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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 randutil_test
import (
"encoding/base64"
"os"
"path/filepath"
. "gopkg.in/check.v1"
"github.com/snapcore/snapd/randutil"
)
type cryptoRandutilSuite struct{}
var _ = Suite(&cryptoRandutilSuite{})
func (s *cryptoRandutilSuite) TestCryptoTokenBytes(c *C) {
x, err := randutil.CryptoTokenBytes(5)
c.Assert(err, IsNil)
c.Check(x, HasLen, 5)
}
func (s *cryptoRandutilSuite) TestCryptoToken(c *C) {
x, err := randutil.CryptoToken(5)
c.Assert(err, IsNil)
b, err := base64.RawURLEncoding.DecodeString(x)
c.Assert(err, IsNil)
c.Check(b, HasLen, 5)
}
var (
kernelTestUUID = "1031319a-b661-4c01-aafa-6def8a118944"
)
func (s *cryptoRandutilSuite) TestRandomKernelUUIDNoFile(c *C) {
uuidPath := filepath.Join(c.MkDir(), "no-file")
defer randutil.MockKernelUUIDPath(uuidPath)()
value, err := randutil.RandomKernelUUID()
c.Check(value, Equals, "")
c.Check(err, ErrorMatches,
"cannot read kernel generated uuid:"+
".*no-file: no such file or directory")
}
func (s *cryptoRandutilSuite) TestRandomKernelUUIDNoPerm(c *C) {
if os.Getuid() == 0 {
c.Skip("Permission tests will not work when user is root")
}
uuidPath := filepath.Join(c.MkDir(), "no-perm")
defer randutil.MockKernelUUIDPath(uuidPath)()
err := os.WriteFile(uuidPath, []byte(kernelTestUUID), 0)
c.Assert(err, IsNil)
value, err := randutil.RandomKernelUUID()
c.Check(value, Equals, "")
c.Assert(err, ErrorMatches,
"cannot read kernel generated uuid:"+
".*no-perm: permission denied")
}
func (s *cryptoRandutilSuite) TestRandomKernelUUID(c *C) {
for _, uuid := range []string{
kernelTestUUID,
" \t\n " + kernelTestUUID + " \n\t\r\n",
} {
// Create new path on each iteration because we cannot
// reuse previous path to read-only (0444) file.
uuidPath := filepath.Join(c.MkDir(), "uuid")
defer randutil.MockKernelUUIDPath(uuidPath)()
err := os.WriteFile(uuidPath, []byte(uuid), 0444)
c.Assert(err, IsNil)
value, err := randutil.RandomKernelUUID()
c.Check(value, Equals, kernelTestUUID)
c.Assert(err, IsNil)
}
}
func (s *cryptoRandutilSuite) TestRandomKernelUUIDReal(c *C) {
if _, err := os.Stat(randutil.KernelUUIDPath); err != nil {
c.Skip("Kernel UUID procfs file is not accessible in the current test environment")
}
value, err := randutil.RandomKernelUUID()
c.Check(value, Not(Equals), "")
// https://www.rfc-editor.org/rfc/rfc4122#section-3
// We are not testing the kernel here, so minimal check:
// UUID should be 36 bytes in length exactly.
c.Check(value, HasLen, 36)
c.Assert(err, IsNil)
}
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