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Showing content from https://docs.microsoft.com/en-us/dotnet/fundamentals/code-analysis/quality-rules/ca5381 below:

CA5381: Ensure certificates are not added to root store (code analysis) - .NET

Adding certificates to the operating system's trusted root certificates increases the risk of legitimizing untrusted certification authority.

By default, this rule analyzes the entire codebase, but this is configurable.

This rule detects code that potentially adds a certificate into the Trusted Root Certification Authorities certificate store. By default, the Trusted Root Certification Authorities certificate store is configured with a set of public certification authorities (CAs) that has met the requirements of the Microsoft Root Certificate Program. Since all trusted root CAs can issue certificates for any domain, an attacker can pick a weak or coercible CA that you install by yourself to target for an attack – and a single vulnerable, malicious or coercible CA undermines the security of the entire system.

Do not install certificates into the Trusted Root Certification Authorities certificate store.

It is not recommended to suppress this rule.

Use the following options to configure which parts of your codebase to run this rule on.

• Exclude specific symbols
• Exclude specific types and their derived types

You can configure these options for just this rule, for all rules they apply to, or for all rules in this category (Security) that they apply to. For more information, see Code quality rule configuration options.

You can exclude specific symbols, such as types and methods, from analysis by setting the excluded_symbol_names option. For example, to specify that the rule should not run on any code within types named MyType, add the following key-value pair to an .editorconfig file in your project:

dotnet_code_quality.CAXXXX.excluded_symbol_names = MyType

Note

Replace the XXXX part of CAXXXX with the ID of the applicable rule.

Allowed symbol name formats in the option value (separated by |):

• Symbol name only (includes all symbols with the name, regardless of the containing type or namespace).
• Fully qualified names in the symbol's documentation ID format. Each symbol name requires a symbol-kind prefix, such as M: for methods, T: for types, and N: for namespaces.
• .ctor for constructors and .cctor for static constructors.

Examples:

You can exclude specific types and their derived types from analysis by setting the excluded_type_names_with_derived_types option. For example, to specify that the rule should not run on any methods within types named MyType and their derived types, add the following key-value pair to an .editorconfig file in your project:

dotnet_code_quality.CAXXXX.excluded_type_names_with_derived_types = MyType

Note

Replace the XXXX part of CAXXXX with the ID of the applicable rule.

Allowed symbol name formats in the option value (separated by |):

• Type name only (includes all types with the name, regardless of the containing type or namespace).
• Fully qualified names in the symbol's documentation ID format, with an optional T: prefix.

Examples:

The following pseudo-code sample illustrates the pattern detected by this rule.

using System;
using System.Security.Cryptography.X509Certificates;

class TestClass
{
    public void TestMethod()
    {
        var storeName = StoreName.Root;
        Random r = new Random();

        if (r.Next(6) == 4)
        {
            storeName = StoreName.My;
        }

        var x509Store = new X509Store(storeName);
        x509Store.Add(new X509Certificate2());
    }
}

using System.Security.Cryptography.X509Certificates;

class TestClass
{
    public void TestMethod()
    {
        var storeName = StoreName.My;
        var x509Store = new X509Store(storeName);
        x509Store.Add(new X509Certificate2());
    }
}

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