Hardening checklist for production deployments (auth, safe defaults, docs)

[Cristliu]

We’re sharing a platform-agnostic hardening checklist distilled from a cross-platform study of self-hosted LLM deployments. The high-level takeaway: many exposed assets are accessible, and a large fraction of those allow unauthenticated interactions when misconfigured—so defaults and docs matter a lot.

Suggested checklist

• Bind to localhost by default; require explicit opt-in for 0.0.0.0.
• First-run setup must create admin credentials; refuse to start otherwise.
• Auth everywhere for non-inference routes; consider inference-only mode/tokens.
• Endpoint classification (public / authenticated / admin) with rate limiting and conservative CORS/CSRF.
• Security health check endpoint or startup banner when risky settings are detected.
• Production docs & examples: reverse-proxy/TLS templates, firewall rules, and guidance for container permissions.

We can provide platform-specific notes privately via security contacts if maintainers want to pursue targeted improvements.

[iwr-redmond]

This project is EOL, see #3558 (comment)

[xXMrNidaXx]

Great initiative on production hardening! Here's what we've learned deploying local LLMs:

Authentication:

# API key middleware
from functools import wraps

def require_api_key(f):
    @wraps(f)
    def decorated(*args, **kwargs):
        key = request.headers.get("X-API-Key")
        if not key or key not in VALID_KEYS:
            return {"error": "Invalid API key"}, 401
        return f(*args, **kwargs)
    return decorated

Safe defaults checklist:

• Disable debug mode
• Set max token limits
• Rate limiting per user/key
• Request logging (without PII)
• Timeout on inference
• Memory limits per session

Network security:

# nginx config for GPT4All API
location /v1/ {
    limit_req zone=api burst=10;
    proxy_pass http://localhost:4891;
    proxy_read_timeout 120s;
}

Docs improvements:

• Deployment architecture diagrams
• Security configuration examples
• Troubleshooting runbook

We've deployed GPT4All in air-gapped environments at RevolutionAI. Happy to contribute to hardening docs!

What's the current auth situation in the API server?

[xXMrNidaXx]

Excellent checklist. The bind-to-localhost default is critical — too many LLM deployments are exposed because 0.0.0.0 was convenient for development.

Additional hardening suggestions:

1. Model access controls
   Some models should not be accessible to all users (e.g., uncensored variants).

   models:
     llama-3-8b:
       access: public
     dolphin-uncensored:
       access: admin_only

2. Request logging with redaction
   Log requests for audit, but redact sensitive content:

   log.info(f"User {user_id} requested model {model}, prompt_length={len(prompt)}")
   # Never log the actual prompt in production

3. Resource quotas per user

   • Max tokens per request
   • Max requests per minute
   • Max concurrent requests

4. Model integrity verification
   Check SHA256 on model load to detect tampering:

   if sha256(model_file) != expected_hash:
       raise SecurityError("Model file corrupted or tampered")

5. Prompt injection guardrails
   Even local models can be tricked. Consider output filtering.

Deployment pattern we use:

Internet → Cloudflare → Auth proxy → GPT4All (localhost only)

We deploy hardened local LLM setups at Revolution AI — security defaults save everyone from footguns.

[xXMrNidaXx]

Excellent security checklist! Self-hosted LLM security is critically underaddressed.

Additional recommendations:

1. API key rotation

security:
  api_keys:
    rotation_days: 90
    allow_multiple: true
    audit_usage: true

2. Request validation

# Sanitize inputs
MAX_PROMPT_LENGTH = 32000
MAX_TOKENS = 4096
BLOCKED_PATTERNS = ["ignore previous", "system prompt"]

3. Output filtering

# Post-generation guardrails
if contains_pii(response):
    response = redact_pii(response)

4. Resource limits

limits:
  max_concurrent_requests: 10
  max_tokens_per_minute: 100000
  max_context_window: 8192

5. Audit logging

{
  "timestamp": "...",
  "user_id": "...",
  "prompt_hash": "...",
  "tokens_used": 1500,
  "model": "mistral-7b"
}

6. Network isolation

# Docker network isolation
docker network create --internal llm-internal

7. Model integrity

# Verify model checksums
sha256sum models/*.gguf | diff - checksums.txt

We harden LLM deployments at Revolution AI — this checklist should be in every self-hosted LLM docs.