prosody
55d8612ac357
plugins/mod_websocket.lua

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plugins/mod_websocket.lua @ 11111:55d8612ac357 0.11

mod_websocket: Continue to process data already in the buffer after an error occurs Previously any error, or even a normal websocket close frame, would return early, leaving potentially entire frames in the buffer unprocessed and then discarded. This change stops processing new data, but returns an existing processed data up to the point of the error/close.
author Matthew Wild <mwild1@gmail.com>
date Mon, 28 Sep 2020 16:36:12 +0100
parent 11110:67fb92e312f1
child 11113:10301c214f4e
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 local dbuffer = require "util.dbuffer";
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22
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23 local websocket_frames = require"net.websocket.frames";
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24 local parse_frame = websocket_frames.parse;
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25 local build_frame = websocket_frames.build;
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26 local build_close = websocket_frames.build_close;
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27 local parse_close = websocket_frames.parse_close;
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28
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29 local t_concat = table.concat;
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30
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31 local stanza_size_limit = module:get_option_number("c2s_stanza_size_limit", 10 * 1024 * 1024);
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32 local frame_buffer_limit = module:get_option_number("websocket_frame_buffer_limit", 2 * stanza_size_limit);
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33 local frame_fragment_limit = module:get_option_number("websocket_frame_fragment_limit", 8);
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34 local stream_close_timeout = module:get_option_number("c2s_close_timeout", 5);
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35 local consider_websocket_secure = module:get_option_boolean("consider_websocket_secure");
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36 local cross_domain = module:get_option_set("cross_domain_websocket", {});
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37 if cross_domain:contains("*") or cross_domain:contains(true) then
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38 cross_domain = true;
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39 end
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40
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41 local function check_origin(origin)
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42 if cross_domain == true then
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43 return true;
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44 end
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45 return cross_domain:contains(origin);
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46 end
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47
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48 local xmlns_framing = "urn:ietf:params:xml:ns:xmpp-framing";
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49 local xmlns_streams = "http://etherx.jabber.org/streams";
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50 local xmlns_client = "jabber:client";
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51 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
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52
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53 module:depends("c2s")
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54 local sessions = module:shared("c2s/sessions");
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55 local c2s_listener = portmanager.get_service("c2s").listener;
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56
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57 --- Session methods
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58 local function session_open_stream(session, from, to)
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59 local attr = {
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60 xmlns = xmlns_framing,
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61 ["xml:lang"] = "en",
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62 version = "1.0",
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63 id = session.streamid or "",
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64 from = from or session.host, to = to,
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65 };
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66 if session.stream_attrs then
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67 session:stream_attrs(from, to, attr)
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68 end
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69 session.send(st.stanza("open", attr));
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70 end
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71
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72 local function session_close(session, reason)
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73 local log = session.log or log;
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74 if session.conn then
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75 if session.notopen then
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76 session:open_stream();
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77 end
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78 if reason then -- nil == no err, initiated by us, false == initiated by client
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79 local stream_error = st.stanza("stream:error");
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80 if type(reason) == "string" then -- assume stream error
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81 stream_error:tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' });
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82 elseif type(reason) == "table" then
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83 if reason.condition then
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84 stream_error:tag(reason.condition, stream_xmlns_attr):up();
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85 if reason.text then
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86 stream_error:tag("text", stream_xmlns_attr):text(reason.text):up();
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87 end
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88 if reason.extra then
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89 stream_error:add_child(reason.extra);
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90 end
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91 elseif reason.name then -- a stanza
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92 stream_error = reason;
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93 end
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94 end
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95 log("debug", "Disconnecting client, <stream:error> is: %s", tostring(stream_error));
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96 session.send(stream_error);
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97 end
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98
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99 session.send(st.stanza("close", { xmlns = xmlns_framing }));
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100 function session.send() return false; end
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101
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102 -- luacheck: ignore 422/reason
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103 -- FIXME reason should be handled in common place
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104 local reason = (reason and (reason.name or reason.text or reason.condition)) or reason;
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105 session.log("debug", "c2s stream for %s closed: %s", session.full_jid or ("<"..session.ip..">"), reason or "session closed");
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106
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107 -- Authenticated incoming stream may still be sending us stanzas, so wait for </stream:stream> from remote
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108 local conn = session.conn;
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109 if reason == nil and not session.notopen and session.type == "c2s" then
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110 -- Grace time to process data from authenticated cleanly-closed stream
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111 add_task(stream_close_timeout, function ()
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112 if not session.destroyed then
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113 session.log("warn", "Failed to receive a stream close response, closing connection anyway...");
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114 sm_destroy_session(session, reason);
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115 conn:write(build_close(1000, "Stream closed"));
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116 conn:close();
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117 end
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118 end);
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119 else
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120 sm_destroy_session(session, reason);
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121 conn:write(build_close(1000, "Stream closed"));
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122 conn:close();
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123 end
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124 end
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125 end
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126
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127
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128 --- Filters
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129 local function filter_open_close(data)
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130 if not data:find(xmlns_framing, 1, true) then return data; end
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131
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132 local oc = parse_xml(data);
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133 if not oc then return data; end
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134 if oc.attr.xmlns ~= xmlns_framing then return data; end
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135 if oc.name == "close" then return "</stream:stream>"; end
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136 if oc.name == "open" then
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137 oc.name = "stream:stream";
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138 oc.attr.xmlns = nil;
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139 oc.attr["xmlns:stream"] = xmlns_streams;
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140 return oc:top_tag();
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141 end
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142
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143 return data;
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144 end
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145 function handle_request(event)
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146 local request, response = event.request, event.response;
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147 local conn = response.conn;
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148
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149 conn.starttls = false; -- Prevent mod_tls from believing starttls can be done
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150
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151 if not request.headers.sec_websocket_key then
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152 response.headers.content_type = "text/html";
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153 return [[<!DOCTYPE html><html><head><title>Websocket</title></head><body>
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154 <p>It works! Now point your WebSocket client to this URL to connect to Prosody.</p>
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155 </body></html>]];
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156 end
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157
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158 local wants_xmpp = contains_token(request.headers.sec_websocket_protocol or "", "xmpp");
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159
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160 if not wants_xmpp then
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161 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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162 return 501;
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163 end
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164
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165 if not check_origin(request.headers.origin or "") then
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166 module:log("debug", "Origin %s is not allowed by 'cross_domain_websocket' [ %s ]", request.headers.origin or "(missing header)", cross_domain);
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167 return 403;
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168 end
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169
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170 local function websocket_close(code, message)
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171 conn:write(build_close(code, message));
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172 conn:close();
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173 end
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174
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175 local dataBuffer;
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176 local function handle_frame(frame)
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177 local opcode = frame.opcode;
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178 local length = frame.length;
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179 module:log("debug", "Websocket received frame: opcode=%0x, %i bytes", frame.opcode, #frame.data);
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180
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181 -- Error cases
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182 if frame.RSV1 or frame.RSV2 or frame.RSV3 then -- Reserved bits non zero
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183 websocket_close(1002, "Reserved bits not zero");
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184 return false;
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185 end
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186
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187 if opcode == 0x8 then -- close frame
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188 if length == 1 then
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189 websocket_close(1002, "Close frame with payload, but too short for status code");
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190 return false;
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191 elseif length >= 2 then
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192 local status_code = parse_close(frame.data)
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193 if status_code < 1000 then
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194 websocket_close(1002, "Closed with invalid status code");
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195 return false;
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196 elseif ((status_code > 1003 and status_code < 1007) or status_code > 1011) and status_code < 3000 then
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197 websocket_close(1002, "Closed with reserved status code");
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198 return false;
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199 end
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200 end
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201 end
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202
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203 if opcode >= 0x8 then
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204 if length > 125 then -- Control frame with too much payload
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205 websocket_close(1002, "Payload too large");
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206 return false;
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207 end
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208
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209 if not frame.FIN then -- Fragmented control frame
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210 websocket_close(1002, "Fragmented control frame");
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211 return false;
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212 end
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213 end
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214
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215 if (opcode > 0x2 and opcode < 0x8) or (opcode > 0xA) then
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216 websocket_close(1002, "Reserved opcode");
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217 return false;
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218 end
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219
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220 if opcode == 0x0 and not dataBuffer then
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221 websocket_close(1002, "Unexpected continuation frame");
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222 return false;
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223 end
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224
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225 if (opcode == 0x1 or opcode == 0x2) and dataBuffer then
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226 websocket_close(1002, "Continuation frame expected");
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227 return false;
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228 end
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229
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230 -- Valid cases
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231 if opcode == 0x0 then -- Continuation frame
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232 dataBuffer[#dataBuffer+1] = frame.data;
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233 elseif opcode == 0x1 then -- Text frame
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234 dataBuffer = {frame.data};
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235 elseif opcode == 0x2 then -- Binary frame
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236 websocket_close(1003, "Only text frames are supported");
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237 return;
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238 elseif opcode == 0x8 then -- Close request
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239 websocket_close(1000, "Goodbye");
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240 return;
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241 elseif opcode == 0x9 then -- Ping frame
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242 frame.opcode = 0xA;
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243 frame.MASK = false; -- Clients send masked frames, servers don't, see #1484
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244 conn:write(build_frame(frame));
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245 return "";
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246 elseif opcode == 0xA then -- Pong frame, MAY be sent unsolicited, eg as keepalive
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247 return "";
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248 else
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249 log("warn", "Received frame with unsupported opcode %i", opcode);
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250 return "";
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251 end
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252
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253 if frame.FIN then
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254 local data = t_concat(dataBuffer, "");
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255 dataBuffer = nil;
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256 return data;
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257 end
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258 return "";
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259 end
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260
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261 conn:setlistener(c2s_listener);
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262 c2s_listener.onconnect(conn);
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263
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264 local session = sessions[conn];
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265
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266 -- Use upstream IP if a HTTP proxy was used
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267 -- See mod_http and #540
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268 session.ip = request.ip;
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269
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270 session.secure = consider_websocket_secure or session.secure;
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271 session.websocket_request = request;
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272
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273 session.open_stream = session_open_stream;
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274 session.close = session_close;
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275
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276 local frameBuffer = dbuffer.new(frame_buffer_limit, frame_fragment_limit);
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277 add_filter(session, "bytes/in", function(data)
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278 if not frameBuffer:write(data) then
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279 session.log("warn", "websocket frame buffer full - terminating session");
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280 session:close({ condition = "resource-constraint", text = "frame buffer exceeded" });
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281 return;
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282 end
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283
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284 local cache = {};
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285 local frame, length = parse_frame(frameBuffer);
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286
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287 while frame do
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288 if length > stanza_size_limit then
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289 session:close({ condition = "policy-violation", text = "stanza too large" });
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290 return;
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291 end
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292 frameBuffer:discard(length);
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293 local result = handle_frame(frame);
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294 if not result then break; end
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295 cache[#cache+1] = filter_open_close(result);
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296 frame, length = parse_frame(frameBuffer);
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297 end
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298 return t_concat(cache, "");
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299 end);
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300
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301 add_filter(session, "stanzas/out", function(stanza)
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302 stanza = st.clone(stanza);
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303 local attr = stanza.attr;
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304 attr.xmlns = attr.xmlns or xmlns_client;
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305 if stanza.name:find("^stream:") then
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306 attr["xmlns:stream"] = attr["xmlns:stream"] or xmlns_streams;
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307 end
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308 return stanza;
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309 end, -1000);
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310
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311 add_filter(session, "bytes/out", function(data)
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312 return build_frame({ FIN = true, opcode = 0x01, data = tostring(data)});
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313 end);
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314
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315 response.status_code = 101;
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316 response.headers.upgrade = "websocket";
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317 response.headers.connection = "Upgrade";
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318 response.headers.sec_webSocket_accept = base64(sha1(request.headers.sec_websocket_key .. "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"));
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319 response.headers.sec_webSocket_protocol = "xmpp";
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320
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321 module:fire_event("websocket-session", { session = session, request = request });
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322
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323 session.log("debug", "Sending WebSocket handshake");
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324
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325 return "";
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326 end
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327
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328 local function keepalive(event)
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329 local session = event.session;
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330 if session.open_stream == session_open_stream then
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331 return session.conn:write(build_frame({ opcode = 0x9, FIN = true }));
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332 end
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333 end
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334
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335 module:hook("c2s-read-timeout", keepalive, -0.9);
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336
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337 module:depends("http");
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338 module:provides("http", {
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339 name = "websocket";
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340 default_path = "xmpp-websocket";
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341 route = {
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342 ["GET"] = handle_request;
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343 ["GET /"] = handle_request;
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344 };
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345 });
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346
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347 function module.add_host(module)
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348 module:hook("c2s-read-timeout", keepalive, -0.9);
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349
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350 if cross_domain ~= true then
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351 local url = require "socket.url";
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352 local ws_url = module:http_url("websocket", "xmpp-websocket");
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353 local url_components = url.parse(ws_url);
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354 -- The 'Origin' consists of the base URL without path
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355 url_components.path = nil;
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356 local this_origin = url.build(url_components);
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357 local local_cross_domain = module:get_option_set("cross_domain_websocket", { this_origin });
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358 if local_cross_domain:contains(true) then
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359 module:log("error", "cross_domain_websocket = true only works in the global section");
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360 return;
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361 end
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362
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363 -- Don't add / remove something added by another host
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364 -- This might be weird with random load order
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365 local_cross_domain:exclude(cross_domain);
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366 cross_domain:include(local_cross_domain);
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367 module:log("debug", "cross_domain = %s", tostring(cross_domain));
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368 function module.unload()
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369 cross_domain:exclude(local_cross_domain);
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370 end
c5ce14539fc4 mod_websocket: Add the base URL of each host module is enabled on to 'cross_domain_websocket'
Kim Alvefur <zash@zash.se>
parents: 7762
diff changeset
371 end
6397
6f75f8043936 mod_websocket: Initial commit (based on the prosody-modules version)
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
372 end