prosody
8087f5357f53
util/jwt.lua

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util/jwt.lua @ 12525:8087f5357f53 0.12

mod_smacks: Fix bounce of stanzas directed to full JID on unclean disconnect Fixes #1758 Introduced in 1ea01660c79a In e62025f949f9 to and from was inverted since it changed from acting on a reply to acting on the original stanza (or a clone thereof) Unsure of the purpose of this check, you don't usually send stanzas to your own full JID. Perhaps guarding against routing loops? The check was present in the original commit of mod_smacks, prosody-modules rev 9a7671720dec
author Kim Alvefur <zash@zash.se>
date Fri, 27 May 2022 12:05:47 +0200
parent 11561:d2f33b8fdc96
child 12696:27a72982e331
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c4ded3be7cc0 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