prosody
25e0ec11b4e4
util/jwt.lua

Find changesets by keywords by author, files, the commit message, revision number or hash, or revset expression.

Software / code / prosody

Annotate

util/jwt.lua @ 10889:25e0ec11b4e4

util.human.units: Put math functions into locals Primarily because the next commit will deal with math.log behaving differently on Lua 5.1 and that's eaiser with locals.
author Kim Alvefur <zash@zash.se>
date Wed, 03 Jun 2020 20:16:00 +0200
parent 10660:c4ded3be7cc0
child 11561:d2f33b8fdc96
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
10660
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
1 local s_gsub = string.gsub;
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
2 local json = require "util.json";
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
3 local hashes = require "util.hashes";
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
4 local base64_encode = require "util.encodings".base64.encode;
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
5 local base64_decode = require "util.encodings".base64.decode;
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
6
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
7 local b64url_rep = { ["+"] = "-", ["/"] = "_", ["="] = "", ["-"] = "+", ["_"] = "/" };
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
8 local function b64url(data)
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
9 return (s_gsub(base64_encode(data), "[+/=]", b64url_rep));
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
10 end
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
11 local function unb64url(data)
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
12 return base64_decode(s_gsub(data, "[-_]", b64url_rep).."==");
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
13 end
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
14
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
15 local static_header = b64url('{"alg":"HS256","typ":"JWT"}') .. '.';
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
16
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
17 local function sign(key, payload)
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
18 local encoded_payload = json.encode(payload);
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
19 local signed = static_header .. b64url(encoded_payload);
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
20 local signature = hashes.hmac_sha256(key, signed);
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
21 return signed .. "." .. b64url(signature);
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
22 end
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
23
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
24 local jwt_pattern = "^(([A-Za-z0-9-_]+)%.([A-Za-z0-9-_]+))%.([A-Za-z0-9-_]+)$"
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
25 local function verify(key, blob)
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
26 local signed, bheader, bpayload, signature = string.match(blob, jwt_pattern);
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
27 if not signed then
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
28 return nil, "invalid-encoding";
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
29 end
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
30 local header = json.decode(unb64url(bheader));
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
31 if not header or type(header) ~= "table" then
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
32 return nil, "invalid-header";
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
33 elseif header.alg ~= "HS256" then
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
34 return nil, "unsupported-algorithm";
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
35 end
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
36 if b64url(hashes.hmac_sha256(key, signed)) ~= signature then
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
37 return false, "signature-mismatch";
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
38 end
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
39 local payload, err = json.decode(unb64url(bpayload));
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
40 if err ~= nil then
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
41 return nil, "json-decode-error";
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
42 end
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
43 return true, payload;
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
44 end
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
45
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
46 return {
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
47 sign = sign;
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
48 verify = verify;
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
49 };
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
50