Supporting configurable encryption for Redwood, which supports switching to different encryption algorithm and having variable size encryption header.
Currently to support both old (non-configurable) and new (configurable) encryption header, the PR assume we have a fixed size encryption header (104 bytes) which is large enough to fit both kind of encryption header. Moving forward the plan is to update the IPager interface to support variable size encoding header, and when Redwood tries to in-place update a page but the reserved encoding header buffer is not large enough, rebuild the page instead.
The PR is updating storage server and Redwood to enable encryption based on the encryption mode in DB config, which was previously controlled by a knob. High level changes are
1. Passing encryption mode in DB config to storage server
1.1 If it is a new storage server, pass the encryption mode through `InitializeStorageRequest`. the encryption mode is pass to Redwood for initialization
1.2 If it is an existing storage server, on restart the storage server will send `GetStorageServerRejoinInfoRequest` to commit proxy, and commit proxy will return the current encryption mode, which it get from DB config on its own initialization. Storage server will compare the DB config encryption mode to the local storage encryption mode, and fail if they don't match
2. Adding a new `encryptionMode()` method to `IKeyValueStore`, which return a future of local encryption mode of the KV store instance. A KV store supporting encryption would need to persist its own encryption mode, and return the mode via the API.
3. Redwood accepts encryption mode from its constructor. For a new Redwood instance, caller has to specific the encryption mode, which will be stored in Redwood per-instance file header. For existing instance, caller is supposed to not passing the encryption mode, and let Redwood find it out from its own header.
4. Refactoring in Redwood to accommodate the above changes.
* Fix Redwood tree height overgrowth when EaR and tenant page split are enabled, by removing the buildNewSubtree() logic.
* Fixing incorrect page upper bound for the last page created by writePages() without the buildNewSubtree() logic.
* Enable tenant page split if encryption mode is domain-aware encryption.
* Related test fixes:
- In simulation, pass encryption mode to storage/Redwood via knobs. This is a workaround to enable testing with Redwood encryption before we correctly pass the encryption mode via db config. Also temporarily disable tenant page split for restart tests.
- Disable raw access in FuzzApiCorrectness test if domain-aware encryption is enabled, to avoid test timeout
- Disable encryption for DrUpgradeRestart test, which is likely to fail due to a rare EKP deadlock issue blocking recovery. Will re-enable after the deadlock issue is fixed.
The unit test intentionally cause unexpected_encoding_type being thrown, which would hit a simulation only assert failure. Disabling that assert in this case.
Previously with EaR we always enable authentication (e.g. we encrypt Redwood pages). The authentication is a form of checksum, so dedicated page checksum was not needed. This PR adds back xxhash page checksum when authentication is disabled. Also change the knob to default disable authentication.
We have a recent redesign that no longer required to pass tenant name to get encryption key, and also not allowing optional tenant mode for tenant-aware encryption. This PR clean up Redwood code to remove tenant map usage, and update various checks accordingly.
Changes:
* Cleanup TenantPrefixIndex in TenantAwareEncryptionKeyProvider and related logic in storage server and Redwood for passing the map around.
* Cleanup and update DecodeBoundaryVerifier the reflect the new design.
* A minor fix to writePages() that avoid a page that's default domain encrypted having a lower bound key belonging to a non-default domain.
* Fix TenantAwareEncryptionKeyProvider::getEncryptionDomain() returning wrong prefix long for system domain.
* A minor change to add a context string to IoTimeoutError.
Josh Slocum