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annotate src/libpam/conversation.rs @ 132:0b6a17f8c894 default tip

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Get constant test working again with OpenPAM.
author Paul Fisher <paul@pfish.zone>
date Wed, 02 Jul 2025 02:34:29 -0400
parents 80c07e5ab22f
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, Exchange, InfoMsg, MaskedQAndA, 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::question::Question;
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7 use crate::ErrorCode;
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8 use crate::Result;
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9 use libpam_sys::helpers::PtrPtrVec;
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10 use libpam_sys::AppData;
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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::ptr::NonNull;
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15 use std::result::Result as StdResult;
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16
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17 /// The type used by PAM to call back into a conversation.
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18 #[repr(C)]
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19 pub struct LibPamConversation<'a> {
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20 pam_conv: libpam_sys::pam_conv,
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21 /// Marker to associate the lifetime of this with the conversation
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22 /// that was passed in.
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23 pub life: PhantomData<&'a mut ()>,
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24 }
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25
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26 impl LibPamConversation<'_> {
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27 pub fn wrap<C: Conversation>(conv: &C) -> Self {
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28 Self {
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29 pam_conv: libpam_sys::pam_conv {
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30 conv: Self::wrapper_callback::<C>,
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31 appdata_ptr: (conv as *const C).cast_mut().cast(),
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32 },
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33 life: PhantomData,
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34 }
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35 }
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36
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37 /// Passed as the conversation function into PAM for an owned handle.
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38 ///
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39 /// PAM calls this, we compute answers, then send them back.
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40 unsafe extern "C" fn wrapper_callback<C: Conversation>(
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41 count: c_int,
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42 questions: *const *const libpam_sys::pam_message,
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43 answers: *mut *mut libpam_sys::pam_response,
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44 me: *mut AppData,
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45 ) -> c_int {
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46 let internal = || {
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47 // Collect all our pointers
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48 let conv = me
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49 .cast::<C>()
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50 .as_ref()
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51 .ok_or(ErrorCode::ConversationError)?;
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52 let q_iter = PtrPtrVec::<Question>::iter_over(questions, count as usize);
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53 let answers_ptr = answers.as_mut().ok_or(ErrorCode::ConversationError)?;
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54
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55 // Build our owned list of Q&As from the questions we've been asked
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56 let messages: Vec<OwnedExchange> = q_iter
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57 .map(TryInto::try_into)
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58 .collect::<Result<_>>()
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59 .map_err(|_| ErrorCode::ConversationError)?;
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60 // Borrow all those Q&As and ask them.
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61 // If we got an invalid message type, bail before sending.
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62 let borrowed: Result<Vec<_>> = messages.iter().map(Exchange::try_from).collect();
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63 // TODO: Do we want to log something here?
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64 conv.communicate(&borrowed?);
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65
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66 // Send our answers back.
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67 let owned = Answers::build(messages)?;
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68 *answers_ptr = owned.into_ptr();
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69 Ok(())
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70 };
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71 ErrorCode::result_to_c(internal())
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72 }
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73 }
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74
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75 impl Conversation for LibPamConversation<'_> {
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76 fn communicate(&self, messages: &[Exchange]) {
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77 let internal = || {
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78 let questions: Result<_> = messages.iter().map(Question::try_from).collect();
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79 let questions = PtrPtrVec::new(questions?);
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80 let mut response_pointer = std::ptr::null_mut();
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81 // SAFETY: We're calling into PAM with valid everything.
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82 let result = unsafe {
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83 (self.pam_conv.conv)(
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84 messages.len() as c_int,
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85 questions.as_ptr(),
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86 &mut response_pointer,
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87 self.pam_conv.appdata_ptr,
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88 )
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89 };
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90 ErrorCode::result_from(result)?;
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91 // SAFETY: This is a pointer we just got back from PAM.
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92 // We have to trust that the responses from PAM match up
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93 // with the questions we sent.
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94 unsafe {
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95 let response_pointer =
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96 NonNull::new(response_pointer).ok_or(ErrorCode::ConversationError)?;
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97 let mut owned_responses = Answers::from_c_heap(response_pointer, messages.len());
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98 for (msg, response) in iter::zip(messages, owned_responses.iter_mut()) {
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99 convert(msg, response);
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100 }
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101 };
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102 Ok(())
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103 };
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104 if let Err(e) = internal() {
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105 messages.iter().for_each(|m| m.set_error(e))
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106 }
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107 }
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108 }
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109
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110 /// Like [`Exchange`], but this time we own the contents.
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111 #[derive(Debug)]
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112 pub enum OwnedExchange<'a> {
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113 MaskedPrompt(MaskedQAndA<'a>),
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114 Prompt(QAndA<'a>),
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115 Info(InfoMsg<'a>),
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116 Error(ErrorMsg<'a>),
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117 RadioPrompt(RadioQAndA<'a>),
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118 BinaryPrompt(BinaryQAndA<'a>),
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119 }
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120
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121 impl<'a> TryFrom<&'a OwnedExchange<'a>> for Exchange<'a> {
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122 type Error = ErrorCode;
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123 fn try_from(src: &'a OwnedExchange) -> StdResult<Self, ErrorCode> {
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124 match src {
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125 OwnedExchange::MaskedPrompt(m) => Ok(Exchange::MaskedPrompt(m)),
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126 OwnedExchange::Prompt(m) => Ok(Exchange::Prompt(m)),
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127 OwnedExchange::Info(m) => Ok(Exchange::Info(m)),
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128 OwnedExchange::Error(m) => Ok(Exchange::Error(m)),
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129 OwnedExchange::RadioPrompt(m) => Ok(Exchange::RadioPrompt(m)),
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130 OwnedExchange::BinaryPrompt(m) => Ok(Exchange::BinaryPrompt(m)),
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131 }
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132 }
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133 }
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134
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135 /// Fills in the answer of the Message with the given response.
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136 ///
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137 /// # Safety
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138 ///
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139 /// You are responsible for ensuring that the src-dst pair matches.
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140 unsafe fn convert(msg: &Exchange, resp: &mut Answer) {
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141 macro_rules! fill_text {
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142 ($dst:ident, $src:ident) => {{
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143 let text_resp = unsafe { TextAnswer::upcast($src) };
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144 $dst.set_answer(text_resp.contents().map(Into::into));
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145 }};
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146 }
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147 match *msg {
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148 Exchange::MaskedPrompt(qa) => fill_text!(qa, resp),
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149 Exchange::Prompt(qa) => fill_text!(qa, resp),
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150 Exchange::Error(m) => m.set_answer(Ok(())),
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151 Exchange::Info(m) => m.set_answer(Ok(())),
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152 Exchange::RadioPrompt(qa) => fill_text!(qa, resp),
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153 Exchange::BinaryPrompt(qa) => {
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154 let bin_resp = unsafe { BinaryAnswer::upcast(resp) };
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155 qa.set_answer(Ok(bin_resp
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156 .data()
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157 .map(|d| unsafe { CBinaryData::as_binary_data(d) })
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158 .unwrap_or_default()));
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159 bin_resp.zero_contents()
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160 }
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161 }
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162 }