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annotate libpam-sys/README.md @ 160:09dff285ff5e

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Switch default PAM detection strategy to target-based. To make cross-compilation easier (like for docs.rs), this change makes OS-based detection of PAM the default, only falling back to probing the actual installed PAM as a last resort. I haven't been able to find a Linux distribution that uses anything but Linux-PAM.
author Paul Fisher <paul@pfish.zone>
date Sun, 13 Jul 2025 15:38:00 -0400
parents d5b7b28d754e
children e9354e655f38
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1 # `libpam-sys`: low-level bindings to Pluggable Authentication Modules
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3 This crate provides low-level access to PAM, working with multiple PAM implementations.
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4 You do not need PAM system headers installed to use this!
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6 If you're looking for a nice, safe, Rusty API to PAM, may I recommend [nonstick]?
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8 ## PAM implementations
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10 Supported PAM implementations are defined in the `pam_impl::PamImpl` enum.
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12 This crate automatically chooses the appropriate PAM implementation you are most likely to need installed based on the target OS.
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13 You can also explicitly specify the PAM implementation you want (if not detected correctly) by setting the `LIBPAMSYS_IMPL` environment variable **at build time**.
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14 All build-time configuration is performed by the build script of the [`libpam-sys-consts` crate](https://crates.io/crates/libpam-sys-consts).
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16 Normally, this crate exports all functionality available in the selected PAM library.
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17 `XSso` exports only the subset of the [X/SSO specification][xsso] supported by both OpenPAM and Sun PAM.
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19 ## Testing
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21 Tests are mostly run through `libpam-sys-test`, which lives in the crate's workspace in its repository (along with [nonstick]).
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23 - [`ctest`][ctest] verifies the correctness of the FFI bindings (function/struct alignment, etc.).
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24 - A kind of scuffed homebrew thing also verifies that the constants are correct.
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26 There are some unit tests of glue code and other type checks.
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28 ## Minimum Rust version
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30 This crate supports **Rust 1.75**, the current version in Debian Trixie and Ubuntu 24.04.2 LTS.
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31 There shouldn't be much that needs changing, since PAM's API is quite stable.
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33 ## References
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35 - [X/SSO PAM specification][xsso]: This 1997 document laid out the original specification for PAM.
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36 - [Linux-PAM repository][linux-pam]: The Linux-PAM implementation, used by most (all?) Linux distributions. Contains many extensions.
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37 - [Linux-PAM man page][man7]: Root man page for Linux-PAM, with links to additional PAM man pages.
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38 - [Linux-PAM guides][linux-guides]: Documentation for developers using PAM and sysadmins.
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39 - [OpenPAM repository][openpam]: The OpenPAM implementation, used by many BSD varieties. This hews very close to the spec.
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40 - [OpenPAM man page][manbsd]: NetBSD's root man page for OpenPAM.
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41 - [Illumos PAM repository][illumos-pam]: Illumos's implementation of PAM, based on Sun's Solaris. Even more basic than OpenPAM.
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42 - [Illumos PAM man page][manillumos]: Illumos's root man page for its PAM implementation.
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44 [ctest]: https://github.com/rust-lang/libc/tree/ctest-v0.4.11/ctest
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45 [nonstick]: https://crates.io/crates/nonstick
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46 [xsso]: https://pubs.opengroup.org/onlinepubs/8329799/toc.htm
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47 [linux-pam]: https://github.com/linux-pam/linux-pam
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48 [man7]: https://www.man7.org/linux/man-pages/man8/pam.8.html
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49 [linux-guides]: https://www.chiark.greenend.org.uk/doc/libpam-doc/html/
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50 [openpam]: https://git.des.dev/OpenPAM/OpenPAM
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51 [manbsd]: https://man.netbsd.org/pam.8
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52 [illumos-pam]: https://code.illumos.org/plugins/gitiles/illumos-gate/+/refs/heads/master/usr/src/lib/libpam/
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53 [manillumos]: https://illumos.org/man/3PAM/pam