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annotate src/libpam/handle.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 c30811b4afae
children 002adfb98c5c
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rev   line source
73
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1 use super::conversation::LibPamConversation;
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2 use crate::constants::{ErrorCode, InvalidEnum, Result};
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3 use crate::conv::Message;
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4 use crate::handle::{PamApplicationOnly, PamModuleOnly, PamShared};
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c30811b4afae rename pam_ffi submodule to libpam.
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5 use crate::libpam::memory;
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6 use crate::libpam::memory::Immovable;
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7 use crate::Conversation;
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8 use num_derive::FromPrimitive;
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9 use num_traits::FromPrimitive;
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10 use std::ffi::{c_char, c_int};
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11 use std::ops::{Deref, DerefMut};
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12 use std::result::Result as StdResult;
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13 use std::{mem, ptr};
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14
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15 /// An owned PAM handle.
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16 #[repr(transparent)]
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17 pub struct OwnedLibPamHandle(*mut LibPamHandle);
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18
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19 /// An opaque structure that a PAM handle points to.
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20 #[repr(C)]
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21 pub struct LibPamHandle {
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22 _data: (),
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23 _marker: Immovable,
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24 }
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25
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26 impl LibPamHandle {
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27 /// Gets a C string item.
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28 ///
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29 /// # Safety
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30 ///
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31 /// You better be requesting an item which is a C string.
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32 unsafe fn get_cstr_item(&mut self, item_type: ItemType) -> Result<Option<&str>> {
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33 let mut output = ptr::null();
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34 let ret = unsafe { super::pam_get_item(self, item_type as c_int, &mut output) };
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35 ErrorCode::result_from(ret)?;
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36 memory::wrap_string(output.cast())
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37 }
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38
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39 /// Sets a C string item.
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40 ///
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41 /// # Safety
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42 ///
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43 /// You better be setting an item which is a C string.
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44 unsafe fn set_cstr_item(&mut self, item_type: ItemType, data: Option<&str>) -> Result<()> {
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45 let data_str = memory::option_cstr(data)?;
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46 let ret = unsafe {
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47 super::pam_set_item(
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48 self,
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49 item_type as c_int,
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50 memory::prompt_ptr(data_str.as_ref()).cast(),
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51 )
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52 };
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53 ErrorCode::result_from(ret)
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54 }
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55
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56 /// Gets the `PAM_CONV` item from the handle.
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57 fn conversation_item(&mut self) -> Result<&mut LibPamConversation> {
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58 let output: *mut LibPamConversation = ptr::null_mut();
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59 let result = unsafe {
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60 super::pam_get_item(
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61 self,
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62 ItemType::Conversation.into(),
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63 &mut output.cast_const().cast(),
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64 )
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65 };
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66 ErrorCode::result_from(result)?;
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67 // SAFETY: We got this result from PAM, and we're checking if it's null.
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68 unsafe { output.as_mut() }.ok_or(ErrorCode::ConversationError)
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69 }
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70 }
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71
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72 impl PamApplicationOnly for OwnedLibPamHandle {
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73 fn close(self, status: Result<()>) -> Result<()> {
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74 let ret = unsafe { super::pam_end(self.0, ErrorCode::result_to_c(status)) };
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75 // Forget rather than dropping, since dropping also calls pam_end.
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76 mem::forget(self);
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77 ErrorCode::result_from(ret)
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78 }
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79 }
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80
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81 impl Deref for OwnedLibPamHandle {
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82 type Target = LibPamHandle;
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83 fn deref(&self) -> &Self::Target {
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84 unsafe { &*self.0 }
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85 }
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86 }
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87
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88 impl DerefMut for OwnedLibPamHandle {
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89 fn deref_mut(&mut self) -> &mut Self::Target {
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90 unsafe { &mut *self.0 }
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91 }
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92 }
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93
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94 impl Drop for OwnedLibPamHandle {
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95 /// Ends the PAM session with a zero error code.
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96 /// You probably want to call [`close`](Self::close) instead of
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97 /// letting this drop by itself.
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98 fn drop(&mut self) {
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99 unsafe {
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100 super::pam_end(self.0, 0);
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101 }
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102 }
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103 }
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104
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105 macro_rules! cstr_item {
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106 (get = $getter:ident, item = $item_type:path) => {
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107 fn $getter(&mut self) -> Result<Option<&str>> {
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108 unsafe { self.get_cstr_item($item_type) }
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109 }
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110 };
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111 (set = $setter:ident, item = $item_type:path) => {
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112 fn $setter(&mut self, value: Option<&str>) -> Result<()> {
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113 unsafe { self.set_cstr_item($item_type, value) }
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114 }
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115 };
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116 }
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117
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118 impl PamShared for LibPamHandle {
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119 fn get_user(&mut self, prompt: Option<&str>) -> Result<&str> {
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120 let prompt = memory::option_cstr(prompt)?;
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121 let mut output: *const c_char = ptr::null();
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122 let ret =
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123 unsafe { super::pam_get_user(self, &mut output, memory::prompt_ptr(prompt.as_ref())) };
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124 ErrorCode::result_from(ret)?;
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125 unsafe { memory::wrap_string(output) }
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126 .transpose()
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127 .unwrap_or(Err(ErrorCode::ConversationError))
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128 }
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129
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130 cstr_item!(get = user_item, item = ItemType::User);
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131 cstr_item!(set = set_user_item, item = ItemType::User);
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132 cstr_item!(get = service, item = ItemType::Service);
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133 cstr_item!(set = set_service, item = ItemType::Service);
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134 cstr_item!(get = user_prompt, item = ItemType::UserPrompt);
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135 cstr_item!(set = set_user_prompt, item = ItemType::UserPrompt);
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136 cstr_item!(get = tty_name, item = ItemType::Tty);
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137 cstr_item!(set = set_tty_name, item = ItemType::Tty);
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138 cstr_item!(get = remote_user, item = ItemType::RemoteUser);
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139 cstr_item!(set = set_remote_user, item = ItemType::RemoteUser);
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140 cstr_item!(get = remote_host, item = ItemType::RemoteHost);
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141 cstr_item!(set = set_remote_host, item = ItemType::RemoteHost);
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142 cstr_item!(set = set_authtok_item, item = ItemType::AuthTok);
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143 cstr_item!(set = set_old_authtok_item, item = ItemType::OldAuthTok);
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144 }
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145
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146 impl Conversation for LibPamHandle {
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147 fn communicate(&mut self, messages: &[Message]) {
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148 match self.conversation_item() {
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149 Ok(conv) => conv.communicate(messages),
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150 Err(e) => {
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151 for msg in messages {
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152 msg.set_error(e)
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153 }
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154 }
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155 }
73
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156 }
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157 }
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158
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159 impl PamModuleOnly for LibPamHandle {
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160 fn get_authtok(&mut self, prompt: Option<&str>) -> Result<&str> {
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161 let prompt = memory::option_cstr(prompt)?;
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162 let mut output: *const c_char = ptr::null_mut();
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163 // SAFETY: We're calling this with known-good values.
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164 let res = unsafe {
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165 super::pam_get_authtok(
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166 self,
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167 ItemType::AuthTok.into(),
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168 &mut output,
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169 memory::prompt_ptr(prompt.as_ref()),
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170 )
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171 };
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172 ErrorCode::result_from(res)?;
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173 // SAFETY: We got this string from PAM.
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174 unsafe { memory::wrap_string(output) }
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175 .transpose()
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176 .unwrap_or(Err(ErrorCode::ConversationError))
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177 }
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178
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179 cstr_item!(get = authtok_item, item = ItemType::AuthTok);
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180 cstr_item!(get = old_authtok_item, item = ItemType::OldAuthTok);
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181 }
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182
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183 /// Function called at the end of a PAM session that is called to clean up
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184 /// a value previously provided to PAM in a `pam_set_data` call.
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185 ///
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186 /// You should never call this yourself.
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187 extern "C" fn set_data_cleanup<T>(_: *const libc::c_void, c_data: *mut libc::c_void, _: c_int) {
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188 unsafe {
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189 let _data: Box<T> = Box::from_raw(c_data.cast());
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190 }
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191 }
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192
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193 /// Identifies what is being gotten or set with `pam_get_item`
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194 /// or `pam_set_item`.
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195 #[derive(FromPrimitive)]
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196 #[repr(i32)]
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197 #[non_exhaustive] // because C could give us anything!
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198 pub enum ItemType {
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199 /// The PAM service name.
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200 Service = 1,
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201 /// The user's login name.
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202 User = 2,
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203 /// The TTY name.
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204 Tty = 3,
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205 /// The remote host (if applicable).
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206 RemoteHost = 4,
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207 /// The conversation struct (not a CStr-based item).
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208 Conversation = 5,
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209 /// The authentication token (password).
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210 AuthTok = 6,
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211 /// The old authentication token (when changing passwords).
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212 OldAuthTok = 7,
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213 /// The remote user's name.
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214 RemoteUser = 8,
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215 /// The prompt shown when requesting a username.
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216 UserPrompt = 9,
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217 /// App-supplied function to override failure delays.
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218 FailDelay = 10,
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219 /// X display name.
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220 XDisplay = 11,
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221 /// X server authentication data.
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222 XAuthData = 12,
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223 /// The type of `pam_get_authtok`.
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224 AuthTokType = 13,
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225 }
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226
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227 impl TryFrom<c_int> for ItemType {
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228 type Error = InvalidEnum<Self>;
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229 fn try_from(value: c_int) -> StdResult<Self, Self::Error> {
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230 Self::from_i32(value).ok_or(value.into())
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231 }
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232 }
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233
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234 impl From<ItemType> for c_int {
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235 fn from(val: ItemType) -> Self {
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236 val as Self
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237 }
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238 }