Infrastructure for EDA Automation: Securing a Linux Verification Server

The Intersection of EDA and DevOps

Running automated IC verification workflows (like Synopsys VCS/Verdi) or self-hosted LLM agents (OpenClaw) requires significant computational resources. Exposing a GPU or high-RAM server directly to the internet is a recipe for disaster. Constant bot scanning (Shodan, Fofa) means an unhardened server will be compromised in minutes.

As a hardware engineer, I treat server infrastructure the same way I treat hardware security: with a zero-trust architecture. Here is how I hardened my custom Linux environment to safely run EDA toolchains and AI agents.

1. System-Level Isolation (SSH & UFW)

First rule: never allow root login with a password.

# /etc/ssh/sshd_config
PermitRootLogin prohibit-password
PasswordAuthentication no
Port 52222
MaxAuthTries 3
LoginGraceTime 20

Then generate an Ed25519 key (stronger than RSA, shorter key):

ssh-keygen -t ed25519 -C "your@email.com"

UFW — only open what you need:

ufw default deny incoming
ufw default allow outgoing
ufw allow 52222/tcp  # SSH
ufw allow 80/tcp     # HTTP
ufw allow 443/tcp    # HTTPS
ufw enable

Fail2Ban — automatically ban IPs that fail authentication:

# /etc/fail2ban/jail.local
[sshd]
enabled = true
port = 52222
maxretry = 3
bantime = 3600
findtime = 600

2. Process-Level Isolation (Rootless Docker & Cgroups)

Running containerized LLM agents or compilation workflows requires strict resource boundaries. A container escape in a hardware verification cluster could compromise proprietary RTL designs.

Rootless Docker — the single most impactful security change:

# Install rootless Docker
dockerd-rootless-setuptool.sh install

# Verify
docker context use rootless
docker info | grep -i root
# Security Options: rootless

Now even if an attacker escapes the container, they get your user — not root.

Resource limits — never let a container go unbounded:

services:
  eda-runner:
    image: eda-tools:latest
    deploy:
      resources:
        limits:
          memory: 512M
          cpus: '0.5'
    mem_swappiness: 0
    read_only: true
    tmpfs:
      - /tmp

3. Nginx Security Headers

add_header Strict-Transport-Security "max-age=31536000; includeSubDomains; preload" always;
add_header X-Content-Type-Options "nosniff" always;
add_header X-Frame-Options "DENY" always;
add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline';" always;
add_header Referrer-Policy "strict-origin-when-cross-origin" always;

The CSP is the most powerful one. It prevents XSS by controlling exactly where scripts, styles, and resources can load from.

---

Building reliable silicon requires reliable infrastructure. Security isn’t an afterthought; it’s the foundation.