Book Image

ASP.NET Core 5 Secure Coding Cookbook

By : Roman Canlas
Book Image

ASP.NET Core 5 Secure Coding Cookbook

By: Roman Canlas

Overview of this book

ASP.NET Core developers are often presented with security test results showing the vulnerabilities found in their web apps. While the report may provide some high-level fix suggestions, it does not specify the exact steps that you need to take to resolve or fix weaknesses discovered by these tests. In ASP.NET Secure Coding Cookbook, you’ll start by learning the fundamental concepts of secure coding and then gradually progress to identifying common web app vulnerabilities in code. As you progress, you’ll cover recipes for fixing security misconfigurations in ASP.NET Core web apps. The book further demonstrates how you can resolve different types of Cross-Site Scripting. A dedicated section also takes you through fixing miscellaneous vulnerabilities that are no longer in the OWASP Top 10 list. This book features a recipe-style format, with each recipe containing sample unsecure code that presents the problem and corresponding solutions to eliminate the security bug. You’ll be able to follow along with each step of the exercise and use the accompanying sample ASP.NET Core solution to practice writing secure code. By the end of this book, you’ll be able to identify unsecure code causing different security flaws in ASP.NET Core web apps and you’ll have gained hands-on experience in removing vulnerabilities and security defects from your code.
Table of Contents (15 chapters)

Output encoding using UrlEncoder

URL encoding converts characters in the output into ASCII format. It also replaces unsafe characters with a % character as a prefix and then adds two hexadecimal digits.

Here's a partial list of characters and their URL-encoded equivalents:

Table 1.2 – Percent encoded characters and their equivalents

Table 1.2 – Percent encoded characters and their equivalents

In this recipe, you will learn how to use UrlEncoder to escape URLs.

Getting ready

Using Visual Studio Code, open the sample Online Banking app folder at \Chapter01\output-encoding-url\before\OnlineBankingApp.

How to do it…

Let's take a look at the steps for this recipe:

  1. Launch Visual Studio Code and open the starting exercise folder by typing the following command:
    code .
  2. Open the Pages\FundTransfers\Index.cshtml file and add an @inject directive to the Razor page to inject the UrlEncoder service:
    @inject System.Text.Encodings.Web.UrlEncoder urlEncoder
  3. Replace the markup...