fix: Ensure changes in MatchCN annotation are detected

[wdullaer]

What this PR does / why we need it:

Ensure the AuthTLS config correctly detects changes in MatchCN.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• CVE Report (Scanner found CVE and adding report)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation only

Which issue/s this PR fixes

Fixes #10915

How Has This Been Tested?

I have built the docker image and deployed it into our kubernetes cluster that was exhibiting the bug.
When this version is running the nginx.conf file is correctly updated when the nginx.ingress.kubernetes.io/auth-tls-match-cn is updated.

I could not immediately find an end-to-end test that covers this scenario, but if you point me in the right direction, I'll happily add one.

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have added unit and/or e2e tests to cover my changes.
• All new and existing tests passed.

[k8s-ci-robot]

This issue is currently awaiting triage.

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[k8s-ci-robot]

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[strongjz]

The e2e test for this looks to be here.

https://github.com/kubernetes/ingress-nginx/blob/main/test/e2e/annotations/authtls.go#L267

[wdullaer]

None of the reload behaviour seems to be tested there right now.
Shall I try to add one test?

Edit: added an e2e test which exercises the reload behaviour of this annotation.

[wdullaer]

The linting issues are in files I didn't touch. Am I expected to fix these?
Edit: nothing a rebase of main can't fix.

[github-actions]

This is stale, but we won't close it automatically, just bare in mind the maintainers may be busy with other tasks and will reach your issue ASAP. If you have any question or request to prioritize this, please reach #ingress-nginx-dev on Kubernetes Slack.

[k8s-triage-robot]

The lifecycle/frozen label can not be applied to PRs.

This bot removes lifecycle/frozen from PRs because:

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• PRs that remain open for >150 days are unlikely to be easily rebased

You can:

• Rebase this PR and attempt to get it merged
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Please send feedback to sig-contributor-experience at kubernetes/community.

/remove-lifecycle frozen

[wdullaer]

This PR is still valid:

• The issue is still present
• The fix still works
• Tests are passing
• Nothing needs to be rebased

From my point of view, there is no work left to be done. I'm waiting for maintainer feedback/review.

[wdullaer]

@puerco @cpanato Do you have an indication for when this change can be reviewed?

We're still suffering from this bug in production, and I don't really look forward to maintaining a custom version of the ingress long term.

The code change itself is very small, it shouldn't take too long.

[strongjz]

/lgtm

/cherry-pick release-1.10

/cherry-pick release-1.11

[k8s-infra-cherrypick-robot]

@strongjz: once the present PR merges, I will cherry-pick it on top of release-1.10 in a new PR and assign it to you.

In response to this:

/lgtm

/cherry-pick release-1.10

/cherry-pick release-1.11

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: strongjz, wdullaer

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Needs approval from an approver in each of these files:

• OWNERS [strongjz]

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[k8s-infra-cherrypick-robot]

@strongjz: new pull request created: #11528

In response to this:

/lgtm

/cherry-pick release-1.10

/cherry-pick release-1.11

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[k8s-infra-cherrypick-robot]

@strongjz: new pull request created: #11529

In response to this:

/lgtm

/cherry-pick release-1.10

/cherry-pick release-1.11

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.