prosody
46a7792fdac5
plugins/mod_websocket.lua

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plugins/mod_websocket.lua @ 10096:46a7792fdac5

util.poll: Add missing return statements in fallback mode These allowed modifying or deleting select() state for unregistered FDs. During normal usage this should never happen. Modifying one that isn't set might cause weirdness but deleting an already deleted FD isn't a problem.
author Kim Alvefur <zash@zash.se>
date Sun, 28 Jul 2019 16:17:23 +0200
parent 9806:b72d2f4153f7
child 10097:1f45d316b222
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", tostring(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 function handle_request(event)
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134 local request, response = event.request, event.response;
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135 local conn = response.conn;
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136
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137 conn.starttls = false; -- Prevent mod_tls from believing starttls can be done
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138
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139 if not request.headers.sec_websocket_key then
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140 response.headers.content_type = "text/html";
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141 return [[<!DOCTYPE html><html><head><title>Websocket</title></head><body>
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142 <p>It works! Now point your WebSocket client to this URL to connect to Prosody.</p>
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143 </body></html>]];
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144 end
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145
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146 local wants_xmpp = contains_token(request.headers.sec_websocket_protocol or "", "xmpp");
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147
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148 if not wants_xmpp then
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149 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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150 return 501;
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151 end
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152
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153 local function websocket_close(code, message)
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154 conn:write(build_close(code, message));
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155 conn:close();
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156 end
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157
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158 local dataBuffer;
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159 local function handle_frame(frame)
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160 local opcode = frame.opcode;
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161 local length = frame.length;
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162 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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165 if frame.RSV1 or frame.RSV2 or frame.RSV3 then -- Reserved bits non zero
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166 websocket_close(1002, "Reserved bits not zero");
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167 return false;
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168 end
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169
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170 if opcode == 0x8 then -- close frame
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171 if length == 1 then
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172 websocket_close(1002, "Close frame with payload, but too short for status code");
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173 return false;
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174 elseif length >= 2 then
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175 local status_code = parse_close(frame.data)
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176 if status_code < 1000 then
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177 websocket_close(1002, "Closed with invalid status code");
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178 return false;
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179 elseif ((status_code > 1003 and status_code < 1007) or status_code > 1011) and status_code < 3000 then
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180 websocket_close(1002, "Closed with reserved status code");
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181 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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186 if opcode >= 0x8 then
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187 if length > 125 then -- Control frame with too much payload
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188 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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192 if not frame.FIN then -- Fragmented control frame
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193 websocket_close(1002, "Fragmented control frame");
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194 return false;
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195 end
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196 end
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197
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198 if (opcode > 0x2 and opcode < 0x8) or (opcode > 0xA) then
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199 websocket_close(1002, "Reserved opcode");
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200 return false;
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201 end
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202
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203 if opcode == 0x0 and not dataBuffer then
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204 websocket_close(1002, "Unexpected continuation frame");
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205 return false;
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206 end
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207
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208 if (opcode == 0x1 or opcode == 0x2) and dataBuffer then
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209 websocket_close(1002, "Continuation frame expected");
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210 return false;
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211 end
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212
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213 -- Valid cases
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214 if opcode == 0x0 then -- Continuation frame
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215 dataBuffer[#dataBuffer+1] = frame.data;
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216 elseif opcode == 0x1 then -- Text frame
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217 dataBuffer = {frame.data};
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218 elseif opcode == 0x2 then -- Binary frame
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219 websocket_close(1003, "Only text frames are supported");
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220 return;
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221 elseif opcode == 0x8 then -- Close request
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222 websocket_close(1000, "Goodbye");
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223 return;
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224 elseif opcode == 0x9 then -- Ping frame
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225 frame.opcode = 0xA;
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226 conn:write(build_frame(frame));
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227 return "";
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228 elseif opcode == 0xA then -- Pong frame, MAY be sent unsolicited, eg as keepalive
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229 return "";
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230 else
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231 log("warn", "Received frame with unsupported opcode %i", opcode);
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232 return "";
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233 end
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234
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235 if frame.FIN then
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236 local data = t_concat(dataBuffer, "");
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237 dataBuffer = nil;
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238 return data;
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239 end
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240 return "";
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241 end
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242
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243 conn:setlistener(c2s_listener);
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244 c2s_listener.onconnect(conn);
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245
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246 local session = sessions[conn];
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247
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248 -- Use upstream IP if a HTTP proxy was used
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249 -- See mod_http and #540
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250 session.ip = request.ip;
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251
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252 session.secure = consider_websocket_secure or session.secure;
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253 session.websocket_request = request;
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254
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255 session.open_stream = session_open_stream;
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256 session.close = session_close;
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257
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258 local frameBuffer = "";
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259 add_filter(session, "bytes/in", function(data)
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260 local cache = {};
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261 frameBuffer = frameBuffer .. data;
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262 local frame, length = parse_frame(frameBuffer);
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263
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264 while frame do
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265 frameBuffer = frameBuffer:sub(length + 1);
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266 local result = handle_frame(frame);
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267 if not result then return; end
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268 cache[#cache+1] = filter_open_close(result);
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269 frame, length = parse_frame(frameBuffer);
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270 end
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271 return t_concat(cache, "");
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272 end);
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273
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274 add_filter(session, "stanzas/out", function(stanza)
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275 local attr = stanza.attr;
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276 attr.xmlns = attr.xmlns or xmlns_client;
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277 if stanza.name:find("^stream:") then
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278 attr["xmlns:stream"] = attr["xmlns:stream"] or xmlns_streams;
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279 end
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280 return stanza;
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281 end, -1000);
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282
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283 add_filter(session, "bytes/out", function(data)
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284 return build_frame({ FIN = true, opcode = 0x01, data = tostring(data)});
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285 end);
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286
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287 response.status_code = 101;
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288 response.headers.upgrade = "websocket";
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289 response.headers.connection = "Upgrade";
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290 response.headers.sec_webSocket_accept = base64(sha1(request.headers.sec_websocket_key .. "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"));
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291 response.headers.sec_webSocket_protocol = "xmpp";
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292
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293 session.log("debug", "Sending WebSocket handshake");
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294
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295 return "";
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296 end
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297
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298 local function keepalive(event)
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299 local session = event.session;
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300 if session.open_stream == session_open_stream then
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301 return session.conn:write(build_frame({ opcode = 0x9, FIN = true }));
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302 end
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303 end
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304
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305 module:hook("c2s-read-timeout", keepalive, -0.9);
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306
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307 module:depends("http");
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308 module:provides("http", {
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309 name = "websocket";
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310 default_path = "xmpp-websocket";
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311 route = {
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312 ["GET"] = handle_request;
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313 ["GET /"] = handle_request;
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314 };
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315 });
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316
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317 function module.add_host(module)
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318 module:hook("c2s-read-timeout", keepalive, -0.9);
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319 end