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annotate libpam-sys/src/ffi.rs @ 133:32b2a545ca3e

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Add functions and constants from openpam.h.
author Paul Fisher <paul@pfish.zone>
date Wed, 02 Jul 2025 03:33:09 -0400
parents a632a8874131
children 6c1e1bdb4164
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1 //! The actual PAM FFI bindings.
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2 //!
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3 //! They live in this specific file rather than lib.rs because otherwise
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4 //! ctest gets very upset about some of the macros we use.
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5 #![allow(non_camel_case_types)]
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6 #![allow(unused_imports)]
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7
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8 use num_enum::{IntoPrimitive, TryFromPrimitive};
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9 use std::ffi::{c_char, c_int, c_uint, c_void};
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10 use std::fmt;
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11 use std::marker::{PhantomData, PhantomPinned};
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12
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13 /// A marker struct to make whatever it's in `!Sync`, `!Send`, and `!Unpin`.
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14 #[derive(Default, PartialOrd, PartialEq, Ord, Eq)]
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15 #[repr(C)]
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16 struct ExtremelyUnsafe {
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17 _value: (),
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18 _marker: PhantomData<(PhantomPinned, *mut c_void)>,
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19 }
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20
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21 impl fmt::Debug for ExtremelyUnsafe {
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22 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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23 write!(f, "ExtremelyUnsafe({self:p})")
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24 }
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25 }
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27 /// An opaque structure that PAM uses to communicate.
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28 ///
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29 /// This is only ever returned in pointer form and cannot be constructed.
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30 #[repr(C)]
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31 pub struct pam_handle(ExtremelyUnsafe);
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32
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33 impl fmt::Debug for pam_handle {
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34 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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35 write!(f, "pam_handle({self:p}")
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36 }
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37 }
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38
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39 /// An opaque structure that is passed through PAM in a conversation.
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40 #[repr(C)]
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41 pub struct AppData(ExtremelyUnsafe);
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43 impl fmt::Debug for AppData {
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44 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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45 write!(f, "AppData({self:p}")
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46 }
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47 }
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49 /// Just an alias for the type of [`pam_conv::conv`].
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50 ///
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51 /// For important details about the format of `messages`,
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52 /// see the [`helpers`](crate::helpers) module.
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53 ///
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54 /// ```no_run
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55 /// # use libpam_sys::{ConversationCallback, pam_conv};
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56 /// fn convo() -> ConversationCallback {
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57 /// // ...
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58 /// # unimplemented!()
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59 /// }
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60 /// let conv = pam_conv{conv: convo(), appdata_ptr: std::ptr::null_mut()};
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61 /// ```
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62 pub type ConversationCallback = unsafe extern "C" fn(
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63 num_msg: c_int,
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64 msg: *const *const pam_message,
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65 resp: *mut *mut pam_response,
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66 appdata: *mut AppData,
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67 ) -> c_int;
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68
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69 /// Alias for the callback to [`pam_set_data`](pam_set_data).
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70 ///
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71 /// ```no_run
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72 /// # use std::ffi::CString;
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73 /// use libpam_sys::{CleanupCallback, pam_set_data};
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74 /// # use libpam_sys::pam_handle;
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75 /// # let handle: *mut pam_handle = std::ptr::null_mut();
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76 /// # let mut my_data = 100;
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77 /// # let data_ptr = &mut my_data as *mut i32;
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78 /// fn cleanup() -> CleanupCallback {
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79 /// // ...
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80 /// # unimplemented!()
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81 /// }
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82 /// let name = CString::new("name").unwrap();
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83 /// unsafe {
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84 /// pam_set_data(handle, name.as_ptr().cast_mut(), data_ptr.cast(), cleanup());
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85 /// }
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86 /// ```
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87 pub type CleanupCallback =
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88 unsafe extern "C" fn(pamh: *mut pam_handle, data: *mut c_void, pam_end_status: c_int);
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89
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90 /// Used by PAM to communicate between the module and the application.
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91 #[repr(C)]
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92 pub struct pam_conv {
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93 pub conv: unsafe extern "C" fn(
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94 num_msg: c_int,
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95 msg: *const *const pam_message,
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96 resp: *mut *mut pam_response,
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97 appdata: *mut AppData,
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98 ) -> c_int,
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99 pub appdata_ptr: *mut AppData,
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100 }
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101
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102 /// A message sent into a PAM conversation.
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103 #[repr(C)]
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104 pub struct pam_message {
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105 pub msg_style: c_int,
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106 pub msg: *const c_char,
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107 }
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108
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109 /// A response returned from a PAM conversation.
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110 #[repr(C)]
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111 pub struct pam_response {
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112 pub resp: *mut c_char,
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113 /// Completely unused.
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114 pub resp_retcode: c_int,
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115 }
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116
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117 /// Definition of the PAM_XAUTHDATA item. Compatible with `xcb_auth_info_t`.
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118 #[cfg(_hack_impl = "LinuxPam")]
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119 #[repr(C)]
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120 pub struct pam_xauth_data {
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121 namelen: c_int,
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122 name: *mut c_char,
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123 datalen: c_int,
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124 data: *mut c_char,
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125 }
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126
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127 #[cfg(_hack_impl = "LinuxPam")]
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128 #[derive(Copy, Clone, Debug, PartialEq, Eq, TryFromPrimitive, IntoPrimitive)]
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129 #[repr(i32)]
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130 pub enum pam_modutil_redirect_fd {
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131 PAM_MODUTIL_IGNORE_FD,
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132 PAM_MODUTIL_PIPE_FD,
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133 PAM_MODUTIL_NULL_FD,
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134 }
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135
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136 #[cfg(_hack_impl = "LinuxPam")]
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137 pub use pam_modutil_redirect_fd::*;
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138
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139 #[cfg(_hack_impl = "LinuxPam")]
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140 #[derive(Debug)]
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141 #[repr(C)]
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142 pub struct pam_modutil_privs {
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143 grplist: *mut libc::gid_t,
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144 number_of_groups: c_int,
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145 allocated: c_int,
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146 old_gid: libc::gid_t,
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147 old_uid: libc::uid_t,
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148 is_dropped: c_int,
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149 }
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150
133
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151 #[cfg(_hack_impl = "OpenPam")]
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152 pub type pam_func_t = unsafe extern "C" fn(
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153 handle: *mut pam_handle,
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154 flags: c_int,
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155 argc: c_int,
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156 argv: *const *const c_char,
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157 ) -> c_int;
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158
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159 #[cfg(_hack_impl = "OpenPam")]
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160 #[derive(Debug)]
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161 #[repr(C)]
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162 pub struct pam_module {
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163 path: *mut c_char,
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164 func: [pam_func_t; 6],
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165 dlh: *mut c_void,
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166 }
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167
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168 #[cfg(_hack_impl = "OpenPam")]
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169 #[derive(Debug)]
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170 #[repr(C)]
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171 pub struct pam_repository {
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172 typ: *mut c_char,
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173 scope: *mut c_void,
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174 scope_len: usize,
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175 }
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176
127
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177 // These are the functions specified in X/SSO. Everybody exports them.
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178 extern "C" {
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179 /// Account validation.
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180 pub fn pam_acct_mgmt(pamh: *mut pam_handle, flags: c_int) -> c_int;
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181
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182 /// Authenticate a user.
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183 pub fn pam_authenticate(pamh: *mut pam_handle, flags: c_int) -> c_int;
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184
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185 // Nobody implements pam_authenticate_secondary.
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186
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187 /// Manage authentication tokens.
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188 pub fn pam_chauthtok(pamh: *mut pam_handle, flags: c_int) -> c_int;
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189
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190 /// Close an opened user session.
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191 pub fn pam_close_session(pamh: *mut pam_handle, flags: c_int) -> c_int;
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192
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193 /// Ends the PAM transaction.
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194 pub fn pam_end(pamh: *mut pam_handle, flags: c_int) -> c_int;
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195
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196 /// Gets module-specific data. PAM still owns the data.
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197 pub fn pam_get_data(
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198 pamh: *mut pam_handle,
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199 module_data_name: *const c_char,
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200 data: *mut *const c_void,
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201 ) -> c_int;
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202
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203 /// Gets an environment variable. You own the return value.
130
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204 pub fn pam_getenv(pamh: *const pam_handle, name: *const c_char) -> *mut c_char;
127
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205
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206 /// Gets all the environment variables. You own everything it points to.
130
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207 pub fn pam_getenvlist(pamh: *const pam_handle) -> *mut *mut c_char;
127
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208
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209 /// Get information about the transaction.
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210 ///
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211 /// The item is owned by PAM.
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212 pub fn pam_get_item(
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213 pamh: *const pam_handle,
127
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214 item_type: c_int,
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215 item: *mut *const c_void,
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216 ) -> c_int;
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217
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218 // Nobody implements pam_get_mapped_authtok.
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219 // Nobody implements pam_get_mapped_username.
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220
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221 /// Get the username. PAM owns it.
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222 pub fn pam_get_user(
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223 pamh: *mut pam_handle,
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224 user: *mut *const c_char,
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225 prompt: *const c_char,
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226 ) -> c_int;
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227
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228 /// Opens a user session.
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229 pub fn pam_open_session(pamh: *mut pam_handle, flags: c_int) -> c_int;
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230
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231 /// Sets the value of an environment variable. `namevalue` is copied.
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232 pub fn pam_putenv(pamh: *mut pam_handle, namevalue: *const c_char) -> c_int;
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233
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234 /// Update or delete user credentials.
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235 pub fn pam_setcred(pamh: *mut pam_handle, flags: c_int) -> c_int;
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236
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237 /// Set module-specific data. PAM will call `cleanup` when completed.
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238 pub fn pam_set_data(
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239 pamh: *mut pam_handle,
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240 module_data_name: *const c_char,
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241 data: *mut c_void,
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242 cleanup: unsafe extern "C" fn(
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243 pamh: *mut pam_handle,
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244 data: *mut c_void,
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245 pam_end_status: c_int,
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246 ),
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247 ) -> c_int;
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248
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249 /// Set information about the transaction. The `item` is copied.
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250 pub fn pam_set_item(pamh: *mut pam_handle, item_type: c_int, item: *const c_void) -> c_int;
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251
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252 // Nobody implements pam_set_mapped_authtok.
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253 // Nobody implements pam_set_mapped_username.
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254
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255 // The pam_sm_whatever functions are prototypes for the functions that
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256 // a PAM module should implement, not symbols provided by PAM.
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257
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258 // Nobody implements pam_authenticate_secondary.
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259
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260 /// Starts a PAM transaction. The `conv` may or may not be copied.
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261 pub fn pam_start(
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262 service: *const c_char,
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263 user: *const c_char,
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264 pam_conv: *mut pam_conv,
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265 pamh: *mut *mut pam_handle,
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266 ) -> c_int;
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267
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268 /// Gets a statically-allocated error string.
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269 ///
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270 /// All implementations of PAM known to this library (Linux-PAM, OpenPAM,
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271 /// and Sun) ignore `pamh` and will accept a null pointer.
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272 pub fn pam_strerror(pamh: *const pam_handle, error_number: c_int) -> *mut c_char;
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273 }
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274
131
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275 // We use `_hack_impl` because ctest loses its mind
127
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276 // when it comes across the `cfg_pam_impl` macro.
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277 // This is a custom cfg variable set in our build.rs. Don't do this; just use
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278 // cfg_pam_impl.
131
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279 #[cfg(any(_hack_impl = "LinuxPam", _hack_impl = "OpenPam"))]
127
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280 extern "C" {
131
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281 /// Gets `PAM_AUTHTOK`, or asks the user if that is unset.
130
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282 pub fn pam_get_authtok(
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283 pamh: *mut pam_handle,
131
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284 item: c_int,
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285 authtok: *mut *const c_char,
130
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286 prompt: *const c_char,
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287 ) -> c_int;
133
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288
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289 pub fn pam_prompt(
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290 pamh: *const pam_handle,
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291 style: c_int,
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292 response: *mut *mut c_char,
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293 fmt: *const c_char,
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294 ...
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295 ) -> c_int;
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296
127
c77846f3a979 GET CTEST WORKING.
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297 }
131
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298
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299 #[cfg(_hack_impl = "LinuxPam")]
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300 extern "C" {
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301 pub fn pam_fail_delay(pamh: *mut pam_handle, musec_delay: c_uint) -> c_int;
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302
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303 /// Start a PAM transaction based on configuration in the given directory.
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304 pub fn pam_start_confdir(
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305 service_name: *const c_char,
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306 user: *const c_char,
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307 pam_conversation: *mut pam_conv,
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308 confdir: *const c_char,
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309 pamh: *mut *mut pam_handle,
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310 ) -> c_int;
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311
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312 // We don't export the v-variants of the formatting functions.
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313
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314 pub fn pam_syslog(pamh: *const pam_handle, priority: c_int, fmt: *const c_char, ...);
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315
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316 pub fn pam_get_authtok_noverify(
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317 pamh: *const pam_handle,
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318 authtok: *mut *const c_char,
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319 prompt: *const c_char,
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320 ) -> c_int;
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321
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322 pub fn pam_get_authtok_verify(
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323 pamh: *const pam_handle,
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324 authtok: *mut *const c_char,
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325 prompt: *const c_char,
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326 ) -> c_int;
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327
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328 // pam_modutil also lives in libpam for Linux.
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329
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330 pub fn pam_modutil_check_user_in_passwd(
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331 pamh: *mut pam_handle,
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332 user_name: *const c_char,
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333 file_name: *const c_char,
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334 ) -> c_int;
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335
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336 pub fn pam_modutil_getpwnam(pamh: *mut pam_handle, user: *const c_char) -> *mut libc::passwd;
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337
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338 pub fn pam_modutil_getpwuid(pamh: *mut pam_handle, uid: libc::uid_t) -> *mut libc::passwd;
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339
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340 pub fn pam_modutil_getgrnam(pamh: *mut pam_handle, group: *const c_char) -> *mut libc::group;
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341
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342 pub fn pam_modutil_getgrgid(pamh: *mut pam_handle, gid: libc::gid_t) -> *mut libc::group;
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343
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344 pub fn pam_modutil_getspnam(pamh: *mut pam_handle, user: *const c_char) -> *mut libc::spwd;
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345
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346 pub fn pam_modutil_user_in_group_nam_nam(
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347 pamh: *mut pam_handle,
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348 user: *const c_char,
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349 group: *const c_char,
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350 ) -> c_int;
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351 pub fn pam_modutil_user_in_group_nam_gid(
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352 pamh: *mut pam_handle,
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353 user: *const c_char,
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354 group: libc::gid_t,
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355 ) -> c_int;
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356
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357 pub fn pam_modutil_user_in_group_uid_nam(
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358 pamh: *mut pam_handle,
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359 user: libc::uid_t,
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360 group: *const c_char,
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diff changeset
361 ) -> c_int;
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362
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363 pub fn pam_modutil_user_in_group_uid_gid(
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364 pamh: *mut pam_handle,
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365 user: libc::uid_t,
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366 group: libc::gid_t,
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diff changeset
367 ) -> c_int;
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368
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369 pub fn pam_modutil_getlogin(pamh: *mut pam_handle) -> *const c_char;
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370
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371 pub fn pam_modutil_read(fd: c_int, buffer: *mut c_char, count: c_int) -> c_int;
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parents: 130
diff changeset
372
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373 pub fn pam_modutil_write(fd: c_int, buffer: *const c_char, count: c_int) -> c_int;
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374
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375 pub fn pam_modutil_audit_write(
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parents: 130
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376 pamh: *mut pam_handle,
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parents: 130
diff changeset
377 typ: c_int,
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parents: 130
diff changeset
378 message: *const c_char,
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parents: 130
diff changeset
379 retval: c_int,
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parents: 130
diff changeset
380 ) -> c_int;
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parents: 130
diff changeset
381
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parents: 130
diff changeset
382 pub fn pam_modutil_drop_priv(
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parents: 130
diff changeset
383 pamh: *mut pam_handle,
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parents: 130
diff changeset
384 p: *mut pam_modutil_privs,
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parents: 130
diff changeset
385 pw: *const libc::passwd,
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parents: 130
diff changeset
386 ) -> c_int;
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parents: 130
diff changeset
387
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parents: 130
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388 pub fn pam_modutil_regain_priv(pamh: *mut pam_handle, p: *mut pam_modutil_privs) -> c_int;
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parents: 130
diff changeset
389
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parents: 130
diff changeset
390 pub fn pam_modutil_sanitize_helper_fds(
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parents: 130
diff changeset
391 pamh: *mut pam_handle,
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parents: 130
diff changeset
392 redirect_stdin: pam_modutil_redirect_fd,
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parents: 130
diff changeset
393 redirect_stdout: pam_modutil_redirect_fd,
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parents: 130
diff changeset
394 redirect_stderr: pam_modutil_redirect_fd,
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parents: 130
diff changeset
395 ) -> c_int;
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parents: 130
diff changeset
396
a632a8874131 Get all the Linux-PAM functions into libpam-sys, and get tests right.
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parents: 130
diff changeset
397 pub fn pam_modutil_search_key(
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parents: 130
diff changeset
398 pamh: *mut pam_handle,
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parents: 130
diff changeset
399 file_name: *const c_char,
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parents: 130
diff changeset
400 key: *const c_char,
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parents: 130
diff changeset
401 ) -> *mut c_char;
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parents: 130
diff changeset
402 }
133
32b2a545ca3e Add functions and constants from openpam.h.
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parents: 131
diff changeset
403
32b2a545ca3e Add functions and constants from openpam.h.
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parents: 131
diff changeset
404 #[cfg(_hack_impl = "OpenPam")]
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parents: 131
diff changeset
405 extern "C" {
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parents: 131
diff changeset
406 pub fn openpam_borrow_cred(pamh: *mut pam_handle, passwd: *const libc::passwd) -> c_int;
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parents: 131
diff changeset
407
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parents: 131
diff changeset
408 pub fn openpam_subst(
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parents: 131
diff changeset
409 pamh: *const pam_handle,
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parents: 131
diff changeset
410 buf: *mut c_char,
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parents: 131
diff changeset
411 _bufsize: *mut usize,
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parents: 131
diff changeset
412 _template: *const c_char,
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parents: 131
diff changeset
413 ) -> c_int;
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parents: 131
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414
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415 pub fn openpam_free_data(pamh: *mut pam_handle, data: *mut c_void, status: c_int);
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416
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417 pub fn openpam_free_envlist(_envlist: *mut *mut c_char);
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418
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419 pub fn openpam_get_option(_pamh: *mut pam_handle, _option: *const c_char) -> *const c_char;
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420
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421 pub fn openpam_restore_cred(pamh: *mut pam_handle) -> c_int;
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422
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423 pub fn openpam_set_option(
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424 _pamh: *mut pam_handle,
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425 _option: *const c_char,
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426 _value: *const c_char,
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427 ) -> c_int;
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428
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429 pub fn pam_error(pamh: *const pam_handle, _fmt: *const c_char, ...) -> c_int;
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430
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431 pub fn pam_info(_pamh: *const pam_handle, _fmt: *const c_char, ...) -> c_int;
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432
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433 pub fn openpam_readline(
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434 _f: *mut libc::FILE,
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435 _lineno: *mut c_int,
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436 _lenp: *mut usize,
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437 ) -> *mut c_char;
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438
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439 pub fn openpam_readlinev(
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440 _f: *mut libc::FILE,
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441 _lineno: *mut c_int,
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442 _lenp: *mut c_int,
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443 ) -> *mut *mut c_char;
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444
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445 pub fn openpam_readword(
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446 _f: *mut libc::FILE,
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447 _lineno: *mut c_int,
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448 _lenp: *mut usize,
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449 ) -> *mut c_char;
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450
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451 pub fn openpam_straddch(
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452 _str: *mut *mut c_char,
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453 _sizep: *mut usize,
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454 _lenp: *mut usize,
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455 ch: c_int,
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456 ) -> c_int;
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457
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458 pub fn openpam_set_feature(_feature: c_int, _onoff: c_int) -> c_int;
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459
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460 pub fn openpam_get_feature(_feature: c_int, _onoff: *mut c_int) -> c_int;
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461
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462 pub fn _openpam_log(_level: c_int, _func: *const c_char, _fmt: *const c_char, ...);
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463
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464 /// A premade conversation function that talks to the TTY.
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465 ///
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466 /// ```no_run
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467 /// # use std::ffi::CString;
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468 /// # use std::ptr;
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469 /// use libpam_sys::*;
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470 /// # let service = CString::new("whatever").unwrap();
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471 /// # let user = CString::new("whatever").unwrap();
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472 /// let mut handle: *mut pam_handle = ptr::null_mut();
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473 /// let mut conv = pam_conv{
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474 /// conv: openpam_ttyconv,
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475 /// appdata_ptr: ptr::null_mut(),
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476 /// };
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477 /// let result = unsafe { pam_start(
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478 /// service.as_ptr(), user.as_ptr(), &mut conv, &mut handle
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479 /// ) };
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480 /// ```
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481 pub fn openpam_ttyconv(
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482 n: c_int,
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483 _msg: *const *const pam_message,
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484 _resp: *mut *mut pam_response,
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485 _data: *mut AppData,
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486 ) -> c_int;
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487
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488 pub static mut openpam_ttyconv_timeout: c_int;
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489
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490 /// A null conversation function.
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491 ///
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492 /// ```no_run
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493 /// # use std::ffi::CString;
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494 /// # use std::ptr;
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495 /// use libpam_sys::*;
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496 /// # let service = CString::new("whatever").unwrap();
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497 /// # let user = CString::new("whatever").unwrap();
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498 /// let mut handle: *mut pam_handle = ptr::null_mut();
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499 /// let mut conv = pam_conv{
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500 /// conv: openpam_nullconv,
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501 /// appdata_ptr: ptr::null_mut(),
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502 /// };
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503 /// let result = unsafe { pam_start(
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504 /// service.as_ptr(), user.as_ptr(), &mut conv, &mut handle
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505 /// ) };
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506 /// ```
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507 pub fn openpam_nullconv(
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508 n: c_int,
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509 _msg: *const *const pam_message,
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510 _resp: *mut *mut pam_response,
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511 _data: *mut AppData,
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512 ) -> c_int;
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513 }