Monitoring and Defense
Intrusion Detection Strategies
Authentication Logging Mechanisms
graph TD
A[Authentication Event] --> B[Log Collection]
B --> C[Real-time Monitoring]
C --> D[Threat Analysis]
D --> E[Defensive Action]
System Authentication Logging
## View authentication logs
sudo tail -f /var/log/auth.log
sudo journalctl -u ssh.service
Defensive Configuration
Failed Login Attempt Tracking
## Configure fail2ban for IP blocking
sudo apt-get install fail2ban
sudo systemctl enable fail2ban
Monitoring Configuration
Tool |
Purpose |
Configuration |
auditd |
Comprehensive system monitoring |
/etc/audit/auditd.conf |
fail2ban |
IP-based defense |
/etc/fail2ban/jail.local |
logwatch |
Log analysis |
/etc/logwatch/conf/ |
Advanced Monitoring Script
#!/bin/bash
## Enhanced password system monitoring
## Real-time authentication attempt tracking
grep "Failed password" /var/log/auth.log \
| awk '{print $11}' \
| sort | uniq -c \
| sort -nr
LabEx Security Insights
At LabEx, we emphasize proactive monitoring and rapid response to potential security threats.
Threat Detection Workflow
- Continuous log monitoring
- Real-time alert generation
- Automated defensive responses
- Forensic analysis
Key Defense Configurations
## Restrict SSH root login
sudo sed -i 's/PermitRootLogin.*/PermitRootLogin no/' /etc/ssh/sshd_config
## Enable strong SSH encryption
sudo sed -i 's/Ciphers.*/Ciphers aes256-ctr,aes192-ctr,aes128-ctr/' /etc/ssh/sshd_config
- Fail2Ban
- OSSEC
- Lynis
- Chkrootkit
Best Practices
- Implement real-time logging
- Use multi-layer defense mechanisms
- Regularly update monitoring tools
- Conduct periodic security audits