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annotate libpam-sys/libpam-sys-impls/src/lib.rs @ 190:995aca290452

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Restructure the way libpam-sys-impls works to fix cross-compilation. The previous structure of libpam-sys-impls meant that things got confusing (including for me) between what constants were build-time and what constants were run-time. This broke cross-compilation. This simplifies the way that works so that `libpam-sys-impls` has *no* build script itself and is intended mostly as a library to be included in other libraries' build scripts (while also exporting the PamImpl enum).
author Paul Fisher <paul@pfish.zone>
date Sat, 02 Aug 2025 18:47:46 -0400
parents 0730f5f2ee2a
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #![allow(clippy::needless_doctest_main)]
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2 //! An enumeration of PAM implementations and tools to detect them.
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3 //!
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4 //! # Configuration
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5 //!
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6 //! When used at compile time, this crate uses the target OS by default,
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7 //! but can be overridden with the `LIBPAMSYS_IMPL` environment variable.
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8 //! See the documentation of [`build_target_impl`] for details.
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9 //!
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10 //! # Detecting PAM
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11 //!
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12 //! ## Build time
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13 //!
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14 //! Use [`enable_pam_impl_cfg`] in your `build.rs` to generate custom `#[cfg]`s
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15 //! for conditional compilation based on PAM implementation.
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16 //!
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17 //! To detect the implementation that will be used at runtime, use the
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18 //! [`build_target_impl`] function.
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19 //!
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20 //! ## Run time
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21 //!
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22 //! The implementation of PAM installed on the machine where the code is running
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23 //! can be detected with [`currently_installed`], or you can use
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24 //! [`os_default`] to see what implementation is used on a given target.
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25
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26 use std::env;
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27 use std::env::VarError;
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28 use std::ffi::c_void;
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29 use std::ptr::NonNull;
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30
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31 /// An enum that knows its own values.
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32 macro_rules! self_aware_enum {
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33 (
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34 $(#[$enumeta:meta])*
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35 $viz:vis enum $name:ident {
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36 $(
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37 $(#[$itemeta:meta])*
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38 $item:ident,
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39 )*
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40 }
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41 ) => {
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42 $(#[$enumeta])*
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43 $viz enum $name {
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44 $(
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45 $(#[$itemeta])*
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46 $item,
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47 )*
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48 }
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49
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50 // The implementations in this block are private for now
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51 // to avoid putting a contract into the public API.
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52 #[allow(dead_code)]
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53 impl $name {
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54 /// Iterator over the items in the enum. For internal use.
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55 pub(crate) fn items() -> Vec<Self> {
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56 vec![$(Self::$item),*]
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57 }
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58
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59 /// Attempts to parse the enum from the string. For internal use.
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60 pub(crate) fn try_from(value: &str) -> Result<Self, String> {
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61 match value {
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62 $(stringify!($item) => Ok(Self::$item),)*
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63 _ => Err(value.into()),
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64 }
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65 }
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66 }
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67 };
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68 }
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69
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70 self_aware_enum! {
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71 /// The PAM implementations supported by `libpam-sys`.
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72 #[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
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73 #[non_exhaustive]
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74 pub enum PamImpl {
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75 /// [Linux-PAM] is provided by most Linux distributions.
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76 ///
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77 /// [Linux-PAM]: https://github.com/linux-pam/linux-pam
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78 LinuxPam,
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79 /// [OpenPAM] is used by most BSDs, including Mac OS X.
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80 ///
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81 /// [OpenPAM]: https://git.des.dev/OpenPAM/OpenPAM
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82 OpenPam,
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83 /// Illumos and Solaris use a derivative of [Sun's implementation][sun].
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84 ///
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85 /// [sun]: https://code.illumos.org/plugins/gitiles/illumos-gate/+/refs/heads/master/usr/src/lib/libpam
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86 Sun,
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87 /// Only the functionality and constants in [the PAM spec].
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88 ///
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89 /// [the PAM spec]: https://pubs.opengroup.org/onlinepubs/8329799/toc.htm
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90 XSso,
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91 }
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92 }
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93
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94 #[allow(clippy::needless_doctest_main)]
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95 /// Generates `cargo` directives for build scripts to enable `cfg(pam_impl)`.
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96 ///
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97 /// Print this in your `build.rs` script to be able to use the custom `pam_impl`
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98 /// configuration directive.
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99 ///
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100 /// ```
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101 /// // Your package's build.rs:
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102 ///
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103 /// fn main() {
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104 /// // Also available at libpam_sys::pam_impl::enable_pam_impl_cfg().
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105 /// libpam_sys_impls::enable_pam_impl_cfg();
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106 /// // whatever else you do in your build script.
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107 /// }
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108 /// ```
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109 ///
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110 /// This will set the current `pam_impl` as well as registering all known
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111 /// PAM implementations with `rustc-check-cfg` to get cfg-checking.
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112 ///
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113 /// The names that appear in the `cfg` variables are the same as the values
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114 /// in the [`PamImpl`] enum.
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115 ///
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116 /// ```ignore
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117 /// #[cfg(pam_impl = "OpenPam")]
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118 /// fn openpam_specific_func(handle: *const libpam_sys::pam_handle) {
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119 /// let environ = libpam_sys::pam_getenvlist(handle);
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120 /// // ...
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121 /// libpam_sys::openpam_free_envlist()
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122 /// }
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123 ///
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124 /// // This will give you a warning since "UnknownImpl" is not a known
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125 /// // PAM implementation.
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126 /// #[cfg(not(pam_impl = "UnknownImpl"))]
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127 /// fn do_something() {
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128 /// // ...
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129 /// }
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130 /// ```
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131 pub fn enable_pam_impl_cfg() {
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132 println!("{}", pam_impl_cfg_string())
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133 }
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134
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135 /// [`enable_pam_impl_cfg`], but returned as a string.
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136 pub fn pam_impl_cfg_string() -> String {
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137 generate_cfg(build_target_impl())
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138 }
118
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139
190
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140 fn generate_cfg(pam_impl: Option<PamImpl>) -> String {
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141 let impls: Vec<_> = PamImpl::items()
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142 .into_iter()
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143 .map(|i| format!(r#""{i:?}""#))
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144 .collect();
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145 let mut lines = vec![
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146 format!(
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147 "cargo:rustc-check-cfg=cfg(pam_impl, values({impls}))",
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148 impls = impls.join(",")
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149 ),
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150 "cargo:rustc-cfg=pam_impl".into(),
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151 ];
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152 if let Some(pam_impl) = pam_impl {
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153 lines.push("cargo:rustc-cfg=pam_impl".into());
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154 lines.push(format!("cargo:rustc-cfg=pam_impl=\"{pam_impl:?}\""));
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155 }
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156 lines.join("\n")
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157 }
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158
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159 /// The strategy to use to detect PAM.
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160 enum Detect {
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161 /// Use the default PAM implementation based on the target OS.
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162 TargetDefault,
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163 /// Detect the installed implementation.
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164 Installed,
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165 /// Use the named version of PAM.
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166 Specified(PamImpl),
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167 }
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168
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169 const INSTALLED: &str = "__installed__";
118
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170
190
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171 /// For `build.rs` use: Detects the PAM implementation that should be used
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172 /// for the target of the currently-running build script.
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173 ///
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174 /// # Configuration
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175 ///
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176 /// The PAM implementation selected depends upon the value of the
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177 /// `LIBPAMSYS_IMPL` environment variable.
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178 ///
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179 /// - Empty or unset (default): Use the default PAM implementation for the
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180 /// Cargo target OS (as specified by `CARGO_CFG_TARGET_OS`).
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181 /// - Linux: Linux-PAM
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182 /// - BSD (and Mac): OpenPAM
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183 /// - Illumos/Solaris: Sun PAM
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184 /// - `__installed__`: Use the PAM implementation installed on the host system.
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185 /// This opens the `libpam` library and looks for specific functions.
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186 /// - The name of a [PamImpl] member: Use that PAM implementation.
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187 ///
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188 /// # Panics
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189 ///
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190 /// If an unknown PAM implementation is provided in `LIBPAMSYS_IMPL`.
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191 pub fn build_target_impl() -> Option<PamImpl> {
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192 let detection = match env::var("LIBPAMSYS_IMPL").as_deref() {
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193 Ok("") | Err(VarError::NotPresent) => Detect::TargetDefault,
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194 Ok(INSTALLED) => Detect::Installed,
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195 Ok(val) => Detect::Specified(PamImpl::try_from(val).unwrap_or_else(|_| {
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196 panic!(
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197 "unknown PAM implementation {val:?}. \
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198 valid LIBPAMSYS_IMPL values are {:?}, \
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199 {INSTALLED:?} to use the currently-installed version, \
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200 or unset to use the OS default",
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201 PamImpl::items()
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202 )
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203 })),
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204 Err(other) => panic!("Couldn't detect PAM version: {other}"),
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205 };
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206 match detection {
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207 Detect::TargetDefault => env::var("CARGO_CFG_TARGET_OS")
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208 .ok()
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209 .as_deref()
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210 .and_then(os_default),
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211 Detect::Installed => currently_installed(),
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212 Detect::Specified(other) => Some(other),
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213 }
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214 }
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215
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216 /// Gets the PAM version based on the target OS.
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217 ///
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218 /// The target OS name passed in is one of the [Cargo target OS values][os].
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219 ///
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220 /// [os]: https://doc.rust-lang.org/reference/conditional-compilation.html#r-cfg.target_os.values
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221 pub fn os_default(target_os: &str) -> Option<PamImpl> {
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222 match target_os {
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223 "linux" => Some(PamImpl::LinuxPam),
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224 "macos" | "freebsd" | "netbsd" | "dragonfly" | "openbsd" => Some(PamImpl::OpenPam),
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225 "illumos" | "solaris" => Some(PamImpl::Sun),
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226 _ => None,
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227 }
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228 }
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229
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230 /// The version of LibPAM installed on this machine (as found by `dlopen`).
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231 pub fn currently_installed() -> Option<PamImpl> {
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232 LibPam::open().map(|lib| {
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233 if lib.has(b"pam_syslog\0") {
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234 PamImpl::LinuxPam
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235 } else if lib.has(b"_openpam_log\0") {
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236 PamImpl::OpenPam
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237 } else if lib.has(b"__pam_get_authtok\0") {
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238 PamImpl::Sun
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239 } else {
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240 PamImpl::XSso
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241 }
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242 })
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243 }
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244
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245 struct LibPam(NonNull<c_void>);
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246
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247 impl LibPam {
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248 fn open() -> Option<Self> {
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249 let dlopen = |s: &[u8]| unsafe { libc::dlopen(s.as_ptr().cast(), libc::RTLD_LAZY) };
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250 NonNull::new(dlopen(b"libpam.so\0"))
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251 .or_else(|| NonNull::new(dlopen(b"libpam.dylib\0")))
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252 .map(Self)
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253 }
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254
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255 fn has(&self, name: &[u8]) -> bool {
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256 let symbol = unsafe { libc::dlsym(self.0.as_ptr(), name.as_ptr().cast()) };
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257 !symbol.is_null()
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258 }
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259 }
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260
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261 impl Drop for LibPam {
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262 fn drop(&mut self) {
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263 unsafe {
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264 libc::dlclose(self.0.as_ptr());
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265 }
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266 }
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267 }