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deploying-software-defined-perimeter

Deploy a Software-Defined Perimeter with SPA, mutual TLS, and SDP controller configuration.

954|172|Updated Mar 13, 2026
Search Tags:#mtls#network security#Zero Trust#ztna#SDP#software-defined perimeter#single packet authorization
One-click install
npx skills add https://github.com/xalgord/xalgorix --skill deploying-software-defined-perimeter
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: deploying-software-defined-perimeter
Source: https://github.com/xalgord/xalgorix/tree/main/internal/tools/skills/data/zero-trust-architecture/deploying-software-defined-perimeter
Command: npx skills add https://github.com/xalgord/xalgorix --skill deploying-software-defined-perimeter

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Traditional VPNs expose broad network access once a user connects, and perimeter services remain visible to port scanners and attackers. This Skill guides the deployment of a Software-Defined Perimeter (SDP) per the CSA v2.0 specification so application infrastructure stays invisible until users are authenticated and authorized, enforcing zero trust network access aligned with NIST SP 800-207.

Core Features & Use Cases

  • SDP Controller and Gateway Deployment: Step-by-step phases covering controller setup with IdP integration (SAML/OIDC), gateway deployment with default-drop firewalls, and client enrollment.
  • Single Packet Authorization and mTLS: Implements SPA so gateways drop all unsolicited packets, plus mandatory mutual TLS with OCSP/CRL revocation checking.
  • Misconfiguration Detection and Validation: Lists common failures (SPA disabled, optional client certs, missing revocation) and provides verification steps such as port scans and replay tests.
  • Use Case: A security engineer replacing a legacy VPN uses this Skill to deploy SDP gateways in front of internal applications, then confirms with nmap that all ports show filtered to unauthorized hosts.

Quick Start

Ask the AI to walk you through deploying an SDP controller and gateway with SPA and mutual TLS for a zero trust pilot environment, including the validation checklist.

Frequently Asked Questions about deploying-software-defined-perimeter

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I deploy a Software-Defined Perimeter for zero trust access?▼

Deploy an SDP controller with IdP integration and policy definitions, then place gateways with default-drop firewalls in front of applications, and enroll clients with device certificates. Validate the flow: SPA packet, mTLS handshake, then application access.

What is Single Packet Authorization in SDP?▼

Single Packet Authorization is a mechanism where the SDP gateway drops all packets by default until it receives a cryptographically signed single packet. Only after validating that packet does it open a temporary port, making the gateway invisible to port scanners.

How is SDP different from a traditional VPN?▼

SDP creates one-to-one encrypted connections between verified users and specific applications rather than granting broad network access like a VPN. Services remain hidden until authentication and authorization complete, with no persistent tunnels.

How do I verify my SDP gateway is actually invisible?▼

Run nmap -sS -p- against the gateway from an unauthorized host without sending SPA and confirm all ports show filtered. Also attempt TLS without a client certificate, replay a captured SPA packet, and test a revoked certificate, expecting each to fail.

What are common SDP misconfigurations that break zero trust?▼

Common failures include gateways without default-drop rules, SPA disabled or using shared keys across clients, mTLS client-auth set to optional, and missing OCSP/CRL revocation checking. Each lets unauthorized users reach protected applications.

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