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authorLudovic Courtès <ludo@gnu.org>2022-06-11 18:39:02 +0200
committerLudovic Courtès <ludo@gnu.org>2022-06-17 23:39:32 +0200
commit7f208f68dea828fe02718ca8ce81d5975136cff8 (patch)
tree94f18e16f3238fd9089454ffb7e4db1ba47ea515 /gnu/home
parent3e24393e8727984239a48136848fa089f483b7d6 (diff)
home: Add OpenSSH service.
* gnu/home/services/ssh.scm: New file. * gnu/local.mk (GNU_SYSTEM_MODULES): Add it. * po/guix/POTFILES.in: Add it. * doc/guix.texi (Secure Shell): New section.
Diffstat (limited to 'gnu/home')
-rw-r--r--gnu/home/services/ssh.scm254
1 files changed, 254 insertions, 0 deletions
diff --git a/gnu/home/services/ssh.scm b/gnu/home/services/ssh.scm
new file mode 100644
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--- /dev/null
+++ b/gnu/home/services/ssh.scm
@@ -0,0 +1,254 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2022 Ludovic Courtès <ludo@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 utils)
+ #:select (object->camel-case-string))
+ #:autoload (gnu packages base) (glibc-utf8-locales)
+ #: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
+
+ 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))
+
+(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 *unspecified* AF_INET AF_INET6)))
+
+(define (serialize-address-family field family)
+ (if (unspecified? 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
+ 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), or
+@code{*unspecified*} (allowing 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))))