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annotate src/libpam/conversation.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
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1 use crate::conv::{
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2 BinaryQAndA, Conversation, ErrorMsg, InfoMsg, MaskedQAndA, Message, QAndA,
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3 RadioQAndA,
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4 };
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5 use crate::libpam::memory::Immovable;
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6 use crate::libpam::message::{Indirect, Questions};
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7 use crate::libpam::response::{Answer, Answers, BinaryAnswer, TextAnswer};
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8 use crate::ErrorCode;
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9 use crate::Result;
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10 use std::ffi::c_int;
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11 use std::iter;
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12 use std::marker::PhantomData;
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13
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14 /// An opaque structure that is passed through PAM in a conversation.
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15 #[repr(C)]
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16 pub struct AppData {
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17 _data: (),
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18 _marker: Immovable,
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19 }
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20
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21 /// The callback that PAM uses to get information in a conversation.
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22 ///
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23 /// - `num_msg` is the number of messages in the `pam_message` array.
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24 /// - `messages` is a pointer to the messages being sent to the user.
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25 /// For details about its structure, see the documentation of
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26 /// [`OwnedMessages`](super::OwnedMessages).
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27 /// - `responses` is a pointer to an array of [`Answer`]s,
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28 /// which PAM sets in response to a module's request.
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29 /// This is an array of structs, not an array of pointers to a struct.
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30 /// There should always be exactly as many `responses` as `num_msg`.
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31 /// - `appdata` is the `appdata` field of the [`LibPamConversation`] we were passed.
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32 pub type ConversationCallback = unsafe extern "C" fn(
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33 num_msg: c_int,
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34 messages: *const Indirect,
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35 responses: *mut *mut Answer,
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36 appdata: *mut AppData,
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37 ) -> c_int;
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38
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39 /// The type used by PAM to call back into a conversation.
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40 #[repr(C)]
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41 pub struct LibPamConversation<'a> {
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42 /// The function that is called to get information from the user.
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43 callback: ConversationCallback,
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44 /// The pointer that will be passed as the last parameter
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45 /// to the conversation callback.
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46 appdata: *mut AppData,
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47 life: PhantomData<&'a mut ()>,
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48 _marker: Immovable,
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49 }
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50
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51 impl LibPamConversation<'_> {
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52 fn wrap<C: Conversation>(conv: &mut C) -> Self {
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53 Self {
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54 callback: Self::wrapper_callback::<C>,
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55 appdata: (conv as *mut C).cast(),
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56 life: PhantomData,
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57 _marker: Immovable(PhantomData),
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58 }
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59 }
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60
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61 unsafe extern "C" fn wrapper_callback<C: Conversation>(
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62 count: c_int,
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63 questions: *const Indirect,
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64 answers: *mut *mut Answer,
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65 me: *mut AppData,
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66 ) -> c_int {
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67 let internal = || {
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68 // Collect all our pointers
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69 let conv = me
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70 .cast::<C>()
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71 .as_mut()
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72 .ok_or(ErrorCode::ConversationError)?;
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73 let indirect = questions.as_ref().ok_or(ErrorCode::ConversationError)?;
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74 let answers_ptr = answers.as_mut().ok_or(ErrorCode::ConversationError)?;
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75
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76 // Build our owned list of Q&As from the questions we've been asked
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77 let messages: Vec<OwnedMessage> = indirect
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78 .iter(count as usize)
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79 .map(OwnedMessage::try_from)
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80 .collect::<Result<_>>()
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81 .map_err(|_| ErrorCode::ConversationError)?;
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82 // Borrow all those Q&As and ask them
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83 let borrowed: Vec<Message> = messages.iter().map(Into::into).collect();
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84 conv.communicate(&borrowed);
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85
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86 // Send our answers back
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87 let owned = Answers::build(messages).map_err(|_| ErrorCode::ConversationError)?;
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88 *answers_ptr = owned.into_ptr();
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89 Ok(())
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90 };
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91 ErrorCode::result_to_c(internal())
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92 }
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93 }
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94
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95 impl Conversation for LibPamConversation<'_> {
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96 fn communicate(&mut self, messages: &[Message]) {
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97 let internal = || {
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98 let mut msgs_to_send = Questions::alloc(messages.len());
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99 for (dst, src) in iter::zip(msgs_to_send.iter_mut(), messages.iter()) {
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100 dst.fill(src).map_err(|_| ErrorCode::ConversationError)?
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101 }
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102 let mut response_pointer = std::ptr::null_mut();
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103 // SAFETY: We're calling into PAM with valid everything.
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104 let result = unsafe {
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105 (self.callback)(
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106 messages.len() as c_int,
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107 msgs_to_send.indirect(),
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108 &mut response_pointer,
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109 self.appdata,
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110 )
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111 };
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112 ErrorCode::result_from(result)?;
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113 // SAFETY: This is a pointer we just got back from PAM.
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114 // We have to trust that the responses from PAM match up
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115 // with the questions we sent.
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116 unsafe {
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117 let mut owned_responses = Answers::from_c_heap(response_pointer, messages.len());
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118 for (msg, response) in iter::zip(messages, owned_responses.iter_mut()) {
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119 convert(msg, response);
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120 }
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121 };
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122 Ok(())
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123 };
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124 if let Err(e) = internal() {
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125 messages.iter().for_each(|m| m.set_error(e))
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126 }
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127 }
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128 }
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129
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130 /// Like [`Message`], but this time we own the contents.
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131 pub enum OwnedMessage<'a> {
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132 MaskedPrompt(MaskedQAndA<'a>),
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133 Prompt(QAndA<'a>),
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134 RadioPrompt(RadioQAndA<'a>),
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135 BinaryPrompt(BinaryQAndA<'a>),
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136 Info(InfoMsg<'a>),
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137 Error(ErrorMsg<'a>),
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138 }
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139
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140 impl<'a> From<&'a OwnedMessage<'a>> for Message<'a> {
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141 fn from(src: &'a OwnedMessage) -> Self {
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142 match src {
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143 OwnedMessage::MaskedPrompt(m) => Message::MaskedPrompt(m),
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144 OwnedMessage::Prompt(m) => Message::Prompt(m),
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145 OwnedMessage::RadioPrompt(m) => Message::RadioPrompt(m),
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146 OwnedMessage::BinaryPrompt(m) => Message::BinaryPrompt(m),
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147 OwnedMessage::Info(m) => Message::Info(m),
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148 OwnedMessage::Error(m) => Message::Error(m),
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149 }
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150 }
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151 }
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152
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153 /// Fills in the answer of the Message with the given response.
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154 ///
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155 /// # Safety
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156 ///
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157 /// You are responsible for ensuring that the src-dst pair matches.
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158 unsafe fn convert(msg: &Message, resp: &mut Answer) {
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159 macro_rules! fill_text {
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160 ($dst:ident, $src:ident) => {{let text_resp = unsafe {TextAnswer::upcast($src)};
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161 $dst.set_answer(text_resp.contents().map(Into::into));}}
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162 }
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163 match *msg {
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164 Message::MaskedPrompt(qa) => fill_text!(qa, resp),
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165 Message::Prompt(qa) => fill_text!(qa, resp),
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166 Message::RadioPrompt(qa) => fill_text!(qa, resp),
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167 Message::Error(m) => m.set_answer(Ok(())),
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168 Message::Info(m) => m.set_answer(Ok(())),
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169 Message::BinaryPrompt(qa) => {
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170 let bin_resp = unsafe { BinaryAnswer::upcast(resp) };
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171 qa.set_answer(Ok(bin_resp.data().into()));
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172 bin_resp.zero_contents()
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173 }
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174 }
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175 }