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annotate src/handle.rs @ 148:4b3a5095f68c

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Move libpam-sys helpers into their own library. - Renames libpam-sys-helpers to libpam-sys-consts. - Moves libpam-sys-helpers::helpers into libpam-sys-helpers, which moves them completely out of libpam-sys's dependency chain. - Moves the aliases from libpam-sys into libpam-sys::aliases.
author Paul Fisher <paul@pfish.zone>
date Mon, 07 Jul 2025 12:11:43 -0400
parents 1bc52025156b
children 3036f2e6a022
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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a674799a5cd3 Make `PamHandle` and `PamModuleHandle` traits.
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1 //! The wrapper types and traits for handles into the PAM library.
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2
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3 use crate::_doc::{guide, linklist, man7, manbsd, stdlinks};
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4 use crate::constants::{Flags, Result};
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5 use crate::conv::Conversation;
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6 use crate::environ::{EnvironMap, EnvironMapMut};
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7 use crate::items::{getter, Items, ItemsMut};
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8 use crate::logging::{Level, Location};
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9 use std::ffi::{OsStr, OsString};
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10
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11 /// Functionality for both PAM applications and PAM modules.
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12 ///
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13 /// This base trait includes features of a PAM handle that are available
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14 /// to both applications and modules.
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15 ///
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16 /// You probably want [`LibPamTransaction`](crate::libpam::LibPamTransaction).
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17 /// This trait is intended to allow creating mock PAM handle types
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18 /// to test PAM modules and applications.
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19 pub trait PamShared {
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20 /// Logs something via this PAM handle.
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21 ///
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22 /// You probably want to use one of the logging macros,
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23 /// like [`error!`](crate::error!),
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24 /// [`warn!`](crate::warn!),
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25 /// [`info!`](crate::info!),
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26 /// or [`debug!`](crate::debug!).
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27 ///
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28 /// In most PAM implementations, this will go to syslog.
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29 /// See [Linux-PAM's `pam_syslog`][man7] or
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30 /// [OpenPAM's `openpam_log`][manbsd] for more details.
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31 ///
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32 /// # Example
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33 ///
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34 /// ```no_run
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35 /// # use nonstick::PamShared;
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36 /// use nonstick::logging::Level;
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37 /// use nonstick::location;
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38 /// # fn _test(pam_hdl: impl PamShared) {
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39 /// # let delay_ms = 100;
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40 /// # let url = "https://zombo.com";
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41 /// // Usually, instead of calling this manually, just use the macros.
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42 /// nonstick::error!(pam_hdl, "something bad happened!");
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43 /// nonstick::warn!(pam_hdl, "loading information took {delay_ms} ms");
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44 /// nonstick::info!(pam_hdl, "using network backend");
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45 /// nonstick::debug!(pam_hdl, "sending GET request to {url}");
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46 /// // But if you really want to, you can call this yourself:
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47 /// pam_hdl.log(Level::Warning, location!(), "this is unnecessarily verbose");
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48 /// # }
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49 /// ```
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50 #[doc = man7!(3 pam_syslog)]
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51 #[doc = manbsd!(3 openpam_log)]
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52 fn log(&self, level: Level, loc: Location<'_>, entry: &str);
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53
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54 /// Retrieves the name of the user who is authenticating or logging in.
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55 ///
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56 /// If the username has previously been obtained, this uses that username;
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57 /// otherwise it prompts the user with the first of these that is present:
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58 ///
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59 /// 1. The prompt string passed to this function.
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60 /// 2. The string returned by `get_user_prompt_item`.
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61 /// 3. The default prompt, `login: `.
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62 ///
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63 /// # References
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64 #[doc = linklist!(pam_get_user: mwg, _std)]
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65 ///
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66 /// # Example
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67 ///
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68 /// ```no_run
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69 /// # use nonstick::PamShared;
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70 /// # fn _doc(handle: &mut impl PamShared) -> Result<(), Box<dyn std::error::Error>> {
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71 /// // Get the username using the default prompt.
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72 /// let user = handle.username(None)?;
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73 /// // Get the username using a custom prompt.
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74 /// // If this were actually called right after the above,
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75 /// // both user and user_2 would have the same value.
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76 /// let user_2 = handle.username(Some("who ARE you even???".as_ref()))?;
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77 /// # Ok(())
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78 /// # }
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79 /// ```
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80 #[doc = stdlinks!(3 pam_get_user)]
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81 #[doc = guide!(mwg: "mwg-expected-by-module-item.html#mwg-pam_get_user")]
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82 fn username(&mut self, prompt: Option<&OsStr>) -> Result<OsString>;
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83
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84 /// The contents of the environment to set for the logged-in user.
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85 ///
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86 /// # References
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87 ///
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88 #[doc = linklist!(pam_getenv: adg, mwg, _std)]
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89 ///
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90 #[doc = stdlinks!(3 pam_getenv)]
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91 #[doc = guide!(adg: "adg-interface-by-app-expected.html#adg-pam_getenv")]
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92 #[doc = guide!(mwg: "mwg-expected-by-module-item.html#adg-pam_getenv")]
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93 fn environ(&self) -> impl EnvironMap;
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94
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95 /// A writable map of the environment to set for the logged-in user.
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96 ///
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97 /// # References
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98 ///
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99 #[doc = linklist!(pam_putenv: adg, mwg, _std)]
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100 ///
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101 #[doc = stdlinks!(3 pam_putenv)]
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102 #[doc = guide!(adg: "adg-interface-by-app-expected.html#adg-pam_putenv")]
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103 #[doc = guide!(mwg: "mwg-expected-by-module-item.html#adg-pam_putenv")]
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104 fn environ_mut(&mut self) -> impl EnvironMapMut;
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105
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106 /// Gets Items, data shared by PAM, the application, and modules.
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107 ///
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108 /// Certain Items should not be accessed by a PAM application;
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109 /// those are available directly on [`ModuleClient`] for use
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110 /// by PAM modules only.
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111 ///
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112 /// # References
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113 ///
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114 #[doc = linklist!(pam_get_item: mwg, adg, _std)]
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115 ///
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116 #[doc = guide!(adg: "adg-interface-by-app-expected.html#adg-pam_get_item")]
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117 #[doc = guide!(mwg: "mwg-expected-by-module-item.html#mwg-pam_get_item")]
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118 #[doc = stdlinks!(3 pam_get_item)]
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119 fn items(&self) -> impl Items;
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120
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121 /// Read-write access to PAM Items.
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122 ///
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123 /// # References
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124 ///
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125 #[doc = linklist!(pam_set_item: mwg, adg, _std)]
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126 ///
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127 #[doc = guide!(adg: "adg-interface-by-app-expected.html#adg-pam_set_item")]
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128 #[doc = guide!(mwg: "mwg-expected-by-module-item.html#mwg-pam_set_item")]
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129 #[doc = stdlinks!(3 pam_set_item)]
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130 fn items_mut(&mut self) -> impl ItemsMut;
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131 }
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132
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133 /// Functionality of a PAM handle that can be expected by a PAM application.
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134 ///
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135 /// If you are not writing a PAM client application (e.g., you are writing
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136 /// a module), you should not use the functionality exposed by this trait.
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137 ///
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138 /// Like [`PamShared`], this is intended to allow creating mock implementations
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139 /// of PAM for testing PAM applications.
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140 pub trait Transaction: PamShared {
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141 /// Starts the authentication process for the user.
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142 ///
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143 /// The application calls this to find out who the user is, and verify that
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144 /// they are really that person. If authentication is successful,
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145 /// this will return an `Ok(())` [`Result`].
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146 ///
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147 /// A PAM module may change the caller's [username](PamShared::username)
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148 /// as part of the login process, so be sure to check it after making
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149 /// any PAM application call.
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150 ///
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151 /// # References
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152 #[doc = linklist!(pam_authenticate: adg, _std)]
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153 ///
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154 #[doc = guide!(adg: "adg-interface-by-app-expected.html#adg-pam_authenticate")]
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155 #[doc = stdlinks!(3 pam_authenticate)]
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156 fn authenticate(&mut self, flags: Flags) -> Result<()>;
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157
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158 /// Verifies the validity of the user's account (and other stuff).
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159 ///
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160 /// After [authentication](Self::authenticate), an application should call
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161 /// this to ensure that the user's account is still valid. This may check
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162 /// for token expiration or that the user's account is not locked.
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163 ///
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164 /// # References
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165 #[doc = linklist!(pam_acct_mgmt: adg, _std)]
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166 ///
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167 #[doc = guide!(adg: "adg-interface-by-app-expected.html#adg-pam_acct_mgmt")]
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168 #[doc = stdlinks!(3 pam_acct_mgmt)]
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169 fn account_management(&mut self, flags: Flags) -> Result<()>;
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170
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171 /// Changes the authentication token.
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172 ///
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173 /// # References
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174 #[doc = linklist!(pam_chauthtok: adg, _std)]
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175 ///
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176 #[doc = guide!(adg: "adg-interface-by-app-expected.html#adg-pam_chauthtok")]
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177 #[doc = stdlinks!(3 pam_chauthtok)]
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178 fn change_authtok(&mut self, flags: Flags) -> Result<()>;
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179 }
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180
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181 /// Functionality of a PAM handle that can be expected by a PAM module.
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182 ///
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183 /// If you are not writing a PAM module (e.g., you are writing an application),
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184 /// you should not use any of the functionality exposed by this trait.
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185 ///
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186 /// Like [`PamShared`], this is intended to allow creating mock implementations
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187 /// of PAM for testing PAM modules.
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188 pub trait ModuleClient: Conversation + PamShared {
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189 /// Retrieves the authentication token from the user.
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190 ///
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191 /// This should only be used by *authentication* and *password-change*
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192 /// PAM modules.
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193 ///
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194 /// # References
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195 ///
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196 #[doc = linklist!(pam_get_authtok: man7, manbsd)]
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197 ///
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198 /// # Example
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199 ///
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200 /// ```no_run
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201 /// # use nonstick::handle::ModuleClient;
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202 /// # fn _doc(handle: &mut impl ModuleClient) -> Result<(), Box<dyn std::error::Error>> {
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203 /// // Get the user's password using the default prompt.
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204 /// let pass = handle.authtok(None)?;
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205 /// // Get the user's password using a custom prompt.
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206 /// let pass = handle.authtok(Some("Reveal your secrets!".as_ref()))?;
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207 /// Ok(())
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208 /// # }
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209 /// ```
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210 #[doc = man7!(3 pam_get_authtok)]
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211 #[doc = manbsd!(3 pam_get_authtok)]
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212 fn authtok(&mut self, prompt: Option<&OsStr>) -> Result<OsString>;
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213
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214 /// Retrieves the user's old authentication token when changing passwords.
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215 ///
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216 /// This should only be used by a *password-change* module.
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217 ///
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218 /// # References
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219 ///
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220 #[doc = linklist!(pam_get_authtok: man7, manbsd)]
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221 ///
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222 /// # Example
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223 ///
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224 /// ```no_run
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225 /// # use nonstick::handle::ModuleClient;
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226 /// # fn _doc(handle: &mut impl ModuleClient) -> Result<(), Box<dyn std::error::Error>> {
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227 /// // Get the user's password using the default prompt.
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228 /// let pass = handle.old_authtok(None)?;
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229 /// // Get the user's password using a custom prompt.
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230 /// let pass = handle.old_authtok(Some("Reveal your secrets!".as_ref()))?;
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231 /// Ok(())
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232 /// # }
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233 /// ```
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234 ///
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235 #[doc = stdlinks!(3 pam_get_authtok)]
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236 fn old_authtok(&mut self, prompt: Option<&OsStr>) -> Result<OsString>;
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237
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238 getter!(
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239 /// Gets the user's authentication token (e.g., password).
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240 ///
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241 /// This is normally set automatically by PAM through [`Self::authtok`],
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242 /// but this will get its value (if set) without prompting the user.
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243 ///
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244 /// Like `authtok`, this should only ever be called
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245 /// by *authentication* and *password-change* PAM modules.
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246 ///
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247 /// # References
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248 ///
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249 #[doc = linklist!(pam_set_item: mwg, adg, _std)]
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250 ///
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251 #[doc = guide!(adg: "adg-interface-by-app-expected.html#adg-pam_set_item")]
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252 #[doc = guide!(mwg: "mwg-expected-by-module-item.html#mwg-pam_set_item")]
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253 #[doc = stdlinks!(3 pam_set_item)]
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254 authtok_item("PAM_AUTHTOK", see = Self::authtok)
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255 );
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256
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257 getter!(
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258 /// Gets the user's old authentication token when changing passwords.
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259 ///
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260 /// This is normally set automatically by PAM through
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261 /// [`Self::old_authtok`], but this will get its value (if set)
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262 /// without prompting the user.
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263 ///
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264 /// This should only ever be called by *password-change* PAM modules.
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265 ///
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266 /// # References
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267 ///
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268 #[doc = linklist!(pam_set_item: mwg, adg, _std)]
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269 ///
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270 #[doc = guide!(adg: "adg-interface-by-app-expected.html#adg-pam_set_item")]
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271 #[doc = guide!(mwg: "mwg-expected-by-module-item.html#mwg-pam_set_item")]
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272 #[doc = stdlinks!(3 pam_set_item)]
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273 old_authtok_item("PAM_OLDAUTHTOK", see = ItemsMut::set_old_authtok)
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274 );
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275 }