C#•16mo ago

❔ JWT Storage location

Hi I'd like to ask where JWTs should be stored, my backend returns a JWT through the API and also sets an http-only cookie, but I'm not sure what to do with this from the front end as ASP requires an Authorization header and http only cookies can't be accessed from the front-end any ideas? This is for most part what I do

        NumixAuthenticated jwtToken = _authenticatorService.GenerateToken(jwtUser);
        string jwtTokenJson = JsonSerializer.Serialize(jwtToken, JsonHelper.JsonSerializerOptions);
        
        var options = new CookieOptions
        {
            HttpOnly = true, 
        };
    
        Response.Cookies.Append("Numix", jwtTokenJson, options);

        return Ok(jwtTokenJson);

        NumixAuthenticated jwtToken = _authenticatorService.GenerateToken(jwtUser);
        string jwtTokenJson = JsonSerializer.Serialize(jwtToken, JsonHelper.JsonSerializerOptions);
        
        var options = new CookieOptions
        {
            HttpOnly = true, 
        };
    
        Response.Cookies.Append("Numix", jwtTokenJson, options);

        return Ok(jwtTokenJson);

13 Replies

Angius•16mo ago

A JWT token should be stored in a HTTP-only cookie And authorization should be done via that cookie Not via headers or anything else

S-IERRAOP•16mo ago

Doesn't this take in the header "Authorization" ?

JakenVeina•16mo ago

no that instructs MVC to require requests to the attached endpoint be authenticated by the authentication middleware it makes 0 assumptions about how that authentication is performed, that's the job of the authentication middleware there is no "correct" way to store a JWT cookies are nice, because they actually eliminate the need to store the tokens, in a sense

S-IERRAOP•16mo ago

So I should store it as a Http Only cookie, create a authentication middleware that fetches that cookie and validates it?

JakenVeina•16mo ago

using cookie-based auth exclusively leaves you vulnerabule to CSRF attacks, without separate mitigation it also kinda limits you to browser-based clients that is a valid implementation, yes

Angius•16mo ago

The existing middleware should just work, should it not? Just use the .UseJwt() or whatever it's called

JakenVeina•16mo ago

the auth middleware for using JWTs is much less straightforward than it should be but yes, you would not "create a authentication middleware" you would assemble and configure the various components of the ASP.NET Authentication middleware to do what you want

S-IERRAOP•16mo ago

Makes sense also seems a lot more straightforward, any idea what I’d have to configure so it uses the specific cookie as the value it should validate

JakenVeina•16mo ago

IIRC, the default JWT scheme uses the "Authentication: Bearer" delivery mechanism, so if you want to use a cookie, you'll have to inject some custom logic to extract the token, probably through a RequestReceived event handler

S-IERRAOP•16mo ago

https://stackoverflow.com/questions/52184431/in-asp-net-core-read-jwt-token-from-cookie-instead-of-headers

Stack Overflow

In ASP.NET Core read JWT token from Cookie instead of Headers

I am porting an ASP.NET Web API 4.6 OWIN application to ASP.NET Core 2.1. The application is working based on JWT token. But the token in passed via cookie instead of header. I'm not sure why heade...

S-IERRAOP•16mo ago

seems about right Got it working through cookies, ty ! @jakenveina @angius

Angius•16mo ago

Nice

Accord•16mo ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ JWT Storage location