.net - The correct way to call unmanaged code from partially trusted code -


What is the right way to call unmanaged code such as Com API? A partially reliable environment?

While developing an ASP.NET WebPort for Microsoft SharePoint, I had to communicate with another system through my Com API. I resolved this issue temporarily by changing the permissions of SharePoint completely. Later I have refined it by implementing the custom security at the top of the settings which allow SharePoint UnmanagedCode but it is not that a major improvement in the form of unmanaged code could leave the rest of the CAS.

I've probably needed a completely dependable assembly which allows partially reliable calls and acts as a layer between managed and unmanaged domains. Apart from this, I imagine that some additional settings are required which allows partially reliable code to partially call reliable code without fully trustworthy code suffixed with the permission of the trusted code.

So what is the right way and how to implement it in practice?

Yes, you need a completely dependable assembly which is partly trusted callers and managed and Works as a layer between unmanaged domains.

If you write code that should be partially negotiated with a trusted code or should operate partly by reliable context, then you should consider the following factors:

  • The libraries should be signed with a strong name to be shared by multiple applications. Powerful names can be kept in your global assembly cache and your users are allowed to verify that a particular part of the mobile code is actually generated by you.
  • By default, the robust-named shared library provides an embedded link
  • If there is no confidence in a collar but still attempts to call such a library, then Runtime throws a security acceleration and the caller is not allowed to link in the library.
  • In order to prevent automatic link denomination and throwing exceptions, you can place the AllowPartiallyTrustedCallersAttribute attribute on the assembly scope of a shared library. This feature allows your libraries to call with partially reliable managed code.
  • Partially reliable code that is granted access to a library with this feature is still subject to more restrictions set by the local machine policy.
  • There is no programmatic method for partly dependent code in which a library is not allowed to call which does not have the attributed trusted callers attribute attribute. If an application does not receive full trust by default, then the administrator must modify the security policy and give full confidence to the application before calling such a library.

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