containerd/pkg/cri/server/helpers_selinux_linux_test.go

/*
   Copyright The containerd Authors.

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/

package server

import (
	"testing"

	"github.com/opencontainers/selinux/go-selinux"
	"github.com/stretchr/testify/assert"
	runtime "k8s.io/cri-api/pkg/apis/runtime/v1"
)

func TestInitSelinuxOpts(t *testing.T) {
	if !selinux.GetEnabled() {
		t.Skip("selinux is not enabled")
	}

	for desc, test := range map[string]struct {
		selinuxOpt   *runtime.SELinuxOption
		processLabel string
		mountLabel   string
		expectErr    bool
	}{
		"Should return empty strings for processLabel and mountLabel when selinuxOpt is nil": {
			selinuxOpt:   nil,
			processLabel: ".*:c[0-9]{1,3},c[0-9]{1,3}",
			mountLabel:   ".*:c[0-9]{1,3},c[0-9]{1,3}",
		},
		"Should overlay fields on processLabel when selinuxOpt has been initialized partially": {
			selinuxOpt: &runtime.SELinuxOption{
				User:  "",
				Role:  "user_r",
				Type:  "",
				Level: "s0:c1,c2",
			},
			processLabel: "system_u:user_r:(container_file_t|svirt_lxc_net_t):s0:c1,c2",
			mountLabel:   "system_u:object_r:(container_file_t|svirt_sandbox_file_t):s0:c1,c2",
		},
		"Should be resolved correctly when selinuxOpt has been initialized completely": {
			selinuxOpt: &runtime.SELinuxOption{
				User:  "user_u",
				Role:  "user_r",
				Type:  "user_t",
				Level: "s0:c1,c2",
			},
			processLabel: "user_u:user_r:user_t:s0:c1,c2",
			mountLabel:   "user_u:object_r:(container_file_t|svirt_sandbox_file_t):s0:c1,c2",
		},
		"Should be resolved correctly when selinuxOpt has been initialized with level=''": {
			selinuxOpt: &runtime.SELinuxOption{
				User:  "user_u",
				Role:  "user_r",
				Type:  "user_t",
				Level: "",
			},
			processLabel: "user_u:user_r:user_t:s0:c[0-9]{1,3},c[0-9]{1,3}",
			mountLabel:   "user_u:object_r:(container_file_t|svirt_sandbox_file_t):s0",
		},
		"Should return error when the format of 'level' is not correct": {
			selinuxOpt: &runtime.SELinuxOption{
				User:  "user_u",
				Role:  "user_r",
				Type:  "user_t",
				Level: "s0,c1,c2",
			},
			expectErr: true,
		},
	} {
		t.Run(desc, func(t *testing.T) {
			processLabel, mountLabel, err := initLabelsFromOpt(test.selinuxOpt)
			if test.expectErr {
				assert.Error(t, err)
			} else {
				assert.Regexp(t, test.processLabel, processLabel)
				assert.Regexp(t, test.mountLabel, mountLabel)
			}
		})
	}
}

func TestCheckSelinuxLevel(t *testing.T) {
	for desc, test := range map[string]struct {
		level         string
		expectNoMatch bool
	}{
		"s0": {
			level: "s0",
		},
		"s0-s0": {
			level: "s0-s0",
		},
		"s0:c0": {
			level: "s0:c0",
		},
		"s0:c0.c3": {
			level: "s0:c0.c3",
		},
		"s0:c0,c3": {
			level: "s0:c0,c3",
		},
		"s0-s0:c0,c3": {
			level: "s0-s0:c0,c3",
		},
		"s0-s0:c0,c3.c6": {
			level: "s0-s0:c0,c3.c6",
		},
		"s0-s0:c0,c3.c6,c8.c10": {
			level: "s0-s0:c0,c3.c6,c8.c10",
		},
		"s0-s0:c0,c3.c6,c8,c10": {
			level: "s0-s0:c0,c3.c6",
		},
		"s0,c0,c3": {
			level:         "s0,c0,c3",
			expectNoMatch: true,
		},
		"s0:c0.c3.c6": {
			level:         "s0:c0.c3.c6",
			expectNoMatch: true,
		},
		"s0-s0,c0,c3": {
			level:         "s0-s0,c0,c3",
			expectNoMatch: true,
		},
		"s0-s0:c0.c3.c6": {
			level:         "s0-s0:c0.c3.c6",
			expectNoMatch: true,
		},
		"s0-s0:c0,c3.c6.c8": {
			level:         "s0-s0:c0,c3.c6.c8",
			expectNoMatch: true,
		},
	} {
		t.Run(desc, func(t *testing.T) {
			err := checkSelinuxLevel(test.level)
			if test.expectNoMatch {
				assert.Error(t, err)
			} else {
				assert.NoError(t, err)
			}
		})
	}
}