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#![allow(dead_code)]
use pam::{Pam, PamError, PamFlag};
use pam_types::{PamConv, PamHandle, PamItemType, PamMessage, PamMsgStyle, PamResponse};
use std::ffi::{CStr, CString, NulError};
use std::ops::Deref;
use std::option::Option;
use std::os::raw::{c_char, c_int, c_void};
use std::ptr;
pub type PamResult<T> = Result<T, PamError>;
pub type PamCleanupCb = fn(&Vec<u8>, Pam, i32, PamError);
#[derive(Clone)]
struct PamByteData {
cb: Option<PamCleanupCb>,
data: Vec<u8>,
}
pub trait PamData {
fn cleanup(&self, _pam: Pam, _flags: i32, _status: PamError) {}
}
impl PamData for PamByteData {
fn cleanup(&self, pam: Pam, flags: i32, status: PamError) {
if let Some(cb) = self.cb {
(cb)(&self.data, pam, flags, status);
}
}
}
impl<T: PamData, U> PamData for U
where
U: Deref<Target = T>,
{
fn cleanup(&self, pam: Pam, flags: i32, status: PamError) {
T::cleanup(&*self, pam, flags, status)
}
}
impl PamError {
fn to_result<T>(self, ok: T) -> PamResult<T> {
if self == PamError::SUCCESS {
Ok(ok)
} else {
Err(self)
}
}
}
mod private {
pub trait Sealed {}
impl Sealed for super::Pam {}
}
impl Pam {
fn get_cstr_item(&self, item_type: PamItemType) -> PamResult<Option<&CStr>> {
match item_type {
PamItemType::CONV | PamItemType::FAIL_DELAY | PamItemType::XAUTHDATA => {
panic!("Error, get_cstr_item can only be used with pam item returning c-strings")
}
_ => (),
}
let mut raw_item: *const c_void = ptr::null();
let r = unsafe { PamError::new(pam_get_item(self.0, item_type as c_int, &mut raw_item)) };
if raw_item.is_null() {
r.to_result(None)
} else {
r.to_result(Some(unsafe { CStr::from_ptr(raw_item as *const c_char) }))
}
}
}
pub trait PamLibExt: private::Sealed {
fn get_user(&self, prompt: Option<&str>) -> PamResult<Option<&CStr>>;
fn get_cached_user(&self) -> PamResult<Option<&CStr>>;
fn get_cached_authtok(&self) -> PamResult<Option<&CStr>>;
fn get_cached_oldauthtok(&self) -> PamResult<Option<&CStr>>;
fn get_authtok(&self, prompt: Option<&str>) -> PamResult<Option<&CStr>>;
fn set_authtok(&self, authtok: &CString) -> PamResult<()>;
fn get_rhost(&self) -> PamResult<Option<&CStr>>;
fn get_ruser(&self) -> PamResult<Option<&CStr>>;
fn conv(&self, prompt: Option<&str>, style: PamMsgStyle) -> PamResult<Option<&CStr>>;
fn getenv(&self, name: &str) -> PamResult<Option<&CStr>>;
fn putenv(&self, name_value: &str) -> PamResult<()>;
unsafe fn send_data<T: PamData + Clone + Send>(
&self,
module_name: &str,
data: T,
) -> PamResult<()>;
unsafe fn retrieve_data<T: PamData + Clone + Send>(&self, module_name: &str) -> PamResult<T>;
fn send_bytes(
&self,
module_name: &str,
data: Vec<u8>,
cb: Option<PamCleanupCb>,
) -> PamResult<()>;
fn retrieve_bytes(&self, module_name: &str) -> PamResult<Vec<u8>>;
}
impl From<NulError> for PamError {
fn from(_: NulError) -> PamError {
PamError::SERVICE_ERR
}
}
impl PamLibExt for Pam {
fn get_user(&self, prompt: Option<&str>) -> PamResult<Option<&CStr>> {
let cprompt = match prompt {
None => None,
Some(p) => Some(CString::new(p)?),
};
let mut raw_user: *const c_char = ptr::null();
let r = unsafe {
PamError::new(pam_get_user(
self.0,
&mut raw_user,
cprompt.as_ref().map_or(ptr::null(), |p| p.as_ptr()),
))
};
if raw_user.is_null() {
r.to_result(None)
} else {
r.to_result(Some(unsafe { CStr::from_ptr(raw_user) }))
}
}
fn get_cached_user(&self) -> PamResult<Option<&CStr>> {
self.get_cstr_item(PamItemType::USER)
}
fn get_cached_authtok(&self) -> PamResult<Option<&CStr>> {
self.get_cstr_item(PamItemType::AUTHTOK)
}
fn get_cached_oldauthtok(&self) -> PamResult<Option<&CStr>> {
self.get_cstr_item(PamItemType::OLDAUTHTOK)
}
fn get_authtok(&self, prompt: Option<&str>) -> PamResult<Option<&CStr>> {
let cprompt = match prompt {
None => None,
Some(p) => Some(CString::new(p)?),
};
let mut raw_at: *const c_char = ptr::null();
let r = unsafe {
PamError::new(pam_get_authtok(
self.0,
PamItemType::AUTHTOK as i32,
&mut raw_at,
cprompt.as_ref().map_or(ptr::null(), |p| p.as_ptr()),
))
};
if raw_at.is_null() {
r.to_result(None)
} else {
r.to_result(unsafe { Some(CStr::from_ptr(raw_at)) })
}
}
fn set_authtok(&self, authtok: &CString) -> PamResult<()> {
unsafe {
set_item(
self.0,
PamItemType::AUTHTOK,
authtok.as_ptr() as *const c_void,
)
}
}
fn get_rhost(&self) -> PamResult<Option<&CStr>> {
self.get_cstr_item(PamItemType::RHOST)
}
fn get_ruser(&self) -> PamResult<Option<&CStr>> {
self.get_cstr_item(PamItemType::RUSER)
}
fn conv(&self, prompt: Option<&str>, style: PamMsgStyle) -> PamResult<Option<&CStr>> {
let mut conv_pointer: *const c_void = ptr::null();
let r = unsafe {
PamError::new(pam_get_item(
self.0,
PamItemType::CONV as c_int,
&mut conv_pointer,
))
};
if r != PamError::SUCCESS {
return Err(r);
}
if conv_pointer.is_null() {
return Ok(None);
}
let conv = unsafe { &*(conv_pointer as *const PamConv) };
let mut resp_ptr: *mut PamResponse = ptr::null_mut();
let msg_cstr = CString::new(prompt.unwrap_or(""))?;
let msg = PamMessage {
msg_style: style,
msg: msg_cstr.as_ptr(),
};
match conv.cb.map(|cb| {
PamError::new(cb(
1,
&mut (&msg as *const PamMessage),
&mut resp_ptr,
conv.appdata_ptr,
))
}) {
Some(PamError::SUCCESS) => {
Ok(unsafe { (*resp_ptr).resp }.map(|r| unsafe { CStr::from_ptr(r.as_ptr()) }))
}
Some(ret) => Err(ret),
None => Ok(None),
}
}
fn getenv(&self, name: &str) -> PamResult<Option<&CStr>> {
let cname = CString::new(name)?;
let cenv = unsafe { pam_getenv(self.0, cname.as_ptr()) };
if cenv.is_null() {
Ok(None)
} else {
unsafe { Ok(Some(CStr::from_ptr(cenv))) }
}
}
fn putenv(&self, name_value: &str) -> PamResult<()> {
let cenv = CString::new(name_value)?;
unsafe { PamError::new(pam_putenv(self.0, cenv.as_ptr())).to_result(()) }
}
unsafe fn send_data<T: PamData + Clone + Send>(
&self,
module_name: &str,
data: T,
) -> PamResult<()> {
let data_copy = Box::new(data);
PamError::new(pam_set_data(
self.0,
CString::new(module_name)?.as_ptr(),
Box::into_raw(data_copy) as *mut c_void,
Some(pam_data_cleanup::<T>),
))
.to_result(())
}
unsafe fn retrieve_data<T: PamData + Clone + Send>(&self, module_name: &str) -> PamResult<T> {
let mut data_ptr: *const c_void = ptr::null();
PamError::new(pam_get_data(
self.0,
CString::new(module_name)?.as_ptr(),
&mut data_ptr,
))
.to_result(data_ptr as *const T)
.map(|ptr| (*ptr).clone())
}
fn send_bytes(
&self,
module_name: &str,
data: Vec<u8>,
cb: Option<PamCleanupCb>,
) -> PamResult<()> {
let data_cb = PamByteData { data, cb };
unsafe { self.send_data(module_name, data_cb) }
}
fn retrieve_bytes(&self, module_name: &str) -> PamResult<Vec<u8>> {
unsafe { self.retrieve_data::<PamByteData>(module_name) }.map(|data_cb| data_cb.data)
}
}
unsafe extern "C" fn pam_data_cleanup<T: PamData + Clone + Send>(
handle: PamHandle,
data: *mut c_void,
error_status: c_int,
) {
let mut flags = 0i32;
flags |= error_status & PamFlag::DATA_REPLACE as i32;
flags |= error_status & PamFlag::SILENT as i32;
Box::from_raw(data as *mut T).cleanup(Pam(handle), flags, PamError::new(error_status & 0xff));
}
unsafe fn set_item(pamh: PamHandle, item_type: PamItemType, item: *const c_void) -> PamResult<()> {
PamError::new(pam_set_item(pamh, item_type as c_int, item)).to_result(())
}
#[link(name = "pam")]
extern "C" {
pub fn pam_set_item(pamh: PamHandle, item_type: c_int, item: *const c_void) -> c_int;
pub fn pam_get_item(pamh: PamHandle, item_type: c_int, item: *mut *const c_void) -> c_int;
pub fn pam_strerror(pamh: PamHandle, errnum: c_int) -> *const c_char;
pub fn pam_putenv(pamh: PamHandle, name_value: *const c_char) -> c_int;
pub fn pam_getenv(pamh: PamHandle, name: *const c_char) -> *const c_char;
pub fn pam_getenvlist(pamh: PamHandle) -> *mut *mut c_char;
pub fn pam_set_data(
pamh: PamHandle,
module_data_name: *const c_char,
data: *mut c_void,
cleanup: Option<unsafe extern "C" fn(_: PamHandle, _: *mut c_void, _: c_int)>,
) -> c_int;
pub fn pam_get_data(
pamh: PamHandle,
module_data_name: *const c_char,
data: *mut *const c_void,
) -> c_int;
pub fn pam_get_user(pamh: PamHandle, user: *mut *const c_char, prompt: *const c_char) -> c_int;
pub fn pam_get_authtok(
pamh: PamHandle,
item: c_int,
authok_ptr: *mut *const c_char,
prompt: *const c_char,
) -> c_int;
}