Cloudline Press - Security

This document describes the security model of the Cloudline Press reference implementation.

It explains which threats the system is designed to mitigate, which are intentionally out of scope, and how responsibility is divided between the publishing system and the host environment.

Cloudline Press emphasizes structural security over reactive controls.

Security Philosophy

Cloudline Press is designed around the idea that the safest system is one that has very little to attack.

Rather than layering defensive mechanisms onto a complex runtime, the system reduces exposure by eliminating entire categories of risk.

This is achieved through:

• static output only
• build-time transformation
• absence of user input
• absence of runtime execution
• minimal trust boundaries

Security is primarily architectural.

Threat Model

Cloudline Press assumes the following threat environment:

• public internet exposure
• untrusted networks between readers and server
• upstream publishing platforms that may change behavior
• long-lived published content
• read-only public access

The system does not assume trusted clients.

Attack Surface

The public attack surface consists of:

• static HTML files
• static assets
• Apache configuration

There is no:

• application server
• database
• template engine
• interpreter execution
• form submission
• session handling
• authentication system

This significantly reduces risk.

Runtime Elimination

Cloudline Press performs no computation at request time.

This eliminates common attack vectors including:

• injection attacks
• request forgery
• template traversal
• remote code execution
• deserialization vulnerabilities

If a page can be served, it can also be inspected on disk.

There is no hidden behavior.

Transport Layer Security

Role of TLS

Transport Layer Security is fundamental to the security model.

Without TLS, static content remains vulnerable to:

• interception
• modification
• impersonation
• silent substitution

Even read-only sites require encryption to preserve integrity.

Threats mitigated by TLS

TLS protects against:

• man-in-the-middle attacks
• injected scripts
• altered documents
• modified contact information
• false attribution

Readers must receive exactly what was published.

Trust signaling

TLS also functions as a trust signal.

Modern browsers treat non-HTTPS sites as degraded.

For publishing systems intended to be referenced, printed, or archived, this trust signal is essential.

Responsibility boundary

Cloudline Press does not manage certificates.

Certificate issuance and renewal are the responsibility of the host environment.

This boundary is intentional.

Security controls that must persist across deployments should not be embedded inside edition logic.

Certificate Lifecycle Safety

Certificates are typically issued via ACME.

ACME validation paths must remain stable across editions.

For this reason:

• challenge paths must exist outside release directories
• infrastructure configuration must be independent of publication

Failure to maintain this boundary can result in certificate expiration and site unavailability.

Deployment documentation addresses this in detail.

Content Integrity

Cloudline Press protects content integrity through:

• build-time normalization
• immutable editions
• atomic activation
• explicit rollback

Once an edition is published, it does not change.

This prevents silent modification of public material.

Upstream Trust Boundary

Upstream publishing platforms are treated as untrusted after ingestion.

Cloudline Press assumes that upstream platforms may:

• change HTML structure
• modify styling
• introduce branding
• alter scripts
• become unavailable

Normalization removes upstream influence before publication.

Cached content becomes authoritative.

Print Integrity

Printed output is treated as part of the security model.

A printed page should reflect the published content accurately.

For this reason:

• layout must be predictable
• links must be visible
• typography must not shift dynamically

Print failures are considered integrity failures.

Operator Responsibilities

Operators are responsible for:

• securing the host operating system
• maintaining Apache updates
• enforcing HTTPS
• managing certificate renewal
• restricting write access
• protecting private keys
• monitoring disk usage

Cloudline Press assumes a competent host environment.

Out-of-Scope Threats

The following are intentionally out of scope:

• denial-of-service mitigation
• intrusion detection
• user authentication
• access control beyond static serving
• content moderation
• malicious administrator behavior

These concerns belong to infrastructure or organizational policy, not the publishing system.

Security Through Simplicity

Cloudline Press relies on simplicity as a security control.

By reducing moving parts, it becomes easier to:

• reason about behavior
• audit files
• detect anomalies
• recover from failure

Complexity is avoided wherever possible.

The Cloudline Press security model is based on:

• static-only publishing
• immutable editions
• HTTPS enforcement
• strict responsibility boundaries
• minimal trust assumptions

The system does not attempt to be invulnerable.

It aims to be understandable.

Understandable systems are easier to secure and easier to trust.