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0f77e28df5c8
net/stun.lua

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net/stun.lua @ 12356:0f77e28df5c8

net.stun: New library that implements STUN/TURN parsing/serialization
author Matthew Wild <mwild1@gmail.com>
date Fri, 04 Mar 2022 15:23:32 +0000
child 12359:f81488951f81
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
12356
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1 local base64 = require "util.encodings".base64;
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2 local hashes = require "util.hashes";
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3 local net = require "util.net";
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4 local random = require "util.random";
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5 local struct = require "util.struct";
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6
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7 --- Private helpers
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8
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9 -- XORs a string with another string
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10 local function sxor(x, y)
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11 local r = {};
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12 for i = 1, #x do
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13 r[i] = string.char(bit32.bxor(x:byte(i), y:byte(i)));
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14 end
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15 return table.concat(r);
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16 end
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17
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18 --- Public helpers
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19
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20 -- Following draft-uberti-behave-turn-rest-00, convert a 'secret' string
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21 -- into a username/password pair that can be used to auth to a TURN server
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22 local function get_user_pass_from_secret(secret, ttl, opt_username)
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23 ttl = ttl or 86400;
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24 local username;
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25 if opt_username then
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26 username = ("%d:%s"):format(os.time() + ttl, opt_username);
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27 else
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28 username = ("%d"):format(os.time() + ttl);
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29 end
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30 local password = base64.encode(hashes.hmac_sha1(secret, username));
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31 return username, password, ttl;
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32 end
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33
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34 -- Following RFC 8489 9.2, convert credentials to a HMAC key for signing
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35 local function get_long_term_auth_key(realm, username, password)
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36 return hashes.md5(username..":"..realm..":"..password);
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37 end
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38
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39 --- Packet building/parsing
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40
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41 local packet_methods = {};
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42 local packet_mt = { __index = packet_methods };
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43
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44 local magic_cookie = string.char(0x21, 0x12, 0xA4, 0x42);
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45
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46 local methods = {
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47 binding = 0x001;
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48 -- TURN
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49 allocate = 0x003;
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50 refresh = 0x004;
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51 send = 0x006;
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52 data = 0x007;
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53 create_permission = 0x008;
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54 channel_bind = 0x009;
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55 };
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56 local method_lookup = {};
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57 for name, value in pairs(methods) do
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58 method_lookup[name] = value;
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59 method_lookup[value] = name;
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60 end
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61
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62 local classes = {
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63 request = 0;
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64 indication = 1;
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65 success = 2;
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66 error = 3;
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67 };
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68 local class_lookup = {};
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69 for name, value in pairs(classes) do
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70 class_lookup[name] = value;
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71 class_lookup[value] = name;
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72 end
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73
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74 local attributes = {
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75 ["mapped-address"] = 0x0001;
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76 ["username"] = 0x0006;
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77 ["message-integrity"] = 0x0008;
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78 ["error-code"] = 0x0009;
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79 ["unknown-attributes"] = 0x000A;
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80 ["realm"] = 0x0014;
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81 ["nonce"] = 0x0015;
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82 ["xor-mapped-address"] = 0x0020;
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83 ["software"] = 0x8022;
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84 ["alternate-server"] = 0x8023;
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85 ["fingerprint"] = 0x8028;
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86 ["message-integrity-sha256"] = 0x001C;
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87 ["password-algorithm"] = 0x001D;
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88 ["userhash"] = 0x001E;
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89 ["password-algorithms"] = 0x8002;
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90 ["alternate-domains"] = 0x8003;
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91
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92 -- TURN
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93 ["requested-transport"] = 0x0019;
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94 };
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95 local attribute_lookup = {};
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96 for name, value in pairs(attributes) do
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97 attribute_lookup[name] = value;
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98 attribute_lookup[value] = name;
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99 end
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100
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101 function packet_methods:serialize_header(length)
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102 assert(#self.transaction_id == 12, "invalid transaction id length");
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103 local header = struct.pack(">I2I2",
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104 self.type,
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105 length
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106 )..magic_cookie..self.transaction_id;
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107 return header;
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108 end
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109
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110 function packet_methods:serialize()
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111 local payload = table.concat(self.attributes);
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112 return self:serialize_header(#payload)..payload;
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113 end
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114
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115 function packet_methods:is_request()
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116 return bit32.band(self.type, 0x0110) == 0x0000;
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117 end
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118
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119 function packet_methods:is_indication()
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120 return bit32.band(self.type, 0x0110) == 0x0010;
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121 end
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122
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123 function packet_methods:is_success_resp()
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124 return bit32.band(self.type, 0x0110) == 0x0100;
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125 end
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126
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127 function packet_methods:is_err_resp()
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128 return bit32.band(self.type, 0x0110) == 0x0110;
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129 end
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130
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131 function packet_methods:get_method()
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132 local method = bit32.bor(
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133 bit32.rshift(bit32.band(self.type, 0x3E00), 2),
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134 bit32.rshift(bit32.band(self.type, 0x00E0), 1),
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135 bit32.band(self.type, 0x000F)
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136 );
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137 return method, method_lookup[method];
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138 end
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139
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140 function packet_methods:get_class()
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141 local class = bit32.bor(
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142 bit32.rshift(bit32.band(self.type, 0x0100), 7),
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143 bit32.rshift(bit32.band(self.type, 0x0010), 4)
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144 );
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145 return class, class_lookup[class];
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146 end
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147
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148 function packet_methods:set_type(method, class)
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149 if type(method) == "string" then
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150 method = assert(method_lookup[method:lower()], "unknown method: "..method);
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151 end
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152 if type(class) == "string" then
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153 class = assert(classes[class], "unknown class: "..class);
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154 end
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155 self.type = bit32.bor(
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156 bit32.lshift(bit32.band(method, 0x1F80), 2),
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157 bit32.lshift(bit32.band(method, 0x0070), 1),
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158 bit32.band(method, 0x000F),
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159 bit32.lshift(bit32.band(class, 0x0002), 7),
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160 bit32.lshift(bit32.band(class, 0x0001), 4)
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161 );
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162 end
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163
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164 local function _serialize_attribute(attr_type, value)
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165 local len = #value;
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166 local padding = string.rep("\0", (4 - len)%4);
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167 return struct.pack(">I2I2",
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168 attr_type, len
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169 )..value..padding;
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170 end
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171
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172 function packet_methods:add_attribute(attr_type, value)
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173 if type(attr_type) == "string" then
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174 attr_type = assert(attributes[attr_type], "unknown attribute: "..attr_type);
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175 end
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176 table.insert(self.attributes, _serialize_attribute(attr_type, value));
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177 end
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178
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179 function packet_methods:deserialize(bytes)
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180 local type, len, cookie = struct.unpack(">I2I2I4", bytes);
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181 assert(#bytes == (len + 20), "incorrect packet length");
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182 assert(cookie == 0x2112A442, "invalid magic cookie");
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183 self.type = type;
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184 self.transaction_id = bytes:sub(9, 20);
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185 self.attributes = {};
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186 local pos = 21;
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187 while pos < #bytes do
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188 local attr_hdr = bytes:sub(pos, pos+3);
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189 assert(#attr_hdr == 4, "packet truncated in attribute header");
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190 local attr_type, attr_len = struct.unpack(">I2I2", attr_hdr); --luacheck: ignore 211/attr_type
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191 if attr_len == 0 then
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192 table.insert(self.attributes, attr_hdr);
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193 pos = pos + 20;
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194 else
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195 local data = bytes:sub(pos + 4, pos + 3 + attr_len);
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196 assert(#data == attr_len, "packet truncated in attribute value");
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197 table.insert(self.attributes, attr_hdr..data);
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198 local n_padding = (4 - attr_len)%4;
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199 pos = pos + 4 + attr_len + n_padding;
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200 end
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201 end
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202 return self;
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203 end
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204
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205 function packet_methods:get_attribute(attr_type)
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206 if type(attr_type) == "string" then
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207 attr_type = assert(attribute_lookup[attr_type:lower()], "unknown attribute: "..attr_type);
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208 end
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209 for _, attribute in ipairs(self.attributes) do
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210 if struct.unpack(">I2", attribute) == attr_type then
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211 return attribute:sub(5);
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212 end
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213 end
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214 end
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215
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216 local addr_families = { "IPv4", "IPv6" };
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217 function packet_methods:get_mapped_address()
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218 local data = self:get_attribute("mapped-address");
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219 if not data then return; end
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220 local family, port = struct.unpack("x>BI2", data);
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221 local addr = data:sub(5);
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222 return {
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223 family = addr_families[family] or "unknown";
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224 port = port;
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225 address = net.ntop(addr);
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226 };
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227 end
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228
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229 function packet_methods:get_xor_mapped_address()
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230 local data = self:get_attribute("xor-mapped-address");
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231 if not data then return; end
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232 local family, port = struct.unpack("x>BI2", data);
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233 local addr = sxor(data:sub(5), magic_cookie..self.transaction_id);
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234 return {
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235 family = addr_families[family] or "unknown";
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236 port = bit32.bxor(port, 0x2112);
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237 address = net.ntop(addr);
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238 address_raw = data:sub(5);
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239 };
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240 end
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241
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242 function packet_methods:add_message_integrity(key)
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243 -- Add attribute with a dummy value so we can artificially increase
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244 -- the packet 'length'
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245 self:add_attribute("message-integrity", string.rep("\0", 20));
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246 -- Get the packet data, minus the message-integrity attribute itself
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247 local pkt = self:serialize():sub(1, -25);
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248 local hash = hashes.hmac_sha1(key, pkt, false);
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249 self.attributes[#self.attributes] = nil;
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250 assert(#hash == 20, "invalid hash length");
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251 self:add_attribute("message-integrity", hash);
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252 end
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253
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254 do
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255 local transports = {
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256 udp = 0x11;
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257 };
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258 function packet_methods:add_requested_transport(transport)
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259 local transport_code = transports[transport];
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260 assert(transport_code, "unsupported transport: "..tostring(transport));
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261 self:add_attribute("requested-transport", string.char(
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262 transport_code, 0x00, 0x00, 0x00
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263 ));
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264 end
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265 end
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266
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267 function packet_methods:get_error()
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268 local err_attr = self:get_attribute("error-code");
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269 if not err_attr then
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270 return nil;
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271 end
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272 local number = err_attr:byte(4);
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273 local class = bit32.band(0x07, err_attr:byte(3));
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274 local msg = err_attr:sub(5);
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275 return (class*100)+number, msg;
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276 end
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277
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278 local function new_packet(method, class)
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279 local p = setmetatable({
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280 transaction_id = random.bytes(12);
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281 length = 0;
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282 attributes = {};
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283 }, packet_mt);
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284 p:set_type(method or "binding", class or "request");
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285 return p;
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286 end
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287
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288 return {
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289 new_packet = new_packet;
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290 get_user_pass_from_secret = get_user_pass_from_secret;
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291 get_long_term_auth_key = get_long_term_auth_key;
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292 };