NIS2 Compliance for DNS Infrastructure

Quick reference: How this DNS monitoring system supports NIS2 compliance

What is NIS2?

NIS2 Directive (EU) 2022/2555 - EU cybersecurity regulation effective October 2024.

Applies to: Essential and important entities including DNS service providers, hosting providers, and digital infrastructure operators.

Key Requirements:

Incident detection and reporting
Risk management measures
Security of network and information systems
Supply chain security
Business continuity

For full directive details: EUR-Lex Official Text

Why DNS Monitoring Matters for NIS2

DNS as Critical Infrastructure

DNS is explicitly mentioned in NIS2 as critical infrastructure. Service providers must:

Detect incidents - Unauthorized DNS changes can indicate:
- Account compromise
- DNS hijacking attempts
- Insider threats
- Configuration errors leading to service disruption
Maintain audit trails - Document who changed what and when
Report significant incidents - Within strict timeframes (24h early warning, 72h incident notification)
Demonstrate governance - Show proactive monitoring and controls

The Problem

DirectAdmin doesn't natively provide:

Real-time DNS change notifications
DNS modification audit trails
Domain owner alerting
Change attribution (who made the change)

This creates compliance gaps for hosting providers and DNS operators.

How This System Helps

Immediate Benefits

NIS2 Requirement	This System's Capability
Incident Detection	Real-time alerts when DNS records change
Attribution	Logs show which admin made changes
Audit Trail	Complete before/after history with timestamps
Stakeholder Notification	Automatic email to domain owners
Evidence Collection	Backup zone files for forensic analysis
Risk Management	Early detection of unauthorized changes

What This System Does

Captures all DNS changes - Every record modification is logged
Notifies domain owners - Immediate email with detailed diff
Creates audit trail - Timestamped backups with attribution
Enables investigation - Full before/after comparison
Supports reporting - Structured logs and notifications for incident reports

What This System Doesn't Do

❌ This is NOT a complete NIS2 compliance solution ❌ Does NOT replace ISMS (Information Security Management System) ❌ Does NOT handle incident reporting to authorities ❌ Does NOT cover all NIS2 requirements (authentication, encryption, patching, etc.)

Use this as ONE COMPONENT of your NIS2 compliance program.

Implementation for Compliance

1. Deploy the System

# Install DNS monitoring hooks
sudo cp scripts/dns/all_pre.sh scripts/dns/dns_write_post.sh \
    /usr/local/directadmin/scripts/custom/
sudo chmod 755 /usr/local/directadmin/scripts/custom/*.sh

2. Configure Retention

# Set backup retention (adjust based on your compliance requirements)
echo 'DNS_BACKUP_RETENTION="90"' | sudo tee -a /etc/default/da-dns-alerts

# NIS2 suggests keeping incident-related data for investigation periods
# Common practice: 90 days to 1 year

3. Document the System

For compliance audits, document:

System Description:

How DNS changes are detected (DirectAdmin hooks)
Who receives notifications (domain owners + admin)
Where data is stored (/var/local/da_dns_backups, /var/log/da-hooks)
Retention periods (configurable, default 7 days)

Incident Response:

What triggers an alert (any DNS record change)
Who investigates (admin team)
How to access historical data (backup files and logs)
Escalation procedures (when to report to authorities)

4. Establish Monitoring

# Daily check for DNS changes
# /etc/cron.daily/nis2-dns-monitoring

#!/bin/bash
LOG_FILE="/var/log/da-hooks/dns_notify.log"
YESTERDAY=$(date -d "yesterday" +%Y-%m-%d)

# Count DNS changes
CHANGE_COUNT=$(grep "$YESTERDAY" "$LOG_FILE" | grep -c "Notification sent")

# Alert if unusual volume
if [ "$CHANGE_COUNT" -gt 50 ]; then
    echo "Unusual DNS activity: $CHANGE_COUNT changes on $YESTERDAY" | \
        mail -s "NIS2 Alert: High DNS Activity" security@example.com
fi

5. Regular Reporting

# Monthly DNS change report for compliance records
#!/bin/bash
MONTH=$(date +%Y-%m)
OUTPUT="/var/compliance/dns_changes_${MONTH}.txt"

grep "Notification sent" /var/log/da-hooks/dns_notify.log | \
    grep "$MONTH" > "$OUTPUT"

echo "DNS Changes for $MONTH: $(wc -l < $OUTPUT)" | \
    mail -s "Monthly DNS Activity Report" compliance@example.com

Incident Detection Scenarios

Scenario 1: Unauthorized DNS Change

Event: Admin account compromised, attacker changes MX records

System Response:

all_pre.sh backs up current zone
Attacker modifies DNS via DirectAdmin
dns_write_post.sh detects change, emails domain owner
Owner sees unauthorized change immediately
Owner contacts hosting provider
Provider investigates using logs and backups

NIS2 Requirement Met: Incident detected and stakeholders notified in real-time

Scenario 2: Configuration Error

Event: Admin accidentally deletes critical A record

System Response:

Owner receives notification showing deleted record
Owner contacts support
Support reviews backup showing old record
Record restored quickly
Incident documented in logs

NIS2 Requirement Met: Rapid detection and recovery, full audit trail

Scenario 3: DNS Hijacking Attempt

Event: Attacker changes nameservers to malicious servers

System Response:

Immediate notification to domain owner
Owner sees unauthorized NS record change
Emergency response: owner contacts provider
Provider locks account, investigates, restores DNS
Backup provides forensic evidence

NIS2 Requirement Met: Early detection enables rapid response before propagation

Audit Trail Requirements

What NIS2 Requires

Logging: Record security-relevant events
Attribution: Who performed the action
Timestamps: When it occurred
Integrity: Logs protected from tampering
Retention: Keep for appropriate period

What This System Provides

Log Format (/var/log/da-hooks/dns_notify.log):

[2025-10-29 14:32:15] Notification sent via 'mail' to owner@example.com for domain example.com
[2025-10-29 14:32:15] INFO: DNS write post-hook triggered for domain: example.com
[2025-10-29 14:32:15] Backed up DNS zone for example.com (command: CMD_DNS_ADMIN, action: save, user: admin)

Backup Files (/var/local/da_dns_backups/):

example.com.20251029_143215.db  - Full zone snapshot with timestamp
example.com.last_backup         - Pointer to most recent backup

Email Notifications: Sent to domain owners with:

Domain name
Modification timestamp
Admin username who made change
Complete before/after diff
Server hostname

Securing the Audit Trail

# Protect log files from tampering
sudo chmod 640 /var/log/da-hooks/*.log
sudo chown root:adm /var/log/da-hooks/*.log

# Protect backups
sudo chmod 700 /var/local/da_dns_backups
sudo chown root:root /var/local/da_dns_backups

# Optional: Send logs to remote syslog for immutability
echo "*.* @@siem.example.com:514" | sudo tee -a /etc/rsyslog.conf
sudo systemctl restart rsyslog

Incident Reporting

NIS2 Reporting Timelines

Early Warning: Within 24 hours of becoming aware Incident Notification: Within 72 hours Final Report: Within 1 month

Using This System for Reports

When a significant DNS incident occurs:

Identify the incident:

# Find all changes for affected domain
grep "example.com" /var/log/da-hooks/dns_notify.log

Gather evidence:

# Retrieve backup showing unauthorized change
ls -lh /var/local/da_dns_backups/example.com.*

# Get diff showing what changed
diff -u /var/local/da_dns_backups/example.com.20251029_140000.db \
        /var/named/example.com.db

Document timeline:
- When change occurred (from log timestamps)
- Who made change (from log attribution)
- When detected (notification timestamp)
- What changed (from diff)
Include in incident report:
- System logs showing unauthorized access
- DNS change notifications sent to owner
- Backup files as evidence
- Remediation actions taken

Best Practices

1. Regular Testing

# Monthly test: Verify notifications are working
sudo domain=test.example.com username=admin \
    DNS_SEND_EMAIL=true \
    /usr/local/directadmin/scripts/custom/dns_write_post.sh

# Check email received

2. Integration with SIEM

# Forward logs to SIEM for correlation
# Example: rsyslog to Splunk/ELK/Graylog
echo '$ModLoad imfile' | sudo tee -a /etc/rsyslog.conf
echo '$InputFileName /var/log/da-hooks/dns_notify.log' | sudo tee -a /etc/rsyslog.conf
echo '$InputFileTag directadmin-dns:' | sudo tee -a /etc/rsyslog.conf
echo '$InputFileStateFile stat-dns-notify' | sudo tee -a /etc/rsyslog.conf
echo '$InputRunFileMonitor' | sudo tee -a /etc/rsyslog.conf

3. Define "Significant Incident"

Document what constitutes a significant DNS incident requiring NIS2 reporting:

Examples:

Unauthorized changes by external attacker
DNS hijacking affecting service availability
Configuration errors causing widespread outage
Supply chain compromise affecting DNS infrastructure

Not typically significant:

Routine authorized changes
Planned maintenance
Minor configuration adjustments

4. Staff Training

Train admin team on:

How the DNS monitoring system works
How to investigate alerts
When to escalate to security team
NIS2 incident reporting procedures

Compliance Checklist

Additional Resources

Official NIS2 Resources

Directive Text: https://eur-lex.europa.eu/eli/dir/2022/2555
Implementing Regulation: https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=OJ:L_202402764
National Authorities: Contact your EU member state's CSIRT

Complementary Security Measures

For full NIS2 compliance, also implement:

Multi-factor authentication (MFA)
Access control and least privilege
Regular security updates and patching
Encryption (data at rest and in transit)
Business continuity planning
Supply chain security
Security awareness training
Regular security audits

Support

Questions About This System

Email: contact@itcms.gr
Support: support@itcms.gr
Website: https://itcms.gr

Compliance Consulting

Need help with NIS2 compliance strategy?

Email: contact@itcms.gr
Services: Compliance assessments, gap analysis, implementation support

Disclaimer

This system supports but does not guarantee NIS2 compliance. Organizations must:

Implement comprehensive security controls beyond DNS monitoring
Develop complete ISMS aligned with NIS2 requirements
Establish incident response and reporting procedures
Maintain appropriate documentation and evidence
Engage with national competent authorities

Consult legal and compliance professionals for authoritative NIS2 guidance.

License

Part of the DirectAdmin DNS Change Alert System https://itcms.gr

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NIS2.md

File metadata and controls

NIS2 Compliance for DNS Infrastructure

What is NIS2?

Why DNS Monitoring Matters for NIS2

DNS as Critical Infrastructure

The Problem

How This System Helps

Immediate Benefits

What This System Does

What This System Doesn't Do

Implementation for Compliance

1. Deploy the System

2. Configure Retention

3. Document the System

4. Establish Monitoring

5. Regular Reporting

Incident Detection Scenarios

Scenario 1: Unauthorized DNS Change

Scenario 2: Configuration Error

Scenario 3: DNS Hijacking Attempt

Audit Trail Requirements

What NIS2 Requires

What This System Provides

Securing the Audit Trail

Incident Reporting

NIS2 Reporting Timelines

Using This System for Reports

Best Practices

1. Regular Testing

2. Integration with SIEM

3. Define "Significant Incident"

4. Staff Training

Compliance Checklist

Additional Resources

Official NIS2 Resources

Complementary Security Measures

Support

Questions About This System

Compliance Consulting

Disclaimer

License