Validating a certificate in Hololens

ASerre · March 2017

I am currently building a project for Hololens, using Visual Studio and Unity3D. This project uses external dll's, among which RestSharp and Manatee.Json. My application uses those libraries to make calls to Trello's API in C#.

Curently, my project runs perfectly on Unity's "Play mode". However, when I try to build the project, I get the following error :

Assets\Scripts\Controller\RestController.cs(25,9): error CS0103: The name 'ServicePointManager' does not exist in the current context

Here is the incriminated line :

ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };

I believe I get the error because ServicePointManager is not part of .net Core, which is my build target.

I tried removing this line entirely, and the project manages to build properly. However, at runtime I get the following error :

TlsException: Invalid certificate received from server. Error code: 0xffffffff80092012
Mono.Security.Protocol.Tls.Handshake.Client.TlsServerCertificate.validateCertificates (Mono.Security.X509.X509CertificateCollection certificates)

Googling the error yield solutions using the ServicePointManager.ServerCertificateValidationCallback method, which I can't use do due to .net Core restrictions.

What is the proper way to validate my certificate for Hololens ?

Curent Settings:

Unity 5.5.0f3 & HoloToolkit v 1.5.5.0
Build settings : SDK Universal 10, Target device Hololens, Build Type D3D
Compilation override : Use Net Core
On all my DLL's : Checkbox "Don't Process" ticked

james_ashley · March 2017

@Aserre,

Definitely a .NET 3.5 vs .NETCore difference in handling certificates. I ran into this recently with the Windows Device Portal Wrapper. There's an article on validating certificates in UWP here that should be helpful.

ASerre · March 2017

@james_ashley Thanks for the link! However, the solution uses async methods which requires C# 5. Is there a workaround that uses the version supported by unity ?

james_ashley · March 2017

@Aserre,

There isn't really a workaround. You could, however, use conditional declarations to let the async calls get invoked in the runtime but not in the editor.

#if UNITY_EDITOR
    Debug.Log("Unity Editor");
#endif

Validating a certificate in Hololens

Answers