Deploying containers - Container security | Security | OpenShift Container Platform 4.4

Controlling container deployments with triggers
Controlling what image sources can be deployed
Using signature transports
Creating secrets and config maps
Automating continuous deployment

You can use a variety of techniques to make sure that the containers you deploy hold the latest production-quality content and that they have not been tampered with. These techniques include setting up build triggers to incorporate the latest code and using signatures to ensure that the container comes from a trusted source and has not been modified.

Controlling container deployments with triggers

If something happens during the build process, or if a vulnerability is discovered after an image has been deployed, you can use tooling for automated, policy-based deployment to remediate. You can use triggers to rebuild and replace images, ensuring the immutable containers process, instead of patching running containers, which is not recommended.

For example, you build an application using three container image layers: core, middleware, and applications. An issue is discovered in the core image and that image is rebuilt. After the build is complete, the image is pushed to your OpenShift Container Registry. OpenShift Container Platform detects that the image has changed and automatically rebuilds and deploys the application image, based on the defined triggers. This change incorporates the fixed libraries and ensures that the production code is identical to the most current image.

You can use the oc set triggers command to set a deployment trigger. For example, to set a trigger for a deployment called deployment-example:

$ oc set triggers deploy/deployment-example \
    --from-image=example:latest \
    --containers=web

Controlling what image sources can be deployed

It is important that the intended images are actually being deployed, that the images including the contained content are from trusted sources, and they have not been altered. Cryptographic signing provides this assurance. OpenShift Container Platform enables cluster administrators to apply security policy that is broad or narrow, reflecting deployment environment and security requirements. Two parameters define this policy:

one or more registries, with optional project namespace
trust type, such as accept, reject, or require public key(s)

You can use these policy parameters to allow, deny, or require a trust relationship for entire registries, parts of registries, or individual images. Using trusted public keys, you can ensure that the source is cryptographically verified. The policy rules apply to nodes. Policy may be applied uniformly across all nodes or targeted for different node workloads (for example, build, zone, or environment).

Example image signature policy file

{
    "default": [{"type": "reject"}],
    "transports": {
        "docker": {
            "access.redhat.com": [
                {
                    "type": "signedBy",
                    "keyType": "GPGKeys",
                    "keyPath": "/etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release"
                }
            ]
        },
        "atomic": {
            "172.30.1.1:5000/openshift": [
                {
                    "type": "signedBy",
                    "keyType": "GPGKeys",
                    "keyPath": "/etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release"
                }
            ],
            "172.30.1.1:5000/production": [
                {
                    "type": "signedBy",
                    "keyType": "GPGKeys",
                    "keyPath": "/etc/pki/example.com/pubkey"
                }
            ],
            "172.30.1.1:5000": [{"type": "reject"}]
        }
    }
}

The policy can be saved onto a node as /etc/containers/policy.json. Saving this file to a node is best accomplished using a new MachineConfig object. This example enforces the following rules:

Require images from the Red Hat Registry (registry.access.redhat.com) to be signed by the Red Hat public key.
Require images from your OpenShift Container Registry in the openshift namespace to be signed by the Red Hat public key.
Require images from your OpenShift Container Registry in the production namespace to be signed by the public key for example.com.
Reject all other registries not specified by the global default definition.

Using signature transports

A signature transport is a way to store and retrieve the binary signature blob. There are two types of signature transports.

atomic: Managed by the OpenShift Container Platform API.
docker: Served as a local file or by a web server.

The OpenShift Container Platform API manages signatures that use the atomic transport type. You must store the images that use this signature type in your OpenShift Container Registry. Because the docker/distribution extensions API auto-discovers the image signature endpoint, no additional configuration is required.

Signatures that use the docker transport type are served by local file or web server. These signatures are more flexible; you can serve images from any container image registry and use an independent server to deliver binary signatures.

However, the docker transport type requires additional configuration. You must configure the nodes with the URI of the signature server by placing arbitrarily-named YAML files into a directory on the host system, /etc/containers/registries.d by default. The YAML configuration files contain a registry URI and a signature server URI, or sigstore:

Example registries.d file

docker:
    access.redhat.com:
        sigstore: https://access.redhat.com/webassets/docker/content/sigstore

In this example, the Red Hat Registry, access.redhat.com, is the signature server that provides signatures for the docker transport type. Its URI is defined in the sigstore parameter. You might name this file /etc/containers/registries.d/redhat.com.yaml and use the Machine Config Operator to automatically place the file on each node in your cluster. No service restart is required since policy and registries.d files are dynamically loaded by the container runtime.

Creating secrets and config maps

The Secret object type provides a mechanism to hold sensitive information such as passwords, OpenShift Container Platform client configuration files, dockercfg files, and private source repository credentials. secrets decouple sensitive content from pods. You can mount secrets into containers using a volume plug-in or the system can use secrets to perform actions on behalf of a pod.

For example, to add a secret to your deployment configuration so that it can access a private image repository, do the following:

Procedure

Log in to the OpenShift Container Platform web console.
Create a new project.
Navigate to Resources → secrets and create a new secret. Set Secret Type to Image Secret and Authentication Type to Image Registry Credentials to enter credentials for accessing a private image repository.
When creating a deployment configuration (for example, from the Add to Project → Deploy Image page), set the Pull Secret to your new secret.

Config maps are similar to secrets, but are designed to support working with strings that do not contain sensitive information. The ConfigMap object holds key-value pairs of configuration data that can be consumed in pods or used to store configuration data for system components such as controllers.

Automating continuous deployment

You can integrate your own continuous deployment (CD) tooling with OpenShift Container Platform.

By leveraging CI/CD and OpenShift Container Platform, you can automate the process of rebuilding the application to incorporate the latest fixes, testing, and ensuring that it is deployed everywhere within the environment.

Additional resources

Input secrets and config maps