blob: 7c36bbf3426e554f81d693d3e1c923b8855d9248 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
# frozen_string_literal: true
module Gitlab
module JwtAuthenticatable
# Supposedly the effective key size for HMAC-SHA256 is 256 bits, i.e. 32
# bytes https://www.rfc-editor.org/rfc/rfc4868#section-2.6
SECRET_LENGTH = 32
def self.included(base)
base.extend(ClassMethods)
end
module ClassMethods
include Gitlab::Utils::StrongMemoize
def decode_jwt(encoded_message, jwt_secret = secret, issuer: nil, iat_after: nil)
options = { algorithm: 'HS256' }
options = options.merge(iss: issuer, verify_iss: true) if issuer.present?
options = options.merge(verify_iat: true) if iat_after.present?
decoded_message = JWT.decode(encoded_message, jwt_secret, true, options)
payload = decoded_message[0]
if iat_after.present?
raise JWT::DecodeError, "JWT iat claim is missing" if payload['iat'].blank?
iat = payload['iat'].to_i
raise JWT::ExpiredSignature, 'Token has expired' if iat < iat_after.to_i
end
decoded_message
end
def secret
strong_memoize(:secret) do
read_secret(secret_path)
end
end
def read_secret(path)
Base64.strict_decode64(File.read(path).chomp).tap do |bytes|
raise "#{path} does not contain #{SECRET_LENGTH} bytes" if bytes.length != SECRET_LENGTH
end
end
def write_secret(path = secret_path)
bytes = SecureRandom.random_bytes(SECRET_LENGTH)
File.open(path, 'w:BINARY', 0600) do |f|
f.chmod(0600) # If the file already existed, the '0600' passed to 'open' above was a no-op.
f.write(Base64.strict_encode64(bytes))
end
end
end
end
end
|
