-- Prosody IM -- Copyright (C) 2012-2014 Florian Zeitz -- -- This project is MIT/X11 licensed. Please see the -- COPYING file in the source package for more information. -- module:set_global(); local add_filter = require "util.filters".add_filter; local sha1 = require "util.hashes".sha1; local base64 = require "util.encodings".base64.encode; local st = require "util.stanza"; local parse_xml = require "util.xml".parse; local portmanager = require "core.portmanager"; local sm_destroy_session = sessionmanager.destroy_session; local log = module._log; local websocket_frames = require"net.websocket.frames"; local parse_frame = websocket_frames.parse; local build_frame = websocket_frames.build; local build_close = websocket_frames.build_close; local parse_close = websocket_frames.parse_close; local t_concat = table.concat; local consider_websocket_secure = module:get_option_boolean("consider_websocket_secure"); local cross_domain = module:get_option("cross_domain_websocket"); if cross_domain then if cross_domain == true then cross_domain = "*"; elseif type(cross_domain) == "table" then cross_domain = t_concat(cross_domain, ", "); end if type(cross_domain) ~= "string" then cross_domain = nil; end end local xmlns_framing = "urn:ietf:params:xml:ns:xmpp-framing"; local xmlns_streams = "http://etherx.jabber.org/streams"; local xmlns_client = "jabber:client"; local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'}; module:depends("c2s") local sessions = module:shared("c2s/sessions"); local c2s_listener = portmanager.get_service("c2s").listener; --- Session methods local function session_open_stream(session) local attr = { xmlns = xmlns_framing, version = "1.0", id = session.streamid or "", from = session.host }; session.send(st.stanza("open", attr)); end local function session_close(session, reason) local log = session.log or log; if session.conn then if session.notopen then session:open_stream(); 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 log("debug", "Disconnecting client, <stream:error> is: %s", tostring(stream_error)); session.send(stream_error); end session.send(st.stanza("close", { xmlns = xmlns_framing })); function session.send() return false; end local reason = (reason and (reason.name or reason.text or reason.condition)) or reason; session.log("debug", "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:write(build_close(1000, "Stream closed")); conn:close(); end end); else sm_destroy_session(session, reason); conn:write(build_close(1000, "Stream closed")); conn:close(); end end end --- Filters local function filter_open_close(data) if not data:find(xmlns_framing, 1, true) then return data; end local oc = parse_xml(data); if not oc then return data; end if oc.attr.xmlns ~= xmlns_framing then return data; end if oc.name == "close" then return "</stream:stream>"; end if oc.name == "open" then oc.name = "stream:stream"; oc.attr.xmlns = nil; oc.attr["xmlns:stream"] = xmlns_streams; return oc:top_tag(); end return data; end function handle_request(event, path) local request, response = event.request, event.response; local conn = response.conn; if not request.headers.sec_websocket_key then response.headers.content_type = "text/html"; return [[<!DOCTYPE html><html><head><title>Websocket</title></head><body> <p>It works! Now point your WebSocket client to this URL to connect to Prosody.</p> </body></html>]]; end local wants_xmpp = false; (request.headers.sec_websocket_protocol or ""):gsub("([^,]*),?", function (proto) if proto == "xmpp" then wants_xmpp = true; end end); if not wants_xmpp then return 501; end local function websocket_close(code, message) conn:write(build_close(code, message)); conn:close(); end local dataBuffer; local function handle_frame(frame) local opcode = frame.opcode; local length = frame.length; module:log("debug", "Websocket received frame: opcode=%0x, %i bytes", frame.opcode, #frame.data); -- Error cases if frame.RSV1 or frame.RSV2 or frame.RSV3 then -- Reserved bits non zero websocket_close(1002, "Reserved bits not zero"); return false; end if opcode == 0x8 then -- close frame if length == 1 then websocket_close(1002, "Close frame with payload, but too short for status code"); return false; elseif length >= 2 then local status_code = parse_close(frame.data) if status_code < 1000 then websocket_close(1002, "Closed with invalid status code"); return false; elseif ((status_code > 1003 and status_code < 1007) or status_code > 1011) and status_code < 3000 then websocket_close(1002, "Closed with reserved status code"); return false; end end end if opcode >= 0x8 then if length > 125 then -- Control frame with too much payload websocket_close(1002, "Payload too large"); return false; end if not frame.FIN then -- Fragmented control frame websocket_close(1002, "Fragmented control frame"); return false; end end if (opcode > 0x2 and opcode < 0x8) or (opcode > 0xA) then websocket_close(1002, "Reserved opcode"); return false; end if opcode == 0x0 and not dataBuffer then websocket_close(1002, "Unexpected continuation frame"); return false; end if (opcode == 0x1 or opcode == 0x2) and dataBuffer then websocket_close(1002, "Continuation frame expected"); return false; end -- Valid cases if opcode == 0x0 then -- Continuation frame dataBuffer[#dataBuffer+1] = frame.data; elseif opcode == 0x1 then -- Text frame dataBuffer = {frame.data}; elseif opcode == 0x2 then -- Binary frame websocket_close(1003, "Only text frames are supported"); return; elseif opcode == 0x8 then -- Close request websocket_close(1000, "Goodbye"); return; elseif opcode == 0x9 then -- Ping frame frame.opcode = 0xA; conn:write(build_frame(frame)); return ""; elseif opcode == 0xA then -- Pong frame module:log("warn", "Received unexpected pong frame: " .. tostring(frame.data)); return ""; else log("warn", "Received frame with unsupported opcode %i", opcode); return ""; end if frame.FIN then local data = t_concat(dataBuffer, ""); dataBuffer = nil; return data; end return ""; end conn:setlistener(c2s_listener); c2s_listener.onconnect(conn); local session = sessions[conn]; session.secure = consider_websocket_secure or session.secure; session.open_stream = session_open_stream; session.close = session_close; local frameBuffer = ""; add_filter(session, "bytes/in", function(data) local cache = {}; frameBuffer = frameBuffer .. data; local frame, length = parse_frame(frameBuffer); while frame do frameBuffer = frameBuffer:sub(length + 1); local result = handle_frame(frame); if not result then return; end cache[#cache+1] = filter_open_close(result); frame, length = parse_frame(frameBuffer); end return t_concat(cache, ""); end); add_filter(session, "stanzas/out", function(stanza) local attr = stanza.attr; attr.xmlns = attr.xmlns or xmlns_client; if stanza.name:find("^stream:") then attr["xmlns:stream"] = attr["xmlns:stream"] or xmlns_streams; end return stanza; end); add_filter(session, "bytes/out", function(data) return build_frame({ FIN = true, opcode = 0x01, data = tostring(data)}); end); response.status_code = 101; response.headers.upgrade = "websocket"; response.headers.connection = "Upgrade"; response.headers.sec_webSocket_accept = base64(sha1(request.headers.sec_websocket_key .. "258EAFA5-E914-47DA-95CA-C5AB0DC85B11")); response.headers.sec_webSocket_protocol = "xmpp"; response.headers.access_control_allow_origin = cross_domain; return ""; end function module.add_host(module) module:depends("http"); module:provides("http", { name = "websocket"; default_path = "xmpp-websocket"; route = { ["GET"] = handle_request; ["GET /"] = handle_request; }; }); end