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-- Prosody IM v0.3
-- Copyright (C) 2008-2009 Matthew Wild
-- Copyright (C) 2008-2009 Waqas Hussain
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
local st = require "util.stanza";
local sm_bind_resource = require "core.sessionmanager".bind_resource;
local base64 = require "util.encodings".base64;
local usermanager_validate_credentials = require "core.usermanager".validate_credentials;
local t_concat, t_insert = table.concat, table.insert;
local tostring = tostring;
local jid_split = require "util.jid".split
local md5 = require "util.hashes".md5;
local config = require "core.configmanager";
local log = require "util.logger".init("mod_saslauth");
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 new_sasl = require "util.sasl".new;
local function build_reply(status, ret, err_msg)
local reply = st.stanza(status, {xmlns = xmlns_sasl});
if status == "challenge" then
log("debug", ret or "");
reply:text(base64.encode(ret or ""));
elseif status == "failure" then
reply:tag(ret):up();
if err_msg then reply:tag("text"):text(err_msg); end
elseif status == "success" then
log("debug", ret or "");
reply:text(base64.encode(ret or ""));
else
error("Unknown sasl status: "..status);
end
return reply;
end
local function handle_status(session, status)
if status == "failure" then
session.sasl_handler = nil;
elseif status == "success" then
if not session.sasl_handler.username then error("SASL succeeded but we didn't get a username!"); end -- TODO move this to sessionmanager
sessionmanager.make_authenticated(session, session.sasl_handler.username);
session.sasl_handler = nil;
session:reset_stream();
end
end
local function password_callback(node, host, mechanism, decoder)
local password = (datamanager.load(node, host, "accounts") or {}).password; -- FIXME handle hashed passwords
local func = function(x) return x; end;
if password then
if mechanism == "PLAIN" then
return func, password;
elseif mechanism == "DIGEST-MD5" then
if decoder then node, host, password = decoder(node), decoder(host), decoder(password); end
return func, md5(node..":"..host..":"..password);
end
end
return func, nil;
end
local function sasl_handler(session, stanza)
if stanza.name == "auth" then
-- FIXME ignoring duplicates because ejabberd does
session.sasl_handler = new_sasl(stanza.attr.mechanism, session.host, password_callback);
elseif not session.sasl_handler then
return; -- FIXME ignoring out of order stanzas because ejabberd does
end
local text = stanza[1];
if text then
text = base64.decode(text);
log("debug", text);
if not text then
session.sasl_handler = nil;
session.send(build_reply("failure", "incorrect-encoding"));
return;
end
end
local status, ret, err_msg = session.sasl_handler:feed(text);
handle_status(session, status);
local s = build_reply(status, ret, err_msg);
log("debug", "sasl reply: "..tostring(s));
session.send(s);
end
module:add_handler("c2s_unauthed", "auth", xmlns_sasl, sasl_handler);
module:add_handler("c2s_unauthed", "abort", xmlns_sasl, sasl_handler);
module:add_handler("c2s_unauthed", "response", xmlns_sasl, sasl_handler);
local mechanisms_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-sasl' };
local bind_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-bind' };
local xmpp_session_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-session' };
module:add_event_hook("stream-features",
function (session, features)
if not session.username then
features:tag("mechanisms", mechanisms_attr);
-- TODO: Provide PLAIN only if TLS is active, this is a SHOULD from the introduction of RFC 4616. This behavior could be overridden via configuration but will issuing a warning or so.
features:tag("mechanism"):text("PLAIN"):up();
features:tag("mechanism"):text("DIGEST-MD5"):up();
if config.get(session.host or "*", "core", "sasl_anonymous") then
features:tag("mechanism"):text("ANONYMOUS"):up();
end
features:up();
else
features:tag("bind", bind_attr):tag("required"):up():up();
features:tag("session", xmpp_session_attr):up();
end
end);
module:add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-bind",
function (session, stanza)
log("debug", "Client tried to bind to a resource");
local resource;
if stanza.attr.type == "set" then
local bind = stanza.tags[1];
if bind and bind.attr.xmlns == xmlns_bind then
resource = bind:child_with_name("resource");
if resource then
resource = resource[1];
end
end
end
local success, err_type, err, err_msg = sm_bind_resource(session, resource);
if not success then
session.send(st.error_reply(stanza, err_type, err, err_msg));
else
session.send(st.reply(stanza)
:tag("bind", { xmlns = xmlns_bind})
:tag("jid"):text(session.full_jid));
end
end);
module:add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-session",
function (session, stanza)
log("debug", "Client tried to bind to a resource");
session.send(st.reply(stanza));
end);
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