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annotate src/libpam/conversation.rs @ 171:e27c5c667a5a

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Create full new types for return code and flags, separate end to end. This plumbs the ReturnCode and RawFlags types through the places where we call into or are called from PAM. Also adds Sun documentation to the project.
author Paul Fisher <paul@pfish.zone>
date Fri, 25 Jul 2025 20:52:14 -0400
parents a75a66cb4181
children 6727cbe56f4a
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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 use crate::constants::ReturnCode;
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15
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16 /// The type used by PAM to call back into a conversation.
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17 ///
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18 /// This has the same structure as a [`libpam_sys::pam_conv`].
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19 #[derive(Debug)]
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20 #[repr(C)]
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21 pub struct OwnedConversation<C: Conversation> {
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22 callback: ConversationCallback,
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23 conv: Box<C>,
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24 }
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25
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26 impl<C: Conversation> OwnedConversation<C> {
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27 pub fn new(conv: C) -> Self {
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28 Self {
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29 callback: Self::wrapper_callback,
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30 conv: Box::new(conv),
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31 }
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32 }
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33
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34 /// Passed as the conversation function into PAM for an owned handle.
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35 ///
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36 /// PAM calls this, we compute answers, then send them back.
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37 unsafe extern "C" fn wrapper_callback(
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38 count: c_int,
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39 questions: *const *const libpam_sys::pam_message,
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40 answers: *mut *mut libpam_sys::pam_response,
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41 me: *mut c_void,
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42 ) -> c_int {
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43 let internal = || {
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44 // Collect all our pointers
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45 let conv = me
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46 .cast::<C>()
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47 .as_ref()
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48 .ok_or(ErrorCode::ConversationError)?;
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49 let q_iter = PtrPtrVec::<Question>::iter_over(questions, count as usize);
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50 let answers_ptr = answers.as_mut().ok_or(ErrorCode::ConversationError)?;
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51
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52 // Build our owned list of Q&As from the questions we've been asked
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53 let messages: Vec<OwnedExchange> = q_iter
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54 .map(TryInto::try_into)
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55 .collect::<Result<_>>()
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56 .map_err(|_| ErrorCode::ConversationError)?;
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57 // Borrow all those Q&As and ask them.
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58 // If we got an invalid message type, bail before sending.
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59 let borrowed: Result<Vec<_>> = messages.iter().map(Exchange::try_from).collect();
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60 // TODO: Do we want to log something here?
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61 conv.communicate(&borrowed?);
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62
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63 // Send our answers back.
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64 let owned = Answers::build(messages)?;
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65 *answers_ptr = owned.into_ptr();
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66 Ok(())
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67 };
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68 ReturnCode::from(internal()).into()
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69 }
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70 }
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71
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72 /// A conversation owned by a PAM handle and lent to us.
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73 #[derive(Debug)]
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74 pub struct PamConv(libpam_sys::pam_conv);
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75
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76 impl Conversation for PamConv {
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77 fn communicate(&self, messages: &[Exchange]) {
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78 let internal = || {
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79 let questions: Result<_> = messages.iter().map(Question::try_from).collect();
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80 let questions = PtrPtrVec::new(questions?);
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81 let mut response_pointer = std::ptr::null_mut();
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82 // SAFETY: We're calling into PAM with valid everything.
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83 let result = unsafe {
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84 (self.0.conv)(
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85 messages.len() as c_int,
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86 questions.as_ptr(),
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87 &mut response_pointer,
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88 self.0.appdata_ptr,
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89 )
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90 };
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91 ErrorCode::result_from(result)?;
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92 // SAFETY: This is a pointer we just got back from PAM.
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93 // We have to trust that the responses from PAM match up
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94 // with the questions we sent.
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95 unsafe {
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96 let response_pointer =
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97 NonNull::new(response_pointer).ok_or(ErrorCode::ConversationError)?;
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98 let mut owned_responses = Answers::from_c_heap(response_pointer, messages.len());
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99 for (msg, response) in iter::zip(messages, owned_responses.iter_mut()) {
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100 convert(msg, response);
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101 }
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102 };
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103 Ok(())
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104 };
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105 if let Err(e) = internal() {
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106 messages.iter().for_each(|m| m.set_error(e))
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107 }
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108 }
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109 }
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110
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111 /// Like [`Exchange`], but this time we own the contents.
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112 #[derive(Debug)]
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113 pub enum OwnedExchange<'a> {
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114 MaskedPrompt(MaskedQAndA<'a>),
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115 Prompt(QAndA<'a>),
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116 Info(InfoMsg<'a>),
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117 Error(ErrorMsg<'a>),
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118 RadioPrompt(RadioQAndA<'a>),
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119 BinaryPrompt(BinaryQAndA<'a>),
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120 }
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121
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122 impl<'a> TryFrom<&'a OwnedExchange<'a>> for Exchange<'a> {
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123 type Error = ErrorCode;
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124 fn try_from(src: &'a OwnedExchange) -> StdResult<Self, ErrorCode> {
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125 match src {
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126 OwnedExchange::MaskedPrompt(m) => Ok(Exchange::MaskedPrompt(m)),
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127 OwnedExchange::Prompt(m) => Ok(Exchange::Prompt(m)),
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128 OwnedExchange::Info(m) => Ok(Exchange::Info(m)),
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129 OwnedExchange::Error(m) => Ok(Exchange::Error(m)),
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130 OwnedExchange::RadioPrompt(m) => Ok(Exchange::RadioPrompt(m)),
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131 OwnedExchange::BinaryPrompt(m) => Ok(Exchange::BinaryPrompt(m)),
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132 }
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133 }
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134 }
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135
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136 /// Fills in the answer of the Message with the given response.
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137 ///
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138 /// # Safety
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139 ///
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140 /// You are responsible for ensuring that the src-dst pair matches.
130
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141 unsafe fn convert(msg: &Exchange, resp: &mut Answer) {
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142 macro_rules! fill_text {
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143 ($dst:ident, $src:ident) => {{
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144 let text_resp = unsafe { TextAnswer::upcast($src) };
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145 $dst.set_answer(text_resp.contents().map(Into::into));
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146 }};
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147 }
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148 match *msg {
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149 Exchange::MaskedPrompt(qa) => fill_text!(qa, resp),
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150 Exchange::Prompt(qa) => fill_text!(qa, resp),
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151 Exchange::Error(m) => m.set_answer(Ok(())),
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152 Exchange::Info(m) => m.set_answer(Ok(())),
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153 Exchange::RadioPrompt(qa) => fill_text!(qa, resp),
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154 Exchange::BinaryPrompt(qa) => {
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155 let bin_resp = unsafe { BinaryAnswer::upcast(resp) };
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156 qa.set_answer(Ok(bin_resp
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157 .contents()
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158 .map(|d| d.into())
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159 .unwrap_or_default()));
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160 bin_resp.zero_contents()
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161 }
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162 }
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163 }