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Description

oso is an open source policy engine for authorization that’s embedded in your application. It provides a declarative policy language for expressing authorization logic. You define this logic separately from the rest of your application code, but it executes inside the application and can call directly into it. oso ships as a library with a built-in debugger and REPL.

oso is ideal for building permissions into user-facing applications, but you can check out docs to learn about other applications for oso.

Programming language: Rust
License: Apache License 2.0
Latest version: v0.9.0

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README

Oso

Development GitHub release (latest SemVer) Go version Maven version NPM version PyPI version RubyGems version Crates.io version Slack

What is Oso?

Oso is a batteries-included library for building authorization in your application.

Oso gives you a mental model and an authorization system – a set of APIs built on top of a declarative policy language called Polar, plus a debugger and REPL – to define who can do what in your application. You can express common concepts from “users can see their own data” and role-based access control, to others like multi-tenancy, organizations and teams, hierarchies and relationships.

Oso lets you offload the thinking of how to design authorization and build features fast, while keeping the flexibility to extend and customize as you see fit.

Developers can typically write a working Oso policy in <5 minutes, add Oso to an app in <30 minutes, and use Oso to solve real authorization problems within a few hours. To get started, you add the library to your application, create a new Oso instance and load an Oso policy. You can mix and match any of Oso’s authorization APIs to implement features like roles with custom policies that you write to suit your application.

Check out Use Cases to learn more about how teams are using Oso to build authorization.

Oso currently offers libraries for Node.js, Python, Go, Rust, Ruby, and Java.

Getting started

To get up and running with Oso, check out the Getting Started guides in the Oso documentation.

If you have questions or need help getting started come chat with our engineering team & hundreds of other developers using Oso:

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Development

Core

Oso's Rust core is developed against Rust's latest stable release.

Language libraries

Oso's language libraries can be developed without touching the Rust core, but you will still need the Rust stable toolchain installed in order to build the core.

To build the WebAssembly core for the Node.js library, you will need to have wasm-pack installed and available on your system PATH.

Language requirements

To work on a language library, you will need to meet the following version requirements:

  • Java: 10+
    • Maven: 3.6+
  • Node.js: 12.20.0+
    • Yarn 1.22+
  • Python: 3.6+
  • Ruby: 2.4+
    • Bundler 2.1.4+
  • Rust: 1.46+
  • Go: 1.12+

Contributing

See: CONTRIBUTING.md.

License

See: LICENSE.

Share your story

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*Note that all licence references and agreements mentioned in the oso README section above are relevant to that project's source code only.