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annotate src/constants.rs @ 103:dfcd96a74ac4 default tip

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write a truly prodigious amount of documentation adds a bunch of links to the OpenPAM man pages and the XSSO spec as well as just a bunch of prose and stuff.
author Paul Fisher <paul@pfish.zone>
date Wed, 25 Jun 2025 00:59:24 -0400
parents efe2f5f8b5b2
children
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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 }