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annotate src/libpam/conversation.rs @ 105:13b4d2a19674

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Support Rust v1.75.0. This is the version included in Ubuntu 24.04 LTS and Debian Trixie, so it's old enough to have wide penetration without being too old to get new features (Debian Stable, I love you but v1.63 is just not going to work out).
author Paul Fisher <paul@pfish.zone>
date Thu, 26 Jun 2025 00:48:51 -0400
parents 94b51fa4f797
children
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rev   line source
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1 use crate::conv::{BinaryQAndA, RadioQAndA};
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2 use crate::conv::{Conversation, ErrorMsg, InfoMsg, MaskedQAndA, Message, QAndA};
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3 use crate::libpam::answer::BinaryAnswer;
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4 use crate::libpam::answer::{Answer, Answers, TextAnswer};
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5 use crate::libpam::memory::CBinaryData;
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6 use crate::libpam::pam_ffi::AppData;
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7 pub use crate::libpam::pam_ffi::LibPamConversation;
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8 use crate::libpam::question::QuestionsTrait;
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9 use crate::libpam::question::{Question, Questions};
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10 use crate::ErrorCode;
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11 use crate::Result;
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12 use std::ffi::c_int;
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13 use std::iter;
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14 use std::marker::PhantomData;
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15 use std::ptr::NonNull;
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16 use std::result::Result as StdResult;
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17
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18 impl LibPamConversation<'_> {
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19 pub fn wrap<C: Conversation>(conv: &C) -> Self {
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20 Self {
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21 callback: Self::wrapper_callback::<C>,
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22 appdata: (conv as *const C).cast(),
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23 life: PhantomData,
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24 }
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25 }
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26
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27 /// Passed as the conversation function into PAM for an owned handle.
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28 ///
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29 /// PAM calls this, we compute answers, then send them back.
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30 unsafe extern "C" fn wrapper_callback<C: Conversation>(
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31 count: c_int,
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32 questions: *const *const Question,
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33 answers: *mut *mut Answer,
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34 me: *const AppData,
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35 ) -> c_int {
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36 let internal = || {
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37 // Collect all our pointers
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38 let conv = me
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39 .cast::<C>()
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40 .as_ref()
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41 .ok_or(ErrorCode::ConversationError)?;
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42 let indirect = Questions::borrow_ptr(questions, count as usize);
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43 let answers_ptr = answers.as_mut().ok_or(ErrorCode::ConversationError)?;
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44
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45 // Build our owned list of Q&As from the questions we've been asked
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46 let messages: Vec<OwnedMessage> = indirect
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47 .map(TryInto::try_into)
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48 .collect::<Result<_>>()
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49 .map_err(|_| ErrorCode::ConversationError)?;
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50 // Borrow all those Q&As and ask them.
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51 // If we got an invalid message type, bail before sending.
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52 let borrowed: Result<Vec<_>> = messages.iter().map(Message::try_from).collect();
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53 // TODO: Do we want to log something here?
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54 conv.communicate(&borrowed?);
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55
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56 // Send our answers back.
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57 let owned = Answers::build(messages)?;
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58 *answers_ptr = owned.into_ptr().as_ptr();
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59 Ok(())
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60 };
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61 ErrorCode::result_to_c(internal())
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62 }
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63 }
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64
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65 impl Conversation for LibPamConversation<'_> {
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66 fn communicate(&self, messages: &[Message]) {
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67 let internal = || {
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68 let questions = Box::pin(Questions::new(messages)?);
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69 let mut response_pointer = std::ptr::null_mut();
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70 // SAFETY: We're calling into PAM with valid everything.
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71 let result = unsafe {
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72 (self.callback)(
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73 messages.len() as c_int,
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74 questions.as_ref().ptr(),
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75 &mut response_pointer,
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76 self.appdata,
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77 )
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78 };
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79 ErrorCode::result_from(result)?;
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80 // SAFETY: This is a pointer we just got back from PAM.
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81 // We have to trust that the responses from PAM match up
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82 // with the questions we sent.
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83 unsafe {
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84 let response_pointer =
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85 NonNull::new(response_pointer).ok_or(ErrorCode::ConversationError)?;
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86 let mut owned_responses = Answers::from_c_heap(response_pointer, messages.len());
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87 for (msg, response) in iter::zip(messages, owned_responses.iter_mut()) {
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88 convert(msg, response);
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89 }
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90 };
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91 Ok(())
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92 };
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93 if let Err(e) = internal() {
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94 messages.iter().for_each(|m| m.set_error(e))
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95 }
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96 }
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97 }
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98
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99 /// Like [`Message`], but this time we own the contents.
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100 #[derive(Debug)]
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101 pub enum OwnedMessage<'a> {
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102 MaskedPrompt(MaskedQAndA<'a>),
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103 Prompt(QAndA<'a>),
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104 Info(InfoMsg<'a>),
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105 Error(ErrorMsg<'a>),
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106 RadioPrompt(RadioQAndA<'a>),
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107 BinaryPrompt(BinaryQAndA<'a>),
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108 }
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109
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110 impl<'a> TryFrom<&'a OwnedMessage<'a>> for Message<'a> {
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111 type Error = ErrorCode;
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112 fn try_from(src: &'a OwnedMessage) -> StdResult<Self, ErrorCode> {
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113 match src {
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114 OwnedMessage::MaskedPrompt(m) => Ok(Message::MaskedPrompt(m)),
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115 OwnedMessage::Prompt(m) => Ok(Message::Prompt(m)),
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116 OwnedMessage::Info(m) => Ok(Message::Info(m)),
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117 OwnedMessage::Error(m) => Ok(Message::Error(m)),
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118 OwnedMessage::RadioPrompt(m) => Ok(Message::RadioPrompt(m)),
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119 OwnedMessage::BinaryPrompt(m) => Ok(Message::BinaryPrompt(m)),
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120 }
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121 }
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122 }
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123
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124 /// Fills in the answer of the Message with the given response.
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125 ///
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126 /// # Safety
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127 ///
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128 /// You are responsible for ensuring that the src-dst pair matches.
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129 unsafe fn convert(msg: &Message, resp: &mut Answer) {
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130 macro_rules! fill_text {
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131 ($dst:ident, $src:ident) => {{
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132 let text_resp = unsafe { TextAnswer::upcast($src) };
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133 $dst.set_answer(text_resp.contents().map(Into::into));
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134 }};
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135 }
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136 match *msg {
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137 Message::MaskedPrompt(qa) => fill_text!(qa, resp),
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138 Message::Prompt(qa) => fill_text!(qa, resp),
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139 Message::Error(m) => m.set_answer(Ok(())),
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140 Message::Info(m) => m.set_answer(Ok(())),
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141 Message::RadioPrompt(qa) => fill_text!(qa, resp),
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142 Message::BinaryPrompt(qa) => {
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143 let bin_resp = unsafe { BinaryAnswer::upcast(resp) };
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144 qa.set_answer(Ok(bin_resp
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145 .data()
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146 .map(|d| unsafe { CBinaryData::as_binary_data(d) })
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147 .unwrap_or_default()));
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148 bin_resp.zero_contents()
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149 }
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150 }
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151 }