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//! This defines `rmdir`, the primary entrypoint to sandboxed file removal.
use crate::fs::rmdir_impl;
#[cfg(racy_asserts)]
use crate::fs::{manually, map_result, rmdir_unchecked, stat_unchecked, FollowSymlinks, Metadata};
use std::{fs, io, path::Path};
/// Perform a `rmdirat`-like operation, ensuring that the resolution of the path
/// never escapes the directory tree rooted at `start`.
#[cfg_attr(not(racy_asserts), allow(clippy::let_and_return))]
#[inline]
pub fn rmdir(start: &fs::File, path: &Path) -> io::Result<()> {
#[cfg(racy_asserts)]
let stat_before = stat_unchecked(start, path, FollowSymlinks::No);
// Call the underlying implementation.
let result = rmdir_impl(start, path);
#[cfg(racy_asserts)]
let stat_after = stat_unchecked(start, path, FollowSymlinks::No);
#[cfg(racy_asserts)]
check_rmdir(start, path, &stat_before, &result, &stat_after);
result
}
#[cfg(racy_asserts)]
#[allow(clippy::enum_glob_use)]
fn check_rmdir(
start: &fs::File,
path: &Path,
stat_before: &io::Result<Metadata>,
result: &io::Result<()>,
stat_after: &io::Result<Metadata>,
) {
use io::ErrorKind::*;
match (
map_result(stat_before),
map_result(result),
map_result(stat_after),
) {
(Ok(metadata), Ok(()), Err((NotFound, _))) => {
// TODO: Check that the path was inside the sandbox.
assert!(metadata.is_dir());
}
(Err((Other, _)), Ok(()), Err((NotFound, _))) => {
// TODO: Check that the path was inside the sandbox.
}
(_, Err((InvalidInput, _)), _) => {
// `rmdir(".")` apparently returns `EINVAL`
}
(_, Err((kind, message)), _) => {
match map_result(&manually::canonicalize_with(
start,
path,
FollowSymlinks::No,
)) {
Ok(canon) => match map_result(&rmdir_unchecked(start, &canon)) {
Err((_unchecked_kind, _unchecked_message)) => {
/* TODO: Check error messages.
assert_eq!(
kind,
unchecked_kind,
"unexpected error kind from rmdir start='{:?}', \
path='{}':\nstat_before={:#?}\nresult={:#?}\nstat_after={:#?}",
start,
path.display(),
stat_before,
result,
stat_after
);
assert_eq!(message, unchecked_message);
*/
}
_ => panic!(
"unsandboxed rmdir success on start={:?} path={:?}; expected {:?}: {}",
start, path, kind, message
),
},
Err((_canon_kind, _canon_message)) => {
/* TODO: Check error messages.
assert_eq!(kind, canon_kind, "'{}' vs '{}'", message, canon_message);
assert_eq!(message, canon_message);
*/
}
}
}
other => panic!(
"inconsistent rmdir checks: start='{:?}' path='{}':\n{:#?}",
start,
path.display(),
other,
),
}
match stat_after {
Ok(_unchecked_metadata) => match &result {
Ok(()) => panic!(
"file still exists after rmdir start='{:?}', path='{}'",
start,
path.display()
),
Err(e) => match e.kind() {
io::ErrorKind::PermissionDenied
| io::ErrorKind::InvalidInput // `rmdir(".")` apparently returns `EINVAL`
| io::ErrorKind::Other => (), // directory not empty, among other things
_ => panic!(
"unexpected error rmdiring start='{:?}', path='{}': {:?}",
start,
path.display(),
e
),
},
},
Err(_unchecked_error) => match &result {
Ok(()) => (),
Err(result_error) => match result_error.kind() {
io::ErrorKind::PermissionDenied => (),
_ => {
/* TODO: Check error messages.
assert_eq!(result_error.to_string(), unchecked_error.to_string());
assert_eq!(result_error.kind(), unchecked_error.kind());
*/
}
},
},
}
}