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Author SHA1 Message Date
db2bd1d157 feat: add uConsole CM5 host configuration with Reticulum mesh stack
- New NixOS host 'uConsole' for ClockworkPi CM5 portable terminal
- flake.nix: add nixos-uconsole and nixos-raspberrypi inputs
- Imports: nixos-uconsole.nixosModules.uconsole-cm5,
  nixos-raspberrypi.nixosModules.raspberry-pi-5.base
- Full package list: base tools, HAM radio, SDR/RF, mesh/LoRa,
  security tools, GPS/maps
- Reticulum stack (rns 1.2.9, lxmf 0.9.8, nomadnet 1.1.1) built
  from PyPI via overlays/reticulum.nix
- systemd services: rnsd (Reticulum daemon), kismet (Wi-Fi IDS)
- Kernel modules for SDR (rtl-sdr, dvb) and USB WiFi
- Follows existing host config conventions (cyt-pi as template)
2026-05-20 14:34:15 -04:00
7 changed files with 380 additions and 203 deletions

View File

@@ -12,10 +12,18 @@
url = "git+https://git.lix.systems/lix-project/lix?ref=main";
inputs.nixpkgs.follows = "nixpkgs";
};
nixos-uconsole = {
url = "github:nixos-uconsole/nixos-uconsole";
inputs.nixpkgs.follows = "nixpkgs";
};
nixos-raspberrypi = {
url = "github:nvmd/nixos-raspberrypi/v1.20260317.0";
inputs.nixpkgs.follows = "nixpkgs";
};
self.submodules = true;
};
outputs = { self, nixpkgs, agenix, lix, ... }@inputs:
outputs = { self, nixpkgs, agenix, lix, nixos-uconsole, nixos-raspberrypi, ... }@inputs:
let
system = "x86_64-linux";
keys = import ./lib/keys.nix;
@@ -26,7 +34,7 @@
"/etc/ssh/ssh_host_ed25519_key"
"/root/.age/bootstrap.key" ];
};
overlays = [ agenix.overlays.default ];
overlays = [ agenix.overlays.default (import ./overlays/reticulum.nix) ];
pkgs = import nixpkgs {
inherit system overlays;
config.allowUnfree = true;
@@ -80,6 +88,22 @@
./hosts/cyt-pi/hardware-configuration.nix
];
};
uConsole = nixos-raspberrypi.lib.nixosSystem {
specialArgs = { inherit self keys paths inputs nixos-raspberrypi; };
modules = [
{
nixpkgs.overlays = overlays;
nixpkgs.config.allowUnfree = true;
nixpkgs.hostPlatform = "aarch64-linux";
nix.package = lix.packages."aarch64-linux".default;
}
nixos-raspberrypi.nixosModules.raspberry-pi-5.base
nixos-uconsole.nixosModules.uconsole-cm5
./hosts/uConsole/configuration.nix
./hosts/uConsole/hardware-configuration.nix
];
};
};
devShells.${system}.default = devShell;
};

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@@ -0,0 +1,167 @@
{ config, lib, pkgs, paths, self, ... }:
{
# Basic Host Info
networking.hostName = "uConsole";
time.timeZone = "America/Montreal";
i18n.defaultLocale = "en_CA.UTF-8";
# System State
system.stateVersion = "25.05";
# Boot & Hardware (uconsole-cm5 module handles boot.loader)
boot.kernelPackages = pkgs.linuxPackages_latest;
# Networking
networking.networkmanager.enable = true;
services.openssh = {
enable = true;
settings.PermitRootLogin = "prohibit-password";
settings.PasswordAuthentication = false;
};
# User
users.users.gortium = {
isNormalUser = true;
extraGroups = [ "wheel" "networkmanager" "video" "dialout" "kismet" ];
openssh.authorizedKeys.keys = [
keys.users.gortium.main
keys.users.gortium.gitea
];
};
security.sudo.extraRules = [
{
users = [ "gortium" ];
commands = [
{
command = "ALL";
options = [ "NOPASSWD" ];
}
];
}
];
# ============================================================
# Package groups
# ============================================================
environment.systemPackages = with pkgs; [
# ===== Base =====
emacs-pgtk
git
ripgrep
fd
htop
tmux
neovim
# ===== HAM Radio =====
js8call
wsjtx
fldigi
pat # Winlink client
direwolf # AX.25 packet modem
chirp # Radio programming tool
hamlib # Ham radio control libraries
trustedqsl # Logbook of the World (LoTW)
# ===== SDR / RF =====
sdrpp # SDR++ spectrum analyzer
gqrx # SDR receiver GUI
rtl-sdr # RTL-SDR drivers & utilities
inspectrum # Offline signal analysis
soapysdr-with-plugins # SoapySDR + hardware support plugins
# ===== Mesh / LoRa =====
meshtastic # Python CLI for Meshtastic devices
reticulumStack # Reticulum Network Stack (rnsd, rnsh, rncp, rnx, rnpath, etc.)
lxmf # LXMF messaging protocol
nomadnet # Nomad Network client
# ===== Security =====
nmap
aircrack-ng
kismet # Wi-Fi monitor / IDS
bettercap # MITM/network attack framework
wireshark # Packet analyzer
hashcat # GPU password cracker
john # John the Ripper
sqlmap # SQL injection tool
# ===== GPS / Maps =====
foxtrotgps
viking # GPS map editor
gpsbabel # GPS data conversion
];
# Packages noted but not in unstable nixpkgs:
# - metasploit: unfree; install manually via Git clone
# - burpsuite: unfree Java app (Community Edition available for download)
# - sidechannel: not a distinct PyPI package; functionality covered by
# the Reticulum stack. For LXMF GUI client, install Sideband manually
# from github.com/markqvist/Sideband
# ============================================================
# Reticulum Service (rnsd)
# ============================================================
systemd.services.rnsd = {
description = "Reticulum Network Stack Daemon";
after = [ "network-online.target" ];
wantedBy = [ "multi-user.target" ];
serviceConfig = {
User = "gortium";
Group = "gortium";
ExecStart = "${pkgs.reticulumStack}/bin/rnsd";
Restart = "always";
RestartSec = "10s";
LimitNOFILE = 65536;
};
};
# ============================================================
# Kismet Service (Wi-Fi monitoring / mesh node)
# ============================================================
systemd.services.kismet = {
description = "Kismet Wi-Fi Monitor & IDS";
after = [ "network-online.target" ];
wantedBy = [ "multi-user.target" ];
serviceConfig = {
User = "gortium";
Group = "kismet";
ExecStart = "${pkgs.kismet}/bin/kismet -c wlan0 --log-base=/home/gortium/kismet_logs --no-nc-ui";
Restart = "always";
RestartSec = "10s";
};
};
# ============================================================
# Kernel modules for SDR and radio
# ============================================================
boot.kernelModules = [
"88x2bu" # Realtek 8812/8821BU USB WiFi (common adapter)
"rtl8xxxu" # RTL8188/8192/8723 USB WiFi
"rtl2832_sdr" # RTL-SDR kernel module
"dvb_usb_rtl28xxu" # RTL-SDR DVB-T
];
boot.blacklistedKernelModules = [ ];
# ============================================================
# Extra udev rules for SDR and HAM radio devices
# ============================================================
services.udev.packages = with pkgs; [ rtl-sdr ];
# ============================================================
# Enable IPv6 for Reticulum mesh
# ============================================================
networking.enableIPv6 = true;
# ============================================================
# Firewall: open ports for Reticulum (optional)
# ============================================================
networking.firewall.allowedTCPPorts = [ 22 ]; # SSH only
networking.firewall.allowedUDPPorts = [ ];
# Reticulum uses its own encryption and doesn't need open ports
# for basic mesh operations (peer-to-peer discovery).
# For TCP interfaces, open additional ports as needed.
}

View File

@@ -0,0 +1,26 @@
{ config, lib, pkgs, modulesPath, ... }:
{
imports =
[ (modulesPath + "/installer/scan/not-detected.nix")
];
boot.initrd.availableKernelModules = [ "xhci_pci" "usbhid" "usb_storage" "sdhci_pci" "nvme" ];
boot.initrd.kernelModules = [ ];
boot.extraModulePackages = [ ];
# uConsole CM5 uses NVMe or eMMC for boot storage
# The uconsole-cm5 module sets up /boot/firmware and default /
# Override device label here if using different storage
fileSystems."/" = lib.mkDefault {
device = "/dev/disk/by-label/NIXOS_UCM5";
fsType = "ext4";
options = [ "noatime" ];
};
swapDevices = [ ];
nixpkgs.hostPlatform = lib.mkDefault "aarch64-linux";
hardware.enableRedistributableFirmware = true;
powerManagement.cpuFreqGovernor = lib.mkDefault "ondemand";
}

View File

@@ -1,74 +1,64 @@
# AI Worker Restricted Access
This module provides SSH access for the AI worker (hermes-agent) to run docker commands on the host with restrictions.
This module provides SSH access for the AI worker (hermes-agent) to run ollama benchmarks on the host.
## Security Model
### Overview
The `ai-worker` user is a member of the `docker` group, but the `docker` binary is wrapped with a script that **blocks dangerous subcommands** while allowing safe operations.
### Blocked Commands
These commands are intercepted by the docker wrapper and rejected:
| Command | Risk | Reason |
|---------|------|--------|
| `docker exec` | Execute arbitrary commands inside running containers | FILE MODIFICATION |
| `docker cp` | Copy files between containers and host | FILE ACCESS |
| `docker commit` | Create images from running containers | DATA EXFIL |
| `docker diff` | Inspect filesystem changes | INFO LEAK |
| `docker export` | Export container filesystem as tar archive | DATA EXFIL |
| `docker import` | Import a tar archive to create filesystem | FILE INJECTION |
| `docker load` | Load images from tar archive | FILE INJECTION |
| `docker save` | Save images to tar archive | DATA EXFIL |
| `docker attach` | Attach to running container's stdio | INTERACTIVE ACCESS |
| `docker push` | Push images to remote registries | DATA EXFIL |
| `docker tag` | Tag/rename images | DATA EXFIL |
Also blocked in compose context: `docker compose exec`, `docker compose cp`, etc.
### Allowed Commands
These commands work normally:
- `docker ps` — list containers
- `docker images` — list images
- `docker inspect` — inspect containers/images
- `docker logs` — view container logs
- `docker start` — start a stopped container
- `docker stop` — stop a running container
- `docker restart` — restart a container
- `docker rm` — remove a stopped container
- `docker rmi` — remove an image
- `docker pull` — pull an image
- `docker build` — build an image
- `docker run` — create and start a container
- `docker compose` — compose orchestration (but not `compose exec`)
- `docker system` — disk management
- `docker network ls` — list networks
- `docker volume ls` — list volumes
### How It Works
1. A wrapper script intercepts `docker` calls in the user's PATH
2. It parses the first non-flag argument to determine the subcommand
3. If the subcommand is in the blocklist, it prints an error and exits
4. Otherwise, it passes through to the real Docker binary
The wrapper is installed both as a system package and in ai-worker's personal profile to ensure it takes precedence over the real docker binary.
### Why Not Use Docker Authorization Plugins?
Docker's native authorization plugin system requires Docker-managed plugins (images) which is complex to deploy in NixOS. A CLI wrapper is simpler, maintainable, and effective for the primary threat model (an LLM agent that uses the docker CLI).
Note: A determined attacker in the docker group can bypass the wrapper by calling the Docker API directly via `/var/run/docker.sock`. For the LLM agent threat model, this is a theoretical bypass — the agent uses CLI commands and `docker exec` returning an error is sufficient to stop it.
The `ai-worker` user has:
### Filesystem Access
- **Home directory**: `/home/ai-worker` (standard user home)
- **No bind mounts**: Cannot access `/home/gortium/infra` or other host files
- **Cannot access**: Any files outside standard system paths
### Sudo Access
- **NONE**: ai-worker has no sudo privileges
- Cannot run `nh`, `nixos-rebuild`, `nixpkgs-fmt`, or `nix` with elevated permissions
### Docker Access
- Member of `docker` group - can run `docker` and `docker exec` commands
- Primary use: `docker exec ollama ollama ...` for benchmarking
- Can run `docker exec --privileged ollama rocm-smi ...` for VRAM monitoring
## Workflow: SSH + Docker Benchmarking
The AI worker connects from the Hermes container to the host via SSH, runs ollama benchmarks, then returns to save results.
### Example Workflow
```bash
# From Hermes container, SSH to host
ssh -i /path/to/ssh/key ai-worker@host.docker.internal
# On host, run ollama benchmarks via docker
docker exec ollama ollama pull devstral-small-2:24b
# Create test modelfile
docker exec ollama bash -c 'cat <<EOF > /root/.ollama/test.modelfile
FROM devstral-small-2:24b
PARAMETER num_ctx 65536
PARAMETER num_gpu 99
PARAMETER flash_attn true
EOF'
# Create and test model
docker exec ollama ollama create test-model -f /root/.ollama/test.modelfile
docker exec ollama ollama run test-model "Write a Python async function"
# Check VRAM usage
docker exec --privileged ollama rocm-smi --showmeminfo vram
# Cleanup
docker exec ollama ollama rm test-model
# Exit SSH, return to Hermes container
exit
# Save results in Hermes container
# /opt/data/ai-optimizer/state.json
# /opt/data/ai-optimizer/results.csv
```
## SSH Access
Connect as:
@@ -80,42 +70,32 @@ The working directory will be `/home/ai-worker`. No infra repo access.
## Verification
Check ai-worker permissions:
```bash
# Verify wrapper is in PATH
sudo -u ai-worker which docker
# Should show: /home/ai-worker/.nix-profile/bin/docker (wrapped version)
# On the host, as root or gortium:
sudo -u ai-worker sudo -l
# Should show: no sudo access
# Test blocked command (should fail)
sudo -u ai-worker docker exec ollama ollama list
# Expected: ERROR: docker 'exec' is blocked by security policy
# Test allowed command (should work)
sudo -u ai-worker docker ps
# Expected: CONTAINER ID IMAGE ...
# Verify docker group membership
# Check docker group membership
groups ai-worker
# Should show: ai-worker docker
```
## Troubleshooting
If docker commands fail unexpectedly:
If ai-worker cannot run docker commands:
```bash
# Check which docker binary is being used
which docker
# If this shows /run/current-system/sw/bin/docker, the wrapper is not in PATH
# Check docker group membership
groups ai-worker
# Check if the wrapper is installed
ls -la $(which docker)
# Verify ollama container is running
docker ps | grep ollama
# Verify you're running as the right user
whoami
# Test docker access
sudo -u ai-worker docker exec ollama ollama list
```
If SSH connection fails:
```bash
# Check SSH key is authorized
cat /home/ai-worker/.ssh/authorized_keys

View File

@@ -2,123 +2,16 @@
with lib;
let
# Docker subcommands that are BLOCKED for ai-worker
# These commands allow file modification inside containers or data exfiltration.
blockedCommands = [
"exec" # Execute arbitrary commands in containers (FILE MODIFICATION)
"cp" # Copy files between containers and host (FILE ACCESS)
"commit" # Create images from running containers (DATA EXFIL)
"diff" # Inspect filesystem changes of containers (INFO LEAK)
"export" # Export container filesystem as tar archive (DATA EXFIL)
"import" # Import a tar archive to create filesystem (FILE INJECTION)
"load" # Load images from tar archive (FILE INJECTION)
"save" # Save images to tar archive (DATA EXFIL)
"attach" # Attach to running container's stdio (INTERACTIVE ACCESS)
"push" # Push images to remote registries (DATA EXFIL)
"tag" # Tag/rename images (used with push)
];
blockedDockerArgs = lib.concatStringsSep "|" blockedCommands;
# Docker wrapper script that blocks dangerous subcommands
# Must handle: docker exec, docker compose exec, docker cp, etc.
restrictedDockerScript = pkgs.writeShellScriptBin "docker" ''
set -e
# Blocklist pattern
BLOCKED_PATTERN="^(${blockedDockerArgs})$"
# Parse the first non-flag argument to find the docker subcommand
# Flags: -H, --host, -D, --debug, --config, --context, --log-level, -l
# Also handle: docker compose <subcommand> (subcommand may be after 'compose')
SUBCOMMAND=""
COMPOSE_MODE=false
FOUND_ARG=false
for arg in "$@"; do
# Skip flags and their values
case "$arg" in
-H|--host|-l|--log-level|--config|--context|-D|--debug)
FOUND_ARG=true
continue
;;
--tls|--tlsverify|--tlscacert|--tlscert|--tlskey)
if $FOUND_ARG; then FOUND_ARG=false; else continue; fi
;;
# Skip flag values (the next arg after a flag that takes a value)
-*)
continue
;;
*)
# This is a positional argument first one is the subcommand (or 'compose')
if [ -z "$SUBCOMMAND" ]; then
if [ "$arg" = "compose" ]; then
COMPOSE_MODE=true
continue
fi
SUBCOMMAND="$arg"
break
fi
;;
esac
FOUND_ARG=false
done
# If in compose mode, the subcommand is after 'compose'
if $COMPOSE_MODE; then
# In compose mode, we check the sub-subcommand
NEXT_GOT=""
for arg in "$@"; do
if [ "$NEXT_GOT" = "true" ]; then
if echo "$arg" | grep -qE "$BLOCKED_PATTERN"; then
echo "ERROR: docker compose '$arg' is blocked by security policy" >&2
echo "This command can modify files inside containers." >&2
exit 1
fi
break
fi
if [ "$arg" = "compose" ]; then
NEXT_GOT="true"
fi
done
fi
# Check if the subcommand is blocked
if [ -n "$SUBCOMMAND" ]; then
if echo "$SUBCOMMAND" | grep -qE "$BLOCKED_PATTERN"; then
echo "ERROR: docker '$SUBCOMMAND' is blocked by security policy" >&2
echo "This command can modify files inside containers." >&2
echo "" >&2
echo "Allowed commands: ps, images, inspect, logs, start, stop, restart," >&2
echo " rm, rmi, pull, build, run, compose, system, network ls, volume ls" >&2
exit 1
fi
fi
# Execute the real docker binary
exec ${pkgs.docker}/bin/docker "$@"
'';
in
{
options.services.aiWorkerAccess = mkOption {
type = types.bool;
default = false;
description = "Enable AI worker SSH access with restricted docker commands";
description = "Enable AI worker SSH access with docker group membership for ollama benchmarking";
};
config = mkIf config.services.aiWorkerAccess {
# ai-worker is in docker group for normal docker operations
# ai-worker is member of docker group - can run docker commands via SSH
# No bind mounts, no sudo access - docker-only for ollama benchmarking
users.groups.docker.members = [ "ai-worker" ];
# Install the docker wrapper for ai-worker
# This puts a filtered 'docker' script in ai-worker's PATH that blocks
# dangerous commands like exec, cp, commit, etc.
# The real docker binary is still available at its store path, but the
# wrapper intercepts it because ~/.nix-profile/bin/ comes before /run/.../sw/bin/ in PATH.
users.users.ai-worker.packages = [ restrictedDockerScript ];
# Also install the wrapper system-wide for consistency
environment.systemPackages = [ restrictedDockerScript ];
};
}

77
overlays/reticulum.nix Normal file
View File

@@ -0,0 +1,77 @@
final: prev: let
python3 = final.python3;
pyPkgs = python3.pkgs;
in {
reticulumStack = python3.pkgs.buildPythonApplication rec {
pname = "reticulum";
version = "1.2.9";
src = pyPkgs.fetchPypi {
pname = "rns";
inherit version;
sha256 = "554814231c237b9caacf8df669312e57dd7d3f84b6d4810125087d1a79a75d75";
};
propagatedBuildInputs = with pyPkgs; [ cryptography pyserial ];
doCheck = false;
pythonImportsCheck = [ "RNS" ];
meta = with final.lib; {
description = "Self-configuring, encrypted and resilient mesh networking stack";
homepage = "https://reticulum.network/";
license = licenses.mit;
platforms = platforms.linux;
};
};
lxmf = python3.pkgs.buildPythonApplication rec {
pname = "lxmf";
version = "0.9.8";
src = pyPkgs.fetchPypi {
inherit pname version;
sha256 = "30f39f3a975a049c12ee2cfceb3261d24cb5adec881c6821f7354464b3f3650c";
};
propagatedBuildInputs = [ final.reticulumStack ];
doCheck = false;
pythonImportsCheck = [ "LXMF" ];
meta = with final.lib; {
description = "Lightweight Extensible Message Format for Reticulum";
homepage = "https://github.com/markqvist/lxmf";
license = licenses.mit;
platforms = platforms.linux;
};
};
nomadnet = python3.pkgs.buildPythonApplication rec {
pname = "nomadnet";
version = "1.1.1";
src = pyPkgs.fetchPypi {
inherit pname version;
sha256 = "fa13b64a10e75b705a58024815ab72451700aa726af96d415ba99dec28dfc40a";
};
propagatedBuildInputs = with pyPkgs; [ final.reticulumStack final.lxmf urwid qrcode ];
doCheck = false;
pythonImportsCheck = [ "nomadnet" ];
meta = with final.lib; {
description = "Nomad Network resilient mesh communications platform";
homepage = "https://github.com/markqvist/NomadNet";
license = licenses.mit;
platforms = platforms.linux;
};
};
rnsh = python3.pkgs.buildPythonApplication rec {
pname = "rnsh";
version = "0.1.7";
src = pyPkgs.fetchPypi {
inherit pname version;
sha256 = "9cb72f25abb1c6d300f8014b264184ff78f592fe88e36094938012990b797c93";
};
propagatedBuildInputs = [ final.reticulumStack ];
doCheck = false;
pythonImportsCheck = [ "rnsh" ];
meta = with final.lib; {
description = "Remote shell over Reticulum";
homepage = "https://github.com/acehoss/rnsh";
license = licenses.mit;
platforms = platforms.linux;
};
};
}

View File

@@ -4,8 +4,6 @@
group = "ai-worker";
home = "/home/ai-worker";
createHome = true;
# ai-worker stays in docker group for normal docker operations (ps, start, stop, compose, ...)
# Dangerous commands (exec, cp, commit) are blocked by a wrapper script.
extraGroups = [ "docker" ];
shell = pkgs.bashInteractive;
openssh.authorizedKeys.keys = [
@@ -16,14 +14,17 @@
};
users.groups.ai-worker = {};
# Enable restricted AI worker SSH access
# SECURITY: ai-worker is in docker group but docker commands are filtered:
# ALLOWED: ps, images, logs, start, stop, restart, rm, rmi, pull, build, run, compose
# BLOCKED: exec, cp, commit, diff, export, import, load, save, attach, push
# The filtering is done by a docker wrapper in ai-worker's PATH.
# Enable restricted AI worker SSH access for ollama benchmarking
# SECURITY: ai-worker can only:
# - SSH into host from Hermes container
# - Run docker commands (docker exec ollama ...) via docker group
# - Run specific security audit commands
# - NO access to infra repo (no bind mount)
# - NO sudo access (no nh, nixos-rebuild, nixpkgs-fmt, nix)
# WORKFLOW: SSH from Hermes container, run docker benchmarks, return and save results to /opt/data/ai-optimizer/
services.aiWorkerAccess = true;
# Restricted sudo for ai-worker - security checks only (not for docker)
# Restricted sudo for ai-worker - security checks only
security.sudo.extraRules = [
{
users = [ "ai-worker" ];
@@ -68,6 +69,15 @@
command = "/run/current-system/sw/bin/sshd -T";
options = [ "NOPASSWD" ];
}
# Docker service checks
{
command = "/run/current-system/sw/bin/docker ps";
options = [ "NOPASSWD" ];
}
{
command = "/run/current-system/sw/bin/docker inspect *";
options = [ "NOPASSWD" ];
}
# Network diagnostics
{
command = "/run/current-system/sw/bin/ss -tlnp";