Securing the CloudFront Edge
Use the global edge to terminate and protect inbound traffic.
Securing the CloudFront Edge is a free AWS Security Academy lesson on CoddyKit — lesson 4 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the AWS Security Academy learning path, one of 4 lessons in the course, and your progress syncs across the web and the CoddyKit app.
CloudFront as Security Edge
Amazon CloudFront is the AWS content delivery network (CDN) that serves content from global edge locations. Beyond speed, it is a powerful security boundary: it terminates connections at the edge, absorbs DDoS via Shield, hosts WAF inspection, and hides your origin from direct exposure.
TLS Termination at the Edge
CloudFront terminates TLS at the nearest edge location, encrypting traffic between users and the edge with modern protocols and ciphers you configure via a security policy. You can also enforce HTTPS-only by redirecting HTTP to HTTPS, ensuring data in transit is always encrypted.
Certificates with ACM
CloudFront uses certificates from AWS Certificate Manager (ACM) for HTTPS on your custom domains. Certificates for CloudFront must be requested in us-east-1 regardless of where your origin lives, a detail the exam likes to test. ACM also auto-renews these certificates.
WAF and Shield Integration
CloudFront integrates tightly with AWS WAF (attach a CLOUDFRONT-scope web ACL) and AWS Shield (Standard free, Advanced optional). This lets you inspect and rate-limit requests and absorb DDoS floods at the edge, before traffic ever reaches your regional infrastructure.
Origin Access Control
For S3 origins, Origin Access Control (OAC) locks the bucket so it is reachable only through CloudFront, not directly. The bucket stays private while CloudFront signs requests to it. OAC replaces the older Origin Access Identity (OAI) and supports features like SSE-KMS and all Regions.
# S3 bucket policy with OAC (concept)
Allow s3:GetObject
Principal: cloudfront.amazonaws.com
Condition: SourceArn = <distribution ARN>Protecting Custom Origins
For ALB or custom origins, prevent direct access by restricting the origin to CloudFront IP ranges or verifying a custom secret header that CloudFront adds and the origin (or its WAF) checks. This ensures requests cannot bypass CloudFront edge protections.
Signed URLs and Cookies
To restrict access to private content, CloudFront supports signed URLs and signed cookies. Only requests carrying a valid signature, optionally time-limited and IP-restricted, can fetch the content. This protects paid or sensitive media without exposing the origin or requiring per-object bucket policies.
Geo Restriction
CloudFront geo restriction can allow or block viewers by country at the edge. This enforces licensing or compliance boundaries before requests reach your application. For finer control, a WAF geo-match rule offers the same idea with the flexibility to combine geography with other conditions.
Field-Level Encryption
CloudFront field-level encryption encrypts specific sensitive form fields (like a credit card number) at the edge using a public key, so the data stays encrypted through your stack until decrypted by the authorized service. This protects sensitive fields even from your own intermediate components.
CloudFront Functions and Lambda@Edge
CloudFront Functions and Lambda@Edge run code at edge locations to add security headers, validate tokens, or normalize requests before they reach the origin. They let you enforce security logic globally with low latency, such as adding HSTS or rewriting suspicious requests.
The Edge Security Stack
A hardened CloudFront edge combines HTTPS-only with ACM, WAF, Shield, OAC or origin lockdown, signed URLs, geo restriction, and edge functions. Together they make the edge the primary enforcement boundary, keeping the origin private and attacks filtered before they reach your core infrastructure.
Quick Check
Apply CloudFront edge-security knowledge.
Recap
CloudFront is a security edge: it terminates TLS with ACM certificates (requested in us-east-1), hosts WAF and Shield, and hides the origin. Use Origin Access Control (OAC) to keep S3 private, lock custom origins with IP ranges or secret headers, restrict content with signed URLs/cookies and geo restriction, and run security logic via CloudFront Functions or Lambda@Edge.
Frequently asked questions
Is the “Securing the CloudFront Edge” lesson free?
Yes — the full text of “Securing the CloudFront Edge” is free to read here on the web, and the AWS Security Academy course includes 4 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the AWS Security Academy course, upgrade to CoddyKit PRO.
What will I learn in “Securing the CloudFront Edge”?
Use the global edge to terminate and protect inbound traffic. You practise AWS Security Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.
Do I need any experience to start AWS Security Academy?
No prior experience is required. AWS Security Academy on CoddyKit is structured for beginners through advanced learners; this is — lesson 4 of 4, so you can start here or from the beginning and move at your own pace.
How long does the “Securing the CloudFront Edge” lesson take?
Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.
Can I write and run code in this AWS Security Academy lesson?
Yes. Every AWS Security Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.
All lessons in this course
- What AWS Network Firewall Provides
- Stateful Rule Groups and Suricata Rules
- Domain Filtering and Egress Control
- Securing the CloudFront Edge