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configuring-certificate-authority-with-openssl

Build a two-tier certificate authority with OpenSSL and Python, separating the offline root from the issuing authority. Covers server and client certificates, revocation checks, and policies that define certificate usage and trust.

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원문원문 설명 보기

Build a two-tier PKI Certificate Authority hierarchy (offline Root CA plus issuing Intermediate CA) using OpenSSL and the Python cryptography library, covering certificate extensions, CRL distribution points, OCSP responder configuration, and certificate policy management. Use when standing up an internal CA, issuing or revoking X.509 certificates, or designing PKI trust hierarchies for TLS, code-signing, or client-authentication use cases.

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설치 방법 보기

이럴 때 유용합니다

  • Set up an internal certificate authority
  • Issue server and client certificates
  • Configure certificate revocation checks
  • Review certificate policies and trust chains

포함된 파일(8)

  • SKILL.md3.4 KB
  • assets/template.md1.7 KB
  • LICENSE11.0 KB
  • references/api-reference.md1.7 KB
  • references/standards.md1.2 KB
  • references/workflows.md2.2 KB
  • scripts/agent.py5.9 KB
  • scripts/process.py16.9 KB

SKILL.md(원문)

설치하기 전에 에이전트에게 전달되는 지시 내용을 확인할 수 있습니다.

Configuring Certificate Authority with OpenSSL

Overview

A Certificate Authority (CA) is the trust anchor in a PKI hierarchy, responsible for issuing, signing, and revoking digital certificates. This skill covers building a two-tier CA hierarchy (Root CA + Intermediate CA) using OpenSSL and the Python cryptography library, including CRL distribution, OCSP responder configuration, and certificate policy management.

When to Use

  • When deploying or configuring configuring certificate authority with openssl capabilities in your environment
  • When establishing security controls aligned to compliance requirements
  • When building or improving security architecture for this domain
  • When conducting security assessments that require this implementation

Prerequisites

  • Familiarity with cryptography concepts and tools
  • Access to a test or lab environment for safe execution
  • Python 3.8+ with required dependencies installed
  • Appropriate authorization for any testing activities

Objectives

  • Create a Root CA with self-signed certificate
  • Create an Intermediate CA signed by the Root CA
  • Issue server and client certificates from the Intermediate CA
  • Configure Certificate Revocation Lists (CRLs)
  • Implement certificate policies and constraints
  • Build a complete PKI hierarchy programmatically

Key Concepts

CA Hierarchy

Root CA (offline, air-gapped)
  |
  +-- Intermediate CA (online, operational)
        |
        +-- Server Certificates
        +-- Client Certificates
        +-- Code Signing Certificates

Certificate Extensions

ExtensionPurposeCritical
basicConstraintsCA:TRUE/FALSE, pathLenConstraintYes
keyUsagekeyCertSign, cRLSign, digitalSignatureYes
extendedKeyUsageserverAuth, clientAuth, codeSigningNo
subjectKeyIdentifierHash of public keyNo
authorityKeyIdentifierIssuer's key identifierNo
crlDistributionPointsURL to CRLNo
authorityInfoAccessOCSP responder URLNo

Security Considerations

  • Root CA private key must be stored offline (air-gapped HSM)
  • Use minimum 4096-bit RSA or P-384 ECDSA for CA keys
  • Set path length constraints on intermediate CAs
  • Implement certificate policies (OIDs)
  • Enable CRL and OCSP for revocation checking
  • Audit all certificate issuance operations

Validation Criteria

  • Root CA self-signed certificate is valid
  • Intermediate CA certificate chains to Root CA
  • Issued certificates chain to Intermediate -> Root
  • Path length constraints are enforced
  • CRL is generated and accessible
  • Revoked certificates appear in CRL
  • Certificate policies are correctly embedded

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