-- Prosody IM
-- Copyright (C) 2008-2010 Matthew Wild
-- Copyright (C) 2008-2010 Waqas Hussain
---
+--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
local sm_make_authenticated = require "core.sessionmanager".make_authenticated;
local base64 = require "util.encodings".base64;
-local nodeprep = require "util.encodings".stringprep.nodeprep;
+local cert_verify_identity = require "util.x509".verify_identity;
+
local usermanager_get_sasl_handler = require "core.usermanager".get_sasl_handler;
local tostring = tostring;
local xmlns_sasl ='urn:ietf:params:xml:ns:xmpp-sasl';
local xmlns_bind ='urn:ietf:params:xml:ns:xmpp-bind';
-local xmlns_stanzas ='urn:ietf:params:xml:ns:xmpp-stanzas';
local function build_reply(status, ret, err_msg)
local reply = st.stanza(status, {xmlns = xmlns_sasl});
local function handle_status(session, status, ret, err_msg)
if status == "failure" then
+ module:fire_event("authentication-failure", { session = session, condition = ret, text = err_msg });
session.sasl_handler = session.sasl_handler:clean_clone();
elseif status == "success" then
- local username = nodeprep(session.sasl_handler.username);
-
local ok, err = sm_make_authenticated(session, session.sasl_handler.username);
if ok then
+ module:fire_event("authentication-success", { session = session });
session.sasl_handler = nil;
session:reset_stream();
else
module:log("warn", "SASL succeeded but username was invalid");
+ module:fire_event("authentication-failure", { session = session, condition = "not-authorized", text = err });
session.sasl_handler = session.sasl_handler:clean_clone();
return "failure", "not-authorized", "User authenticated successfully, but username was invalid";
end
return true;
end
+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();
+ session:open_stream(session.from_host, session.to_host);
+
+ module:fire_event("s2s-authenticated", { session = session, host = 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"
+ session:close();
+ return true;
+end, 500)
+
+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"))
+
+ local domain = text ~= "" and text or session.from_host;
+ module:log("info", "Accepting SASL EXTERNAL identity from %s", domain);
+ module:fire_event("s2s-authenticated", { session = session, host = domain });
+ session:reset_stream();
+ return true
+end
+
module:hook("stanza/urn:ietf:params:xml:ns:xmpp-sasl:auth", function(event)
local session, stanza = event.origin, event.stanza;
- if session.type ~= "c2s_unauthed" then return; end
+ if session.type == "s2sin_unauthed" then
+ return s2s_external_auth(session, stanza)
+ end
+
+ if session.type ~= "c2s_unauthed" or module:get_host_type() ~= "local" then return; end
if session.sasl_handler and session.sasl_handler.selected then
session.sasl_handler = nil; -- allow starting a new SASL negotiation before completing an old one
end
if not session.sasl_handler then
- session.sasl_handler = usermanager_get_sasl_handler(module.host);
+ session.sasl_handler = usermanager_get_sasl_handler(module.host, session);
end
local mechanism = stanza.attr.mechanism;
if not session.secure and (secure_auth_only or (mechanism == "PLAIN" and not allow_unencrypted_plain_auth)) then
if secure_auth_only and not origin.secure then
return;
end
- origin.sasl_handler = usermanager_get_sasl_handler(module.host);
- features:tag("mechanisms", mechanisms_attr);
+ origin.sasl_handler = usermanager_get_sasl_handler(module.host, origin);
+ if origin.encrypted then
+ -- check wether LuaSec has the nifty binding to the function needed for tls-unique
+ -- FIXME: would be nice to have this check only once and not for every socket
+ if origin.conn:socket().getpeerfinished and origin.sasl_handler.add_cb_handler then
+ origin.sasl_handler:add_cb_handler("tls-unique", function(self)
+ return self.userdata:getpeerfinished();
+ end);
+ origin.sasl_handler["userdata"] = origin.conn:socket();
+ end
+ end
+ local mechanisms = st.stanza("mechanisms", mechanisms_attr);
for mechanism in pairs(origin.sasl_handler:mechanisms()) do
if mechanism ~= "PLAIN" or origin.secure or allow_unencrypted_plain_auth then
- features:tag("mechanism"):text(mechanism):up();
+ mechanisms:tag("mechanism"):text(mechanism):up();
end
end
- features:up();
+ if mechanisms[1] then features:add_child(mechanisms); end
else
features:tag("bind", bind_attr):tag("required"):up():up();
features:tag("session", xmpp_session_attr):tag("optional"):up():up();
end
end);
+module:hook("s2s-stream-features", function(event)
+ local origin, features = event.origin, event.features;
+ if origin.secure and origin.type == "s2sin_unauthed" then
+ -- Offer EXTERNAL if chain is valid and either we didn't validate
+ -- the identity or it passed.
+ if origin.cert_chain_status == "valid" and origin.cert_identity_status ~= "invalid" then --TODO: Configurable
+ module:log("debug", "Offering SASL EXTERNAL")
+ features:tag("mechanisms", { xmlns = xmlns_sasl })
+ :tag("mechanism"):text("EXTERNAL")
+ :up():up();
+ end
+ end
+end);
+
module:hook("iq/self/urn:ietf:params:xml:ns:xmpp-bind:bind", function(event)
local origin, stanza = event.origin, event.stanza;
local resource;
if stanza.attr.type == "set" then
local bind = stanza.tags[1];
- resource = bind:child_with_name("resource");
+ resource = bind:get_child("resource");
resource = resource and #resource.tags == 0 and resource[1] or nil;
end
local success, err_type, err, err_msg = sm_bind_resource(origin, resource);
projects / prosody.git / blobdiff