Proactive Problem Prevention

Proactive Problem Prevention

The best troubleshooting happens before problems occur. Implement proactive measures to identify and resolve issues before they impact users.

Automated Configuration Auditing:

#!/usr/bin/env python3
# Firewall configuration auditor

class FirewallAuditor:
    def __init__(self):
        self.issues = []
        self.warnings = []
        
    def audit_rules(self):
        """Comprehensive firewall audit"""
        
        # Check for common misconfigurations
        self.check_overly_permissive_rules()
        self.check_rule_order_efficiency()
        self.check_obsolete_rules()
        self.check_missing_rate_limits()
        self.check_logging_configuration()
        
        return {
            'issues': self.issues,
            'warnings': self.warnings,
            'score': self.calculate_security_score()
        }
    
    def check_overly_permissive_rules(self):
        """Identify rules that may be too permissive"""
        
        rules = self.get_current_rules()
        
        for rule in rules:
            # Check for any/any rules
            if (rule.get('source') == '0.0.0.0/0' and 
                rule.get('destination') == '0.0.0.0/0' and
                rule.get('action') == 'ACCEPT'):
                self.issues.append({
                    'severity': 'HIGH',
                    'rule': rule['raw'],
                    'issue': 'Overly permissive any/any rule',
                    'recommendation': 'Restrict source and destination'
                })
            
            # Check for wide port ranges
            if rule.get('dport') and ':' in str(rule.get('dport')):
                port_range = rule['dport'].split(':')
                if int(port_range[1]) - int(port_range[0]) > 1000:
                    self.warnings.append({
                        'severity': 'MEDIUM',
                        'rule': rule['raw'],
                        'issue': 'Wide port range',
                        'recommendation': 'Consider narrowing port range'
                    })
    
    def generate_report(self):
        """Generate audit report"""
        
        report = f"""
# Firewall Audit Report
Generated: {datetime.now()}