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85 lines
2.9 KiB
Go
85 lines
2.9 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 user
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import (
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"fmt"
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"k8s.io/kubernetes/pkg/api"
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"k8s.io/kubernetes/pkg/apis/extensions"
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psputil "k8s.io/kubernetes/pkg/security/podsecuritypolicy/util"
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"k8s.io/kubernetes/pkg/util/validation/field"
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)
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// mustRunAs implements the RunAsUserStrategy interface
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type mustRunAs struct {
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opts *extensions.RunAsUserStrategyOptions
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}
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// NewMustRunAs provides a strategy that requires the container to run as a specific UID in a range.
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func NewMustRunAs(options *extensions.RunAsUserStrategyOptions) (RunAsUserStrategy, error) {
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if options == nil {
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return nil, fmt.Errorf("MustRunAsRange requires run as user options")
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}
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if len(options.Ranges) == 0 {
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return nil, fmt.Errorf("MustRunAsRange requires at least one range")
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}
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return &mustRunAs{
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opts: options,
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}, nil
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}
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// Generate creates the uid based on policy rules. MustRunAs returns the first range's Min.
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func (s *mustRunAs) Generate(pod *api.Pod, container *api.Container) (*int64, error) {
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return &s.opts.Ranges[0].Min, nil
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}
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// Validate ensures that the specified values fall within the range of the strategy.
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func (s *mustRunAs) Validate(pod *api.Pod, container *api.Container) field.ErrorList {
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allErrs := field.ErrorList{}
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securityContextPath := field.NewPath("securityContext")
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if container.SecurityContext == nil {
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detail := fmt.Sprintf("unable to validate nil security context for container %s", container.Name)
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allErrs = append(allErrs, field.Invalid(securityContextPath, container.SecurityContext, detail))
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return allErrs
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}
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if container.SecurityContext.RunAsUser == nil {
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detail := fmt.Sprintf("unable to validate nil RunAsUser for container %s", container.Name)
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allErrs = append(allErrs, field.Invalid(securityContextPath.Child("runAsUser"), container.SecurityContext.RunAsUser, detail))
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return allErrs
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}
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if !s.isValidUID(*container.SecurityContext.RunAsUser) {
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detail := fmt.Sprintf("UID on container %s does not match required range. Found %d, allowed: %v",
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container.Name,
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*container.SecurityContext.RunAsUser,
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s.opts.Ranges)
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allErrs = append(allErrs, field.Invalid(securityContextPath.Child("runAsUser"), *container.SecurityContext.RunAsUser, detail))
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}
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return allErrs
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}
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func (s *mustRunAs) isValidUID(id int64) bool {
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for _, rng := range s.opts.Ranges {
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if psputil.FallsInRange(id, rng) {
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return true
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}
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}
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return false
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}
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