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annotate src/libpam/handle.rs @ 95:51c9d7e8261a

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Return owned strings rather than borrowed strings. It's going to be irritating to have to work with strings borrowed from the PAM handle rather than just using your own. They're cheap enough to copy.
author Paul Fisher <paul@pfish.zone>
date Mon, 23 Jun 2025 14:03:44 -0400
parents 5ddbcada30f2
children f3e260f9ddcb
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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::logging::Level;
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8 use crate::{Conversation, PamHandleModule};
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9 use num_enum::{IntoPrimitive, TryFromPrimitive};
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10 use std::cell::Cell;
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11 use std::ffi::{c_char, c_int, CString};
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12 use std::marker::PhantomData;
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13 use std::ops::{Deref, DerefMut};
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14 use std::ptr;
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15
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16 /// Owner for a PAM handle.
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17 struct HandleWrap(*mut LibPamHandle);
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18
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19 impl Deref for HandleWrap {
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20 type Target = LibPamHandle;
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21 fn deref(&self) -> &Self::Target {
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22 unsafe { &*self.0 }
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23 }
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24 }
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25
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26 impl DerefMut for HandleWrap {
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27 fn deref_mut(&mut self) -> &mut Self::Target {
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28 unsafe { &mut *self.0 }
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29 }
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30 }
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31
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32 /// An owned PAM handle.
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33 pub struct OwnedLibPamHandle<'a> {
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34 handle: HandleWrap,
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35 last_return: Cell<Result<()>>,
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36 _conversation_lifetime: PhantomData<&'a mut ()>,
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37 }
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38
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39 // TODO: pam_authenticate - app
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40 // pam_setcred - app
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41 // pam_acct_mgmt - app
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42 // pam_chauthtok - app
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43 // pam_open_session - app
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44 // pam_close_session - app
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45 // pam_putenv - shared
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46 // pam_getenv - shared
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47 // pam_getenvlist - shared
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48
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49 impl Drop for OwnedLibPamHandle<'_> {
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50 /// Closes the PAM session on an owned PAM handle.
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51 ///
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52 /// See the [`pam_end` manual page][man] for more information.
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53 ///
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54 /// [man]: https://www.man7.org/linux/man-pages/man3/pam_end.3.html
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55 fn drop(&mut self) {
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56 unsafe {
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57 pam_ffi::pam_end(
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58 self.handle.0,
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59 ErrorCode::result_to_c(self.last_return.get()),
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60 );
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61 }
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62 }
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63 }
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64
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65 /// Macro to implement getting/setting a CStr-based item.
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66 macro_rules! cstr_item {
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67 (get = $getter:ident, item = $item_type:path) => {
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68 fn $getter(&self) -> Result<Option<String>> {
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69 unsafe { self.get_cstr_item($item_type) }
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70 }
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71 };
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72 (set = $setter:ident, item = $item_type:path) => {
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73 fn $setter(&mut self, value: Option<&str>) -> Result<()> {
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74 unsafe { self.set_cstr_item($item_type, value) }
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75 }
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76 };
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77 }
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78
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79 impl PamShared for LibPamHandle {
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80 fn log(&self, level: Level, entry: &str) {
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81 let entry = match CString::new(entry).or_else(|_| CString::new(dbg!(entry))) {
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82 Ok(cstr) => cstr,
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83 _ => return,
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84 };
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85 #[cfg(pam_impl = "linux-pam")]
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86 {
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87 // SAFETY: We're calling this function with a known value.
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88 unsafe {
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89 pam_ffi::pam_syslog(self, level as c_int, c"%s".as_ptr().cast(), entry.as_ptr())
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90 }
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91 }
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92 #[cfg(pam_impl = "openpam")]
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93 {
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94 // SAFETY: We're calling this function with a known value.
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95 unsafe {
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96 pam_ffi::openpam_log(self, level as c_int, c"%s".as_ptr().cast(), entry.as_ptr())
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97 }
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98 }
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99 }
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100
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101 fn username(&mut self, prompt: Option<&str>) -> Result<String> {
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102 let prompt = memory::option_cstr(prompt)?;
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103 let mut output: *const c_char = ptr::null();
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104 let ret = unsafe {
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105 pam_ffi::pam_get_user(self, &mut output, memory::prompt_ptr(prompt.as_ref()))
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106 };
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107 ErrorCode::result_from(ret)?;
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108 unsafe { memory::copy_pam_string(output) }
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109 .transpose()
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110 .unwrap_or(Err(ErrorCode::ConversationError))
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111 }
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112
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113 cstr_item!(get = user_item, item = ItemType::User);
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114 cstr_item!(set = set_user_item, item = ItemType::User);
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115 cstr_item!(get = service, item = ItemType::Service);
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116 cstr_item!(set = set_service, item = ItemType::Service);
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117 cstr_item!(get = user_prompt, item = ItemType::UserPrompt);
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118 cstr_item!(set = set_user_prompt, item = ItemType::UserPrompt);
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119 cstr_item!(get = tty_name, item = ItemType::Tty);
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120 cstr_item!(set = set_tty_name, item = ItemType::Tty);
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121 cstr_item!(get = remote_user, item = ItemType::RemoteUser);
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122 cstr_item!(set = set_remote_user, item = ItemType::RemoteUser);
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123 cstr_item!(get = remote_host, item = ItemType::RemoteHost);
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124 cstr_item!(set = set_remote_host, item = ItemType::RemoteHost);
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125 cstr_item!(set = set_authtok_item, item = ItemType::AuthTok);
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126 cstr_item!(set = set_old_authtok_item, item = ItemType::OldAuthTok);
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127 }
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128
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129 impl Conversation for LibPamHandle {
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130 fn communicate(&mut self, messages: &[Message]) {
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131 match self.conversation_item() {
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132 Ok(conv) => conv.communicate(messages),
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133 Err(e) => {
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134 for msg in messages {
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135 msg.set_error(e)
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136 }
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137 }
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138 }
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139 }
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140 }
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141
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142 impl PamHandleModule for LibPamHandle {
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143 fn authtok(&mut self, prompt: Option<&str>) -> Result<String> {
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144 let prompt = memory::option_cstr(prompt)?;
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145 let mut output: *const c_char = ptr::null_mut();
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146 // SAFETY: We're calling this with known-good values.
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147 let res = unsafe {
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148 pam_ffi::pam_get_authtok(
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149 self,
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150 ItemType::AuthTok.into(),
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151 &mut output,
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152 memory::prompt_ptr(prompt.as_ref()),
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153 )
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154 };
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155 ErrorCode::result_from(res)?;
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156 // SAFETY: We got this string from PAM.
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157 unsafe { memory::copy_pam_string(output) }
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158 .transpose()
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159 .unwrap_or(Err(ErrorCode::ConversationError))
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160 }
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161
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162 cstr_item!(get = authtok_item, item = ItemType::AuthTok);
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163 cstr_item!(get = old_authtok_item, item = ItemType::OldAuthTok);
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164 }
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165
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166 /// Function called at the end of a PAM session that is called to clean up
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167 /// a value previously provided to PAM in a `pam_set_data` call.
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168 ///
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169 /// You should never call this yourself.
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170 extern "C" fn set_data_cleanup<T>(_: *const libc::c_void, c_data: *mut libc::c_void, _: c_int) {
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171 unsafe {
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172 let _data: Box<T> = Box::from_raw(c_data.cast());
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173 }
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174 }
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175
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176 impl LibPamHandle {
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177 /// Gets a C string item.
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178 ///
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179 /// # Safety
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180 ///
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181 /// You better be requesting an item which is a C string.
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182 unsafe fn get_cstr_item(&self, item_type: ItemType) -> Result<Option<String>> {
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183 let mut output = ptr::null();
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184 let ret = unsafe { pam_ffi::pam_get_item(self, item_type as c_int, &mut output) };
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185 ErrorCode::result_from(ret)?;
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186 memory::copy_pam_string(output.cast())
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187 }
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188
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189 /// Sets a C string item.
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190 ///
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191 /// # Safety
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192 ///
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193 /// You better be setting an item which is a C string.
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194 unsafe fn set_cstr_item(&mut self, item_type: ItemType, data: Option<&str>) -> Result<()> {
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195 let data_str = memory::option_cstr(data)?;
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196 let ret = unsafe {
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197 pam_ffi::pam_set_item(
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198 self,
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199 item_type as c_int,
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200 memory::prompt_ptr(data_str.as_ref()).cast(),
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201 )
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202 };
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203 ErrorCode::result_from(ret)
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204 }
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205
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206 /// Gets the `PAM_CONV` item from the handle.
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207 fn conversation_item(&mut self) -> Result<&mut LibPamConversation<'_>> {
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208 let output: *mut LibPamConversation = ptr::null_mut();
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209 let result = unsafe {
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210 pam_ffi::pam_get_item(
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211 self,
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212 ItemType::Conversation.into(),
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213 &mut output.cast_const().cast(),
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214 )
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215 };
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216 ErrorCode::result_from(result)?;
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217 // SAFETY: We got this result from PAM, and we're checking if it's null.
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218 unsafe { output.as_mut() }.ok_or(ErrorCode::ConversationError)
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219 }
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220 }
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221
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222 macro_rules! delegate {
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223 (fn $meth:ident(&self $(, $param:ident: $typ:ty)*) -> Result<$ret:ty>) => {
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224 fn $meth(&self $(, $param: $typ)*) -> Result<$ret> {
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225 let result = self.handle.$meth($($param),*);
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226 self.last_return.set(split(&result));
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227 result
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228 }
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229 };
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230 (fn $meth:ident(&mut self $(, $param:ident: $typ:ty)*) -> Result<$ret:ty>) => {
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231 fn $meth(&mut self $(, $param: $typ)*) -> Result<$ret> {
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232 let result = self.handle.$meth($($param),*);
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233 self.last_return.set(split(&result));
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234 result
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235 }
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236 };
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237 (get = $get:ident$(, set = $set:ident)?) => {
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238 delegate!(fn $get(&self) -> Result<Option<String>>);
80
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239 $(delegate!(set = $set);)?
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240 };
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241 (set = $set:ident) => {
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242 delegate!(fn $set(&mut self, value: Option<&str>) -> Result<()>);
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243 };
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244 }
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245
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246 fn split<T>(result: &Result<T>) -> Result<()> {
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247 result.as_ref().map(drop).map_err(|&e| e)
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248 }
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249
90
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250 impl PamShared for OwnedLibPamHandle<'_> {
92
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251 fn log(&self, level: Level, entry: &str) {
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252 self.handle.log(level, entry)
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253 }
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254 delegate!(fn username(&mut self, prompt: Option<&str>) -> Result<String>);
80
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255 delegate!(get = user_item, set = set_user_item);
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256 delegate!(get = service, set = set_service);
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257 delegate!(get = user_prompt, set = set_user_prompt);
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258 delegate!(get = tty_name, set = set_tty_name);
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259 delegate!(get = remote_user, set = set_remote_user);
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260 delegate!(get = remote_host, set = set_remote_host);
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261 delegate!(set = set_authtok_item);
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262 delegate!(set = set_old_authtok_item);
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263 }
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264
73
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265 /// Identifies what is being gotten or set with `pam_get_item`
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266 /// or `pam_set_item`.
80
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267 #[derive(TryFromPrimitive, IntoPrimitive)]
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268 #[repr(i32)]
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269 #[non_exhaustive] // because C could give us anything!
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270 pub enum ItemType {
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271 /// The PAM service name.
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272 Service = 1,
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273 /// The user's login name.
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274 User = 2,
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275 /// The TTY name.
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276 Tty = 3,
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277 /// The remote host (if applicable).
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278 RemoteHost = 4,
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279 /// The conversation struct (not a CStr-based item).
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280 Conversation = 5,
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281 /// The authentication token (password).
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282 AuthTok = 6,
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283 /// The old authentication token (when changing passwords).
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284 OldAuthTok = 7,
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Paul Fisher <paul@pfish.zone>
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285 /// The remote user's name.
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Paul Fisher <paul@pfish.zone>
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286 RemoteUser = 8,
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Paul Fisher <paul@pfish.zone>
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287 /// The prompt shown when requesting a username.
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288 UserPrompt = 9,
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289 /// App-supplied function to override failure delays.
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Paul Fisher <paul@pfish.zone>
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290 FailDelay = 10,
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Paul Fisher <paul@pfish.zone>
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291 /// X display name.
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Paul Fisher <paul@pfish.zone>
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292 XDisplay = 11,
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Paul Fisher <paul@pfish.zone>
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293 /// X server authentication data.
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Paul Fisher <paul@pfish.zone>
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294 XAuthData = 12,
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295 /// The type of `pam_get_authtok`.
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296 AuthTokType = 13,
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297 }