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// path_auditor.rs
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//
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// Copyright 2020
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// Raphaël Gomès <rgomes@octobus.net>,
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//
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// This software may be used and distributed according to the terms of the
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// GNU General Public License version 2 or any later version.
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use crate::utils::{
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files::lower_clean,
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find_slice_in_slice,
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hg_path::{hg_path_to_path_buf, HgPath, HgPathBuf, HgPathError},
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};
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use std::collections::HashSet;
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use std::path::{Path, PathBuf};
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use std::sync::{Mutex, RwLock};
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/// Ensures that a path is valid for use in the repository i.e. does not use
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/// any banned components, does not traverse a symlink, etc.
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#[derive(Debug, Default)]
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pub struct PathAuditor {
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audited: Mutex<HashSet<HgPathBuf>>,
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audited_dirs: RwLock<HashSet<HgPathBuf>>,
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root: PathBuf,
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}
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impl PathAuditor {
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pub fn new(root: impl AsRef<Path>) -> Self {
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Self {
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root: root.as_ref().to_owned(),
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..Default::default()
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}
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}
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pub fn audit_path(
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&self,
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path: impl AsRef<HgPath>,
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) -> Result<(), HgPathError> {
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// TODO windows "localpath" normalization
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let path = path.as_ref();
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if path.is_empty() {
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return Ok(());
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}
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// TODO case normalization
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if self.audited.lock().unwrap().contains(path) {
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return Ok(());
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}
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// AIX ignores "/" at end of path, others raise EISDIR.
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let last_byte = path.as_bytes()[path.len() - 1];
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if last_byte == b'/' || last_byte == b'\\' {
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return Err(HgPathError::EndsWithSlash(path.to_owned()));
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}
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let parts: Vec<_> = path
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.as_bytes()
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.split(|b| std::path::is_separator(*b as char))
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.collect();
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let first_component = lower_clean(parts[0]);
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let first_component = first_component.as_slice();
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if !path.split_drive().0.is_empty()
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|| (first_component == b".hg"
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|| first_component == b".hg."
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|| first_component == b"")
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|| parts.iter().any(|c| c == b"..")
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{
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return Err(HgPathError::InsideDotHg(path.to_owned()));
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}
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// Windows shortname aliases
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for part in parts.iter() {
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if part.contains(&b'~') {
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let mut split = part.splitn(2, |b| *b == b'~');
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let first =
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split.next().unwrap().to_owned().to_ascii_uppercase();
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let last = split.next().unwrap();
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if last.iter().all(u8::is_ascii_digit)
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&& (first == b"HG" || first == b"HG8B6C")
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{
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return Err(HgPathError::ContainsIllegalComponent(
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path.to_owned(),
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));
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}
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}
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}
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let lower_path = lower_clean(path.as_bytes());
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if find_slice_in_slice(&lower_path, b".hg").is_some() {
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let lower_parts: Vec<_> = path
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.as_bytes()
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.split(|b| std::path::is_separator(*b as char))
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.collect();
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for pattern in [b".hg".to_vec(), b".hg.".to_vec()].iter() {
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if let Some(pos) = lower_parts[1..]
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.iter()
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.position(|part| part == &pattern.as_slice())
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{
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let base = lower_parts[..=pos]
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.iter()
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.fold(HgPathBuf::new(), |acc, p| {
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acc.join(HgPath::new(p))
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});
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return Err(HgPathError::IsInsideNestedRepo {
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path: path.to_owned(),
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nested_repo: base,
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});
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}
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}
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}
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let parts = &parts[..parts.len().saturating_sub(1)];
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// We don't want to add "foo/bar/baz" to `audited_dirs` before checking
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// if there's a "foo/.hg" directory. This also means we won't
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// accidentally traverse a symlink into some other filesystem (which
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// is potentially expensive to access).
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for index in 0..parts.len() {
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let prefix = &parts[..=index].join(&b'/');
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let prefix = HgPath::new(prefix);
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if self.audited_dirs.read().unwrap().contains(prefix) {
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continue;
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}
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self.check_filesystem(prefix, path)?;
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self.audited_dirs.write().unwrap().insert(prefix.to_owned());
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}
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self.audited.lock().unwrap().insert(path.to_owned());
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Ok(())
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}
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pub fn check_filesystem(
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&self,
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prefix: impl AsRef<HgPath>,
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path: impl AsRef<HgPath>,
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) -> Result<(), HgPathError> {
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let prefix = prefix.as_ref();
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let path = path.as_ref();
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let current_path = self.root.join(
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hg_path_to_path_buf(prefix)
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.map_err(|_| HgPathError::NotFsCompliant(path.to_owned()))?,
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);
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match std::fs::symlink_metadata(¤t_path) {
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Err(e) => {
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// EINVAL can be raised as invalid path syntax under win32.
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if e.kind() != std::io::ErrorKind::NotFound
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&& e.kind() != std::io::ErrorKind::InvalidInput
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&& e.raw_os_error() != Some(20)
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{
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// Rust does not yet have an `ErrorKind` for
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// `NotADirectory` (errno 20)
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// It happens if the dirstate contains `foo/bar` and
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// foo is not a directory
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return Err(HgPathError::NotFsCompliant(path.to_owned()));
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}
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}
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Ok(meta) => {
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if meta.file_type().is_symlink() {
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return Err(HgPathError::TraversesSymbolicLink {
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path: path.to_owned(),
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symlink: prefix.to_owned(),
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});
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}
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if meta.file_type().is_dir()
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&& current_path.join(".hg").is_dir()
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{
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return Err(HgPathError::IsInsideNestedRepo {
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path: path.to_owned(),
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nested_repo: prefix.to_owned(),
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});
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}
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}
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};
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Ok(())
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}
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pub fn check(&self, path: impl AsRef<HgPath>) -> bool {
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self.audit_path(path).is_ok()
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use std::fs::{create_dir, File};
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use tempfile::tempdir;
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#[test]
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fn test_path_auditor() {
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let base_dir = tempdir().unwrap();
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let base_dir_path = base_dir.path();
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let auditor = PathAuditor::new(base_dir_path);
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let path = HgPath::new(b".hg/00changelog.i");
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assert_eq!(
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auditor.audit_path(path),
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Err(HgPathError::InsideDotHg(path.to_owned()))
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);
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let path = HgPath::new(b"this/is/nested/.hg/thing.txt");
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assert_eq!(
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auditor.audit_path(path),
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Err(HgPathError::IsInsideNestedRepo {
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path: path.to_owned(),
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nested_repo: HgPathBuf::from_bytes(b"this/is/nested")
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})
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);
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create_dir(base_dir_path.join("realdir")).unwrap();
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File::create(base_dir_path.join("realdir/realfile")).unwrap();
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// TODO make portable
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std::os::unix::fs::symlink(
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base_dir_path.join("realdir"),
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base_dir_path.join("symlink"),
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)
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.unwrap();
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let path = HgPath::new(b"symlink/realfile");
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assert_eq!(
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auditor.audit_path(path),
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Err(HgPathError::TraversesSymbolicLink {
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path: path.to_owned(),
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symlink: HgPathBuf::from_bytes(b"symlink"),
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})
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);
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}
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}
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