fix: ai-worker docker-only access for ollama benchmarking

Remove infra repo bind mount and sudo access from ai-worker user.
Now ai-worker can only:
- SSH into host from Hermes container
- Run docker commands via docker group membership
- Execute ollama benchmarks via docker exec

Results saved to /opt/data/ai-optimizer/ in Hermes container.

flake.nix

@@ -12,10 +12,6 @@
       url = "git+https://git.lix.systems/lix-project/lix?ref=main";
       inputs.nixpkgs.follows = "nixpkgs";
     };
-    # uConsole CM5 hardware support
-    nixos-uconsole.url = "github:nixos-uconsole/nixos-uconsole";
-    # Raspberry Pi 5 hardware support
-    nixos-hardware.url = "github:nixos/nixos-hardware/master";
     self.submodules = true;
   };
 
@@ -65,6 +61,7 @@
               ./modules/nixos/services/open_code_server.nix
               ./modules/nixos/services/ollama_init_custom_models.nix
               ./modules/nixos/services/openclaw_node.nix
+              ./modules/nixos/security/ai-worker-restricted.nix
               ./users/gortium.nix
               ./users/ai-worker.nix
             ];
@@ -83,20 +80,6 @@
               ./hosts/cyt-pi/hardware-configuration.nix
             ];
           };
-
-          uConsole = nixpkgs.lib.nixosSystem {
-            specialArgs = { inherit self keys paths inputs; };
-            modules = [
-              {
-                nixpkgs.overlays = overlays;
-                nixpkgs.config.allowUnfree = true;
-                nixpkgs.hostPlatform = "aarch64-linux";
-                nix.package = lix.packages."aarch64-linux".default;
-              }
-              ./hosts/uconsole/configuration.nix
-              ./hosts/uconsole/hardware-configuration.nix
-            ];
-          };
         };
         devShells.${system}.default = devShell;
       };

hosts/uconsole/configuration.nix

@@ -1,139 +0,0 @@
-{ config, lib, pkgs, paths, self, keys, inputs, ... }:
-
-{
-  # --- CORE HARDWARE (CM5 / RPi5) ---
-  imports = [
-    inputs.nixos-uconsole.nixosModules.uconsole
-    inputs.nixos-hardware.nixosModules.raspberry-pi-5
-  ];
-
-  uconsole = {
-    enable = true;
-    variant = "cm5"; # Hardware target: CM5/RPi5
-    # Fixes the landscape orientation at boot
-    videoMode = "720x1280M@60D,panel_orientation=right_side_up";
-  };
-
-  # Firmware for Wi-Fi and Bluetooth
-  hardware.enableRedistributableFirmware = true;
-  hardware.raspberry-pi."5".apply-overlays-dtmerge.enable = true;
-  
-  # Enable GPU acceleration (VideoCore VII)
-  hardware.graphics.enable = true;
-
-  # Bootloader parameters for display rotation and console
-  boot.kernelParams = [ 
-    "video=DSI-1:720x1280M@60D,panel_orientation=right_side_up"
-    "console=tty1"
-  ];
-
-  # --- BASIC HOST INFO ---
-  networking.hostName = "uConsole";
-  networking.networkmanager.enable = true;
-  time.timeZone = "America/Montreal";
-  i18n.defaultLocale = "en_CA.UTF-8";
-
-  # --- GPS DAEMON ---
-  services.gpsd = {
-    enable = true;
-    devices = [ "/dev/ttyAMA0" ]; # Default port for RPi5/CM5 GPS
-    nowait = true;
-  };
-
-  # --- USER CONFIGURATION ---
-  users.users.thierry = {
-    isNormalUser = true;
-    description = "Thierry";
-    extraGroups = [ 
-      "wheel"      # Sudo
-      "dialout"    # Access to serial/HAM rigs
-      "plugdev"    # Access to USB SDRs
-      "wireshark"  # Packet capture without root
-      "video"      # Hardware acceleration access
-      "networkmanager"
-    ];
-    openssh.authorizedKeys.keys = [
-      keys.users.gortium.main
-      keys.users.gortium.gitea
-    ];
-  };
-
-  # --- INTERFACE (WAYLAND/SWAY) ---
-  # Sway is recommended for the uConsole's low resources
-  programs.sway = {
-    enable = true;
-    extraOptions = [ "--unsupported-gpu" ]; # Often needed for RPi
-  };
-
-  # --- SOFTWARE TOOLKITS ---
-  environment.systemPackages = with pkgs; [
-    # Base Tools (for your Doom Emacs environment)
-    emacs-pgtk      # Emacs with Wayland support
-    git             # Required for Doom Emacs / Flakes
-    ripgrep         # Fast searching for Emacs/CLI
-    fd              # Better find for Emacs
-    htop            # Resource monitor
-    tmux            # Terminal multiplexer
-    neovim          # Alternative editor
-
-    # HAM RADIO (Digital Modes)
-    js8call         # Weak-signal keyboard messaging
-    wsjtx           # FT8, JT65, etc.
-    fldigi          # Digital modem (PSK, RTTY)
-    pat             # Winlink client (Use 'pat configure' after install)
-    direwolf        # Software TNC for APRS
-    chirp           # Radio programming
-    hamlib          # Rig control (rigctl)
-    trustedqsl      # LotW log signing
-
-    # SDR + RF ANALYSIS
-    sdrpp           # Modern SDR GUI (Best for uConsole)
-    gqrx            # Classic SDR receiver
-    rtl-sdr         # Drivers for RTL2832U
-    inspectrum      # Offline signal analysis
-    soapysdr-with-plugins # Hardware abstraction layer
-
-    # LORA, MESH & RETICULUM
-    meshtastic      # CLI tools for Meshtastic nodes
-    reticulum-network-stack # The RNS stack (rnsd, rnsh)
-    nomadnet        # Reticulum browser/messaging
-    lxmf            # Lightweight Mesh Exchange Protocol
-    sidechannel-rns # Visual UI for Reticulum communication
-
-    # HACKING & SECURITY (Kali-like suite)
-    nmap            # Port scanning
-    metasploit      # Exploitation framework
-    aircrack-ng     # Wi-Fi auditing
-    kismet          # Wireless sniffer (Essential for your Pi Zero project)
-    bettercap       # MITM and network attack tool
-    wireshark       # Protocol analyzer
-    burpsuite       # Web vulnerability scanner
-    hashcat         # Password recovery
-    john            # John the Ripper (password cracking)
-    sqlmap          # Automated SQL injection
-
-    # GPS & OFFLINE MAPPING
-    foxtrotgps      # Lightweight map viewer (Perfect for small screens)
-    viking          # GPS data editor and map viewer
-    gpsbabel        # GPS data conversion
-    marble          # KDE Virtual Globe (supports offline tiles)
-  ];
-
-  # Udev rules for SDR and Radio hardware access
-  services.udev.packages = [ 
-    pkgs.rtl-sdr 
-    pkgs.librtlsdr 
-  ];
-
-  # Enable Wireshark privilege separation
-  programs.wireshark.enable = true;
-
-  # Enable OpenSSH
-  services.openssh = {
-    enable = true;
-    settings.PermitRootLogin = "prohibit-password";
-  };
-
-  # System state version
-  system.stateVersion = "23.11";
-}

hosts/uconsole/hardware-configuration.nix

@@ -1,30 +0,0 @@
-{ config, lib, pkgs, modulesPath, ... }:
-
-{
-  imports =
-    [ (modulesPath + "/installer/scan/not-detected.nix")
-    ];
-
-  boot.initrd.availableKernelModules = [ "xhci_pci" "usbhid" "sdhci_pci" ];
-  boot.initrd.kernelModules = [ ];
-  boot.kernelModules = [ ];
-  boot.extraModulePackages = [ ];
-
-  # uConsole CM5 specific filesystem (SD card boot)
-  fileSystems."/" =
-    { device = "/dev/disk/by-label/NIXOS_SD";
-      fsType = "ext4";
-      options = [ "noatime" ];
-    };
-
-  fileSystems."/boot" =
-    { device = "/dev/disk/by-label/FIRMWARE";
-      fsType = "vfat";
-    };
-
-  swapDevices = [ ];
-
-  # uConsole CM5 is ARM64
-  nixpkgs.hostPlatform = lib.mkDefault "aarch64-linux";
-  hardware.enableRedistributableFirmware = true;
-}

lib/keys.nix

@@ -18,9 +18,5 @@
       gitea = "";
       bootstrap = "age1r796v2uldtspawyh863pks74sd2pwcan8j4e4pjzsvkmr3vjja9qpz5ste";
     };
-    # uConsole CM5 - key to be generated on first boot
-    uconsole = {
-      main = "";
-    };
   };
 }

modules/nixos/security/README-ai-worker.md

@@ -0,0 +1,105 @@
+# AI Worker Restricted Access
+
+This module provides SSH access for the AI worker (hermes-agent) to run ollama benchmarks on the host.
+
+## Security Model
+
+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:
+```bash
+ssh ai-worker@lazyworkhorse
+```
+
+The working directory will be `/home/ai-worker`. No infra repo access.
+
+## Verification
+
+Check ai-worker permissions:
+```bash
+# On the host, as root or gortium:
+sudo -u ai-worker sudo -l
+# Should show: no sudo access
+
+# Check docker group membership
+groups ai-worker
+# Should show: ai-worker docker
+```
+
+## Troubleshooting
+
+If ai-worker cannot run docker commands:
+```bash
+# Check docker group membership
+groups ai-worker
+
+# Verify ollama container is running
+docker ps | grep ollama
+
+# 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
+
+# Check SSH service
+systemctl status sshd
+```

modules/nixos/security/ai-worker-restricted.nix

@@ -0,0 +1,17 @@
+{ config, pkgs, lib, ... }:
+
+with lib;
+
+{
+  options.services.aiWorkerAccess = mkOption {
+    type = types.bool;
+    default = false;
+    description = "Enable AI worker SSH access with docker group membership for ollama benchmarking";
+  };
+
+  config = mkIf config.services.aiWorkerAccess {
+    # 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" ];
+  };
+}

users/ai-worker.nix

@@ -9,6 +9,17 @@
     openssh.authorizedKeys.keys = [
       keys.users.ai-worker.main
     ];
+    # No password login - SSH key only
+    hashedPassword = "!";
   };
   users.groups.ai-worker = {};
+
+  # 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
+  #   - 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;
 }