Infralution Support

[absvm]

Hi,

I have an application that uses C# scripting (Roslyn, Microsoft.CodeAnalysis).

When using C# scripting with a host class together with NetEncryptor, the program will terminate with an error pointing out that the methods and members in the host class are not existing in the current context.

In the case of this example, the host class has a public function Square(), the calling of which in a script produces the following error:

[Infralution]

Have you tried setting the INTEGRITY_LEVEL (passed to CheckProcessIntegrity) to 0. The anti-hooking code may possibly be interfering with the Scripting.

Another possibility is that the scripting engine may be relying on the entry executable containing the host class - but in this case the entry executable is the Bootstrap. If you can put together a small self contained project that demonstrates your problem and email it to support@infralution.com then we'd be happy to take a look and see if there is some way to work around this.
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Infralution Support

[absvm]

I tried setting INTEGRITY_LEVEL to 0 but same result.

I have a self contained example project that demonstrates the problem here ready for download:

https://github.com/absvm/NetEncryptorWithRoslyn.git

It's a bit too big for emailing with all the CodeAnalysis packages and dependencies so it would be good if you guys could pick it up from GitHub.

Curious to know if this can be resolved somehow.

rgds

[Infralution]

Thanks - we will take a look and see if we can find a solution.
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Infralution Support

[Infralution]

I found the following issue raised against Roslyn:

https://github.com/dotnet/roslyn/issues/6101

This seems to indicate that Roslyn can't use assemblies loaded from memory for the script host - which is the mechanism .NET Encryptor uses for loading assemblies.

I was able to get it to work by putting the ScriptHost class in a separate class library which is not encrypted (ie loaded from file) You have to make sure that the DLL containing the ScriptHost class (and all of the other CodeAnalysis DLLs) are copied into the bin directory for the Bootstrap project (since it doesn't reference these directly).

I don't know if doing the above is an option for you.
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Infralution Support

[absvm]

HI,

Good finding, that clears it up. I'll have to wait for the issue to fixed in Roslyn.

Yes, putting the host class in a separate not-encrypted dll is an option and since it's the only one I guess I'll use that. It's a potential vulnerability so I will keep my eyes open for a solution from the Roslyn side.

Thanks a lot for investigating.