Attribute in Visual Basic .NET

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With .NET 1.1 this is the default value. The default level permits deserialization of the following types: Remoting infrastructure objects necessary for doing basic remoting tasks Primitive types and reference and value types composed of only primitives Reference- and value-types that are marked as [Serializable] but don t implement ISerializable System-provided types that implement ISerializable but don t make further permission demands System-provided, serializable types in assemblies that are not marked with the APTCA1 attribute Custom types in strong-named assemblies that are not marked with APTCA Custom types that implement ISerializable without making further demands outside serialization Types that implement ILease but are not MarshalByRef objects ObjRef objects needed for activation of CAO, which can be deserialized on clients but not on servers The full setting allows deserialization of any remoted types sent across the wire. This means ObjRef objects passed as parameters, objects that implement ISponsor, as well as objects that are inserted between the proxy and client pipeline by the IContributeEnvoySink interface are supported in addition to supported types of the Low deserialization level.
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1. APTCA is the acronym for AllowPartiallyTrustedCallersAttribute. This attribute can be applied on strong-named assemblies so that they can be called from partially trusted code, which is not allowed by default.
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CHAPTER 4 CONFIGURATION AND DEPLOYMENT
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Concrete things like callbacks to clients through delegates and vice versa will not work by default when deploying .NET Remoting solutions with .NET 1.1. In this case, you have to configure the typeFilterLevel attribute to the full setting manually. This means threats mentioned previously are not mitigated any more, and you have to include strong authentication and encryption mechanisms for your .NET Remoting applications to mitigate the threats with other techniques. Security in .NET Remoting solutions is discussed in the next chapter. You can configure the typeFilterLevel either manually in code or through configuration files. The attribute itself is applied at the formatter level. This means a configuration file with the typeFilterLevel attribute configured might look like the following (the setting must be configured for each channel and each formatter): <configuration> <system.runtime.remoting> <application> <channels> <channel ref="tcp" port="1234"> <serverProviders> <formatter ref="binary" typeFilterLevel="Low" /> <formatter ref="soap" typeFilterLevel="Low" /> </serverProviders> </channel> </channels> <service> <wellknown type="Server.ServerImpl, Server" objectUri="MyServer.rem" mode="Singleton" /> </service> </application> </system.runtime.remoting> </configuration>
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Note The preceding configuration file shows the configuration of a remoting server. If you have to configure a client that needs to receive callbacks from the server through delegates, the client s channel receives those callbacks through its own receiving port. It acts as a server for the callbacks. Therefore, if the client wants to be able to receive callbacks, you have to include the <serverProviders> configuration tag for each channel configured in the client to set the typeFilterLevel property.
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If you want to configure the typeFilterLevel in code, you have to apply the setting on either the BinaryServerFormatterSinkProvider or the SoapServerFormatterSinkProvider through their generic property collection. The following code snippet demonstrates configuration through code:
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CHAPTER 4 CONFIGURATION AND DEPLOYMENT
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// configure the formatters for the channel BinaryServerFormatterSinkProvider formatterBin = new BinaryServerFormatterSinkProvider(); formatterBin.TypeFilterLevel = TypeFilterLevel.Full; SoapServerFormatterSinkProvider formatterSoap = new SoapServerFormatterSinkProvider(); formatterSoap.TypeFilterLevel = TypeFilterLevel.Low; formatterBin.Next = formatterSoap; // register the channels IDictionary dict = new Hashtable(); dict.Add("port", "1234"); TcpChannel channel = new TcpChannel(dict, null, formatterBin); ChannelServices.RegisterChannel(channel); // register the wellknown service RemotingConfiguration.RegisterWellKnownServiceType(typeof(ServerImpl), "MyServer.rem", WellKnownObjectMode.Singleton); The preceding code leads to the same configuration as the configuration file with the typeFilterLevel configured shown previously. But never forget that the typeFilterLevel is just one method for mitigating attacks. It doesn t mean that you don t have to employ other security techniques for mitigation of attacks. And very often you have to configure the typeFilterLevel to full because perhaps you need callbacks to the client or similar things. In this case, you have to include additional security gatekeepers to protect against threats like strong authentication and encryption of traffic. You can find more about security and .NET Remoting in 5. Versioning Behavior Depending on the setting of the includeVersion attribute on the client-side formatter and the strictBinding attribute on the server-side formatter, different methods for creating instances of the given types are employed:
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