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util/jwt.lua @ 13090:3cea237f9d1d 0.12
mod_csi_simple: Clear delayed active mode timer on disable
It should not be there afterwards. Noticed that it seems to fire some
time after resumption claiming that the queue size is nil, implying
that it may hold a reference to an expired session somehow.
author | Kim Alvefur <zash@zash.se> |
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date | Mon, 01 May 2023 14:52:38 +0200 |
parent | 11561:d2f33b8fdc96 |
child | 12696:27a72982e331 |
rev | line source |
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util.jwt: Basic JSON Web Token library supporting HS256 tokens
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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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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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51 |