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annotate src/libpam/question.rs @ 80:5aa1a010f1e8

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Start using PAM headers; improve owned/borrowed distinction. - Uses bindgen to generate bindings (only if needed). - Gets the story together on owned vs. borrowed handles. - Reduces number of mutable borrows in handle operation (since `PamHandle` is neither `Send` nor `Sync`, we never have to worry about thread safety. - Improves a bunch of macros so we don't have our own special syntax for docs. - Implement question indirection for standard XSSO PAM implementations.
author Paul Fisher <paul@pfish.zone>
date Tue, 10 Jun 2025 01:09:30 -0400
parents 2128123b9406
children 5e14bb093851
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1 //! Data and types dealing with PAM messages.
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2
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3 use crate::conv::{BinaryQAndA, ErrorMsg, InfoMsg, MaskedQAndA, Message, QAndA, RadioQAndA};
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4 use crate::libpam::conversation::OwnedMessage;
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5 use crate::libpam::memory;
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6 use crate::libpam::memory::{CBinaryData, Immovable};
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7 pub use crate::libpam::pam_ffi::{Question, Style};
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8 use crate::ErrorCode;
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9 use crate::Result;
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10 use std::ffi::{c_void, CStr};
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11 use std::{iter, ptr, slice};
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12
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13 /// Abstraction of a collection of questions to be sent in a PAM conversation.
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14 ///
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15 /// The PAM C API conversation function looks like this:
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16 ///
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17 /// ```c
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18 /// int pam_conv(
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19 /// int count,
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20 /// const struct pam_message **questions,
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21 /// struct pam_response **answers,
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22 /// void *appdata_ptr,
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23 /// )
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24 /// ```
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25 ///
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26 /// On Linux-PAM and other compatible implementations, `questions`
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27 /// is treated as a pointer-to-pointers, like `int argc, char **argv`.
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28 /// (In this situation, the value of `Questions.indirect` is
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29 /// the pointer passed to `pam_conv`.)
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30 ///
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31 /// ```text
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32 /// ╔═ Questions ═╗ points to ┌─ Indirect ─┐ ╔═ Question ═╗
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33 /// ║ indirect ┄┄┄╫┄┄┄┄┄┄┄┄┄┄┄> │ base[0] ┄┄┄┼┄┄┄┄┄> ║ style ║
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34 /// ║ count ║ │ base[1] ┄┄┄┼┄┄┄╮ ║ data ┄┄┄┄┄┄╫┄┄> ...
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35 /// ╚═════════════╝ │ ... │ ┆ ╚════════════╝
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36 /// ┆
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37 /// ┆ ╔═ Question ═╗
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38 /// ╰┄┄> ║ style ║
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39 /// ║ data ┄┄┄┄┄┄╫┄┄> ...
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40 /// ╚════════════╝
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41 /// ```
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42 ///
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43 /// On OpenPAM and other compatible implementations (like Solaris),
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44 /// `messages` is a pointer-to-pointer-to-array. This appears to be
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45 /// the correct implementation as required by the XSSO specification.
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46 ///
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47 /// ```text
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48 /// ╔═ Questions ═╗ points to ┌─ Indirect ─┐ ╔═ Question[] ═╗
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49 /// ║ indirect ┄┄┄╫┄┄┄┄┄┄┄┄┄┄┄> │ base ┄┄┄┄┄┄┼┄┄┄┄┄> ║ style ║
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50 /// ║ count ║ └────────────┘ ║ data ┄┄┄┄┄┄┄┄╫┄┄> ...
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51 /// ╚═════════════╝ ╟──────────────╢
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52 /// ║ style ║
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53 /// ║ data ┄┄┄┄┄┄┄┄╫┄┄> ...
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54 /// ╟──────────────╢
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55 /// ║ ... ║
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56 /// ```
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57 pub struct GenericQuestions<I: IndirectTrait> {
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58 /// An indirection to the questions themselves, stored on the C heap.
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59 indirect: *mut I,
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60 /// The number of questions.
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61 count: usize,
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62 }
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63
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64 impl<I: IndirectTrait> GenericQuestions<I> {
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65 /// Stores the provided questions on the C heap.
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66 pub fn new(messages: &[Message]) -> Result<Self> {
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67 let count = messages.len();
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68 let mut ret = Self {
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69 indirect: I::alloc(count),
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70 count,
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71 };
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72 // Even if we fail partway through this, all our memory will be freed.
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73 for (question, message) in iter::zip(ret.iter_mut(), messages) {
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74 question.fill(message)?
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75 }
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76 Ok(ret)
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77 }
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78
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79 /// The pointer to the thing with the actual list.
80
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80 pub fn indirect(&self) -> *const *const Question {
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81 self.indirect.cast()
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82 }
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83
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84 pub fn iter(&self) -> impl Iterator<Item = &Question> {
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85 // SAFETY: we're iterating over an amount we know.
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86 unsafe { (*self.indirect).iter(self.count) }
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87 }
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88 pub fn iter_mut(&mut self) -> impl Iterator<Item = &mut Question> {
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89 // SAFETY: we're iterating over an amount we know.
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90 unsafe { (*self.indirect).iter_mut(self.count) }
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91 }
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92 }
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93
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94 impl<I: IndirectTrait> Drop for GenericQuestions<I> {
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95 fn drop(&mut self) {
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96 // SAFETY: We are valid and have a valid pointer.
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97 // Once we're done, everything will be safe.
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98 unsafe {
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99 if let Some(indirect) = self.indirect.as_mut() {
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100 indirect.free_contents(self.count)
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101 }
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102 memory::free(self.indirect);
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103 self.indirect = ptr::null_mut();
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104 }
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105 }
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106 }
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107
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108 /// The trait that each of the `Indirect` implementations implement.
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109 ///
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110 /// Basically a slice but with more meat.
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111 pub trait IndirectTrait {
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112 /// Converts a pointer into a borrowed `Self`.
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113 ///
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114 /// # Safety
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115 ///
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116 /// You have to provide a valid pointer.
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117 unsafe fn borrow_ptr<'a>(ptr: *const *const Question) -> Option<&'a Self>
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118 where
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119 Self: Sized,
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120 {
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121 ptr.cast::<Self>().as_ref()
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122 }
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123
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124 /// Allocates memory for this indirector and all its members.
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125 fn alloc(count: usize) -> *mut Self;
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126
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127 /// Returns an iterator yielding the given number of messages.
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128 ///
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129 /// # Safety
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130 ///
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131 /// You have to provide the right count.
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132 unsafe fn iter(&self, count: usize) -> impl Iterator<Item = &Question>;
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133
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134 /// Returns a mutable iterator yielding the given number of messages.
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135 ///
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136 /// # Safety
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137 ///
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138 /// You have to provide the right count.
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139 unsafe fn iter_mut(&mut self, count: usize) -> impl Iterator<Item = &mut Question>;
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140
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141 /// Frees everything this points to.
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142 ///
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143 /// # Safety
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144 ///
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145 /// You have to pass the right size.
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146 unsafe fn free_contents(&mut self, count: usize);
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147 }
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148
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149 /// An indirect reference to messages.
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150 ///
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151 /// This is kept separate to provide a place where we can separate
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152 /// the pointer-to-pointer-to-list from pointer-to-list-of-pointers.
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153 #[cfg(pam_impl = "linux-pam")]
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154 pub type Indirect = LinuxPamIndirect;
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155
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156 /// An indirect reference to messages.
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157 ///
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158 /// This is kept separate to provide a place where we can separate
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159 /// the pointer-to-pointer-to-list from pointer-to-list-of-pointers.
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160 #[cfg(not(pam_impl = "linux-pam"))]
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161 pub type Indirect = XssoIndirect;
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162
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163 pub type Questions = GenericQuestions<Indirect>;
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164
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165 /// The XSSO standard version of the indirection layer between Question and Questions.
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166 #[repr(transparent)]
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167 pub struct StandardIndirect {
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168 base: *mut Question,
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169 _marker: Immovable,
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170 }
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171
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172 impl IndirectTrait for StandardIndirect {
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173 fn alloc(count: usize) -> *mut Self {
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174 let questions = memory::calloc(count);
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175 let me_ptr: *mut Self = memory::calloc(1);
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176 // SAFETY: We just allocated this, and we're putting a valid pointer in.
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177 unsafe {
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178 let me = &mut *me_ptr;
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179 me.base = questions;
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180 }
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181 me_ptr
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182 }
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183
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184 unsafe fn iter(&self, count: usize) -> impl Iterator<Item = &Question> {
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185 (0..count).map(|idx| &*self.base.add(idx))
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186 }
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187
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188 unsafe fn iter_mut(&mut self, count: usize) -> impl Iterator<Item = &mut Question> {
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189 (0..count).map(|idx| &mut *self.base.add(idx))
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190 }
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191
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192 unsafe fn free_contents(&mut self, count: usize) {
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193 let msgs = slice::from_raw_parts_mut(self.base, count);
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194 for msg in msgs {
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195 msg.clear()
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196 }
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197 memory::free(self.base);
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198 self.base = ptr::null_mut()
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199 }
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200 }
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201
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202 /// The Linux version of the indirection layer between Question and Questions.
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203 #[repr(transparent)]
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204 pub struct LinuxPamIndirect {
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205 base: [*mut Question; 0],
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206 _marker: Immovable,
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207 }
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208
80
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209 impl IndirectTrait for LinuxPamIndirect {
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210 fn alloc(count: usize) -> *mut Self {
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211 // SAFETY: We're only allocating, and when we're done,
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212 // everything will be in a known-good state.
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213 let me_ptr: *mut Self = memory::calloc::<*mut Question>(count).cast();
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214 unsafe {
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215 let me = &mut *me_ptr;
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216 let ptr_list = slice::from_raw_parts_mut(me.base.as_mut_ptr(), count);
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217 for entry in ptr_list {
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218 *entry = memory::calloc(1);
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219 }
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220 }
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221 me_ptr
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222 }
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223
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224 unsafe fn iter(&self, count: usize) -> impl Iterator<Item = &Question> {
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225 (0..count).map(|idx| &**self.base.as_ptr().add(idx))
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226 }
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227
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228 unsafe fn iter_mut(&mut self, count: usize) -> impl Iterator<Item = &mut Question> {
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229 (0..count).map(|idx| &mut **self.base.as_mut_ptr().add(idx))
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230 }
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231
80
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232 unsafe fn free_contents(&mut self, count: usize) {
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233 let msgs = slice::from_raw_parts_mut(self.base.as_mut_ptr(), count);
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234 for msg in msgs {
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235 if let Some(msg) = msg.as_mut() {
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236 msg.clear();
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237 }
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238 memory::free(*msg);
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239 *msg = ptr::null_mut();
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240 }
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241 }
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242 }
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243
80
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244 impl Default for Question {
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245 fn default() -> Self {
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246 Self {
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247 style: Default::default(),
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248 data: ptr::null_mut(),
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249 _marker: Default::default(),
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250 }
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251 }
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252 }
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253
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254 impl Question {
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255 /// Replaces the contents of this question with the question
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256 /// from the message.
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257 pub fn fill(&mut self, msg: &Message) -> Result<()> {
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258 let (style, data) = copy_to_heap(msg)?;
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259 self.clear();
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260 self.style = style.into();
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261 self.data = data;
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262 Ok(())
69
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263 }
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264
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265 /// Gets this message's data pointer as a string.
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266 ///
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267 /// # Safety
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268 ///
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269 /// It's up to you to pass this only on types with a string value.
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270 unsafe fn string_data(&self) -> Result<&str> {
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271 if self.data.is_null() {
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272 Ok("")
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273 } else {
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274 CStr::from_ptr(self.data.cast())
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275 .to_str()
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276 .map_err(|_| ErrorCode::ConversationError)
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277 }
69
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278 }
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279
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280 /// Gets this message's data pointer as borrowed binary data.
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281 unsafe fn binary_data(&self) -> (&[u8], u8) {
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282 self.data
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283 .cast::<CBinaryData>()
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284 .as_ref()
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285 .map(Into::into)
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286 .unwrap_or_default()
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287 }
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288
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289 /// Zeroes out the data stored here.
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290 fn clear(&mut self) {
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291 // SAFETY: We either created this data or we got it from PAM.
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292 // After this function is done, it will be zeroed out.
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293 unsafe {
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294 if let Ok(style) = Style::try_from(self.style) {
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295 match style {
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296 Style::BinaryPrompt => {
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297 if let Some(d) = self.data.cast::<CBinaryData>().as_mut() {
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298 d.zero_contents()
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299 }
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300 }
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301 Style::TextInfo
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302 | Style::RadioType
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303 | Style::ErrorMsg
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304 | Style::PromptEchoOff
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305 | Style::PromptEchoOn => memory::zero_c_string(self.data.cast()),
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306 }
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307 };
78
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308 memory::free(self.data);
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309 self.data = ptr::null_mut();
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310 }
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311 }
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312 }
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313
77
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314 impl<'a> TryFrom<&'a Question> for OwnedMessage<'a> {
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315 type Error = ErrorCode;
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316 fn try_from(question: &'a Question) -> Result<Self> {
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317 let style: Style = question
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318 .style
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319 .try_into()
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320 .map_err(|_| ErrorCode::ConversationError)?;
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321 // SAFETY: In all cases below, we're matching the
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322 let prompt = unsafe {
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323 match style {
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324 Style::PromptEchoOff => {
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325 Self::MaskedPrompt(MaskedQAndA::new(question.string_data()?))
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326 }
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327 Style::PromptEchoOn => Self::Prompt(QAndA::new(question.string_data()?)),
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328 Style::ErrorMsg => Self::Error(ErrorMsg::new(question.string_data()?)),
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329 Style::TextInfo => Self::Info(InfoMsg::new(question.string_data()?)),
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330 Style::RadioType => Self::RadioPrompt(RadioQAndA::new(question.string_data()?)),
78
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331 Style::BinaryPrompt => Self::BinaryPrompt(BinaryQAndA::new(question.binary_data())),
77
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332 }
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333 };
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334 Ok(prompt)
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335 }
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336 }
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337
77
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338 /// Copies the contents of this message to the C heap.
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339 fn copy_to_heap(msg: &Message) -> Result<(Style, *mut c_void)> {
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340 let alloc = |style, text| Ok((style, memory::malloc_str(text)?.cast()));
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341 match *msg {
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342 Message::MaskedPrompt(p) => alloc(Style::PromptEchoOff, p.question()),
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343 Message::Prompt(p) => alloc(Style::PromptEchoOn, p.question()),
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344 Message::RadioPrompt(p) => alloc(Style::RadioType, p.question()),
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345 Message::Error(p) => alloc(Style::ErrorMsg, p.question()),
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346 Message::Info(p) => alloc(Style::TextInfo, p.question()),
79
2128123b9406 Format (oops!) and make some fun and/or stupid conversions available.
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diff changeset
347 Message::BinaryPrompt(p) => Ok((
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diff changeset
348 Style::BinaryPrompt,
2128123b9406 Format (oops!) and make some fun and/or stupid conversions available.
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diff changeset
349 CBinaryData::alloc(p.question())?.cast(),
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diff changeset
350 )),
77
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351 }
351bdc13005e Update the libpam module to work with the new structure.
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352 }
351bdc13005e Update the libpam module to work with the new structure.
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353
73
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diff changeset
354 #[cfg(test)]
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diff changeset
355 mod tests {
78
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diff changeset
356
80
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diff changeset
357 use super::{
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diff changeset
358 BinaryQAndA, ErrorMsg, GenericQuestions, IndirectTrait, InfoMsg, LinuxPamIndirect,
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diff changeset
359 MaskedQAndA, OwnedMessage, QAndA, RadioQAndA, Result, StandardIndirect,
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diff changeset
360 };
71
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diff changeset
361
80
5aa1a010f1e8 Start using PAM headers; improve owned/borrowed distinction.
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parents: 79
diff changeset
362 macro_rules! assert_matches {
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diff changeset
363 ($id:ident => $variant:path, $q:expr) => {
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diff changeset
364 if let $variant($id) = $id {
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parents: 79
diff changeset
365 assert_eq!($q, $id.question());
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diff changeset
366 } else {
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diff changeset
367 panic!("mismatched enum variant {x:?}", x = $id);
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diff changeset
368 }
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parents: 79
diff changeset
369 };
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diff changeset
370 }
78
002adfb98c5c Rename files, reorder structs, remove annoying BorrowedBinaryData type.
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parents: 77
diff changeset
371
80
5aa1a010f1e8 Start using PAM headers; improve owned/borrowed distinction.
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parents: 79
diff changeset
372 macro_rules! tests { ($fn_name:ident<$typ:ident>) => {
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diff changeset
373 #[test]
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diff changeset
374 fn $fn_name() {
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diff changeset
375 let interrogation = GenericQuestions::<$typ>::new(&[
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diff changeset
376 MaskedQAndA::new("hocus pocus").message(),
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diff changeset
377 BinaryQAndA::new((&[5, 4, 3, 2, 1], 66)).message(),
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diff changeset
378 QAndA::new("what").message(),
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diff changeset
379 QAndA::new("who").message(),
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diff changeset
380 InfoMsg::new("hey").message(),
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diff changeset
381 ErrorMsg::new("gasp").message(),
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diff changeset
382 RadioQAndA::new("you must choose").message(),
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diff changeset
383 ])
77
351bdc13005e Update the libpam module to work with the new structure.
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diff changeset
384 .unwrap();
80
5aa1a010f1e8 Start using PAM headers; improve owned/borrowed distinction.
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parents: 79
diff changeset
385 let indirect = interrogation.indirect();
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parents: 79
diff changeset
386
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diff changeset
387 let remade = unsafe { $typ::borrow_ptr(indirect) }.unwrap();
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diff changeset
388 let messages: Vec<OwnedMessage> = unsafe { remade.iter(interrogation.count) }
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diff changeset
389 .map(TryInto::try_into)
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diff changeset
390 .collect::<Result<_>>()
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diff changeset
391 .unwrap();
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diff changeset
392 let [masked, bin, what, who, hey, gasp, choose] = messages.try_into().unwrap();
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diff changeset
393 assert_matches!(masked => OwnedMessage::MaskedPrompt, "hocus pocus");
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diff changeset
394 assert_matches!(bin => OwnedMessage::BinaryPrompt, (&[5, 4, 3, 2, 1][..], 66));
5aa1a010f1e8 Start using PAM headers; improve owned/borrowed distinction.
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parents: 79
diff changeset
395 assert_matches!(what => OwnedMessage::Prompt, "what");
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diff changeset
396 assert_matches!(who => OwnedMessage::Prompt, "who");
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diff changeset
397 assert_matches!(hey => OwnedMessage::Info, "hey");
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parents: 79
diff changeset
398 assert_matches!(gasp => OwnedMessage::Error, "gasp");
5aa1a010f1e8 Start using PAM headers; improve owned/borrowed distinction.
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parents: 79
diff changeset
399 assert_matches!(choose => OwnedMessage::RadioPrompt, "you must choose");
78
002adfb98c5c Rename files, reorder structs, remove annoying BorrowedBinaryData type.
Paul Fisher <paul@pfish.zone>
parents: 77
diff changeset
400 }
80
5aa1a010f1e8 Start using PAM headers; improve owned/borrowed distinction.
Paul Fisher <paul@pfish.zone>
parents: 79
diff changeset
401 }}
5aa1a010f1e8 Start using PAM headers; improve owned/borrowed distinction.
Paul Fisher <paul@pfish.zone>
parents: 79
diff changeset
402
5aa1a010f1e8 Start using PAM headers; improve owned/borrowed distinction.
Paul Fisher <paul@pfish.zone>
parents: 79
diff changeset
403 tests!(test_xsso<StandardIndirect>);
5aa1a010f1e8 Start using PAM headers; improve owned/borrowed distinction.
Paul Fisher <paul@pfish.zone>
parents: 79
diff changeset
404 tests!(test_linux<LinuxPamIndirect>);
69
8f3ae0c7ab92 Rework conversation data types and make safe wrappers.
Paul Fisher <paul@pfish.zone>
parents: 66
diff changeset
405 }