dlus

Projects that follow the best practices below can voluntarily self-certify and show that they've achieved an Open Source Security Foundation (OpenSSF) best practices badge.

There is no set of practices that can guarantee that software will never have defects or vulnerabilities; even formal methods can fail if the specifications or assumptions are wrong. Nor is there any set of practices that can guarantee that a project will sustain a healthy and well-functioning development community. However, following best practices can help improve the results of projects. For example, some practices enable multi-person review before release, which can both help find otherwise hard-to-find technical vulnerabilities and help build trust and a desire for repeated interaction among developers from different companies. To earn a badge, all MUST and MUST NOT criteria must be met, all SHOULD criteria must be met OR be unmet with justification, and all SUGGESTED criteria must be met OR unmet (we want them considered at least). If you want to enter justification text as a generic comment, instead of being a rationale that the situation is acceptable, start the text block with '//' followed by a space. Feedback is welcome via the GitHub site as issues or pull requests There is also a mailing list for general discussion.

We gladly provide the information in several locales, however, if there is any conflict or inconsistency between the translations, the English version is the authoritative version.
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These are the Silver level criteria. You can also view the Passing or Gold level criteria.

Baseline Series: Baseline Level 1 Baseline Level 2 Baseline Level 3

        

 Basics 17/17 ●

  • General

    Note that other projects may use the same name.

    Downloads, streams and controls your LG TV from your Mac. A resumable download manager with a 4K HDR TV player, subtitle auto-sync, a remote and a network router for your TV.

    Please use SPDX license expression format; examples include "Apache-2.0", "BSD-2-Clause", "BSD-3-Clause", "GPL-2.0+", "LGPL-3.0+", "MIT", and "(BSD-2-Clause OR Ruby)". Do not include single quotes or double quotes.
    If there is more than one language, list them as comma-separated values (spaces optional) and sort them from most to least used. If there is a long list, please list at least the first three most common ones. If there is no language (e.g., this is a documentation-only or test-only project), use the single character "-". Please use a conventional capitalization for each language, e.g., "JavaScript".
    The Common Platform Enumeration (CPE) is a structured naming scheme for information technology systems, software, and packages. It is used in a number of systems and databases when reporting vulnerabilities.

  • Prerequisites


    Enough for a badge!

    The project MUST achieve a passing level badge. [achieve_passing]

  • Basic project website content


    Enough for a badge!

    The information on how to contribute MUST include the requirements for acceptable contributions (e.g., a reference to any required coding standard). (URL required) [contribution_requirements]

    https://github.com/amahbadi/dlus/blob/main/CONTRIBUTING.md#-pull-requests - the code standard (Python 3.9+, standard library only, PEP 8 style, no shell=True, network input always checked, ShellCheck clean), the required checks, and the test policy (new features and fixes need tests).


  • Project oversight


    Enough for a badge!

    The project SHOULD have a legal mechanism where all developers of non-trivial amounts of project software assert that they are legally authorized to make these contributions. The most common and easily-implemented approach for doing this is by using a Developer Certificate of Origin (DCO), where users add "signed-off-by" in their commits and the project links to the DCO website. However, this MAY be implemented as a Contributor License Agreement (CLA), or other legal mechanism. (URL required) [dco]
    The DCO is the recommended mechanism because it's easy to implement, tracked in the source code, and git directly supports a "signed-off" feature using "commit -s". To be most effective it is best if the project documentation explains what "signed-off" means for that project. A CLA is a legal agreement that defines the terms under which intellectual works have been licensed to an organization or project. A contributor assignment agreement (CAA) is a legal agreement that transfers rights in an intellectual work to another party; projects are not required to have CAAs, since having CAA increases the risk that potential contributors will not contribute, especially if the receiver is a for-profit organization. The Apache Software Foundation CLAs (the individual contributor license and the corporate CLA) are examples of CLAs, for projects which determine that the risks of these kinds of CLAs to the project are less than their benefits.

    https://github.com/amahbadi/dlus/blob/main/GOVERNANCE.md#-developer-certificate-of-origin-dco - every commit must be signed off ("git commit -s") under the Developer Certificate of Origin 1.1 (https://developercertificate.org/); a DCO check enforces it on every pull request: https://github.com/amahbadi/dlus/blob/main/.github/workflows/dco.yml


    Enough for a badge!

    The project MUST clearly define and document its project governance model (the way it makes decisions, including key roles). (URL required) [governance]
    There needs to be some well-established documented way to make decisions and resolve disputes. In small projects, this may be as simple as "the project owner and lead makes all final decisions". There are various governance models, including benevolent dictator and formal meritocracy; for more details, see Governance models. Both centralized (e.g., single-maintainer) and decentralized (e.g., group maintainers) approaches have been successfully used in projects. The governance information does not need to document the possibility of creating a project fork, since that is always possible for FLOSS projects.

    https://github.com/amahbadi/dlus/blob/main/GOVERNANCE.md - maintainer-led governance: how decisions are made (public issues, pull requests with required checks and reviews, final decision by the maintainer with reasons), key roles (maintainer, successor, reviewer, contributor), continuity, and how the governance itself changes.


    Enough for a badge!

    The project MUST adopt a code of conduct and post it in a standard location. (URL required) [code_of_conduct]
    Projects may be able to improve the civility of their community and to set expectations about acceptable conduct by adopting a code of conduct. This can help avoid problems before they occur and make the project a more welcoming place to encourage contributions. This should focus only on behavior within the community/workplace of the project. Example codes of conduct are the Linux kernel code of conduct, the Contributor Covenant Code of Conduct, the Debian Code of Conduct, the Ubuntu Code of Conduct, the Fedora Code of Conduct, the GNOME Code Of Conduct, the KDE Community Code of Conduct, the Python Community Code of Conduct, The Ruby Community Conduct Guideline, and The Rust Code of Conduct.

    https://github.com/amahbadi/dlus/blob/main/CODE_OF_CONDUCT.md - the Contributor Covenant 2.1, in the standard location (repository root), with a private way to report problems to the maintainer.


    Enough for a badge!

    The project MUST clearly define and publicly document the key roles in the project and their responsibilities, including any tasks those roles must perform. It MUST be clear who has which role(s), though this might not be documented in the same way. (URL required) [roles_responsibilities]
    The documentation for governance and roles and responsibilities may be in one place.

    https://github.com/amahbadi/dlus/blob/main/GOVERNANCE.md#-roles - the roles (maintainer, successor, reviewer, contributor), who has each one (maintainer: @amahbadi; successor: named in GitHub's account successor settings), what each can do, and the maintainer's tasks (merging, releases, security responses within the SECURITY.md times, reviews, documentation, Code of Conduct).


    Enough for a badge!

    The project MUST be able to continue with minimal interruption if any one person dies, is incapacitated, or is otherwise unable or unwilling to continue support of the project. In particular, the project MUST be able to create and close issues, accept proposed changes, and release versions of software, within a week of confirmation of the loss of support from any one individual. This MAY be done by ensuring someone else has any necessary keys, passwords, and legal rights to continue the project. Individuals who run a FLOSS project MAY do this by providing keys in a lockbox and a will providing any needed legal rights (e.g., for DNS names). (URL required) [access_continuity]

    https://github.com/amahbadi/dlus/blob/main/GOVERNANCE.md#-continuity - a GitHub account successor is named; on confirmation that the maintainer cannot continue, GitHub transfers the repository to them, so they can create and close issues, accept pull requests and release. Releases need no personal keys or passwords: they are built, signed (Sigstore) and published by GitHub Actions from a tag. The code is MIT-licensed and everything needed (build, tests, pipeline, docs) is in the repository; the project has no domain names or other accounts.


    Enough for a badge!

    The project SHOULD have a "bus factor" of 2 or more. (URL required) [bus_factor]
    A "bus factor" (aka "truck factor") is the minimum number of project members that have to suddenly disappear from a project ("hit by a bus") before the project stalls due to lack of knowledgeable or competent personnel. The truck-factor tool can estimate this for projects on GitHub. For more information, see Assessing the Bus Factor of Git Repositories by Cosentino et al.

    https://github.com/amahbadi/dlus/blob/main/GOVERNANCE.md#-roles - currently one maintainer (bus factor 1). Mitigations: a named GitHub account successor, releases built and signed by GitHub Actions without personal keys, and full documentation in the repository (https://github.com/amahbadi/dlus/blob/main/GOVERNANCE.md#-continuity). Adding a second maintainer is on the roadmap: https://github.com/amahbadi/dlus/blob/main/docs/ROADMAP.md


  • Documentation


    Enough for a badge!

    The project MUST have a documented roadmap that describes what the project intends to do and not do for at least the next year. (URL required) [documentation_roadmap]
    The project might not achieve the roadmap, and that's fine; the purpose of the roadmap is to help potential users and contributors understand the intended direction of the project. It need not be detailed.

    https://github.com/amahbadi/dlus/blob/main/docs/ROADMAP.md#-the-next-12-months-to-the-end-of-2027 - what the project intends to do and not do over the next 12 months (macOS, Linux, security, project), plus the reasons for what is not planned (Mac App Store, iPad).


    Enough for a badge!

    The project MUST include documentation of the architecture (aka high-level design) of the software produced by the project. If the project does not produce software, select "not applicable" (N/A). (URL required) [documentation_architecture]
    A software architecture explains a program's fundamental structures, i.e., the program's major components, the relationships among them, and the key properties of these components and relationships.

    https://github.com/amahbadi/dlus/blob/main/docs/ARCHITECTURE.md - the high-level design: a component diagram, every major component and what it does, where data is stored and how it is protected, the main flows (download, TV playback, router), and the design rules.


    Enough for a badge!

    The project MUST document what the user can and cannot expect in terms of security from the software produced by the project (its "security requirements"). (URL required) [documentation_security]
    These are the security requirements that the software is intended to meet.

    https://github.com/amahbadi/dlus/blob/main/SECURITY.md - what users can expect (download integrity, a Mac that nobody else can control, approval for every network device, root-helper limits, activity log) and what dlus cannot protect against; the formal security requirements R1-R6 and what is out of scope are in https://github.com/amahbadi/dlus/blob/main/docs/ASSURANCE-CASE.md#-security-requirements


    Enough for a badge!

    The project MUST provide a "quick start" guide for new users to help them quickly do something with the software. (URL required) [documentation_quick_start]
    The idea is to show users how to get started and make the software do anything at all. This is critically important for potential users to get started.

    https://github.com/amahbadi/dlus#-quick-start - a quick-start table (download something, watch it on the Mac or the TV, sync subtitles, control the TV, allow a new device) right after the 3-step install (https://github.com/amahbadi/dlus#-install); full details in https://github.com/amahbadi/dlus/blob/main/docs/USER-GUIDE.md


    Enough for a badge!

    The project MUST make an effort to keep the documentation consistent with the current version of the project results (including software produced by the project). Any known documentation defects making it inconsistent MUST be fixed. If the documentation is generally current, but erroneously includes some older information that is no longer true, just treat that as a defect, then track and fix as usual. [documentation_current]
    The documentation MAY include information about differences or changes between versions of the software and/or link to older versions of the documentation. The intent of this criterion is that an effort is made to keep the documentation consistent, not that the documentation must be perfect.

    Documentation is updated in the same change as the behaviour it describes (required in https://github.com/amahbadi/dlus/blob/main/CONTRIBUTING.md and checked in the pull request template). Each release lists its changes in https://github.com/amahbadi/dlus/blob/main/CHANGELOG.md. Known documentation defects are tracked as issues and fixed like code.


    Enough for a badge!

    The project repository front page and/or website MUST identify and hyperlink to any achievements, including this best practices badge, within 48 hours of public recognition that the achievement has been attained. (URL required) [documentation_achievements]
    An achievement is any set of external criteria that the project has specifically worked to meet, including some badges. This information does not need to be on the project website front page. A project using GitHub can put achievements on the repository front page by adding them to the README file.

    https://github.com/amahbadi/dlus#readme - the repository front page shows and links the OpenSSF Best Practices badge (https://www.bestpractices.dev/projects/16613), the OpenSSF Scorecard rating, and the CI, Security scan and CodeQL results; the badge was added the same day it was earned.


  • Accessibility and internationalization


    Enough for a badge!

    The project (both project sites and project results) SHOULD follow accessibility best practices so that persons with disabilities can still participate in the project and use the project results where it is reasonable to do so. [accessibility_best_practices]
    For web applications, see the Web Content Accessibility Guidelines (WCAG 2.0) and its supporting document Understanding WCAG 2.0; see also W3C accessibility information. For GUI applications, consider using the environment-specific accessibility guidelines (such as Gnome, KDE, XFCE, Android, iOS, Mac, and Windows). Some TUI applications (e.g. `ncurses` programs) can do certain things to make themselves more accessible (such as `alpine`'s `force-arrow-cursor` setting). Most command-line applications are fairly accessible as-is. This criterion is often N/A, e.g., for program libraries. Here are some examples of actions to take or issues to consider:
    • Provide text alternatives for any non-text content so that it can be changed into other forms people need, such as large print, braille, speech, symbols or simpler language ( WCAG 2.0 guideline 1.1)
    • Color is not used as the only visual means of conveying information, indicating an action, prompting a response, or distinguishing a visual element. ( WCAG 2.0 guideline 1.4.1)
    • The visual presentation of text and images of text has a contrast ratio of at least 4.5:1, except for large text, incidental text, and logotypes ( WCAG 2.0 guideline 1.4.3)
    • Make all functionality available from a keyboard (WCAG guideline 2.1)
    • A GUI or web-based project SHOULD test with at least one screen-reader on the target platform(s) (e.g. NVDA, Jaws, or WindowEyes on Windows; VoiceOver on Mac & iOS; Orca on Linux/BSD; TalkBack on Android). TUI programs MAY work to reduce overdraw to prevent redundant reading by screen-readers.

    Partly done: the project site is GitHub (which follows accessibility practices), the docs use real headings, tables and alt text for every image, and the app works fully from the keyboard (shortcuts for every section, command menu, remote control by keyboard), follows macOS zoom and has light and dark modes. The interface has not yet been audited against WCAG 2.2 (screen-reader labels, contrast); that audit is planned.


    Enough for a badge!

    The software produced by the project SHOULD be internationalized to enable easy localization for the target audience's culture, region, or language. If internationalization (i18n) does not apply (e.g., the software doesn't generate text intended for end-users and doesn't sort human-readable text), select "not applicable" (N/A). [internationalization]
    Localization "refers to the adaptation of a product, application or document content to meet the language, cultural and other requirements of a specific target market (a locale)." Internationalization is the "design and development of a product, application or document content that enables easy localization for target audiences that vary in culture, region, or language." (See W3C's "Localization vs. Internationalization".) Software meets this criterion simply by being internationalized. No localization for another specific language is required, since once software has been internationalized it's possible for others to work on localization.

    The interface text is English only and not yet in translatable message catalogs. Content in other languages is fully supported: file names and subtitles in any language (UTF-8), right-to-left Persian and Arabic subtitles with dedicated fonts, and Windows-1256 subtitle files converted automatically. Moving the interface text into a translatable form (starting with Persian) is planned.


  • Other


    Enough for a badge!

    If the project sites (website, repository, and download URLs) store passwords for authentication of external users, the passwords MUST be stored as iterated hashes with a per-user salt by using a key stretching (iterated) algorithm (e.g., Argon2id, Bcrypt, Scrypt, or PBKDF2). If the project sites do not store passwords for this purpose, select "not applicable" (N/A). [sites_password_security]
    Note that the use of GitHub meets this criterion. This criterion only applies to passwords used for authentication of external users into the project sites (aka inbound authentication). If the project sites must log in to other sites (aka outbound authentication), they may need to store authorization tokens for that purpose differently (since storing a hash would be useless). This applies criterion crypto_password_storage to the project sites, similar to sites_https.

    The project sites are GitHub (repository, issues, releases and downloads) and bestpractices.dev. The project runs no website of its own and stores no passwords for anyone; logins are handled by GitHub.


 Change Control 1/1 ●

  • Previous versions


    Enough for a badge!

    The project MUST maintain the most often used older versions of the product or provide an upgrade path to newer versions. If the upgrade path is difficult, the project MUST document how to perform the upgrade (e.g., the interfaces that have changed and detailed suggested steps to help upgrade). [maintenance_or_update]

    Upgrade path: install the new DMG over the old app (documented in the README Install section, https://github.com/amahbadi/dlus#-install). Downloads, settings and TV pairing are kept and older formats are moved forward automatically (e.g. 7.26 moved credentials into secrets.json, and the router helper offers "Update helper" when it changes). Every change is listed in https://github.com/amahbadi/dlus/blob/main/CHANGELOG.md; security fixes go into the latest release.


 Reporting 3/3 ●

  • Bug-reporting process


    Enough for a badge!

    The project MUST use an issue tracker for tracking individual issues. [report_tracker]

    Every bug fixed since the first public release (7.22) has a regression test in the automated suite, run by CI on every change: https://github.com/amahbadi/dlus/blob/main/tests/test_regressions.py (one test per fix, each referencing its release in https://github.com/amahbadi/dlus/blob/main/CHANGELOG.md). The policy requires a test with every fix: https://github.com/amahbadi/dlus/blob/main/CONTRIBUTING.md


  • Vulnerability report process


    Enough for a badge!

    The project MUST give credit to the reporter(s) of all vulnerability reports resolved in the last 12 months, except for the reporter(s) who request anonymity. If there have been no vulnerabilities resolved in the last 12 months, select "not applicable" (N/A). (URL required) [vulnerability_report_credit]

    https://github.com/amahbadi/dlus/blob/main/SECURITY.md#-reporting-a-problem - no vulnerability reports from outside have been resolved in the last 12 months (the security fixes so far came from our own review and scanners, listed in https://github.com/amahbadi/dlus/blob/main/CHANGELOG.md). Policy: reporters are credited by name in the advisory and the changelog unless they ask to stay anonymous.


    Enough for a badge!

    The project MUST have a documented process for responding to vulnerability reports. (URL required) [vulnerability_response_process]
    This is strongly related to vulnerability_report_process, which requires that there be a documented way to report vulnerabilities. It also related to vulnerability_report_response, which requires response to vulnerability reports within a certain time frame.

    https://github.com/amahbadi/dlus/blob/main/SECURITY.md#-reporting-a-problem - documented response process: private report, receipt confirmed within 7 days, reproduction and plan within 14 days, severity rating, fix with a regression test in a private advisory fork, release within 60 days (sooner for critical issues), then a public GitHub security advisory (with a CVE when it applies), a changelog entry and credit for the reporter.


 Quality 19/19 ●

  • Coding standards


    Enough for a badge!

    The project MUST identify the specific coding style guides for the primary languages it uses, and require that contributions generally comply with it. (URL required) [coding_standards]
    In most cases this is done by referring to some existing style guide(s), possibly listing differences. These style guides can include ways to improve readability and ways to reduce the likelihood of defects (including vulnerabilities). Many programming languages have one or more widely-used style guides. Examples of style guides include Google's style guides and SEI CERT Coding Standards.

    https://github.com/amahbadi/dlus/blob/main/CONTRIBUTING.md#-pull-requests - required style guides: Python follows PEP 8 (https://peps.python.org/pep-0008/; Python 3.9+, standard library only, lines up to 160 characters; checked by ruff, https://github.com/amahbadi/dlus/blob/main/pyproject.toml), Swift follows the Swift API Design Guidelines (https://www.swift.org/documentation/api-design-guidelines/), formatted with swift format, and shell scripts must pass ShellCheck at warning level. Plus the security rules: no shell=True, network input always checked. Contributions must comply before they are merged.


    Enough for a badge!

    The project MUST automatically enforce its selected coding style(s) if there is at least one FLOSS tool that can do so in the selected language(s). [coding_standards_enforced]
    This MAY be implemented using static analysis tool(s) and/or by forcing the code through code reformatters. In many cases the tool configuration is included in the project's repository (since different projects may choose different configurations). Projects MAY allow style exceptions (and typically will); where exceptions occur, they MUST be rare and documented in the code at their locations, so that these exceptions can be reviewed and so that tools can automatically handle them in the future. Examples of such tools include ESLint (JavaScript), Rubocop (Ruby), and devtools check (R).

    Enforced automatically on every push and pull request: Python with ruff using the full PEP 8 rule set plus pyflakes (https://github.com/amahbadi/dlus/blob/main/pyproject.toml, in the Security workflow), Swift with "swift format lint --strict" (https://github.com/amahbadi/dlus/blob/main/.swift-format, in CI), and shell scripts with ShellCheck at warning level. Any finding fails the check, so non-compliant code cannot be merged. Locally: make lint.


  • Working build system


    Enough for a badge!

    Build systems for native binaries MUST honor the relevant compiler and linker (environment) variables passed in to them (e.g., CC, CFLAGS, CXX, CXXFLAGS, and LDFLAGS) and pass them to compiler and linker invocations. A build system MAY extend them with additional flags; it MUST NOT simply replace provided values with its own. If no native binaries are being generated, select "not applicable" (N/A). [build_standard_variables]
    It should be easy to enable special build features like Address Sanitizer (ASAN), or to comply with distribution hardening best practices (e.g., by easily turning on compiler flags to do so).

    The only native binary is the Swift window. The build script honours SWIFTC (compiler), SWIFTFLAGS (compiler flags) and LDFLAGS (linker flags, passed through -Xlinker); provided values are added to the build's own flags, never replaced: https://github.com/amahbadi/dlus/blob/main/macos/build_dmg.sh. There is no C/C++ code, so CC/CFLAGS/CXX do not apply.


    Enough for a badge!

    The build and installation system SHOULD preserve debugging information if they are requested in the relevant flags (e.g., "install -s" is not used). If there is no build or installation system (e.g., typical JavaScript libraries), select "not applicable" (N/A). [build_preserve_debug]
    E.G., setting CFLAGS (C) or CXXFLAGS (C++) should create the relevant debugging information if those languages are used, and they should not be stripped during installation. Debugging information is needed for support and analysis, and also useful for measuring the presence of hardening features in the compiled binaries.

    Nothing is stripped: the Python code ships as source, the build never runs "strip" or "install -s", and debugging flags passed in SWIFTFLAGS (e.g. -g) are added to the Swift compile and kept in the app (https://github.com/amahbadi/dlus/blob/main/macos/build_dmg.sh).


    Enough for a badge!

    The build system for the software produced by the project MUST NOT recursively build subdirectories if there are cross-dependencies in the subdirectories. If there is no build or installation system (e.g., typical JavaScript libraries), select "not applicable" (N/A). [build_non_recursive]
    The project build system's internal dependency information needs to be accurate, otherwise, changes to the project may not build correctly. Incorrect builds can lead to defects (including vulnerabilities). A common mistake in large build systems is to use a "recursive build" or "recursive make", that is, a hierarchy of subdirectories containing source files, where each subdirectory is independently built. Unless each subdirectory is fully independent, this is a mistake, because the dependency information is incorrect.

    The build is one flat script (https://github.com/amahbadi/dlus/blob/main/macos/build_dmg.sh) that compiles the single Swift file and copies the Python source and resources into the app. There is no recursive make and no subdirectory builds; the Makefile only calls that script and the test commands.


    Enough for a badge!

    The project MUST be able to repeat the process of generating information from source files and get exactly the same bit-for-bit result. If no building occurs (e.g., scripting languages where the source code is used directly instead of being compiled), select "not applicable" (N/A). [build_repeatable]
    GCC and clang users may find the -frandom-seed option useful; in some cases, this can be resolved by forcing some sort order. More suggestions can be found at the reproducible build site.

    dlus.app (Python sources, resources and the compiled Swift window) is bit-for-bit identical when built twice from the same source. CI builds it twice on every push and pull request and compares SHA-256 hashes of every file: https://github.com/amahbadi/dlus/blob/main/macos/check_repeatable.sh (step "Repeatable build" in https://github.com/amahbadi/dlus/blob/main/.github/workflows/ci.yml).


  • Installation system


    Enough for a badge!

    The project MUST provide a way to easily install and uninstall the software produced by the project using a commonly-used convention. [installation_common]
    Examples include using a package manager (at the system or language level), "make install/uninstall" (supporting DESTDIR), a container in a standard format, or a virtual machine image in a standard format. The installation and uninstallation process (e.g., its packaging) MAY be implemented by a third party as long as it is FLOSS.

    Standard macOS convention: install by dragging dlus from the DMG into Applications (https://github.com/amahbadi/dlus#-install). Uninstall: "dlus menu → Stop dlus Completely" (or the "Uninstall dlus.command" in the DMG, which also removes the optional router helper), then drag the app to the Trash; documented in https://github.com/amahbadi/dlus/blob/main/docs/USER-GUIDE.md#️-15-uninstall


    Enough for a badge!

    The installation system for end-users MUST honor standard conventions for selecting the location where built artifacts are written to at installation time. For example, if it installs files on a POSIX system it MUST honor the DESTDIR environment variable. If there is no installation system or no standard convention, select "not applicable" (N/A). [installation_standard_variables]

    There is no installation system writing to configurable locations; the app is a self-contained macOS bundle.


    Enough for a badge!

    The project MUST provide a way for potential developers to quickly install all the project results and support environment necessary to make changes, including the tests and test environment. This MUST be performed with a commonly-used convention. [installation_development_quick]
    This MAY be implemented using a generated container and/or installation script(s). External dependencies would typically be installed by invoking system and/or language package manager(s), per external_dependencies.

    make setup (Homebrew Bundle with the https://github.com/amahbadi/dlus/blob/main/Brewfile), then make test / make run / make dmg: https://github.com/amahbadi/dlus/blob/main/Makefile


  • Externally-maintained components


    Enough for a badge!

    The project MUST list external dependencies in a computer-processable way. (URL required) [external_dependencies]
    Typically this is done using the conventions of package manager and/or build system. Note that this helps implement installation_development_quick.

    https://github.com/amahbadi/dlus/blob/main/Brewfile (Homebrew Bundle format); Python standard library only.


    Enough for a badge!

    Projects MUST monitor or periodically check their external dependencies (including convenience copies) to detect known vulnerabilities, and fix exploitable vulnerabilities or verify them as unexploitable. [dependency_monitoring]
    This can be done using an origin analyzer / dependency checking tool / software composition analysis tool such as OWASP's Dependency-Check, Sonatype's Nexus Auditor, Synopsys' Black Duck Software Composition Analysis, and Bundler-audit (for Ruby). Some package managers include mechanisms to do this. It is acceptable if the components' vulnerability cannot be exploited, but this analysis is difficult and it is sometimes easier to simply update or fix the part.

    Dependabot alerts and updates, OSV via OpenSSF Scorecard, weekly Security workflow.


    Enough for a badge!

    The project MUST either:
    1. make it easy to identify and update reused externally-maintained components; or
    2. use the standard components provided by the system or programming language.
    Then, if a vulnerability is found in a reused component, it will be easy to update that component. [updateable_reused_components]
    A typical way to meet this criterion is to use system and programming language package management systems. Many FLOSS programs are distributed with "convenience libraries" that are local copies of standard libraries (possibly forked). By itself, that's fine. However, if the program *must* use these local (forked) copies, then updating the "standard" libraries as a security update will leave these additional copies still vulnerable. This is especially an issue for cloud-based systems; if the cloud provider updates their "standard" libraries but the program won't use them, then the updates don't actually help. See, e.g., "Chromium: Why it isn't in Fedora yet as a proper package" by Tom Callaway.

    dlus uses system components only: Python standard library, macOS curl, Homebrew ffmpeg (updated with brew upgrade).


    Enough for a badge!

    The project SHOULD avoid using deprecated or obsolete functions and APIs where FLOSS alternatives are available in the set of technology it uses (its "technology stack") and to a supermajority of the users the project supports (so that users have ready access to the alternative). [interfaces_current]

    https://github.com/amahbadi/dlus/blob/main/docs/INTERFACES.md


  • Automated test suite


    Enough for a badge!

    An automated test suite MUST be applied on each check-in to a shared repository for at least one branch. This test suite MUST produce a report on test success or failure. [automated_integration_testing]
    This requirement can be viewed as a subset of test_continuous_integration, but focused on just testing, without requiring continuous integration.

    CI runs the test suite, the pf rule check, the build and the repeatable-build check on every push and pull request: https://github.com/amahbadi/dlus/blob/main/.github/workflows/ci.yml


    Enough for a badge!

    The project MUST add regression tests to an automated test suite for at least 50% of the bugs fixed within the last six months. [regression_tests_added50]

    Since release 7.23 every fix comes with a regression test; several earlier player and subtitle fixes do not have one yet (being added).


    Enough for a badge!

    The project MUST have FLOSS automated test suite(s) that provide at least 80% statement coverage if there is at least one FLOSS tool that can measure this criterion in the selected language. [test_statement_coverage80]
    Many FLOSS tools are available to measure test coverage, including gcov/lcov, Blanket.js, Istanbul, JCov, and covr (R). Note that meeting this criterion is not a guarantee that the test suite is thorough, instead, failing to meet this criterion is a strong indicator of a poor test suite.

    Statement coverage is being raised; measured with coverage.py (make coverage).


  • New functionality testing


    Enough for a badge!

    The project MUST have a formal written policy that as major new functionality is added, tests for the new functionality MUST be added to an automated test suite. [test_policy_mandated]

    https://github.com/amahbadi/dlus/blob/main/CONTRIBUTING.md - new functionality and every fix must come with tests; pull requests without them are not merged.


    Enough for a badge!

    The project MUST include, in its documented instructions for change proposals, the policy that tests are to be added for major new functionality. [tests_documented_added]
    However, even an informal rule is acceptable as long as the tests are being added in practice.

    Test policy in https://github.com/amahbadi/dlus/blob/main/CONTRIBUTING.md and the pull request template checklist.


  • Warning flags


    Enough for a badge!

    Projects MUST be maximally strict with warnings in the software produced by the project, where practical. [warnings_strict]
    Some warnings cannot be effectively enabled on some projects. What is needed is evidence that the project is striving to enable warning flags where it can, so that errors are detected early.

    ShellCheck (warning level), ruff, Bandit (medium+), Semgrep errors and CodeQL security-extended fail the build.


 Security 13/13 ●

  • Secure development knowledge


    Enough for a badge!

    The project MUST implement secure design principles (from "know_secure_design"), where applicable. If the project is not producing software, select "not applicable" (N/A). [implement_secure_design]
    For example, the project results should have fail-safe defaults (access decisions should deny by default, and projects' installation should be secure by default). They should also have complete mediation (every access that might be limited must be checked for authority and be non-bypassable). Note that in some cases principles will conflict, in which case a choice must be made (e.g., many mechanisms can make things more complex, contravening "economy of mechanism" / keep it simple).

    https://github.com/amahbadi/dlus/blob/main/docs/ASSURANCE-CASE.md#-secure-design-principles-applied


  • Use basic good cryptographic practices

    Note that some software does not need to use cryptographic mechanisms. If your project produces software that (1) includes, activates, or enables encryption functionality, and (2) might be released from the United States (US) to outside the US or to a non-US-citizen, you may be legally required to take a few extra steps. Typically this just involves sending an email. For more information, see the encryption section of Understanding Open Source Technology & US Export Controls.

    Enough for a badge!

    The default security mechanisms within the software produced by the project MUST NOT depend on cryptographic algorithms or modes with known serious weaknesses (e.g., the SHA-1 cryptographic hash algorithm or the CBC mode in SSH). [crypto_weaknesses]
    Concerns about CBC mode in SSH are discussed in CERT: SSH CBC vulnerability.

    No weak algorithms by default: SHA-256 checksums, TLS 1.2+ via OpenSSL/curl; MD5/SHA-1 only to compare a checksum the user supplies.


    Enough for a badge!

    The project SHOULD support multiple cryptographic algorithms, so users can quickly switch if one is broken. Common symmetric key algorithms include AES, Twofish, and Serpent. Common cryptographic hash algorithm alternatives include SHA-2 (including SHA-224, SHA-256, SHA-384 AND SHA-512) and SHA-3. [crypto_algorithm_agility]

    Checksums support SHA-256, SHA-384, SHA-512, SHA-1 and MD5; TLS versions and ciphers are negotiated by OpenSSL/curl.


    Enough for a badge!

    The project MUST support storing authentication credentials (such as passwords and dynamic tokens) and private cryptographic keys in files that are separate from other information (such as configuration files, databases, and logs), and permit users to update and replace them without code recompilation. If the project never processes authentication credentials and private cryptographic keys, select "not applicable" (N/A). [crypto_credential_agility]

    Credentials are stored separately from configuration in ~/.dlus/secrets.json, ui-key and media-key (mode 600) and can be replaced without recompiling (New code / New password in the app).


    Enough for a badge!

    The software produced by the project SHOULD support secure protocols for all of its network communications, such as SSHv2 or later, TLS1.2 or later (HTTPS), IPsec, SFTP, and SNMPv3. Insecure protocols such as FTP, HTTP, telnet, SSLv3 or earlier, and SSHv1 SHOULD be disabled by default, and only enabled if the user specifically configures it. If the software produced by the project does not support network communications, select "not applicable" (N/A). [crypto_used_network]

    Every insecure protocol is off by default and only used when the user turns it on: home-network sharing, DLNA and the proxy (plain HTTP, because TV browsers and DLNA players cannot do local HTTPS) start disabled and every device must also be approved; the unencrypted LG remote-control port (only for TVs before ~2018) is a separate setting, off by default. The TV channel otherwise uses TLS 1.2+ with a pinned certificate and never downgrades; https download links never downgrade to http, and dlus's own internet requests (subtitles, fonts, checksums) use HTTPS. http/ftp downloads happen only when the user pastes such a link. https://github.com/amahbadi/dlus/blob/main/SECURITY.md


    Enough for a badge!

    The software produced by the project SHOULD, if it supports or uses TLS, support at least TLS version 1.2. Note that the predecessor of TLS was called SSL. If the software does not use TLS, select "not applicable" (N/A). [crypto_tls12]

    All TLS in dlus supports and requires TLS 1.2 or newer: the LG TV connection sets ssl.TLSVersion.TLSv1_2 as the minimum (checked by a test, https://github.com/amahbadi/dlus/blob/main/tests/test_regressions.py), and HTTPS downloads and dlus's own requests use macOS curl and Python's default TLS context, which support TLS 1.2 and 1.3 and refuse SSL and TLS 1.0/1.1.


    Enough for a badge!

    The software produced by the project MUST, if it supports TLS, perform TLS certificate verification by default when using TLS, including on subresources. If the software does not use TLS, select "not applicable" (N/A). [crypto_certificate_verification]
    Note that incorrect TLS certificate verification is a common mistake. For more information, see "The Most Dangerous Code in the World: Validating SSL Certificates in Non-Browser Software" by Martin Georgiev et al. and "Do you trust this application?" by Michael Catanzaro.

    All internet TLS uses system certificate verification (curl, Python default context). The single exception is the LG TV's self-signed local certificate, which is pinned at pairing and refused if it changes, with no fallback to plain text.


    Enough for a badge!

    The software produced by the project MUST, if it supports TLS, perform certificate verification before sending HTTP headers with private information (such as secure cookies). If the software does not use TLS, select "not applicable" (N/A). [crypto_verification_private]

    The TV pairing key is only sent after the pinned certificate is verified; on first pairing no secret is sent (the TV issues the key).


  • Secure release


    Enough for a badge!

    The project MUST cryptographically sign releases of the project results intended for widespread use, and there MUST be a documented process explaining to users how they can obtain the public signing keys and verify the signature(s). The private key for these signature(s) MUST NOT be on site(s) used to directly distribute the software to the public. If releases are not intended for widespread use, select "not applicable" (N/A). [signed_releases]
    The project results include both source code and any generated deliverables where applicable (e.g., executables, packages, and containers). Generated deliverables MAY be signed separately from source code. These MAY be implemented as signed git tags (using cryptographic digital signatures). Projects MAY provide generated results separately from tools like git, but in those cases, the separate results MUST be separately signed.

    Every release has a Sigstore bundle and SLSA provenance next to the DMG; verify with gh attestation verify: https://github.com/amahbadi/dlus/releases


    Barely enough for a badge.

    It is SUGGESTED that in the version control system, each important version tag (a tag that is part of a major release, minor release, or fixes publicly noted vulnerabilities) be cryptographically signed and verifiable as described in signed_releases. [version_tags_signed]

    Release tags are annotated and protected by a tag ruleset, but not cryptographically signed; releases themselves are signed.


  • Other security issues


    Enough for a badge!

    The project results MUST check all inputs from potentially untrusted sources to ensure they are valid (an *allowlist*), and reject invalid inputs, if there are any restrictions on the data at all. [input_validation]
    Note that comparing input against a list of "bad formats" (aka a *denylist*) is normally not enough, because attackers can often work around a denylist. In particular, numbers are converted into internal formats and then checked if they are between their minimum and maximum (inclusive), and text strings are checked to ensure that they are valid text patterns (e.g., valid UTF-8, length, syntax, etc.). Some data may need to be "anything at all" (e.g., a file uploader), but these would typically be rare.

    Inputs from the network, servers and files are checked against allow-lists (regexes, safe_join, approved devices, private addresses, fixed helper commands): https://github.com/amahbadi/dlus/blob/main/docs/ASSURANCE-CASE.md


    Enough for a badge!

    Hardening mechanisms SHOULD be used in the software produced by the project so that software defects are less likely to result in security vulnerabilities. [hardening]
    Hardening mechanisms may include HTTP headers like Content Security Policy (CSP), compiler flags to mitigate attacks (such as -fstack-protector), or compiler flags to eliminate undefined behavior. For our purposes least privilege is not considered a hardening mechanism (least privilege is important, but separate).

    https://github.com/amahbadi/dlus/blob/main/docs/ASSURANCE-CASE.md#-secure-design-principles-applied - the app is signed with the macOS hardened runtime; downloads carry the quarantine flag so Gatekeeper still checks them; the local UI sends X-Frame-Options, CSP frame-ancestors, nosniff and no-referrer and accepts only the 127.0.0.1 host with a key cookie (SameSite=Strict); least privilege (one small root helper with a fixed command set, sudo for that file only); files in ~/.dlus mode 700, secrets 600; every network file access goes through one checked path function; TLS 1.2 minimum and a pinned TV certificate; external programs only with argument lists, never a shell.


    Enough for a badge!

    The project MUST provide an assurance case that justifies why its security requirements are met. The assurance case MUST include: a description of the threat model, clear identification of trust boundaries, an argument that secure design principles have been applied, and an argument that common implementation security weaknesses have been countered. (URL required) [assurance_case]
    An assurance case is "a documented body of evidence that provides a convincing and valid argument that a specified set of critical claims regarding a system’s properties are adequately justified for a given application in a given environment" ("Software Assurance Using Structured Assurance Case Models", Thomas Rhodes et al, NIST Interagency Report 7608). Trust boundaries are boundaries where data or execution changes its level of trust, e.g., a server's boundaries in a typical web application. It's common to list secure design principles (such as Saltzer and Schroeer) and common implementation security weaknesses (such as the OWASP top 10 or CWE/SANS top 25), and show how each are countered. The BadgeApp assurance case may be a useful example. This is related to documentation_security, documentation_architecture, and implement_secure_design.

    https://github.com/amahbadi/dlus/blob/main/docs/ASSURANCE-CASE.md - threat model, trust boundaries, secure design principles, common weaknesses countered.


 Analysis 2/2 ●

  • Static code analysis


    Enough for a badge!

    The project MUST use at least one static analysis tool with rules or approaches to look for common vulnerabilities in the analyzed language or environment, if there is at least one FLOSS tool that can implement this criterion in the selected language. [static_analysis_common_vulnerabilities]
    Static analysis tools that are specifically designed to look for common vulnerabilities are more likely to find them. That said, using any static tools will typically help find some problems, so we are suggesting but not requiring this for the 'passing' level badge.

    CodeQL security-extended, Bandit and Semgrep on every change.


  • Dynamic code analysis


    Enough for a badge!

    If the software produced by the project includes software written using a memory-unsafe language (e.g., C or C++), then at least one dynamic tool (e.g., a fuzzer or web application scanner) MUST be routinely used in combination with a mechanism to detect memory safety problems such as buffer overwrites. If the project does not produce software written in a memory-unsafe language, choose "not applicable" (N/A). [dynamic_analysis_unsafe]
    Examples of mechanisms to detect memory safety problems include Address Sanitizer (ASAN) (available in GCC and LLVM), Memory Sanitizer, and valgrind. Other potentially-used tools include thread sanitizer and undefined behavior sanitizer. Widespread assertions would also work.

    dlus is written in memory-safe languages (Python, Swift).



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Project badge entry owned by: Ali Akbar Mahbadi.
Entry created on 2026-11-12 13:11:15 UTC, last updated on 2026-11-12 22:44:45 UTC. Last achieved passing badge on 2026-11-12 13:31:57 UTC.