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util/jwt.lua @ 11590:5aafb832c91b
core.portmanager: Fix race condition in initialization of SNI cert map
Under some circumstances when hosts and modules are loaded in some
certain order, entries end up missing from the SNI map. This manifests
in e.g. `curl https://localhost:5281/` giving an error about
"unrecognized name".
The `service` argument is `nil` when invoked from the "host-activated"
event, leading it to iterating over every service. And then it would not
be fetching e.g. `http_host` from the config, which explains why https
would sometimes not work due to the missing name entry.
Because when `service` is included, this limits the iteration to
matching entries, while also returning the same value as the `name` loop
variable. Because `name == service when service != nil` we can use name
instead in the body of the loop.
author | Kim Alvefur <zash@zash.se> |
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date | Fri, 28 May 2021 17:09:22 +0200 |
parent | 11561:d2f33b8fdc96 |
child | 12696:27a72982e331 |
rev | line source |
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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 |