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annotate src/libpam/conversation.rs @ 87:05291b601f0a

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Well and truly separate the Linux extensions. This separates the Linux extensions on the libpam side, and disables the two enums on the interface side. Users can still call the Linux extensions from non-Linux PAM impls, but they'll get a conversation error back.
author Paul Fisher <paul@pfish.zone>
date Tue, 10 Jun 2025 04:40:01 -0400
parents 5aa1a010f1e8
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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Paul Fisher <paul@pfish.zone>
parents: 75
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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
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143 bin_resp.zero_contents()
73
ac6881304c78 Do conversations, along with way too much stuff.
Paul Fisher <paul@pfish.zone>
parents:
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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:
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146 }