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annotate src/module.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 c7c596e6388f
children 002adfb98c5c
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1 //! Functions and types useful for implementing a PAM module.
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2
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3 // Temporarily allowed until we get the actual conversation functions hooked up.
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4 #![allow(dead_code)]
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5
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6 use crate::constants::{ErrorCode, Flags, Result};
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7 use crate::handle::PamHandleModule;
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8 use std::ffi::CStr;
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9
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10 /// A trait for a PAM module to implement.
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11 ///
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12 /// The default implementations of all these hooks tell PAM to ignore them
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13 /// (i.e., behave as if this module does not exist) by returning [`ErrorCode::Ignore`].
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14 /// Override any functions you wish to handle in your module.
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15 /// After implementing this trait, use the [`pam_hooks!`](crate::pam_hooks!) macro
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16 /// to make the functions available to PAM.
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17 ///
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18 /// For more information, see [`pam(3)`’s root manual page][manpage]
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19 /// and the [PAM Module Writer’s Guide][mwg].
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20 ///
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21 /// [manpage]: https://www.man7.org/linux/man-pages/man3/pam.3.html
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22 /// [mwg]: https://www.chiark.greenend.org.uk/doc/libpam-doc/html/Linux-PAM_MWG.html
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23 #[allow(unused_variables)]
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24 pub trait PamModule<T: PamHandleModule> {
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25 // Functions for auth modules.
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26
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27 /// Authenticate the user.
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28 ///
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29 /// This is probably the first thing you want to implement.
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30 /// In most cases, you will want to get the user and password,
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31 /// using [`PamHandle::get_user`] and [`PamModuleOnly::get_authtok`],
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32 /// and verify them against something.
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33 ///
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34 /// See [the Module Writer's Guide entry for `pam_sm_authenticate`][mwg]
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35 /// for more information.
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36 ///
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37 /// # Valid flags
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38 ///
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39 /// This function may be called with the following flags set:
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40 ///
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41 /// - [`Flags::SILENT`]
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42 /// - [`Flags::DISALLOW_NULL_AUTHTOK`]
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43 ///
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44 /// # Returns
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45 ///
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46 /// If the password check was successful, return `Ok(())`.
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47 ///
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48 /// Sensible error codes to return include:
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49 ///
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50 /// - [`ErrorCode::AuthenticationError`]: Generic authentication error
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51 /// (like an incorrect password).
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52 /// - [`ErrorCode::CredentialsInsufficient`]: The application does not have
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53 /// sufficient credentials to authenticate the user.
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54 /// - [`ErrorCode::AuthInfoUnavailable`]: The module was not able to access
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55 /// the authentication information, for instance due to a network failure.
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56 /// - [`ErrorCode::UserUnknown`]: The supplied username is not known by this service.
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57 /// - [`ErrorCode::MaxTries`]: The user has tried authenticating too many times.
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58 /// They should not try again.
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59 ///
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60 /// [mwg]: https://www.chiark.greenend.org.uk/doc/libpam-doc/html/mwg-expected-of-module-auth.html#mwg-pam_sm_authenticate
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61 fn authenticate(handle: &mut T, args: Vec<&CStr>, flags: Flags) -> Result<()> {
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62 Err(ErrorCode::Ignore)
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63 }
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65 /// Perform "account management".
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66 ///
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67 /// When PAM calls this function, the user has already been authenticated
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68 /// by an authentication module (either this one or some other module).
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69 /// This hook can check for other things, for instance:
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70 ///
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71 /// - Date/time (keep your kids off the computer at night)
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72 /// - Remote host (only let employees log in from the office)
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73 ///
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74 /// You can also check things like, e.g., password expiration,
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75 /// and alert that the user change it before continuing,
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76 /// or really do whatever you want.
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77 ///
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78 /// See [the Module Writer's Guide entry for `pam_sm_acct_mgmt`][mwg]
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79 /// for more information.
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80 ///
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81 /// # Valid flags
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82 ///
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83 /// This function may be called with the following flags set:
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84 ///
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85 /// - [`Flags::SILENT`]
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86 /// - [`Flags::DISALLOW_NULL_AUTHTOK`]
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87 ///
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88 /// # Returns
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89 ///
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90 /// If the user should be allowed to log in, return `Ok(())`.
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91 ///
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92 /// Sensible error codes to return include:
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93 ///
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94 /// - [`ErrorCode::AccountExpired`]: The user's account has expired.
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95 /// - [`ErrorCode::AuthenticationError`]: Generic authentication error.
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96 /// - [`ErrorCode::NewAuthTokRequired`]: The user's authentication token has expired.
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97 /// PAM will ask the user to set a new authentication token, which may be handled by
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98 /// this module in [`Self::change_authtok`].
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99 /// - [`ErrorCode::PermissionDenied`]: This one is pretty self-explanatory.
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100 /// - [`ErrorCode::UserUnknown`]: The supplied username is not known by this service.
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101 ///
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102 /// [mwg]: https://www.chiark.greenend.org.uk/doc/libpam-doc/html/mwg-expected-of-module-acct.html#mwg-pam_sm_acct_mgmt
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103 fn account_management(handle: &mut T, args: Vec<&CStr>, flags: Flags) -> Result<()> {
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104 Err(ErrorCode::Ignore)
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105 }
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106
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107 /// Set credentials on this session.
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108 ///
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109 /// If an authentication module knows more about the user than just
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110 /// their authentication token, then it uses this function to provide
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111 /// that information to the application. It should only be called after
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112 /// authentication but before a session is established.
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113 ///
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114 /// See [the Module Writer's Guide entry for `pam_sm_setcred`][mwg]
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115 /// for more information.
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116 ///
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117 /// # Valid flags
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118 ///
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119 /// This function may be called with the following flags set:
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120 ///
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121 /// - [`Flags::SILENT`]
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122 /// - [`Flags::ESTABLISH_CREDENTIALS`]: Initialize credentials for the user.
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123 /// - [`Flags::DELETE_CREDENTIALS`]: Delete the credentials associated with this module.
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124 /// - [`Flags::REINITIALIZE_CREDENTIALS`]: Re-initialize credentials for this user.
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125 /// - [`Flags::REFRESH_CREDENTIALS`]: Extend the lifetime of the user's credentials.
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126 ///
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127 /// # Returns
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128 ///
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129 /// If credentials were set successfully, return `Ok(())`.
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130 ///
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131 /// Sensible error codes to return include:
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132 ///
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133 /// - [`ErrorCode::CredentialsUnavailable`]: The credentials cannot be retrieved.
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134 /// - [`ErrorCode::CredentialsExpired`]: The credentials have expired.
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135 /// - [`ErrorCode::CredentialsError`]: Some other error occurred when setting credentials.
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136 /// - [`ErrorCode::UserUnknown`]: The supplied username is not known by this service.
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137 ///
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138 /// [mwg]: https://www.chiark.greenend.org.uk/doc/libpam-doc/html/mwg-expected-of-module-auth.html#mwg-pam_sm_setcred
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139 fn set_credentials(handle: &mut T, args: Vec<&CStr>, flags: Flags) -> Result<()> {
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140 Err(ErrorCode::Ignore)
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141 }
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142
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143 // Function for chauthtok modules.
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144
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145 /// Called to set or reset the user's authentication token.
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146 ///
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147 /// PAM calls this function twice in succession.
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148 /// 1. The first time, [`Flags::PRELIMINARY_CHECK`] will be set.
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149 /// If the new token is acceptable, return success;
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150 /// if not, return [`ErrorCode::TryAgain`] to re-prompt the user.
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151 /// 2. After the preliminary check succeeds, [`Flags::UPDATE_AUTHTOK`]
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152 /// will be set. On this call, actually update the stored auth token.
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153 ///
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154 /// See [the Module Writer's Guide entry for `pam_sm_chauthtok`][mwg]
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155 /// for more information.
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156 ///
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157 /// # Valid flags
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158 ///
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159 /// This function may be called with the following flags set:
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160 ///
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161 /// - [`Flags::SILENT`]
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162 /// - [`Flags::CHANGE_EXPIRED_AUTHTOK`]: This module should only change
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163 /// any expired passwords, and leave non-expired passwords alone.
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164 /// If present, it _must_ be combined with one of the following.
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165 /// - [`Flags::PRELIMINARY_CHECK`]: Don't actually change the password,
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166 /// just check if the new one is valid.
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167 /// - [`Flags::UPDATE_AUTHTOK`]: Do actually change the password.
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168 ///
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169 /// # Returns
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170 ///
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171 /// If the authentication token was changed successfully
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172 /// (or the check passed), return `Ok(())`.
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173 ///
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174 /// Sensible error codes to return include:
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175 ///
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176 /// - [`ErrorCode::AuthTokError`]: The service could not get the authentication token.
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177 /// - [`ErrorCode::AuthTokRecoveryError`]: The service could not get the old token.
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178 /// - [`ErrorCode::AuthTokLockBusy`]: The password cannot be changed because
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179 /// the authentication token is currently locked.
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180 /// - [`ErrorCode::AuthTokDisableAging`]: Aging (expiration) is disabled.
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181 /// - [`ErrorCode::PermissionDenied`]: What it says on the tin.
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182 /// - [`ErrorCode::TryAgain`]: When the preliminary check is unsuccessful,
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183 /// ask the user for a new authentication token.
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184 /// - [`ErrorCode::UserUnknown`]: The supplied username is not known by this service.
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185 ///
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186 /// [mwg]: https://www.chiark.greenend.org.uk/doc/libpam-doc/html/mwg-expected-of-module-chauthtok.html#mwg-pam_sm_chauthtok
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187 fn change_authtok(handle: &mut T, args: Vec<&CStr>, flags: Flags) -> Result<()> {
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188 Err(ErrorCode::Ignore)
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189 }
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190
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191 // Functions for session modules.
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192
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193 /// Called when a session is opened.
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194 ///
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195 /// See [the Module Writer's Guide entry for `pam_sm_open_session`][mwg]
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196 /// for more information.
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197 ///
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198 /// # Valid flags
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199 ///
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200 /// The only valid flag is [`Flags::SILENT`].
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201 ///
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202 /// # Returns
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203 ///
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204 /// If the session was opened successfully, return `Ok(())`.
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205 ///
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206 /// A sensible error code to return is:
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207 ///
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208 /// - [`ErrorCode::SessionError`]: Cannot make an entry for this session.
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209 ///
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210 /// [mwg]: https://www.chiark.greenend.org.uk/doc/libpam-doc/html/mwg-expected-of-module-session.html#mwg-pam_sm_open_session
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211 fn open_session(handle: &mut T, args: Vec<&CStr>, flags: Flags) -> Result<()> {
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212 Err(ErrorCode::Ignore)
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213 }
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214
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215 /// Called when a session is being terminated.
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216 ///
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217 /// See [the Module Writer's Guide entry for `pam_sm_close_session`][mwg]
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218 /// for more information.
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219 ///
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220 /// # Valid flags
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221 ///
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222 /// The only valid flag is [`Flags::SILENT`].
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223 ///
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224 /// # Returns
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225 ///
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226 /// If the session was closed successfully, return `Ok(())`.
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227 ///
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228 /// A sensible error code to return is:
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229 ///
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230 /// - [`ErrorCode::SessionError`]: Cannot remove an entry for this session.
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231 ///
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232 /// [mwg]: https://www.chiark.greenend.org.uk/doc/libpam-doc/html/mwg-expected-of-module-session.html#mwg-pam_sm_close_session
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233 fn close_session(handle: &mut T, args: Vec<&CStr>, flags: Flags) -> Result<()> {
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234 Err(ErrorCode::Ignore)
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235 }
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236 }