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polkit

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What polkit is

polkit is a free, open-source authorization toolkit for Linux and API use. It lets privileged programs decide whether to handle requests from processes without elevated privileges. Its system authority runs through the polkitd daemon, which communicates over the system message bus. A user can receive temporary authorization by authenticating as themselves or as an administrator. For developers, the project documents D-Bus, library, and authentication-agent interfaces. Its libraries support application integration, including C/C++ and languages with GObject Introspection such as JavaScript and Python. The agent library connects with native authentication systems such as PAM. Administrators can write authorization rules in JavaScript, and included tools can check permissions, list registered actions, run commands as another user, and prompt for text-based authentication. The project also documents building from source with Meson, Ninja, and GCC, and verifying release tarballs with GPG signatures. Non-security bugs can be reported through GitHub issues or the polkit-devel mailing list; security issues have separate reporting channels.

Who it suits

polkit suits Linux developers building privileged services and administrators who need to manage authorization rules. Its documented interfaces and tools also serve teams integrating authentication into specialized environments.

What it does well

  • Free and open source.
  • Supports temporary authorization through user or administrator authentication.
  • Offers D-Bus, library, and authentication-agent interfaces.
  • Includes tools for checking authorizations and registered actions.
  • Documents GPG verification for release tarballs.

What to know first

  • Platforms listed are Linux and API only.
  • Authorization rules require JavaScript.

Getting started

  1. Visit https://polkit.org/.
  2. Review the release tarball and source build documentation.
  3. Build from source using the documented Meson, Ninja and GCC tools.
  4. Integrate through the documented D-Bus interface or library APIs.

Verdict

polkit provides Linux programs with a defined way to check authorization and handle requests from less-privileged processes. Its interfaces, libraries, and command-line tools make it relevant to both application integration and system administration.

Questions

Is polkit free?

Yes. polkit is free and open source.

Which platforms does polkit support?

The listed platforms are API and Linux.

What developer interfaces are documented?

The documentation covers D-Bus interfaces, a library API and an authentication agent API.

Which languages can use libpolkit-gobject-1?

It supports C and C++, as well as higher-level languages with GObject Introspection, including JavaScript and Python.

How does polkit handle authentication?

Users can obtain temporary authorization by authenticating as themselves or as an administrative user. Its agent library provides an abstraction for native authentication systems such as PAM.

Where can users get support?

The project directs non-security bug reports to GitHub issues or the polkit-devel mailing list. Previously unknown security issues can be reported to [email protected] or through GitHub's vulnerability reporting button.

Facts from polkit's own pages

Application integration
The libpolkit-gobject-1 library wraps the polkit D-Bus API and can be used from C/C++ and higher-level languages that support GObject Introspection, including JavaScript and Python. · polkit.pages.freedesktop.org, 5 Oct 2026
Architecture
The polkit authority runs as a system daemon, and mechanisms, subjects, and authentication agents communicate with it over the system message bus. · polkit.pages.freedesktop.org, 9 Oct 2026
Authentication
Users can obtain temporary authorization by authenticating as themselves or as an administrative user. · polkit.pages.freedesktop.org, 5 Oct 2026
Authentication agents
The libpolkit-agent-1 library provides an abstraction of the native authentication system and facilities for communicating with the polkit D-Bus service. · polkit.pages.freedesktop.org, 9 Oct 2026
Authentication integration
The libpolkit-agent-1 library provides an abstraction of the native authentication system, such as PAM, and facilities for communicating with the polkit D-Bus service. · polkit.pages.freedesktop.org, 5 Oct 2026
Authorization model
It centralizes authorization decisions for access to privileged operations requested by unprivileged applications. · wiki.freedesktop.org, 9 Oct 2026
Authorization tools
The project includes tools to check authorizations, list registered actions, execute commands as another user, and provide textual authentication. · polkit.pages.freedesktop.org, 5 Oct 2026
Bug reports and support
The project directs non-security bug reports to GitHub Issues or the polkit-devel mailing list. · github.com, 9 Oct 2026
Command line
Authorization checks can use the D-Bus API or the pkcheck command, and pkexec can execute a command as another user. · polkit.pages.freedesktop.org, 9 Oct 2026
Developer interfaces
The documentation lists D-Bus interfaces, a library API, and an authentication agent API. · polkit.pages.freedesktop.org, 5 Oct 2026
Downloads and build
The project links to release tarballs and documents building from source with Meson, Ninja, and GCC. · github.com, 5 Oct 2026
Intended rule authors
Authorization rules are intended for system administrators and special-purpose operating systems or environments. · polkit.pages.freedesktop.org, 9 Oct 2026
Libraries
The libpolkit-gobject-1 library wraps the D-Bus API and supports C, C++, JavaScript, and Python through GObject Introspection. · polkit.pages.freedesktop.org, 9 Oct 2026
Policy rules
System administrators and special-purpose operating systems or environments can control authorization policy with JavaScript rule files. · polkit.pages.freedesktop.org, 9 Oct 2026
Policy service
The polkit authority is implemented as the polkitd system daemon, which runs as the polkitd system user and communicates over the system message bus. · polkit.pages.freedesktop.org, 5 Oct 2026
Purpose
polkit is a toolkit for defining and handling authorizations that lets unprivileged processes communicate with privileged processes. · github.com, 9 Oct 2026
Release downloads
The project provides releases and older release tarballs, and documents GPG signature verification for compressed tarballs. · github.com, 9 Oct 2026
Release verification
The project documents verifying release tarballs with GPG signatures and publishes a public key fingerprint. · github.com, 5 Oct 2026
Security reporting
The project asks that undisclosed security issues be reported to [email protected] or through GitHub's vulnerability reporting flow. · github.com, 9 Oct 2026
Support
The project directs non-security bug reports to GitHub issues or the polkit-devel mailing list. · github.com, 5 Oct 2026
Temporary authorization
Users can obtain temporary authorization by authenticating as an administrator or as the owner of the relevant session. · polkit.pages.freedesktop.org, 9 Oct 2026

Where polkit stands on Freedom251

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