-module:hook_stanza(xmlns_sasl, "success", function (session, stanza)
- if session.type ~= "s2sout_unauthed" or session.external_auth ~= "attempting" then return; end
- module:log("debug", "SASL EXTERNAL with %s succeeded", session.to_host);
- session.external_auth = "succeeded"
- session:reset_stream();
-
- local default_stream_attr = {xmlns = "jabber:server", ["xmlns:stream"] = "http://etherx.jabber.org/streams",
- ["xmlns:db"] = 'jabber:server:dialback', version = "1.0", to = session.to_host, from = session.from_host};
- session.sends2s("<?xml version='1.0'?>");
- session.sends2s(st.stanza("stream:stream", default_stream_attr):top_tag());
-
- s2s_make_authenticated(session, session.to_host);
- return true;
-end)
-
-module:hook_stanza(xmlns_sasl, "failure", function (session, stanza)
- if session.type ~= "s2sout_unauthed" or session.external_auth ~= "attempting" then return; end
-
- module:log("info", "SASL EXTERNAL with %s failed", session.to_host)
- -- TODO: Log the failure reason
- session.external_auth = "failed"
-end, 500)
-
-module:hook_stanza(xmlns_sasl, "failure", function (session, stanza)
- -- TODO: Dialback wasn't loaded. Do something useful.
-end, 90)
-
-module:hook_stanza("http://etherx.jabber.org/streams", "features", function (session, stanza)
- if session.type ~= "s2sout_unauthed" or not session.secure then return; end
-
- local mechanisms = stanza:get_child("mechanisms", xmlns_sasl)
- if mechanisms then
- for mech in mechanisms:childtags() do
- if mech[1] == "EXTERNAL" then
- module:log("debug", "Initiating SASL EXTERNAL with %s", session.to_host);
- local reply = st.stanza("auth", {xmlns = xmlns_sasl, mechanism = "EXTERNAL"});
- reply:text(base64.encode(session.from_host))
- session.sends2s(reply)
- session.external_auth = "attempting"
- return true
- end
- end
- end
-end, 150);
-
-local function s2s_external_auth(session, stanza)
- local mechanism = stanza.attr.mechanism;
-
- if not session.secure then
- if mechanism == "EXTERNAL" then
- session.sends2s(build_reply("failure", "encryption-required"))
- else
- session.sends2s(build_reply("failure", "invalid-mechanism"))
- end
- return true;
- end
-
- if mechanism ~= "EXTERNAL" or session.cert_chain_status ~= "valid" then
- session.sends2s(build_reply("failure", "invalid-mechanism"))
- return true;
- end
-
- local text = stanza[1]
- if not text then
- session.sends2s(build_reply("failure", "malformed-request"))
- return true
- end
-
- -- Either the value is "=" and we've already verified the external
- -- cert identity, or the value is a string and either matches the
- -- from_host (
-
- text = base64.decode(text)
- if not text then
- session.sends2s(build_reply("failure", "incorrect-encoding"))
- return true;
- end
-
- if session.cert_identity_status == "valid" then
- if text ~= "" and text ~= session.from_host then
- session.sends2s(build_reply("failure", "invalid-authzid"))
- return true
- end
- else
- if text == "" then
- session.sends2s(build_reply("failure", "invalid-authzid"))
- return true
- end
-
- local cert = session.conn:socket():getpeercertificate()
- if (cert_verify_identity(text, "xmpp-server", cert)) then
- session.cert_identity_status = "valid"
- else
- session.cert_identity_status = "invalid"
- session.sends2s(build_reply("failure", "invalid-authzid"))
- return true
- end
- end
-
- session.external_auth = "succeeded"
-
- if not session.from_host then
- session.from_host = text;
- end
- session.sends2s(build_reply("success"))
- module:log("info", "Accepting SASL EXTERNAL identity from %s", text or session.from_host);
- s2s_make_authenticated(session, text or session.from_host)
- session:reset_stream();
- return true
-end
-