PositiveSSL Certificate - ssl

Question

My client bought a PositiveSSL Certificate, and he gave me 2 files, crt and ca-bundle.
How can I install these files to the ubuntu server and make the https protocol work?
FYI, I'm using nginx.
Any clue?

Answer 1

key file
First off: you need the secret key as well, from the extensions on the filenames you are missing that file.
ngnix
nginx expects a chained certificate, but that's easy enough to create:
$ cd /path/to
$ cat www.example.com.crt ca-bundle.crt > example.bundle.crt
While at it create the Diffie–Hellman parameters:
$ openssl dhparam -out dh4096.pem 4096
You need to add a few statements to the appropriate place in your configuration file(s).
It's the server block that needs something like this:
server {
listen 443 ssl http2;
server_name www.example.com ;
ssl on;
ssl_certificate /path/to/example.bundle.crt;
ssl_certificate_key /path/to/example.key;
# take care: a single add_header *will* wipe all the inherited ones!
# HSTS (be careful, this is irreversible!)
# add_header Strict-Transport-Security "max-age=31536000; includeSubdomains;";
}
Something like this can be added to the http block:
http {
#ssl parameters (certificates in the virtual servers)
ssl_dhparam /path/to/dh4096.pem;
ssl_ciphers "ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:!DSS:!DES";
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_session_cache shared:SSL:10m;
ssl_session_timeout 5m;
ssl_prefer_server_ciphers on;
}
[that way you only need to maintain that stuff once for all virtual servers, is also ok to add it in the server blocks that use ssl]
More info:
http://nginx.org/en/docs/http/configuring_https_servers.html
Test it
Free tests are available, e.g. this one: https://www.ssllabs.com/ssltest/
Fix it to make sure you're set at a high enough rating.