C#•2mo ago

Identity framework yay or nay?

I am building a local password manger (for a local server). It's meant to be used by 1 user so one account. It should only have a master password. Does it make sense to use identity framework for that?

22 Replies

Pobiega•2mo ago

No Identity would be a pretty big overkill if you explicitly just want a single user, and no roles, claims etc

Strax•2mo ago

I don't mind going overkill if its overkill in terms of security but if it doesn't provide more security then it is pointless :franksinatra: speaking of security where do I keep my master password?

The Fog from Human Resources•2mo ago

you dont :thinker:

Strax•2mo ago

:catthinking: like it will be hashed and salted and stuff

Jimmacle•2mo ago

it would be overkill in terms of features and complexity i mean, you can use it but you'd only be using a tiny piece of it

Strax•2mo ago

:misty: Just a master password is easier

Jimmacle•2mo ago

probably you can implement the exact same amount of security that identity does (PBKDF2-HMAC-SHA256 iirc) separately i actually already extracted the password hashing/verification, lemme find it

Strax•2mo ago

:peepoNoted: Sounds interesting I hope it's not too complicated to implement

Jimmacle•2mo ago

    private const int SaltSize = 128 / 8;
    private const int HashSize = 256 / 8;
    private const KeyDerivationPrf Prf = KeyDerivationPrf.HMACSHA512;
    private const int Iterations = 100000;

    private static byte[] HashToken(string token)
    {
        var salt = RandomNumberGenerator.GetBytes(SaltSize);
        var subkey = KeyDerivation.Pbkdf2(token, salt, Prf, Iterations, HashSize);
        byte[] outputBytes = [..salt, ..subkey];
        return outputBytes;
    }

    private static bool VerifyToken(string token, byte[] tokenHash)
    {
        var salt = tokenHash[..SaltSize];
        var subkey = tokenHash[SaltSize..];
        var testSubkey = KeyDerivation.Pbkdf2(token, salt, Prf, Iterations, HashSize);
        return CryptographicOperations.FixedTimeEquals(subkey, testSubkey);
    }

    private const int SaltSize = 128 / 8;
    private const int HashSize = 256 / 8;
    private const KeyDerivationPrf Prf = KeyDerivationPrf.HMACSHA512;
    private const int Iterations = 100000;

    private static byte[] HashToken(string token)
    {
        var salt = RandomNumberGenerator.GetBytes(SaltSize);
        var subkey = KeyDerivation.Pbkdf2(token, salt, Prf, Iterations, HashSize);
        byte[] outputBytes = [..salt, ..subkey];
        return outputBytes;
    }

    private static bool VerifyToken(string token, byte[] tokenHash)
    {
        var salt = tokenHash[..SaltSize];
        var subkey = tokenHash[SaltSize..];
        var testSubkey = KeyDerivation.Pbkdf2(token, salt, Prf, Iterations, HashSize);
        return CryptographicOperations.FixedTimeEquals(subkey, testSubkey);
    }

Strax•2mo ago

Damn one class

Jimmacle•2mo ago

that's the bare minimum to hash and verify passwords the same way identity does

Strax•2mo ago

Cool

Jimmacle•2mo ago

it might depend on some asp.net core library

Strax•2mo ago

Random and stuff yep Well thank you I'll work on it tomorrow Ill also need to use it as like authentication To block the access to the api if you're not logged in :misty:

Pobiega•2mo ago

You can very easily apply a middleware or your own actionfilter much like [Authorize] that handles it

Strax•2mo ago

Authorise is library? Or A tag for the end point

Pobiega•2mo ago

its an attribute you can stick on endpoints or controllers

Strax•2mo ago

Like [required] And how do I configure what authorize checks for?

Pobiega•2mo ago

It uses the built in authorization system that identity also uses. You could make your own authenticationschema that would work with it, but it might be simpler to just make up your own thing This is kinda what I meant with that identity is overkill here, you are trying to force a much more complicated system to do what is actually very simple

Strax•2mo ago

Well if I didn't use the identity How do I lock my endpoints behind a master password? 🤔I'll figure it out

Pobiega•2mo ago

create a login endpoint if the user gives the correct password, set a cookie look for that cookie in protected endpoints you can extract that behaviour to a middleware or actionfilter and it would behave much like [Authorize]

Strax•2mo ago

Cool :blobthumbsup: thanks for the help

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Identity framework yay or nay?