-- 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. -- module:set_global(); local add_task = require "util.timer".add_task; local new_xmpp_stream = require "util.xmppstream".new; local nameprep = require "util.encodings".stringprep.nameprep; local sessionmanager = require "core.sessionmanager"; local st = require "util.stanza"; local sm_new_session, sm_destroy_session = sessionmanager.new_session, sessionmanager.destroy_session; local uuid_generate = require "util.uuid".generate; local xpcall, tostring, type = xpcall, tostring, type; local traceback = debug.traceback; local xmlns_xmpp_streams = "urn:ietf:params:xml:ns:xmpp-streams"; local log = module._log; local c2s_timeout = module:get_option_number("c2s_timeout"); local stream_close_timeout = module:get_option_number("c2s_close_timeout", 5); local opt_keepalives = module:get_option_boolean("c2s_tcp_keepalives", module:get_option_boolean("tcp_keepalives", true)); local sessions = module:shared("sessions"); local core_process_stanza = prosody.core_process_stanza; local hosts = prosody.hosts; local stream_callbacks = { default_ns = "jabber:client", handlestanza = core_process_stanza }; local listener = {}; --- Stream events handlers local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'}; local default_stream_attr = { ["xmlns:stream"] = "http://etherx.jabber.org/streams", xmlns = stream_callbacks.default_ns, version = "1.0", id = "" }; function stream_callbacks.streamopened(session, attr) local send = session.send; session.host = nameprep(attr.to); if not session.host then session:close{ condition = "improper-addressing", text = "A valid 'to' attribute is required on stream headers" }; return; end session.version = tonumber(attr.version) or 0; session.streamid = uuid_generate(); (session.log or session)("debug", "Client sent opening <stream:stream> to %s", session.host); if not hosts[session.host] or not hosts[session.host].users then -- We don't serve this host... session:close{ condition = "host-unknown", text = "This server does not serve "..tostring(session.host)}; return; end send("<?xml version='1.0'?>"..st.stanza("stream:stream", { xmlns = 'jabber:client', ["xmlns:stream"] = 'http://etherx.jabber.org/streams'; id = session.streamid, from = session.host, version = '1.0', ["xml:lang"] = 'en' }):top_tag()); (session.log or log)("debug", "Sent reply <stream:stream> to client"); session.notopen = nil; -- If session.secure is *false* (not nil) then it means we /were/ encrypting -- since we now have a new stream header, session is secured if session.secure == false then session.secure = true; -- Check if TLS compression is used local sock = session.conn:socket(); if sock.info then session.compressed = sock:info"compression"; elseif sock.compression then session.compressed = sock:compression(); --COMPAT mw/luasec-hg end end local features = st.stanza("stream:features"); hosts[session.host].events.fire_event("stream-features", { origin = session, features = features }); module:fire_event("stream-features", session, features); send(features); end function stream_callbacks.streamclosed(session) session.log("debug", "Received </stream:stream>"); session:close(false); end function stream_callbacks.error(session, error, data) if error == "no-stream" then session.log("debug", "Invalid opening stream header (%s)", (data:gsub("^([^\1]+)\1", "{%1}"))); session:close("invalid-namespace"); elseif error == "parse-error" then (session.log or log)("debug", "Client XML parse error: %s", tostring(data)); session:close("not-well-formed"); elseif error == "stream-error" then local condition, text = "undefined-condition"; for child in data:children() do if child.attr.xmlns == xmlns_xmpp_streams then if child.name ~= "text" then condition = child.name; else text = child:get_text(); end if condition ~= "undefined-condition" and text then break; end end end text = condition .. (text and (" ("..text..")") or ""); session.log("info", "Session closed by remote with error: %s", text); session:close(nil, text); end end local function handleerr(err) log("error", "Traceback[c2s]: %s", traceback(tostring(err), 2)); end function stream_callbacks.handlestanza(session, stanza) stanza = session.filter("stanzas/in", stanza); if stanza then return xpcall(function () return core_process_stanza(session, stanza) end, handleerr); end end --- Session methods local function session_close(session, reason) local log = session.log or log; if session.conn then if session.notopen then session.send("<?xml version='1.0'?>"); session.send(st.stanza("stream:stream", default_stream_attr):top_tag()); end if reason then -- nil == no err, initiated by us, false == initiated by client local stream_error = st.stanza("stream:error"); if type(reason) == "string" then -- assume stream error stream_error:tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }); elseif type(reason) == "table" then if reason.condition then stream_error:tag(reason.condition, stream_xmlns_attr):up(); if reason.text then stream_error:tag("text", stream_xmlns_attr):text(reason.text):up(); end if reason.extra then stream_error:add_child(reason.extra); end elseif reason.name then -- a stanza stream_error = reason; end end stream_error = tostring(stream_error); log("debug", "Disconnecting client, <stream:error> is: %s", stream_error); session.send(stream_error); end session.send("</stream:stream>"); function session.send() return false; end local reason = (reason and (reason.name or reason.text or reason.condition)) or reason; session.log("info", "c2s stream for %s closed: %s", session.full_jid or ("<"..session.ip..">"), reason or "session closed"); -- Authenticated incoming stream may still be sending us stanzas, so wait for </stream:stream> from remote local conn = session.conn; if reason == nil and not session.notopen and session.type == "c2s" then -- Grace time to process data from authenticated cleanly-closed stream add_task(stream_close_timeout, function () if not session.destroyed then session.log("warn", "Failed to receive a stream close response, closing connection anyway..."); sm_destroy_session(session, reason); conn:close(); end end); else sm_destroy_session(session, reason); conn:close(); end end end module:hook_global("user-deleted", function(event) local username, host = event.username, event.host; local user = hosts[host].sessions[username]; if user and user.sessions then for jid, session in pairs(user.sessions) do session:close{ condition = "not-authorized", text = "Account deleted" }; end end end, 200); --- Port listener function listener.onconnect(conn) local session = sm_new_session(conn); sessions[conn] = session; session.log("info", "Client connected"); -- Client is using legacy SSL (otherwise mod_tls sets this flag) if conn:ssl() then session.secure = true; -- Check if TLS compression is used local sock = conn:socket(); if sock.info then session.compressed = sock:info"compression"; elseif sock.compression then session.compressed = sock:compression(); --COMPAT mw/luasec-hg end end if opt_keepalives then conn:setoption("keepalive", opt_keepalives); end session.close = session_close; local stream = new_xmpp_stream(session, stream_callbacks); session.stream = stream; session.notopen = true; function session.reset_stream() session.notopen = true; session.stream:reset(); end local filter = session.filter; function session.data(data) data = filter("bytes/in", data); if data then local ok, err = stream:feed(data); if ok then return; end log("debug", "Received invalid XML (%s) %d bytes: %s", tostring(err), #data, data:sub(1, 300):gsub("[\r\n]+", " "):gsub("[%z\1-\31]", "_")); session:close("not-well-formed"); end end if c2s_timeout then add_task(c2s_timeout, function () if session.type == "c2s_unauthed" then session:close("connection-timeout"); end end); end session.dispatch_stanza = stream_callbacks.handlestanza; end function listener.onincoming(conn, data) local session = sessions[conn]; if session then session.data(data); end end function listener.ondisconnect(conn, err) local session = sessions[conn]; if session then (session.log or log)("info", "Client disconnected: %s", err or "connection closed"); sm_destroy_session(session, err); sessions[conn] = nil; end end function listener.associate_session(conn, session) sessions[conn] = session; end module:hook("server-stopping", function(event) local reason = event.reason; for _, session in pairs(sessions) do session:close{ condition = "system-shutdown", text = reason }; end end, 1000); module:provides("net", { name = "c2s"; listener = listener; default_port = 5222; encryption = "starttls"; multiplex = { pattern = "^<.*:stream.*%sxmlns%s*=%s*(['\"])jabber:client%1.*>"; }; }); module:provides("net", { name = "legacy_ssl"; listener = listener; encryption = "ssl"; multiplex = { pattern = "^<.*:stream.*%sxmlns%s*=%s*(['\"])jabber:client%1.*>"; }; });