Firewall Config Conversion

Firewall Config Conversion

Overview

Use this skill to convert a firewall or NGFW configuration from one vendor to another by pivoting through the parsing-* intermediate JSON schema. Any source vendor that has a parser (Cisco ASA/FTD, FortiGate, Palo Alto PAN-OS, Juniper SRX) can be converted to any of the four supported targets, because every conversion reads the same normalized schema — address_objects, address_groups, service_objects, service_groups, security_policies, nat_rules, zones, interfaces, static_routes / virtual_routers / routing, vpn_tunnels, ha_config, and system (abbreviated — see the canonical intermediate-schema.md in the parsing-srx-configs skill for the full top-level structure) — and re-emits it in the target's native CLI. This schema-pivot design means there is one emitter per target rather than one translator per source/target pair.

The output is always two parts: the target vendor's native configuration, followed by a per-section fidelity report. The config carries inline # CAVEAT: comments wherever a translation is lossy or approximate, and the fidelity report classifies each schema section as converted, converted-with-caveats, or manual-not-converted, then lists the manual follow-up items that a human must complete on the target device.

This skill produces a migration draft, never a production-ready config. Vendor security models differ enough — zones versus security-levels, App-ID versus port-based services, routing-instances versus contexts or vsys — that no automated conversion is safe to commit unreviewed. Secrets are never emitted: VPN pre-shared keys, certificates, and admin passwords are always replaced with placeholders and flagged as manual items, so the draft can be shared and reviewed without leaking credentials.

Scope and routing

Convert only normalized parser output and only to vendors with an emitter in references/; never improvise unsupported target syntax. Route audits to firewall-best-practices-audit and comparisons to firewall-config-diff.

Input Handling

Route on what you were given:

• Parsed intermediate schema (the vendor-neutral JSON produced by any parsing-* skill; the schema definition lives in the parsing-srx-configs skill) — convert directly. Read metadata.source_vendor to label the draft and to choose source-aware caveats (metadata.source_vendor is the canonical schema field; for robustness also accept a legacy metadata.vendor key if a non-conformant parse provides one — read whichever is present).
• Raw config — identify the vendor from the syntax, run the matching parsing-* skill (parsing-cisco-configs, parsing-fortinet-configs, parsing-palo-configs, parsing-srx-configs) to produce the intermediate schema, then convert the result. Never re-implement parsing in this skill.
• Target vendor — the user must pick the target (Cisco ASA/FTD, FortiGate, PAN-OS, or SRX). If they did not, ask before emitting; there is one emitter per target and the wrong one produces unusable output.

Conversion Workflow

1. Confirm inputs. Verify you have the intermediate schema (parse raw config first), read metadata.source_vendor for the source, and confirm the user's chosen target vendor.
2. Load references. Load references/feature-mapping.md for the cross-vendor concept map, plus the appropriate target emitter file (references/emit-srx.md, references/emit-palo.md, references/emit-fortinet.md, or references/emit-cisco.md) for the native syntax of each section.
3. Emit each section. Walk the schema sections in the output order below and emit each in the target's native CLI. Where a construct does not map cleanly, emit the closest equivalent and insert an inline # CAVEAT: ... comment explaining the approximation.
4. Classify for the report. As you emit, classify each section as converted, converted-with-caveats, or manual-not-converted, and collect the manual follow-up items.
5. Placeholder all secrets. Replace every PSK, key, certificate, and password with a clearly-marked placeholder and add a manual item to re-key on the target — never emit a real or parsed secret.
6. Produce the output. Emit the labeled draft config first, then the fidelity report, in the templates below.

Output & Fidelity Report

Conversion output (emit in this order)

# Conversion DRAFT:  -> 
# Review required. Not production-ready. Manual items listed in the fidelity report.

Fidelity report (after the config)

Fidelity report ( -> )
Section: address_objects     →  ()
Section: zones               → ...
Section: security_policies   → ...
Section: nat_rules           → ...
Section: interfaces          → ...
Section: routing             → ...
Section: vpn_tunnels         → ...
Section: ha_config           → ...
Section: system / admin      → ...
Manual items (must do on target):
  1. 
  2. ...

Reference Material (load on demand)

• references/feature-mapping.md — cross-vendor concept map (zones vs security-levels, App-ID vs port services, routing-instances vs contexts/vsys, NAT models) and what is lossy in each direction.
• references/emit-srx.md — emit the schema as Juniper SRX set configuration.
• references/emit-palo.md — emit the schema as Palo Alto PAN-OS configuration.
• references/emit-fortinet.md — emit the schema as FortiGate config blocks.
• references/emit-cisco.md — emit the schema as Cisco ASA/FTD configuration.
• references/example-conversion.md — a worked conversion against a parsing-* fixture, with its fidelity report.

Common Pitfalls

• Claiming the converted config is production-ready — it is a draft; require review plus the manual items.
• Emitting secrets — PSKs, keys, and passwords are always placeholders plus a manual caveat.
• Silently dropping a section with no target equivalent — report it as manual-not-converted.
• Re-implementing parsing instead of delegating to the matching parsing-* skill.
• Forcing a 1:1 mapping where the target model differs (zones vs security-levels, App-ID vs port services, routing-instances vs contexts/vsys) — emit the closest form plus a CAVEAT.
• Converting interface, routing, and system sections verbatim — these are platform-bound; remap and flag naming and protocol semantics.
• Losing rule or NAT order — preserve order in the emitted config.

Verification Checklist

• [ ] Confirm input is the intermediate schema (parse raw first) and the target vendor is chosen.
• [ ] Every emittable schema section is either converted or explicitly reported (no silent drops).
• [ ] Inline CAVEAT comments mark every lossy/approximate translation.
• [ ] No secrets in the output (PSKs/keys/passwords placeholdered).
• [ ] Rule and NAT order preserved.
• [ ] Output labeled a migration draft; fidelity report lists all manual items.

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: fastrevmd-lab
• Source: fastrevmd-lab/fwskillsshare
• License: Apache-2.0
• Homepage: https://mechub.org

Install and usage instructions live in the source repository linked above.