Individual skill

protocol-security

Transport security where the client establishes trust: TLS version floor, certificate chain and hostname verification, the trust store, connecting by IP, mTLS and workload identity as authentication, gRPC channel credentials, and SMTP STARTTLS. Use when generating HTTP, gRPC, or SMTP clients and servers, configuring TLS in code or platform config, wiring service-to-service authentication, or when tempted to disable certificate verification.

skills/protocol-security/SKILL.md

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Last checked: Nov 6, 2026

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Repository stars (not skill ratings): 23
Repository last updated: Aug 14, 2026
License: MIT

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claude-skills Repository topic
llm Repository topic
security Repository topic
skills Repository topic
security Derived category

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SKILL.mdcore · 8,118 bytes
SKILL.mdcore · 8,118 bytes
references/tls-configuration.mddoc · 9,194 bytes
references/verifying-findings.mddoc · 4,018 bytes
rules/cert_validation_sinks.jsonasset · 2,302 bytes
rules/tls_defaults.jsonasset · 1,276 bytes
tests/corpus.jsonasset · 3,821 bytes

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# Protocol Security

## Rules (for AI agents)

### ALWAYS
- Default to **TLS 1.3**, and permit TLS 1.2 only where a peer genuinely requires it.
  Disable TLS 1.0, 1.1, and every SSL version. Cipher-suite selection is a
  consequence of the version floor rather than a separate decision —
  `references/tls-configuration.md` carries the suite lists and the per-platform
  config keys.
- Verify the full certificate chain on every connection: a trusted issuer, an
  unexpired validity window, and a hostname that matches a **`subjectAltName`
  dNSName** entry. The hostname is checked *against* the SAN — SAN is not an
  alternative place to look, and a `CN` match is not a fallback, because current