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416 lines
16 KiB
Scheme
416 lines
16 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2022 muradm <mail@muradm.net>
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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 security)
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#:use-module (gnu packages admin)
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#:use-module (gnu services)
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#:use-module (gnu services configuration)
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#:use-module (gnu services shepherd)
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#:use-module (guix gexp)
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#:use-module (guix packages)
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#:use-module (guix records)
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#:use-module (guix ui)
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#:use-module (ice-9 format)
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#:use-module (ice-9 match)
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#:use-module (srfi srfi-1)
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#:export (fail2ban-configuration
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fail2ban-ignore-cache-configuration
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fail2ban-jail-action-configuration
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fail2ban-jail-configuration
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fail2ban-jail-filter-configuration
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fail2ban-jail-service
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fail2ban-service-type))
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(define-configuration/no-serialization fail2ban-ignore-cache-configuration
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(key string "Cache key.")
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(max-count integer "Cache size.")
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(max-time integer "Cache time."))
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(define serialize-fail2ban-ignore-cache-configuration
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(match-lambda
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(($ <fail2ban-ignore-cache-configuration> _ key max-count max-time)
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(format #f "key=\"~a\", max-count=~d, max-time=~d"
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key max-count max-time))))
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(define-maybe/no-serialization string)
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(define-configuration/no-serialization fail2ban-jail-filter-configuration
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(name string "Filter to use.")
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(mode maybe-string "Mode for filter."))
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(define serialize-fail2ban-jail-filter-configuration
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(match-lambda
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(($ <fail2ban-jail-filter-configuration> _ name mode)
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(format #f "~a~@[[mode=~a]~]" name (maybe-value mode)))))
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(define (argument? a)
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(and (pair? a)
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(string? (car a))
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(or (string? (cdr a))
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(list-of-strings? (cdr a)))))
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(define list-of-arguments? (list-of argument?))
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(define-configuration/no-serialization fail2ban-jail-action-configuration
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(name string "Action name.")
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(arguments (list-of-arguments '()) "Action arguments."))
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(define list-of-fail2ban-jail-actions?
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(list-of fail2ban-jail-action-configuration?))
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(define (serialize-fail2ban-jail-action-configuration-arguments args)
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(let* ((multi-value
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(lambda (v)
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(format #f "~a" (string-join v ","))))
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(any-value
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(lambda (v)
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(if (list? v) (string-append "\"" (multi-value v) "\"") v)))
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(key-value
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(lambda (e)
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(format #f "~a=~a" (car e) (any-value (cdr e))))))
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(format #f "~a" (string-join (map key-value args) ","))))
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(define serialize-fail2ban-jail-action-configuration
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(match-lambda
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(($ <fail2ban-jail-action-configuration> _ name arguments)
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(format
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#f "~a~a"
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name
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(if (null? arguments) ""
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(format
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#f "[~a]"
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(serialize-fail2ban-jail-action-configuration-arguments
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arguments)))))))
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(define fail2ban-backend->string
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(match-lambda
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('auto "auto")
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('pyinotify "pyinotify")
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('gamin "gamin")
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('polling "polling")
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('systemd "systemd")
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(unknown
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(leave (G_ "fail2ban: '~a' is not a supported backend~%") unknown))))
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(define fail2ban-log-encoding->string
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(match-lambda
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('auto "auto")
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('utf-8 "utf-8")
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('ascii "ascii")
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(unknown
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(leave (G_ "fail2ban: '~a' is not a supported log encoding~%") unknown))))
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(define (fail2ban-jail-configuration-serialize-field-name name)
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(cond ((symbol? name)
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(fail2ban-jail-configuration-serialize-field-name
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(symbol->string name)))
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((string-suffix? "?" name)
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(fail2ban-jail-configuration-serialize-field-name
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(string-drop-right name 1)))
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((string-prefix? "ban-time-" name)
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(fail2ban-jail-configuration-serialize-field-name
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(string-append "bantime." (substring name 9))))
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((string-contains name "-")
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(fail2ban-jail-configuration-serialize-field-name
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(string-filter (lambda (c) (not (equal? c #\-))) name)))
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(else name)))
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(define (fail2ban-jail-configuration-serialize-string field-name value)
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#~(string-append
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#$(fail2ban-jail-configuration-serialize-field-name field-name)
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" = " #$value "\n"))
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(define (fail2ban-jail-configuration-serialize-integer field-name value)
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(fail2ban-jail-configuration-serialize-string
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field-name (number->string value)))
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(define (fail2ban-jail-configuration-serialize-boolean field-name value)
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(fail2ban-jail-configuration-serialize-string
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field-name (if value "true" "false")))
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(define (fail2ban-jail-configuration-serialize-backend field-name value)
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(if (maybe-value-set? value)
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(fail2ban-jail-configuration-serialize-string
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field-name (fail2ban-backend->string value))
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""))
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(define (fail2ban-jail-configuration-serialize-fail2ban-ignore-cache-configuration field-name value)
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(fail2ban-jail-configuration-serialize-string
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field-name (serialize-fail2ban-ignore-cache-configuration value)))
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(define (fail2ban-jail-configuration-serialize-fail2ban-jail-filter-configuration field-name value)
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(fail2ban-jail-configuration-serialize-string
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field-name (serialize-fail2ban-jail-filter-configuration value)))
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(define (fail2ban-jail-configuration-serialize-log-encoding field-name value)
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(if (maybe-value-set? value)
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(fail2ban-jail-configuration-serialize-string
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field-name (fail2ban-log-encoding->string value))
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""))
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(define (fail2ban-jail-configuration-serialize-list-of-strings field-name value)
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(if (null? value)
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""
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(fail2ban-jail-configuration-serialize-string
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field-name (string-join value " "))))
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(define (fail2ban-jail-configuration-serialize-list-of-fail2ban-jail-actions field-name value)
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(if (null? value)
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""
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(fail2ban-jail-configuration-serialize-string
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field-name (string-join
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(map serialize-fail2ban-jail-action-configuration value) "\n"))))
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(define (fail2ban-jail-configuration-serialize-symbol field-name value)
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(fail2ban-jail-configuration-serialize-string field-name (symbol->string value)))
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(define (fail2ban-jail-configuration-serialize-extra-content field-name value)
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(if (maybe-value-set? value)
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(string-append "\n" value "\n")
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""))
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(define-maybe integer (prefix fail2ban-jail-configuration-))
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(define-maybe string (prefix fail2ban-jail-configuration-))
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(define-maybe boolean (prefix fail2ban-jail-configuration-))
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(define-maybe symbol (prefix fail2ban-jail-configuration-))
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(define-maybe fail2ban-ignore-cache-configuration (prefix fail2ban-jail-configuration-))
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(define-maybe fail2ban-jail-filter-configuration (prefix fail2ban-jail-configuration-))
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(define-configuration fail2ban-jail-configuration
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(name
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string
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"Required name of this jail configuration."
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empty-serializer)
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(enabled?
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(boolean #t)
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"Whether this jail is enabled.")
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(backend
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maybe-symbol
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"Backend to use to detect changes in the @code{log-path}. The default is
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'auto. To consult the defaults of the jail configuration, refer to the
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@file{/etc/fail2ban/jail.conf} file of the @code{fail2ban} package."
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fail2ban-jail-configuration-serialize-backend)
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(max-retry
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maybe-integer
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"The number of failures before a host get banned
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(e.g. @code{(max-retry 5)}).")
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(max-matches
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maybe-integer
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"The number of matches stored in ticket (resolvable via
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tag @code{<matches>}) in action.")
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(find-time
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maybe-string
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"The time window during which the maximum retry count must be reached for
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an IP address to be banned. A host is banned if it has generated
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@code{max-retry} during the last @code{find-time}
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seconds (e.g. @code{(find-time \"10m\")}). It can be provided in seconds or
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using Fail2Ban's \"time abbreviation format\", as described in @command{man 5
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jail.conf}.")
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(ban-time
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maybe-string
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"The duration, in seconds or time abbreviated format, that a ban should last.
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(e.g. @code{(ban-time \"10m\")}).")
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(ban-time-increment?
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maybe-boolean
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"Whether to consider past bans to compute increases to the default ban time
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of a specific IP address.")
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(ban-time-factor
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maybe-string
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"The coefficient to use to compute an exponentially growing ban time.")
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(ban-time-formula
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maybe-string
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"This is the formula used to calculate the next value of a ban time.")
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(ban-time-multipliers
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maybe-string
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"Used to calculate next value of ban time instead of formula.")
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(ban-time-max-time
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maybe-string
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"The maximum number of seconds a ban should last.")
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(ban-time-rnd-time
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maybe-string
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"The maximum number of seconds a randomized ban time should last. This can
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be useful to stop ``clever'' botnets calculating the exact time an IP address
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can be unbanned again.")
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(ban-time-overall-jails?
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maybe-boolean
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"When true, it specifies the search of an IP address in the database should
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be made across all jails. Otherwise, only the current jail of the ban IP
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address is considered.")
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(ignore-self?
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maybe-boolean
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"Never ban the local machine's own IP address.")
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(ignore-ip
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(list-of-strings '())
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"A list of IP addresses, CIDR masks or DNS hosts to ignore.
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@code{fail2ban} will not ban a host which matches an address in this list.")
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(ignore-cache
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maybe-fail2ban-ignore-cache-configuration
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"Provide cache parameters for the ignore failure check.")
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(filter
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maybe-fail2ban-jail-filter-configuration
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"The filter to use by the jail, specified via a
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@code{<fail2ban-jail-filter-configuration>} object. By default, jails have
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names matching their filter name.")
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(log-time-zone
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maybe-string
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"The default time zone for log lines that do not have one.")
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(log-encoding
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maybe-symbol
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"The encoding of the log files handled by the jail.
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Possible values are: @code{'ascii}, @code{'utf-8} and @code{'auto}."
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fail2ban-jail-configuration-serialize-log-encoding)
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(log-path
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(list-of-strings '())
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"The file names of the log files to be monitored.")
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(action
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(list-of-fail2ban-jail-actions '())
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"A list of @code{<fail2ban-jail-action-configuration>}.")
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(extra-content
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maybe-string
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"Extra content for the jail configuration."
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fail2ban-jail-configuration-serialize-extra-content)
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(prefix fail2ban-jail-configuration-))
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(define list-of-fail2ban-jail-configurations?
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(list-of fail2ban-jail-configuration?))
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(define (serialize-fail2ban-jail-configuration config)
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#~(string-append
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#$(format #f "[~a]\n" (fail2ban-jail-configuration-name config))
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#$(serialize-configuration
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config fail2ban-jail-configuration-fields)))
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(define-configuration/no-serialization fail2ban-configuration
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(fail2ban
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(package fail2ban)
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"The @code{fail2ban} package to use. It is used for both binaries and as
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base default configuration that is to be extended with
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@code{<fail2ban-jail-configuration>} objects.")
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(run-directory
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(string "/var/run/fail2ban")
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"The state directory for the @code{fail2ban} daemon.")
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(jails
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(list-of-fail2ban-jail-configurations '())
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"Instances of @code{<fail2ban-jail-configuration>} collected from
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extensions.")
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(extra-jails
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(list-of-fail2ban-jail-configurations '())
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"Instances of @code{<fail2ban-jail-configuration>} explicitly provided.")
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(extra-content
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maybe-string
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"Extra raw content to add to the end of the @file{jail.local} file."))
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(define (serialize-fail2ban-configuration config)
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(let* ((jails (fail2ban-configuration-jails config))
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(extra-jails (fail2ban-configuration-extra-jails config))
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(extra-content (fail2ban-configuration-extra-content config)))
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(interpose
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(append (map serialize-fail2ban-jail-configuration
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(append jails extra-jails))
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(list (if (maybe-value-set? extra-content)
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extra-content
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""))))))
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(define (config->fail2ban-etc-directory config)
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(let* ((fail2ban (fail2ban-configuration-fail2ban config))
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(jail-local (apply mixed-text-file "jail.local"
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(serialize-fail2ban-configuration config))))
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(directory-union
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"fail2ban-configuration"
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(list (computed-file
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"etc-fail2ban"
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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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(let ((etc (string-append #$output "/etc")))
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(mkdir-p etc)
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(symlink #$(file-append fail2ban "/etc/fail2ban")
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(string-append etc "/fail2ban"))))))
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(computed-file
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"etc-fail2ban-jail.local"
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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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(define etc/fail2ban (string-append #$output
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"/etc/fail2ban"))
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(mkdir-p etc/fail2ban)
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(symlink #$jail-local (string-append etc/fail2ban
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"/jail.local")))))))))
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(define (fail2ban-shepherd-service config)
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(match-record config <fail2ban-configuration>
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(fail2ban run-directory)
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(let* ((fail2ban-server (file-append fail2ban "/bin/fail2ban-server"))
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(pid-file (in-vicinity run-directory "fail2ban.pid"))
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(socket-file (in-vicinity run-directory "fail2ban.sock"))
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(config-dir (file-append (config->fail2ban-etc-directory config)
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"/etc/fail2ban"))
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(fail2ban-action (lambda args
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#~(lambda _
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(invoke #$fail2ban-server
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"-c" #$config-dir
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"-p" #$pid-file
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"-s" #$socket-file
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"-b"
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#$@args)))))
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;; TODO: Add 'reload' action.
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(list (shepherd-service
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(provision '(fail2ban))
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(documentation "Run the fail2ban daemon.")
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(requirement '(user-processes))
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(modules `((ice-9 match)
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,@%default-modules))
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(start (fail2ban-action "start"))
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(stop (fail2ban-action "stop")))))))
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(define fail2ban-service-type
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(service-type (name 'fail2ban)
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(extensions
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(list (service-extension shepherd-root-service-type
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fail2ban-shepherd-service)))
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(compose concatenate)
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(extend (lambda (config jails)
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(fail2ban-configuration
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(inherit config)
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(jails (append (fail2ban-configuration-jails config)
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jails)))))
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(default-value (fail2ban-configuration))
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(description "Run the fail2ban server.")))
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(define (fail2ban-jail-service svc-type jail)
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"Convenience procedure to add a fail2ban service extension to SVC-TYPE, a
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<service-type> object. The fail2ban extension is specified by JAIL, a
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<fail2ban-jail-configuration> object."
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(service-type
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(inherit svc-type)
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(extensions
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(append (service-type-extensions svc-type)
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(list (service-extension fail2ban-service-type
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(lambda _ (list jail))))))))
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;;;
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;;; Documentation generation.
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;;;
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(define (generate-doc)
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(configuration->documentation 'fail2ban-configuration)
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(configuration->documentation 'fail2ban-ignore-cache-configuration)
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(configuration->documentation 'fail2ban-jail-action-configuration)
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(configuration->documentation 'fail2ban-jail-configuration)
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(configuration->documentation 'fail2ban-jail-filter-configuration))
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