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annotate src/libpam/handle.rs @ 93:efc2b56c8928

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Remove undefined behavior per MIRI. This replaces a bunch of raw pointers with NonNull and removes all the undefined behavior that we can find with MIRI. We also remove the `SecureString` dependency (since it doesn't work with MIRI, and because it's not really necessary).
author Paul Fisher <paul@pfish.zone>
date Mon, 23 Jun 2025 13:02:58 -0400
parents 5ddbcada30f2
children 51c9d7e8261a
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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 $getter(&self) -> Result<Option<&str>> {
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69 unsafe { self.get_cstr_item($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<&str> {
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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::wrap_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<&str> {
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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 {
80
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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::wrap_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<&str>> {
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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::wrap_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<&str>>);
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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
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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<&str>);
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)]
73
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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 }