author | Kim Alvefur <zash@zash.se> |
Tue, 22 Jan 2019 10:44:24 +0100 | |
changeset 9810 | b72d2f4153f7 |
parent 9805 | b87cd83a2685 |
parent 9809 | 7bfc4269dc36 |
child 10101 | 1f45d316b222 |
permissions | -rw-r--r-- |
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-- 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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|
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module:set_global(); |
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|
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mod_websocket: Import util.timer and session close timeout config option (thanks fairuz)
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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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|
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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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|
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local t_concat = table.concat; |
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|
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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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|
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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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|
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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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|
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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", tostring(stream_error)); |
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session.send(stream_error); |
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end |
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|
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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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|
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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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|
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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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105 |
end |
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end); |
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107 |
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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111 |
end |
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112 |
end |
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113 |
end |
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114 |
|
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115 |
|
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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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119 |
|
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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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|
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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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|
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conn.starttls = false; -- Prevent mod_tls from believing starttls can be done |
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138 |
|
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if not request.headers.sec_websocket_key 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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144 |
end |
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local wants_xmpp = contains_token(request.headers.sec_websocket_protocol or "", "xmpp"); |
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|
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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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151 |
end |
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152 |
|
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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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156 |
end |
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157 |
|
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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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163 |
|
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164 |
-- 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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168 |
end |
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169 |
|
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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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182 |
end |
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183 |
end |
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184 |
end |
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185 |
|
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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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189 |
return false; |
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190 |
end |
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191 |
|
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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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195 |
end |
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196 |
end |
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197 |
|
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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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201 |
end |
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202 |
|
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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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206 |
end |
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207 |
|
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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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211 |
end |
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212 |
|
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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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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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|
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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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|
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conn:setlistener(c2s_listener); |
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c2s_listener.onconnect(conn); |
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|
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local session = sessions[conn]; |
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|
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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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|
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session.secure = consider_websocket_secure or session.secure; |
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session.websocket_request = request; |
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|
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session.open_stream = session_open_stream; |
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session.close = session_close; |
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|
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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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|
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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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|
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add_filter(session, "stanzas/out", function(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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|
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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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|
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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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|
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session.log("debug", "Sending WebSocket handshake"); |
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|
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return ""; |
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end |
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|
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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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|
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module:hook("c2s-read-timeout", keepalive, -0.9); |
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|
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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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|
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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 |