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annotate src/libpam/module.rs @ 77:351bdc13005e

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Update the libpam module to work with the new structure.
author Paul Fisher <paul@pfish.zone>
date Sun, 08 Jun 2025 01:03:46 -0400
parents c30811b4afae
children 002adfb98c5c
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1 /// Generates the dynamic library entry points for a [PamModule] implementation.
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2 ///
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3 /// Calling `pam_hooks!(SomeType)` on a type that implements [PamModule] will
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4 /// generate the exported `extern "C"` functions that PAM uses to call into
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5 /// 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 and authorize everybody:
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10 ///
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11 /// ```no_run
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12 /// use nonstick::{Flags, SimpleConversation, OwnedLibPamHandle, PamModule, PamHandleModule, Result as PamResult, pam_hooks};
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13 /// use std::ffi::CStr;
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14 /// # fn main() {}
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15 ///
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16 /// struct MyPamModule;
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17 /// pam_hooks!(MyPamModule);
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18 ///
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19 /// impl<T: PamHandleModule> PamModule<T> for MyPamModule {
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20 /// fn authenticate(handle: &mut T, args: Vec<&CStr>, flags: Flags) -> PamResult<()> {
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21 /// let password = handle.get_authtok(Some("what's your password?"))?;
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22 /// let response = format!("If you say your password is {password:?}, who am I to disagree?");
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23 /// handle.info_msg(&response);
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24 /// Ok(())
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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 /// let response = format!("Hello {username}! I trust you unconditionally.");
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30 /// handle.info_msg(&response);
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31 /// Ok(())
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32 /// }
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33 /// }
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34 /// ```
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35 #[macro_export]
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36 macro_rules! pam_hooks {
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37 ($ident:ident) => {
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38 mod _pam_hooks_scope {
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39 use std::ffi::{c_char, c_int, CStr};
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40 use $crate::{ErrorCode, Flags, LibPamHandle, PamModule};
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41
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42 #[no_mangle]
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43 extern "C" fn pam_sm_acct_mgmt(
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44 pamh: *mut libc::c_void,
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45 flags: Flags,
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46 argc: c_int,
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47 argv: *const *const c_char,
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48 ) -> c_int {
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49 if let Some(handle) = unsafe { pamh.cast::<LibPamHandle>().as_mut() } {
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50 let args = extract_argv(argc, argv);
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51 ErrorCode::result_to_c(super::$ident::account_management(handle, args, flags))
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52 } else {
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53 ErrorCode::Ignore as c_int
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54 }
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55 }
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56
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57 #[no_mangle]
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58 extern "C" fn pam_sm_authenticate(
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59 pamh: *mut libc::c_void,
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60 flags: Flags,
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61 argc: c_int,
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62 argv: *const *const c_char,
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63 ) -> c_int {
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64 if let Some(handle) = unsafe { pamh.cast::<LibPamHandle>().as_mut() } {
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65 let args = extract_argv(argc, argv);
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66 ErrorCode::result_to_c(super::$ident::authenticate(handle, args, flags))
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67 } else {
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68 ErrorCode::Ignore as c_int
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69 }
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70 }
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72 #[no_mangle]
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73 extern "C" fn pam_sm_chauthtok(
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74 pamh: *mut libc::c_void,
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75 flags: Flags,
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76 argc: c_int,
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77 argv: *const *const c_char,
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78 ) -> c_int {
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79 if let Some(handle) = unsafe { pamh.cast::<LibPamHandle>().as_mut() } {
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80 let args = extract_argv(argc, argv);
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81 ErrorCode::result_to_c(super::$ident::change_authtok(handle, args, flags))
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82 } else {
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83 ErrorCode::Ignore as c_int
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84 }
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85 }
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86
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87 #[no_mangle]
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88 extern "C" fn pam_sm_close_session(
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89 pamh: *mut libc::c_void,
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90 flags: Flags,
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91 argc: c_int,
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92 argv: *const *const c_char,
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93 ) -> c_int {
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94 if let Some(handle) = unsafe { pamh.cast::<LibPamHandle>().as_mut() } {
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95 let args = extract_argv(argc, argv);
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96 ErrorCode::result_to_c(super::$ident::close_session(handle, args, flags))
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97 } else {
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98 ErrorCode::Ignore as c_int
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99 }
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100 }
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101
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102 #[no_mangle]
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103 extern "C" fn pam_sm_open_session(
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104 pamh: *mut libc::c_void,
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105 flags: Flags,
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106 argc: c_int,
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107 argv: *const *const c_char,
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108 ) -> c_int {
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109 let args = extract_argv(argc, argv);
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110 if let Some(handle) = unsafe { pamh.cast::<LibPamHandle>().as_mut() } {
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111 ErrorCode::result_to_c(super::$ident::open_session(handle, args, flags))
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112 } else {
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113 ErrorCode::Ignore as c_int
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114 }
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115 }
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116
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117 #[no_mangle]
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118 extern "C" fn pam_sm_setcred(
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119 pamh: *mut libc::c_void,
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120 flags: Flags,
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121 argc: c_int,
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122 argv: *const *const c_char,
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123 ) -> c_int {
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124 let args = extract_argv(argc, argv);
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125 if let Some(handle) = unsafe { pamh.cast::<LibPamHandle>().as_mut() } {
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126 ErrorCode::result_to_c(super::$ident::set_credentials(handle, args, flags))
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127 } else {
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128 ErrorCode::Ignore as c_int
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129 }
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130 }
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131
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132 /// Turns `argc`/`argv` into a [Vec] of [CStr]s.
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133 ///
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134 /// # Safety
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135 ///
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136 /// We use this only with arguments we get from `libpam`, which we kind of have to trust.
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137 fn extract_argv<'a>(argc: c_int, argv: *const *const c_char) -> Vec<&'a CStr> {
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138 (0..argc)
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139 .map(|o| unsafe { CStr::from_ptr(*argv.offset(o as isize) as *const c_char) })
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140 .collect()
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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
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146 #[cfg(test)]
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147 mod tests {
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148 // Compile-time test that the `pam_hooks` macro compiles.
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149 use crate::{PamHandleModule, PamModule};
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150 struct Foo;
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151 impl<T: PamHandleModule> PamModule<T> for Foo {}
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152
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153 pam_hooks!(Foo);
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154 }