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;;; Consfigurator -- Lisp declarative configuration management system
;;; Copyright (C) 2021 Sean Whitton <spwhitton@spwhitton.name>
;;; This file 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, or (at your option)
;;; any later version.
;;; This file 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 this program. If not, see <http://www.gnu.org/licenses/>.
(in-package :consfigurator.property.sshd)
(named-readtables:in-readtable :consfigurator)
;;;; Basic configuration
(defproplist installed :posix ()
"Install an OpenSSH server."
(:desc "OpenSSH server installed")
(os:etypecase
(debianlike (apt:installed "openssh-server"))))
(defprop configured :posix (&rest pairs)
"Set key--value pairs in /etc/ssh/sshd_config."
(:desc (format nil "sshd configured ~{~A ~A~^, ~}" pairs))
(:apply
(apply #'file:contains-conf-space "/etc/ssh/sshd_config" pairs)))
(defprop no-passwords :posix ()
"Configure SSH to disallow password logins.
To prevent lockouts, also enables logging in as root with an SSH key, and
refuses to proceed if root has no authorized_keys."
(:desc "SSH passwords disabled")
(:apply
(assert-euid-root)
(unless (and (remote-exists-p ".ssh/authorized_keys")
(plusp (length (readfile ".ssh/authorized_keys"))))
(failed-change "root has no authorized_keys"))
(configured "PermitRootLogin" "without-password"
"PasswordAuthentication" "no")))
;;;; Host keys
(defprop has-host-public-key :posix (type public-key)
"Records an SSH public key of type TYPE as identifying this host."
(:desc #?"Has SSH host key of type ${type}")
(:hostattrs (push-hostattrs 'host-public-key (cons type public-key))))
(defproplist has-host-key :posix (type public-key)
"Installs the host key whose public part is PUBLIC-KEY and is of type TYPE.
The private key is obtained as an item of prerequisite data."
(:desc #?"SSH host key of type ${type} installed")
(has-host-public-key type public-key)
(file:has-content (merge-pathnames (strcat "ssh_host_" type "_key.pub")
#P"/etc/ssh/")
public-key)
(file:host-secret-uploaded (merge-pathnames (strcat "ssh_host_" type "_key")
#P"/etc/ssh/")))
(defun get-host-public-keys (host &key short-hostname)
(let* ((host (preprocess-host host))
(hostname (get-hostname host)))
(cons (format nil "~A~:[~;,~A~]"
hostname (and short-hostname (find #\. hostname))
(car (split-string hostname :separator ".")))
(mapcar #'cdr (get-hostattrs 'host-public-key host)))))
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