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annotate src/constants.rs @ 170:f052e2417195

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Completely avoid using libpam_sys if we're not actually linking.
author Paul Fisher <paul@pfish.zone>
date Wed, 16 Jul 2025 18:45:20 -0400
parents 2f5913131295
children e27c5c667a5a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
60
05cc2c27334f The Big Refactor: clean up docs and exports.
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1 //! Constants and enum values from the PAM library.
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2
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1bc52025156b Split PAM items into their own separate struct.
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3 use crate::_doc::{linklist, man7, manbsd, xsso};
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daa2cde64601 Big big refactor. Probably should have been multiple changes.
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4 use bitflags::bitflags;
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5aa1a010f1e8 Start using PAM headers; improve owned/borrowed distinction.
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5 use num_enum::{IntoPrimitive, TryFromPrimitive};
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f6186e41399b Miscellaneous fixes and cleanup:
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6 use std::error::Error;
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a632a8874131 Get all the Linux-PAM functions into libpam-sys, and get tests right.
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7 use std::ffi::c_int;
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8 use std::fmt;
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f6186e41399b Miscellaneous fixes and cleanup:
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9 use std::fmt::{Display, Formatter};
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58f9d2a4df38 Reorganize everything again???
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10 use std::result::Result as StdResult;
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27730595f1ea Adding pam-http module
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11
170
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12 #[cfg(features = "link")]
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13 use libpam_sys_consts::constants as pam_constants;
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14
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15
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16 /// The union of constants available in all versions of PAM.
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17 /// The values here are fictitious and should not be used.
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18 #[cfg(not(features = "link"))]
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19 mod pam_constants {
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20 pub const PAM_SUCCESS: i32 = 0;
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21
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22 /// Generates a sequence of values.
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23 macro_rules! c_enum {
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24 ($first:ident = $value:expr, $($rest:ident,)*) => {
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25 c_enum!(($value) $first, $($rest,)*);
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26 };
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27 (($value:expr) $first:ident, $($rest:ident,)*) => {
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28 pub const $first: i32 = $value;
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29 c_enum!(($value+1) $($rest,)*);
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30 };
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31 (($value:expr)) => {};
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32 }
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33
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34 // Since all these values are fictitious, we can start them wherever.
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35 // All the items.
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36 c_enum!(
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37 PAM_SERVICE = 64,
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38 PAM_USER,
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39 PAM_TTY,
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40 PAM_RHOST,
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41 PAM_CONV,
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42 PAM_AUTHTOK,
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43 PAM_OLDAUTHTOK,
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44 PAM_RUSER,
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45 PAM_USER_PROMPT,
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46 // Linux-only items.
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47 PAM_FAIL_DELAY,
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48 PAM_XDISPLAY,
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49 PAM_XAUTHDATA,
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50 PAM_AUTHTOK_TYPE,
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51 // OpenPAM-only items.
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52 PAM_REPOSITORY,
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53 PAM_AUTHTOK_PROMPT,
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54 PAM_OLDAUTHTOK_PROMPT,
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55 PAM_HOST,
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56 // Sun-only items.
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57 PAM_RESOURCE,
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58 PAM_AUSER,
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59 );
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60
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61 // Prompt types.
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62 c_enum!(
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63 PAM_PROMPT_ECHO_OFF = 96,
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64 PAM_PROMPT_ECHO_ON,
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65 PAM_ERROR_MSG,
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66 PAM_TEXT_INFO,
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67 PAM_RADIO_TYPE,
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68 PAM_BINARY_PROMPT,
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69 );
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70
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71 // Errors.
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72 c_enum!(
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73 PAM_OPEN_ERR = 128,
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74 PAM_SYMBOL_ERR,
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75 PAM_SERVICE_ERR,
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76 PAM_SYSTEM_ERR,
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77 PAM_BUF_ERR,
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78 PAM_PERM_DENIED,
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79 PAM_AUTH_ERR,
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80 PAM_CRED_INSUFFICIENT,
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81 PAM_AUTHINFO_UNAVAIL,
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82 PAM_USER_UNKNOWN,
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83 PAM_MAXTRIES,
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84 PAM_NEW_AUTHTOK_REQD,
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85 PAM_ACCT_EXPIRED,
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86 PAM_SESSION_ERR,
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87 PAM_CRED_UNAVAIL,
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88 PAM_CRED_EXPIRED,
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89 PAM_CRED_ERR,
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90 PAM_NO_MODULE_DATA,
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91 PAM_CONV_ERR,
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92 PAM_AUTHTOK_ERR,
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93 PAM_AUTHTOK_RECOVERY_ERR,
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94 PAM_AUTHTOK_LOCK_BUSY,
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95 PAM_AUTHTOK_DISABLE_AGING,
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96 PAM_TRY_AGAIN,
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97 PAM_IGNORE,
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98 PAM_ABORT,
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99 PAM_AUTHTOK_EXPIRED,
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100 PAM_MODULE_UNKNOWN,
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101 PAM_BAD_ITEM,
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102 PAM_CONV_AGAIN,
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103 PAM_INCOMPLETE,
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104 // OpenPAM-only errors.
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105 PAM_DOMAIN_UNKNOWN,
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106 PAM_BAD_HANDLE,
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107 PAM_BAD_FEATURE,
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108 PAM_BAD_CONSTANT,
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109 );
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110
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111 macro_rules! flag_enum {
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112 ($first:ident = $value:expr, $($rest:ident,)*) => {
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113 flag_enum!(($value) $first, $($rest,)*);
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114 };
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115 (($value:expr) $first:ident, $($rest:ident,)*) => {
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116 pub const $first: i32 = $value;
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117 flag_enum!(($value*2) $($rest,)*);
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118 };
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119 (($value:expr)) => {};
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120 }
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121
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122 flag_enum!(
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123 PAM_SILENT = 256,
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124 PAM_DISALLOW_NULL_AUTHTOK,
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125 PAM_ESTABLISH_CRED,
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126 PAM_DELETE_CRED,
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127 PAM_REINITIALIZE_CRED,
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128 PAM_REFRESH_CRED,
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129
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130 PAM_CHANGE_EXPIRED_AUTHTOK,
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131
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132 PAM_PRELIM_CHECK,
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133 PAM_UPDATE_AUTHTOK,
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134 PAM_DATA_REPLACE,
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135 PAM_DATA_SILENT,
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136 );
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137 }
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138
166
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139 /// Creates a bitflags! macro, with an extra SILENT element.
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140 macro_rules! pam_flags {
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141 (
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142 $(#[$m:meta])*
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143 $name:ident {
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144 $($inner:tt)*
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145 }
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146 ) => {
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147 bitflags! {
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148 $(#[$m])*
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149 #[derive(Clone, Copy, Debug, Default, PartialEq)]
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150 #[repr(transparent)]
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151 pub struct $name: c_int {
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152 /// The module should not generate any messages.
170
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153 const SILENT = pam_constants::PAM_SILENT;
166
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154 $($inner)*
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155 }
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156 }
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157 }
166
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158 }
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159
166
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160 pam_flags! {
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161 /// Flags for authentication and account management.
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162 AuthnFlags {
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163 /// The module should return [AuthError](ErrorCode::AuthError)
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164 /// if the user has an empty authentication token, rather than
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165 /// allowing them to log in.
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166 const DISALLOW_NULL_AUTHTOK = pam_constants::PAM_DISALLOW_NULL_AUTHTOK;
166
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167 }
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168 }
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169
166
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170 pam_flags! {
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171 /// Flags for changing the authentication token.
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172 AuthtokFlags {
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173 /// Indicates that the user's authentication token should
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174 /// only be changed if it is expired. If not passed,
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175 /// the authentication token should be changed unconditionally.
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176 const CHANGE_EXPIRED_AUTHTOK = pam_constants::PAM_CHANGE_EXPIRED_AUTHTOK;
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177
166
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178 /// Don't check if the password is any good (Sun only).
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179 #[cfg(pam_impl = "Sun")]
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180 const NO_AUTHTOK_CHECK = pam_constants::PAM_NO_AUTHTOK_CHECK;
166
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181 }
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182 }
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183
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184 pam_flags! {
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185 /// Common flag(s) shared by all PAM actions.
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186 BaseFlags {}
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187 }
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188
166
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189 #[cfg(feature = "openpam-ext")]
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190 const BAD_CONST: ErrorCode = ErrorCode::BadConstant;
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191 #[cfg(not(feature = "openpam-ext"))]
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192 const BAD_CONST: ErrorCode = ErrorCode::SystemError;
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193
166
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194 macro_rules! flag_enum {
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195 (
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196 $(#[$m:meta])*
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197 $name:ident {
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198 $(
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199 $(#[$item_m:meta])*
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200 $item_name:ident = $item_value:expr,
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201 )*
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202 }
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203 ) => {
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204 $(#[$m])*
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205 #[derive(Clone, Copy, Debug, PartialEq, TryFromPrimitive, IntoPrimitive)]
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206 #[repr(i32)]
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207 pub enum $name {
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208 $(
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209 $(#[$item_m])*
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210 $item_name = $item_value,
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211 )*
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212 }
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213
166
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214 impl $name {
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215 const ALL_VALUES: i32 = 0 $( | $item_value)*;
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216
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217 fn split(value: i32) -> Result<(Option<Self>, i32)> {
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218 let me = value & Self::ALL_VALUES;
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219 let them = value & !Self::ALL_VALUES;
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220 let me = match me {
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221 0 => None,
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222 n => Some(Self::try_from(n).map_err(|_| BAD_CONST)?),
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223 };
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224 Ok((me, them))
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225 }
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226 }
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227 }
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228 }
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229
166
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230 flag_enum! {
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231 /// The credential management action that should take place.
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232 CredAction {
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233 /// Set the user's credentials from this module. Default if unspecified.
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diff changeset
234 Establish = pam_constants::PAM_ESTABLISH_CRED,
166
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235 /// Revoke the user's credentials established by this module.
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diff changeset
236 Delete = pam_constants::PAM_DELETE_CRED,
166
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237 /// Fully reinitialize the user's credentials from this module.
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diff changeset
238 Reinitialize = pam_constants::PAM_REINITIALIZE_CRED,
166
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diff changeset
239 /// Extend the lifetime of the user's credentials from this module.
170
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diff changeset
240 Refresh = pam_constants::PAM_REFRESH_CRED,
166
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241 }
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242 }
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243
166
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244 impl CredAction {
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245 /// Separates this enum from the remaining [`BaseFlags`].
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246 pub fn extract(value: i32) -> Result<(Self, BaseFlags)> {
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diff changeset
247 Self::split(value)
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248 .map(|(act, rest)| (act.unwrap_or_default(), BaseFlags::from_bits_retain(rest)))
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249 }
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250 }
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251
166
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252 impl Default for CredAction {
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diff changeset
253 fn default() -> Self {
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diff changeset
254 Self::Establish
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255 }
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256 }
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257
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diff changeset
258 flag_enum! {
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diff changeset
259 AuthtokAction {
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260 /// This is a preliminary call to check if we're ready to change passwords
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261 /// and that the new password is acceptable.
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diff changeset
262 PreliminaryCheck = pam_constants::PAM_PRELIM_CHECK,
166
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diff changeset
263 /// You should actually update the password.
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diff changeset
264 Update = pam_constants::PAM_UPDATE_AUTHTOK,
166
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265 }
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266 }
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267
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diff changeset
268 impl AuthtokAction {
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269 /// Separates this enum from the remaining [`AuthtokFlags`].
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diff changeset
270 pub fn extract(value: i32) -> Result<(Self, AuthtokFlags)> {
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diff changeset
271 match Self::split(value)? {
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diff changeset
272 (Some(act), rest) => Ok((act, AuthtokFlags::from_bits_retain(rest))),
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diff changeset
273 (None, _) => Err(BAD_CONST),
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274 }
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275 }
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276 }
15
27730595f1ea Adding pam-http module
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parents:
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277
103
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278 /// The PAM error return codes.
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279 ///
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280 /// These are returned by most PAM functions if an error of some kind occurs.
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281 ///
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282 /// Instead of being an error code, success is represented by an Ok [`Result`].
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283 ///
103
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284 /// # References
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285 ///
116
a12706e42c9d Logging, macros, and building:
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286 #[doc = linklist!(pam: man7, manbsd)]
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287 /// - [X/SSO error code specification][xsso]
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288 ///
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289 #[doc = man7!(3 pam "RETURN_VALUES")]
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290 #[doc = manbsd!(3 pam "RETURN%20VALUES")]
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291 #[doc = xsso!("chap5.htm#tagcjh_06_02")]
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292 #[allow(non_camel_case_types, dead_code)]
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293 #[derive(Copy, Clone, Debug, PartialEq, TryFromPrimitive, IntoPrimitive)]
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294 #[non_exhaustive] // C might give us anything!
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295 #[repr(i32)]
56
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296 pub enum ErrorCode {
170
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297 OpenError = pam_constants::PAM_OPEN_ERR,
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298 SymbolError = pam_constants::PAM_SYMBOL_ERR,
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299 ServiceError = pam_constants::PAM_SERVICE_ERR,
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300 SystemError = pam_constants::PAM_SYSTEM_ERR,
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301 BufferError = pam_constants::PAM_BUF_ERR,
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302 PermissionDenied = pam_constants::PAM_PERM_DENIED,
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303 AuthenticationError = pam_constants::PAM_AUTH_ERR,
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304 CredentialsInsufficient = pam_constants::PAM_CRED_INSUFFICIENT,
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305 AuthInfoUnavailable = pam_constants::PAM_AUTHINFO_UNAVAIL,
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306 UserUnknown = pam_constants::PAM_USER_UNKNOWN,
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307 MaxTries = pam_constants::PAM_MAXTRIES,
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308 NewAuthTokRequired = pam_constants::PAM_NEW_AUTHTOK_REQD,
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309 AccountExpired = pam_constants::PAM_ACCT_EXPIRED,
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310 SessionError = pam_constants::PAM_SESSION_ERR,
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311 CredentialsUnavailable = pam_constants::PAM_CRED_UNAVAIL,
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312 CredentialsExpired = pam_constants::PAM_CRED_EXPIRED,
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313 CredentialsError = pam_constants::PAM_CRED_ERR,
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314 NoModuleData = pam_constants::PAM_NO_MODULE_DATA,
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315 ConversationError = pam_constants::PAM_CONV_ERR,
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316 AuthTokError = pam_constants::PAM_AUTHTOK_ERR,
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317 AuthTokRecoveryError = pam_constants::PAM_AUTHTOK_RECOVERY_ERR,
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318 AuthTokLockBusy = pam_constants::PAM_AUTHTOK_LOCK_BUSY,
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319 AuthTokDisableAging = pam_constants::PAM_AUTHTOK_DISABLE_AGING,
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320 TryAgain = pam_constants::PAM_TRY_AGAIN,
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321 Ignore = pam_constants::PAM_IGNORE,
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322 Abort = pam_constants::PAM_ABORT,
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323 AuthTokExpired = pam_constants::PAM_AUTHTOK_EXPIRED,
108
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324 #[cfg(feature = "basic-ext")]
170
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325 ModuleUnknown = pam_constants::PAM_MODULE_UNKNOWN,
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326 #[cfg(feature = "basic-ext")]
170
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327 BadItem = pam_constants::PAM_BAD_ITEM,
166
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328 #[cfg(feature = "linux-pam-ext")]
170
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329 ConversationAgain = pam_constants::PAM_CONV_AGAIN,
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330 #[cfg(feature = "linux-pam-ext")]
170
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331 Incomplete = pam_constants::PAM_INCOMPLETE,
166
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332 #[cfg(feature = "openpam-ext")]
170
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333 DomainUnknown = pam_constants::PAM_DOMAIN_UNKNOWN,
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334 #[cfg(feature = "openpam-ext")]
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335 BadHandle = pam_constants::PAM_BAD_HANDLE,
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336 #[cfg(feature = "openpam-ext")]
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337 BadFeature = pam_constants::PAM_BAD_FEATURE,
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338 #[cfg(feature = "openpam-ext")]
170
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339 BadConstant = pam_constants::PAM_BAD_CONSTANT,
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340 }
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341
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342 /// A PAM-specific Result type with an [ErrorCode] error.
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343 pub type Result<T> = StdResult<T, ErrorCode>;
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344
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345 impl Display for ErrorCode {
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346 fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
130
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347 match strerror((*self).into()) {
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348 Some(err) => f.write_str(err),
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349 None => self.fmt_internal(f),
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350 }
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351 }
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352 }
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353
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354 impl Error for ErrorCode {}
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355
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356 impl ErrorCode {
60
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357 /// Converts this [Result] into a C-compatible result code.
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358 pub fn result_to_c<T>(value: Result<T>) -> c_int {
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359 match value {
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360 Ok(_) => 0, // PAM_SUCCESS
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361 Err(otherwise) => otherwise.into(),
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362 }
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363 }
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364
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365 /// Converts a C result code into a [Result], with success as Ok.
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366 /// Invalid values are returned as a [Self::SystemError].
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367 pub fn result_from(value: c_int) -> Result<()> {
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368 match value {
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369 0 => Ok(()),
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370 value => Err(value.try_into().unwrap_or(Self::SystemError)),
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371 }
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372 }
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373
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374 /// A basic Display implementation for if we don't link against PAM.
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375 fn fmt_internal(self, f: &mut Formatter<'_>) -> fmt::Result {
131
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376 let n: c_int = self.into();
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377 write!(f, "PAM error: {self:?} ({n})")
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378 }
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379 }
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380
130
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381 /// Gets a string version of an error message.
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382 #[cfg(feature = "link")]
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383 pub fn strerror(code: c_int) -> Option<&'static str> {
131
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diff changeset
384 use std::ffi::CStr;
130
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385 use std::ptr;
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386 // SAFETY: PAM impls don't care about the PAM handle and always return
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387 // static strings.
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388 let strerror = unsafe { libpam_sys::pam_strerror(ptr::null(), code as c_int) };
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389 // SAFETY: We just got this back from PAM and we checked if it's null.
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390 (!strerror.is_null())
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391 .then(|| unsafe { CStr::from_ptr(strerror) }.to_str().ok())
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392 .flatten()
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393 }
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394
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395 /// Dummy implementation of strerror so that it always returns None.
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396 #[cfg(not(feature = "link"))]
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397 pub fn strerror(_: c_int) -> Option<&'static str> {
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398 None
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399 }
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diff changeset
400
59
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diff changeset
401 #[cfg(test)]
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diff changeset
402 mod tests {
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diff changeset
403 use super::*;
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diff changeset
404
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diff changeset
405 #[test]
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diff changeset
406 fn test_enums() {
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diff changeset
407 assert_eq!(Ok(()), ErrorCode::result_from(0));
80
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diff changeset
408 assert_eq!(
170
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diff changeset
409 pam_constants::PAM_SESSION_ERR,
108
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diff changeset
410 ErrorCode::result_to_c::<()>(Err(ErrorCode::SessionError))
80
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diff changeset
411 );
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diff changeset
412 assert_eq!(
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413 Err(ErrorCode::Abort),
170
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diff changeset
414 ErrorCode::result_from(pam_constants::PAM_ABORT)
80
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diff changeset
415 );
59
3f4a77aa88be Fix string copyting and improve error situation.
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diff changeset
416 assert_eq!(Err(ErrorCode::SystemError), ErrorCode::result_from(423));
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417 }
166
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418
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diff changeset
419 #[test]
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420 fn test_flag_enums() {
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diff changeset
421 AuthtokAction::extract(-1).expect_err("too many set");
2f5913131295 Separate flag/action flags into flags and action.
Paul Fisher <paul@pfish.zone>
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422 AuthtokAction::extract(0).expect_err("too few set");
2f5913131295 Separate flag/action flags into flags and action.
Paul Fisher <paul@pfish.zone>
parents: 148
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423 assert_eq!(
2f5913131295 Separate flag/action flags into flags and action.
Paul Fisher <paul@pfish.zone>
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424 Ok((
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Paul Fisher <paul@pfish.zone>
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425 AuthtokAction::Update,
170
f052e2417195 Completely avoid using libpam_sys if we're not actually linking.
Paul Fisher <paul@pfish.zone>
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426 AuthtokFlags::from_bits_retain(0x7f000000)
166
2f5913131295 Separate flag/action flags into flags and action.
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parents: 148
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427 )),
170
f052e2417195 Completely avoid using libpam_sys if we're not actually linking.
Paul Fisher <paul@pfish.zone>
parents: 166
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428 AuthtokAction::extract(0x7f000000 | pam_constants::PAM_UPDATE_AUTHTOK)
166
2f5913131295 Separate flag/action flags into flags and action.
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parents: 148
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429 );
2f5913131295 Separate flag/action flags into flags and action.
Paul Fisher <paul@pfish.zone>
parents: 148
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430 CredAction::extract(0xffff).expect_err("too many set");
2f5913131295 Separate flag/action flags into flags and action.
Paul Fisher <paul@pfish.zone>
parents: 148
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431 assert_eq!(
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Paul Fisher <paul@pfish.zone>
parents: 148
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432 Ok((CredAction::Establish, BaseFlags::empty())),
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Paul Fisher <paul@pfish.zone>
parents: 148
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433 CredAction::extract(0)
2f5913131295 Separate flag/action flags into flags and action.
Paul Fisher <paul@pfish.zone>
parents: 148
diff changeset
434 );
2f5913131295 Separate flag/action flags into flags and action.
Paul Fisher <paul@pfish.zone>
parents: 148
diff changeset
435 assert_eq!(
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Paul Fisher <paul@pfish.zone>
parents: 148
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436 Ok((CredAction::Delete, BaseFlags::from_bits_retain(0x55000000))),
170
f052e2417195 Completely avoid using libpam_sys if we're not actually linking.
Paul Fisher <paul@pfish.zone>
parents: 166
diff changeset
437 CredAction::extract(0x55000000 | pam_constants::PAM_DELETE_CRED)
166
2f5913131295 Separate flag/action flags into flags and action.
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parents: 148
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438 );
2f5913131295 Separate flag/action flags into flags and action.
Paul Fisher <paul@pfish.zone>
parents: 148
diff changeset
439 }
59
3f4a77aa88be Fix string copyting and improve error situation.
Paul Fisher <paul@pfish.zone>
parents: 56
diff changeset
440 }