author | Kim Alvefur <zash@zash.se> |
Mon, 07 Mar 2022 00:35:29 +0100 | |
changeset 12392 | 50fcd3879482 |
parent 12267 | 168970ce8543 |
child 12448 | b33558969b3e |
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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local dbuffer = require "util.dbuffer"; |
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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 stanza_size_limit = module:get_option_number("c2s_stanza_size_limit", 1024 * 256); |
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local frame_buffer_limit = module:get_option_number("websocket_frame_buffer_limit", 2 * stanza_size_limit); |
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local frame_fragment_limit = module:get_option_number("websocket_frame_fragment_limit", 8); |
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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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|
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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 st.is_stanza(reason) then |
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stream_error = reason; |
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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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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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|
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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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103 |
add_task(stream_close_timeout, function () |
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104 |
if not session.destroyed then |
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105 |
session.log("warn", "Failed to receive a stream close response, closing connection anyway..."); |
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106 |
sm_destroy_session(session, reason); |
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107 |
conn:write(build_close(1000, "Stream closed")); |
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108 |
conn:close(); |
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109 |
end |
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110 |
end); |
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111 |
else |
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112 |
sm_destroy_session(session, reason); |
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113 |
conn:write(build_close(1000, "Stream closed")); |
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114 |
conn:close(); |
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115 |
end |
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116 |
end |
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117 |
end |
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118 |
|
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119 |
|
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120 |
--- Filters |
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121 |
local function filter_open_close(data) |
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122 |
if not data:find(xmlns_framing, 1, true) then return data; end |
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123 |
|
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124 |
local oc = parse_xml(data); |
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125 |
if not oc then return data; end |
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126 |
if oc.attr.xmlns ~= xmlns_framing then return data; end |
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127 |
if oc.name == "close" then return "</stream:stream>"; end |
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128 |
if oc.name == "open" then |
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129 |
oc.name = "stream:stream"; |
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oc.attr.xmlns = nil; |
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131 |
oc.attr["xmlns:stream"] = xmlns_streams; |
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132 |
return oc:top_tag(); |
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133 |
end |
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134 |
|
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135 |
return data; |
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136 |
end |
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137 |
|
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138 |
local default_get_response_text = "It works! Now point your WebSocket client to this URL to connect to Prosody." |
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139 |
local websocket_get_response_text = module:get_option_string("websocket_get_response_text", default_get_response_text) |
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140 |
|
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141 |
local default_get_response_body = [[<!DOCTYPE html><html><head><title>Websocket</title></head><body> |
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142 |
<p>]]..websocket_get_response_text..[[</p> |
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143 |
</body></html>]] |
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local websocket_get_response_body = module:get_option_string("websocket_get_response_body", default_get_response_body) |
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145 |
|
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146 |
local function validate_frame(frame, max_length) |
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147 |
local opcode, length = frame.opcode, frame.length; |
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148 |
|
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149 |
if max_length and length > max_length then |
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150 |
return false, 1009, "Payload too large"; |
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151 |
end |
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152 |
|
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153 |
-- Error cases |
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154 |
if frame.RSV1 or frame.RSV2 or frame.RSV3 then -- Reserved bits non zero |
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155 |
return false, 1002, "Reserved bits not zero"; |
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156 |
end |
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157 |
|
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158 |
if opcode == 0x8 and frame.data then -- close frame |
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159 |
if length == 1 then |
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160 |
return false, 1002, "Close frame with payload, but too short for status code"; |
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161 |
elseif length >= 2 then |
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162 |
local status_code = parse_close(frame.data) |
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163 |
if status_code < 1000 then |
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164 |
return false, 1002, "Closed with invalid status code"; |
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165 |
elseif ((status_code > 1003 and status_code < 1007) or status_code > 1011) and status_code < 3000 then |
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166 |
return false, 1002, "Closed with reserved status code"; |
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167 |
end |
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168 |
end |
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169 |
end |
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170 |
|
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171 |
if opcode >= 0x8 then |
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172 |
if length > 125 then -- Control frame with too much payload |
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173 |
return false, 1002, "Payload too large"; |
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174 |
end |
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|
175 |
|
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|
176 |
if not frame.FIN then -- Fragmented control frame |
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177 |
return false, 1002, "Fragmented control frame"; |
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178 |
end |
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|
179 |
end |
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|
180 |
|
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|
181 |
if (opcode > 0x2 and opcode < 0x8) or (opcode > 0xA) then |
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|
182 |
return false, 1002, "Reserved opcode"; |
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|
183 |
end |
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|
184 |
|
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|
185 |
-- Check opcode |
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|
186 |
if opcode == 0x2 then -- Binary frame |
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|
187 |
return false, 1003, "Only text frames are supported, RFC 7395 3.2"; |
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|
188 |
elseif opcode == 0x8 then -- Close request |
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|
189 |
return false, 1000, "Goodbye"; |
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|
190 |
end |
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|
191 |
|
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|
192 |
-- Other (XMPP-specific) validity checks |
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|
193 |
if not frame.FIN then |
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194 |
return false, 1003, "Continuation frames are not supported, RFC 7395 3.3.3"; |
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|
195 |
end |
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|
196 |
if opcode == 0x01 and frame.data and frame.data:byte(1, 1) ~= 60 then |
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197 |
return false, 1007, "Invalid payload start character, RFC 7395 3.3.3"; |
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198 |
end |
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199 |
|
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200 |
return true; |
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|
201 |
end |
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202 |
|
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203 |
|
6897
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|
204 |
function handle_request(event) |
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205 |
local request, response = event.request, event.response; |
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206 |
local conn = response.conn; |
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207 |
|
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mod_websocket: Set connections starttls method to false to prevent mod_tls from offering starttls (fixes #837)
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208 |
conn.starttls = false; -- Prevent mod_tls from believing starttls can be done |
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209 |
|
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if not request.headers.sec_websocket_key or request.method ~= "GET" then |
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return module:fire_event("http-message", { |
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response = event.response; |
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--- |
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title = "Prosody WebSocket endpoint"; |
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message = websocket_get_response_text; |
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warning = not (consider_websocket_secure or request.secure) and "This endpoint is not considered secure!" or nil; |
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}) or websocket_get_response_body; |
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end |
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|
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local wants_xmpp = contains_token(request.headers.sec_websocket_protocol or "", "xmpp"); |
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221 |
|
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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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225 |
end |
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226 |
|
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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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231 |
|
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local function websocket_handle_error(session, code, message) |
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if code == 1009 then -- stanza size limit exceeded |
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-- we close the session, rather than the connection, |
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-- otherwise a resuming client will simply resend the |
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236 |
-- offending stanza |
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session:close({ condition = "policy-violation", text = "stanza too large" }); |
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238 |
else |
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239 |
websocket_close(code, message); |
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240 |
end |
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241 |
end |
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242 |
|
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local function handle_frame(frame) |
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module:log("debug", "Websocket received frame: opcode=%0x, %i bytes", frame.opcode, #frame.data); |
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245 |
|
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246 |
-- Check frame makes sense |
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247 |
local frame_ok, err_status, err_text = validate_frame(frame, stanza_size_limit); |
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if not frame_ok then |
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return frame_ok, err_status, err_text; |
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250 |
end |
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251 |
|
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252 |
local opcode = frame.opcode; |
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253 |
if opcode == 0x9 then -- Ping frame |
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frame.opcode = 0xA; |
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255 |
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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257 |
return ""; |
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elseif opcode == 0xA then -- Pong frame, MAY be sent unsolicited, eg as keepalive |
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259 |
return ""; |
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elseif opcode ~= 0x1 then -- Not text frame (which is all we support) |
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|
261 |
log("warn", "Received frame with unsupported opcode %i", opcode); |
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262 |
return ""; |
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263 |
end |
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264 |
|
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265 |
return frame.data; |
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266 |
end |
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267 |
|
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268 |
conn:setlistener(c2s_listener); |
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269 |
c2s_listener.onconnect(conn); |
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270 |
|
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271 |
local session = sessions[conn]; |
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272 |
|
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273 |
-- Use upstream IP if a HTTP proxy was used |
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274 |
-- See mod_http and #540 |
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275 |
session.ip = request.ip; |
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276 |
|
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mod_websocket: Inherit security status from http request
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parents:
11118
diff
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|
277 |
session.secure = consider_websocket_secure or request.secure or session.secure; |
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|
278 |
session.websocket_request = request; |
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279 |
|
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280 |
session.open_stream = session_open_stream; |
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281 |
session.close = session_close; |
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282 |
|
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|
283 |
local frameBuffer = dbuffer.new(frame_buffer_limit, frame_fragment_limit); |
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284 |
add_filter(session, "bytes/in", function(data) |
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|
285 |
if not frameBuffer:write(data) then |
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286 |
session.log("warn", "websocket frame buffer full - terminating session"); |
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287 |
session:close({ condition = "resource-constraint", text = "frame buffer exceeded" }); |
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288 |
return; |
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289 |
end |
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290 |
|
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291 |
local cache = {}; |
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292 |
local frame, length, partial = parse_frame(frameBuffer); |
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293 |
|
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294 |
while frame do |
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295 |
frameBuffer:discard(length); |
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296 |
local result, err_status, err_text = handle_frame(frame); |
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297 |
if not result then |
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298 |
websocket_handle_error(session, err_status, err_text); |
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299 |
break; |
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300 |
end |
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|
301 |
cache[#cache+1] = filter_open_close(result); |
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302 |
frame, length, partial = parse_frame(frameBuffer); |
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303 |
end |
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304 |
|
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|
305 |
if partial then |
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|
306 |
-- The header of the next frame is already in the buffer, run |
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|
307 |
-- some early validation here |
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|
308 |
local frame_ok, err_status, err_text = validate_frame(partial, stanza_size_limit); |
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|
309 |
if not frame_ok then |
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310 |
websocket_handle_error(session, err_status, err_text); |
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|
311 |
end |
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|
312 |
end |
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313 |
|
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|
314 |
return t_concat(cache, ""); |
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315 |
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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|
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module:fire_event("websocket-session", { session = session, request = request }); |
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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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function module.add_host(module) |
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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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|
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module:hook("c2s-read-timeout", keepalive, -0.9); |
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end |
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|
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if require"core.modulemanager".get_modules_for_host("*"):contains(module.name) then |
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module:add_host(); |
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end |