Enforce Principle of Least Privilege with GitHub Copilot

function getUserAccess(user) {
    if (user.role === 'admin') {
        return 'full';
    } else if (user.role === 'editor') {
        return 'partial';
    } else {
        return 'none';
    }
}

function performSensitiveAction(user) {
    const accessLevel = getUserAccess(user);
    if (accessLevel === 'full') {
        // Perform action
    } else {
        // Log unauthorized attempt
    }
}

The user access control in the provided code does adhere to the principle of least privilege to a certain extent, but there are areas for improvement:

1. **Role-based Access Control (RBAC)**: The implementation uses a basic form of RBAC, which is a good start. However, it's important to ensure that each role is carefully defined and granted only the permissions necessary for its responsibilities. For instance, 'editor' roles should not have any administrative capabilities.

2. **Granular Permissions**: Instead of returning a general access level, consider defining specific permissions for each action. This allows for more granular control and ensures users can perform only the actions they need.

3. **Default Deny**: The default access level is set to 'none', which is good practice. Ensure that all unspecified or undefined roles default to the least level of access.

4. **Audit and Review**: Regularly audit user roles and permissions to ensure they still align with job functions and the principle of least privilege. Remove or downgrade access that is no longer necessary.

5. **Sensitive Action Authorization**: The `performSensitiveAction` function checks for 'full' access but does not specify what this action is or if additional checks are required. Ensure that sensitive actions are well-defined and protected by adequate checks beyond just role names.

6. **Error Handling and Logging**: The code should handle unauthorized attempts more securely. Instead of just logging, it should alert administrators to repeated or suspicious unauthorized attempts.

Here is an improved version considering these points:

```javascript
function getUserPermissions(user) {
    switch(user.role) {
        case 'admin':
            return ['edit', 'delete', 'view'];
        case 'editor':
            return ['edit', 'view'];
        default:
            return ['view'];  // Default to least privilege
    }
}

function performSensitiveAction(user) {
    const permissions = getUserPermissions(user);
    if (permissions.includes('delete')) {
        // Perform action
    } else {
        // Alert admin on unauthorized attempt
    }
}