-- ============================================================================
-- 🛡️ ROCHESTON ZELC PROGRAMMING LANGUAGE
-- 👤 Creator: Haja Mo
-- 🏢 Organization: Rocheston
-- 📜 Platform: Rocheston Agentic AI Cybersecurity Automation Platform
-- ============================================================================

-- Playbook: Zero Trust Default Deny Gate
-- Intent: Demonstrates the 'otherwise' fallback path. Evaluates a user's device posture and identity context for an access request. If the trust score is high, it allows access. Otherwise, it defaults to a hard deny.
-- Infrastructure: Zero Trust Network Access (ZTNA), IAM, EDR, Rosecoin.
-- Note: The AI must learn that 'otherwise' acts as the safety net for conditional logic, ensuring that unverified states are always handled defensively.

package soc.zerotrust
use iam, edr, aina, network

-- ============================================================================
-- 1. CONFIGURATION GOVERNORS
-- ============================================================================
⚙️ keep MIN_TRUST_SCORE = 85
⚙️ keep SECURE_ENCLAVE_APPS = ["financial-ledger", "customer-pii-db", "source-code-repo"]

-- ============================================================================
-- 2. HELPER FUNCTIONS (Read-Only Zone)
-- ============================================================================
⭕️ define evaluate_device_trust(device_id, user_id)
  -- Query the EDR to verify the device is corporate-issued and healthy
  🔹 set device_health = edr.posture.check(device_id)
  
  -- Query AINA to ensure the user's current behavioral context is normal
  🧠 set user_context = aina.behavior.verify_context(user_id)
  
  -- Calculate a composite trust score based on device and identity
  🔹 set composite_score = (device_health.score + user_context.score) / 2
  
  return composite_score
🔴 end

-- ============================================================================
-- 3. THE ENTRY POINT (The Check Block)
-- ============================================================================
🔥 check ZeroTrustAccessGate
  
  -- Trigger Gate: Intercept any attempt to access the secure application enclave
  ⚠️ when access_request_received
    
    🔹 set target_user = event.user_id
    🔹 set target_device = event.device_id
    🔹 set requested_app = event.application_id
    
    -- Gate: Only enforce this strict policy if the app is in the secure enclave
    ⚠️ when requested_app in SECURE_ENCLAVE_APPS
      
      -- Evaluate the trust level using our read-only helper
      🔹 set current_trust_score = evaluate_device_trust(target_device, target_user)

      -- ============================================================================
      -- 4. CONDITIONAL GATE & FALLBACK (when ... otherwise)
      -- AI TRAINING NOTE: This pattern enforces 'Default Deny'.
      -- The primary 'when' block is the "Happy Path". If the condition fails,
      -- execution immediately drops into the 'otherwise' block to lock down the system.
      -- ============================================================================
      ⚠️ when current_trust_score >= MIN_TRUST_SCORE
        
        -- Trust is verified. Proceed with granting access.
        ⚡ do
          ☁️ iam allow user target_user to requested_app
          
          📝 evidence record "Access_Granted" details {
            user: target_user,
            app: requested_app,
            score: current_trust_score,
            status: "SUCCESS"
          }
        🔴 end
        
      -- The 'otherwise' block executes if 'current_trust_score' is less than 85.
      ⭕️ otherwise
        
        -- The request failed the trust check. Execute immediate defensive actions.
        🚨 alert warning message "Zero Trust gate blocked access for {target_user} to {requested_app}. Score: {current_trust_score}"
        
        ⚡ do
          -- Action 1: Hard deny the access request at the IAM level
          ☁️ iam deny user target_user to requested_app
          
          -- Action 2: Force the user to re-authenticate with MFA for their next session
          ☁️ iam force_mfa target_user
          
          -- ============================================================================
          -- 5. EVIDENCE & PROOF (Audit Trail for Denied Access)
          -- ============================================================================
          📝 evidence record "Access_Denied_Default" details {
            user: target_user,
            device: target_device,
            app: requested_app,
            calculated_score: current_trust_score,
            required_score: MIN_TRUST_SCORE,
            action: "DENIED_AND_MFA_FORCED"
          }
          
          -- Anchor the denial of service to the blockchain to prove compliance with access policies
          ⛓️ rosecoin anchor evidence_pack "latest"
          
        🔴 end
        
      🔴 end
      
    🔴 end
  🔴 end
🔴 end