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| | ;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2022 muradm <mail@muradm.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 security)
#:use-module (guix gexp)
#:use-module (guix records)
#:use-module (gnu packages admin)
#:use-module (ice-9 format)
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
#:use-module (gnu services)
#:use-module (gnu services shepherd)
#:export (fail2ban-ignore-cache-configuration
fail2ban-jail-filter-configuration
fail2ban-jail-action-configuration
fail2ban-jail-configuration
fail2ban-configuration
fail2ban-service-type
fail2ban-jail-service))
(define (fail2ban-section->string name)
(format #f "[~a]" name))
(define fail2ban-backend->string
(match-lambda
('auto "auto")
('pyinotify "pyinotify")
('gamin "gamin")
('polling "polling")
('systemd "systemd")
(unknown (error (format #f "Unknown fail2ban backend: ~a" unknown)))))
(define fail2ban-log-encoding->string
(match-lambda
('auto "auto")
('utf-8 "utf-8")
('ascii "ascii")
(unknown (error (format #f "Unknown fail2ban log-encoding: ~a" unknown)))))
(define-record-type* <fail2ban-ignore-cache-configuration>
fail2ban-ignore-cache-configuration make-fail2ban-ignore-cache-configuration
fail2ban-ignore-cache-configuration?
(key fail2ban-ignore-cache-configuration-key)
(max-count fail2ban-ignore-cache-configuration-max-count)
(max-time fail2ban-ignore-cache-configuration-max-time))
(define fail2ban-ignore-cache-configuration->string
(match-lambda
(($ <fail2ban-ignore-cache-configuration> key max-count max-time)
(format #f "key=\"~a\", max-count=~d, max-time=~d" key max-count max-time))))
(define-record-type* <fail2ban-jail-filter-configuration>
fail2ban-jail-filter-configuration make-fail2ban-jail-filter-configuration
fail2ban-jail-filter-configuration?
(name fail2ban-jail-filter-configuration-name)
(mode fail2ban-jail-filter-configuration-node
(default *unspecified*)))
(define fail2ban-jail-filter-configuration->string
(match-lambda
(($ <fail2ban-jail-filter-configuration> name mode)
(format #f "~a~a"
name (if (unspecified? mode) "" (format #f "[mode=~a]" mode))))))
(define-record-type* <fail2ban-jail-action-configuration>
fail2ban-jail-action-configuration make-fail2ban-jail-action-configuration
fail2ban-jail-action-configuration?
(name fail2ban-jail-action-configuration-name)
(arguments fail2ban-jail-action-configuration-arguments
(default '())))
(define (fail2ban-arguments->string args)
(let* ((multi-value
(lambda (v)
(format #f "\"~a\"" (string-join (map object->string v) ","))))
(any-value
(lambda (v)
(if (list? v) (multi-value v) v)))
(key-value
(lambda (e)
(format #f "~a=~a" (car e) (any-value (cdr e))))))
(format #f "~a" (string-join (map key-value args) ","))))
(define fail2ban-jail-action-configuration->string
(match-lambda
(($ <fail2ban-jail-action-configuration> name arguments)
(format #f "~a~a"
name (if (null? arguments) ""
(format #f "[~a]"
(fail2ban-arguments->string arguments)))))))
(define-record-type* <fail2ban-jail-configuration>
fail2ban-jail-configuration make-fail2ban-jail-configuration
fail2ban-jail-configuration?
(name fail2ban-jail-configuration-name)
(enabled fail2ban-jail-configuration-enabled
(default *unspecified*))
(backend fail2ban-jail-configuration-backend
(default *unspecified*))
(max-retry fail2ban-jail-configuration-max-retry
(default *unspecified*))
(max-matches fail2ban-jail-configuration-max-matches
(default *unspecified*))
(find-time fail2ban-jail-configuration-find-time
(default *unspecified*))
(ban-time fail2ban-jail-configuration-ban-time
(default *unspecified*))
(ban-time-increment fail2ban-jail-configuration-ban-time-increment
(default *unspecified*))
(ban-time-factor fail2ban-jail-configuration-ban-time-factor
(default *unspecified*))
(ban-time-formula fail2ban-jail-configuration-ban-time-formula
(default *unspecified*))
(ban-time-multipliers fail2ban-jail-configuration-ban-time-multipliers
(default *unspecified*))
(ban-time-maxtime fail2ban-jail-configuration-ban-time-maxtime
(default *unspecified*))
(ban-time-rndtime fail2ban-jail-configuration-ban-time-rndtime
(default *unspecified*))
(ban-time-overalljails fail2ban-jail-configuration-ban-time-overalljails
(default *unspecified*))
(ignore-command fail2ban-jail-configuration-ignore-command
(default *unspecified*))
(ignore-self fail2ban-jail-configuration-ignore-self
(default *unspecified*))
(ignore-ip fail2ban-jail-configuration-ignore-ip
(default '()))
(ignore-cache fail2ban-jail-configuration-ignore-cache
(default *unspecified*))
(filter fail2ban-jail-configuration-filter
(default *unspecified*))
(log-time-zone fail2ban-jail-configuration-log-time-zone
(default *unspecified*))
(log-encoding fail2ban-jail-configuration-log-encoding
(default *unspecified*))
(log-path fail2ban-jail-configuration-log-path
(default *unspecified*))
(action fail2ban-jail-configuration-action
(default '())))
(define fail2ban-jail-configuration->string
(match-lambda
(($ <fail2ban-jail-configuration> name enabled backend
max-retry max-matches
find-time ban-time
ban-time-increment ban-time-factor
ban-time-formula ban-time-multipliers
ban-time-maxtime ban-time-rndtime
ban-time-overalljails
ignore-command ignore-self
ignore-ip ignore-cache
fltr
log-time-zone log-encoding log-path
action)
(string-join
(filter
(lambda (s) (not (unspecified? s)))
(list
(fail2ban-section->string name)
(unless (unspecified? enabled)
(format #f "enabled = ~a"
(if enabled "true" "false")))
(unless (unspecified? backend)
(format #f "backend = ~a"
(fail2ban-backend->string backend)))
(unless (unspecified? max-retry)
(format #f "maxretry = ~d" max-retry))
(unless (unspecified? max-matches)
(format #f "maxmatches = ~d" max-matches))
(unless (unspecified? find-time)
(format #f "findtime = ~a" find-time))
(unless (unspecified? ban-time)
(format #f "bantime = ~a" ban-time))
(unless (unspecified? ban-time-increment)
(format #f "bantime.increment = ~a"
(if ban-time-increment "true" "false")))
(unless (unspecified? ban-time-factor)
(format #f "bantime.factor = ~a" ban-time-factor))
(unless (unspecified? ban-time-formula)
(format #f "bantime.formula = ~a" ban-time-formula))
(unless (unspecified? ban-time-multipliers)
(format #f "bantime.multipliers = ~a" ban-time-multipliers))
(unless (unspecified? ban-time-maxtime)
(format #f "bantime.maxtime = ~a" ban-time-maxtime))
(unless (unspecified? ban-time-rndtime)
(format #f "bantime.rndtime = ~a" ban-time-rndtime))
(unless (unspecified? ban-time-overalljails)
(format #f "bantime.overalljails = ~a"
(if ban-time-overalljails "true" "false")))
(unless (unspecified? ignore-command)
(format #f "ignorecommand = ~a" ignore-command))
(unless (unspecified? ignore-self)
(format #f "ignoreself = ~a"
(if ignore-self "true" "false")))
(unless (null? ignore-ip)
(format #f "ignoreip = ~a" (string-join ignore-ip " ")))
(unless (unspecified? ignore-cache)
(format #f "ignorecache = ~a"
(fail2ban-ignore-cache-configuration->string
ignore-cache)))
(unless (unspecified? fltr)
(format #f "filter = ~a"
(fail2ban-jail-filter-configuration->string fltr)))
(unless (unspecified? log-time-zone)
(format #f "logtimezone = ~a" log-time-zone))
(unless (unspecified? log-encoding)
(format #f "logencoding = ~a"
(fail2ban-log-encoding->string log-encoding)))
(unless (unspecified? log-path)
(format #f "logpath = ~a" log-path))
(unless (null? action)
(format #f "action = ~a"
(string-join
(map fail2ban-jail-action-configuration->string action)
"\n")))))
"\n"))))
(define-record-type* <fail2ban-configuration>
fail2ban-configuration make-fail2ban-configuration
fail2ban-configuration?
(fail2ban fail2ban-configuration-fail2ban
(default fail2ban))
(run-directory fail2ban-configuration-run-directory
(default "/var/run/fail2ban"))
(jails fail2ban-configuration-jails
(default '()))
(extra-jails fail2ban-configuration-extra-jails
(default '()))
(extra-content fail2ban-configuration-extra-content
(default "")))
(define (fail2ban-configuration->string config)
(let* ((jails (fail2ban-configuration-jails config))
(extra-jails (fail2ban-configuration-extra-jails config))
(extra-content (fail2ban-configuration-extra-content config)))
(string-append
(string-join
(map fail2ban-jail-configuration->string
(append jails extra-jails))
"\n")
"\n" extra-content "\n")))
(define (make-fail2ban-configuration-package config)
(let* ((fail2ban (fail2ban-configuration-fail2ban config))
(jail-local
(plain-file "jail.local"
(fail2ban-configuration->string config))))
(computed-file
"fail2ban-configuration"
(with-imported-modules '((guix build utils))
#~(begin
(use-modules (guix build utils))
(let* ((out (ungexp output)))
(mkdir-p (string-append out "/etc/fail2ban"))
(copy-recursively
(string-append #$fail2ban "/etc/fail2ban")
(string-append out "/etc/fail2ban"))
(symlink
#$jail-local
(string-append out "/etc/fail2ban/jail.local"))))))))
(define (fail2ban-shepherd-service config)
(match-record config <fail2ban-configuration>
(fail2ban run-directory)
(let* ((fail2ban-server (file-append fail2ban "/bin/fail2ban-server"))
(pid-file (in-vicinity run-directory "fail2ban.pid"))
(socket-file (in-vicinity run-directory "fail2ban.sock"))
(config-dir (make-fail2ban-configuration-package config))
(config-dir (file-append config-dir "/etc/fail2ban"))
(fail2ban-action
(lambda args
#~(lambda _
(invoke #$fail2ban-server
"-c" #$config-dir
"-p" #$pid-file
"-s" #$socket-file
"-b"
#$@args)))))
;; TODO: Add 'reload' action.
(list (shepherd-service
(provision '(fail2ban))
(documentation "Run the fail2ban daemon.")
(requirement '(user-processes))
(modules `((ice-9 match)
,@%default-modules))
(start (fail2ban-action "start"))
(stop (fail2ban-action "stop")))))))
(define fail2ban-service-type
(service-type (name 'fail2ban)
(extensions
(list (service-extension shepherd-root-service-type
fail2ban-shepherd-service)))
(compose concatenate)
(extend (lambda (config jails)
(fail2ban-configuration
(inherit config)
(jails
(append
(fail2ban-configuration-jails config)
jails)))))
(default-value (fail2ban-configuration))
(description "Run the fail2ban server.")))
(define (fail2ban-jail-service svc-type jail)
(service-type
(inherit svc-type)
(extensions
(append
(service-type-extensions svc-type)
(list (service-extension fail2ban-service-type
(lambda _ (list jail))))))))
|