prosody
ae093c259da2
plugins/mod_websocket.lua

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plugins/mod_websocket.lua @ 11868:ae093c259da2

mod_c2s,etc: Identify stanza object with appropriate function Better than duck typing, in case anyone ever passes a non-stanza table with a 'name' field.
author Kim Alvefur <zash@zash.se>
date Sun, 24 Oct 2021 15:17:01 +0200
parent 11771:4c0802b52673
child 12263:168970ce8543
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", 1024 * 256);
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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("cross_domain_websocket");
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37 if cross_domain ~= nil then
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38 module:log("info", "The 'cross_domain_websocket' option has been deprecated");
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39 end
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40 local xmlns_framing = "urn:ietf:params:xml:ns:xmpp-framing";
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41 local xmlns_streams = "http://etherx.jabber.org/streams";
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42 local xmlns_client = "jabber:client";
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43 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
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44
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45 module:depends("c2s")
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46 local sessions = module:shared("c2s/sessions");
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47 local c2s_listener = portmanager.get_service("c2s").listener;
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48
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49 --- Session methods
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50 local function session_open_stream(session, from, to)
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51 local attr = {
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52 xmlns = xmlns_framing,
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53 ["xml:lang"] = "en",
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54 version = "1.0",
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55 id = session.streamid or "",
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56 from = from or session.host, to = to,
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57 };
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58 if session.stream_attrs then
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59 session:stream_attrs(from, to, attr)
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60 end
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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 st.is_stanza(reason) then
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75 stream_error = reason;
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76 elseif type(reason) == "table" then
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77 if reason.condition then
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78 stream_error:tag(reason.condition, stream_xmlns_attr):up();
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79 if reason.text then
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80 stream_error:tag("text", stream_xmlns_attr):text(reason.text):up();
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81 end
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82 if reason.extra then
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83 stream_error:add_child(reason.extra);
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84 end
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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", 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 -- luacheck: ignore 422/reason
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95 -- FIXME reason should be handled in common place
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96 local reason = (reason and (reason.name or reason.text or reason.condition)) or reason;
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97 session.log("debug", "c2s stream for %s closed: %s", session.full_jid or ("<"..session.ip..">"), reason or "session closed");
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98
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99 -- Authenticated incoming stream may still be sending us stanzas, so wait for </stream:stream> from remote
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100 local conn = session.conn;
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101 if reason == nil and not session.notopen and session.type == "c2s" then
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102 -- Grace time to process data from authenticated cleanly-closed stream
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103 add_task(stream_close_timeout, function ()
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104 if not session.destroyed then
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105 session.log("warn", "Failed to receive a stream close response, closing connection anyway...");
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106 sm_destroy_session(session, reason);
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107 conn:write(build_close(1000, "Stream closed"));
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108 conn:close();
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109 end
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110 end);
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111 else
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112 sm_destroy_session(session, reason);
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113 conn:write(build_close(1000, "Stream closed"));
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114 conn:close();
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115 end
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116 end
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117 end
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118
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119
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120 --- Filters
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121 local function filter_open_close(data)
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122 if not data:find(xmlns_framing, 1, true) then return data; end
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123
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124 local oc = parse_xml(data);
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125 if not oc then return data; end
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126 if oc.attr.xmlns ~= xmlns_framing then return data; end
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127 if oc.name == "close" then return "</stream:stream>"; end
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128 if oc.name == "open" then
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129 oc.name = "stream:stream";
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130 oc.attr.xmlns = nil;
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131 oc.attr["xmlns:stream"] = xmlns_streams;
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132 return oc:top_tag();
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133 end
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134
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135 return data;
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136 end
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137
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138 local default_get_response_text = "It works! Now point your WebSocket client to this URL to connect to Prosody."
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139 local websocket_get_response_text = module:get_option_string("websocket_get_response_text", default_get_response_text)
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140
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141 local default_get_response_body = [[<!DOCTYPE html><html><head><title>Websocket</title></head><body>
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142 <p>]]..websocket_get_response_text..[[</p>
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143 </body></html>]]
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144 local websocket_get_response_body = module:get_option_string("websocket_get_response_body", default_get_response_body)
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145
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146 local function validate_frame(frame, max_length)
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147 local opcode, length = frame.opcode, frame.length;
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148
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149 if max_length and length > max_length then
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150 return false, 1009, "Payload too large";
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151 end
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152
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153 -- Error cases
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154 if frame.RSV1 or frame.RSV2 or frame.RSV3 then -- Reserved bits non zero
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155 return false, 1002, "Reserved bits not zero";
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156 end
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157
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158 if opcode == 0x8 and frame.data then -- close frame
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159 if length == 1 then
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160 return false, 1002, "Close frame with payload, but too short for status code";
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161 elseif length >= 2 then
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162 local status_code = parse_close(frame.data)
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163 if status_code < 1000 then
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164 return false, 1002, "Closed with invalid status code";
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165 elseif ((status_code > 1003 and status_code < 1007) or status_code > 1011) and status_code < 3000 then
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166 return false, 1002, "Closed with reserved status code";
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167 end
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168 end
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169 end
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170
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171 if opcode >= 0x8 then
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172 if length > 125 then -- Control frame with too much payload
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173 return false, 1002, "Payload too large";
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174 end
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175
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176 if not frame.FIN then -- Fragmented control frame
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177 return false, 1002, "Fragmented control frame";
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178 end
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179 end
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180
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181 if (opcode > 0x2 and opcode < 0x8) or (opcode > 0xA) then
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182 return false, 1002, "Reserved opcode";
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183 end
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184
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185 -- Check opcode
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186 if opcode == 0x2 then -- Binary frame
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187 return false, 1003, "Only text frames are supported, RFC 7395 3.2";
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188 elseif opcode == 0x8 then -- Close request
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189 return false, 1000, "Goodbye";
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190 end
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191
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192 -- Other (XMPP-specific) validity checks
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193 if not frame.FIN then
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194 return false, 1003, "Continuation frames are not supported, RFC 7395 3.3.3";
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195 end
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196 if opcode == 0x01 and frame.data and frame.data:byte(1, 1) ~= 60 then
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197 return false, 1007, "Invalid payload start character, RFC 7395 3.3.3";
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198 end
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199
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200 return true;
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201 end
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202
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203
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204 function handle_request(event)
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205 local request, response = event.request, event.response;
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206 local conn = response.conn;
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207
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208 conn.starttls = false; -- Prevent mod_tls from believing starttls can be done
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209
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210 if not request.headers.sec_websocket_key or request.method ~= "GET" then
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211 return module:fire_event("http-message", {
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212 response = event.response;
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213 ---
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214 title = "Prosody WebSocket endpoint";
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215 message = websocket_get_response_text;
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216 warning = not (consider_websocket_secure or request.secure) and "This endpoint is not considered secure!" or nil;
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217 }) or websocket_get_response_body;
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218 end
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219
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220 local wants_xmpp = contains_token(request.headers.sec_websocket_protocol or "", "xmpp");
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221
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222 if not wants_xmpp then
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223 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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224 return 501;
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225 end
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226
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227 local function websocket_close(code, message)
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228 conn:write(build_close(code, message));
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229 conn:close();
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230 end
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231
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232 local function websocket_handle_error(session, code, message)
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233 if code == 1009 then -- stanza size limit exceeded
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234 -- we close the session, rather than the connection,
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235 -- otherwise a resuming client will simply resend the
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236 -- offending stanza
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237 session:close({ condition = "policy-violation", text = "stanza too large" });
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238 else
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239 websocket_close(code, message);
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240 end
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241 end
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242
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243 local function handle_frame(frame)
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244 module:log("debug", "Websocket received frame: opcode=%0x, %i bytes", frame.opcode, #frame.data);
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245
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246 -- Check frame makes sense
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247 local frame_ok, err_status, err_text = validate_frame(frame, stanza_size_limit);
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248 if not frame_ok then
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249 return frame_ok, err_status, err_text;
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250 end
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251
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252 local opcode = frame.opcode;
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253 if opcode == 0x9 then -- Ping frame
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254 frame.opcode = 0xA;
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255 frame.MASK = false; -- Clients send masked frames, servers don't, see #1484
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256 conn:write(build_frame(frame));
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257 return "";
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258 elseif opcode == 0xA then -- Pong frame, MAY be sent unsolicited, eg as keepalive
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259 return "";
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260 elseif opcode ~= 0x1 then -- Not text frame (which is all we support)
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261 log("warn", "Received frame with unsupported opcode %i", opcode);
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262 return "";
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263 end
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264
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265 return frame.data;
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266 end
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267
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268 conn:setlistener(c2s_listener);
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269 c2s_listener.onconnect(conn);
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270
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271 local session = sessions[conn];
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272
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273 -- Use upstream IP if a HTTP proxy was used
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274 -- See mod_http and #540
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275 session.ip = request.ip;
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276
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277 session.secure = consider_websocket_secure or request.secure or session.secure;
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278 session.websocket_request = request;
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279
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280 session.open_stream = session_open_stream;
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281 session.close = session_close;
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282
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283 local frameBuffer = dbuffer.new(frame_buffer_limit, frame_fragment_limit);
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284 add_filter(session, "bytes/in", function(data)
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285 if not frameBuffer:write(data) then
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286 session.log("warn", "websocket frame buffer full - terminating session");
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287 session:close({ condition = "resource-constraint", text = "frame buffer exceeded" });
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288 return;
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289 end
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290
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291 local cache = {};
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292 local frame, length, partial = parse_frame(frameBuffer);
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293
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294 while frame do
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295 frameBuffer:discard(length);
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296 local result, err_status, err_text = handle_frame(frame);
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297 if not result then
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298 websocket_handle_error(session, err_status, err_text);
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299 break;
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300 end
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301 cache[#cache+1] = filter_open_close(result);
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302 frame, length, partial = parse_frame(frameBuffer);
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303 end
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304
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305 if partial then
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306 -- The header of the next frame is already in the buffer, run
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307 -- some early validation here
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308 local frame_ok, err_status, err_text = validate_frame(partial, stanza_size_limit);
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309 if not frame_ok then
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310 websocket_handle_error(session, err_status, err_text);
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311 end
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312 end
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313
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314 return t_concat(cache, "");
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315 end);
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316
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317 add_filter(session, "stanzas/out", function(stanza)
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318 stanza = st.clone(stanza);
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319 local attr = stanza.attr;
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320 attr.xmlns = attr.xmlns or xmlns_client;
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321 if stanza.name:find("^stream:") then
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322 attr["xmlns:stream"] = attr["xmlns:stream"] or xmlns_streams;
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323 end
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324 return stanza;
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325 end, -1000);
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326
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327 add_filter(session, "bytes/out", function(data)
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328 return build_frame({ FIN = true, opcode = 0x01, data = tostring(data)});
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329 end);
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330
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331 response.status_code = 101;
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332 response.headers.upgrade = "websocket";
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333 response.headers.connection = "Upgrade";
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diff changeset
334 response.headers.sec_webSocket_accept = base64(sha1(request.headers.sec_websocket_key .. "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"));
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335 response.headers.sec_webSocket_protocol = "xmpp";
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336
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337 module:fire_event("websocket-session", { session = session, request = request });
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338
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339 session.log("debug", "Sending WebSocket handshake");
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340
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341 return "";
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342 end
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343
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344 local function keepalive(event)
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345 local session = event.session;
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346 if session.open_stream == session_open_stream then
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347 return session.conn:write(build_frame({ opcode = 0x9, FIN = true }));
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parents: 7315
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348 end
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349 end
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350
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351 function module.add_host(module)
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352 module:hook("c2s-read-timeout", keepalive, -0.9);
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353
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354 module:depends("http");
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355 module:provides("http", {
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356 name = "websocket";
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357 default_path = "xmpp-websocket";
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358 route = {
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359 ["GET"] = handle_request;
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360 ["GET /"] = handle_request;
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361 };
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362 });
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363
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364 module:hook("c2s-read-timeout", keepalive, -0.9);
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365 end
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366
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367 module:add_host();