gid ; string
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(default "rsyncd")))
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;; Rsync "module": a directory exported the rsync protocol.
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(define-record-type* <rsync-module>
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rsync-module make-rsync-module
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rsync-module?
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(name rsync-module-name) ;string
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(file-name rsync-module-file-name) ;string
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(comment rsync-module-comment ;string
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(default ""))
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(read-only? rsync-module-read-only? ;boolean
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(default #t))
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(chroot? rsync-module-chroot? ;boolean
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(default #t))
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(timeout rsync-module-timeout ;integer
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(default 300)))
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(define %default-modules
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;; Default modules, provided for backward compatibility.
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(list (rsync-module (name "files")
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(file-name "/srv/rsyncd")
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(comment "Rsync share")
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(read-only? #f)))) ;yes, that was the default
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(define (rsync-configuration-modules config)
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(match-record config <rsync-configuration>
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(modules
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share-path share-comment use-chroot? read-only? timeout) ;deprecated
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(if (unspecified? share-path)
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(rsync-configuration-actual-modules config)
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(list (rsync-module ;backward compatibility
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(name "files")
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(file-name share-path)
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(comment "Rsync share")
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(chroot?
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(if (unspecified? use-chroot?) #t use-chroot?))
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(read-only?
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(if (unspecified? read-only?) #f read-only?))
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(timeout
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(if (unspecified? timeout) 300 timeout)))))))
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(define (rsync-account config)
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"Return the user accounts and user groups for CONFIG."
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(let ((rsync-user (if (rsync-configuration-uid config)
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(rsync-configuration-uid config)
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(rsync-configuration-user config)))
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(rsync-group (if (rsync-configuration-gid config)
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(rsync-configuration-gid config)
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(rsync-configuration-group config))))
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(list (user-group (name rsync-group) (system? #t))
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(user-account
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(name rsync-user)
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(system? #t)
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(group rsync-group)
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(comment "rsyncd privilege separation user")
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(home-directory (string-append "/var/run/"
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rsync-user))
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(shell (file-append shadow "/sbin/nologin"))))))
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(define (rsync-activation config)
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"Return the activation GEXP for CONFIG."
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(with-imported-modules '((guix build utils))
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#~(begin
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(let ((user (getpw (if #$(rsync-configuration-uid config)
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#$(rsync-configuration-uid config)
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#$(rsync-configuration-user config))))
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(group (getpw (if #$(rsync-configuration-gid config)
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#$(rsync-configuration-gid config)
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#$(rsync-configuration-group config)))))
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(mkdir-p (dirname #$(rsync-configuration-pid-file config)))
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(for-each (lambda (directory)
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(mkdir-p directory)
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(chown directory (passwd:uid user) (group:gid group)))
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'#$(map rsync-module-file-name
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(rsync-configuration-modules config)))))))
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(define (rsync-config-file config)
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;; Return the rsync configuration file corresponding to CONFIG.
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(define (module-config module)
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(match-record module <rsync-module>
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(name file-name comment chroot? read-only? timeout)
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(list "[" name "]\n"
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" path = " file-name "\n"
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" use chroot = " (if chroot? "true" "false") "\n"
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" comment = " comment "\n"
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" read only = " (if read-only? "true" "false") "\n"
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" timeout = " (number->string timeout) "\n")))
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(define modules
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(rsync-configuration-modules config))
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(match-record config <rsync-configuration>
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(package address port-number pid-file lock-file log-file
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user group uid gid)
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(unless (string=? user "root")
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(cond
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((<= port-number 1024)
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(error (string-append "rsync-service: to run on port "
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(number->string port-number)
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", user must be root.")))
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((find rsync-module-chroot? modules)
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(error (string-append "rsync-service: to run in a chroot"
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", user must be root.")))
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(uid
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(error "rsync-service: to use uid, user must be root."))
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(gid
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(error "rsync-service: to use gid, user must be root."))))
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(apply mixed-text-file "rsync.conf"
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"# Generated by 'rsync-service'.\n\n"
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"pid file = " pid-file "\n"
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"lock file = " lock-file "\n"
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"log file = " log-file "\n"
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(if address (string-append "address = " address "\n") "")
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"port = " (number->string port-number) "\n"
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(if uid (string-append "uid = " uid "\n") "")
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"gid = " (if gid gid "nogroup") "\n" ; no group nobody
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"\n\n"
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(append-map module-config modules))))
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(define (rsync-shepherd-service config)
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"Return a <shepherd-service> for rsync with CONFIG."
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;; XXX: Predicates copied from (gnu services ssh).
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(define inetd-style?
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#~(and (defined? 'make-inetd-constructor)
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(not (string=? (@ (shepherd config) Version) "0.9.0"))))
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(define ipv6-support?
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#~(catch 'system-error
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(lambda ()
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(let ((sock (socket AF_INET6 SOCK_STREAM 0)))
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(close-port sock)
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#t))
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(const #f)))
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(define (module->file-system-mapping module)
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"Return the <file-system-mapping> record corresponding to MODULE, an
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<rsync-module> object."
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(match-record module <rsync-module>
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(file-name read-only?)
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(file-system-mapping
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(source file-name)
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(target source)
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(writable? (not read-only?)))))
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(match-record config <rsync-configuration>
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(package log-file modules pid-file port-number user group)
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;; Run the rsync daemon in its own 'mnt' namespace, to guard against
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;; change to mount points it may be serving.
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(let* ((config-file (rsync-config-file config))
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(rsync-command #~(list #$(least-authority-wrapper
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(file-append rsync "/bin/rsync")
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#:name "rsync"
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#:namespaces (fold delq %namespaces
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'(net user))
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#:mappings
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(append (list (file-system-mapping
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(source "/var/run/rsyncd")
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(target source)
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(writable? #t))
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(file-system-mapping
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(source (dirname log-file))
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(target source)
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(writable? #t))
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(file-system-mapping
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(source config-file)
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(target source)))
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(map module->file-system-mapping
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modules)))
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"--config" #$config-file "--daemon")))
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(list (shepherd-service
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(provision '(rsync))
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(documentation "Run rsync daemon.")
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(actions (list (shepherd-configuration-action config-file)))
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(start #~(if #$inetd-style?
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(make-inetd-constructor
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#$rsync-command
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(cons (endpoint
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(make-socket-address AF_INET INADDR_ANY
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#$port-number))
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(if #$ipv6-support?
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(list
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(endpoint
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(make-socket-address AF_INET6 IN6ADDR_ANY
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#$port-number)))
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'()))
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#:user #$user
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#:group #$group)
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(make-forkexec-constructor #$rsync-command
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#:pid-file #$pid-file
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#:user #$user
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#:group #$group)))
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(stop #~(if #$inetd-style?
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(make-inetd-destructor)
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(make-kill-destructor))))))))
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(define rsync-service-type
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(service-type
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(name 'rsync)
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(extensions
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(list (service-extension shepherd-root-service-type rsync-shepherd-service)
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(service-extension account-service-type rsync-account)
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(service-extension activation-service-type rsync-activation)))
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(default-value (rsync-configuration))
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(description
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"Run the rsync file copying tool in daemon mode. This allows remote hosts
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to keep synchronized copies of the files exported by rsync.")))
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