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annotate src/constants.rs @ 105:13b4d2a19674

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Support Rust v1.75.0. This is the version included in Ubuntu 24.04 LTS and Debian Trixie, so it's old enough to have wide penetration without being too old to get new features (Debian Stable, I love you but v1.63 is just not going to work out).
author Paul Fisher <paul@pfish.zone>
date Thu, 26 Jun 2025 00:48:51 -0400
parents dfcd96a74ac4
children e97534be35e3
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 //! Constants and enum values from the PAM library.
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2
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3 // We have a lot of dumb casts that we just gotta do because of differences
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4 // between Linux-PAM and OpenPAM header files.
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5 #![allow(clippy::unnecessary_cast)]
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6
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7 #[cfg(feature = "link")]
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8 use crate::libpam::pam_ffi;
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9 use crate::{_linklist, _man7, _manbsd, _xsso};
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10 use bitflags::bitflags;
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11 use libc::c_int;
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12 use num_enum::{IntoPrimitive, TryFromPrimitive};
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13 use std::error::Error;
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14 use std::ffi::c_uint;
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15 use std::fmt;
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16 use std::fmt::{Display, Formatter};
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17 use std::result::Result as StdResult;
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18
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19 /// Arbitrary values for PAM constants when not linking against system PAM.
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20 ///
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21 /// **The values of these constants are deliberately selected _not_ to match
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22 /// any PAM implementations. Applications should always use the symbolic value
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23 /// and not a magic number.**
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24 #[cfg(not(feature = "link"))]
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25 mod pam_ffi {
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26 use std::ffi::c_uint;
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27
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28 macro_rules! define {
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29 ($(#[$attr:meta])* $($name:ident = $value:expr),+) => {
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30 define!(
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31 @meta { $(#[$attr])* }
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32 $(pub const $name: u32 = $value;)+
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33 );
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34 };
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35 (@meta $m:tt $($i:item)+) => { define!(@expand $($m $i)+); };
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36 (@expand $({ $(#[$m:meta])* } $i:item)+) => {$($(#[$m])* $i)+};
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37 }
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38 const fn bit(n: u8) -> u32 {
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39 1 << n
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40 }
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41 define!(
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42 PAM_SILENT = bit(13),
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43 PAM_DISALLOW_NULL_AUTHTOK = bit(14),
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44 PAM_ESTABLISH_CRED = bit(15),
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45 PAM_DELETE_CRED = bit(16),
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46 PAM_REINITIALIZE_CRED = bit(17),
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47 PAM_REFRESH_CRED = bit(18),
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48 PAM_CHANGE_EXPIRED_AUTHTOK = bit(19),
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49 PAM_PRELIM_CHECK = bit(20),
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50 PAM_UPDATE_AUTHTOK = bit(21)
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51 );
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52
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53 define!(
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54 PAM_ABORT = 513,
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55 PAM_ACCT_EXPIRED = 514,
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56 PAM_AUTHINFO_UNAVAIL = 515,
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57 PAM_AUTHTOK_DISABLE_AGING = 516,
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58 PAM_AUTHTOK_ERR = 517,
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59 PAM_AUTHTOK_EXPIRED = 518,
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60 PAM_AUTHTOK_LOCK_BUSY = 519,
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61 PAM_AUTHTOK_RECOVERY_ERR = 520,
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62 PAM_AUTH_ERR = 521,
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63 PAM_BAD_ITEM = 522,
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64 PAM_BUF_ERR = 533,
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65 PAM_CONV_AGAIN = 534,
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66 PAM_CONV_ERR = 535,
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67 PAM_CRED_ERR = 536,
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68 PAM_CRED_EXPIRED = 537,
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69 PAM_CRED_INSUFFICIENT = 538,
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70 PAM_CRED_UNAVAIL = 539,
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71 PAM_IGNORE = 540,
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72 PAM_INCOMPLETE = 541,
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73 PAM_MAXTRIES = 542,
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74 PAM_MODULE_UNKNOWN = 543,
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75 PAM_NEW_AUTHTOK_REQD = 544,
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76 PAM_NO_MODULE_DATA = 545,
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77 PAM_OPEN_ERR = 546,
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78 PAM_PERM_DENIED = 547,
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79 PAM_SERVICE_ERR = 548,
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80 PAM_SESSION_ERR = 549,
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81 PAM_SYMBOL_ERR = 550,
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82 PAM_SYSTEM_ERR = 551,
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83 PAM_TRY_AGAIN = 552,
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84 PAM_USER_UNKNOWN = 553
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85 );
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86
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87 /// Dummy implementation of strerror so that it always returns None.
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88 pub fn strerror(val: c_uint) -> Option<&'static str> {
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89 _ = val;
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90 None
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91 }
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92 }
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93
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94 bitflags! {
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95 /// The available PAM flags.
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96 ///
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97 /// See `/usr/include/security/_pam_types.h` and
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98 /// See `/usr/include/security/pam_modules.h` for more details.
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99 #[derive(Debug, Default, PartialEq)]
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100 #[repr(transparent)]
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101 pub struct Flags: c_uint {
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102 /// The module should not generate any messages.
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103 const SILENT = pam_ffi::PAM_SILENT as u32;
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104
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105 /// The module should return [ErrorCode::AuthError]
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106 /// if the user has an empty authentication token
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107 /// rather than immediately accepting them.
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108 const DISALLOW_NULL_AUTHTOK = pam_ffi::PAM_DISALLOW_NULL_AUTHTOK as u32;
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109
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110 // Flag used for `set_credentials`.
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111
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112 /// Set user credentials for an authentication service.
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113 const ESTABLISH_CREDENTIALS = pam_ffi::PAM_ESTABLISH_CRED as u32;
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114 /// Delete user credentials associated with
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115 /// an authentication service.
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116 const DELETE_CREDENTIALS = pam_ffi::PAM_DELETE_CRED as u32;
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117 /// Reinitialize user credentials.
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118 const REINITIALIZE_CREDENTIALS = pam_ffi::PAM_REINITIALIZE_CRED as u32;
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119 /// Extend the lifetime of user credentials.
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120 const REFRESH_CREDENTIALS = pam_ffi::PAM_REFRESH_CRED as u32;
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121
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122 // Flags used for password changing.
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123
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124 /// The password service should only update those passwords
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125 /// that have aged. If this flag is _not_ passed,
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126 /// the password service should update all passwords.
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127 ///
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128 /// This flag is only used by `change_authtok`.
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129 const CHANGE_EXPIRED_AUTHTOK = pam_ffi::PAM_CHANGE_EXPIRED_AUTHTOK as u32;
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130 /// This is a preliminary check for password changing.
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131 /// The password should not be changed.
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132 ///
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133 /// This is only used between PAM and a module.
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134 /// Applications may not use this flag.
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135 ///
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136 /// This flag is only used by `change_authtok`.
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137 const PRELIMINARY_CHECK = pam_ffi::PAM_PRELIM_CHECK as u32;
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138 /// The password should actuallyPR be updated.
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139 /// This and [Self::PRELIMINARY_CHECK] are mutually exclusive.
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140 ///
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141 /// This is only used between PAM and a module.
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142 /// Applications may not use this flag.
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143 ///
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144 /// This flag is only used by `change_authtok`.
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145 const UPDATE_AUTHTOK = pam_ffi::PAM_UPDATE_AUTHTOK as u32;
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146 }
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147 }
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148
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149 /// The PAM error return codes.
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150 ///
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151 /// These are returned by most PAM functions if an error of some kind occurs.
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152 ///
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153 /// Instead of being an error code, success is represented by an Ok [`Result`].
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154 ///
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155 /// # References
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156 ///
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157 #[doc = _linklist!(pam: man7, manbsd)]
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158 /// - [X/SSO error code specification][xsso]
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159 ///
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160 #[doc = _man7!(3 pam "RETURN_VALUES")]
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161 #[doc = _manbsd!(3 pam "RETURN%20VALUES")]
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162 #[doc = _xsso!("chap5.htm#tagcjh_06_02")]
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163 #[allow(non_camel_case_types, dead_code)]
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164 #[derive(Copy, Clone, Debug, PartialEq, TryFromPrimitive, IntoPrimitive)]
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165 #[non_exhaustive] // C might give us anything!
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166 #[repr(u32)]
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167 pub enum ErrorCode {
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168 OpenError = pam_ffi::PAM_OPEN_ERR,
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169 SymbolError = pam_ffi::PAM_SYMBOL_ERR,
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170 ServiceError = pam_ffi::PAM_SERVICE_ERR,
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171 SystemError = pam_ffi::PAM_SYSTEM_ERR,
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172 BufferError = pam_ffi::PAM_BUF_ERR,
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173 PermissionDenied = pam_ffi::PAM_PERM_DENIED,
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174 AuthenticationError = pam_ffi::PAM_AUTH_ERR,
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175 CredentialsInsufficient = pam_ffi::PAM_CRED_INSUFFICIENT,
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176 AuthInfoUnavailable = pam_ffi::PAM_AUTHINFO_UNAVAIL,
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177 UserUnknown = pam_ffi::PAM_USER_UNKNOWN,
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178 MaxTries = pam_ffi::PAM_MAXTRIES,
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179 NewAuthTokRequired = pam_ffi::PAM_NEW_AUTHTOK_REQD,
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180 AccountExpired = pam_ffi::PAM_ACCT_EXPIRED,
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181 SessionError = pam_ffi::PAM_SESSION_ERR,
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182 CredentialsUnavailable = pam_ffi::PAM_CRED_UNAVAIL,
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183 CredentialsExpired = pam_ffi::PAM_CRED_EXPIRED,
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184 CredentialsError = pam_ffi::PAM_CRED_ERR,
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185 NoModuleData = pam_ffi::PAM_NO_MODULE_DATA,
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186 ConversationError = pam_ffi::PAM_CONV_ERR,
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187 AuthTokError = pam_ffi::PAM_AUTHTOK_ERR,
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188 AuthTokRecoveryError = pam_ffi::PAM_AUTHTOK_RECOVERY_ERR,
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189 AuthTokLockBusy = pam_ffi::PAM_AUTHTOK_LOCK_BUSY,
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190 AuthTokDisableAging = pam_ffi::PAM_AUTHTOK_DISABLE_AGING,
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191 TryAgain = pam_ffi::PAM_TRY_AGAIN,
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192 Ignore = pam_ffi::PAM_IGNORE,
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193 Abort = pam_ffi::PAM_ABORT,
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194 AuthTokExpired = pam_ffi::PAM_AUTHTOK_EXPIRED,
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195 ModuleUnknown = pam_ffi::PAM_MODULE_UNKNOWN,
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196 BadItem = pam_ffi::PAM_BAD_ITEM,
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197 #[cfg(feature = "linux-pam-extensions")]
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198 ConversationAgain = pam_ffi::PAM_CONV_AGAIN,
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199 #[cfg(feature = "linux-pam-extensions")]
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200 Incomplete = pam_ffi::PAM_INCOMPLETE,
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201 }
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202
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203 /// A PAM-specific Result type with an [ErrorCode] error.
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204 pub type Result<T> = StdResult<T, ErrorCode>;
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205
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206 impl Display for ErrorCode {
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207 fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
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208 match pam_ffi::strerror((*self).into()) {
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209 Some(err) => f.write_str(err),
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210 None => self.fmt_internal(f),
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211 }
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212 }
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213 }
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214
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215 impl Error for ErrorCode {}
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216
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217 impl ErrorCode {
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218 /// Converts this [Result] into a C-compatible result code.
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219 pub fn result_to_c<T>(value: Result<T>) -> c_int {
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220 match value {
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221 Ok(_) => 0, // PAM_SUCCESS
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222 Err(otherwise) => u32::from(otherwise) as i32,
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223 }
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224 }
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225
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226 /// Converts a C result code into a [Result], with success as Ok.
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227 /// Invalid values are returned as a [Self::SystemError].
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228 pub fn result_from(value: c_int) -> Result<()> {
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229 match value {
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230 0 => Ok(()),
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231 value => Err((value as u32).try_into().unwrap_or(Self::SystemError)),
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232 }
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233 }
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234
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235 /// A basic Display implementation for if we don't link against PAM.
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236 fn fmt_internal(self, f: &mut Formatter<'_>) -> fmt::Result {
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237 write!(f, "PAM error: {self:?} ({n})", n = self as c_uint)
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238 }
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239 }
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240
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241 #[cfg(test)]
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242 mod tests {
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243 use super::*;
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244
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245 #[test]
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246 fn test_enums() {
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247 assert_eq!(Ok(()), ErrorCode::result_from(0));
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248 assert_eq!(
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249 pam_ffi::PAM_BAD_ITEM as i32,
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250 ErrorCode::result_to_c::<()>(Err(ErrorCode::BadItem))
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251 );
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252 assert_eq!(
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253 Err(ErrorCode::Abort),
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254 ErrorCode::result_from(pam_ffi::PAM_ABORT as i32)
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255 );
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256 assert_eq!(Err(ErrorCode::SystemError), ErrorCode::result_from(423));
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257 }
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258 }