Detect SSRF Attacks in HTML Text in C#

Malicious users are spending more time crafting customized attacks, which is bad news for online applications who rely on firewalls and anti-virus software to catch the majority of threats. Attackers can search site and database structures for vulnerabilities and exploit them in a variety of ways; one popular method is via server-side request forgery (SSRF) attacks. If server side input validations are missing, this provides an opportunity for a user to inject arbitrary HTML code, execute it on the server, and obtain access to sensitive data. However, by using the following API in C#, you can detect SSRF attacks from HTML text input and avoid this unsafe situation.

Our first step is to install the .NET Framework by running this command:

Install-Package Cloudmersive.APIClient.NET.Validate -Version 3.2.0

After the installation, we can add the user-facing text input and call the function with the following code:

using System;
using System.Diagnostics;
using Cloudmersive.APIClient.NET.Validate.Api;
using Cloudmersive.APIClient.NET.Validate.Client;
using Cloudmersive.APIClient.NET.Validate.Model;
namespace Example
{
    public class TextInputCheckHtmlSsrfExample
    {
        public void main()
        {
            // Configure API key authorization: Apikey
            Configuration.Default.AddApiKey("Apikey", "YOUR_API_KEY");
var apiInstance = new TextInputApi();
            var value = value_example;  // string | User-facing HTML input.
try
            {
                // Protect html input from Server-side Request Forgery (SSRF) attacks
                HtmlSsrfDetectionResult result = apiInstance.TextInputCheckHtmlSsrf(value);
                Debug.WriteLine(result);
            }
            catch (Exception e)
            {
                Debug.Print("Exception when calling TextInputApi.TextInputCheckHtmlSsrf: " + e.Message );
            }
        }
    }
}

To retrieve an API key, visit the Cloudmersive website to register for a free account; this will give you access to 800 calls/month across our entire library of APIs.