+-- 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 hosts = _G.hosts;
local s2s_make_authenticated = require "core.s2smanager".make_authenticated;
-local s2s_verify_dialback = require "core.s2smanager".verify_dialback;
-
-local log = require "util.logger".init("mod_dialback");
-
-local xmlns_dialback = "jabber:server:dialback";
-
-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"
+
+local log = module._log;
+
+local st = require "util.stanza";
+local sha256_hash = require "util.hashes".sha256;
+local nameprep = require "util.encodings".stringprep.nameprep;
+
+local xmlns_stream = "http://etherx.jabber.org/streams";
+
+local dialback_requests = setmetatable({}, { __mode = 'v' });
+
+function generate_dialback(id, to, from)
+ return sha256_hash(id..to..from..hosts[from].dialback_secret, true);
+end
+
+function initiate_dialback(session)
+ -- generate dialback key
+ session.dialback_key = generate_dialback(session.streamid, session.to_host, session.from_host);
+ session.sends2s(format("<db:result from='%s' to='%s'>%s</db:result>", session.from_host, session.to_host, session.dialback_key));
+ session.log("info", "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
+ origin.log("debug", "verifying that dialback key is ours...");
+ local attr = stanza.attr;
+ -- 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 verify_dialback(attr.id, attr.from, attr.to, stanza[1]) then
+ type = "valid"
+ else
+ type = "invalid"
+ origin.log("warn", "Asked to verify a dialback key that was incorrect. An imposter is claiming to be %s?", attr.to);
+ 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);
+
+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;
+ origin.hosts[attr.from] = { dialback_key = stanza[1] };
+
+ if not hosts[attr.to] then
+ -- Not a host that we serve
+ origin.log("info", "%s tried to connect to %s, which we don't serve", attr.from, attr.to);
+ origin:close("host-unknown");
+ return true;
+ end
+
+ dialback_requests[attr.from.."/"..origin.streamid] = origin;
+
+ local compat_check;
+ if not origin.from_host then
+ -- Just used for friendlier logging
+ origin.from_host = nameprep(attr.from);
+ -- COMPAT: Fix server's chopness by not including from
+ compat_check = true;
+ end
+ if not origin.to_host then
+ -- Just used for friendlier logging
+ origin.to_host = nameprep(attr.to);
+ -- COMPAT: Fix server's chopness by not including to
+ compat_check = true;
+ end
+
+ if not origin.from_host and not origin.to_host then
+ origin.log("debug", "Improper addressing supplied, no to or from?");
+ origin:close("improper-addressing");
+ end
+ -- COMPAT: reset session.send
+ if compat_check then
+ origin.send = function(stanza) hosts[attr.to].events.fire_event("route/remote", { from_host = origin.to_host, to_host = origin.from_host, stanza = stanza}); end
+ end
+
+ origin.log("debug", "asking %s if key %s belongs to them", attr.from, stanza[1]);
+ origin.send(st.stanza("db:verify", { from = attr.to, to = attr.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;
+ local dialback_verifying = dialback_requests[attr.from.."/"..(attr.id or "")];
+ module:log("debug", tostring(dialback_verifying).." "..attr.from.." "..origin.to_host);
+ if dialback_verifying and attr.from == origin.to_host then
+ local valid;
+ if attr.type == "valid" then
+ s2s_make_authenticated(dialback_verifying, attr.from);
+ valid = "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
- 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);
-
-add_handler("s2sin_unauthed", "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;
- 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.from_host].dialback_verifying = origin;
- end);
-
-add_handler({ "s2sout_unauthed", "s2sout" }, "verify", xmlns_dialback,
- function (origin, stanza)
- if origin.dialback_verifying then
- local valid;
- local attr = stanza.attr;
- if attr.type == "valid" then
- s2s_make_authenticated(origin.dialback_verifying);
- 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");
- valid = "invalid";
- end
- origin.dialback_verifying.sends2s(format("<db:result from='%s' to='%s' id='%s' type='%s'>%s</db:result>", attr.from, attr.to, attr.id, valid, origin.dialback_verifying.dialback_key));
+ -- 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
- end);
-
-add_handler({ "s2sout_unauthed", "s2sout" }, "result", xmlns_dialback,
- function (origin, stanza)
- if stanza.attr.type == "valid" then
- s2s_make_authenticated(origin);
+ 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
- -- FIXME
- error("dialback failed!");
+ 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
- end);
\ No newline at end of file
+ dialback_requests[attr.from.."/"..(attr.id or "")] = nil;
+ end
+ return true;
+ end
+end);
+
+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, attr.from);
+ else
+ origin:close("not-authorized", "dialback authentication failed");
+ end
+ return true;
+ end
+end);
+
+module:hook_stanza("urn:ietf:params:xml:ns:xmpp-sasl", "failure", function (origin, stanza)
+ if origin.external_auth == "failed" then
+ module:log("debug", "SASL EXTERNAL failed, falling back to dialback");
+ initiate_dialback(origin);
+ return true;
+ end
+end, 100);
+
+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("s2s-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