Which firewall platforms are supported for audit?

The skill supports automated parsing for AWS Security Groups, Azure NSGs, and Linux iptables. For enterprise hardware like Cisco or Palo Alto, you can simply export your rules to a CSV file using our provided header template.

How does this skill detect redundant or 'shadowed' rules?

Unlike a basic prompt, this skill uses specific logic to identify 'shadowed' rules—rules that are never reached because a higher-priority rule catches the traffic first. It systematically maps every port against a database of common vulnerabilities to ensure no administrative port is left exposed.

What exactly is included in the purchase?

Your purchase includes the full firewall auditor skill, a standardized CSV template for hardware exports, and a guide on how to export rule sets from supported cloud providers. All future logic updates and new port definitions are included at no extra cost.

Does the agent need direct access to my cloud environment or hardware?

No direct access is needed; you simply provide the rule set as a file or text export (like an iptables-save output). This ensures your live infrastructure remains untouched while the skill performs the analysis in a sandbox environment.

What kind of output can I expect after the audit is complete?

The skill delivers a categorized report graded by severity (Critical to Low), followed by a 'Cleanup Plan' that lists exactly which rules should be deleted, narrowed, or moved to improve security and performance.

Firewall Rule Auditor

Example session with this skill installed

Audit this AWS Security Group export for a production VPC. Focus on internet-facing risks and shadowed rules. [sgs.json attached]

Read your context and instructions
Compiled the firewall rule auditor

I have audited the provided AWS Security Group configuration. The analysis identified 2 critical exposures and 3 redundant rules that should be addressed immediately to reduce the attack surface.

Firewall Audit Report

Severity	Rule ID	Source	Port/Service	Issue	Impact
CRITICAL	sg-0a12b	0.0.0.0/0	22 (SSH)	Administrative port exposed to internet	Remote brute force risk
CRITICAL	sg-0c34d	0.0.0.0/0	3306 (MySQL)	Database port exposed to internet	Data exfiltration risk
HIGH	sg-0e56f	0.0.0.0/0	1024-65535	Overly broad port range	Unnecessary lateral exposure
MEDIUM	sg-0g78h	10.0.0.0/8	Any	Shadowed by rule sg-0a12b	Rule will never be reached
LOW	sg-0i90j	192.168.1.1	80	Disabled rule	Configuration clutter
LOW	sg-0k12l	10.0.0.5	443	Missing description	Hard to maintain/audit

Cleanup Plan

Immediate Action: Modify sg-0a12b and sg-0c34d to restrict access to specific trusted bastion or VPN IP addresses only.
2.

Hygiene: Remove shadowed rule sg-0g78h and the disabled rule sg-0i90j after verifying they are no longer needed for legacy compatibility.
3.

Documentation: Update rule sg-0k12l with a clear owner and purpose description to satisfy compliance requirements.

Next steps

Generate a change ticket for the SSH and MySQL access restrictions.
Verify if the broad port range in sg-0e56f is required for ephemeral ports or can be tightened.
Run a follow-up audit after the changes are applied to confirm the new security posture.

Connects securely to your tools. The creator never sees your data.

About this skill

Manual firewall audits are tedious and prone to human error, often leaving critical security gaps unnoticed until a breach occurs. This skill automates the analysis of rule sets to identify misconfigurations and exposure risks instantly.

What it does

Risk identification flags any-any allow rules and direct internet exposure to administrative or database ports.
Hygiene analysis detects shadowed, redundant, and disabled rules that clutter configurations.
Exposure mapping isolates wide port ranges and overly broad source networks like /8 blocks.
Cleanup planning generates prioritized remediation steps for closing critical gaps and removing dead rules.
Multi-format support processes exports from AWS, Azure, Linux iptables, and various enterprise firewalls via CSV.

How it works

Import the rule set by providing iptables-save output, AWS/Azure JSON, or a standard CSV export.
Analysis begins as the skill parses evaluation order and cross-references ports against a known database of management services.
Reporting delivers a categorized list of findings graded by severity from Critical to Low.
Remediation provides a structured cleanup plan including specific rule deletions and ticketing recommendations.

Frameworks & tools

Supports Linux iptables, AWS Security Groups, Azure NSG, and generic CSV exports from Cisco ASA, Fortinet, Palo Alto, pfSense, and Check Point.

Why this beats prompting it yourself

Writing prompts to catch complex shadowing or specific port vulnerabilities often misses nuances in evaluation order. This skill uses a defined logic for protocol-port mapping and rule precedence, ensuring a systematic audit rather than a superficial scan.

Use cases

Audit cloud security groups before a production release.
Clean up legacy firewall configurations with thousands of redundant rules.
Prepare for compliance audits by identifying undocumented and any-any rules.
Perform quick security health checks after network infrastructure changes.

Known limitations

Rule order in the provided file is treated as the evaluation order. Requires specific CSV column headers or standard cloud JSON formats to function correctly.

How to use

Skills on Agensi run inside your AI agent. Copy the prompt, paste it into your agent, and it connects to Agensi and installs this skill for you. If a payment is needed, your agent shows it to you first.

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Firewall Rule Auditor