SSL certificate installation with DigiCert®

Here is my story about SSL certificates. I got this ongoing project at my workplace and the site is already secured with SSL. And at the end of its expiration the site went down. (You know how it feels as the developer). I write this article to acknowledge my procedures.

Let’s have some basic knowledge first:

HTTPS — Hypertext Transfer Protocol Secure

SSL — Secure Sockets Layer

TLS — Transport Layer Security

To make the site secure

W3Techs survey from May 2018

My story amends with the CA — DigiCert ®

SSL Certificate

  1. Public Key
  2. Private Key

Above keys are used to establish a encrypted connection. Also SSL Certificate will contain your

  1. Domain name
  2. Company name
  3. Address
  4. City
  5. State
  6. Country
  7. Expiration date of the Certificate and details of the CA

Here are the steps to generate and install the SSL certificate.

My project is with Ruby on Rails + Nginx, And my server runs Ubuntu.

Step 01 — Create a CSR

We must create a CSR before ordering a SSL certificate.

CSR in an encoded file with the public key and some information that requires to identify the company.

To generate the CSR, following would help. (change the test to your domain name)

openssl req -new -newkey rsa:2048 -nodes -keyout test-domain.key -out test-domain.csr

Once this runs, it asked many question about the organization.

Once completed you list the CSR and the KEY

This is how it looks like inside the CSR

So, in my server, I created a folder named as “ssl”. I did this process inside that folder. So now I have both CSR and the server private key.

Step 02 — Create the SSL certificate

The certificate will be sent through an email and it will look

-----BEGIN CERTIFICATE-----

[encoded data]

------END CERTIFICATE-----

According to the certificate chain we also need the Intermediate CA certificate. This certificate will also look like above. We can fin the intermediate CA certificates from this link.

Finally, we have to concatenate both Intermediate CA certificate and the SSL certificate. We can simple do that process and see the certificate from a single command.

cat ssl_certificate.crt IntermeidateCA.crt >> domain_name.crt

That’s all. Now you have the full certificate with you. Let’s move to the next step.

Step 03 —Install the certificate into the Nginx

upstream puma {
server unix:///shared/tmp/sockets/pml_prod-puma.sock;
}
# Force https for http requests
server {
listen 80;
listen [::]:80;
server_name hello.picturemylife.se;
return 301 https://$host$request_uri;
}
server {
charset utf-8;
listen 443;ssl on;
ssl_certificate /home/deploy/ssl/test-cert.crt;
ssl_certificate_key /home/deploy/ssl/private-key.key;
# side note: only use TLS since SSLv2 and SSLv3 have had recent vulnerabilities
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
#listen 80 default_server deferred;
server_name hello.example.com;
root /home/deploy/pml_prod/current/public;
access_log /log/nginx.access.log;
error_log /log/nginx.error.log info;
location ^~ /assets/ {
gzip_static on;
expires max;
add_header Cache-Control public;
# Allow CORS
add_header 'Access-Control-Allow-Origin' '*';
add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
add_header 'Access-Control-Allow-Headers' 'Accept,Authorization,Cache-Control,Content-Type,DNT,If-Modified-Since,Keep-Alive,Origin,User-Agent,X-Mx-ReqToken,X-Requested-With';
}
try_files $uri/index.html $uri @puma;
location @puma {
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_redirect off;
proxy_pass http://puma;
}
error_page 500 502 503 504 /500.html;
client_max_body_size 10M;
keepalive_timeout 10;
}

Only part necessary for the SSL is

listen 443;ssl on;ssl_certificate /home/deploy/ssl/test-cert.crt;
ssl_certificate_key /home/deploy/ssl/private-key.key;

Step 04 — Restart the Server Nginx

sudo /etc/init.d/nginx restart

Step 05 — Verify the Security

or else open the following site with the domain-name as a host in params.

https://www.digicert.com/help/?host=domain-name

Here is the result of our server domain.

The End…

References:

https://knowledge.digicert.com/solution/SO26631.html#links

https://www.ssl.com/faqs/faq-what-is-ssl/