Half a years price of pull requests with nice options have lastly been baked into an official launch of Kentor.AuthServices which is now obtainable on Nuget. The most vital fixes are improved energetic/passive dealing with for the Owin middleware and full assist for SHA256/384/512 as it’s time to depart SHA1.

First of all I would really like thank all contributors and customers which have needed to look ahead to this whereas I’ve been on parental depart. A particular because of Explunit who has made a number of useful contributions in addition to reviewing pull requests and brought half in design discussions.

The public API of AuthServices is getting an increasing number of secure, however however there are some breaking modifications.

  • The Owin Middleware is now as soon as once more Passive by default
  • The Owin Middleware will act as Active throughout Logout, even whether it is configured as passive. This may be disabled with the StrictOwinAuthenticationMode compatibility setting.
  • On .NET 4.6.2 and later AuthServices now by default generates SHA256-based signatures and solely accepts SHA256 or stronger signatures.
  • The “intelligent” ReturnUrl enlargement has been eliminated because it proved to create extra issues than it solved.
  • ReturnUrl open redirect concern mounted.

An owin middleware may be configured both as passive or energetic. In energetic mode the middleware intercepts all requests and tries to authenticate them if wanted. In passive mode it doesn’t do something until explicitly invoked. Typically the one energetic middleware in an software is the session cookie middleware. All others which are used for exterior authentication are usually passive. This is how AuthServices used to work, till Single Logout assist was added. When Single Logout is used, the everyday state of affairs is that AuthServices ought to intercept logout of any SAML2-initiated periods, even when not explicitly invoked. Because of that, the Owin middleware was modified to be Active by default when Single Logout was added.

This turned out to create a number of points for the login performance although with loads of questions on the problem tracker that have been answered with “swap to passive”.

To treatment this, the Owin middleware is now as soon as once more passive by default. But behaves as energetic throughout logout. This hybrid strategy ought to work properly for many eventualities. If it doesn’t there’s a compatibility setting StrictOwinAuthenticationMode that can be utilized to modify it off.

Kentor.AuthServices has had assist for incoming SHA256 signatures for lengthy with the GlobalEnableSha256XmlSignatures() configuration technique. With .NET 4.6.2 that’s not required because the assist is now constructed into the framework. This signifies that AuthServices now has switched to producing SHA256 signatures by default when run on .NET 4.6.2. This contains the StubIdp the place this modification has been stay for a while already. The generated signature may be modified with the OutboundSigningAlgorithm possibility. A default may be set for all outbound messages (together with AuthServices’ metadata). It’s additionally potential to override for every Identity Provider.

There’s additionally a setting MinIncomingSigningAlgorithm that units the minimal accepted power for incoming messages. By default that’s set to SHA256 when run on .NET 4.6.2 and SHA1 in any other case.

There has been some enhancements to the dealing with of the ReturnUrl question string parameter used with SignalIn and Logout. Previously it has been doing som “intelligent” enlargement of the ReturnUrl, attempting to develop any relative Url into an absolute one. The intention with this was to permit redirects to work though the redirect is effected from one other path than the place it’s initiated. An instance: With the owin middleware in energetic mode an authentication is initiated from . The ReturnUrl is ready to LoggedIn. If a redirect is completed immediately from to LoggedIn it could be interpreted as https://example.com/Account/LoggedIn. But the precise redirect is effected in a request to so the redirect would find yourself at which doesn’t exist. We tried to be intelligent and deal with that. But when PublicOrigin is concerned with exterior termination of TLS periods this grew to become very difficult and error inclined. So we dropped it totally.

The ReturnUrl has additionally lacked validation, in impact creating an open redirect (which is a nasty factor, it’s #10 on OWASP Top 10 2013). This has now been mounted in order that the ReturnUrl is validated earlier than getting used. If redirects to a different area is required, there’s a Notification ValidateAbsoluteReturnUrl that can be utilized.

Finally, the Notifications system has been expanded to permit for customisation of much more of the behaviour. Going ahead we’ll attempt to preserve from including too many new ideas to the configuration system and as a substitute provide Notifications the place customized code may be hooked in.

Posted in
C#, Web on 2017-03-16 | Tagged Kentor.AuthServices

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