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mukul975
cb8d79e068
- Add validated mitre_attack frontmatter to all 754 skills (286 distinct techniques), verified against MITRE ATT&CK v19.1 via the official mitreattack-python library: 0 revoked, deprecated, or invalid IDs - Curate precise per-skill technique IDs for forensics, malware-analysis, threat-intel, and red-team skills (e.g. DCSync -> T1003.006, Kerberoasting -> T1558.003, Pass-the-Ticket -> T1550.003) - Reconcile v19.1 tactic restructuring: Defense Evasion split into Stealth (TA0005) and Defense Impairment (TA0112); revoked T1562.* family and T1070.001/.002 remapped to active equivalents (T1685.*) - Normalize word-split tags across 35 skills (remove filename-derived stopword tags, add semantic cybersecurity tags) - Add api-reference.md for 3 skills that were missing it - Update README ATT&CK section with accurate v19.1 tactic distribution
101 lines
3.2 KiB
Markdown
101 lines
3.2 KiB
Markdown
---
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name: configuring-certificate-authority-with-openssl
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description: A Certificate Authority (CA) is the trust anchor in a PKI hierarchy,
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responsible for issuing, signing, and revoking digital certificates. This skill
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covers building a two-tier CA hierarchy (Root CA +
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domain: cybersecurity
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subdomain: cryptography
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tags:
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- cryptography
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- pki
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- certificate-authority
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- openssl
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- x509
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version: '1.0'
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author: mahipal
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license: Apache-2.0
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nist_csf:
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- PR.DS-01
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- PR.DS-02
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- PR.DS-10
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mitre_attack:
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- T1649
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- T1553.004
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- T1557
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- T1587.003
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---
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# Configuring Certificate Authority with OpenSSL
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## Overview
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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.
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## When to Use
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- When deploying or configuring configuring certificate authority with openssl capabilities in your environment
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- When establishing security controls aligned to compliance requirements
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- When building or improving security architecture for this domain
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- When conducting security assessments that require this implementation
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## Prerequisites
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- Familiarity with cryptography concepts and tools
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- Access to a test or lab environment for safe execution
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- Python 3.8+ with required dependencies installed
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- Appropriate authorization for any testing activities
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## Objectives
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- Create a Root CA with self-signed certificate
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- Create an Intermediate CA signed by the Root CA
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- Issue server and client certificates from the Intermediate CA
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- Configure Certificate Revocation Lists (CRLs)
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- Implement certificate policies and constraints
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- Build a complete PKI hierarchy programmatically
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## Key Concepts
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### CA Hierarchy
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```
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Root CA (offline, air-gapped)
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+-- Intermediate CA (online, operational)
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+-- Server Certificates
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+-- Client Certificates
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+-- Code Signing Certificates
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```
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### Certificate Extensions
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| Extension | Purpose | Critical |
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|-----------|---------|----------|
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| basicConstraints | CA:TRUE/FALSE, pathLenConstraint | Yes |
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| keyUsage | keyCertSign, cRLSign, digitalSignature | Yes |
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| extendedKeyUsage | serverAuth, clientAuth, codeSigning | No |
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| subjectKeyIdentifier | Hash of public key | No |
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| authorityKeyIdentifier | Issuer's key identifier | No |
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| crlDistributionPoints | URL to CRL | No |
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| authorityInfoAccess | OCSP responder URL | No |
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## Security Considerations
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- Root CA private key must be stored offline (air-gapped HSM)
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- Use minimum 4096-bit RSA or P-384 ECDSA for CA keys
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- Set path length constraints on intermediate CAs
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- Implement certificate policies (OIDs)
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- Enable CRL and OCSP for revocation checking
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- Audit all certificate issuance operations
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## Validation Criteria
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- [ ] Root CA self-signed certificate is valid
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- [ ] Intermediate CA certificate chains to Root CA
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- [ ] Issued certificates chain to Intermediate -> Root
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- [ ] Path length constraints are enforced
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- [ ] CRL is generated and accessible
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- [ ] Revoked certificates appear in CRL
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- [ ] Certificate policies are correctly embedded
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