71 lines
3.0 KiB
Nix
71 lines
3.0 KiB
Nix
{ inputs, pkgs, lib, ... }:
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{
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imports = [
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./hardware-configuration.nix
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../../configs/desktop.nix
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../../configs/qemu.nix
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../../configs/mcpkg.nix
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../../configs/mcp.nix # MCP agent + mcp user (straylight is becoming the core host)
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];
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config = {
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# straylight is the unikernel host. The shared mcp.nix locks the agent
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# down with PrivateDevices=true, which hides /dev/kvm and /dev/net/tun.
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# Relax that here (only on straylight) so the agent can boot Nanos
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# unikernel VMs under QEMU/KVM and (Phase 2) manage TAP devices.
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systemd.services.mcp-agent.serviceConfig = {
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PrivateDevices = lib.mkForce false;
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DeviceAllow = [ "/dev/kvm rw" "/dev/net/tun rw" ];
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SupplementaryGroups = [ "kvm" ];
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AmbientCapabilities = [ "CAP_NET_ADMIN" ];
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# The agent launches each unikernel as a daemonized QEMU process in its
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# own cgroup. With the default KillMode=control-group, restarting the
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# agent would SIGKILL every running VM. KillMode=process kills only the
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# agent's main process on stop/restart, so VMs survive an agent upgrade.
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# (If a VM does die, the agent's startup Recover restarts it.)
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KillMode = lib.mkForce "process";
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};
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# Let the mcp user reach /dev/kvm directly as well.
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users.users.mcp.extraGroups = [ "kvm" ];
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# Isolated host-only bridge for unikernel VMs (Phase 2). Each unikernel
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# gets a TAP on this bridge and a 10.99.0.0/24 static IP. The bridge has
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# NO uplink and NO NAT, and the firewall drops any VM traffic leaving the
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# bridge, so a VM can reach only the host gateway (10.99.0.1) -- mediation
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# is enforced by network topology, not convention.
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networking.bridges.mcp-br0.interfaces = [ ];
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networking.interfaces.mcp-br0.ipv4.addresses = [
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{ address = "10.99.0.1"; prefixLength = 24; }
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];
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# The host accepts traffic from VMs (so mc-proxy on the gateway can serve
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# them); the FORWARD drop prevents VMs from routing anywhere off-bridge.
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networking.firewall.trustedInterfaces = [ "mcp-br0" ];
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networking.firewall.extraCommands = ''
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iptables -D FORWARD -i mcp-br0 ! -o mcp-br0 -j DROP 2>/dev/null || true
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iptables -A FORWARD -i mcp-br0 ! -o mcp-br0 -j DROP
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'';
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networking.firewall.extraStopCommands = ''
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iptables -D FORWARD -i mcp-br0 ! -o mcp-br0 -j DROP 2>/dev/null || true
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'';
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# Allow rootless containers (podman) to bind low ports (53 for MCNS,
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# 443/8443/9443 for mc-proxy) as straylight takes over the core role.
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boot.kernel.sysctl."net.ipv4.ip_unprivileged_port_start" = 53;
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# Open ports: DNS (53), mc-proxy (443/8443/9443), agent (9444), master (9555).
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networking.firewall.allowedTCPPorts = [ 53 443 8443 9443 9444 9555 ];
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networking.firewall.allowedUDPPorts = [ 53 ];
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# DNS: MCNS for internal zones, public resolvers as fallback.
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networking.nameservers = [
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"192.168.88.181"
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"100.95.252.120"
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"1.1.1.1"
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"8.8.8.8"
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];
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services.resolved.domains = [
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"~mcp.metacircular.net"
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];
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};
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}
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