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annotate libpam-sys/src/lib.rs @ 138:999bf07efbcb

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Get rid of num_enum dependency in `libpam-sys-helpers`. Build times now fast!
author Paul Fisher <paul@pfish.zone>
date Thu, 03 Jul 2025 20:55:40 -0400
parents 88627c057709
children 4b3a5095f68c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 //! `libpam-sys` provides low-level access to `libpam`.
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2 //!
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3 //! Everything in here is directly as exported from the `libpam` library or
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4 //! its header files, with limited exceptions:
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5 //!
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6 //! - The [`pam_impl`] submodule (and the [`pam_impl_name!`] macro) contains
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7 //! tools for detecting the current PAM library.
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8 //! - [`AppData`] is an opaque pointer newtype.
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9 //! - [`ConversationCallback`] and [`CleanupCallback`] are aliases for
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10 //! what are otherwise anonymous function types.
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11 //!
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12 #![doc = concat!("This documentation was built for the **", pam_impl_name!(), "** implementation.")]
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13 //!
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14 //! You can override this **at build time** by setting the `LIBPAMSYS_IMPL`
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15 //! environment variable to one of the values of the [`pam_impl::PamImpl`] enum.
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16 //!
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17 //! For more information about configuration, see [the README](https://crates.io/crate/libpam-sys).
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18 #![allow(non_camel_case_types)]
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19 #![allow(unused_imports)]
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20
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21 #[doc(inline)]
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22 pub use libpam_sys_helpers::constants::*;
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23 #[doc(inline)]
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24 pub use libpam_sys_helpers::{pam_impl, pam_impl_name};
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25 use std::ffi::{c_char, c_int, c_uint, c_void};
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26 use std::fmt;
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27 use std::marker::{PhantomData, PhantomPinned};
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28
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29 /// A marker struct to make whatever it's in `!Sync`, `!Send`, and `!Unpin`.
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30 #[derive(Default, PartialOrd, PartialEq, Ord, Eq)]
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31 #[repr(C)]
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32 struct ExtremelyUnsafe {
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33 _value: (),
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34 _marker: PhantomData<(PhantomPinned, *mut c_void)>,
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35 }
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36
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37 impl fmt::Debug for ExtremelyUnsafe {
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38 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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39 write!(f, "ExtremelyUnsafe({self:p})")
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40 }
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41 }
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42
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43 /// An opaque structure that PAM uses to communicate.
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44 ///
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45 /// This is only ever returned in pointer form and cannot be constructed.
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46 #[repr(C)]
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47 pub struct pam_handle(ExtremelyUnsafe);
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48
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49 impl fmt::Debug for pam_handle {
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50 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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51 write!(f, "pam_handle({self:p}")
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52 }
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53 }
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54
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55 /// An opaque structure that is passed through PAM in a conversation.
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56 #[repr(C)]
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57 pub struct AppData(ExtremelyUnsafe);
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58
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59 impl fmt::Debug for AppData {
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60 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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61 write!(f, "AppData({self:p}")
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62 }
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63 }
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64
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65 /// Just an alias for the type of [`pam_conv::conv`].
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66 ///
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67 /// For important details about the format of `messages`,
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68 /// see [`libpam_sys_helpers::memory::PtrPtrVec`].
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69 ///
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70 /// ```no_run
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71 /// # use libpam_sys::{ConversationCallback, pam_conv};
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72 /// fn convo() -> ConversationCallback {
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73 /// // ...
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74 /// # unimplemented!()
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75 /// }
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76 /// let conv = pam_conv{conv: convo(), appdata_ptr: std::ptr::null_mut()};
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77 /// ```
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78 pub type ConversationCallback = unsafe extern "C" fn(
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79 num_msg: c_int,
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80 msg: *const *const pam_message,
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81 resp: *mut *mut pam_response,
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82 appdata: *mut AppData,
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83 ) -> c_int;
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84
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85 /// Alias for the callback to [`pam_set_data`].
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86 ///
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87 /// ```no_run
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88 /// # use std::ffi::CString;
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89 /// use libpam_sys::{CleanupCallback, pam_set_data};
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90 /// # use libpam_sys::pam_handle;
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91 /// # let handle: *mut pam_handle = std::ptr::null_mut();
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92 /// # let mut my_data = 100;
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93 /// # let data_ptr = &mut my_data as *mut i32;
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94 /// fn cleanup() -> CleanupCallback {
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95 /// // ...
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96 /// # unimplemented!()
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97 /// }
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98 /// let name = CString::new("name").unwrap();
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99 /// unsafe {
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100 /// pam_set_data(handle, name.as_ptr().cast_mut(), data_ptr.cast(), cleanup());
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101 /// }
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102 /// ```
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103 pub type CleanupCallback =
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104 unsafe extern "C" fn(pamh: *mut pam_handle, data: *mut c_void, pam_end_status: c_int);
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105
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106 /// Used by PAM to communicate between the module and the application.
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107 #[repr(C)]
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108 pub struct pam_conv {
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109 pub conv: unsafe extern "C" fn(
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110 num_msg: c_int,
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111 msg: *const *const pam_message,
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112 resp: *mut *mut pam_response,
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113 appdata: *mut AppData,
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114 ) -> c_int,
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115 pub appdata_ptr: *mut AppData,
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116 }
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117
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118 /// A message sent into a PAM conversation.
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119 #[repr(C)]
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120 pub struct pam_message {
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121 pub msg_style: c_int,
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122 pub msg: *const c_char,
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123 }
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124
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125 /// A response returned from a PAM conversation.
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126 #[repr(C)]
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127 pub struct pam_response {
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128 pub resp: *mut c_char,
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129 /// Completely unused.
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130 pub resp_retcode: c_int,
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131 }
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132
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133 /// Definition of the PAM_XAUTHDATA item. Compatible with `xcb_auth_info_t`.
134
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134 #[cfg(pam_impl = "LinuxPam")]
131
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135 #[repr(C)]
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136 pub struct pam_xauth_data {
136
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137 pub namelen: c_int,
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138 pub name: *mut c_char,
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139 pub datalen: c_int,
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140 pub data: *mut c_char,
131
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141 }
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142
134
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143 #[cfg(pam_impl = "LinuxPam")]
131
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144 #[derive(Debug)]
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145 #[repr(C)]
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146 pub struct pam_modutil_privs {
136
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147 pub grplist: *mut libc::gid_t,
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148 pub number_of_groups: c_int,
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149 pub allocated: c_int,
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150 pub old_gid: libc::gid_t,
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151 pub old_uid: libc::uid_t,
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152 pub is_dropped: c_int,
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153 }
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154
134
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155 #[cfg(pam_impl = "OpenPam")]
133
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156 pub type pam_func_t = unsafe extern "C" fn(
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157 handle: *mut pam_handle,
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158 flags: c_int,
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159 argc: c_int,
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160 argv: *const *const c_char,
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161 ) -> c_int;
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162
134
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163 #[cfg(pam_impl = "OpenPam")]
133
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164 #[derive(Debug)]
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165 #[repr(C)]
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166 pub struct pam_module {
136
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167 pub path: *mut c_char,
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168 pub func: [pam_func_t; 6],
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169 pub dlh: *mut c_void,
133
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170 }
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171
137
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172 #[cfg(any(pam_impl = "OpenPam", pam_impl = "Sun"))]
133
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173 #[derive(Debug)]
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174 #[repr(C)]
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175 pub struct pam_repository {
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176 pub type_: *mut c_char,
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177 pub scope: *mut c_void,
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178 pub scope_len: usize,
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179 }
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180
127
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181 // These are the functions specified in X/SSO. Everybody exports them.
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182 #[link(name = "pam")]
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183 extern "C" {
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184 /// Account validation.
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185 pub fn pam_acct_mgmt(pamh: *mut pam_handle, flags: c_int) -> c_int;
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186
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187 /// Authenticate a user.
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188 pub fn pam_authenticate(pamh: *mut pam_handle, flags: c_int) -> c_int;
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189
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190 // Nobody implements pam_authenticate_secondary.
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191
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192 /// Manage authentication tokens.
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193 pub fn pam_chauthtok(pamh: *mut pam_handle, flags: c_int) -> c_int;
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194
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195 /// Close an opened user session.
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196 pub fn pam_close_session(pamh: *mut pam_handle, flags: c_int) -> c_int;
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197
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198 /// Ends the PAM transaction.
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199 pub fn pam_end(pamh: *mut pam_handle, flags: c_int) -> c_int;
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200
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201 /// Gets module-specific data. PAM still owns the data.
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202 pub fn pam_get_data(
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203 pamh: *mut pam_handle,
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204 module_data_name: *const c_char,
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205 data: *mut *const c_void,
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206 ) -> c_int;
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207
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208 /// Gets an environment variable. You own the return value.
130
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209 pub fn pam_getenv(pamh: *const pam_handle, name: *const c_char) -> *mut c_char;
127
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210
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211 /// Gets all the environment variables. You own everything it points to.
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212 pub fn pam_getenvlist(pamh: *const pam_handle) -> *mut *mut c_char;
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213
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214 /// Get information about the transaction.
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215 ///
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216 /// The item is owned by PAM.
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217 pub fn pam_get_item(
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218 pamh: *const pam_handle,
127
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219 item_type: c_int,
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220 item: *mut *const c_void,
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221 ) -> c_int;
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222
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223 // Nobody implements pam_get_mapped_authtok.
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224 // Nobody implements pam_get_mapped_username.
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225
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226 /// Get the username. PAM owns it.
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227 pub fn pam_get_user(
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228 pamh: *mut pam_handle,
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229 user: *mut *const c_char,
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230 prompt: *const c_char,
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231 ) -> c_int;
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232
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233 /// Opens a user session.
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234 pub fn pam_open_session(pamh: *mut pam_handle, flags: c_int) -> c_int;
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235
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236 /// Sets the value of an environment variable. `namevalue` is copied.
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237 pub fn pam_putenv(pamh: *mut pam_handle, namevalue: *const c_char) -> c_int;
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238
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239 /// Update or delete user credentials.
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240 pub fn pam_setcred(pamh: *mut pam_handle, flags: c_int) -> c_int;
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241
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242 /// Set module-specific data. PAM will call `cleanup` when completed.
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243 pub fn pam_set_data(
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244 pamh: *mut pam_handle,
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245 module_data_name: *const c_char,
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246 data: *mut c_void,
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247 cleanup: unsafe extern "C" fn(
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248 pamh: *mut pam_handle,
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249 data: *mut c_void,
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250 pam_end_status: c_int,
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251 ),
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252 ) -> c_int;
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253
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254 /// Set information about the transaction. The `item` is copied.
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255 pub fn pam_set_item(pamh: *mut pam_handle, item_type: c_int, item: *const c_void) -> c_int;
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256
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257 // Nobody implements pam_set_mapped_authtok.
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258 // Nobody implements pam_set_mapped_username.
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259
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260 // The pam_sm_whatever functions are prototypes for the functions that
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261 // a PAM module should implement, not symbols provided by PAM.
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262
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263 // Nobody implements pam_authenticate_secondary.
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264
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265 /// Starts a PAM transaction. The `conv` may or may not be copied.
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266 pub fn pam_start(
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267 service: *const c_char,
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268 user: *const c_char,
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269 pam_conv: *mut pam_conv,
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270 pamh: *mut *mut pam_handle,
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271 ) -> c_int;
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272
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273 /// Gets a statically-allocated error string.
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274 ///
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275 /// All implementations of PAM known to this library (Linux-PAM, OpenPAM,
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276 /// and Sun) ignore `pamh` and will accept a null pointer.
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277 pub fn pam_strerror(pamh: *const pam_handle, error_number: c_int) -> *mut c_char;
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278 }
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279
134
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280 #[cfg(any(pam_impl = "LinuxPam", pam_impl = "OpenPam"))]
127
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281 extern "C" {
131
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282 /// Gets `PAM_AUTHTOK`, or asks the user if that is unset.
130
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283 pub fn pam_get_authtok(
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284 pamh: *mut pam_handle,
131
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285 item: c_int,
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286 authtok: *mut *const c_char,
130
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287 prompt: *const c_char,
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288 ) -> c_int;
133
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289
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290 pub fn pam_prompt(
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291 pamh: *const pam_handle,
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292 style: c_int,
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293 response: *mut *mut c_char,
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294 fmt: *const c_char,
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295 ...
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296 ) -> c_int;
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297
127
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298 }
131
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299
134
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300 #[cfg(pam_impl = "LinuxPam")]
131
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301 extern "C" {
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302 pub fn pam_fail_delay(pamh: *mut pam_handle, musec_delay: c_uint) -> c_int;
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303
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304 /// Start a PAM transaction based on configuration in the given directory.
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305 pub fn pam_start_confdir(
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306 service_name: *const c_char,
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307 user: *const c_char,
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308 pam_conversation: *mut pam_conv,
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309 confdir: *const c_char,
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310 pamh: *mut *mut pam_handle,
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311 ) -> c_int;
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312
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313 // We don't export the v-variants of the formatting functions.
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314
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315 pub fn pam_syslog(pamh: *const pam_handle, priority: c_int, fmt: *const c_char, ...);
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316
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317 pub fn pam_get_authtok_noverify(
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318 pamh: *const pam_handle,
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319 authtok: *mut *const c_char,
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320 prompt: *const c_char,
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321 ) -> c_int;
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322
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323 pub fn pam_get_authtok_verify(
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324 pamh: *const pam_handle,
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325 authtok: *mut *const c_char,
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326 prompt: *const c_char,
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327 ) -> c_int;
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328
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329 // pam_modutil also lives in libpam for Linux.
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330
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331 pub fn pam_modutil_check_user_in_passwd(
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332 pamh: *mut pam_handle,
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333 user_name: *const c_char,
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334 file_name: *const c_char,
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335 ) -> c_int;
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336
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337 pub fn pam_modutil_getpwnam(pamh: *mut pam_handle, user: *const c_char) -> *mut libc::passwd;
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338
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339 pub fn pam_modutil_getpwuid(pamh: *mut pam_handle, uid: libc::uid_t) -> *mut libc::passwd;
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340
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341 pub fn pam_modutil_getgrnam(pamh: *mut pam_handle, group: *const c_char) -> *mut libc::group;
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342
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343 pub fn pam_modutil_getgrgid(pamh: *mut pam_handle, gid: libc::gid_t) -> *mut libc::group;
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344
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345 pub fn pam_modutil_getspnam(pamh: *mut pam_handle, user: *const c_char) -> *mut libc::spwd;
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346
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347 pub fn pam_modutil_user_in_group_nam_nam(
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348 pamh: *mut pam_handle,
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349 user: *const c_char,
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350 group: *const c_char,
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351 ) -> c_int;
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352 pub fn pam_modutil_user_in_group_nam_gid(
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353 pamh: *mut pam_handle,
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354 user: *const c_char,
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355 group: libc::gid_t,
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356 ) -> c_int;
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357
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358 pub fn pam_modutil_user_in_group_uid_nam(
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359 pamh: *mut pam_handle,
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360 user: libc::uid_t,
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361 group: *const c_char,
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362 ) -> c_int;
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363
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364 pub fn pam_modutil_user_in_group_uid_gid(
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365 pamh: *mut pam_handle,
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366 user: libc::uid_t,
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367 group: libc::gid_t,
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368 ) -> c_int;
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369
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370 pub fn pam_modutil_getlogin(pamh: *mut pam_handle) -> *const c_char;
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371
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372 pub fn pam_modutil_read(fd: c_int, buffer: *mut c_char, count: c_int) -> c_int;
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373
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374 pub fn pam_modutil_write(fd: c_int, buffer: *const c_char, count: c_int) -> c_int;
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375
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376 pub fn pam_modutil_audit_write(
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377 pamh: *mut pam_handle,
137
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378 type_: c_int,
131
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379 message: *const c_char,
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380 retval: c_int,
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diff changeset
381 ) -> c_int;
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382
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383 pub fn pam_modutil_drop_priv(
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384 pamh: *mut pam_handle,
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385 p: *mut pam_modutil_privs,
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386 pw: *const libc::passwd,
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diff changeset
387 ) -> c_int;
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diff changeset
388
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389 pub fn pam_modutil_regain_priv(pamh: *mut pam_handle, p: *mut pam_modutil_privs) -> c_int;
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diff changeset
390
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391 pub fn pam_modutil_sanitize_helper_fds(
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392 pamh: *mut pam_handle,
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393 redirect_stdin: pam_modutil_redirect_fd,
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394 redirect_stdout: pam_modutil_redirect_fd,
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395 redirect_stderr: pam_modutil_redirect_fd,
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parents: 130
diff changeset
396 ) -> c_int;
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diff changeset
397
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diff changeset
398 pub fn pam_modutil_search_key(
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parents: 130
diff changeset
399 pamh: *mut pam_handle,
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diff changeset
400 file_name: *const c_char,
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401 key: *const c_char,
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parents: 130
diff changeset
402 ) -> *mut c_char;
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diff changeset
403 }
133
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parents: 131
diff changeset
404
134
6c1e1bdb4164 Use standard #[cfg] directives rather than custom proc macros.
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parents: 133
diff changeset
405 #[cfg(pam_impl = "OpenPam")]
133
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parents: 131
diff changeset
406 extern "C" {
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parents: 131
diff changeset
407 pub fn openpam_borrow_cred(pamh: *mut pam_handle, passwd: *const libc::passwd) -> c_int;
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parents: 131
diff changeset
408
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parents: 131
diff changeset
409 pub fn openpam_subst(
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parents: 131
diff changeset
410 pamh: *const pam_handle,
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parents: 131
diff changeset
411 buf: *mut c_char,
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412 _bufsize: *mut usize,
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413 _template: *const c_char,
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414 ) -> c_int;
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415
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416 pub fn openpam_free_data(pamh: *mut pam_handle, data: *mut c_void, status: c_int);
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417
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418 pub fn openpam_free_envlist(_envlist: *mut *mut c_char);
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419
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420 pub fn openpam_get_option(_pamh: *mut pam_handle, _option: *const c_char) -> *const c_char;
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421
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422 pub fn openpam_restore_cred(pamh: *mut pam_handle) -> c_int;
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423
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424 pub fn openpam_set_option(
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425 _pamh: *mut pam_handle,
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426 _option: *const c_char,
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427 _value: *const c_char,
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428 ) -> c_int;
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429
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430 pub fn pam_error(pamh: *const pam_handle, _fmt: *const c_char, ...) -> c_int;
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431
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432 pub fn pam_info(_pamh: *const pam_handle, _fmt: *const c_char, ...) -> c_int;
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433
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434 pub fn openpam_readline(
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435 _f: *mut libc::FILE,
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436 _lineno: *mut c_int,
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437 _lenp: *mut usize,
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438 ) -> *mut c_char;
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439
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440 pub fn openpam_readlinev(
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441 _f: *mut libc::FILE,
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442 _lineno: *mut c_int,
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443 _lenp: *mut c_int,
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444 ) -> *mut *mut c_char;
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445
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446 pub fn openpam_readword(
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447 _f: *mut libc::FILE,
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448 _lineno: *mut c_int,
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449 _lenp: *mut usize,
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450 ) -> *mut c_char;
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451
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452 pub fn openpam_straddch(
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453 _str: *mut *mut c_char,
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454 _sizep: *mut usize,
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455 _lenp: *mut usize,
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456 ch: c_int,
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457 ) -> c_int;
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458
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459 pub fn openpam_set_feature(_feature: c_int, _onoff: c_int) -> c_int;
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460
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461 pub fn openpam_get_feature(_feature: c_int, _onoff: *mut c_int) -> c_int;
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462
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463 pub fn _openpam_log(_level: c_int, _func: *const c_char, _fmt: *const c_char, ...);
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464
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465 /// A premade conversation function that talks to the TTY.
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466 ///
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467 /// ```no_run
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468 /// # use std::ffi::CString;
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469 /// # use std::ptr;
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470 /// use libpam_sys::*;
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471 /// # let service = CString::new("whatever").unwrap();
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472 /// # let user = CString::new("whatever").unwrap();
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473 /// let mut handle: *mut pam_handle = ptr::null_mut();
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474 /// let mut conv = pam_conv{
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475 /// conv: openpam_ttyconv,
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476 /// appdata_ptr: ptr::null_mut(),
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477 /// };
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478 /// let result = unsafe { pam_start(
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479 /// service.as_ptr(), user.as_ptr(), &mut conv, &mut handle
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480 /// ) };
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481 /// ```
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482 pub fn openpam_ttyconv(
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483 n: c_int,
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484 _msg: *const *const pam_message,
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485 _resp: *mut *mut pam_response,
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486 _data: *mut AppData,
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487 ) -> c_int;
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488
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489 pub static mut openpam_ttyconv_timeout: c_int;
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490
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491 /// A null conversation function.
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492 ///
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493 /// ```no_run
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494 /// # use std::ffi::CString;
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495 /// # use std::ptr;
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496 /// use libpam_sys::*;
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497 /// # let service = CString::new("whatever").unwrap();
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498 /// # let user = CString::new("whatever").unwrap();
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499 /// let mut handle: *mut pam_handle = ptr::null_mut();
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500 /// let mut conv = pam_conv{
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501 /// conv: openpam_nullconv,
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502 /// appdata_ptr: ptr::null_mut(),
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503 /// };
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504 /// let result = unsafe { pam_start(
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505 /// service.as_ptr(), user.as_ptr(), &mut conv, &mut handle
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506 /// ) };
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507 /// ```
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508 pub fn openpam_nullconv(
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509 n: c_int,
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510 _msg: *const *const pam_message,
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511 _resp: *mut *mut pam_response,
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512 _data: *mut AppData,
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513 ) -> c_int;
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514 }
137
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515
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516 #[cfg(pam_impl = "Sun")]
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517 extern "C" {
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518 pub fn __pam_get_authtok(
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519 pamh: *mut pam_handle,
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520 source: c_int,
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521 type_: c_int,
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522 prompt: *const c_char,
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523 authtok: *mut *mut c_char,
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524 ) -> c_int;
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525
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526 pub fn __pam_log(priority: c_int, format: *const c_char, ...);
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527 }