Nomad 1.10.0 is removing the legacy Vault token based workflow
which means the legacy e2e compatibility tests will fail and not
work.
The Nomad e2e cluster was using the legacy Vault token based
workflow for initial cluster build. This change migrates to using
the workload identity flow which utilizes authentication methods,
roles, and policies.
The Nomad server network has been modified to allow traffic from
the HCP Vault HVN which is a private network peered into our AWS
account. This is required, so that Vault can pull JWKS
information from the Nomad API without going over the public
internet.
The cluster build will now also configure a Vault KV v2 mount at
a unique indentifier for the e2e cluster. This allows all Nomad
workloads and tests to use this if required.
The vaultsecrets suite has been updated to accommodate the new
changes and extended to test the default workload ID flow for
allocations which use Vault for secrets.
Although we encourage users to use Vault roles, sometimes they're going to want
to assign policies based on entity and pre-create entities and aliases based on
claims. This allows them to use single default role (or at least small number of
them) that has a templated policy, but have an escape hatch from that.
When defining Vault entities the `user_claim` must be unique. When writing Vault
binding rules for use with Nomad workload identities the binding rule won't be
able to create a 1:1 mapping because the selector language allows accessing only
a single field. The `nomad_job_id` claim isn't sufficient to uniquely identify a
job because of namespaces. It's possible to create a JWT auth role with
`bound_claims` to avoid this becoming a security problem, but this doesn't allow
for correct accounting of user claims.
Add support for an `extra_claims` block on the server's `default_identity`
blocks for Vault. This allows a cluster administrator to add a custom claim on
all allocations. The values for these claims are interpolatable with a limited
subset of fields, similar to how we interpolate the task environment.
Fixes: https://github.com/hashicorp/nomad/issues/23510
Ref: https://hashicorp.atlassian.net/browse/NET-10372
Ref: https://hashicorp.atlassian.net/browse/NET-10387
