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annotate mod_websocket/mod_websocket.lua @ 1029:9d85aded2fb6

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mod_websocket: Add some more error checks for close frames
author Florian Zeitz <florob@babelmonkeys.de>
date Thu, 30 May 2013 23:55:13 +0200
parents 81065638299d
children bbe278a56b0a
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1 -- Prosody IM
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2 -- Copyright (C) 2012 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
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8 module:set_global();
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9
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10 local add_filter = require "util.filters".add_filter;
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11 local sha1 = require "util.hashes".sha1;
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12 local base64 = require "util.encodings".base64.encode;
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13 local softreq = require "util.dependencies".softreq;
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14 local portmanager = require "core.portmanager";
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15
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16 local bit;
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17 pcall(function() bit = require"bit"; end);
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18 bit = bit or softreq"bit32"
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19 if not bit then module:log("error", "No bit module found. Either LuaJIT 2, lua-bitop or Lua 5.2 is required"); end
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20 local band = bit.band;
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21 local bxor = bit.bxor;
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22 local rshift = bit.rshift;
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23
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24 local t_concat = table.concat;
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25 local s_byte = string.byte;
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26 local s_char= string.char;
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27
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28 local cross_domain = module:get_option("cross_domain_websocket");
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29 if cross_domain then
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30 if cross_domain == true then
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31 cross_domain = "*";
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32 elseif type(cross_domain) == "table" then
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33 cross_domain = t_concat(cross_domain, ", ");
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34 end
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35 if type(cross_domain) ~= "string" then
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36 cross_domain = nil;
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37 end
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38 end
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39
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40 module:depends("c2s")
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41 local sessions = module:shared("c2s/sessions");
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42 local c2s_listener = portmanager.get_service("c2s").listener;
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43
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44 -- Websocket helpers
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45 local function parse_frame(frame)
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46 local result = {};
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47 local pos = 1;
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48 local length_bytes = 0;
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49 local tmp_byte;
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50
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51 if #frame < 2 then return; end
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52
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53 tmp_byte = s_byte(frame, pos);
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54 result.FIN = band(tmp_byte, 0x80) > 0;
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55 result.RSV1 = band(tmp_byte, 0x40) > 0;
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56 result.RSV2 = band(tmp_byte, 0x20) > 0;
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57 result.RSV3 = band(tmp_byte, 0x10) > 0;
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58 result.opcode = band(tmp_byte, 0x0F);
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59
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60 pos = pos + 1;
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61 tmp_byte = s_byte(frame, pos);
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62 result.MASK = band(tmp_byte, 0x80) > 0;
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63 result.length = band(tmp_byte, 0x7F);
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64
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65 if result.length == 126 then
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66 length_bytes = 2;
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67 result.length = 0;
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68 elseif result.length == 127 then
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69 length_bytes = 8;
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70 result.length = 0;
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71 end
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72
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73 if #frame < (2 + length_bytes) then return; end
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74
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75 for i = 1, length_bytes do
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76 pos = pos + 1;
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77 result.length = result.length * 256 + s_byte(frame, pos);
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78 end
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79
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80 if #frame < (2 + length_bytes + (result.MASK and 4 or 0) + result.length) then return; end
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81
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82 if result.MASK then
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83 local counter = 0;
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84 local data = {};
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85 local key = {s_byte(frame, pos+1), s_byte(frame, pos+2),
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86 s_byte(frame, pos+3), s_byte(frame, pos+4)}
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87 result.key = key;
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88
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89 pos = pos + 5;
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90 for i = pos, pos + result.length - 1 do
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91 data[#data+1] = s_char(bxor(key[counter+1], s_byte(frame, i)));
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92 counter = (counter + 1) % 4;
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93 end
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94 result.data = t_concat(data, "");
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95 else
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96 result.data = frame:sub(pos + 1, pos + result.length);
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97 end
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98
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99 return result, 2 + length_bytes + (result.MASK and 4 or 0) + result.length;
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100 end
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101
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102 local function build_frame(desc)
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103 local length;
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104 local result = {};
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105 local data = desc.data or "";
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106
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107 result[#result+1] = s_char(0x80 * (desc.FIN and 1 or 0) + desc.opcode);
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108
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109 length = #data;
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110 if length <= 125 then -- 7-bit length
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111 result[#result+1] = s_char(length);
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112 elseif length <= 0xFFFF then -- 2-byte length
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113 result[#result+1] = s_char(126);
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114 result[#result+1] = s_char(rshift(length, 8)) .. s_char(length%0x100);
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115 else -- 8-byte length
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116 result[#result+1] = s_char(127);
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117 local length_bytes = {};
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118 for i = 8, 1, -1 do
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119 length_bytes[i] = s_char(length % 0x100);
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120 length = rshift(length, 8);
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121 end
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122 result[#result+1] = t_concat(length_bytes, "");
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123 end
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124
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125 result[#result+1] = data;
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126
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diff changeset
127 return t_concat(result, "");
687
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Florian Zeitz <florob@babelmonkeys.de>
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diff changeset
128 end
d141375ece4b mod_websocket: Move frame building into a function
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diff changeset
129
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diff changeset
130 --- Filter stuff
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diff changeset
131 function handle_request(event, path)
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diff changeset
132 local request, response = event.request, event.response;
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diff changeset
133 local conn = response.conn;
676
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diff changeset
134
895
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diff changeset
135 if not request.headers.sec_websocket_key then
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diff changeset
136 response.headers.content_type = "text/html";
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parents: 857
diff changeset
137 return [[<!DOCTYPE html><html><head><title>Websocket</title></head><body>
1f4d77104da5 mod_websocket: Simplify by getting the c2s_listener from mod_c2s
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diff changeset
138 <p>It works! Now point your WebSocket client to this URL to connect to Prosody.</p>
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diff changeset
139 </body></html>]];
676
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diff changeset
140 end
54fa9d6d7809 mod_websocket: New mod_c2s based version, still WIP
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diff changeset
141
895
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diff changeset
142 local wants_xmpp = false;
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diff changeset
143 (request.headers.sec_websocket_protocol or ""):gsub("([^,]*),?", function (proto)
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diff changeset
144 if proto == "xmpp" then wants_xmpp = true; end
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diff changeset
145 end);
129
5fc00a3e47b5 mod_websocket: Initial commit
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parents:
diff changeset
146
895
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diff changeset
147 if not wants_xmpp then
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diff changeset
148 return 501;
129
5fc00a3e47b5 mod_websocket: Initial commit
Ali Sabil <ali.sabil@gmail.com>
parents:
diff changeset
149 end
5fc00a3e47b5 mod_websocket: Initial commit
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parents:
diff changeset
150
842
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diff changeset
151 local function websocket_close(code, message)
1026
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diff changeset
152 local data = s_char(rshift(code, 8)) .. s_char(code%0x100) .. message;
842
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diff changeset
153 conn:write(build_frame({opcode = 0x8, FIN = true, data = data}));
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diff changeset
154 conn:close();
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diff changeset
155 end
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diff changeset
156
32df4d13f178 mod_websocket: More robust frame handling
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diff changeset
157 local dataBuffer;
32df4d13f178 mod_websocket: More robust frame handling
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diff changeset
158 local function handle_frame(frame)
1028
81065638299d mod_websocket: Access some values via locales instead of through tables
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diff changeset
159 local opcode = frame.opcode;
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diff changeset
160 local length = frame.length;
842
32df4d13f178 mod_websocket: More robust frame handling
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diff changeset
161 module:log("debug", "Websocket received: %s (%i bytes)", frame.data, #frame.data);
32df4d13f178 mod_websocket: More robust frame handling
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diff changeset
162
32df4d13f178 mod_websocket: More robust frame handling
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diff changeset
163 -- Error cases
32df4d13f178 mod_websocket: More robust frame handling
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diff changeset
164 if frame.RSV1 or frame.RSV2 or frame.RSV3 then -- Reserved bits non zero
32df4d13f178 mod_websocket: More robust frame handling
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diff changeset
165 websocket_close(1002, "Reserved bits not zero");
32df4d13f178 mod_websocket: More robust frame handling
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diff changeset
166 return false;
32df4d13f178 mod_websocket: More robust frame handling
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diff changeset
167 end
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168
1029
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169 if opcode == 0x8 then
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diff changeset
170 if length == 1 then
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diff changeset
171 websocket_close(1002, "Close frame with payload, but too short for status code");
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172 return false;
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diff changeset
173 elseif length >= 2 then
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diff changeset
174 local status_code = s_byte(frame.data, 1) * 256 + s_byte(frame.data, 2)
9d85aded2fb6 mod_websocket: Add some more error checks for close frames
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diff changeset
175 if status_code < 1000 then
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diff changeset
176 websocket_close(1002, "Closed with invalid status code");
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diff changeset
177 return false;
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diff changeset
178 elseif ((status_code > 1003 and status_code < 1007) or status_code > 1011) and status_code < 3000 then
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diff changeset
179 websocket_close(1002, "Cosed with reserved status code");
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180 return false;
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181 end
9d85aded2fb6 mod_websocket: Add some more error checks for close frames
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diff changeset
182 end
842
32df4d13f178 mod_websocket: More robust frame handling
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183 end
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184
1029
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185 if opcode >= 0x8 then
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diff changeset
186 if length > 125 then -- Control frame with too much payload
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187 websocket_close(1002, "Payload too large");
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diff changeset
188 return false;
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diff changeset
189 end
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diff changeset
190
9d85aded2fb6 mod_websocket: Add some more error checks for close frames
Florian Zeitz <florob@babelmonkeys.de>
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diff changeset
191 if not frame.FIN then -- Fragmented control frame
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diff changeset
192 websocket_close(1002, "Fragmented control frame");
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193 return false;
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diff changeset
194 end
842
32df4d13f178 mod_websocket: More robust frame handling
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195 end
690
5acc203972f3 mod_websocket: Add fragmentation support
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diff changeset
196
1028
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197 if (opcode > 0x2 and opcode < 0x8) or (opcode > 0xA) then
842
32df4d13f178 mod_websocket: More robust frame handling
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diff changeset
198 websocket_close(1002, "Reserved opcode");
32df4d13f178 mod_websocket: More robust frame handling
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diff changeset
199 return false;
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diff changeset
200 end
32df4d13f178 mod_websocket: More robust frame handling
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diff changeset
201
1028
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diff changeset
202 if opcode == 0x0 and not dataBuffer then
842
32df4d13f178 mod_websocket: More robust frame handling
Florian Zeitz <florob@babelmonkeys.de>
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diff changeset
203 websocket_close(1002, "Unexpected continuation frame");
32df4d13f178 mod_websocket: More robust frame handling
Florian Zeitz <florob@babelmonkeys.de>
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diff changeset
204 return false;
32df4d13f178 mod_websocket: More robust frame handling
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parents: 840
diff changeset
205 end
32df4d13f178 mod_websocket: More robust frame handling
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diff changeset
206
1028
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diff changeset
207 if (opcode == 0x1 or opcode == 0x2) and dataBuffer then
842
32df4d13f178 mod_websocket: More robust frame handling
Florian Zeitz <florob@babelmonkeys.de>
parents: 840
diff changeset
208 websocket_close(1002, "Continuation frame expected");
32df4d13f178 mod_websocket: More robust frame handling
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diff changeset
209 return false;
32df4d13f178 mod_websocket: More robust frame handling
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diff changeset
210 end
32df4d13f178 mod_websocket: More robust frame handling
Florian Zeitz <florob@babelmonkeys.de>
parents: 840
diff changeset
211
32df4d13f178 mod_websocket: More robust frame handling
Florian Zeitz <florob@babelmonkeys.de>
parents: 840
diff changeset
212 -- Valid cases
1028
81065638299d mod_websocket: Access some values via locales instead of through tables
Florian Zeitz <florob@babelmonkeys.de>
parents: 1027
diff changeset
213 if opcode == 0x0 then -- Continuation frame
1027
6a2dfa8af421 mod_websocket: Optimize string concatenation
Florian Zeitz <florob@babelmonkeys.de>
parents: 1026
diff changeset
214 dataBuffer[#dataBuffer+1] = frame.data;
1028
81065638299d mod_websocket: Access some values via locales instead of through tables
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parents: 1027
diff changeset
215 elseif opcode == 0x1 then -- Text frame
1027
6a2dfa8af421 mod_websocket: Optimize string concatenation
Florian Zeitz <florob@babelmonkeys.de>
parents: 1026
diff changeset
216 dataBuffer = {frame.data};
1028
81065638299d mod_websocket: Access some values via locales instead of through tables
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diff changeset
217 elseif opcode == 0x2 then -- Binary frame
842
32df4d13f178 mod_websocket: More robust frame handling
Florian Zeitz <florob@babelmonkeys.de>
parents: 840
diff changeset
218 websocket_close(1003, "Only text frames are supported");
895
1f4d77104da5 mod_websocket: Simplify by getting the c2s_listener from mod_c2s
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parents: 857
diff changeset
219 return;
1028
81065638299d mod_websocket: Access some values via locales instead of through tables
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diff changeset
220 elseif opcode == 0x8 then -- Close request
842
32df4d13f178 mod_websocket: More robust frame handling
Florian Zeitz <florob@babelmonkeys.de>
parents: 840
diff changeset
221 websocket_close(1000, "Goodbye");
895
1f4d77104da5 mod_websocket: Simplify by getting the c2s_listener from mod_c2s
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parents: 857
diff changeset
222 return;
1028
81065638299d mod_websocket: Access some values via locales instead of through tables
Florian Zeitz <florob@babelmonkeys.de>
parents: 1027
diff changeset
223 elseif opcode == 0x9 then -- Ping frame
691
04662cc35280 mod_websocket: Answer ping frames
Florian Zeitz <florob@babelmonkeys.de>
parents: 690
diff changeset
224 frame.opcode = 0xA;
04662cc35280 mod_websocket: Answer ping frames
Florian Zeitz <florob@babelmonkeys.de>
parents: 690
diff changeset
225 conn:write(build_frame(frame));
895
1f4d77104da5 mod_websocket: Simplify by getting the c2s_listener from mod_c2s
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diff changeset
226 return "";
690
5acc203972f3 mod_websocket: Add fragmentation support
Florian Zeitz <florob@babelmonkeys.de>
parents: 689
diff changeset
227 else
1028
81065638299d mod_websocket: Access some values via locales instead of through tables
Florian Zeitz <florob@babelmonkeys.de>
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diff changeset
228 log("warn", "Received frame with unsupported opcode %i", opcode);
895
1f4d77104da5 mod_websocket: Simplify by getting the c2s_listener from mod_c2s
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diff changeset
229 return "";
690
5acc203972f3 mod_websocket: Add fragmentation support
Florian Zeitz <florob@babelmonkeys.de>
parents: 689
diff changeset
230 end
676
54fa9d6d7809 mod_websocket: New mod_c2s based version, still WIP
Florian Zeitz <florob@babelmonkeys.de>
parents: 129
diff changeset
231
690
5acc203972f3 mod_websocket: Add fragmentation support
Florian Zeitz <florob@babelmonkeys.de>
parents: 689
diff changeset
232 if frame.FIN then
1027
6a2dfa8af421 mod_websocket: Optimize string concatenation
Florian Zeitz <florob@babelmonkeys.de>
parents: 1026
diff changeset
233 local data = t_concat(dataBuffer, "");
842
32df4d13f178 mod_websocket: More robust frame handling
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parents: 840
diff changeset
234 dataBuffer = nil;
895
1f4d77104da5 mod_websocket: Simplify by getting the c2s_listener from mod_c2s
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parents: 857
diff changeset
235 return data;
676
54fa9d6d7809 mod_websocket: New mod_c2s based version, still WIP
Florian Zeitz <florob@babelmonkeys.de>
parents: 129
diff changeset
236 end
895
1f4d77104da5 mod_websocket: Simplify by getting the c2s_listener from mod_c2s
Florian Zeitz <florob@babelmonkeys.de>
parents: 857
diff changeset
237 return "";
842
32df4d13f178 mod_websocket: More robust frame handling
Florian Zeitz <florob@babelmonkeys.de>
parents: 840
diff changeset
238 end
32df4d13f178 mod_websocket: More robust frame handling
Florian Zeitz <florob@babelmonkeys.de>
parents: 840
diff changeset
239
895
1f4d77104da5 mod_websocket: Simplify by getting the c2s_listener from mod_c2s
Florian Zeitz <florob@babelmonkeys.de>
parents: 857
diff changeset
240 conn:setlistener(c2s_listener);
1f4d77104da5 mod_websocket: Simplify by getting the c2s_listener from mod_c2s
Florian Zeitz <florob@babelmonkeys.de>
parents: 857
diff changeset
241 c2s_listener.onconnect(conn);
1f4d77104da5 mod_websocket: Simplify by getting the c2s_listener from mod_c2s
Florian Zeitz <florob@babelmonkeys.de>
parents: 857
diff changeset
242
842
32df4d13f178 mod_websocket: More robust frame handling
Florian Zeitz <florob@babelmonkeys.de>
parents: 840
diff changeset
243 local frameBuffer = "";
895
1f4d77104da5 mod_websocket: Simplify by getting the c2s_listener from mod_c2s
Florian Zeitz <florob@babelmonkeys.de>
parents: 857
diff changeset
244 add_filter(sessions[conn], "bytes/in", function(data)
1027
6a2dfa8af421 mod_websocket: Optimize string concatenation
Florian Zeitz <florob@babelmonkeys.de>
parents: 1026
diff changeset
245 local cache = {};
842
32df4d13f178 mod_websocket: More robust frame handling
Florian Zeitz <florob@babelmonkeys.de>
parents: 840
diff changeset
246 frameBuffer = frameBuffer .. data;
32df4d13f178 mod_websocket: More robust frame handling
Florian Zeitz <florob@babelmonkeys.de>
parents: 840
diff changeset
247 local frame, length = parse_frame(frameBuffer);
32df4d13f178 mod_websocket: More robust frame handling
Florian Zeitz <florob@babelmonkeys.de>
parents: 840
diff changeset
248
32df4d13f178 mod_websocket: More robust frame handling
Florian Zeitz <florob@babelmonkeys.de>
parents: 840
diff changeset
249 while frame do
32df4d13f178 mod_websocket: More robust frame handling
Florian Zeitz <florob@babelmonkeys.de>
parents: 840
diff changeset
250 frameBuffer = frameBuffer:sub(length + 1);
895
1f4d77104da5 mod_websocket: Simplify by getting the c2s_listener from mod_c2s
Florian Zeitz <florob@babelmonkeys.de>
parents: 857
diff changeset
251 local result = handle_frame(frame);
1f4d77104da5 mod_websocket: Simplify by getting the c2s_listener from mod_c2s
Florian Zeitz <florob@babelmonkeys.de>
parents: 857
diff changeset
252 if not result then return; end
1027
6a2dfa8af421 mod_websocket: Optimize string concatenation
Florian Zeitz <florob@babelmonkeys.de>
parents: 1026
diff changeset
253 cache[#cache+1] = result;
842
32df4d13f178 mod_websocket: More robust frame handling
Florian Zeitz <florob@babelmonkeys.de>
parents: 840
diff changeset
254 frame, length = parse_frame(frameBuffer);
32df4d13f178 mod_websocket: More robust frame handling
Florian Zeitz <florob@babelmonkeys.de>
parents: 840
diff changeset
255 end
1027
6a2dfa8af421 mod_websocket: Optimize string concatenation
Florian Zeitz <florob@babelmonkeys.de>
parents: 1026
diff changeset
256 return t_concat(cache, "");
844
a0987c0e4e1d mod_websocket: Check whether the xmpp sub-protocol was requested
Florian Zeitz <florob@babelmonkeys.de>
parents: 842
diff changeset
257 end);
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258
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259 add_filter(sessions[conn], "bytes/out", function(data)
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260 return build_frame({ FIN = true, opcode = 0x01, data = tostring(data)});
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261 end);
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262
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263 response.status_code = 101;
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264 response.headers.upgrade = "websocket";
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265 response.headers.connection = "Upgrade";
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266 response.headers.sec_webSocket_accept = base64(sha1(request.headers.sec_websocket_key .. "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"));
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267 response.headers.sec_webSocket_protocol = "xmpp";
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268 response.headers.access_control_allow_origin = cross_domain;
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269
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270 return "";
129
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271 end
676
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272
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273 function module.add_host(module)
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274 module:depends("http");
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275 module:provides("http", {
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276 name = "websocket";
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277 default_path = "xmpp-websocket";
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278 route = {
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279 ["GET"] = handle_request;
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280 ["GET /"] = handle_request;
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281 };
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282 });
129
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283 end