prosody
83d6d6a70edf
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 @ 11749:83d6d6a70edf

net.http: fail open if surrounding code does not configure TLS Previously, if surrounding code was not configuring the TLS context used default in net.http, it would not validate certificates at all. This is not a security issue with prosody, because prosody updates the context with `verify = "peer"` as well as paths to CA certificates in util.startup.init_http_client. Nevertheless... Let's not leave this pitfall out there in the open.
author Jonas Schäfer <jonas@wielicki.name>
date Sun, 29 Aug 2021 15:04:47 +0200
parent 11561:d2f33b8fdc96
child 12696:27a72982e331
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;
11561
d2f33b8fdc96 util.jwt: Use constant-time comparison with expected signature
Matthew Wild <mwild1@gmail.com>
parents: 10660
diff changeset
6 local secure_equals = require "util.hashes".equals;
10660
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
7
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
8 local b64url_rep = { ["+"] = "-", ["/"] = "_", ["="] = "", ["-"] = "+", ["_"] = "/" };
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
9 local function b64url(data)
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
10 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
11 end
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
12 local function unb64url(data)
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
13 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
14 end
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
15
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
16 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
17
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
18 local function sign(key, payload)
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
19 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
20 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
21 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
22 return signed .. "." .. b64url(signature);
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
23 end
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
24
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
25 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
26 local function verify(key, blob)
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
27 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
28 if not signed then
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
29 return nil, "invalid-encoding";
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
30 end
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
31 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
32 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
33 return nil, "invalid-header";
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
34 elseif header.alg ~= "HS256" then
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
35 return nil, "unsupported-algorithm";
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
36 end
11561
d2f33b8fdc96 util.jwt: Use constant-time comparison with expected signature
Matthew Wild <mwild1@gmail.com>
parents: 10660
diff changeset
37 if not secure_equals(b64url(hashes.hmac_sha256(key, signed)), signature) then
10660
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
38 return false, "signature-mismatch";
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
39 end
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
40 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
41 if err ~= nil then
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
42 return nil, "json-decode-error";
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
43 end
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
44 return true, payload;
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
45 end
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
46
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
47 return {
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
48 sign = sign;
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
49 verify = verify;
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
50 };
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
parents:
diff changeset
51