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-- Prosody IM v0.2
-- Copyright (C) 2008 Matthew Wild
-- Copyright (C) 2008 Waqas Hussain
--
-- This program is free software; you can redistribute it and/or
-- modify it under the terms of the GNU General Public License
-- as published by the Free Software Foundation; either version 2
-- of the License, or (at your option) any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with this program; if not, write to the Free Software
-- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
--
local send_s2s = require "core.s2smanager".send_to_host;
local s2s_make_authenticated = require "core.s2smanager".make_authenticated;
local s2s_verify_dialback = require "core.s2smanager".verify_dialback;
local s2s_destroy_session = require "core.s2smanager".destroy_session;
local st = require "util.stanza";
local log = require "util.logger".init("mod_dialback");
local xmlns_dialback = "jabber:server:dialback";
local dialback_requests = setmetatable({}, { __mode = 'v' });
module:add_handler({"s2sin_unauthed", "s2sin"}, "verify", xmlns_dialback,
function (origin, stanza)
-- We are being asked to verify the key, to ensure it was generated by us
log("debug", "verifying dialback key...");
local attr = stanza.attr;
-- FIXME: Grr, ejabberd breaks this one too?? it is black and white in XEP-220 example 34
--if attr.from ~= origin.to_host then error("invalid-from"); end
local type;
if s2s_verify_dialback(attr.id, attr.from, attr.to, stanza[1]) then
type = "valid"
else
type = "invalid"
log("warn", "Asked to verify a dialback key that was incorrect. An imposter is claiming to be %s?", attr.to);
end
log("debug", "verified dialback key... it is %s", type);
origin.sends2s(st.stanza("db:verify", { from = attr.to, to = attr.from, id = attr.id, type = type }):text(stanza[1]));
end);
module:add_handler({ "s2sin_unauthed", "s2sin" }, "result", xmlns_dialback,
function (origin, stanza)
-- he wants to be identified through dialback
-- We need to check the key with the Authoritative server
local attr = stanza.attr;
origin.hosts[attr.from] = { dialback_key = stanza[1] };
if not hosts[attr.to] then
-- Not a host that we serve
log("info", "%s tried to connect to %s, which we don't serve", attr.from, attr.to);
origin:close("host-unknown");
return;
end
dialback_requests[attr.from] = origin;
if not origin.from_host then
-- Just used for friendlier logging
origin.from_host = attr.from;
end
if not origin.to_host then
-- Just used for friendlier logging
origin.to_host = attr.to;
end
log("debug", "asking %s if key %s belongs to them", attr.from, stanza[1]);
send_s2s(attr.to, attr.from,
st.stanza("db:verify", { from = attr.to, to = attr.from, id = origin.streamid }):text(stanza[1]));
end);
module:add_handler({ "s2sout_unauthed", "s2sout" }, "verify", xmlns_dialback,
function (origin, stanza)
local attr = stanza.attr;
local dialback_verifying = dialback_requests[attr.from];
if dialback_verifying then
local valid;
if attr.type == "valid" then
s2s_make_authenticated(dialback_verifying, attr.from);
valid = "valid";
else
-- Warn the original connection that is was not verified successfully
log("warn", "authoritative server for "..(attr.from or "(unknown)").." denied the key");
valid = "invalid";
end
if not dialback_verifying.sends2s then
log("warn", "Incoming s2s session %s was closed in the meantime, so we can't notify it of the db result", tostring(dialback_verifying):match("%w+$"));
else
dialback_verifying.sends2s(
st.stanza("db:result", { from = attr.to, to = attr.from, id = attr.id, type = valid })
:text(dialback_verifying.hosts[attr.from].dialback_key));
end
dialback_requests[attr.from] = nil;
end
end);
module:add_handler({ "s2sout_unauthed", "s2sout" }, "result", xmlns_dialback,
function (origin, stanza)
-- Remote server is telling us whether we passed dialback
local attr = stanza.attr;
if not hosts[attr.to] then
origin:close("host-unknown");
return;
elseif hosts[attr.to].s2sout[attr.from] ~= origin then
-- This isn't right
origin:close("invalid-id");
return;
end
if stanza.attr.type == "valid" then
s2s_make_authenticated(origin, attr.from);
else
s2s_destroy_session(origin)
end
end);
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