prosody
b6514e691a70
net/websocket/frames.lua

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net/websocket/frames.lua @ 6455:b6514e691a70

net.websocket: Make data masking configurable
author Florian Zeitz <florob@babelmonkeys.de>
date Fri, 26 Sep 2014 22:12:21 +0200
parent 6398:ad434f47bfc0
child 6895:f04fadabd5d9
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 -- Prosody IM
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2 -- Copyright (C) 2012 Florian Zeitz
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3 -- Copyright (C) 2014 Daurnimator
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4 --
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
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7 --
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8
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9 local softreq = require "util.dependencies".softreq;
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10 local log = require "util.logger".init "websocket.frames";
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11 local random_bytes = require "util.random".bytes;
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12
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13 local bit;
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14 pcall(function() bit = require"bit"; end);
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15 bit = bit or softreq"bit32"
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16 if not bit then log("error", "No bit module found. Either LuaJIT 2, lua-bitop or Lua 5.2 is required"); end
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17 local band = bit.band;
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18 local bor = bit.bor;
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19 local bxor = bit.bxor;
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20 local lshift = bit.lshift;
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21 local rshift = bit.rshift;
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22
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23 local t_concat = table.concat;
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24 local s_byte = string.byte;
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25 local s_char= string.char;
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26 local s_sub = string.sub;
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27
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28 local function read_uint16be(str, pos)
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29 local l1, l2 = s_byte(str, pos, pos+1);
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30 return l1*256 + l2;
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31 end
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32 -- FIXME: this may lose precision
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33 local function read_uint64be(str, pos)
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34 local l1, l2, l3, l4, l5, l6, l7, l8 = s_byte(str, pos, pos+7);
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35 return lshift(l1, 56) + lshift(l2, 48) + lshift(l3, 40) + lshift(l4, 32)
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36 + lshift(l5, 24) + lshift(l6, 16) + lshift(l7, 8) + l8;
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37 end
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38 local function pack_uint16be(x)
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39 return s_char(rshift(x, 8), band(x, 0xFF));
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40 end
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41 local function get_byte(x, n)
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42 return band(rshift(x, n), 0xFF);
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43 end
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44 local function pack_uint64be(x)
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45 return s_char(rshift(x, 56), get_byte(x, 48), get_byte(x, 40), get_byte(x, 32),
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46 get_byte(x, 24), get_byte(x, 16), get_byte(x, 8), band(x, 0xFF));
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47 end
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48
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49 local function parse_frame_header(frame)
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50 if #frame < 2 then return; end
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51
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52 local byte1, byte2 = s_byte(frame, 1, 2);
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53 local result = {
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54 FIN = band(byte1, 0x80) > 0;
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55 RSV1 = band(byte1, 0x40) > 0;
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56 RSV2 = band(byte1, 0x20) > 0;
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57 RSV3 = band(byte1, 0x10) > 0;
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58 opcode = band(byte1, 0x0F);
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59
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60 MASK = band(byte2, 0x80) > 0;
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61 length = band(byte2, 0x7F);
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62 };
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63
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64 local length_bytes = 0;
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65 if result.length == 126 then
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66 length_bytes = 2;
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67 elseif result.length == 127 then
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68 length_bytes = 8;
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69 end
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70
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71 local header_length = 2 + length_bytes + (result.MASK and 4 or 0);
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72 if #frame < header_length then return; end
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73
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74 if length_bytes == 2 then
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75 result.length = read_uint16be(frame, 3);
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76 elseif length_bytes == 8 then
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77 result.length = read_uint64be(frame, 3);
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78 end
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79
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80 if result.MASK then
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81 result.key = { s_byte(frame, length_bytes+3, length_bytes+6) };
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82 end
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83
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84 return result, header_length;
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85 end
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86
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87 -- XORs the string `str` with the array of bytes `key`
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88 -- TODO: optimize
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89 local function apply_mask(str, key, from, to)
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90 from = from or 1
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91 if from < 0 then from = #str + from + 1 end -- negative indicies
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92 to = to or #str
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93 if to < 0 then to = #str + to + 1 end -- negative indicies
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94 local key_len = #key
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95 local counter = 0;
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96 local data = {};
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97 for i = from, to do
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98 local key_index = counter%key_len + 1;
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99 counter = counter + 1;
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100 data[counter] = s_char(bxor(key[key_index], s_byte(str, i)));
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101 end
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102 return t_concat(data);
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103 end
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104
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105 local function parse_frame_body(frame, header, pos)
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106 if header.MASK then
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107 return apply_mask(frame, header.key, pos, pos + header.length - 1);
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108 else
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109 return frame:sub(pos, pos + header.length - 1);
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110 end
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111 end
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112
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113 local function parse_frame(frame)
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114 local result, pos = parse_frame_header(frame);
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115 if result == nil or #frame < (pos + result.length) then return; end
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116 result.data = parse_frame_body(frame, result, pos+1);
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117 return result, pos + result.length;
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118 end
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119
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120 local function build_frame(desc)
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121 local data = desc.data or "";
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122
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123 assert(desc.opcode and desc.opcode >= 0 and desc.opcode <= 0xF, "Invalid WebSocket opcode");
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124 if desc.opcode >= 0x8 then
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125 -- RFC 6455 5.5
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126 assert(#data <= 125, "WebSocket control frames MUST have a payload length of 125 bytes or less.");
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127 end
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128
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129 local b1 = bor(desc.opcode,
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130 desc.FIN and 0x80 or 0,
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131 desc.RSV1 and 0x40 or 0,
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132 desc.RSV2 and 0x20 or 0,
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daurnimator <quae@daurnimator.com>
parents:
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133 desc.RSV3 and 0x10 or 0);
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134
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135 local b2 = #data;
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daurnimator <quae@daurnimator.com>
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136 local length_extra;
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daurnimator <quae@daurnimator.com>
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137 if b2 <= 125 then -- 7-bit length
6389
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daurnimator <quae@daurnimator.com>
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138 length_extra = "";
6395
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daurnimator <quae@daurnimator.com>
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139 elseif b2 <= 0xFFFF then -- 2-byte length
6389
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daurnimator <quae@daurnimator.com>
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140 b2 = 126;
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daurnimator <quae@daurnimator.com>
parents:
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141 length_extra = pack_uint16be(#data);
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daurnimator <quae@daurnimator.com>
parents:
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142 else -- 8-byte length
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daurnimator <quae@daurnimator.com>
parents:
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143 b2 = 127;
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daurnimator <quae@daurnimator.com>
parents:
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144 length_extra = pack_uint64be(#data);
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daurnimator <quae@daurnimator.com>
parents:
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145 end
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parents:
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146
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daurnimator <quae@daurnimator.com>
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147 local key = ""
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daurnimator <quae@daurnimator.com>
parents:
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148 if desc.MASK then
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daurnimator <quae@daurnimator.com>
parents:
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149 local key_a = desc.key
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daurnimator <quae@daurnimator.com>
parents:
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150 if key_a then
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daurnimator <quae@daurnimator.com>
parents:
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151 key = s_char(unpack(key_a, 1, 4));
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daurnimator <quae@daurnimator.com>
parents:
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152 else
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daurnimator <quae@daurnimator.com>
parents:
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153 key = random_bytes(4);
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daurnimator <quae@daurnimator.com>
parents:
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154 key_a = {key:byte(1,4)};
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daurnimator <quae@daurnimator.com>
parents:
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155 end
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daurnimator <quae@daurnimator.com>
parents:
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156 b2 = bor(b2, 0x80);
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daurnimator <quae@daurnimator.com>
parents:
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157 data = apply_mask(data, key_a);
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
158 end
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daurnimator <quae@daurnimator.com>
parents:
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159
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daurnimator <quae@daurnimator.com>
parents:
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160 return s_char(b1, b2) .. length_extra .. key .. data
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daurnimator <quae@daurnimator.com>
parents:
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161 end
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daurnimator <quae@daurnimator.com>
parents:
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162
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daurnimator <quae@daurnimator.com>
parents:
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163 local function parse_close(data)
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daurnimator <quae@daurnimator.com>
parents:
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164 local code, message
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daurnimator <quae@daurnimator.com>
parents:
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165 if #data >= 2 then
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daurnimator <quae@daurnimator.com>
parents:
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166 code = read_uint16be(data, 1);
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daurnimator <quae@daurnimator.com>
parents:
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167 if #data > 2 then
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daurnimator <quae@daurnimator.com>
parents:
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168 message = s_sub(data, 3);
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daurnimator <quae@daurnimator.com>
parents:
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169 end
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
170 end
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
171 return code, message
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
172 end
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daurnimator <quae@daurnimator.com>
parents:
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173
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Florian Zeitz <florob@babelmonkeys.de>
parents: 6398
diff changeset
174 local function build_close(code, message, mask)
6389
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daurnimator <quae@daurnimator.com>
parents:
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175 local data = pack_uint16be(code);
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daurnimator <quae@daurnimator.com>
parents:
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176 if message then
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daurnimator <quae@daurnimator.com>
parents:
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177 assert(#message<=123, "Close reason must be <=123 bytes");
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daurnimator <quae@daurnimator.com>
parents:
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178 data = data .. message;
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daurnimator <quae@daurnimator.com>
parents:
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179 end
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daurnimator <quae@daurnimator.com>
parents:
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180 return build_frame({
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daurnimator <quae@daurnimator.com>
parents:
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181 opcode = 0x8;
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daurnimator <quae@daurnimator.com>
parents:
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182 FIN = true;
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Florian Zeitz <florob@babelmonkeys.de>
parents: 6398
diff changeset
183 MASK = mask;
6389
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daurnimator <quae@daurnimator.com>
parents:
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184 data = data;
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daurnimator <quae@daurnimator.com>
parents:
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185 });
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
186 end
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
187
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daurnimator <quae@daurnimator.com>
parents:
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188 return {
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
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189 parse_header = parse_frame_header;
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
190 parse_body = parse_frame_body;
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
191 parse = parse_frame;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
192 build = build_frame;
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daurnimator <quae@daurnimator.com>
parents:
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193 parse_close = parse_close;
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
194 build_close = build_close;
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
195 };