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check the container root before each start

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atlas 2026-10-28 20:57:27 +01:00 • committed by mara
commit a44a7256a7
1 changed files with 624 additions and 12 deletions
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docs/trust-boundary/security.md
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@ -263,7 +263,7 @@ known operations; there is no arbitrary command pass-through:
| `ReloadGatewayNginx` | `systemctl reload/start/reset-failed nginx` (host unit; the unit name is hard-coded, not a parameter) |
| `WriteNspawnFlags` | write `/etc/nixos-containers/<container>.conf` (bind-mount list, network isolation vars, and `--ephemeral` after the root's salvage). hive-priv first copies a stopped container's root to the agent's `work/`, then renames it aside (it deletes nothing), following no link the container could have planted |
| `EnsureAgentSocketDir` | `mkdirat` `/run/hive-agent/<name>` `0751 root:root` under an `O_NOFOLLOW` parent fd; leaves an existing directory alone, refuses anything else |
| `WriteResourceLimits` | write `CPUQuota=`/`MemoryMax=`/`CPUWeight=`/`IOWeight=` systemd drop-in for agent container |
| `WriteResourceLimits` | write `CPUQuota=`/`MemoryMax=`/`CPUWeight=`/`IOWeight=` systemd drop-in for agent container, with an `ExecStartPre=` that runs `hive-priv check-rootfs <container>` (no-follow check of the root paths the start script touches; see persistence.md) |
| `RemoveServiceDropin` | remove `container@<name>.service.d/` drop-in on destroy |
| `DaemonReload` | `systemctl daemon-reload` |
| `ControlInfraContainer` | `systemctl <action> nginx.service` for the gateway — the `InfraContainer` enum is the allowlist, and serde rejects unknown names at the wire boundary (`hive-c0re`, the forge and the matrix have no variant, so no request can name them) |