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mustrunas.go
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mustrunas.go
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package selinux
import (
"fmt"
"sort"
"strings"
"k8s.io/apimachinery/pkg/util/validation/field"
api "k8s.io/kubernetes/pkg/apis/core"
securityapi "github.com/openshift/origin/pkg/security/apis/security"
"github.com/openshift/origin/pkg/security/securitycontextconstraints/util"
)
type mustRunAs struct {
opts *securityapi.SELinuxContextStrategyOptions
}
var _ SELinuxSecurityContextConstraintsStrategy = &mustRunAs{}
func NewMustRunAs(options *securityapi.SELinuxContextStrategyOptions) (SELinuxSecurityContextConstraintsStrategy, error) {
if options == nil {
return nil, fmt.Errorf("MustRunAs requires SELinuxContextStrategyOptions")
}
if options.SELinuxOptions == nil {
return nil, fmt.Errorf("MustRunAs requires SELinuxOptions")
}
return &mustRunAs{
opts: options,
}, nil
}
// Generate creates the SELinuxOptions based on constraint rules.
func (s *mustRunAs) Generate(_ *api.Pod, _ *api.Container) (*api.SELinuxOptions, error) {
return s.opts.SELinuxOptions, nil
}
// Validate ensures that the specified values fall within the range of the strategy.
func (s *mustRunAs) Validate(fldPath *field.Path, _ *api.Pod, _ *api.Container, seLinux *api.SELinuxOptions) field.ErrorList {
allErrs := field.ErrorList{}
if seLinux == nil {
allErrs = append(allErrs, field.Required(fldPath, ""))
return allErrs
}
if !equalLevels(s.opts.SELinuxOptions.Level, seLinux.Level) {
detail := fmt.Sprintf("must be %s", s.opts.SELinuxOptions.Level)
allErrs = append(allErrs, field.Invalid(fldPath.Child("level"), seLinux.Level, detail))
}
if seLinux.Role != s.opts.SELinuxOptions.Role {
detail := fmt.Sprintf("must be %s", s.opts.SELinuxOptions.Role)
allErrs = append(allErrs, field.Invalid(fldPath.Child("role"), seLinux.Role, detail))
}
if seLinux.Type != s.opts.SELinuxOptions.Type {
detail := fmt.Sprintf("must be %s", s.opts.SELinuxOptions.Type)
allErrs = append(allErrs, field.Invalid(fldPath.Child("type"), seLinux.Type, detail))
}
if seLinux.User != s.opts.SELinuxOptions.User {
detail := fmt.Sprintf("must be %s", s.opts.SELinuxOptions.User)
allErrs = append(allErrs, field.Invalid(fldPath.Child("user"), seLinux.User, detail))
}
return allErrs
}
// equalLevels compares SELinux levels for equality.
func equalLevels(expected, actual string) bool {
if expected == actual {
return true
}
// "s0:c6,c0" => [ "s0", "c6,c0" ]
expectedParts := strings.SplitN(expected, ":", 2)
actualParts := strings.SplitN(actual, ":", 2)
// both SELinux levels must be in a format "sX:cY"
if len(expectedParts) != 2 || len(actualParts) != 2 {
return false
}
if !equalSensitivity(expectedParts[0], actualParts[0]) {
return false
}
if !equalCategories(expectedParts[1], actualParts[1]) {
return false
}
return true
}
// equalSensitivity compares sensitivities of the SELinux levels for equality.
func equalSensitivity(expected, actual string) bool {
return expected == actual
}
// equalCategories compares categories of the SELinux levels for equality.
func equalCategories(expected, actual string) bool {
expectedCategories := strings.Split(expected, ",")
actualCategories := strings.Split(actual, ",")
sort.Strings(expectedCategories)
sort.Strings(actualCategories)
return util.EqualStringSlices(expectedCategories, actualCategories)
}