AngularJS Web Api AntiForgeryToken CSRF

AngularJS Web Api AntiForgeryToken CSRF

To prevent Cross-Site Request Forgery (CSRF) attacks in AngularJS Web API applications, you can use the AntiForgeryToken feature provided by ASP.NET Web API. Here are the steps to implement this feature:

  • Add the AntiForgeryToken to your ASP.NET Web API action method:
[HttpPost] [ValidateAntiForgeryToken] public IHttpActionResult PostData(MyModel model) { if (ModelState.IsValid) { // Process the data return Ok(); } else { return BadRequest(ModelState); } }

The [ValidateAntiForgeryToken] attribute ensures that the request contains a valid AntiForgeryToken that matches the one generated by the server.

  • Add the AntiForgeryToken to your AngularJS client:
app.config(function($httpProvider) { // Add the AntiForgeryToken to all requests $httpProvider.defaults.headers.common['X-XSRF-Token'] = $('input[name="__RequestVerificationToken"]').val(); });

This code retrieves the AntiForgeryToken value from a hidden input field on the page, and adds it to the X-XSRF-Token header of all requests made by AngularJS.

  • Add a hidden input field for the AntiForgeryToken to your HTML page:
<form> <input type="hidden" name="__RequestVerificationToken" value="@AntiForgery.GetHtml()" /> <!-- Other form fields --> <button type="submit">Submit</button> </form>

This code generates a hidden input field that contains the AntiForgeryToken value. The @AntiForgery.GetHtml() method is a helper method provided by ASP.NET that generates the HTML markup for the AntiForgeryToken.

By following these steps, you can protect your AngularJS Web API application from CSRF attacks. When a request is made to the server, the AntiForgeryToken is validated to ensure that the request was made from a trusted source. If the token is not valid, the server will reject the request and return an error.

Examples

  1. Web API Action Method with ValidateAntiForgeryToken Attribute:

    • "Web API action method ValidateAntiForgeryToken attribute"
    • Code:
      [ValidateAntiForgeryToken] public IHttpActionResult YourAction([FromBody] YourModel model) { // Your action logic }
      • Description: Secure a Web API action method by adding the ValidateAntiForgeryToken attribute to prevent CSRF attacks.

  2. AngularJS Controller Integration with AntiForgeryToken:

    • "AngularJS controller integration with AntiForgeryToken"
    • Code:
      $scope.getAntiForgeryToken = function () { // Implement logic to fetch AntiForgeryToken from server };
      • Description: Create an AngularJS controller method to fetch the AntiForgeryToken from the server.

  3. AngularJS Service for CSRF Token Retrieval:

    • "AngularJS service CSRF token retrieval"
    • Code:
      app.factory('csrfService', ['$http', function ($http) { return { getCsrfToken: function () { // Implement logic to fetch CSRF token from the server } }; }]);
      • Description: Develop an AngularJS service to encapsulate the logic for fetching the CSRF token.

  4. Ensuring CSRF Protection in AngularJS Forms:

    • "AngularJS form CSRF protection"
    • Code:
      <form ng-submit="submitForm()" csrf-token> <!-- Your form elements --> </form>
      • Description: Integrate CSRF protection into AngularJS forms using a custom directive (csrf-token).

  5. Handling CSRF Token in AngularJS $http Requests:

    • "AngularJS $http request CSRF token handling"
    • Code:
      $http({ method: 'POST', url: 'yourApiEndpoint', headers: { 'RequestVerificationToken': $scope.getAntiForgeryToken() }, data: yourData });
      • Description: Include the CSRF token in AngularJS $http requests by modifying the headers.

  6. Web API Action Method for CSRF Token Retrieval:

    • "Web API action method CSRF token retrieval"
    • Code:
      [HttpGet] public IHttpActionResult GetCsrfToken() { // Generate and return CSRF token }
      • Description: Implement a Web API action method dedicated to retrieving the CSRF token.

  7. Using AngularJS ngResource with CSRF Protection:

    • "AngularJS ngResource CSRF protection"
    • Code:
      var resource = $resource('yourApiEndpoint', {}, { save: { method: 'POST', headers: { 'RequestVerificationToken': $scope.getAntiForgeryToken() } } });
      • Description: Secure AngularJS ngResource requests with CSRF protection by setting custom headers.

  8. AngularJS Directive for CSRF Token Handling:

    • "AngularJS directive CSRF token handling"
    • Code:
      app.directive('csrfToken', ['$http', function ($http) { return { link: function (scope, element, attrs) { // Implement logic to handle CSRF token in directive } }; }]);
      • Description: Create an AngularJS directive to encapsulate the logic for handling the CSRF token.

  9. Ensuring CSRF Protection in Web API Responses:

    • "Web API response CSRF protection"
    • Code:
      public HttpResponseMessage YourAction() { // Your action logic var response = new HttpResponseMessage(HttpStatusCode.OK); response.Headers.Add("RequestVerificationToken", yourCsrfToken); return response; }
      • Description: Include the CSRF token in Web API responses to ensure consistency and facilitate client-side handling.

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