/usr/lib/python3/dist-packages/radicale/pathutils.py is in python3-radicale 1.1.1+20160115-4.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 | # -*- coding: utf-8 -*-
#
# This file is part of Radicale Server - Calendar Server
#
# This library is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Radicale. If not, see <http://www.gnu.org/licenses/>.
"""
Helper functions for working with paths.
"""
import os
import posixpath
from . import log
def sanitize_path(path):
"""Make path absolute with leading slash to prevent access to other data.
Preserve a potential trailing slash.
"""
trailing_slash = "/" if path.endswith("/") else ""
path = posixpath.normpath(path)
new_path = "/"
for part in path.split("/"):
if not part or part in (".", ".."):
continue
new_path = posixpath.join(new_path, part)
trailing_slash = "" if new_path.endswith("/") else trailing_slash
return new_path + trailing_slash
def is_safe_path_component(path):
"""Check if path is a single component of a POSIX path.
Check that the path is safe to join too.
"""
if not path:
return False
head, _ = posixpath.split(path)
if head:
return False
if path in (".", ".."):
return False
return True
def is_safe_filesystem_path_component(path):
"""Check if path is a single component of a filesystem path.
Check that the path is safe to join too.
"""
if not path:
return False
drive, _ = os.path.splitdrive(path)
if drive:
return False
head, _ = os.path.split(path)
if head:
return False
if path in (os.curdir, os.pardir):
return False
return True
def path_to_filesystem(path, base_folder):
"""Convert path to a local filesystem path relative to base_folder.
Conversion is done in a secure manner, or raises ValueError.
"""
sane_path = sanitize_path(path).strip("/")
safe_path = base_folder
if not sane_path:
return safe_path
for part in sane_path.split("/"):
if not is_safe_filesystem_path_component(part):
log.LOGGER.debug(
"Can't translate path safely to filesystem: %s", path)
raise ValueError("Unsafe path")
safe_path = os.path.join(safe_path, part)
return safe_path
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