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annotate src/constants.rs @ 77:351bdc13005e

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Update the libpam module to work with the new structure.
author Paul Fisher <paul@pfish.zone>
date Sun, 08 Jun 2025 01:03:46 -0400
parents 58f9d2a4df38
children 5aa1a010f1e8
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1 //! Constants and enum values from the PAM library.
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2
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3 use bitflags::bitflags;
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4 use libc::{c_int, c_uint};
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5 use num_derive::FromPrimitive;
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6 use num_traits::FromPrimitive;
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7 use std::any;
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8 use std::marker::PhantomData;
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9 use std::result::Result as StdResult;
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10
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11 bitflags! {
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12 /// The available PAM flags.
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13 ///
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14 /// See `/usr/include/security/_pam_types.h` and
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15 /// See `/usr/include/security/pam_modules.h` for more details.
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16 #[derive(Debug, PartialEq)]
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17 #[repr(transparent)]
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18 pub struct Flags: c_uint {
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19 /// The module should not generate any messages.
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20 const SILENT = 0x8000;
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21
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22 /// The module should return [ErrorCode::AuthError]
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23 /// if the user has an empty authentication token
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24 /// rather than immediately accepting them.
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25 const DISALLOW_NULL_AUTHTOK = 0x0001;
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26
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27 // Flag used for `set_credentials`.
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28
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29 /// Set user credentials for an authentication service.
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30 const ESTABLISH_CREDENTIALS = 0x0002;
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31 /// Delete user credentials associated with
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32 /// an authentication service.
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33 const DELETE_CREDENTIALS = 0x0004;
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34 /// Reinitialize user credentials.
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35 const REINITIALIZE_CREDENTIALS = 0x0008;
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36 /// Extend the lifetime of user credentials.
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37 const REFRESH_CREDENTIALS = 0x0010;
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38
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39 // Flags used for password changing.
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40
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41 /// The password service should only update those passwords
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42 /// that have aged. If this flag is _not_ passed,
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43 /// the password service should update all passwords.
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44 ///
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45 /// This flag is only used by `change_authtok`.
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46 const CHANGE_EXPIRED_AUTHTOK = 0x0020;
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47
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48 /// This is a preliminary check for password changing.
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49 /// The password should not be changed.
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50 ///
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51 /// This is only used between PAM and a module.
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52 /// Applications may not use this flag.
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53 ///
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54 /// This flag is only used by `change_authtok`.
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55 const PRELIMINARY_CHECK = 0x4000;
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56 /// The password should actuallyPR be updated.
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57 /// This and [Self::PRELIMINARY_CHECK] are mutually exclusive.
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58 ///
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59 /// This is only used between PAM and a module.
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60 /// Applications may not use this flag.
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61 ///
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62 /// This flag is only used by `change_authtok`.
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63 const UPDATE_AUTHTOK = 0x2000;
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64 }
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65 }
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66
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67 /// The Linux-PAM error return values. Success is an Ok [Result].
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68 ///
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69 /// Most abbreviations (except `AuthTok` and `Max`) are now full words.
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70 /// For more detailed information, see
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71 /// `/usr/include/security/_pam_types.h`.
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72 #[allow(non_camel_case_types, dead_code)]
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73 #[derive(Copy, Clone, Debug, PartialEq, thiserror::Error, FromPrimitive)]
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74 #[non_exhaustive] // C might give us anything!
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75 pub enum ErrorCode {
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76 #[error("dlopen() failure when dynamically loading a service module")]
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77 OpenError = 1,
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78 #[error("symbol not found")]
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79 SymbolError = 2,
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80 #[error("error in service module")]
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81 ServiceError = 3,
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82 #[error("system error")]
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83 SystemError = 4,
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84 #[error("memory buffer error")]
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85 BufferError = 5,
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86 #[error("permission denied")]
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87 PermissionDenied = 6,
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88 #[error("authentication failure")]
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89 AuthenticationError = 7,
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90 #[error("cannot access authentication data due to insufficient credentials")]
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91 CredentialsInsufficient = 8,
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92 #[error("underlying authentication service cannot retrieve authentication information")]
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93 AuthInfoUnavailable = 9,
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94 #[error("user not known to the underlying authentication module")]
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95 UserUnknown = 10,
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96 #[error("retry limit reached; do not attempt further")]
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97 MaxTries = 11,
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98 #[error("new authentication token required")]
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99 NewAuthTokRequired = 12,
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100 #[error("user account has expired")]
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101 AccountExpired = 13,
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102 #[error("cannot make/remove an entry for the specified session")]
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103 SessionError = 14,
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104 #[error("underlying authentication service cannot retrieve user credentials")]
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105 CredentialsUnavailable = 15,
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106 #[error("user credentials expired")]
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107 CredentialsExpired = 16,
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108 #[error("failure setting user credentials")]
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109 CredentialsError = 17,
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110 #[error("no module-specific data is present")]
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111 NoModuleData = 18,
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112 #[error("conversation error")]
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113 ConversationError = 19,
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114 #[error("authentication token manipulation error")]
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115 AuthTokError = 20,
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116 #[error("authentication information cannot be recovered")]
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117 AuthTokRecoveryError = 21,
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118 #[error("authentication token lock busy")]
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119 AuthTokLockBusy = 22,
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120 #[error("authentication token aging disabled")]
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121 AuthTokDisableAging = 23,
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122 #[error("preliminary password check failed")]
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123 TryAgain = 24,
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124 #[error("ignore underlying account module, regardless of control flag")]
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125 Ignore = 25,
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126 #[error("critical error; this module should fail now")]
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127 Abort = 26,
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128 #[error("authentication token has expired")]
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129 AuthTokExpired = 27,
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130 #[error("module is not known")]
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131 ModuleUnknown = 28,
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132 #[error("bad item passed to pam_[whatever]_item")]
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133 BadItem = 29,
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134 #[error("conversation function is event-driven and data is not available yet")]
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135 ConversationAgain = 30,
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136 #[error("call this function again to complete authentication stack")]
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137 Incomplete = 31,
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138 }
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139
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140 /// A PAM-specific Result type with an [ErrorCode] error.
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141 pub type Result<T> = StdResult<T, ErrorCode>;
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142
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143 impl ErrorCode {
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144 /// Converts this [Result] into a C-compatible result code.
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145 pub fn result_to_c<T>(value: Result<T>) -> c_int {
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146 match value {
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147 Ok(_) => 0, // PAM_SUCCESS
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148 Err(otherwise) => otherwise.into(),
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149 }
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150 }
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151
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152 /// Converts a C result code into a [Result], with success as Ok.
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153 /// Invalid values are returned as a [Self::SystemError].
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154 pub fn result_from(value: c_int) -> Result<()> {
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155 match value {
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156 0 => Ok(()),
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157 value => Err(value.try_into().unwrap_or(Self::SystemError)),
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158 }
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159 }
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160 }
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161
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162 impl TryFrom<c_int> for ErrorCode {
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163 type Error = InvalidEnum<Self>;
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164
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165 fn try_from(value: c_int) -> StdResult<Self, Self::Error> {
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166 Self::from_i32(value).ok_or(value.into())
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167 }
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168 }
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169
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170 impl From<ErrorCode> for c_int {
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171 fn from(val: ErrorCode) -> Self {
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172 val as Self
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173 }
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174 }
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175
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176 /// Error returned when attempting to coerce an invalid C integer into an enum.
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177 #[derive(Debug, PartialEq, thiserror::Error)]
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178 #[error("{0} is not a valid {type}", type = any::type_name::<T>())]
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179 pub struct InvalidEnum<T>(c_int, PhantomData<T>);
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180
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181 impl<T> From<InvalidEnum<T>> for c_int {
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182 fn from(value: InvalidEnum<T>) -> Self {
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183 value.0
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184 }
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185 }
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186
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187 impl<T> From<c_int> for InvalidEnum<T> {
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188 fn from(value: c_int) -> Self {
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189 Self(value, PhantomData)
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190 }
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191 }
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192
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193 /// Returned when text that should not have any `\0` bytes in it does.
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194 /// Analogous to [`std::ffi::NulError`], but the data it was created from
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195 /// is borrowed.
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196 #[cfg(test)]
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197 mod tests {
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198 use super::*;
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199
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200 #[test]
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201 fn test_enums() {
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202 assert_eq!(Ok(ErrorCode::ServiceError), 3.try_into());
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203 assert_eq!(Err(InvalidEnum::from(999)), ErrorCode::try_from(999));
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204 assert_eq!(Ok(()), ErrorCode::result_from(0));
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205 assert_eq!(Err(ErrorCode::Abort), ErrorCode::result_from(26));
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206 assert_eq!(Err(ErrorCode::SystemError), ErrorCode::result_from(423));
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207 assert!(InvalidEnum::<ErrorCode>(33, PhantomData)
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208 .to_string()
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209 .starts_with("33 is not a valid "));
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210 }
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211 }