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annotate src/libpam/conversation.rs @ 80:5aa1a010f1e8

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Start using PAM headers; improve owned/borrowed distinction. - Uses bindgen to generate bindings (only if needed). - Gets the story together on owned vs. borrowed handles. - Reduces number of mutable borrows in handle operation (since `PamHandle` is neither `Send` nor `Sync`, we never have to worry about thread safety. - Improves a bunch of macros so we don't have our own special syntax for docs. - Implement question indirection for standard XSSO PAM implementations.
author Paul Fisher <paul@pfish.zone>
date Tue, 10 Jun 2025 01:09:30 -0400
parents 002adfb98c5c
children 05291b601f0a
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77
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1 use crate::conv::{
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2 BinaryQAndA, Conversation, ErrorMsg, InfoMsg, MaskedQAndA, Message, QAndA, RadioQAndA,
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3 };
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4 use crate::libpam::answer::{Answer, Answers, BinaryAnswer, TextAnswer};
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5 use crate::libpam::memory::Immovable;
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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::{Indirect, IndirectTrait, Question, Questions};
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9 use crate::ErrorCode;
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10 use crate::Result;
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11 use std::ffi::c_int;
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12 use std::iter;
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13 use std::marker::PhantomData;
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14
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15 impl LibPamConversation<'_> {
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16 fn wrap<C: Conversation>(conv: &mut C) -> Self {
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17 Self {
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18 callback: Self::wrapper_callback::<C>,
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19 appdata: (conv as *mut C).cast(),
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20 life: PhantomData,
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21 _marker: Immovable(PhantomData),
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22 }
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23 }
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24
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25 unsafe extern "C" fn wrapper_callback<C: Conversation>(
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26 count: c_int,
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27 questions: *const *const Question,
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28 answers: *mut *mut Answer,
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29 me: *mut AppData,
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30 ) -> c_int {
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31 let internal = || {
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32 // Collect all our pointers
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33 let conv = me
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34 .cast::<C>()
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35 .as_mut()
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36 .ok_or(ErrorCode::ConversationError)?;
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37 let indirect = Indirect::borrow_ptr(questions).ok_or(ErrorCode::ConversationError)?;
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38 let answers_ptr = answers.as_mut().ok_or(ErrorCode::ConversationError)?;
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39
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40 // Build our owned list of Q&As from the questions we've been asked
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41 let messages: Vec<OwnedMessage> = indirect
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42 .iter(count as usize)
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43 .map(TryInto::try_into)
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44 .collect::<Result<_>>()
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45 .map_err(|_| ErrorCode::ConversationError)?;
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46 // Borrow all those Q&As and ask them
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47 let borrowed: Vec<Message> = messages.iter().map(Into::into).collect();
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48 conv.communicate(&borrowed);
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49
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50 // Send our answers back
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51 let owned = Answers::build(messages).map_err(|_| ErrorCode::ConversationError)?;
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52 *answers_ptr = owned.into_ptr();
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53 Ok(())
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54 };
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55 ErrorCode::result_to_c(internal())
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56 }
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57 }
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58
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59 impl Conversation for LibPamConversation<'_> {
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60 fn communicate(&mut self, messages: &[Message]) {
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61 let internal = || {
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62 let questions = Questions::new(messages)?;
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63 let mut response_pointer = std::ptr::null_mut();
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64 // SAFETY: We're calling into PAM with valid everything.
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65 let result = unsafe {
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66 (self.callback)(
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67 messages.len() as c_int,
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68 questions.indirect(),
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69 &mut response_pointer,
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70 self.appdata,
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71 )
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72 };
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73 ErrorCode::result_from(result)?;
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74 // SAFETY: This is a pointer we just got back from PAM.
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75 // We have to trust that the responses from PAM match up
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76 // with the questions we sent.
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77 unsafe {
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78 let mut owned_responses = Answers::from_c_heap(response_pointer, messages.len());
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79 for (msg, response) in iter::zip(messages, owned_responses.iter_mut()) {
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80 convert(msg, response);
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81 }
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82 };
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83 Ok(())
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84 };
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85 if let Err(e) = internal() {
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86 messages.iter().for_each(|m| m.set_error(e))
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87 }
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88 }
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89 }
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90
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91 /// Like [`Message`], but this time we own the contents.
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92 #[derive(Debug)]
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93 pub enum OwnedMessage<'a> {
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94 MaskedPrompt(MaskedQAndA<'a>),
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95 Prompt(QAndA<'a>),
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96 RadioPrompt(RadioQAndA<'a>),
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97 BinaryPrompt(BinaryQAndA<'a>),
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98 Info(InfoMsg<'a>),
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99 Error(ErrorMsg<'a>),
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100 }
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101
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102 impl<'a> From<&'a OwnedMessage<'a>> for Message<'a> {
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103 fn from(src: &'a OwnedMessage) -> Self {
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104 match src {
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105 OwnedMessage::MaskedPrompt(m) => Message::MaskedPrompt(m),
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106 OwnedMessage::Prompt(m) => Message::Prompt(m),
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107 OwnedMessage::RadioPrompt(m) => Message::RadioPrompt(m),
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108 OwnedMessage::BinaryPrompt(m) => Message::BinaryPrompt(m),
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109 OwnedMessage::Info(m) => Message::Info(m),
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110 OwnedMessage::Error(m) => Message::Error(m),
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111 }
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112 }
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113 }
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114
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115 /// Fills in the answer of the Message with the given response.
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116 ///
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117 /// # Safety
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118 ///
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119 /// You are responsible for ensuring that the src-dst pair matches.
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120 unsafe fn convert(msg: &Message, resp: &mut Answer) {
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121 macro_rules! fill_text {
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122 ($dst:ident, $src:ident) => {{
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123 let text_resp = unsafe { TextAnswer::upcast($src) };
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124 $dst.set_answer(text_resp.contents().map(Into::into));
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125 }};
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126 }
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127 match *msg {
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128 Message::MaskedPrompt(qa) => fill_text!(qa, resp),
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129 Message::Prompt(qa) => fill_text!(qa, resp),
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130 Message::RadioPrompt(qa) => fill_text!(qa, resp),
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131 Message::Error(m) => m.set_answer(Ok(())),
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132 Message::Info(m) => m.set_answer(Ok(())),
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133 Message::BinaryPrompt(qa) => {
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134 let bin_resp = unsafe { BinaryAnswer::upcast(resp) };
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135 qa.set_answer(Ok(bin_resp.data().into()));
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136 bin_resp.zero_contents()
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137 }
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138 }
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139 }