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I'm using ejabberd on Ubuntu. My configuration looks like this:

  {5269, ejabberd_s2s_in, [
                       {shaper, s2s_shaper},
                       {max_stanza_size, 131072},
  {5222, ejabberd_c2s, [
                    {access, c2s},
                    {shaper, c2s_shaper},
                    {max_stanza_size, 65536},
                    starttls, {certfile, "./xmpp.pem"}
  {s2s_use_starttls, true}.
  {s2s_certfile, "./xmpp.pem"}.

Still xmpp.net is showing that s2s TLS is not "required" but only "allowed". In addition SSLv3 is enabled for c2s and s2s and some insecure ciphers like RC4.

How can I disable SSLv3 and RC4, and force starttls on all connections?


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1 Answer 1

up vote 1 down vote accepted

Requiring StartTLS:

{s2s_use_starttls, require}. instead of {s2s_use_starttls, true}. (keep in mind this will currently make you unable to connect to gmail.com and all domains they host).

Weak ciphers:

See http://www.process-one.net/docs/ejabberd/guide_en.html#sec27. I think this means doing something like adding {ciphers, "..."} to the ejabberd_c2s options. Check with openssl ciphers -V '...' to see what ciphers a cipher string will enable.

As far as I can tell, it's not possible to disable SSLv3 without recompiling ejabberd yourself. See some discussion here.

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