Trusted Root Certificates in DotNet Core on Linux (RHEL 7.1)

Question

I'm currently deploying a .net-core web-api to an docker container on rhel 7.1. Everything works as expected, but from my application I need to call other services via https and those hosts use certificates signed by self-maintained root certificates.

In this constellation I get ssl-errors while calling this services (ssl-not valid) and therefore I need to install this root-certificate in the docker-container or somehow use the root-certificate in the .net-core application.

How can this be done? Is there a best practice to handle this situation? Will .net-core access the right keystore on the rhel-system?

Answer 1

Since .NET Core uses OpenSSL on linux, you need to set up your linux environment in the container so that OpenSSL will pick up the certificate.

This is done by (+ Dockerfile examples):

1. Copying the the certificate .crt file to a location that update-ca-certificates will scan for trusted certificates - e.g. /usr/local/share/ca-certificates/ or on RHEL /etc/pki/ca-trust/source/anchors/:

    COPY myca.crt /usr/local/share/ca-certificates/
   

2. Invoking update-ca-certificates:

    RUN update-ca-certificates