This change introduces a `nonceFn` field that can be changed
by a test but at runtime is transparent to the code that calls it.
The current nonce-generating logic defaults to a test-only field which
opens us up to this value inadvertently being set.
With this change, the default behavior becomes using `base62` to
generate a random nonce, and any tests have to explicitly change that.
This stores worker connection nonces within the database to ensure
uniqueness of connections. Prior the connection required any attacker to
be able to decrypt the incoming encrypted authentication message in
order to replay (and if the attacker has access to the KMS you have
bigger problems), but with this change even if an attacker does have
access to the KMS key, they cannot reuse the same message. (If they're
able to encrypt against the KMS key, they can still act as a worker with
a new message, so this only really helps if they only have decryption
capabilities.)
* refactor(worker): Move tcp_proxy into its own package
This refactors:
- the tcp_proxy.go into worker/proxy/tcp
- add a missing unit test for the HandleTcpProxyV1
- refactors session.go into worker/session, needed to avoid import cycle
- adds a baseline for a mock controller session client
- go lint fixes
* Add sleep between spinning listener goroutine and dialing
Co-authored-by: Jeff Mitchell <jeffrey.mitchell@gmail.com>
Go's TLS stack doesn't need a separate CA cert and in fact for sessions
we don't use this. So simplify the worker connection to remove an
unnecessary extra key generation.
* Possible api changes.
* Worker API update.
* Updating import alias name.
* Moving session down a level as a member of the GetSessionResponse.
* Marshal the auth flag into the GetSessionResponse proto instead of the session.
Hugo Vieira
Jeff Mitchell
Louis RuchandJeff Mitchell
s-christoff
Jim
Todd Knight