WAF Setup

Protect web applications with Web Application Firewalls.

AWS WAF

# Create Web ACL
aws wafv2 create-web-acl \
  --name my-waf \
  --scope REGIONAL \
  --default-action Allow={} \
  --rules file://rules.json

# Associate with ALB
aws wafv2 associate-web-acl \
  --web-acl-arn arn:aws:wafv2:... \
  --resource-arn arn:aws:elasticloadbalancing:...

ModSecurity (nginx)

# nginx.conf
load_module modules/ngx_http_modsecurity_module.so;

server {
  modsecurity on;
  modsecurity_rules_file /etc/nginx/modsec/main.conf;
}

# Install OWASP CRS
git clone https://github.com/coreruleset/coreruleset /etc/nginx/modsec/crs

Cloudflare WAF

# Enable managed rules via API
curl -X PUT "https://api.cloudflare.com/client/v4/zones/{zone}/firewall/waf/packages/{package}/rules/{rule}" \
  -H "Authorization: Bearer $TOKEN" \
  -d '{"mode":"block"}'

Common Rules

protections:
  - SQL Injection (SQLi)
  - Cross-Site Scripting (XSS)
  - Remote File Inclusion (RFI)
  - Local File Inclusion (LFI)
  - Command Injection
  - Cross-Site Request Forgery (CSRF)

Best Practices

• Start in detection mode
• Tune for false positives
• Monitor blocked requests
• Regular rule updates
• Custom rules for app-specific attacks

Related Skills

• dast-scanning - Web security testing
• ssl-tls-management - HTTPS configuration