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FIPS Support for the openstack operators

General information

FIPS 140-2 and 140-3 are designed to ensure that cryptographic tools implement their algorithms properly. In the operator-k8s context, a given operator can be considered FIPS compliant if the underlying components are FIPS validated.

Build a FIPS compliant operator

To be FIPS compliant, there are a few requirements and recommendation that should be take into account:

  • Use RHEL based images with openssl to build the binary (alpine or ubuntu images don’t have a FIPS validated openssl crypto library)
  • Do not use statically linked images
  • Set CGO_ENABLED=1
  • Go containers rely on OpenSSL to detect whether the system is in FIPS mode

Steps to build a FIPS compatible operator

In the Dockerfile, replace both the GOLANG_BUILDER and the OPERATOR_BASE image to point to the go-toolset and the ubi-minimal image:

ARG GOLANG_BUILDER=registry.access.redhat.com/ubi9/go-toolset:1.19
ARG OPERATOR_BASE_IMAGE=registry.access.redhat.com/ubi9/ubi-minimal:latest

In addition, the following parameters are required:

ARG GO_BUILD_EXTRA_ARGS="-tags strictfipsruntime"
ARG GO_BUILD_EXTRA_ENV_ARGS="CGO_ENABLED=1 GO111MODULE=on"

Pass the parameters defined above to the build command:

RUN if [ -f $CACHITO_ENV_FILE ] ; then source $CACHITO_ENV_FILE ; fi ; env ${GO_BUILD_EXTRA_ENV_ARGS} go build ${GO_BUILD_EXTRA_ARGS} -a -o ${DEST_ROOT}/manager main.go

Finally, in the Makefile, define build extra variables that can be passed to the container image build process:

DOCKER_BUILD_ARGS ?=
..
..
..
.PHONY: docker-build
docker-build: test ## Build docker image with the manager.
	podman build -t ${IMG} . ${DOCKER_BUILD_ARGS}

As mentioned earlier, the proposed change is based on:

  • go-toolset, available as a container image and allows Go to bypass the standard library cryptographic routines and call into a FIPS 140-2 validated cryptographic library

  • ubi9/ubi-minimal, that ships with several FIPS-validated cryptography libraries, including OpenSSL

CI - Check FIPS compliance

The check-payload tool can be used to verify if an operator image is FIPS compliant. It currently runs as a stage of the existing Prow jobs, where the operator image is built starting from the current PR. By default the check doesn't block merging a patch, but it's possible to let the CI fail if the tool detect a failure when the image is scanned. To enable the CI failure, edit the .prow_ci.env file present in the operator repository and add:

export FAIL_FIPS_CHECK=true

Feature reporting

Once an operator and its image are built in a FIPS compliant way, as described above, and the operator is also honoring the OpenShift Cluster FIPS mode when deploying its OpenStack services, the operator can announce that is fully FIPS compliant using an OpenShift specific annotation, as described in the OpenShift docs.

This means editing the operator's ClusterServiceVersion object, for example in cinder it's in the config/manifests/bases/cinder-operator.clusterserviceversion.yaml file, and setting the annotation:

metadata:
  annotations:
    features.operators.openshift.io/fips-compliant: "true"

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