prosody
95f33a006c03
net/stun.lua

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net/stun.lua @ 12431:95f33a006c03 0.12

mod_external_services: Move error message to correct place (fix #1725) This message was misplaced in c4599a7c534c when the @type and @host check was introduced.
author Kim Alvefur <zash@zash.se>
date Wed, 23 Mar 2022 15:29:01 +0100
parent 12374:0602245fc84e
child 12974:ba409c67353b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 local new_ip = require "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 };