prosody
31a2bd84191d
util/jwt.lua

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util/jwt.lua @ 12704:31a2bd84191d

util.jwt: All the algorithms (+ all the tests!) Except 'none'. Not implementing that one.
author Matthew Wild <mwild1@gmail.com>
date Sat, 02 Jul 2022 15:29:04 +0100
parent 12702:f63176781940
child 12705:008a7097fdc5
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 local s_gsub = string.gsub;
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2 local crypto = require "util.crypto";
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3 local json = require "util.json";
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4 local hashes = require "util.hashes";
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5 local base64_encode = require "util.encodings".base64.encode;
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6 local base64_decode = require "util.encodings".base64.decode;
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7 local secure_equals = require "util.hashes".equals;
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8
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9 local b64url_rep = { ["+"] = "-", ["/"] = "_", ["="] = "", ["-"] = "+", ["_"] = "/" };
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10 local function b64url(data)
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11 return (s_gsub(base64_encode(data), "[+/=]", b64url_rep));
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12 end
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13 local function unb64url(data)
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14 return base64_decode(s_gsub(data, "[-_]", b64url_rep).."==");
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15 end
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16
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17 local jwt_pattern = "^(([A-Za-z0-9-_]+)%.([A-Za-z0-9-_]+))%.([A-Za-z0-9-_]+)$"
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18 local function decode_jwt(blob, expected_alg)
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19 local signed, bheader, bpayload, signature = string.match(blob, jwt_pattern);
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20 if not signed then
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21 return nil, "invalid-encoding";
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22 end
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23 local header = json.decode(unb64url(bheader));
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24 if not header or type(header) ~= "table" then
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25 return nil, "invalid-header";
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26 elseif header.alg ~= expected_alg then
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27 return nil, "unsupported-algorithm";
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28 end
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29 return signed, signature, bpayload;
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30 end
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31
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32 local function new_static_header(algorithm_name)
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33 return b64url('{"alg":"'..algorithm_name..'","typ":"JWT"}') .. '.';
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34 end
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35
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36 -- HS*** family
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37 local function new_hmac_algorithm(name)
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38 local static_header = new_static_header(name);
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39
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40 local hmac = hashes["hmac_sha"..name:sub(-3)];
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41
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42 local function sign(key, payload)
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43 local encoded_payload = json.encode(payload);
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44 local signed = static_header .. b64url(encoded_payload);
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45 local signature = hmac(key, signed);
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46 return signed .. "." .. b64url(signature);
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47 end
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48
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49 local function verify(key, blob)
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50 local signed, signature, raw_payload = decode_jwt(blob, name);
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51 if not signed then return nil, signature; end -- nil, err
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52
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53 if not secure_equals(b64url(hmac(key, signed)), signature) then
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54 return false, "signature-mismatch";
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55 end
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56 local payload, err = json.decode(unb64url(raw_payload));
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57 if err ~= nil then
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58 return nil, "json-decode-error";
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59 end
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60 return true, payload;
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61 end
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62
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63 local function load_key(key)
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64 assert(type(key) == "string", "key must be string (long, random, secure)");
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65 return key;
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66 end
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67
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68 return { sign = sign, verify = verify, load_key = load_key };
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69 end
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70
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71 local function new_crypto_algorithm(name, key_type, c_sign, c_verify, sig_encode, sig_decode)
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72 local static_header = new_static_header(name);
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73
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74 return {
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75 sign = function (private_key, payload)
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76 local encoded_payload = json.encode(payload);
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77 local signed = static_header .. b64url(encoded_payload);
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78
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79 local signature = c_sign(private_key, signed);
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80 if sig_encode then
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81 signature = sig_encode(signature);
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82 end
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83
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84 return signed.."."..b64url(signature);
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85 end;
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86
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87 verify = function (public_key, blob)
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88 local signed, signature, raw_payload = decode_jwt(blob, name);
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89 if not signed then return nil, signature; end -- nil, err
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90
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91 signature = unb64url(signature);
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92 if sig_decode and signature then
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93 signature = sig_decode(signature);
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94 end
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95 if not signature then
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96 return false, "signature-mismatch";
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97 end
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98
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99 local verify_ok = c_verify(public_key, signed, signature);
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100 if not verify_ok then
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101 return false, "signature-mismatch";
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102 end
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103
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104 local payload, err = json.decode(unb64url(raw_payload));
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105 if err ~= nil then
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106 return nil, "json-decode-error";
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107 end
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108
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109 return true, payload;
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110 end;
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111
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112 load_public_key = function (public_key_pem)
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113 local key = assert(crypto.import_public_pem(public_key_pem));
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114 assert(key:get_type() == key_type, "incorrect key type");
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115 return key;
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116 end;
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117
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118 load_private_key = function (private_key_pem)
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119 local key = assert(crypto.import_private_pem(private_key_pem));
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120 assert(key:get_type() == key_type, "incorrect key type");
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121 return key;
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122 end;
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123 };
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124 end
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125
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126 -- RS***, PS***
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127 local rsa_sign_algos = { RS = "rsassa_pkcs1", PS = "rsassa_pss" };
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128 local function new_rsa_algorithm(name)
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129 local family, digest_bits = name:match("^(..)(...)$");
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130 local c_sign = crypto[rsa_sign_algos[family].."_sha"..digest_bits.."_sign"];
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131 local c_verify = crypto[rsa_sign_algos[family].."_sha"..digest_bits.."_verify"];
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132 return new_crypto_algorithm(name, "rsaEncryption", c_sign, c_verify);
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133 end
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134
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135 -- ES***
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136 local function new_ecdsa_algorithm(name, c_sign, c_verify)
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137 local function encode_ecdsa_sig(der_sig)
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138 local r, s = crypto.parse_ecdsa_signature(der_sig);
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139 return r..s;
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140 end
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141
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142 local function decode_ecdsa_sig(jwk_sig)
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143 return crypto.build_ecdsa_signature(jwk_sig:sub(1, 32), jwk_sig:sub(33, 64));
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144 end
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145 return new_crypto_algorithm(name, "id-ecPublicKey", c_sign, c_verify, encode_ecdsa_sig, decode_ecdsa_sig);
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146 end
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147
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148 local algorithms = {
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149 HS256 = new_hmac_algorithm("HS256"), HS384 = new_hmac_algorithm("HS384"), HS512 = new_hmac_algorithm("HS512");
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150 ES256 = new_ecdsa_algorithm("ES256", crypto.ecdsa_sha256_sign, crypto.ecdsa_sha256_verify);
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151 RS256 = new_rsa_algorithm("RS256"), RS384 = new_rsa_algorithm("RS384"), RS512 = new_rsa_algorithm("RS512");
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152 PS256 = new_rsa_algorithm("PS256"), PS384 = new_rsa_algorithm("PS384"), PS512 = new_rsa_algorithm("PS512");
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153 };
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154
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155 local function new_signer(algorithm, key_input)
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156 local impl = assert(algorithms[algorithm], "Unknown JWT algorithm: "..algorithm);
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157 local key = (impl.load_private_key or impl.load_key)(key_input);
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158 local sign = impl.sign;
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159 return function (payload)
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160 return sign(key, payload);
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161 end
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162 end
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163
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164 local function new_verifier(algorithm, key_input)
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165 local impl = assert(algorithms[algorithm], "Unknown JWT algorithm: "..algorithm);
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166 local key = (impl.load_public_key or impl.load_key)(key_input);
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167 local verify = impl.verify;
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168 return function (token)
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169 return verify(key, token);
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170 end
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171 end
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172
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173 return {
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174 new_signer = new_signer;
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175 new_verifier = new_verifier;
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176 _algorithms = algorithms;
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177 -- Deprecated
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178 sign = algorithms.HS256.sign;
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179 verify = algorithms.HS256.verify;
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180 };
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181