Operations grimoire/TLS certificates

SSL certificates should be used for every service we provide.

Let's encrypt commands

2016-07-31: client upgraded on Ysul. New client name is certbot, not anymore letsencrypt.

Generate a certificate

Ysul (/var/letsencrypt-auto folder) :

certbot certonly --server https://acme-v02.api.letsencrypt.org/directory -a webroot --webroot-path=/var/letsencrypt-auto -d foo.nasqueron.org

Dwellers (container will use /www):

certbot certonly --server https://acme-v02.api.letsencrypt.org/directory -a webroot --webroot-path=/www -d bar.nasqueron.org

Generate a certificate for several sites

-d foo.nasqueron.org -d bar.nasqueron.org

If a certificate for foo already existed, it will offer to extend it to a new alternative name, which is probably a good idea.

Renew all certificates

Ysul: certbot renew

Dwellers: letsencrypt renew

Special considerations

New server

Let's encrypt client is available on Ysul (natively) and Dwellers (as a wrapper script for a Docker container).

Fill a task in Servers component, subscribe Sandlayth and Dereckson to deploy it on a new server.

A salt state would be nice for such purpose.

Internationalized domain names

Punycode conversion

Both for web server configuration and certificate authority, name must be converted to Punycode (RFC 3492): https://www.punycoder.com/

No let's encrypt support

Let's encrypt doesn't support IDN. The main reason is they're afraid of malicious uses: attackers could register a domain with a Cyrillic character matching a real domains. As some people consider it's the responsibility of the CA to mitigate such risks, the feature has been several times postponed.

You can check the Let's encrypt roadmap here.

StartSSL

StartSSL supports IDN. We so use this CA.

StartSSL nasqueron.org domain is validated on Dereckson account. Assign them to a task for a certificate.

Ysul has a `csr` script.

Note this script isn't the best adapted to the new StartSSL workflow, as it wants as final input the unbundled certificate content to create the bundle. At writing time, StartSSL outputs directly in a textarea the certificate, now they offer archives with already bundled file.

We need to fix the script with the new actual URL of the intermediate cert, take the "others" version, so you'll get unbundled certificate.