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annotate src/libpam/conversation.rs @ 88:c9fc7e6257d3

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This is a v0.0.7 if I ever saw one.
author Paul Fisher <paul@pfish.zone>
date Tue, 10 Jun 2025 05:36:58 -0400
parents 05291b601f0a
children dd3e9c4bcde3
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87
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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::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 use std::result::Result as StdResult;
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15
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16 impl LibPamConversation<'_> {
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17 fn wrap<C: Conversation>(conv: &mut C) -> Self {
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18 Self {
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19 callback: Self::wrapper_callback::<C>,
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20 appdata: (conv as *mut C).cast(),
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21 life: PhantomData,
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22 _marker: Immovable(PhantomData),
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23 }
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24 }
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25
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26 /// Passed as the conversation function into PAM for an owned handle.
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27 ///
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28 /// PAM calls this, we compute answers, then send them back.
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29 unsafe extern "C" fn wrapper_callback<C: Conversation>(
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30 count: c_int,
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31 questions: *const *const Question,
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32 answers: *mut *mut Answer,
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33 me: *mut AppData,
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34 ) -> c_int {
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35 let internal = || {
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36 // Collect all our pointers
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37 let conv = me
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38 .cast::<C>()
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39 .as_mut()
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40 .ok_or(ErrorCode::ConversationError)?;
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41 let indirect = Indirect::borrow_ptr(questions).ok_or(ErrorCode::ConversationError)?;
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42 let answers_ptr = answers.as_mut().ok_or(ErrorCode::ConversationError)?;
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43
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44 // Build our owned list of Q&As from the questions we've been asked
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45 let messages: Vec<OwnedMessage> = indirect
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46 .iter(count as usize)
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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).map_err(|_| ErrorCode::ConversationError)?;
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58 *answers_ptr = owned.into_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(&mut self, messages: &[Message]) {
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67 let internal = || {
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68 let questions = 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.indirect(),
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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 mut owned_responses = Answers::from_c_heap(response_pointer, messages.len());
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85 for (msg, response) in iter::zip(messages, owned_responses.iter_mut()) {
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86 convert(msg, response);
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87 }
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88 };
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89 Ok(())
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90 };
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91 if let Err(e) = internal() {
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92 messages.iter().for_each(|m| m.set_error(e))
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93 }
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94 }
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95 }
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96
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97 /// Like [`Message`], but this time we own the contents.
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98 #[derive(Debug)]
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99 pub enum OwnedMessage<'a> {
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100 MaskedPrompt(MaskedQAndA<'a>),
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101 Prompt(QAndA<'a>),
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102 Info(InfoMsg<'a>),
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103 Error(ErrorMsg<'a>),
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104 RadioPrompt(RadioQAndA<'a>),
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105 BinaryPrompt(BinaryQAndA<'a>),
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106 }
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107
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108 impl<'a> TryFrom<&'a OwnedMessage<'a>> for Message<'a> {
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109 type Error = ErrorCode;
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110 fn try_from(src: &'a OwnedMessage) -> StdResult<Self, ErrorCode> {
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111 match src {
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112 OwnedMessage::MaskedPrompt(m) => Ok(Message::MaskedPrompt(m)),
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113 OwnedMessage::Prompt(m) => Ok(Message::Prompt(m)),
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114 OwnedMessage::Info(m) => Ok(Message::Info(m)),
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115 OwnedMessage::Error(m) => Ok(Message::Error(m)),
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116 OwnedMessage::RadioPrompt(m) => Ok(Message::RadioPrompt(m)),
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117 OwnedMessage::BinaryPrompt(m) => Ok(Message::BinaryPrompt(m)),
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118 }
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119 }
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120 }
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121
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122 /// Fills in the answer of the Message with the given response.
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123 ///
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124 /// # Safety
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125 ///
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126 /// You are responsible for ensuring that the src-dst pair matches.
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127 unsafe fn convert(msg: &Message, resp: &mut Answer) {
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128 macro_rules! fill_text {
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129 ($dst:ident, $src:ident) => {{
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130 let text_resp = unsafe { TextAnswer::upcast($src) };
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131 $dst.set_answer(text_resp.contents().map(Into::into));
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132 }};
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133 }
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134 match *msg {
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135 Message::MaskedPrompt(qa) => fill_text!(qa, resp),
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136 Message::Prompt(qa) => fill_text!(qa, resp),
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137 Message::Error(m) => m.set_answer(Ok(())),
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138 Message::Info(m) => m.set_answer(Ok(())),
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139 Message::RadioPrompt(qa) => fill_text!(qa, resp),
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140 Message::BinaryPrompt(qa) => {
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141 let bin_resp = unsafe { BinaryAnswer::upcast(resp) };
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142 qa.set_answer(Ok(bin_resp.data().into()));
351bdc13005e Update the libpam module to work with the new structure.
Paul Fisher <paul@pfish.zone>
parents: 75
diff changeset
143 bin_resp.zero_contents()
73
ac6881304c78 Do conversations, along with way too much stuff.
Paul Fisher <paul@pfish.zone>
parents:
diff changeset
144 }
77
351bdc13005e Update the libpam module to work with the new structure.
Paul Fisher <paul@pfish.zone>
parents: 75
diff changeset
145 }
73
ac6881304c78 Do conversations, along with way too much stuff.
Paul Fisher <paul@pfish.zone>
parents:
diff changeset
146 }