Re-orient the management of the tr.kill to happen in the parent of
the spawned goroutine that is doing the actual token derivation. This
makes the code a little more straightforward, making it easier to
reason about not leaking the worker goroutine.
The derivation of an SI token needs to be safegaurded by a context
timeout, otherwise an unresponsive Consul could cause the siHook
to block forever on Prestart.
The TestEnvoyBootstrapHook_maybeLoadSIToken test case only works when
running as a non-priveleged user, since it deliberately tries to read
an un-readable file to simulate a failure loading the SI token file.
Was thinking about using the testing pattern where you create executable
shell scripts as test resources which "mock" the process a bit of code
is meant to fork+exec. Turns out that wasn't really necessary in this case.
When creating the envoy bootstrap configuration, we should append
the "-token=<token>" argument in the case where the sidsHook placed
the token in the secrets directory.
Nomad jobs may be configured with a TaskGroup which contains a Service
definition that is Consul Connect enabled. These service definitions end
up establishing a Consul Connect Proxy Task (e.g. envoy, by default). In
the case where Consul ACLs are enabled, a Service Identity token is required
for these tasks to run & connect, etc. This changeset enables the Nomad Server
to recieve RPC requests for the derivation of SI tokens on behalf of instances
of Consul Connect using Tasks. Those tokens are then relayed back to the
requesting Client, which then injects the tokens in the secrets directory of
the Task.
When a job is configured with Consul Connect aware tasks (i.e. sidecar),
the Nomad Client should be able to request from Consul (through Nomad Server)
Service Identity tokens specific to those tasks.
Enable any Server to lookup the unique ClusterID. If one has not been
generated, and this node is the leader, generate a UUID and attempt to
apply it through raft.
The value is not yet used anywhere in this changeset, but is a prerequisite
for gh-6701.
This change provides an initial pass at setting up the configuration necessary to
enable use of Connect with Consul ACLs. Operators will be able to pass in a Consul
Token through `-consul-token` or `$CONSUL_TOKEN` in the `job run` and `job revert`
commands (similar to Vault tokens).
These values are not actually used yet in this changeset.
This fixes a bug where executor based drivers emit stats every second,
regardless of user configuration.
When serializing the Stats request across grpc, the nomad agent dropped
the Interval value, and then executor uses 1s as a default value.
Use secret ID for NOMAD_TOKEN as the accessor ID doesn't seem to work.
I tried with a local micro cluster following the tutorials, and if I do:
```console
$ export NOMAD_TOKEN=85310d07-9afa-ef53-0933-0c043cd673c7
```
Using the accessor ID as in this example, I get an error:
```
Error querying jobs: Unexpected response code: 403 (ACL token not found)
```
But when using the secret ID in that env var it seems to work correctly.
Introduce limits to prevent unauthorized users from exhausting all
ephemeral ports on agents:
* `{https,rpc}_handshake_timeout`
* `{http,rpc}_max_conns_per_client`
The handshake timeout closes connections that have not completed the TLS
handshake by the deadline (5s by default). For RPC connections this
timeout also separately applies to first byte being read so RPC
connections with TLS enabled have `rpc_handshake_time * 2` as their
deadline.
The connection limit per client prevents a single remote TCP peer from
exhausting all ephemeral ports. The default is 100, but can be lowered
to a minimum of 26. Since streaming RPC connections create a new TCP
connection (until MultiplexV2 is used), 20 connections are reserved for
Raft and non-streaming RPCs to prevent connection exhaustion due to
streaming RPCs.
All limits are configurable and may be disabled by setting them to `0`.
This also includes a fix that closes connections that attempt to create
TLS RPC connections recursively. While only users with valid mTLS
certificates could perform such an operation, it was added as a
safeguard to prevent programming errors before they could cause resource
exhaustion.
