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annotate src/constants.rs @ 132:0b6a17f8c894

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Get constant test working again with OpenPAM.
author Paul Fisher <paul@pfish.zone>
date Wed, 02 Jul 2025 02:34:29 -0400
parents a632a8874131
children efbc235f01d3
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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 use crate::{linklist, man7, manbsd, xsso};
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8 use bitflags::bitflags;
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9 use num_enum::{IntoPrimitive, TryFromPrimitive};
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10 use std::error::Error;
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11 use std::ffi::c_int;
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12 use std::fmt;
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13 use std::fmt::{Display, Formatter};
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14 use std::result::Result as StdResult;
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16 /// Values for constants not provided by certain PAM implementations.
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17 ///
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18 /// **The values of these constants are deliberately selected _not_ to match
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19 /// any PAM implementations. Applications should always use the symbolic value
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20 /// and not a magic number.**
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21 mod pam_ffi {
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22 pub use libpam_sys::*;
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23
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24 macro_rules! define {
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25 ($(#[$attr:meta])* $($name:ident = $value:expr;)+) => {
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26 define!(
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27 @meta { $(#[$attr])* }
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28 $(pub const $name: i32 = $value;)+
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29 );
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30 };
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31 (@meta $m:tt $($i:item)+) => { define!(@expand $($m $i)+); };
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32 (@expand $({ $(#[$m:meta])* } $i:item)+) => {$($(#[$m])* $i)+};
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33 }
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34
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35 define!(
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36 /// A fictitious constant for testing purposes.
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37 #[cfg(not(feature = "link"))]
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38 #[cfg_pam_impl(not("OpenPam"))]
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39 PAM_BAD_CONSTANT = 513;
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40 PAM_BAD_FEATURE = 514;
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41 );
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42
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43 define!(
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44 /// A fictitious constant for testing purposes.
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45 #[cfg(not(feature = "link"))]
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46 #[cfg_pam_impl(not(any("LinuxPam", "OpenPam")))]
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47 PAM_BAD_ITEM = 515;
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48 PAM_MODULE_UNKNOWN = 516;
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49 );
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51 define!(
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52 /// A fictitious constant for testing purposes.
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53 #[cfg(not(feature = "link"))]
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54 #[cfg_pam_impl(not("LinuxPam"))]
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55 PAM_CONV_AGAIN = 517;
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56 PAM_INCOMPLETE = 518;
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57 );
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58 }
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59
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60 bitflags! {
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61 /// The available PAM flags.
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62 ///
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63 /// See `/usr/include/security/_pam_types.h` and
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64 /// See `/usr/include/security/pam_modules.h` for more details.
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65 #[derive(Debug, Default, PartialEq)]
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66 #[repr(transparent)]
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67 pub struct Flags: c_int {
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68 /// The module should not generate any messages.
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69 const SILENT = libpam_sys::PAM_SILENT;
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70
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71 /// The module should return [ErrorCode::AuthError]
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72 /// if the user has an empty authentication token
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73 /// rather than immediately accepting them.
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74 const DISALLOW_NULL_AUTHTOK = libpam_sys::PAM_DISALLOW_NULL_AUTHTOK;
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75
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76 // Flag used for `set_credentials`.
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77
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78 /// Set user credentials for an authentication service.
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79 const ESTABLISH_CREDENTIALS = libpam_sys::PAM_ESTABLISH_CRED;
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80 /// Delete user credentials associated with
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81 /// an authentication service.
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82 const DELETE_CREDENTIALS = libpam_sys::PAM_DELETE_CRED;
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83 /// Reinitialize user credentials.
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84 const REINITIALIZE_CREDENTIALS = libpam_sys::PAM_REINITIALIZE_CRED;
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85 /// Extend the lifetime of user credentials.
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86 const REFRESH_CREDENTIALS = libpam_sys::PAM_REFRESH_CRED;
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87
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88 // Flags used for password changing.
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89
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90 /// The password service should only update those passwords
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91 /// that have aged. If this flag is _not_ passed,
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92 /// the password service should update all passwords.
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93 ///
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94 /// This flag is only used by `change_authtok`.
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95 const CHANGE_EXPIRED_AUTHTOK = libpam_sys::PAM_CHANGE_EXPIRED_AUTHTOK;
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96 /// This is a preliminary check for password changing.
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97 /// The password should not be changed.
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98 ///
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99 /// This is only used between PAM and a module.
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100 /// Applications may not use this flag.
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101 ///
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102 /// This flag is only used by `change_authtok`.
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103 const PRELIMINARY_CHECK = libpam_sys::PAM_PRELIM_CHECK;
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104 /// The password should actuallyPR be updated.
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105 /// This and [Self::PRELIMINARY_CHECK] are mutually exclusive.
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106 ///
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107 /// This is only used between PAM and a module.
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108 /// Applications may not use this flag.
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109 ///
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110 /// This flag is only used by `change_authtok`.
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111 const UPDATE_AUTHTOK = libpam_sys::PAM_UPDATE_AUTHTOK;
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112 }
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113 }
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114
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115 /// The PAM error return codes.
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116 ///
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117 /// These are returned by most PAM functions if an error of some kind occurs.
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118 ///
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119 /// Instead of being an error code, success is represented by an Ok [`Result`].
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120 ///
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121 /// # References
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122 ///
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123 #[doc = linklist!(pam: man7, manbsd)]
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124 /// - [X/SSO error code specification][xsso]
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125 ///
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126 #[doc = man7!(3 pam "RETURN_VALUES")]
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127 #[doc = manbsd!(3 pam "RETURN%20VALUES")]
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128 #[doc = xsso!("chap5.htm#tagcjh_06_02")]
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129 #[allow(non_camel_case_types, dead_code)]
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130 #[derive(Copy, Clone, Debug, PartialEq, TryFromPrimitive, IntoPrimitive)]
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131 #[non_exhaustive] // C might give us anything!
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132 #[repr(i32)]
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133 pub enum ErrorCode {
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134 OpenError = pam_ffi::PAM_OPEN_ERR,
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135 SymbolError = pam_ffi::PAM_SYMBOL_ERR,
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136 ServiceError = pam_ffi::PAM_SERVICE_ERR,
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137 SystemError = pam_ffi::PAM_SYSTEM_ERR,
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138 BufferError = pam_ffi::PAM_BUF_ERR,
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139 PermissionDenied = pam_ffi::PAM_PERM_DENIED,
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140 AuthenticationError = pam_ffi::PAM_AUTH_ERR,
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141 CredentialsInsufficient = pam_ffi::PAM_CRED_INSUFFICIENT,
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142 AuthInfoUnavailable = pam_ffi::PAM_AUTHINFO_UNAVAIL,
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143 UserUnknown = pam_ffi::PAM_USER_UNKNOWN,
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144 MaxTries = pam_ffi::PAM_MAXTRIES,
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145 NewAuthTokRequired = pam_ffi::PAM_NEW_AUTHTOK_REQD,
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146 AccountExpired = pam_ffi::PAM_ACCT_EXPIRED,
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147 SessionError = pam_ffi::PAM_SESSION_ERR,
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148 CredentialsUnavailable = pam_ffi::PAM_CRED_UNAVAIL,
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149 CredentialsExpired = pam_ffi::PAM_CRED_EXPIRED,
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150 CredentialsError = pam_ffi::PAM_CRED_ERR,
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151 NoModuleData = pam_ffi::PAM_NO_MODULE_DATA,
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152 ConversationError = pam_ffi::PAM_CONV_ERR,
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153 AuthTokError = pam_ffi::PAM_AUTHTOK_ERR,
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154 AuthTokRecoveryError = pam_ffi::PAM_AUTHTOK_RECOVERY_ERR,
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155 AuthTokLockBusy = pam_ffi::PAM_AUTHTOK_LOCK_BUSY,
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156 AuthTokDisableAging = pam_ffi::PAM_AUTHTOK_DISABLE_AGING,
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157 TryAgain = pam_ffi::PAM_TRY_AGAIN,
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158 Ignore = pam_ffi::PAM_IGNORE,
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159 Abort = pam_ffi::PAM_ABORT,
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160 AuthTokExpired = pam_ffi::PAM_AUTHTOK_EXPIRED,
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161 #[cfg(feature = "basic-ext")]
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162 ModuleUnknown = pam_ffi::PAM_MODULE_UNKNOWN,
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163 #[cfg(feature = "basic-ext")]
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164 BadItem = pam_ffi::PAM_BAD_ITEM,
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165 #[cfg(feature = "linux-pam-ext")]
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166 ConversationAgain = pam_ffi::PAM_CONV_AGAIN,
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167 #[cfg(feature = "linux-pam-ext")]
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168 Incomplete = pam_ffi::PAM_INCOMPLETE,
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169 }
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170
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171 /// A PAM-specific Result type with an [ErrorCode] error.
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172 pub type Result<T> = StdResult<T, ErrorCode>;
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173
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174 impl Display for ErrorCode {
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175 fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
130
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176 match strerror((*self).into()) {
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177 Some(err) => f.write_str(err),
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178 None => self.fmt_internal(f),
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179 }
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180 }
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181 }
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182
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183 impl Error for ErrorCode {}
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184
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185 impl ErrorCode {
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186 /// Converts this [Result] into a C-compatible result code.
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187 pub fn result_to_c<T>(value: Result<T>) -> c_int {
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188 match value {
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189 Ok(_) => 0, // PAM_SUCCESS
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190 Err(otherwise) => otherwise.into(),
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191 }
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192 }
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193
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194 /// Converts a C result code into a [Result], with success as Ok.
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195 /// Invalid values are returned as a [Self::SystemError].
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196 pub fn result_from(value: c_int) -> Result<()> {
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197 match value {
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198 0 => Ok(()),
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199 value => Err(value.try_into().unwrap_or(Self::SystemError)),
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200 }
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201 }
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202
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203 /// A basic Display implementation for if we don't link against PAM.
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204 fn fmt_internal(self, f: &mut Formatter<'_>) -> fmt::Result {
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205 let n: c_int = self.into();
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206 write!(f, "PAM error: {self:?} ({n})")
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207 }
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208 }
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209
130
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210 /// Gets a string version of an error message.
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211 #[cfg(feature = "link")]
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212 pub fn strerror(code: c_int) -> Option<&'static str> {
131
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213 use std::ffi::CStr;
130
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214 use std::ptr;
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215 // SAFETY: PAM impls don't care about the PAM handle and always return
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216 // static strings.
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217 let strerror = unsafe { libpam_sys::pam_strerror(ptr::null(), code as c_int) };
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218 // SAFETY: We just got this back from PAM and we checked if it's null.
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219 (!strerror.is_null())
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220 .then(|| unsafe { CStr::from_ptr(strerror) }.to_str().ok())
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221 .flatten()
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222 }
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223
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224 /// Dummy implementation of strerror so that it always returns None.
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diff changeset
225 #[cfg(not(feature = "link"))]
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226 pub fn strerror(_: c_int) -> Option<&'static str> {
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227 None
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diff changeset
228 }
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229
59
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diff changeset
230 #[cfg(test)]
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diff changeset
231 mod tests {
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diff changeset
232 use super::*;
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233
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diff changeset
234 #[test]
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diff changeset
235 fn test_enums() {
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diff changeset
236 assert_eq!(Ok(()), ErrorCode::result_from(0));
80
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diff changeset
237 assert_eq!(
108
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diff changeset
238 pam_ffi::PAM_SESSION_ERR as i32,
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diff changeset
239 ErrorCode::result_to_c::<()>(Err(ErrorCode::SessionError))
80
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diff changeset
240 );
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diff changeset
241 assert_eq!(
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diff changeset
242 Err(ErrorCode::Abort),
84
a638a45e5f1f do some real irritating i32/u32 juggling to make bindgen happy
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diff changeset
243 ErrorCode::result_from(pam_ffi::PAM_ABORT as i32)
80
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diff changeset
244 );
59
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diff changeset
245 assert_eq!(Err(ErrorCode::SystemError), ErrorCode::result_from(423));
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diff changeset
246 }
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247 }