docs(security): add security process

Signed-off-by: Oliver Bähler <[email protected]>

CONTRIBUTING.md

@@ -6,6 +6,17 @@ All contributions are welcome! If you find a bug or have a feature request, plea
 ## Guidelines
 
 
+## Supported Versions
+Versions follow [Semantic Versioning](https://semver.org/) terminology and are expressed as `x.y.z`:
+
+- where x is the major version
+- y is the minor version
+- and z is the patch version
+
+Security fixes, may be backported to the three most recent minor releases, depending on severity and feasibility.
+
+Prereleases are marked as `-rc.x` (release candidate) and may refere to any type of version bump.
+
 ## Pull Requests
 
 

SECURITY.md

@@ -0,0 +1,118 @@
+# Security Policy
+
+The Capsule community has adopted this security disclosures and response policy to ensure we responsibly handle critical issues.
+
+## Bulletins
+
+For information regarding the security of this project please join our [slack channel](https://kubernetes.slack.com/archives/C03GETTJQRL).
+
+
+## Covered Repositories and Issues
+
+When we say "a security vulnerability in capsule" we mean a security issue
+in any repository under the [projectcapsule GitHub organization](https://github.com/projectcapsule/).
+
+This reporting process is intended only for security issues in the capsule
+project itself, and doesn't apply to applications _using_ capsule or to
+issues which do not affect security.
+
+Don't use this process if:
+
+  * You have issues with your capsule installation or configuration
+  * Your issue is not security related
+
+
+### Explicitly Not Covered: Vulnerability Scanner Reports
+
+We do not accept reports which amount to copy and pasted output from a vulnerability
+scanning tool **unless** work has specifically been done to confirm that a vulnerability
+reported by the tool _actually exists_ in capsule.
+
+## Reporting a Vulnerability
+
+
+  1. Describe the issue in English, ideally with some example configuration or code which allows the issue to be reproduced. Explain why you believe this to be a security issue in capsule, if that's not obvious. Emails should contain:
+
+     * description of the problem
+     * precise and detailed steps (include screenshots) 
+     * the affected version(s). This may also include environment relevant versions.
+     * any possible mitigations
+
+
+
+   2. Send the email to [`[email protected]`](mailto:[email protected])
+   3. You may be contacted by a project maintainer to further discuss the reported item. Please bear with us as we seek to understand the breadth and scope of the reported problem, recreate it, and confirm if there is a vulnerability present.
+
+## Reponse
+
+Response times could be affected by weekends, holidays, breaks or time zone differences. That said, the security response team will endeavour to reply as soon as possible, ideally within 5 working days.
+
+## Security Contacts
+
+[Maintainers](./github/maintainers.yaml) of this project are responsible for the security of the project as outlined in this policy.
+
+# Release Artifacts
+
+All packages are published in the package registry of the repository.
+
+
+## Verifing
+
+To verify artifacts you need to have [cosign installed](https://github.com/sigstore/cosign#installation). This guide assumes you are using v2.x of cosign. All of the signatures are created using [keyless signing](https://docs.sigstore.dev/verifying/verify/#keyless-verification-using-openid-connect). We have a seperate repository for all the signatures for all the artifacts released under the projectcapsule - `ghcr.io/projectcapsule/signatures`. You can set the environment variable `COSIGN_REPOSITORY` to point to this repository. For example:
+
+    export COSIGN_REPOSITORY=ghcr.io/projectcapsule/signatures
+
+To verify the signature of the docker image, run the following command. Replace `<release_tag>` with an [available release tag](https://github.com/projectcapsule/capsule/pkgs/container/capsule):
+
+    COSIGN_REPOSITORY=ghcr.io/projectcapsule/signatures cosign verify ghcr.io/projectcapsule/capsule:<release_tag> \
+      --certificate-identity-regexp="https://github.com/projectcapsule/capsule/.github/workflows/docker-publish.yml@refs/tags/*" \
+      --certificate-oidc-issuer="https://token.actions.githubusercontent.com" | jq
+
+To verify the signature of the helm image, run the following command. Replace `<release_tag>` with an [available release tag](https://github.com/projectcapsule/capsule/pkgs/container/charts%2Fcapsule):
+
+    COSIGN_REPOSITORY=ghcr.io/projectcapsule/signatures cosign verify ghcr.io/projectcapsule/charts/capsule:<release_tag> \
+      --certificate-identity-regexp="https://github.com/projectcapsule/capsule/.github/workflows/helm-publish.yml@refs/tags/*" \
+      --certificate-oidc-issuer="https://token.actions.githubusercontent.com" | jq
+
+
+## Verifying Provenance
+
+Capsule creates and attests to the provenance of its builds using the [SLSA standard](https://slsa.dev/spec/v0.2/provenance) and meets the [SLSA Level 3](https://slsa.dev/spec/v0.1/levels) specification. The attested provenance may be verified using the cosign tool.
+
+Verify the provenance of the docker image. Replace `<release_tag>` with an [available release tag](https://github.com/projectcapsule/capsule/pkgs/container/capsule)
+
+```bash
+cosign verify-attestation --type slsaprovenance \
+  --certificate-identity-regexp="https://github.com/slsa-framework/slsa-github-generator/.github/workflows/generator_container_slsa3.yml@refs/tags/*" \
+  --certificate-oidc-issuer="https://token.actions.githubusercontent.com" \
+  ghcr.io/projectcapsule/capsule:<release_tag> | jq .payload -r | base64 --decode | jq
+```
+
+Verify the provenance of the helm image. Replace `<release_tag>` with an [available release tag](https://github.com/projectcapsule/capsule/pkgs/container/charts%2Fcapsule)
+
+```bash
+cosign verify-attestation --type slsaprovenance \
+  --certificate-identity-regexp="https://github.com/slsa-framework/slsa-github-generator/.github/workflows/generator_container_slsa3.yml@refs/tags/*" \
+  --certificate-oidc-issuer="https://token.actions.githubusercontent.com" \
+  ghcr.io/projectcapsule/charts/capsule:<release_tag> | jq .payload -r | base64 --decode | jq
+```
+
+## Software Bill of Materials (SBOM)
+
+An SBOM (Software Bill of Materials) in CycloneDX JSON format is published for each Kyverno release, including pre-releases. Like signatures, SBOMs are stored in a separate repository at `ghcr.io/projectcapsule/sbom`. You can set the environment variable `COSIGN_REPOSITORY` to point to this repository. For example:
+
+    export COSIGN_REPOSITORY=ghcr.io/projectcapsule/sbom
+
+To inspect the SBOM of the docker image, run the following command. Replace `<release_tag>` with an [available release tag](https://github.com/projectcapsule/capsule/pkgs/container/capsule):
+
+
+    COSIGN_REPOSITORY=ghcr.io/projectcapsule/sbom cosign download sbom ghcr.io/projectcapsule/capsule:<release_tag>
+
+To inspect the SBOM of the helm image, run the following command. Replace `<release_tag>` with an [available release tag](https://github.com/projectcapsule/capsule/pkgs/container/charts%2Fcapsule):
+
+    COSIGN_REPOSITORY=ghcr.io/projectcapsule/sbom cosign download sbom ghcr.io/projectcapsule/charts/capsule:<release_tag>
+
+
+# Credits
+
+Our Security Policy and Workflows are based on the work of the [Kyverno](https://github.com/kyverno) and [Cert-Manager](https://github.com/cert-manager) community.