prosody
2208e6cd0d9f
plugins/mod_websocket.lua

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plugins/mod_websocket.lua @ 7762:2208e6cd0d9f

mod_websocket: Verify that the client-sent Origin header matches cross_domain_websocket (fixes #652)
author Kim Alvefur <zash@zash.se>
date Mon, 05 Dec 2016 12:22:41 +0100
parent 7761:e0e1f6d6fb4f
child 7763:c5ce14539fc4
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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_set("cross_domain_websocket", {});
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33 if cross_domain:contains("*") or cross_domain:contains(true) then
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34 cross_domain = true;
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35 end
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36
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37 local function check_origin(origin)
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38 if cross_domain == true then
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39 return true;
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40 end
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41 return cross_domain:contains(origin);
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42 end
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43
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44 local xmlns_framing = "urn:ietf:params:xml:ns:xmpp-framing";
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45 local xmlns_streams = "http://etherx.jabber.org/streams";
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46 local xmlns_client = "jabber:client";
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47 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
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48
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49 module:depends("c2s")
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50 local sessions = module:shared("c2s/sessions");
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51 local c2s_listener = portmanager.get_service("c2s").listener;
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52
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53 --- Session methods
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54 local function session_open_stream(session)
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55 local attr = {
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56 xmlns = xmlns_framing,
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57 version = "1.0",
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58 id = session.streamid or "",
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59 from = session.host
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60 };
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61 session.send(st.stanza("open", attr));
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62 end
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63
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64 local function session_close(session, reason)
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65 local log = session.log or log;
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66 if session.conn then
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67 if session.notopen then
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68 session:open_stream();
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69 end
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70 if reason then -- nil == no err, initiated by us, false == initiated by client
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71 local stream_error = st.stanza("stream:error");
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72 if type(reason) == "string" then -- assume stream error
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73 stream_error:tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' });
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74 elseif type(reason) == "table" then
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75 if reason.condition then
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76 stream_error:tag(reason.condition, stream_xmlns_attr):up();
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77 if reason.text then
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78 stream_error:tag("text", stream_xmlns_attr):text(reason.text):up();
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79 end
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80 if reason.extra then
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81 stream_error:add_child(reason.extra);
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82 end
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83 elseif reason.name then -- a stanza
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84 stream_error = reason;
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85 end
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86 end
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87 log("debug", "Disconnecting client, <stream:error> is: %s", tostring(stream_error));
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88 session.send(stream_error);
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89 end
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90
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91 session.send(st.stanza("close", { xmlns = xmlns_framing }));
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92 function session.send() return false; end
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93
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94 local reason = (reason and (reason.name or reason.text or reason.condition)) or reason;
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95 session.log("debug", "c2s stream for %s closed: %s", session.full_jid or ("<"..session.ip..">"), reason or "session closed");
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96
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97 -- Authenticated incoming stream may still be sending us stanzas, so wait for </stream:stream> from remote
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98 local conn = session.conn;
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99 if reason == nil and not session.notopen and session.type == "c2s" then
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100 -- Grace time to process data from authenticated cleanly-closed stream
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101 add_task(stream_close_timeout, function ()
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102 if not session.destroyed then
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103 session.log("warn", "Failed to receive a stream close response, closing connection anyway...");
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104 sm_destroy_session(session, reason);
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105 conn:write(build_close(1000, "Stream closed"));
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106 conn:close();
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107 end
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108 end);
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109 else
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110 sm_destroy_session(session, reason);
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111 conn:write(build_close(1000, "Stream closed"));
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112 conn:close();
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113 end
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114 end
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115 end
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116
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117
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118 --- Filters
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119 local function filter_open_close(data)
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120 if not data:find(xmlns_framing, 1, true) then return data; end
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121
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122 local oc = parse_xml(data);
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123 if not oc then return data; end
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124 if oc.attr.xmlns ~= xmlns_framing then return data; end
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125 if oc.name == "close" then return "</stream:stream>"; end
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126 if oc.name == "open" then
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127 oc.name = "stream:stream";
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128 oc.attr.xmlns = nil;
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129 oc.attr["xmlns:stream"] = xmlns_streams;
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130 return oc:top_tag();
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131 end
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132
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133 return data;
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134 end
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135 function handle_request(event)
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136 local request, response = event.request, event.response;
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137 local conn = response.conn;
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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 if not check_origin(request.headers.origin or "") then
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154 module:log("debug", "Origin %s is not allowed by 'cross_domain_websocket'", request.headers.origin or "(missing header)");
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155 return 403;
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156 end
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157
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158 local function websocket_close(code, message)
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159 conn:write(build_close(code, message));
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160 conn:close();
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161 end
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162
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163 local dataBuffer;
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164 local function handle_frame(frame)
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165 local opcode = frame.opcode;
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166 local length = frame.length;
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167 module:log("debug", "Websocket received frame: opcode=%0x, %i bytes", frame.opcode, #frame.data);
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168
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169 -- Error cases
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170 if frame.RSV1 or frame.RSV2 or frame.RSV3 then -- Reserved bits non zero
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171 websocket_close(1002, "Reserved bits not zero");
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172 return false;
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173 end
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174
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175 if opcode == 0x8 then -- close frame
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176 if length == 1 then
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177 websocket_close(1002, "Close frame with payload, but too short for status code");
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178 return false;
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179 elseif length >= 2 then
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180 local status_code = parse_close(frame.data)
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181 if status_code < 1000 then
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182 websocket_close(1002, "Closed with invalid status code");
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183 return false;
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184 elseif ((status_code > 1003 and status_code < 1007) or status_code > 1011) and status_code < 3000 then
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185 websocket_close(1002, "Closed with reserved status code");
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186 return false;
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187 end
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188 end
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189 end
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190
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191 if opcode >= 0x8 then
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192 if length > 125 then -- Control frame with too much payload
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193 websocket_close(1002, "Payload too large");
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194 return false;
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195 end
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196
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197 if not frame.FIN then -- Fragmented control frame
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198 websocket_close(1002, "Fragmented control frame");
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199 return false;
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200 end
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201 end
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202
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203 if (opcode > 0x2 and opcode < 0x8) or (opcode > 0xA) then
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204 websocket_close(1002, "Reserved opcode");
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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 == 0x0 and not dataBuffer then
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209 websocket_close(1002, "Unexpected continuation frame");
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210 return false;
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211 end
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212
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213 if (opcode == 0x1 or opcode == 0x2) and dataBuffer then
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214 websocket_close(1002, "Continuation frame expected");
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215 return false;
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216 end
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217
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218 -- Valid cases
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219 if opcode == 0x0 then -- Continuation frame
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220 dataBuffer[#dataBuffer+1] = frame.data;
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221 elseif opcode == 0x1 then -- Text frame
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222 dataBuffer = {frame.data};
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223 elseif opcode == 0x2 then -- Binary frame
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224 websocket_close(1003, "Only text frames are supported");
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225 return;
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226 elseif opcode == 0x8 then -- Close request
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227 websocket_close(1000, "Goodbye");
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228 return;
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229 elseif opcode == 0x9 then -- Ping frame
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230 frame.opcode = 0xA;
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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 session.secure = consider_websocket_secure or session.secure;
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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 function module.add_host(module)
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308 module:depends("http");
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309 module:provides("http", {
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310 name = "websocket";
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311 default_path = "xmpp-websocket";
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312 route = {
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313 ["GET"] = handle_request;
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314 ["GET /"] = handle_request;
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315 };
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316 });
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317 module:hook("c2s-read-timeout", keepalive, -0.9);
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318 end