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annotate libpam-sys/src/lib.rs @ 136:efbc235f01d3

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Separate libpam-sys-helpers from libpam-sys. This separates the parts of libpam-sys that don't need linking against libpam from the parts that do need to link against libpam.
author Paul Fisher <paul@pfish.zone>
date Thu, 03 Jul 2025 14:28:04 -0400
parents libpam-sys/src/ffi.rs@6c1e1bdb4164
children 88627c057709
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 num_enum::{IntoPrimitive, TryFromPrimitive};
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26 use std::ffi::{c_char, c_int, c_uint, c_void};
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27 use std::fmt;
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28 use std::marker::{PhantomData, PhantomPinned};
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29
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30 /// A marker struct to make whatever it's in `!Sync`, `!Send`, and `!Unpin`.
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31 #[derive(Default, PartialOrd, PartialEq, Ord, Eq)]
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32 #[repr(C)]
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33 struct ExtremelyUnsafe {
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34 _value: (),
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35 _marker: PhantomData<(PhantomPinned, *mut c_void)>,
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36 }
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37
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38 impl fmt::Debug for ExtremelyUnsafe {
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39 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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40 write!(f, "ExtremelyUnsafe({self:p})")
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41 }
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42 }
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43
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44 /// An opaque structure that PAM uses to communicate.
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45 ///
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46 /// This is only ever returned in pointer form and cannot be constructed.
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47 #[repr(C)]
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48 pub struct pam_handle(ExtremelyUnsafe);
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49
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50 impl fmt::Debug for pam_handle {
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51 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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52 write!(f, "pam_handle({self:p}")
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53 }
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54 }
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55
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56 /// An opaque structure that is passed through PAM in a conversation.
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57 #[repr(C)]
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58 pub struct AppData(ExtremelyUnsafe);
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59
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60 impl fmt::Debug for AppData {
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61 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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62 write!(f, "AppData({self:p}")
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63 }
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64 }
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65
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66 /// Just an alias for the type of [`pam_conv::conv`].
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67 ///
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68 /// For important details about the format of `messages`,
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69 /// see [`libpam_sys_helpers::memory::PtrPtrVec`].
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70 ///
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71 /// ```no_run
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72 /// # use libpam_sys::{ConversationCallback, pam_conv};
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73 /// fn convo() -> ConversationCallback {
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74 /// // ...
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75 /// # unimplemented!()
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76 /// }
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77 /// let conv = pam_conv{conv: convo(), appdata_ptr: std::ptr::null_mut()};
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78 /// ```
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79 pub type ConversationCallback = unsafe extern "C" fn(
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80 num_msg: c_int,
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81 msg: *const *const pam_message,
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82 resp: *mut *mut pam_response,
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83 appdata: *mut AppData,
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84 ) -> c_int;
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85
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86 /// Alias for the callback to [`pam_set_data`].
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87 ///
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88 /// ```no_run
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89 /// # use std::ffi::CString;
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90 /// use libpam_sys::{CleanupCallback, pam_set_data};
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91 /// # use libpam_sys::pam_handle;
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92 /// # let handle: *mut pam_handle = std::ptr::null_mut();
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93 /// # let mut my_data = 100;
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94 /// # let data_ptr = &mut my_data as *mut i32;
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95 /// fn cleanup() -> CleanupCallback {
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96 /// // ...
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97 /// # unimplemented!()
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98 /// }
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99 /// let name = CString::new("name").unwrap();
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100 /// unsafe {
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101 /// pam_set_data(handle, name.as_ptr().cast_mut(), data_ptr.cast(), cleanup());
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102 /// }
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103 /// ```
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104 pub type CleanupCallback =
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105 unsafe extern "C" fn(pamh: *mut pam_handle, data: *mut c_void, pam_end_status: c_int);
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106
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107 /// Used by PAM to communicate between the module and the application.
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108 #[repr(C)]
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109 pub struct pam_conv {
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110 pub conv: unsafe extern "C" fn(
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111 num_msg: c_int,
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112 msg: *const *const pam_message,
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113 resp: *mut *mut pam_response,
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114 appdata: *mut AppData,
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115 ) -> c_int,
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116 pub appdata_ptr: *mut AppData,
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117 }
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118
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119 /// A message sent into a PAM conversation.
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120 #[repr(C)]
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121 pub struct pam_message {
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122 pub msg_style: c_int,
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123 pub msg: *const c_char,
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124 }
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125
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126 /// A response returned from a PAM conversation.
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127 #[repr(C)]
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128 pub struct pam_response {
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129 pub resp: *mut c_char,
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130 /// Completely unused.
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131 pub resp_retcode: c_int,
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132 }
127
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133
131
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134 /// Definition of the PAM_XAUTHDATA item. Compatible with `xcb_auth_info_t`.
134
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135 #[cfg(pam_impl = "LinuxPam")]
131
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136 #[repr(C)]
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137 pub struct pam_xauth_data {
136
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138 pub namelen: c_int,
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139 pub name: *mut c_char,
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140 pub datalen: c_int,
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141 pub data: *mut c_char,
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142 }
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143
134
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144 #[cfg(pam_impl = "LinuxPam")]
131
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145 #[derive(Debug)]
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146 #[repr(C)]
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147 pub struct pam_modutil_privs {
136
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148 pub grplist: *mut libc::gid_t,
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149 pub number_of_groups: c_int,
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150 pub allocated: c_int,
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151 pub old_gid: libc::gid_t,
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152 pub old_uid: libc::uid_t,
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153 pub is_dropped: c_int,
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154 }
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155
134
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156 #[cfg(pam_impl = "OpenPam")]
133
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157 pub type pam_func_t = unsafe extern "C" fn(
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158 handle: *mut pam_handle,
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159 flags: c_int,
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160 argc: c_int,
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161 argv: *const *const c_char,
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162 ) -> c_int;
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163
134
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164 #[cfg(pam_impl = "OpenPam")]
133
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165 #[derive(Debug)]
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166 #[repr(C)]
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167 pub struct pam_module {
136
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168 pub path: *mut c_char,
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169 pub func: [pam_func_t; 6],
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170 pub dlh: *mut c_void,
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171 }
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172
134
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173 #[cfg(pam_impl = "OpenPam")]
133
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174 #[derive(Debug)]
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175 #[repr(C)]
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176 pub struct pam_repository {
136
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177 pub typ: *mut c_char,
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178 pub scope: *mut c_void,
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179 pub scope_len: usize,
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180 }
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181
127
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182 // These are the functions specified in X/SSO. Everybody exports them.
134
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183 #[link(name = "pam")]
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184 extern "C" {
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185 /// Account validation.
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186 pub fn pam_acct_mgmt(pamh: *mut pam_handle, flags: c_int) -> c_int;
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187
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188 /// Authenticate a user.
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189 pub fn pam_authenticate(pamh: *mut pam_handle, flags: c_int) -> c_int;
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190
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191 // Nobody implements pam_authenticate_secondary.
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192
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193 /// Manage authentication tokens.
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194 pub fn pam_chauthtok(pamh: *mut pam_handle, flags: c_int) -> c_int;
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195
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196 /// Close an opened user session.
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197 pub fn pam_close_session(pamh: *mut pam_handle, flags: c_int) -> c_int;
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198
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199 /// Ends the PAM transaction.
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200 pub fn pam_end(pamh: *mut pam_handle, flags: c_int) -> c_int;
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201
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202 /// Gets module-specific data. PAM still owns the data.
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203 pub fn pam_get_data(
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204 pamh: *mut pam_handle,
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205 module_data_name: *const c_char,
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206 data: *mut *const c_void,
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207 ) -> c_int;
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208
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209 /// Gets an environment variable. You own the return value.
130
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210 pub fn pam_getenv(pamh: *const pam_handle, name: *const c_char) -> *mut c_char;
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211
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212 /// Gets all the environment variables. You own everything it points to.
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213 pub fn pam_getenvlist(pamh: *const pam_handle) -> *mut *mut c_char;
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214
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215 /// Get information about the transaction.
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216 ///
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217 /// The item is owned by PAM.
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218 pub fn pam_get_item(
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219 pamh: *const pam_handle,
127
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220 item_type: c_int,
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221 item: *mut *const c_void,
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222 ) -> c_int;
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223
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224 // Nobody implements pam_get_mapped_authtok.
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225 // Nobody implements pam_get_mapped_username.
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226
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227 /// Get the username. PAM owns it.
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228 pub fn pam_get_user(
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229 pamh: *mut pam_handle,
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230 user: *mut *const c_char,
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231 prompt: *const c_char,
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232 ) -> c_int;
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233
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234 /// Opens a user session.
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235 pub fn pam_open_session(pamh: *mut pam_handle, flags: c_int) -> c_int;
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236
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237 /// Sets the value of an environment variable. `namevalue` is copied.
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238 pub fn pam_putenv(pamh: *mut pam_handle, namevalue: *const c_char) -> c_int;
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239
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240 /// Update or delete user credentials.
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241 pub fn pam_setcred(pamh: *mut pam_handle, flags: c_int) -> c_int;
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242
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243 /// Set module-specific data. PAM will call `cleanup` when completed.
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244 pub fn pam_set_data(
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245 pamh: *mut pam_handle,
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246 module_data_name: *const c_char,
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247 data: *mut c_void,
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248 cleanup: unsafe extern "C" fn(
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249 pamh: *mut pam_handle,
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250 data: *mut c_void,
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251 pam_end_status: c_int,
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252 ),
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253 ) -> c_int;
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254
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255 /// Set information about the transaction. The `item` is copied.
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256 pub fn pam_set_item(pamh: *mut pam_handle, item_type: c_int, item: *const c_void) -> c_int;
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257
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258 // Nobody implements pam_set_mapped_authtok.
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259 // Nobody implements pam_set_mapped_username.
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260
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261 // The pam_sm_whatever functions are prototypes for the functions that
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262 // a PAM module should implement, not symbols provided by PAM.
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263
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264 // Nobody implements pam_authenticate_secondary.
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265
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266 /// Starts a PAM transaction. The `conv` may or may not be copied.
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267 pub fn pam_start(
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268 service: *const c_char,
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269 user: *const c_char,
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270 pam_conv: *mut pam_conv,
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271 pamh: *mut *mut pam_handle,
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272 ) -> c_int;
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273
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274 /// Gets a statically-allocated error string.
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275 ///
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276 /// All implementations of PAM known to this library (Linux-PAM, OpenPAM,
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277 /// and Sun) ignore `pamh` and will accept a null pointer.
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278 pub fn pam_strerror(pamh: *const pam_handle, error_number: c_int) -> *mut c_char;
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279 }
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280
134
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281 #[cfg(any(pam_impl = "LinuxPam", pam_impl = "OpenPam"))]
127
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282 extern "C" {
131
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283 /// Gets `PAM_AUTHTOK`, or asks the user if that is unset.
130
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284 pub fn pam_get_authtok(
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285 pamh: *mut pam_handle,
131
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286 item: c_int,
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287 authtok: *mut *const c_char,
130
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288 prompt: *const c_char,
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289 ) -> c_int;
133
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290
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291 pub fn pam_prompt(
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292 pamh: *const pam_handle,
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293 style: c_int,
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294 response: *mut *mut c_char,
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295 fmt: *const c_char,
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296 ...
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297 ) -> c_int;
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298
127
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299 }
131
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300
134
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301 #[cfg(pam_impl = "LinuxPam")]
131
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302 extern "C" {
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303 pub fn pam_fail_delay(pamh: *mut pam_handle, musec_delay: c_uint) -> c_int;
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304
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305 /// Start a PAM transaction based on configuration in the given directory.
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306 pub fn pam_start_confdir(
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307 service_name: *const c_char,
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308 user: *const c_char,
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309 pam_conversation: *mut pam_conv,
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310 confdir: *const c_char,
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311 pamh: *mut *mut pam_handle,
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312 ) -> c_int;
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313
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314 // We don't export the v-variants of the formatting functions.
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315
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316 pub fn pam_syslog(pamh: *const pam_handle, priority: c_int, fmt: *const c_char, ...);
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317
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318 pub fn pam_get_authtok_noverify(
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319 pamh: *const pam_handle,
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320 authtok: *mut *const c_char,
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321 prompt: *const c_char,
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322 ) -> c_int;
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323
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324 pub fn pam_get_authtok_verify(
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325 pamh: *const pam_handle,
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326 authtok: *mut *const c_char,
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327 prompt: *const c_char,
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328 ) -> c_int;
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329
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330 // pam_modutil also lives in libpam for Linux.
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331
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332 pub fn pam_modutil_check_user_in_passwd(
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333 pamh: *mut pam_handle,
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334 user_name: *const c_char,
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335 file_name: *const c_char,
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336 ) -> c_int;
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337
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338 pub fn pam_modutil_getpwnam(pamh: *mut pam_handle, user: *const c_char) -> *mut libc::passwd;
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339
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340 pub fn pam_modutil_getpwuid(pamh: *mut pam_handle, uid: libc::uid_t) -> *mut libc::passwd;
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341
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342 pub fn pam_modutil_getgrnam(pamh: *mut pam_handle, group: *const c_char) -> *mut libc::group;
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343
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344 pub fn pam_modutil_getgrgid(pamh: *mut pam_handle, gid: libc::gid_t) -> *mut libc::group;
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345
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346 pub fn pam_modutil_getspnam(pamh: *mut pam_handle, user: *const c_char) -> *mut libc::spwd;
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347
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348 pub fn pam_modutil_user_in_group_nam_nam(
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349 pamh: *mut pam_handle,
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350 user: *const c_char,
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351 group: *const c_char,
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352 ) -> c_int;
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353 pub fn pam_modutil_user_in_group_nam_gid(
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354 pamh: *mut pam_handle,
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355 user: *const c_char,
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356 group: libc::gid_t,
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357 ) -> c_int;
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358
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359 pub fn pam_modutil_user_in_group_uid_nam(
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360 pamh: *mut pam_handle,
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361 user: libc::uid_t,
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362 group: *const c_char,
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363 ) -> c_int;
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364
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365 pub fn pam_modutil_user_in_group_uid_gid(
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366 pamh: *mut pam_handle,
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367 user: libc::uid_t,
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368 group: libc::gid_t,
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369 ) -> c_int;
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370
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371 pub fn pam_modutil_getlogin(pamh: *mut pam_handle) -> *const c_char;
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372
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373 pub fn pam_modutil_read(fd: c_int, buffer: *mut c_char, count: c_int) -> c_int;
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374
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375 pub fn pam_modutil_write(fd: c_int, buffer: *const c_char, count: c_int) -> c_int;
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376
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377 pub fn pam_modutil_audit_write(
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378 pamh: *mut pam_handle,
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379 typ: c_int,
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380 message: *const c_char,
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381 retval: c_int,
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382 ) -> c_int;
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383
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384 pub fn pam_modutil_drop_priv(
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385 pamh: *mut pam_handle,
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386 p: *mut pam_modutil_privs,
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387 pw: *const libc::passwd,
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388 ) -> c_int;
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389
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390 pub fn pam_modutil_regain_priv(pamh: *mut pam_handle, p: *mut pam_modutil_privs) -> c_int;
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391
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392 pub fn pam_modutil_sanitize_helper_fds(
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393 pamh: *mut pam_handle,
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394 redirect_stdin: pam_modutil_redirect_fd,
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395 redirect_stdout: pam_modutil_redirect_fd,
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396 redirect_stderr: pam_modutil_redirect_fd,
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397 ) -> c_int;
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398
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399 pub fn pam_modutil_search_key(
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400 pamh: *mut pam_handle,
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401 file_name: *const c_char,
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402 key: *const c_char,
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diff changeset
403 ) -> *mut c_char;
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404 }
133
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parents: 131
diff changeset
405
134
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406 #[cfg(pam_impl = "OpenPam")]
133
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diff changeset
407 extern "C" {
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408 pub fn openpam_borrow_cred(pamh: *mut pam_handle, passwd: *const libc::passwd) -> c_int;
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parents: 131
diff changeset
409
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410 pub fn openpam_subst(
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411 pamh: *const pam_handle,
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412 buf: *mut c_char,
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413 _bufsize: *mut usize,
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414 _template: *const c_char,
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415 ) -> c_int;
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416
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417 pub fn openpam_free_data(pamh: *mut pam_handle, data: *mut c_void, status: c_int);
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418
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419 pub fn openpam_free_envlist(_envlist: *mut *mut c_char);
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420
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421 pub fn openpam_get_option(_pamh: *mut pam_handle, _option: *const c_char) -> *const c_char;
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422
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423 pub fn openpam_restore_cred(pamh: *mut pam_handle) -> c_int;
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424
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425 pub fn openpam_set_option(
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426 _pamh: *mut pam_handle,
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427 _option: *const c_char,
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428 _value: *const c_char,
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429 ) -> c_int;
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430
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431 pub fn pam_error(pamh: *const pam_handle, _fmt: *const c_char, ...) -> c_int;
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432
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433 pub fn pam_info(_pamh: *const pam_handle, _fmt: *const c_char, ...) -> c_int;
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434
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435 pub fn openpam_readline(
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436 _f: *mut libc::FILE,
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437 _lineno: *mut c_int,
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438 _lenp: *mut usize,
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439 ) -> *mut c_char;
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440
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441 pub fn openpam_readlinev(
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442 _f: *mut libc::FILE,
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443 _lineno: *mut c_int,
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444 _lenp: *mut c_int,
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445 ) -> *mut *mut c_char;
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446
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447 pub fn openpam_readword(
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448 _f: *mut libc::FILE,
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449 _lineno: *mut c_int,
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450 _lenp: *mut usize,
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451 ) -> *mut c_char;
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452
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453 pub fn openpam_straddch(
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454 _str: *mut *mut c_char,
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455 _sizep: *mut usize,
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456 _lenp: *mut usize,
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457 ch: c_int,
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458 ) -> c_int;
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459
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460 pub fn openpam_set_feature(_feature: c_int, _onoff: c_int) -> c_int;
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461
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462 pub fn openpam_get_feature(_feature: c_int, _onoff: *mut c_int) -> c_int;
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463
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464 pub fn _openpam_log(_level: c_int, _func: *const c_char, _fmt: *const c_char, ...);
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465
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466 /// A premade conversation function that talks to the TTY.
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467 ///
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468 /// ```no_run
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469 /// # use std::ffi::CString;
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470 /// # use std::ptr;
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471 /// use libpam_sys::*;
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472 /// # let service = CString::new("whatever").unwrap();
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473 /// # let user = CString::new("whatever").unwrap();
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474 /// let mut handle: *mut pam_handle = ptr::null_mut();
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475 /// let mut conv = pam_conv{
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476 /// conv: openpam_ttyconv,
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477 /// appdata_ptr: ptr::null_mut(),
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478 /// };
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479 /// let result = unsafe { pam_start(
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480 /// service.as_ptr(), user.as_ptr(), &mut conv, &mut handle
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481 /// ) };
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482 /// ```
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483 pub fn openpam_ttyconv(
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484 n: c_int,
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485 _msg: *const *const pam_message,
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486 _resp: *mut *mut pam_response,
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487 _data: *mut AppData,
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488 ) -> c_int;
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489
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490 pub static mut openpam_ttyconv_timeout: c_int;
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491
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492 /// A null conversation function.
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493 ///
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494 /// ```no_run
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495 /// # use std::ffi::CString;
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496 /// # use std::ptr;
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497 /// use libpam_sys::*;
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498 /// # let service = CString::new("whatever").unwrap();
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499 /// # let user = CString::new("whatever").unwrap();
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500 /// let mut handle: *mut pam_handle = ptr::null_mut();
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501 /// let mut conv = pam_conv{
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502 /// conv: openpam_nullconv,
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503 /// appdata_ptr: ptr::null_mut(),
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504 /// };
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505 /// let result = unsafe { pam_start(
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506 /// service.as_ptr(), user.as_ptr(), &mut conv, &mut handle
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507 /// ) };
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508 /// ```
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509 pub fn openpam_nullconv(
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510 n: c_int,
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511 _msg: *const *const pam_message,
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512 _resp: *mut *mut pam_response,
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513 _data: *mut AppData,
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514 ) -> c_int;
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515 }