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annotate pam/src/hooks.rs @ 21:aa7e8bd083ef

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add more docs and other cleanup
author Anthony Nowell <anthony@algorithmia.com>
date Tue, 26 Sep 2017 02:15:28 -0600
parents 734ca62159fb
children
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1 use module::{PamHandle};
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2 use constants::{PamFlag, PamResultCode};
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3 use std::ffi::CStr;
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4
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5 /// Provides functions that are invoked by the entrypoints generated by the
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6 /// [`pam_hooks!` macro](../macro.pam_hooks.html).
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7 ///
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8 /// All of hooks are ignored by PAM dispatch by default given the default return value of `PAM_IGNORE`.
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9 /// Override any functions that you want to handle with your module. See `man pam(3)`.
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10 #[allow(unused_variables)]
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11 pub trait PamHooks {
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12 /// This function performs the task of establishing whether the user is permitted to gain access at
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13 /// this time. It should be understood that the user has previously been validated by an
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14 /// authentication module. This function checks for other things. Such things might be: the time of
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15 /// day or the date, the terminal line, remote hostname, etc. This function may also determine
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16 /// things like the expiration on passwords, and respond that the user change it before continuing.
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17 fn acct_mgmt(pamh: &PamHandle, args: Vec<&CStr>, flags: PamFlag) -> PamResultCode {
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18 PamResultCode::PAM_IGNORE
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19 }
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21 /// This function performs the task of authenticating the user.
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22 fn sm_authenticate(pamh: &PamHandle, args: Vec<&CStr>, flags: PamFlag) -> PamResultCode {
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23 PamResultCode::PAM_IGNORE
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24 }
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25
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26 /// This function is used to (re-)set the authentication token of the user.
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27 ///
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28 /// The PAM library calls this function twice in succession. The first time with
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29 /// PAM_PRELIM_CHECK and then, if the module does not return PAM_TRY_AGAIN, subsequently with
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30 /// PAM_UPDATE_AUTHTOK. It is only on the second call that the authorization token is
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31 /// (possibly) changed.
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32 fn sm_chauthtok(pamh: &PamHandle, args: Vec<&CStr>, flags: PamFlag) -> PamResultCode {
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33 PamResultCode::PAM_IGNORE
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34 }
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35
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36 /// This function is called to terminate a session.
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37 fn sm_close_session(pamh: &PamHandle, args: Vec<&CStr>, flags: PamFlag) -> PamResultCode {
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38 PamResultCode::PAM_IGNORE
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39 }
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40
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41 /// This function is called to commence a session.
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42 fn sm_open_session(pamh: &PamHandle, args: Vec<&CStr>, flags: PamFlag) -> PamResultCode {
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43 PamResultCode::PAM_IGNORE
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44 }
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45
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46 /// This function performs the task of altering the credentials of the user with respect to the
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47 /// corresponding authorization scheme. Generally, an authentication module may have access to more
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48 /// information about a user than their authentication token. This function is used to make such
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49 /// information available to the application. It should only be called after the user has been
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50 /// authenticated but before a session has been established.
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51 fn sm_setcred(pamh: &PamHandle, args: Vec<&CStr>, flags: PamFlag) -> PamResultCode {
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52 PamResultCode::PAM_IGNORE
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53 }
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54 }
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55
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56 /// Macro to generate the `extern "C"` entrypoint bindings needed by PAM
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57 ///
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58 /// You can call `pam_hooks!(SomeType);` for any type that implements `PamHooks`
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59 ///
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60 /// ## Examples:
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61 ///
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62 /// Here is full example of a PAM module that would authenticate and authorize everybody:
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63 ///
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64 /// ```
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65 /// #[macro_use] extern crate pam;
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66 ///
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67 /// use pam::hooks::PamHooks;
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68 /// use pam::module::PamHandle;
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69 /// use pam::constants::{PamResultCode, PamFlag};
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70 /// use std::ffi::CStr;
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71 ///
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72 /// # fn main() {}
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73 /// struct MyPamModule;
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74 /// pam_hooks!(MyPamModule);
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75 ///
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76 /// impl PamHooks for MyPamModule {
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77 /// fn sm_authenticate(pamh: &PamHandle, args: Vec<&CStr>, flags: PamFlag) -> PamResultCode {
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78 /// println!("Everybody is authenticated!");
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79 /// PamResultCode::PAM_SUCCESS
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80 /// }
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81 ///
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82 /// fn acct_mgmt(pamh: &PamHandle, args: Vec<&CStr>, flags: PamFlag) -> PamResultCode {
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83 /// println!("Everybody is authorized!");
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84 /// PamResultCode::PAM_SUCCESS
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85 /// }
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86 /// }
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87 /// ```
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88 #[macro_export]
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89 macro_rules! pam_hooks {
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90 ($ident:ident) => (
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91 pub use self::pam_hooks_scope::*;
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92 mod pam_hooks_scope {
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93 use $crate::module::PamHandle;
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94 use $crate::constants::{PamFlag, PamResultCode};
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95 use $crate::hooks::PamHooks;
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96 use std::ffi::CStr;
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97 use std::os::raw::{c_char, c_int};
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98
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99 fn extract_argv<'a>(argc: c_int, argv: *const *const c_char) -> Vec<&'a CStr> {
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100 (0..argc)
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101 .map(|o| unsafe {
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102 CStr::from_ptr(*argv.offset(o as isize) as *const c_char)
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103 })
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104 .collect()
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105 }
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106
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107 #[no_mangle]
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108 pub extern "C" fn pam_sm_acct_mgmt(
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109 pamh: &PamHandle,
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110 flags: PamFlag,
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111 argc: c_int,
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112 argv: *const *const c_char,
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113 ) -> PamResultCode {
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114 let args = extract_argv(argc, argv);
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115 super::$ident::acct_mgmt(pamh, args, flags)
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116 }
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117
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118 #[no_mangle]
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119 pub extern "C" fn pam_sm_authenticate(
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120 pamh: &PamHandle,
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121 flags: PamFlag,
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122 argc: c_int,
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123 argv: *const *const c_char,
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124 ) -> PamResultCode {
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125 let args = extract_argv(argc, argv);
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126 super::$ident::sm_authenticate(pamh, args, flags)
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127 }
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128
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129 #[no_mangle]
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130 pub extern "C" fn pam_sm_chauthtok(
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131 pamh: &PamHandle,
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132 flags: PamFlag,
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133 argc: c_int,
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134 argv: *const *const c_char,
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135 ) -> PamResultCode {
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136 let args = extract_argv(argc, argv);
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137 super::$ident::sm_chauthtok(pamh, args, flags)
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138 }
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139
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140 #[no_mangle]
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141 pub extern "C" fn pam_sm_close_session(
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142 pamh: &PamHandle,
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143 flags: PamFlag,
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144 argc: c_int,
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145 argv: *const *const c_char,
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146 ) -> PamResultCode {
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147 let args = extract_argv(argc, argv);
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148 super::$ident::sm_close_session(pamh, args, flags)
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149 }
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150
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151 #[no_mangle]
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152 pub extern "C" fn pam_sm_open_session(
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153 pamh: &PamHandle,
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154 flags: PamFlag,
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155 argc: c_int,
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156 argv: *const *const c_char,
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157 ) -> PamResultCode {
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158 let args = extract_argv(argc, argv);
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159 super::$ident::sm_open_session(pamh, args, flags)
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160 }
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161
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162 #[no_mangle]
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163 pub extern "C" fn pam_sm_setcred(
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164 pamh: &PamHandle,
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165 flags: PamFlag,
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166 argc: c_int,
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167 argv: *const *const c_char,
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168 ) -> PamResultCode {
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169 let args = extract_argv(argc, argv);
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170 super::$ident::sm_setcred(pamh, args, flags)
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171 }
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172 }
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173 )
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174 }
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175
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176 #[cfg(test)]
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177 pub mod test {
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178 use super::PamHooks;
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179
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180 struct Foo;
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181 impl PamHooks for Foo {}
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182
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183 pam_hooks!(Foo);
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184 }