Implement Guardian identity + device trust foundations with fail-closed security fallbacks

system/security/guardian/build/Makefile

@@ -8,14 +8,17 @@ DASHBOARD_SRC_DIR = ../dashboard
 BOOT_DIR = ../boot
 IU_SECURITY_DIR = ../iu_security
 AUTH_DIR = ../auth
+IDENTITY_SRC_DIR = ../identity
+TRUST_SRC_DIR = ../trust
 
 OUT_DIR = ./out
 
 # Kotlin source files
 KOTLIN_SRCS = $(wildcard $(SRC_DIR)/*.kt) \
                $(wildcard $(THREAT_SRC_DIR)/*.kt) \
                $(wildcard $(DASHBOARD_SRC_DIR)/*.kt) \
-               $(SRC_DIR)/AcingVaultEmulator.kt
+               $(wildcard $(IDENTITY_SRC_DIR)/*.kt) \
+               $(wildcard $(TRUST_SRC_DIR)/*.kt)
 
 # Class files will be generated here
 CLASSES_DIR = $(OUT_DIR)/classes

system/security/guardian/core/GuardianService.kt

@@ -1,6 +1,14 @@
 package com.acing.guardian
 
 import com.acing.guardian.AcingVaultEmulator
+import com.acing.guardian.identity.IdentityService
+import com.acing.guardian.identity.UserRole
+import com.acing.guardian.trust.DeviceTrustEngine
+import com.acing.guardian.trust.EnforcementAction
+import com.acing.guardian.trust.TrustSignal
+import java.util.Base64
+import java.util.concurrent.CopyOnWriteArrayList
+import java.util.concurrent.atomic.AtomicBoolean
 
 // Stubs for external dependencies to allow GuardianService to compile
 // In a real implementation, these would be separate modules or interfaces
@@ -10,12 +18,18 @@ abstract class SystemService {
 }
 
 object SecurityRepository {
+    private val listeners = CopyOnWriteArrayList<(String) -> Unit>()
+
     fun getInstance(): SecurityRepository = this
+
     fun registerListener(listener: (String) -> Unit) {
-        // Simulate security state updates
-        // In a real system, this would be driven by actual security events
+        listeners.add(listener)
         listener("INITIAL_STATE")
     }
+
+    fun publishEvent(event: String) {
+        listeners.forEach { listener -> listener(event) }
+    }
 }
 
 object AdminDashboardViewModel {
@@ -32,41 +46,36 @@ object IntegrityChecker {
     }
 }
 
-object MalwareScanner {
-    fun start() {
-        println("[MalwareScanner] Starting malware scanner...")
-        // Logic to start real-time malware scanning
-    }
-}
-
-object AnomalyDetector {
-    fun start() {
-        println("[AnomalyDetector] Starting anomaly detector...")
-        // Logic to start behavioral anomaly detection
-    }
-}
-
-object NetworkThreatMonitor {
-    fun start() {
-        println("[NetworkThreatMonitor] Starting network threat monitor...")
-        // Logic to start network threat monitoring
+class GuardianService : SystemService() {
+    private companion object {
+        private const val DEFAULT_DEVICE_ID = "guardian-default-device"
+        private const val INTERFACE_USER_PACKAGE_PATH = "/system/app/com.acing.iu"
+        private const val INTERFACE_USER_RUNTIME_ID = "com.acing.iu.runtime"
     }
-}
 
-class GuardianService : SystemService() {
+    private val identityService = IdentityService()
+    private val deviceTrustEngine = DeviceTrustEngine()
+    private val authAvailable = AtomicBoolean(false)
+    private val vaultAvailable = AtomicBoolean(true)
+    private val adminAccessBlocked = AtomicBoolean(false)
 
     override fun onStart() {
         println("[GuardianService] Starting Acing Guardian Service...")
 
         // Initialize Acing Vault Emulator
-        AcingVaultEmulator.initialize()
+        try {
+            AcingVaultEmulator.initialize()
+        } catch (ex: Exception) {
+            handleCriticalFailure("VAULT_INIT_FAILURE", "Acing Vault initialization failed", ex)
+            return
+        }
+
         if (AcingVaultEmulator.isTampered()) {
-            println("[GuardianService] CRITICAL: Acing Vault detected as tampered. Entering lockdown.")
-            // In a real system, this would trigger a system-wide lockdown or recovery mode.
-            // For emulator, we\'ll just log and potentially restrict functionality.
+            handleCriticalFailure("VAULT_TAMPER_DETECTED", "Acing Vault detected as tampered")
             return
         }
 
+        initializeIdentityLayer()
         // Real-time threat detection (similar to Knox Matrix)
         startThreatEngine()
 
@@ -83,8 +92,16 @@ class GuardianService : SystemService() {
 
     private fun setupInterfaceUserProtection() {
         println("[GuardianService] Setting up Interface User protection...")
+        if (!enforceDeviceTrustForInterfaceUser()) {
+            println("[GuardianService] Access restricted by device trust policy.")
+            return
+        }
+
         // Protect Admin Dashboard access, potentially backed by Acing Vault
-        requireBiometricOrStrongAuth()
+        if (!requireBiometricOrStrongAuth()) {
+            println("[GuardianService] Admin dashboard access denied due to authentication fallback policy.")
+            return
+        }
 
         // Runtime integrity checks on UI components
         IntegrityChecker.monitorPackage("com.acing.iu")
@@ -97,7 +114,12 @@ class GuardianService : SystemService() {
         if (AcingVaultEmulator.storeSecret("admin_session_key", sensitiveData)) {
             println("[GuardianService] Admin session key securely stored in Acing Vault.")
         } else {
-            println("[GuardianService] Failed to store admin session key in Acing Vault. Tamper detected or other error.")
+            vaultAvailable.set(false)
+            handleCriticalFailure(
+                "VAULT_STORE_FAILURE",
+                "Failed to store admin session key in Acing Vault. Blocking additional admin access attempts."
+            )
+            return
         }
 
         println("[GuardianService] Interface User protection configured.")
@@ -114,16 +136,102 @@ class GuardianService : SystemService() {
     }
 
     // Placeholder for biometric/strong authentication requirement
-    private fun requireBiometricOrStrongAuth() {
+    private fun requireBiometricOrStrongAuth(): Boolean {
+        if (adminAccessBlocked.get()) {
+            println("[GuardianService] Admin access denied: service is in fail-closed mode.")
+            SecurityRepository.publishEvent("AUTH_DENIED_FAIL_CLOSED")
+            return false
+        }
+
+        if (!authAvailable.get()) {
+            adminAccessBlocked.set(true)
+            println("[GuardianService] Auth service unavailable. Denying admin access (fail-closed).")
+            SecurityRepository.publishEvent("AUTH_UNAVAILABLE_FAIL_CLOSED")
+            return false
+        }
+
+        if (!vaultAvailable.get()) {
+            adminAccessBlocked.set(true)
+            println("[GuardianService] Acing Vault unavailable. Denying admin access (fail-closed).")
+            SecurityRepository.publishEvent("VAULT_UNAVAILABLE_FAIL_CLOSED")
+            return false
+        }
+
         println("[GuardianService] Biometric or strong authentication required for Admin Dashboard access, potentially backed by Acing Vault.")
         // Actual implementation would involve interacting with Android\'s BiometricPrompt or KeyguardManager
         // and potentially using AcingVaultEmulator.performAttestation() for device trust.
+        return true
     }
 
     // Placeholder for secure workspace enablement
     private fun enableSecureWorkspaceForRole(role: String) {
+        if (!vaultAvailable.get()) {
+            println("[GuardianService] Secure workspace blocked: Acing Vault is unavailable.")
+            SecurityRepository.publishEvent("WORKSPACE_BLOCKED_VAULT_UNAVAILABLE")
+            return
+        }
+
         println("[GuardianService] Enabling secure workspace for role: $role, leveraging Acing Vault for key management.")
         // Actual implementation would involve creating an isolated environment or secure storage
         // and using AcingVaultEmulator for managing encryption keys for the workspace.
     }
+
+    private fun initializeIdentityLayer() {
+        try {
+            val adminUser = identityService.provisionUser(
+                username = "guardian_admin",
+                roles = setOf(UserRole.ADMIN)
+            )
+            val bootstrapProbeCredential = Base64.getEncoder()
+                .encodeToString(AcingVaultEmulator.getSecureRandomBytes(24))
+            // Non-interactive bootstrap credential used only to verify credential lifecycle and vault integration wiring.
+            // TODO(PROD): Replace with real administrator enrollment flow and secure out-of-band credential delivery.
+            val bootstrapCredential = identityService.createCredential(adminUser.id, bootstrapProbeCredential)
+            identityService.revokeCredential(bootstrapCredential.id)
+            authAvailable.set(true)
+            SecurityRepository.publishEvent("IDENTITY_SERVICE_READY")
+            println("[GuardianService] Identity service initialized and admin user provisioned.")
+        } catch (ex: Exception) {
+            authAvailable.set(false)
+            adminAccessBlocked.set(true)
+            handleCriticalFailure("AUTH_SERVICE_FAILURE", "Identity service initialization failed", ex)
+        }
+    }
+
+    private fun enforceDeviceTrustForInterfaceUser(): Boolean {
+        val malwareDetected = !MalwareScanner.scanFile(INTERFACE_USER_PACKAGE_PATH)
+        val anomalyDetected = AnomalyDetector.detectAnomaly(INTERFACE_USER_RUNTIME_ID)
+        val networkThreatDetected = NetworkThreatMonitor.analyzeConnection(INTERFACE_USER_RUNTIME_ID)
+        val attestationPassed = deviceTrustEngine.attestDevice(
+            deviceId = DEFAULT_DEVICE_ID,
+            challenge = AcingVaultEmulator.getSecureRandomBytes(16)
+        )
+
+        val trustDecision = deviceTrustEngine.evaluateTrust(
+            deviceId = DEFAULT_DEVICE_ID,
+            signal = TrustSignal(
+                malwareRisk = if (malwareDetected) 90 else 10,
+                anomalyScore = if (anomalyDetected) 80 else 15,
+                networkRisk = if (networkThreatDetected) 75 else 10,
+                attestationPassed = attestationPassed
+            )
+        )
+
+        println("[GuardianService] Device trust score=${trustDecision.trustScore}; action=${trustDecision.enforcementAction}.")
+        SecurityRepository.publishEvent("DEVICE_TRUST_${trustDecision.enforcementAction}")
+
+        if (trustDecision.enforcementAction == EnforcementAction.DENY_ACCESS) {
+            adminAccessBlocked.set(true)
+            return false
+        }
+
+        return true
+    }
+
+    private fun handleCriticalFailure(eventCode: String, message: String, ex: Exception? = null) {
+        println("[GuardianService] CRITICAL: $message")
+        ex?.let { println("[GuardianService] ERROR: ${it.message}") }
+        SecurityRepository.publishEvent(eventCode)
+        adminAccessBlocked.set(true)
+    }
 }