SSL Certs

Upcoming fun stuff

SSL certs via ClouDNS' "Free SSL Certificates"

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Installing Certbot on your machine

Certbot now requires that you install it from SNAP.

sudo apt update
sudo apt upgrade

Install SNAP

sudo apt install snapd
sudo snap install core; sudo snap refresh core

Install Certbot

sudo snap install --classic certbot
sudo ln -s /snap/bin/certbot /usr/bin/certbot

Certs for Devices not Actually Accessible on the Internet

Using HTTP challenge

(Do this on your primary web/proxy server)

• sudo certbot certonly -d MACHINE.DOMAIN.TLD
  • when it asks... choose option 1: Apache Web Server plugin
  • Copy your shiny new cert into place
    

Using DNS challenge

• For each machine
• sudo certbot -d MACHINE.DOMAIN.TLD --manual --preferred-challenges dns certonly
  • Follow the directions about setting up the DNS record & then hit enter
  • Copy your shiny new cert into place

Stuff still being worked out...

• Problem:  Renewal is potentially problematic
  • Tho... Apparently, renewal of a manual cert involves just running the original command again.
    • (every time you run certbot as above, the TXT Record value changes...)
    • one solution might be to use your DNS providers API calls...
    • ooohhh --reuse-key
• cron job to manage it all

If getting certs for a proxied site...

You will need to copy the cert files that you acquired over to the proxied site. You do not need Certbot installed on the proxy VM as it isn't required but you will need to create the appropriate folders to copy the certs into. SSH into the proxy machine -

cd /etc
sudo mkdir letsencrypt
cd /letsencrypt
sudo mkdir live
cd /etc<br>

Now exit back out to your web server and SCP your cert files from /etc/letsencrypt/live to the folder you created on the proxy machine.

Certs on an Apache based server

From /usr/share/doc/apache2/README.Debian.gz

Enabling SSL

To enable SSL, type:

• sudo a2ensite default-ssl
• sudo a2enmod ssl

If you want to use self-signed certificates, you should install the ssl-cert
package (see below). Otherwise, just adjust the SSLCertificateKeyFile and SSLCertificateFile directives in '/etc/apache2/sites-available/default-ssl.conf' to point to your SSL certificate. Then restart apache:

• sudo systemctl restart apache2

The SSL key file should only be readable by root; the certificate file may be globally readable. These files are read by the Apache parent process which runs as root, and it is therefore not necessary to make the files readable by the www-data user.

Getting proper certificates onto the machine

Using the instructions at the top of the page, Install SNAP, Install Certbot and grab the certs for your machines that need them.
The old way to do this is still on the TinkerNet Wiki.

Now Do A Backup!