prosody
7ec7dba7ba8b
plugins/mod_websocket.lua

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plugins/mod_websocket.lua @ 11109:7ec7dba7ba8b 0.11

mod_websocket: Add separate limit for frame buffer size
author Matthew Wild <mwild1@gmail.com>
date Thu, 17 Sep 2020 16:42:14 +0100
parent 11108:fa1821b56f75
child 11110:67fb92e312f1
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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e0e1f6d6fb4f mod_websocket: Use contains_token from util.http for checking if the requested WebSocket sub-protocols include XMPP
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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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ddd0007e0f1b mod_websocket: Switch partial frame buffering to util.dbuffer
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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 frameBuffer:discard(length);
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289 local result = handle_frame(frame);
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290 if not result then return; end
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291 cache[#cache+1] = filter_open_close(result);
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292 frame, length = parse_frame(frameBuffer);
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293 end
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294 return t_concat(cache, "");
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295 end);
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296
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297 add_filter(session, "stanzas/out", function(stanza)
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298 stanza = st.clone(stanza);
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299 local attr = stanza.attr;
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300 attr.xmlns = attr.xmlns or xmlns_client;
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301 if stanza.name:find("^stream:") then
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302 attr["xmlns:stream"] = attr["xmlns:stream"] or xmlns_streams;
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303 end
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304 return stanza;
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305 end, -1000);
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306
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307 add_filter(session, "bytes/out", function(data)
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308 return build_frame({ FIN = true, opcode = 0x01, data = tostring(data)});
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309 end);
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310
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311 response.status_code = 101;
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312 response.headers.upgrade = "websocket";
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313 response.headers.connection = "Upgrade";
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314 response.headers.sec_webSocket_accept = base64(sha1(request.headers.sec_websocket_key .. "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"));
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315 response.headers.sec_webSocket_protocol = "xmpp";
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316
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317 module:fire_event("websocket-session", { session = session, request = request });
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318
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319 session.log("debug", "Sending WebSocket handshake");
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320
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321 return "";
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322 end
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323
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324 local function keepalive(event)
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325 local session = event.session;
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326 if session.open_stream == session_open_stream then
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327 return session.conn:write(build_frame({ opcode = 0x9, FIN = true }));
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328 end
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329 end
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330
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331 module:hook("c2s-read-timeout", keepalive, -0.9);
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332
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333 module:depends("http");
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334 module:provides("http", {
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335 name = "websocket";
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336 default_path = "xmpp-websocket";
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337 route = {
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338 ["GET"] = handle_request;
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339 ["GET /"] = handle_request;
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340 };
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341 });
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342
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343 function module.add_host(module)
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344 module:hook("c2s-read-timeout", keepalive, -0.9);
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parents: 7762
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345
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346 if cross_domain ~= true then
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347 local url = require "socket.url";
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348 local ws_url = module:http_url("websocket", "xmpp-websocket");
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349 local url_components = url.parse(ws_url);
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350 -- The 'Origin' consists of the base URL without path
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351 url_components.path = nil;
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352 local this_origin = url.build(url_components);
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353 local local_cross_domain = module:get_option_set("cross_domain_websocket", { this_origin });
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parents: 9800
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354 if local_cross_domain:contains(true) then
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355 module:log("error", "cross_domain_websocket = true only works in the global section");
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356 return;
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357 end
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358
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359 -- Don't add / remove something added by another host
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360 -- This might be weird with random load order
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361 local_cross_domain:exclude(cross_domain);
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362 cross_domain:include(local_cross_domain);
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363 module:log("debug", "cross_domain = %s", tostring(cross_domain));
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364 function module.unload()
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365 cross_domain:exclude(local_cross_domain);
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366 end
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367 end
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368 end