prosody
57c5dd08ff0a
net/websocket/frames.lua

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net/websocket/frames.lua @ 8277:57c5dd08ff0a

prosodyctl: Abort and warn if the config can't be opened after dropping root privileges (fixes #990)
author Kim Alvefur <zash@zash.se>
date Wed, 27 Sep 2017 15:37:10 +0200
parent 7259:d8300985f2bb
child 8442:3a390fa561bf
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 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 random_bytes = require "util.random".bytes;
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11
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12 local bit = assert(softreq"bit" or softreq"bit32",
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13 "No bit module found. See https://prosody.im/doc/depends#bitop");
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14 local band = bit.band;
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15 local bor = bit.bor;
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16 local bxor = bit.bxor;
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17 local lshift = bit.lshift;
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18 local rshift = bit.rshift;
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19
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20 local t_concat = table.concat;
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21 local s_byte = string.byte;
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22 local s_char= string.char;
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23 local s_sub = string.sub;
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24 local s_pack = string.pack;
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25 local s_unpack = string.unpack;
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26
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27 if not s_pack and softreq"struct" then
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28 s_pack = softreq"struct".pack;
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29 s_unpack = softreq"struct".unpack;
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30 end
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31
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32 local function read_uint16be(str, pos)
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33 local l1, l2 = s_byte(str, pos, pos+1);
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34 return l1*256 + l2;
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35 end
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36 -- FIXME: this may lose precision
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37 local function read_uint64be(str, pos)
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38 local l1, l2, l3, l4, l5, l6, l7, l8 = s_byte(str, pos, pos+7);
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39 local h = lshift(l1, 24) + lshift(l2, 16) + lshift(l3, 8) + l4;
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40 local l = lshift(l5, 24) + lshift(l6, 16) + lshift(l7, 8) + l8;
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41 return h * 2^32 + l;
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42 end
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43 local function pack_uint16be(x)
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44 return s_char(rshift(x, 8), band(x, 0xFF));
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45 end
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46 local function get_byte(x, n)
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47 return band(rshift(x, n), 0xFF);
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48 end
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49 local function pack_uint64be(x)
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50 local h = band(x / 2^32, 2^32-1);
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51 return s_char(get_byte(h, 24), get_byte(h, 16), get_byte(h, 8), band(h, 0xFF),
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52 get_byte(x, 24), get_byte(x, 16), get_byte(x, 8), band(x, 0xFF));
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53 end
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54
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55 if s_pack then
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56 function pack_uint16be(x)
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57 return s_pack(">I2", x);
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58 end
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59 function pack_uint64be(x)
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60 return s_pack(">I8", x);
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61 end
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62 end
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63
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64 if s_unpack then
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65 function read_uint16be(str, pos)
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66 return s_unpack(">I2", str, pos);
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67 end
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68 function read_uint64be(str, pos)
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69 return s_unpack(">I8", str, pos);
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70 end
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71 end
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72
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73 local function parse_frame_header(frame)
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74 if #frame < 2 then return; end
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75
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76 local byte1, byte2 = s_byte(frame, 1, 2);
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77 local result = {
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78 FIN = band(byte1, 0x80) > 0;
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79 RSV1 = band(byte1, 0x40) > 0;
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80 RSV2 = band(byte1, 0x20) > 0;
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81 RSV3 = band(byte1, 0x10) > 0;
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82 opcode = band(byte1, 0x0F);
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83
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84 MASK = band(byte2, 0x80) > 0;
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85 length = band(byte2, 0x7F);
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86 };
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87
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88 local length_bytes = 0;
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89 if result.length == 126 then
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90 length_bytes = 2;
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91 elseif result.length == 127 then
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92 length_bytes = 8;
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93 end
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94
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95 local header_length = 2 + length_bytes + (result.MASK and 4 or 0);
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96 if #frame < header_length then return; end
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97
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98 if length_bytes == 2 then
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99 result.length = read_uint16be(frame, 3);
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100 elseif length_bytes == 8 then
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101 result.length = read_uint64be(frame, 3);
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102 end
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103
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104 if result.MASK then
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105 result.key = { s_byte(frame, length_bytes+3, length_bytes+6) };
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106 end
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107
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108 return result, header_length;
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109 end
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110
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111 -- XORs the string `str` with the array of bytes `key`
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112 -- TODO: optimize
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113 local function apply_mask(str, key, from, to)
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114 from = from or 1
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115 if from < 0 then from = #str + from + 1 end -- negative indicies
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116 to = to or #str
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117 if to < 0 then to = #str + to + 1 end -- negative indicies
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118 local key_len = #key
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119 local counter = 0;
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120 local data = {};
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121 for i = from, to do
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122 local key_index = counter%key_len + 1;
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123 counter = counter + 1;
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124 data[counter] = s_char(bxor(key[key_index], s_byte(str, i)));
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125 end
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126 return t_concat(data);
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
127 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
128
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
129 local function parse_frame_body(frame, header, pos)
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
130 if header.MASK then
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
131 return apply_mask(frame, header.key, pos, pos + header.length - 1);
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
132 else
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
133 return frame:sub(pos, pos + header.length - 1);
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
134 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
135 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
136
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
137 local function parse_frame(frame)
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
138 local result, pos = parse_frame_header(frame);
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
139 if result == nil or #frame < (pos + result.length) then return; end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
140 result.data = parse_frame_body(frame, result, pos+1);
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
141 return result, pos + result.length;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
142 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
143
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
144 local function build_frame(desc)
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
145 local data = desc.data or "";
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
146
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
147 assert(desc.opcode and desc.opcode >= 0 and desc.opcode <= 0xF, "Invalid WebSocket opcode");
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
148 if desc.opcode >= 0x8 then
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
149 -- RFC 6455 5.5
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
150 assert(#data <= 125, "WebSocket control frames MUST have a payload length of 125 bytes or less.");
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
151 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
152
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
153 local b1 = bor(desc.opcode,
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
154 desc.FIN and 0x80 or 0,
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
155 desc.RSV1 and 0x40 or 0,
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
156 desc.RSV2 and 0x20 or 0,
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
157 desc.RSV3 and 0x10 or 0);
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
158
6395
e0164b0fcafd net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
159 local b2 = #data;
e0164b0fcafd net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
160 local length_extra;
e0164b0fcafd net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
161 if b2 <= 125 then -- 7-bit length
6389
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
162 length_extra = "";
6395
e0164b0fcafd net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
163 elseif b2 <= 0xFFFF then -- 2-byte length
6389
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
164 b2 = 126;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
165 length_extra = pack_uint16be(#data);
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
166 else -- 8-byte length
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
167 b2 = 127;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
168 length_extra = pack_uint64be(#data);
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
169 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
170
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
171 local key = ""
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
172 if desc.MASK then
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
173 local key_a = desc.key
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
174 if key_a then
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
175 key = s_char(unpack(key_a, 1, 4));
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
176 else
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
177 key = random_bytes(4);
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
178 key_a = {key:byte(1,4)};
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
179 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
180 b2 = bor(b2, 0x80);
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
181 data = apply_mask(data, key_a);
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
182 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
183
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
184 return s_char(b1, b2) .. length_extra .. key .. data
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
185 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
186
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
187 local function parse_close(data)
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
188 local code, message
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
189 if #data >= 2 then
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
190 code = read_uint16be(data, 1);
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
191 if #data > 2 then
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
192 message = s_sub(data, 3);
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
193 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
194 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
195 return code, message
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
196 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
197
6455
b6514e691a70 net.websocket: Make data masking configurable
Florian Zeitz <florob@babelmonkeys.de>
parents: 6398
diff changeset
198 local function build_close(code, message, mask)
6389
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
199 local data = pack_uint16be(code);
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
200 if message then
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
201 assert(#message<=123, "Close reason must be <=123 bytes");
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
202 data = data .. message;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
203 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
204 return build_frame({
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
205 opcode = 0x8;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
206 FIN = true;
6455
b6514e691a70 net.websocket: Make data masking configurable
Florian Zeitz <florob@babelmonkeys.de>
parents: 6398
diff changeset
207 MASK = mask;
6389
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
208 data = data;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
209 });
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
210 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
211
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
212 return {
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
213 parse_header = parse_frame_header;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
214 parse_body = parse_frame_body;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
215 parse = parse_frame;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
216 build = build_frame;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
217 parse_close = parse_close;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
218 build_close = build_close;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
219 };