Prosody XMPP Server

Initial Installation

Install the following packages:

apt-get install prosody lua-dbi-sqlite3 lua-zlib lua-cyrussasl libsasl2-modules-gssapi-mit

Grant the host permission to the service/xmpp directory:

fs sa /afs/acm.jhu.edu/service/xmpp rcmd.crimea rl
fs sa /afs/acm.jhu.edu/service/xmpp/snapshot rcmd.crimea rlidwk

SSL Setup

Follow the instructions in SSL to get an SSL certificate. Land the key in /etc/prosody/certs/xmpp.acm.jhu.edu.key and the cert, followed by intermediate certs, in /etc/prosody/certs/xmpp.acm.jhu.edu.crt. Check your work with (yes, the file needs to be given twice)

openssl verify -CAfile /etc/prosody/certs/xmpp.acm.jhu.edu.crt /etc/prosody/certs/xmpp.acm.jhu.edu.crt

Note

Prosody is particular about the order of the certificates in its key file. Make sure that its comes first by running openssl x509 -noout -text -in /etc/prosody/certs/xmpp.acm.jhu.edu.crt and making sure that the Subject is as expected. If it doesn’t, you will get mysterious “no shared cipers” failures!

Build dhparams:

openssl dhparam -out /etc/prosody/certs/dh-2048.pem 2048

Set up SASL

In /etc/prosody/prosody.cfg.lua, set the following options globally:

authentication = "cyrus"
cyrus_service_name = "prosody"
cyrus_service_realm = ""

c2s_require_encryption = true
s2s_secure_auth = true

Create /etc/sasl/prosody.conf with the following contents:

pwcheck_method: saslauthd
mech_list: PLAIN GSSAPI

Adjust /etc/default/saslauthd

START=yes
MECHANISMS=kerberos5

And run

addgroup prosody sasl

Set up virtual host

In /etc/prosody/prosody.cfg.lua, add the following stanza:

VirtualHost "xmpp.acm.jhu.edu"
  enabled = true

  -- Assign this host a certificate for TLS, otherwise it would use the one
  -- set in the global section (if any).
  -- Note that old-style SSL on port 5223 only supports one certificate, and will always
  -- use the global one.

  ssl = {
          key = "/etc/prosody/certs/xmpp.acm.jhu.edu.key";
          certificate = "/etc/prosody/certs/xmpp.acm.jhu.edu.crt";
          options = { "no_sslv2", "no_ticket", "no_compression", "no_sslv3" };
          dhparam = "/etc/prosody/certs/dh-2048.pem";
          protocl = "tlsv1_2+";
  }

Add to XMPP glue in DNS

Add a SRV record or two for XMPP clients and servers in DNS:

_xmpp-client._tcp IN SRV 5 0 5222 crimea.acm.jhu.edu.

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