prosody
7e9ebdc75ce4
plugins/mod_websocket.lua

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plugins/mod_websocket.lua @ 12480:7e9ebdc75ce4

net: isolate LuaSec-specifics For this, various accessor functions are now provided directly on the sockets, which reach down into the LuaSec implementation to obtain the information. While this may seem of little gain at first, it hides the implementation detail of the LuaSec+LuaSocket combination that the actual socket and the TLS layer are separate objects. The net gain here is that an alternative implementation does not have to emulate that specific implementation detail and "only" has to expose LuaSec-compatible data structures on the new functions.
author Jonas Schäfer <jonas@wielicki.name>
date Wed, 27 Apr 2022 17:44:14 +0200
parent 12444:b33558969b3e
child 12894:0598d822614f
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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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 cors = {
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359 enabled = true;
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360 };
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361 route = {
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362 ["GET"] = handle_request;
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363 ["GET /"] = handle_request;
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364 };
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365 });
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366
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367 module:hook("c2s-read-timeout", keepalive, -0.9);
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368 end
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369
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diff changeset
370 if require"core.modulemanager".get_modules_for_host("*"):contains(module.name) then
168970ce8543 mod_websocket: Only enable host-agnostic HTTP routing when enabled globally
Kim Alvefur <zash@zash.se>
parents: 11868
diff changeset
371 module:add_host();
168970ce8543 mod_websocket: Only enable host-agnostic HTTP routing when enabled globally
Kim Alvefur <zash@zash.se>
parents: 11868
diff changeset
372 end