Brenno de Winter f93417dc3c Add fail-closed export classification gate (release ceiling)

Enforce an optional TLP release ceiling at the single export chokepoint
so no format (PDF/PPTX/HTML) can bypass it. Classifying a deck stays
optional; the gate only blocks decks classified above the configured
ceiling, and is off by default.

- ClassificationPolicy + ExportDecision: pure, tested decision logic
  (release ceiling, fail-closed; null = no gate).
- ExportService.export() evaluates the policy first and refuses without
  building or writing anything when blocked.
- Persist the ceiling as maxReleaseExportTlpKey in app settings/prefs
  (default off) with a setter on SettingsNotifier.
- Export dialog runs the same check up front and explains a blocked
  export before any work starts; app shell builds the policy from
  settings.
- Tests: classification_policy_test plus export_service chokepoint tests
  asserting a blocked export fails and writes no file.
- Docs: CHANGELOG, README, USER_GUIDE, ARCHITECTURE, SECURITY.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

2026-06-12 00:26:29 +02:00

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Security Policy

Reporting a vulnerability

Please do not report security vulnerabilities through public GitHub issues, discussions, or pull requests.

Instead, report them privately via GitHub's "Report a vulnerability" button under the repository's Security tab (Security Advisories). If that is not available to you, contact the maintainer directly and wait for a reply before disclosing anything publicly.

When reporting, please include as much of the following as you can:

A description of the issue and its impact.
Steps to reproduce (a minimal deck or input file if relevant).
The OciDeck version, operating system, and Flutter version.
Any proof-of-concept, logs, or screenshots.

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Acknowledgement of your report as quickly as we reasonably can.
An assessment and, where confirmed, a fix developed under coordinated (responsible) disclosure.
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Scope notes

OciDeck is an offline desktop application. Areas of particular interest:

Parsing of untrusted decks (.md), packages (.ocideck), sidecars (.ink.json, captions), and linked CSV data.
Importing presentations from a URL.
The HTML export, which inlines third-party JavaScript (marked, highlight.js, mermaid, MathJax) to render offline.
The export classification gate (ClassificationPolicy) — any way to export a deck classified above the configured release ceiling.

Supported versions

Security fixes target the latest released version and the default development branch. Older versions may not receive fixes.