annotate mod_websocket/mod_websocket.lua @ 252:8eae74a31acb

mod_seclabels: Prototype security labels plugin
author Matthew Wild <mwild1@gmail.com>
date Mon, 20 Sep 2010 21:10:49 +0100
parents 5fc00a3e47b5
children 54fa9d6d7809
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1 module.host = "*" -- Global module
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2
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3 local logger = require "util.logger";
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4 local log = logger.init("mod_websocket");
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5 local httpserver = require "net.httpserver";
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6 local lxp = require "lxp";
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7 local init_xmlhandlers = require "core.xmlhandlers";
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8 local st = require "util.stanza";
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9 local sm = require "core.sessionmanager";
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10
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11 local sessions = {};
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12 local default_headers = { };
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13
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14
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15 local stream_callbacks = { default_ns = "jabber:client",
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16 streamopened = sm.streamopened,
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17 streamclosed = sm.streamclosed,
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18 handlestanza = core_process_stanza };
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19 function stream_callbacks.error(session, error, data)
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20 if error == "no-stream" then
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21 session.log("debug", "Invalid opening stream header");
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22 session:close("invalid-namespace");
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23 elseif session.close then
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24 (session.log or log)("debug", "Client XML parse error: %s", tostring(error));
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25 session:close("xml-not-well-formed");
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26 end
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27 end
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28
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29
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30 local function session_reset_stream(session)
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31 local parser = lxp.new(init_xmlhandlers(session, stream_callbacks), "\1");
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32 session.parser = parser;
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33
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34 session.notopen = true;
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35
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36 function session.data(conn, data)
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37 data, _ = data:gsub("[%z\255]", "")
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38 log("debug", "Parsing: %s", data)
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39
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40 local ok, err = parser:parse(data)
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41 if not ok then
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42 log("debug", "Received invalid XML (%s) %d bytes: %s", tostring(err), #data,
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43 data:sub(1, 300):gsub("[\r\n]+", " "):gsub("[%z\1-\31]", "_"));
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44 session:close("xml-not-well-formed");
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45 end
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46 end
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47 end
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48
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49 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
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50 local default_stream_attr = { ["xmlns:stream"] = "http://etherx.jabber.org/streams", xmlns = stream_callbacks.default_ns, version = "1.0", id = "" };
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51 local function session_close(session, reason)
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52 local log = session.log or log;
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53 if session.conn then
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54 if session.notopen then
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55 session.send("<?xml version='1.0'?>");
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56 session.send(st.stanza("stream:stream", default_stream_attr):top_tag());
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57 end
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58 if reason then
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59 if type(reason) == "string" then -- assume stream error
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60 log("info", "Disconnecting client, <stream:error> is: %s", reason);
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61 session.send(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));
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62 elseif type(reason) == "table" then
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63 if reason.condition then
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64 local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();
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65 if reason.text then
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66 stanza:tag("text", stream_xmlns_attr):text(reason.text):up();
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67 end
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68 if reason.extra then
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69 stanza:add_child(reason.extra);
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70 end
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71 log("info", "Disconnecting client, <stream:error> is: %s", tostring(stanza));
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72 session.send(stanza);
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73 elseif reason.name then -- a stanza
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74 log("info", "Disconnecting client, <stream:error> is: %s", tostring(reason));
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75 session.send(reason);
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76 end
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77 end
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78 end
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79 session.send("</stream:stream>");
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80 session.conn:close();
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81 websocket_listener.ondisconnect(session.conn, (reason and (reason.text or reason.condition)) or reason or "session closed");
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82 end
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83 end
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84
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85
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86 local websocket_listener = { default_mode = "*a" };
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87 function websocket_listener.onincoming(conn, data)
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88 local session = sessions[conn];
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89 if not session then
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90 session = { type = "c2s_unauthed",
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91 conn = conn,
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92 reset_stream = session_reset_stream,
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93 close = session_close,
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94 dispatch_stanza = stream_callbacks.handlestanza,
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95 log = logger.init("websocket"),
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96 secure = conn.ssl };
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97
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98 function session.send(s)
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99 conn:write("\00" .. tostring(s) .. "\255");
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100 end
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101
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102 sessions[conn] = session;
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103 end
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104
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105 session_reset_stream(session);
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106
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107 if data then
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108 session.data(conn, data);
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109 end
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110 end
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111
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112 function websocket_listener.ondisconnect(conn, err)
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113 local session = sessions[conn];
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114 if session then
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115 (session.log or log)("info", "Client disconnected: %s", err);
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116 sm.destroy_session(session, err);
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117 sessions[conn] = nil;
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118 session = nil;
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119 end
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120 end
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121
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122
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123 function handle_request(method, body, request)
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124 if request.method ~= "GET" or request.headers["upgrade"] ~= "WebSocket" or request.headers["connection"] ~= "Upgrade" then
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125 if request.method == "OPTIONS" then
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126 return { headers = default_headers, body = "" };
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127 else
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128 return "<html><body>You really don't look like a Websocket client to me... what do you want?</body></html>";
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129 end
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130 end
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131
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132 local subprotocol = request.headers["Websocket-Protocol"];
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133 if subprotocol ~= nil and subprotocol ~= "XMPP" then
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134 return "<html><body>You really don't look like an XMPP Websocket client to me... what do you want?</body></html>";
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135 end
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136
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137 if not method then
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138 log("debug", "Request %s suffered error %s", tostring(request.id), body);
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139 return;
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140 end
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141
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142 request.conn:setlistener(websocket_listener);
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143 request.write("HTTP/1.1 101 Web Socket Protocol Handshake\r\n");
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144 request.write("Upgrade: WebSocket\r\n");
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145 request.write("Connection: Upgrade\r\n");
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146 request.write("WebSocket-Origin: file://\r\n"); -- FIXME
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147 request.write("WebSocket-Location: ws://localhost:5281/xmpp-websocket\r\n"); -- FIXME
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148 request.write("WebSocket-Protocol: XMPP\r\n");
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149 request.write("\r\n");
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150
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151 return true;
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152 end
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153
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154 local function setup()
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155 local ports = module:get_option("websocket_ports") or { 5281 };
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156 httpserver.new_from_config(ports, handle_request, { base = "xmpp-websocket" });
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157 end
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158 if prosody.start_time then -- already started
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159 setup();
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160 else
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161 prosody.events.add_handler("server-started", setup);
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162 end