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- Add scripts/agent.py and references/api-reference.md to all remaining skills - Update all 648 LICENSE files: copyright now reads 'Mahipal' - Add implementing-security-monitoring-with-datadog (new skill with full anatomy) - All 649 skills now have: SKILL.md, LICENSE, scripts/agent.py, references/api-reference.md
52 lines
1.4 KiB
Markdown
52 lines
1.4 KiB
Markdown
# API Reference: Implementing DMARC/DKIM/SPF Email Security
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## dnspython Lookups
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```python
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import dns.resolver
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# SPF
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answers = dns.resolver.resolve("example.com", "TXT")
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# DMARC
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answers = dns.resolver.resolve("_dmarc.example.com", "TXT")
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# DKIM
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answers = dns.resolver.resolve("selector._domainkey.example.com", "TXT")
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```
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## SPF Record Syntax
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| Mechanism | Example | Meaning |
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|-----------|---------|---------|
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| `include:` | `include:_spf.google.com` | Authorize sender |
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| `ip4:` | `ip4:203.0.113.0/24` | Allow IP range |
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| `-all` | End of record | Hard fail others |
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| `~all` | End of record | Soft fail (weak) |
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| `+all` | End of record | Allow all (insecure) |
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## DMARC Policy Levels
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| Policy | Action | Severity if Missing |
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|--------|--------|---------------------|
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| `p=reject` | Reject failing mail | Recommended |
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| `p=quarantine` | Send to spam | Acceptable |
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| `p=none` | Monitor only | HIGH risk |
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## Recommended DNS Records
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```
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# SPF
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v=spf1 include:_spf.google.com -all
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# DMARC
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v=DMARC1; p=reject; pct=100; rua=mailto:dmarc@example.com; adkim=s; aspf=s
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# DKIM (provider-specific key)
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selector._domainkey.example.com TXT "v=DKIM1; k=rsa; p=MIIBIjAN..."
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```
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### References
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- SPF RFC 7208: https://www.rfc-editor.org/rfc/rfc7208
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- DMARC RFC 7489: https://www.rfc-editor.org/rfc/rfc7489
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- DKIM RFC 6376: https://www.rfc-editor.org/rfc/rfc6376
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- dnspython: https://dnspython.readthedocs.io/
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