prosody
eca44e058eed
net/stun.lua

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net/stun.lua @ 13196:eca44e058eed

util.human.io: Use tail call in test to get correct line numbers This is probably not guaranteed to work and might vary with Lua version, but it's good enough for me to get accurate line numbers out of Busted that don't all point to the test() function.
author Kim Alvefur <zash@zash.se>
date Sun, 16 Jul 2023 18:42:58 +0200
parent 12974:ba409c67353b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
12974
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1 local base64 = require "prosody.util.encodings".base64;
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2 local hashes = require "prosody.util.hashes";
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3 local net = require "prosody.util.net";
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4 local random = require "prosody.util.random";
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5 local struct = require "prosody.util.struct";
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6 local bit32 = require"prosody.util.bitcompat";
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7 local sxor = require"prosody.util.strbitop".sxor;
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8 local new_ip = require "prosody.util.ip".new_ip;
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9
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10 --- Public helpers
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11
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12 -- Following draft-uberti-behave-turn-rest-00, convert a 'secret' string
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13 -- into a username/password pair that can be used to auth to a TURN server
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14 local function get_user_pass_from_secret(secret, ttl, opt_username)
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15 ttl = ttl or 86400;
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16 local username;
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17 if opt_username then
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18 username = ("%d:%s"):format(os.time() + ttl, opt_username);
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19 else
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20 username = ("%d"):format(os.time() + ttl);
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21 end
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22 local password = base64.encode(hashes.hmac_sha1(secret, username));
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23 return username, password, ttl;
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24 end
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25
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26 -- Following RFC 8489 9.2, convert credentials to a HMAC key for signing
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27 local function get_long_term_auth_key(realm, username, password)
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28 return hashes.md5(username..":"..realm..":"..password);
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29 end
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30
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31 --- Packet building/parsing
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32
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33 local packet_methods = {};
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34 local packet_mt = { __index = packet_methods };
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35
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36 local magic_cookie = string.char(0x21, 0x12, 0xA4, 0x42);
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37
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38 local function lookup_table(t)
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39 local lookup = {};
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40 for k, v in pairs(t) do
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41 lookup[k] = v;
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42 lookup[v] = k;
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43 end
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44 return lookup;
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45 end
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46
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47 local methods = {
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48 binding = 0x001;
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49 -- TURN
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50 allocate = 0x003;
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51 refresh = 0x004;
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52 send = 0x006;
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53 data = 0x007;
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54 ["create-permission"] = 0x008;
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55 ["channel-bind"] = 0x009;
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56 };
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57 local method_lookup = lookup_table(methods);
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58
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59 local classes = {
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60 request = 0;
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61 indication = 1;
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62 success = 2;
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63 error = 3;
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64 };
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65 local class_lookup = lookup_table(classes);
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66
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67 local addr_families = { "IPv4", "IPv6" };
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68 local addr_family_lookup = lookup_table(addr_families);
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69
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70 local attributes = {
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71 ["mapped-address"] = 0x0001;
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72 ["username"] = 0x0006;
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73 ["message-integrity"] = 0x0008;
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74 ["error-code"] = 0x0009;
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75 ["unknown-attributes"] = 0x000A;
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76 ["realm"] = 0x0014;
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77 ["nonce"] = 0x0015;
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78 ["xor-mapped-address"] = 0x0020;
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79 ["software"] = 0x8022;
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80 ["alternate-server"] = 0x8023;
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81 ["fingerprint"] = 0x8028;
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82 ["message-integrity-sha256"] = 0x001C;
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83 ["password-algorithm"] = 0x001D;
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84 ["userhash"] = 0x001E;
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85 ["password-algorithms"] = 0x8002;
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86 ["alternate-domains"] = 0x8003;
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87
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88 -- TURN
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89 ["requested-transport"] = 0x0019;
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90 ["xor-peer-address"] = 0x0012;
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91 ["data"] = 0x0013;
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92 ["xor-relayed-address"] = 0x0016;
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93 };
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94 local attribute_lookup = lookup_table(attributes);
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95
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96 function packet_methods:serialize_header(length)
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97 assert(#self.transaction_id == 12, "invalid transaction id length");
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98 local header = struct.pack(">I2I2",
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99 self.type,
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100 length
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101 )..magic_cookie..self.transaction_id;
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102 return header;
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103 end
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104
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105 function packet_methods:serialize()
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106 local payload = table.concat(self.attributes);
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107 return self:serialize_header(#payload)..payload;
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108 end
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109
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110 function packet_methods:is_request()
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111 return bit32.band(self.type, 0x0110) == 0x0000;
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112 end
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113
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114 function packet_methods:is_indication()
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115 return bit32.band(self.type, 0x0110) == 0x0010;
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116 end
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117
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118 function packet_methods:is_success_resp()
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119 return bit32.band(self.type, 0x0110) == 0x0100;
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120 end
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121
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122 function packet_methods:is_err_resp()
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123 return bit32.band(self.type, 0x0110) == 0x0110;
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124 end
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125
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126 function packet_methods:get_method()
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127 local method = bit32.bor(
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128 bit32.rshift(bit32.band(self.type, 0x3E00), 2),
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129 bit32.rshift(bit32.band(self.type, 0x00E0), 1),
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130 bit32.band(self.type, 0x000F)
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131 );
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132 return method, method_lookup[method];
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133 end
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134
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135 function packet_methods:get_class()
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136 local class = bit32.bor(
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137 bit32.rshift(bit32.band(self.type, 0x0100), 7),
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138 bit32.rshift(bit32.band(self.type, 0x0010), 4)
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139 );
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140 return class, class_lookup[class];
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141 end
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142
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143 function packet_methods:set_type(method, class)
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144 if type(method) == "string" then
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145 method = assert(method_lookup[method:lower()], "unknown method: "..method);
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146 end
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147 if type(class) == "string" then
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148 class = assert(classes[class], "unknown class: "..class);
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149 end
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150 self.type = bit32.bor(
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151 bit32.lshift(bit32.band(method, 0x1F80), 2),
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152 bit32.lshift(bit32.band(method, 0x0070), 1),
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153 bit32.band(method, 0x000F),
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154 bit32.lshift(bit32.band(class, 0x0002), 7),
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155 bit32.lshift(bit32.band(class, 0x0001), 4)
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156 );
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157 end
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158
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159 local function _serialize_attribute(attr_type, value)
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160 local len = #value;
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161 local padding = string.rep("\0", (4 - len)%4);
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162 return struct.pack(">I2I2",
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163 attr_type, len
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164 )..value..padding;
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165 end
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166
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167 function packet_methods:add_attribute(attr_type, value)
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168 if type(attr_type) == "string" then
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169 attr_type = assert(attributes[attr_type], "unknown attribute: "..attr_type);
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170 end
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171 table.insert(self.attributes, _serialize_attribute(attr_type, value));
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172 end
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173
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174 function packet_methods:deserialize(bytes)
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175 local type, len, cookie = struct.unpack(">I2I2I4", bytes);
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176 assert(#bytes == (len + 20), "incorrect packet length");
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177 assert(cookie == 0x2112A442, "invalid magic cookie");
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178 self.type = type;
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179 self.transaction_id = bytes:sub(9, 20);
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180 self.attributes = {};
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181 local pos = 21;
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182 while pos < #bytes do
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183 local attr_hdr = bytes:sub(pos, pos+3);
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184 assert(#attr_hdr == 4, "packet truncated in attribute header");
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185 local attr_type, attr_len = struct.unpack(">I2I2", attr_hdr); --luacheck: ignore 211/attr_type
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186 if attr_len == 0 then
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187 table.insert(self.attributes, attr_hdr);
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188 pos = pos + 20;
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189 else
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190 local data = bytes:sub(pos + 4, pos + 3 + attr_len);
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191 assert(#data == attr_len, "packet truncated in attribute value");
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192 table.insert(self.attributes, attr_hdr..data);
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193 local n_padding = (4 - attr_len)%4;
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194 pos = pos + 4 + attr_len + n_padding;
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195 end
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196 end
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197 return self;
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198 end
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199
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200 function packet_methods:get_attribute(attr_type, idx)
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201 idx = math.max(idx or 1, 1);
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202 if type(attr_type) == "string" then
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203 attr_type = assert(attribute_lookup[attr_type:lower()], "unknown attribute: "..attr_type);
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204 end
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205 for _, attribute in ipairs(self.attributes) do
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206 if struct.unpack(">I2", attribute) == attr_type then
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207 if idx == 1 then
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208 return attribute:sub(5);
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209 else
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210 idx = idx - 1;
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211 end
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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 function packet_methods:_unpack_address(data, xor)
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217 local family, port = struct.unpack("x>BI2", data);
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218 local addr = data:sub(5);
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219 if xor then
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220 port = bit32.bxor(port, 0x2112);
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221 addr = sxor(addr, magic_cookie..self.transaction_id);
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222 end
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223 return {
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224 family = addr_families[family] or "unknown";
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225 port = port;
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226 address = net.ntop(addr);
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227 };
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228 end
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229
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230 function packet_methods:_pack_address(family, addr, port, xor)
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231 if xor then
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232 port = bit32.bxor(port, 0x2112);
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233 addr = sxor(addr, magic_cookie..self.transaction_id);
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234 end
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235 local family_port = struct.pack("x>BI2", family, port);
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236 return family_port..addr
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237 end
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238
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239 function packet_methods:get_mapped_address()
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240 local data = self:get_attribute("mapped-address");
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241 if not data then return; end
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242 return self:_unpack_address(data, false);
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243 end
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244
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245 function packet_methods:get_xor_mapped_address()
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246 local data = self:get_attribute("xor-mapped-address");
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247 if not data then return; end
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248 return self:_unpack_address(data, true);
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249 end
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250
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251 function packet_methods:add_xor_peer_address(address, port)
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252 local parsed_ip = assert(new_ip(address));
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253 local family = assert(addr_family_lookup[parsed_ip.proto], "Unknown IP address family: "..parsed_ip.proto);
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254 self:add_attribute("xor-peer-address", self:_pack_address(family, parsed_ip.packed, port or 0, true));
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255 end
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256
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257 function packet_methods:get_xor_relayed_address(idx)
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258 local data = self:get_attribute("xor-relayed-address", idx);
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259 if not data then return; end
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260 return self:_unpack_address(data, true);
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261 end
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262
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263 function packet_methods:get_xor_relayed_addresses()
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264 return {
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265 self:get_xor_relayed_address(1);
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266 self:get_xor_relayed_address(2);
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267 };
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268 end
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269
12356
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270 function packet_methods:add_message_integrity(key)
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271 -- Add attribute with a dummy value so we can artificially increase
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272 -- the packet 'length'
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273 self:add_attribute("message-integrity", string.rep("\0", 20));
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274 -- Get the packet data, minus the message-integrity attribute itself
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275 local pkt = self:serialize():sub(1, -25);
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276 local hash = hashes.hmac_sha1(key, pkt, false);
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277 self.attributes[#self.attributes] = nil;
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278 assert(#hash == 20, "invalid hash length");
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279 self:add_attribute("message-integrity", hash);
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280 end
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281
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282 do
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283 local transports = {
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284 udp = 0x11;
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285 };
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286 function packet_methods:add_requested_transport(transport)
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287 local transport_code = transports[transport];
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288 assert(transport_code, "unsupported transport: "..tostring(transport));
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289 self:add_attribute("requested-transport", string.char(
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290 transport_code, 0x00, 0x00, 0x00
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291 ));
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292 end
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293 end
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294
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295 function packet_methods:get_error()
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296 local err_attr = self:get_attribute("error-code");
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297 if not err_attr then
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298 return nil;
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299 end
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300 local number = err_attr:byte(4);
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301 local class = bit32.band(0x07, err_attr:byte(3));
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302 local msg = err_attr:sub(5);
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303 return (class*100)+number, msg;
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304 end
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305
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306 local function new_packet(method, class)
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307 local p = setmetatable({
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308 transaction_id = random.bytes(12);
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309 length = 0;
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310 attributes = {};
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311 }, packet_mt);
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312 p:set_type(method or "binding", class or "request");
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313 return p;
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314 end
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315
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316 return {
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317 new_packet = new_packet;
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318 get_user_pass_from_secret = get_user_pass_from_secret;
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319 get_long_term_auth_key = get_long_term_auth_key;
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320 };