add bad_attrs.py

1 files changed, 133 insertions, 0 deletions

diff --git a/bad_attrs.py b/bad_attrs.py
new file mode 100755
index 0000000..fc1f4d8
--- /dev/null
+++ b/bad_attrs.py
@@ -0,0 +1,133 @@
+#!/usr/bin/env python3
+
+# Copyright (c) 2023 Egor Tensin <Egor.Tensin@gmail.com>
+# This file is part of the "audit-scripts" project.
+# For details, see https://github.com/egor-tensin/audit-scripts.
+# Distributed under the MIT License.
+
+import argparse
+import array
+from contextlib import contextmanager
+import errno
+import fcntl
+import logging
+import os
+import stat
+import sys
+
+
+@contextmanager
+def setup_logging():
+    logging.basicConfig(
+        format='%(asctime)s | %(levelname)s | %(message)s',
+        datefmt='%Y-%m-%d %H:%M:%S',
+        level=logging.DEBUG)
+    try:
+        yield
+    except Exception as e:
+        logging.exception(e)
+        raise
+
+
+def scandir(dir_path):
+    try:
+        entry_it = os.scandir(dir_path)
+    except (PermissionError, FileNotFoundError) as e:
+        logging.warning('%s', e)
+        return
+    with entry_it:
+        yield from entry_it
+
+
+def traverse_tree(root):
+    queue = [root]
+    while queue:
+        for entry in scandir(queue.pop(0)):
+            if entry.is_dir(follow_symlinks=False):
+                if os.path.ismount(entry.path):
+                    continue
+                queue.append(entry.path)
+            yield entry
+
+
+def skip_leaf(entry):
+    if entry.is_dir(follow_symlinks=False):
+        return False
+    if entry.is_file(follow_symlinks=False):
+        return False
+    return True
+
+
+@contextmanager
+def low_level_open(path, flags):
+    fd = os.open(path, flags)
+    try:
+        yield fd
+    finally:
+        os.close(fd)
+
+
+FS_IOC_GETFLAGS = 0x80086601
+
+FS_IMMUTABLE_FL = 0x00000010
+FS_APPEND_FL    = 0x00000020
+
+BAD_FLAGS = [FS_IMMUTABLE_FL, FS_APPEND_FL]
+
+
+def flags_contain_bad_flags(flags):
+    return any([flags & bad_flag for bad_flag in BAD_FLAGS])
+
+
+def fd_get_flags(fd):
+    a = array.array('L', [0])
+    fcntl.ioctl(fd, FS_IOC_GETFLAGS, a, True)
+    return a[0]
+
+
+def path_get_flags(path):
+    with low_level_open(path, os.O_RDONLY) as fd:
+        return fd_get_flags(fd)
+
+
+def path_has_bad_flags(path):
+    try:
+        flags = path_get_flags(path)
+    except OSError as e:
+        if e.errno == errno.ENOTTY or e.errno == errno.EPERM:
+            # Either one of:
+            #     Inappropriate ioctl for device
+            #     Permission denied
+            logging.warning('%s: %s', path, e)
+            return False
+        raise
+    return flags_contain_bad_flags(flags)
+
+
+def do_dir(root):
+    logging.info('Directory: %s', root)
+    for entry in traverse_tree(root):
+        if skip_leaf(entry):
+            continue
+        #logging.debug('Path: %s', entry.path)
+        if path_has_bad_flags(entry.path):
+            logging.warning('Bad flags: %s', entry.path)
+
+
+def parse_args(argv=None):
+    if argv is None:
+        argv = sys.argv[1:]
+    parser = argparse.ArgumentParser()
+    parser.add_argument('dir', metavar='DIR',
+                        help='set root directory')
+    return parser.parse_args()
+
+
+def main(argv=None):
+    with setup_logging():
+        args = parse_args()
+        do_dir(args.dir)
+
+
+if __name__ == '__main__':
+    main()