Is AntiXSS JavaScriptEncode subjected to HTML encoding?

Question

Is AntiXSS JavaScriptEncode subjected to HTML encoding?

I have recently implemented AntiXSS (4.3.0) into my project, primarily to utilize @Encoder.JavaScriptEncode as outlined in this resource.

After installing AntiXSS via Nuget, I added

encoderType="Microsoft.Security.Application.AntiXssEncoder, AntiXssLibrary"

to <httpRuntime in the Web.config file.

Within my view file, I included the following line (enclosed with <script> tags):

var userId = @Encoder.JavaScriptEncode(User.Identity.GetUserId());

I was expecting the output to be:

var userId = 'user-id';

However, it actually displays as:

var userId = &#39;user-id&#39;;

I suspect that this discrepancy is due to Razor attempting to sanitize the HTML, resulting in the single quotes being encoded as '.

The proposed solution would be to encapsulate it in Html.Raw(), although the guide I referenced did not mention that approach (instead opting to enclose the entire segment within single quotes in the JavaScript).

My question is - should I be required to use

@Html.Raw(Encoder.JavaScriptEncode(data))

, or is there an issue with my configuration?

Thank you!

c#javascript asp.net asp.net-mvc-4 antixsslibrary

Answer 1

Answer №1

Your understanding regarding razor encoding is accurate. I would also agree with the article you referenced, although I haven't read it in its entirety.

Instead of

var userId = @Encoder.JavaScriptEncode(User.Identity.GetUserId());

consider using

var userId = '@Encoder.JavaScriptEncode(User.Identity.GetUserId(), emitQuotes: false)';
//you can add '' if needed to represent userId as a string

or simply

var userId = @Encoder.JavaScriptEncode(User.Identity.GetUserId(), emitQuotes: false);
// You might see a syntax error highlighted by Visual Studio after the semi-colon.
// If the userId is a number based on your example, quotes are not necessary

alternatively, utilize Html.Raw() like so

var userId = Html.Raw(@Encoder.JavaScriptEncode(User.Identity.GetUserId());

Personal opinion: I prefer using emitQuotes: false because it provides that option and eliminates the need for an additional function call Html.Raw(). By default, emitQuotes is set to true. Did you intentionally omit the emitQuotes parameter?

Answer 2

Your understanding regarding razor encoding is accurate. I would also agree with the article you referenced, although I haven't read it in its entirety.

Instead of

var userId = @Encoder.JavaScriptEncode(User.Identity.GetUserId());

consider using

var userId = '@Encoder.JavaScriptEncode(User.Identity.GetUserId(), emitQuotes: false)';
//you can add '' if needed to represent userId as a string

or simply

var userId = @Encoder.JavaScriptEncode(User.Identity.GetUserId(), emitQuotes: false);
// You might see a syntax error highlighted by Visual Studio after the semi-colon.
// If the userId is a number based on your example, quotes are not necessary

alternatively, utilize Html.Raw() like so

var userId = Html.Raw(@Encoder.JavaScriptEncode(User.Identity.GetUserId());

Personal opinion: I prefer using emitQuotes: false because it provides that option and eliminates the need for an additional function call Html.Raw(). By default, emitQuotes is set to true. Did you intentionally omit the emitQuotes parameter?

Is AntiXSS JavaScriptEncode subjected to HTML encoding?

Answer №1

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