71 lines
2.6 KiB
Plaintext
71 lines
2.6 KiB
Plaintext
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=== Code examples
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:BinaryFormatter: https://learn.microsoft.com/en-us/dotnet/api/system.runtime.serialization.formatters.binary.binaryformatter
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:NetDataContractSerializer: https://learn.microsoft.com/en-us/dotnet/api/system.runtime.serialization.netdatacontractserializer
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:SoapFormatter: https://learn.microsoft.com/en-us/dotnet/api/system.runtime.serialization.formatters.soap.soapformatter
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:JavaScriptSerializer: https://learn.microsoft.com/en-us/dotnet/api/system.web.script.serialization.javascriptserializer
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==== Noncompliant code example
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With {BinaryFormatter}[``BinaryFormatter``], {NetDataContractSerializer}[``NetDataContractSerializer``] or {SoapFormatter}[``SoapFormatter``]:
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[source,vbnet,diff-id=201,diff-type=noncompliant]
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----
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Dim myBinaryFormatter = New BinaryFormatter()
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myBinaryFormatter.Deserialize(stream) ' Noncompliant
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----
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With {JavaScriptSerializer}[``JavaScriptSerializer``]:
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[source,vbnet,diff-id=202,diff-type=noncompliant]
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----
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Dim serializer1 As JavaScriptSerializer = New JavaScriptSerializer(New SimpleTypeResolver()) ' Noncompliant: SimpleTypeResolver is insecure (every type is resolved)
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serializer1.Deserialize(Of ExpectedType)(json)
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----
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==== Compliant solution
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With {BinaryFormatter}[``BinaryFormatter``], {NetDataContractSerializer}[``NetDataContractSerializer``] or {SoapFormatter}[``SoapFormatter``]:
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[source,vbnet,diff-id=201,diff-type=compliant]
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----
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NotInheritable Class CustomBinder
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Inherits SerializationBinder
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Public Overrides Function BindToType(assemblyName As String, typeName As String) As Type
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If Not (Equals(typeName, "type1") OrElse Equals(typeName, "type2") OrElse Equals(typeName, "type3")) Then
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Throw New SerializationException("Only type1, type2 and type3 are allowed")
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End If
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Return Assembly.Load(assemblyName).[GetType](typeName)
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End Function
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End Class
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Dim myBinaryFormatter = New BinaryFormatter()
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myBinaryFormatter.Binder = New CustomBinder()
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myBinaryFormatter.Deserialize(stream)
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----
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With {JavaScriptSerializer}[``JavaScriptSerializer``]:
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[source,vbnet,diff-id=202,diff-type=compliant]
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----
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Public Class CustomSafeTypeResolver
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Inherits JavaScriptTypeResolver
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Public Overrides Function ResolveType(id As String) As Type
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If Not Equals(id, "ExpectedType") Then
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Throw New ArgumentNullException("Only ExpectedType is allowed during deserialization")
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End If
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Return Type.[GetType](id)
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End Function
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End Class
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Dim serializer As JavaScriptSerializer = New JavaScriptSerializer(New CustomSafeTypeResolver())
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serializer.Deserialize(Of ExpectedType)(json)
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----
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=== Going the extra mile
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include::../../common/extra-mile/formatters.adoc[]
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