The tool for working with JWT signed by multiple verificators as per RFC 7515. Using on the ruby gem «jwt» under the hood.
Home Page: https://www.rubykube.io
License: MIT License
Multi Sig payload is generated via payload.to_json in JWT::Multisig#generate_jwt however the JWT gem has JWT::Encode#encoded_payload which uses JSON.generate(@payload)
The result is a slightly different datetime string but therefore a different payload and therefore an error when attempting to verify the signature from the multisig jwt.
This can be illustrated in a rails console via ..
>> now = Time.now.utc
2018-09-04 06:42:42 UTC
>> {time: now}.to_json
"{\"time\":\"2018-09-04T06:42:42.337Z\"}"
>> JSON.generate({time: now})
"{\"time\":\"2018-09-04 06:42:42 UTC\"}"
.. noting the difference in the timestamps.
What is the solution?
Either change jwt-multisig gem to use JSON.generate or have the author of the https://github.com/jwt/ruby-jwt/blob/master/lib/jwt/encode.rb change code to use .to_json
When using with rails, I found it will have an error #<JWT::VerificationError: Signature verification raised> because jwt-multisig try to encode payload with not the same method when encoding signature.
Payload encoding relies on ActiveSupport::JSON.encode in rails ? which will escape HTML string in JSON body and it will not match to the signature which is not escaped. and also with DateTime as another issue #1
example payload raised an error
{
"test_html_1": "&",
"test_html_2": "<html string>",
"test_datetime": Time.now
}I think we have 2 solutions for this case
config.active_support.escape_html_entities_in_json = false in application.rb in rails. but it will affect the whole application (but still not fix for DateTime?).base64_encode(payload.to_json) to be JWT::Base64.url_encode(JWT::JSON.generate(payload)) (same as signature encoding) or using JSON.dump can solve the issue also but it will not the same as signature encoded.
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