Mercurial > crates > nonstick

annotate src/libpam/handle.rs @ 90:f6186e41399b

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Miscellaneous fixes and cleanup: - Rename `get_user` to `username` and `get_authtok` to `authtok`. - Use pam_strerror for error messages. - Add library linkage to build.rs (it was missing???).
author Paul Fisher <paul@pfish.zone>
date Sat, 14 Jun 2025 09:30:16 -0400
parents 5aa1a010f1e8
children 5ddbcada30f2
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1 use super::conversation::LibPamConversation;
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2 use crate::constants::{ErrorCode, Result};
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3 use crate::conv::Message;
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4 use crate::handle::PamShared;
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5 pub use crate::libpam::pam_ffi::LibPamHandle;
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6 use crate::libpam::{memory, pam_ffi};
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7 use crate::{Conversation, PamHandleModule};
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8 use num_enum::{IntoPrimitive, TryFromPrimitive};
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9 use std::cell::Cell;
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10 use std::ffi::{c_char, c_int};
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11 use std::marker::PhantomData;
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12 use std::ops::{Deref, DerefMut};
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13 use std::ptr;
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14
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15 struct HandleWrap(*mut LibPamHandle);
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16
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17 impl Deref for HandleWrap {
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18 type Target = LibPamHandle;
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19 fn deref(&self) -> &Self::Target {
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20 unsafe { &*self.0 }
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21 }
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22 }
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23
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24 impl DerefMut for HandleWrap {
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25 fn deref_mut(&mut self) -> &mut Self::Target {
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26 unsafe { &mut *self.0 }
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27 }
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28 }
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29
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30 /// An owned PAM handle.
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31 pub struct OwnedLibPamHandle<'a> {
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32 handle: HandleWrap,
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33 last_return: Cell<Result<()>>,
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34 _conversation_lifetime: PhantomData<&'a mut ()>,
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35 }
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36
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37 // TODO: pam_authenticate - app
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38 // pam_setcred - app
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39 // pam_acct_mgmt - app
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40 // pam_chauthtok - app
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41 // pam_open_session - app
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42 // pam_close_session - app
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43 // pam_putenv - shared
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44 // pam_getenv - shared
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45 // pam_getenvlist - shared
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46
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47 impl Drop for OwnedLibPamHandle<'_> {
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48 /// Closes the PAM session on an owned PAM handle.
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49 ///
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50 /// See the [`pam_end` manual page][man] for more information.
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51 ///
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52 /// [man]: https://www.man7.org/linux/man-pages/man3/pam_end.3.html
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53 fn drop(&mut self) {
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54 unsafe {
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55 pam_ffi::pam_end(
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56 self.handle.0,
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57 ErrorCode::result_to_c(self.last_return.get()),
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58 );
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59 }
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60 }
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61 }
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62
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63 macro_rules! cstr_item {
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64 (get = $getter:ident, item = $item_type:path) => {
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65 fn $getter(&self) -> Result<Option<&str>> {
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66 unsafe { self.get_cstr_item($item_type) }
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67 }
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68 };
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69 (set = $setter:ident, item = $item_type:path) => {
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70 fn $setter(&mut self, value: Option<&str>) -> Result<()> {
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71 unsafe { self.set_cstr_item($item_type, value) }
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72 }
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73 };
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74 }
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75
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76 impl PamShared for LibPamHandle {
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77 fn username(&mut self, prompt: Option<&str>) -> Result<&str> {
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78 let prompt = memory::option_cstr(prompt)?;
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79 let mut output: *const c_char = ptr::null();
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80 let ret = unsafe {
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81 pam_ffi::pam_get_user(self, &mut output, memory::prompt_ptr(prompt.as_ref()))
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82 };
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83 ErrorCode::result_from(ret)?;
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84 unsafe { memory::wrap_string(output) }
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85 .transpose()
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86 .unwrap_or(Err(ErrorCode::ConversationError))
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87 }
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88
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89 cstr_item!(get = user_item, item = ItemType::User);
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90 cstr_item!(set = set_user_item, item = ItemType::User);
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91 cstr_item!(get = service, item = ItemType::Service);
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92 cstr_item!(set = set_service, item = ItemType::Service);
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93 cstr_item!(get = user_prompt, item = ItemType::UserPrompt);
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94 cstr_item!(set = set_user_prompt, item = ItemType::UserPrompt);
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95 cstr_item!(get = tty_name, item = ItemType::Tty);
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96 cstr_item!(set = set_tty_name, item = ItemType::Tty);
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97 cstr_item!(get = remote_user, item = ItemType::RemoteUser);
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98 cstr_item!(set = set_remote_user, item = ItemType::RemoteUser);
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99 cstr_item!(get = remote_host, item = ItemType::RemoteHost);
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100 cstr_item!(set = set_remote_host, item = ItemType::RemoteHost);
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101 cstr_item!(set = set_authtok_item, item = ItemType::AuthTok);
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102 cstr_item!(set = set_old_authtok_item, item = ItemType::OldAuthTok);
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103 }
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104
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105 impl Conversation for LibPamHandle {
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106 fn communicate(&mut self, messages: &[Message]) {
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107 match self.conversation_item() {
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108 Ok(conv) => conv.communicate(messages),
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109 Err(e) => {
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110 for msg in messages {
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111 msg.set_error(e)
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112 }
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113 }
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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 PamHandleModule for LibPamHandle {
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119 fn authtok(&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_mut();
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122 // SAFETY: We're calling this with known-good values.
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123 let res = unsafe {
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124 pam_ffi::pam_get_authtok(
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125 self,
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126 ItemType::AuthTok.into(),
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127 &mut output,
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128 memory::prompt_ptr(prompt.as_ref()),
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129 )
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130 };
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131 ErrorCode::result_from(res)?;
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132 // SAFETY: We got this string from PAM.
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133 unsafe { memory::wrap_string(output) }
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134 .transpose()
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135 .unwrap_or(Err(ErrorCode::ConversationError))
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136 }
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137
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138 cstr_item!(get = authtok_item, item = ItemType::AuthTok);
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139 cstr_item!(get = old_authtok_item, item = ItemType::OldAuthTok);
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140 }
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141
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142 /// Function called at the end of a PAM session that is called to clean up
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143 /// a value previously provided to PAM in a `pam_set_data` call.
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144 ///
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145 /// You should never call this yourself.
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146 extern "C" fn set_data_cleanup<T>(_: *const libc::c_void, c_data: *mut libc::c_void, _: c_int) {
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147 unsafe {
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148 let _data: Box<T> = Box::from_raw(c_data.cast());
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149 }
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150 }
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151
80
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152 impl LibPamHandle {
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153 /// Gets a C string item.
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154 ///
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155 /// # Safety
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156 ///
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157 /// You better be requesting an item which is a C string.
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158 unsafe fn get_cstr_item(&self, item_type: ItemType) -> Result<Option<&str>> {
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159 let mut output = ptr::null();
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160 let ret = unsafe { pam_ffi::pam_get_item(self, item_type as c_int, &mut output) };
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161 ErrorCode::result_from(ret)?;
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162 memory::wrap_string(output.cast())
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163 }
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164
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165 /// Sets a C string item.
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166 ///
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167 /// # Safety
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168 ///
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169 /// You better be setting an item which is a C string.
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170 unsafe fn set_cstr_item(&mut self, item_type: ItemType, data: Option<&str>) -> Result<()> {
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171 let data_str = memory::option_cstr(data)?;
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172 let ret = unsafe {
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173 pam_ffi::pam_set_item(
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174 self,
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175 item_type as c_int,
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176 memory::prompt_ptr(data_str.as_ref()).cast(),
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177 )
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178 };
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179 ErrorCode::result_from(ret)
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180 }
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181
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182 /// Gets the `PAM_CONV` item from the handle.
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183 fn conversation_item(&mut self) -> Result<&mut LibPamConversation<'_>> {
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184 let output: *mut LibPamConversation = ptr::null_mut();
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185 let result = unsafe {
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186 pam_ffi::pam_get_item(
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187 self,
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188 ItemType::Conversation.into(),
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189 &mut output.cast_const().cast(),
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190 )
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191 };
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192 ErrorCode::result_from(result)?;
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193 // SAFETY: We got this result from PAM, and we're checking if it's null.
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194 unsafe { output.as_mut() }.ok_or(ErrorCode::ConversationError)
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195 }
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196 }
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197
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198 macro_rules! delegate {
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199 (fn $meth:ident(&self $(, $param:ident: $typ:ty)*) -> Result<$ret:ty>) => {
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200 fn $meth(&self $(, $param: $typ)*) -> Result<$ret> {
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201 let result = self.handle.$meth($($param),*);
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202 self.last_return.set(split(&result));
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203 result
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204 }
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205 };
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206 (fn $meth:ident(&mut self $(, $param:ident: $typ:ty)*) -> Result<$ret:ty>) => {
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207 fn $meth(&mut self $(, $param: $typ)*) -> Result<$ret> {
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208 let result = self.handle.$meth($($param),*);
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209 self.last_return.set(split(&result));
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210 result
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211 }
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212 };
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213 (get = $get:ident$(, set = $set:ident)?) => {
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214 delegate!(fn $get(&self) -> Result<Option<&str>>);
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215 $(delegate!(set = $set);)?
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216 };
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217 (set = $set:ident) => {
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218 delegate!(fn $set(&mut self, value: Option<&str>) -> Result<()>);
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219 };
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220 }
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221
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222 fn split<T>(result: &Result<T>) -> Result<()> {
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223 result.as_ref().map(drop).map_err(|&e| e)
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224 }
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225
90
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226 impl PamShared for OwnedLibPamHandle<'_> {
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227 delegate!(fn username(&mut self, prompt: Option<&str>) -> Result<&str>);
80
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228 delegate!(get = user_item, set = set_user_item);
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229 delegate!(get = service, set = set_service);
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230 delegate!(get = user_prompt, set = set_user_prompt);
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231 delegate!(get = tty_name, set = set_tty_name);
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232 delegate!(get = remote_user, set = set_remote_user);
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233 delegate!(get = remote_host, set = set_remote_host);
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234 delegate!(set = set_authtok_item);
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235 delegate!(set = set_old_authtok_item);
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236 }
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237
73
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238 /// Identifies what is being gotten or set with `pam_get_item`
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239 /// or `pam_set_item`.
80
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240 #[derive(TryFromPrimitive, IntoPrimitive)]
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241 #[repr(i32)]
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242 #[non_exhaustive] // because C could give us anything!
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243 pub enum ItemType {
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244 /// The PAM service name.
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245 Service = 1,
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246 /// The user's login name.
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247 User = 2,
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248 /// The TTY name.
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249 Tty = 3,
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250 /// The remote host (if applicable).
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251 RemoteHost = 4,
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252 /// The conversation struct (not a CStr-based item).
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253 Conversation = 5,
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254 /// The authentication token (password).
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255 AuthTok = 6,
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256 /// The old authentication token (when changing passwords).
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257 OldAuthTok = 7,
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258 /// The remote user's name.
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259 RemoteUser = 8,
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260 /// The prompt shown when requesting a username.
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261 UserPrompt = 9,
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262 /// App-supplied function to override failure delays.
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263 FailDelay = 10,
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264 /// X display name.
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265 XDisplay = 11,
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266 /// X server authentication data.
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267 XAuthData = 12,
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268 /// The type of `pam_get_authtok`.
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269 AuthTokType = 13,
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270 }