mirror of
https://github.com/bjc/prosody.git
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321 lines
9.9 KiB
Lua
321 lines
9.9 KiB
Lua
-- Prosody IM
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-- Copyright (C) 2012-2014 Florian Zeitz
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--
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-- This project is MIT/X11 licensed. Please see the
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-- COPYING file in the source package for more information.
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--
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-- luacheck: ignore 431/log
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module:set_global();
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local add_task = require "util.timer".add_task;
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local add_filter = require "util.filters".add_filter;
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local sha1 = require "util.hashes".sha1;
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local base64 = require "util.encodings".base64.encode;
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local st = require "util.stanza";
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local parse_xml = require "util.xml".parse;
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local contains_token = require "util.http".contains_token;
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local portmanager = require "core.portmanager";
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local sm_destroy_session = require"core.sessionmanager".destroy_session;
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local log = module._log;
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local websocket_frames = require"net.websocket.frames";
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local parse_frame = websocket_frames.parse;
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local build_frame = websocket_frames.build;
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local build_close = websocket_frames.build_close;
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local parse_close = websocket_frames.parse_close;
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local t_concat = table.concat;
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local stream_close_timeout = module:get_option_number("c2s_close_timeout", 5);
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local consider_websocket_secure = module:get_option_boolean("consider_websocket_secure");
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local cross_domain = module:get_option("cross_domain_websocket");
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if cross_domain ~= nil then
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module:log("info", "The 'cross_domain_websocket' option has been deprecated");
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end
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local xmlns_framing = "urn:ietf:params:xml:ns:xmpp-framing";
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local xmlns_streams = "http://etherx.jabber.org/streams";
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local xmlns_client = "jabber:client";
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local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
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module:depends("c2s")
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local sessions = module:shared("c2s/sessions");
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local c2s_listener = portmanager.get_service("c2s").listener;
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--- Session methods
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local function session_open_stream(session, from, to)
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local attr = {
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xmlns = xmlns_framing,
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["xml:lang"] = "en",
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version = "1.0",
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id = session.streamid or "",
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from = from or session.host, to = to,
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};
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if session.stream_attrs then
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session:stream_attrs(from, to, attr)
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end
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session.send(st.stanza("open", attr));
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end
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local function session_close(session, reason)
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local log = session.log or log;
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if session.conn then
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if session.notopen then
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session:open_stream();
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end
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if reason then -- nil == no err, initiated by us, false == initiated by client
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local stream_error = st.stanza("stream:error");
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if type(reason) == "string" then -- assume stream error
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stream_error:tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' });
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elseif type(reason) == "table" then
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if reason.condition then
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stream_error:tag(reason.condition, stream_xmlns_attr):up();
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if reason.text then
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stream_error:tag("text", stream_xmlns_attr):text(reason.text):up();
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end
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if reason.extra then
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stream_error:add_child(reason.extra);
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end
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elseif reason.name then -- a stanza
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stream_error = reason;
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end
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end
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log("debug", "Disconnecting client, <stream:error> is: %s", stream_error);
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session.send(stream_error);
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end
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session.send(st.stanza("close", { xmlns = xmlns_framing }));
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function session.send() return false; end
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-- luacheck: ignore 422/reason
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-- FIXME reason should be handled in common place
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local reason = (reason and (reason.name or reason.text or reason.condition)) or reason;
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session.log("debug", "c2s stream for %s closed: %s", session.full_jid or ("<"..session.ip..">"), reason or "session closed");
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-- Authenticated incoming stream may still be sending us stanzas, so wait for </stream:stream> from remote
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local conn = session.conn;
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if reason == nil and not session.notopen and session.type == "c2s" then
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-- Grace time to process data from authenticated cleanly-closed stream
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add_task(stream_close_timeout, function ()
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if not session.destroyed then
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session.log("warn", "Failed to receive a stream close response, closing connection anyway...");
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sm_destroy_session(session, reason);
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conn:write(build_close(1000, "Stream closed"));
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conn:close();
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end
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end);
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else
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sm_destroy_session(session, reason);
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conn:write(build_close(1000, "Stream closed"));
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conn:close();
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end
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end
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end
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--- Filters
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local function filter_open_close(data)
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if not data:find(xmlns_framing, 1, true) then return data; end
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local oc = parse_xml(data);
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if not oc then return data; end
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if oc.attr.xmlns ~= xmlns_framing then return data; end
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if oc.name == "close" then return "</stream:stream>"; end
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if oc.name == "open" then
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oc.name = "stream:stream";
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oc.attr.xmlns = nil;
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oc.attr["xmlns:stream"] = xmlns_streams;
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return oc:top_tag();
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end
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return data;
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end
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function handle_request(event)
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local request, response = event.request, event.response;
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local conn = response.conn;
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conn.starttls = false; -- Prevent mod_tls from believing starttls can be done
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if not request.headers.sec_websocket_key or request.method ~= "GET" then
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response.headers.content_type = "text/html";
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return [[<!DOCTYPE html><html><head><title>Websocket</title></head><body>
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<p>It works! Now point your WebSocket client to this URL to connect to Prosody.</p>
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</body></html>]];
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end
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local wants_xmpp = contains_token(request.headers.sec_websocket_protocol or "", "xmpp");
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if not wants_xmpp then
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module:log("debug", "Client didn't want to talk XMPP, list of protocols was %s", request.headers.sec_websocket_protocol or "(empty)");
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return 501;
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end
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local function websocket_close(code, message)
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conn:write(build_close(code, message));
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conn:close();
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end
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local dataBuffer;
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local function handle_frame(frame)
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local opcode = frame.opcode;
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local length = frame.length;
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module:log("debug", "Websocket received frame: opcode=%0x, %i bytes", frame.opcode, #frame.data);
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-- Error cases
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if frame.RSV1 or frame.RSV2 or frame.RSV3 then -- Reserved bits non zero
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websocket_close(1002, "Reserved bits not zero");
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return false;
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end
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if opcode == 0x8 then -- close frame
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if length == 1 then
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websocket_close(1002, "Close frame with payload, but too short for status code");
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return false;
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elseif length >= 2 then
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local status_code = parse_close(frame.data)
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if status_code < 1000 then
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websocket_close(1002, "Closed with invalid status code");
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return false;
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elseif ((status_code > 1003 and status_code < 1007) or status_code > 1011) and status_code < 3000 then
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websocket_close(1002, "Closed with reserved status code");
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return false;
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end
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end
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end
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if opcode >= 0x8 then
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if length > 125 then -- Control frame with too much payload
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websocket_close(1002, "Payload too large");
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return false;
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end
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if not frame.FIN then -- Fragmented control frame
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websocket_close(1002, "Fragmented control frame");
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return false;
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end
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end
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if (opcode > 0x2 and opcode < 0x8) or (opcode > 0xA) then
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websocket_close(1002, "Reserved opcode");
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return false;
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end
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if opcode == 0x0 and not dataBuffer then
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websocket_close(1002, "Unexpected continuation frame");
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return false;
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end
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if (opcode == 0x1 or opcode == 0x2) and dataBuffer then
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websocket_close(1002, "Continuation frame expected");
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return false;
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end
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-- Valid cases
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if opcode == 0x0 then -- Continuation frame
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dataBuffer[#dataBuffer+1] = frame.data;
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elseif opcode == 0x1 then -- Text frame
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dataBuffer = {frame.data};
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elseif opcode == 0x2 then -- Binary frame
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websocket_close(1003, "Only text frames are supported");
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return;
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elseif opcode == 0x8 then -- Close request
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websocket_close(1000, "Goodbye");
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return;
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elseif opcode == 0x9 then -- Ping frame
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frame.opcode = 0xA;
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frame.MASK = false; -- Clients send masked frames, servers don't, see #1484
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conn:write(build_frame(frame));
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return "";
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elseif opcode == 0xA then -- Pong frame, MAY be sent unsolicited, eg as keepalive
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return "";
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else
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log("warn", "Received frame with unsupported opcode %i", opcode);
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return "";
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end
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if frame.FIN then
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local data = t_concat(dataBuffer, "");
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dataBuffer = nil;
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return data;
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end
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return "";
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end
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conn:setlistener(c2s_listener);
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c2s_listener.onconnect(conn);
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local session = sessions[conn];
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-- Use upstream IP if a HTTP proxy was used
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-- See mod_http and #540
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session.ip = request.ip;
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session.secure = consider_websocket_secure or session.secure;
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session.websocket_request = request;
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session.open_stream = session_open_stream;
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session.close = session_close;
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local frameBuffer = "";
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add_filter(session, "bytes/in", function(data)
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local cache = {};
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frameBuffer = frameBuffer .. data;
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local frame, length = parse_frame(frameBuffer);
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while frame do
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frameBuffer = frameBuffer:sub(length + 1);
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local result = handle_frame(frame);
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if not result then return; end
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cache[#cache+1] = filter_open_close(result);
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frame, length = parse_frame(frameBuffer);
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end
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return t_concat(cache, "");
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end);
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add_filter(session, "stanzas/out", function(stanza)
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stanza = st.clone(stanza);
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local attr = stanza.attr;
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attr.xmlns = attr.xmlns or xmlns_client;
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if stanza.name:find("^stream:") then
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attr["xmlns:stream"] = attr["xmlns:stream"] or xmlns_streams;
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end
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return stanza;
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end, -1000);
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add_filter(session, "bytes/out", function(data)
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return build_frame({ FIN = true, opcode = 0x01, data = tostring(data)});
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end);
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response.status_code = 101;
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response.headers.upgrade = "websocket";
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response.headers.connection = "Upgrade";
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response.headers.sec_webSocket_accept = base64(sha1(request.headers.sec_websocket_key .. "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"));
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response.headers.sec_webSocket_protocol = "xmpp";
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session.log("debug", "Sending WebSocket handshake");
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return "";
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end
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local function keepalive(event)
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local session = event.session;
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if session.open_stream == session_open_stream then
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return session.conn:write(build_frame({ opcode = 0x9, FIN = true }));
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end
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end
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module:hook("c2s-read-timeout", keepalive, -0.9);
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module:depends("http");
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module:provides("http", {
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name = "websocket";
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default_path = "xmpp-websocket";
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route = {
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["GET"] = handle_request;
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["GET /"] = handle_request;
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};
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});
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function module.add_host(module)
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module:hook("c2s-read-timeout", keepalive, -0.9);
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end
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