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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2024 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 fips
import (
"bytes"
"errors"
"io/fs"
"os"
"path/filepath"
"github.com/snapcore/snapd/dirs"
)
// IsEnabled returns true when the OS reports that FIPS mode is enabled.
// Otherwise returns false.
func IsEnabled() (bool, error) {
p := filepath.Join(dirs.GlobalRootDir, "/proc/sys/crypto/fips_enabled")
f, err := os.Open(p)
if err != nil {
if errors.Is(err, fs.ErrNotExist) {
return false, nil
}
return false, err
}
defer f.Close()
// see: https://elixir.bootlin.com/linux/v6.9.4/source/crypto/fips.c#L46
// the file content is '[0|1]\n'
var buf [2]byte
n, err := f.Read(buf[:])
if err != nil {
return false, err
}
return bytes.Equal(buf[:n], []byte("1\n")), nil
}
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