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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2020 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 apparmor
import (
"fmt"
"os"
"path/filepath"
"strings"
"github.com/snapcore/snapd/osutil"
)
func labelFromPid(pid int) (string, error) {
// first check new kernel path, /proc/<pid>/attr/apparmor/current, falling
// back to the old path if that doesn't exist
procFile := filepath.Join(rootPath, fmt.Sprintf("proc/%v/attr/apparmor/current", pid))
if !osutil.FileExists(procFile) {
// fallback
procFile = filepath.Join(rootPath, fmt.Sprintf("proc/%v/attr/current", pid))
}
contents, err := os.ReadFile(procFile)
if os.IsNotExist(err) {
return "unconfined", nil
} else if err != nil {
return "", err
}
label := strings.TrimRight(string(contents), "\n")
// Trim off the mode
if strings.HasSuffix(label, ")") {
if pos := strings.LastIndex(label, " ("); pos != -1 {
label = label[:pos]
}
}
return label, nil
}
func DecodeLabel(label string) (snap, app, hook string, err error) {
parts := strings.Split(label, ".")
if parts[0] != "snap" {
return "", "", "", fmt.Errorf("security label %q does not belong to a snap", label)
}
if len(parts) == 3 {
return parts[1], parts[2], "", nil
}
if len(parts) == 4 && parts[2] == "hook" {
return parts[1], "", parts[3], nil
}
return "", "", "", fmt.Errorf("unknown snap related security label %q", label)
}
func SnapAppFromPid(pid int) (snap, app, hook string, err error) {
label, err := labelFromPid(pid)
if err != nil {
return "", "", "", err
}
return DecodeLabel(label)
}
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