prosody
f75235110045
util/jwt.lua

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util/jwt.lua @ 12707:f75235110045

util.jwt: Add new init() convenience method to obtain both signer and verifier
author Matthew Wild <mwild1@gmail.com>
date Mon, 11 Jul 2022 13:43:01 +0100
parent 12706:108b1758bd8d
child 12735:445f7bd6ffc4
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 local function decode_raw_payload(raw_payload)
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37 local payload, err = json.decode(unb64url(raw_payload));
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38 if err ~= nil then
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39 return nil, "json-decode-error";
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40 elseif type(payload) ~= "table" then
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41 return nil, "invalid-payload-type";
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42 end
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43 return true, payload;
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44 end
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45
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46 -- HS*** family
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47 local function new_hmac_algorithm(name)
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48 local static_header = new_static_header(name);
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49
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50 local hmac = hashes["hmac_sha"..name:sub(-3)];
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51
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52 local function sign(key, payload)
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53 local encoded_payload = json.encode(payload);
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54 local signed = static_header .. b64url(encoded_payload);
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55 local signature = hmac(key, signed);
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56 return signed .. "." .. b64url(signature);
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57 end
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58
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59 local function verify(key, blob)
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60 local signed, signature, raw_payload = decode_jwt(blob, name);
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61 if not signed then return nil, signature; end -- nil, err
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62
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63 if not secure_equals(b64url(hmac(key, signed)), signature) then
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64 return false, "signature-mismatch";
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65 end
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66
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67 return decode_raw_payload(raw_payload);
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68 end
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69
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70 local function load_key(key)
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71 assert(type(key) == "string", "key must be string (long, random, secure)");
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72 return key;
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73 end
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74
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75 return { sign = sign, verify = verify, load_key = load_key };
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76 end
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77
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78 local function new_crypto_algorithm(name, key_type, c_sign, c_verify, sig_encode, sig_decode)
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79 local static_header = new_static_header(name);
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80
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81 return {
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82 sign = function (private_key, payload)
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83 local encoded_payload = json.encode(payload);
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84 local signed = static_header .. b64url(encoded_payload);
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85
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86 local signature = c_sign(private_key, signed);
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87 if sig_encode then
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88 signature = sig_encode(signature);
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89 end
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90
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91 return signed.."."..b64url(signature);
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92 end;
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93
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94 verify = function (public_key, blob)
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95 local signed, signature, raw_payload = decode_jwt(blob, name);
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96 if not signed then return nil, signature; end -- nil, err
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97
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98 signature = unb64url(signature);
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99 if sig_decode and signature then
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100 signature = sig_decode(signature);
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101 end
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102 if not signature then
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103 return false, "signature-mismatch";
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104 end
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105
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106 local verify_ok = c_verify(public_key, signed, signature);
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107 if not verify_ok then
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108 return false, "signature-mismatch";
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109 end
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110
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111 return decode_raw_payload(raw_payload);
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112 end;
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113
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114 load_public_key = function (public_key_pem)
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115 local key = assert(crypto.import_public_pem(public_key_pem));
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116 assert(key:get_type() == key_type, "incorrect key type");
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117 return key;
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118 end;
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119
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120 load_private_key = function (private_key_pem)
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121 local key = assert(crypto.import_private_pem(private_key_pem));
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122 assert(key:get_type() == key_type, "incorrect key type");
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123 return key;
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124 end;
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125 };
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126 end
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127
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128 -- RS***, PS***
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129 local rsa_sign_algos = { RS = "rsassa_pkcs1", PS = "rsassa_pss" };
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130 local function new_rsa_algorithm(name)
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131 local family, digest_bits = name:match("^(..)(...)$");
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132 local c_sign = crypto[rsa_sign_algos[family].."_sha"..digest_bits.."_sign"];
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133 local c_verify = crypto[rsa_sign_algos[family].."_sha"..digest_bits.."_verify"];
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134 return new_crypto_algorithm(name, "rsaEncryption", c_sign, c_verify);
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135 end
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136
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137 -- ES***
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138 local function new_ecdsa_algorithm(name, c_sign, c_verify)
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139 local function encode_ecdsa_sig(der_sig)
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140 local r, s = crypto.parse_ecdsa_signature(der_sig);
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141 return r..s;
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142 end
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143
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144 local function decode_ecdsa_sig(jwk_sig)
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145 return crypto.build_ecdsa_signature(jwk_sig:sub(1, 32), jwk_sig:sub(33, 64));
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146 end
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147 return new_crypto_algorithm(name, "id-ecPublicKey", c_sign, c_verify, encode_ecdsa_sig, decode_ecdsa_sig);
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148 end
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149
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150 local algorithms = {
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151 HS256 = new_hmac_algorithm("HS256"), HS384 = new_hmac_algorithm("HS384"), HS512 = new_hmac_algorithm("HS512");
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152 ES256 = new_ecdsa_algorithm("ES256", crypto.ecdsa_sha256_sign, crypto.ecdsa_sha256_verify);
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153 RS256 = new_rsa_algorithm("RS256"), RS384 = new_rsa_algorithm("RS384"), RS512 = new_rsa_algorithm("RS512");
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154 PS256 = new_rsa_algorithm("PS256"), PS384 = new_rsa_algorithm("PS384"), PS512 = new_rsa_algorithm("PS512");
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155 };
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156
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157 local function new_signer(algorithm, key_input, options)
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158 local impl = assert(algorithms[algorithm], "Unknown JWT algorithm: "..algorithm);
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159 local key = (impl.load_private_key or impl.load_key)(key_input);
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160 local sign = impl.sign;
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161 local default_ttl = (options and options.default_ttl) or 3600;
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162 return function (payload)
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163 local issued_at;
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164 if not payload.iat then
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165 issued_at = os.time();
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166 payload.iat = issued_at;
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167 end
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168 if not payload.exp then
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169 payload.exp = (issued_at or os.time()) + default_ttl;
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170 end
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171 return sign(key, payload);
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172 end
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173 end
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174
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175 local function new_verifier(algorithm, key_input, options)
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176 local impl = assert(algorithms[algorithm], "Unknown JWT algorithm: "..algorithm);
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177 local key = (impl.load_public_key or impl.load_key)(key_input);
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178 local verify = impl.verify;
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179 local check_expiry = not (options and options.accept_expired);
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180 local claim_verifier = options and options.claim_verifier;
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181 return function (token)
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182 local ok, payload = verify(key, token);
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183 if ok then
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184 local expires_at = check_expiry and payload.exp;
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185 if expires_at then
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186 if type(expires_at) ~= "number" then
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187 return nil, "invalid-expiry";
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188 elseif expires_at < os.time() then
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189 return nil, "token-expired";
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190 end
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191 end
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192 if claim_verifier and not claim_verifier(payload) then
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193 return nil, "incorrect-claims";
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194 end
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195 end
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196 return ok, payload;
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197 end
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198 end
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199
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200 local function init(algorithm, private_key, public_key, options)
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201 return new_signer(algorithm, private_key, options), new_verifier(algorithm, public_key or private_key, options);
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202 end
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203
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204 return {
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205 init = init;
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206 new_signer = new_signer;
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207 new_verifier = new_verifier;
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208 -- Exported mainly for tests
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209 _algorithms = algorithms;
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210 -- Deprecated
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211 sign = algorithms.HS256.sign;
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212 verify = algorithms.HS256.verify;
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213 };
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214