Skip to main content

Building WIF enabled .NET 4 Web applications: Potentially dangerous request

When integrating Windows Identity Foundation in your web applications probably one of the first errors you will see is the following:

RequestError

In the description of the error is stated that you can solve the error by adding the following configuration to your web.config:

<httpRuntime requestValidationMode="2.0" />

This solves the issue indeed but reverts the validation mode back to the ASP.NET 2.0 version. A better solution is to create and register your own RequestValidator for WIF.

public class WIFRequestValidator : RequestValidator
{
protected override bool IsValidRequestString(HttpContext context, string value, RequestValidationSource requestValidationSource, string collectionKey, out int validationFailureIndex)
{
validationFailureIndex = 0;

if (requestValidationSource == RequestValidationSource.Form && collectionKey.Equals(WSFederationConstants.Parameters.Result, StringComparison.Ordinal))
{
SignInResponseMessage message = WSFederationMessage.CreateFromFormPost(context.Request) as SignInResponseMessage;

if (message != null)
{
return true;
}
}

return base.IsValidRequestString(context, value, requestValidationSource, collectionKey, out validationFailureIndex);
}

}

You can then register the WIFRequestValidator in the web.config:

<httpRuntime requestValidationType="SampleApp.Security.WIFRequestValidator,SampleApp"/>

Popular posts from this blog

DevToys–A swiss army knife for developers

As a developer there are a lot of small tasks you need to do as part of your coding, debugging and testing activities.  DevToys is an offline windows app that tries to help you with these tasks. Instead of using different websites you get a fully offline experience offering help for a large list of tasks. Many tools are available. Here is the current list: Converters JSON <> YAML Timestamp Number Base Cron Parser Encoders / Decoders HTML URL Base64 Text & Image GZip JWT Decoder Formatters JSON SQL XML Generators Hash (MD5, SHA1, SHA256, SHA512) UUID 1 and 4 Lorem Ipsum Checksum Text Escape / Unescape Inspector & Case Converter Regex Tester Text Comparer XML Validator Markdown Preview Graphic Color B

Help! I accidently enabled HSTS–on localhost

I ran into an issue after accidently enabling HSTS for a website on localhost. This was not an issue for the original website that was running in IIS and had a certificate configured. But when I tried to run an Angular app a little bit later on http://localhost:4200 the browser redirected me immediately to https://localhost . Whoops! That was not what I wanted in this case. To fix it, you need to go the network settings of your browser, there are available at: chrome://net-internals/#hsts edge://net-internals/#hsts brave://net-internals/#hsts Enter ‘localhost’ in the domain textbox under the Delete domain security policies section and hit Delete . That should do the trick…

Azure DevOps/ GitHub emoji

I’m really bad at remembering emoji’s. So here is cheat sheet with all emoji’s that can be used in tools that support the github emoji markdown markup: All credits go to rcaviers who created this list.