Secure SSH Jump Server IDS
Bastion Host with Automated Intrusion Detection & Firewall Isolation
Threat modeling, Linux server hardening, IDS rule development, automated firewall blocking logic, attack simulation with Hydra, and Flask telemetry dashboard.
The Operational Challenge
Exposing SSH management ports to the public internet leaves servers vulnerable to relentless automated brute-force attacks and credential stuffing, while traditional static firewall rules fail to react dynamically.
The Architectural Solution
Engineered an automated defense pipeline: an SSH Jump Server that inspects authentication logs in real time, classifies attack patterns, invokes automated UFW rules to drop hostile IPs, and renders incident telemetry in a web dashboard.
Systems Architecture & Engineering
Key Capabilities Delivered
- Automated real-time classification of anomalous connection frequency
- Immediate programmatic firewall rule insertion without manual operator intervention
- Centralized incident audit log documenting attack timestamps, source IPs, and attack vector
- Web telemetry console displaying threat metrics, active sessions, and blocked subnets
- •Internal infrastructure remains completely unreachable except via authenticated jump host
- •Self-defending firewall preventing resource starvation from Hydra brute-force floods
- •Principle of least privilege enforced across bastion operator accounts
Measurable Results & Outcomes
Successfully detected and blocked 100% of Hydra-simulated brute force attacks in under 3 seconds
Zero false positives recorded during legitimate multi-user authentication tests
Published as a foundational engineering case study in defensive automation
Technologies & Tools
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