forked from toolshed/abra
chore: make deps, go mod vendor
This commit is contained in:
27
vendor/github.com/cyphar/filepath-securejoin/join.go
generated
vendored
27
vendor/github.com/cyphar/filepath-securejoin/join.go
generated
vendored
@ -1,13 +1,8 @@
|
||||
// Copyright (C) 2014-2015 Docker Inc & Go Authors. All rights reserved.
|
||||
// Copyright (C) 2017 SUSE LLC. All rights reserved.
|
||||
// Copyright (C) 2017-2024 SUSE LLC. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// Package securejoin is an implementation of the hopefully-soon-to-be-included
|
||||
// SecureJoin helper that is meant to be part of the "path/filepath" package.
|
||||
// The purpose of this project is to provide a PoC implementation to make the
|
||||
// SecureJoin proposal (https://github.com/golang/go/issues/20126) more
|
||||
// tangible.
|
||||
package securejoin
|
||||
|
||||
import (
|
||||
@ -22,24 +17,30 @@ const maxSymlinkLimit = 255
|
||||
|
||||
// IsNotExist tells you if err is an error that implies that either the path
|
||||
// accessed does not exist (or path components don't exist). This is
|
||||
// effectively a more broad version of os.IsNotExist.
|
||||
// effectively a more broad version of [os.IsNotExist].
|
||||
func IsNotExist(err error) bool {
|
||||
// Check that it's not actually an ENOTDIR, which in some cases is a more
|
||||
// convoluted case of ENOENT (usually involving weird paths).
|
||||
return errors.Is(err, os.ErrNotExist) || errors.Is(err, syscall.ENOTDIR) || errors.Is(err, syscall.ENOENT)
|
||||
}
|
||||
|
||||
// SecureJoinVFS joins the two given path components (similar to Join) except
|
||||
// SecureJoinVFS joins the two given path components (similar to [filepath.Join]) except
|
||||
// that the returned path is guaranteed to be scoped inside the provided root
|
||||
// path (when evaluated). Any symbolic links in the path are evaluated with the
|
||||
// given root treated as the root of the filesystem, similar to a chroot. The
|
||||
// filesystem state is evaluated through the given VFS interface (if nil, the
|
||||
// standard os.* family of functions are used).
|
||||
// filesystem state is evaluated through the given [VFS] interface (if nil, the
|
||||
// standard [os].* family of functions are used).
|
||||
//
|
||||
// Note that the guarantees provided by this function only apply if the path
|
||||
// components in the returned string are not modified (in other words are not
|
||||
// replaced with symlinks on the filesystem) after this function has returned.
|
||||
// Such a symlink race is necessarily out-of-scope of SecureJoin.
|
||||
// Such a symlink race is necessarily out-of-scope of SecureJoinVFS.
|
||||
//
|
||||
// NOTE: Due to the above limitation, Linux users are strongly encouraged to
|
||||
// use [OpenInRoot] instead, which does safely protect against these kinds of
|
||||
// attacks. There is no way to solve this problem with SecureJoinVFS because
|
||||
// the API is fundamentally wrong (you cannot return a "safe" path string and
|
||||
// guarantee it won't be modified afterwards).
|
||||
//
|
||||
// Volume names in unsafePath are always discarded, regardless if they are
|
||||
// provided via direct input or when evaluating symlinks. Therefore:
|
||||
@ -117,8 +118,8 @@ func SecureJoinVFS(root, unsafePath string, vfs VFS) (string, error) {
|
||||
return filepath.Join(root, finalPath), nil
|
||||
}
|
||||
|
||||
// SecureJoin is a wrapper around SecureJoinVFS that just uses the os.* library
|
||||
// of functions as the VFS. If in doubt, use this function over SecureJoinVFS.
|
||||
// SecureJoin is a wrapper around [SecureJoinVFS] that just uses the [os].* library
|
||||
// of functions as the [VFS]. If in doubt, use this function over [SecureJoinVFS].
|
||||
func SecureJoin(root, unsafePath string) (string, error) {
|
||||
return SecureJoinVFS(root, unsafePath, nil)
|
||||
}
|
||||
|
Reference in New Issue
Block a user