prosody
a2a0e00cbd24
util/jwt.lua

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util/jwt.lua @ 12004:a2a0e00cbd24

mod_http_file_share: Back out 876e1b6d6ae4
author Kim Alvefur <zash@zash.se>
date Fri, 03 Dec 2021 10:43:02 +0100
parent 11561:d2f33b8fdc96
child 12696:27a72982e331
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c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
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1 local s_gsub = string.gsub;
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2 local json = require "util.json";
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3 local hashes = require "util.hashes";
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4 local base64_encode = require "util.encodings".base64.encode;
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5 local base64_decode = require "util.encodings".base64.decode;
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d2f33b8fdc96 util.jwt: Use constant-time comparison with expected signature
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6 local secure_equals = require "util.hashes".equals;
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7
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8 local b64url_rep = { ["+"] = "-", ["/"] = "_", ["="] = "", ["-"] = "+", ["_"] = "/" };
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9 local function b64url(data)
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10 return (s_gsub(base64_encode(data), "[+/=]", b64url_rep));
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11 end
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12 local function unb64url(data)
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13 return base64_decode(s_gsub(data, "[-_]", b64url_rep).."==");
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14 end
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15
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16 local static_header = b64url('{"alg":"HS256","typ":"JWT"}') .. '.';
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17
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18 local function sign(key, payload)
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19 local encoded_payload = json.encode(payload);
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20 local signed = static_header .. b64url(encoded_payload);
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21 local signature = hashes.hmac_sha256(key, signed);
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22 return signed .. "." .. b64url(signature);
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23 end
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24
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25 local jwt_pattern = "^(([A-Za-z0-9-_]+)%.([A-Za-z0-9-_]+))%.([A-Za-z0-9-_]+)$"
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26 local function verify(key, blob)
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27 local signed, bheader, bpayload, signature = string.match(blob, jwt_pattern);
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28 if not signed then
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29 return nil, "invalid-encoding";
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30 end
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31 local header = json.decode(unb64url(bheader));
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32 if not header or type(header) ~= "table" then
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33 return nil, "invalid-header";
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34 elseif header.alg ~= "HS256" then
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35 return nil, "unsupported-algorithm";
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36 end
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37 if not secure_equals(b64url(hashes.hmac_sha256(key, signed)), signature) then
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38 return false, "signature-mismatch";
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39 end
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40 local payload, err = json.decode(unb64url(bpayload));
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41 if err ~= nil then
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42 return nil, "json-decode-error";
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43 end
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44 return true, payload;
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45 end
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46
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47 return {
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48 sign = sign;
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49 verify = verify;
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50 };
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