mirror of
https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git
synced 2026-08-04 18:00:18 +03:00
Mahipal
2fb6a9faff
Each rewritten description now states both what the skill does (concrete capability, named tools/artifacts) and an explicit when-to-use trigger, improving agent discovery/activation. Grounded in each skill's own body; changes confined to the `description` field only (bodies and all other frontmatter untouched). Produced by a gated audit->rewrite->recheck loop (548 -> 0 flagged) with a sampled anti-invention check (0 ungrounded). Schema: 817/817 pass. Framework-ID gate: 0 defects.
104 lines
3.4 KiB
Markdown
104 lines
3.4 KiB
Markdown
---
|
|
name: configuring-certificate-authority-with-openssl
|
|
description: 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.
|
|
domain: cybersecurity
|
|
subdomain: cryptography
|
|
tags:
|
|
- cryptography
|
|
- pki
|
|
- certificate-authority
|
|
- openssl
|
|
- x509
|
|
version: '1.0'
|
|
author: mahipal
|
|
license: Apache-2.0
|
|
nist_csf:
|
|
- PR.DS-01
|
|
- PR.DS-02
|
|
- PR.DS-10
|
|
mitre_attack:
|
|
- T1649
|
|
- T1553.004
|
|
- T1557
|
|
- T1587.003
|
|
---
|
|
# 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
|
|
|
|
| Extension | Purpose | Critical |
|
|
|-----------|---------|----------|
|
|
| basicConstraints | CA:TRUE/FALSE, pathLenConstraint | Yes |
|
|
| keyUsage | keyCertSign, cRLSign, digitalSignature | Yes |
|
|
| extendedKeyUsage | serverAuth, clientAuth, codeSigning | No |
|
|
| subjectKeyIdentifier | Hash of public key | No |
|
|
| authorityKeyIdentifier | Issuer's key identifier | No |
|
|
| crlDistributionPoints | URL to CRL | No |
|
|
| authorityInfoAccess | OCSP responder URL | No |
|
|
|
|
## 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
|