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--- tips:ssl [2017/04/03 11:55] – [certificate integration for apache] scipio
+++ tips:ssl [2022/06/22 07:15] (current) – [letsencrypt staging] sscipioni
@@ Line 5: / Line 5: @@
 [[https://letsencrypt.org/|letsencrypt certification authority]] is free, automated and open.
+===== letsencrypt staging =====
+get ca certificate and use with curl
+<code | download>
+API_HOST=sso.csgalileo.org
+echo quit | openssl s_client -showcerts -servername "$API_HOST" -connect "$API_HOST":443 > cacert.pem
+curl --cacert cacert.pem https://sso.csgalileo.org/
+</code>
+in browser import this [[https://letsencrypt.org/certs/staging/letsencrypt-stg-int-r3.pem|CA]]
+===== certbot ======
+<code>
+snap install --classic certbot
+# or for focal pre
+add-apt-repository ppa:certbot/certbot
+apt-get update
+apt-get install -y certbot python-certbot-nginx
+</code>
+<code>
+certbot certonly --webroot -w /var/www/html -d mail.veronamobile.it
+</code>
+wildcard
+<code>
+certbot certonly \
+ --manual \
+ --preferred-challenges=dns \
+ --email stefano.scipioni@csgalileo.org \
+ --server https://acme-v02.api.letsencrypt.org/directory \
+ --agree-tos -d *.iotaiuto.it
+</code>
+==== nginx ====
+<file>
+server {
+  listen 80;
+  server_name nextcloud.csgalileo.org;
+  server_tokens off;
+  location /.well-known/acme-challenge {
+    root /var/www;
+    allow all;
+  }
+  location / {
+    return 301 https://$server_name$request_uri;
+  }
+}
+server {
+    listen 443;
+    server_name nnextcloud.csgalileo.org;
+    ssl_certificate /etc/letsencrypt/live/nextcloud.csgalileo.org/fullchain.pem;
+    ssl_certificate_key /etc/letsencrypt/live/nextcloud.csgalileo.org/privkey.pem;
+}
+</file>
+renew
+<code>
+certbot renew [--dry-run]
+</code>
+automatic renew
+<code>
+systemctl status certbot.service
+</code>
+/etc/letsencrypt/cli.ini
+<code>
+max-log-backups = 0
+deploy-hook = systemctl reload nginx
+</code>
 ===== acme.sh integration for letsencrypt =====
@@ Line 94: / Line 173: @@
     RewriteCond %{REQUEST_URI} !^/.well-known.*
     RewriteRule ^/?(.*) https://%{SERVER_NAME}:443/$1 [R,L]
-    Redirect permanent / https://projects.csgalileo.org/
+    # Redirect permanent / https://projects.csgalileo.org/
 </VirtualHost>
@@ Line 147: / Line 226: @@
 acme.sh --renew  -d  mail.csgalileo.org  --force --ecc
 </code>
+==== multi server ====
+i can confirm this works.
+<code>
+location ~ /.well-known/acme-challenge/ {
+proxy_pass http://ctrl.mydomain.com:80;
+}
+</code>
+using nginx i added this location to ALL server blocks.
+You then run lets encrypt on the machine ctrl.mydomain.com (this machine typically is the controller machine, and is not serving web stuff - its pure purpose from a web POV is to handle incoming cert requests - if you don't know what a controller machine is then read up on ansible)
+To make it work I had to use the webroot plugin for Let's Encrypt. I could not get standalone mode to work.
+my A records look like ..
+<code>
+www01.mydomain.com1 points to 1.2.3.4
+www02.mydomain.com points to 2.3.4.5
+ctrl.mydomain.com points to 3.4.5.6
+mydomain.com points to 1,2,3,4 and 2,3,4,5 (multiple A records)
+www.mydomain.com is an alias (cname) for mydomain.com
+</code>
+NGINX runs on www01 and www02 on port 80 to load balance requests (e.g. www01 load balances between www01 and www02, www02 ALSO load balances between www01 and www02)
+the above lets encrypt location block is added to NGINX running on both www01 and www02 for all NGINX server blocks
+now run lets encrypt in webroot mode (you will need to standup a web server on your controller machine) and request a single certificate for www01.mydomain.com1 www02.mydomain.com mydomain.com www.mydomain.com
+when you run this command on your controller machine (ctrl.mydomain.com) it will fireoff a request to each of the 4 domains in return. Every single request will be proxied back to ctrl.mydomain.com via NGINX
+bosh!
+tips
+- to use webroot mode you will need to have a basic web server running on ctrl.domain.com which can serve content from a specified directory
+- do not use standalone mode, i could not get it to work
+- this solution sits very nicely if you are using ansible, since the certs will live on the controller machine and can be copied across to all slave machines with a single command