.NET AWS Lambda Function

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I haven’t used .NET in a couple of years but a lot of pen testers are using it more now so thought I’d give it another look. Might come in handy. :) Also checking out how it works for my upcoming talk at RSA 2020 on Serverless Attack Vectors.

Install .NET SDK (CLI) on AWS EC2 Instance

The first thing I tried to do is to write it from scratch without .NET tools, but it was a pain. .NET generates a bunch of files required for a project that I forgot about. I got errors like this one.

{
  "errorType": "LambdaException",
  "errorMessage": "Could not find the required 'LambdaTest.deps.json'.  This file should be present at the root of the deployment package."
}

I didn’t want more tools on local machine so for a quick test I installed it on an AWS EC2 instance.

sudo rpm -Uvh https://packages.microsoft.com/config/centos/7/packages-microsoft-prod.rpm
sudo yum install dotnet-sdk-3.1

Simple AWS .NET Lambda Test

Once I got over my aversion to installing a bunch of different tools to do a simple thing, I followed an AWS tutorial but hit a couple of glitches so…