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Well and truly separate the Linux extensions. This separates the Linux extensions on the libpam side, and disables the two enums on the interface side. Users can still call the Linux extensions from non-Linux PAM impls, but they'll get a conversation error back.
author Paul Fisher <paul@pfish.zone>
date Tue, 10 Jun 2025 04:40:01 -0400
parents 23162cd399aa
children
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
87
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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 bitflags::bitflags;
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10 use libc::c_int;
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11 use num_enum::{IntoPrimitive, TryFromPrimitive};
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12 use std::ffi::c_uint;
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13 use std::result::Result as StdResult;
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14
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15 /// Arbitrary values for PAM constants when not linking against system PAM.
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16 ///
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17 /// **The values of these constants are deliberately selected _not_ to match
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18 /// any PAM implementations. Applications should always use the symbolic value
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19 /// and not a magic number.**
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20 #[cfg(not(feature = "link"))]
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21 mod pam_ffi {
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22 macro_rules! define {
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23 ($(#[$attr:meta])* $($name:ident = $value:expr),+) => {
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24 define!(
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25 @meta { $(#[$attr])* }
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26 $(pub const $name: u32 = $value;)+
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27 );
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28 };
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29 (@meta $m:tt $($i:item)+) => { define!(@expand $($m $i)+); };
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30 (@expand $({ $(#[$m:meta])* } $i:item)+) => {$($(#[$m])* $i)+};
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31 }
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32 const fn bit(n: u8) -> u32 {
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33 1 << n
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34 }
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35 define!(
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36 PAM_SILENT = bit(13),
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37 PAM_DISALLOW_NULL_AUTHTOK = bit(14),
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38 PAM_ESTABLISH_CRED = bit(15),
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39 PAM_DELETE_CRED = bit(16),
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40 PAM_REINITIALIZE_CRED = bit(17),
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41 PAM_REFRESH_CRED = bit(18),
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42 PAM_CHANGE_EXPIRED_AUTHTOK = bit(19),
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43 PAM_PRELIM_CHECK = bit(20),
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44 PAM_UPDATE_AUTHTOK = bit(21)
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45 );
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46
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47 define!(
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48 PAM_ABORT = 513,
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49 PAM_ACCT_EXPIRED = 514,
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50 PAM_AUTHINFO_UNAVAIL = 515,
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51 PAM_AUTHTOK_DISABLE_AGING = 516,
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52 PAM_AUTHTOK_ERR = 517,
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53 PAM_AUTHTOK_EXPIRED = 518,
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54 PAM_AUTHTOK_LOCK_BUSY = 519,
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55 PAM_AUTHTOK_RECOVERY_ERR = 520,
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56 PAM_AUTH_ERR = 521,
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57 PAM_BAD_ITEM = 522,
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58 PAM_BUF_ERR = 533,
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59 PAM_CONV_AGAIN = 534,
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60 PAM_CONV_ERR = 535,
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61 PAM_CRED_ERR = 536,
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62 PAM_CRED_EXPIRED = 537,
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63 PAM_CRED_INSUFFICIENT = 538,
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64 PAM_CRED_UNAVAIL = 539,
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65 PAM_IGNORE = 540,
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66 PAM_INCOMPLETE = 541,
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67 PAM_MAXTRIES = 542,
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68 PAM_MODULE_UNKNOWN = 543,
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69 PAM_NEW_AUTHTOK_REQD = 544,
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70 PAM_NO_MODULE_DATA = 545,
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71 PAM_OPEN_ERR = 546,
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72 PAM_PERM_DENIED = 547,
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73 PAM_SERVICE_ERR = 548,
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74 PAM_SESSION_ERR = 549,
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75 PAM_SYMBOL_ERR = 550,
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76 PAM_SYSTEM_ERR = 551,
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77 PAM_TRY_AGAIN = 552,
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78 PAM_USER_UNKNOWN = 553
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79 );
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80 }
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81
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82 bitflags! {
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83 /// The available PAM flags.
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84 ///
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85 /// See `/usr/include/security/_pam_types.h` and
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86 /// See `/usr/include/security/pam_modules.h` for more details.
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87 #[derive(Debug, PartialEq)]
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88 #[repr(transparent)]
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89 pub struct Flags: c_uint {
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90 /// The module should not generate any messages.
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91 const SILENT = pam_ffi::PAM_SILENT as u32;
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92
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93 /// The module should return [ErrorCode::AuthError]
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94 /// if the user has an empty authentication token
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95 /// rather than immediately accepting them.
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96 const DISALLOW_NULL_AUTHTOK = pam_ffi::PAM_DISALLOW_NULL_AUTHTOK as u32;
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97
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98 // Flag used for `set_credentials`.
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99
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100 /// Set user credentials for an authentication service.
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101 const ESTABLISH_CREDENTIALS = pam_ffi::PAM_ESTABLISH_CRED as u32;
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102 /// Delete user credentials associated with
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103 /// an authentication service.
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104 const DELETE_CREDENTIALS = pam_ffi::PAM_DELETE_CRED as u32;
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105 /// Reinitialize user credentials.
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106 const REINITIALIZE_CREDENTIALS = pam_ffi::PAM_REINITIALIZE_CRED as u32;
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107 /// Extend the lifetime of user credentials.
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108 const REFRESH_CREDENTIALS = pam_ffi::PAM_REFRESH_CRED as u32;
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109
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110 // Flags used for password changing.
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111
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112 /// The password service should only update those passwords
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113 /// that have aged. If this flag is _not_ passed,
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114 /// the password service should update all passwords.
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115 ///
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116 /// This flag is only used by `change_authtok`.
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117 const CHANGE_EXPIRED_AUTHTOK = pam_ffi::PAM_CHANGE_EXPIRED_AUTHTOK as u32;
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118 /// This is a preliminary check for password changing.
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119 /// The password should not be changed.
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120 ///
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121 /// This is only used between PAM and a module.
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122 /// Applications may not use this flag.
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123 ///
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124 /// This flag is only used by `change_authtok`.
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125 const PRELIMINARY_CHECK = pam_ffi::PAM_PRELIM_CHECK as u32;
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126 /// The password should actuallyPR be updated.
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127 /// This and [Self::PRELIMINARY_CHECK] are mutually exclusive.
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128 ///
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129 /// This is only used between PAM and a module.
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130 /// Applications may not use this flag.
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131 ///
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132 /// This flag is only used by `change_authtok`.
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133 const UPDATE_AUTHTOK = pam_ffi::PAM_UPDATE_AUTHTOK as u32;
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134 }
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135 }
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136
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137 /// The Linux-PAM error return values. Success is an Ok [Result].
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138 ///
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139 /// Most abbreviations (except `AuthTok` and `Max`) are now full words.
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140 /// For more detailed information, see
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141 /// `/usr/include/security/_pam_types.h`.
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142 #[allow(non_camel_case_types, dead_code)]
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143 #[derive(Copy, Clone, Debug, PartialEq, thiserror::Error, TryFromPrimitive, IntoPrimitive)]
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144 #[non_exhaustive] // C might give us anything!
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145 #[repr(u32)]
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146 pub enum ErrorCode {
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147 #[error("dlopen() failure when dynamically loading a service module")]
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148 OpenError = pam_ffi::PAM_OPEN_ERR,
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149 #[error("symbol not found")]
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150 SymbolError = pam_ffi::PAM_SYMBOL_ERR,
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151 #[error("error in service module")]
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152 ServiceError = pam_ffi::PAM_SERVICE_ERR,
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153 #[error("system error")]
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154 SystemError = pam_ffi::PAM_SYSTEM_ERR,
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155 #[error("memory buffer error")]
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156 BufferError = pam_ffi::PAM_BUF_ERR,
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157 #[error("permission denied")]
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158 PermissionDenied = pam_ffi::PAM_PERM_DENIED,
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159 #[error("authentication failure")]
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160 AuthenticationError = pam_ffi::PAM_AUTH_ERR,
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161 #[error("cannot access authentication data due to insufficient credentials")]
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162 CredentialsInsufficient = pam_ffi::PAM_CRED_INSUFFICIENT,
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163 #[error("underlying authentication service cannot retrieve authentication information")]
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164 AuthInfoUnavailable = pam_ffi::PAM_AUTHINFO_UNAVAIL,
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165 #[error("user not known to the underlying authentication module")]
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166 UserUnknown = pam_ffi::PAM_USER_UNKNOWN,
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167 #[error("retry limit reached; do not attempt further")]
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168 MaxTries = pam_ffi::PAM_MAXTRIES,
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169 #[error("new authentication token required")]
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170 NewAuthTokRequired = pam_ffi::PAM_NEW_AUTHTOK_REQD,
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171 #[error("user account has expired")]
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172 AccountExpired = pam_ffi::PAM_ACCT_EXPIRED,
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173 #[error("cannot make/remove an entry for the specified session")]
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174 SessionError = pam_ffi::PAM_SESSION_ERR,
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175 #[error("underlying authentication service cannot retrieve user credentials")]
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176 CredentialsUnavailable = pam_ffi::PAM_CRED_UNAVAIL,
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177 #[error("user credentials expired")]
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178 CredentialsExpired = pam_ffi::PAM_CRED_EXPIRED,
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179 #[error("failure setting user credentials")]
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180 CredentialsError = pam_ffi::PAM_CRED_ERR,
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181 #[error("no module-specific data is present")]
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182 NoModuleData = pam_ffi::PAM_NO_MODULE_DATA,
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183 #[error("conversation error")]
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184 ConversationError = pam_ffi::PAM_CONV_ERR,
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185 #[error("authentication token manipulation error")]
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186 AuthTokError = pam_ffi::PAM_AUTHTOK_ERR,
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187 #[error("authentication information cannot be recovered")]
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188 AuthTokRecoveryError = pam_ffi::PAM_AUTHTOK_RECOVERY_ERR,
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189 #[error("authentication token lock busy")]
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190 AuthTokLockBusy = pam_ffi::PAM_AUTHTOK_LOCK_BUSY,
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191 #[error("authentication token aging disabled")]
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192 AuthTokDisableAging = pam_ffi::PAM_AUTHTOK_DISABLE_AGING,
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193 #[error("preliminary password check failed")]
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194 TryAgain = pam_ffi::PAM_TRY_AGAIN,
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195 #[error("ignore underlying account module, regardless of control flag")]
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196 Ignore = pam_ffi::PAM_IGNORE,
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197 #[error("critical error; this module should fail now")]
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198 Abort = pam_ffi::PAM_ABORT,
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199 #[error("authentication token has expired")]
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200 AuthTokExpired = pam_ffi::PAM_AUTHTOK_EXPIRED,
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201 #[error("module is not known")]
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202 ModuleUnknown = pam_ffi::PAM_MODULE_UNKNOWN,
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203 #[error("bad item passed to pam_[whatever]_item")]
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204 BadItem = pam_ffi::PAM_BAD_ITEM,
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205 #[cfg(feature = "linux-pam-extensions")]
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206 #[error("conversation function is event-driven and data is not available yet")]
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207 ConversationAgain = pam_ffi::PAM_CONV_AGAIN,
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208 #[cfg(feature = "linux-pam-extensions")]
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209 #[error("call this function again to complete authentication stack")]
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210 Incomplete = pam_ffi::PAM_INCOMPLETE,
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211 }
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212
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213 /// A PAM-specific Result type with an [ErrorCode] error.
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214 pub type Result<T> = StdResult<T, ErrorCode>;
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215
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216 impl ErrorCode {
60
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217 /// Converts this [Result] into a C-compatible result code.
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218 pub fn result_to_c<T>(value: Result<T>) -> c_int {
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219 match value {
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220 Ok(_) => 0, // PAM_SUCCESS
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221 Err(otherwise) => u32::from(otherwise) as i32,
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222 }
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223 }
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224
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225 /// Converts a C result code into a [Result], with success as Ok.
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226 /// Invalid values are returned as a [Self::SystemError].
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227 pub fn result_from(value: c_int) -> Result<()> {
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228 match value {
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229 0 => Ok(()),
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diff changeset
230 value => Err((value as u32).try_into().unwrap_or(Self::SystemError)),
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231 }
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232 }
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233 }
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234
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235 /// Returned when text that should not have any `\0` bytes in it does.
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236 /// Analogous to [`std::ffi::NulError`], but the data it was created from
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237 /// is borrowed.
59
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diff changeset
238 #[cfg(test)]
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diff changeset
239 mod tests {
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diff changeset
240 use super::*;
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241
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diff changeset
242 #[test]
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diff changeset
243 fn test_enums() {
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diff changeset
244 assert_eq!(Ok(()), ErrorCode::result_from(0));
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diff changeset
245 assert_eq!(
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diff changeset
246 pam_ffi::PAM_BAD_ITEM as i32,
80
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diff changeset
247 ErrorCode::result_to_c::<()>(Err(ErrorCode::BadItem))
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diff changeset
248 );
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diff changeset
249 assert_eq!(
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diff changeset
250 Err(ErrorCode::Abort),
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diff changeset
251 ErrorCode::result_from(pam_ffi::PAM_ABORT as i32)
80
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diff changeset
252 );
59
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diff changeset
253 assert_eq!(Err(ErrorCode::SystemError), ErrorCode::result_from(423));
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diff changeset
254 }
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diff changeset
255 }