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annotate src/libpam/conversation.rs @ 75:c30811b4afae

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rename pam_ffi submodule to libpam.
author Paul Fisher <paul@pfish.zone>
date Fri, 06 Jun 2025 22:35:08 -0400
parents src/pam_ffi/conversation.rs@c7c596e6388f
children 351bdc13005e
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1 use crate::constants::Result;
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2 use crate::conv::{Conversation, Message, Response};
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c30811b4afae rename pam_ffi submodule to libpam.
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3 use crate::libpam::memory::Immovable;
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4 use crate::libpam::message::{MessageIndirector, OwnedMessages};
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5 use crate::libpam::response::{OwnedResponses, RawBinaryResponse, RawResponse, RawTextResponse};
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6 use crate::ErrorCode;
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7 use crate::ErrorCode::ConversationError;
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8 use std::ffi::c_int;
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9 use std::iter;
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10 use std::marker::PhantomData;
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11 use std::result::Result as StdResult;
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12
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13 /// An opaque structure that is passed through PAM in a conversation.
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14 #[repr(C)]
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15 pub struct AppData {
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16 _data: (),
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17 _marker: Immovable,
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18 }
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19
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20 /// The callback that PAM uses to get information in a conversation.
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21 ///
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22 /// - `num_msg` is the number of messages in the `pam_message` array.
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23 /// - `messages` is a pointer to the messages being sent to the user.
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24 /// For details about its structure, see the documentation of
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25 /// [`OwnedMessages`](super::OwnedMessages).
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26 /// - `responses` is a pointer to an array of [`RawResponse`]s,
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27 /// which PAM sets in response to a module's request.
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28 /// This is an array of structs, not an array of pointers to a struct.
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29 /// There should always be exactly as many `responses` as `num_msg`.
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30 /// - `appdata` is the `appdata` field of the [`LibPamConversation`] we were passed.
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31 pub type ConversationCallback = unsafe extern "C" fn(
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32 num_msg: c_int,
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33 messages: *const MessageIndirector,
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34 responses: *mut *mut RawResponse,
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35 appdata: *mut AppData,
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36 ) -> c_int;
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37
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38 /// The type used by PAM to call back into a conversation.
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39 #[repr(C)]
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40 pub struct LibPamConversation<'a> {
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41 /// The function that is called to get information from the user.
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42 callback: ConversationCallback,
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43 /// The pointer that will be passed as the last parameter
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44 /// to the conversation callback.
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45 appdata: *mut AppData,
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46 life: PhantomData<&'a mut ()>,
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47 _marker: Immovable,
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48 }
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49
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50 impl LibPamConversation<'_> {
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51 fn wrap<C: Conversation>(conv: &mut C) -> Self {
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52 Self {
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53 callback: Self::wrapper_callback::<C>,
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54 appdata: (conv as *mut C).cast(),
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55 life: PhantomData,
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56 _marker: Immovable(PhantomData),
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57 }
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58 }
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59
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60 unsafe extern "C" fn wrapper_callback<C: Conversation>(
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61 count: c_int,
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62 messages: *const MessageIndirector,
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63 responses: *mut *mut RawResponse,
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64 me: *mut AppData,
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65 ) -> c_int {
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66 let call = || {
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67 let conv = me
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68 .cast::<C>()
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69 .as_mut()
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70 .ok_or(ErrorCode::ConversationError)?;
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71 let indir = messages.as_ref().ok_or(ErrorCode::ConversationError)?;
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72 let response_ptr = responses.as_mut().ok_or(ErrorCode::ConversationError)?;
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73 let messages: Vec<Message> = indir
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74 .iter(count as usize)
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75 .map(Message::try_from)
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76 .collect::<StdResult<_, _>>()
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77 .map_err(|_| ErrorCode::ConversationError)?;
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78 let responses = conv.communicate(&messages)?;
73
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79 let owned =
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80 OwnedResponses::build(&responses).map_err(|_| ErrorCode::ConversationError)?;
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81 *response_ptr = owned.into_ptr();
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82 Ok(())
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83 };
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84 ErrorCode::result_to_c(call())
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85 }
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86 }
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87
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88 impl Conversation for LibPamConversation<'_> {
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89 fn communicate(&mut self, messages: &[Message]) -> Result<Vec<Response>> {
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90 let mut msgs_to_send = OwnedMessages::alloc(messages.len());
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91 for (dst, src) in iter::zip(msgs_to_send.iter_mut(), messages.iter()) {
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92 dst.set(*src).map_err(|_| ErrorCode::ConversationError)?
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93 }
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94 let mut response_pointer = std::ptr::null_mut();
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95 // SAFETY: We're calling into PAM with valid everything.
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96 let result = unsafe {
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97 (self.callback)(
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98 messages.len() as c_int,
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99 msgs_to_send.indirector(),
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100 &mut response_pointer,
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101 self.appdata,
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102 )
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103 };
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104 ErrorCode::result_from(result)?;
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105 // SAFETY: This is a pointer we just got back from PAM.
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106 let owned_responses =
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107 unsafe { OwnedResponses::from_c_heap(response_pointer, messages.len()) };
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108 convert_responses(messages, owned_responses)
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109 }
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110 }
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111
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112 fn convert_responses(
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113 messages: &[Message],
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114 mut raw_responses: OwnedResponses,
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115 ) -> Result<Vec<Response>> {
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116 let pairs = iter::zip(messages.iter(), raw_responses.iter_mut());
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117 // We first collect into a Vec of Results so that we always process
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118 // every single entry, which may involve freeing it.
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119 let responses: Vec<_> = pairs.map(convert).collect();
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120 // Only then do we return the first error, if present.
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121 responses.into_iter().collect()
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122 }
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123
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124 /// Converts one message-to-raw pair to a Response.
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125 fn convert((sent, received): (&Message, &mut RawResponse)) -> Result<Response> {
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126 Ok(match sent {
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127 Message::MaskedPrompt(_) => {
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128 // SAFETY: Since this is a response to a text message,
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129 // we know it is text.
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130 let text_resp = unsafe { RawTextResponse::upcast(received) };
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131 let ret = Response::MaskedText(
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132 text_resp
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133 .contents()
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134 .map_err(|_| ErrorCode::ConversationError)?
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135 .into(),
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136 );
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137 // SAFETY: We're the only ones using this,
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138 // and we haven't freed it.
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139 text_resp.free_contents();
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140 ret
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141 }
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142 Message::Prompt(_) | Message::RadioPrompt(_) => {
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143 // SAFETY: Since this is a response to a text message,
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144 // we know it is text.
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145 let text_resp = unsafe { RawTextResponse::upcast(received) };
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146 let ret = Response::Text(text_resp.contents().map_err(|_| ConversationError)?.into());
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147 // SAFETY: We're the only ones using this,
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148 // and we haven't freed it.
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149 text_resp.free_contents();
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150 ret
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151 }
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c7c596e6388f Make conversations type-safe (last big reorg) (REAL) (NOT CLICKBAIT)
Paul Fisher <paul@pfish.zone>
parents: 73
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152 Message::ErrorMsg(_) | Message::InfoMsg(_) => Response::NoResponse,
73
ac6881304c78 Do conversations, along with way too much stuff.
Paul Fisher <paul@pfish.zone>
parents:
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153 Message::BinaryPrompt { .. } => {
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Paul Fisher <paul@pfish.zone>
parents:
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154 let bin_resp = unsafe { RawBinaryResponse::upcast(received) };
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Paul Fisher <paul@pfish.zone>
parents:
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155 let ret = Response::Binary(bin_resp.to_owned());
ac6881304c78 Do conversations, along with way too much stuff.
Paul Fisher <paul@pfish.zone>
parents:
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156 // SAFETY: We're the only ones using this,
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Paul Fisher <paul@pfish.zone>
parents:
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157 // and we haven't freed it.
ac6881304c78 Do conversations, along with way too much stuff.
Paul Fisher <paul@pfish.zone>
parents:
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158 bin_resp.free_contents();
ac6881304c78 Do conversations, along with way too much stuff.
Paul Fisher <paul@pfish.zone>
parents:
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159 ret
ac6881304c78 Do conversations, along with way too much stuff.
Paul Fisher <paul@pfish.zone>
parents:
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160 }
ac6881304c78 Do conversations, along with way too much stuff.
Paul Fisher <paul@pfish.zone>
parents:
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161 })
ac6881304c78 Do conversations, along with way too much stuff.
Paul Fisher <paul@pfish.zone>
parents:
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162 }