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annotate src/libpam/module.rs @ 75:c30811b4afae

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rename pam_ffi submodule to libpam.
author Paul Fisher <paul@pfish.zone>
date Fri, 06 Jun 2025 22:35:08 -0400
parents src/pam_ffi/module.rs@c7c596e6388f
children 351bdc13005e
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1 use std::ffi::CStr;
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2
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3 /// Generates the dynamic library entry points for a [PamModule] implementation.
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4 ///
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5 /// Calling `pam_hooks!(SomeType)` on a type that implements [PamModule] will
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6 /// generate the exported `extern "C"` functions that PAM uses to call into
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7 /// your module.
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8 ///
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9 /// ## Examples:
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10 ///
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11 /// Here is full example of a PAM module that would authenticate and authorize everybody:
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12 ///
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13 /// ```
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14 /// use nonstick::{Flags, OwnedLibPamHandle, PamModule, PamHandleModule, Result as PamResult, pam_hooks};
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15 /// use std::ffi::CStr;
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16 /// # fn main() {}
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17 ///
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18 /// struct MyPamModule;
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19 /// pam_hooks!(MyPamModule);
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20 ///
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21 /// impl<T: PamHandleModule> PamModule<T> for MyPamModule {
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22 /// fn authenticate(handle: &mut T, args: Vec<&CStr>, flags: Flags) -> PamResult<()> {
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23 /// let password = handle.get_authtok(Some("what's your password?"))?;
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24 /// handle.info_msg(fmt!("If you say your password is {password:?}, who am I to disagree?"));
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25 /// }
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26 ///
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27 /// fn account_management(handle: &mut T, args: Vec<&CStr>, flags: Flags) -> PamResult<()> {
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28 /// let username = handle.get_user(None)?;
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29 /// handle.info_msg(fmt!("Hello {username}! I trust you unconditionally."))
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30 /// Ok(())
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31 /// }
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32 /// }
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33 /// ```
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34 #[macro_export]
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35 macro_rules! pam_hooks {
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36 ($ident:ident) => {
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37 mod _pam_hooks_scope {
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38 use std::ffi::{c_char, c_int, CStr};
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39 use $crate::{ErrorCode, Flags, LibPamHandle, PamModule};
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40
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41 #[no_mangle]
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42 extern "C" fn pam_sm_acct_mgmt(
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43 pamh: *mut libc::c_void,
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44 flags: Flags,
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45 argc: c_int,
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46 argv: *const *const c_char,
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47 ) -> c_int {
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48 if let Some(handle) = unsafe { pamh.cast::<LibPamHandle>().as_mut() } {
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49 let args = extract_argv(argc, argv);
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50 ErrorCode::result_to_c(super::$ident::account_management(handle, args, flags))
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51 } else {
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52 ErrorCode::Ignore as c_int
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53 }
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54 }
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55
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56 #[no_mangle]
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57 extern "C" fn pam_sm_authenticate(
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58 pamh: *mut libc::c_void,
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59 flags: Flags,
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60 argc: c_int,
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61 argv: *const *const c_char,
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62 ) -> c_int {
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63 if let Some(handle) = unsafe { pamh.cast::<LibPamHandle>().as_mut() } {
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64 let args = extract_argv(argc, argv);
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65 ErrorCode::result_to_c(super::$ident::authenticate(handle, args, flags))
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66 } else {
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67 ErrorCode::Ignore as c_int
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68 }
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69 }
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71 #[no_mangle]
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72 extern "C" fn pam_sm_chauthtok(
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73 pamh: *mut libc::c_void,
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74 flags: Flags,
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75 argc: c_int,
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76 argv: *const *const c_char,
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77 ) -> c_int {
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78 if let Some(handle) = unsafe { pamh.cast::<LibPamHandle>().as_mut() } {
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79 let args = extract_argv(argc, argv);
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80 ErrorCode::result_to_c(super::$ident::change_authtok(handle, args, flags))
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81 } else {
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82 ErrorCode::Ignore as c_int
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83 }
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84 }
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85
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86 #[no_mangle]
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87 extern "C" fn pam_sm_close_session(
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88 pamh: *mut libc::c_void,
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89 flags: Flags,
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90 argc: c_int,
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91 argv: *const *const c_char,
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92 ) -> c_int {
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93 if let Some(handle) = unsafe { pamh.cast::<LibPamHandle>().as_mut() } {
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94 let args = extract_argv(argc, argv);
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95 ErrorCode::result_to_c(super::$ident::close_session(handle, args, flags))
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96 } else {
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97 ErrorCode::Ignore as c_int
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98 }
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99 }
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100
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101 #[no_mangle]
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102 extern "C" fn pam_sm_open_session(
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103 pamh: *mut libc::c_void,
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104 flags: Flags,
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105 argc: c_int,
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106 argv: *const *const c_char,
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107 ) -> c_int {
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108 let args = extract_argv(argc, argv);
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109 if let Some(handle) = unsafe { pamh.cast::<LibPamHandle>().as_mut() } {
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110 ErrorCode::result_to_c(super::$ident::open_session(handle, args, flags))
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111 } else {
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112 ErrorCode::Ignore as c_int
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113 }
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114 }
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115
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116 #[no_mangle]
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117 extern "C" fn pam_sm_setcred(
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118 pamh: *mut libc::c_void,
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119 flags: Flags,
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120 argc: c_int,
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121 argv: *const *const c_char,
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122 ) -> c_int {
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123 let args = extract_argv(argc, argv);
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124 if let Some(handle) = unsafe { pamh.cast::<LibPamHandle>().as_mut() } {
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125 ErrorCode::result_to_c(super::$ident::set_credentials(handle, args, flags))
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126 } else {
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127 ErrorCode::Ignore as c_int
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128 }
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129 }
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130
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131 /// Turns `argc`/`argv` into a [Vec] of [CStr]s.
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132 ///
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133 /// # Safety
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134 ///
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135 /// We use this only with arguments we get from `libpam`, which we kind of have to trust.
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136 fn extract_argv<'a>(argc: c_int, argv: *const *const c_char) -> Vec<&'a CStr> {
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137 (0..argc)
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138 .map(|o| unsafe { CStr::from_ptr(*argv.offset(o as isize) as *const c_char) })
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139 .collect()
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140 }
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141 }
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142 };
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143 }
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144
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145 #[cfg(test)]
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146 mod tests {
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147 // Compile-time test that the `pam_hooks` macro compiles.
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148 use crate::{PamHandleModule, PamModule};
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149 struct Foo;
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150 impl<T: PamHandleModule> PamModule<T> for Foo {}
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151
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152 pam_hooks!(Foo);
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153 }