# libpam-sys

This crate provides low-level access to PAM.

## Options

With no features at all enabled, only the functions specified by the [X/SSO PAM specification][xsso] are available.

- `extras` (enabled by default): Common extensions to PAM, shared by both OpenPAM and Linux-PAM.
  This includes, most notably, `pam_get_authtok`.
  *Illumos does not provide this.*
- `illumos-ext`: Extensions provided only by Illumos.
- `linux-pam-ext`: Extensions provided only by Linux-PAM.
- `openpam-ext`: Extensions provided by OpenPAM.
- `use-system-headers`: Source constants from your PAM system headers.

## References

- [X/SSO PAM specification][xsso]: This 1997 document laid out the original specification for PAM.
- [Linux-PAM repository][linux-pam]: The Linux-PAM implementation, used by most (all?) Linux distributions. Contains many extensions.
  - [Linux-PAM man page][man7]: Root man page for Linux-PAM, with links to additional PAM man pages.
  - [Linux-PAM guides][linux-guides]: Documentation for developers using PAM and sysadmins.
- [OpenPAM repository][openpam]: The OpenPAM implementation, used by many BSD varieties. This hews very close to the spec.
  - [OpenPAM man page][manbsd]: NetBSD's root man page for OpenPAM.
- [Illumos PAM repository][illumos-pam]: Illumos's implementation of PAM. Even more basic than OpenPAM.
  - [Illumos PAM man page][manillumos]: Illumos's root man page for its PAM implementation.

[xsso]: https://pubs.opengroup.org/onlinepubs/8329799/toc.htm
[linux-pam]: https://github.com/linux-pam/linux-pam
[man7]: https://www.man7.org/linux/man-pages/man8/pam.8.html
[linux-guides]: https://www.chiark.greenend.org.uk/doc/libpam-doc/html/
[openpam]: https://git.des.dev/OpenPAM/OpenPAM
[manbsd]: https://man.netbsd.org/pam.8
[illumos-pam]: https://code.illumos.org/plugins/gitiles/illumos-gate/+/refs/heads/master/usr/src/lib/libpam/
[manillumos]: https://illumos.org/man/3PAM/pam