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.

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

@@ -1,54 +1,62 @@
 # AI Worker Restricted Access
 
-This module provides restricted access for the AI worker (hermes-agent) to manage the infra repository.
+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
-- **Bind mount**: `/home/ai-worker/infra` → `/home/gortium/infra` (read-write)
-- **Cannot access**: Any other files outside the bind mount and standard system paths
+- **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 (Whitelist Only)
-The following commands are allowed via sudo without password:
-- `/run/current-system/sw/bin/nh` - NixOS home manager
-- `/run/current-system/sw/bin/nixos-rebuild` - System rebuild
-- `/run/current-system/sw/bin/nixpkgs-fmt` - Nix formatter
-- `/run/current-system/sw/bin/nix` - Nix package manager
+### 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 manage containers
-- Cannot modify host system directly
+- 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
 
-### Audit Logging
-- All changes to `/home/gortium/infra` are logged via Linux audit subsystem
-- Audit rule: `-w /home/gortium/infra -p wa -k infra_changes`
+## Workflow: SSH + Docker Benchmarking
 
-## Workflow: Ask First, Always
-
-**CRITICAL**: Before running any deployment command (`nh os switch` or `nixos-rebuild`), the AI MUST:
-
-1. **Show the planned changes** to the user
-2. **Explain the impact** of the changes
-3. **Wait for explicit confirmation** before executing
+The AI worker connects from the Hermes container to the host via SSH, runs ollama benchmarks, then returns to save results.
 
 ### Example Workflow
 
 ```bash
-# AI prepares changes
-cd /home/ai-worker/infra
-# ... edits files ...
-nixpkgs-fmt .
+# From Hermes container, SSH to host
+ssh -i /path/to/ssh/key ai-worker@host.docker.internal
 
-# AI shows diff to user
-git diff
+# On host, run ollama benchmarks via docker
+docker exec ollama ollama pull devstral-small-2:24b
 
-# AI asks: "Ready to deploy? This will restart the ai_stack service."
-# User responds: "Yes, proceed"
+# 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'
 
-# Only then does AI run:
-sudo nh os switch --flake .#lazyworkhorse
+# 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
@@ -58,7 +66,7 @@ Connect as:
 ssh ai-worker@lazyworkhorse
 ```
 
-The working directory will be `/home/ai-worker`, with infra repo accessible at `/home/ai-worker/infra`.
+The working directory will be `/home/ai-worker`. No infra repo access.
 
 ## Verification
 
@@ -66,27 +74,32 @@ Check ai-worker permissions:
 ```bash
 # On the host, as root or gortium:
 sudo -u ai-worker sudo -l
-```
+# Should show: no sudo access
 
-Expected output should show only the whitelisted commands.
+# Check docker group membership
+groups ai-worker
+# Should show: ai-worker docker
+```
 
 ## Troubleshooting
 
-If ai-worker cannot access infra:
+If ai-worker cannot run docker commands:
 ```bash
-# Check bind mount
-mount | grep ai-worker/infra
+# Check docker group membership
+groups ai-worker
 
-# Check permissions
-ls -la /home/gortium/infra
-ls -la /home/ai-worker/infra
+# Verify ollama container is running
+docker ps | grep ollama
+
+# Test docker access
+sudo -u ai-worker docker exec ollama ollama list
 ```
 
-If sudo commands fail:
+If SSH connection fails:
 ```bash
-# Check sudo rules
-sudo cat /etc/sudoers.d/* | grep ai-worker
+# Check SSH key is authorized
+cat /home/ai-worker/.ssh/authorized_keys
 
-# Check audit logs
-sudo ausearch -k infra_changes
+# Check SSH service
+systemctl status sshd
 ```

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

@@ -6,52 +6,12 @@ with lib;
   options.services.aiWorkerAccess = mkOption {
     type = types.bool;
     default = false;
-    description = "Enable restricted AI worker access to infra repo with deployment capabilities";
+    description = "Enable AI worker SSH access with docker group membership for ollama benchmarking";
   };
 
   config = mkIf config.services.aiWorkerAccess {
-    # Bind mount for infra repo access (read-write for editing)
-    fileSystems."/home/ai-worker/infra" = {
-      device = "/home/gortium/infra";
-      fsType = "none";
-      options = [ "bind" ];
-    };
-
-    # Restricted sudo access - only specific commands allowed
-    security.sudo.extraRules = [
-      {
-        users = [ "ai-worker" ];
-        commands = [
-          {
-            command = "/run/current-system/sw/bin/nh";
-            options = [ "NOPASSWD" ];
-          }
-          {
-            command = "/run/current-system/sw/bin/nixos-rebuild";
-            options = [ "NOPASSWD" ];
-          }
-          {
-            command = "/run/current-system/sw/bin/nixpkgs-fmt";
-            options = [ "NOPASSWD" ];
-          }
-          {
-            command = "/run/current-system/sw/bin/nix";
-            options = [ "NOPASSWD" ];
-          }
-        ];
-      }
-    ];
-
-    # Ensure ai-worker has necessary tools available
-    environment.systemPackages = with pkgs; [
-      nh
-      nixpkgs-fmt
-    ];
-
-    # Audit logging for ai-worker actions on infra directory
-    security.audit.enable = mkDefault true;
-    security.audit.rules = [
-      "-w /home/gortium/infra -p wa -k infra_changes"
-    ];
+    # 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

@@ -14,12 +14,12 @@
   };
   users.groups.ai-worker = {};
 
-  # Enable restricted AI worker access with deployment capabilities
+  # Enable restricted AI worker SSH access for ollama benchmarking
   # SECURITY: ai-worker can only:
-  #   - Access /home/ai-worker/infra (bind-mounted to /home/gortium/infra)
-  #   - Run: nh, nixos-rebuild, nixpkgs-fmt, nix (via sudo, no password)
-  #   - Manage docker containers (via docker group)
-  #   - All changes to infra/ are logged via audit subsystem
-  # WORKFLOW: AI must ask for user confirmation before running nh os switch
+  #   - 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;
 }