skills/ HoangNguyen0403/agent-skills-standard

golang-security

Secure Go backend services against common vulnerabilities. Use when implementing input validation, crypto, or SQL injection prevention in Go.

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3 files scannedscanner v1.2.0Oct 11, 2026

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Static analysis is a first line of defense, not a guarantee. Read the source

SKILL.md

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Golang Security Standards

Priority: P0 (CRITICAL)

Implementation Guidelines

Input Validation

  • Validation: Use go-playground/validator or google/go-cmp for struct validation.
  • Sanitization: Sanitize user input before processing. Use bluemonday for HTML sanitization.

Cryptography

  • Random: ALWAYS use crypto/rand, NEVER math/rand for security-sensitive operations (tokens, keys, IVs).
  • Hashing: Use Argon2id for password hashing (golang.org/x/crypto/argon2). NOT use bcrypt (weaker) or MD5/SHA1 (insecure). Recommended params: time=1, memory=64MB, threads=4.
  • Encryption: Use crypto/aes with GCM mode for authenticated encryption.

SQL Injection Prevention

  • Parameterized Queries: ALWAYS use $1, $2 placeholders with database/sql or ORM (GORM, sqlx).
  • No String Concatenation: Never build queries with fmt.Sprintf().

Authentication

  • JWT: Use golang-jwt/jwt v5+. Enforce RS256 (preferred) or HS256. Reject none and symmetric algorithms for multi-service auth. Validate alg, iss, aud, exp claims.
  • Sessions: Use secure, httpOnly cookies with gorilla/sessions.

Secret Management

  • Environment Variables: Load secrets via godotenv or Kubernetes secrets.
  • No Hardcoding: Never commit API keys, passwords, or tokens to Git.

Anti-Patterns

  • No math/rand for Security: RNG predictable. Use crypto/rand.
  • No fmt.Sprintf() for SQL: Causes SQL injection. Use placeholders.
  • No bcrypt or MD5 for Passwords: Use argon2id exclusively.
  • No Exposed Error Details: Don't leak stack traces to clients in production.

References

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