Chapter 13: Modular Sandbox Execution System

Modular Component Architecture:

pub struct ModularSandboxSystem {
    module_loader: SecureModuleLoader,
    sandbox_engine: AdvancedSandboxEngine,
    capability_manager: ModuleCapabilityManager,
    ipc_framework: SecureIPCFramework,
    resource_monitor: ResourceMonitoringSystem,
}

impl ModularSandboxSystem {
    pub fn load_verified_module(
        &mut self,
        module_binary: &[u8],
        module_signature: &ModuleSignature,
        execution_capabilities: &[Capability],
    ) -> Result<ModuleHandle, ModuleLoadError> {
        // Verify module signature
        let verification_result = self.module_loader
            .verify_module_signature(module_binary, module_signature)?;
        
        // Create isolated sandbox
        let sandbox = self.sandbox_engine
            .create_isolated_sandbox(execution_capabilities)?;
        
        // Load module into sandbox
        let loaded_module = self.module_loader
            .load_into_sandbox(module_binary, &sandbox, &verification_result)?;
        
        // Setup capability restrictions
        let capability_context = self.capability_manager
            .create_module_capability_context(execution_capabilities, &sandbox)?;
        
        // Initialize IPC channels
        let ipc_channels = self.ipc_framework
            .create_secure_channels(&loaded_module, &capability_context)?;
        
        // Start resource monitoring
        let resource_monitor = self.resource_monitor
            .start_monitoring(&loaded_module, &sandbox)?;
        
        Ok(ModuleHandle {
            module_id: loaded_module.id(),
            sandbox,
            capability_context,
            ipc_channels,
            resource_monitor,
            load_timestamp: precise_timestamp(),
        })
    }
}

Secure IPC Framework:

pub struct SecureIPCFramework {
    channel_manager: EncryptedChannelManager,
    message_validator: IPCMessageValidator,
    capability_enforcer: IPCCapabilityEnforcer,
}

impl SecureIPCFramework {
    pub fn send_secure_message(
        &self,
        sender: &ModuleHandle,
        receiver: &ModuleHandle,
        message: &IPCMessage,
    ) -> Result<IPCResult, IPCError> {
        // Validate sender has permission to send
        self.capability_enforcer
            .verify_send_capability(sender, receiver, message)?;
        
        // Validate message format and content
        let validated_message = self.message_validator
            .validate_message_security(message)?;
        
        // Encrypt message for secure transmission
        let encrypted_message = self.channel_manager
            .encrypt_message(&validated_message, sender, receiver)?;
        
        // Transmit through secure channel
        self.channel_manager
            .transmit_encrypted_message(encrypted_message, receiver)
    }
}