kubewarden/verify-image-signatures

Feature Request: Update policy verify-image-signatures to support certificates

Closed this issue · 6 comments

zosocanuck commented

Is your feature request related to a problem?

Support for policies based on single public keys will be difficult to manage especially in larger deployments where they may be many code signing keys/certificates.

Solution you'd like

Enhance the verify-image-signatures plugin to support both certificates and certificate chains.

An example policy could be:

apiVersion: policies.kubewarden.io/v1
kind: ClusterAdmissionPolicy
metadata:
  name: verify-image-signatures-policy
spec:
  module: registry://ghcr.io/kubewarden/policies/verify-image-signatures:v0.1.7
  rules:
  - apiGroups: [""]
    apiVersions: ["v1"]
    resources: ["pods"]
    operations:
    - CREATE
    - UPDATE
  mutating: true
  settings:
    signatures:
      - image: "*" # match all tags 
          cert:
            - "-----BEGIN CERTIFICATE-----..."

This could also be extended to support a policy where you specify a CA chain, and any code signing certificates trusted by that chain could be used to validate the policy.

Alternatives you've considered

No response

Anything else?

No response

flavio commented

Linked issues:

viccuad commented

Wrongly closed by GH issue automation, there's still a check to perform.

flavio commented

Everything is out. Starting from kubewarden 1.4.0 and [verify-image-signatures] v0.2.0 it's possible to perform certificate based verification.

@zosocanuck: thanks for having submitted this feature request. Let us know if there's anything we need to improve

zosocanuck commented

@flavio Thanks.

I'm getting this error now after deploying an updated certificate chain policy:

2022-12-05T17:55:25.694219Z ERROR policy_server::worker_pool: cannot validate policy settings error=[clusterwide-verify-image-signatures-policy] settings are not valid: Some("Error invoking settings validation callback: GuestCallFailure(\"Error decoding validation payload {\\\"signatures\\\":[{\\\"certificateChain\\\":[\\\"-----BEGIN CERTIFICATE-----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\\\\nkA==\\\\n-----END CERTIFICATE-----\\\\n\\\"],\\\"certificates\\\":[\\\"-----BEGIN CERTIFICATE-----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\\\\n/Dh0ED3NV1wzYgERbM5239WMhQ==\\\\n-----END CERTIFICATE-----\\\\n\\\"],\\\"image\\\":\\\"ghcr.io/zosocanuck/*\\\"}]}: Error(\\\"data did not match any variant of untagged enum Signature\\\", line: 1, column: 3276)\")")
2022-12-05T17:55:25.694297Z ERROR policy_server: [clusterwide-verify-image-signatures-policy] settings are not valid: Some("Error invoking settings validation callback: GuestCallFailure(\"Error decoding validation payload {\\\"signatures\\\":[{\\\"certificateChain\\\":[\\\"-----BEGIN CERTIFICATE-----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\\\\nkA==\\\\n-----END CERTIFICATE-----\\\\n\\\"],\\\"certificates\\\":[\\\"-----BEGIN CERTIFICATE-----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\\\\n/Dh0ED3NV1wzYgERbM5239WMhQ==\\\\n-----END CERTIFICATE-----\\\\n\\\"],\\\"image\\\":\\\"ghcr.io/zosocanuck/*\\\"}]}: Error(\\\"data did not match any variant of untagged enum Signature\\\", line: 1, column: 3276)\")")

apiVersion: policies.kubewarden.io/v1
kind: ClusterAdmissionPolicy
metadata:
  name: verify-image-signatures-policy
spec:
  module: ghcr.io/kubewarden/policies/verify-image-signatures:v0.2.0
  rules:
  - apiGroups: [""]
    apiVersions: ["v1"]
    resources: ["pods"]
    operations:
    - CREATE
    - UPDATE
  mutating: true
  settings:
    signatures:
      - image: "ghcr.io/zosocanuck/*" # match all tags 
        certificates:
        - |
          -----BEGIN CERTIFICATE-----
          MIIFHzCCBAegAwIBAgITKAAABTyFoQHCB5qI1gAAAAAFPDANBgkqhkiG9w0BAQsF
          ADBZMRMwEQYKCZImiZPyLGQBGRYDY29tMRowGAYKCZImiZPyLGQBGRYKdmVuYWZp
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          ZW5hZmlkZW1vLmNvbTBZMBMGByqGSM49AgEGCCqGSM49AwEHA0IABMslgJPVmgPT
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          /Dh0ED3NV1wzYgERbM5239WMhQ==
          -----END CERTIFICATE-----
        certificateChain:
        - |
          -----BEGIN CERTIFICATE-----
          MIIDjTCCAnWgAwIBAgIQb8yUrbw3aYZAubIjOJkFBjANBgkqhkiG9w0BAQsFADBZ
          MRMwEQYKCZImiZPyLGQBGRYDY29tMRowGAYKCZImiZPyLGQBGRYKdmVuYWZpZGVt
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          FlDw3fzPhtberBblY4Y9u525ev999SogMBTXoSkfajRR2ol10xUxY60kVbqoEUln
          kA==
          -----END CERTIFICATE-----
zosocanuck commented

on further troubleshooting it turns out the policy was failing due to the following missing policy:

requireRekorBundle: false

  • 👍2
flavio commented

We could make requireRekorBundle optional, and set it to either true or false by default. However I think this is security sensitive detail the user must provide. Hence the decision to not make it optional.

We can talk more about that if you think this should be made optional