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annotate src/constants.rs @ 84:a638a45e5f1f

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do some real irritating i32/u32 juggling to make bindgen happy
author Paul Fisher <paul@pfish.zone>
date Tue, 10 Jun 2025 02:35:11 -0400
parents 5aa1a010f1e8
children 5e14bb093851
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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 #[cfg(feature = "link")]
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4 use crate::libpam::pam_ffi;
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5 use bitflags::bitflags;
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6 use libc::c_int;
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7 use num_enum::{IntoPrimitive, TryFromPrimitive};
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8 use std::ffi::c_uint;
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9 use std::result::Result as StdResult;
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11 /// Arbitrary values for PAM constants when not linking against system PAM.
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12 ///
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13 /// **The values of these constants are deliberately selected _not_ to match
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14 /// any PAM implementations. Applications should always use the symbolic value
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15 /// and not a magic number.**
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16 #[cfg(not(feature = "link"))]
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17 mod ffi {
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18 macro_rules! define {
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19 ($(#[$attr:meta])* $($name:ident = $value:expr),+) => {
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20 define!(
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21 @meta { $(#[$attr])* }
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22 $(pub const $name: u32 = $value;)+
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23 );
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24 };
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25 (@meta $m:tt $($i:item)+) => { define!(@expand $($m $i)+); };
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26 (@expand $({ $(#[$m:meta])* } $i:item)+) => {$($(#[$m])* $i)+};
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27 }
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28 const fn bit(n: u8) -> u32 {
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29 1 << n
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30 }
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31 define!(
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32 PAM_SILENT = bit(13),
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33 PAM_DISALLOW_NULL_AUTHTOK = bit(14),
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34 PAM_ESTABLISH_CRED = bit(15),
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35 PAM_DELETE_CRED = bit(16),
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36 PAM_REINITIALIZE_CRED = bit(17),
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37 PAM_REFRESH_CRED = bit(18),
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38 PAM_CHANGE_EXPIRED_AUTHTOK = bit(19),
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39 PAM_PRELIM_CHECK = bit(20),
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40 PAM_UPDATE_AUTHTOK = bit(21)
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41 );
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42
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43 define!(
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44 PAM_ABORT = 513,
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45 PAM_ACCT_EXPIRED = 514,
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46 PAM_AUTHINFO_UNAVAIL = 515,
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47 PAM_AUTHTOK_DISABLE_AGING = 516,
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48 PAM_AUTHTOK_ERR = 517,
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49 PAM_AUTHTOK_EXPIRED = 518,
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50 PAM_AUTHTOK_LOCK_BUSY = 519,
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51 PAM_AUTHTOK_RECOVERY_ERR = 520,
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52 PAM_AUTH_ERR = 521,
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53 PAM_BAD_ITEM = 522,
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54 PAM_BUF_ERR = 533,
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55 PAM_CONV_AGAIN = 534,
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56 PAM_CONV_ERR = 535,
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57 PAM_CRED_ERR = 536,
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58 PAM_CRED_EXPIRED = 537,
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59 PAM_CRED_INSUFFICIENT = 538,
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60 PAM_CRED_UNAVAIL = 539,
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61 PAM_IGNORE = 540,
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62 PAM_INCOMPLETE = 541,
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63 PAM_MAXTRIES = 542,
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64 PAM_MODULE_UNKNOWN = 543,
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65 PAM_NEW_AUTHTOK_REQD = 544,
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66 PAM_NO_MODULE_DATA = 545,
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67 PAM_OPEN_ERR = 546,
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68 PAM_PERM_DENIED = 547,
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69 PAM_SERVICE_ERR = 548,
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70 PAM_SESSION_ERR = 549,
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71 PAM_SYMBOL_ERR = 550,
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72 PAM_SYSTEM_ERR = 551,
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73 PAM_TRY_AGAIN = 552,
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74 PAM_USER_UNKNOWN = 553
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75 );
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76 }
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77
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78 bitflags! {
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79 /// The available PAM flags.
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80 ///
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81 /// See `/usr/include/security/_pam_types.h` and
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82 /// See `/usr/include/security/pam_modules.h` for more details.
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83 #[derive(Debug, PartialEq)]
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84 #[repr(transparent)]
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85 pub struct Flags: c_uint {
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86 /// The module should not generate any messages.
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87 const SILENT = pam_ffi::PAM_SILENT;
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88
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89 /// The module should return [ErrorCode::AuthError]
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90 /// if the user has an empty authentication token
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91 /// rather than immediately accepting them.
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92 const DISALLOW_NULL_AUTHTOK = pam_ffi::PAM_DISALLOW_NULL_AUTHTOK;
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93
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94 // Flag used for `set_credentials`.
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95
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96 /// Set user credentials for an authentication service.
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97 const ESTABLISH_CREDENTIALS = pam_ffi::PAM_ESTABLISH_CRED;
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98 /// Delete user credentials associated with
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99 /// an authentication service.
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100 const DELETE_CREDENTIALS = pam_ffi::PAM_DELETE_CRED;
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101 /// Reinitialize user credentials.
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102 const REINITIALIZE_CREDENTIALS = pam_ffi::PAM_REINITIALIZE_CRED;
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103 /// Extend the lifetime of user credentials.
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104 const REFRESH_CREDENTIALS = pam_ffi::PAM_REFRESH_CRED;
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105
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106 // Flags used for password changing.
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107
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108 /// The password service should only update those passwords
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109 /// that have aged. If this flag is _not_ passed,
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110 /// the password service should update all passwords.
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111 ///
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112 /// This flag is only used by `change_authtok`.
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113 const CHANGE_EXPIRED_AUTHTOK = pam_ffi::PAM_CHANGE_EXPIRED_AUTHTOK;
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114
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115 /// This is a preliminary check for password changing.
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116 /// The password should not be changed.
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117 ///
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118 /// This is only used between PAM and a module.
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119 /// Applications may not use this flag.
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120 ///
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121 /// This flag is only used by `change_authtok`.
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122 const PRELIMINARY_CHECK = pam_ffi::PAM_PRELIM_CHECK;
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123 /// The password should actuallyPR be updated.
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124 /// This and [Self::PRELIMINARY_CHECK] are mutually exclusive.
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125 ///
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126 /// This is only used between PAM and a module.
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127 /// Applications may not use this flag.
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128 ///
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129 /// This flag is only used by `change_authtok`.
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130 const UPDATE_AUTHTOK = pam_ffi::PAM_UPDATE_AUTHTOK;
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131 }
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132 }
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133
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134 /// The Linux-PAM error return values. Success is an Ok [Result].
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135 ///
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136 /// Most abbreviations (except `AuthTok` and `Max`) are now full words.
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137 /// For more detailed information, see
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138 /// `/usr/include/security/_pam_types.h`.
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139 #[allow(non_camel_case_types, dead_code)]
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140 #[derive(Copy, Clone, Debug, PartialEq, thiserror::Error, TryFromPrimitive, IntoPrimitive)]
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141 #[non_exhaustive] // C might give us anything!
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142 #[repr(u32)]
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143 pub enum ErrorCode {
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144 #[error("dlopen() failure when dynamically loading a service module")]
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145 OpenError = pam_ffi::PAM_OPEN_ERR,
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146 #[error("symbol not found")]
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147 SymbolError = pam_ffi::PAM_SYMBOL_ERR,
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148 #[error("error in service module")]
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149 ServiceError = pam_ffi::PAM_SERVICE_ERR,
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150 #[error("system error")]
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151 SystemError = pam_ffi::PAM_SYSTEM_ERR,
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152 #[error("memory buffer error")]
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153 BufferError = pam_ffi::PAM_BUF_ERR,
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154 #[error("permission denied")]
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155 PermissionDenied = pam_ffi::PAM_PERM_DENIED,
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156 #[error("authentication failure")]
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157 AuthenticationError = pam_ffi::PAM_AUTH_ERR,
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158 #[error("cannot access authentication data due to insufficient credentials")]
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159 CredentialsInsufficient = pam_ffi::PAM_CRED_INSUFFICIENT,
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160 #[error("underlying authentication service cannot retrieve authentication information")]
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161 AuthInfoUnavailable = pam_ffi::PAM_AUTHINFO_UNAVAIL,
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162 #[error("user not known to the underlying authentication module")]
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163 UserUnknown = pam_ffi::PAM_USER_UNKNOWN,
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164 #[error("retry limit reached; do not attempt further")]
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165 MaxTries = pam_ffi::PAM_MAXTRIES,
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166 #[error("new authentication token required")]
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167 NewAuthTokRequired = pam_ffi::PAM_NEW_AUTHTOK_REQD,
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168 #[error("user account has expired")]
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169 AccountExpired = pam_ffi::PAM_ACCT_EXPIRED,
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170 #[error("cannot make/remove an entry for the specified session")]
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171 SessionError = pam_ffi::PAM_SESSION_ERR,
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172 #[error("underlying authentication service cannot retrieve user credentials")]
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173 CredentialsUnavailable = pam_ffi::PAM_CRED_UNAVAIL,
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174 #[error("user credentials expired")]
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175 CredentialsExpired = pam_ffi::PAM_CRED_EXPIRED,
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176 #[error("failure setting user credentials")]
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177 CredentialsError = pam_ffi::PAM_CRED_ERR,
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178 #[error("no module-specific data is present")]
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179 NoModuleData = pam_ffi::PAM_NO_MODULE_DATA,
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180 #[error("conversation error")]
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181 ConversationError = pam_ffi::PAM_CONV_ERR,
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182 #[error("authentication token manipulation error")]
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183 AuthTokError = pam_ffi::PAM_AUTHTOK_ERR,
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184 #[error("authentication information cannot be recovered")]
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185 AuthTokRecoveryError = pam_ffi::PAM_AUTHTOK_RECOVERY_ERR,
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186 #[error("authentication token lock busy")]
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187 AuthTokLockBusy = pam_ffi::PAM_AUTHTOK_LOCK_BUSY,
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188 #[error("authentication token aging disabled")]
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189 AuthTokDisableAging = pam_ffi::PAM_AUTHTOK_DISABLE_AGING,
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190 #[error("preliminary password check failed")]
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191 TryAgain = pam_ffi::PAM_TRY_AGAIN,
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192 #[error("ignore underlying account module, regardless of control flag")]
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193 Ignore = pam_ffi::PAM_IGNORE,
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194 #[error("critical error; this module should fail now")]
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195 Abort = pam_ffi::PAM_ABORT,
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196 #[error("authentication token has expired")]
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197 AuthTokExpired = pam_ffi::PAM_AUTHTOK_EXPIRED,
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198 #[error("module is not known")]
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199 ModuleUnknown = pam_ffi::PAM_MODULE_UNKNOWN,
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200 #[error("bad item passed to pam_[whatever]_item")]
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201 BadItem = pam_ffi::PAM_BAD_ITEM,
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202 #[error("conversation function is event-driven and data is not available yet")]
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203 ConversationAgain = pam_ffi::PAM_CONV_AGAIN,
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204 #[error("call this function again to complete authentication stack")]
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205 Incomplete = pam_ffi::PAM_INCOMPLETE,
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206 }
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207
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208 /// A PAM-specific Result type with an [ErrorCode] error.
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209 pub type Result<T> = StdResult<T, ErrorCode>;
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210
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diff changeset
211 impl ErrorCode {
60
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212 /// Converts this [Result] into a C-compatible result code.
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213 pub fn result_to_c<T>(value: Result<T>) -> c_int {
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diff changeset
214 match value {
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215 Ok(_) => 0, // PAM_SUCCESS
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diff changeset
216 Err(otherwise) => u32::from(otherwise) as i32,
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217 }
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218 }
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219
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220 /// Converts a C result code into a [Result], with success as Ok.
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221 /// Invalid values are returned as a [Self::SystemError].
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222 pub fn result_from(value: c_int) -> Result<()> {
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diff changeset
223 match value {
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diff changeset
224 0 => Ok(()),
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225 value => Err((value as u32).try_into().unwrap_or(Self::SystemError)),
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226 }
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227 }
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228 }
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diff changeset
229
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diff changeset
230 /// Returned when text that should not have any `\0` bytes in it does.
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diff changeset
231 /// Analogous to [`std::ffi::NulError`], but the data it was created from
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diff changeset
232 /// is borrowed.
59
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diff changeset
233 #[cfg(test)]
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diff changeset
234 mod tests {
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diff changeset
235 use super::*;
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236
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diff changeset
237 #[test]
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diff changeset
238 fn test_enums() {
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diff changeset
239 assert_eq!(Ok(()), ErrorCode::result_from(0));
80
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diff changeset
240 assert_eq!(
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diff changeset
241 pam_ffi::PAM_BAD_ITEM as i32,
80
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diff changeset
242 ErrorCode::result_to_c::<()>(Err(ErrorCode::BadItem))
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diff changeset
243 );
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diff changeset
244 assert_eq!(
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diff changeset
245 Err(ErrorCode::Abort),
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diff changeset
246 ErrorCode::result_from(pam_ffi::PAM_ABORT as i32)
80
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diff changeset
247 );
59
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diff changeset
248 assert_eq!(Err(ErrorCode::SystemError), ErrorCode::result_from(423));
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diff changeset
249 }
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diff changeset
250 }