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selinux.go
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selinux.go
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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2018 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package selinux
import (
"bytes"
"fmt"
"io/ioutil"
"path/filepath"
"github.com/snapcore/snapd/osutil"
)
var (
procSelfMountInfo = osutil.ProcSelfMountInfo
)
// IsEnabled checks whether SELinux is enabled
func IsEnabled() (bool, error) {
mnt, err := getSELinuxMount()
if err != nil {
return false, fmt.Errorf("failed to obtain SELinux mount path: %v", err)
}
return mnt != "", nil
}
// IsEnabled checks whether SELinux is in enforcing mode
func IsEnforcing() (bool, error) {
mnt, err := getSELinuxMount()
if err != nil {
return false, fmt.Errorf("failed to obtain SELinux mount path: %v", err)
}
if mnt == "" {
// not enabled
return false, nil
}
rawState, err := ioutil.ReadFile(filepath.Join(mnt, "enforce"))
if err != nil {
return false, err
}
switch {
case bytes.Equal(rawState, []byte("0")):
return false, nil
case bytes.Equal(rawState, []byte("1")):
return true, nil
}
return false, fmt.Errorf("unknown SELinux status: %s", rawState)
}
func getSELinuxMount() (string, error) {
mountinfo, err := osutil.LoadMountInfo(procSelfMountInfo)
if err != nil {
return "", err
}
for _, entry := range mountinfo {
if entry.FsType == "selinuxfs" {
return entry.MountDir, nil
}
}
return "", nil
}