Save files in local storage as umask (#21198)

Go creates temporary files as 600, but sometimes we want the group to be able to read them (for example,
for another user to back up the storage)

This PR applies the umask to the renamed tmp files in local storage.

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
This commit is contained in:
Nulo (he/him) 2022-09-24 13:04:14 +00:00 committed by GitHub
parent 83680c97a7
commit cca189ef97
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4 changed files with 84 additions and 0 deletions

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@ -102,6 +102,10 @@ func (l *LocalStorage) Save(path string, r io.Reader, size int64) (int64, error)
if err := util.Rename(tmp.Name(), p); err != nil {
return 0, err
}
// Golang's tmp file (os.CreateTemp) always have 0o600 mode, so we need to change the file to follow the umask (as what Create/MkDir does)
if err := util.ApplyUmask(p, os.ModePerm); err != nil {
return 0, err
}
tmpRemoved = true

28
modules/util/file_unix.go Normal file
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@ -0,0 +1,28 @@
// Copyright 2022 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
//go:build !windows
package util
import (
"os"
"golang.org/x/sys/unix"
)
var defaultUmask int
func init() {
// at the moment, the umask could only be gotten by calling unix.Umask(newUmask)
// use 0o077 as temp new umask to reduce the risks if this umask is used anywhere else before the correct umask is recovered
tempUmask := 0o077
defaultUmask = unix.Umask(tempUmask)
unix.Umask(defaultUmask)
}
func ApplyUmask(f string, newMode os.FileMode) error {
mod := newMode & ^os.FileMode(defaultUmask)
return os.Chmod(f, mod)
}

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@ -0,0 +1,36 @@
// Copyright 2022 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
//go:build !windows
package util
import (
"os"
"testing"
"github.com/stretchr/testify/assert"
)
func TestApplyUmask(t *testing.T) {
f, err := os.CreateTemp(t.TempDir(), "test-filemode-")
assert.NoError(t, err)
err = os.Chmod(f.Name(), 0o777)
assert.NoError(t, err)
st, err := os.Stat(f.Name())
assert.NoError(t, err)
assert.EqualValues(t, 0o777, st.Mode().Perm()&0o777)
oldDefaultUmask := defaultUmask
defaultUmask = 0o037
defer func() {
defaultUmask = oldDefaultUmask
}()
err = ApplyUmask(f.Name(), os.ModePerm)
assert.NoError(t, err)
st, err = os.Stat(f.Name())
assert.NoError(t, err)
assert.EqualValues(t, 0o740, st.Mode().Perm()&0o777)
}

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@ -0,0 +1,16 @@
// Copyright 2022 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
//go:build windows
package util
import (
"os"
)
func ApplyUmask(f string, newMode os.FileMode) error {
// do nothing for Windows, because Windows doesn't use umask
return nil
}