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IvanHunters
f05718b2de
<!-- Thank you for making a contribution! Here are some tips for you: - Use Conventional Commits for the PR title: `type(scope): description` - Types: feat, fix, docs, style, refactor, perf, test, build, ci, chore - Scopes are not an exhaustive list — pick the most specific scope for the change and extend the list when a genuinely new area appears. Examples: - System components: dashboard, platform, operator, cilium, kube-ovn, linstor, fluxcd, cluster-api - Managed apps: postgres, mariadb, redis, kafka, clickhouse, virtual-machine, kubernetes - Development and maintenance: api, hack, tests, ci, docs, maintenance - Breaking changes: append `!` after type/scope (`feat(api)!: ...`) or add a `BREAKING CHANGE:` footer - If it's a work in progress, consider creating this PR as a draft. - Don't hesistate to ask for opinion and review in the community chats, even if it's still a draft. - Add the label `kind/backport` if it's a bugfix that needs to be backported to a previous version. --> ## What this PR does An admission policy now refuses a Redis release that would expose a plaintext endpoint outside the cluster. Redis never turns TLS on by itself, so `external: true` without `tls.enabled: true` is exactly that case. The error names the release and a remedy that works. The rule has three parts, because TLS is fixed when a Redis instance is created: the RedisFailover schema refuses a change, while the Redis API accepts one and the HelmRelease then fails. A spec's `tls.enabled` is therefore a request, not proof of what the instance runs. - On create, `external: true` needs `tls.enabled: true`. - On update, turning `external` on is refused whatever `tls.enabled` says. - While `external` stays on, `tls.enabled` cannot change. Before the first reconcile nothing else stops TLS being dropped from a release admitted as external with TLS. Withdrawing `external` in the same edit lifts the freeze, and the callers trusted by `cozystack-tenant-host-policy` are exempt, so an instance whose TLS was flipped earlier can still be unblocked. Edits to a release that was already external pass, so releases exposed in plaintext before this policy keep working. The guarantee covers the Redis app. A generic publisher such as `tcp-balancer` can still forward to a plaintext Redis, by design. This diverges from the Security section of the `external-database-exposure` proposal, which refuses only an explicit `tls.enabled: false` and covers every engine. That rule was written before redis had TLS and matches only postgres. Postgres is left out here on purpose: CloudNativePG keeps `ssl=on` and its default pg_hba accepts plaintext from any client that asks, whatever the chart's `tls.enabled` says, so an admission rule on that field closes nothing. That gap is #4619. The proposal update and a decision record are cozystack/community#91. The policy follows `cozystack-tenant-host-policy`: a ValidatingAdmissionPolicy in `cozystack-basics`, enforced inside `cozystack-api` for the aggregated kind. Its decisions are tested in Go by compiling the shipped template with the apiserver's own CEL compiler and running Redis objects through it, including the bypass sequences found in review. A structural chart test can't show what the policy admits. The redis README, the `external` field description and the threat model describe the new rule. Related: #4622 (valkey `external` is always plaintext), #4624 (the redis `tls.enabled` description implies a live switch). ### Screenshots <!-- REQUIRED for UI changes: attach screenshots or screen recordings demonstrating the visual impact of your changes. PRs with UI changes without screenshots will not be merged. --> ### Downstream repositories <!-- Cozystack is upstream for repositories that are NOT kept in sync with it automatically, and nothing in CI compares the two sides, so a change here can break them silently. Which change forces what, and which file to touch, is the trigger map in docs/agents/contributing.md under "Downstream Repositories". Walk it before you tick anything. IF YOU ARE AN AI AGENT OR AN LLM, THIS IS PART OF THE TASK, NOT A FORM TO FILL IN: 1. Walk the trigger map against the actual diff of this PR, file by file. Do not decide from the PR title or from your memory of what you changed. 2. For every repository you tick, open the follow-up PR there and link it on the same line. A ticked box with no link claims work that does not exist, which is worse than an empty box. Search that repository for an open PR or issue covering it first, and link that instead of filing a duplicate. 3. When the follow-up is out of scope, or needs a decision that is not yours to make, open an issue in that repository instead, link that, and say so in the PR body. Do not push a speculative PR into another repository just to fill a line here. 4. Do not tick "No downstream repository is affected" to make the checklist go away. If you are unsure, leave every box empty and say so in the PR body, so a human decides. --> - [ ] No downstream repository is affected by this change - [ ] [cozystack/website](https://github.com/cozystack/website) - follow-up: - [ ] [cozystack/terraform-provider-cozystack](https://github.com/cozystack/terraform-provider-cozystack) - follow-up: - [ ] [cozystack/ansible-cozystack](https://github.com/cozystack/ansible-cozystack) - follow-up: - [ ] [cozystack/ccp](https://github.com/cozystack/ccp) - follow-up: - [ ] [cozystack/talm](https://github.com/cozystack/talm) - follow-up: - [ ] [cozystack/cozyhr](https://github.com/cozystack/cozyhr) - follow-up: - [ ] [cozystack/cozy-proxy](https://github.com/cozystack/cozy-proxy) - follow-up: - [ ] [cozystack/cozystack-telemetry-server](https://github.com/cozystack/cozystack-telemetry-server) - follow-up: - [ ] [cozystack/external-apps-example](https://github.com/cozystack/external-apps-example) - follow-up: - [ ] [cozystack/examples](https://github.com/cozystack/examples) - follow-up: - [ ] [cozystack/community](https://github.com/cozystack/community) - follow-up: I walked the trigger map against the diff and nothing in it fires, but I left the boxes empty because cozystack/community is reached anyway: the `external-database-exposure` proposal still states the old admission rule. Its update and a decision record are cozystack/community#91. ### Release note <!-- Write a release note: - Explain what has changed internally and for users. - Start with the same `type(scope):` prefix as in the PR title - Follow the guidelines at https://github.com/kubernetes/community/blob/master/contributors/guide/release-notes.md. --> ```release-note feat(redis)!: a Redis release can be exposed outside the cluster only when it is created with `tls.enabled: true`. Creating one with `external: true` and no TLS, turning `external` on for an existing instance, or changing `tls.enabled` while `external` is on is refused at admission. Instances already external without TLS keep working and stay editable. ``` <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **New Features** * Redis admission checks now require TLS when external access is enabled at instance creation. They block enabling external access on an existing instance and changing TLS while external access remains enabled. Disabling external access in the same update allows TLS changes. * Existing instances that already had external access without TLS before the policy was introduced remain editable. * **Documentation** * Updated Redis configuration and security guidance to explain these restrictions and TLS migration behavior. <!-- end of auto-generated comment: release notes by coderabbit.ai -->