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110 lines
3.2 KiB
Go
110 lines
3.2 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package apparmor
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import (
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"errors"
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"fmt"
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"strings"
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"github.com/opencontainers/runc/libcontainer/apparmor"
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v1 "k8s.io/api/core/v1"
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utilfeature "k8s.io/apiserver/pkg/util/feature"
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podutil "k8s.io/kubernetes/pkg/api/v1/pod"
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"k8s.io/kubernetes/pkg/apis/core/validation"
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"k8s.io/kubernetes/pkg/features"
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)
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// Whether AppArmor should be disabled by default.
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// Set to true if the wrong build tags are set (see validate_disabled.go).
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var isDisabledBuild bool
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// Validator is a interface for validating that a pod with an AppArmor profile can be run by a Node.
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type Validator interface {
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Validate(pod *v1.Pod) error
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ValidateHost() error
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}
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// NewValidator is in order to find AppArmor FS
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func NewValidator() Validator {
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if err := validateHost(); err != nil {
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return &validator{validateHostErr: err}
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}
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return &validator{}
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}
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type validator struct {
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validateHostErr error
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}
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func (v *validator) Validate(pod *v1.Pod) error {
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if !isRequired(pod) {
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return nil
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}
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if v.ValidateHost() != nil {
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return v.validateHostErr
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}
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var retErr error
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podutil.VisitContainers(&pod.Spec, podutil.AllContainers, func(container *v1.Container, containerType podutil.ContainerType) bool {
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profile := GetProfileName(pod, container.Name)
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retErr = validation.ValidateAppArmorProfileFormat(profile)
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if retErr != nil {
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return false
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}
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// TODO(#64841): This would ideally be part of validation.ValidateAppArmorProfileFormat, but
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// that is called for API validation, and this is tightening validation.
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if strings.HasPrefix(profile, v1.AppArmorBetaProfileNamePrefix) {
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if strings.TrimSpace(strings.TrimPrefix(profile, v1.AppArmorBetaProfileNamePrefix)) == "" {
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retErr = fmt.Errorf("invalid empty AppArmor profile name: %q", profile)
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return false
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}
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}
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return true
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})
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return retErr
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}
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// ValidateHost verifies that the host and runtime is capable of enforcing AppArmor profiles.
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// Note, this is intentionally only check the host at kubelet startup and never re-evaluates the host
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// as the expectation is that the kubelet restart will be needed to enable or disable AppArmor support.
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func (v *validator) ValidateHost() error {
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return v.validateHostErr
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}
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// validateHost verifies that the host and runtime is capable of enforcing AppArmor profiles.
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func validateHost() error {
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// Check feature-gates
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if !utilfeature.DefaultFeatureGate.Enabled(features.AppArmor) {
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return errors.New("AppArmor disabled by feature-gate")
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}
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// Check build support.
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if isDisabledBuild {
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return errors.New("binary not compiled for linux")
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}
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// Check kernel support.
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if !apparmor.IsEnabled() {
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return errors.New("AppArmor is not enabled on the host")
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}
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return nil
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}
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