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annotate src/libpam/conversation.rs @ 153:3036f2e6a022 default tip

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Add module-specific data support. This adds support for a safe form of `pam_get_data` and `pam_set_data`, where data is (as best as humanly possible) type-safe and restricted to only the module where it was created.
author Paul Fisher <paul@pfish.zone>
date Tue, 08 Jul 2025 00:31:54 -0400
parents 4b3a5095f68c
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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::question::Question;
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6 use crate::ErrorCode;
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7 use crate::Result;
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8 use libpam_sys::aliases::ConversationCallback;
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9 use libpam_sys_helpers::PtrPtrVec;
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10 use std::ffi::{c_int, c_void};
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11 use std::iter;
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12 use std::ptr::NonNull;
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13 use std::result::Result as StdResult;
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14
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15 /// The type used by PAM to call back into a conversation.
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16 ///
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17 /// This has the same structure as a [`libpam_sys::pam_conv`].
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18 #[derive(Debug)]
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19 #[repr(C)]
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20 pub struct OwnedConversation<C: Conversation> {
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21 callback: ConversationCallback,
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22 conv: Box<C>,
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23 }
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24
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25 impl<C: Conversation> OwnedConversation<C> {
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26 pub fn new(conv: C) -> Self {
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27 Self {
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28 callback: Self::wrapper_callback,
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29 conv: Box::new(conv),
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30 }
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31 }
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32
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33 /// Passed as the conversation function into PAM for an owned handle.
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34 ///
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35 /// PAM calls this, we compute answers, then send them back.
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36 unsafe extern "C" fn wrapper_callback(
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37 count: c_int,
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38 questions: *const *const libpam_sys::pam_message,
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39 answers: *mut *mut libpam_sys::pam_response,
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40 me: *mut c_void,
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41 ) -> c_int {
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42 let internal = || {
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43 // Collect all our pointers
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44 let conv = me
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45 .cast::<C>()
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46 .as_ref()
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47 .ok_or(ErrorCode::ConversationError)?;
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48 let q_iter = PtrPtrVec::<Question>::iter_over(questions, count as usize);
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49 let answers_ptr = answers.as_mut().ok_or(ErrorCode::ConversationError)?;
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50
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51 // Build our owned list of Q&As from the questions we've been asked
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52 let messages: Vec<OwnedExchange> = q_iter
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53 .map(TryInto::try_into)
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54 .collect::<Result<_>>()
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55 .map_err(|_| ErrorCode::ConversationError)?;
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56 // Borrow all those Q&As and ask them.
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57 // If we got an invalid message type, bail before sending.
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58 let borrowed: Result<Vec<_>> = messages.iter().map(Exchange::try_from).collect();
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59 // TODO: Do we want to log something here?
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60 conv.communicate(&borrowed?);
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61
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62 // Send our answers back.
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63 let owned = Answers::build(messages)?;
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64 *answers_ptr = owned.into_ptr();
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65 Ok(())
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66 };
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67 ErrorCode::result_to_c(internal())
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68 }
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69 }
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71 /// A conversation owned by a PAM handle and lent to us.
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72 pub struct PamConv(libpam_sys::pam_conv);
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74 impl Conversation for PamConv {
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75 fn communicate(&self, messages: &[Exchange]) {
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76 let internal = || {
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77 let questions: Result<_> = messages.iter().map(Question::try_from).collect();
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78 let questions = PtrPtrVec::new(questions?);
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79 let mut response_pointer = std::ptr::null_mut();
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80 // SAFETY: We're calling into PAM with valid everything.
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81 let result = unsafe {
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82 (self.0.conv)(
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83 messages.len() as c_int,
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84 questions.as_ptr(),
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85 &mut response_pointer,
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86 self.0.appdata_ptr,
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87 )
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88 };
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89 ErrorCode::result_from(result)?;
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90 // SAFETY: This is a pointer we just got back from PAM.
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91 // We have to trust that the responses from PAM match up
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92 // with the questions we sent.
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93 unsafe {
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94 let response_pointer =
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95 NonNull::new(response_pointer).ok_or(ErrorCode::ConversationError)?;
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96 let mut owned_responses = Answers::from_c_heap(response_pointer, messages.len());
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97 for (msg, response) in iter::zip(messages, owned_responses.iter_mut()) {
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98 convert(msg, response);
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99 }
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100 };
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101 Ok(())
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102 };
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103 if let Err(e) = internal() {
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104 messages.iter().for_each(|m| m.set_error(e))
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105 }
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106 }
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107 }
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108
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109 /// Like [`Exchange`], but this time we own the contents.
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110 #[derive(Debug)]
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111 pub enum OwnedExchange<'a> {
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112 MaskedPrompt(MaskedQAndA<'a>),
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113 Prompt(QAndA<'a>),
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114 Info(InfoMsg<'a>),
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115 Error(ErrorMsg<'a>),
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116 RadioPrompt(RadioQAndA<'a>),
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117 BinaryPrompt(BinaryQAndA<'a>),
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118 }
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119
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120 impl<'a> TryFrom<&'a OwnedExchange<'a>> for Exchange<'a> {
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121 type Error = ErrorCode;
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122 fn try_from(src: &'a OwnedExchange) -> StdResult<Self, ErrorCode> {
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123 match src {
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124 OwnedExchange::MaskedPrompt(m) => Ok(Exchange::MaskedPrompt(m)),
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125 OwnedExchange::Prompt(m) => Ok(Exchange::Prompt(m)),
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126 OwnedExchange::Info(m) => Ok(Exchange::Info(m)),
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127 OwnedExchange::Error(m) => Ok(Exchange::Error(m)),
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128 OwnedExchange::RadioPrompt(m) => Ok(Exchange::RadioPrompt(m)),
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129 OwnedExchange::BinaryPrompt(m) => Ok(Exchange::BinaryPrompt(m)),
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130 }
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131 }
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132 }
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133
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134 /// Fills in the answer of the Message with the given response.
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135 ///
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136 /// # Safety
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137 ///
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138 /// You are responsible for ensuring that the src-dst pair matches.
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139 unsafe fn convert(msg: &Exchange, resp: &mut Answer) {
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140 macro_rules! fill_text {
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141 ($dst:ident, $src:ident) => {{
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142 let text_resp = unsafe { TextAnswer::upcast($src) };
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143 $dst.set_answer(text_resp.contents().map(Into::into));
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144 }};
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145 }
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146 match *msg {
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147 Exchange::MaskedPrompt(qa) => fill_text!(qa, resp),
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148 Exchange::Prompt(qa) => fill_text!(qa, resp),
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149 Exchange::Error(m) => m.set_answer(Ok(())),
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150 Exchange::Info(m) => m.set_answer(Ok(())),
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151 Exchange::RadioPrompt(qa) => fill_text!(qa, resp),
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152 Exchange::BinaryPrompt(qa) => {
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153 let bin_resp = unsafe { BinaryAnswer::upcast(resp) };
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154 qa.set_answer(Ok(bin_resp
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155 .contents()
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156 .map(|d| d.into())
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157 .unwrap_or_default()));
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158 bin_resp.zero_contents()
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159 }
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160 }
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161 }