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Start on environment variables, and make pointers nicer. This starts work on the PAM environment handling, and in so doing, introduces the CHeapBox and CHeapString structs. These are analogous to Box and CString, but they're located on the C heap rather than being Rust-managed memory. This is because environment variables deal with even more pointers and it turns out we can lose a lot of manual freeing using homemade smart pointers.
author Paul Fisher <paul@pfish.zone>
date Tue, 24 Jun 2025 04:25:25 -0400
parents c9fc7e6257d3
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# 🍳 nonstick

Nonstick lets you use PAM (Pluggable Authentication Modules) from Rust without getting stuck in unsafe code.

## Status

This is currently somewhat incomplete.

It provides fairly robust functionality for developing PAM modules (i.e., backends that PAM calls to authenticate users or do something similar).
[Linux-PAM](https://github.com/linux-pam/linux-pam) is the only _tested_ PAM implementation, but it compiles against OpenPAM.

*If you’re looking for a library to implement a PAM client* (i.e., something that authenticates using PAM), consider the [`pam` crate](https://crates.io/crates/pam) for now.

APIs are likely to break before v0.1.0, but thereafter should stabilize to an eventual 1.0 release.
After v0.1.0, the shape of the API should be mostly formed, and most of what happens will be adding new features.

Goals include:

- Bindings for PAM clients.
- Additional PAM features, like environment variables.
- Way more documentation.

## Credits

This is a direct fork of [Anthony Nowell](http://anowell.com/)’s [`pam-rs`/`pam-bindings` crate](https://crates.io/crates/pam-bindings).
`pam-rs` was in turn inspired by:

- [`rust-pam` by tozny](https://github.com/tozny/rust-pam)
- [`pam_groupmap` by ndenev](https://github.com/ndenev/pam_groupmap)
- [`pam-http` by beatgammit](https://github.com/beatgammit/pam-http)