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Found at: raymii.org:70/Ejabberd_SSL_Certificate.txt

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Title       : 	Ejabberd SSL Certificate
Author      : 	Remy van Elst
Date        : 	13-06-2013
URL         : 	https://raymii.org/s/tutorials/Ejabberd_SSL_Certificate.html
Format      : 	Markdown/HTML
This tutorial shows you how to set up an SSL Certificate for use with Ejabberd.
It covers both the creation of the Certificate Signing Request, the preparing of
the certificate for use with Ejabberd and the installation of the certificate.

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[If you need to set up an ejabberd server then you can read my tutorial here how
to do that][2].
This tutorial assumes a working ejabberd installation. It is tested on Debian
and Ubuntu, but should work on any ejabberd installation.
### Steps and Explanation
To get an SSL certificate working on ejabberd we need to do a few things:
  * Create an Certificate Signing Request (CSR) and a Private Key
  * Submit the CSR to a Certificate Authority, let them sign it and give you a Certificate
  * Combine the certificate, private key (and chain) into a ejabberd compatible PEM file
  * Install the certificate in ejabberd
With a certificate we can secure our XMPP connection and conversations. This way
it is much harder for others to spy on your conversations. Combined with OTR
this enabled a super secure channel for conversation.
### Creating the Certificate Signing Request
Create a folder to store all the files and cd to that:
mkdir -p ~/Certificates/xmpp cd ~/Certificates/xmpp
Now use OpenSSL to create both a Private Key and a CSR. The first command will
do it interactively, the second command will do it non-interactive. Make sure to
set the correct values, your Common Name (CN) should be your XMPP server URL:
openssl req -nodes -newkey rsa:2048 -keyout private.key -out CSR.csr
openssl req -nodes -newkey rsa:2048 -keyout private.key -out CSR.csr -subj
"/C=NL/ST=State/L=City/O=Company Name/OU=Department/CN=chat.example.org"
This will result in two files, `CSR.csr` and `private.key`. You now have to
submit the CSR to a Certificate Authority. This can be any CA, I myself have
good experiences with [Xolphin][3], but there are others like Digicert and
Once you have submitted your CSR and have gotten a Certificate you can continue.
### Creating the ejabberd certificate
Once you have all the files (private key, certificate and certificate chain),
put them all in a folder and continue. We are going to `cat` all the required
files into a `ejabberd.pem` file.
This needs to happen in a specific order:
  * private key
  * certificate
  * chains
So adapt the following commands to your filenames and create the pem file:
cat private.key >> ejabberd.pem cat certificate.pem >> ejabberd.pem cat
chain-1.pem >> ejabberd.pem cat chain-2.pem >> ejabberd.pem
If that all works out continue.
### Installing the certificate in ejabberd
Copy the certificate to all your ejabberd servers:
scp ejabberd.pem user@srv1.example.org:
The place the certificate in the `/etc/ejabberd` folder:
cp ejabberd.pem /etc/ejabberd/ejabberd.pem
Now change the ejabberd config to point to the new certificate:
vim /etc/ejabberd/ejabberd.cfg
Check/change the following to point to the new certificate:
[...] {listen, [ {5222, ejabberd _c2s, [ {access, c2s}, {shaper, c2s_ shaper},
{max _stanza_ size, 65536}, starttls, {certfile, "/etc/ejabberd/ejabberd.pem"}
]}, [...] {s2s _use_ starttls, true}. {s2s_certfile,
"/etc/ejabberd/ejabberd.pem"}. [...]
Afterwards restart ejabberd:
/etc/init.d/ejabberd restart
You can now use any XMPP client to connect with SSL/TLS to see if it works.
   [1]: https://www.digitalocean.com/?refcode=7435ae6b8212
   [2]: https://raymii.org/s/tutorials/Set_up_a_federated_XMPP_Chat_Network_with_ejabberd.html
   [3]: https://sslcertificaten.nl
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