Emma Thorpe
ff5fe16728
CI / flake (pull_request) Successful in 3m30s
- flake.nix: drop the dead "lens" unfree entry; pkgs.lens is named "lens-desktop", which is the name the predicate actually matches. - home/README.md: the Nix LSP is nil_ls, not nil. - .editorconfig: remove the rule block that duplicated the [*] defaults. - hosts/RPi5/docker.nix: name the trusted Docker subnet in a let binding rather than repeating the literal CIDR. Deferred from the audit bundle: the .gitignore firmware entry (documented, low value) and the per-eval nixpkgs-unstable overlay import (inherently per-system, no clean hoist). Closes #53
39 lines
1.8 KiB
Nix
39 lines
1.8 KiB
Nix
# Docker host with the daemon socket exposed over the network.
|
|
#
|
|
# SECURITY: the daemon listens on plain TCP 2375 with NO TLS and NO auth. Access
|
|
# to that port is root-equivalent on this host (the Docker API can mount the
|
|
# host filesystem and run privileged containers). The ONLY thing protecting it
|
|
# is the nftables rule below, which accepts 2375 solely from the trusted LAN
|
|
# subnet. Do not widen that subnet to anything you do not fully trust. The
|
|
# secure upgrade path is mutual TLS on 2376 (--tlsverify with client certs);
|
|
# that needs out-of-band cert provisioning and is intentionally not wired here.
|
|
{ ... }:
|
|
let
|
|
# LAN allowed to reach the unauthenticated Docker TCP socket (see SECURITY above).
|
|
trustedSubnet = "10.187.1.0/24";
|
|
in
|
|
{
|
|
virtualisation.docker.enable = true;
|
|
|
|
# Expose the daemon over TCP by extending systemd socket activation rather than
|
|
# setting daemon.settings.hosts. The NixOS docker unit starts dockerd with
|
|
# `-H fd://` and takes its listeners from this socket; putting `hosts` in
|
|
# daemon.json as well would conflict with that and dockerd would refuse to
|
|
# start. Adding the TCP listener here keeps a single source of truth.
|
|
# The leading "" resets the unit's default (unix-socket-only) ListenStream list.
|
|
systemd.sockets.docker.socketConfig.ListenStream = [
|
|
""
|
|
"/run/docker.sock"
|
|
"0.0.0.0:2375"
|
|
];
|
|
|
|
# Source-restricted firewall rule for the Docker TCP port. 2375 is deliberately
|
|
# NOT added to networking.firewall.allowedTCPPorts (that would open it to every
|
|
# source); instead nftables accepts it only from the trusted subnet. Adjust the
|
|
# CIDR to match the LAN that should reach the Docker API.
|
|
networking.nftables.enable = true;
|
|
networking.firewall.extraInputRules = ''
|
|
ip saddr ${trustedSubnet} tcp dport 2375 accept
|
|
'';
|
|
}
|