security_context_others.go

Documentation: k8s.io/kubernetes/pkg/kubelet/kuberuntime

     1  //go:build !windows
     2  // +build !windows
     3  
     4  /*
     5  Copyright 2020 The Kubernetes Authors.
     6  
     7  Licensed under the Apache License, Version 2.0 (the "License");
     8  you may not use this file except in compliance with the License.
     9  You may obtain a copy of the License at
    10  
    11      http://www.apache.org/licenses/LICENSE-2.0
    12  
    13  Unless required by applicable law or agreed to in writing, software
    14  distributed under the License is distributed on an "AS IS" BASIS,
    15  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    16  See the License for the specific language governing permissions and
    17  limitations under the License.
    18  */
    19  
    20  package kuberuntime
    21  
    22  import (
    23  	"fmt"
    24  
    25  	"k8s.io/api/core/v1"
    26  	"k8s.io/kubernetes/pkg/kubelet/util/format"
    27  	"k8s.io/kubernetes/pkg/securitycontext"
    28  )
    29  
    30  // verifyRunAsNonRoot verifies RunAsNonRoot.
    31  func verifyRunAsNonRoot(pod *v1.Pod, container *v1.Container, uid *int64, username string) error {
    32  	effectiveSc := securitycontext.DetermineEffectiveSecurityContext(pod, container)
    33  	// If the option is not set, or if running as root is allowed, return nil.
    34  	if effectiveSc == nil || effectiveSc.RunAsNonRoot == nil || !*effectiveSc.RunAsNonRoot {
    35  		return nil
    36  	}
    37  
    38  	if effectiveSc.RunAsUser != nil {
    39  		if *effectiveSc.RunAsUser == 0 {
    40  			return fmt.Errorf("container's runAsUser breaks non-root policy (pod: %q, container: %s)", format.Pod(pod), container.Name)
    41  		}
    42  		return nil
    43  	}
    44  
    45  	switch {
    46  	case uid != nil && *uid == 0:
    47  		return fmt.Errorf("container has runAsNonRoot and image will run as root (pod: %q, container: %s)", format.Pod(pod), container.Name)
    48  	case uid == nil && len(username) > 0:
    49  		return fmt.Errorf("container has runAsNonRoot and image has non-numeric user (%s), cannot verify user is non-root (pod: %q, container: %s)", username, format.Pod(pod), container.Name)
    50  	default:
    51  		return nil
    52  	}
    53  }
    54
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