Backport of Remove pinned builtin plugin versions from storage into release/1.12.x #18102
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* Removes _builtin_ versions from mount storage where it already exists * Stops new builtin versions being put into storage on mount creation/tuning * Stops the plugin catalog from returning a builtin plugin that has been overridden, so it more accurately reflects the plugins that are available to actually run Conflicts: vault/mount.go
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swenson
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Backport
This PR is auto-generated from #18051 to be assessed for backporting due to the inclusion of the label backport/1.12.x.
WARNING automatic cherry-pick of commits failed. Commits will require human attention.
The below text is copied from the body of the original PR.
Addresses bug described in the 1.12 upgrade guide: https://developer.hashicorp.com/vault/docs/upgrading/upgrade-to-1.12.x#pinning-to-builtin-plugin-versions-may-cause-failure-on-upgrade.
In a nutshell, when we try to start a plugin after upgrading, if it has a builtin version stored in the mount table and that version subsequently disappeared from catalog due to the upgrade, we won't be able to mount it. To fix this, the main idea is to stop storing version information for builtin plugins, and rely on the pre-existing behaviour that not specifying a version selects the builtin (unless it's been shadowed by an unversioned external plugin).
2 main changes, that need to be done for each of the 3 plugin types:
Stopping storage for new mounts is easy enough. Cleaning up existing auth and secrets mounts also seems relatively straightforward thanks to some existing logic for upgrading their storage.
Unfortunately, database plugins don't seem to have any such existing capability, instead this relies on fixing storage whenever it's next written to for each db plugin. That means databases also need an extra shim to stop mounting from failing, because we may mount a plugin before the config has been fixed in storage. We also delete builtin plugin versions from a config read response, so the out of date storage is invisible to users unless they poke around in raw endpoints.
The approach also means users who have a builtin version pinned, and an unversioned plugin of the same name registered, will start running the unversioned plugin on upgrading. That deserves a callout in the changelog, but I don't expect it to be problematic for many people, as most people using versions for builtins will probably also use versions for externals. Plus it's still a very new feature, and the delta between the builtin and external versions is likely small.
I've also updated the plugin catalog to not return a builtin if it has been shadowed by an unversioned external plugin of the same name.
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