Redirecting the user to the central authentication service when the user is not logged in to request credentials and issue a new authentication token is the common scenario in Single Sign On systems using well-known protocols like oauth2 or OpenId Connect However when this schema is used across domains the main drawback is that the … Read more
As it turns out, my suspicions were right. The audience aud claim in a JWT is meant to refer to the Resource Servers that should accept the token. As this post simply puts it: The audience of a token is the intended recipient of the token. The audience value is a string — typically, the … Read more
As indicated here, the problem is actually in the signature generated by openSSL. Using ES256, the digital signature is the concatenation of two unsigned integers, denoted as R and S, which are the result of the Elliptic Curve (EC) algorithm. The length of R || S is 64. The openssl_sign function generates a signature which … Read more
When the whole output is { iat: 1561463667 }, it means, that no extra payload/claims were added when the token was signed. The jsonwebtoken package usually adds iat (issuedAt, the time when the token was issued) as a default claim. In simple words: you can only decode claims, that were added before. To add more … Read more
The library PyJWT has an option to decode a JWT without verification: Without this option, the decode function does not only decode the token but also verifies the signature and you would have to provide the matching key. And that’s of course the recommended way. But if you, for whatever reason, just want to decode … Read more
Yes, the refresh token is used to obtain a new access token. When you request the access token for the first time, you usually start by sending a token request to the token endpoint, in case of the so called Resource Owner Password Credentials Grant with user credentials in the request header, e.g. grant_type=password&username=user1&passowrd=very_secret when … Read more
JWT (RFC7519) is just a compact way to safely transmit claims from an issuer to the audience over HTTP. JWT can be: signed (JWS – RFC7515) encrypted (JWE – RFC7516) signed then encrypted (this order is highly recommended). The whole JWS is the payload of the JWE encrypted then signed. It makes sense to encrypt … Read more
I’ve also been trying to find this. I’d say – try and ensure it’s below 7kb. Whilst JWT defines no upper limit in the spec (http://www.rfc-editor.org/rfc/rfc7519.txt) we do have some operational limits. As a JWT is included in a HTTP header, we’ve an upper limit (SO: Maximum on http header values) of 8K on the … Read more
If you are using only a secret key then using RS256 won’t work, as it’s based on a private/public key pair. Using only a secret key usually indicates H256. In my answer I assume that what you call MYSECRET is just the content of certificate.pem. Anyways, I would assume your string has to contain —–BEGIN … Read more
The https://jwt.io debugger works in both directions, you can inspect and verify tokens or create and sign tokens. When you first paste your token on the left side and then paste the secret or key into the field under ‘verify signature’ in the right column, the signature will be recreated and you should notice that … Read more