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services: certbot: Create self-signed certificates before certbot runs.

* gnu/services/certbot.scm (<certificate-configuration>): Add
start-self-signed? field.
(generate-certificate-gexp): New procedure.
(certbot-activation): Generate self-signed certificates when
start-self-signed? is #t.
* doc/guix.texi (Certificate services): Document start-self-signed?.

Change-Id: Icfd85ae0c3e29324acbcde6ba283546cf0e27a1d
Signed-off-by: Clément Lassieur <clement@lassieur.org>
master
Carlo Zancanaro 2024-01-31 11:46:23 +00:00 committed by Clément Lassieur
parent a2b1ef903b
commit fc0ec9a3cc
No known key found for this signature in database
GPG Key ID: 89F96D4808F359C7
2 changed files with 65 additions and 3 deletions

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@ -32690,6 +32690,12 @@ certificates and keys; the shell variable @code{$RENEWED_DOMAINS} will
contain a space-delimited list of renewed certificate domains (for
example, @samp{"example.com www.example.com"}.
@item @code{start-self-signed?} (default: @code{#t})
Whether to generate an initial self-signed certificate during system
activation. This option is particularly useful to allow @code{nginx} to
start before @code{certbot} has run, because @code{certbot} relies on
@code{nginx} running to perform HTTP challenges.
@end table
@end deftp

View File

@ -35,6 +35,7 @@
#:use-module (guix records)
#:use-module (guix gexp)
#:use-module (srfi srfi-1)
#:use-module (ice-9 format)
#:use-module (ice-9 match)
#:export (certbot-service-type
certbot-configuration
@ -64,7 +65,9 @@
(cleanup-hook certificate-cleanup-hook
(default #f))
(deploy-hook certificate-configuration-deploy-hook
(default #f)))
(default #f))
(start-self-signed? certificate-configuration-start-self-signed?
(default #t)))
(define-record-type* <certbot-configuration>
certbot-configuration make-certbot-configuration
@ -91,7 +94,10 @@
(define (certbot-deploy-hook name deploy-hook-script)
"Returns a gexp which creates symlinks for privkey.pem and fullchain.pem
from /etc/certs/NAME to /etc/letsenctypt/live/NAME. If DEPLOY-HOOK-SCRIPT is
not #f then it is run after the symlinks have been created."
not #f then it is run after the symlinks have been created. This wrapping is
necessary for certificates with start-self-signed? set to #t, as it will
overwrite the initial self-signed certificates upon the first successful
deploy."
(program-file
(string-append name "-deploy-hook")
(with-imported-modules '((guix build utils))
@ -108,7 +114,8 @@ not #f then it is run after the symlinks have been created."
"/etc/letsencrypt/live/" name "/fullchain.pem")
#$(string-append "/etc/certs/" name "/fullchain.pem.new"))
;; Rename over the top of the old ones, if there are any.
;; Rename over the top of the old ones, just in case they were the
;; original self-signed certificates.
(rename-file #$(string-append "/etc/certs/" name "/privkey.pem.new")
#$(string-append "/etc/certs/" name "/privkey.pem"))
(rename-file #$(string-append "/etc/certs/" name "/fullchain.pem.new")
@ -184,6 +191,47 @@ not #f then it is run after the symlinks have been created."
#~(job '(next-minute-from (next-hour '(0 12)) (list (random 60)))
#$(certbot-command config))))
(define (generate-certificate-gexp certbot-cert-directory rsa-key-size)
(match-lambda
(($ <certificate-configuration> name (primary-domain other-domains ...)
challenge
csr authentication-hook
cleanup-hook deploy-hook)
(let (;; Arbitrary default subject, with just the
;; right domain filled in. These values don't
;; have any real significance.
(subject (string-append
"/C=US/ST=Oregon/L=Portland/O=Company Name/OU=Org/CN="
primary-domain))
(alt-names (if (null? other-domains)
#f
(format #f "subjectAltName=~{DNS:~a~^,~}"
other-domains)))
(directory (string-append "/etc/certs/" (or name primary-domain))))
#~(when (not (file-exists? #$directory))
;; We generate self-signed certificates in /etc/certs/{domain},
;; because certbot is very sensitive to its directory
;; structure. It refuses to write over the top of existing files,
;; so we need to use a directory outside of its control.
;;
;; These certificates are overwritten by the certbot deploy hook
;; the first time it successfully obtains a letsencrypt-signed
;; certificate.
(mkdir-p #$directory)
(chmod #$directory #o755)
(invoke #$(file-append openssl "/bin/openssl")
"req" "-x509"
"-newkey" #$(string-append "rsa:" (or rsa-key-size "4096"))
"-keyout" #$(string-append directory "/privkey.pem")
"-out" #$(string-append directory "/fullchain.pem")
"-sha256"
"-days" "1" ; Only one day, because we expect certbot to run
"-nodes"
"-subj" #$subject
#$@(if alt-names
(list "-addext" alt-names)
(list))))))))
(define (certbot-activation config)
(let* ((certbot-directory "/var/lib/certbot")
(certbot-cert-directory "/etc/letsencrypt/live")
@ -198,6 +246,14 @@ not #f then it is run after the symlinks have been created."
(mkdir-p #$webroot)
(mkdir-p #$certbot-directory)
(mkdir-p #$certbot-cert-directory)
#$@(let ((rsa-key-size (and rsa-key-size
(number->string rsa-key-size))))
(map (generate-certificate-gexp certbot-cert-directory
rsa-key-size)
(filter certificate-configuration-start-self-signed?
certificates)))
(copy-file #$(certbot-command config) #$script)
(display #$message)))))))