+-- 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 format = string.format;
-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 hosts = _G.hosts;
-local log = require "util.logger".init("mod_dialback");
+local log = module._log;
-local xmlns_dialback = "jabber:server:dialback";
+local st = require "util.stanza";
+local sha256_hash = require "util.hashes".sha256;
+local sha256_hmac = require "util.hashes".hmac_sha256;
+local nameprep = require "util.encodings".stringprep.nameprep;
+local check_cert_status = module:depends"s2s".check_cert_status;
+local uuid_gen = require"util.uuid".generate;
-add_handler({"s2sin_unauthed", "s2sin"}, "verify", xmlns_dialback,
- function (origin, stanza)
+local xmlns_stream = "http://etherx.jabber.org/streams";
+
+local dialback_requests = setmetatable({}, { __mode = 'v' });
+
+local dialback_secret = sha256_hash(module:get_option_string("dialback_secret", uuid_gen()), true);
+local dwd = module:get_option_boolean("dialback_without_dialback", false);
+
+function module.save()
+ return { dialback_secret = dialback_secret };
+end
+
+function module.restore(state)
+ dialback_secret = state.dialback_secret;
+end
+
+function generate_dialback(id, to, from)
+ return sha256_hmac(dialback_secret, to .. ' ' .. from .. ' ' .. id, true);
+end
+
+function initiate_dialback(session)
+ -- generate dialback key
+ session.dialback_key = generate_dialback(session.streamid, session.to_host, session.from_host);
+ session.sends2s(st.stanza("db:result", { from = session.from_host, to = session.to_host }):text(session.dialback_key));
+ session.log("debug", "sent dialback key on outgoing s2s stream");
+end
+
+function verify_dialback(id, to, from, key)
+ return key == generate_dialback(id, to, from);
+end
+
+module:hook("stanza/jabber:server:dialback:verify", function(event)
+ local origin, stanza = event.origin, event.stanza;
+
+ if origin.type == "s2sin_unauthed" or origin.type == "s2sin" then
-- We are being asked to verify the key, to ensure it was generated by us
- log("debug", "verifying dialback key...");
+ origin.log("debug", "verifying that dialback key is ours...");
local attr = stanza.attr;
- -- FIXME: Grr, ejabberd breaks this one too?? it is black and white in XEP-220 example 34
+ if attr.type then
+ module:log("warn", "Ignoring incoming session from %s claiming a dialback key for %s is %s",
+ origin.from_host or "(unknown)", attr.from or "(unknown)", attr.type);
+ return true;
+ end
+ -- COMPAT: 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
+ if 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);
+ origin.log("warn", "Asked to verify a dialback key that was incorrect. An imposter is claiming to be %s?", attr.to);
end
- log("debug", "verifyied dialback key... it is %s", type);
- origin.sends2s(format("<db:verify from='%s' to='%s' id='%s' type='%s'>%s</db:verify>", attr.to, attr.from, attr.id, type, stanza[1]));
- end);
+ origin.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]));
+ return true;
+ end
+end);
-add_handler("s2sin_unauthed", "result", xmlns_dialback,
- function (origin, stanza)
+module:hook("stanza/jabber:server:dialback:result", function(event)
+ local origin, stanza = event.origin, event.stanza;
+
+ if origin.type == "s2sin_unauthed" or origin.type == "s2sin" then
-- he wants to be identified through dialback
-- We need to check the key with the Authoritative server
local attr = stanza.attr;
+ local to, from = nameprep(attr.to), nameprep(attr.from);
+
+ if not hosts[to] then
+ -- Not a host that we serve
+ origin.log("warn", "%s tried to connect to %s, which we don't serve", from, to);
+ origin:close("host-unknown");
+ return true;
+ elseif not from then
+ origin:close("improper-addressing");
+ end
+
+ if dwd and origin.secure then
+ if check_cert_status(origin, from) == false then
+ return
+ elseif origin.cert_chain_status == "valid" and origin.cert_identity_status == "valid" then
+ origin.sends2s(st.stanza("db:result", { to = from, from = to, id = attr.id, type = "valid" }));
+ module:fire_event("s2s-authenticated", { session = origin, host = from });
+ return true;
+ end
+ end
+
+ origin.hosts[from] = { dialback_key = stanza[1] };
+
+ dialback_requests[from.."/"..origin.streamid] = origin;
+
+ -- COMPAT: ejabberd, gmail and perhaps others do not always set 'to' and 'from'
+ -- on streams. We fill in the session's to/from here instead.
+ if not origin.from_host then
+ origin.from_host = from;
+ end
+ if not origin.to_host then
+ origin.to_host = to;
+ end
+
+ origin.log("debug", "asking %s if key %s belongs to them", from, stanza[1]);
+ module:fire_event("route/remote", {
+ from_host = to, to_host = from;
+ stanza = st.stanza("db:verify", { from = to, to = from, id = origin.streamid }):text(stanza[1]);
+ });
+ return true;
+ end
+end);
+
+module:hook("stanza/jabber:server:dialback:verify", function(event)
+ local origin, stanza = event.origin, event.stanza;
+
+ if origin.type == "s2sout_unauthed" or origin.type == "s2sout" then
local attr = stanza.attr;
- origin.from_host = attr.from;
- origin.to_host = attr.to;
- origin.dialback_key = stanza[1];
- log("debug", "asking %s if key %s belongs to them", origin.from_host, origin.dialback_key);
- send_s2s(origin.to_host, origin.from_host,
- format("<db:verify from='%s' to='%s' id='%s'>%s</db:verify>", origin.to_host, origin.from_host,
- origin.streamid, origin.dialback_key));
- hosts[origin.to_host].s2sout[origin.from_host].dialback_verifying = origin;
- end);
-
-add_handler({ "s2sout_unauthed", "s2sout" }, "verify", xmlns_dialback,
- function (origin, stanza)
- if origin.dialback_verifying then
+ local dialback_verifying = dialback_requests[attr.from.."/"..(attr.id or "")];
+ if dialback_verifying and attr.from == origin.to_host then
local valid;
- local attr = stanza.attr;
if attr.type == "valid" then
- s2s_make_authenticated(origin.dialback_verifying);
+ module:fire_event("s2s-authenticated", { session = dialback_verifying, host = attr.from });
valid = "valid";
else
-- Warn the original connection that is was not verified successfully
- log("warn", "dialback for "..(origin.dialback_verifying.from_host or "(unknown)").." failed");
+ log("warn", "authoritative server for %s denied the key", attr.from or "(unknown)");
valid = "invalid";
end
- if not origin.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(origin.dialback_verifying):match("%w+$"));
+ if dialback_verifying.destroyed then
+ log("warn", "Incoming s2s session %s was closed in the meantime, so we can't notify it of the db result", tostring(dialback_verifying):match("%w+$"));
else
- origin.dialback_verifying.sends2s(format("<db:result from='%s' to='%s' id='%s' type='%s'>%s</db:result>",
- attr.to, attr.from, attr.id, valid, origin.dialback_verifying.dialback_key));
+ 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.."/"..(attr.id or "")] = nil;
end
- end);
+ return true;
+ end
+end);
-add_handler({ "s2sout_unauthed", "s2sout" }, "result", xmlns_dialback,
- function (origin, stanza)
+module:hook("stanza/jabber:server:dialback:result", function(event)
+ local origin, stanza = event.origin, event.stanza;
+
+ if origin.type == "s2sout_unauthed" or origin.type == "s2sout" then
+ -- Remote server is telling us whether we passed dialback
+
+ local attr = stanza.attr;
+ if not hosts[attr.to] then
+ origin:close("host-unknown");
+ return true;
+ elseif hosts[attr.to].s2sout[attr.from] ~= origin then
+ -- This isn't right
+ origin:close("invalid-id");
+ return true;
+ end
if stanza.attr.type == "valid" then
- s2s_make_authenticated(origin);
+ module:fire_event("s2s-authenticated", { session = origin, host = attr.from });
else
- -- FIXME
- error("dialback failed!");
+ origin:close("not-authorized", "dialback authentication failed");
end
- end);
+ return true;
+ end
+end);
+
+module:hook_stanza(xmlns_stream, "features", function (origin, stanza)
+ if not origin.external_auth or origin.external_auth == "failed" then
+ module:log("debug", "Initiating dialback...");
+ initiate_dialback(origin);
+ return true;
+ end
+end, 100);
+
+module:hook("s2sout-authenticate-legacy", function (event)
+ module:log("debug", "Initiating dialback...");
+ initiate_dialback(event.origin);
+ return true;
+end, 100);
+
+-- Offer dialback to incoming hosts
+module:hook("s2s-stream-features", function (data)
+ data.features:tag("dialback", { xmlns='urn:xmpp:features:dialback' }):up();
+end);
projects / prosody.git / blobdiff