prosody
9dc34e1556d9
plugins/mod_websocket.lua

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plugins/mod_websocket.lua @ 10911:9dc34e1556d9

util.human.io.table: Allow a map callaback per column This allows e.g. mapping booleans to "yes" or "no", specific number formatting or generating virtual columns. All while not mutating the underlying data or creating additional temporary tables.
author Kim Alvefur <zash@zash.se>
date Thu, 04 Jun 2020 21:32:28 +0200
parent 10728:2764beb552cd
child 11114:6a608ecb3471
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 -- Prosody IM
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2 -- Copyright (C) 2012-2014 Florian Zeitz
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3 --
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4 -- This project is MIT/X11 licensed. Please see the
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5 -- COPYING file in the source package for more information.
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6 --
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7 -- luacheck: ignore 431/log
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8
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9 module:set_global();
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10
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11 local add_task = require "util.timer".add_task;
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12 local add_filter = require "util.filters".add_filter;
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13 local sha1 = require "util.hashes".sha1;
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14 local base64 = require "util.encodings".base64.encode;
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15 local st = require "util.stanza";
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16 local parse_xml = require "util.xml".parse;
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17 local contains_token = require "util.http".contains_token;
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18 local portmanager = require "core.portmanager";
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19 local sm_destroy_session = require"core.sessionmanager".destroy_session;
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20 local log = module._log;
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21
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22 local websocket_frames = require"net.websocket.frames";
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23 local parse_frame = websocket_frames.parse;
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24 local build_frame = websocket_frames.build;
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25 local build_close = websocket_frames.build_close;
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26 local parse_close = websocket_frames.parse_close;
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27
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28 local t_concat = table.concat;
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29
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30 local stream_close_timeout = module:get_option_number("c2s_close_timeout", 5);
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31 local consider_websocket_secure = module:get_option_boolean("consider_websocket_secure");
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32 local cross_domain = module:get_option("cross_domain_websocket");
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33 if cross_domain ~= nil then
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34 module:log("info", "The 'cross_domain_websocket' option has been deprecated");
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35 end
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36 local xmlns_framing = "urn:ietf:params:xml:ns:xmpp-framing";
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37 local xmlns_streams = "http://etherx.jabber.org/streams";
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38 local xmlns_client = "jabber:client";
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39 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
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40
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41 module:depends("c2s")
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42 local sessions = module:shared("c2s/sessions");
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43 local c2s_listener = portmanager.get_service("c2s").listener;
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44
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45 --- Session methods
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46 local function session_open_stream(session, from, to)
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47 local attr = {
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48 xmlns = xmlns_framing,
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49 ["xml:lang"] = "en",
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50 version = "1.0",
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51 id = session.streamid or "",
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52 from = from or session.host, to = to,
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53 };
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54 if session.stream_attrs then
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55 session:stream_attrs(from, to, attr)
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56 end
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57 session.send(st.stanza("open", attr));
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58 end
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59
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60 local function session_close(session, reason)
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61 local log = session.log or log;
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62 if session.conn then
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63 if session.notopen then
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64 session:open_stream();
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65 end
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66 if reason then -- nil == no err, initiated by us, false == initiated by client
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67 local stream_error = st.stanza("stream:error");
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68 if type(reason) == "string" then -- assume stream error
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69 stream_error:tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' });
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70 elseif type(reason) == "table" then
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71 if reason.condition then
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72 stream_error:tag(reason.condition, stream_xmlns_attr):up();
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73 if reason.text then
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74 stream_error:tag("text", stream_xmlns_attr):text(reason.text):up();
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75 end
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76 if reason.extra then
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77 stream_error:add_child(reason.extra);
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78 end
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79 elseif reason.name then -- a stanza
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80 stream_error = reason;
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81 end
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82 end
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83 log("debug", "Disconnecting client, <stream:error> is: %s", stream_error);
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84 session.send(stream_error);
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85 end
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86
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87 session.send(st.stanza("close", { xmlns = xmlns_framing }));
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88 function session.send() return false; end
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89
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90 -- luacheck: ignore 422/reason
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91 -- FIXME reason should be handled in common place
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92 local reason = (reason and (reason.name or reason.text or reason.condition)) or reason;
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93 session.log("debug", "c2s stream for %s closed: %s", session.full_jid or ("<"..session.ip..">"), reason or "session closed");
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94
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95 -- Authenticated incoming stream may still be sending us stanzas, so wait for </stream:stream> from remote
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96 local conn = session.conn;
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97 if reason == nil and not session.notopen and session.type == "c2s" then
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98 -- Grace time to process data from authenticated cleanly-closed stream
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99 add_task(stream_close_timeout, function ()
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100 if not session.destroyed then
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101 session.log("warn", "Failed to receive a stream close response, closing connection anyway...");
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102 sm_destroy_session(session, reason);
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103 conn:write(build_close(1000, "Stream closed"));
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104 conn:close();
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105 end
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106 end);
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107 else
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108 sm_destroy_session(session, reason);
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109 conn:write(build_close(1000, "Stream closed"));
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110 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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116 --- Filters
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117 local function filter_open_close(data)
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118 if not data:find(xmlns_framing, 1, true) then return data; end
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119
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120 local oc = parse_xml(data);
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121 if not oc then return data; end
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122 if oc.attr.xmlns ~= xmlns_framing then return data; end
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123 if oc.name == "close" then return "</stream:stream>"; end
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124 if oc.name == "open" then
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125 oc.name = "stream:stream";
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126 oc.attr.xmlns = nil;
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127 oc.attr["xmlns:stream"] = xmlns_streams;
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128 return oc:top_tag();
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129 end
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130
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131 return data;
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132 end
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133
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134 local default_get_response_body = [[<!DOCTYPE html><html><head><title>Websocket</title></head><body>
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135 <p>It works! Now point your WebSocket client to this URL to connect to Prosody.</p>
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136 </body></html>]]
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137 local websocket_get_response_body = module:get_option_string("websocket_get_response_body", default_get_response_body)
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138
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139 function handle_request(event)
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140 local request, response = event.request, event.response;
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141 local conn = response.conn;
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142
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143 conn.starttls = false; -- Prevent mod_tls from believing starttls can be done
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144
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145 if not request.headers.sec_websocket_key or request.method ~= "GET" then
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146 response.headers.content_type = "text/html";
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147 return websocket_get_response_body;
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148 end
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149
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150 local wants_xmpp = contains_token(request.headers.sec_websocket_protocol or "", "xmpp");
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151
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152 if not wants_xmpp then
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153 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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154 return 501;
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155 end
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156
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157 local function websocket_close(code, message)
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158 conn:write(build_close(code, message));
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159 conn:close();
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160 end
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161
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162 local dataBuffer;
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163 local function handle_frame(frame)
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164 local opcode = frame.opcode;
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165 local length = frame.length;
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166 module:log("debug", "Websocket received frame: opcode=%0x, %i bytes", frame.opcode, #frame.data);
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167
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168 -- Error cases
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169 if frame.RSV1 or frame.RSV2 or frame.RSV3 then -- Reserved bits non zero
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170 websocket_close(1002, "Reserved bits not zero");
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171 return false;
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172 end
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173
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174 if opcode == 0x8 then -- close frame
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175 if length == 1 then
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176 websocket_close(1002, "Close frame with payload, but too short for status code");
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177 return false;
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178 elseif length >= 2 then
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179 local status_code = parse_close(frame.data)
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180 if status_code < 1000 then
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181 websocket_close(1002, "Closed with invalid status code");
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182 return false;
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183 elseif ((status_code > 1003 and status_code < 1007) or status_code > 1011) and status_code < 3000 then
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184 websocket_close(1002, "Closed with reserved status code");
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185 return false;
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186 end
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187 end
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188 end
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189
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190 if opcode >= 0x8 then
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191 if length > 125 then -- Control frame with too much payload
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192 websocket_close(1002, "Payload too large");
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193 return false;
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194 end
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195
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196 if not frame.FIN then -- Fragmented control frame
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197 websocket_close(1002, "Fragmented control frame");
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198 return false;
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199 end
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200 end
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201
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202 if (opcode > 0x2 and opcode < 0x8) or (opcode > 0xA) then
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203 websocket_close(1002, "Reserved opcode");
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204 return false;
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205 end
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206
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207 if opcode == 0x0 and not dataBuffer then
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208 websocket_close(1002, "Unexpected continuation frame");
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209 return false;
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210 end
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211
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212 if (opcode == 0x1 or opcode == 0x2) and dataBuffer then
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213 websocket_close(1002, "Continuation frame expected");
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214 return false;
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215 end
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216
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217 -- Valid cases
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218 if opcode == 0x0 then -- Continuation frame
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219 dataBuffer[#dataBuffer+1] = frame.data;
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220 elseif opcode == 0x1 then -- Text frame
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221 dataBuffer = {frame.data};
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222 elseif opcode == 0x2 then -- Binary frame
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223 websocket_close(1003, "Only text frames are supported");
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224 return;
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225 elseif opcode == 0x8 then -- Close request
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226 websocket_close(1000, "Goodbye");
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227 return;
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228 elseif opcode == 0x9 then -- Ping frame
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229 frame.opcode = 0xA;
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230 frame.MASK = false; -- Clients send masked frames, servers don't, see #1484
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231 conn:write(build_frame(frame));
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232 return "";
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233 elseif opcode == 0xA then -- Pong frame, MAY be sent unsolicited, eg as keepalive
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234 return "";
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235 else
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236 log("warn", "Received frame with unsupported opcode %i", opcode);
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237 return "";
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238 end
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239
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240 if frame.FIN then
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241 local data = t_concat(dataBuffer, "");
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242 dataBuffer = nil;
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243 return data;
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244 end
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245 return "";
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246 end
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247
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248 conn:setlistener(c2s_listener);
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249 c2s_listener.onconnect(conn);
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250
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251 local session = sessions[conn];
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252
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253 -- Use upstream IP if a HTTP proxy was used
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254 -- See mod_http and #540
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255 session.ip = request.ip;
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256
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257 session.secure = consider_websocket_secure or session.secure;
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258 session.websocket_request = request;
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259
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260 session.open_stream = session_open_stream;
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261 session.close = session_close;
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262
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263 local frameBuffer = "";
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264 add_filter(session, "bytes/in", function(data)
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265 local cache = {};
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266 frameBuffer = frameBuffer .. data;
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267 local frame, length = parse_frame(frameBuffer);
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268
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269 while frame do
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270 frameBuffer = frameBuffer:sub(length + 1);
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271 local result = handle_frame(frame);
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272 if not result then return; end
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273 cache[#cache+1] = filter_open_close(result);
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274 frame, length = parse_frame(frameBuffer);
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275 end
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276 return t_concat(cache, "");
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277 end);
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278
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279 add_filter(session, "stanzas/out", function(stanza)
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280 stanza = st.clone(stanza);
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281 local attr = stanza.attr;
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282 attr.xmlns = attr.xmlns or xmlns_client;
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283 if stanza.name:find("^stream:") then
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284 attr["xmlns:stream"] = attr["xmlns:stream"] or xmlns_streams;
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285 end
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286 return stanza;
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287 end, -1000);
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288
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289 add_filter(session, "bytes/out", function(data)
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290 return build_frame({ FIN = true, opcode = 0x01, data = tostring(data)});
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291 end);
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292
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293 response.status_code = 101;
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294 response.headers.upgrade = "websocket";
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295 response.headers.connection = "Upgrade";
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296 response.headers.sec_webSocket_accept = base64(sha1(request.headers.sec_websocket_key .. "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"));
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297 response.headers.sec_webSocket_protocol = "xmpp";
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298
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299 module:fire_event("websocket-session", { session = session, request = request });
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300
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301 session.log("debug", "Sending WebSocket handshake");
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302
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303 return "";
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304 end
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305
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306 local function keepalive(event)
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307 local session = event.session;
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308 if session.open_stream == session_open_stream then
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309 return session.conn:write(build_frame({ opcode = 0x9, FIN = true }));
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310 end
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311 end
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312
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313 module:hook("c2s-read-timeout", keepalive, -0.9);
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314
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315 module:depends("http");
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316 module:provides("http", {
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317 name = "websocket";
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318 default_path = "xmpp-websocket";
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319 route = {
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320 ["GET"] = handle_request;
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321 ["GET /"] = handle_request;
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322 };
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323 });
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324
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325 function module.add_host(module)
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326 module:hook("c2s-read-timeout", keepalive, -0.9);
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327 end