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Separate libpam-sys-helpers from libpam-sys. This separates the parts of libpam-sys that don't need linking against libpam from the parts that do need to link against libpam.
author Paul Fisher <paul@pfish.zone>
date Thu, 03 Jul 2025 14:28:04 -0400
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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][nonstick]?
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8 ## PAM implementations
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10 This crate detects the PAM implementation you have installed, or guesses based on the OS if that's unavailable.
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11 Supported PAM implementations are defined in the `pam_impl::PamImpl` enum.
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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-helpers` crate](https://crates.io/crates/libpam-sys-helpers).
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16 Each implementation exports all the functionality available in its respective PAM library.
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17 `XSso` exports only what is in the [X/SSO specification][xsso].
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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 Testing is mainly accomplished through the `libpam-sys-test` package in this crate's workspace.
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27 There are some unit tests of glue code and other type checks.
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29 ## Minimum Rust version
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31 This crate supports **Rust 1.75**, the current version in Debian Trixie and Ubuntu 24.04.2 LTS.
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32 There shouldn't be much that needs changing, since PAM's API is quite stable.
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34 ## References
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36 - [X/SSO PAM specification][xsso]: This 1997 document laid out the original specification for PAM.
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37 - [Linux-PAM repository][linux-pam]: The Linux-PAM implementation, used by most (all?) Linux distributions. Contains many extensions.
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38 - [Linux-PAM man page][man7]: Root man page for Linux-PAM, with links to additional PAM man pages.
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39 - [Linux-PAM guides][linux-guides]: Documentation for developers using PAM and sysadmins.
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40 - [OpenPAM repository][openpam]: The OpenPAM implementation, used by many BSD varieties. This hews very close to the spec.
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41 - [OpenPAM man page][manbsd]: NetBSD's root man page for OpenPAM.
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42 - [Illumos PAM repository][illumos-pam]: Illumos's implementation of PAM, based on Sun's Solaris. Even more basic than OpenPAM.
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43 - [Illumos PAM man page][manillumos]: Illumos's root man page for its PAM implementation.
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45 [ctest]: https://github.com/rust-lang/libc/tree/ctest-v0.4.11/ctest
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46 [nonstick]: https://crates.io/crates/nonstick
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47 [xsso]: https://pubs.opengroup.org/onlinepubs/8329799/toc.htm
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48 [linux-pam]: https://github.com/linux-pam/linux-pam
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49 [man7]: https://www.man7.org/linux/man-pages/man8/pam.8.html
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50 [linux-guides]: https://www.chiark.greenend.org.uk/doc/libpam-doc/html/
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51 [openpam]: https://git.des.dev/OpenPAM/OpenPAM
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52 [manbsd]: https://man.netbsd.org/pam.8
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53 [illumos-pam]: https://code.illumos.org/plugins/gitiles/illumos-gate/+/refs/heads/master/usr/src/lib/libpam/
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54 [manillumos]: https://illumos.org/man/3PAM/pam