Let's Encrypt

Let's Encrypt est un projet soutenu par Internet Security Research Group (ISRG). L'objectif est de permettre à tous et gratuitement de pouvoir mettre en place des certificats SSL pour sécuriser les connexions.

Configuration des certificats Let's Encrypt

J'ai configuré les certificats pour plusieurs noms de domaines et voici la procédure suivie, pour le domaine fictif “plouf.com”.

On commence par activer les backports (sous Stretch) afin de bénéficier de la version de certbot la plus récente.

# vim /etc/apt/sources.list
  #(...ajouter à la fin du fichier :)
  # Backports repository
  deb http://ftp.debian.org/debian stretch-backports main

Dans mon cas, après installation sans les backports, certbot était en version 0.10 alors qu'avec les backports, on a la version 0.19.0.

# apt-get -t stretch-backports install python-certbot-apache

# certbot --version
certbot 0.19.0

# certbot --apache
Saving debug log to /var/log/letsencrypt/letsencrypt.log
 
Which names would you like to activate HTTPS for?
-------------------------------------------------------------------------------
1: plouf.com
2: sous.plouf.com
3: piscine.plouf.com
-------------------------------------------------------------------------------
Select the appropriate numbers separated by commas and/or spaces, or leave input
blank to select all options shown (Enter 'c' to cancel):1,2,3
Enter email address (used for urgent renewal and security notices) (Enter 'c' to
cancel):mon@mail.com
 
-------------------------------------------------------------------------------
Please read the Terms of Service at
https://letsencrypt.org/documents/LE-SA-v1.2-November-15-2017.pdf. You must
agree in order to register with the ACME server at
https://acme-v01.api.letsencrypt.org/directory
-------------------------------------------------------------------------------
(A)gree/(C)ancel: A
Obtaining a new certificate
Performing the following challenges:
tls-sni-01 challenge for plouf.com
tls-sni-01 challenge for sous.plouf.com
tls-sni-01 challenge for piscine.plouf.com
Enabled Apache socache_shmcb module
Enabled Apache ssl module
Waiting for verification...
Cleaning up challenges
Generating key (2048 bits): /etc/letsencrypt/keys/0000_key-certbot.pem
Creating CSR: /etc/letsencrypt/csr/0000_csr-certbot.pem
Created an SSL vhost at /etc/apache2/sites-available/vps89550.ovh.net-le-ssl.conf
Enabled Apache socache_shmcb module
Enabled Apache ssl module
Deploying Certificate to VirtualHost /etc/apache2/sites-available/vps89550.ovh.net-le-ssl.conf
Enabling available site: /etc/apache2/sites-available/vps89550.ovh.net-le-ssl.conf
An unexpected error occurred:
StopIteration
Please see the logfiles in /var/log/letsencrypt for more details.
 
IMPORTANT NOTES:
 - Unable to install the certificate
 - Congratulations! Your certificate and chain have been saved at
   /etc/letsencrypt/live/caliban.be/fullchain.pem. Your cert will
   expire on 2018-04-10. To obtain a new or tweaked version of this
   certificate in the future, simply run certbot again with the
   "certonly" option. To non-interactively renew *all* of your
   certificates, run "certbot renew"
 - If you lose your account credentials, you can recover through
   e-mails sent to moi@simonlefort.be.
 - Your account credentials have been saved in your Certbot
   configuration directory at /etc/letsencrypt. You should make a
   secure backup of this folder now. This configuration directory will
   also contain certificates and private keys obtained by Certbot so
   making regular backups of this folder is ideal.

Sources

Sysnove.fr