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annotate src/libpam/module.rs @ 87:05291b601f0a

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Well and truly separate the Linux extensions. This separates the Linux extensions on the libpam side, and disables the two enums on the interface side. Users can still call the Linux extensions from non-Linux PAM impls, but they'll get a conversation error back.
author Paul Fisher <paul@pfish.zone>
date Tue, 10 Jun 2025 04:40:01 -0400
parents 002adfb98c5c
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /// Generates the dynamic library entry points for a PAM module
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2 ///
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3 /// Calling `pam_hooks!(SomeType)` on a type that implements
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4 /// [`PamModule`](crate::PamModule) will generate the exported
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5 /// `extern "C"` functions that PAM uses to call into your module.
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6 ///
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7 /// ## Examples:
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8 ///
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9 /// Here is full example of a PAM module that would authenticate
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10 /// and authorize everybody:
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11 ///
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12 /// ```no_run
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13 /// use nonstick::{
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14 /// pam_hooks, Flags, OwnedLibPamHandle, PamHandleModule, PamModule, Result as PamResult,
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15 /// SimpleConversation,
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16 /// };
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17 /// use std::ffi::CStr;
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18 /// # fn main() {}
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19 ///
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20 /// struct MyPamModule;
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21 /// pam_hooks!(MyPamModule);
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22 ///
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23 /// impl<T: PamHandleModule> PamModule<T> for MyPamModule {
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24 /// fn authenticate(handle: &mut T, args: Vec<&CStr>, flags: Flags) -> PamResult<()> {
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25 /// let password = handle.get_authtok(Some("what's your password?"))?;
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26 /// let response =
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27 /// format!("If you say your password is {password:?}, who am I to disagree?");
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28 /// handle.info_msg(&response);
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29 /// Ok(())
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30 /// }
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31 ///
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32 /// fn account_management(handle: &mut T, args: Vec<&CStr>, flags: Flags) -> PamResult<()> {
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33 /// let username = handle.get_user(None)?;
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34 /// let response = format!("Hello {username}! I trust you unconditionally.");
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35 /// handle.info_msg(&response);
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36 /// Ok(())
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37 /// }
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38 /// }
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39 /// ```
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40 #[macro_export]
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41 macro_rules! pam_hooks {
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42 ($ident:ident) => {
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43 mod _pam_hooks_scope {
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44 use std::ffi::{c_char, c_int, CStr};
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45 use $crate::{ErrorCode, Flags, LibPamHandle, PamModule};
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46
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47 #[no_mangle]
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48 extern "C" fn pam_sm_acct_mgmt(
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49 pamh: *mut libc::c_void,
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50 flags: Flags,
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51 argc: c_int,
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52 argv: *const *const c_char,
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53 ) -> c_int {
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54 if let Some(handle) = unsafe { pamh.cast::<LibPamHandle>().as_mut() } {
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55 let args = extract_argv(argc, argv);
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56 ErrorCode::result_to_c(super::$ident::account_management(handle, args, flags))
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57 } else {
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58 ErrorCode::Ignore as c_int
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59 }
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60 }
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61
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62 #[no_mangle]
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63 extern "C" fn pam_sm_authenticate(
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64 pamh: *mut libc::c_void,
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65 flags: Flags,
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66 argc: c_int,
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67 argv: *const *const c_char,
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68 ) -> c_int {
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69 if let Some(handle) = unsafe { pamh.cast::<LibPamHandle>().as_mut() } {
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70 let args = extract_argv(argc, argv);
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71 ErrorCode::result_to_c(super::$ident::authenticate(handle, args, flags))
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72 } else {
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73 ErrorCode::Ignore as c_int
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74 }
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75 }
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77 #[no_mangle]
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78 extern "C" fn pam_sm_chauthtok(
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79 pamh: *mut libc::c_void,
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80 flags: Flags,
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81 argc: c_int,
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82 argv: *const *const c_char,
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83 ) -> c_int {
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84 if let Some(handle) = unsafe { pamh.cast::<LibPamHandle>().as_mut() } {
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85 let args = extract_argv(argc, argv);
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86 ErrorCode::result_to_c(super::$ident::change_authtok(handle, args, flags))
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87 } else {
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88 ErrorCode::Ignore as c_int
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89 }
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90 }
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91
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92 #[no_mangle]
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93 extern "C" fn pam_sm_close_session(
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94 pamh: *mut libc::c_void,
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95 flags: Flags,
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96 argc: c_int,
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97 argv: *const *const c_char,
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98 ) -> c_int {
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99 if let Some(handle) = unsafe { pamh.cast::<LibPamHandle>().as_mut() } {
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100 let args = extract_argv(argc, argv);
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101 ErrorCode::result_to_c(super::$ident::close_session(handle, args, flags))
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102 } else {
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103 ErrorCode::Ignore as c_int
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104 }
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105 }
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106
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107 #[no_mangle]
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108 extern "C" fn pam_sm_open_session(
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109 pamh: *mut libc::c_void,
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110 flags: Flags,
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111 argc: c_int,
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112 argv: *const *const c_char,
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113 ) -> c_int {
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114 let args = extract_argv(argc, argv);
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115 if let Some(handle) = unsafe { pamh.cast::<LibPamHandle>().as_mut() } {
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116 ErrorCode::result_to_c(super::$ident::open_session(handle, args, flags))
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117 } else {
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118 ErrorCode::Ignore as c_int
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119 }
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120 }
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121
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122 #[no_mangle]
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123 extern "C" fn pam_sm_setcred(
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124 pamh: *mut libc::c_void,
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125 flags: Flags,
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126 argc: c_int,
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127 argv: *const *const c_char,
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128 ) -> c_int {
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129 let args = extract_argv(argc, argv);
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130 if let Some(handle) = unsafe { pamh.cast::<LibPamHandle>().as_mut() } {
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131 ErrorCode::result_to_c(super::$ident::set_credentials(handle, args, flags))
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132 } else {
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133 ErrorCode::Ignore as c_int
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134 }
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135 }
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136
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137 /// Turns `argc`/`argv` into a [Vec] of [CStr]s.
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138 ///
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139 /// # Safety
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140 ///
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141 /// We use this only with arguments we get from `libpam`, which we kind of have to trust.
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142 fn extract_argv<'a>(argc: c_int, argv: *const *const c_char) -> Vec<&'a CStr> {
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143 (0..argc)
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144 .map(|o| unsafe { CStr::from_ptr(*argv.offset(o as isize) as *const c_char) })
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145 .collect()
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146 }
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147 }
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148 };
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149 }
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150
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151 #[cfg(test)]
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152 mod tests {
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153 // Compile-time test that the `pam_hooks` macro compiles.
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154 use crate::{PamHandleModule, PamModule};
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155 struct Foo;
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156 impl<T: PamHandleModule> PamModule<T> for Foo {}
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157
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158 pam_hooks!(Foo);
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159 }