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Showing content from https://docs.microsoft.com/en-us/dotnet/fundamentals/code-analysis/quality-rules/ca2322 below:

CA2322: Ensure JavaScriptSerializer is not initialized with SimpleTypeResolver before deserializing (code analysis) - .NET

A System.Web.Script.Serialization.JavaScriptSerializer deserialization method was called or referenced and the JavaScriptSerializer may have been initialized with a System.Web.Script.Serialization.SimpleTypeResolver.

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

Insecure deserializers are vulnerable when deserializing untrusted data. An attacker could modify the serialized data to include unexpected types to inject objects with malicious side effects. An attack against an insecure deserializer could, for example, execute commands on the underlying operating system, communicate over the network, or delete files.

This rule finds System.Web.Script.Serialization.JavaScriptSerializer deserialization method calls or references, when the JavaScriptSerializer may have been initialized with a System.Web.Script.Serialization.SimpleTypeResolver.

• Ensure JavaScriptTypeResolver objects aren't initialized with a System.Web.Script.Serialization.SimpleTypeResolver.
• If your code needs to read data serialized using a SimpleTypeResolver, restrict deserialized types to an expected list by implementing a custom JavaScriptTypeResolver.
• Make the serialized data tamper-proof. After serialization, cryptographically sign the serialized data. Before deserialization, validate the cryptographic signature. Protect the cryptographic key from being disclosed and design for key rotations.

It's safe to suppress a warning from this rule if:

• You know the input is trusted. Consider that your application's trust boundary and data flows may change over time.
• You've taken one of the precautions in How to fix violations.

If you just want to suppress a single violation, add preprocessor directives to your source file to disable and then re-enable the rule.

#pragma warning disable CA2322
// The code that's violating the rule is on this line.
#pragma warning restore CA2322

To disable the rule for a file, folder, or project, set its severity to none in the configuration file.

[*.{cs,vb}]
dotnet_diagnostic.CA2322.severity = none

For more information, see How to suppress code analysis warnings.

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:

using System.Web.Script.Serialization;

public class ExampleClass
{
    public JavaScriptSerializer Serializer { get; set; }

    public T Deserialize<T>(string str)
    {
        return this.Serializer.Deserialize<T>(str);
    }
}

Imports System.Web.Script.Serialization

Public Class ExampleClass
    Public Property Serializer As JavaScriptSerializer

    Public Function Deserialize(Of T)(str As String) As T
        Return Me.Serializer.Deserialize(Of T)(str)
    End Function
End Class

using System.Web.Script.Serialization;

public class ExampleClass
{
    public T Deserialize<T>(string str)
    {
        JavaScriptSerializer s = new JavaScriptSerializer();
        return s.Deserialize<T>(str);
    }
}

Imports System.Web.Script.Serialization

Public Class ExampleClass
    Public Function Deserialize(Of T)(str As String) As T
        Dim s As JavaScriptSerializer = New JavaScriptSerializer()
        Return s.Deserialize(Of T)(str)
    End Function
End Class

using System.Web.Script.Serialization;

public class BookRecord
{
    public string Title { get; set; }
    public string Author { get; set; }
    public int PageCount { get; set; }
    public AisleLocation Location { get; set; }
}

public class AisleLocation
{
    public char Aisle { get; set; }
    public byte Shelf { get; set; }
}

public class ExampleClass
{
    public JavaScriptSerializer Serializer { get; set; }

    public BookRecord DeserializeBookRecord(string s)
    {
        return this.Serializer.Deserialize<BookRecord>(s);
    }
}

Imports System.Web.Script.Serialization

Public Class BookRecord
    Public Property Title As String
    Public Property Author As String
    Public Property Location As AisleLocation
End Class

Public Class AisleLocation
    Public Property Aisle As Char
    Public Property Shelf As Byte
End Class

Public Class ExampleClass
    Public Property Serializer As JavaScriptSerializer

    Public Function DeserializeBookRecord(str As String) As BookRecord
        Return Me.Serializer.Deserialize(Of BookRecord)(str)
    End Function
End Class

using System;
using System.Web.Script.Serialization;

public class BookRecordTypeResolver : JavaScriptTypeResolver
{
    // For compatibility with data serialized with a JavaScriptSerializer initialized with SimpleTypeResolver.
    private static readonly SimpleTypeResolver Simple = new SimpleTypeResolver();

    public override Type ResolveType(string id)
    {
        // One way to discover expected types is through testing deserialization
        // of **valid** data and logging the types used.

        ////Console.WriteLine($"ResolveType('{id}')");

        if (id == typeof(BookRecord).AssemblyQualifiedName || id == typeof(AisleLocation).AssemblyQualifiedName)
        {
            return Simple.ResolveType(id);
        }
        else
        {
            throw new ArgumentException("Unexpected type ID", nameof(id));
        }
    }

    public override string ResolveTypeId(Type type)
    {
        return Simple.ResolveTypeId(type);
    }
}

public class BookRecord
{
    public string Title { get; set; }
    public string Author { get; set; }
    public int PageCount { get; set; }
    public AisleLocation Location { get; set; }
}

public class AisleLocation
{
    public char Aisle { get; set; }
    public byte Shelf { get; set; }
}

public class ExampleClass
{
    public BookRecord DeserializeBookRecord(string s)
    {
        JavaScriptSerializer serializer = new JavaScriptSerializer(new BookRecordTypeResolver());
        return serializer.Deserialize<BookRecord>(s);
    }
}

Imports System
Imports System.Web.Script.Serialization

Public Class BookRecordTypeResolver
    Inherits JavaScriptTypeResolver

    ' For compatibility with data serialized with a JavaScriptSerializer initialized with SimpleTypeResolver.
    Private Dim Simple As SimpleTypeResolver = New SimpleTypeResolver()

    Public Overrides Function ResolveType(id As String) As Type
        ' One way to discover expected types is through testing deserialization
        ' of **valid** data and logging the types used.

        ''Console.WriteLine($"ResolveType('{id}')")

        If id = GetType(BookRecord).AssemblyQualifiedName Or id = GetType(AisleLocation).AssemblyQualifiedName Then
            Return Simple.ResolveType(id)
        Else
            Throw New ArgumentException("Unexpected type", NameOf(id))
        End If
    End Function

    Public Overrides Function ResolveTypeId(type As Type) As String
        Return Simple.ResolveTypeId(type)
    End Function
End Class

Public Class BookRecord
    Public Property Title As String
    Public Property Author As String
    Public Property Location As AisleLocation
End Class

Public Class AisleLocation
    Public Property Aisle As Char
    Public Property Shelf As Byte
End Class

Public Class ExampleClass
    Public Function DeserializeBookRecord(str As String) As BookRecord
        Dim serializer As JavaScriptSerializer = New JavaScriptSerializer(New BookRecordTypeResolver())
        Return serializer.Deserialize(Of BookRecord)(str)
    End Function
End Class

CA2321: Do not deserialize with JavaScriptSerializer using a SimpleTypeResolver

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