prosody
9889b1815d31
net/stun.lua

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net/stun.lua @ 12370:9889b1815d31

net.stun: Factor out address unpack, an operation common to multiple attributes
author Matthew Wild <mwild1@gmail.com>
date Sat, 05 Mar 2022 11:03:44 +0000
parent 12369:f2ae9c6d1d9f
child 12371:9a8b0c5b4b14
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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 local bit32 = require"util.bitcompat";
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7 local sxor = require"util.strbitop".sxor;
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8
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9 --- Public helpers
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10
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11 -- Following draft-uberti-behave-turn-rest-00, convert a 'secret' string
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12 -- into a username/password pair that can be used to auth to a TURN server
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13 local function get_user_pass_from_secret(secret, ttl, opt_username)
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14 ttl = ttl or 86400;
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15 local username;
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16 if opt_username then
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17 username = ("%d:%s"):format(os.time() + ttl, opt_username);
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18 else
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19 username = ("%d"):format(os.time() + ttl);
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20 end
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21 local password = base64.encode(hashes.hmac_sha1(secret, username));
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22 return username, password, ttl;
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23 end
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24
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25 -- Following RFC 8489 9.2, convert credentials to a HMAC key for signing
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26 local function get_long_term_auth_key(realm, username, password)
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27 return hashes.md5(username..":"..realm..":"..password);
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28 end
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29
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30 --- Packet building/parsing
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31
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32 local packet_methods = {};
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33 local packet_mt = { __index = packet_methods };
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34
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35 local magic_cookie = string.char(0x21, 0x12, 0xA4, 0x42);
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36
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37 local function lookup_table(t)
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38 local lookup = {};
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39 for k, v in pairs(t) do
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40 lookup[k] = v;
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41 lookup[v] = k;
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42 end
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43 return lookup;
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44 end
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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 = lookup_table(methods);
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57
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58 local classes = {
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59 request = 0;
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60 indication = 1;
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61 success = 2;
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62 error = 3;
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63 };
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64 local class_lookup = lookup_table(classes);
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65
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66 local addr_families = { "IPv4", "IPv6" };
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67 local addr_family_lookup = lookup_table(addr_families);
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68
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69 local attributes = {
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70 ["mapped-address"] = 0x0001;
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71 ["username"] = 0x0006;
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72 ["message-integrity"] = 0x0008;
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73 ["error-code"] = 0x0009;
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74 ["unknown-attributes"] = 0x000A;
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75 ["realm"] = 0x0014;
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76 ["nonce"] = 0x0015;
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77 ["xor-mapped-address"] = 0x0020;
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78 ["software"] = 0x8022;
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79 ["alternate-server"] = 0x8023;
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80 ["fingerprint"] = 0x8028;
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81 ["message-integrity-sha256"] = 0x001C;
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82 ["password-algorithm"] = 0x001D;
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83 ["userhash"] = 0x001E;
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84 ["password-algorithms"] = 0x8002;
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85 ["alternate-domains"] = 0x8003;
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86
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87 -- TURN
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88 ["requested-transport"] = 0x0019;
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89 ["xor-peer-address"] = 0x0012;
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90 ["data"] = 0x0013;
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91 ["xor-relayed-address"] = 0x0016;
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92 };
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93 local attribute_lookup = lookup_table(attributes);
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94
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95 function packet_methods:serialize_header(length)
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96 assert(#self.transaction_id == 12, "invalid transaction id length");
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97 local header = struct.pack(">I2I2",
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98 self.type,
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99 length
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100 )..magic_cookie..self.transaction_id;
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101 return header;
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102 end
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103
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104 function packet_methods:serialize()
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105 local payload = table.concat(self.attributes);
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106 return self:serialize_header(#payload)..payload;
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107 end
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108
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109 function packet_methods:is_request()
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110 return bit32.band(self.type, 0x0110) == 0x0000;
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111 end
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112
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113 function packet_methods:is_indication()
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114 return bit32.band(self.type, 0x0110) == 0x0010;
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115 end
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116
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117 function packet_methods:is_success_resp()
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118 return bit32.band(self.type, 0x0110) == 0x0100;
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119 end
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120
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121 function packet_methods:is_err_resp()
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122 return bit32.band(self.type, 0x0110) == 0x0110;
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123 end
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124
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125 function packet_methods:get_method()
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126 local method = bit32.bor(
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127 bit32.rshift(bit32.band(self.type, 0x3E00), 2),
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128 bit32.rshift(bit32.band(self.type, 0x00E0), 1),
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129 bit32.band(self.type, 0x000F)
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130 );
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131 return method, method_lookup[method];
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132 end
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133
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134 function packet_methods:get_class()
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135 local class = bit32.bor(
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136 bit32.rshift(bit32.band(self.type, 0x0100), 7),
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137 bit32.rshift(bit32.band(self.type, 0x0010), 4)
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138 );
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139 return class, class_lookup[class];
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140 end
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141
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142 function packet_methods:set_type(method, class)
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143 if type(method) == "string" then
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144 method = assert(method_lookup[method:lower()], "unknown method: "..method);
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145 end
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146 if type(class) == "string" then
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147 class = assert(classes[class], "unknown class: "..class);
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148 end
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149 self.type = bit32.bor(
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150 bit32.lshift(bit32.band(method, 0x1F80), 2),
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151 bit32.lshift(bit32.band(method, 0x0070), 1),
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152 bit32.band(method, 0x000F),
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153 bit32.lshift(bit32.band(class, 0x0002), 7),
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154 bit32.lshift(bit32.band(class, 0x0001), 4)
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155 );
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156 end
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157
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158 local function _serialize_attribute(attr_type, value)
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159 local len = #value;
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160 local padding = string.rep("\0", (4 - len)%4);
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161 return struct.pack(">I2I2",
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162 attr_type, len
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163 )..value..padding;
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164 end
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165
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166 function packet_methods:add_attribute(attr_type, value)
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167 if type(attr_type) == "string" then
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168 attr_type = assert(attributes[attr_type], "unknown attribute: "..attr_type);
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169 end
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170 table.insert(self.attributes, _serialize_attribute(attr_type, value));
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171 end
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172
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173 function packet_methods:deserialize(bytes)
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174 local type, len, cookie = struct.unpack(">I2I2I4", bytes);
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175 assert(#bytes == (len + 20), "incorrect packet length");
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176 assert(cookie == 0x2112A442, "invalid magic cookie");
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177 self.type = type;
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178 self.transaction_id = bytes:sub(9, 20);
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179 self.attributes = {};
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180 local pos = 21;
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181 while pos < #bytes do
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182 local attr_hdr = bytes:sub(pos, pos+3);
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183 assert(#attr_hdr == 4, "packet truncated in attribute header");
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184 local attr_type, attr_len = struct.unpack(">I2I2", attr_hdr); --luacheck: ignore 211/attr_type
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185 if attr_len == 0 then
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186 table.insert(self.attributes, attr_hdr);
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187 pos = pos + 20;
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188 else
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189 local data = bytes:sub(pos + 4, pos + 3 + attr_len);
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190 assert(#data == attr_len, "packet truncated in attribute value");
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191 table.insert(self.attributes, attr_hdr..data);
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192 local n_padding = (4 - attr_len)%4;
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193 pos = pos + 4 + attr_len + n_padding;
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194 end
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195 end
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196 return self;
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197 end
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198
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199 function packet_methods:get_attribute(attr_type)
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200 if type(attr_type) == "string" then
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201 attr_type = assert(attribute_lookup[attr_type:lower()], "unknown attribute: "..attr_type);
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202 end
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203 for _, attribute in ipairs(self.attributes) do
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204 if struct.unpack(">I2", attribute) == attr_type then
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205 return attribute:sub(5);
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206 end
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207 end
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208 end
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209
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210 function packet_methods:_unpack_address(data, xor)
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211 local family, port = struct.unpack("x>BI2", data);
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212 local addr = data:sub(5);
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213 if xor then
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214 port = bit32.bxor(port, 0x2112);
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215 addr = sxor(addr, magic_cookie..self.transaction_id);
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216 end
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217 return {
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218 family = addr_families[family] or "unknown";
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219 port = port;
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220 address = net.ntop(addr);
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221 };
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222 end
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223
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224
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225 function packet_methods:get_mapped_address()
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226 local data = self:get_attribute("mapped-address");
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227 if not data then return; end
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228 return self:_unpack_address(data, false);
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229 end
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230 function packet_methods:get_xor_mapped_address()
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231 local data = self:get_attribute("xor-mapped-address");
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232 if not data then return; end
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233 return self:_unpack_address(data, true);
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234 end
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235
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236 function packet_methods:add_message_integrity(key)
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237 -- Add attribute with a dummy value so we can artificially increase
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238 -- the packet 'length'
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239 self:add_attribute("message-integrity", string.rep("\0", 20));
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240 -- Get the packet data, minus the message-integrity attribute itself
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241 local pkt = self:serialize():sub(1, -25);
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242 local hash = hashes.hmac_sha1(key, pkt, false);
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243 self.attributes[#self.attributes] = nil;
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244 assert(#hash == 20, "invalid hash length");
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245 self:add_attribute("message-integrity", hash);
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246 end
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247
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248 do
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249 local transports = {
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250 udp = 0x11;
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251 };
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252 function packet_methods:add_requested_transport(transport)
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253 local transport_code = transports[transport];
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254 assert(transport_code, "unsupported transport: "..tostring(transport));
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255 self:add_attribute("requested-transport", string.char(
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256 transport_code, 0x00, 0x00, 0x00
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257 ));
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258 end
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259 end
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260
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261 function packet_methods:get_error()
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262 local err_attr = self:get_attribute("error-code");
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263 if not err_attr then
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264 return nil;
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265 end
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266 local number = err_attr:byte(4);
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267 local class = bit32.band(0x07, err_attr:byte(3));
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268 local msg = err_attr:sub(5);
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269 return (class*100)+number, msg;
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270 end
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271
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272 local function new_packet(method, class)
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273 local p = setmetatable({
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274 transaction_id = random.bytes(12);
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275 length = 0;
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276 attributes = {};
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277 }, packet_mt);
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278 p:set_type(method or "binding", class or "request");
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279 return p;
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280 end
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281
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282 return {
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283 new_packet = new_packet;
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284 get_user_pass_from_secret = get_user_pass_from_secret;
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285 get_long_term_auth_key = get_long_term_auth_key;
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286 };