2714c9ef2d
* gnu/home/services/ssh.scm (home-ssh-agent-environment-variables): New procedure. (home-ssh-agent-service-type): Use it as ahome-environment-service type extension. * doc/guix.texi (Secure Shell): Remove advice about, and examples of setting SSH_AUTH_SOCK.
312 lines
12 KiB
Scheme
312 lines
12 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
|
||
;;; Copyright © 2022 Ludovic Courtès <ludo@gnu.org>
|
||
;;; Copyright © 2023 Janneke Nieuwenhuizen <janneke@gnu.org>
|
||
;;;
|
||
;;; 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 home services ssh)
|
||
#:use-module (guix gexp)
|
||
#:use-module (guix records)
|
||
#:use-module (guix diagnostics)
|
||
#:use-module (guix i18n)
|
||
#:use-module (gnu services)
|
||
#:use-module (gnu services configuration)
|
||
#:use-module (guix modules)
|
||
#:use-module (gnu home services)
|
||
#:use-module (gnu home services shepherd)
|
||
#:use-module ((gnu home services utils)
|
||
#:select (object->camel-case-string))
|
||
#:autoload (gnu packages base) (glibc-utf8-locales)
|
||
#:use-module (gnu packages ssh)
|
||
#:use-module (srfi srfi-1)
|
||
#:use-module (srfi srfi-34)
|
||
#:use-module (srfi srfi-35)
|
||
#:use-module (ice-9 match)
|
||
#:export (home-openssh-configuration
|
||
home-openssh-configuration-authorized-keys
|
||
home-openssh-configuration-known-hosts
|
||
home-openssh-configuration-hosts
|
||
home-ssh-agent-configuration
|
||
|
||
openssh-host
|
||
openssh-host-host-name
|
||
openssh-host-identity-file
|
||
openssh-host-name
|
||
openssh-host-port
|
||
openssh-host-user
|
||
openssh-host-forward-x11?
|
||
openssh-host-forward-x11-trusted?
|
||
openssh-host-forward-agent?
|
||
openssh-host-compression?
|
||
openssh-host-proxy-command
|
||
openssh-host-host-key-algorithms
|
||
openssh-host-accepted-key-types
|
||
openssh-host-extra-content
|
||
|
||
home-openssh-service-type
|
||
home-ssh-agent-service-type))
|
||
|
||
(define (serialize-field-name name)
|
||
(match name
|
||
('accepted-key-types "PubkeyAcceptedKeyTypes")
|
||
(_
|
||
(let ((name (let ((str (symbol->string name)))
|
||
(if (string-suffix? "?" str)
|
||
(string->symbol (string-drop-right str 1))
|
||
name))))
|
||
(object->camel-case-string name 'upper)))))
|
||
|
||
(define (serialize-string field value)
|
||
(string-append " " (serialize-field-name field)
|
||
" " value "\n"))
|
||
|
||
(define (address-family? obj)
|
||
(memv obj (list AF_INET AF_INET6)))
|
||
|
||
(define-maybe address-family)
|
||
|
||
(define (serialize-address-family field family)
|
||
(if (maybe-value-set? family)
|
||
(string-append " " (serialize-field-name field) " "
|
||
(cond ((= family AF_INET) "inet")
|
||
((= family AF_INET6) "inet6")
|
||
;; The 'else' branch is unreachable.
|
||
(else (raise (condition (&error)))))
|
||
"\n")
|
||
""))
|
||
|
||
(define (natural-number? obj)
|
||
(and (integer? obj) (exact? obj) (> obj 0)))
|
||
|
||
(define (serialize-natural-number field value)
|
||
(string-append " " (serialize-field-name field) " "
|
||
(number->string value) "\n"))
|
||
|
||
(define (serialize-boolean field value)
|
||
(string-append " " (serialize-field-name field) " "
|
||
(if value "yes" "no") "\n"))
|
||
|
||
(define-maybe string)
|
||
(define-maybe natural-number)
|
||
|
||
(define (serialize-raw-configuration-string field value)
|
||
(string-append value "\n"))
|
||
(define raw-configuration-string? string?)
|
||
|
||
(define (string-list? lst)
|
||
(and (pair? lst) (every string? lst)))
|
||
(define (serialize-string-list field lst)
|
||
(string-append " " (serialize-field-name field) " "
|
||
(string-join lst ",") "\n"))
|
||
|
||
(define-maybe string-list)
|
||
|
||
(define-configuration openssh-host
|
||
(name
|
||
(string)
|
||
"Name of this host declaration.")
|
||
(host-name
|
||
maybe-string
|
||
"Host name---e.g., @code{\"foo.example.org\"} or @code{\"192.168.1.2\"}.")
|
||
(address-family
|
||
maybe-address-family
|
||
"Address family to use when connecting to this host: one of
|
||
@code{AF_INET} (for IPv4 only), @code{AF_INET6} (for IPv6 only).
|
||
Additionally, the field can be left unset to allow any address family.")
|
||
(identity-file
|
||
maybe-string
|
||
"The identity file to use---e.g.,
|
||
@code{\"/home/charlie/.ssh/id_ed25519\"}.")
|
||
(port
|
||
maybe-natural-number
|
||
"TCP port number to connect to.")
|
||
(user
|
||
maybe-string
|
||
"User name on the remote host.")
|
||
(forward-x11?
|
||
(boolean #f)
|
||
"Whether to forward remote client connections to the local X11 graphical
|
||
display.")
|
||
(forward-x11-trusted?
|
||
(boolean #f)
|
||
"Whether remote X11 clients have full access to the original X11 graphical
|
||
display.")
|
||
(forward-agent?
|
||
(boolean #f)
|
||
"Whether the authentication agent (if any) is forwarded to the remote
|
||
machine.")
|
||
(compression?
|
||
(boolean #f)
|
||
"Whether to compress data in transit.")
|
||
(proxy-command
|
||
maybe-string
|
||
"The command to use to connect to the server. As an example, a command
|
||
to connect via an HTTP proxy at 192.0.2.0 would be: @code{\"nc -X
|
||
connect -x 192.0.2.0:8080 %h %p\"}.")
|
||
(host-key-algorithms
|
||
maybe-string-list
|
||
"The list of accepted host key algorithms---e.g.,
|
||
@code{'(\"ssh-ed25519\")}.")
|
||
(accepted-key-types
|
||
maybe-string-list
|
||
"The list of accepted user public key types.")
|
||
(extra-content
|
||
(raw-configuration-string "")
|
||
"Extra content appended as-is to this @code{Host} block in
|
||
@file{~/.ssh/config}."))
|
||
|
||
(define (serialize-openssh-host config)
|
||
(define (openssh-host-name-field? field)
|
||
(eq? (configuration-field-name field) 'name))
|
||
|
||
(string-append
|
||
"Host " (openssh-host-name config) "\n"
|
||
(string-concatenate
|
||
(map (lambda (field)
|
||
((configuration-field-serializer field)
|
||
(configuration-field-name field)
|
||
((configuration-field-getter field) config)))
|
||
(remove openssh-host-name-field?
|
||
openssh-host-fields)))))
|
||
|
||
(define-record-type* <home-openssh-configuration>
|
||
home-openssh-configuration make-home-openssh-configuration
|
||
home-openssh-configuration?
|
||
(authorized-keys home-openssh-configuration-authorized-keys ;list of file-like
|
||
(default '()))
|
||
(known-hosts home-openssh-configuration-known-hosts ;unspec | list of file-like
|
||
(default *unspecified*))
|
||
(hosts home-openssh-configuration-hosts ;list of <openssh-host>
|
||
(default '())))
|
||
|
||
(define (openssh-configuration->string config)
|
||
(string-join (map serialize-openssh-host
|
||
(home-openssh-configuration-hosts config))
|
||
"\n"))
|
||
|
||
(define* (file-join name files #:optional (delimiter " "))
|
||
"Return a file in the store called @var{name} that is the concatenation
|
||
of all the file-like objects listed in @var{files}, with @var{delimited}
|
||
inserted after each of them."
|
||
(computed-file name
|
||
(with-imported-modules '((guix build utils))
|
||
#~(begin
|
||
(use-modules (guix build utils))
|
||
|
||
;; Support non-ASCII file names.
|
||
(setenv "GUIX_LOCPATH"
|
||
#+(file-append glibc-utf8-locales
|
||
"/lib/locale"))
|
||
(setlocale LC_ALL "en_US.utf8")
|
||
|
||
(call-with-output-file #$output
|
||
(lambda (output)
|
||
(for-each (lambda (file)
|
||
(call-with-input-file file
|
||
(lambda (input)
|
||
(dump-port input output)))
|
||
(display #$delimiter output))
|
||
'#$files)))))))
|
||
|
||
(define (openssh-configuration-files config)
|
||
(let ((config (plain-file "ssh.conf"
|
||
(openssh-configuration->string config)))
|
||
(known-hosts (home-openssh-configuration-known-hosts config))
|
||
(authorized-keys (file-join
|
||
"authorized_keys"
|
||
(home-openssh-configuration-authorized-keys config)
|
||
"\n")))
|
||
`((".ssh/authorized_keys" ,authorized-keys)
|
||
,@(if (unspecified? known-hosts)
|
||
'()
|
||
`((".ssh/known_hosts"
|
||
,(file-join "known_hosts" known-hosts "\n"))))
|
||
(".ssh/config" ,config))))
|
||
|
||
(define openssh-activation
|
||
(with-imported-modules (source-module-closure
|
||
'((gnu build activation)))
|
||
#~(begin
|
||
(use-modules (gnu build activation))
|
||
|
||
;; Make sure ~/.ssh is #o700.
|
||
(let* ((home (getenv "HOME"))
|
||
(dot-ssh (string-append home "/.ssh")))
|
||
(mkdir-p/perms dot-ssh (getpw (getuid)) #o700)))))
|
||
|
||
(define home-openssh-service-type
|
||
(service-type
|
||
(name 'home-openssh)
|
||
(extensions
|
||
(list (service-extension home-files-service-type
|
||
openssh-configuration-files)
|
||
(service-extension home-activation-service-type
|
||
(const openssh-activation))))
|
||
(description "Configure the OpenSSH @acronym{SSH, secure shell} client
|
||
by providing a @file{~/.ssh/config} file, which is honored by the OpenSSH
|
||
client,@command{ssh}, and by other tools such as @command{guix deploy}.")
|
||
(default-value (home-openssh-configuration))))
|
||
|
||
|
||
;;;
|
||
;;; Ssh-agent.
|
||
;;;
|
||
(define-record-type* <home-ssh-agent-configuration>
|
||
home-ssh-agent-configuration make-home-ssh-agent-configuration
|
||
home-ssh-agent-configuration?
|
||
(openssh home-ssh-agent-openssh ;file-like
|
||
(default openssh))
|
||
(socket-directory home-ssh-agent-socket-directory ;string
|
||
(default #~(string-append %user-runtime-dir "/ssh-agent")))
|
||
(extra-options home-ssh-agent-extra-options ;list of string
|
||
(default '())))
|
||
|
||
(define (home-ssh-agent-services config)
|
||
"Return a <shepherd-service> for an ssh-agent with CONFIG."
|
||
(match-record config <home-ssh-agent-configuration>
|
||
(openssh socket-directory extra-options)
|
||
(let* ((ssh-agent (file-append openssh "/bin/ssh-agent"))
|
||
(socket-file #~(string-append #$socket-directory "/socket"))
|
||
(command #~`(#$ssh-agent
|
||
"-D" "-a" ,#$socket-file
|
||
#$@extra-options))
|
||
(log-file #~(string-append %user-log-dir "/ssh-agent.log")))
|
||
(list (shepherd-service
|
||
(documentation "Run the ssh-agent.")
|
||
(provision '(ssh-agent))
|
||
(modules '((shepherd support))) ;for '%user-runtime-dir', etc.
|
||
(start #~(lambda _
|
||
(unless (file-exists? #$socket-directory)
|
||
(mkdir-p #$socket-directory)
|
||
(chmod #$socket-directory #o700))
|
||
(fork+exec-command #$command #:log-file #$log-file)))
|
||
(stop #~(make-kill-destructor)))))))
|
||
|
||
(define (home-ssh-agent-environment-variables config)
|
||
'(("SSH_AUTH_SOCK"
|
||
. "${SSH_AUTH_SOCK-${XDG_RUNTIME_DIR-$HOME/.cache}/ssh-agent/socket}")))
|
||
|
||
(define home-ssh-agent-service-type
|
||
(service-type
|
||
(name 'home-ssh-agent)
|
||
(default-value (home-ssh-agent-configuration))
|
||
(extensions
|
||
(list (service-extension home-shepherd-service-type
|
||
home-ssh-agent-services)
|
||
(service-extension home-environment-variables-service-type
|
||
home-ssh-agent-environment-variables)))
|
||
(description
|
||
"Install and configure @command{ssh-agent} as a Shepherd service.")))
|