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#![deny(warnings)]
#![deny(missing_docs)]
use std::ffi::CStr;
use std::io;
use std::os::raw::c_char;
mod ffi;
mod privileges;
pub use crate::privileges::Privilege;
pub enum PrivPtype {
Effective,
Inheritable,
Permitted,
Limit,
}
impl PrivPtype {
fn as_str(&self) -> &str {
match self {
PrivPtype::Effective => "Effective\0",
PrivPtype::Inheritable => "Inheritable\0",
PrivPtype::Permitted => "Permitted\0",
PrivPtype::Limit => "Limit\0",
}
}
fn as_ptr(&self) -> *const c_char {
CStr::from_bytes_with_nul(self.as_str().as_bytes())
.expect("all variants should be nul terminated")
.as_ptr()
}
}
#[repr(C)]
pub enum PrivOp {
On = 0,
Off,
Set,
}
pub struct PrivSet {
inner: *mut ffi::OpaquePrivSet,
}
impl PrivSet {
pub fn new_empty() -> io::Result<Self> {
unsafe {
let inner = ptr_or_err(ffi::priv_allocset())?;
ffi::priv_emptyset(inner);
Ok(PrivSet { inner })
}
}
pub fn new_basic() -> io::Result<Self> {
unsafe {
let inner = ptr_or_err(ffi::priv_allocset())?;
ffi::priv_basicset(inner);
Ok(PrivSet { inner })
}
}
pub fn basic(&self) {
unsafe {
ffi::priv_basicset(self.inner);
}
}
pub fn empty(&self) {
unsafe {
ffi::priv_emptyset(self.inner);
}
}
pub fn addset(&self, p: Privilege) -> io::Result<()> {
unsafe { ret_or_err(ffi::priv_addset(self.inner, p.as_ptr())) }
}
pub fn delset(&self, p: Privilege) -> io::Result<()> {
unsafe { ret_or_err(ffi::priv_delset(self.inner, p.as_ptr())) }
}
pub fn is_empty(&self) -> bool {
unsafe { true_or_false(ffi::priv_isemptyset(self.inner)) }
}
pub fn is_member(&self, p: Privilege) -> bool {
unsafe { true_or_false(ffi::priv_ismember(self.inner, p.as_ptr())) }
}
pub fn is_equal(&self, dst: &PrivSet) -> bool {
unsafe { true_or_false(ffi::priv_isequalset(self.inner, dst.inner)) }
}
}
impl PartialEq for PrivSet {
fn eq(&self, other: &Self) -> bool {
self.is_equal(other)
}
}
pub fn setppriv(op: PrivOp, ptype: PrivPtype, sp: &PrivSet) -> io::Result<()> {
unsafe { ret_or_err(ffi::setppriv(op as i32, ptype.as_ptr(), sp.inner)) }
}
pub fn getppriv(ptype: PrivPtype) -> io::Result<PrivSet> {
unsafe {
let inner = ptr_or_err(ffi::priv_allocset())?;
let sp = PrivSet { inner };
ret_or_err(ffi::getppriv(ptype.as_ptr(), sp.inner))?;
Ok(sp)
}
}
impl Drop for PrivSet {
fn drop(&mut self) {
if !self.inner.is_null() {
unsafe {
ffi::priv_freeset(self.inner);
}
}
}
}
fn ptr_or_err<T>(ptr: *mut T) -> io::Result<*mut T> {
if ptr.is_null() {
Err(io::Error::last_os_error())
} else {
Ok(ptr)
}
}
fn ret_or_err(ret: i32) -> io::Result<()> {
match ret {
-1 => Err(io::Error::last_os_error()),
_ => Ok(()),
}
}
fn true_or_false(ret: i32) -> bool {
match ret {
1 => true,
_ => false,
}
}
#[cfg(test)]
mod tests {
use super::*;
use std::process::Command;
#[test]
fn empty_set_test() {
let set = PrivSet::new_empty().unwrap();
assert_eq!(true, set.is_empty(), "set is empty");
}
#[test]
fn empty_test() {
let set = PrivSet::new_basic().unwrap();
assert_eq!(false, set.is_empty(), "set is not empty");
set.empty();
assert_eq!(true, set.is_empty(), "set is empty");
}
#[test]
fn is_equal_test() {
let src = PrivSet::new_basic().unwrap();
let dst = PrivSet::new_empty().unwrap();
assert_eq!(false, src.is_equal(&dst), "PrivSets are not equal");
dst.basic();
assert_eq!(true, src.is_equal(&dst), "PrivSets are equal");
assert!(src == dst, "PrivSets are equal");
}
#[test]
fn is_member_test() {
let set = PrivSet::new_basic().unwrap();
assert_eq!(
true,
set.is_member(Privilege::ProcFork),
"PRIV_PROC_FORK is in the set"
);
}
#[test]
fn add_priv_test() {
let set = PrivSet::new_empty().unwrap();
assert_eq!(
false,
set.is_member(Privilege::ProcFork),
"PRIV_PROC_FORK is not in the set"
);
let _ = set
.addset(Privilege::ProcFork)
.expect("failed to add to the set");
assert_eq!(
true,
set.is_member(Privilege::ProcFork),
"PRIV_PROC_FORK is in the set"
);
}
#[test]
fn del_priv_test() {
let set = PrivSet::new_basic().unwrap();
assert_eq!(
true,
set.is_member(Privilege::ProcFork),
"PRIV_PROC_FORK is in the set"
);
let _ = set
.delset(Privilege::ProcFork)
.expect("failed to delete from set");
assert_eq!(
false,
set.is_member(Privilege::ProcFork),
"PRIV_PROC_FORK is not in the set"
);
}
#[test]
fn getppriv_test() {
let orig = getppriv(PrivPtype::Effective).unwrap();
let src = PrivSet::new_basic().unwrap();
let _ = src
.delset(Privilege::ProcFork)
.expect("failed to delete from set");
setppriv(PrivOp::Set, PrivPtype::Effective, &src).unwrap();
let dst = getppriv(PrivPtype::Effective).unwrap();
assert!(src == dst, "getpprive PrivSet matches the one we just set");
setppriv(PrivOp::Set, PrivPtype::Effective, &orig).unwrap();
}
#[test]
fn drop_fork_test() {
let orig = getppriv(PrivPtype::Effective).unwrap();
let set = PrivSet::new_basic().unwrap();
let _ = set
.delset(Privilege::ProcFork)
.expect("failed to delete from set");
let res = Command::new("ls").output();
assert!(res.is_ok(), "successfully ran ls");
setppriv(PrivOp::Set, PrivPtype::Effective, &set).unwrap();
let res = Command::new("ls").output();
assert!(res.is_err(), "can no longer run ls");
let err = res.unwrap_err();
assert_eq!(
std::io::ErrorKind::PermissionDenied,
err.kind(),
"got permission denied when attempting to run ls"
);
setppriv(PrivOp::Set, PrivPtype::Effective, &orig).unwrap();
}
}