rspec/rules/S2076/csharp/rule.adoc

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== Noncompliant Code Example

----
using System.Diagnostics;
using Microsoft.AspNetCore.Mvc;

namespace WebApplicationDotNetCore.Controllers
{
    public class RSPEC2076OSCommandInjectionNoncompliantController : Controller
    {
        public IActionResult Index()
        {
            return View();
        }

        public IActionResult Run(string binary)
        {
            // If the value "/sbin/shutdown" is passed as binary and the web server is running as root,
            // then the machine running the web server will be shut down and become unavailable for future requests

            Process p = new Process();
            p.StartInfo.FileName = binary; // Noncompliant
            p.StartInfo.RedirectStandardOutput = true;
            p.Start();
            string output = p.StandardOutput.ReadToEnd();
            p.Dispose();

            return View();
        }
    }
}
----

== Compliant Solution

----
using System.Diagnostics;
using System.Text.RegularExpressions;
using Microsoft.AspNetCore.Mvc;

namespace WebApplicationDotNetCore.Controllers
{
    public class RSPEC2076OSCommandInjectionCompliantControllerController : Controller
    {
        public IActionResult Index()
        {
            return View();
        }

        public IActionResult Run(string binary)
        {
            if (binary.Equals("/usr/bin/ls") || binary.Equals("/usr/bin/cat"))
            {
               // only ls and cat commands are authorized

              Process p = new Process();
              p.StartInfo.FileName = binary; // Compliant
              p.StartInfo.RedirectStandardOutput = true;
              p.Start();
              string output = p.StandardOutput.ReadToEnd();
              p.Dispose();
            }

            return View();
        }
    }
}
----

include::../see.adoc[]

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== Comments And Links
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include::../comments-and-links.adoc[]
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