Adds opt-in HTTP Basic auth to the hive-gateway backed by the host PAM
stack + group membership check.
New binary `hive-gateway-auth` (hive-c0re workspace):
- Axum HTTP service on 127.0.0.1:7002 (host loopback)
- Decodes Basic credentials, authenticates via pam_unix.so
- Checks membership in `hyperhive-operator` group (or custom)
- Returns 200 / 401 / 403; nginx `auth_request` consumes these
New options under `services.hyperhive.gateway.auth`:
- `enable` — off by default
- `port` — auth service port (default 7002)
- `realm` — WWW-Authenticate realm string (default "hyperhive")
- `group` — required host group (default "hyperhive-operator")
- `pamService` — PAM service name (default "hive-gateway")
Host-side NixOS wiring:
- `users.groups.hyperhive-operator` declared when default group used
- `/etc/pam.d/hive-gateway` emitted via `security.pam.services`
- `systemd.services.hive-gateway-auth` runs the auth binary as root
(needs /etc/shadow access for pam_unix.so)
Gateway container nginx wiring:
- `location = /__hive_gateway_auth` — internal proxy to auth service
- `auth_request /__hive_gateway_auth` on the `"/"` proxy location
- `@hive_auth_required` named location adds WWW-Authenticate: Basic
header on 401 so browsers display a login prompt
Workspace deps: pam = "0.8"; flake.nix: linux-pam added to
nativeBuildInputs so pkg-config can find libpam at build time.
d4409b27a3