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;;; SPDX-License-Identifier: CC0-1.0
;;;
;;; Copyright © 2023, 2024 Wojtek Kosior <koszko@koszko.org>
(define-module (gnu services ca)
#:use-module ((srfi srfi-1) #:select (concatenate))
#:use-module ((guix records) #:select (define-record-type* match-record))
#:use-module ((guix gexp) #:select (gexp file-append))
#:use-module ((gnu services) #:select
(service-extension activation-service-type service-type))
#:use-module ((gnu packages tls) #:select (openssl))
#:export (snakeoil-service-type
snakeoil-configuration
snakeoil-configuration?
snakeoil-cert-configuration))
(define-record-type* <snakeoil-cert-configuration> snakeoil-cert-configuration
make-snakeoil-cert-configuration snakeoil-cert-configuration?
(name snakeoil-cert-configuration-name
(default #f))
(domains snakeoil-cert-configuration-domains
(default '()))
(key-group-owner snakeoil-cert-configuration-key-group-owner
(default #f)))
(define-record-type* <snakeoil-configuration> snakeoil-configuration
make-snakeoil-configuration snakeoil-configuration?
(openssl snakeoil-configuration-openssl
(default openssl))
(owner snakeoil-configuration-owner
(default "root"))
(group-owner snakeoil-configuration-group-owner
(default #f))
(rsa-key-size snakeoil-configuration-rsa-key-size
(default 4096))
(certificates snakeoil-configuration-certificates
(default '())))
(define (snakeoil-activation config)
(match-record config <snakeoil-configuration>
(openssl owner group-owner rsa-key-size certificates)
#~(begin
(use-modules (ice-9 format)
(ice-9 textual-ports))
(define openssl
#$(file-append openssl "/bin/openssl"))
(define pwnam
(getpw #$owner))
(define grnam
(and=> #$group-owner getgr))
(define (chown-file filename)
(chown filename (passwd:uid pwnam) (or (and=> grnam group:gid) -1)))
(define (generate-private-key path)
(let ((initial-umask (umask))
(tmp-path (string-append path ".tmp.pem")))
(umask #o027)
(system* openssl "genrsa" "-out" tmp-path
#$(number->string rsa-key-size))
(rename-file tmp-path path)
(umask initial-umask)))
(mkdir-p "/etc/snakeoil/certs")
(unless (false-if-exception
(stat "/etc/snakeoil/private/key.pem"))
(mkdir-p "/etc/snakeoil/private/")
(generate-private-key "/etc/snakeoil/private/key.pem"))
(unless (false-if-exception
(stat "/etc/snakeoil/root-cert.pem"))
;; Self-sign a local certificate authority.
(system* openssl "req"
"-x509" "-new" "-nodes" "-sha256"
"-days" (number->string (* 20 365))
"-out" "/etc/snakeoil/root-cert.pem"
"-key" "/etc/snakeoil/private/key.pem"
"-subj" "/CN=snakeoil-root"))
(chown-file "/etc/snakeoil")
(chown-file "/etc/snakeoil/certs")
(chown-file "/etc/snakeoil/private")
(chown-file "/etc/snakeoil/private/key.pem")
(chown-file "/etc/snakeoil/root-cert.pem")
(define (issue-cert cert-name domains key-group-owner)
(let* ((cert-name* (or cert-name (car domains)))
(cert-dir (format #f "/etc/snakeoil/certs/~a" cert-name*))
(tmp-dir (format #f "/etc/snakeoil/certs-tmp/~a" cert-name*))
(cert-path (format #f "~a/cert.pem" tmp-dir))
(chain-link-path (format #f "~a/chain.pem" tmp-dir))
(key-path (format #f "~a/privkey.pem" tmp-dir))
(fullchain-path (format #f "~a/fullchain.pem" tmp-dir))
(csr-path (format #f "~a/csr.pem" tmp-dir)))
(unless (false-if-exception (stat cert-dir))
(system* "rm" "-rf" tmp-dir)
(mkdir-p tmp-dir)
(generate-private-key key-path)
(system* openssl "req"
"-new" "-nodes" "-out" csr-path
"-key" key-path
"-subj" (format #f "/CN=~a" (car domains))
"-addext" (format #f "subjectAltName=~{DNS:~a~^,~}"
domains))
(system* openssl "x509"
"-req" "-sha256" "-CAcreateserial"
"-days" (number->string (* 20 365))
"-copy_extensions=copyall"
"-in" csr-path
"-CA" "/etc/snakeoil/root-cert.pem"
"-CAkey" "/etc/snakeoil/private/key.pem"
"-out" cert-path "-days" (number->string (* 20 365)))
(symlink "../../../snakeoil/root-cert.pem" chain-link-path)
;; Concatenate cert.pem and chain.pem into fullchain.pem.
(with-output-to-file fullchain-path
(lambda _
(for-each (lambda (part)
(call-with-input-file part
(compose display get-string-all)))
(list cert-path chain-link-path))))
(delete-file csr-path)
(map chown-file
(list tmp-dir cert-path fullchain-path))
(when key-group-owner
(chown key-path -1 (if (integer? key-group-owner)
key-group-owner
(group:gid (getgr key-group-owner))))
(chmod key-path #o640))
(rename-file tmp-dir cert-dir))))
(map issue-cert
'#$(map snakeoil-cert-configuration-name certificates)
'#$(map snakeoil-cert-configuration-domains certificates)
'#$(map snakeoil-cert-configuration-key-group-owner
certificates)))))
(define snakeoil-service-type
(service-type
(name 'snakeoil)
(extensions
(list (service-extension activation-service-type snakeoil-activation)))
(compose concatenate)
(extend (lambda (config extra-certificates)
(snakeoil-configuration
(inherit config)
(certificates (append
(snakeoil-configuration-certificates config)
extra-certificates)))))
(default-value (snakeoil-configuration))
(description "Generate self-issued TLS certificates.")))
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