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AppArmor PodSecurityPolicy implementation
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,110 @@ | ||
| /* | ||
| Copyright 2016 The Kubernetes 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 apparmor | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "strings" | ||
|
|
||
| "k8s.io/kubernetes/pkg/api" | ||
| "k8s.io/kubernetes/pkg/security/apparmor" | ||
| "k8s.io/kubernetes/pkg/util/maps" | ||
| "k8s.io/kubernetes/pkg/util/validation/field" | ||
| ) | ||
|
|
||
| // Strategy defines the interface for all AppArmor constraint strategies. | ||
| type Strategy interface { | ||
| // Generate updates the annotations based on constraint rules. The updates are applied to a copy | ||
| // of the annotations, and returned. | ||
| Generate(annotations map[string]string, container *api.Container) (map[string]string, error) | ||
| // Validate ensures that the specified values fall within the range of the strategy. | ||
| Validate(pod *api.Pod, container *api.Container) field.ErrorList | ||
| } | ||
|
|
||
| type strategy struct { | ||
| defaultProfile string | ||
| allowedProfiles map[string]bool | ||
| // For printing error messages (preserves order). | ||
| allowedProfilesString string | ||
| } | ||
|
|
||
| var _ Strategy = &strategy{} | ||
|
|
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| // NewStrategy creates a new strategy that enforces AppArmor profile constraints. | ||
| func NewStrategy(pspAnnotations map[string]string) Strategy { | ||
| var allowedProfiles map[string]bool | ||
| if allowed, ok := pspAnnotations[apparmor.AllowedProfilesAnnotationKey]; ok { | ||
| profiles := strings.Split(allowed, ",") | ||
| allowedProfiles = make(map[string]bool, len(profiles)) | ||
| for _, p := range profiles { | ||
| allowedProfiles[p] = true | ||
| } | ||
| } | ||
| return &strategy{ | ||
| defaultProfile: pspAnnotations[apparmor.DefaultProfileAnnotationKey], | ||
| allowedProfiles: allowedProfiles, | ||
| allowedProfilesString: pspAnnotations[apparmor.AllowedProfilesAnnotationKey], | ||
| } | ||
| } | ||
|
|
||
| func (s *strategy) Generate(annotations map[string]string, container *api.Container) (map[string]string, error) { | ||
| copy := maps.CopySS(annotations) | ||
|
|
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| if annotations[apparmor.ContainerAnnotationKeyPrefix+container.Name] != "" { | ||
| // Profile already set, nothing to do. | ||
| return copy, nil | ||
| } | ||
|
|
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| if s.defaultProfile == "" { | ||
| // No default set. | ||
| return copy, nil | ||
| } | ||
|
|
||
| if copy == nil { | ||
| copy = map[string]string{} | ||
| } | ||
| // Add the default profile. | ||
| copy[apparmor.ContainerAnnotationKeyPrefix+container.Name] = s.defaultProfile | ||
|
|
||
| return copy, nil | ||
| } | ||
|
|
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| func (s *strategy) Validate(pod *api.Pod, container *api.Container) field.ErrorList { | ||
| if s.allowedProfiles == nil { | ||
| // Unrestricted: allow all. | ||
| return nil | ||
| } | ||
|
|
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| allErrs := field.ErrorList{} | ||
| fieldPath := field.NewPath("pod", "metadata", "annotations").Key(apparmor.ContainerAnnotationKeyPrefix + container.Name) | ||
|
|
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| profile := apparmor.GetProfileName(pod, container.Name) | ||
| if profile == "" { | ||
| if len(s.allowedProfiles) > 0 { | ||
| allErrs = append(allErrs, field.Forbidden(fieldPath, "AppArmor profile must be set")) | ||
| return allErrs | ||
| } | ||
| return nil | ||
| } | ||
|
|
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| if !s.allowedProfiles[profile] { | ||
| msg := fmt.Sprintf("%s is not an allowed profile. Allowed values: %q", profile, s.allowedProfilesString) | ||
| allErrs = append(allErrs, field.Forbidden(fieldPath, msg)) | ||
| } | ||
|
|
||
| return allErrs | ||
| } |
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